Stainless steel cutting is machined
- source:TECHEN CNC Machining
1% ～ 0.
5%(amounts to 1%) sometimes, commonly 1Cr13, 2Cr13, 3Cr13, 4Cr13, 1Cr17Ni2, 9Cr18, 9Cr18MoV, 30Cr13Mo waits. Ferrite stainless steel: Contain chromium to measure 12% ～ 30% , commonly 0Cr13, 0Cr17Ti, 0Cr13Si4NbRE, 1Cr17, 1Cr17Ti, 1Cr17M02Ti, 1Cr25Ti, 1Cr28 waits. Austenite stainless steel: Contain subsidiary channels in the human body through which vital energy to measure 12% ～ 25% , contain nickel to measure 7% ～ 20%(or 20% above) , the most typical delegate is 1Cr18Ni9Ti, common still 00Cr18Ni10, 00Cr18Ni14Mo2Cu2, 0Cr18Ni12Mo2Ti, 0Cr18Ni18Mo2Cu2Ti, 0Cr23Ni28M03Cu3Ti, 1Cr14Mn14Ni, 2Cr13Mn9Ni4, 1Cr18Mn8Ni5N waits. Austenite + ferrite stainless steel: With likeness of austenite stainless steel, contain the ferrite of certain amount in the organization only, commonly 0Cr21Ni5Ti, 1Cr21Ni5Ti, 1Cr18Mn10Ni5M03N, 0Cr17Mn13Mo2N, 1Cr17Mn9Ni3M03Cu2N, Cr2bNi17M03CuSiN, 1Cr18Ni11Si4AlTi waits. Precipitation sclerosis stainless steel: Contain taller chromium, nickel and very low carbon, commonly 0Cr17Ni4Cu4Nb, 0Cr17Ni7Al, 0Cr15Ni7M02Al waits. Before two kinds are chromic stainless steel, hind stainless steel of 3 kinds of nickel that it is chromium. What physics, mechanical property do 3 stainless steel have? Martensite stainless steel: Can undertake quenching, taller hardness, intensity and wearability are had to reach after quenching fight oxidisability goodly, some has magnetism, but internal stress is great and fragile. Via its stress can be being eliminated after microtherm temper, raise plasticity, cutting treatment is more difficult, have the apparent tendency of the abrade that cut bits or felt, cutting tool is easy wear away. Carbon should be contained to measure in steel under 0.
3% when, the organization is inhomogenous, adhesiveness is strong, easy generation accumulates bits tumour when cutting, and the difficulty that break bits, workpiece already machined exterior quality low. The quantity that contain carbon is amounted to 0.
4% ～ 0.
5% when, cutting processability is better. After martensite stainless steel is handled character via tone, can acquire admirable integrated and mechanical property, its cutting processability has very big improvement than anneal condition. Ferrite stainless steel: Heat the organization when refrigeration is stable, do not happen to change, cause heat treatment cannot make its aggrandizement, can rely on to be out of shape only aggrandizement, function is more fragile, cutting processability is general better. Cut bits to show banding, cut bits easy abrade or felt go up at cutting blade, increase cutting power thereby, cutting temperature is elevatory, at the same time the likelihood makes workpiece surface generation tears off a phenomenon. Austenite stainless steel: Because contain more nickel (or manganese) , the organization when heating is changeless, reason quenchs cannot make its aggrandizement, can improve its processability slightly. Through cold working sclerosis can increase strength substantially, if again via ageing treatment, tensile strength can amount to 2550 ～ 2740 MPa. When cutting of austenite stainless steel banding cut bits continuous and ceaseless, break bits difficulty, extremely easy generation machines sclerosis, sclerotic layer gives the next time cutting brings very great difficulty, make cutting tool wears away quickly, cutting tool durability drops substantially. Austenite stainless steel has good mechanical performance, be able to bear or endure goodly corrode ability, more outstanding is cold be out of shape ability, without magnetism. Austenite + ferrite stainless steel: Have separate out of the compound between the metal with extremely tall hardness, intensity is higher than austenite stainless steel, its cutting processability is poorer. Precipitation sclerosis stainless steel: Contain the alloying element such as the thallium that can remove precipitation sclerosis, aluminous, molybdenum, titanium, they are when temper separate out of effectiveness for a given period of time, produce precipitation sclerosis, make steel has very high intensity and hardness. Because contain carbon the amount is small assured the sufficient capacity that contain chromium, because this has good corrosion resistance can. What cutting characteristic do 4 stainless steel have? The cutting processability of stainless steel is differred more than medium carbon steel. With common the cutting processability of 45 steel serves as 100% , the opposite cutting processability of 1Cr18Ni9Ti of austenite stainless steel is 40% ; 1Cr28 of ferrite stainless steel is 48% ; 2Cr13 of martensite stainless steel is 55% . Among them, with austenite and austenite + the cutting processability of ferrite stainless steel is the poorest. Stainless steel is like characteristic of below a few respects in cutting process: Treatment is sclerotic and serious: In stainless steel, with austenite and austenite + the treatment sclerosis phenomenon of ferrite stainless steel is most outstanding. If the intensity Sb after sclerosis of austenite stainless steel amounts to 1470 ～ 1960MPa, and follow Sb rise, succumb ultimate Ss is elevatory; The σ B30% ～ that Ss does not exceed the austenite stainless steel of anneal condition 45% , and 85% ～ are amounted to after treatment is sclerotic 95% . The 1/3 that machines the deepness of sclerotic layer to be able to amount to cutting deepness or bigger; The hardness of sclerotic layer is compared rise so 1.
4 ～ 2.
2 times. Because the plasticity of stainless steel is big, the character and morals when plasticity is out of shape is crooked twist, coefficient of intensification is very big; And austenite is not quite stable, below the action of cutting stress, partial austenite can transform for martensite; Fall in the action of heat in metal cutting plus compound impurity, decompose easily show dispersion to distributing, make cutting adds man-hour to produce sclerotic layer. Before primary feed or the treatment that place of before one working procedure produces are sclerotic the success that the phenomenon affects follow-up working procedure badly. Cutting muscularity: Stainless steel is out of shape in the plasticity in cutting process big, especially austenite stainless steel (1 what its percentage elongation exceeds 45 steel.
) of 5 times above, make cutting force adds. In the meantime, the treatment of stainless steel is sclerotic and serious, hot intensity is high, increased cutting to fight force further, those who cut bits is curly it is more difficult also to break off. Because this machines the cutting muscularity of stainless steel, if the unit cutting force of turning 1Cr18Ni9Ti is 2450MPa, taller than 45 steel 25% . Cutting temperature is high: The plasticity when cutting is out of shape reach very as big as the attrition between cutting tool, the heat in metal cutting of generation is much; The ½ ～ that adds the coefficient of thermal conductivity of stainless steel to be 45 steel about ¼ , a large number of heat in metal cutting are centered in cutting area and knife, on the interface that bits contacts, medicinal powder hot condition is poor. Below same condition, the cutting temperature of 1Cr18Ni9Ti is higher than 45 steel 200 ℃ left and right sides. Cut bits to break off not easily, easy felt: The plasticity of stainless steel, tenacity is very big, bits is cut when the car is machined continuous and ceaseless, affect the success of the operation not only, cut bits to still can squeeze an injury to already machined the surface. Below high temperature, high pressure, the endophilicity of stainless steel and other metal is strong, phenomenon of easy generation conglutinate, form the tumour that accumulate bits, already aggravate cutting tool wears away, can appear again tear at phenomenon and make already machined exterior aggravation. This one characteristic of the martensite stainless steel with the inferior quantity that contain carbon is more apparent. Cutting tool is easy wear away: Process of cutting stainless steel kisses mediumly and action, make knife, felt of the generation between bits, diffuse, make cutting tool produces felt to wear away thereby, diffuse wear away, crescent moon of generation of face of the knife before causing cutting tool is depression, cutting blade still can be formed flake tinily and breach; The carbide in adding stainless steel (if TiC) is atomic hardness is very tall, contact with cutting tool directly when cutting, attrition, abrade cutting tool, still have treatment sclerosis appearance, all can make cutting tool wears away aggravate. Linear expansion coefficient is big: 1 what the linear expansion coefficient of stainless steel is carbon steel about.
5 times, below cutting temperature action, workpiece produces heat easily to be out of shape, dimension precision is controlled harder. When 5 cutting stainless steel how to choose cutting tool material? Material of logical choice cutting tool is to assure efficient the fundamental condition of cutting treatment stainless steel. According to the cutting characteristic of stainless steel, material of requirement cutting tool should have hear resistance good, wearability is tall, with stainless steel kiss and effect is little wait for a characteristic. At present commonly used cutting tool material has high-speed steel and hard alloy. The choice of high-speed steel: High-speed steel basically uses the complex multiple-cutting-edge tool such as production milling cutter, broach, tap, broach. Durability of the cutting tool when W18Cr4V of common high-speed steel is used is very low already did not accord with need, use stainless steel of cutting of cutting tool of new-style high-speed steel to be able to achieve better result. Below same turning condition, with W18Cr4V and 95w18Cr4V the cutting tool of two kinds of material processes 1Cr17Ni2 work, a number that cutting tool blade wears treatment mix 12 3 times for 2 ～ respectively, the cutting tool durability that uses 95w18Cr4V rose severalfold. Because increased the amount containing carbon of steel,this is, added content of the carbide in steel thereby, it is better that normal temperature hardness raises 2HRC red rigid, when 600 ℃ by the HRC48 of W18Cr4V.
5 rise to HRC51 ～ 52, wearability raises 2 ～ than W18Cr4V 3 times. W12Cr4V4Mo of high-speed steel of applied tall vanadium is made model 1Cr17Ni2 of treatment of face milling cutter can obtain taller cutting tool durability. Because contain vanadium quantity to increase, the VC with very tall hardness can be formed in steel, petty VC consist in brilliant uprights, can prevent grain to be brought up, raise the wearability of steel; The red rigid of W12Cr4V4Mo is very good, the hardness when 600 ℃ can amount to HRC51.
7, because this agrees with,make all sorts of complex cutting tool of cutting stainless steel. Dan Jijiang is spent (Sb=3140 MPa) and concussion tenacity (Ak=2.
5J/cm3) slightly under W18Cr4V, when using, want to notice slightly. Make ceaseless progress of the technology as cutting tool, to approving generous work, it is better to use hard alloy much blade, complex cutting tool to undertake cutting machines the effect. The choice of hard alloy: YG kind the tenacity of hard alloy is better, can use bigger before horn, edge also can be ground some tartlier, make cutting light, and cut bits and cutting tool to produce felt not easily, more comfortable at processing stainless steel. It is especially when oscillatory thick car and interrupted cutting, YG kind this one good point of alloy is more main. Additional, YG kind the thermal conductivity of alloy is better, its coefficient of thermal conductivity is taller than high-speed steel near double, than YT kind alloy is one times taller. Because of this YG kind alloy applies in stainless steel cutting more, be in especially thick lathe tool, cut off the knife, reamer and reamer application in making more extensive. Longer since period, the cutting tool material that the hard metal that uses the common name such as YG6, YG8, YG8N, YW1, YW2 commonly regards cutting as stainless steel, but all cannot achieve idealer result; Be like,use new name hard metal 813, 758, 767, 640, 712, 798, YM051, YM052, YM10, YS2T, YD15, cutting stainless steel can achieve better result. And with effect of stainless steel of austenite of cutting of cutting tool of 813 brands hard alloy very good, because 813 alloy have taller hardness already (≥ HRA91) , intensity (Sb=1570MPa) , have good high temperature tenacity again, fight oxidisability, fight caking property, it is good that its organize compact wearability. When 6 cutting stainless steel how to choose parameter of cutting tool geometry? Before horny G0: The hardness of stainless steel, intensity is not high, but its plasticity, tenacity is better, hot strong sex is tall, bits is cut to be cut not easily to leave when cutting. Below the premise that makes sure cutting tool has enough strength, should choose bigger before horn, can reduce not only so be out of shape by the plasticity of cutting metal, and can drop cutting force and cutting temperature, make sclerotic layer deepness is reduced at the same time. Turning of all sorts of stainless steel before horn is 12 ° ～ roughly 30 ° . To martensite stainless steel (be like 2Cr13) , before horn is desirable greater value; To austenite and austenite + ferrite stainless steel, horn should take lesser cost before; Be handled to pledging without tone or move the stainless steel with the inferior hardness after pledging, desirable bigger before horn; Lesser or the diameter is thin mural workpiece, appropriate is used bigger before horn. High-speed steel milling cutter takes Gn=10 ° ～ 20 ° , hard alloy milling cutter takes Gn=5 ° ～ 10 ° ; Reamer takes G0=8 ° ～ commonly 12 ° ; Tap takes 20 ° of G0=15 ° ～ commonly (machine with) or G0=20 ° (the hand uses) . Hind horny A0: Face of the knife after the horn after increasing can be reduced chafes with what machine the surface, but can make the intensity of cutting blade is mixed medicinal powder heat energy force is reduced. Reasonable value of horn depends on after cutting ply, cutting ply hour, the horn after appropriate choosing is bigger. Stainless steel lathe tool or boring cutter take A0=10 ° ～ normally 20 ° (finish machining) or 10 ° of A0=6 ° ～ (rough machining) ; High-speed steel carries milling cutter to take A0=10 ° ～ 20 ° , establish milling cutter to take A0=15 ° ～ 20 ° ; Hardness alloy carries milling cutter to take A0=5 ° ～ 10 ° , establish milling cutter to take A0=12 ° ～ 16 ° ; Reamer and tap take A0=8 ° ～ 12 ° . Graph dip of 1 pair of blade breaks tool cutting edge angle of bits lathe tool Kr, deputy slant R of horny K ′ , with Re: Reduce tool cutting edge angle to be able to increase edge job length, be helpful for coming loose hot, but make in cutting process radial load is increased, easy generation is oscillatory, often take Kr=45 ° ～ 75 ° , if the machine tool is rigid insufficient, can increase appropriately. Deputy slant horn often takes ～ of ° of K ′ R=8 15 ° . To strengthen point of a knife, should grind an E=0 commonly.
5 ～ 1.
The circular arc of point of a knife of 0 Mm. Blade dip Ls: To increase strength of point of a knife, blade dip takes Ls=-8 ° ～ commonly - 3 ° , bigger cost is taken when interrupted cutting Ls=-15 ° ～ - 5 ° . In producing practice, cut bits to be out of shape to increase, raise point of a knife intensity and medicinal powder heat energy force, use lathe tool of double blade dip, obtained the favorable result that break bits, also broaden the limits that break bits, if pursue,1 is shown. 0 ° of ≥ of Ls1 of dip of the first blade, dip of the 2nd blade is close to place of point of a knife, ls2 ≈ - 20 ° , the edge length Lls2 of dip of the 2nd blade. ≈ Ap/3. 8 ° of ～ of the G0=20 ° when lathe tool of double blade dip, A0=6 ° , Kr=90 ° or ° of G01=-10 of the 75 ° , horn before pouring arris, Re=0.
15 ～ 0.
When 2 Mm, in Vc=80 ～ 100 M/min, F=0.
2 ～ 0.
The condition of 15 Mm of ～ of 3 Mm/r, Ap=4 issues cutting, the result that break bits is favorable, cutting tool durability is tall. The exterior surface roughness of face of knife of around of requirement cutting tool is worth small, cutting tool grinds VB of blunt mark awl to be the 1/2 that processes average data. Graph of 2 cutting stainless steel break (roll) bits chamfer when 7 cutting stainless steel how is choice cutting tool broken (roll) bits chamfer and point form? Appropriate cutting tool still should choose to break when cutting stainless steel (roll) bits chamfer, so that control is continuous ceaseless cut bits, use form of complete circular arc or linear round arc to break normally (roll) bits chamfer. Break (roll) the 5 Mm of width Bn=3 ～ of bits chamfer, groovy deep H=0.
5 ～ 1.
3 Mm, rn=2 ～ 8 Mm. Usually, the Ap when thick car, F is big, break (roll) bits chamfer appropriate is wide and shallow; The Ap when fine vehicle, F is small, should narrow and some deeper. Break (roll) the form of bits chamfer sees a picture 2. In cutting treatment process, if happen,cut bits to twine the phenomenon on workpiece or cutting tool, express (roll) bits chamfer is too wide too shallow, can increase feed, make cut bits to break off; If cut bits to squeeze make friends to be inside groove, give out creak sound, or cut bits to splatter person, express (roll) bits chamfer is too narrow too deep, can reduce feed at this moment. Notice to be controlled even at the same time (roll) the position of bits chamfer. Break (roll) the dimension of bits chamfer sees a table 1, watch 2 with the watch 3. Watch 1 outside round lathe tool is broken (roll) diameter of workpiece of bits chamfer dimension (° of G0(of the horn before Bn(mm) of width of Mm) radius Rn(mm) ) Bg(mm) of dimension pouring arris ≤ 201.
5242 fine vehicle: 0.
05 ～ 0.
10 thick cars: 0.
10 ～ 0.
533720 ～ 4033303.
40 ～ of 5304430 ＞ 8044304.
80 ～ of 5305530 ＞ 2005.
5527 fine vehicle: 0.
10 ～ 0.
20 thick cars: 0.
15 ～ 0.
5 ＞ 2006.
5 watches 2 boring cutter are broken (coil) bits chamfer dimension bores hole diameter (stainless steel of austenite of 1Cr18Ni9Ti of treatment of Mm) radius Rn(mm) and treatment of stainless steel of martensite of medium hardness 2Cr13 are able to bear or endure ° of G0 (of the horn before the Bn (mm) of width of martensite stainless steel such as stainless steel of thick nitric acid and harder 2Cr13, 3Cr13) before width Bn (mm) .
20 ～ of 530 ＞ 402.
40 ～ of 828 ＞ 604.
60 ～ of 024 ＞ 804.
5 ＞ 805.
021 watches 3 cut off a knife to break (roll) maximum diameter of bar sheared of bits chamfer dimension (20 ＞ of Mm) ≤ 50 ＞ of 20 ～ 80 ＞ of 50 ～ 120 radius of 80 ～ Rn (mm)2.
° of G0 (of the horn before 58 width Bn (mm)345456567678) 373936.
When 5308 cutting stainless steel how to choose cutting dosage? Cutting dosage is right force of the treatment sclerosis when processing stainless steel, cutting, heat in metal cutting have very big effect, be opposite especially the impact of cutting tool durability is bigger. The cutting dosage of the choice is reasonable, effect of immediate impact cutting. Express 4 cars whorl and auger, the cutting dosage of Kong Shi of enlarge, bore with a reamer 20 ～ of whorl of Ap(mm) car of deepness of cutting of F(mm/r) of feed of Vc(m/min) of speed of cutting of working procedure name 50-0.
1 bore of 1 ～ 12 ～ 200.
1 ～ 0.
25 ≤ 17.
5 reaming 8 ～ 180.
1 ～ 0.
1 bore with a reamer of 1 ～ aperture 2.
5 ～ 50.
1 ～ 0.
1 ～ 0.
2 note: Cutting tool material is Vc of speed of high-speed steel cutting: Rate of the cutting when processing stainless steel rises a little a bit, cutting temperature is met tower above a lot of, cutting tool wears away aggravate, durability drops substantially. To assure reasonable cutting tool durability, be about to lower cutting rate, press turning commonly the 40% ～ of common carbon steel 60% choose. When bore hole and be being cut off, because cutting tool is rigid, medicinal powder cooling and hot condition, lubricant effect and difference of the circle outside discharging bits circumstance to compare a car, cutting speed is reduced appropriately even. The cutting processability of the stainless steel of different sort each are not identical, cutting speed also needs to be adjusted accordingly. Corrective coefficient Kv is the cutting speed of the austenite stainless steel such as general 1Cr18Ni9Ti 1.
0, hardness is in the Kv of the martensite stainless steel such as the 2cr13 under HRC28 1.
3 ～ 1.
5, hardness is HRC28 ～ the Kv of the martensite stainless steel such as the 2Cr13 of 35 is 0.
9 ～ 1.
1, hardness is in the Kv of the martensite stainless steel such as the 2Cr13 of HRC35 above 0.
7 ～ 0.
8, be able to bear or endure the Kv of stainless steel of thick nitric acid is 0.
6 ～ 0.
7. Cutting deepness Ap: The surplus when rough machining is larger, should choose bigger cut deep, can reduce knife number, can avoid point of a knife and contact of semifinished product skin at the same time, reduce cutting tool to wear away. But increase cut answer greatly the attention does not pass because of cutting force big and cause vibration, 5 Mm of optional Ap=2 ～ . The optional and lesser cutting deepness when finish machining, keep away from even sclerotic layer, use Ap=0 commonly.
2 ～ 0.
5 Mm. Feed F: The accretion of feed is restricted not only by machine tool dynamic, and cutting remain height and height of the tumour that accumulate bits follow the addition of feed and increase, accordingly feed cannot pass big. Machine exterior quality to rise, lesser feed should be used when finish machining. In the meantime, should notice F must not is less than 0.
1 Mm/r, avoid minim feed, lest machining sclerotic area to undertake cutting, and should notice cutting blade does not stay in cutting surface. The cutting dosage that processes stainless steel sees a table 4 with the watch 5. The dosage of commonly used cutting that expresses 5 stainless steel workpiece diameter limits (the circle outside Mm) car bores hole cut off ≤ of F(mm/r) of feed of N(m/min) of rotate speed of main shaft of F(mm/r) of feed of N(m/min) of rotate speed of main shaft of F(mm/r) of feed of N(m/min) of rotate speed of main shaft of F(mm/r) of feed of N(m/min) of rotate speed of main shaft of rough machining finish machining 101200 ～ 9550.
19 ～ 0.
601200 ～ 9550.
10 ～ 0.
201200 ～ 6750.
07 ～ 0.
955 hands of 301200 ～ move ＞ 20955 ～ of 10 ～ 765955 ～ of 765955 ～ 765 ＞ of 600955 ～ 40765 ～ of 20 ～ 4800.
27 ～ 0.
81765 ～ 4800.
10 ～ 0.
30765 ～ 4800.
10 ～ 0.
50765 ～ 6000.
10 ～ 0.
40 ～ of 25 ＞ 380600 ～ of 60480 ～ 380610 ～ of 380480 ～ 60 ～ of 480 ＞ 305480 ～ of 80380 ～ 230180 ～ of 305380 ～ 80 ～ of 305 ＞ 230380 ～ of 100305 ～ 185380 ～ of 230305 ～ 2300.
08 ～ 0.
100 ～ of 20 ＞ 150305 ～ of 150230 ～ 150305 ～ of 185230 ～ 150 ～ of 150 ＞ 120230 ～ of 200185 ～ 150185 ～ 120150 with chip in: Workpiece material: 1Cr18Ni9Ti; Cutting tool material: YG8. The lesser diameter in the watch chooses higher main shaft rotate speed, bigger diameter chooses inferior rotate speed. When workpiece material and cutting tool material are different, main shaft rotate speed should be made according to particular case proper and corrective. When 9 cutting stainless steel how to choose cutting fluid and cooling way? Because the cutting processability of stainless steel is poorer, the refrigeration of fluid, lubricant to cutting, permeate reach clean function to have higher demand, commonly used cutting fluid has the following kinds: Sulfurized oil: Be it is with sulfur extremely the cutting that presses additive is oily. Sulfide of high melting point can be formed in metallic surface in cutting process, and destroy not easily below high temperature, have favorable lubricant effect, have certain cooling effect, apply to aperture of general turning, bore, bore with a reamer and tap. Vulcanization soya-bean oil is applied to auger, the working procedure such as aperture of enlarge, bore with a reamer. The recipe of direct sulfurized oil is: Mineral oil 98% , sulfur 2% . The recipe of indirect sulfurized oil is: Mineral oil 78% ～ 80% , oily or the plant is lardy 18% ～ 20% , sulfur 1.
7% . The mineral oil such as oil of engine oil, spindle: Its lubricity can be better, but cool and osmotic poorer, vehicle of fine of the circle outside applying to. Vegetable oil: Wait like rape oil, soya-bean oil, its lubricity can be better, apply to the working procedure such as car whorl and aperture of bore with a reamer, tap. Emulsion: The refrigeration with be had better and clean function. Also have certain lubricant effect, can use at stainless steel thick car. Should make in cutting treatment process cutting fluid nozzle targets cutting area, or had better use the cooling means such as high-pressured refrigeration, sparge refrigeration. Remarks of F(mm/min) of feed of N(r/min) of rotate speed of main shaft of D0(mm) of diameter of milling cutter of milling cutter sort establishs the milling dosage that expresses milling cutter of 6 high-speed steel to process stainless steel milling cutter 750 hands move 41180 ～ of 3 ～ to be mixed when cutting width when cutting deepness is lesser, feed F takes big cost; When taking the martensite stainless steel such as 2Cr13 of little value milling conversely, should adjust milling dosage according to the actual hardness of workpiece material milling is able to bear or endure when stainless steel of thick nitric acid, milling rate and feed all should reduce 5 ～ appropriately 4758 ～ of 6750 ～ 37512 ～ of 10600 ～ 23530 ～ of 14375 ～ 37.
18300 ～ of 516 ～ 23537.
5 ～ 47.
25235 ～ of 520 ～ 19047.
6032 ～ of 5 ～ 36190 ～ 15047.
6040 ～ of 5 ～ 50150 ～ 11847.
75 undee blade establish 5 ～ milling cutter 36190 ～ 15047.
6040150 ～ of 5 ～ 956095 ～ of 11850118 ～ 7560 ～ 75 curium a milling cutter and 3 blade milling cutter 75235 ～ 15023.
5 or the hand moves 110150 ～ 6020075 ～ of 7515095 ～ 37.
510 how to undertake to stainless steel milling is machined? The characteristic of milling stainless steel is: The adhesiveness of stainless steel and frit are worn the gender is strong, cut bits easy conglutinate is on milling cutter tooth, make cutting condition exasperate; When going against mill, tooth preexistence is already sclerotic apparently glide, increased to machine sclerotic trend; The concussion when milling, vibration is bigger, make blade of easy collapse of milling cutter tooth is mixed wear away. Milling stainless steel establishs milling cutter to be able to make material of milling cutter tooth with hard alloy except upright milling cutter and part outside, of all kinds milling cutter all uses the rest high-speed steel, especially tungsten, molybdenum department and tall vanadium high-speed steel have favorable effect, durability of its cutting tool can raise 1 ～ than W18Cr4V 2 times. The hard alloy brand of milling cutter of the appropriate stainless steel that make has YG8, YW2, 813, 798, YS2T, YS30, YS25. When milling stainless steel, cutting blade wants already sharp want to be able to bear again concussion, the chamfer that hold bit wants big. Can use milling cutter of big helix angle (columnar milling cutter, establish milling cutter) , helix angle B increases 45 ° from 20 ° (Gn=5 ° ) , cutting tool durability can raise 2 times above, because right now G0e of the horn before the job of milling cutter increases 27 ° above by 11 ° , milling is light. But B value shoulds not be again great, establish milling cutter especially with B ≤ 35 ° are advisable, lest weaken tooth. Use undee blade to establish milling cutter to machine stainless steel to be in charge of material or Bao Bi, cutting is light, vibration is little, cut bits brittle, workpiece is not out of shape. Establish milling of milling cutter high speed with hard alloy, but dislocation carries stainless steel of milling cutter milling to be able to obtain favorable result. With silvery white bits (SWC) carries 1Cr18Ni9Ti of milling cutter milling, its geometry parameter is ° of R=35 of ′ of Gf=5 ° , Gp=15 ° , Af=15 ° , Ap=5 ° , Kr=55 ° , K, G01=-30 ° , Bg=0.
4mm, Re=6mm, when Vc=50 ～ 6mm of ～ of P=2 of ′ of 750mm/min of 90 M/min, Vf=630 ～ , A and every tine feed is amounted to 0.
4 ～ 0.
When 8mm, milling force reduces 10% ～ 15% , milling power drops 44% , efficiency also rises greatly. Its principle is to be in advocate grind on cutting blade piece lose edge, the artificially generation when milling accumulates bits tumour, make its replace cutting blade to undertake cutting, of the tumour that accumulate bits before horny Gb can amount to 20~ ～ 302, as a result of the action of tool cutting edge angle, the tumour that accumulate bits gets before the parallel of the generation on knife face becomes deputy bits at the thrust action of cutting blade to pour out of, took away heat in metal cutting thereby, dropped cutting temperature. When milling stainless steel, answer to use treatment of suitable mill law as far as possible. Law of asymmetry suitable mill can make sure cutting blade makes the same score quietly to be cut from inside the metal from, area of contact of the felt that cut bits is lesser, the action that leaves mental efforts in high speed falls to be swung easily, when lest tooth is cut afresh,entering work, generation of face of the knife before the concussion that cut bits flakes and collapse blade phenomenon, raise the durability of cutting tool. Use spray cooling law effect is most distinct, can raise milling cutter durability one times above; If use general 10% emulsion are cooling, should make sure cutting fluid discharge achieves sufficient refrigeration. When stainless steel of milling of hard alloy milling cutter, take Vc=70 ～ 150 M/min, vf=37.
5 ～ 150 Mm/min, the basis answers to combine gold date and workpiece material in the meantime differ to be adjusted appropriately. The cutting dosage of high-speed steel milling cutter sees a table 6. 11 how to undertake bore to stainless steel? What problem should note when bore? On stainless steel workpiece bore often uses twist drill, to hard stainless steel of temper by dipping in water, broach of usable hard alloy, conditional when usable exceed hard high-speed steel or exceed broach of fine grain hard alloy. The torque when bore and axial muscularity, cut bits to break off easy felt, not easily and the difficulty that discharge bits, machine sclerotic aggravate, broach corner office is easy wear away, broach tigidity differs easy generation vibration. Because this asks broach grinds chamfer of bits giving cent, repair the blade that grind a horizontal stroke in order to reduce axial force, long wear double vertex angle comes loose with improvement hot condition. Get the typical bit that cuts stainless steel (namely stainless steel group auger) if pursue,show 3 times. Graph 3 stainless steel group get a picture 4 stainless steel decide form of 5 S of bits broach graph hard alloy broach pursues broach of 6 4 first flank pursues 3 in L ≈ 0.
32d0, l/2>L1>L/3, r ≈ 0.
04d0, b ≈ 0.
04d0. When using this kind of broach getting to cut 1Cr18Ni9Ti, plant to mm3 of Ø20 Mm, Ø25 Mm, diametical broach, use N=105 R/min, f=0.
32 Mm/r, 0.
4 Mm/r, 0.
56 Mm/r, 0.
The feed that 67 Mm/r differs 4 kinds, all can break bits and platoon bits smoothly. Still can use stainless steel to break bits broach (form of graph 4) , S hard alloy broach (broach of graph 5) , 4 first flank (graph 6) and but shallow Kong Zuan of dislocation hard alloy. Break bits broach with stainless steel (when graph 4) machines 2Crl3 of martensite stainless steel, need to grind an E-E to be in bits chamfer only; And get when cutting stainless steel of treatment LCrl8Ni9Ti austenite, still need to add A-A to be in bits chamfer. The specific parameter that stainless steel breaks bits broach and get applicably cut dosage to see a table 7. S form the characteristic of hard alloy broach is: Without horizontal blade, can reduce axial force 50% ; The horn before the place that get a heart is be worth, point is sharp; The ply that get a heart increases, raised broach tigidity; Have opening of fluid of two gush cutting; Blade of cutting of circular arc form and platoon bits chamfer distributing reasonable, facilitate cut bits to become small, with benefit eduction. But the characteristic that shallow aperture of dislocation hard alloy gets is: Broach front asymmetry contains razor blade of two protruding triangle, cent bits excises the different share of aperture, can automatic centering, the linearity of aperture is good, and cut enter cut length weak point; Many hole shape is contained to break bits chamfer on face of the knife before bit, cutting performance is good, break bits especially reliable, cut bits to show those who agree is broken a bits; Refrigeration makes cutting fluid direct inside gush to auger cut treatment surface, improve cooling result, platoon bits special unobstructed; Can use the hard alloy bit of different name according to workpiece material especially, cutting speed amounts to 80 ～ 120m/min, auger cut very light. Process austenite stainless steel auger cut dosage to see a table 8. The chamfer breaking bits that expresses 7 stainless steel to break bits broach and auger cut dosage 8 ～ of ＞ of F(mm/r) of feed of N(m/min) of rotate speed of main shaft of BE(mm) of width of RE(mm) of radius of BA(mm) of width of RE(mm) of radius of broach diameter D0(mm) 153.
0 ～ 5.
5 ～ 3.
0 ～ 3.
0 ～ 2.
5210 ～ 3350.
09 ～ 0.
15 ～ of 12 ＞ 205.
0 ～ 6.
0 ～ 3.
5 ～ 4.
5 ～ 3.
265 ＞ of 0210 ～ 20 ～ 256.
5 ～ 7.
5 ～ 4.
0 ～ 4.
8 ～ 3.
3170 ～ 2100.
12 ～ 0.
25 ～ of 14 ＞ 307.
5 ～ 8.
5 ～ 5.
5 ～ 5.
0 ～ 3.
5132 ～ 170 get when cutting stainless steel, often discover broach wears away easily, break off, aperture surface is rough, appear sometimes deep trench and cannot eliminate; Bore diameter is too big, aperture form out of round or to tilt at the same time wait for a phenomenon. Following item should notice when the operation: Geometrical appearance must blade is ground correct, two cutting blade should keep symmetrical. The part after broach is too large, can arise " plunge into a knife " phenomenon, cause flutter, make the Kong Cheng that gets polygonal. Should repair the blade that grind a horizontal stroke, in order to reduce bore axial force. Broach must be installed, hold bit sharp, with blunt hind should repair in time grind. Parameter of geometry of logical choice broach and auger cut dosage, press bore deepness to ask, should shorten as far as possible broach length, increase the ply that get a heart in order to increase tigidity. When broach of use high-speed steel, cutting speed cannot exorbitant, burn out in case edge. Feed shoulds not be too big, in case broach wears away aggravate or make Kong Zuan slants, cutting should move appropriately with the feed when be being cut small. Sufficient refrigeration is lubricant, cutting fluid is general with sulfurized oil advisable, discharge is not gotten little at 5 ～ 8 L/min, cannot midway stops to cool, it is when the diameter is bigger, should use as far as possible inside cooling means. Serious attention is gotten cut a course, answer to observe condition of the eduction that cut bits in time, if discovery cuts bits,mixed and disorderly winding retreats knife examination instantly, cut bits in order to prevent to jam. Still should notice voice of machine tool movement, discovery should retreat a knife in time unusually, cannot let bit getting cut apparently stay, get in case cut case hardening aggravate. Those who express 8 austenite stainless steel auger cut dosage 51000 ～ of ≤ of F(mm/r) of feed of N(m/min) of rotate speed of main shaft of broach diameter D0(mm) 7000.
08 ～ 0.
5 ～ of 15 ＞ 500 ＞ of 10750 ～ 15600 ～ of 10 ～ 4000.
12 ～ 0.
15 ～ of 25 ＞ 20450 ～ 2000.
15 ～ 0.
20 ～ of 35 ＞ 150 ＞ of 30400 ～ 40250 ～ of 30 ～ 1000.
20 ～ 0.
The 4012 problems breaking bits when how solving bore of acid-proof stainless steel? The plasticity of acid-proof stainless steel and tenacity are very big, the main problem that exists when bore is to not allow to break bits easily, affect the afflux of cutting fluid, cutting area temperature is high, cutting tool durability is low, productivity is low. When bore, cutting negative charge is big, form cut bits to want to waste a lot of energy, the high temperature intensity plus this kind of stainless steel and hardness are tall, auger bits is being cut when leaving break off not easily; At the same time cold make sclerotic appearance very serious, case hardening degree can amount to 100% above, sclerotic layer ply is amounted to 0.
1 ～ 0.
2mm. The coefficient of thermal conductivity of acid-proof stainless steel is small, have the 1/3 ～ 1/4 of carbolic steel only, cutting area temperature is very high, with other metal kiss and action is strong and the hard particle that exists in material, aggravate of cutting tool wear away. To solve the problem breaking bits when bore of acid-proof stainless steel, developed new-style get acid-proof stainless steel to break bits group auger, bits is cut to grow 100mm left and right sides to show when using its drill " firework " shape from Kong Zhong eduction, the effect that break bits is very ideal. This kind of key that cuts bits should giving in bore process is: Want to make the dot that divide bits is in the critical condition that divide bits; 2 should grind appropriately piece auger the needle is tall (H=0.
05D ～ 0.
07D) and circular arc radius (R=0.
2D) ; 3 it is L1=1.
7 ～ 3.
3 Mm position should choose appropriate, cooperate proper big feed and inferior cutting speed, make cut bits to break off in inclined pigheaded condition. Use acid-proof stainless steel to break bits group when getting bore, should choose inferior cutting speed and bigger feed, be helpful for achieving bit. 13 how to have opening of bore with a reamer to stainless steel? To Kong Shi of stainless steel bore with a reamer, the problem that often encounters is: Aperture surface allows groove of easy line out, surface roughness is poor, bore diameter out of tolerance, present horn opening, reamer is easy wear away etc. Do not differ with the cutting processability of phyletic stainless steel, the issue that shows in aperture of bore with a reamer is different also, if be mixed to the austenite stainless steel such as 1Cr18Ni9Ti,be able to bear or endure stainless steel of thick nitric acid when aperture of bore with a reamer, basically be reamer wears away problem; And wait for martensite stainless steel to 2Cr13 when aperture of bore with a reamer, basically be the surface roughness that assures aperture of bore with a reamer not easily and dimension precision problem. To avoid these problems, should notice the following item: Logical choice reamer and bore with a reamer cut dosage, it is the key that makes sure aperture of bore with a reamer goes on wheels. (2) improves quality of prior operation working procedure, prevent prior operation aperture to appear delimit line of appearance of channel, elliptical, polygonal, taper or horn mouth, waist drum, axes bends, deflective wait for a phenomenon. Maintain moderate of workpiece material qualitative hardness, be opposite especially 2Cr13 martensite stainless steel, the hardness after tone is handled character is under HRC28 is advisable. Install reamer and workpiece correctly, reamer must be installed, reamer axes should be mixed the axes of aperture maintains workpiece prior operation consistent, in order to make sure each tooth is even cutting. Choose appropriate cutting fluid, can solve the problem of the conglutinate that cut bits of stainless steel, the successful platoon bits that makes, reduce aperture surface thereby surface roughness and raise cutting tool durability. General in order to use sulfurized oil advisable, if be in sulfurized oil,be in lardy in add 20% ～ 30%CCl4, have distinct effect to reducing exterior surface roughness. Because CCl4 is right human body is harmful, appropriate uses sulfurized oil 85% ～ 90% with kerosene 10% ～ the mixed liquor of 15% . When reamer diameter is bigger, can use inside cooling means. Note the procedure of aperture of bore with a reamer seriously, the jumpy quantity of close check tooth, it is the key that obtains even bore with a reamer to cut. The course is cut in bore with a reamer in, the attention cuts the figure of bits, because bore with a reamer cuts surplus small, cut bits to show foil to coil shape or show very short snail to coil shape. If cut bits size differ, some shows broken end account, some to show small lump, demonstrative bore with a reamer is cut inhomogenous. If cut bits to show bedspring shape, demonstrative bore with a reamer cuts surplus too big. If cut bits to submit form of acicular, fragment, demonstrative reamer has been ground blunt. Prevent to cut bits to jam even, ying Qin is not had at observing tooth has stick bits, in order to avoid bore diameter out of tolerance. When aperture of bore with a reamer of reamer of use hard alloy, phenomenon of systole of meeting occurrence aperture, hair pulls aperture when retreating a knife to prevent, can adopt increase tool cutting edge angle to improve this kind of condition. 14 how to undertake tap to stainless steel? Than going up in general steel products in the tap on stainless steel tap wants difficulty much. Because torque is big,often appear, tap by " bite dead " in screw, collapse ages or break off, whorl surface not only, channel grain, dimension out of tolerance, chaos is buckled and tap wears away to wait for a phenomenon badly. Accordingly, attack relevant technical measure should be adopted to try to solve when making stainless steel thread. Attack when making stainless steel thread, "Bilge tooth " the phenomenon is more serious, tap is easy " bite dead " in Kong Zhong, so whorl bottom outlet should be increased appropriately. Usually, pitch is equal to nominal diameter for the diameter of whorl bottom outlet under 1mm subtractive pitch; When pitch is more than 1mm, diameter of whorl bottom outlet is equal to nominal diameter to subtract 1.
1 times pitch. Graph the tap with the appropriate option of the tap that do not have groove that 7 treatment stainless steel uses and reasonable cutting dosage, it is the key that matters to tap quality. Tap material, should choose contain cobalt or aluminium to exceed hard high-speed steel; Tool cutting edge angle and pitch, tap concerns number, 7 ° of ～ of ° of head awl Kr=5, 2 awl, 3 awl are Kr=10 ° ～ 20 ° ; Calibration part takes 3 ～ commonly 4 buckle whorl length, have 0.
05 ～ 0.
Of 1mm/100 Mm pour awl; Direction of the chamfer that hold bit takes B=8 ° ～ commonly 15 ° , can control direction of the flow that cut bits, to straight chamfer tap, can change tap front wear gyroidal; Of tap before horn is Gp=15 ° ～ commonly 20 ° , horn is 8 ° ～ after 12 ° . Can use the tap that do not have groove to be opposite stainless steel tap, see a picture 7. The bottom outlet diameter before using the tap that do not have groove to squeeze silk is: D0=dw-(0.
In 6)P type: Dw -- workpiece thread outside diameter, mm; P -- pitch. (When tap of 4) stainless steel, should assure to have enough cooling lubricating fluid. Can choose sulfurized oil normally + 15% ～ 20%CCl4; Bai Qian is oily + engine oil or other mineral oil; Olefin of kerosene dilute chloridize. In the process of tap, in case tap breaks off, can put work in nitric acid solution to undertake cankerous, can corrode high-speed steel tap very quickly, and do not discard as useless workpiece. What characteristic does 15 grinding stainless steel have? The tenacity of stainless steel is big, hot intensity is high, and the cutting cutting tool that emery wheel grinds bead has the larger part before losing, bits is ground to be cut not easily to leave in grinding process, cutting resistance is great, extruding, attrition is acuteness. Power of unit area grinding is very great, grinding temperature can amount to 1000 ℃ ～ 1500 ℃ . In the meantime, below the action of high temperature high pressure, grind bits easy conglutinate to be on emery wheel, cram obliterates an asking gap, make grind bead to lose cutting action. The type of stainless steel is different, the situation that generation emery wheel jams is not same also, if grinding is able to bear or endure,stainless steel of thick nitric acid reachs heat-resisting stainless steel, conglutinate, jam the phenomenon is more serious than 1Cr18NiTi, and the martensite stainless steel such as 1Cr13, 2Cr13 is lighter. The coefficient of thermal conductivity of stainless steel is small, the high temperature when grinding derives not easily, the phenomenon such as burn of workpiece surface easy generation, anneal, anneal layer deepness can be amounted to sometimes 0.
01 ～ 0.
02 Mm. The extruding with the serious generation in grinding process is out of shape, bring about grinding surface to produce treatment sclerosis, especially when grinding austenite stainless steel, because austenite organizes insufficient stability, after grinding, easy generation martensite is organized, make case hardening serious. The linear expansion coefficient of stainless steel is big, easy below the action with hot grinding generation is out of shape, its dimension is controlled hard. Especially Baobi and long and thin spare parts, this phenomenon is more serious. The stainless steel of most type cannot be magnetized, when planar grinding, can rely on machinery to place solid or special fixture to place only hold work, use work of workpiece flank clamp, generation is out of shape and cause appearance or on size error, laminose work is more outstanding. The flutter in also can causing grinding process at the same time and the ripple of shape of occurrence scale spot. When 16 grinding stainless steel how to choose emery wheel? Abrasive: Bai Gangyu has better cutting function and from acute sex, comfortable reach martensite at grinding martensite + ferrite stainless steel; Abrasive of single crystal corundum applies to grinding austenite and austenite + ferrite stainless steel; Microcrystalline corundum abrasive is comprised by a lot of tiny crystal, it is good from acute sex that tall, tenacity mixes strength, its the characteristic from acute is the aperture disintegrate with microcrystalline edge, obtain the tall sex such as small blade sex and small blade thereby, can reduce burn, play the phenomenon such as wool, can reduce grinding surface surface roughness, comfortable at grinding all sorts of stainless steel; The hardness that cubic nitrogen changes boracic abrasive is very tall, thermal stability is good, chemical laziness is tall, in 1300 ℃ ～ 1500 ℃ do not oxidize, the blade top that wears bead becomes not easily blunt, the grinding heat of generation is little also, apply to grinding all sorts of stainless steel. To reduce conglutinate phenomenon, also can use carborundum and making synthetic diamond to be the emery wheel of abrasive. Granuality: When grinding stainless steel, general in order to use the 36 date, emery wheel of 60 46 date, medium granuality advisable, among them when kibble, use 46 36 date, size, essence of life is ground with 60 granuality. Grind to apply to kibble and essence at the same time, use date or 60 46 size. Bond: Grinding stainless steel asks emery wheel has higher strength, so that bear bigger concussion load. Heat-resisting of bond of pottery and porcelain, fight corrode, the emery wheel that makes with it can hold cutting property well, do not be afraid of moisture, and have porous, agree with the bond of emery wheel of stainless steel of the grinding that make. Grinding is able to bear or endure the Kong Shi inside the material such as stainless steel of thick nitric acid, can use colophony bond to make emery wheel. Hardness: Should choose the emery wheel with inferior hardness, in order to rise from acute sex. Choose the emery wheel of hardness of G ～ N commonly, use with K ～ L among them most general, use microcrystalline corundum to make abrasive inside the circle grinds emery wheel, criterion with J hardness advisable. Organization: Jam to avoid the emery wheel in grinding process, emery wheel organization should be chosen more loose, choose 5 ～ commonly 8 relatively appropriate. When 17 grinding stainless steel how to choose grinding dosage? The speed of emery wheel of bond of pottery and porcelain is 30 ～ 35 M/s; The emery wheel speed of colophony bond is 35 ～ 50 M/s. When discovering exterior burn, should fall emery wheel speed to 16 ～ 20 M/s. Workpiece speed, when workpiece diameter is less than 50 Mm, n=120 ～ 150 R/min; When be more than 50 Mm, n=40 ～ 80 R/min. When the circle outside using emery wheel undertakes flat essence of life is ground, workbench motion speed is 15 ～ commonly 20 M/min, 5 ～ are when kibble 50 M/min. Grinding deepness and transverse feed hour take big cost, small cost is taken when transverse feed is big. Kibble deepness is 0.
04 ～ 0.
08 Mm, essence of life grinds deepness for 0.
01 Mm. Grinding deepness should be reduced after nap emery wheel. Outside when round grinding fore-and-aft feed, it is when kibble (0.
2 ～ 0.
7)B Mm/r, when essence of life is ground, be (0.
2 ～ 0.
3)B Mm/r; Inside when round grinding fore-and-aft feed, it is when kibble (0.
4 ～ 0.
7)B Mm/r, when essence of life is ground, be (0.
25 ～ 0.
4)B Mm/r; Round plane grinds transverse feed outside emery wheel, when kibble (0.
3 ～ 0.
7)B Mm/dst, when essence of life is ground, be (0.
05 ～ 0.
1)B Mm/dst. What should notice when 18 grinding stainless steel? Should seasonable nap emery wheel, the emery wheel when kibble wants nap a few thicker, the emery wheel when essence of life is ground should keep sharp from beginning to end, lest overheat burn. Two side corner is in the emery wheel after nap, do not allow hairiness to prick existence. When grinding of low surface surface roughness, wide choice grinds part of one's job not to undertake, essence of life grinds surplus to stay commonly 0.
05 Mm is advisable, workpiece outfit can stay when clip error is big 0.
1 Mm. In grinding process must cool adequately, many grinding is heated up and undertake in order to take away eroding, prevent emery wheel to jam with workpiece surface burn. Cooling fluid must clean, cannot interfuse wears bits or arenaceous bead, lest pull workpiece hair. The cooling fluid of grinding stainless steel, choose the emulsion with cool better performance commonly, or with contain extremely press additive and the cooling fluid with exterior small pulling force. Discharge is 20 ～ 40 L/min, 80 L/min is when emery wheel diameter is big. Surplus of stainless steel grinding should be taken a few smaller, outside when round grinding, the grinding surplus on the diameter is 0.
15 ～ 0.
3 Mm, essence of life grinds surplus for 0.
05 Mm. Inside the surplus of round grinding and outside round grinding is basic and identical. When planar grinding, the part with small, good tigidity is accumulated on, unilateral leaves surplus for 0.
15 ～ 0.
2 Mm, the part with rigid difference, large area, unilateral leaves grinding surplus 0.
25 ～ 0.
3 Mm. What does the example of 19 treatment stainless steel have? The use of stainless steel is very extensive, the example that cutting machines is very much also, cite the example that a few cutting machine only here, in order to offer reference. Turning: Workpiece material is 1Cr18Ni9Ti, work measure is 720 Mm of Ø900 Mm × . Use lathe tool of YG8 hard alloy formerly, 18 ° of ～ of ° of G0=15 of parameter of cutting tool geometry, 8 ° of A0=6 ° ～ , kr=75 ° , ls=-5 ° ～ - 8 ° ; Cutting dosage is Vc=28 M/min, ap=0.
3 ～ 0.
5 Mm, f=0.
16mm/r, one knife wants car of essence of life blade grinds lathe tool 28 times, and workpiece surface receives knife mark very apparent. Convert after lathe tool of YG8N hard alloy, except raise cutting rate 42.
Outside 4m/min, other condition is same, fine vehicle the circle outside one knife, need to grind a knife 5 times only, ra is workpiece surface surface roughness 3.
2 μ M, the mark that receive a knife is not apparent also. Car whorl: Workpiece material is 1Cr18Ni9Ti, whorl norms is M20 × 2.
5. Use YG8 hard metal formerly, vc=10 M/min, f=2.
5 Mm/r, ap=0.
3 ～ 0.
4 Mm, cutting tool blade is ground cannot machine. Convert 813 hard alloy, below the condition of Vc=36 M/min, can machine two above, efficiency and cutting tool durability can raise double above. Milling: Workpiece material is Cr17Ni2, milling plane, cutting dosage is Vc=90 ～ 100 M/min, ap=3 ～ 4 Mm, af=0.
15 Mm/z. Cutting tool is but dislocation carries milling cutter, cutting tool material is YW4, parameter of cutting tool geometry is G0=5 ° , a0=8 ° , kr=75 ° , ls=5 ° . Cutting tool durability is 41 Min. Bore hole: Workpiece material is 1Cr18Ni9Ti, cutting tool material uses YG6 and YG10H hard metal formerly, parameter of cutting tool geometry is G0=20 ° , a0=8 ° , kr=75 ° , ls=-3 ° . Cutting dosage is Vc=20 M/min, ap=3 Mm, f=0.
32mm/r. Below same condition, the cutting tool durability of YG6 is 15 Min, and ceaseless bits and stick a knife, the cutting tool durability of YG10H is 60 Min, and cutting quality is good. CNC Milling CNC Machining