Shovel the CAD of tine figuration milling cutter
- source:TECHEN CNC Machining
R And Coordinate Points Of The Offset Wor Kpiece Contour Are Deduced of κ of The Formulas For Calculating.
The Examination Formula Of Relief Grinding Interference Is Replenished.
An Applying Example Of The CAD System Is Given.
Keywords: Milling cutter of figuration of of Relieving Form Cutter CAD Face can complete the milling treatment of workpiece figuration surface, the validity of its blade form is having conclusive effect to the appearance of workpiece surface, precision and surface roughness. The blade form design of figuration milling cutter depends on the appearance of workpiece, the random law sex as a result of workpiece profile and the diversity with figuration phyletic milling cutter, watch, computation and plot workload are checked when the design big and the program is trival. As a result of the similar sex of different specifications cutting tool, the repeatability labor in the design is many also. For this, the author developed straight chamfer of a treatment to use the CAD system of milling cutter of the figuration that shovel tine on personal computer. This system uses seesaw pattern to devise a method, need to input workpiece profile and the parameter that a few needing only, outstanding machine conversational mode, the overall design that can complete a shovel to age knife face design, structure designed figuration milling cutter to be generated to working plan once upon a time works. Edit software through other, still can undertake modification to designing data. One, of the system form, applied environment and module function 1.
What the system makes system of CAD of milling cutter of the figuration that shovel tine is overall if the graph is shown 1 times,form block diagram. Graph system of CAD of milling cutter of figuration of 1 shovel tine is overall form block diagram 2.
Applied environment system uses C language to regard as advocate control a process (interface) the design language with computational program, plot program uses Autolisp language, the operating system is Windows95 platform, the editor software that uses Windows95 to offer undertakes the program edits, use AutoCADR13 to debug plot program. 3.
Module function (1) advocate accuse module what this module is a system is total attemper program, the different statement that it can issue according to the user chooses corresponding function. (2) before the profile that module of knife face processing machines as a result of figuration milling cutter each are not normally identical and random law, because this ages to the shovel the general CAD system of figuration milling cutter, face of the knife before needing to use handles module to be made handle by treatment profile to workpiece, in order to gain profile of face of the knife before the basic parameter with original indispensible design is reached. This processing process is a making function that uses AutoCAD to offer, rotate workpiece profile (slant buy) , outspread hind, make special piece stock disk, for be being called when plot, the data that needs computational program and program plot place need data to stock disk data file. When the design, requirement user inputs workpiece to be asked by treatment profile and other to the middle of this module above all, input coordinate of reference point of tool cutting edge angle of two end points next. The implementation of this module function can divide for the following measure: Computation of tool cutting edge angle; Tool cutting edge angle of two end points is reached quite slant buy horn computation; Workpiece profile slants the coordinate after buy is decided really; Two end points are outspread; Milling cutter tooth form nods width and depth size computation each; Data processing and memory; Before knife face piece make. (3) when the structure designs module to use this module, the user needs to input the horn before milling cutter only, the width that tooth form nods each and depth size criterion by before numerate in the data file of module of knife face processing, the others data is calculated according to classics of data of experience formula, experience by the computer or choose to reach, undertake examining according to all sorts of calculation methods school nucleus, store again in data file. (4) plot module this module can pursue according to designing result scale cutting tool to work, tag dimension, public errand and technical requirement automatically. To before before the knife two kinds of circumstances of horn, will 0 before horn serves as before horny special case will handle, do not want other program. This module is open mode construction, after graph scale is finished, the job does not quit AutoCAD plot position, the user can ask to undertake modification to working plan at any time according to treatment. 2, the length of derivation be confined to with formulary computation, the coordinate that the computation of tool cutting edge angle in module of processing of face of the knife before the article is only right nods after deflexion of profile of formulary, workpiece is calculated the shovel in module of formula and structural design grinds formula of interference desired result to undertake derivation. 1. The computation of tool cutting edge angle falls in AutoCAD condition, the computer affirms the tool cutting edge angle of two end points is relatively difficult automatically, need to input coordinate to nod via interactive means, the computer has consideration according to inputting bit of coordinate. (1) the computation of tool cutting edge angle of left end points asks according to machining condition and milling craft, workpiece profile left end points divides kind of case in all, if pursue,2 are shown. Among them A, B is profile sunken circumstance, c, D is the circumstance of the protruding on profile. The X in the graph, y is user coordinate department, α is horizontal the included angle that connects a line with left end points and reference point of tool cutting edge angle (by Autolisp the command is decided) . Become by curve and straight group as a result of profile, when reason inputs reference point of tool cutting edge angle (nod at another o'clock for Zun Duan) have two kinds of kind: If profile is linear, input the either outside be being nodded except Zun Duan to nod; If profile is circular arc, input the centre of a circle. By the graph 2 can get: In A: κ R= α - 3 π / in B of 2 : In C of of of κ R= α : κ R= π / in D of of 2- α : κ R=2 π - α pursues 4 kinds of circumstances of Zun Duan of 2 workpiece profile (2) the computation of tool cutting edge angle of right end points is Alexandrine, the tool cutting edge angle of workpiece profile right end points also divides kind of case, if pursue,3 are shown. Among them A, B is profile sunken circumstance; C, D is the circumstance of the protruding on profile. Graph 4 kinds of circumstances of right end of 3 workpiece profile by the graph 3 can get: In A: κ R=3 π / in B of of 2- α : κ R= π - in C of α : κ R= α - π / in D of 2 : κ R= α - π 2. Workpiece profile slants the coordinate after buy sets workpiece profile to slant certainly the coordinate department before buy is Oxy, slant the dot coordinate before buy is (X, y) ; Slant the coordinate department after buy is ′ of Y of ′ of O ′ X, slant the dot coordinate after buy is (X ′ , y ′ ) ; Slant buy horn is β (β > 0 ° ) or β ′ () of β of β ′ =- . (1) when 0 ° of β ＞ , if the graph is shown 4 times, β of =-AB=-(AE+BE)=-ADcos of ′ of X of of of Y=OD of of of X=-AD having - β of =-ADcos of DF - β of ODsin β =Xcos - =ODcos β of of of F-DE of F-BF=O ′ of ′ of B=O of ′ of =O of ′ of Y of of Ysin β - β of ADsin β =Ycos + Xsin β pursues 4 slanting, if the graph is shown 5 times, ′ of β of =-ABcos of of of =-AD=-(AF-DF)=-AF+BE of ′ of X of of of Y=OB of of of X=-AB having + ′ of β of =Xcos of OBsin β ′ + β of =Xcos(- of of of Ysin β ′ ) + Ysin(- β ) =Xcos β - =OBcos of of of D=OE+ED=OE+FB of ′ of =O of ′ of Y of of Ysin β β ′ , no matter slant,buy horn is horn or negative horn, the expression homogeneous phase of X ′ and Y ′ is the same as. 3. The shovel grinds interference desired result by document  know, the parameter that An of the Xb in producing the external diameter of the least emery wheel when interference to be type, Xa, Yb, Ya, α and other involve all with document  identical, computational principle is shown 6 times like the graph. Those who need compensatory specification is, a nods extremely horn is φ = π / Zkb nods extremely horn is θ B=2 π / the 1 B that causes by γ F nods Zk+ θ pole horny quantity is a graph 6 shovels grind interference desired result the computational principle sketch map of analytic law 3, applied example is confirm this, the article gives out to use example below. Workpiece profile slightly. The error allows after mill of figuration surface profile for 0.
1mm, exterior surface roughness asks to be Ra3.