Car plastic pattern provides precision work of three-dimensional curved surface

Machine the dependability of the model. In light of the CAM software kernel that applies extensively from industry place, model of use STL triangle is trend of a kind of development, face of this kind of triangle piece geometrical parameter definition needs two parameter only, theoretic more on the safe side. 2.

Machine the uniformity of surplus of process semifinished product. When treatment of every working procedure begins, before the semifinished product surplus of working procedure obligate should be even, so that assure cutting load constant. 3.

What collision interference checks is easy with gender and dependability. Because Injection Mold Tooling antrum core is deeper and abrupt, method of every cutting tool before be being machined so all should undertake colliding interfering checking beforehand, the cutting tool that makes sure spent volume is short on one hand is machined as far as possible much area, the cutting that assures tall feed, high rotate speed even on the other hand is on the safe side. 5.

Cutting tool method should undertake optimizing, want to avoid the appearance of pointed horn, frequent inverting as far as possible, cut cut want a circle to arrange. 6.

The handling time of the program, every programme controll is in the life less than of cutting tool, change in order to facilitate cutting tool. Mr Liu Yuheng: The car is plastic now make a structure more and more complex, for can the finishing task of high quality, my company made strict craft evaluate regulations, used advanced software and treatment device. 1.

Craft evaluation. After technical personnel takes three-dimensional curved surface of the client to design blueprint, want to undertake machining evaluating to its above all, the cutting parameter of all sorts of cutting tool that stage of opportunity of the treatment craft that decides this product, treatment, treatment requires and cutting tool. Next, the design rationality of round to this structure of three-dimensional curved surface and craft horn undertakes evaluating, definite place chooses the optimal cutting length of cutting tool, and be in rough machining, medium the project such as the metallic remain quantity in treatment and finish machining process. Finally, according to the final result that evaluates to these projects, we make line of good treatment craft, undertake machining. 2.

Application software. The software product that at present my company basically uses has: UG, POWER-MILL and CIMATRON software. Use these software we can come true easily to have analysis, consideration to three-dimensional graph, make STL material, the treatment train of thought that tracks with material undertakes to workpiece incomplete makings keeps clear of reach treatment of horn of automatic Qing Dynasty, undertake keeping clear of to workpiece horn ministry, with whole milling of parallel of 90 ° horn has precision work finally, optimize cutter track. The sector height control after can ensuring workpiece is being machined so is in 0.

005mm less than, the treatment precision that assures workpiece and exterior surface roughness accord with the client's requirement. 3.

Machine equipment. In the treatment side that car plastic pattern has my company basically has opportunity of TOSHIBA dragon door new peak of mill of numerical control of height of machining center of machining center, HITACHI high speed, Taiwan, Taiwan and stage a batch of advanced treatment such as machine of scintilla of a pair of heads equipment. Rely on these equipment we can control general mould treatment precision in 0.

In 05mm. To the choice of cutting tool, I think cutting tool life is right treatment precision and the effect that machine quality are very main. My company has a strict treatment level, the reasonable allocation that what machine the precision, drives machine tool of motivation, promotion automation treatment that improves a machine tool, manpower and tool resource to assuring according to standardization exercise had indispensable effect, this also is our company what still can maintain good progress increasingly intensely today in competition is important assure. Gentleman of Ben Kun beyond: Mould material hardness is very tall, amount of general surface excision is larger, so the treatment of the mould, besides wanting to choose appropriate machine tool, the cutting tool that has chosen even and make reasonable technological process. It is with cutting tool exemple, the cutting rate of the cutting tool when finish machining is very high, cutting tool arrives at big cutting to estimate the place quickly by cutting hidebound position, can get bigger concussion load, cutting tool can happen rupture, attaint; Should arrive by area of bigger cutting surplus when area of lesser cutting surplus, as a result of,meet again of load force decrease suddenly and had happened to cut, mar workpiece appearance, affect workpiece quality. Accordingly, my company is being machined to car mould product in, semifinishing machining working procedure was arranged among the rough machining before heat treatment and follow-up precision work, aim to make workpiece surface surplus even, leave equal cutting amount for finish machining. Reporter: The precision of car mould and quality are the result that the user pays close attention to very much, because it is affecting the exterior quality of end item directly, so are you improving quality, make sure what particular way quality respect has? Predict Mr Xiang Ling: The quality of the mould and precision can produce very big effect to follow-up production. My company is controlling a respect to have very strict requirement and standard to mould quality. 1.

According to CNC cutting surplus different, machine treatment the process differentiates in detail for " rough machining " , " half rough cutter is machined " , " semifinishing machining " , " finish machining " , " polishing " , pass such fractionize, assured the product measure precision of each working procedure phase. 2.

To all parts that had completed precision work, we use advanced 3 coordinate to measure an instrument to want to undertake be metricaled accurately to its, if discovery machines dimension deviation to exceed a level, must undertake necessary do poorly done work over again is handled. 3.

We are in treatment process, control each technology segment strictly, avoid to use filling solder to undertake changing to mould face, because fill,solder craft causes paint easily with Pi Wen the exterior quality problem of the product. 4.

The most crucial is to try a model. Although software of very much emulation analysis undertakes an analysis accurately to mould quality now, but actual production environment is complex, must want to undertake trying a model to finished product mould, optimize mould quality ceaselessly through trying a model. Mr Liu Yuheng: The SPECLA confirmation that with Japan this field company rolls out is exemple, the goal that makes this book should let the reentry after each link that make gets affirming be made all right namely, its purpose is the academic size that the mould measure that lets be made and the product measure after trying a model approach a product indefinitely. Before my factory mould is made, technical personnel must make the treatment exercise instructor that makes a part, include: Before method of the cutting direction of cutting tool method, cutting tool covers step pitch of method of value, treatment, treatment, feed and rotate speed, treatment, place to installing, the standard part way of the validity that touchs cutting tool of the number, height to workpiece, treatment, order and workpiece, these all need to undertake affirming just can be machininged, ensure thereby treatment quality. Gentleman of Ben Kun beyond: Eligible product quality is our essential jumping-off place. My company is developing large pattern special attention a few big crucial demands: 1.

The receiving inspection of raw material. The quality of raw material is bad, greater work appears to be out of shape after can bringing about treatment, the precision that increases later period to match modular time to bring about a mould drops, crackle appears after material pledges bad serious situation is workpiece treatment, bring about workpiece craze to discard as useless finally, serious effect machines cycle. 2.

The numerical control machine tool that home machines is machine tool of half closed circuit and closed circuit machine tool normally. Because machine tool of half closed circuit is the feedback that according to machine tool guide screw corner coming back spends,will decide mobile way, machine tool of choice closed circuit is so opposite precision is taller, assure to having more quality of large and exact pattern and precision. The treatment of my company large pattern arrives in mould material normally hind, undertake rough machining, leave a few mental allowance. Right now workpiece can happen as a result of the action of internal stress be out of shape, and the intensity of interior of the material after cutting, hardness relatively the surface is low, the requirement that short of mould designs, right now material must have heat treatment, cleared internal stress, reduce workpiece to be out of shape refine grain, raise the intensity of material and hardness, let workpiece have better treatment performance, assure the final quality of workpiece and precision. Reporter: Shorten production cycle is to promote pattern company to answer one of the market, crucial factors that retain competition ability. Ask you to introduce, in shorten produce periodic field, your act? Predict Mr Xiang Ling: In link of traditional pattern treatment, treatment and benchwork floor-to-floor time are long, and if machine treatment cannot be machined the time that area grow in quantity can extend report to machine, this lengthens whole pattern to make cycle necessarily. But, contemporary car is plastic make model the range is more and more sophisticated, and precision demand is high, the application of machine treatment is restricted by end, want to strengthen the application that report processes necessarily. For example, waiting to car dashboard model when the Injection Mold Tooling with sophisticated range undertakes machining, conventional CNC milling treatment cannot have finished entire treatment content, accordingly, we must use report to machine a machine tool, the treatment content that through discharge treatment finishs the place such as appearance and the reinforcement such as horn of the Qing Dynasty on mould face, deep antrum. For this, how to reduce report effectively handling time, raise report to machine efficiency and quality, became difficult problem of a technology in workmanship. Be aimed at this one problem, my company passes iteration technical analysis, research and test, found the discharge with one efficient a complete set of to machine means, in shorten handling time and increase the respect such as treatment quality, obtained very great progress. 1.

Use combined-type electrode. 2.

Design and make and undertake all right, make pull use a design. 3.

Optimize CNC to take knife cutter track, treatment of milling of reasonable and tie-in CNC and EDM discharge are machined. Optimize cutter track, from control there should be pointed horn for program itself, do not appear as far as possible the frequent inverting, amount that reduces linkage axis as far as possible, circle undertakes suitably be cuttinged cutting a join to wait. And as process designing of cutting tool method optimize, CNC milling treatment also can receive more application, thereby cut treatment is periodic. Mr Liu Yuheng: My company is in shorten the mould made periodic respect adopt all sorts of measure: 1.

Promotion CNC machines actual strength, cutting tool of use TAB taper, add shrink mouth cutting tool, reduce the handling time of EDM. 2.

Enhance a power of the machine tool, the automation that enhances a machine tool machines degree, toshiba machine tool is used change a knife automatically (M06 T1) and be opposite automatically knife (G221H1) instruction. Use G984E2R0 according to machining means to differ at the same time.

Treatment of 02F0 high accuracy and G984E1R0.

2 high speed spend treatment to promote treatment speed and treatment precision. 3.

Make good clamping apparatus and tool, shorten the time that outfit clip pulls to express and touch number. 4.

Use treatment of versatile knife head, the position that will common long cutting tool cannot machine is machined on CNC come out, reduce the cost that make and shorten the treatment of EDM is periodic. 5.

When the design, leave cent of 40 ～ 50mm face to seal glue, the rest is made avoid empty, can improve treatment efficiency, shorten treatment is periodic. 6.

When designing a pattern, demand model is in wear-resisting piece, old plane is made heavy pressure piece, shorten the time matching a pattern of benchwork. 7.

Numerical control class plans strictly to delimit with Zhou Ji arrangement begins the work according to machine rig-month, manufacturing control follow-up tracks node, adjust a plan in time. 8.

When workpiece is machined, the setting predicts man-hour, by actual generation man-hour controls efficiency. 9.

Use workshop manages systematic software to control manufacturing schedule. Gentleman of Ben Kun beyond: Shorten cycle is the one big challenge that at present pattern company faces the market to compete, my company is this besides using high speed processing technique, also made rigid flow system. For example, CNC Machining should abide by: Of the program cutting an amount is by arrive greatly small; The choice of cutting tool by arrive greatly small; Same the program of each norms cutting tool weaves together as far as possible; Same kind of machine program of the requirement (the program that is like cent face, the program of product range) weave together as far as possible; Finally, after process designing is finished, the whole process of treatment should imitate in computer upper mould, operate in order to avoid by accident, if bump into a knife, cut too wait for a phenomenon. Ensure in the program without by accident hind work out workshop produces process card, extend workshop treatment. Reporter: In current production, what technology difficulty do you still have to remain to solve? Predict Mr Xiang Ling: Actual production case is complex, the technical issue that at present my company basically pays close attention to is, when the petty and complex modelling such as the mesh that machines hood of horn of similar door plank, discharge treatment difficulty is greater, time cycle is longer. Mr Liu Yuheng: Doing not have an any technologies is perfect, we can do can be to promote oneself technology the standard as far as possible only, processing technique of mould of prep close behind grows a pace. To my factory, the technical issue that at present we basically pay close attention to has: 5 axes processing technique and its process designing; After exterior cutting is finished, how to prevent material stress to be out of shape; Axis of EDM treatment Z increases scintilla digit to occupy how to assure; Dimension label is fiducial the optimal sex of the choice; When the design, how dimension of managing mould material; Fast refrigeration (50s) the design of carry water; The accuracy that the month plans reachs the rationality that machine stage arranges; The interior of employee communicates as seasonable as what coordinate sex and initiative. Gentleman of Ben Kun beyond: Cutting tool is the person that machine directly, itself of common cutting tool included the noncombatant duty of arbor and razor blade, want to have an out of tolerance among them only, the quality of treatment cannot assure; The coaxial of machine tool main shaft is spent also can affect treatment quality. The working condition that how monitors cutting tool better so is the problem that we pay close attention to mainly now. Additional, because mould production cycle is shorter and shorter now, the choice of high speed processing technique and applied cost also are the key that we pay close attention to. CNC Milling