High speed processing technique is the develops quickly new and high technology in current and mechanical manufacturing industry, in applying a mould extensively to make, can raise a mould to machine efficiency and quality greatly. The characteristic that machines from high speed sets out, discussed the course of general process designing of Cimatron software, the high speed that analysed this software machines a function to reach knife strategy, induced model the commonly used method of antrum model CNC Machining. The mould regards new product as pivotal tool of production, its design the payoff that makes new product development cycle increasingly with production. What develop as CNC Machining equipment and technology of high-powered treatment cutting tool is increasingly mature, application of high speed processing technique is made to the mould in, can raise a mould to machine speed greatly, reduce treatment process, shorten eliminated benchwork rehabilitate to work even, shortened greatly thereby the production of the mould is periodic. High speed treatment is having the special treatment craft demand that machines unlike the tradition, and the numerical control instruction of CNC Machining included all process, the numerical control that reason application machines at high speed is automatic process designing system -- , CAM system must can satisfy corresponding special requirement: (A)CAM system should have rate of very high computational process designing; (B) whole journey has been prevented automatically cut processing capability and examination of interference of automatic knife handle; (C) offers the rich treatment strategy that accords with high speed to machine a requirement; (D) feed rate optimizes processing function. Cimatron is the outstanding CAD/CAM software of manufacturing industry of mould of pattern of a range, provided whole modelling design, cartography, analysis and function of treatment process designing not only, and right model the whole production process of antrum mould, can offer a good solution, especially the treatment that its used what achieve formerly to be based on knowledge, automation NC and be based on knowledge of semifinished product remain the intelligent NC that 3 old techniques are a foundation, make its are become current most ideal model one of software of process designing of antrum model high speed. Cimatron of the following union is processing medium application actually, introduce its process designing process and right model method of treatment of antrum model high speed and strategy. 1 Cimatron machines process designing process to build a model to be able to pass Cimatron to have the model of the product directly, the CAD software that also can use other passes changeover of IGES standard format. Become the model form of Cimatron. Specific unit process of cargo bandling is: Application chooses in the DataInteface module of Cimatron -- , IGES -- , Read, igs file chooses in Input column, press Execute completes the transition of format of spare parts model namely. Build treatment coordinate department to enter Cimatron environment, open spare parts model, choice NC machines menu, the system hints the choice machines coordinate department, if nonexistent be about to build coordinate of a treatment is. Cimatron offers 4 kinds of methods to build treatment coordinate department, use the means that located at 3 o'clock normally. Build treatment coordinate department to must hold clip with logical spare parts means, convenient measure for the principle. The center that takes the appearance on the spare parts commonly is the origin that machines coordinate department. Cutting tool set is defined in the cutting tool in Cimatron very agile, chose course of a treatment, the system can judge the cutting tool that the requirement accords with in cutting tool library automatically, if the system uses the cutting tool that has used last time with respect to acquiesce; If do not have a system to show cutting tool defines menu automatically, the requirement defines cutting tool parameter. In be versed in the pace edits to edit a process in labor situation, in asking to decide what feature to be able to hold clip in, finish, arrange treatment order and use cutting tool, use certainly finally why to plant treatment means will finish these labor situations respectively. Chose way of a kind of treatment, object of need definition treatment, size range of pipe bent and treatment parameter (like rotate speed, feed, every cutting means of quantity, mental allowance, feed is mixed the) such as safe plane. After all sorts of parameter define each labor situation, finish the computation of contrail of cutting tool motion by software, can undertake machining emulation. When orbit is not ideal, can revise parameter afresh and have consideration. Below certain circumstance, undertake to orbit process designing also can obtain favorable result directly. After postposition handles the cutting tool contrail of all labor situation to generate, handle an order through appropriative postposition, turn to process G code. Module of treatment of 2 Cimatron high speed is analysed reach machining center of knife strategy high speed to have preview a function, when cutting tool needs to turn at high speed machining center can shift to an earlier date beforehand decelerate, finishing athletic rate raises again after turning. This one function of the machine tool basically is to avoid inertial concussion passes big, bring about thereby inertial be cut too or install. When the CAM system that using Cimatron undertakes numerical control process designing, what should assure contrail of cutting tool motion as far as possible is smooth with smooth. Additional, in high speed treatment, the athletic rate of cutting tool is very high, adoption cutting tool normally very small, because this asks to fixed cutting tool load carries in machining a process, avoid main shaft of machine tool of attaint of cutting tool overload. Cimatron provided a variety of treatment method and move knife means. Graph 1 helix takes a knife (the corkscrewed yarn treatment of Spiral Cut) outline. Screw type treatment is along what close outline does helix cutting downward, there is knife of advance and retreat among, cutting process lasts constant. After from working procedure mode administration list clicks CREATE-MILL-USR to click right key, click the Helicprf in NC folder. Dll, definition parameter can produce helix cutter track (graph 1) . Cycloidal outline is machined. Should choose Profile(outline) treatment can be recommended inside craft parameter interface choose TROCHOID high speed to take a knife. The advantage that chooses this kind of way is: Can ensure the machine tool challenges material of semifinished product of craft parameter purify with be being provided most, improve the cutting efficiency of the machine tool thereby. It applies to tall hard data (HRC50 above) narrow groove and model antrum is machined (the 2) that be like a graph. Graph 2 cycloid take a knife (Trochoidai Movement) pursues 3 in-house circular arc transfer move knife (graph of Inwards Tangengial Link) transfers between 4 annulus move knife (Arc Fit Rapid Moves) pursues the 5 NURBS between the layer transfer move (Connect Layer With Nurbs) moves distinctly treatment of the curved surface of knife strategy antrum. Working procedure mode chooses SRFPKT of curved surface antrum, the meeting inside interface of its craft parameter offers a HSM BET.
PASSES ON/OFF switch, choose ON and when ROUGH of make choice of or ROUGH + FINISH and PARALLELCUT, the interface can play a LOOPS INWARDS/LOOPSOUTWARDS/GOLFCLUB 3 kinds move the knife is politic (the 3) that be like a graph; Choose SPIRAL CUT, the interface can play an ALL CORNER: ROUND/LOOP(is like graph 4) . This kind of cutter track transfers what can implement part of knife course edge glossily, ensure the machine tool is in move feed of constant speed of the cutting tool in knife process, thereby the vibration of machine tool of effective slow down, happening that avoids the appearance such as cutting tool interference. Be based on knowledge wait tall (WCUT) treatment. In the interface of craft parameter foreword of WCUT, below ROUGH and condition of ROUGH + FINISH, choose WITHSTOCK and MIN.
WIDTH combines pushbutton, can judge semifinished product to measure and have intelligence 2 times rough machining. Below FINISH condition, choose the YES function in HSM BETWEEN LAYERConNECT YES/NO, NURBS is used to join glossily between treatment layer and layer (the 5) that be like a graph. Its advantage is to wait for the even area that machines curved surface and abrupt area to be identified automatically, make the surplus of finish machining evener, exterior quality is higher. The process designing strategy that high speed of model of 3 Cimatron antrum machines is in model milling of 3 axes numerical control machines antrum model spare parts in, from regular form semifinished product the spare parts to the front of finishing is handled is machined, treatment craft divides its milling to be machined for Ji Qinggen of rough machining, semifinishing machining, finish machining commonly. Rough machining can be used insert cut wait for treatment means, but etc tall (WCUT) milling is had surround efficiently the feed setting that cutting walks along Dao Jizhi to be able to be changed, have function of the treatment between distinctive layer at the same time, because this is the most commonly used rough machining method. Cimatron is had be based on function of knowledge of semifinished product remain, can become cutter track according to the circumstance a future life of semifinished product. Use WCUT/ROUGH regards semifinishing machining as working procedure, choose to machine the WITHSTOCK option in parameter, but phenomenon of comb-out empty knife, and the cutting load of cutting tool is more reasonable, orbit is fluenter. The SRFPKT in finish machining and WCUT/FINISH are most commonly used, accept the even scale that is bordering on horizontal to slope, it is better to use SRFPKT working procedure to undertake edge face machines the effect, and receive the abrupt face that is bordering on vertical plane to use WCUT/FINISH working procedure to machine the effect commonly to slope idealer. 4 last words as technology of high speed milling gain ground ceaselessly, more and more enterprises had begun to use this technology in producing practice, process designing is a among them decisive job, also be the job of a creativity. The high speed of sufficient mining and use Cimatron software processes process designing technique, make the attitude with life of high quality, efficient, longevity, small time limit for a project, low cost moves toward mould product the market, strive for larger space. CNC Milling