Processing technique of mould of shallow analyse hardware reachs methodological application
- source:SHNMIN CNC Machining
Software is newest and finite state of equipment of flexible package of technical our country and yuan of development coating technology and the tatty of relation cutting tool that improve tool performance are small detect ear piece the development of treatment craft and industry of woodworker of tool our country and countermeasure steam engine generate electricity the technology is worth large area promotion is applied, prepare the geometrical outline of workpiece for semifinishing machining. Because of cut metal in cutting process area happening changes, bring about load of cutting tool susceptive to produce change, make cutting process not stable, cutting tool wears away speed is inhomogenous, treatment surface quality drops. A lot of CAM software that develop at present can pass the following arrange: The main goal of rough machining of rough machining mould is the material purify rate inside pursuit unit time, prepare the geometrical outline of workpiece for semifinishing machining. Because of cut metal in cutting process area happening changes, bring about load of cutting tool susceptive to produce change, make cutting process not stable, cutting tool wears away speed is inhomogenous, treatment surface quality drops. A lot of CAM software that develop at present can carry cutting condition through the following measure constant, acquire good treatment quality thereby. Constant cutting load. Achieve constant cut area and material purify rate through computation, make cutting load and cutting tool wear away rate keeps balanced, in order to improve cutting tool life and treatment quality. Avoid to change way of cutting tool feed suddenly. Avoid workpiece of cutting tool embedded. When be like treatment mould antrum, should avoid cutting tool perpendicular insert workpiece, and should use tilt means leaving a sword (commonly used banking angle is 20 ° ～ 30 ° ) , had better use the knife below screw type in order to reduce cutting tool load; When machining mould core, answer to cut work from the level after Dao Ran of the following outside workpiece first as far as possible. Cutting tool is cut, bend inclined should be used as far as possible when cutting a work (or circular arc type) cut, cut, avoid perpendicular cut, cut. Use climb cutting climbing type (Climbcutting) can reduce heat in metal cutting, reduce cutting tool to get force and treatment sclerosis rate, improve treatment quality. The main goal of semifinishing machining of semifinishing machining mould is to make level off of workpiece outline appearance, surplus of exterior precision work is even, this is attached most importance to especially to tool steel mould should, because it will affect the change of the change of area of cut of the cutting tool when finish machining and cutting tool load, affect the stability of cutting process and quality of finish machining surface thereby. Rough machining is to be based on volume model (Volumemodel) , finish machining is to be based on scale model (Surfacemodel) . And the CAD/CAM system that develops before is discontinuous to the geometrical description of the spare parts, after because do not have,describing rough machining, the intermediate information that the model processes before finish machining, the odd mental allowance of surface of reason rough machining distributings reaching the biggest odd mental allowance all is sealed. Because this answers,strategy of half-and-half finish machining makes optimizing have even odd mental allowance in order to assure surface of the workpiece after semifinishing machining. Optimize a process to include: The the computation of outline of rough machining rear wheel, computation of the biggest odd mental allowance, biggest the deciding that allows mental allowance, right odd mental allowance is more than the biggest allow mental allowance model face partition (the area that is less than radius of rough machining cutting tool like the radius blend such as groove, corner) and semifinishing machining. Existing mould high speed machines CAD/CAM software to have odd mental allowance to analyse a function mostly, can reach distributinging circumstance to use sound semifinishing machining strategy according to the size of odd mental allowance. If the HyperMill of OpenMind company and HyperForm software offerred bunchy milling (Pencilmilling) and odd milling (the method such as Restmilling) will keep clear of the odd mental allowance is bigger corner after rough machining in order to assure the mental allowance with follow-up even working procedure. The local milling of Pro/Engineer software (Localmilling) has similar function, the odd mental allowance that is like local milling working procedure takes value and rough machining equal, this working procedure keeps clear of only with milling cutter of a small diameter the corner that rough machining did not cut, undertake semifinishing machining again next; If take the odd mental allowance of local milling working procedure,the value serves as the odd mental allowance of semifinishing machining, criterion this working procedure can keep clear of not only the corner that rough machining did not cut, return achievable semifinishing machining. Newest development is by outside receive the computer and numerical control machine tool to join directly through RS-232C serial mouth, what have NC program directly is fast, accurate transmission, and outside the connection of photograph of numerical control machine tool that accepts the computer to be able to have system of same different perhaps control with much stage, undertake information is shared, the in producing a course information inside the numerical control section of a construction project that can manage much stage machine tool to comprise, in order to reduce manufacturing preparation, especially the preparative time of program of numerical control NC. As CAD/CAM, the maturity of compositive management software, and right flexible the addition of the demand of production system, the use of numerical control machine tool, use the computer from stand-alone the direction that compositive management is development of technology of manufacturing treatment industry. Be based on afore-mentioned problems of existence of machining course of study just about, and the adduction of new idea of CAD/CAM system new technology, MIS system, of ERP system introduce ceaselessly, further, the CIMS technology development in home, the information of workshop ground floor is compositive it is Chongzhongzhi is weighed. For this, we design those who developed the following introduction to be used at the workshop to process all sorts of products with compositive equipment. The strategy of high speed finish machining of finish machining mould depends on the osculatory dot of cutting tool and workpiece, and the contact of cutting tool and workpiece nods the curved surface slope as treatment surface and cutting tool to have effect radius change and change. To the treatment of complex curved surface that be combined by many curved surface and becomes, answer to have successive treatment in a working procedure as far as possible, is not right each curved surface undertake machining respectively, carry in order to decrease the frequency of next knife, knives. However the change as a result of slope of the surface in treatment, if define the side penetration of a cutting tool of treatment only,measure (Stepover) , cause what differ in slope possibly apparently actual step pitch is inhomogenous, affect treatment quality thereby. The method that Pro/Engineer solves afore-mentioned problems is to be in while definition side penetration of a cutting tool is measured, define height of area of treatment surface remain again (Scallopmachine) ; HyperMill was offerred wait for step pitch to machine (Equidistantmachine) means, can assure the amount of even side penetration of a cutting tool between cutter track diameter, and the restriction that does not accept exterior slope and curvature, make sure cutting tool bears from beginning to end in cutting process even load. Usually, 1 what the curvature radius of finish machining curved surface should be more than cutting tool radius.
5 times, in order to avoid the abrupt change of feed direction. In the high speed finish machining of the mould, cutting every time, when cutting a work, the change of feed direction should use circular arc as far as possible or the curve turns receive, avoid to use turn point-blank receive, in order to maintain the smooth stability of cutting process. Of feed speed optimize what at present software of a lot of CAM has feed rate adjust a function: In semifinishing machining process, lower feed rate when cut area is large, and cut area hour increases feed rate. Those who use feed rate optimize adjust can make cutting process smooth, improve treatment surface quality. The size of cut area is calculated automatically completely by CAM software, the adjustment of feed speed can be installed by the user according to machining a requirement. CNC Milling CNC Machining