CA nicety casts the computer to assist a project

Time:2023-06-21 15:19:10
Click:108
source:XIMENG CNC Machining

1, foreword: Nicety is cast is to use but dissolve (frit) quality the method that the model makes cast shapes. The biggest advantage that nicety casts is the surface bright and clean, size is exact, and defect is process complex, manufacturing cycle is long, the factor that affects cast quality is much, ask to material and craft in production very severe [1] . In producing a course, the mould is designed and make occupy very long cycle. A complex Bao Bi the design of the mould needs one year with production likelihood or longer time. Of the progress as world industry and people living standard rise, the cycle of research and development of the product is shorter and shorter, the design asks to answer time weak point. Especially structural design needs to do some when revising, the mould of early days is made charge was wasted in vain with production time limit for a project. Consequently the mould is designed and make the bottleneck that makes new product development. The computer assists the development of the project, make the confluence of traditional industry and new technology becomes a possibility. Three-dimensional CAD is OK put the design from the solution in drawing drawing board, simplified greatly design process of the architect, reduce the odds that make mistake. And as shape quickly (RP) technology, especially craft of laser electorate agglomeration (SLS) develop [2, 3, 4] , three-dimensional model can carry RP equipment, rapid change casts needs prototype into nicety, broke the bottleneck that the mould designs. Additional explicit tradition is cast in, develop a new cast, craft finalizes the design need to pass a test for many times, fumble repeatedly, final basis the mould result of a variety of test program, the selection gives the foundry technology plan that can satisfy a design to ask. For many times try casting to want to cost a lot of manpower, material resources and financial capacity. Use simulation of caky process numerical value, can coach pouring craft parameter is optimized, forecast blemish amount and position, raise cast n effectively. CA nicety casts a technology to assist the computer project application cast a process to nicety namely in, be united in wedlock other and advanced cast a technology, will finish the research and development of complex product and trial-produce with high quality, low cost, short period. Current, use technology of CA essence casting, already finished the trial-produce of the crucial part such as a variety of spaceflight, aviation, enginery, obtain satisfactory result. 2, material and applicable of casting of essence of experimental method CA wait for a variety of alloy at alloy of stainless steel, refractory steel, high temperature, aluminium alloy. Three-dimensional model can use the three-dimensional design software such as IDEAS, UGII, PROE to undertake designing, craft structure and model changeover use MagicRp to have processing and repair, shape automatically in AFSMZ320 undertake prototype is made on the system, use fuse-element soak to undertake archetypal finishing, imitate of caky process numerical value uses PROCAST and narrow difference to divide software to have consideration. 3, the crucial question of CA nicety foundry technology and relevant technology discuss in recent years, the three-dimensional CAD design related to technology of CA essence casting, beg instead project, fast shape, gating system CAD, cast imitate of process numerical value (CPS) and special type are cast waited for monomer technology to obtain great progress, the taking of these achievement is compositive the formation of the technology of CA essence casting that change laid a foundation, promoted the swift and violent development of technology of CA essence casting and application. To make each monomer technology is used successfully at CA essence casting, must eliminate the interface between each other, these technologies organic ground union rises. The ＋ of advanced material of advanced design ＋ that accomplishs real significance to go up in product development thereby is advanced make. 3.

Of 1 three-dimensional model generate how to get the electronic data model with mathematical component with electronic documentation exchange, it is the first step with CA essence crucial casting. Wait for technical development as three-dimensional CAD software, converse project, this job becomes simple and fast. Here main introduction uses IDEAS to undertake entity builds model and the course that data changes. IDEAS9 is compositive three-dimensional build model and converse project to build modular module. Through MasterModeler module can get complex model, the parameter that can undertake complete geometric constraint already changes a design, the free innovation that can undertake aleatoric geometry and project are restrained again is designed; Curved surface design was offerred include variable to sweep sweep past, the modelling function of a variety of free curved surface such as attrib border curved surface. The information nodding the cloud that converse project Freeform can gather digitlization appearance undertakes handling, found a curve and curved surface, undertake designing, RPM can be generated to use a document directly after curved surface is generated, also can pass advocate the module that build a model undertakes handling. Change needs to become STL document after hypostatic file is generated in order to regard RP as the input of equipment. Transition should notice to choose to shape equipment name, choose SLA500 normally, trigonometry piece output precision is in 0.

005~0.

01 between. When using MagicRp to handle, should notice to multiply on 25.

4, get devising measure actually. 3.

The numeric imitate of 2 caky processes 3.

The numeric imitate principle of 1 caky process is cast is metal of a liquid state fills up model antrum, and amid is caky the process with refrigeration, included a lot of complex appearances that produce an effect to cast quality among them. Experience often relies on to evaluate a craft in actual production feasible. To a cast character, craft finalizes the design need to pass a test for many times, fumble repeatedly, final basis the mould result of a variety of test program, the selection gives the foundry technology plan that can satisfy a design to ask. For many times try casting to want to cost a lot of manpower, material resources and financial capacity. Cast although the process is very complex, accidental element is very much, but still abide by basic and scientific theory, be like hydromechanical, pass heat, metal physical strength of caky, solid learns to wait. Such, it is OK to cast a process abstraction becomes metal of the liquid state that seek solution flow, caky the issue that reachs temperature change, should be in namely given below initiative condition and attrib border condition, heat conducts the Fu Lixie that seek solution equation, play plasticity equation. The development of computer technology, make the numeric solution of process of the physics that seek solution becomes a possibility. Use simulation of computer numerical value, can be opposite the extremely complex description that casts a process to undertake ration. Pass abstraction of mathematical physics method, cast a process but the coupling that token becomes a few kinds of equation: 1, equation of heat energy conservation: 2 successional equation: 3 momentum equation: Commonly used numeric imitate method basically is finite calculus of finite differences, finite yuan of law. Finite model of yuan of maths of calculus of finite differences is simple, derivation understands simply easily, take up memory is less. But computational precision is general, when cast has complex and attrib border figure, the error is bigger, when stress is analysed, need to change the reseau that need branch into finite yuan reseau has consideration. Finite yuan law technology divides a principle to have consideration to unit according to changing, undertake unit and overall synthesis next, imitate precision is tall, can solve the cast problem with complex form. No matter use method of what numerical value, the numeric simulation software that casts a process should include 3 shares: Pre-treatment, intermediate computation and aftertreatment. Pre-treatment basically offers cast for intermediate computation, model the geometrical information of housing; Cast and model all sorts of physics parameter of housing and foundry technology information. The physical field that intermediate computation basically designs according to casting a process, provide computational model for numeric computation, forecast cast quality according to the relation of cast quality or blemish and physical field. The aftertreatment is to point to a computational earnings result expression of intuitionistic means of form of to in an attempt to comes out. Casting a process to shed calculative of field, temperature field is right when main purpose the arises possibly shrinkage cavity in cast shrinks the pine undertakes forecasting, optimize craft to design, control cast interior quality. Through undertaking casting the imitate of the process on the computer, can get field of each level cast temperature, shed field, stress field distributing, forecast the generation of blemish and position. Carry out contrast to a variety of technology program, choose best technology, can improve product quality considerably, raise product n. 3.

2, cast software of simulation of process numerical value [the research with 5] old course and development, there already were large quantities of one commercializations on the world cast software of simulation of process numerical value, it is mature to show this technology has tended. These software can be cast to sand mold mostly, metal mold is cast, nicety is cast and the craft such as die-casting undertakes temperature field, stress field is mixed shed the numeric imitate of field, the shrinkage cavity that can forecast cast, loose, crackle, be out of shape wait for blemish and cast the fibre of each place, and know exactly about sth of as hypostatic as CAD model seizes changeover port, can use hypostatic document at finite yuan of analysis. ProCAST is to apply what succeed quite to cast process simulation software at present. In development and production cast of complex, thin wall is mixed close clean model its effect can be produced especially in cast. It is current can undertake exclusively conducting heat to casting a process - flow - the system that stress coupling analyses. This software basically comprises by 8 big module: Finite yuan of reseau analyse cent, conduct heat analysis and around processing, analysis of going from place to place, stress analysis, heat radiation analysis, microstructure analysis, electromagnetism induction is analysed, beg solution to wait reversely. It can imitate casts problem of the great majority in the process and physical phenomenon. Be opposite the technology is filled model the analytic respect of the process, can offer a consideration gas, filter, high pressure, rotate wait to be filled to cast model influence, can compose imitate goes out disappear the model is cast, low Die Casting is built, of the almost all foundry technology such as centrifugal casting fill model process, right note model, press wax-pattern and suppress powder material to wait fill model the process undertakes imitate. ProCAST can be conducted to heat, convection and heat radiation conduct heat 3 kinds the problem undertakes begging solving, pass especially " law of grey body clean radiate " model, make it more be good at solving casting of essence of life especially single crystal casts a problem. Stress respect is used play plasticity and stick plasticity model, make its have capacity of analytic cast stress, metabolic. When undertaking an analysis to cast, simple model reseau can be generated in ProCAST directly. Complex model can be generated by the software such as IDEAS, differentiate * of the output after reseau.

File of Unv global trade, this file should contain node and unit information. Tetrahedral unit is outputted to be used at pre-treatment after Meshcast module reads in reseau file. PreCast undertakes to the model material, interface conducts heat, attrib border condition, pouring the parameter such as speed has a definition, finish computation by ProCAST module finally. Apply IDEAS and ProCAST, we undertook caky process imitate to some motor component. Because this component has measure of a direction thinner, pouring the process is extremely medium easy happening crackle and be out of shape, pass imitate, undertook optimizing to gating system structure, reduce stress concentration, prevent to be out of shape with craze, obtain apparent effect. Conclusion: 1, the CA nicety that auxiliary project and nicety cast the computer to be united in wedlock and be become casts a technology to have very strong versatility, can shorten development is periodic, managing development cost; 2, of IDEAS and RPOCAST cooperate, can be opposite complex undertake casting imitate of process numerical value; 3, caky imitate technology can use the computer Yu Fu is miscellaneous gating system is designed and optimize, and relatively can accurate forecast blemish to reach its the position, be out of shape craze tendency, be used at direct gating system optimize. CNC Milling CNC Machining