The application of cad/cam technology in modern mold production
mold industry is one of the foundations of industrial development. CAD/CAM technology is an important technical equipment in mold industry production. It is the core technology of a high value-added manufacturing technology, and it is also the golden field of automation and informatization integration. Its technical level is an important symbol of the level of national industrial modernization. Since the 1980s, CAD/CAM technology in China has developed with the characteristics of high technology and rapid renewal speed, which has greatly shortened the production cycle of molds, improved product quality, and enhanced the adaptability of enterprises in competition. It is the further optimization of mold design products by engineers and technicians using computersIn view of this, this paper expounds the application status of CAD/CAM technology in modern mold production from the application of CAD/CAM technology in cold stamping die, forging die, plastic die and die casting die
1. Application of CAD/CAM technology in cold stamping die
cold stamping die CAD, cam system generally includes five modules: system work management, process analysis, die structure design analysis, graphics system and engineering database. The main contents include: importing original drawings and original data; Part process setting and analysis; Determine the scheme; Scientific calculation and selection of press; Mold structure design, graphics processing; Export the corresponding NC machining program; Output process documents. Complete other related work
in the last century, CAD/CAM technology was used in the mold design and manufacturing of automotive panels, and achieved good economic results. Toyota Motor Corporation of Japan is the first to apply it to the mold design and manufacturing of automobile panels. The automobile company also uses the CAD/CAM system of automobile panels, including ntdfb and caderit design software and Tinca software for machining convex and concave dies, to design the body shape, body structure, die CAD, main model and die manufacturing and fixture processing . It is reported that since the system is put into use, the design and manufacturing cycle of Toyota's auto panel forming die is reduced by about 50%. Foreign countries have also developed special modules for die design of automotive panels on the ug-ii software platform, such as sheet metal design, body design, cover stamping process design and die structure design
in the late 1960s, the research on Progressive Die CAD/CAM began, and it was initially applied in the 1970s. The main functions in the early stage were strip layout, die layout, process calculation and NC programming, which were only used for simple blanking progressive dies with two-dimensional graphics. In the 1990s, the internationally famous Pro/E, ug-ii, cadd5, Solidworks MDT and others have been successively applied in the mold industry [31. Special modules for forming process and die structure design have been gradually introduced into the modules of gold part modeling, blank deployment, blank layout, die design and NC machining. In the 1980s, Shanghai Jiaotong University and Xi'an Jiaotong University successively carried out the research and development of progressive die CAD/CAM system. Huazhong University of science and technology has also developed the progressive die CAD/CAM software nx-pdw in cooperation with the American UGS company It has the function of automatic design and has been put into use as a commodity in 2003
to sum up, the application of CAD/CAM technology in auto panel dies and progressive dies and the development and application of CAD/CAM software play an important role in the production of cold stamping dies, which plays an extremely important role in shortening the whole processing process, optimizing the structure of cold stamping dies and improving the production efficiency of dies. Nowadays, many research institutions have also begun research in this area, and have made some achievements. For example, use UG/API, grip, and vc++ to simplify the NC programming of auto panel dies, bring classes and objects into the parameter definition, and establish an intelligent auto panel die and progressive die system. However, compared with developed countries, our country has weak self-design and development ability in vehicle models and molds, and we need to further establish the application of independent secondary development software in the automotive industry
2. Application of CAD/CAM technology in forging dies
in the 1970s, the application of CAD/CAM technology in forging dies began to be widely studied at home and abroad, and good results were achieved in process design, structural design and dynamic simulation. Most people develop the CAD/CAM system of forging dies with the help of axisymmetric forging dies, because the geometric shape of symmetrical forgings is simple and easy to describe and define, while the CAD/CAM system of long axis forging dies is difficult and not universal, Its design is far more complex than that of axisymmetric forging die [21. The CAD/CAM system of axisymmetric forging die has three design modules: forging, die forging process, and forging die structure, and one NC programming module. Forging design is mainly to design cold forging drawing and hot forging drawing, including the selection of parting surface, the supplement of machining allowance, the addition of fillet and the design of draft angle . The design of die forging process is to decide whether to adopt the pre forming process, how to adopt it, and how to choose the tonnage of forging equipment is]. The development direction of forging die CAD/CAM system is to further develop and implement the technology of unification and die standardization, and to be deeply applied in industrial technology and artificial intelligence technology
3. Application of CAD/CAM technology in plastic molds
according to different molding methods, plastic molds are divided into injection mold, compression mold, Shanxi Juhua 30000 ton aluminum based new material project officially started, hollow blow molding mold, etc., of which injection mold is the most widely used. Injection mold CAD/CAM technology provides powerful help to technicians from two aspects: first, scientific calculation and dynamic simulation of molds through CAE technology; The second is to optimize the CAD design of injection mold structure Simulation and graphic processing [61. The main contents of injection mold CAD/CAM are:
if the acetylene flame turns into a lasting blue when baking a certain part of the screw (1) establish a geometric model.
(2) mold cavity design.
(3) mold structure scheme design.
(4) selection of standard mold base.
(5) graphic processing.
(6) mold NC machining program generation.
(7) CNC machining
from the 1960s to 1970s, from the CAD system based on wireframe model to the CAD/CAM system with surface modeling as the core, and from the 1980s to 1990s, it is the successful application of solid modeling technology to the integrity of Feature-Based Parametric Solid and surface modeling technology, which lays a solid foundation for the adoption of CAD/CAM technology in plastic mold
at present, the CAD/CAM system of plastic mold has been successfully applied in domestic and foreign markets. For example, Pro/E and ug-iii-deas systems all have independent plastic mold design modules, which are used to design plastic mold, accurately establish the three-dimensional model of plastic parts in the computer, and then design the core and cavity according to the geometric characteristics of plastic parts, design the pouring system and cooling system, mold flow analysis, structural design, etc. At present, these software are widely used in plastic mold industry
with the rapid development of numerical control technology in China, the traditional machining process and technology can no longer meet the requirements of current numerical control technology. Numerical control code verification, simulation and optimization functions should also be used to shorten the mold production cycle to meet the requirements of modern numerical control technology
4. Application of CAD/CAM technology in die-casting die
die casting die CAD refers to the work in the process of die-casting process and die-casting die design, such as information retrieval, scheme conception, analysis, calculation, engineering drawing and document compilation, which are completed by computer technology. "Design" in CAD includes many disciplines. It is an activity of design link to complete analysis, calculation and engineering drawing with computer assistance
the main contents of CAD of die-casting die: according to the characteristics of geometric model and alloy type, the corresponding scientific calculation; Select appropriate die casting machine and material; Mold structure design (mainly the design of gating system, cavity insert, guiding mechanism, template and ejection mechanism); Finally, draw the mold drawing [71.
a typical three-dimensional die-casting CAD system [81, mainly including the following modules:
(1) calculation of die-casting process parameters.
(2) selection of die-casting machine parameters.
(3) design of gating system.
(4) design of parting surface.
(5) design of mold structure.
(6) Design of pushing mechanism
generally speaking, die casting die cam mainly includes die processing process design, NC programming, and Simulation of NC machining process. Cam mainly selects machining machine type, machining path formulation, simulation machining and other tasks. Numerical control technology is the core technology in cam. NC machining mainly includes: generating NC program; NC machining process. For example, the expert system of die-casting die design developed by Toyota in Japan, based on the expert system of database of design standards and technical information, carries out die-casting die structure design, sketch design, cavity design, process design, assembly drawing design, structure design, processing path formulation, simulation processing into numerical control program, numerical control processing process, etc. according to the part drawing
CAD/CAM of die-casting die and scientifically integrate the design and manufacturing of die-casting die, and carry out complete computer control, which greatly shortens the production cycle and optimizes the die design. It is an important means to ensure the quality and cycle of die production. Compared with foreign advanced technology, the CAD/CAM technology of die-casting die in China still lags far behind. In order to meet the needs of product innovation and improve product competitiveness, we should speed up the development of integrated CAD/CAM technology of die-casting die
safety and qualification can save a person's life
due to the increasingly fierce market competition and the diversification of people's demand for products, the speed of product upgrading is faster and faster. The advantage of adopting CAD/CAM technology is that the mold technology is intelligent and innovative. It is the development of mold technology that gives it infinite vitality, so that it can be rapidly developed and successfully applied, which greatly improves the mold quality, saves time, improves production efficiency, significantly reduces costs, and liberates technicians from high-intensity labor. The optimization design of CAD/CAM technology is unmatched in traditional mold production. Next, I will introduce the problems that should be paid attention to in the operation of universal experimental machine