The rapid development of TV Mould manufacturing technology has become an important component of modern manufacturing technology part. If mold CAD / CAM technology, laser rapid prototyping mold, precision mold forming, precision machining technology of mold, mold in the design of the finite element method, boundary element method to flow, cooling, heat transfer in the dynamic simulation technology, mold CIMS technology, has developed mold technology and CNC technology, DNM, cover almost all the modern manufacturing technology. ?
Modern mold manufacturing technology to speed up information-driven towards, increase manufacturing flexibility, agile manufacturing and the systematic integration of direction. ?
1. High-speed milling: the third generation of tooling ?
High-speed milling process not only has high speed and excellent machining accuracy and surface quality, but also compared to the traditional cutting of low temperature (workpiece only increased 3 ?), heat distortion, and therefore suitable for temperature and thermal deformation sensitive materials (such as magnesium alloy, etc.) processing; also due to cutting force is small, thin and rigid applicable to poor machining; rational use of tools and cutting parameters, enables hard materials (HRC60) and processing a number of advantages. Therefore, high-speed milling is still a hot topic at present, it has more agile, intelligent, integrated direction, became the third generation of modeling technology. ?
2. EDM milling and “green” product technology ?
Electrical machines from abroad of view, whether in performance, process indicators, intelligence, automation have reached a very high level, currently the new trend is for foreign electrical discharge milling (EDM machining technology) research and development, which is an alternative to the traditional processing of the cavity with the electrode forming the new technology, it is simple to use high-speed rotary tubular electrode for three-dimensional or two-dimensional contour machining (CNC milling, as the same), so no longer need to make complex forming electrode, which is obviously a major area of EDM development. ?
Recently, the company launched a EDSCAN8E Mitsubishi EDM machines have witnessed new progress. The machine can automatically compensate for electrode wear, the Windows95 machine developed for the specific CAM system, with AutoCAD and other common CAD linkage, and can carry out online accurate measurements to ensure high precision machining. To determine whether abnormal or incomplete processing of shape, CAM system can achieve simulation process. ?
Technological progress in the EDM, while the safety and protection EDM technology more and more attention, many electric machines are considered security technologies. Currently the EC has provided no “CE” mark of machine can not enter the EC market, while also increasing emphasis on the international market security technology requirements. ?
Currently, the main problem EDM machine is radiation harassment, because of its safety, environmental impact is greater, more and more attention in the international market, “green” products where, as the leading equipment mold processing machines EDM ” green “product technology, will be the next problem to be solved. ?
3. A new generation of die CAD / CAM software technology ?
At present, Britain, the United States, Germany and other countries and a number of universities and research institutes in China mold software development, with a new generation of die CAD / CAM software for intelligent, integrated, mold manufacturability evaluation and so on. ?
A new generation of software should be built from a mold die design practice have summarized a large number of knowledge. After a systematic knowledge and scientific order, stored in a specific knowledge base in engineering and mold can easily be invoked. In support of intelligent software, CAD is no longer mold of traditional design and calculation method of imitation, but under the guidance of advanced design theory make full use of experts in this field extensive knowledge and successful experience in the design result will have a reasonable and advanced. ?
Mold a new generation of software to three-dimensional thinking, intuitive sense to design mold structure, the generated three-dimensional structure information can be easily used to mold manufacturability evaluation and numerical control machining, which requires die software Parametric feature modeling, molding process simulation, numerical control machining process simulation and exchange of information and organization and management reached a considerable degree of perfection and a higher level of integration. To measure the level of the degree of software integration, not only depends on functional modules are complete, to examine whether these functional modules is to share the same data model, whether the formation of a unified global approach dynamic database
To achieve integrated management and sharing of information to support the mold design, manufacturing, assembly, inspection, testing and commissioning of the entire process. ?
Mold manufacturability evaluation function in the role of a new generation of die software is important, both for multi-program screening, but also on the mold design process, rationality and economic evaluation, and modify the basis for mold designers. ?
In the new generation of die software, manufacturability evaluation include mold design and manufacturing cost estimates for Assembly Evaluation mold, mold manufacturing process evaluation components, the die structure and formability evaluation. ? new generation of software should have features for assembly because the function of the mold assembly through the structure can only be reflected. Assembly-oriented design methods, the mold assembly is no longer a simple assembly of parts one by one, the data structure can describe the functions of mold, mold can define relationships between components assembly features, parts and components to achieve the association which can guarantee the quality of the mold.
4. Advanced rapid tooling technologies ?
1) Rapid Prototyping (RPM) developing very rapidly, China has reached international level and the progressive realization of commercialization. Has commercialized the world’s rapid prototyping technology mainly SLA (stereo lithography), LOM (layered split manufacturing), SLS (selective laser sintering), 3D-P (3D printing). ?
Tsinghua University, introduced the first American company 3D SLA250 (three-dimensional laser lithography, or photosensitive resin curing) equipment and technology and conduct research and development efforts over the years, many improvements, perfect, launched “M-RPMS-type multi- Functional Rapid Prototyping System “(with laminated object manufacturing-SSM, melt extrusion-MEM), which is China’s own intellectual property rights of the world’s only rapid prototyping process has two systems (national patent), has good cost performance. ?
2) multi-point forming technology is highly adjustable punch plate group instead of the traditional mold for forming another surface of advanced manufacturing technology, multi-point forming system for CAD / CAM / CAT Technology as the main means of rapid economic realize the automatic three-dimensional surface shape. Jilin Industry University assumed the non-die forming of the national key scientific and technological projects have been independently designed and manufactured with international advanced level of multi-point forming equipment. ?
The technology of China and the United States, Massachusetts Institute of Technology, Tokyo University, Tokyo Institute of Technology compared to the theoretical study and practical application of all in the lead is now moving to promote development in the application.
Three) resin stamping dies for the first time in the trial of domestic cars has been successfully applied. FAW Die Manufacturing Co., Ltd design and manufacture of 12 sets of resin molds for a new trial modification of small red car, the 12 sets of molds are the trunk, hood, front left-right sub-panels and other large complex covering parts of the drawing inside and outside Die for, the main features of the mold surface to CAD / CAM processing of the master model as a benchmark, using the Swiss Ciba forming high-strength resin casting, punch and die clearance of imported special wax and accurate control of die size and high precision , the manufacturing cycle can be shortened one-half to two-thirds
Manufacturing cost savings of about 10 million yuan (12 sets of molds). For our trial and small-volume production cars opened up a new way, is a national initiative. Swiss Ciba experts believe that up to 90 international standards. ?
5. The scene of the mold detection ?
Mold development, increasing demands on the measurement. Precision coordinate measuring machine, has long been subject to environmental constraints, rarely used in the production site. Basically, a new generation of coordinate measuring machine has a temperature compensation and the use of anti-vibration material, to improve the dust control measures, environmental adaptability and reliability, so that it can be easily installed in the workshop used to achieve the characteristics of the measurement site . ?
6. Mirror polished mold surface engineering technology ?
Mold mold surface polishing technology is an important part of engineering, mold manufacturing process is an important post-processing technology. Currently, the domestic mold polishing to Ra0.05?m polishing equipment, abrasives and abrasive technology, you can basically meet the need, but to throw to Ra0.025?m mirror polishing equipment, abrasives and abrasive technology is still in the exploratory stage. With the injection mold mirror large-scale applications in production, die mold polishing technology has become a key issue. As the domestic polishing technology and materials, there are still some problems
So fool the camera lens, such as injection molding, CD, VCD disc and tools for high transparency and a large part of the injection mold is still dependent on imports. ?
It is noteworthy that the surface of die polishing equipment and polishing process is not affected by the impact of technology, but also by the degree of mold material mirror This is not enough attention, ie, polishing itself constrained by the mold material. For example, 45 # carbon steel made with injection molding, the polishing to Ra0.2?m, the obvious visible defects, dropped, and can only continue to increase in brightness, while the roughness has no hope of improving it is the current domestic production in the mirror mold mold materials are imported, such as Sweden, a win 100 136, Japanese Datong PD555 other mirror can be satisfactory degree. ?
Mirror mold material is not only chemical composition problem, the main thing is when asked by vacuum degassing refining, argon protection ingot, vertical continuous casting and rolling, soft forging a series of advanced technology, so that mirror mold steel with internal defects, little impurities fine grain size, high dispersion, fine metal grain size, size distribution and a series of advantages, to achieve die steel polished to mirror the requirements.
Injection Mould, TV Mould