In recent years, the level of stamping dies in China has greatly improved. Large stamping dies have been able to produce a single set of molds weighing more than 50 tons. The cover molds for mid-range cars can also be produced domestically. Multi-position progressive die with an accuracy of 1~2μm and a lifespan of about 200 million times can be produced in many domestic enterprises. The precision die with surface roughness up to Ra 1.5μm, the large-size (Φ-300mm) precision die and medium-thickness precision die have also reached a high level in China.
Mold CAD/CAM Technology Status
China's mold CAD/CAM technology has been developed for more than 20 years. The precision die CAD/CAM system jointly completed by the former Huazhong Institute of Technology and the Wuhan 733 Factory in 1984 was the first self-developed die CAD/CAM system in China. The cold die CAD/CAM system, which was jointly completed by Huazhong Institute of Technology and Beijing Mould Factory in 1986, is the first blanking die CAD/CAM system developed by China. The cold die CAD/CAM system developed by Shanghai Jiaotong University was also completed in the same year. Since the 1990s, CAD/CAM technology has been used in the mold design and manufacture in the domestic automotive industry. The 863 Program of the State Science and Technology Commission plans to use Dongfeng Motor Corporation as a CIMS application demonstration plant. Huazhong University of Science and Technology is used as a technical support unit to develop an integrated system of automotive body and cover mold CAD/CAPP/CAM that was approved in early 1996. During this period, FAW and Chengfei Automotive Mold Center introduced workstations and CAD/CAM software systems, and applied them in mold design and manufacturing, achieving significant benefits. In 1997, FAW introduced computer simulation CAE software for the sheet forming process and began production.
Since the beginning of the 21st century, CAD/CAM technology has been gradually popularized. Now, stamping die enterprises with certain production capabilities have basically had CAD/CAM technology. Some key enterprises also have CAE capabilities.
Mold CAD/CAM technology has become a consensus for people to significantly shorten the die design and manufacturing cycle, reduce production costs, and improve product quality. During the "Eighth Five-Year Plan" and "Ninth Five-Year Plan" period, a large number of mold enterprises have popularized and popularized the computer graphics technology. The use of numerical control processing is also getting higher and higher, and a considerable number of CAD/CAM systems have been introduced one after another. Such as U.S. EDS UG, U.S. Parametric Technology's Pro/Engineer, U.S.CV's CADS5, U.K. DELCAM's DOCT5, Japan's HZS's CRADE and space-E, Israel's Cimatron, also introduced AutoCAD, CATIA and other software And special software such as Euclid-IS for Marta-Daravision in France for automotive and panel molds. Domestic car cover mold manufacturing companies generally adopt CAD/CAM technology. The design of the DL diagram and the design of the die structure diagram have all achieved 2D CAD. Most companies have already transitioned to 3D, and general map production has gradually replaced the production of parts drawings. And the parametric design of the mold also began to move toward the field of technology development of a few mold manufacturers.
In press forming CAE software, in addition to the imported software, Huazhong University of Science and Technology, Jilin University, and Hunan University have all developed higher-level software with independent intellectual property rights and have been successfully applied in production practice. Good benefits.
Rapid Prototyping (RP) is combined with traditional rapid economic molds to rapidly manufacture large-scale automobile panel molds, solving the problems of low-melting-point alloy molds that rely on sample casting molds, low mold precision, low precision of parts, and difficult production of prototypes. It realizes the rapid tooling manufacturing based on the 3D CAD model as the modeling basis, and guarantees the precision of the parts. It provides the automotive parts industry with rapid development of new models and rapid trial production of automotive parts. It indicates that RPM is used in automobiles. Trial molds for large body panels have been successful.
Around the automobile body trial production and the rapid manufacture of large-scale cover molds, some new rapid prototyping methods have also emerged in recent years, such as moldless multi-point molding, laser shock and electromagnetic molding that are currently applied in production. All of them show the advantages of reducing costs and improving efficiency.
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