Since the reform and opening up, with the support and guidance of the national industrial policy and a series of supporting economic policies, China's mold industry has developed rapidly, with the highest annual growth rate of 30%. The output value of China mold industry 1999 was 24.5 billion yuan, and by 20 10, the total output value of China mold industry was about112 billion yuan, of which plastic molds accounted for about 30%. In the future mold market, the proportion of plastic molds in the total mold will gradually increase. ?
According to Mr. Bright Lo, Secretary General of the International Mould Association, after more than half a century's development, the plastic mould industry in China has made great progress and the mould level has been greatly improved. In terms of large-scale molds, we have been able to produce 48-inch large-screen color TV plastic shell injection mold, 6.5Kg large-capacity washing machine complete plastic mold, automobile bumper and integral instrument panel plastic mold, and in terms of precision plastic mold, we have been able to produce camera plastic parts mold, multi-cavity small module gear mold and plastic packaging mold. For example, Tianjin Jin Rong Tianhe Electromechanical Co., Ltd. and Yantai Polaris I. K Mold Co., Ltd. produce multi-cavity VCD and DVD gear molds. The dimensional accuracy, coaxiality and runout of these gear plastic parts are required to reach the level of similar products abroad, and the latest gear design software is adopted to correct the tooth profile error caused by molding compression and meet the requirements of standard involute tooth profile. It can also produce an aviation cup mold with a thickness of only 0.08mm and a more difficult plastic door and window extrusion mold. The manufacturing accuracy of injection mold cavity can reach 0.02 mm ~ 0.05 mm, the nominal roughness Ra is 0.2 m, and the mold quality and service life are obviously improved. The service life of non-quenched steel dies can reach100000 ~ 300000 times, and that of hardened steel dies can reach 500 ~1000000 times. The delivery time is shorter than before, but there is still a big gap compared with foreign countries
In terms of molding technology, great progress has also been made in the innovation of multi-material plastic molding mold, efficient multi-color injection mold, insert replacement structure and core-pulling demoulding mechanism. The use of gas-assisted injection molding technology is becoming more and more mature. For example, Qingdao Hisense Mould Supporting Co., Ltd., Tianjin Communication Broadcasting Company Mould Factory and other manufacturers have successfully applied gas-assisted technology to 29 ~ 34 inch TV shell and some thick-walled machine moulds, and some manufacturers have also used C-MOLD gas-assisted software, which has achieved good results. Companies such as Shanghai New Press can provide users with gas-assisted molding equipment and technology. Hot runner molds have become popular, with some factories using internal or external hot runner molds exceeding 20%, and a few units using needle hot runner molds with world-advanced level. But overall, the adoption rate of hot runner is less than 10%, which is far from 50% ~ 80% abroad. ?
In terms of manufacturing skills, the use of CAD/CAM/CAE technology has reached a new level, and a considerable number of CAD/CAM systems have been introduced one after another, represented by enterprises that produce household appliances. For example, UG Ⅱ of American EDS Company, Pro/em engineer of American Parametric Technology Company, CADS5 of American CV Company, DOCT5 of British Deltacam Company, CRADE of Japanese HZS Company, Cimatron of Israeli Company, C-Mold of American AC-Tech Company, Although the introduction of these systems and software, such as MPA mold analysis software from Moldflow Australia, cost a lot of money, it has realized the integration of CAD/CAM in China's mold industry, which can support CAE technology to simulate the molding process such as mold filling and cooling, and has achieved certain technical and economic benefits, which has promoted and promoted the development of China's mold CAD/CAM technology.
In recent years, great progress has been made in the self-developed CAD/CAM system for plastic molds in China, including CAXA system developed by Huazheng Software Engineering Research Institute of Beihang University, HSC5.0 system for injection molds developed by Huazhong University of Science and Technology, CAE software and so on. These softwares have the characteristics of adapting to the specific situation of domestic molds, being able to be used on microcomputers and being low in price, which provides a good premise for further popularizing the invention of mold CAD/CAM technology.
In recent years, some new plastic die steels have been widely used in China, such as P20, 3Gr2Mo, PMS, SM Ⅰ, SM Ⅱ, etc. This has a direct and significant impact on the quality and service life of the mold, but the overall application is still very small. The standard mold base, standard push rod and spring of plastic mold are widely used, and some domestic commercial hot runner system components are introduced. However, at present, the commercialization level of mold scale in China is below 30%, which is still far from 70% ~ 80% in foreign advanced industrial countries. ?
According to Bright Lo's guess, the overall trend of the mold market is stable and upward. In the future mold market, the development speed of plastic mold will be higher than other molds, and its proportion in the mold industry will gradually increase. With the continuous development of plastic industry, it is not normal to put forward higher and higher requirements for plastic molds. Therefore, the development speed of fine, large, complex and long-life plastic molds will be faster than the overall development speed.
According to Bright Lo's analysis, in recent years, precision, large-scale, complex and long-life molds account for the majority. Therefore, from the perspective of reducing imports and improving the localization rate, the market share of such advanced molds will gradually increase. With the rapid development of the construction industry, various profile extrusion dies and PVC plastic pipe joint dies have become new economic growth points in the die market, and the rapid development of expressways has also put forward higher requirements for automobile tires, so the development of radial rubber tire dies, especially movable dies, will also be higher than the overall unified level; Replacing wood with plastic and replacing metal with plastic make the automobile and motorcycle industries have great demand for plastic molds. The household appliance industry will develop greatly during the Twelfth Five-Year Plan period, especially the demand for plastic molds for refrigerators, air conditioners, microwave ovens and other spare parts is great.
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