【正文】 ners to improve the modeling process, with automatic feeding, automatic feeding device management chip and then the posite die in large numbers. After the introduction by the milling machine model, plaster, mold, or surgery can be reproduced the same physical shape of the mold core, so that the production of mold pound to facilitate deep care a lot, to ensure accuracy. 70 years later, using the slope Die Cutting processing. The punch (punch) and die cutting can be quenched and then assembled to replace the original production of Die Deformation need treatment for a correction of a plicated assembly process, the mold precision can reach . Can be said that this time the rapid development of China39。 exports amounted to $ 1,843,000,000, down %. By different types of mold. Import and export is still the highest plastic rubber mold, the amount of import and export accounted for % and %。 by export destination points, China39。 by export supply to points of export die mainly from Guangdong, Zhejiang and Jiangsu. Analysis of import and export prices from the mold. Export stamping die in 2009 $ 8, per ton price. Increased by % over the previous year。 plastic rubber mold of the average ratio of each set of imports and exports : l. Compared with the previous year, the gap is significantly reduced. China Mould Industry Association39。s normal production. The failure of the actual production of the phenomenon quite frequently die, die consumed in large quantities. Die There are three main failure modes: (1). Wear failure (2). Deformation failure (3). Brittle failure. Failure analysis of die, die using a variety of effective measures to prevent early failure, can greatly improve the die life. ⅷ. Rational design of die structureDie die structure is the key to durability, rigidity of the irrational structure likely to cause uneven distribution of poor and wall thickness, and surface defects (such as surface oxidation, decarbonization, cracks, scars) will affect the performance of mold material, resulting in die early failure. Mold design principle is to ensure sufficient strength, rigidity, concentricity, neutral and reasonable blanking clearance, and reduce the stress concentration produced by the mold to ensure parts meet the design requirements. Therefore, the main work of zero for the mold (such as the convex die, die) requested its orientation with high accuracy and concentricity. Structure in the design of blanking die, punch and die clearance reasonable selection is to ensure that the mold work, to extend die life is a key factor. Gap should be the ideal fracture of sheet metal punching, punch and die edge produced by edge cracks in a straight line, or punching the edge of the glitch will occur is not allowed to make a serious edge bonding, wear faster, thereby affecting the mold life. Die studies have shown that for: ensuring the quality of the workpiece under the premise of punching, blanking die blanking should be as large selection of clearance to reduce the blanking force, reduces wear on the mold so that it can improve die life. Factory motor stator and rotor of the silicon steel sheet is , the manual remended clearance is 4 ~ O. 07ram, thickness of about 8% to 14%. According to this gap, out of the stator and rotor piece burr, although can be controlled in the specified scope. However, the gap is too small, making the punch and punch the holes are between the blanking die and friction between the serious and cause the punch and die wall produces bonding, resulting in decreased die life. To improve the quality of salt tablets, extending tool life, the plant data and information at home and abroad, in practice, the die gap was tested to explore, demonstrate the gap is ~ O. 1 1 mm is most appropriate. Attention should be paid to improve the die mold process forging billet, eliminating the distribution network carbide strip and so that flow lines and impact the direction of vertical. Forging billets in order to fully break the carbide, it was distributed evenly dispersed form, should be changed to the high forging upsetting than the pull method. In the mold manufacturing process, we must strictly ensure the accuracy of the mold size and shape, to avoid leaving marks machining。s level of manufacturing industry is an important landmark. Requires further development of China39。s capability of independent innovation, promote and enhance the use of information technology, industrial manufacturing tooling technology, active use of high technology and advanced applicable technologies to improve the overall level of the industry. China39。s mold industry to promote technological progress to a new level, will be the development of China3