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256. Electrochemical plating of the plastic molds

Since the 90s of the 20th century, the global economic recovery, and showed accelerating growth momentum, global production and sale of the plastics industry also has shown a steady growth trend. It is predicted that in 2007 the global plastics demand will reach 200 million l million tons in 2020 to reach 300 million 8 million tons. Plastic as the foundation of modern social and economic development one of the materials have been widely applied to various fields of national economy, and steel, wood, cement, the four pillars of a material field. Therefore, the research and development of plastic molding technology is of great engineering significance. Plastic mold plastic molding process is one of important equipment, in the manufacture of plastic products play an important role in the process, direct impact on the quality and performance plastic products. With the plastic molds to the small, sophisticated, diverse and large, complex, precision direction, the growing complexity of its manufacturing process, long production cycle, production costs are high I. Most of precision molds, especially from foreign imports, the price is very high, and fewer types of standard accessories. If early failure, will give companies a significant economic losses. So desperately need a convenient way to mold the metal fill up, to restore a good way to mold surface.

In practice, there are several options available. Using the earlier method is welding process. Welding adhesion is very good, but contains a lot of the oxide layer welding, and welding inevitably produce stress in the metal, resulting in thermal deformation or cracks. The process is relatively new spark or plasma spraying process, this process fast and convenient method can be formed on the surface in parts 2 5.4mm thick metal, alloy, metal oxide or carbide layer. However, this process equipment is expensive, and the adhesion of deposits often need to follow the general machining, sediment often contains more holes. In recent years there has been a new type of metal deposition process, commonly used in the processing area of l m2 about sediment thickness l "m to lmm or so, mainly used in high-quality metal deposition of the occasion required, this method is called electrochemical plating process. a basic principle of the electrochemical plating and Features