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Modern Die and Mould Industry has the tittle of the sun of industry. Generally,the Die and Mould market is in short supply in the world . The demand of maket remains at US $ 60 billion to 65 billion, meanwhile chinese die and mould industry has also ushered in a new round of development opportunity. In recent years, the gross output value of Chinese die and mould industry keep the annual growth rate of 13% (according to incomplete statistics, the domestic mould imports reached more than 600 billion in 2004 , and at the same time, the export worth nearly 200 billion ). By 2005, mold production is estimated at 600 billion yuan. The export of die and mould standard parts will grow from $90 million a year now to about $2 billion in 2005.As far as the auto industry, a model of antomobile requires thousands vice of mould, worthing millions of dollars, but when the car models are repalced, about 80% of the mouls need to be replaced. In 2003, Chinese automobile production and sales have exceeded 4 million; in 2004, annual sales estimatedly exceeded 5 million, and the production of passenger car will reach 2.6 million. In addition, electronics and communications products also have a very large demand of die and mould, which often account for over 20% the mold total market in developed countries. At present, there are more than 17,000 mould manufacturers in China, with more than 500,000 employees. In1999, China mold industrial output value reached 24.5 billion yuan. Among gross industrial output , there were two-thirds for their own production and use and one-third for sale. In gross output of die and mould industry, stamping mould design accouted about 50%, plastic mould about 33%, die about 6%, other types of mould about 11%.

Stamping is the forming method that rely on press and die to exert force on plank, strip, pipes and profile, producing deformation or seperation, finally obtaining the needed shapes and sizes of workpiece. Stamping and forging are both plastic processing (or pressure processing), which is collectively called as forging. Stamping blanks is mainly of hot-rolled and cold-rolled steel sheet and strip.

Among the world's steel, 60 ~ 70% of them are plates and most of which are made through the stamping products. Vehicle body, chassis, fuel tank, radiator, boiler drum, the container shell, motors, electric iron core of silicon steel, etc. are all processed by stamping. Instruments,

household appliances, bicycles, office machinery, utensils and other products in life, also contain a lot of stamping parts.

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Stampings are thin, uniform, light and strong compared with castings and forgings. Stamping can produce the workpiece with reinforced rib, ups and downs, and flange to improve its rigidity, which is difficult to manufacture by other method. As a result of precision molds,

precision parts up to micron level, and high repetition accuracy, the same specifications, we can stamp out of a hole, boss and so on.

Generally cold stamping parts do not need cutting, or only need a small amount of cutting. Hot stamping parts’s precision and surface state are below the cold stamping parts, but still better than the castings, forgings, because of its less cutting.

Stamping is a highly efficient production methods, using compound die, especially the

multi-task position progressive die, in a stamping press to complete the multi-channel processes, realizing the whole Automated production from the raw material coil, flattening, punching to forming, finishing. With high efficiency, good working conditions, low production costs, generally it can produce hundreds per minute.

Stamping are mainly classified by process, which can be pided into separate processes and forming process two categories. Separation process, also known as punching, its purpose is to make the stamping parts separated from the sheet along the contour lines, while maintaining the quality requirements of separate section. Forming process is intended to provide blank sheet with plastic deformation without breaking, getting the required shape and size of the workpiece. In actual production, it is often a variety of processes to be applied to a workpiece. Punching, bending, shearing, deep drawing, bulging, spinning,and correction are the several major stamping process.

Surface and the internal performance of sheet metal have a great influence on the quality of the stamping finished product, which require stamping material thickness precision, uniform; smooth surface, no spots, no scars, no scratches, no surface cracks; uniform yield strength, no obvious Direction; uniform extension rate; low yield ratio; low hardening.

In actual production, we often use the technology test similar to stamping process, such as deep drawing performance test, bulging performance test and so on to ensure product quality and a high pass rate.

The accuracy and structure of mold directly affect the forming and precision of stamping parts. The manufacturing costs and life of mold is an important factor in cost and quality of stamping.

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The design and manufacturing of mold need more time, which extende the production preparation time of a new stamping.

Standardization of the die holder, mold bases and guide and development of simple pieces of the mold (for small batch production), compound die, multi-task position progressive die (for mass production), and the development of quick die change equipment, can reduce the workload for stamping and shorten the preparation time, and can apply to reduce the workload and preparing time of the stamping production to, making mass production of advanced punching technology reasonably applied to many varieties of small batch pro …… 此处隐藏：15777字，全部文档内容请下载后查看。喜欢就下载吧 ……