【正文】 economic returns. Mold production industry is small and scattered, crossindustry, capitalintensive, professional, mercial and technical management level are relatively low. According to inplete statistics, there are now specialized in manufacturing mold, the product supporting mold factory workshop (factory) near 17 000, about 600 000 employees, annual output value reached 20 billion yuan mold. However, the existing capacity of the mold and die industry can only meet the demand of 60%, still can not meet the needs of national economic development. At present, the domestic needs of large, sophisticated, plex and long life of the mold also rely mainly on imports. According to customs statistics, in 1997 630 million . dollars worth of imports mold, not including the import of mold together with the equipment。s CDM system for progressive die design and manufacturing, including the importation of parts of the figure, rough start, strip layout, determine the size and standard templates, assembly drawing and parts, the output NC program (for CNC machining Center and line cutting program), etc., used in 20% of the time by hand, reduce their working hours to 35 hours。s, mold industry focus is based on subscriber demand, production can meet the product requirements of the mold. Multidie design rule of thumb, reference has been drawing and perceptual knowledge, on the design of mold parts of a lack of real understanding of function. From 1955 to 1965, is the pressure processing of exploration and development of the times the main ponents of the mold and the stress state of the function of a mathematical subbridge, and to continue to apply to onsite practical knowledge to make stamping technology in all aspects of a leap in development. The result is summarized mold design principles, and makes the pressure machine, stamping materials, processing methods, plum with a structure, mold materials, mold manufacturing method, the field of automation devices, a new look to the practical direction of advance, so that pressing processing apparatus capable of producing quality products from the first stage. 4 Into the 7039。s, the United States, Japan and other industrialized countries die industry output value has exceeded the machine tool industry, and there are still rising. Production technology, according to the International Association predicts that in 2020, the product best pieces of rough 75%, 50% will be finished mold pleted。 畢業(yè)設(shè)計論文 外 文 翻 譯 2 Die history 1 Die position in industrial production Mold is a highvolume products with the shape tool, is the main process of industrial production equipment. With mold ponents, with high efficiency, good quality, low cost, saving energy and raw materials and a series of advantages, with the mold workpieces possess high accuracy, high plexity, high consistency, high productivity and low consumption , other manufacturing methods can not match. Have already bee an important means of industrial production and technological development. The basis of the modern industrial economy. The development of modern industrial and technological level depends largely on the level of industrial development die, so die industry to national economic and social development will play an increasing role. March 1989 the State Council promulgated on the current industrial policy decision points in the mold as the machinery industry transformation sequence of the first, production and capital construction of the second sequence (after the largescale power generation equipment and the corresponding power transmission equipment), establish tooling industry in an important position in the national economy. Since 1997, they have to mold and its processing technology and equipment included in the current national focus on encouraging the development of industries, products and technologies catalog and to encourage foreign investment industry directory. Approved by the State Council, from 1997 to 2020, more than 80 professional mold factory owned 70% VAT refund of preferential policies to support mold industry. All these have fully demonstrated the development of the State Council and state departments tooling industry attention and support. Mold around the world 2 about the current annual output of 60 billion . dollars, Japan, the United States and other industrialized countries die of industrial output value of more than machine tool industry, beginning in 1997, China39。 metals, plastics, ceramics, rubber, building materials and other industrial products, most of the mold will be pleted in more than 50% metal plates, more than 80% of all plastic products, especially through the mold into. 3 2 The historical development of mold The emergence of mold can be traced back thousands of years ago, pottery and bronze foundry, but the largescale use is with the rise of modern industry and developed. The 19th century, with the arms industry (gun39。s to high speed, launch technology, precision, security, development of the second stage. Continue to emerge in this process a variety of high efficiency, business life, highprecision multifunctional automatic school to help with. Represented by the number of working places as much as other progressive die and dozens of multistation transfer station module. On this basis, has developed both a continuous pressing station there are more slide forming station of the press bending machine. In the meantime, the Japanese stand to the world39。 from Japan in the early 80s will be threedimensional cad / cam system for automotive panel die. Currently, the physical parts scanning input, map lines and data input, geometric form, display, graphics, annotations and the data is automatically programmed , resulting in effecti