The appearance of mould in Guangdong mechanical processing plant can be traced back to the pottery and bronze casting thousands of years ago, but its large-scale use has developed with the rise of modern industry.
In the 19th century, with the development of ammunition industry (cartridge case of gun), watch industry and radio industry, stamping die was widely used. After the Second World War, with the rapid development of the world economy, it has become the best way to mass produce household appliances, automobiles, electronic instruments, cameras, clocks and other parts. In the world, the stamping technology of the United States was at the forefront at that time. Many advanced die technologies, such as simple die, high efficiency die, long life die and stamping automation technology, mostly originated in the United States; The fine blanking technology in Switzerland, the cold extrusion technology in Germany, and the research on plastic processing in the Soviet Union are also in the advanced ranks in the world. In the 1950s, the focus of mold industry was to make molds that could meet the requirements of customers.
Guangdong mechanical processing plant mold design is mostly based on experience, refer to the existing drawings and perceptual knowledge, lack of real understanding of the function of the designed mold parts. From 1955 to 1965, it is the era of exploration and development of pressure processing. The function and stress state of the main parts of the die are divided into mathematical bridges, and these knowledge are continuously applied to the field practice, which makes the stamping technology develop rapidly in all aspects. The result is to summarize the mold design principles, and make the pressure machinery, stamping materials, processing methods, plum structure, mold materials, mold manufacturing methods, automation devices and other fields a new look, and to promote the direction of practicality, so that the stamping process from the instrument can produce excellent products in the first stage.
In the 1970s, it entered the second stage of high-speed, start-up, precision and safety development. In this process, a variety of high-efficiency, commercial life, high-precision multi-functional automatic calibration tools are constantly emerging. Its representative is as many as other multi station progressive die and more than ten station transfer die. On this basis, the bending machine, which has both continuous stamping station and multi slide forming station, has been developed. During this period, Japan stood in the forefront of the world - its mold processing accuracy has entered the micron level, mold life, alloy tool steel mold has reached tens of millions of times, cemented carbide steel mold has reached hundreds of millions of times, P stamping times per minute, small press is usually 200 to 300 times, the highest is 1200 to 1500 times. During this period, in order to meet the needs of fast product renewal and short service life (such as automobile modification, toy renovation, etc.), various economic molds, such as zinc alloy mold, polyurethane rubber mold, steel sheet stamping die, etc., have also been greatly developed.
From the mid-1970s to now, it can be said that it is an era of continuous development of computer-aided design and manufacturing technology. With the continuous improvement of the precision and complexity of mold processing, the production cycle is accelerating, and the requirements of the mold industry on the quality of equipment and personnel are also improving. Relying on ordinary processing equipment, experience and technology can not meet the needs of mold production. Since the 1990s, mechanical technology and electronic technology have been closely combined, and NC machine tools have been developed, such as digital control wire cutting machine tool, CNC EDM machine tool, CNC milling machine, CNC coordinate grinder, etc. The CNC machine tool which is automatically programmed and controlled by computer improves the efficiency and range of the CNC machine tool. In recent years, a NNC system has been developed, in which a computer directly manages and controls a group of NC machine tools in a time-sharing manner.
With the development of computer technology, computer has gradually entered various fields of mold production, including design, manufacturing, management, etc. The International Association for production research predicts that by the year 2000, drawings, as a means of communication between design and manufacturing, will lose their main role. The most fundamental point of mold automatic design is to establish mold parts standards and design standards. In order to get rid of the past design method centered on people's thinking judgment and practical experience, it is necessary to serialize, digitize and digitize the past experience and thinking method, and store them in the computer as design criteria. Because the components of the mold are different, it is almost impossible to develop a design software that can adapt to various parts. However, the shape of parts of some products does not change much, and the mold structure has certain rules, which can be summarized. Guangdong machining factory provides software for automatic design. For example, the CDM system of a Japanese company is used in the design and manufacture of progressive die, which includes the input of part graphics, blank unfolding, strip layout, determination of template size and standard, drawing of assembly drawing and part drawing, output of NC program (programming for CNC machining center and WEDM), etc. the time used is reduced from 20% by hand and the working time is reduced to 35 hours; Since the early 1980s, 3D CAD / CAM system has been used in automobile panel dies in Japan. At present, it has reached a high level in the aspects of scanning input of solid parts, drawing line and data input, geometric shape, display, drawing, marking, automatic programming of data, generation of post-processing files of control system of effective control machine tools, etc; Computer simulation (CAE) technology has also made some achievements. At a high level, CAD / CAM / CAE is integrated, that is, the data is unified, and information can be transmitted directly to each other to realize networking. At present, only a few foreign manufacturers can do it.