2. Design and Manufacture Technology of Large and Precision Stamping Dies

Large-scale and precision die has always been an important development trend. The stamping technology of high-strength sheet metal and laser welded sheet metal with unequal thickness has become more and more popular. The hot stamping technology of high-strength sheet metal and the stamping technology of large-scale aluminum alloy sheet metal have been increasingly applied in automobile production. Because of the higher and higher speed of high-speed punch, the foot spacing of integrated circuit has become more and more compact, and the precision of connector has been Ultra-precision machining is developing further because of its higher and smaller size. However, at present, the moulds of middle and high grade cars above B grade and ultra large scale integrated circuits and precision electronic products are mainly imported. The large multi-station progressive dies for automobile parts have just started. The hot stamping forming of sheet metal and its die technology have just started in China, which is basically blank. The technology level of die production has become an influence on the autonomy of automobiles and high-grade electronic products in China. The important factor of improving innovation ability. The improvement of production technology of large and precision stamping dies can not only improve the performance and independent innovation ability of automobiles and high-end electronic products, but also improve the overall level of the die industry.

According to reports, the main key technologies included in this technology are: production technology of large automobile panel die; production technology of large multi-station progressive die for automobile parts; production technology of cold stamping die for high strength plate and unequal thickness welded plate; hot pressing forming and die production technology for high strength plate; production technology of fine stamping die for thick plate; die with precision of 0.001 mm, with lead pin over 100 and spacing of 0.15%. The lead frame under mm and the matching die for VLSI are precise micro-connectors with accuracy higher than 5 micron, motor cores with large (over 400 mm) and small (below 16 mm) motor cores and matching die production technologies for high-demand picture tubes and electronic guns.

3. Design and Manufacture Technology of Large and Precision Plastic Mould

With the rapid development of society and industry, the demand of users for plastic moulds has become higher and higher, and the proportion of plastic moulds has increased year by year, accounting for about 45% of the total number of moulds. As the foundation of modern industry, the mould not only meets the needs of production parts, but also meets the needs of production components, and also meets the requirements of lightweight products, energy saving and environmental protection. Nowadays, automobile, light industry, electromechanical, telecommunication, building materials and other industries, as well as aerospace, new energy, medical and other emerging industries, demand for plastic parts and components is increasing, and the requirements are higher and higher. Therefore, vigorously developing large-scale and precision plastic mould production technology has become one of the important links to improve the level of mould manufacturing in China. Some new plastic forming technologies and the development of corresponding moulds are particularly important, which is of great significance for improving the efficiency of industrial production, energy saving and environmental protection.

According to reports, the main key technologies of this technology include: hot runner technology and its rational application in precision injection moulds; production technology of plastic packaging moulds with multi-injection heads; large plastic moulds matched with injection moulds with more than 1000 tons of clamping force and 200 tons of hot pressing press, and production technology of precision injection moulds with precision of more than 0.01 mm; production technology of multi-color and multi-material moulds; It belongs to the production technology of combined mould with plastic parts; the production technology of laminated moulds for different plastic parts; the production technology of injection moulds with high gloss and traceless without surface processing of plastic parts; the assembly and decoration technology in plastic moulds and the rapid traceless hot pressing technology; the forming technology and moulding technology of new plastics and multi-layer composite materials; the assistant injection moulding technology and moulding technology such as gas-liquid; Co-extrusion and high-speed extrusion die production technology.

4. Design and Manufacture Technology of Large Precision Casting Mould

Casting die is a complete set of casting technology, including die casting die, low pressure casting die, gravity casting die, box-less squeeze casting die and precision casting die. The level of die has a great impact on the level of casting, and the production technology of large-scale precision casting die is also very difficult. At present, due to the low level of casting die, the phenomenon of "fat head and big ear" and low quality of castings is still quite common. There are also many imports of large-scale precision casting die. The improvement of this die production technology will have great significance in improving the quality of castings, developing new castings and improving near net processing level. According to Luo Baihui, the main key technologies included in this technology are: magnesium alloy die-casting die, large-scale die-casting die matched with 2000 tons or more locking force die-casting machine and precision die-casting die production technology with precision of 0.03 mm or more; low-pressure die-casting die with weight of more than 10 kg, precision of 0.05 mm and gravity casting die manufacturing technology with precision of 0.07 mm; and automatic moulding line. Supporting production technology of box-less extrusion casting die, etc.

5. Design and Manufacture Technology of Mould for High Grade Radial Tire

The automobile radial tire has its unique pattern shape. The movable knot die of the high-grade radial tire needs to be designed into a special and complex three-dimensional structure. The requirements of non-roundness, uniformity and geometric accuracy are particularly stringent to ensure the comfort, high speed and safety of the automobile tire, and to reflect the grip performance, heat dissipation performance, turning performance, anti-skid performance and drainage performance of the tire. And so on. It is the most individualized and unique "dynamic" die in the die family. In order to accurately reflect tire pattern design on tire through tire mould, the design and manufacturing process of modern tire mould should apply CAD/CAM/CAE technology to transform the general pattern of tire pattern into the parameters of tire mould, complete the digitalization of tire pattern modeling and structure design, digitalize the manufacturing process, generate NC program, and precisely process by CNC machine tool. Production and manufacturing process is completely transmitted through digital information in the internal LAN, which requires a series of advanced technologies such as digital design, digital transmission, digital processing, digital inspection and management. According to reports, the main key technologies included in this technology are: precision casting and forging technology of aluminium alloy; combination processing of pattern blocks and precise sliding fit control technology; concentricity and precision control technology of die closing; CAD/CAM/CAE technology and CNC precision processing and compound processing technology; high speed parallel processing technology; comprehensive heat treatment and surface treatment technology of die and mould, vacuum treatment technology; Intelligent networked manufacturing technology, etc.

6. Production Technology of Standard Parts for High-grade Dies and Moulds

Standard parts of dies are the basis of dies. Widely using standard parts of dies can not only shorten the production cycle of dies and improve the quality of dies, but also reduce the production cost of dies and facilitate the maintenance of dies. At present, the production of standard parts of moulds in our country lags behind the production of moulds. Some high-grade standard parts of moulds are still blank, so we have to import a large number of them. Only two standard parts of the mould which have the greatest impact on the production of the mould are selected as breakthroughs. This is the hot runner and system with high-pressure nitrogen cylinder and temperature control which can reach (+1 C) for the mould with a life of 1 million times. In addition, oblique tinting mechanism plays an important role in stamping die. Oil-free lubrication push rod is also very important in precision plastic die. It belongs to the standard parts of high-grade die which should be vigorously developed. The breakthroughs in production technology of these products will help to improve the level of large-scale precision dies in China. According to reports, the key technologies include: precise processing technology of piston, piston rod and cylinder block; high reliability sealing and safety technology; hot runner material and precise temperature control technology; precise processing technology of hot runner nozzle; three-dimensional computer simulation analysis technology of plastic flow in the die cavity; design technology of new high-grade oblique tine and research and development and processing technology of oil-free lubrication and wear-resistant materials, etc.