Root restriction die manufacturing technology is the processing of mould of high-end multi axis CNC machine tools. China mold industry output value of more than 1.8 yuan, grew at an average rate of 17%, higher than the average value China GDP more than doubled. Automobile industry as one of the lower reaches of the main application of mold industry, Chinese about 1/3 mold products for the automotive industry service, Chinese mould association secretary general Wu on the art of war said car body equipment committee.
Mould is the basis for the process equipment of automobile industry, the automobile production in more than 90% of the parts depends on the die forming. The making of an ordinary car 1500 sets of mould, which accounted for more than 1000 sets of stamping die. In the development of new car model, 90% of the workload is carried out around the body surface change. In the new vehicle type development costs, about 60% for the development of the body and the stamping process and equipment. In the vehicle manufacturing cost is about 40% of car body stamping and assembly cost.
The future of die serving the automotive industry the proportion will continue to rise. Calculation of market share accounted for by automotive die mold industry about 1/3, the 2014 car mold market scale reached 600000000000 yuan.
The key of mould enterprises in China reached nearly 110, which accounted for about 37%, stamping die, these data strongly proved that China has become the automobile mould manufacturing country fact, international model assist secretary-general Luo Baihui said.
Automobile production in more than 90% of the parts need to rely on forming die, in developed countries, such as Japan America automobile manufacturing, mold industry for more than 40% of the products are automobile mould, while in China only 1/3 of the mold products is in the service of automobile manufacturing industry.
According to the forecast of China Automobile Industry Association statistics, in 2015 China's automobile production capacity reached 34000000 vehicles, such a huge market demand will bring infinite business opportunities for China automobile die industry. China's mold industry to intensive way and take intensive development path, be sure to the "low input, high output" business goals, the need to mold enterprises from many aspects to change.
The development of the domestic automobile die industry is very rapid, automobile manufacturing enterprises of the mold also has a considerable scale and quantity. Analysis of the industry, mold production is still in the low end of repeated construction, there is a great gap in high-end mold products. But along with the domestic automobile industry continue to high-end development, to mold the needed requirements are increasingly high, but at present in our country the development of high-end mold design and manufacturing capability, far can not fully meet the needs of China's automobile industry, high-end die still need to import large quantities of.
So to solve the high-end die rely on imports of this problem, we must first improve the manufacturing level of our country mould. To improve the manufacturing level of our country and the mold must be started from the mold development and manufacturing high-end.
Experts said, the root control mold manufacturing technology, is the processing mould of high-end multi axis CNC machine tools. To constantly strive, strive for developed has the functions of high speed, complex, intelligent, environmental protection and other high-end multi axis CNC machine tools, in order to promote the domestic automobile die industry towards high-end.
Three dimensional design
Die design is an important content of digital mould technology, is the basis for realization of the mold design, manufacturing and inspection of integration.
Japan Toyota, USA GM has realized the 3D design of mould, and has achieved good application effect. In addition to mold 3D design is conducive to the realization of integrated manufacturing, advantage is convenient for interference checking, can be used for analysis of motion interference, to solve a problem in two-dimensional design.
In recent years, with the rapid development of computer software and hardware, stamping forming process simulation technology plays a more and more important role. In the developed countries such as the United States, Japan, Germany, CAE technology has become a necessary part of the process of mold design and manufacturing, are widely used to predict forming defects, the optimization of stamping process and die structure, improves the reliability of the die design, reduce the time of die trial. Many domestic automobile mould enterprises have also made significant progress in the application of the CAE, a good effect is obtained. Application of CAE technology can greatly reduce the cost of test, shorten the stamping die development cycle, has become an important means to ensure the quality of die. The CAE technology is gradually changing from the mold design experience in the design for the scientific design.
In recent years digital mould technology of rapid development, is the effective way to solve many problems faced in the development of automobile die. The so-called digital mould technology, is the computer technology or computer aided technology in the process of mold design and manufacturing applications.
Processing technology and equipment of advanced is to raise productivity and the important basis to ensure the product quality. In advanced automotive die enterprise with double working table of NC machine tools, automatic tool changing device, automatic processing of photoelectric control system, the workpiece online measuring system is not uncommon. NC machining has changed from pure surface processing to the development of surface and structure the comprehensive processing, by the low-speed processing the development of high-speed processing, development of processing automation technology very quickly. High strength steel plate stamping technology is the future development direction. Due to the excellent properties of high strength steel with the yield ratio, strain hardening characteristics, the strain distribution and collision energy absorption ability etc., usage in the car on the increase.
At present, high strength steel used in automobile stamping on the main bake hardening steel, dual phase steel, transformation induced plasticity steel etc.. International super light body term is expected to launch in 2010 the advanced concept models in the 97% materials for high strength steel, the proportion of advanced high strength steel in the vehicle materials will be more than 60%, of which the dual phase steel ratio will be accounted for 74% of vehicle plate.
Now a lot of the use of IF steel mainly mild steel series will be high strength steel plate series substitution, high strength low alloy steel will be dual phase steel and ultra high strength steel plate instead of. At present, the application of the domestic automobile parts of high strength steel is limited to structures with beam parts, the material tensile strength below 500MPa in. Therefore, quickly grasp the high strength steel plate stamping technology, is an important problem of China automobile die industry to be solved.
The timely launch of new die
With the development of automotive stamping production efficiency and automatization, progressive die used in automotive stamping parts production will be more widely. Stamping parts with complicated shape, especially by traditional process need more die blanking punching small sequence of complex stamping parts, more and more use of progressive die forming. The progressive die is a kind of high-tech mold products, technical difficulties, high precision manufacturing, the production cycle is long. Multi position progressive die will be one of China's focus on the development of the mold products.
The quality and performance of die materials is an important factor affecting the mold quality, cost and life. In recent years, in addition to constantly have a variety of high toughness and high wear resistance of cold working die steel, flame quenching cold working die steel, powder metallurgy cold work die steel introduced, foreign cast iron materials in large and medium-sized stamping die, is a noteworthy development trend. Nodular cast iron with high toughness and good wear resistance, welding performance and machinability and surface hardened properties are good, and the cost ratio of alloy cast iron is low, so the more application in automobile die.
Mould manufacturing precision, is development process and in manufacturing results of mold, the concrete expression for stamping process and die structure design rationalization, mold machining high precision mold products, high reliability and technical management of the tight. Manufacturing precision mould is actually not a single technology, comprehensive reflection but design, processing and management technology. Mould manufacturing precision realization in addition to excellence by technology, but also by the strict management to ensure.
