Development of advanced forming technology for new stamping process
The development of stamping technology is closely related to materials and structures. It is expected that in the next 10-15 years, environmental requirements and increasingly stringent environmental laws will lead to major changes in automotive materials and structures. In order to reduce urban CO2 emissions, the car strives to be lightweight, and its most prominent development direction is to improve the specific strength and specific stiffness of the materials used and to develop efficient and lightweight structures. In the modern body structure, high-strength steel accounts for about 25%. At the same time, we continue to develop ultra-high-strength steel, combined with the development of new "efficient structure" and manufacturing technology, and strive to reduce the weight of the car by more than 20%. However, the more interesting direction is to expand the application of low-density alloy materials such as aluminum and magnesium in automobiles.
Europe and the United States are researching and developing a future-type aluminum body car that can reduce weight by 40-50% and consume only one-third of the current car average. The main problems at present are the development of low-cost aluminum alloys, the development of new structures and efficient manufacturing methods, and the improvement of recycling technologies. Once the cost problem is solved, aluminum alloys may become the main structural material for automobiles.
Since 1991, magnesium production has doubled every five years and is a promising future material. It is expected that the application of magnesium will increase significantly after 2003, including large exterior parts.
Composite board materials also have broad application prospects in automobiles, airplanes, medicine, food, chemicals, and daily necessities.
In addition, bake hardened boards, surface modified boards and other modified materials. In the 1980s, Europe and the United States studied the stamping technology of galvanized sheet; in the 1990s, the focus was on the rush of laser tailor welded blanks.
Pressing and precision forming technology for various extruded tube blanks. The amount of aluminum profiled parts is also increasing.
Structural holism is an important development trend, not only for aircraft, but also for future vehicles.
With the expansion of new materials and new structures, there is an urgent need to develop corresponding low-cost stamping forming technologies. Current research focus:
Stamping technology for body parts such as aluminum alloy covers. There are practical process and mold design data in foreign countries.
(1) Internal high pressure forming technology for extruding a tube blank.
(2) Stamping technology for laser-welded slabs of various thicknesses.
(3) Forming technology of composite sheets, etc.
For the aircraft industry, the forming technology of titanium alloy, aluminum-lithium alloy complex shape parts and aluminum alloy special structural parts is the current research focus.
Various hydroforming techniques, which use liquid directly or indirectly as a half-mold or sensing medium, are semi-molded or soft-formed and have many advantages (already nearly 60 years old), which are the main manufacturing methods for aircraft Sheet metal parts. In the past decade or more, after the high-voltage source and high-pressure sealing problems have been solved, it has been rapidly developed and has gained important applications in the automotive industry. Hydroforming includes hydraulic rubber bladder forming, liquid-filled deep drawing, and internal high pressure tube forming. Hydraulic rubber forming has expanded from the traditional application of the aerospace industry to the formation of complex internal and external panels of automobiles. Under 100-140 MPa pressure, the forming quality is very good, suitable for trial production and small batch production. The emerging internal high-pressure forming technology has been put into practical use and industrialization, and the production of engine brackets, exhaust pipes, camshafts and frame parts has achieved good efficiency and efficiency. It is expected that hydroforming, tailor-welded blank forming and laser welding assembly will It is the three key technologies for lightweight vehicles in the future.
In addition, research on pressure medium pressure forming, magnetic pulse forming, and various moldless forming techniques has also made great progress, showing more and more process flexibility.
Deshengrui Machinery is a professional CNC manufacturing and Sheet metal fabrication company, including CNC machining services, CNC turning service, CNC milling services, CNC drilling services, laser cutting services, stamping services, Die casting service, iron casting service and Steel Forging service.