Special forming technology of stamping
Stamping is known as the oldest forming technology, with long history and the most extensive applications. Stampin is mainly composed of mold, press, adjusting mechanism and power mechanism. With the continuous development of industrial technology, stamping process forming technology is also constantly improving, and new technology and new processes continue to be generated.At present, in order to meet the requirements of different product shapes, stamping parts and stamps, many special forming technologies have been developed, such as deep drawing, multi-stage drawing, tray stamping, special trimming punching, etc., these special forming techniques are the technological progress of stamping process.
The major method of deep drawing is different from ordinary tearing forming and drawing, it issued drawing without separation line, punched deep stem is formed in one pressing, due to the deep stem has shape and strength is remarkable, thus is widely used in the production of automobile and locomotive manufacturing industry and in the production of containers, such as pipes, tanks and canisters and other parts.In order to realize deep drawing processing, we must have rational design of stamping dies, the reasonable design of stamping dies is of great importance for the successful realization of deep drawing.In addition, lubrication conditions, fastening and adjustment of mould, die pre-process debugging operation must also be reasonable, so as to ensure the success of deep drawing.The deep drawing process includes several stages, such as milling and shaping, pre-stretching, main stretching, and finally, the die opening process.
Tray stamping, also known as broaching, is a process of continuously forming thin parts. It is mainly used for low carbon cold rolled sheets, galvanized sheets and aluminum alloy sheets with a thickness of less than 0.8mm.It is mainly composed of broach, two ends of die, part body and compression mechanism. The inner wall of the die has a special shape of one side oblique teeth.Broaching is mainly used in the production of various thin plate parts, such as auto gauge, flow channel, antenna ring, dust cover, etc. in mobile phones, TVs and other communication electrical equipment.
Special trimming punching is a special process used for punching thin-walled suction plate or blister plate, which is commonly used for stamping thin-wall parts. It is different from ordinary punching in that the part thickness is limited, complexity of shape is greater, and the punching surface is required to be smooth and consistent with the periphery.When used for chip punching, the lower die should have a stepped structure and designing a tilt to the mold, according to the direction of the stripped chips.The size of the blank which must be punched should be calculated in advance and properly adjusted by the adjustment mechanism of the press.
In addition to the above special forming techniques, there are many other special forming techniques, such as roll forming, hot forming and combined stamping.These special forming processes are used to meet the needs of some specific parts, forming technology, and the corresponding stamping dies, providing an effective technical method for the manufacture of modern products.
