The manufacture of Automobile Press Parts is a forming proces method that applies external force to plates, strips, pipe and profiles by means of a press and a die to produce plastic deformation or separation so as to obtain workpieces (stamping parts) with required shapes and sizes:
1, the design of stamping parts must be conducive to improving the utilization rate of metal materials, reduce the varieties and specifications of materials, as far as possible to reduce the consumption of materials. If allowed, use low-priced materials to make parts as waste-free and waste-less as possible.
2. Stamping parts designed shall be favorable for processing with existing equipment, process equipment and process flow as much as possible, and shall be favorable for prolonging the service life of stamping dies.
3,
the design of stamping parts must be simple in shape and reasonable in
structure, in order to simplify the structure of the mold, simplify the number
of working procedures, that is, to use a few and simple stamping procedures to
complete the processing of the whole part, to reduce the re-use of other methods
of processing, and to facilitate the stamping operation, to facilitate the
organization and realization of mechanized and automated production, in order to
improve labor productivity.
4.
Under the condition of ensuring normal use, the designed Chinese mechanical
parts shall have lower requirements for dimensional accuracy grade and surface
roughness grade as far as possible, which is conducive to the exchange of
products, reduce waste products and ensure stable product quality.
In the welding and manufacturing die of stamping parts, the shape of stamping parts is formed by punching the residual materials around the Chinese mechanical parts. The main reason for turning and twisting of punching parts is the influence of punching force. During blanking, due to the existence of blanking clearance, the material is stretched on one side of the female die (the material warps upward) and compressed on the side of the male die.
When the discharging plate is used, the discharging plate is used to compress the material to prevent the material on the concave die side from warping upwards. At this time, the stress condition of the material changes correspondingly. With the increase of the pressing force of the discharge plate, the material on the male die side is stretched (the compression force tends to decrease), while the material on the female die surface is compressed (the stretching force tends to decrease).
The turnover of China Mechanical Parts is caused by the material on the concave die surface being stretched. Therefore, during blanking, pressing and pressing the material is the key point to prevent the punching piece from turning over and twisting.