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The thickness of the mold material has many effects on the stamping process

by:Fortuna     2021-03-06
In the cold stamping process, the thickness of the sheet material has a great influence on the stamping process, which mainly includes the following aspects: 1. The influence of the material thickness on the stamping process The material thickness has a direct impact on the arrangement of the cold stamping production process. For example, for thick sheet metal blanking, because the material is thicker, under the influence of the large gap, the accuracy is low and the quality is rough, and it needs to go through the refurbishment process to meet the accuracy requirements. When drawing thick sheet metal parts, in order to make the drawing process go smoothly, an intermediate annealing process is required. Therefore, in the production of stamping parts, it is necessary to consider whether the stamping production process used is reasonable according to the material. 2. The influence of material thickness on stamping process parameters Stamping deformation force, unloading force, die gap, etc. are all proportional to the material thickness. Therefore, the material thickness must be considered in the cold stamping process arrangement and mold design. When punching thin materials, the mold gap is small, so the mold manufacturing quality and the precision of the press are higher. Since the gap value and the gap range are small, the manufacturing accuracy of the convex and concave molds must have higher requirements. In order to ensure the above reasonable clearance in blanking, the manufacturing and assembly of mold parts must be strictly controlled. When punching thin sheets, not only the guiding structure should be considered on the mold, but also the high-precision rolling guide post and guide sleeve guide structure should be used. If necessary, a compound guide structure should be used. 3. The influence of material thickness on the stamping deformation force. The material thickness has a proportional relationship with stamping deformation. The thicker the material, the greater the punching deformation force. The correct stamping equipment and strength mold should be selected according to the size of the deformation force. For thin sheet metal stamping, the process resistance should also be less than the nominal pressure of the press to be safe. The discharge force of stamping parts is also proportional to the thickness of the material. Mold design must consider the use of rigid unloading device, but also to make the unloader have enough rigidity and strength. 4. The influence of material thickness on the dimensional accuracy of stamping parts The dimensional accuracy of stamping parts will be affected by springback and impact The influence of the cutting surface. But no matter in the bending, deep drawing and punching processes, the springback of stamping parts is larger than that of thick materials. Although the precision of thin material president parts is lower because of the larger springback. Therefore, the general trend is that the dimensional accuracy decreases with the increase of the material thickness. 5. The influence of material thickness on mold structure The thickness of stamping material is an important factor that directly affects the mold gap. The thinner the material, the smaller the gap required; conversely, the thicker the material, the larger the gap required. Reasonable die blanking clearance is the main factor that causes the upper and lower cracks to overlap when the blanking process is in the fracture separation stage, which determines that the reasonable blanking clearance must have a certain proportional relationship with the material thickness. Recommended article: Do you know the difference between thin plate and thick plate in stamping parts processing? Previous post: Concept and technical requirements of machining
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