Design ideas for vertical trimming of the bevel of the stamping and trimming die:
The bevel angle θ and depth H determine the quality and feasibility of vertical trimming of the stamping and trimming die. If the bevel angle θ is too small and the bevel angle depth H is too large, the parts will have defects such as burrs and strips. In the actual production process, There will be many problems in the vertical repair of the bevel of stamping parts. In principle, the wedge-shaped trimming part can be used in the trimming process design, and vertical trimming is not recommended. 2.4 Design of the gap between the trimming and punching tool seats The quality of the stamping parts, the cutting force and the life of the cutting die have a great influence. Very important process parameters. The main factors affecting the gap value are the material properties and the thickness of the workpiece. The larger the design of the gap between the edge and the punching hole. The design of the gap value of the trimming and punching of the automobile stamping parts refers to the standards given in Figure 5 and Table 4 below. In the actual production process, the working parts of the trimming die are worn, consumed, There are often gaps between the knife blocks, causing parts burrs, peeling and other problems. In the process of repair and maintenance, the knife seat gap is one of the basic skills of mold assemblers. If the gap is too large or too small, it is easy to produce burrs. Gap When it is large, the burr is thick and large, and it is not easy to remove; when the gap is small, the burr is characterized by high and thin. The clearance value of the knife seat shall prevail for the production parts that meet the quality requirements. 2.5 Optimization of the trimming line and design of the scrap knife for trimming The contour of the trimming line in the process depends largely on the boundary contour of the workpiece. When designing the trimming line, factors such as process clearance, edge strength and waste discharge should be fully considered. For parts with two trimming lines, trimming should be considered. The overlapping process of the edge line. The overlapping process of the two trimming lines is shown in Figure 6. Once, the two trimming lines overlap 1.0mm, and the cutting edge overlaps 25mm. The design of the edge trimming should avoid defects such as edge trimming or insufficient strength of the pressure plate. Automobile stamping parts When the left and right parts are clamped for production, the structural strength of the mold should be ensured at the separation of the left and right parts, and the distance of the trimming line at the separation should not be less than 6mm. It will increase with the increase of the thickness of the workpiece. When meeting the strength, consider the material utilization rate, separation The distance of the edge trimming line should not be too large. The content design of the edge trimming process of the stamping and trimming die should focus on the slipping out of the scrap, and the layout of the scrap knife is very important. The layout of the scrap cutting machine should meet the following requirements:

(1) The size of garbage should not be too large, the size of strip garbage should not exceed 650mm, and the size of L-shaped garbage should not exceed 500mm.
(2) The scrap cutter is preferably set at the corner of the trimming line, as close as possible to the root of the fillet. In order to facilitate the discharge of the scrap, the scrap cutter should be offset by 5 degrees and 10 degrees in the same direction.
(3) When the chips slide out, the rotation direction of the chips on the same trimming die should be the same. In principle, the broken knives of adjacent scraps are not allowed to be opposite. In unavoidable cases, the forced injection of scraps should be installed on the mold structure device.
(4) The edge surface of the scrap knife near the trimming incision of the workpiece should face the incision, and the edge surface of the scrap knife should avoid facing the trimming line as much as possible.