Innovation of stamping process for chassis stamping parts and solutions to defec

1、 Innovation approach for stamping process of automotive chassis: 1. Optimizing the combination of processes. Based on the completion of a stamping part, there are often multiple processes in the process, so multiple processes are combined or a single process is combined as much as possible. When the stamping part size is too small, composite molds or continuous molds are selected for production. 2. Design Measures for Manufacturing Molds for Automotive Stamping Parts (1) Determination of Mold Structure Form and Type Stamping Parts; After the establishment of the process plan, the single die, compound die and continuous die can be selected by simple operation, which is mainly reflected in the unity of stamping for different dies in multiple processes. The positioning surface should be based on no deformation or movement, and flange positioning should be selected for different shapes of parts. (2) As a key link in car body manufacturing, the manufacturing process quality of automotive stamping parts is directly related to the actual profits of enterprises through modular body technology. Therefore, improving the body design and process design to achieve efficiency and cost reduction is the current core development trend. The modular technology of the vehicle body has improved the adaptability of the production line, and the application of platform based and modular methods has been enhanced. The stamping process design in stamping dies is a typical innovative design process. Especially the introduction of KBE technology will be a way for innovative design of stamping dies. In the stage of workpiece design, it is necessary to analyze the processing characteristics of the workpiece, formulate the mold type, basic process parameters, and continuously develop the process plan. In the stage of using stamping dies, the first step is to carry out product stamping activities, and then take corresponding measures to solve problems that arise during different periods of use. In the stamping stage, apply the methods and systems of innovative design to the stamping process design. Especially in the digitalization and intelligent design of stamping dies, a combination of manual and computer methods is first used to manually complete processes such as product drawing development, process design and strip layout, and concave die layout. Secondly, according to the stamping requirements of the parts, the stroke of the slider, the speed curve of the slider, the holding time of the bottom dead center, the nominal pressure, etc. can be programmed arbitrarily, making the mold processing technology have the characteristics of high service life. 2、 Solution to stamping defects 1. Wrinkle solution If the wrinkling problem occurs around the component, it can be solved by adjusting the edge pressure. In production, the air cushion pressure will be increased and the height of the balance block will be reduced, and the material pressure will cause wrinkles. If it is a stretched conical or hemispherical part, the material is in a suspended state at the beginning of stretching, which makes it easy for the side walls to wrinkle. Therefore, in addition to increasing the pressure, it is also necessary to increase the number of stretching ribs and change the shape of the ribs to increase the radial tensile force inside the plate, resulting in wrinkles. Alternatively, the gap between the pressing surfaces can be adjusted to distinguish between the bending deformation of straight lines and the elongation deformation zone, and to increase the gap between the pressing surfaces so that they can maintain their pressing function during material movement, thereby avoiding wrinkling problems. 2. If there is a problem of tearing, it is necessary to adjust the height of the pressure ring balance block of the stretching mold to adapt to the deviation of equipment accuracy and the gap between the concave and convex molds, in order to achieve force balance. Secondly, if the fillet radius of the concave die is too small, it is easy to cause tearing problems. Therefore, it is necessary to increase the fillet radius of the concave die to improve the degree of tearing. It is also possible to change the shape of the stamping material before deep drawing, taking advantage of the cutting edge of the process and reducing the problem of tearing caused by material accumulation. Alternatively, the position and shape of the stretching ribs can be changed, and semi-circular or trapezoidal ribs can be used according to the thinning rate of the material. 3. The main solution to the rebound problem currently is to supplement the forming process with the pressing surface, which can reduce the need for drawing. This method is mainly used when the pressing surface is on the flange surface of the component. Usually, the bending of the pressing surface occurs. In order to reduce the need for drawing while still allowing the blank to adhere tightly to the pressing surface, it is necessary to machine the local pressing surface at a tilt angle of about 60 degrees. If the angle is too small, it can cause wrinkles, but if the angle is too large, it can also cause serious rebound. At the same time, it is necessary to avoid the occurrence of ripples during the stretching process, mainly due to the effect of the punch on the drawn blank. By controlling the stretching distance, you can avoid rebound and ensure the quality of the components. 4. Strengthen the use of simulation technology for stamping parts; During the forming process, the simulation software for sheet metal processing requires operators to have sufficient technical ability and experience accumulation. Currently, due to the significant differences in experience and technology among different personnel, there may be significant discrepancies in the simulation results of different personnel. In order to use simulation technology effectively, enterprises need to increase investment, improve computer hardware and software levels, and strengthen talent introduction. Enterprises can further fully utilize optimized simulation software. At the same time, enterprises also need to strengthen talent cultivation, enhance workers' computer skills, and meet the operational needs of stamping simulation.