Steel Set Screw Type Conduit Connector Why does automob […]
Why does automobile metal stamping parts cause tearing? The quality of finished products in stamping factories will lay a reliable foundation for the appearance and performance of the entire vehicle. Therefore, the quality assurance of stamping parts has always been an issue that automobile manufacturers attach great importance to. In this article, science and technology experience shares the causes of tearing caused by automotive metal stamping parts:
Common tearing and skewing forms of metal stamping parts. The stamping process of the middle protective surface bracket is: blanking and punching-punching cut-flanging forming-cut-flanging. There are many forms of tearing and skew during the forming process of the middle protective surface bracket. The tearing parts are mainly distributed at the hole pattern of the workpiece, and the R arc at the corner of the side wall and the junction of the wall neck, etc., due to stamping and production The difference in process conditions, the proportion of each fractured part is different. The tear can be a one-time forming tear or a tear caused by the development of fatigue cracks, that is, invisible cracks.
Analysis of the cause, according to the actual situation on the site, by inspecting the tearing position, fracture shape and degree of crushing of the part, it is believed that the tearing and skewing behavior of the part is mainly reflected in the flanging forming process. The reasons for this process are as follows:
The forming process parameters are not in place. During the forming of the parts, the process requires that the die, the blanking core and the two parts must be closely attached to each other. When the machine tool slides slide down, the sheet material is plastically deformed to achieve forming. However, due to the shortcomings of the pressed parts such as unstable quality, it shows that the pressure of the machine tool is in a state of unbalanced pressure fluctuation during the production process. The main reason is that the processing technicians did not adjust the pressure of the machine tool in time at this stage in accordance with the requirements of the process designation, or did not communicate the machine pressure stability information with each other during the handover of each shift, resulting in poor quality of the parts. stable.
The design defect of the flanging forming mold. The mold is shared by the left and right parts of a two-cavity mold. In addition to the flanging, the content of this process also has the shape forming content. In addition, the parts are particularly complex and the curved surface is narrow. The matching of the core and the forming surface results in a large forming stroke of the mold structure and a small pressing area. In the initial mold design, the designer only considered the feature of small blanking surface, but ignored the guiding slide stroke of blanking core.
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