Hardware stamping parts common tear, skew the middle of the face of the stent stamping process: blanking punching - punching incision - flanging forming - cut - flanging. In the process of forming the middle face of the brackets, there are many types of tearing and skewing. The tearing parts are mainly distributed in the hole of the parts, and the corner of the side wall is at the junction of the R arc and the wall. Differences in process conditions, the proportion of each broken parts of the different. The tear may be a one-time forming tear, or it may be due to fatigue cracking, i.e., tearing caused by the development of the invisible crack.
According to the actual situation of the scene, by tearing the parts of the parts, fracture shape and the degree of crushing, that is caused by tearing parts, skewing behavior is mainly reflected in the flanging forming process, causing the phenomenon of the phenomenon occurred as follows:
1. Forming process parameters are not in place, in the process of forming parts, the process requires the die, the pressure of the core and the two parts must be closely fit together in the machine when the slide slide pressure deformation of the plate to achieve Forming. But now because of the deformation of the workpiece there is the quality of instability and other shortcomings, it shows that the machine pressure in the production process in the pressure beating uneven state. The reason is that the processing technician does not adjust the machine pressure in time according to the process designation requirements, or does not communicate with the machine pressure stability information at the time of each handover, and the quality of the workpiece is not stable.
2. Flanging forming mold design defects, the mold for a mold double cavity left / right pieces of public, due to the contents of the process in addition to flanging, but also both shape forming content, combined with special parts of the complex, curved surface is small, Molded material core and the forming surface consistent with the mold structure conditions lead to forming a large stroke, the material area is small. Designers in the initial mold design, only taking into account the characteristics of the small surface of the binder, but ignored the pressure of the core forming guide slip.

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