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第二章拉伸及成形形状缺陷§2.14 压花的周围破裂在大型零件的中央或某一局部上进行压花成形是非常多的,压花的纵壁裂纹及压花周边的畸变等缺陷容易发生。裂纹几乎是从纵壁的凸模圆角终止部分或凹模圆角终止部分沿周向发生。另外,为了抑制裂纹,采用无压料板或降低压边力的方法成形时,在压花的周围又要产生畸变成皱折(见图2—41)。
Chapter 2 Stretching and Forming Shape Defect §2.14 Embossing Peripheral Cracking There are a lot of embossing in the center of a large part or in a certain part. The defects such as embossing longitudinal wall cracks and embossing perimeter distortion are easy occur. Cracks occur almost circumferentially from the end of the punch fillet or the end of the die fillet in the longitudinal wall. In addition, in order to suppress cracks, the use of non-pressure plate material or reduce the blank holder force when forming, in the embossing around and then have to produce distortion (see Figure 2-41).