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§3.7 平面度一相对间隙试验 今以挠度f与板材厚度t的比值表示冲裁件的平面度。由于凸模与凹模之间的间隙大于零,因而在冲裁过程中必然产生弯曲力矩,使板料引起塑性弯曲。曾经对十种常用
§ 3.7 flatness of a relative gap test to the deflection f and the thickness of the sheet t said the flatness of the blanking piece. Due to the gap between the punch and the die is greater than zero, so in the blanking process will inevitably produce bending moments, so that sheet metal caused by plastic bending. Used to ten commonly used