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精冲时材料剪切区的温升与冲裁功和冲裁速度的关系极大。工件冲裁时所消耗的冲裁功在冲裁过程中转换为热,这些热大部分出现在剪切区,并导致晶体变形。图1表示冲裁件在正常冲裁间隙(曲线a)和精冲(曲线b)时的冲裁力—行程—曲线图。横座标和曲线a之间的面积为“粗冲裁功”,横座标和曲线b之间的面积为“精冲裁功”。在精冲时所消耗的功以及由此而产生的热量比在正常冲裁间隙冲裁时约大一
Fine blanking material shear zone temperature and blanking power and punching speed of great relationship. Blanking work is blanked when the blanking process is converted into heat in the blanking process, most of these heat in the shear zone, and lead to crystal deformation. Fig. 1 shows the blanking force-stroke-curve of the blanking member at normal blanking intervals (curve a) and fine blanking (curve b). The area between the abscissa and the curve a is “Rough Punching Work,” and the area between the abscissa and the curve b is “Fine Blanking.” The work done during fine blanking and the resulting heat is about greater than at normal blanking interval blanking