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在制造弯曲和拉伸模时,一般的工作部分转角处制成圆弧半径r过渡。由于热处理时造成模具的变形,所以在热处理前都要留磨削余量,热处理后其硬度达HRC55～65,平面余量由磨床磨削,但对转角处的圆弧(或曲面处的圆弧)要修正到半径r是十分困难的,如图一所示实线为模具实际尺寸,虚线为留有磨削余量a的轮廓尺寸。假设转角半径为r,制订工艺时留磨削余量为a,放余量后的转角半径R究竟取何值较合理呢?经过反复实践得出经验公式如下: R=r+a/1-sinα(当弯曲角为90°
In the manufacture of bending and drawing die, the general working part of the corner made of arc radius r transition. As a result of the deformation of the mold during the heat treatment, the grinding allowance should be left before the heat treatment. After heat treatment, the hardness reaches HRC55 ~ 65 and the plane allowance is grinded by the grinding machine. However, the circular arc at the corner Arc) to be corrected to the radius r is very difficult, as shown in Figure 1, the solid line for the actual size of the mold, the dotted line to leave a grinding margin a contour size. Assuming the corner radius r, the process of setting the grinding allowance for a, put the margin after the corner radius R what is more reasonable? After repeated practice derived empirical formula is as follows: R = r + a / 1- sinα (when the bending angle is 90 °