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导正销是冲模的定位装置之一,其作用是使送入冲模的毛坯有正确的位置,以保证冲出合格的工件。在冲裁过程中,当凸模尚未进入凹模之前将导正销先插进已冲好的孔中,随着凸模的下降,通过斜面部分带动工件,使工件通过斜面上部的圆柱部分,以保证工件内孔与外形的相对位置精度。消除由于送料而引起的误差。现仅就导正销斜面部分的设计原则作一探讨。导正销带动工件的作用是靠其下部的斜面来完成的,因此,斜面的结构必须合理。如果用“α”来表示斜面与垂直面的夹角,它的大小与斜面圆弧半径 R 以及斜面高 H(见图1)的关系是:
Pilot Punches is one of the punches’ positioning devices. Its function is to make the blanks fed into the die have the correct position so as to ensure the punched out of the qualified workpieces. In the blanking process, when the punch has not yet entered the die before the guide pin into the hole has been punched well, with the punch down, through the bevel part of the workpiece, the workpiece through the upper part of the cylindrical part of the ramp, To ensure the relative position of the hole and the shape of the workpiece accuracy. Eliminate the error caused by feeding. The guideline is only on the design principles of bevel part for a discussion. Pilot is driven by the role of the workpiece is by its lower bevel to complete, therefore, the bevel structure must be reasonable. If “α” is used to indicate the angle between the bevel and the vertical plane, its size is related to the radius R of the bevel and the height H of the bevel (see Figure 1)