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在车制以内孔定位夹紧的工件时,一般采用弹性心轴,它的特点是定心好、夹紧力大,但缺点是夹紧速度慢、效率低,制作比较麻烦。针对这些情况,笔者根据超越离合器的原理,设计了一种新型的夹紧装置——超越式心轴,能加快换件速度,减少辅助时间,心轴的制作也较方便。超越式心轴的结构见附图,它由心轴1、滚柱3及弹性圈2组成。心轴的外径由工件内径确定(与工件间隙配合),心轴上有三条互为120°的楔形槽,槽的最深处为4mm,以嵌入φ4mm的滚柱,心轴的中间有条深1mm的凹槽,用来嵌弹性圈以约束滚柱,弹性圈用φ1mm的弹簧钢制成,外径与心轴外径相同或略小于心轴外径。滚柱直径φ4mm,凹槽处直径φ2mm。装工件时,将工件一方面轴向装入,另一方面又使工件与
In the car within the hole to locate the workpiece clamping, the general use of flexible mandrel, which is characterized by good centering, clamping force, but the disadvantage is the slow clamping speed, low efficiency, making more trouble. In view of these situations, the author has designed a kind of new-style clamping device - transcendental mandrel according to the principle that surmounts the clutch, can quicken the changeover speed, reduce the auxiliary time, the manufacture of the mandrel is also more convenient. The structure of the transcendental mandrel is shown in the attached drawing, which consists of the mandrel 1, the roller 3 and the elastic ring 2. The outer diameter of the mandrel is determined by the inner diameter of the work piece (with the clearance of the work piece). There are three wedge-shaped grooves on the mandrel with 120 ° of each other. The deepest part of the groove is 4 mm, so as to embed a φ4 mm roller. 1mm groove for embedded elastic ring to restrict the roller, the elastic ring with φ1mm spring steel, the outer diameter and the outer diameter of the same or slightly smaller than the outer diameter of the mandrel. Roller diameter φ4mm, groove diameter φ2mm. When loading the workpiece, the workpiece is loaded axially on the one hand and the workpiece on the other hand