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加工套筒类内外圆有同轴度要求的内孔时,由于普通三爪卡盘的安装误差较大,不易保证工件的精度,如采用图1所示具有圆柱形可换垫块的装配式卡爪,既可保证加工的质量,又可提高生产率。图1a中卡爪的尺寸适用于φ250mm的卡盘上。这种卡爪是由经淬火的带弧齿条的卡爪座1和不经淬火的垫块(软垫)2组成,二者甩螺钉4相连。垫块可用10、20或A3钢制造,并在其夹紧工件直径处的一侧面上切出圆弧形台阶3。如需夹紧其它直径尺寸的工件时,可将垫块在卡爪座内回转180°安置并在另一侧上作出相应尺寸的台阶或者更换新的垫块。为保证各卡爪间有较高的同轴度,垫块上的圆弧形台阶须将各卡爪安装到机
Sleeve class inner and outer cylinder with coaxial requirements within the hole, the common three-jaw chuck installation error is not easy to ensure the accuracy of the workpiece, as shown in Figure 1 with cylindrical removable pad assembly type Claw, both to ensure the quality of processing, but also improve productivity. The size of the jaws in Figure 1a is suitable for a chuck of φ250mm. This kind of claw is made up of a quenched claw seat 1 with a serrated rack and a non-quenched block (cushion) 2, both of which are connected by the screw 4. The blocks may be made of 10, 20 or A3 steel and the circular arc-shaped step 3 is cut out on one side of the diameter of the clamped workpiece. To clamp workpieces of other diameter dimensions, place the paddle 180 ° inside the jaw base and place a step of the appropriate size on the other side or replace with a new one. In order to ensure a high degree of concentricity between the jaws, the circular arc-shaped steps on the spacer must be installed on the machine