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我厂需要大最加工如图1的零件,材料为日本牌号430钛不锈钢,硬度为HB80～90,外形冷镦成形。在仪表车床上用夹头夹持已成形的外径,采用成形车刀车削内孔。该工件质软壁薄,但夹持部分不允许有轻微的夹持痕迹及划伤。在加工结束夹持放松后,工件要在离心力作用下脱离夹头。在图1中,工件壁厚尺寸为0.8±0.05mm,即工艺要求为0.8±0.02mm。对这样的工件,选用常用的弹簧夹头作为夹紧元件是达不到上述要求的。我们参考了有关资料,经过数次试验,制成了高精度弹胀夹头,如图2。所谓弹胀夹头,就是夹头在自由状态时的内径大于工件外径0.3～0.4mm。夹紧后两者再趋于一致。
I plant the largest part of the process shown in Figure 1, the material for the Japanese brand 430 titanium stainless steel, hardness HB80 ~ 90, shape cold heading forming. In the instrument lathe chuck with a shaped outer diameter, the use of forming turning the hole. The workpiece soft thin wall, but the clamping part does not allow slight clamping marks and scratches. After the process of clamping to relax, the workpiece to be centrifugal force under the chuck. In Figure 1, the workpiece wall thickness of 0.8 ± 0.05mm, that is, the process requirements of 0.8 ± 0.02mm. For such workpieces, the use of commonly used collet chuck as a clamping element is less than the above requirements. We refer to the relevant information, after several tests, made of high-precision bulging chuck, shown in Figure 2. The so-called bulging chuck, chuck is the free state diameter greater than the workpiece diameter 0.3 ~ 0.4mm. After the two tend to be the same after clamping.