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我厂生产的东风-12型手扶拖拉机上的零件——离合器皮带盘上有三条互成120°的定位键槽,如图A所示。这三条键槽本可放在插床上加工,但由于我厂无插床和必要的分度装置,我们便采用了一种新的加工工艺。首先,将皮带盘装夹在牛头刨床的工作台定位夹具上,三爪卡盘装在牛头上,三把成形刀片按要求分别镶在卡盘的三个爪子上,与卡盘保持同心,同时,卡盘与定位夹具的止口保持同心,按尺寸要求控制好牛头的行程,然后
I produced the factory Dongfeng -12-type tractor parts - clutch belt pulley with three 120 ° positioning keyway each, as shown in Figure A. The three keyway can be placed on the slot machine processing, but because I plant no slotting machine and the necessary indexing device, we have adopted a new processing technology. First of all, the belt reel is clamped on the worktable positioning fixture of the shaper. The three-jaw chuck is mounted on the head of the bull. The three forming blades are respectively mounted on the three claws of the chuck according to the requirement and are concentric with the chuck , Chuck and positioning fixture to keep concentric, according to the size control of the head of the trip, and then