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我矿是露天煤矿,目前在煤炭采掘生产中采用美国加登纳一丹佛公司生产的GD-25C型爆破孔钻机。该钻机所用的钻杆是无缝钢管和两端接头焊接而成的组合体。每根钻杆长7.6m,此钻杆接头是个易损坏的零件,并且加工比较困难。因此,为了解决钻杆螺纹的加工问题,我们专门设计了一种采用C630型车床车削的夹具。 1 夹具结构 夹具如图1所示。该夹具利用夹具体2上1:10的锥度,与夹爪部分相配合,实现对工件的精确定位。在C630型车床上用三爪卡盘装夹夹具体前端圆柱体部分,圆柱体表面上铣了夹角为120°的三个铣平面,与三爪卡盘的三爪相配合,铣面的作用是车削工件时防滑、增大扭矩。夹紧螺栓1从车床主轴箱前端孔内用专用工具调整。拧紧夹紧螺栓1,使夹角为120°的三个夹
Mine is an open pit mine, the current production of coal mining using the United States, a Canadian Denver Denver company produced GD-25C-type blasthole drilling rig. The drill pipe used in this drilling machine is a combination of seamless steel pipe and welded joints at both ends. Each drill rod length 7.6m, this drill pipe joints is a vulnerable parts, and processing more difficult. Therefore, in order to solve the machining problem of drill rod thread, we specially designed a kind of fixture which is turned by C630 lathe. 1 fixture structure fixture shown in Figure 1. The fixture utilizes a taper of 1:10 on the fixture body 2 to cooperate with the jaws to achieve precise positioning of the workpiece. In the C630 lathe with a three-jaw chuck clamping cylinder front part of the body, the cylinder surface milling angle of 120 ° of the three milling plane, with the three jaw chuck matching, milling the surface The role of non-slip turning workpiece, increasing torque. Clamp bolt 1 from the front end of the lathe spindle box with special tools to adjust. Tighten the clamp bolt 1 so that the three clamps have an included angle of 120 °