论文部分内容阅读
磨削发动机气门挺杆球面时,在挺杆球面专用磨床上若采用普通三瓣卡爪弹簧夹头(图1)装夹,磨出的挺杆球面对杆部的摆差值往往超出技术要求(图2),甚至达0.10毫米(装夹后实测杆部与主轴同轴度偏差0.05～0.07毫米)。这是因为夹头是借助于带内锥面的螺套1拧紧时,内锥面使主轴端部的弹性夹块变形而夹紧工件。可是螺套拧紧前后,它与主轴的同轴度是不能保证的。这样,弹性夹块的变形程度会不尽相同,因而容易造成工件和主轴的回转轴线不重合,装夹精度也就不稳定。
When grinding engine valve lifter spherical surface, if the common three-jaw claw spring collet (Figure 1) clamps on the special sprocket spherical grinder, the difference between the tapped spherical surface and the shaft of the tappet often exceeds the technical Requirements (Figure 2), and even up to 0.10 mm (measured after clamping rod and spindle coaxiality deviation 0.05 ~ 0.07 mm). This is because when the chuck is tightened by means of a tapered sleeve 1, the inner conical surface deforms the clamping jaws at the ends of the spindle to clamp the workpiece. However, before and after the screw sleeve tighten it with the coaxiality of the spindle can not be guaranteed. In this way, the degree of deformation of the elastic clamping block will not be the same, which is likely to cause the workpiece and the spindle axis of rotation does not overlap, the clamping accuracy is not stable.