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我厂生产的液压马达中有一个零件的两端各有一个孔,这两个孔的同心度和两个面的平行性要求都较高(图1)。过去采用传统的加工方法,即使用四爪卡盘夹紧外圆或胀紧内孔,先车好一个端面上的内孔、外圆和端面,然后翻面用百分表校正内外圆和端面再车。这种加工方法很难保证产品质量,返修率达40%。后来我们设计制造了锥度胀紧夹具,用它加工出来的零件都能达到技术要求,质量稳定,工作效率成倍提高。锥度胀紧夹具由夹具座、锥度芯轴、胀紧滑块(6块)、固定螺母和上压盖等组成(见图2)。它的原理主要是旋转锥度芯轴时,芯轴就产生轴向运动,芯轴上的圆锥就推动六块胀紧滑块滑移,实现对工件的胀紧和松开、代替了使用卡盘夹持工件,同时克服了由于卡爪施力不匀而产生的工件变形现象。这样,工件一
I have a factory in the hydraulic motor has a hole at both ends of the two parts, the two holes concentricity and the parallelism of both faces are higher (Figure 1). In the past using the traditional processing method, that is, using a four-jaw chuck to clamp the outer circle or expansion of the hole, the first car on a good end of the hole, the outer circle and the end surface, and then dial the dial with the inner and outer circle and end surface correction Car again. This processing method is difficult to ensure product quality, repair rate of 40%. Later, we designed and manufactured taper expansion clamp, with which the parts machined out can meet the technical requirements, the quality is stable and the working efficiency is doubled. Taper expansion clamp by the fixture holder, taper mandrel, expansion slider (6), the fixing nut and the gland and other components (see Figure 2). Its principle is mainly to rotate the taper mandrel, the mandrel to produce axial movement, mandrel on the cone to promote six expansion slider slip, to achieve the workpiece expansion and release, instead of using the chuck Clamping the workpiece, at the same time to overcome due to uneven jaw force generated artifacts deformation. In this way, the workpiece one