当前位置:网站9号彩票 > 新闻资讯 > 行业动态
  • 轴类零件加工的定位基准是什么?
  • 本站编辑:杭州丰达通信器材9号彩票发布日期:2018-08-29 15:21 浏览次数:
轴类加工13
 
轴类零件加工的定位基准
Positioning datum for machining shaft parts
首先是以工件的中心孔作为加工的定位基准。轴类零件加工中,各外圆表面,锥孔、螺纹表面的同轴度,端面对旋转轴线的垂直度都是位置精度的重要体现。这些表面的一般都是以轴的中心线为设计基准的,用中心孔定位,符合基准重合的原则。中心孔不仅是车削加工时的定位基准,也是其它加工工序的定位基准和检验基准,符合基准统一原则。当采用两中心孔定位时,还能在一次装夹中加工出多个外圆和端面。
First, the center hole of the workpiece is used as the positioning datum. In the machining of shaft parts, the coaxiality of the surface of each outer circle, cone hole, thread, and the perpendicularity of the end face to the axis of rotation are important manifestations of positional accuracy. Generally, these surfaces are designed with the center line of the shaft as the design datum, with the center hole positioning, in line with the principle of datum coincidence. The center hole is not only the positioning datum in turning, but also the positioning datum and inspection datum of other processing procedures, which conforms to the principle of unified datum. When two central holes are positioned, multiple outer circles and end faces can be machined in one clip.
其次是以外圆和中心孔作为加工的定位基准。这种方法有效克服了中心孔定位刚性不佳的缺点,尤其是加工较重的工件时,中心孔定位会造成装夹不稳,切削用量也不能太大。采用外圆和中心孔为定位基准就不用担心这个问题。粗加工时,采用轴的外圆表面和一中心孔作为定位基准的方法能在加工中承受较大的切削力矩,是轴类零件常见的一种定位方法。
Secondly, the outer circle and the center hole are the positioning datum for processing. This method effectively overcomes the shortcomings of poor rigidity of the center hole positioning, especially when machining heavy workpieces, the center hole positioning will cause instability in clamping, cutting parameters can not be too large. Using the outer circle and the center hole as the positioning datum, we need not worry about this problem. In rough machining, the method of using the outer surface of the shaft and a central hole as the positioning datum can withstand greater cutting torque in machining, which is a common positioning method for shaft parts.
第三是以两外圆表面作为加工的定位基准。在加工空心轴的内孔时,不能采用中心孔作为定位基准,因此应使用轴的两外圆表面作为定位基准。当加工机床主轴时,常以两支撑轴颈为定位基准,这样可以有效保证锥孔相对支撑轴颈的同轴度要求,消除基准不重合而引起的误差。
The third is to use two round surface as the positioning datum. The center hole can not be used as the positioning datum when machining the hollow shaft inner hole, so the two outer circle surfaces of the shaft should be used as the positioning datum. When machining the spindle of machine tools, the two supporting journals are usually used as the positioning datum, which can effectively ensure the coaxiality requirements of the cone holes relative to the supporting journal, and eliminate the error caused by the non-coincidence of datum.
最后是以带有中心孔的锥堵作为加工的定位基准。这种方法在空心轴的外圆表面加工中较为普遍。
Finally, cone plugging with a central hole is used as the positioning datum. This method is more common in the outer surface processing of hollow shaft.