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旋转体工件,特别是精密旋转体工件的加工,总是以工件的中心孔或所用芯轴的中心孔作为定位基准。在科学技术迅速发展的今天,对工件的精度要求越来越高,要求工件的圆度误差越来越小,已达到0.02～0.1微米。在实际工作中,相同工件,由同一操作工人在同一台磨床上精磨外圆,往往由于中心孔精度的差别,磨出工件的精度差异很大,由此可以看出中心孔的精度在精密加工中的重要性。一、中心孔圆度误差对精磨外圆的影响 1.中心孔圆度误差的形式中心孔圆度误差的形式是多种多样的,但具有代表性的,是双棱形(椭圆形)、三棱形、五棱形及多棱形。四以上偶数棱形的中心孔,其圆度误差的振幅,总是比相邻的奇数棱形中心孔圆度误差的振幅小。而且,五棱形以上的中心孔圆度误差的振幅不大,对精磨外圆的影响小,所以我们只研究具有代表性的二、三、五棱形中心孔。
Rotary workpieces, especially precision rotating workpiece processing, the workpiece is always the center of the hole or the central axis of the hole used as a benchmark. In the rapid development of science and technology today, the requirements for the accuracy of the workpiece is getting higher and higher, requiring the workpiece circularity error is getting smaller and smaller, has reached 0.02 to 0.1 microns. In actual work, the same workpiece, by the same operator in the same grinding machine grinding cylindrical, often due to the difference in the accuracy of the center hole, the workpiece grinding accuracy vary greatly, we can see that the accuracy of the center hole precision The importance of processing. First, the center hole roundness error on the outer cylindrical grinding 1. Center hole roundness error in the form of Center hole roundness error is a wide range of forms, but the representative is double prism (oval) , Triangular, pentagonal and polygonal. The amplitude of the roundness error of the center hole with more than four even-numbered prismatic shapes is always smaller than the amplitude of the roundness error of the adjacent odd-shaped prism center hole. Moreover, the amplitude of the circularity error of the central hole above the pentagonal shape is small, and the influence on the outer periphery of the fine grinding wheel is small, so we only study the representative two, three and five prism center holes.