一、前言随着对微电机、录音机等需求量的不断增加,精密小轴的产量也随之增加,对小轴的精度要求也越来越高,例如图1所示的某种录音机小轴对精度和表面粗糙度的要求都很高,直线度为1～3μm,园度为0.3～0.5μm,直径公差为0.002～0.006μm,长径比很大,这类精密小轴国内已有不少厂 I. INTRODUCTION With the increasing demand for micromotors, sound recorders and so on, the production of precision small shafts also increases, and the precision of small shafts is also getting higher and higher. For example, as shown in Figure 1, The requirements for precision and surface roughness are very high. The straightness is 1 ~ 3μm, the gardenity is 0.3 ~ 0.5μm, the diameter tolerance is 0.002 ~ 0.006μm, and the aspect ratio is very large. Less plants