录音机机芯尤其是按键部件有不少是冲压件,按键冲压件的毛刺使相对滑动的阻力增加,而且不稳定,超过国家标准,按键时声音响,成为一个难题。国内大多数录音机机芯生产厂的冲压件都是不去毛刺就装配,只有少数厂采用滚筒工艺去毛刺,这种工艺效率低,处理效果差,容易使零件变形。 In particular, the recorder movement is a key part of a number of stamping parts, the press button burr so that the relative sliding resistance increases, and unstable, more than the national standard, when the keys sound sound, become a problem. Most domestic manufacturers of tape recorders movement of the stamping parts are not burr on the assembly, only a small number of factories to use burr to deburring, this process is inefficient, poor treatment, easy to make the parts deformed.