4Cr13不锈钢芯轴是录音机的关键零件,热处理质量要求很严格,我们对其常规处理的某些环节进行了改进,满足了热处理质量要求。1.技术要求轴的成品尺寸为φ2.5~(-0.0004)×46mm,经长期使用后,直经的变形量不得超过0.0004mm 否则将增大音频失真。热处理后允许变形必须控制在磨削余量半径0.15mm 之内, 4Cr13 stainless steel mandrel is the key part of the recorder, heat treatment quality requirements are very strict, we have some of its conventional processing has been improved to meet the quality requirements of heat treatment. 1. Technical requirements Shaft finished size φ2.5 ~ (-0.0004) × 46mm, after long-term use, the deformation should not exceed the direct 0.0004mm or it will increase the audio distortion. Allowable deformation after heat treatment must be controlled within the grinding allowance radius of 0.15mm,