摘要
通过高速铣削加工实验,得出了主轴转速与工件表面显微硬度的关系图,以及显微硬度沿深度方向分布的预测模型;采用电子扫描显微镜观察高速铣削加工模具钢表面形貌图片,并分析了变质层的形成机理。结果表明,3Cr2Mo模具钢的高速铣削加工硬化程度较一般常规钢件切削小;表面加工硬化程度随主轴转速的提高略有下降;SEM图片中表面变形层厚度很小,且深度不均,有微裂纹出现,说明加工硬化对零件使用的抗疲劳性是不利的。
A relationship diagram of the spindle speed and the surface micro-hardness was obtained in high-speed milling experiments. The prediction model of micro-hardness distribution along the depth was obtained. The morphology of work hardening can be visually observed by SEM. The formation mechanism of the metamorphic layer was analyzed. The experimental results show that the steel 3Cr2Mo has a lesser work hardening degree under high-speed milling compared with conventional cutting of ordinary steel. The surface hardening has a slight decrease in the degree with the increase of spindle speed. The SEM pictures reveal the depth of the deformable layer is small and there are some micro-cracks, which indicate work hardening is disadvantageous to the part＇s fatigue resistance.
出处
《铸造技术》
CAS
北大核心
2013年第9期1154-1156,共3页
Foundry Technology
基金
山东省自然科学基金资助项目(ZR2010EM072)
山东科技大学研究生科技创新基金资助项目(YCA120332)
