预应力淬硬磨削复合加工表层硬化试验研究

融合了预应力磨削与磨削淬硬技术原理,提出一种预应力淬硬磨削技术方法.以工件淬硬层组织形貌、分布特征、厚度、硬度等为研究对象,开展预应力淬硬磨削复合加工试验研究,并与单纯磨削淬硬试验结果对比分析.结果表明,相同加工条件下,预应力淬硬磨削加工表面在宏观上具有与磨削淬硬加工表面相同的金相组织形貌与分布,组织为亚温淬火组织.与磨削淬硬工艺相比,预应力淬硬磨削工艺对磨削热具有更强的抑制作用;预应力淬硬磨削试件的淬硬层硬度、厚度略小于磨削淬硬试件,但表面硬度可以达到常规完全淬火硬度;该研究工作可为开发预应力淬硬磨削工艺及工件表面质量控制技术提供理论与实验基础.

Study of the Surface Hardening in Pre-stressed Hardening Grinding Combined Machining

Blending the principle of pre-stressed grinding and grinding hardening，an pre-stressed hardening grinding approach was presented. The microstructure， distribution characteristics， thickness and hardness of the grinding hardening layer were studied. The results showed that under the same condition， the microstructure and distribution characteristics of grinding hardening layer in pre-stressed hardening grinding was the same as in grinding hardening and the microstructure was the subcritical quenching. Pre-stressed hardening grinding process showed more restraint effect on grinding heat. The hardening layer thickness and hardness of pre-stressed hardening grinding specimens were slightly below the grinding hardening specimens， but the surface hardness was able to reach the general complete quenching state. The research provides the experiments and principle basis for pre-stressed hardening grinding process development and work-piece surface quality control.