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在断续切削奥氏体不锈钢时,刀具的粘结破损严重,降低了刀具的耐用度和生产效率,并且影响加工表面质量。为此,本文探讨了硬质合金刀具在断续切削奥氏体不锈钢时粘结破损的机理,以寻求减少刀具破损的途径。借助电子探针和摄影体视显微镜,观察刀片的破损形貌,并对其破损的机理进行了理论分析,认为:刀具的粘结破损是粘结和扩散综合作用的结果,扩散加剧了粘结破损。同时,建立了冷焊—粘结—裂纹—破断的粘结破损过程模型,提出了减少粘结的具体措施。
In the intermittent cutting of austenitic stainless steel, the tool bond damage is serious, reducing the tool durability and production efficiency, and affect the processing of surface quality. For this reason, this paper explores the mechanism of cemented carbide cutting tool in the intermittent cutting of austenitic stainless steel, in order to seek ways to reduce the tool breakage. By means of electron probe and photomicroscope, the damage morphology of blade was observed and the mechanism of its damage was theoretically analyzed. It is concluded that the bond damage of cutting tool is the result of the combination of bonding and diffusion. The diffusion aggravates the bonding damaged. At the same time, a model of cold-weld-bond-crack-fracture bond failure was established, and specific measures to reduce the bond were proposed.