涂层硬质合金刀具对奥氏体不锈钢的切削特性

发布时间：2018-06-02 11:19

本文选题：涂层硬质合金刀具 + 奥氏体不锈钢　；参考：《材料科学与工程学报》2016年03期

【摘要】：为了深入探究涂层硬质合金刀具切削奥氏体不锈钢的切削机理,试验采用确定的进给量和背吃刀量,只改变切削速度的单因素法,来研究切削速度对奥氏体不锈钢工件加工表面质量的影响以及涂层刀具的切削机理。采用JEOL JSM-6360LV扫描电子显微镜和EDS能谱仪对工件加工表面及磨损刀片进行表面微区磨损形貌的观察分析与组成成分分析,采用X射线衍射仪对工件表面物相组成进行分析,采用激光扫描显微镜LSM对工件表面三维形貌进行观察分析。研究表明,切削速度较低时,不锈钢材料因材质较软,断屑性能较差;速度较高时,切削过程中粘着现象严重,致使摩擦剪应力较大,摩擦表面发生形变,进而诱发不锈钢的马氏体相变。因此,宜选用中速V=85m/min进行切削,在此速度下,被加工件获得的表面质量较好,表面粗糙度Ra=3.679μm。刀具磨损主要发生在前刀面靠近刀尖的部位,磨损机理主要表现为粘着磨损。研究发现,涂层硬质合金刀具在体现出一定的良好切削性能的同时也不可避免地发生了磨损,所以深入研究其切削机理能够丰富涂层刀具的切削理论,为提高涂层刀具在切削难加工材料时的刀具寿命以及拓展其在实际切削加工中的应用范围提供试验依据。
[Abstract]:In order to probe into the cutting mechanism of austenitic stainless steel cutting with coated carbide tools, the single factor method of changing the cutting speed was used to determine the feed rate and the back feed rate. To study the effect of cutting speed on the surface quality of austenitic stainless steel workpiece and the cutting mechanism of coated tool. JEOL JSM-6360LV scanning electron microscope and EDS energy spectrometer were used to observe and analyze the wear morphology of the workpiece surface and the wear blade. The phase composition of the workpiece surface was analyzed by X-ray diffractometer. The three-dimensional surface morphology of the workpiece was observed and analyzed by laser scanning microscope (LSM). The results show that when the cutting speed is low, the chip breaking performance of stainless steel is poor because of its softer material, and when the cutting speed is high, the adhesion in the cutting process is serious, which results in the large friction shear stress and the deformation of the friction surface. Then the martensitic transformation of stainless steel is induced. Therefore, the medium speed V=85m/min is suitable for cutting. At this speed, the surface quality of the workpiece is better and the surface roughness is Ra=3.679 渭 m. Tool wear occurs mainly in the front face near the tip of the tool, and the wear mechanism is mainly adhesive wear. It is found that the coated cemented carbide tools exhibit a certain good cutting performance and wear inevitably at the same time, so further study of the cutting mechanism can enrich the cutting theory of coated cutting tools. The experimental basis is provided for increasing the tool life of coated tool in cutting difficult materials and expanding its application scope in actual cutting.
【作者单位】：陕西科技大学机电工程学院;
【基金】：国家自然科学基金资助项目(51405278) 陕西省教育厅专项科研计划资助项目(14JK1082) 陕西科技大学引进博士科研启动基金资助项目(BJ11-0)
【分类号】：TG711

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