基于表面摩擦性能的硬质合金球头铣刀微织构优化

发布时间：2018-05-01 23:46

本文选题：摩擦性能 + 硬质合金　；参考：《哈尔滨理工大学》2016年硕士论文

【摘要】：近年来仿生学和摩擦学研究结果表明,物体具有一定规则尺寸的形态表面具有更好的摩擦性能。国内外学者研究发现高性能的表面微织构具有减摩、抗黏附和提高耐磨性能的作用,给刀具加工难加工材料带来了新的研究方向。针对微织构刀具的应用和微织构刀具切削性能的研究尚处于起步阶段,大多集中在车削刀片以及可转位面铣刀片上,其研究内容集中在刀具切削性能以及微织构减摩机理上,尚未发现关于微织构优化的研究以及将微织构应用于硬质合金球头铣刀铣削钛合金的研究。本文主要做如下方面的研究:依据有限元分析方法,建立硬质合金-钛合金表面摩擦磨损模型,对比分析微织构副和光滑副摩擦过程应力分布规律,表明微织构具有吸收应力的作用,分析不同形式微织构摩擦副应力分布规律,获得改善摩擦性能的最优织构形式,并进行了试验验证。采用激光打标机在硬质合金刀具材料表面进行激光加工工艺试验研究,依据激光工艺参数对微织构几何参数和形貌影响规律研究,结合激光加工原理获得激光制备微织构硬质合金刀具最佳加工工艺参数。研究激光加工工艺的基础上,制备表面微织构硬质合金试件,采用UMT-2摩擦磨损试验机,以球-面高副接触形式研究其摩擦性能,对比分析了光滑表面、微坑织构表面、沟槽织构表面、交叉沟槽织构表面分别在干摩擦和填充固体润滑剂条件下摩擦性能。分析不同微坑织构参数对摩擦系数影响规律以及硬质合金微织构表面磨损形貌,揭示微坑织构减摩机理。依据试验数据采用正交回归法构建硬质合金微织构表面摩擦系数优化模型,并对回归方程系数进行显著性检验,获得微织构最佳几何参数;采用渐变式载荷施加方式,对硬质合金微织构球头铣刀结构强度进行分析,结果表明微织构置入对硬质合金球头铣刀影响较小;在前期研究基础上制备硬质合金微织构球头铣刀,进行铣削钛合金试验,结果表明微织构具有降低硬质合金球头铣刀磨损、延长刀具寿命作用。
[Abstract]:In recent years, the results of bionics and tribology show that the shape surfaces with regular size have better tribological properties. Scholars at home and abroad have found that the high performance surface microtexture has the function of reducing friction, resisting adhesion and improving the wear resistance, which brings a new research direction to the cutting tools. The application of micro-texture cutting tools and the research of cutting performance of micro-texture tools are still in the initial stage, most of them are focused on turning blades and indexable face milling cutters, and the research focuses on the cutting performance of cutting tools and the friction reduction mechanism of micro-texture tools. The research on the optimization of microtexture and the application of microtexture to the milling of titanium alloy with cemented carbide ball end milling cutter have not been found. According to the finite element analysis method, the friction and wear model of cemented carbid-titanium alloy surface is established, and the stress distribution in the friction process of microtexture pair and smooth pair is compared and analyzed. It is shown that microtexture has the function of absorbing stress. The distribution of stress in friction pairs of different forms of microtextures is analyzed and the optimum texture form to improve the friction performance is obtained and verified by experiments. The laser machining process on the surface of cemented carbide cutting tools was studied by laser marking machine. The influence of laser process parameters on the geometric parameters and morphology of microtexture was studied. According to the principle of laser machining, the optimum processing parameters of microtexture cemented carbide tools prepared by laser are obtained. Based on the study of laser processing technology, the surface microtextured cemented carbide specimens were prepared. The friction and wear properties of the specimens were studied by using UMT-2 friction and wear tester. The smooth surface and the micropit texture surface were compared and analyzed. The friction properties of grooved texture surface and cross groove texture surface are respectively under dry friction and filling solid lubricant. The effects of different parameters of microcrater texture on friction coefficient and wear morphology of cemented carbide microtexture were analyzed to reveal the mechanism of friction reduction of microcrater texture. According to the test data, the optimum model of friction coefficient of cemented carbide microtexture surface is constructed by orthogonal regression method, and the coefficient of regression equation is tested significantly to obtain the best geometric parameters of microtexture. The structural strength of cemented carbide microtextured ball end milling cutters is analyzed. The results show that microtexture placement has little effect on cemented carbide ball end milling cutters. The results show that the microtexture can reduce the wear of cemented carbide ball end milling cutter and prolong the tool life.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG714

【引证文献】