表面织构对刀具切削性能及前刀面摩擦特性的影响

发布时间：2018-10-14 10:54

【摘要】：金属切削是加工机械零件的基本方法之一,在机械制造业中占有十分重要的地位。近年来随着“绿色制造”的提出,如何改善刀具切削性能、提高工件表面加工质量成为了国内外研究学者所关注的热点。本文将表面织构引入切削刀具表面,进行了织构刀具的设计和制造,研究了表面织构对于刀具切削性能、工件表面加工质量的影响以及三维形貌表征参数与织构刀具切削性能的相关性。采用YLP-F10型光纤激光打标机在YT15刀具的前刀面上进行激光微加工,得到两组表面具有微凹坑阵列的织构刀具,通过控制微凹坑的直径、深度、面积占有率等参数使得每组织构刀具表面高度算术平均值Sa相同。使用Talysurf CCI Lite接触式三维光学轮廓仪对织构表面进行测量,采用ISO25178参数对测量表面进行表征；通过SL200KS接触角测量仪测量织构刀具前刀面湿润性的变化；随后在配备Kistler9257B型三向测力仪的CA6140车床上进行45#钢切削试验,通过改变切削速度、进给量,研究了不同织构对切削力、前刀面摩擦特性、工件表面粗糙度、切屑形变的影响以及不同切削参数对于织构刀具切削性能的影响。本研究结果表明：合理的表面织构能够改善刀具的切削性能；切削液在前刀面铺展较快的织构刀具获得了较好的切削性能；不同切削参数条件下,织构表面的影响效果也不同；凹坑直径、深度、面积占有率的协同作用对改善刀具切削性能至关重要,为了协调这三个织构参数,可以进一步研究三维表征参数Sku、Ssk、Vvv、Vvc、Sdv、Sda、Spd与刀具切削性能的关联性,为刀具表面设计提供了基础。
[Abstract]:Metal cutting is one of the basic methods of machining mechanical parts and plays an important role in mechanical manufacturing. In recent years, with the development of "green manufacturing", how to improve the cutting performance of cutting tools and improve the quality of workpiece surface has become a hot topic for researchers at home and abroad. In this paper, the surface texture is introduced into the cutting tool surface, and the design and manufacture of the texture cutter are carried out, and the effect of surface texture on the cutting performance of the cutting tool is studied. The influence of machining quality on the workpiece surface and the correlation between the parameters of 3D morphology characterization and the cutting performance of textured cutting tools. Two groups of texture cutters with micropits array were obtained by using YLP-F10 fiber laser marking machine on the front of the YT15 tool. The diameter and depth of the micropits were controlled by controlling the diameter and depth of the micropits. The area occupation ratio and other parameters make the arithmetic mean value of surface height of each group of texture tools Sa the same. The texture surface was measured by Talysurf CCI Lite contact 3D optical profilometer, the surface was characterized by ISO25178 parameters, the change of wettability of tool surface was measured by SL200KS contact angle measuring instrument. After that, the experiment of 4 steel cutting was carried out on the CA6140 lathe equipped with Kistler9257B three-way dynamometer. By changing the cutting speed and feed quantity, the cutting force of different textures, the friction characteristics of the front tool face, the surface roughness of the workpiece were studied. The influence of chip deformation and different cutting parameters on cutting performance of texture cutting tools. The results show that reasonable surface texture can improve the cutting performance of the cutting tool, that the cutting fluid spreads rapidly on the front tool surface to obtain better cutting performance, and that the effect of the texture surface on the cutting parameters is different. The synergy of pit diameter, depth and area occupancy is very important to improve the cutting performance of cutting tools. In order to coordinate these three texture parameters, we can further study the relationship between the three-dimensional characterization parameter Sku,Ssk,Vvv,Vvc,Sdv,Sda,Spd and the cutting performance of the tool. It provides the foundation for tool surface design.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG711;TG174.4

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