微织构AlCrN涂层刀具的制备与性能研究
[Abstract]:Based on the combination of surface coating technology and surface texture technology, the design idea of micro-texture AlCrN coated tool is put forward in this paper. Firstly, AlCrN coatings were prepared on the surface of YS8 cemented carbide by vacuum cathode arc ion plating, and then microtextures were prepared on the surface of AlCrN coatings by fiber laser. The friction and wear properties and cutting properties of microtextured AlCrN coated tools are systematically studied, and the antifriction mechanism of the tool is analyzed. AlCrN coating was deposited on YS8 cemented carbide substrate by vacuum cathode arc ion plating. The effect of laser processing parameters on the quality of AlCrN coating was analyzed through the experiment of nanosecond laser processing of microtexture on the surface of AlCrN coating. The optimum technological parameters of microtexture were obtained: pulse power 14 W, laser scanning speed 150 mm/s, laser scanning frequency 40 kHz, scanning times once. The microtexture was prepared on the surface of AlCrN coated tool by the obtained optimum microtexture process parameters. The corresponding microtexture width is about 25 渭 m and the depth is about 26 渭 m. Four kinds of different samples were prepared, that is, the (A); microtexture of the W / YS8 cemented carbide sample YS8 cemented carbide specimen (B) AlCrN coated sample (C); microtexture AlCrN coated sample (D). The friction and wear characteristics of microtextured AlCrN coating were investigated by ball disk contact friction and wear test. The results show that when the sliding speed is changed and the friction coefficient tends to be stable, the order of friction coefficient from small to large is DX BU A, and CfD, that is, samples with AlCrN coating, can reach stable state more quickly. The friction coefficient of sample D is the smallest, and the friction coefficient of sample B is smaller than that of sample C, and the friction coefficient of sample B is smaller than that of sample C. when the friction coefficient of sample D is stable, the friction coefficient of sample B is smaller than that of sample C. when the friction coefficient of sample D is stable, the friction coefficient of sample B is smaller than that of sample C. The friction coefficient of sample D was significantly lower than that of dry friction, which indicated that the combination of microtextured AlCrN coating and solid lubricant could effectively improve the antifriction properties of AlCrN coating surface. Two kinds of microtexture AlCrN coated tools with groove morphology, linear microtexture AlCrN coated tool (MCT) and circular arc microtexture AlCrN coated tool (RCT)., were prepared. The cutting properties of AISI660 austenitic precipitated hardened stainless steel turning with microtextured AlCrN coated tools were studied by comparing with (TT) of conventional AlCrN coated tools. The results of cutting experiments show that under the same cutting conditions, the cutting force and cutting temperature can be reduced effectively by TT and RCT cutters. The cutting force of MCT tool is 10 -30 lower than that of TT tool, and the cutting temperature is 5% -15% lower than that of TT tool. In addition, the wear degree of the front and back face of MCT and RCT tools were improved obviously, among which the stainless steel bonding of MCT tool was the least. The mechanism of microtexture to improve the cutting performance of AlCrN coated tool is as follows: first, the existence of microtexture can reduce the contact length of chip, so it can effectively reduce the friction force; second, the microtexture can store the chip produced in the cutting process. The wear of abrasive particles caused by the friction of chips on the front of the tool surface is alleviated by the change; third, the microtexture acts as an oil chamber in the cutting process, so that the lubricating fluid stored in the microtexture can be continuously replenished to the contact area of the chip, thus providing lubrication. Reduce the effect of surface wear.
【学位授予单位】:山东大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TG711;TG174.4
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