石墨對(duì)金屬結(jié)合劑金剛石工具性能影響的研究
[Abstract]:Metal bond diamond tools have the advantages of high bonding strength, good wear resistance and long service life. They occupy a large market in diamond products and are important tools in industrial production and development. However, the metal bond diamond tools still have problems such as low porosity, poor edge and self-sharpening. In this paper, graphite is chosen as additive to solve the problems of metal bond diamond tools. Graphite has poor bonding strength with metal binder matrix, and exists in the matrix in a free state, which can improve the porosity of the matrix, play the role of chip removal, cooling and self-sharpening, and graphite can weaken the metal bond matrix. The wear resistance of diamond abrasive is matched with the matrix of metal bond, and the comprehensive properties of diamond tools are improved. Based on the single variable method to determine the influence factors and levels of graphite, the wear ratio, mechanical properties, grinding speed and service life of metal bond diamond tools were studied by orthogonal test. By analyzing the experimental results, the following conclusions are drawn: (1) through the orthogonal test, the order of the effect of graphite on the properties of metal bond diamond tools is as follows: the content of graphite is the largest, the type of graphite is the second, and the particle size of graphite is the least; (2) through the orthogonal test, When the grain size of diamond is 70 / 80 mesh, the best scheme for the effect of graphite on the properties of copper based diamond tools is as follows: graphite type is flake graphite, graphite particle size is 80 mesh and graphite content is 3 wtlong. The maximum wear ratio of the sample was 206.62, which was 43.12 higher than that of the reference sample, and compared with the mechanical properties of the standard sample. The bending strength and hardness were reduced by 32.98% and 16.13%, respectively, while the impact strength was increased by 5.67%. (3) by orthogonal test, when the grain size of diamond was 70 / 80 mesh, The best scheme for the effect of graphite on the properties of iron-based bond diamond tools is that the graphite type is earth graphite, the graphite particle size is 120 mesh and the graphite content is 3 wts. The maximum wear ratio of the sample was 287.58, which was 3.30% higher than that of the standard sample, and the mechanical properties of the standard sample were compared with that of the standard sample. The bending strength and impact strength decreased 34.16% and 21.65%, respectively, while the hardness was almost the same. (4) the service life and sharpness of the metal bond diamond tools increased the sharpness and grinding rate of the tools. The service life is bound to be reduced. Compared with the base grinding wheel, The maximum grinding speed of copper base edge grinding wheel with graphite is increased by 7.89, and its service life is reduced by 20.63. The iron base edge grinding wheel with graphite increases 6.99 and its service life is reduced by 6.99. In this experiment, Although the service life of metal bond diamond tools is reduced, they are sufficient to meet the requirements of production and, more importantly, to increase sharpness and grinding speed by reducing their life accordingly, Improve the grinding quality of grinding objects and expand the use of metal bond diamond tools.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TQ163
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