齒輪材料18CrNiMo7-6高速磨削工藝試驗研究
[Abstract]:Gear is the key part of transmission system. It is widely used in mechanical transmission because of its high transmission efficiency, wide range of speed change and large transmission ratio. The common failure forms of gear are tooth root bending fatigue and tooth surface contact fatigue, and these failures usually occur on the tooth surface or tooth root surface. Therefore, the surface quality of gears is particularly important. Surface integrity determines the service performance of components, including surface state and surface performance, and surface roughness and hardness are important indexes. Since the service performance of gears mainly includes long life and low noise, these requirements should be integrated in the design to select the appropriate processing technology. High speed grinding is a kind of technology to achieve higher grinding removal rate and better grinding quality by raising the linear speed of grinding wheel. It is a revolutionary leap of grinding technology. The grinding process of grinding wheel with linear speed of 45~150m/s is often called high-speed grinding. The finishing process of gear tooth surface machining is usually grinding, and because of the limitation of technical conditions, the grinding speed of gear in actual machining has not reached high speed grinding. Therefore, the related mechanism of gear material high speed grinding is explored. It has profound guiding significance for gear grinding technology. In this paper, high speed grinding experiments for 18CrNiMo7-6 Carburizing and quenching gear steel are carried out. The main contents are as follows: 1) the grinding force, specific grinding energy and grinding parameters (linear speed of grinding wheel) are analyzed. Based on the relationship between grinding depth and worktable speed, the empirical formula of grinding force is established by means of angle positive regression method, and the quantitative relationship between grinding parameters and grinding force is determined. 2) based on AdvantEdge cutting simulation software, The single particle simulation model is established, and the grinding process is simulated and analyzed, and the simulation results are compared with the experimental results. The correctness of the simulation model is proved. 3) the influence of high speed grinding parameters on the evaluation index of surface integrity is discussed. The surface quality of 18CrNiMo7-6 Carburizing quenched gear steel under different technological conditions was tested by using 3D profilometer and microhardness meter. The surface roughness and hardness were investigated as two objective functions. The variation of surface roughness and hardness of 18CrNiMo7-6 Carburizing quenched gear steel in high speed grinding was obtained. Thus, the selection of grinding parameters for 18CrNiMo7-6 gear steel in high speed grinding process is provided.
【學(xué)位授予單位】:鄭州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TG616
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