基于赫兹理论的弹性磨具磨抛M300钢表面参数模型研究

发布时间：2018-12-12 16:32

【摘要】：目的由于弹性磨具与曲面接触特征的多样性,导致弹性磨具呈非常量磨损,使磨具的磨抛工况变得复杂,磨抛参数对表面精度的影响没有得到理论上的阐释,通过实验研究磨削过程的磨削参数变化规律与加工表面残留峰移除量的理论关系。方法针对M300钢高耐磨性的特点,通过对球头弹性磨具(油石)的微观接触分析,根据赫兹理论接触应力分布特点,数学推导得出在平面情况下残留峰移除率与影响磨削精度的主要参数的函数关系。结果根据磨削参数变化规律,考虑进给速度的变化,得出任一点的残留峰置的变化量为接触半径减去球头在一定位置下通过的距离,并推导出移除率Q=dh/dt=CPmατnα的预估参数值。根据最小二乘法算得当m=-3,n=-2时,C=1.55×105,移除面积与磨抛参数成正相关。结论通过磨削实验确定移除率待定参数值,从理论上确定影响磨削质量的法向压力和切应力对残留峰移除高度的影响,为曲面磨削弹性预估补偿研究提供参考。同时应适当减小弹性模量,增大法相压力及球头磨具半径,使得进给量增大,减小磨损,提高磨削效率。
[Abstract]:Aim due to the diversity of contact characteristics between elastic abrasive tools and curved surfaces, elastic abrasive tools are worn in a constant amount, which makes the grinding conditions of abrasive tools become more complex, and the influence of grinding parameters on surface accuracy is not explained in theory. The theoretical relationship between the grinding parameters and the removal of residual peak in the grinding process is studied experimentally. Methods according to the characteristics of high wear resistance of M300 steel, according to the characteristics of contact stress distribution in Hertz theory, the microcosmic contact analysis of ball head elastic abrasive tool (oil stone) was carried out. The function relationship between the removal rate of residual peak and the main parameters affecting grinding accuracy is obtained by mathematical derivation. Results according to the law of grinding parameter change and considering the change of feed velocity, the change of residual peak is obtained as contact radius minus the distance of ball head passing at a certain position, and the estimated parameter value of removal rate Q=dh/dt=CPm 伪蟿 n 伪 is deduced. According to the least square method, the area removed is positively correlated with the polishing parameters. Conclusion the parameter value of removal rate is determined by grinding experiment, and the influence of normal pressure and shear stress on the removal height of residual peak is theoretically determined, which provides a reference for the research of surface grinding elastic prediction compensation. At the same time, the elastic modulus should be reduced, the normal phase pressure and the radius of the ball head should be increased, the feed rate should be increased, the wear should be reduced, and the grinding efficiency should be improved.
【作者单位】：西安建筑科技大学机电工程学院;
【基金】：国家自然科学基金(51375361)~~
【分类号】：TG74;TG580.6

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