磨削中碳钢时加工表面粗糙度研究

Study on workface roughness in machining medium-carbon steel process of grinding Wheel

讨论了砂轮在使用过程中工作表面状态的变化规律,推导了粗糙度计算公式,分析了磨削时被加工工件表面的形成过程,阐述了砂轮表面磨粒峰钝化过程和自锐性过程平稳变化的影响因素,通过理论分析和实验结果的比较,客观展示了采用模拟方法得到的工件表面粗糙度的参数和实验参数的一致性,揭示了砂轮磨削中碳钢时,不平度廓形最强烈变化发生在砂轮工作初期,应在砂轮修整后的前三个进给行程中加工掉坯件总余量的四分之三,被加工表面粗糙度参数Rm ax的变化从百分之三十到百分之五十,Sm的变化从百分十五到百分之五十等规律。

This paper discusses the state - changing law of grinding wheel workface, deduces the roughness calculation formula, analyzes the grinding face forming process, and reveals the influential factors of smooth change between worn - out and self - sharpening process of abrasive grains on the workface. Through the comparison between theoretical analysis and experimental results, it objectively lays out the consistency between parameter obtained from simulative method and experimental parameters. It also elaborates some other laws in machining process of grinding wheel on medium - carbon steel, for instance, the most intense roughness outline change takes place in the initial stages; three - quarter of total grinding allowance should be taken off in the former three feeding process after finishing the grinding wheel; the grinding face roughness parameter Rmax increases from 30% to 50%, while Sm from 15% to 50%.