| 氟金云母表面形成机理及表面粗糙度理论模型 |
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| 引用本文： | 陈景强,马廉洁,孟博,周云光. 氟金云母表面形成机理及表面粗糙度理论模型[J]. 中国机械工程, 2020, 31(24): 2918. DOI: 10.3969/j.issn.1004-132X.2020.24.003 |
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| 作者姓名： | 陈景强 马廉洁 孟博 周云光 |
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| 作者单位： | 1.东北大学机械工程与自动化学院，沈阳，1108192.东北大学秦皇岛分校控制工程学院，秦皇岛，066004 |
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| 基金项目： | 国家自然科学基金资助项目(51975113，51905083)；河北省自然科学基金资助项目(E2019501094) |
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| 摘 要： | 根据车削动力学理论，先后求出前刀面和后刀面的接触应力，进而确定裂纹尖端应力强度因子；基于断裂力学理论，确定了尖端裂纹扩展角；分析表面形成微观机理，根据车削中刀具与工件的干涉关系，建立表面粗糙度理论模型，并利用被加工表面实际面积和投影面积比值K，提出脆性材料粗糙度理论修正模型；通过单因素氟金云母车削实验验证该模型精度。结果显示：随着切削速度、进给量和切削深度的增大，材料发生塑脆转变，表面粗糙度随着切削速度和进给量的增加先减小后增大、随着切削深度的增大而增大；在塑性去除情况下预测结果与实验值趋势相反，在脆性去除情况下理论预测值与实验值趋势相同。修正后粗糙度模型精度较修正之前明显提高，证明修正后模型是可靠的。
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| 关 键 词： | 裂纹扩展角 表面粗糙度 损伤因子 氟金云母 |
Surface Formation Mechanism and Surface Roughness Theoretical Model of Fluorophlogopite |
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| CHEN Jingqiang,MA Lianjie,MENG Bo,ZHOU Yunguang. Surface Formation Mechanism and Surface Roughness Theoretical Model of Fluorophlogopite[J]. China Mechanical Engineering, 2020, 31(24): 2918. DOI: 10.3969/j.issn.1004-132X.2020.24.003 |
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| Authors: | CHEN Jingqiang MA Lianjie MENG Bo ZHOU Yunguang |
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| Affiliation: | 1.School of Mechanical Engineering & Automation,Northeastern University,Shenyang,1108192.School of Control Engineering,Northeastern University at Qinhuangdao,Qinhuangdao,Hebei,066004 |
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| Abstract: | According to the turning dynamics theory, the contact stress of the rack face and flank surface were calculated, then the stress intensity factor of the crack tips was determined. The crack growth angle of the tip was determined based on the fracture mechanics theory. The microscopic mechanism of surface formation was analyzed, and the theoretical model of surface roughness was established according to the interference relationship between cutting tool and workpiece in turning. The accuracy of the model was verified by a single factor turning experiment of fluorophlogopite. The results show that with the increase of cutting speed, feed and cutting depth, the plastic-brittle transition occurs. The surface roughness decreases firstly and then increases with the increase of cutting speed and feed, and increases with the increase of cutting depth. Under the conditions of plasticity removal, the predicted values are opposite to the experimental ones, and under the condition of brittleness removal, the predicted values are the same as the experimental ones. The accuracy of the roughness model is improved obviously. It is proved that the modified model is reliable. |
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| Keywords: | crack growth angle surface roughness injury factor fluorophlogopite |
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