孙聪,姚云龙,修世超,俞志鹏.预应力条件下系统颤振对磨削工件表面形貌的影响研究[J].表面技术,2020,49(1):326-335.
SUN Cong,YAO Yun-long,XIU Shi-chao,YU Zhi-peng.Influences of System Chatter on the Ground Workpiece’s Surface Topography under Prestress Condition[J].Surface Technology,2020,49(1):326-335 |
| 预应力条件下系统颤振对磨削工件表面形貌的影响研究 |
| Influences of System Chatter on the Ground Workpiece’s Surface Topography under Prestress Condition |
| 投稿时间：2019-03-21 修订日期：2020-01-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.01.039 |
| 中文关键词: 磨削颤振 表面形貌 动力学 非高斯分布 动态磨削力 表面轮廓高度 |
| 英文关键词:grinding chatter surface topography dynamics non-Gaussian dynamic grinding force surface height |
| 基金项目:国家自然科学基金资助项目（51775101） |
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| 中文摘要: |
| 目的 基于应力刚化效应，通过施加预应力来调节颤振强度，进而研究预应力条件下系统颤振对磨削工件表面形貌的影响规律。方法 选用45钢作为研究对象，首先建立两自由度磨削系统动力学模型，采用时域与频域相结合的方式来获得磨削系统的动力学特性。然后运用Johnson变换获得砂轮表面磨粒的非高斯分布，基于磨粒的运动轨迹和磨削系统的动态特性，建立多因素耦合型工件表面形貌的数学模型，进而获得考虑颤振因素的工件表面几何形貌。结果 预应力条件下，磨削工件表面轮廓高度在1.1~1.7 μm范围内波动，工件表面的平均轮廓高度沿着砂轮的进给方向呈增大趋势。考虑颤振因素的轮廓高度计算结果更接近测得的工件表面平均轮廓高度，随着砂轮转速的增大和进给速度的减小，工件表面的平均轮廓度降低。结论 通过对比实验与仿真条件下工件表面轮廓的高度值，发现预应力条件下系统颤振导致工件表面轮廓高度分布呈现一定的不均匀性，工件表面平均轮廓高度沿着砂轮进给方向逐渐增加。同时，颤振很大程度上降低了加工工件表面微观几何精度。在实际生产中，可采用提高砂轮转速与降低砂轮进给速度的方式来减小颤振对预应力磨削工件微观表面轮廓高度的影响。 |
| 英文摘要: |
| Based on the tension stiffening effect, the work aims to study the influence mechanism of grinding chatter on the workpiece’s surface topography by conducting the prestress to adjust the chatter strength. The 45 steel was selected to be the research object. A two-degree grinding system’s dynamic model was established firstly. Meanwhile, the time domain method and the frequency domain method were combined to calculate the dynamic characteristic of the grinding system. Moreover, the non-Gaussian distribution of the wheel’s grits was obtained by Johnson transformation. Based on the grits’ movement trajectory and the grinding system’s dynamic characteristics, a surface topography mathematic model coupled with multi-factors was established accordingly to further obtain the workpiece’s surface topography in consideration of the grinding chatter factor. The workpiece’s microscopic surface height varied from 1.1~1.7 μm under prestress condition. Moreover, the average surface height increased along with the wheel’s feeding direction. The calculated workpiece’s surface height was closer to the measurement average data. Moreover, the workpiece’s surface height decreased with the increase of the wheel’s rotation speed, but it went up with the increase of the wheel’s feeding rate. By comparing with the workpiece’s surface height between the experiment and the simulation, it can be found that grinding chatter can lead to inconsistency of the workpiece’s surface topography distribution. The workpiece’s microscopic surface height increases along with the wheel’s feeding direction. Meanwhile, the grinding chatter can enlarge the workpiece’s surface height to a large extent. Therefore, the influential effect of grinding chatter on the workpiece’s microscopic surface height can be weakened by increasing the wheel’s rotation speed and decreasing the wheel’s feeding rate in the actual prestress grinding process. |
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