Material Removal Model and Parameter Calibration for Grinding of Parts with Curve Surface
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摘要: 影响磨抛质量的工艺参数较多使得叶片的材料去除量难以控制。针对圆柱形磨头，在已有材料去除模型的基础上，建立了新的材料去除模型。其中接触力的二分之一次幂、切触速度的倒数以及主轴转速与单位面积材料去除量成正比，并将其他不可控因素建模为材料去除系数; 以棒料作为实验对象，考虑工艺参数对单位面积材料去除量的影响，进行多组单因素实验。根据实验数据，利用最小二乘法对模型进行参数标定; 再通过多组多因素实验对材料去除模型进行验证。结果表明，所提出的材料去除模型准确可靠。Abstract: There are many factors affecting the grinding quality, which make it difficult to control the material removal. Based on the existing material removal models, a new material removal model is established which mainly aimed at cylindrical grinding tool. In the model, the half power of contact force, reciprocal of contact velocity and spindle speed are directly proportional to material removal per unit area. The other uncontrollable factors are modeled as a material removal coefficient. A series of single factor experiments are carried out on the cylinder bar which considering the effect of grinding process parameters on material removal per unit area. Then the material removal coefficient is calibrated according to the experimental data. Finally, the material removal model is also validated by a series of multi-factor experiments. The results show that the proposed material removal model is accurate and reliable.
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Key words:
- parameter calibration /
- curved surface parts /
- material removal model /
- experiments
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表 1 实验装置及性能参数
实验装置 品牌 性能参数 控制器 倍福(C6920) 电主轴 迎风主轴(S4225-B40FL8) 最大转速40 000 r/min 移动平台 NSK 行程50 mm×50 mm 伺服电机 迈信(EP3E) 功率200 W 转台伺服电机 松下 功率400 W 力传感器 三维力恒传感(LH-SZ-02) 量程100 N 转台 凯力赛微 承载100 kg 三爪卡盘 亿川(sc03) 夹持范围2~70 mm 
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表 2 变接触力磨抛实验参数
影响因素 数值 接触力/N 1、2、3、4、5 切触速度/(mm·s-1) 3 主轴转速/(r·min-1) 6 000 砂带粒度 P600 磨抛圈数 5 棒料半径/mm 4.5
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表 3 变切触速度磨抛实验参数
影响因素 数值 接触力/N 3 切触速度/(mm·s-1) 1、1.1、1.2、1.3、1.4、1.5、
1.6、1.8、2、3、4、5主轴转速/(r·min-1) 5 000 砂带粒度 P600 磨抛圈数 5 棒料半径/mm 5
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表 4 变主轴转速磨抛实验参数
影响因素 数值 接触力/N 3 切触速度/(mm·s-1) 3 主轴转速/(r·min-1) 3 000、4 000、5 000、6 000、7 000 砂带粒度 P600 磨抛圈数 5 棒料半径/mm 5
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表 5 多因素磨抛实验参数
次数 F/N Vt/(mm·s-1) Vr/(r·min-1) 1 1.5 1.5 5 000 2 1.5 3.5 4 500 3 2 1 4 000 4 2 4 6 500 5 3 2 5 500 6 2.5 2.5 5 500 7 3.5 2.5 6 000 8 3.5 3.5 6 500
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