超声辅助磨削硬脆材料芯棒直径预测模型

发布时间：2018-06-08 21:19

本文选题：硬脆材料 + 超声辅助磨削　；参考：《光学精密工程》2017年08期

【摘要】：超声辅助磨削是一种套料芯棒加工方法,而硬脆材料在超声辅助磨削加工过程中的去除模式主要为脆性断裂,这将导致加工出的芯棒直径与砂轮内径之间存在尺寸误差。针对上述问题,通过分析超声辅助磨削加工中砂轮表面金刚石磨粒的运动轨迹,运用压痕断裂力学理论建立了超声辅助磨削芯棒的直径预测模型。该模型考虑了脆性材料断裂时产生的侧位裂纹扩展对芯棒直径的影响。通过对K9光学玻璃材料进行超声辅助套料试验对模型进行了标定和验证,接着研究了进给速度和转速对芯棒直径误差的影响规律。通过对比研究发现,模型计算结果与试验结果吻合较好,误差小于5%,验证了模型的有效性。试验结果表明,采用适当的低转速和大进给速度可以有效降低超声辅助磨削芯棒直径的尺寸误差。本文所建模型可为超声辅助磨削套料芯棒的砂轮选择提供理论指导。
[Abstract]:Ultrasonic assisted grinding is a kind of dressing mandrel machining method, while the removal mode of hard and brittle materials in ultrasonic assisted grinding process is mainly brittle fracture, which will lead to the dimension error between the diameter of the mandrel and the inner diameter of grinding wheel. Aiming at the above problems, the diameter prediction model of ultrasonic assisted grinding mandrel was established by analyzing the movement track of diamond abrasive particles on the surface of grinding wheel and applying the theory of indentation fracture mechanics. The influence of lateral crack propagation on the diameter of mandrel is considered in this model. The model was calibrated and verified by ultrasonic assisted jacking test on K9 optical glass material. Then the influence of feed speed and rotation speed on the diameter error of mandrel was studied. It is found that the model results are in good agreement with the experimental results, and the error is less than 5. The validity of the model is verified. The experimental results show that the dimension error of ultrasonic assisted grinding mandrel diameter can be effectively reduced by using proper low speed and large feed speed. The model in this paper can provide theoretical guidance for grinding wheel selection of supersonic-assisted grinding of jacketed mandrel.
【作者单位】：大连理工大学精密与特种加工教育部重点实验室;
【基金】：高档数控机床与基础制造装备国家科技重大专项(04专项)课题(2016ZX04002005) 国家重点研发计划项目(2016YFB1102205) 国家商用飞机制造工工程技术研究中心创新基金(COMAC-SFGS-2016-33239)
【分类号】：TQ171.68

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