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In-situ roundness measurement and correction for pin journals in oscillating grinding machines

机译：摆动磨床中销轴颈的原位圆度测量和校正

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摘要

In the mass production of vehicle-engine crankshafts, pin chasing grinding using oscillating grinding machines is a widely accepted method to achieve flexible and efficient performance. However, the eccentric movement of pin journals makes it difficult to develop an in-process roundness measurement scheme for the improvement of contour precision. Here, a new in-situ roundness measurement strategy is proposed with high scanning speed. The measuring mechanism is composed of a V-block and an adaptive telescopic support. The swing pattern of the telescopic support and the V-block is analysed for an equal angle-interval signal sampling. Hence roundness error signal is extracted in frequency domain using a small-signal model of the V-block roundness measurement method and the Fast Fourier Transformation. To implement the roundness data in the CNC coordinate system of an oscillating grinding machine, a transformation function is derived according to the motion model of pin chasing grinding methodology. Computer simulation reveals the relationship between the rotational position of the crankshaft component and the scanning angle of the displacement probe on the V-block, as well as the influence introduced by the rotation centre drift. Prototype investigation indicates the validity of the theoretical analysis and the feasibility of the new strategy.
机译：在汽车发动机曲轴的批量生产中，使用摆动磨床的销钉追针磨削是一种广泛接受的方法，可以实现灵活高效的性能。然而，销轴颈的偏心运动使得难以开发用于改善轮廓精度的加工中圆度测量方案。在此，提出了一种具有较高扫描速度的新的原位圆度测量策略。测量机构由一个V型块和一个自适应伸缩支架组成。分析伸缩式支撑架和V形块的摆动模式，以获得相等的角度间隔信号采样。因此，使用V块圆度测量方法的小信号模型和快速傅立叶变换在频域中提取圆度误差信号。为了在摆动式磨床的CNC坐标系中实现圆度数据，根据销钉追针磨削方法的运动模型导出了一个转换函数。计算机仿真揭示了曲轴组件的旋转位置与V形块上的位移探头的扫描角度之间的关系，以及旋转中心漂移带来的影响。原型研究表明理论分析的有效性和新策略的可行性。

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