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首页> 外文期刊>Advances in Mechanical Engineering >Load Induced Error Identification and Camber Curve Design of a Large-Span Crossbeam
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Load Induced Error Identification and Camber Curve Design of a Large-Span Crossbeam

机译：大跨度梁的荷载引起的误差识别和弧形曲线设计

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摘要

Load induced errors aroused by internal masses of machine tool components and external cutting forces are a main contributor that influences machining accuracy. A mathematical model for load induced errors identification of large-span crossbeam in heavy-duty machine tool was proposed. According to the identified load induced errors, a method for optimisation of the guideway camber curve on crossbeam by particle swarm optimisation was proposed. Geometric errors of y-axis along cambered crossbeam and noncambered crossbeam were calibrated, and multibody system theory was also introduced to predict theoretically the machining accuracy of machine tool with two kinds of crossbeam. The comparisons between two kinds of crossbeam show that after cambering, the geometric errors are decreased and can meet the requirements of ISO standard, and the machining accuracy is enhanced remarkably too. In addition, the indirect dynamic straightness error of z-direction along cambered crossbeam was measured by displacement sensors, and the response results show that even though at the start-stop moment, the straightness error is also within the reasonable range of ISO standard.
机译：机床部件内部质量和外部切削力引起的负载引起的误差是影响加工精度的主要因素。提出了一种用于重型机床大跨横梁载荷引起的误差识别的数学模型。根据确定的载荷引起的误差，提出了一种通过粒子群算法优化横梁导轨弯度曲线的方法。校正了弧形横梁和非弧形横梁的y轴几何误差，并引入多体系统理论从理论上预测了两种横梁的机床加工精度。两种横梁的比较表明，弯度后，几何误差减小，可以满足ISO标准的要求，加工精度也得到明显提高。此外，通过位移传感器测量了z方向沿弧形横梁的间接动态直线度误差，响应结果表明，即使在起止时刻，直线度误差也处于ISO标准的合理范围内。

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