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首页> 外文会议>DSC-vol.73-1; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition pt.A; 20041113-19; Anaheim,CA(US) >MEASUREMENT OF THERMALLY INDUCED LOADS IN BACK-TO-BACK ANGULAR CONTACT SPINDLE BEARINGS USING STRAIN GAUGES
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MEASUREMENT OF THERMALLY INDUCED LOADS IN BACK-TO-BACK ANGULAR CONTACT SPINDLE BEARINGS USING STRAIN GAUGES

机译：用应变片测量背对背角接触主轴轴承中的热感应载荷

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摘要

Thermally induced bearing loads can potentially create serious problems for metal cutting spindles when used at high speeds. Proper spindle bearing set-up can minimize, but cannot eliminate this problem. Measuring the thermally induced load can alert the user to a potential problem or can be used to control the load directly. The purpose of this paper is to describe the design of a thermally induced bearing load sensor using strain gauges placed around the outer race. A box spindle with strain gauges on a pair of angular contact ball bearings located in the front of the spindle is used in this analysis. In order to calculate the thermally induced bearing load, the outputs of the strain gauges were recorded over a one second interval, sampled at 7500 Hz from each strain gauge and the root mean square of the deviation of this data from its mean is calculated. This value is a measure of the ball load. This calculated output is calibrated by a quadratic regression of these data to applied axial loads over a range of 0 to 2800 N. Values for each bearing were averaged to yield a front and rear value. The repeatability error for the front bearing sensor is 1.36%, and its accuracy is 98.9%. The repeatability error for the rear bearing sensor is 2.17% and its accuracy is 98.3%. These relatively low repeatability errors are attributable in part to filtering that does reduce the sensors' bandwidth, but not significantly for measuring the relatively slowly changing thermally induced loads. Sensor design improvements and potential avenues of future research are discussed.
机译：当高速使用时，热轴承载荷可能会对金属切削主轴造成严重的问题。正确的主轴轴承设置可以最大程度地减少，但不能消除此问题。测量热引起的负载可以警告用户潜在的问题，或者可以直接用于控制负载。本文的目的是描述一个热应力轴承载荷传感器的设计，该传感器使用放置在外座圈周围的应变仪。在此分析中，使用了在主轴前部的一对角接触球轴承上装有应变片的箱形主轴。为了计算由热引起的轴承载荷，每隔一秒钟记录一次应变仪的输出，从每个应变仪以7500 Hz的频率采样，并计算出该数据与其平均值的偏差的均方根。该值是球负荷的量度。通过对这些数据进行二次回归以对施加的轴向载荷在0到2800 N范围内进行二次回归来校准此计算出的输出。将每个轴承的值取平均值，以得出前后值。前轴承传感器的重复性误差为1.36％，其精度为98.9％。后轴承传感器的重复性误差为2.17％，准确度为98.3％。这些相对较低的可重复性误差部分归因于滤波，它确实减小了传感器的带宽，但对于测量相对缓慢变化的热感应负载却影响不大。讨论了传感器设计的改进和未来研究的潜在途径。

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