圆柱螺旋扭转弹簧扭矩测试的影响因素

Influence Factors on Torque Testing of Cylindrical Helical Torsional Springs

分析了扭簧扭矩的测试过程，研究了芯轴直径、加载点位置、同轴度、芯轴表面粗糙度、初始力矩、加载速率等因素对扭簧扭矩测试结果的影响，给出了扭矩测试过程中以上因素的确定原则：芯轴直径可选择按GB／T23953-2005扭簧芯轴直径计算公式计算值的0．8～l倍，加载点位置可以采用距离扭臂切点0．75倍扭臂长度的位置，初始力矩可以选择待测扭矩最大值的2％～5％，加栽点位置距离测力盘端面不宜过远，芯轴及挡杆硬度应不小于40HRC，芯轴表面粗糙度应不大于1．6μm。上述影响因素的确定为扭簧扭矩测试方法标准的建立提供了重要依据。

The torque testing process of cylindrical helical torsional springs was analyzed. Some factors which influence the torque testing results were discussed, such as the mandrel diameter, the location of torgue, the coaxiality, the mandrel surface roughness, the initial torque, the loading rate and etc. The determination principles of these factors which should be considered in torque testing process were provided as following. The mandrel diameter should be chosen by the formula in GB/T 23953 2005, which should be 0. 8- 1 times of the calculated value. The location of load could be about 0. 75 times of the torsional arm length from the torsional arm tangent point. The initial torque could be chosen by 2%-5% of the measured torque maximum value. The location of load should not be too far from the measuring disc face. The hardness of mandrel and stop lever should be not less than 40 HRC. The mandrel surface roughness should be less than 1.6 μm. The above research results on torque testing method would provide important basis to the establishment of torque testing method standard.