考虑接触热导的电动扭矩扳子校准装置热特性分析  

Thermal Characteristics Analysis for Electric Torque Wrench Calibration Device with Thermal Contact Conductance

作　　者：高建卓 汪宁溪 陈龙 骆昕 GAO Jianzhuo;WANG Ningxi;CHEN Long;LUO Xin(Beijing Institute of Metrology,Beijing 100029,China)

机构地区：[1]北京市计量检测科学研究院,北京100029

出　　处：《计量学报》2024年第7期1031-1037,共7页Acta Metrologica Sinica

基　　金：国家市场监管总局科技计划(2022MK004);北京市计量院自主科研项目(KJ2023-17)。

摘　　要：为了提升动态扭矩参数的测量准确度,基于分形理论,引入接触热导参数,建立结合面接触热导模型,并进行数值仿真。同时针对典型的电动扭矩扳子校准装置,利用接触热导模型对其轴承结合部进行温度仿真并与试验结果进行对比分析。结果表明:接触热导参数分别与接触载荷和材料特性参数呈现正相关增长趋势,而与尺度参数呈现负相关增加趋势;当2.1≤D≤2.7时,接触热导参数随分形维数D的增大而增大;当2.7≤D≤2.9时,接触热导参数反而随着分形维数D的增大而减小。考虑接触热导的上、下轴承结合部最高温度均比不考虑时高出4~6℃,且与试验结果接近,相对误差分别为2.7%和3.3%。In order to improve the measurement accuracy of dynamic torque,based on fractal theory,thermal contact conductance parameter was introduced to establish thermal contact conductance model of joint surfaces,and numerical simulation was carried out.Also,for a typical electric torque wrench calibration device,the model was used to simulate the temperature of its bearing joint and compared with experimental results.The results showed that:the thermal contact conductance is positively correlated with the contact load and material properties,but negatively correlated with the scale parameters,when 2.1≤D≤2.7,the thermal contact conductance increases with the increase of fractal dimension D,when 2.7≤D≤2.9,it decreases with the increase of fractal dimension D.Considering the thermal contact conductance,the maximum temperature of the bearing joints were 4~6℃higher than that without consideration.And it was close to the experimental results,with relative errors of 2.7%and 3.3%,respectively.

关 键 词：扭矩测量 电动扭矩扳子 校准装置 接触热导 动态扭矩 结合面 数值仿真 

分 类 号：TB931[一般工业技术—计量学]