Method for evaluating uncertainty of torque wrench measuring result

Abstract

The invention discloses a method for evaluating the uncertainty of a torque wrench measuring result, comprising the following steps of: firstly, putting a torque wrench to be measured into a measurement system to measure the measured value of the torque wrench, and carrying out statistics on all uncertainty components which influence the measuring result; indicating the repeatability-introduced standard uncertainty component u1; and according to the instrument and sensor-introduced standard uncertainty component um, and the torque wrench-introduced standard uncertainty component uw, evaluating the standard uncertainty component u8 introduced by the error of a torque wrench setting value, the environment factor-introduced standard uncertainty component u9, and the torque loading device-introduced standard uncertainty component ul, synthesizing the standard uncertainty u6 equal to the square root of sum of the square of u1, um, uw, u8, u9 and ul, and computing the spreading uncertainty U=k u6 (k=2). According to the method, each uncertainty component introduced by the torque loading device is wholly analyzed in a quantization way, and the repeatability and the careless omission can be avoided, so that the problems of imperfection and inaccuracy when the uncertainty of a torque wrench standard evaluating device (a torque wrench standard evaluating apparatus) is evaluated and the uncertainty of the torque wrench measuring result is evaluated can be solved.

Description

technical field The invention relates to the field of measurement testing and statistics, in particular to a quantitative analysis method for the standard uncertainty of a torque loading device in the evaluation of the uncertainty of the measurement result of a torque wrench. Background technique Torque wrench is a measuring instrument for the assembly and maintenance of mechanical equipment in industrial production. It has accuracy requirements. In industrial production of different applications, torque wrench is selected according to the accuracy level and production technical requirements to measure and control the torque of tightening bolts. value. High-precision torque wrenches such as class 1 are often used to recheck the torque value of tightening bolts. Torque wrenches must be regularly measured and verified using standard instruments and equipment, which is the torque wrench standard verification device (or torque wrench standard verification instrument). Accordi...

AI Technical Summary

Problems solved by technology

5. Uncertainty components introduced by environmental factors

Although all countries in the world, especially western industrial countries, attach great importance to the quality of bolted connections, they have repeatedly innovated the design of torque wrench, and the torque wrench calibrator is also constantly updated to improve measurement accuracy and reduce the uncertainty of measurement results, but the torque wrench standard The evaluation of the uncertainty of the verification device, or the evaluation of the uncertainty of the measurement result of the torque wrench, or the completeness and accuracy of the evaluation of the uncertainty of the indication error of the measurement result of the torque wrench has not been broken through. The uncertainty of the torque loading device The component is not included to make it incomplete, and the estimated uncertainty is inaccurate