International Journal of Mechanical Engineering

Measurement uncertainty is a concept introduced in machining measurement values. Generally, it is necessary to control the uncertainty in machining measurement of mechanical parts within a certain range, so as to fully guarantee the reliability and objectivity of measurement results of mechanical parts. In this paper, firstly, the concept and source of measurement uncertainty are introduced, and the factors affecting measurement uncertainty are discussed from many aspects, such as measurement methods and measuring instruments. According to the actual cases, in the process of measuring mechanical parts, the measurement method should be based on the dimensional accuracy requirements of parts, and fully combined with the measurement uncertainty and the propagation law of measurement uncertainty The scientific selection of testing instruments can effectively improve the accuracy of machining and testing results of mechanical parts and the quality of mechanical products.

machining; Measurement uncertainty; Measuring instruments