Research on In-Situ Measurement Technology of NC Machining Based on Line Laser Sensor

Abstract In order to improve the machining accuracy of machine tools, it is important to obtain the geometric profile information of the parts after clamping, in order to plan the machining path again. Line laser measurement has the advantages of non-contact and large single measurement area, so it has higher measurement efficiency than traditional contact measurement. However, due to the influence of measurement environment, laser measuring angle, tested workpiece surface quality and other factors, the measurement errors of each point on the laser measuring line are different, so it is important to compensate the error and set the working parameters of the in-situ laser sensor measurement system. In this study, the influence of the line laser measuring angle factors is researched. The physical model of the laser light path is deduced based on the laser triangulation principle. Then the measuring angle compensation model can be expressed quantitatively. At the same time, the algorithm to obtain the measurement angle based on free-form surface measurement results is used, as it is an important parameter of compensation model in practical application. On this basis, a set of line laser sensor in-situ measurement process is put forward. The influence of the working environment factors on the stability of line laser in-situ measurement data is explored through experiments, such as tested workpiece surface material and ambient light intensity. The process conforms to the actual engineering requirement and provides experience reference.