Numerically controlled lathe-based contour laser online measurement device and method for rotary type structure characteristic parts

Abstract

The invention relates to a numerically controlled lathe-based contour laser online measurement device and a method thereof for rotary type structure characteristic parts, and designs an adjustable and detachable clamp for clamping a sensor. An assembly body is arranged on the tool rest of a lathe in the side edge positioning mode, and the position and orientation calibration of a measuring head is conducted based on a ceramic standard ball. After that, a measuring program is called, and the distance value between the curved-surface discrete point of a part and the measuring head is measured. In combination with the coordinates of the lathe, a one-dimensional distance value is converted into a three-dimensional coordinate value by adopting a compiling algorithm, and then point cloud data are obtained. The point cloud data are analyzed and processed, and a model of the point cloud data is reconstructed. Compared with a theoretical model, an error value and a generation reason thereof are analyzed. Therefore, the high-efficiency precise online measurement of the contour profile of a rotary part is realized. According to the invention, the online measurement and the error analysis for the contours of rotary type structure characteristic parts can be realized. The device and the method are fast in measurement speed and high in precision, thus having a good practical value and an excellent application prospect in the field of non-contact laser online measurement and research.

Description

technical field [0001] The invention relates to the field of mechanical design and on-machine measurement, in particular to a laser on-machine measurement device and method for the profile of rotary structural feature parts based on a numerically controlled lathe. Background technique [0002] In the 1990s, the measurement technology based on the three-coordinate measuring machine was called "measurement center" because of its high precision, good performance, strong versatility, and large measurement range; however, as an offline measurement method, three-coordinate The measurement is not only costly and difficult to maintain, but also requires secondary clamping and repositioning, which seriously affects the efficiency of the entire processing and measurement. With the continuous development of science and technology, in the aerospace, automobile, shipbuilding and mold industries, the production mode has gradually evolved from large batches and single varieties to small an...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the on-machine measurement of rotary parts of a CNC lathe is limited by the degree of freedom of the lathe, and then realize the high-efficiency and precise on-machine measurement of the part profile, and lay the foundation for the integration of turning and measurement. For this reason, the present invention provides A laser on-machine measurement device and method for parts with rotary structural features based on a CNC lathe, designing an adjustable and detachable laser sensor fixture, measuring the structural features of the part surface on the machine, compiling data processing algorithms, and performing model reconstruction and errors Analysis, in order to achieve the purpose of efficient and precise measurement of contour features

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