On-machine measuring method for wall thickness of complex thin-wall structure part

Abstract

The invention discloses an on-machine measuring method for a wall thickness of a complex thin-wall structure part; after a numerical control milling machine is roughly processed and installed on the complex thin-wall structure part on a rotary table, a contact probe is called and installed to a main shaft of a machine tool, and a plurality of planning points are arranged on the curve surface of the tested area of the complex thin-wall structure part; the actual measurement value of coordinates of the planning points is detected by the contact probe; and then the actual normal vector of each planning point on the curve surface of the tested aera of the complex thin-wall structure part is drawn by the actual measurement value of the coordinate. A transfer device provided with a ultrasonic sensor is continuously replaced and called to the maine shaft of the machine tool; through the posture control of the main shaft of the machine tool and the rotary table, an ultrasonic thickness gauge can calculate the wall thickness value of the tested point automatically when the ultrasonic sensor touches the curve surface planning point of the complex thin wall structure part; and the wall thickness value is transmitted to a computer through a signal cable in real time; and then the computer processes, analyzes, and stores the wall thickness measuring data of all planning points of the complex thin wall structure part.

Description

technical field [0001] The invention belongs to the field of electronic detection equipment, and in particular relates to an on-machine measurement method for the wall thickness of complex thin-walled structural parts, which can be used for on-machine measurement of the wall thickness of complex curved surface thin-wall by multi-axis linkage numerical control machine tools. Background technique [0002] Thin-walled parts are a kind of typical structural parts in modern aviation manufacturing industry, which have the characteristics of large size, low stiffness and complex surface structure. Such parts are usually manufactured by near-net shape and milling methods, and require high wall thickness accuracy. Before processing, it is necessary to accurately measure the wall thickness of thin-walled parts, and modify the processing parameters in real time according to the detection results to achieve precise control of wall thickness accuracy. Hand-held ultrasonic thickness gaug...

AI Technical Summary

Problems solved by technology

However, there are great uncertainties in the measurement position, and it is difficult to obtain accurate measurement data. Especially for complex curved parts, it is difficult to accurately control the direction of the normal vector, which affects the measurement accuracy and may cause the processing of the parts to be scrapped; in addition, hand-held measurement Time-consuming and labor-intensive, greatly affecting measurement efficiency

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