A method of laser detecting screw rotor end truncation

Abstract

The invention discloses a method for laser detection of a screw rotor end sectional shape, and relates to detection of screw rotors. The measurement advantages of high precision, non-contact type and long service life of a laser displacement sensor are utilized, and the laser displacement sensor moves along the rotor theoretical end sectional shape to keep equidistance measurement. A kinematic relation between a screw rotor rotating coordinate system and a coordinate system where a movable platform of the laser displacement sensor is located is established, a normal vector of each data point of the rotor end sectional shape is calculated, by the rotation of the screw rotors, the interference phenomenon that a measured point is sheltered by other contours in the measurement process is avoided, and the problem that the included angle between the normal vector of the measured point and the laser emergent direction exceeds the angle range, which can be accurately measured, of the laser displacement sensor is solved. The detection accuracy can be effectively improved, the high-precision detection of the screw rotor end sectional shape is obtained, and the method is also applied to measurement of end sectional shapes of the screw rotors with wide helicoids.

Description

technical field [0001] The invention relates to the detection of a screw rotor, in particular to a method for detecting the end section of a screw rotor with a laser. Background technique [0002] The profile line of the end surface of the screw rotor is the main characteristic line of the screw rotor and the basis of screw manufacturing. Therefore, the measurement of the profile line of the end surface of the screw rotor is the key to the quality control of the screw product. With the development of the screw and its research, the composition of the section profile of the rotor end is becoming more and more complex, and it is becoming more and more difficult to measure the profile under the condition of ensuring accuracy. One of the detection methods for rotor profiles is mechanical profiling ([1] Zhang Zhenghua. Research on screw rotor profile detection technology [D]. Jiangnan University. June 2008), the key to the measurement depends on the manufacture of standard screw ...

AI Technical Summary

Problems solved by technology

However, the detection software matching the CMM equipment is complex to operate and requires high operational skills of the staff; the probe is easy to wear during use, resulting in reduced measurement accuracy and low life, and the change in the measurement motion acceleration for large curvature lines greatly affects the measurement accuracy. , Therefore, the detection accuracy also needs to be improved

Non-contact measurement because the mechanical motion is three linear axes, the motion calculation is complex, the efficiency is low, and the measurement accuracy is difficult to meet the product requirements. Taking TDV-900 as an example, its measurement accuracy is 0.02mm ~ 0.05mm, and the screw rotor belongs to precision manufacturing. Products, its accuracy requires that the upper and lower deviations do not exceed 0.01mm, so at present enterprises generally use contact measuring equipment

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