Method for measuring tooth profile deviation of cylindrical gear based on linear structured light

Abstract

The invention discloses a method for measuring the tooth profile deviation of a cylindrical gear based on linear structured light. According to the method, firstly a three-dimensional nominal mathematical model of the tooth surface of a measured gear is built; the structured light is formed by a series of equally spaced light spots, and the operation is performed based on characteristics of the structured light and within an effective value range of the structured light; a mathematical model of a gear tooth profile deviation item is built; and finally high-precision measurement for the tooth profile total deviation, the tooth profile slope deviation and the tooth profile shape deviation of the cylindrical gear is realized. According to the invention, detection for each tooth of the cylindrical gear in a complex environment can be realized, the measurement speed is high, and the efficiency is high; the method can adapt to detection for various types of cylindrical gears and does not have problems such as measuring head abrasion and radius compensation; the measurement accuracy can be improved through big data, the repeatability is good, and a shadow effect in gear detection is avoided. Tooth profile error calculation can be performed on all measured data transformed into a gear coordinate system, and the method is high in calculation speed.

Description

technical field [0001] The invention relates to a method for measuring the tooth profile deviation of a cylindrical gear based on line structured light, and belongs to the technical fields of precision testing technology, instrument and gear detection. Background technique [0002] Tooth profile deviation is the amount by which the actual tooth profile deviates from the nominal tooth profile, and is one of the most important indicators of the smoothness of gear transmission. At present, the main methods of tooth profile deviation measurement are: generation method, coordinate method, projection method and meshing method, but these four methods have their own trade-offs in terms of measurement efficiency, measurement gear type, and economic cost. Taking cylindrical gears as an example, a measurement method with fast speed, high efficiency, accurate measurement and the ability to measure gears with different parameters will be a revolution in the field of gear detection techno...

AI Technical Summary

Problems solved by technology

[0004] When measuring cylindrical gears with online structured light, there are three difficulties that hinder the popularization and application of non-contact gear measurement: First, the characteristics of structured light itself limit the measurement and cannot be directly measured in the radial direction.

Structured light is composed of a series of light spots with equal spacing. If the structured light is directly projected radially to measure the gear, the tooth profile data will be unreliable.

Second, due to the influence of the surface topography of each wheel of the gear, there will be shadow effects that make it impossible to collect tooth profile data

Third, the gear data measured by structured light is a parameter of a certain tooth profile relative to the spatial position of the probe, and this measurement parameter cannot be directly measured for the error term

The traditional evaluation method has promoted the progress of tooth profile measurement technology to a certain extent, but for the gear detection effect, the traditional evaluation interval method limits the measurement speed

Images