Large gear measurement method based on articulated arm measurement machine

Abstract

The invention provides a large gear measurement method based on an articulated arm measurement machine, belonging to the technical field of gear measurement. An articulated arm coordinate measurement machine is arranged beside a machine tool to perform field measurement on a machined gear on the machine tool; through the articulated arm coordinate measurement machine, a position relationship between a measured gear workpiece and a measurement instrument can be established; after a probe of the measurement instrument is adopted to uniformly sample on the gear surface, a gear surface initial angle parameter corresponding to each measurement point of the actual gear surface is obtained, and the gear surface gear shape error is obtained through calculation. As a revolving platform of the machine tool is adopted to drive the gear workpiece to perform revolving or as the position of the articulated arm coordinate measurement machine is moved, the measurement of gears in different positions of the large gear can be realized.

Description

technical field [0001] The invention relates to a method for measuring large gears based on an articulated arm measuring coordinate machine. The method is simple and efficient, and is particularly suitable for on-machine measurement of large gears. It belongs to the field of precision testing technology and precision instruments. Background technique [0002] Large gears refer to gears with a diameter greater than 500mm, which are key components of large equipment. For large gears, due to the large parameters, size and weight, analytical measurement based on tooth profile, helix and tooth pitch measurement is mainly based on the electronic generation method. [0003] Electronic generation measurement refers to the formation of a specific trajectory curve (helix, tooth profile, etc.) ), the trajectory curve is compared with the actual characteristic line of the measured gear to determine the corresponding error. [0004] The instruments for measuring based on the electroni...

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Problems solved by technology

[0006] Using the traditional electronic generation method to measure large gears has the following disadvantages: 1) The specific trajectory formed by the generation system must be strictly controlled within the set measurement surface (end plane or indexing cylindrical surface), so the aiming and positioning of the measuring instrument High precision requirements

However, the size of the large gear is large, and the structure and volume of the measuring instrument increase accordingly, which brings great difficulties to the manufacture and assembly of the instrument; 2) Using a rotating platform to measure the large gear, the weight of the gear adds a lot of force to the rotating shaft, resulting in the geometry of the instrument. Deformation; and the gear inertia is large, the rotation and stop are difficult to control accurately, and the measurement error caused by the small angle deviation will increase with the increase of the measured gear size, that is, there is a so-called "error amplification" effect

3) Large-scale measuring instruments are not suitable for placement on the production site and are generally installed in the measurement room. Therefore, the large gear needs to be transported to the measurement room for testing after processing, and then transported back to the production site for correction after testing. The process is quite cumbersome and complicated

In addition, large-scale instruments are expensive, and ordinary enterprises cannot afford them, which affects the application of such instruments

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