A Method of Improving the Precision of Plane Enveloping Toroidal Worm Tooth Surface

Abstract

The invention relates to a method for improving the tooth surface accuracy of a planar enveloping hourglass worm. The method comprises the steps that the center distance, the generating plane inclination angle, the worm axial relative position and the main base circle radius serve as technological parameters to be together input into a numerical control system for machining of the worm; after machining is completed, matching of a theoretical coordinate system and a measuring coordinate system is achieved on a measuring instrument, then after probe radius compensation is conducted, off-line measuring is conducted according to a theoretical path, and errors of all points on a worm indexing helical line and errors of all points on a tooth profile of the throat part of a symmetric axis sectionare obtained; whether the errors of the worm indexing helical line and the errors of the tooth profile of the throat part of the symmetric axis section meet the design requirement or not is judged, if the design requirement is not met, the correction quantity is calculated, and after the technological parameters are corrected, remachining and detecting are conducted; and if the design requirementis still not met, the correction quantity is re-calculated according to the new detecting result, the technological parameters are corrected, and machining is conducted until the accuracy meets the requirement. According to the method for improving the tooth surface accuracy of the planar enveloping hourglass worm, the errors of the worm indexing helical line and the tooth profile of the throat part of the symmetric axis section are only needed to be detected, detected data are less, and the efficiency is high.

Description

[Technical Field] [0001] The invention relates to the detection and manufacture of a plane-enveloping toroidal worm, in particular to a technology for detecting and correcting the tooth surface error of the toroidal worm. [Background technique] [0002] Toroidal worm drive is an important form of transmission, which is widely used in the field of power transmission. The double-line contact at the entrance, the large angle between the instantaneous contact line and the direction of the relative motion speed, and the large number of surrounding teeth determine its advantages such as strong load-bearing capacity and high transmission efficiency. At the same time, it also puts forward higher requirements for processing accuracy. [0003] Affected by geometric error, force deformation error, thermal deformation error, grinding wheel wear and other factors, there will be errors in the tooth surface of the plane envelope toroidal worm after grinding. The geometric error of the processing...

AI Technical Summary

Problems solved by technology

However, it is not easy to measure and compensate for errors caused by factors such as force deformation error, thermal deformation error, and grinding wheel wear.

[0004] Patent CN104148745A proposes an on-line detection and correction processing method for the tooth surface of the toroidal worm. Although the processing accuracy is improved to a certain extent, the on-line monitoring relies heavily on the original accuracy of the machine tool, and the original accuracy will directly and seriously affect the on-line measurement of the worm. the accuracy of

If the geometric accuracy of the machine tool does not meet the requirements, or deformation occurs after being subjected to force and heat, the measurement results will be distorted, resulting in misjudgment

Moreover, this method needs to measure a series of torus helical error values ​​from the addendum circle to the dedendum circle to perform error analysis, which will lead to a large amount of measured data

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