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Method for estimating local fatigue strength of gears according to residual stress distribution at gear roots

A technology of residual stress and fatigue strength, which is applied in the field of gear design and manufacturing, and can solve problems such as the inability to quantitatively design the shot peening process

Pending Publication Date: 2018-08-10
昌宇应力技术(上海)有限公司
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Problems solved by technology

[0003] The primary purpose of the present invention is to solve the above-mentioned technical defects, especially the technical defect that the reasonable shot peening process cannot be quantitatively designed to effectively improve the bending fatigue strength of the product, and to provide a method for quantitatively estimating the local fatigue of the gear according to the residual stress distribution of the tooth root. method of strength

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  • Method for estimating local fatigue strength of gears according to residual stress distribution at gear roots
  • Method for estimating local fatigue strength of gears according to residual stress distribution at gear roots
  • Method for estimating local fatigue strength of gears according to residual stress distribution at gear roots

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[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0026] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be unders...

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Abstract

The invention provides a method for estimating local fatigue strength of gears according to residual stress distribution at gear roots. The method comprises the following steps of: testing residual stress distribution and bending fatigue strength of a gear under at least three shot blasting process states; obtaining a quantitative relationship coefficient between a residual stress value and bending fatigue strength according to the test result and a Goodman relationship; and designing reasonable local fatigue strength of the gear according to the quantitative relationship coefficient, and back-stepping required residual stress distribution and a reasonable shot blasting process for realizing the distribution, or predicting a bending fatigue failure mode of existing gear products so as to formulate reasonable prevention measures and improve the shot blasting strengthening process. According to the method, quantitative association between residual stress distribution at roots of gears and local bending fatigue strength is established, and a concept of local fatigue strength is innovatively put forward, so that residue stress can quantitatively enter the design stage of the gear products through being taken as mechanical parameters, and the reasonable shot blasting strengthening process is back-stepped. Meanwhile, bending fatigue failure forms of existing gears are analyzed and pre-judged, so that directions are provided for failure prevention and the shot blasting process.

Description

technical field [0001] The invention belongs to the technical field of gear design and manufacture, in particular, the invention relates to a method for quantitatively estimating the local fatigue strength of a gear according to the distribution of tooth root residual stress. Background technique [0002] Bending fatigue damage is one of the main failure modes of gears, which is extremely harmful. In order to improve the bending fatigue limit and service life of gears, the surface shot peening of carburized and quenched gears is a very effective technical approach. The reason why shot peening can improve the bending fatigue strength of gears is that the formed residual compressive stress plays a key role. At present, the understanding and application of residual stress by domestic gear enterprises is still at the primary level. Most of the products have not undergone shot peening treatment. Although a small number of high-end or export products have undergone shot peening, ...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06
Inventor 白涛潘海滨武立宏
Owner 昌宇应力技术(上海)有限公司
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