Method for preventing circularity over tolerance of large gear ring after heat treatment

A ring gear and large-scale technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as increased procedures, construction period, energy consumption and labor intensity, complex processing procedures of large ring gears, excessive deformation of parts, etc. Achieve the effects of avoiding waste products, shortening the manufacturing cycle, and simple operation

Inactive Publication Date: 2011-04-20
DALIAN HUARUI HEAVY IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of too many factors in heat treatment, especially the existence of some accidental factors, there will still be a small number of parts whose deformation exceeds the machining allowance; and this type of large ring gear has complicated processing procedures, and if it is scrapped, it will cause huge economic losses , so it is necessary to correct
[0004] In the literature search of the existing technical documents, it is found that most of the heat treatment correction processes of this type of large ring gear currently use the flame hot spot method and the tooling setting method to correct the elliptical deformation of the large ring gear, but these two methods require additional processes, The construction period, energy consumption and labor intensity are not only too complicated but also long cycle and high cost for batch heat treatment parts

Method used

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  • Method for preventing circularity over tolerance of large gear ring after heat treatment
  • Method for preventing circularity over tolerance of large gear ring after heat treatment
  • Method for preventing circularity over tolerance of large gear ring after heat treatment

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings. Such as Figure 1-3 As shown, a method to prevent the roundness of the large ring gear from being out of tolerance after heat treatment includes the following steps:

[0028] A. Pre-select the easily deformable large ring gear 1;

[0029] B. Perform quenching and tempering treatment on the large ring gear 1, that is, quenching + high temperature tempering, and control the final cooling temperature between the Ms point and the Mz point of the material after quenching;

[0030] C. Deformation measurement of the large ring gear 1;

[0031] D. Put the large ring gear 1 with elliptical deformation at 1 / 4 of the height of the large ring gear 1 in the short axis direction of the large ring gear 1 with a jack 2 until the large ring gear 1 with elliptical deformation reaches the required size;

[0032] E. Place the pre-prepared jacking shaft 3 at 3 / 4 of the height of the large...

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Abstract

The invention discloses a method for preventing roundness deviation of a large gear ring after heat treatment. The method comprises the following steps: jacking the ellipsoidal deformed gear ring generated after heat treatment quenching at 1 / 4 height of the large gear ring at a direction of the minor axis of the large gear ring by a lifting jack until the ellipsoidal deformed gear ring is jacked to the required size; jacking a jacking shaft previously prepared at the 3 / 4 height of the large gear ring near the direction of the minor axis jacked by the lifting jack; removing the lifting jack; carrying out a normal tempering treatment on the large gear ring with the jacking shaft in a furnace; and cooling down the gear ring after tempering to room temperature, removing the jacking shaft to end the deformation correction. In the invention, only the steps for measuring deformation and installing the jacking shaft are added in the original heat treatment process flow, and the success rate for correction can be up to 100%. The two steps both have no influence on the original heat treatment process; therefore, the invention realizes the purposes of no extra addition of working procedure, working period, energy consumption and labor intensity, thereby avoiding the occurrence of waste products and lowering the manufacturing cost of products.

Description

technical field [0001] The invention relates to a metal material heat treatment technology, in particular to a method for preventing the roundness of a large ring gear from being out of tolerance after heat treatment. Background technique [0002] Quenching and tempering treatment in the parts heat treatment process usually refers to heating the steel parts to a temperature above the austenitization temperature Ac3 or Ac1 point, keeping it for a certain period of time, and then cooling at the critical cooling rate to obtain a martensite structure, Then carry out the heat treatment process of high temperature tempering. Due to the inhomogeneity of the temperature and structural changes of the parts interface during heating and cooling, as well as the gravity and clamping force of the parts, under the action of internal stress and external force, the parts will be more or less distorted after heat treatment. There are often two types of deformation in ring quenching and tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/32C21D11/00C21D1/25
Inventor 王建华段惠刚孙亚芝王永君孙斌韩华杨磊张家亮
Owner DALIAN HUARUI HEAVY IND GRP CO LTD
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