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Simple method for deformation control during carburizing and quenching of large-diameter heavy-duty gears

A technology of carburizing and quenching and deformation control, which is applied in the direction of manufacturing tools, coatings, furnace types, etc., can solve the problems of large amount of deformation and high scrap rate during carburizing and quenching, and achieve high precision of deformation control, simple operation and low equipment cost Effect

Inactive Publication Date: 2011-04-13
CRRC QISHUYAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of large amount of carburizing and quenching deformation of existing workpieces and high rejection rate, the present invention provides a simple method for controlling carburizing and quenching deformation of large-diameter heavy-duty gears

Method used

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  • Simple method for deformation control during carburizing and quenching of large-diameter heavy-duty gears
  • Simple method for deformation control during carburizing and quenching of large-diameter heavy-duty gears

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Experimental program
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Effect test

Embodiment

[0032] Steel parts made of 20CrMnTi

[0033] Part name: gear a, b

[0034] Material: 20CrMnTi

[0035] Technical requirements: carburized layer depth ≥ 1.5mm

[0036] Tooth surface hardness HRC55-60

[0037] Hardness in quenching depth: 550HV1

[0038] Main dimensions of gears (Table 1)

[0039] Table 1 Main dimensions of gears

[0040]

workpiece

modulus

(m)

Pitch circle

diameter

d(mm)

Addendum circle

diameter

da(mm)

Web thickness

Degree c(m)

tooth width

b(mm)

dh(mm)

gear a

6

φ370

φ384

20

66

φ90

[0041] gear b

6

φ354

φ366

20

60

φ90

[0042] The following process measures are adopted: normalizing the gear forging blank (940-950℃×2.5h) → carburizing the workpiece in direction A (920℃×8-9h) → normalizing in direction B (880℃×1.5h- 2h)→static oil quenching ...

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Abstract

The invention relates to the technical field of carburizing and quenching as well as deformation control of steel work-pieces, and particularly relates to a simple method for deformation control during the carburizing and quenching of large-diameter heavy-duty gears. In the method, the deformation control can be carried out on the carburizing and quenching of the steel work-pieces by adopting simple facilities under simple operation conditions, so as to reach the expected effect and improve the product quality. The method comprises the following steps of: normalizing of steel work-piece, carburization of the steel work-pieces placed in a direction A, normalization of the steel work-pieces placed in a direction B, quenching of the steel work-pieces placed in the direction B in a static oil, and tempering. The method has the significances of breaking through the situation that the deformation control of the carburizing and quenching of the large-diameter complicated heavy-duty face gears can be controlled only by adopting complicated facilities and complicated technological operations, and simultaneously developing a simple and practical way for the deformation control during the carburizing and quenching of the large-diameter complicated heavy-duty face gears.

Description

technical field [0001] The invention relates to the technical field of carburizing and quenching and deformation control of iron and steel workpieces, in particular to a simple method for carburizing and quenching deformation control of large-diameter heavy-duty gears. Background technique [0002] The high speed and heavy load of high-power gears, especially the batch production of large-diameter web structure carburizing and quenching, put forward higher requirements for manufacturing accuracy. Generally, to control deformation, methods such as quenching press, hot oil quenching or isothermal quenching are often used. However, configuring a quenching press requires a certain amount of equipment cost and equipment production cycle, and due to structural limitations and limited versatility, it is difficult to apply to products of various sizes and structures; hot oil quenching or austempering also has certain equipment. Requirements and corresponding process operation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32C23C8/22C21D1/18
Inventor 潘晓松
Owner CRRC QISHUYAN CO LTD
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