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A surface fatigue-resistant treatment process for slewing bearings

A technology of slewing bearing and processing technology, applied in metal material coating technology, coating, solid diffusion coating and other directions, can solve the problems that the surface treatment technology of slewing bearing cannot meet the requirements of use and the use environment is harsh, and achieve dimensional stability. , Improve the service life, improve the effect of surface wear resistance and salt resistance

Active Publication Date: 2019-04-23
安徽省宁国顺昌机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Different industries have put forward their own standards for slewing bearings, such as wind power generation, construction machinery, bearing industry, etc. The slewing bearings in the present invention are used for large-scale machinery in deserts, and the operating environment is even harsher. The bearing surface treatment process cannot meet its use requirements

Method used

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  • A surface fatigue-resistant treatment process for slewing bearings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: The nitriding salt used in the first salt bath nitriding is calculated by mass percentage, and the formula consists of: urea 51.243%, NaCN 1.5%, YCl 3 ·6H 2 O 0.012%, KCNO 18.322%, NaCNO 18.923%, NaCl 10%;

[0037] The oxidation salt used in a salt bath oxidation is calculated by mass percentage, and the formula is composed of: KNO 3 25%, NaNO 3 21%, NaCl 24%, NaNO 2 28%, borax 2%;

[0038] The oxidation salt used in the secondary salt bath oxidation is calculated by mass percentage, and the formula is composed of: KNO 3 24.223%, NaNO 3 27.442%, NaCl 25%, NaNO 2 23.323%, YCl 3 ·6H 2 O 0.012%.

Embodiment 2

[0039] Example 2: The nitriding salt used in the first salt bath nitriding is calculated by mass percentage, and the formula consists of: urea 52.243%, NaCN 1.5%, YCl 3 ·6H 2 O 0.012%, KCNO 14.322%, NaCNO 20.923%, NaCl 11%;

[0040] The oxidation salt used in a salt bath oxidation is calculated by mass percentage, and the formula is composed of: KNO 3 26%, NaNO 3 20%, NaCl 22%, NaNO 2 29%, borax 3%;

[0041] The oxidation salt used in the secondary salt bath oxidation is calculated by mass percentage, and the formula is composed of: KNO 3 22.223%, NaNO 3 29.442%, NaCl 24%, NaNO 2 24.321%, YCl 3 ·6H 2 O 0.014%.

Embodiment 3

[0042]Example 3: The nitriding salt used in the first salt bath nitriding is calculated by mass percentage, and the formula consists of: urea 50.243%, NaCN 1.5%, YCl 3 ·6H 2 O 0.012%, KCNO 16.322%, NaCNO 19.923%, NaCl 12%;

[0043] The oxidation salt used in a salt bath oxidation is calculated by mass percentage, and the formula is composed of: KNO 3 24%, NaNO 3 22%, NaCl 23%, NaNO 2 29%, borax 2%;

[0044] The oxidation salt used in the secondary salt bath oxidation is calculated by mass percentage, and the formula is composed of: KNO 3 23.223%, NaNO 3 28.442%, NaCl 22%, NaNO 2 25.322%, YCl 3 ·6H 2 O 0.013%.

[0045] The steps of the method used in the above embodiments are all the same, and all are carried out according to the following steps in the present invention: 1) cleaning; 2) preheating; 3) salt bath nitriding; 4) cleaning; 5) carburizing treatment 6) two Second preheating; 7) Polishing; 8) First salt bath oxidation 9) Second carburizing treatment 10...

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Abstract

The invention discloses a surface fatigue-resistant treatment process for a rotating bearing. The surface fatigue-resistant treatment process for the rotating bearing includes the first step of cleaning, the second step of primary pre-heating, the third step of primary salt bath nitriding, the fourth step of cleaning, the fifth step of primary carburizing treatment, the sixth step of secondary pre-heating, the seventh step of polishing, the eighth step of primary salt bath oxidizing, the ninth step of secondary carburizing treatment, the tenth step of secondary salt bath oxidizing and the eleventh step of rinsing. In the treatment process, salt bath nitriding is performed firstly, then crossed carburizing and salt bath oxidizing treatment is performed, the microhardness of the surface of a rotating bearing cladding layer is highest, the cladding layer is uniform in thickness, uniform in distribution, compact and complete, the combining capacity of the cladding layer and a base material is high, the salt corrosion resistance and the stress corrosion breakage resistance can be further improved, by using the rotating bearing treated through the process, the rotating bearing is stable in size and small in high temperature deformation, the surface hardness reaches HV2500 or above, the dry friction coefficient is reduced to 0.08-0.1, the abrasion resistance is improved by 450%, the fatigue service of the rotating bearing is 10-12 times that of conventional heat treatment, and the comprehensive performance meets the using requirement of an extremely severe environment.

Description

technical field [0001] The invention relates to the field of slewing bearing surface treatment, in particular to a slewing bearing surface fatigue resistance treatment process. Background technique [0002] The slewing bearing industry has experienced more than 30 years of development in my country. Since the first release of the JB2300-84 "Slewing Bearing Form, Basic Parameters and Technical Requirements" standard in 1984, and the JB / T2300-1999 "Slewing Bearing" revised in 1999 Standard, now our country already has the comprehensive development capability of perfect slewing ring design, manufacture and test. at the same time not [0003] Different industries have proposed their own standards for slewing bearings, such as wind power generation, construction machinery, bearing industries, etc. The slewing bearings in the present invention are used for large-scale machinery in deserts, and the operating environment is even harsher. The bearing surface treatment process cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C12/00
CPCC23C12/00
Inventor 李海波姚燕超喻鹏
Owner 安徽省宁国顺昌机械有限公司
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