A salt-resistant treatment process for the surface of a slewing bearing

A technology of slewing bearing and processing technology, applied in the direction of metal material coating technology, solid diffusion coating, coating, etc., can solve the problems that the surface treatment technology of slewing bearing cannot meet the needs of use and the use environment is harsh, and achieve performance improvement. , Excellent resistance to salt corrosion and improved microhardness

Active Publication Date: 2019-03-15
安徽省宁国顺昌机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: The nitriding salt used in the first salt bath nitriding is calculated by mass percentage, and the formula consists of: urea 51.122%, NaCN 1.2%, YCl 3 ·6H 2 O 0.012%, KCNO 20%, NaCNO 19.423%, NaCl 8.243%;

[0035] 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 25%, NaNO 2 27%, borax 2%;

[0036] 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 30%, NaCl 21.442%, NaNO 2 25.322%, YCl 3 ·6H 2 O 0.013%

Embodiment 2

[0037] Example 2: The nitriding salt used in the first salt bath nitriding is calculated by mass percentage, and the formula consists of: urea 50.322%, NaCN 1%, YCl 3 ·6H 2 O 0.012%, KCNO 21%, NaCNO 18.423%, NaCl 9.243%.

[0038] 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%.

[0039] 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 29%, NaCl 22.442%, NaNO 2 24.323%, YCl 3 ·6H 2 O 0.012%.

Embodiment 3

[0040] Example 3: The nitriding salt used in the first salt bath nitriding is calculated by mass percentage, and the formula consists of: urea 49.222%, NaCN 1.1%, YCl 3 ·6H 2 O 0.012%, KCNO 22%, NaCNO 17.423%, NaCl 10.243%;

[0041] The oxidation salt used in the primary salt bath oxidation is calculated by mass percentage, and the formula composition is: KNO3 24%, NaNO3 22%, NaCl 23%, NaNO2 28%, borax 3%;

[0042] The oxidation salt used in the secondary salt bath oxidation is calculated by mass percentage, and the formula is composed of: KNO 3 22.225%, NaNO 3 28%, NaCl 24.442%, NaNO 2 25.323%, YCl 3 ·6H 2 O 0.010%.

[0043] 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 once; 3) salt bath nitriding once; 4) cleaning; 5) carburizing treatment once; Second preheating; 7) Polishing; 8) First salt bath oxidation 9) Second carburizing trea...

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PUM

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Abstract

The invention discloses a surface salt resistant treatment process for a rotary bearing. The surface salt resistant treatment process for the rotary 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 obviously improved, 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 nitriding salt, carburizing media and oxidizing salt prepared in the process, the treated rotating bearing is more excellent in salt corrosion resistance and good in high temperature mechanical performance, and the comprehensive performance meets the using requirement of an extremely severe environment.

Description

technical field [0001] The invention relates to the field of surface treatment of slewing bearings, in particular to a salt-resistant treatment process for the surface of slewing bearings. 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 pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/50C23C8/22C23C8/42C23C8/02
CPCC23C8/02C23C8/22C23C8/42C23C8/50
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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