Method for supplementing carbon on machine element surface

A process method and technology for mechanical parts, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of insufficient hardness, scrapped parts, decarburization of workpiece surface, etc., and achieve a good combination effect.

Active Publication Date: 2007-03-14
SINOVEL WIND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Mechanical parts often cause decarburization on the surface of the workpiece due to various reasons. Decarburization will cause insufficient hardness and make the parts face scrapping

Method used

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  • Method for supplementing carbon on machine element surface
  • Method for supplementing carbon on machine element surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 20CrNi 2 MoA steel carburized gear shaft (specification ∮589X2422), after carburizing, the temperature is lowered and directly quenched + high temperature tempering + secondary quenching, after low temperature tempering, due to unqualified hardness, another quenching is performed. It is found that the quality is still unqualified and cannot meet the technical requirements, mainly because the hardness of the tooth surface is low. The technology requires tooth surface hardness HRC57-62, while the measured hardness value is HRC48-55. This batch of gear shafts weighs 5.5 tons and has been quenched twice. If the processing is not good, even if the hardness meets the requirements, the deformation will be out of tolerance and they will have to be scrapped.

[0016] Therefore, to save these gear shafts, only one quenching opportunity is allowed, and if it is unsuccessful, it must be scrapped. How to seize the last chance to deal with success is raised as a key quest...

Embodiment 2

[0022] Example 2 45 # 12 carbon steel guide rollers, specification ∮220X462, quenched and tempered hardness HB260~280, due to improper process arrangement, resulting in surface decarburization, so the hardness after intermediate frequency quenching is too low, the technical requirement hardness is HRC40~45, but the actual measurement can only reach HRC20~30. In view of the production cycle, this batch of guide rollers can only be salvaged and reused, and cannot be scrapped.

[0023] Since the remaining processing allowance is only about 0.1MM, if the surface is quenched with carbon supplement, the deformation will be large, which may lead to scrapping. Therefore, it is necessary to propose a heat treatment process that can not only prevent deformation and overheating, but also achieve the purpose of carbon replenishment, so as to achieve the purpose of saving this batch of parts.

[0024] The carbon supplement process and parameters are:

[0025] a. Carburizing temperature:...

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Abstract

The invention discloses a technique for surface carburization on a mechanic device, which is characterized in including the quality and structure feature of devices that need to be carburized, and the steps of analyzing raw carbon-density distinction of its cross section and designing the carburization technique; shoving, heating, carburizing and supplying carbon on the basis of technological requirements, with technological parameter 780-900 deg., 0.3-1.05CP, 5-20H; quick cooling with a fun or oven based on the technological requirements, after the temperature dropped, quenching and lonnealing and / or power-frequency quenching for one time and checking the ruggedness and / or checking a peeling test with a coupon to said device. The invention is pretty simple, economical, and broad used, available to heavy and large parts with different material qualities and degrees of decarburization, explored a new approach to healings qualities of large equipment.

Description

technical field [0001] The invention relates to the carburizing of ferrous metals using gas, in particular to a process for carburizing (supplementary carburizing) the surface of mechanical parts. Background technique [0002] Mechanical parts often cause decarburization on the surface of the workpiece due to various reasons. Decarburization will cause insufficient hardness and make the parts face scrapping. For small parts, scrapping can still be considered, but for major mechanical parts, remedial measures must be taken to save them. Salvage methods vary by decarburization and processing. For workpieces whose decarburized layer exceeds the machining allowance, carburization can be added in a carburizing atmosphere, which is called surface carburization. Such workpieces can be successfully rescued by using the surface carbon replenishment process. Using the gas carburizing process to replenish carbon on the workpiece and compound heat treatment after carbon replenishment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/22C23F17/00
Inventor 曹邦兴欧阳润之单文强樊永君
Owner SINOVEL WIND GRP
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