CN106636570A - Heat treatment method for repairing of carburization pin bush - Google Patents
Heat treatment method for repairing of carburization pin bush Download PDFInfo
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- CN106636570A CN106636570A CN201611152408.6A CN201611152408A CN106636570A CN 106636570 A CN106636570 A CN 106636570A CN 201611152408 A CN201611152408 A CN 201611152408A CN 106636570 A CN106636570 A CN 106636570A
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- carburizing
- guide
- heat treatment
- treatment method
- reprocessed
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method for repairing of a carburization pin bush and relates to the technical field of repairing technologies. The heat treatment method for repairing of the carburization pin bush comprises the following steps that firstly, the hollow carburization pin bush is quenched; secondly, the carburization pin bush obtained in the first step is subjected to secondary carburization, and the inner surface of the carburization pin bush is cooled in the secondary quenching process; and thirdly, the carburization pin bush obtained in the second step is subjected to low-temperature tempering treatment. According to the heat treatment method for repairing of the carburization pin bush, a scrapped workpiece is subjected to repairing of the heat treatment technological method so that the requirement for strength and toughness can be met again, reutilization of the scrapped carburization pin bush is achieved, and the production cost is saved.
Description
Technical field
The present invention relates to Rework Technics technical field, more particularly to the heat treatment method that a kind of carburizing guide is reprocessed.
Background technology
Crawler belt carburizing guide is the key components and parts in engineering machinery track bottom diskware, requires to ooze during use
Carbon guide tool high anti-wear performance and high impact flexibility etc..Carburizing guide is typically prepared using 20CrMnTi low carbon carburizing steels
Form.The surfaces externally and internally hardness of carburizing guide reaches HRC58-63, and centre hardness reaches HRC30-45, and surface carbon concentration reaches
0.7-0.9% could meet the Eligibility requirements of carburizing guide.Prepare carburizing guide is typically carried out using gas carbruizing furance to guide
Carburizing, by induction diathermic technique carries out heating quenching to guide and tempering obtains carburizing guide after slow cooling.In carburizing process
In due to carburizing control it is bad, it sometimes appear that carburizing guide carburized layer infiltration phenomenon, carburizing guide be unsatisfactory for require, cause
The carburizing guide of infiltration carries out scrapping process.
Because guide carburizing is a kind of long the production cycle, low production efficiency, the big Technology for Heating Processing of energy consumption.Carburizing guide Jing
Directly scrapping after Overheating Treatment technique causes manufacturing cost to increase.That therefore develops a kind of carburizing guide reprocesses heat treatment method solution
Certainly carburizing guide permeates and directly scraps what the problem for causing manufacturing cost increase was a need for.
The content of the invention
It is an object of the invention to propose a kind of carburizing guide reprocesses heat treatment method, solve the infiltration of carburizing guide and
Carburizing guide is caused to be scrapped, the problem that production cost increases.
It is that, up to this purpose, the present invention is employed the following technical solutions：
The heat treatment method that a kind of carburizing guide is reprocessed, comprises the following steps：
Step one：Hollow carburizing guide is carried out into Quenching Treatment so that carburizing guide realizes through-hardening.
Step 2：The carburizing guide obtained in step one is carried out into secondary quenching process, in secondary quenching process
During cooling treatment is carried out to the inner surface of the carburizing guide so that the outer surface of the carburizing guide obtained in step one is again
Underhardening, the inner surface of carburizing guide has carried out cooling treatment and has kept original hardness, and center portion is added due to carburizing guide periphery
Heat affecting when hot is acted on and causes center portion that high tempering is carried out from cooling down in time, realizes centre hardness reduction, and toughness is carried
Height, so as to obtain surfaces externally and internally hardness height, the carburizing guide of good core toughness.
Step 3：The carburizing guide obtained in step 2 is carried out into lonneal process；What is obtained in removal step two oozes
Stress inside carbon guide.
The heat treatment method reprocessed by carburizing guide, makes the workpiece scrapped carry out reprocessing again for heat-treatment technology method
The requirement of intensity, toughness is reached, has been realized and is scrapped reusing for carburizing guide, saved production cost.
A kind of preferred version of the heat treatment method reprocessed as above-mentioned carburizing guide, described in step 2 at secondary quenching
Reason is that the periphery of the carburizing guide to obtaining in step one carries out impewdance matching process, in the process of impewdance matching process
In, Liquid injection cooling is carried out to the inner surface of the carburizing guide.Firing rate is processed soon using impewdance matching, the thermal efficiency is high, only
Periphery heating carburizing guide deformation to carburizing guide is little.
A kind of preferred version of the heat treatment method reprocessed as above-mentioned carburizing guide, impewdance matching described in step 2
Holding temperature scope is 840-900 DEG C, and heating frequency is 10 ± 0.5KHZ, the tissue of the carburizing guide for obtaining than more uniform, if
Beyond 900 DEG C, the tissue of carburizing guide periphery is thicker, and the carburizing guide obtained less than 840 DEG C of Quenching Treatments does not reach requirement
Hardness and metallographic structure.
A kind of preferred version of the heat treatment method reprocessed as above-mentioned carburizing guide, the cooling of Liquid injection cooling in step 2
Medium is water-based hardening liquid, and inner surface Liquid injection cooling is carried out to carburizing guide using the water-based hardening liquid.
A kind of preferred version of the heat treatment method reprocessed as above-mentioned carburizing guide, Quenching Treatment is described in step one
Induction diathermic Quenching Treatment is carried out to the hollow carburizing guide, makes carburizing guide realize through-hardening.
A kind of preferred version of the heat treatment method reprocessed as above-mentioned carburizing guide, Quenching Treatment described in step one
The scope of holding temperature is 840-900 DEG C, obtains the tissue of carburizing guide than more uniform, if exceeding 900 DEG C, the group of carburizing guide
Knit thicker, the carburizing guide obtained less than 840 DEG C does not reach hardness and the metallographic structure of requirement.
A kind of preferred version of the heat treatment method reprocessed as above-mentioned carburizing guide, the cooling of Quenching Treatment in step one
Medium is water-based hardening liquid, and carburizing guide is cooled down using the water-based hardening liquid.Realize that carburizing guide quenching cross section is complete
Harden in portion.
A kind of preferred version of the heat treatment method reprocessed as above-mentioned carburizing guide, lonneal described in step 3
Tempering range is 150-240 DEG C, and tempering insulation time is not less than 150min, eliminates stress.
Beneficial effects of the present invention：
The heat treatment method that carburizing guide proposed by the present invention is reprocessed, makes the workpiece scrapped carry out heat-treatment technology method
Reprocess and reached again intensity, toughness reguirements, realize reusing for carburizing guide, reduce production cost.
Description of the drawings
Fig. 1 is the flattening test figure after the carburizing guide Repair that the specific embodiment of the invention is provided；
Fig. 2 is the flattening test figure of the normal carburizing guide of comparative example of the present invention 1.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.
" center portion " in embodiment of the present invention is arranged between carburizing guide inner surface and outer surface.
Embodiment of the present invention protects the heat treatment method that a kind of carburizing guide is reprocessed, and comprises the following steps：
Step one：Hollow carburizing guide is carried out into Quenching Treatment so that carburizing guide realizes through-hardening.
Step 2：The carburizing guide obtained in step one is carried out into secondary quenching process, in the process of secondary quenching process
In cooling treatment is carried out to the inner surface of carburizing guide so that the outer surface of the carburizing guide obtained in step one underhardening again,
The inner surface of carburizing guide has carried out cooling treatment and has kept original hardness, and center portion is due to heat when carburizing guide periphery is heated
Influence prevents center portion that high tempering is carried out from cooling down in time, realizes centre hardness reduction, and toughness is improved, so as to
High, the carburizing guide of good core toughness to surfaces externally and internally hardness.
Step 3：The carburizing guide obtained in step 2 is carried out into lonneal process；What is obtained in removal step two oozes
Stress inside carbon guide.
The heat treatment method reprocessed by carburizing guide, makes the workpiece scrapped carry out reprocessing again for heat-treatment technology method
The requirement of intensity, toughness is reached, has been realized and is scrapped reusing for carburizing guide, saved production cost.
Secondary quenching is processed as the periphery of the carburizing guide to obtaining in step one and carries out impewdance matching process in step 2,
During impewdance matching process, Liquid injection cooling is carried out to the inner surface of carburizing guide.Using impewdance matching process heating speed
Degree is fast, and the thermal efficiency is high, and only the periphery heating carburizing guide deformation to carburizing guide is little.
The holding temperature scope of impewdance matching is 840-900 DEG C in step 2, and heating frequency is 10 ± 0.5KHZ, and hydrojet is cold
But cooling medium is water-based hardening liquid, and the carburizing guide after secondary quenching process is carried out at cooling using water-based hardening liquid to it
Reason, than more uniform, if exceeding 900 DEG C, the tissue of carburizing guide periphery is thicker, less than 840 DEG C for the carburizing guide tissue for obtaining
The carburizing guide that Quenching Treatment is obtained does not reach hardness and the metallographic structure of requirement.Preferably, wherein heating-up temperature can be selected
840 DEG C, 860 DEG C, 880 DEG C etc..
Quenching Treatment is to carry out induction diathermic Quenching Treatment to hollow carburizing guide in step one, and carburizing guide is carried out
Whole Quenching Treatment, the scope of holding temperature is 840-900 DEG C, makes whole carburizing guide realize through-hardening, and what is obtained oozes
Than more uniform, if exceeding 900 DEG C, the tissue of carburizing guide is thicker, the carburizing guide obtained less than 840 DEG C for the tissue of carbon guide
Hardness and the metallographic structure of requirement are not reached.The cooling medium of Quenching Treatment is water-based hardening liquid in step one, is quenched using water base
Fiery liquid is cooled down to carburizing guide, realizes carburizing guide quenching cross section through-hardening.
The tempering range of lonneal is 150-240 DEG C in step 3, and tempering insulation time is not less than 150min, disappears
De-stress.Preferably, temperature can select 150 DEG C, 170 DEG C, 190 DEG C, 210 DEG C etc., and temperature retention time can be selected
150min, 170min etc..In present embodiment, temperature retention time selects 150min, if temperature retention time is not reached less than 150min
Eliminate the effect of carburizing guide internal stress.
The carburizing set reprocessed by more than, Jing tests draw the part by outer surface inner surface in the section of carburizing guide
Hardness is 61,60,57.5,53,40,31,34,38,43,48.5,51,55,60,61, outward, internal layer surface hardness be HRC59-
61, centre hardness is HRC31-33, and casehardening layer depth is 3.0mm, and internal layer hardened-depth is 2.8mm, meets carburizing guide
Heat treatment indices are required.If Fig. 1 is the carburizing guide flattening test figure reprocessed, breakpoint power is 82.79KN, and breakpoint displacement is
1.84mm。
Comparative example 1
Fig. 2 is normal carburizing guide flattening test figure, and its point of interruption power 79.48KN, breakpoint displacement is 2.039mm.
Carburizing guide and the contrast of normal carburizing guide, the carburizing guide reprocessed and normal carburizing guide breakpoint that Jing is reprocessed
Power difference less, has reached the requirement reused.
Note, above are only the preferred embodiment of invention.It will be appreciated by those skilled in the art that the invention is not restricted to institute here
The specific embodiment stated, various obvious changes can be carried out for a person skilled in the art, readjust and substitute and not
Protection scope of the present invention can be departed from.Therefore, although the present invention is described in further detail by above example, but
That the present invention is not limited only to above example, without departing from the inventive concept, can also include it is more other etc.
Effect embodiment, and the scope invented is determined by scope of the appended claims.
Claims (8)
1. the heat treatment method that a kind of carburizing guide is reprocessed, it is characterised in that comprise the following steps：
Step one：Hollow carburizing guide is carried out into Quenching Treatment；
Step 2：The carburizing guide obtained in step one is carried out into secondary quenching process, in the process of secondary quenching process
In cooling treatment is carried out to the inner surface of the carburizing guide；
Step 3：The carburizing guide obtained in step 2 is carried out into lonneal process.
2. the heat treatment method that carburizing guide according to claim 1 is reprocessed, it is characterised in that secondary described in step 2
Quenching Treatment is that the periphery of the carburizing guide to obtaining in step one carries out impewdance matching process, in impewdance matching process
During, Liquid injection cooling is carried out to the inner surface of the carburizing guide.
3. the heat treatment method that carburizing guide according to claim 2 is reprocessed, it is characterised in that sense described in step 2
The holding temperature scope of quenching is 840-900 DEG C, and heating frequency is 10 ± 0.5KHZ.
4. the heat treatment method that carburizing guide according to claim 3 is reprocessed, it is characterised in that Liquid injection cooling in step 2
Cooling medium be water-based hardening liquid, inner surface Liquid injection cooling is carried out to carburizing guide using the water-based hardening liquid.
5. the heat treatment method that carburizing guide according to claim 1 is reprocessed, it is characterised in that quench described in step one
It is processed as carrying out induction diathermic Quenching Treatment to the hollow carburizing guide.
6. the heat treatment method that carburizing guide according to claim 5 is reprocessed, it is characterised in that quench described in step one
The scope of the holding temperature of process is 840-900 DEG C.
7. the heat treatment method that carburizing guide according to claim 6 is reprocessed, it is characterised in that at the quenching in step one
The cooling medium of reason is water-based hardening liquid, and carburizing guide is cooled down using the water-based hardening liquid.
8. the heat treatment method that carburizing guide according to claim 1 is reprocessed, it is characterised in that low temperature described in step 3
The tempering range of tempering is 150-240 DEG C, and tempering insulation time is not less than 150min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611152408.6A CN106636570A (en) | 2016-12-14 | 2016-12-14 | Heat treatment method for repairing of carburization pin bush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611152408.6A CN106636570A (en) | 2016-12-14 | 2016-12-14 | Heat treatment method for repairing of carburization pin bush |
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| Publication Number | Publication Date |
|---|---|
| CN106636570A true CN106636570A (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611152408.6A Pending CN106636570A (en) | 2016-12-14 | 2016-12-14 | Heat treatment method for repairing of carburization pin bush |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109604977A (en) * | 2019-02-21 | 2019-04-12 | 孙永宁 | A kind of manufacturing process of crawler belt guide |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516745A (en) * | 2001-06-07 | 2004-07-28 | 株式会社小松制作所 | Crawler bushing and method and device for producing the same |
| CN203247291U (en) * | 2013-05-02 | 2013-10-23 | 龙工（江西）机械有限公司 | Heat treatment device for tubular workpieces |
-
2016
- 2016-12-14 CN CN201611152408.6A patent/CN106636570A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516745A (en) * | 2001-06-07 | 2004-07-28 | 株式会社小松制作所 | Crawler bushing and method and device for producing the same |
| CN203247291U (en) * | 2013-05-02 | 2013-10-23 | 龙工（江西）机械有限公司 | Heat treatment device for tubular workpieces |
Non-Patent Citations (3)
| Title |
|---|
| 史延令: "销套中频感应穿透加热淬火", 《金属热处理》 * |
| 孙立荣: "浅析推土机履带销套断裂原因", 《华北地区第十九届热处理技术交流会论文集》 * |
| 殷志祥: "低淬透性钢的应用", 《工程机械》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109604977A (en) * | 2019-02-21 | 2019-04-12 | 孙永宁 | A kind of manufacturing process of crawler belt guide |
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Application publication date: 20170510 |
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