CN105274309A - Subzero treatment technique for improving surface hardness of gear - Google Patents
Subzero treatment technique for improving surface hardness of gear Download PDFInfo
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- CN105274309A CN105274309A CN201510769093.9A CN201510769093A CN105274309A CN 105274309 A CN105274309 A CN 105274309A CN 201510769093 A CN201510769093 A CN 201510769093A CN 105274309 A CN105274309 A CN 105274309A
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- gear
- surface hardness
- tempering
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- carburizing
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Abstract
The invention discloses a subzero treatment technique for improving the surface hardness of a gear. According to the subzero treatment technique, a heat treatment technique of carburizing and quenching is combined with a subzero technique, and the surface hardness of the gear is improved, so that the service life of the gear is prolonged. The treatment technique comprises the following steps of cleaning, preheating, carburizing, quenching, primary tempering, subzero treatment and secondary tempering. Compared with the prior art, a new technique that the subzero treatment is conducted after the primary tempering and then the secondary tempering treatment is conducted is adopted, so that the surface hardness and the anti-corrosion property of the gear are improved after carburizing and quenching.
Description
Technical field
The present invention relates to the technical field of carburizing and quenching and deep cooling, specifically carburizing and quenching in conjunction with cryogenic technology with the use of, thus effectively improve the work-ing life of gear gear.
Background technology
Gear is the major parts in engine mission, and effect is within the engine most important.The failure mode of gear has multiple, and wherein the low fatigue flake etc. caused of surface hardness largely can reduce gear life.What current heat treatment industry adopted gear is mostly carburizing quenching process, seldom adopts cryogenic technology after quenching, because gear surface has abundant residues austenite, causes the hardness of gear surface low.Therefore, the technique of research carburizing and quenching and cooperation deep cooling seems particularly important, ties between the two, can obtain good comprehensive mechanical property.
Summary of the invention
The present invention is the combination to existing heat treatment technics and cryogenics, effectively raise the surface hardness of gear, thus enhance wear resistance and the obdurability of gear, prevent peeling off of hardened layer, improve the generation of broken teeth phenomenon, improve the work-ing life of gear.
To achieve these goals, a kind of cryogenic technology improving gear surface hardness is designed
, it is characterized in that: described concrete technology is as follows:
(1) clean: gear good for machining is cleaned 40 ~ 60min in hydrocarbon cleaning machine
(2) preheating: by cleaned gear preheating 30 ~ 50min in box-type furnace
(3) carburizing: gear is sent into multipurpose furnace carburizing, carbon potential parameter 0.75 ~ 0.85Cp, temperature is 870 ~ 910 DEG C.
(4) quench: move gear to cup oil groove from rear room, 810 ~ 835 DEG C of oil quenchings.
(5) tempering: gear is sent into chamber type annealing stove, temperature is 160 ~ 180 DEG C, soaking time 120 ~ 180min.
(6) sub-zero treatment: the gear after first time tempering is placed in liquid nitrogen insulation 1 ~ 5h, finally gear taking-up is placed in room temperature and rises again.
(7) double tempering: the gear being returned to room temperature is sent into chamber type annealing stove, with 160 ~ 180 DEG C of double temperings, soaking time 120 ~ 180min.
Described gear material is soft steel.
Described oil quenching cools for utilizing oil.
The present invention compared with prior art, is the combination to existing heat treatment technics and cryogenics, effectively raises the surface hardness of gear, thus enhance the wear resistance of gear, prevent peeling off of hardened layer, improve the generation of broken teeth phenomenon, greatly improve the work-ing life of gear.
Embodiment
Below in conjunction with the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
Gear good for machining is cleaned 40min in hydrocarbon cleaning machine, then preheating 50min in box-type furnace; Preheated gear is sent into multipurpose furnace carburizing, carbon potential parameter 0.85Cp, temperature is 890 DEG C; Then cup oil groove 820 DEG C of oil quenchings are moved to from rear room; Then gear is sent into chamber type annealing stove, with 170 DEG C of tempering, insulation 160min; Gear after a tempering is put into liquid nitrogen and is incubated 3h, then gear taking-up is placed in room temperature and rises again; Finally the gear being returned to room temperature is sent into chamber type annealing stove, with 170 DEG C of double temperings, insulation 180min.
Be 730HV according to above-mentioned art breading rear surface hardness.
Embodiment 2
Gear good for machining is cleaned 60min in hydrocarbon cleaning machine, then preheating 30min in box-type furnace; Preheated gear is sent into multipurpose furnace carburizing, carbon potential parameter 0.8Cp, temperature is 880 DEG C; Then cup oil groove 830 DEG C of oil quenchings are moved to from rear room; Then gear is sent into chamber type annealing stove, with 180 DEG C of tempering, insulation 170min; Gear after a tempering is put into liquid nitrogen and is incubated 4h, then gear taking-up is placed in room temperature and rises again; Finally the gear being returned to room temperature is sent into chamber type annealing stove, with 180 DEG C of double temperings, insulation 120min.
Surface hardness 750HV is obtained according to after above-mentioned art breading.
Embodiment 3
Gear good for machining is cleaned 50min in hydrocarbon cleaning machine, then preheating 40min in box-type furnace; Preheated gear is sent into multipurpose furnace carburizing, carbon potential parameter 0.75Cp, temperature is 900 DEG C; Then cup oil groove 815 DEG C of oil quenchings are moved to from rear room; Then gear is sent into chamber type annealing stove, with 160 DEG C of tempering, insulation 130min; Gear after a tempering is put into liquid nitrogen and is incubated 5h, then gear taking-up is placed in room temperature and rises again; Finally the gear being returned to room temperature is sent into chamber type annealing stove, with 165 DEG C of double temperings, insulation 150min.
According to the surface hardness 730HV obtained after above-mentioned art breading.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.
In addition, be to be understood that, although this specification sheets is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification sheets is only for clarity sake, those skilled in the art should by specification sheets integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (3)
1. improve a cryogenic treatment process for gear surface hardness, it is characterized in that:
(1) clean: tunnel shaft good for machining is cleaned 40 ~ 60min in hydrocarbon cleaning machine;
(2) preheating: by cleaned gear preheating 30 ~ 50min in box-type furnace;
(3) carburizing: gear is sent into multipurpose furnace carburizing, carbon potential parameter 0.75 ~ 0.85Cp, temperature 870 ~ 910 DEG C;
(4) quench: move gear to cup oil groove 810 ~ 835 DEG C of oil quenchings from rear room;
(5) tempering: gear is sent into chamber type annealing stove, temperature is 160 ~ 180 DEG C, soaking time 120 ~ 180min;
(6) sub-zero treatment: the gear after a tempering is put into liquid nitrogen insulation 1 ~ 5h, then gear taking-up is placed in room temperature and rises again;
(7) double tempering: the gear being returned to room temperature is sent into chamber type annealing stove, and tempering temperature is 160 ~ 180 DEG C, insulation 120 ~ 180min.
2. a kind of cryogenic technology improving axle tooth surface hardness according to claim 1, is characterized in that: described gear material is soft steel.
3. a kind of cryogenic technology improving axle tooth surface hardness according to claim 1, is characterized in that: direct geared is put into liquid nitrogen by the described sub-zero treatment type of cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510769093.9A CN105274309A (en) | 2015-11-12 | 2015-11-12 | Subzero treatment technique for improving surface hardness of gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510769093.9A CN105274309A (en) | 2015-11-12 | 2015-11-12 | Subzero treatment technique for improving surface hardness of gear |
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| CN105274309A true CN105274309A (en) | 2016-01-27 |
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| CN201510769093.9A Pending CN105274309A (en) | 2015-11-12 | 2015-11-12 | Subzero treatment technique for improving surface hardness of gear |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105586477A (en) * | 2016-03-01 | 2016-05-18 | 江苏星火特钢有限公司 | Method for improving hardness of 3D printing martensitic stainless steel structural part |
| CN107022674A (en) * | 2016-01-29 | 2017-08-08 | 南通宏大机电制造有限公司 | A kind of pair of output shaft magnetic powder clutch is with defeated in/out axis processing technique |
| CN108411093A (en) * | 2018-03-26 | 2018-08-17 | 湖南特科能热处理有限公司 | A kind of heat treatment process reducing transfer-case idle shaft gear shifting quadrant texturing |
| CN109321739A (en) * | 2018-12-04 | 2019-02-12 | 常熟天地煤机装备有限公司 | A kind of heat-treatment processing process of big infiltration layer heavy-duty gear |
| CN110229952A (en) * | 2019-07-02 | 2019-09-13 | 无锡市聚英机械制造有限公司 | The heat treatment process of heavy-duty gear |
| CN113073182A (en) * | 2021-03-11 | 2021-07-06 | 南通大学 | Processing method for improving comprehensive performance of maritime work E690 high-strength steel |
| CN113174466A (en) * | 2021-04-30 | 2021-07-27 | 洛阳Lyc轴承有限公司 | Induction quenching method for 40Cr15Mo2VN high-nitrogen stainless bearing steel |
| CN115637403A (en) * | 2022-02-24 | 2023-01-24 | 宁波市精恒凯翔机械有限公司 | Machining process of barreling tool |
| CN117802446A (en) * | 2024-03-01 | 2024-04-02 | 山东天瑞重工有限公司 | Heat treatment process method of low-carbon high-alloy structural steel and hydraulic breaking hammer piston |
-
2015
- 2015-11-12 CN CN201510769093.9A patent/CN105274309A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107022674A (en) * | 2016-01-29 | 2017-08-08 | 南通宏大机电制造有限公司 | A kind of pair of output shaft magnetic powder clutch is with defeated in/out axis processing technique |
| CN105586477A (en) * | 2016-03-01 | 2016-05-18 | 江苏星火特钢有限公司 | Method for improving hardness of 3D printing martensitic stainless steel structural part |
| CN108411093A (en) * | 2018-03-26 | 2018-08-17 | 湖南特科能热处理有限公司 | A kind of heat treatment process reducing transfer-case idle shaft gear shifting quadrant texturing |
| CN109321739A (en) * | 2018-12-04 | 2019-02-12 | 常熟天地煤机装备有限公司 | A kind of heat-treatment processing process of big infiltration layer heavy-duty gear |
| CN110229952A (en) * | 2019-07-02 | 2019-09-13 | 无锡市聚英机械制造有限公司 | The heat treatment process of heavy-duty gear |
| CN113073182A (en) * | 2021-03-11 | 2021-07-06 | 南通大学 | Processing method for improving comprehensive performance of maritime work E690 high-strength steel |
| CN113174466A (en) * | 2021-04-30 | 2021-07-27 | 洛阳Lyc轴承有限公司 | Induction quenching method for 40Cr15Mo2VN high-nitrogen stainless bearing steel |
| CN115637403A (en) * | 2022-02-24 | 2023-01-24 | 宁波市精恒凯翔机械有限公司 | Machining process of barreling tool |
| CN117802446A (en) * | 2024-03-01 | 2024-04-02 | 山东天瑞重工有限公司 | Heat treatment process method of low-carbon high-alloy structural steel and hydraulic breaking hammer piston |
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Application publication date: 20160127 |
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| WD01 | Invention patent application deemed withdrawn after publication |