CN103540945B - Thin-walled part nitridation deformation control method - Google Patents
Thin-walled part nitridation deformation control method Download PDFInfo
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Abstract
The invention relates to a thin-walled part nitridation deformation control method. The thin-walled part nitridation deformation control method has the characteristics that the reasonable quenching-tempering heat treatment parameters and tempering temperature are selected, so that the stress which is generated in a machining process is reduced to the lowest value; a pretreatment manner before part nitridation is changed, so that a part furnace inlet state requirement is guaranteed; a controlled atmosphere nitridation technology is adopted to carry out nitridation on a thin-walled gear; a condition that the depth of a nitridation layer is 0.10-0.15 mm, the surface hardness HV 0.5 is greater than or equal to 800, the thickness of a white layer is less than or equal to 0.015 mm, and the microscopic structure meets IGC.0463.121A after nitridation of a thin-walled part is guaranteed through the relation among the nitridation quality, the nitrogen decomposition rate and the nitridation temperature; the condition that the part deformation is less than or equal to 0.05 mm is ensured.
Description
Technical field
The present invention relates to a kind of control method, especially a kind of thin-walled parts nitrogenize deformation control method.
Prior art
Nitriding Technology effectively can improve the wear resistance of piece surface, resistance to fatigue, erosion resistance and high thermal resistance because of it, among the manufacture being widely used in aeronautical product part.But for some thin-walled parts, material is 32Cr3MoVE, and the dimensional precision that drawing specifies is high, and infiltration layer narrow range, require that nitride layer controls within the scope of (0.1 ~ 0.15) mm, deformation amount controlling within the scope of 0.05mm, surface hardness HV
0.5>=800, white thickness≤0.015mm, microstructure meets the requirement of IGC.0463.121A.In part, some segment thickness is very thin, is only several millimeters, is very easily out of shape after nitrogenize, and then affects every operating index of part, as tooth-formation of gear, teeth directional precision etc.Be difficult to reach high-precision requirement like this by general nitriding treatment mode, rational heat treatment mode need be found out, by nitrogenize Deformation control within the scope of 0.05mm, domesticly never carried out like this high precision and the so little nitridation treatment method of infiltration layer scope.
Summary of the invention
The object of this invention is to provide one can make thin-walled parts nitride layer control within the scope of (0.1 ~ 0.15) mm, deformation amount controlling within the scope of 0.05mm, surface hardness HV
0.5>=800, white thickness≤0.015mm, microstructure meets the nitriding heat treating method of IGC.0463.121A.Operational path of the present invention is:
(1) preparing material is the thin-walled parts of 32Cr3MoVE;
(2) roughing is carried out to part, after processing, ensure that the monolateral surplus of part is at more than 1mm;
(3) part is put into few oxidation furnaces to quench, quenching temperature is 950 ± 10 DEG C, and soaking time is 60 ~ 90min, takes out after oil cooling; Then put into high tempering stove and carry out tempering, tempering temperature is 660 ± 20 DEG C, and soaking time is 120 ~ 150min, comes out of the stove after air cooling;
(4) semi-finishing is carried out to the web on part part needing coordinate with outside relative dimensions and part, after processing, ensure that one side surplus is less than 0.5mm;
(5) part is put into controlled atmosphere nitriding furnace and carry out stable tempering, temperature is 580 ± 5 DEG C, soaking time is 5 ~ 5.5h, furnace cooling, logical argon gas in whole process, in intensification, insulating process, argon flow amount is 2 ~ 5L/min, argon flow amount >=5L/min during cooling, furnace cooling stops argon gas after being less than 150 DEG C, and part is come out of the stove;
(6) various piece of part is machined to the dimensions that drawing specifies;
(7) zellon steam is adopted to carry out oil removing to part;
(8) part is put into controlled atmosphere nitriding furnace by overall for part nitriding, part is warming up to 200 ± 5 DEG C with stove, insulation 1 ~ 1.5h; Then 300 ± 5 DEG C are warming up to stove, insulation 1 ~ 1.5h; Then 400 ± 5 DEG C are warming up to stove, insulation 1 ~ 1.5h; Then be warming up to 490 ± 5 DEG C with stove, insulation 12 ~ 15h, in whole process, the rate of decomposition of ammonia is 12 ~ 17%, is finally chilled to less than 150 DEG C with stove and comes out of the stove;
(9) final inspection.
The present invention is by selecting rational Tempering and Quenching parameter and tempering temperature, machine is added the stress drop produced in process extremely minimum, the pretreatment mode changed before part nitriding ensures that part enters the conditions dictate of stove, controlled atmosphere nitridation technique is adopted to carry out nitriding to thin-wall gear, by the relation between nitrogenize quality, nitrogen rate of decomposition, nitriding temperature, after ensure that thin-walled parts nitrogenize, nitrided case depth at 0.10 ~ 0.15mm, surface hardness HV
0.5>=800, white thickness≤0.015mm, microstructure meets IGC.0463.121A, and ensures part deformation amount≤0.05mm.
Embodiment
The step of thin-walled parts nitrogenize deformation control method is:
(1) preparing material is the thin-walled parts of 32Cr3MoVE;
(2) roughing is carried out to part, after processing, ensure that the monolateral surplus of part is at more than 1mm;
(3) part is put into few oxidation furnaces to quench, quenching temperature is 950 ± 10 DEG C, and soaking time is 60 ~ 90min, takes out after oil cooling; Then put into high tempering stove and carry out tempering, tempering temperature is 660 ± 20 DEG C, and soaking time is 120 ~ 150min, comes out of the stove after air cooling;
(4) semi-finishing is carried out to the web on part part needing coordinate with outside relative dimensions and part, after processing, ensure that one side surplus is less than 0.5mm;
(5) part is put into controlled atmosphere nitriding furnace and carry out stable tempering, temperature is 580 ± 5 DEG C, soaking time is 5 ~ 5.5h, furnace cooling, logical argon gas in whole process, in intensification, insulating process, argon flow amount is 2 ~ 5L/min, argon flow amount >=5L/min during cooling, furnace cooling stops argon gas after being less than 150 DEG C, and part is come out of the stove;
(6) various piece of part is machined to the dimensions that drawing specifies;
(7) zellon steam is adopted to carry out oil removing to part;
(8) part is put into controlled atmosphere nitriding furnace by overall for part nitriding, part is warming up to 200 ± 5 DEG C with stove, insulation 1 ~ 1.5h; Then 300 ± 5 DEG C are warming up to stove, insulation 1 ~ 1.5h; Then 400 ± 5 DEG C are warming up to stove, insulation 1 ~ 1.5h; Then be warming up to 490 ± 5 DEG C with stove, insulation 12 ~ 15h, in whole process, the rate of decomposition of ammonia is 12 ~ 17%, is finally chilled to less than 150 DEG C with stove and comes out of the stove;
(9) final inspection.
Embodiment
Material is certain type machine 59 tooth lubricating oil pump gear of 32Cr3MoVE, and maximum outside diameter is Φ 123mm, and the thick 2mm of former, after requiring nitrogenize, nitrided case depth is at 0.10 ~ 0.15mm, surface hardness HV
0.5>=800, white thickness≤0.015mm, microstructure meets IGC.0463.121A, and ensures part deformation amount≤0.05mm.
(1) the lubricating oil pump gear that material is 32Cr3MoVE is prepared;
(2) roughing is carried out to part, after processing, ensure that the monolateral surplus of part is at more than 1mm;
(3) part is put into few oxidation furnaces to quench, quenching temperature is 950 DEG C, and soaking time is 80min, takes out after oil cooling; Then put into high tempering stove and carry out tempering, tempering temperature is 660 DEG C, and soaking time is 150min, comes out of the stove after air cooling;
(4) semi-finishing is carried out to the web on part part needing coordinate with outside relative dimensions and part, after processing, ensure that one side surplus is all less than 0.5mm;
(5) part is put into controlled atmosphere nitriding furnace and carry out stable tempering, temperature is 580 DEG C, soaking time is 5h, furnace cooling, logical argon gas in whole process, in intensification, insulating process, argon flow amount is 5L/min, and during cooling, argon flow amount is 8L/min, stop argon gas after cooling to 120 DEG C with the furnace, part is come out of the stove;
(6) various piece of part is machined to the dimensions that drawing specifies;
(7) zellon steam is adopted to carry out oil removing to part;
(8) part is put into controlled atmosphere nitriding furnace by overall for part nitriding, part is warming up to 200 DEG C with stove, insulation 15h; Then 300 DEG C are warming up to stove, insulation 1h; Then 400 DEG C are warming up to stove, insulation 1h; Then be warming up to 490 DEG C with stove, insulation 12h, in whole process, the rate of decomposition of ammonia is 15%, is finally chilled to 120 DEG C with stove and comes out of the stove;
(9) final inspection: the nitrided case depth 0.14mm of part, surface hardness HV
0.5=860, white thickness 0.006mm, microstructure meets IGC.0463.121A, and gear maximum deformation quantity is 0.03mm.Conclusion: qualified.
Claims (1)
1. a thin-walled parts nitrogenize deformation control method, is characterized in that, described method comprises the following steps:
(1) preparing material is the thin-walled parts of 32Cr3MoVE;
(2) roughing is carried out to part, after processing, ensure that the monolateral surplus of part is at more than 1mm;
(3) part is put into few oxidation furnaces to quench, quenching temperature is 950 ± 10 DEG C, and soaking time is 60 ~ 90min, takes out after oil cooling; Then put into high tempering stove and carry out tempering, tempering temperature is 660 ± 20 DEG C, and soaking time is 120 ~ 150min, comes out of the stove after air cooling;
(4) semi-finishing is carried out to the web on part part needing coordinate with outside relative dimensions and part, after processing, ensure that one side surplus is less than 0.5mm;
(5) part is put into controlled atmosphere nitriding furnace and carry out stable tempering, temperature is 580 ± 5 DEG C, soaking time is 5 ~ 5.5h, furnace cooling, logical argon gas in whole process, in intensification, insulating process, argon flow amount is 2 ~ 5L/min, argon flow amount >=5L/min during cooling, furnace cooling stops argon gas after being less than 150 DEG C, and part is come out of the stove;
(6) various piece of part is machined to the dimensions that drawing specifies;
(7) zellon steam is adopted to carry out oil removing to part;
(8) part is put into controlled atmosphere nitriding furnace by overall for part nitriding, part is warming up to 200 ± 5 DEG C with stove, insulation 1 ~ 1.5h; Then 300 ± 5 DEG C are warming up to stove, insulation 1 ~ 1.5h; Then 400 ± 5 DEG C are warming up to stove, insulation 1 ~ 1.5h; Then be warming up to 490 ± 5 DEG C with stove, insulation 12 ~ 15h, in whole process, the rate of decomposition of ammonia is 12 ~ 17%, is finally chilled to less than 150 DEG C with stove and comes out of the stove;
(9) final inspection.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104384876B (en) * | 2014-10-23 | 2016-08-24 | 哈尔滨东安发动机（集团）有限公司 | High class gear manufacture method |
| CN106609318A (en) * | 2015-10-27 | 2017-05-03 | 陕西宏远航空锻造有限责任公司 | Refining method for grain size of 32Cr3MoVE forge piece |
| CN106002124B (en) * | 2015-12-28 | 2018-02-09 | 苏州斯莱克智能模具制造有限公司 | A kind of processing method of the involute side ring of easy open cover die with edge-folded |
| CN107641784B (en) * | 2017-09-08 | 2019-12-27 | 厦门真冈热处理有限公司 | Heat treatment method for drum-shaped tooth type coupling of wind driven generator |
| CN109945823B (en) * | 2019-04-17 | 2021-09-14 | 株洲齿轮有限责任公司 | Method for detecting deformation of steel part in machining process |
| CN117467925A (en) * | 2023-08-24 | 2024-01-30 | 江苏美特林科特殊合金股份有限公司 | Thin-wall part nitriding deformation control method |
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