CN102888610A - Thermal treatment method for internal spline gear with small modulus - Google Patents
Thermal treatment method for internal spline gear with small modulus Download PDFInfo
- Publication number
- CN102888610A CN102888610A CN2012104093970A CN201210409397A CN102888610A CN 102888610 A CN102888610 A CN 102888610A CN 2012104093970 A CN2012104093970 A CN 2012104093970A CN 201210409397 A CN201210409397 A CN 201210409397A CN 102888610 A CN102888610 A CN 102888610A
- Authority
- CN
- China
- Prior art keywords
- spline
- quenching
- carburizing
- plug
- insulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007669 thermal treatment Methods 0.000 title abstract 4
- 238000010791 quenching Methods 0.000 claims abstract description 33
- 230000000171 quenching Effects 0.000 claims abstract description 29
- 238000009413 insulation Methods 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- 238000005255 carburizing Methods 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000002791 soaking Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 238000004320 controlled atmosphere Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound 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[Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000003607 modifier Substances 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000001311 chemical methods and process Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 10
- 238000005256 carbonitriding Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The invention discloses a thermal treatment method for an internal spline gear with small modulus. The method has a principle similar to a press quenching and is characterized in that: a core rod with the size consistent to the size of a spline internal hole is adopted, as the size of the spline internal hole is basically consistent to the size of the core rod, the core rod is inserted into the spline internal hole when a spline is heated to the quenching temperature and is taken out of a furnace for quenching; due to the principle of expansion with heat and contraction with cold, the spline and the core rod are tightly pressed together after oil feeding; due to the limitation of the size and the shape of the core rod, the deformation is limited in a defined range. According to the thermal treatment method, a controllable atmosphere heat treatment furnace is adopted for carburization; and through controlling furnace temperature, insulation time and carbon potential and selecting a proper core rod for quenching thermal treatment, the deformation requirement after carburization and quenching of the spline internal hole can be met. Meanwhile, the grinding step is omitted, the use requirements of a carburized layer and the hardness of the core part of a part can be ensured.
Description
Technical field
The present invention relates to a kind of heat treating method, especially a kind of little modulus inside spline wheel gear heat treating method.
Background technology
9310 steel are a kind of materials commonly used in the aviation, little modulus inside spline wheel gear by 9310 steel makings not only has outer rotor but also contain internal spline, and its internal spline has the thinner characteristics of through-hole diameter little (diameter is less than 20mm), modulus little (modulus is not more than 1), tooth depth and transverse tooth thickness.Internal spline and outer rotor all are to adopt thermo-chemical treatment because requiring to have preferably wear resistance usually, and the mode that carburizing, carbonitriding are arranged commonly used reaches the performance of design, satisfies service requirements.Quenching strain is in various degree arranged after gear and the carburizing of internal spline class part at present, in order to control this distortion, all is to leave certain cementation zone surplus usually, controls quenching strain by the mode of grinding, reaches the purpose of use.But the method control distortion by grinding is difficult to guarantee that part case depth and heart section satisfy hardness requirement.
Summary of the invention
The purpose of this invention is to provide a kind of little modulus inside spline wheel gear heat treating method, guarantee that the Internal Hole Deformation amount is controlled at more among a small circle behind the carburizing and quenching in, and cementation zone and centre hardness satisfy service requirements.
Main technique route of the present invention is:
(1) prepares 9310 steel parts, gear parts is machined to requires size;
(2) part is carried out modifier treatment in resistance furnace, temperature is 820 ± 6 ℃, insulation 90～100min, and then then oil cooling is incubated 4～4.5h when temperature is 150 ± 10 ℃, and air cooling is come out of the stove;
(3) the processing internal spline is to requiring size;
(4) according to the internal spline dimensioned plug that processes, mandrel material is other material that 9310 steel or quenching and tempering hardness are higher than 9310 steel, and plug need carry out modifier treatment, and plug and spline endoporus tolerance on fit are ± 0.005mm;
(5) with carburizing after the non-carburizing face copper facing protection of part, equipment is the controlled atmosphere cementing furnace, holding temperature is 900 ± 6 ℃, and the carbon potential that the fs adopts is between 0.30～0.40%C, insulation 30～40min, the carbon potential that subordinate phase adopts is between 0.95～0.98%C, insulation 0.5～1h, furnace cooling to 815 after carburizing finishes ± 6 ℃, carbon potential is 0.90～0.95%C, insulation 30～40min, furnace cooling;
(6) with part high tempering in controlled atmosphere generator, temperature is 621 ± 14 ℃, insulation 3～3.5h, and air cooling is come out of the stove;
(7) the protection copper layer of the non-carburizing face of removal;
(8) part is changed in the stove of turning quench, its parameters of quenching is 815 ± 10 ℃ of holding temperatures, and soaking time 105～120min puts into spline endoporus place with plug when part is come out of the stove, and enters at once afterwards oil cooling;
(9) part is taken out from quenching oil after, apply certain pressure with pressing machine plug withdrawed from;
(10) part is carried out ice-cold processing, equipment is refrigerator, holding temperature is≤and-80 ℃, soaking time is 4～4.5h; Part after the ice-cold processing is put into air circulating oven and is carried out low-temperaturetempering, and holding temperature is 150 ± 6 ℃, and soaking time is 4～4.5h, air cooling;
(11) final inspection.
The principle of the invention is similar to press quenching.Adopt the plug with spline endoporus consistent size, because size and the plug size of spline endoporus are basically identical, spline is when being heated to quenching temperature and coming out of the stove quenching, plug is inserted spline endoporus place, owing to expanding with heat and contract with cold, enter the rear spline of oil and plug and be pressed together, be subjected to the restriction of plug shape and size, with limit deformation within the limits prescribed.
The present invention adopts atmosphere controlled heat treatment furnace to carry out carburizing, by the control to furnace temperature, soaking time, carbon potential, chooses suitable plug and carries out quenching heat treatment.Guaranteed the deformation requirements behind the spline endoporus carburizing and quenching.Simultaneously, because the present invention has cancelled the grinding step, therefore guaranteed the service requirements of cementation zone and the centre hardness of part.
Embodiment
The concrete steps of internal spline carburizing and quenching deformation control method are as follows:
(1) prepares 9310 steel parts, gear parts is machined to requires size;
(2) part is carried out modifier treatment in resistance furnace, temperature is 820 ± 6 ℃, insulation 90～100min, and then then oil cooling is incubated 4～4.5h when temperature is 150 ± 10 ℃, and air cooling is come out of the stove;
(3) the processing internal spline is to requiring size;
(4) according to the internal spline dimensioned plug that processes, mandrel material is other material that 9310 steel or quenching and tempering hardness are higher than 9310 steel, and plug need carry out modifier treatment, and plug and spline endoporus tolerance on fit are ± 0.005mm;
(5) with carburizing after the non-carburizing face copper facing protection of part, equipment is the controlled atmosphere cementing furnace, holding temperature is 900 ± 6 ℃, and the carbon potential that the fs adopts is between 0.30～0.40%C, insulation 30～40min, the carbon potential that subordinate phase adopts is between 0.95～0.98%C, insulation 0.5～1h, furnace cooling to 815 after carburizing finishes ± 6 ℃, carbon potential is 0.90～0.95%C, insulation 30～40min, furnace cooling;
(6) with part high tempering in controlled atmosphere generator, temperature is 621 ± 14 ℃, insulation 3～3.5h, and air cooling is come out of the stove;
(7) the protection copper layer of the non-carburizing face of removal;
(8) part is changed in the stove of turning quench, its parameters of quenching is 815 ± 10 ℃ of holding temperatures, and soaking time 105～120min puts into spline endoporus place with plug when part is come out of the stove, and enters at once afterwards oil cooling;
(9) part is taken out from quenching oil after, apply certain pressure with pressing machine plug withdrawed from;
(10) part is carried out ice-cold processing, equipment is refrigerator, holding temperature is≤and-80 ℃, soaking time is 4～4.5h; Part after the ice-cold processing is put into air circulating oven and is carried out low-temperaturetempering, and holding temperature is 150 ± 6 ℃, and soaking time is 4～4.5h, air cooling;
(11) final inspection.
Embodiment
The material that certain engine oil pump gear is selected is 9310 steel, the inner band of this gear spline, and the spline diameter of bore is Φ 11.7mm～Φ 11.9mm, tooth depth, transverse tooth thickness is thinner is 1～2mm.The carburizing parameter and the deformation requirements that require are: effective case depth 0.25～0.51mm, surface hardness HRA81～83, centre hardness HRC33～41.The spline endoporus is no longer processed behind the carburizing and quenching.Be Mp=10.765 before the size carburizing between the roller of spline tooth, require deflection after the carburizing in the 0.05mm scope.
Concrete carburizing and quenching step is:
(1) prepares 9310 steel parts, gear parts is machined to requires size;
(2) part is carried out modifier treatment in resistance furnace, temperature is 820 ℃, insulation 100min, and then then oil cooling is incubated 4h when temperature is 150 ℃, and air cooling is come out of the stove;
(3) the processing internal spline is to requiring size;
(4) according to the internal spline dimensioned plug that processes, mandrel material is other material that 9310 steel or quenching and tempering hardness are higher than 9310 steel, and plug need carry out modifier treatment, and plug and spline endoporus tolerance on fit are ± 0.005mm;
(5) with carburizing after the non-carburizing face copper facing protection of part, equipment is the controlled atmosphere cementing furnace, holding temperature is 900 ℃, and the carbon potential that the fs adopts is 0.40%, insulation 35min, the carbon potential that subordinate phase adopts is 0.96%, insulation 0.8h, furnace cooling to 815 ℃ after carburizing finishes, carbon potential is 0.95%, insulation 35min, furnace cooling;
(6) with part high tempering in controlled atmosphere generator, temperature is 621 ℃, insulation 3h, and air cooling is come out of the stove;
(7) the protection copper layer of the non-carburizing face of removal;
(8) part is changed in the stove of turning quench, its parameters of quenching is 815 ℃ of holding temperatures, and soaking time 110min puts into spline endoporus place with plug when part is come out of the stove, and enters at once afterwards oil cooling;
(9) part is taken out from quenching oil after, apply certain pressure with pressing machine plug withdrawed from;
(10) part is carried out ice-cold processing, equipment is refrigerator, and holding temperature is-80 ℃, and soaking time is 4h; Part after the ice-cold processing is put into air circulating oven and is carried out low-temperaturetempering, and holding temperature is 150 ℃, and soaking time is 4h, air cooling;
(11) final inspection: Mp is Φ 10.735mm behind the carburizing and quenching, and endoporus size distortion amount is 0.03mm, and the more even zero draft of distortion.The effective case depth of part tooth top is 0.46mm, and surface hardness is HRA82.0, centre hardness HRC39.The microstructure of the surface microhardness of material and heart section meets the correlation technique requirement of corresponding air standard 5492 " carburizing of aviation steelwork, carbonitriding microstructure examination standard ".
Claims (1)
1. one kind little modulus inside spline wheel gear heat treating method is characterized in that, the concrete steps of described method are:
(1) prepares 9310 steel parts, gear parts is machined to requires size;
(2) part is carried out modifier treatment in resistance furnace, temperature is 820 ± 6 ℃, insulation 90～100min, and then then oil cooling is incubated 4～4.5h when temperature is 150 ± 10 ℃, and air cooling is come out of the stove;
(3) the processing internal spline is to requiring size;
(4) according to the internal spline dimensioned plug that processes, mandrel material is other material that 9310 steel or quenching and tempering hardness are higher than 9310 steel, and plug need carry out modifier treatment, and plug and spline endoporus tolerance on fit are ± 0.005mm;
(5) with carburizing after the non-carburizing face copper facing protection of part, equipment is the controlled atmosphere cementing furnace, holding temperature is 900 ± 6 ℃, and the carbon potential that the fs adopts is between 0.30～0.40%C, insulation 30～40min, the carbon potential that subordinate phase adopts is between 0.95～0.98%C, insulation 0.5～1h, furnace cooling to 815 after carburizing finishes ± 6 ℃, carbon potential is 0.90～0.95%C, insulation 30～40min, furnace cooling;
(6) with part high tempering in controlled atmosphere generator, temperature is 621 ± 14 ℃, insulation 3～3.5h, and air cooling is come out of the stove;
(7) adopt chemical process to remove the protection copper layer of non-carburizing face;
(8) part is changed in the stove of turning quench, its parameters of quenching is 815 ± 10 ℃ of holding temperatures, and soaking time 105～120min puts into spline endoporus place with plug when part is come out of the stove, and enters at once afterwards oil cooling;
(9) part is taken out from quenching oil after, apply certain pressure with pressing machine plug withdrawed from;
(10) part is carried out ice-cold processing, equipment is refrigerator, holding temperature is≤and-80 ℃, soaking time is 4～4.5h; Part after the ice-cold processing is put into air circulating oven and is carried out low-temperaturetempering, and holding temperature is 150 ± 6 ℃, and soaking time is 4～4.5h, air cooling;
(11) final inspection.
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| CN2012104093970A CN102888610A (en) | 2012-10-24 | 2012-10-24 | Thermal treatment method for internal spline gear with small modulus |
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| CN2012104093970A CN102888610A (en) | 2012-10-24 | 2012-10-24 | Thermal treatment method for internal spline gear with small modulus |
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| CN106555153A (en) * | 2015-09-29 | 2017-04-05 | 常州兰翔机械有限责任公司 | A kind of blade mounting seat heat treatment method |
| CN106555154A (en) * | 2015-09-29 | 2017-04-05 | 常州兰翔机械有限责任公司 | A kind of driven gear heat treatment method |
| CN108193043A (en) * | 2017-11-27 | 2018-06-22 | 江阴市永兴机械制造有限公司 | A kind of low module Thermal treatment method for internal spline gear |
| CN108247304A (en) * | 2018-01-12 | 2018-07-06 | 中国航发哈尔滨东安发动机有限公司 | The method for promoting teeth directional precision after internal spline is heat-treated |
| CN108265170A (en) * | 2018-01-12 | 2018-07-10 | 中国航发哈尔滨东安发动机有限公司 | The method for promoting profile accuracy after internal spline is heat-treated |
| CN108895145A (en) * | 2018-07-17 | 2018-11-27 | 湖南南方宇航高精传动有限公司 | A kind of novel wind-powered electricity generation main-gear box internal spline structure |
| CN109207903A (en) * | 2018-08-29 | 2019-01-15 | 浙江亚美力汽车部件有限公司 | A kind of excavator guide valve fitment anti-carburizi ng technique |
| CN109487069A (en) * | 2018-12-31 | 2019-03-19 | 兴化东华齿轮有限公司 | A kind of heat treatment method of ring gear control heat-treatment distortion |
| CN110355538A (en) * | 2019-06-11 | 2019-10-22 | 北京理工大学 | The processing method of the planetary reduction gear ring gear of bio-robot |
| CN110565043A (en) * | 2019-09-24 | 2019-12-13 | 重庆齿轮箱有限责任公司 | Method for processing gears with different modules on same part |
| CN110714181A (en) * | 2019-10-16 | 2020-01-21 | 中国航发中传机械有限公司 | Heat treatment method of lubricating oil pump gear |
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