CN106756755B - The carburization quenching method of large excavator gear - Google Patents
The carburization quenching method of large excavator gear Download PDFInfo
- Publication number
- CN106756755B CN106756755B CN201611141404.8A CN201611141404A CN106756755B CN 106756755 B CN106756755 B CN 106756755B CN 201611141404 A CN201611141404 A CN 201611141404A CN 106756755 B CN106756755 B CN 106756755B
- Authority
- CN
- China
- Prior art keywords
- gear
- carburizing
- carburizer
- temperature
- force
- 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.)
- Active
Links
- 238000010791 quenching Methods 0.000 title claims abstract description 60
- 230000000171 quenching Effects 0.000 title claims abstract description 57
- 238000005255 carburizing Methods 0.000 claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 36
- 229910052799 carbon Inorganic materials 0.000 claims description 36
- 238000009792 diffusion process Methods 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000004321 preservation Methods 0.000 claims description 17
- 238000004140 cleaning Methods 0.000 claims description 14
- XEKOWRVHYACXOJ-UHFFFAOYSA-N acetic acid ethyl ester Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000001294 propane Substances 0.000 claims description 3
- BDERNNFJNOPAEC-UHFFFAOYSA-N propanol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 claims 1
- 239000002244 precipitate Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 11
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 230000001131 transforming Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 210000004940 Nucleus Anatomy 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 235000019241 carbon black Nutrition 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000005712 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000011068 load Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 210000001519 tissues Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
Abstract
The present invention relates to a kind of carburization quenching methods of large excavator gear, include the following steps：Heat up samming step；Ooze step by force；Diffusing step；Cool down samming step；Primary quenching step；Isothermal spheroidizing step；Secondary quenching step；Lonneal step.The large excavator gear carburizing quenching method of the present invention can substantially shorten the carburizing and quenching time, obtain high carburizing speed, save energy consumption, improve production efficiency, simultaneously again can effective crystal grain thinning, obtain the acinous carbide of Dispersed precipitate, improve the metallographic structure of gear surface, the tooth face hardness and wearability for improving gear, improve the service life of gear.
Description
Technical field
The present invention relates to a kind of carburization quenching methods of large excavator gear, belong to technical field of heat treatment.
Background technology
Excavator is usually to realize continuous work with speed reduction gear box power by motor operation acting by electric drive
The engineering machinery of industry.As China is in the swift and violent hair of the various aspects infrastructure construction such as road traffic, energy-water, urban construction
Exhibition, large excavator market demand rise year by year, and development prospect is powerful.But large excavator working environment is more complicated,
Reduction box internal gear is easy to be influenced and fail by load impacting and mechanical oscillation.Therefore, large excavator gear is not only held
Load-carrying, impact force is strong, and security performance requires high, and when use requires to have excellent case hardness, wear-resisting property and overload-resistant
Ability had both required the case depth of gear teeth face deeper, and required the center portion good mechanical properties of gear.
Currently, the raw material of large excavator gear are frequently with 18Cr2Ni4WA steel alloys, carburization quenching method such as Fig. 2 institutes
Show, large excavator gear, which is placed on carburizing in-furnace temperature, increases 920 ± 5 DEG C, and progress is oozed 10-12 hours by force, synthermal
Under be diffused 10-12 hours, in strong ooze carbon potential CP controls 1.20 ± 0.05%, and carbon potential CP when spreading be 0.85 ±
0.05%, oil hardening is carried out after being then down to 830 ± 5 DEG C of heat preservations 1-2 hours with stove, then gear is placed in tempering furnace and is heated to
160-220 DEG C of progress lonneal, soaking time 2-3h；Then it comes out of the stove and is air-cooled to room temperature.The carburizing temperature of this method is low, by force
Carburizing gesture is high, and a large amount of carbon blacks are easily deposited in stove, causes carbon potential in stove to fluctuate, is created great difficulties to carbon-potential control.Meanwhile the party
Method carburizing time is long, and is in same temperature, since the carbide formers such as Cr, W in steel can form stable conjunction with carbon
Golden carbide, it is strong to inhale carbon ability, so that carburized layer concentration of carbon is increased, is unfavorable for the diffusion of carbon, carburized layer concentration gradient steepening,
Easily there is big blocky, net carbide, destroys the continuity of matrix, seriously affected quality of carburized layer, gear is made to exist
It is also easy to produce grinding crack in follow-up Grinding Process, and gear is made to be easy to fatigue under periodic contact stress, is formed
Point and surface layer peeling.
Invention content
The object of the present invention is to provide a kind of carburization quenching methods of large excavator gear, can substantially shorten carburizing and quenching
Time obtains high carburizing speed, saves energy consumption, moreover it is possible to and objectionable carbides are eliminated, the acinous carbide of Dispersed precipitate is obtained,
And improve production efficiency.
The technical solution of the present invention in order to achieve the above objectives is：A kind of carburization quenching method of large excavator gear,
It is characterized in that：Include the following steps,
(1), heat up samming step, first gear is placed in carburizer and is heated to 750 ± 10 DEG C, keeps the temperature 3-4h；
(2), step oozed by force, carburizer heating, with stove heat to 960-980 DEG C, into carburizer be passed through carburizer oozes gear
Carbon, control carbon potential CP maintain one section of carburizing time t to ooze by force in 1.30 ± 0.05C%；
(3), diffusing step, carburizer heating, gear, to 1040-1060 DEG C, carburizer are passed through into carburizer with stove heat
Carburizing, control carbon potential CP is 0.90 ± 0.05C%, and the diffusion of diffusion time t is carburizing time t oozes by force when oozing by force 1.5 times；
(4), cool down samming step, reduce furnace temperature, and gear is down to 840 ± 10 DEG C with stove, carburizing is passed through into carburizer
Agent carburizing maintains carbon potential CP in stove and to keep the temperature 2-3h in 0.90 ± 0.05C% in temperature-fall period,；
(5) 840 ± 10 DEG C of gear is carried out oil quenching, and quenches oil temperature at 65-95 DEG C by, primary quenching step；
(6) quenched gear for the first time is heated to 650 ± 10 DEG C, heat preservation 3- by, isothermal spheroidizing step in stove
4h；Gear heating is heated to 720 ± 10 DEG C, heat preservation 3-4h again；Gear is then cooled to 650 ± 10 DEG C, heat preservation 5-6h；Most
Backgear cools to 550 DEG C with the furnace, comes out of the stove and is air-cooled to room temperature；
(7) the gear after isothermal spheroidizing is heated to 760 ± 10 DEG C, heat preservation by, secondary quenching step in stove
3-4h；Gear is warming up to 820 ± 10 DEG C, heat preservation 2-3h with stove again；Then oil quenching will be carried out in 820 ± 10 DEG C of gear, quenched
Kerosene temperature is 65-95 DEG C；
(8) gear is placed in tempering furnace and is heated to 180-260 DEG C of progress lonneal, when heat preservation by, lonneal step
Between be 3-4h；Then it comes out of the stove and is air-cooled to room temperature.
It is wherein, described that strong to ooze the sum of the diffusion time t diffusion that the carburizing time t in step is blended by force in diffusing step be total
Carburizing time t carburizings, and total carburizing time t carburizings=(δ/K) 2, wherein δ is depth of penetration (mm), and K is carburizing temperature coefficient.
The strong carburizing time t oozed in step oozes by force in 8-10h.
In the diffusing step, diffusion time, t was diffused in 12-15h.
Between the first time quenching Step and isothermal spheroidizing step and second of quenching Step and lonneal
Further include cleaning step between step, cleaning removal gear component surface oil stain, the temperature of cleaning solution is controlled in 50- when cleaning
60℃。
It is described it is strong ooze in step, diffusing step and cooling samming step, the carburizer used for methanol, ethane, propane,
Any one or more of ethyl alcohol, propyl alcohol, ethyl acetate.
It is described it is strong ooze in step, diffusing step and cooling samming step, the carbon potential by adjust carburizing agent flux come
Control.
In the lonneal step, the number of lonneal is twice.
The large excavator gear steel material is 18Cr2Ni4WA.
The present invention gear is carried out successively heating samming, ooze by force, spread, the samming that cools down, quenching for the first time, isothermal spheroidizing moves back
It fire and second quenches, due to greatly improved carburizing temperature, and diffusion temperature higher than oozing temperature, diffusion time t by forceDiffusionIt is
Carburizing time t when oozing by forceIt oozes by force1.5 times, because carbon penetrate into steel in maximum speed by carbon, the diffusion velocity in austenite is limited,
And this diffusion velocity and temperature direct proportionality, therefore, carburization quenching method of the present invention passes through the high strong temperature and strong of oozing
Carburizing gesture forms very high concentration of carbon in workpiece surface within a short period of time, by higher diffusion temperature and longer
Diffusion time makes the carbon for oozing the carbon-rich zone of section by force gradually be elapsed to deep layer, to obtain high carburizing speed, when shortening heat treatment
Between, reduce energy consumption, also can effective gentle carburized layer carbon profile, reduce the big bulk that gear surface carburized layer easily occurs
Carbide obtains acinous carbide, improves the metallographic structure of gear surface, improve the tooth face hardness and wearability of gear.This
Invention carries out isothermal spheroidizing to the gear after carburizing, makes its elder generation 20 DEG C of austenitizings more than Ac1 temperature, carbide is made to fill
Divide dissolving, then 50 DEG C of generation isothermal transformation below Ac1 temperature obtain the equally distributed fine grained carbonization of disperse of nodularization
Object, for the Refined Carbide Particle of this Dispersed precipitate in subsequent quenching process, the spread is more perfect, is not only final quenching
Heating has prepared a large amount of crystallization nuclei, and Quench heating austenite can be made further to homogenize, and can obviously refine and quench
Fire tissue, significantly improves the comprehensive performances such as the intensity after gear quenching, hardness.Present invention employs heating quenchings twice, can have
Crystal grain thinning is imitated, crystal grain, which is grown up, caused by being improved to carburizing temperature plays good optimization function.
Description of the drawings
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is artwork of the present invention to the carburization quenching method of large excavator gear.
Fig. 2 is schematic diagram of the prior art to the carburization quenching method of large excavator gear.
Specific implementation mode
As shown in Figure 1, the carburization quenching method of large excavator gear of the invention, includes the following steps.
(1), heat up samming step, first gear is placed in carburizer and is heated to 750 ± 10 DEG C, keeps the temperature 3-4h.
(2), step oozed by force, carburizer heating, with stove heat to 960-980 DEG C, into carburizer be passed through carburizer oozes gear
Carbon, control carbon potential CP are controlled in 1.30 ± 0.05C%, carbon potential by adjusting carburizing agent flux, maintain one section of carburizing time
tIt oozes by force, the carburizing time t when present invention is oozed by forceIt oozes by forceCan be controlled in 8-10h, by improving the temperature oozed by force and strong carburizing gesture, compared with
Very high concentration of carbon is formd in workpiece surface in short time.
(3), diffusing step, carburizer heating, with stove heat to 1040-1060 DEG C, diffusion heating rate is can be controlled in gear
150-350 DEG C/h, it is passed through carburizer carburizing into carburizer, control carbon potential CP is in 0.90 ± 0.05C%, and diffusion time tDiffusion
It is carburizing time t when oozing by forceIt oozes by force1.5 times, same carbon potential is controlled by adjusting carburizing agent flux, and diffusion time tDiffusionIt keeps
12-15h.The present invention makes the carbon for oozing the carbon-rich zone of section by force gradually to deep layer by higher diffusion temperature and long diffusion time
Passage, to obtain high carburizing speed, also can effective gentle carburized layer carbon profile, reduce gear surface carburized layer
The big massive carbide easily occurred obtains acinous carbide, improves the metallographic structure of gear surface, the flank of tooth for improving gear is hard
Degree and wearability.
(4), cool down samming step, reduce furnace temperature, and gear is down to 840 ± 10 DEG C with stove, and cooling rate is can be controlled in
120-240 DEG C/h, carburizer carburizing is passed through into carburizer, carbon potential is controlled by adjusting carburizing agent flux, in temperature-fall period
Carbon potential CP keeps the temperature 2-3h in 0.90 ± 0.05C% in middle maintenance stove, to keep the concentration of carbon of carburized layer, and is quenched by controlling
Temperature, to obtain the carburized layer of high quality.
(5) 840 ± 10 DEG C of gear is carried out oil quenching, and quenches oil temperature at 65-95 DEG C by, primary quenching step, makes Austria
Family name's body changes.
(6) quenched gear for the first time is heated to 650 ± 10 DEG C, heat preservation 3- by, isothermal spheroidizing step in stove
4h；Gear heating is heated to 720 ± 10 DEG C, heat preservation 3-4h again；Gear is then cooled to 650 ± 10 DEG C, heat preservation 5-6h；Most
Backgear cools to 550 DEG C with the furnace, comes out of the stove and is air-cooled to room temperature.The present invention carries out isothermal spheroidizing to the gear after carburizing, can
Carbide is set fully to dissolve, then 50 DEG C of generation isothermal transformation below Ac1 temperature, the disperse for obtaining nodularization is equally distributed thin
Granule carbonide.
(7) the gear after isothermal spheroidizing is heated to 760 ± 10 DEG C, heat preservation by, secondary quenching step in stove
3-4h；Gear is warming up to 820 ± 10 DEG C, heat preservation 2-3h again；Then oil quenching, quenching oil will be carried out in 820 ± 10 DEG C of gear
Temperature is 65-95 DEG C, and the present invention makes the thin of Dispersed precipitate by carrying out quenching treatment again to the gear after isothermal spheroidizing
Granule carbonide spread in quenching process is more perfect, so that Quench heating austenite further homogenizes, it can be apparent
Quenching structure is refined, improves the metallographic structure of gear surface, significantly improves the comprehensive performances such as the intensity after gear quenching, hardness.
(8) gear is placed in tempering furnace and is heated to 180-260 DEG C of progress lonneal, when heat preservation by, lonneal step
Between be 3-4h；Then it comes out of the stove and is air-cooled to room temperature.In the lonneal step of the present invention, the number of lonneal is twice, to pass through
Multiple lonneal keeps the high rigidity and wearability of quenching workpiece, reduces quenching residual stress and brittleness.
The present invention oozes by force the carburizing time t in stepIt oozes by forceWith the diffusion time t in diffusing stepDiffusionThe sum of be total carburizing when
Between tCarburizing, and total carburizing time tCarburizing=(δ/K)2, wherein δ is depth of penetration (mm), and K is carburizing temperature coefficient, therefore can basis
The depth of penetration of design requirement setting gear and the carburizing temperature coefficient of selection control total carburizing time tCarburizing。
The present invention is between first time quenching Step and isothermal spheroidizing step and second of quenching Step and low temperature
Further include cleaning step between tempering step, cleaning removal gear component surface oil stain, the temperature control of cleaning solution when cleaning
At 50-60 DEG C, and cleaning solution uses conventional cleaning solution, such as kerosene etc..
The present invention is in oozing by force step and diffusing step and carburizer used by cooling samming step is methanol, second
Any one or more of alkane, propane, ethyl alcohol, propyl alcohol, ethyl acetate.
Large excavator gear of the present invention uses steel material for 18Cr2Ni4WA, with carburization quenching method pair of the present invention
Gear made from 18Cr2Ni4WA carries out carburizing and quenching processing, and specific carburizing and quenching Processing Example is shown in Table 1.
Table 1
Test specimen made from carburization quenching method using the present invention is detected, specifically by GB/T228, GB/T229 standard
Data are shown in Table 2.
Table 2
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Tensile strength (MPa) | 1450 | 1480 | 1420 | 1420 | 1450 | 1460 |
| Yield strength (MPa) | 950 | 975 | 955 | 960 | 955 | 960 |
| Elongation after fracture (%) | 14 | 13.5 | 14 | 14.5 | 14 | 13.5 |
| The contraction percentage of area (%) | 58 | 54 | 57 | 59 | 57 | 57 |
As can be seen that the case depth of gear teeth face is deeper, and the center portion good mechanical properties of gear are required, had
Excellent case hardness, wear-resisting property and anti-overload ability.
Claims (8)
1. a kind of carburization quenching method of large excavator gear, it is characterised in that：Include the following steps,
(1), heat up samming step, first gear is placed in carburizer and is heated to 750 ± 10 DEG C, keeps the temperature 3-4h；
(2), step, carburizer heating are oozed by force, gear, to 960-980 DEG C, carburizer carburizing is passed through into carburizer with stove heat,
Carbon potential CP is controlled in 1.30 ± 0.05C%, maintains one section of carburizing time tIt oozes by force；
(3), diffusing step, carburizer heating, with stove heat to 1040-1060 DEG C, into carburizer be passed through carburizer oozes gear
Carbon controls carbon potential CP as 0.90 ± 0.05C%, and diffusion time tDiffusionIt is carburizing time t when oozing by forceIt oozes by force1.5 times；Wherein, institute
The strong carburizing time t oozed in step statedIt oozes by forceWith the diffusion time t in diffusing stepDiffusionThe sum of be total carburizing time tCarburizing, and it is total
Carburizing time tCarburizing=(δ/K)2, wherein δ is depth of penetration (mm), and K is carburizing temperature coefficient；
(4), cool down samming step, reduce furnace temperature, and gear is down to 840 ± 10 DEG C with stove, carburizer is passed through into carburizer and is oozed
Carbon maintains carbon potential CP in stove and to keep the temperature 2-3h in 0.90 ± 0.05C% in temperature-fall period；
(5) 840 ± 10 DEG C of gear is carried out oil quenching, and quenches oil temperature at 65-95 DEG C by, primary quenching step；
(6) quenched gear for the first time is heated to 650 ± 10 DEG C, heat preservation 3-4h by, isothermal spheroidizing step in stove；Again
Gear heating is heated to 720 ± 10 DEG C, heat preservation 3-4h；Gear is then cooled to 650 ± 10 DEG C, heat preservation 5-6h；Last tooth
Wheel cools to 550 DEG C with the furnace, comes out of the stove and is air-cooled to room temperature；
(7) the gear after isothermal spheroidizing is heated to 760 ± 10 DEG C, heat preservation 3-4h by, secondary quenching step in stove；
Gear is warming up to 820 ± 10 DEG C, heat preservation 2-3h with stove again；Then oil quenching will be carried out in 820 ± 10 DEG C of gear, and will quench oil temperature
Degree is 65-95 DEG C；
(8), lonneal step, gear is placed in tempering furnace and is heated to 180-260 DEG C of progress lonneal, and soaking time is
3-4h；Then it comes out of the stove and is air-cooled to room temperature.
2. the carburization quenching method of large excavator gear according to claim 1, it is characterised in that：It is described to ooze step by force
In carburizing time tIt oozes by forceIn 8-10h.
3. the carburization quenching method of large excavator gear according to claim 1, it is characterised in that：The diffusion step
In rapid, diffusion time tDiffusionIn 12-15h.
4. the carburization quenching method of large excavator gear according to claim 1, it is characterised in that：The first time quenches
It further include cleaning step between fiery step and isothermal spheroidizing step and between second of quenching Step and lonneal step
Suddenly, cleaning removal gear component surface oil stain, the temperature of cleaning solution is controlled at 50-60 DEG C when cleaning.
5. the carburization quenching method of large excavator gear according to claim 1, it is characterised in that：It is described to ooze step by force
Suddenly, diffusing step and cooling samming step in, the carburizer used is methanol, ethane, propane, ethyl alcohol, propyl alcohol, ethyl acetate
Any one or more.
6. the carburization quenching method of large excavator gear according to claim 1, it is characterised in that：It is described to ooze step by force
Suddenly, in diffusing step and cooling samming step, the carbon potential is controlled by adjusting carburizing agent flux.
7. the carburization quenching method of large excavator gear according to claim 1, it is characterised in that：The low temperature returns
In fiery step, the number of lonneal is twice.
8. the carburization quenching method of large excavator gear according to claim 1, it is characterised in that：The large-scale excavation
Machine gear steel material is 18Cr2Ni4WA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611141404.8A CN106756755B (en) | 2016-12-12 | 2016-12-12 | The carburization quenching method of large excavator gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611141404.8A CN106756755B (en) | 2016-12-12 | 2016-12-12 | The carburization quenching method of large excavator gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106756755A CN106756755A (en) | 2017-05-31 |
| CN106756755B true CN106756755B (en) | 2018-10-02 |
Family
ID=58880489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611141404.8A Active CN106756755B (en) | 2016-12-12 | 2016-12-12 | The carburization quenching method of large excavator gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106756755B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6812948B2 (en) * | 2017-10-30 | 2021-01-13 | 株式会社デンソー | Carburizing method |
| CN107893152A (en) * | 2017-12-29 | 2018-04-10 | 兴化东华齿轮有限公司 | A kind of heat treatment method of 17CrNiMo6 materials central gear |
| JP2019218583A (en) * | 2018-06-18 | 2019-12-26 | 株式会社小松製作所 | Manufacturing method of mechanical component |
| CN108866309B (en) * | 2018-07-23 | 2020-07-07 | 台州市众达热处理有限公司 | Gear piece separating device and heat treatment process thereof |
| CN109280851A (en) * | 2018-10-29 | 2019-01-29 | 西宁特殊钢股份有限公司 | Harmonic speed reducer special steel material flexbile gear and its cycle heat treatment method |
| CN109652630A (en) * | 2018-12-29 | 2019-04-19 | 山东蒙沃变速器有限公司 | A kind of processing technology of speed changer welded gear |
| CN112662988A (en) * | 2020-11-19 | 2021-04-16 | 广州市机电工业研究所 | Carburizing and infiltration accelerating process for alloy steel |
| CN112695269B (en) * | 2020-11-30 | 2022-09-27 | 山西平阳重工机械有限责任公司 | Heat treatment process of 18Cr2Ni4WA workpiece |
| CN113549866A (en) * | 2021-07-22 | 2021-10-26 | 湖南南方宇航高精传动有限公司 | Carburizing and quenching process for planet wheel of gear box roller path of wind generating set |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141333A (en) * | 1982-02-16 | 1983-08-22 | Daido Steel Co Ltd | Heat treatment of forging |
| CN103119188A (en) * | 2011-02-10 | 2013-05-22 | 新日铁住金株式会社 | Steel for carburizing, carburized steel component, and method for producing same |
| CN104711401A (en) * | 2015-02-09 | 2015-06-17 | 南车戚墅堰机车车辆工艺研究所有限公司 | Carburizing and quenching method for large heavy-duty gear |
| CN105238911A (en) * | 2015-11-16 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Steel grain refining heat treatment method for heavy-load locomotive gear |
| CN105239034A (en) * | 2015-11-16 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Impregnation and repair heat treatment method for carburized gear |
| CN105695921A (en) * | 2014-11-26 | 2016-06-22 | 重庆市巴南区永兴机械厂 | Carburization process for large heavy-duty gear |
-
2016
- 2016-12-12 CN CN201611141404.8A patent/CN106756755B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141333A (en) * | 1982-02-16 | 1983-08-22 | Daido Steel Co Ltd | Heat treatment of forging |
| CN103119188A (en) * | 2011-02-10 | 2013-05-22 | 新日铁住金株式会社 | Steel for carburizing, carburized steel component, and method for producing same |
| CN105695921A (en) * | 2014-11-26 | 2016-06-22 | 重庆市巴南区永兴机械厂 | Carburization process for large heavy-duty gear |
| CN104711401A (en) * | 2015-02-09 | 2015-06-17 | 南车戚墅堰机车车辆工艺研究所有限公司 | Carburizing and quenching method for large heavy-duty gear |
| CN105238911A (en) * | 2015-11-16 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Steel grain refining heat treatment method for heavy-load locomotive gear |
| CN105239034A (en) * | 2015-11-16 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Impregnation and repair heat treatment method for carburized gear |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106756755A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106756755B (en) | The carburization quenching method of large excavator gear | |
| CN104711401B (en) | Large heavy-load gear carburization quenching method | |
| CN106756753B (en) | The carburization quenching method of low-speed heavy-loaded gear | |
| CN100503893C (en) | Process for producing gear with hard bainite structure on surface | |
| CN103266212B (en) | Thermal treatment technology for improving low-temperature impact toughness of 25Cr2Ni4MoV steel forging | |
| CN102534134B (en) | Bainite isothermal quenching thermal treatment process method for medium-carbon bearing steel | |
| CN104630791B (en) | The multisection type Deep Carburization Process method of large heavy-load gear | |
| CN100570006C (en) | The 20CrMnMo energy-saving carburizing composite heat treating process | |
| US20050103777A1 (en) | Gear part and method of producing thereof | |
| CN105349940B (en) | Hot forging identifies the carburizing carbo-nitriding composite heat treating method of mould steel | |
| CN108103275B (en) | A kind of processing method of wear-resistant liner steel alloy | |
| CN105506249A (en) | Heat treatment method for high-nitrogen corrosion resistant plastic die steel | |
| CN103132086A (en) | Novel carburizing-constant temperature-quenching process for heavy-duty gears | |
| CN109609848A (en) | High tough antifatigue nano-scaled precipitate enhancing Ma-Austria's Multiphase Steel and preparation method thereof | |
| CN104562048A (en) | Heat treatment process for En40B type rock drilling tool shank | |
| CN102899469B (en) | Heat-treatment method of high-chromium wear-resistant white cast iron Cr28 | |
| CN102181613B (en) | Heat treatment method for large-scale Cr12Mov workpiece | |
| CN103103435A (en) | Preparation technology for nodular cast iron with TRIP (transformation-induced plasticity) effect | |
| Wang et al. | Mechanism of grinding-induced burns and cracks in 20CrMnTi steel gear | |
| CN107345267A (en) | A kind of high-performance TBM disk cutter Technologies for Heating Processing | |
| CN103103320A (en) | Method for improving low temperature impact toughness of 40CrNiMoA material | |
| CN108866300B (en) | Heat treatment process of breaking hammer | |
| CN103667615A (en) | Thermal treatment method of 42CrMo workpiece | |
| CN107904506B (en) | A kind of wear-resistant liner steel alloy | |
| JP2011219846A (en) | Method for manufacturing machine structural member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |