CN104060081B - Prevent the method that carburized gears heat treatment deformation is overproof - Google Patents
Prevent the method that carburized gears heat treatment deformation is overproof Download PDFInfo
- Publication number
- CN104060081B CN104060081B CN201410324174.3A CN201410324174A CN104060081B CN 104060081 B CN104060081 B CN 104060081B CN 201410324174 A CN201410324174 A CN 201410324174A CN 104060081 B CN104060081 B CN 104060081B
- Authority
- CN
- China
- Prior art keywords
- steel
- isothermal
- formula
- normalizing
- temperature
- 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
Landscapes
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The present invention relates to a kind of method preventing carburized gears heat treatment deformation overproof, belong to technical field of heat treatment, it is mainly characterized by the microscopic structure from controlled forge process wheel blank, in steel, the factor such as content of actual component is on the microscopic structure after steel normalizing and mechanical property difference and the impact of inhomogeneities, treatment process for isothermal normalizing is used to make the steel with different quenching degree all can obtain identical microscopic structure and the mechanical property having good uniformity, the Novel isothermal normalizing that the present invention proposes, isothermal truly can be realized by adjusting parameters, can obtain identical, stable, uniform microscopic structure and mechanical property.Under identical machining condition, it is thus achieved that identical and stable internal stress distribution, thus keep little and stable carburizing heat treatment deformation, make deformation overproof rate reduce by 10%.The present invention is the workpiece to same heat (batch) number, and all formula and technique are built upon being smelted the alloying component of the provided steel of rear line by steel mill.
Description
Technical field
The present invention relates to a kind of method preventing carburized gears heat treatment deformation overproof, belong to technical field of heat treatment.
Background technology
Carburized gears is the part that vehicle transmission mechanism is particularly important.It is at work except requiring punching pressure, wear-resisting, resistance to
Hit, outside plasticity_resistant deformation, counter-bending fatigue and surface contact fatigue, form and dimensional precision also had strict requirements.Cause
Directly affect transmission accuracy for the latter, operate steadily and the size of noise.The accuracy of gear is the highest, face is bad, both can draw
Play high noise, flank of tooth premature wear can be increased again.
Gear heat treatment deformation (distortion) is the concentrated expression reducing gear manufacture precision.Affect the factor of gear shifting quadrant texturing very
Many, and the impact interactively with each other of many of which factor.Although modern enterprise produces gear and has fixed (control) many impacts
The factor of deformation, but deform overproof (overproof deformation) and happen occasionally, sometime up to 35%, even up to 50%, and because of not
Allow correction, cause massive losses, become the difficult problem in gear manufacture.The auto manufacturing of the state such as American-European, Japanese is generally recognized
For, the topmost effective measures reducing carburized gears deformation are to use H steel.So-called H steel refers to that the Jominy end-quench curves of steel is being specified
End quenching distance must have technically demanding hardness, and hardness number fluctuation is the least.First this kind of steel is marked for U.S. SAE
Quasi-ization processes, and adds " H " and represent, because of referred to herein as H steel after grade of steel.As a example by carburizing steel, such as 4620H, 8620H etc..Hereafter, day
This lists H steel in, such as SCM22H, SNC21H etc. in JIS standard.Although some country does not has H to indicate, but increases carburizing steel yet
Strict quenching degree requirement.J such as Germany's 20MnCr5 steel10(i.e. Jominy end-quench curves hardness at the end 10mm that quenches exists=33-39
Between HRC33-39, the width of Jominy end-quench curves band is 7HRC).It was verified that use H steel batch production gear to truly have at reduction heat
The effect of reason deformation, and Jominy end-quench curves band the narrowest (hardness number fluctuation is the least) deformation is the least.In Japan, also there are some well-known enterprises
The gear of the H steel making reputable brand car that industry uses width to be 3HRC.Why H steel can reduce gear heat treatment deformation,
It is owing to it has stable quenching degree characteristic, is readily available identical microscopic structure and close hardness after causing normalizing, cuts
Cutting forming residual stress stable, heat treatment deformation is stable.Such that it is able to by deformation allowance, reduction is crumpled.Steel mill produces
Non-H steel, mainly controls the alloying element in steel and impurity content, for single factors control, is easier, and metallurgical qualification rate can
Reach more than 95%.Production H steel, in addition to composition control, also to control specifying end quenching quench away from the hardness number being had and reduce
Its undulatory property, i.e. to be affected by several factors, and implementation process is extremely difficult.Different heat (batch) number steel qualities is difficult to control to, i.e.
Making same heat (batch) number steel quality problems the most often occur, steel qualification rate is relatively low, and the most only about 50%.Therefore production cost increases
Height, 2 times of the most non-H steel.It is to say, the method that currently used H steel reduces gear heat treatment deformation, in reality
Production exists cost high, expensive problem.And, even with H steel, the instability of carburized gears is overproof also can be through
Often occur, and often fluctuate because of season, the change of grade of steel, become hard nut to crack.
The isothermal normalizing technique used now is to be fitted together by workpiece used, is heated to a temperature, then dries
Cold.Workpiece is extremely difficult to identical temperature and rate of cooling, and therefore obtained tissue also differs.The most useless reach the most sincere justice
On isothermal normalizing, be the isothermal normalizing of "false".
Summary of the invention
It is an object of the invention on the premise of ensureing performance requirement, for Present Domestic, outer enterprise produces automobile carburizing tooth
Take turns the shape that the heat treatment deformation overproof rate being widely present is excessive, unstable, it is provided that one prevents carburized gears heat treatment deformation
Overproof method, stably obtains the good microscopic structure of machinability and mechanical property, changes and price can only be used at present high, tight
Lattice control the present situation of the H steel making carburized gears of quenching degree, are conducive to can substitute for the use of H steel in actual production, use valency
The relatively low non-H steel of lattice produces less or without heat treatment deformation automobile gear.
It is an object of the invention to be achieved through the following technical solutions, a kind of prevent carburized gears heat treatment deformation overproof
Method, is characterized in that, described method is to combine the component content of carburized gears to be heated, distribution consistency degree, crystal grain
The each correlative factor of size, effective thickness on the microscopic structure after steel normalizing and mechanical property difference and the impact of inhomogeneities, from
Minimum cooling temperature before the longest cool time, gear isothermal before austenitizing heating-up temperature, austenitizing holding time, gear isothermal
Degree, isothermal normalizing treatment temperature, isothermal normalizing temperature retention time each technological parameter aspect carry out science and engineering at the isothermal normalizing of personalization
Skill, thus stably obtain microscopic structure and the mechanical property that technology requires.
Present invention microscopic structure from controlled forge process wheel blank, in steel, the factor such as content of actual component is to steel just
Microscopic structure after fire and mechanical property difference and the impact of inhomogeneities, use treatment process for isothermal normalizing to make have difference and quench
The steel of property all can obtain identical microscopic structure and the mechanical property having good uniformity thoroughly, and the Novel isothermal that the present invention proposes is just
Fire, can realize isothermal truly by adjusting parameters, can obtain identical, stable, the most micro-
Microstructure and mechanical property.Under identical machining condition, it is thus achieved that identical and stable internal stress distribution, thus keep little and steady
Fixed carburizing heat treatment deformation, makes deformation overproof rate reduce by 10%.The present invention is the workpiece to same heat (batch) number, all formula and technique
It is built upon being smelted the alloying component of the provided steel of rear line by steel mill.
Accompanying drawing explanation
Fig. 1 is the influence factor of carburizing steel gear heat treatment deformation；
Fig. 2 is the CCT figure of three kinds of SCM22 steel and the cooling curve that thickness is 100mm steel part normalizing air cooling；
Fig. 3 is automobile carburized gears isothermal normalizing computer expert system program；
Fig. 4 is Supercooled Austenite Isothermal Transformation Diagram and the Isothermal Treatment of three kinds of SCM22 steel.
Detailed description of the invention
Further illustrating the present invention, our early-stage Study draws in conjunction with the embodiments: the deformation of carburizing steel gear heat treatment
Influence factor have design, forging, by 8 aspects such as steel, machine add 60 more than, as shown in Figure 1.Under the conditions of modern production, permitted
The multifactor control that takeed effective measures so that it is impact is fixing.H steel can be reduced the research table of gear heat treatment Deformation Reasons
Bright, owing to the product of this kind of steel can obtain identical microscopic structure and the power of close applicable machining after normalized treatment
Learn performance, make cutting residual stress during machining less and stable and consistent, so that the deformation after gear carburizing quenching is relatively
Little and stable, it is simple to take measures, be compensated by and correct.
Carburizing steel beneficially machining and to produce compared with the microscopic structure of low residual stress be the thicker free iron of crystal grain
Ferritic (F) adds fine pearlite (P), should not have bainite (B), martensite (M), and its hardness is between HB160-180.In reality
Border produce in, even if use H steel reduce heat treatment deformation, generally also can because of the fluctuation in the reasonable scope of its chemical composition,
And cause the change of performance, cause the increase of product disqualification rate.
As a example by Japan's SCM22 (being equivalent to China 20CrMnMo) steel, standard specifies that its chemical analysis is for (wt%):
0.17-0.23C, 0.15-0.17Si, 0.55-0.9Mn, 0.85-1.35Cr, 0.15-0.35Mo, other alloying element (Ni, Cu
Deng)≤0.35.The overcooling austenite continuous cooling transformation of three kinds of different components (all within standard specifies composition) of this grade of steel is bent
Line (CCT figure) is as shown in Figure 2.Steel part effective thickness (including that steel part compact reactor puts effective thickness) is 100mm, and air cooling is (the most just
Fire cooling) curve is also shown in figure.After the main chemical of three kinds of steel and normalizing, hardness is as follows:
1 (dotted line): 0.17C, 0.56Mn, 0.85Cr, 0.16Mo (wt%)；HB140-150.
2 (solid lines): 0.20C, 0.72Mn, 1.01Cr, 0.27Mo (wt%)；HB170-180.
3 (chain-dotted lines): 0.23C, 0.90Mn, 1.25Cr, 0.35Mo (wt%)；HB180-210.
It can be seen that No. 2 steelworks that quenching degree is moderate, that obtain after normalizing is F+P, and hardness also complies with technology requirement.1
Although a number steelwork is F+P, but hardness is too low, defective.No. 3 steelworks are F+P+B, and much higher hard is the most defective.Defective
Its machining of steel part after residual stress big, heat treatment deformation is also big, and can destroy normal deformation rule.Thus illustrate
The stability of steel (including H steel) quenching degree is extremely important to actual production.
The present invention according to factors such as component content, distribution consistency degree, grain sizes in actual product steel to normalizing
The microscopic structure of rear steel and mechanical property difference and the impact of inhomogeneities, and by the strict microscopic structure controlling forging stock, make
They all have identical statenchyma (prevent normalizing from heating Structure Inheritance and cause mixed crystal) and use isothermal processes (supercool Austria
Family name's body decomposes under constant temperature), even if the quenching degree of steel is different, each product all can obtain identical microscopic structure and mechanics
Performance.Acquisition microscopic structure is F+P (ferrite adds pearlite), and hardness is HB160-180, and can be by adjusting isothermal temperature
Degree adjusts the hardness of steel part.It is as follows that it is embodied as step:
The first step: regulation Gear Forging Stock cooling after forged express delivery≤100 DEG C/h.Inspecting its microscopic structure by random samples is pro-eutectoid ferrite
(F) fine pearlite (P), bainite (B) and martensite (M) content≤5% are added.
Second step: detection or the chemical analysis (wt%) of cognitive product reality steel, including C, Mn, Si, Cr, Ni, Mo, V,
Ti、Al。
3rd step: the banded structure rank (grading by national standard) of detection steel.
4th step: determine the effective thickness (determining by engineering traditional method) of gear, thus obtain identical isothermal normalizing and add
The grain size of austenite and the uniformity after heat.
5th step: collecting the main performance index required by wheel blank normalizing (with the required hardness number reached is generally
Leading indicator)
6th step: utilize specialist system to calculate and determine the main points parameter of isothermal normalizing technique:
1) austenitizing temperature (TA), austenitizing temperature is determined by formula (1),
TA(DEG C)=a0-320C-b0Ni-c0Cu-d0Mn+e0W+f0Mo+g0Cr+h0Si+i0(V+Nb+Zr+Ti)+80～120
(1)
Wherein, a0=900～930, b0=8～12, c0=10～14, d0=12～16, e0=5～8, f0=10-16, g0
=3～6, h0=15～20, i0=30～50, C are phosphorus content, and alloying element symbol represents the constituent content of this element, following phase
With.
2) austenitizing holding time (tA)
tA(min)=a × H (2)
In formula, a is constant, is 10-15 for alloy carburizing steel；H is effective thickness (mm).Effective thickness refers to make
Each product heart portion is attained by requiring the minimum dimension of temperature.The shaft-like diameter that is often referred to of single placement, tabular is often referred to thickness.
The effective thickness method typically determined by factory's steel part heat treatment heating, cooling determines.
3) (t the longest cool time before gear isothermals), this parameter can be determined by formula (3).
Logt (s)=(0.45-C)+a1Mo+b1(V+Ti+Nb+Zr)+c1W+d1Cr+e1Mn+f1Ni+g1Si+h1B*
(3)
In formula, a1=2.5～4.0, b1=1.8～2.6, c1=1.0～1.8, d1=0.8～1.6, e1=0.5～1.2,
f1=0.15～0.35, g1=0.10～0.30, h1=0.6～1.2, B*For Boron contents, span is 0.001-0.005%.
4) minimum chilling temperature (T before gear isothermalmin), this parameter can be determined by formula (4).
Tmin(DEG C)=a2-b2Mn-c2(V+Ti+Nb+Zr)-d2Si-e2Cr-f2Mo-g2Ni-h2W
(4)
In formula, a2=600～680, b2=30～45, c2=35～50, d2=35～50, e2=20～35, f2=15～
30, g2=10～25, h2=8～20.
5) isothermal normalizing treatment temperature (Tiso), this parameter can be determined by formula (5).
Tiso(DEG C)=[a3-b3Ni-c3Cu+d3Mn+e3Cr+f3Si-g3(V+Ti+Nb+Zr)-h3-[HB-(i3+j3C+
k3Al+l3(V+Ti+Nb+Zr)+m3Si+n3Cu+o3Mn+p3Mo+q3Ni+r3Cu+s3W)]/t3(C-0.1) (5)
In formula, a3=700～750, b3=10～18, c3=14～22, d3=12～20, e3=15～25, f3=25～
40, g3=30～55, h3=10～25, i3=36～67, j3=80～130, k3=40～60, l3=40～60, m3=35～
55, n3=18～35, o3=25～35, p3=30～40, q3=30～40, r3=8～20, s3=9～19, t3=1～2.5,
HB is that technology requires hardness number.
6) isothermal normalizing temperature retention time (tiso), tiso(min)≥(tm/ 60)+1.5H (H is effective thickness)
tsCan be determined by formula (6).
logtm(s)=[a4C+b4(V+Ti+Nb+Zr)+c4Mo+d4Cr+e4Mn+f4W+g4Ni+h4Si]+i4 (6)
In formula, a4=1.8～3.8, b4=2～4, c4=0.5～0.8, d4=0.2～09.4, e4=0.25～0.45, f4
=0.15～0.35, g4=0.16～0.26, h4=0.12～0.18, i4=1.5～2.5.
7th step: the parameter value calculated according to above-mentioned formula, according to actual heat treatment equipment, completes isothermal normalizing technique
Process.(also the numerical value that first five walks can be directly inputted in specialist system as shown in Figure 3, obtain corresponding parameter value)
8th step: verify and adjust.If the hardness number of such as steel part is on the low side, then can be allowed to reduce by adjusting isothermal temperature
Improve the hardness number of steel part.Must be pointed out, although current industrial many enterprises all use isothermal normalizing technique, but owing to not having
There are its essence implication of grasp and control technology, substantially belong to " false isothermal ".I.e. steel part and same charging basket steel part are all continuous colds
But change under temperature match curing conditions, and each steel part is the most variant.Therefore, even if using H steel, after process, steel part is aobvious
Micro-assembly robot and hardness also have the technology that do not meets to require, the overproof ratio of heat treatment deformation is the highest.
Embodiment 1:
During 20MnCr steel-tooth wheel blank uses the isothermal normalizing that common normalizing or non-critical control, add hot and cold because of in heaps
But (air cooling after air cooling or isothermal), the actual rate of cooling of part being in different parts is different, it is thus achieved that microscopic structure incomplete
Identical, the internal stress size of machining, difference is distributed, the deformation that carburizing and quenching causes also differs, and some part occurs
Deform overproof.After using present invention process, owing to each part can be made to obtain identical microscopic structure and performance, cutting stress
State is identical, and deformation rule is stable.
Embodiment 2:
8620 steel-tooth wheel blanks use the isothermal normalizing that common normalizing or non-critical control at present.Because this steel hardenability is relatively low,
After normalizing, hardness low (requiring less than technology), prolongs plasticity height, and machinability is poor, and internal stress is big, and carburizing and quenching deformation overproof rate is the highest
(more than 35%), becomes the difficult problem in domestic gear manufacture.The present invention can make this steel base obtain required by microscopic structure and
Hardness, so that this product deformation overproof rate is less than 5%.
Embodiment 3:
As a example by the SCM22 steel of three kinds of different components as provided in Fig. 2, as front analysis is learnt, although this kind of H steel
Chemical analysis fluctuates in allowed limits, but owing to causing the stability change of hardenability of steel, by common normalizing process
After process, microscopic structure and the hardness of three kinds of steel are different, substandard product occur.Eight steps provided according to the present invention
Suddenly, the final hardness of obtained steel is HB160-180, and microscopic structure is (F+P).Even if it is to say, the quenching degree of steel
Different (chemical analysis is different), use the isothermal normalizing technique of the present invention, and each steel part can obtain identical microscopic structure and power
Learning performance, cutting internal stress is little and the regularity of distribution stable, and carburizing and quenching deformation is little, stable.
Claims (1)
1. preventing the method that carburized gears heat treatment deformation is overproof, it is characterized in that, described method combines to be heated
Micro-to after steel normalizing of each correlative factor of the component content of carburized gears, distribution consistency degree, grain size, effective thickness
Microstructure and mechanical property difference and the impact of inhomogeneities, from austenitizing heating-up temperature, austenitizing holding time, gear etc.
Minimum chilling temperature, isothermal normalizing treatment temperature, each work of isothermal normalizing temperature retention time before the longest cool time, gear isothermal before temperature
Skill parameter aspect carries out the treatment process for isothermal normalizing of personalization, thus stably obtains microscopic structure and the mechanical property that technology requires
Energy；Described treatment process for isothermal normalizing comprises the steps:
The first step: regulation Gear Forging Stock cooling after forged speed≤100 DEG C/h, inspecting its microscopic structure by random samples is pro-eutectoid ferrite (F)
Add fine pearlite (P), bainite (B) and martensite (M) content≤5%；
Second step: by the detection of its percentage by weight or the chemical analysis of cognitive product reality steel, including C, Mn, Si, Cr, Ni,
Mo、V、Ti、Al；
3rd step: by the banded structure rank of national standard detection steel；
4th step: determine the effective thickness of gear, thus after obtaining the heating of identical isothermal normalizing, the grain size of austenite is with equal
Evenness；
5th step: collect the main performance index required by wheel blank normalizing, with the required hardness number reached as leading indicator；
6th step: utilize specialist system to calculate and determine the main points parameter of isothermal normalizing technique:
1) austenitizing temperature TA, unit is DEG C, formula (1) determine,
TA=a0-320C-b0Ni-c0Cu-d0Mn+e0W+f0Mo+g0Cr+h0Si+i0(V+Nb+Zr+Ti)+(80～120) (1)
Wherein, a0=900～930, b0=8～12, c0=10～14, d0=12～16, e0=5～8, f0=10-16, g0=3～
6, h0=15～20, i0=30～50, C are phosphorus content, and alloying element symbol represents the constituent content of this element, the most identical；
2) austenitizing holding time tA, unit is min, formula (2) determine,
tA=a × H (2)
In formula, a is constant, is 10-15 for alloy carburizing steel；H is effective thickness, and unit is mm, and effective thickness refers to permissible
Making each product heart portion be attained by requiring the minimum dimension of temperature, single placement acropachy diameter, tabular dinger thickness degree, by factory
The effective thickness method that the heating of steel part heat treatment, cooling determine determines；3) t the longest cool time before gear isothermals, unit is
Min, is determined by formula (3)；
logts=(0.45-C)+a1Mo+b1(V+Ti+Nb+Zr)+c1W+d1Cr+e1Mn+f1Ni+g1Si+h1B* (3)
In formula, a1=2.5～4.0, b1=1.8～2.6, c1=1.0～1.8, d1=0.8～1.6, e1=0.5～1.2, f1=
0.15～0.35, g1=0.10～0.30, h1=0.6～1.2, B* are Boron contents, and span is 0.001-0.005%；
4) minimum chilling temperature T before gear isothermalmin, unit is DEG C, formula (4) determine,
Tmin=a2-b2Mn-c2(V+Ti+Nb+Zr)-d2Si-e2Cr-f2Mo-g2Ni-h2W (4)
In formula, a2=600～680, b2=30～45, c2=35～50, d2=35～50, e2=20～35, f2=15～30, g2
=10～25, h2=8～20；
5) isothermal normalizing treatment temperature Tiso, unit is DEG C, formula (5) determine,
Tiso=[a3-b3Ni-c3Cu+d3Mn+e3Cr+f3Si-g3(V+Ti+Nb+Zr)-h3-[HB-(i3+j3C+k3Al+l3(V+Ti+
Nb+Zr)+m3Si+n3Cu+o3Mn+p3Mo+q3Ni+r3Cu+s3W)]/t3(C-0.1) (5)
In formula, a3=700～750, b3=10～18, c3=14～22, d3=12～20, e3=15～25, f3=25～40, g3
=30～55, h3=10～25, i3=36～67, j3=80～130, k3=40～60, l3=40～60, m3=35～55, n3
=18～35, o3=25～35, p3=30～40, q3=30～40, r3=8～20, s3=9～19, t3=1～2.5, HB are skill
Art requires hardness number；
6) isothermal normalizing temperature retention time tiso, unit is min, tiso≥(tm/ 60)+1.5H, wherein H is effective thickness, and unit is
Mm, tmUnit is s, formula (6) determine
logtm=[a4C+b4(V+Ti+Nb+Zr)+c4Mo+d4Cr+e4Mn+f4W+g4Ni+h4Si]+i4 (6)
In formula, a4=1.8～3.8, b4=2～4, c4=0.5～0.8, d4=0.2～09.4, e4=0.25～0.45, f4=
0.15～0.35, g4=0.16～0.26, h4=0.12～0.18, i4=1.5～2.5；
7th step: the parameter value calculated according to above-mentioned formula, according to actual heat treatment equipment, completes at isothermal normalizing technique
Reason；
8th step: verify and adjust, if the hardness number of steel part is on the low side, then can be allowed to reduce by adjustment isothermal temperature and improve
The hardness number of steel part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410324174.3A CN104060081B (en) | 2014-07-05 | 2014-07-05 | Prevent the method that carburized gears heat treatment deformation is overproof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410324174.3A CN104060081B (en) | 2014-07-05 | 2014-07-05 | Prevent the method that carburized gears heat treatment deformation is overproof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104060081A CN104060081A (en) | 2014-09-24 |
| CN104060081B true CN104060081B (en) | 2016-09-28 |
Family
ID=51548010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410324174.3A Active CN104060081B (en) | 2014-07-05 | 2014-07-05 | Prevent the method that carburized gears heat treatment deformation is overproof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104060081B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498696B (en) * | 2014-12-15 | 2016-09-21 | 中国南方航空工业(集团)有限公司 | The heat treatment method of tooth class part |
| CN107739807B (en) * | 2017-09-28 | 2019-05-14 | 刘澄 | A kind of continuous heat processing method of accurate control alloy carburizing steel part pretreatment microscopic structure |
| CN107858492B (en) * | 2017-10-25 | 2019-02-15 | 刘澄 | Change the alloy carburizing steel preprocess method of netted acicular ferrite in microscopic structure |
| CN110263406B (en) * | 2019-06-13 | 2022-12-06 | 湖南大学 | Heat treatment method and optimization method for ultra-large module gear under low-speed heavy load |
| CN110484858B (en) * | 2019-08-29 | 2021-08-20 | 汉德车桥(株洲)齿轮有限公司 | Method for eliminating mixed crystal of gear steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257132A (en) * | 1999-12-16 | 2000-06-21 | 贵州工业大学 | Stentor cemented steel for gear and thermal working technology |
-
2014
- 2014-07-05 CN CN201410324174.3A patent/CN104060081B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257132A (en) * | 1999-12-16 | 2000-06-21 | 贵州工业大学 | Stentor cemented steel for gear and thermal working technology |
Non-Patent Citations (4)
| Title |
|---|
| 20CrMoH钢汽车渗碳齿轮件等温正火前冷却速度的控制研究;季长涛等;《金属热处理》;20071231;第32卷(第7期);第65-67页 * |
| 从渗碳齿轮钢锻坯的正火处理探讨正火标准;刘云旭等;《金属热处理》;20081231;第33卷(第3期);第108-111页 * |
| 正火-影响渗碳齿轮热处理畸变的一个重要因素;刘云旭等;《金属热处理》;20051231;第30卷(第3期);第46-48页 * |
| 汽车渗碳齿轮毛坯等温正火工艺的探讨;李佐锋;《机械制造与研究》;20070831;第36卷(第4期);第45-47页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104060081A (en) | 2014-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104060081B (en) | Prevent the method that carburized gears heat treatment deformation is overproof | |
| JP5126857B2 (en) | Manufacturing method of case-hardened steel pipe with excellent workability | |
| CN105154774A (en) | Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof | |
| CN103154293A (en) | Carburizing steel having excellent cold forgeability, and production method thereof | |
| CN103124801A (en) | Case hardened steel and method for producing same | |
| JP6109729B2 (en) | Case-hardened steel with excellent grain coarsening prevention characteristics during carburizing | |
| CN104120341A (en) | Cr5 steel forging work roll for rolling extremely thin materials and preparation method thereof | |
| CN104024444A (en) | Method for producing steel part | |
| CN104302799B (en) | Case-carbonizing steel steel | |
| CN107371369B (en) | The component and manufacturing method with bainite structure with high-strength characteristic | |
| CN113718174A (en) | Double-refined high-strength-toughness long-life medium-high carbon bearing steel and preparation method thereof | |
| CN106350648A (en) | Gear steel 20CrMnTiH isothermal normalizing treatment method | |
| CN105945536A (en) | Forging technology of third gear for intermediate shaft of automobile gearbox | |
| CN107475623A (en) | A kind of hot forming high-strength steel and its processing method | |
| CN102286655A (en) | Device and method for isothermal normalizing utilizing forging waste heat | |
| US20180245172A1 (en) | Age-hardenable steel, and method for manufacturing components using age-hardenable steel | |
| CN104646422B (en) | Intermediate roll of multi-roll mill and manufacturing method thereof | |
| JP4919338B2 (en) | Manufacturing method of steel parts having excellent fatigue strength and steel parts | |
| CN202246747U (en) | Excess heat isothermal normalizing furnace | |
| CN103352173A (en) | Preheat treatment method for 18CrNiMo7-6 alloy steel forged pieces | |
| CN115449703B (en) | Isothermal annealing gear steel bar applicable to cold forging and manufacturing method thereof | |
| KR101557086B1 (en) | Method of ferrite pearlite annealing heat treatment before cold forging for automotive steel | |
| CN107674944B (en) | A kind of hardening and tempering method of splined shaft | |
| CN114150117B (en) | Method for remedying ribbon-shaped structure of ferrite-pearlite type non-quenched and tempered steel forging | |
| JP2016188421A (en) | Carburized component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Cheng Inventor after: Zhao Zhenbo Inventor after: Zhao Bin Inventor after: Zhang Qi Inventor before: Liu Cheng Inventor before: Zhao Zhenbo Inventor before: Zhao Bin |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LIU CHENG ZHAO ZHENBO ZHAO BIN TO: LIU CHENG ZHAO ZHENBO ZHAO BIN ZHANG QI |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |