CN109136477A - A kind of train connecting hook heat treatment process - Google Patents
A kind of train connecting hook heat treatment process Download PDFInfo
- Publication number
- CN109136477A CN109136477A CN201811097013.XA CN201811097013A CN109136477A CN 109136477 A CN109136477 A CN 109136477A CN 201811097013 A CN201811097013 A CN 201811097013A CN 109136477 A CN109136477 A CN 109136477A
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- China
- Prior art keywords
- connecting hook
- heat treatment
- temperature
- treatment process
- heating furnace
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- 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.)
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Classifications
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Abstract
The invention discloses a kind of train connecting hook heat treatment process, are related to heat treatment process field.The technique mainly includes heating period, 900-920 DEG C of carbon impregnation stage, 60-80 DEG C of fast oily cooling stage and 180-200 DEG C of lonneal stage, and wherein carbon impregnation stage includes strong infiltration, diffusion and heat preservation.The present invention has the following advantages and effects: by the way that the prolonged strong diffusion phase for seeping stage and high temperature is arranged, improve the harden ability of connecting hook, the surface and centre hardness for guaranteeing connecting hook reach requirement, improve it treated tension resistance ability, achieved the effect that high service life；Holding stage and the rapid oil type of cooling are added again, are avoided connecting hook that decarburization phenomenon occurs and are improved the harden ability of connecting hook, have further achieved the effect that high service life.
Description
Technical field
The present invention relates to heat treatment process field, in particular to a kind of train connecting hook heat treatment process.
Background technique
In material processing and equipment manufacture field, heat treatment, which is that one kind is common, carries out at reinforcing material surface and equipment
Reason, is allowed to a kind of technique for having various superperformances, wherein can increase substantially the rigidity, hard of workpiece by heat treatment
Degree, wearability, fatigue strength and toughness etc., to meet the different requirements of various machine components and tool.
Fixation is usually attached using connecting hook between two section compartments of train, is buffered when connecting hook is Train brake
Component, when work, will bear great impact force, therefore be easy to cause its harden ability poor using traditional heat treatment method, into
And the service life of connecting hook is considerably reduced, have much room for improvement.
Summary of the invention
The object of the present invention is to provide a kind of train connecting hook heat treatment process, have the effect of high service life.
At above-mentioned technical purpose of the invention has the technical scheme that a kind of train connecting hook is hot
Science and engineering skill, characterized by the following steps:
S1: connecting hook is placed in heating furnace by heating by heating furnace continuous heating to after 900-920 DEG C, keeps the temperature 30-
40min；
S2: carburizing includes the following steps:
S21: it is strong to seep, it remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keep the temperature 390-410min；
S22: diffusion remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keeps the temperature 190-210min；
S3: it is cooling, connecting hook is taken out out of heating furnace, it is cold to carry out oil to connecting hook, cooling time 25-35min；
S4: connecting hook after heating furnace is cooled to 180-200 DEG C, is put into heating furnace, keeps the temperature 170-190min by tempering.
By using above-mentioned technical proposal, by 900-920 DEG C and the long-time of 390-410min is kept to seep by force the stage, it is right
Connecting hook is seeped by force, and the carburizing effect on connecting hook surface is improved.Connecting hook is made to start to expand by 900-920 DEG C of high temperature again
It dissipates, improves the carburizing effect of connecting hook heart, and then ensure that the surface hardness of connecting hook and centre hardness reach hardness and want
It asks, improves the harden ability of connecting hook, improve it treated toughness and tension resistance ability, and then connection is greatly improved
The service life of hook has achieved the effect that high service life.
The further setting of the present invention are as follows: step S2 further includes following steps:
S23: heat preservation, continued down remain temperature-resistant, keep the temperature 25-35min to 830-850 DEG C.
By using above-mentioned technical proposal, by the way that holding stage is arranged, so that the carbon penetrated into connecting hook is fixed, improve
The stability of carburizing, and then avoid it that decarburization phenomenon occurs and influence the service life of connecting hook, further reach high use
The effect in service life.
The further setting of the present invention are as follows: in step S3, be quickly cooled down using 60-80 DEG C of quenching oil.
By using above-mentioned technical proposal, replaces the slow oil of traditional classification cooling by the way that rapid oil is cooling, improve connecting hook
Harden ability, and keep its layer depth more uniform, and the color on surface is more uniform full, and then increase connecting hook heat treatment
Service life afterwards.
The further setting of the present invention are as follows: the carbon potential CP in step S21 is 1.1 ± 0.05, and the carbon potential CP in step S22 is
Carbon potential CP in 0.8 ± 0.05, step S23 is 0.8 ± 0.05.
By using above-mentioned technical proposal, because the excessively high phosphorus content that will lead to connecting hook of carbon potential increases, phosphorus content increases
There is carbon black in the surface that will lead to connecting hook, so that connecting hook is more crisp, i.e., connecting hook is easy to happen fracture or damage.Carbon potential is too low
The phosphorus content that will lead to connecting hook reduces, and then reduces the bearing capacity on connecting hook surface, reduces the service life of connecting hook.Cause
This makes the carbon potential CP of the carbon impregnation stage of connecting hook be 1.1 ± 0.05,0.8 ± 0.05 and 0.8 by 900-920 DEG C of high temperature
± 0.05, so that the phosphorus content of connecting hook reaches requirement just, the longevity is used after further increasing connecting hook heat treatment
Life.
The further setting of the present invention are as follows: the heating temperature in step S21 is 910 DEG C, soaking time 400min.
By using above-mentioned technical proposal, because the temperature and soaking time in infiltration stage are the main of influence carbon potential by force
Factor, the excessively high phosphorus content that will lead to connecting hook of temperature and time increase, so that connecting hook is more crisp, and then reduce making for connecting hook
Use the service life.The too low phosphorus content that will will lead to connecting hook of temperature and time is not up to standard, while the carburizing that will lead to connecting hook is uneven
It is even, the hardness on connecting hook surface is thereby reduced, the service life of connecting hook can be equally reduced.Therefore the heating of 910 DEG C of setting
The soaking time of temperature and 400min, so that the phosphorus content on connecting hook surface reaches hardness standard, and then avoids under the state
Connecting hook after heat treatment is excessively crisp or excessively soft, the effective service life for increasing connecting hook.
The further setting of the present invention are as follows: the heating temperature in step S22 is 910 DEG C, soaking time 200min.
By using above-mentioned technical proposal, diffusion phase refers to that carbon penetrates into the center portion of connecting hook, because of the center portion of connecting hook
The phosphorus content of position will be lower than the phosphorus content on connecting hook surface, but the phosphorus content of connecting hook center portion again cannot be too low.Because even
Connect hook center portion phosphorus content it is too low to will lead to connecting hook center portion softer, and then cause to be easy to happen shape in connecting hook use process
Become；The phosphorus content of connecting hook center portion is excessively high and to will lead to connecting hook center portion more crisp, and then causes to be easy in connecting hook use process
It is broken.Therefore the heating temperature of 910 DEG C of setting and the soaking time of 200min, so that under the state, connecting hook center portion
Phosphorus content reach hardness standard, and then avoid the connecting hook after heat treatment deformation occurs or fracture, it is further effective to increase
The service life of connecting hook.
The further setting of the present invention are as follows: the heating temperature in step S23 is 840 DEG C, soaking time 30min.
By using above-mentioned technical proposal, because the heating temperature of connecting hook is excessively high or the residence time is too long at high temperature
When, it is easy to happen decarburization phenomenon, therefore heating temperature and soaking time are to influence the principal element of connecting hook decarburization, connecting hook
Decarburization is easy to make the phosphorus content on its surface layer to reduce, and martensite transfor mation cannot occur inside it, or transformation is not exclusively, is easy to lead
It cannot get required hardness after cause processing.Therefore the heating temperature of 8400 DEG C of setting and the soaking time of 30min, so that should
Under state, the generation of connecting hook decarburization phenomenon is reduced or prevents, and then increase the service life of connecting hook.
The further setting of the present invention are as follows: the material of connecting hook is 40Cr.
By using above-mentioned technical proposal, the tensile strength of 40Cr material, yield strength and harden ability are higher, and it has
There are higher fatigue strength and good toughness.And the machinability after being heat-treated is good, therefore using 40Cr material processing system
Connecting hook is made, the tensile strength, yield strength and harden ability of connecting hook are effectively raised, and then its use is greatly improved
Service life.
In conclusion the invention has the following advantages:
1. improving the harden ability of connecting hook by the prolonged strong diffusion phase for seeping stage and high temperature of setting, guaranteeing
The surface of connecting hook and centre hardness reach requirement, improve it treated tension resistance ability, reached high service life
Effect；
2. avoiding connecting hook that decarburization phenomenon, the company of further improving occurs by adding holding stage after diffusion phase
Connect the service life of hook；
3. replacing the slow oil of traditional classification cooling by the way that rapid oil is cooling, the harden ability of connecting hook is further increased, and
Keep its layer depth more uniform, further achievees the effect that high service life；
4. being increased substantially by selecting tensile strength, yield strength and the connecting hook of the higher 40Cr material of harden ability
Its tension and anti-pressure ability, and then it is greatly improved its service life.
Specific embodiment
A kind of train connecting hook heat treatment process, characterized by the following steps:
S1: the connecting hook of 40Cr material is placed in heating furnace by heating furnace continuous heating to after 900-920 DEG C by heating
It is interior, keep the temperature 30-40min；
Because the tensile strength of 40Cr material, yield strength and harden ability are higher, and its fatigue strength with higher
With good toughness, therefore the present embodiment is heat-treated using the connecting hook of 40Cr material, effectively raises connecting hook
Its service life is greatly improved in tensile strength.
S2: carburizing includes the following steps:
S21: it is strong to seep, it remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keep the temperature 390-410min,
Middle heating temperature is preferably 910 DEG C, and soaking time is preferably 400min；
S22: diffusion remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keeps the temperature 190-210min,
Middle heating temperature is preferably 910 DEG C, and soaking time is preferably 200min；
S23: heat preservation, continued down remain temperature-resistant, keep the temperature 25-35min, wherein heating temperature is excellent to 830-850 DEG C
840 DEG C are selected as, soaking time is preferably 30min；
Connecting hook is seeped by force by the long-time of 910 DEG C of high temperature and 400min, improves the infiltration on connecting hook surface
Carbon effect.Make connecting hook start to spread by 900-920 DEG C of high temperature again, improves the carburizing effect of connecting hook heart.Lead to again
Holding stage is crossed, so that the carbon penetrated into connecting hook is fixed, avoids it that decarburization phenomenon occurs, and then effectively raise connection
The harden ability of hook improves it treated toughness and tension resistance ability, improves the service life of connecting hook, reached height
The effect of service life；
Wherein, the carbon potential CP in step S21 is 1.1 ± 0.05, and the carbon potential CP in step S22 is 0.8 ± 0.05, step
Carbon potential CP in S23 is 0.8 ± 0.05；
Because the excessively high phosphorus content that will lead to connecting hook of carbon potential increases, the surface that phosphorus content increase will lead to connecting hook occurs
Carbon black, so that connecting hook is more crisp, i.e., connecting hook is easy to happen fracture or damage.The too low phosphorus content drop that will lead to connecting hook of carbon potential
It is low, and then the bearing capacity on connecting hook surface is reduced, reduce the service life of connecting hook.Therefore pass through 900-920 DEG C of high temperature
So that the carbon potential CP of the carbon impregnation stage of connecting hook is 1.1 ± 0.05,0.8 ± 0.05 and 0.8 ± 0.05, so that connecting hook
Phosphorus content reach requirement just, further increase connecting hook heat treatment after service life；
S3: it is cooling, connecting hook is taken out out of heating furnace, fast quickly cooling is carried out to connecting hook using 60-80 DEG C of quenching oil
But, 25-35min cooling time；
It replaces the slow oil of traditional classification cooling by the way that rapid oil is cooling, improves the harden ability of connecting hook, and make its layer depth
It is more uniform, and the color on surface is more uniform full, and then increases the service life after connecting hook heat treatment.
S4: connecting hook after heating furnace is cooled to 180-200 DEG C, is put into heating furnace, keeps the temperature 170-190min by tempering；
By a lonneal, the brittleness of connecting hook is further decreased, further eliminates or reduces the interior of connecting hook and answer
Power improves the toughness and plasticity of connecting hook, further increases the quality of connecting hook, makes after improving connecting hook heat treatment
Use the service life.
| Project | The present embodiment |
| Surface hardness | 56-62HRC |
| Case depth | More than 1.02mm |
| Tensile strength | 1000MPa or more |
| Testing inspection service life | 10000 times or more |
Specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
It can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as in this hair
All by the protection of Patent Law in bright scope of the claims.
Claims (8)
1. a kind of train connecting hook heat treatment process, characterized by the following steps:
S1: connecting hook is placed in heating furnace by heating by heating furnace continuous heating to after 900-920 DEG C, keeps the temperature 30-
40min；
S2: carburizing includes the following steps:
S21: it is strong to seep, it remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keep the temperature 390-410min；
S22: diffusion remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keeps the temperature 190-210min；
S3: it is cooling, connecting hook is taken out out of heating furnace, it is cold to carry out oil to connecting hook, cooling time 25-35min；
S4: connecting hook after heating furnace is cooled to 180-200 DEG C, is put into heating furnace, keeps the temperature 170-190min by tempering.
2. a kind of train connecting hook heat treatment process according to claim 1, it is characterised in that: step S2 further include as
Lower step:
S23: heat preservation, continued down remain temperature-resistant, keep the temperature 25-35min to 830-850 DEG C.
3. a kind of train connecting hook heat treatment process according to claim 2, it is characterised in that: in step S3, use
60-80 DEG C of quenching oil is quickly cooled down.
4. a kind of train connecting hook heat treatment process according to claim 3, it is characterised in that: the carbon in step S21
Gesture CP is 1.1 ± 0.05, and the carbon potential CP in step S22 is 0.8 ± 0.05, and the carbon potential CP in step S23 is 0.8 ± 0.05.
5. a kind of train connecting hook heat treatment process according to claim 4, it is characterised in that: adding in step S21
Hot temperature is 910 DEG C, soaking time 400min.
6. a kind of train connecting hook heat treatment process according to claim 4, it is characterised in that: adding in step S22
Hot temperature is 910 DEG C, soaking time 200min.
7. a kind of train connecting hook heat treatment process according to claim 4, it is characterised in that: adding in step S23
Hot temperature is 840 DEG C, soaking time 30min.
8. a kind of train connecting hook heat treatment process according to claim 1, it is characterised in that: the material of connecting hook is
40Cr。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097013.XA CN109136477A (en) | 2018-09-19 | 2018-09-19 | A kind of train connecting hook heat treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097013.XA CN109136477A (en) | 2018-09-19 | 2018-09-19 | A kind of train connecting hook heat treatment process |
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| CN109136477A true CN109136477A (en) | 2019-01-04 |
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| CN201811097013.XA Pending CN109136477A (en) | 2018-09-19 | 2018-09-19 | A kind of train connecting hook heat treatment process |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710714A (en) * | 2012-12-07 | 2014-04-09 | 厦门真冈热处理有限公司 | Automobile gearbox gear carburizing and quenching heat treatment method |
| 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 |
| CN105239033A (en) * | 2015-11-10 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Composite carburizing and quenching heat treatment method of gear |
| CN105586599A (en) * | 2014-11-14 | 2016-05-18 | 重庆春顾机械制造有限公司 | Thermal treatment method for carburizing and quenching of gearbox gears |
| CN105689969A (en) * | 2014-11-26 | 2016-06-22 | 重庆市巴南区永兴机械厂 | Guide post processing technology |
| CN105986220A (en) * | 2015-01-30 | 2016-10-05 | 重庆文力机械有限公司 | Heat processing method for carburizing and quenching |
| CN107805776A (en) * | 2017-10-23 | 2018-03-16 | 金川集团股份有限公司 | A kind of carburizing carbon potential DISTRIBUTION CONTROL PROCESS of 23CrNi3MoA drilling tools material |
-
2018
- 2018-09-19 CN CN201811097013.XA patent/CN109136477A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710714A (en) * | 2012-12-07 | 2014-04-09 | 厦门真冈热处理有限公司 | Automobile gearbox gear carburizing and quenching heat treatment method |
| CN105586599A (en) * | 2014-11-14 | 2016-05-18 | 重庆春顾机械制造有限公司 | Thermal treatment method for carburizing and quenching of gearbox gears |
| CN105689969A (en) * | 2014-11-26 | 2016-06-22 | 重庆市巴南区永兴机械厂 | Guide post processing technology |
| CN105986220A (en) * | 2015-01-30 | 2016-10-05 | 重庆文力机械有限公司 | Heat processing method for carburizing and quenching |
| 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 |
| CN105239033A (en) * | 2015-11-10 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Composite carburizing and quenching heat treatment method of gear |
| CN107805776A (en) * | 2017-10-23 | 2018-03-16 | 金川集团股份有限公司 | A kind of carburizing carbon potential DISTRIBUTION CONTROL PROCESS of 23CrNi3MoA drilling tools material |
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Application publication date: 20190104 |
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