CN107760847A - A kind of heat treatment method of bearing pin for low temperature environment - Google Patents
A kind of heat treatment method of bearing pin for low temperature environment Download PDFInfo
- Publication number
- CN107760847A CN107760847A CN201610690298.2A CN201610690298A CN107760847A CN 107760847 A CN107760847 A CN 107760847A CN 201610690298 A CN201610690298 A CN 201610690298A CN 107760847 A CN107760847 A CN 107760847A
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- CN
- China
- Prior art keywords
- bearing pin
- heat treatment
- low temperature
- temperature environment
- treatment method
- 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.)
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Classifications
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
Abstract
The invention discloses a kind of heat treatment method of the bearing pin for low temperature environment, and for the heat treatment to completing mechanical preliminary working rear pin shaft blank, the material of the bearing pin blank is 40CrNiMo, and the heat treatment includes Quenching Treatment and temper that order is carried out；During the Quenching Treatment, including the holding stage of order progress and slow cooling stage, for the temperature of the holding stage between 853 DEG C to 860 DEG C, soaking time is no less than 2.5h；Heating-up temperature during the temper is between 580 DEG C to 600 DEG C；Also include being arranged at the Carburization Treatment process before Quenching Treatment process, the Carburization Treatment process is incubated for bearing pin blank is placed in carburizing environment, between being heated to 890 DEG C to 900 DEG C and is no less than 5h.Using Technology for Heating Processing provided above, the bearing pin at low ambient temperatures with long service life is can obtain, while there is good surface abrasion resistance.
Description
Technical field
The present invention relates to mechanical fastener manufacturing technology field, more particularly to a kind of heat of the bearing pin for low temperature environment
Processing method.
Background technology
Bearing pin is the fastener of a kind of standardization, is typically locked by split pin, both can static state be fixedly connected, also can be with quilt
Connector does relative motion, and is mainly used in the hinged place of two parts, forms hinge connection.Bearing pin reliable operation, convenient disassembly, quilt
It is widely used as the mechanical fastener of construction applications.
In the prior art, bearing pin is used for different working environments, for specific requirement, generally requires selection and closes
The raw material that suitable material makes as bearing pin, but raw material are carried out with the heat treatment of different process, also can be to bearing pin product
Performance produce large effect.The bearing pin durability being used in the prior art under cold environment is poor, is typically implemented in
In low-temperature impact property, the bearing pin Technology for Heating Processing under cold environment is made further research, to optimize under the use condition
The service life of bearing pin, it is urgent problem to be solved in the prior art.
The content of the invention
It is poor for the above-mentioned bearing pin durability being used in the prior art under cold environment, it is typically implemented in low-temperature impact resistance
In performance, the bearing pin Technology for Heating Processing under cold environment is made further research, to optimize the use of the use condition lower bearing pin
In the life-span, it is urgent problem to be solved in the prior art, the invention provides a kind of heat treatment side of the bearing pin for low temperature environment
Method.
In view of the above-mentioned problems, a kind of heat treatment method of bearing pin for low temperature environment provided by the invention passes through following skill
Art main points reach goal of the invention：The heat treatment method of a kind of bearing pin for low temperature environment, for completing mechanical preliminary working
The heat treatment of rear pin shaft blank, the material of the bearing pin blank is 40CrNiMo, and the heat treatment includes the quenching that order is carried out
Processing and temper；
During the Quenching Treatment, including the holding stage of order progress and slow cooling stage, the temperature of the holding stage are situated between
Between 853 DEG C to 860 DEG C, soaking time is no less than 2.5h；
Heating-up temperature during the temper is between 580 DEG C to 600 DEG C；Also include being arranged at Quenching Treatment process
Carburization Treatment process before, the Carburization Treatment process are heated to 890 DEG C extremely for bearing pin blank is placed in carburizing environment
Insulation is no less than 5h between 900 DEG C.
Specifically, in above Technology for Heating Processing, for this materials of 40CrNiMo, the selection of conventional hardening heat is 800
DEG C or so, with mainly for austenitizing, then in rapid cooling to realize martensite transfor mation；The existing tempering for 40CrNiMo
Cheng Zhong, using the lonneal for being usually no more than 200 DEG C, in order to obtain higher hardness number and intensity level.This technique
In, by experiment repeatedly, hardening heat is chosen for improve 50 DEG C or so compared to prior art, mainly for closing in material
The solubility and homogenization degree of gold element；Compared to prior art, temperature multiplication, the material after being heat-treated may be such that
Material, although sacrificing part hardness number and intensity level, the low-temperature impact resistance ability of product has obtained significant raising.
By above Technology for Heating Processing, compared to prior art, when 40CrNiMo materials are as bearing pin purposes, compared to
The bearing pin of conventionally employed same material, although the performance decrease to some degree such as wearability and intensity, ring is used in low temperature
Under border, the shock loading under cryogenic conditions is the main reason for bearing pin destroys, therefore the bearing pin being thermally treated resulting in more than, is used
Life-span would generally reach more than the three times of prior art.
The Carburization Treatment process of arrangement above, it is easy to so that the bearing pin obtained by this Technology for Heating Processing, has well
Case hardness, so, gained bearing pin is while its good center toughness is played, also with good surface abrasion resistance.
Further technical scheme is：
Be easy to the slow cooling mode of control as a kind of specific cooling velocity, with avoid producing cool down in pressure crackle the defects of,
The slow cooling stage uses oil cooling.
As a kind of heat treatment mode beneficial to modulation effect, to reach in quenched preceding refiner material crystal grain, eliminate material
In internal stress concrete scheme, in addition to the normalized treatment before the Quenching Treatment.This programme is especially suitable for blank material
Expect the situation for forging.
As it is a kind of eliminate firing rate, furnace temperature decision, single stove piece count to be tempered influential effect technical side
Case, the soaking time of the drawing process are no less than 1.5h.
For this materials of 40CrNiMo, further to eliminate internal stress, the number of the temper is more than once.It is real
The bearing pin for low temperature environment bright, this material makes is verified, carries out the service life of bearing pin of double tempering compared to only adopting
The service life being tempered with a same parameter, extends about 0.5 times.Carry out tempering operation more than twice simultaneously, just return three times
Fire compared to there is certain service life lifting twice, it is but little for influence of the tempering three times to service life, as
It is preferred that for the benefit of production efficiency, this case use double tempering.
As the specific implementation of above Carburization Treatment process, the carbon potential concentration of the carburizing environment between 0.9% to
1.04%。
The invention has the advantages that：
In above Technology for Heating Processing, for this materials of 40CrNiMo, the selection of conventional hardening heat is 800 DEG C or so, with master
Austenitizing is directed to, then in rapid cooling to realize martensite transfor mation；In the existing drawing process for 40CrNiMo, using one
As be no more than 200 DEG C of lonneal, in order to obtain higher hardness number and intensity level.In this technique, by repeatedly
Experiment, by hardening heat be chosen for compared to prior art improve 50 DEG C or so, mainly in material alloying element it is molten
Xie Du and homogenization degree；Compared to prior art, temperature multiplication, the material after being heat-treated is may be such that, although sacrificial
Domestic animal part hardness number and intensity level, but the low-temperature impact resistance ability of product obtained significant raising.
By above Technology for Heating Processing, compared to prior art, when 40CrNiMo materials are as bearing pin purposes, compared to
The bearing pin of conventionally employed same material, although the performance decrease to some degree such as wearability and intensity, ring is used in low temperature
Under border, the shock loading under cryogenic conditions is the main reason for bearing pin destroys, therefore the bearing pin being thermally treated resulting in more than, is used
Life-span would generally reach more than the three times of prior art.
The Carburization Treatment process of arrangement above, it is easy to so that the bearing pin obtained by this Technology for Heating Processing, has well
Case hardness, so, gained bearing pin is while its good center toughness is played, also with good surface abrasion resistance.
Embodiment
With reference to embodiment, the present invention is described in further detail, but the present invention structure be not limited only to it is following
Embodiment.
Embodiment 1：
The heat treatment method of a kind of bearing pin for low temperature environment, at the heat to completing mechanical preliminary working rear pin shaft blank
Reason, the material of the bearing pin blank is 40CrNiMo, and the heat treatment includes Quenching Treatment and temper that order is carried out；
During the Quenching Treatment, including the holding stage of order progress and slow cooling stage, the temperature of the holding stage are situated between
Between 853 DEG C to 860 DEG C, soaking time is no less than 2.5h；
Heating-up temperature during the temper is between 580 DEG C to 600 DEG C；Also include being arranged at Quenching Treatment process
Carburization Treatment process before, the Carburization Treatment process are heated to 890 DEG C extremely for bearing pin blank is placed in carburizing environment
Insulation is no less than 5h between 900 DEG C.
Specifically, in above Technology for Heating Processing, for this materials of 40CrNiMo, the selection of conventional hardening heat is 800
DEG C or so, with mainly for austenitizing, then in rapid cooling to realize martensite transfor mation；The existing tempering for 40CrNiMo
Cheng Zhong, using the lonneal for being usually no more than 200 DEG C, in order to obtain higher hardness number and intensity level.This technique
In, by experiment repeatedly, hardening heat is chosen for improve 50 DEG C or so compared to prior art, mainly for closing in material
The solubility and homogenization degree of gold element；Compared to prior art, temperature multiplication, the material after being heat-treated may be such that
Material, although sacrificing part hardness number and intensity level, the low-temperature impact resistance ability of product has obtained significant raising.
By above Technology for Heating Processing, compared to prior art, when 40CrNiMo materials are as bearing pin purposes, compared to
The bearing pin of conventionally employed same material, although the performance decrease to some degree such as wearability and intensity, ring is used in low temperature
Under border, the shock loading under cryogenic conditions is the main reason for bearing pin destroys, therefore the bearing pin being thermally treated resulting in more than, is used
Life-span would generally reach more than the three times of prior art.
The Carburization Treatment process of arrangement above, it is easy to so that the bearing pin obtained by this Technology for Heating Processing, has well
Case hardness, so, gained bearing pin is while its good center toughness is played, also with good surface abrasion resistance.
Embodiment 2：
The present embodiment is further qualified on the basis of embodiment 1, is easy to the slow of control as a kind of specific cooling velocity
Cold mode, with avoid produce cool down in pressure crackle the defects of, the slow cooling stage uses oil cooling.
As a kind of heat treatment mode beneficial to modulation effect, to reach in quenched preceding refiner material crystal grain, eliminate material
In internal stress concrete scheme, in addition to the normalized treatment before the Quenching Treatment.This programme is especially suitable for blank material
Expect the situation for forging.
As it is a kind of eliminate firing rate, furnace temperature decision, single stove piece count to be tempered influential effect technical side
Case, the soaking time of the drawing process are no less than 1.5h.
For this materials of 40CrNiMo, further to eliminate internal stress, the number of the temper is more than once.It is real
The bearing pin for low temperature environment bright, this material makes is verified, carries out the service life of bearing pin of double tempering compared to only adopting
The service life being tempered with a same parameter, extends about 0.5 times.Carry out tempering operation more than twice simultaneously, just return three times
Fire compared to there is certain service life lifting twice, it is but little for influence of the tempering three times to service life, as
It is preferred that for the benefit of production efficiency, this case use double tempering.
860 DEG C of insulation 4h quenchings are used in the present embodiment, using 585 DEG C of insulation 3h tempering, and times of tempering is twice, together
When quenching using oil cooling by the way of, obtained bearing pin is tested suitable for -50 DEG C of working environment through stress loading, its use
Life-span is five times of identical material bearing pin in the prior art.
As the specific implementation of above Carburization Treatment process, the carbon potential concentration of the carburizing environment between 0.9% to
1.04%。
Above content is to combine the further description that specific preferred embodiment is made to the present invention, it is impossible to assert this
The embodiment of invention is confined to these explanations.For general technical staff of the technical field of the invention,
The other embodiment drawn in the case where not departing from technical scheme, should be included within the scope of the present invention.
Claims (6)
- A kind of 1. heat treatment method of bearing pin for low temperature environment, at the heat to completing mechanical preliminary working rear pin shaft blank Reason, it is characterised in that the material of the bearing pin blank be 40CrNiMo, it is described heat treatment include sequentially progress Quenching Treatment and Temper；During the Quenching Treatment, including the holding stage of order progress and slow cooling stage, the temperature of the holding stage are situated between Between 853 DEG C to 860 DEG C, soaking time is no less than 2.5h；Heating-up temperature during the temper is between 580 DEG C to 600 DEG C；Also include being arranged at Quenching Treatment process Carburization Treatment process before, the Carburization Treatment process are heated to 890 DEG C extremely for bearing pin blank is placed in carburizing environment Insulation is no less than 5h between 900 DEG C.
- 2. the heat treatment method of a kind of bearing pin for low temperature environment according to claim 1, it is characterised in that described slow The cold stage uses oil cooling.
- 3. the heat treatment method of a kind of bearing pin for low temperature environment according to claim 1, it is characterised in that also include Normalized treatment before Quenching Treatment.
- 4. the heat treatment method of a kind of bearing pin for low temperature environment according to claim 1, it is characterised in that described time The soaking time of fiery process is no less than 1.5h.
- 5. the heat treatment method of a kind of bearing pin for low temperature environment according to claim 1, it is characterised in that described time Fiery number of processing is more than once.
- 6. the heat treatment method of a kind of bearing pin for low temperature environment according to claim 1, it is characterised in that described to ooze The carbon potential concentration in carbocyclic ring border is between 0.9% to 1.04%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610690298.2A CN107760847A (en) | 2016-08-19 | 2016-08-19 | A kind of heat treatment method of bearing pin for low temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610690298.2A CN107760847A (en) | 2016-08-19 | 2016-08-19 | A kind of heat treatment method of bearing pin for low temperature environment |
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| Publication Number | Publication Date |
|---|---|
| CN107760847A true CN107760847A (en) | 2018-03-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610690298.2A Pending CN107760847A (en) | 2016-08-19 | 2016-08-19 | A kind of heat treatment method of bearing pin for low temperature environment |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611429A (en) * | 2018-12-27 | 2019-04-12 | 陕西铁马铸锻有限公司 | Pin shaft and its heat treatment process |
| CN110144546A (en) * | 2019-03-15 | 2019-08-20 | 博格华纳汽车零部件(宁波)有限公司 | A kind of engine timing chain pin shaft carbonitriding technology |
-
2016
- 2016-08-19 CN CN201610690298.2A patent/CN107760847A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611429A (en) * | 2018-12-27 | 2019-04-12 | 陕西铁马铸锻有限公司 | Pin shaft and its heat treatment process |
| CN109611429B (en) * | 2018-12-27 | 2021-04-02 | 陕西铁马铸锻有限公司 | Pin shaft and heat treatment process thereof |
| CN110144546A (en) * | 2019-03-15 | 2019-08-20 | 博格华纳汽车零部件(宁波)有限公司 | A kind of engine timing chain pin shaft carbonitriding technology |
| CN110144546B (en) * | 2019-03-15 | 2021-07-06 | 博格华纳汽车零部件(宁波)有限公司 | Carbonitriding process for pin shaft of timing chain of engine |
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Application publication date: 20180306 |