CN105886738A - Heat treatment technology for hinge pin - Google Patents
Heat treatment technology for hinge pin Download PDFInfo
- Publication number
- CN105886738A CN105886738A CN201610294239.3A CN201610294239A CN105886738A CN 105886738 A CN105886738 A CN 105886738A CN 201610294239 A CN201610294239 A CN 201610294239A CN 105886738 A CN105886738 A CN 105886738A
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- CN
- China
- Prior art keywords
- bearing pin
- heat treatment
- temperature
- heating processing
- hinge pin
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- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment technology for a hinge pin. The heat treatment technology is used for carrying out heat treatment on a hinge pin workblank subjected to mechanical primary processing, and the material of the hinge pin workblank is 40CrNiMo. The heat treatment technology comprises quenching treatment and tempering treatment which are carried out in sequence, wherein the quenching treatment process comprises a temperature keeping stage and a slow cooling stage which are carried out in sequence; in the temperature keeping stage, the temperature is between 853 DEG C and 860 DEG C, and the temperature keeping time is no less than 2.5 h; and in the tempering treatment process, the heating temperature is between 580 DEG C and 600 DEG C. Through the adoption of the heat treatment technology provided by the invention, the hinge pin which has a relatively long service life in a low temperature environment can be obtained.
Description
Technical field
The present invention relates to mechanical fastener manufacturing technology field, particularly relate to a kind of bearing pin Technology for Heating Processing.
Background technology
Bearing pin is the securing member of a class standard, is typically locked by split pin, both static can fix and connect, also can do relative motion with connected piece, be mainly used in the hinged place of two parts, constitute chain connection.Bearing pin reliable operation, convenient disassembly, it is widely used as the mechanical fastener of construction applications.
In prior art, bearing pin is used for different working environments, for concrete use requirement, it is generally required to choose the raw material that suitable material makes as bearing pin, but raw material is carried out the heat treatment of different process, also the serviceability of bearing pin product can be produced large effect.In prior art, the bearing pin ruggedness under cold environment is poor, it is typically implemented in low-temperature impact property, bearing pin Technology for Heating Processing under cold environment is made further research, to optimize the service life of bearing pin under the conditions of this use, is problem demanding prompt solution in prior art.
Summary of the invention
Poor for the bearing pin ruggedness under cold environment in above-mentioned prior art, it is typically implemented in low-temperature impact property, bearing pin Technology for Heating Processing under cold environment is made further research, to optimize the service life of bearing pin under the conditions of this use, it is problem demanding prompt solution in prior art, the invention provides a kind of bearing pin Technology for Heating Processing.
For the problems referred to above, a kind of bearing pin Technology for Heating Processing that the present invention provides reaches goal of the invention by techniques below main points: a kind of bearing pin Technology for Heating Processing, for to the heat treatment completing machinery preliminary working rear pin shaft blank, the material of described bearing pin blank is 40CrNiMo, and described heat treatment includes Quenching Treatment and the temper sequentially carried out；
During described Quenching Treatment, the holding stage carried out including order and slow cooling stage, the temperature of described holding stage is between 853 DEG C to 860 DEG C, and temperature retention time is no less than 2.5h；
Heating-up temperature during described temper is between 580 DEG C to 600 DEG C.
Concrete, in above Technology for Heating Processing, for this material of 40CrNiMo, conventional hardening heat is chosen as about 800 DEG C, with mainly for austenitizing, then in rapid cooling to realize martensite transfor mation；Existing in the drawing process of 40CrNiMo, use and be usually no more than the lonneal of 200 DEG C in order to obtain higher hardness number and intensity level.In this technique, by experiment repeatedly, it is chosen for hardening heat improving about 50 DEG C compared to prior art, mainly for the dissolubility of alloying element in material and homogenization degree；Compared to prior art, temperature doubles, can allow to carry out the material after heat treatment, although sacrifice part hardness number and intensity level, but the low-temperature impact resistance ability of product has obtained significant raising.
By above Technology for Heating Processing; compared to prior art; when 40CrNiMo material is as bearing pin purposes; bearing pin compared to conventionally employed same material; although the performance decrease to some degree such as wearability and intensity, but under low temperature uses environment, the shock loading under cryogenic conditions is the main cause that bearing pin destroys; therefore by the bearing pin being thermally treated resulting in above, more than three times of prior art would generally be reached service life.
Further technical scheme is:
Be easy to the slow cooling mode controlled as a kind of concrete rate of cooling, to avoid producing the defects such as the interior pressure crackle of cooling, the described slow cooling stage uses oil cold.
As a kind of heat treatment mode being beneficial to modulation effect, to reach the concrete scheme of the internal stress in quenched front refiner material crystal grain, elimination material, also include being positioned at the normalized treatment before Quenching Treatment.This programme is particularly well-suited to the situation that blank material is forging.
Eliminating firing rate, furnace temperature decision, single stove piece count technical scheme to tempering influential effect as a kind of, the temperature retention time of described drawing process is no less than 1.5h.
For this material of 40CrNiMo, for eliminating internal stress further, the number of times of described temper is more than once.It is demonstrated experimentally that the bearing pin for low temperature environment that this material makes, carry out the service life of bearing pin of double tempering compared to the service life only with the tempering of same parameter, extend about 0.5 times.Carry out more than twice tempering operation simultaneously, just promotes certain service life that has compared to twice of three tempering, but be tempered the impact on service life not quite for three times, as preferably, for the benefit of production efficiency, this case employing double tempering.
The method have the advantages that
In above Technology for Heating Processing, for this material of 40CrNiMo, conventional hardening heat is chosen as about 800 DEG C, with mainly for austenitizing, then in rapid cooling to realize martensite transfor mation；Existing in the drawing process of 40CrNiMo, use and be usually no more than the lonneal of 200 DEG C in order to obtain higher hardness number and intensity level.In this technique, by experiment repeatedly, it is chosen for hardening heat improving about 50 DEG C compared to prior art, mainly for the dissolubility of alloying element in material and homogenization degree；Compared to prior art, temperature doubles, can allow to carry out the material after heat treatment, although sacrifice part hardness number and intensity level, but the low-temperature impact resistance ability of product has obtained significant raising.
By above Technology for Heating Processing; compared to prior art; when 40CrNiMo material is as bearing pin purposes; bearing pin compared to conventionally employed same material; although the performance decrease to some degree such as wearability and intensity, but under low temperature uses environment, the shock loading under cryogenic conditions is the main cause that bearing pin destroys; therefore by the bearing pin being thermally treated resulting in above, more than three times of prior art would generally be reached service life.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but the structure of the present invention is not limited only to following example.
Embodiment 1:
A kind of bearing pin Technology for Heating Processing, is used for the heat treatment completing machinery preliminary working rear pin shaft blank, and the material of described bearing pin blank is 40CrNiMo, and described heat treatment includes Quenching Treatment and the temper sequentially carried out；
During described Quenching Treatment, the holding stage carried out including order and slow cooling stage, the temperature of described holding stage is between 853 DEG C to 860 DEG C, and temperature retention time is no less than 2.5h；
Heating-up temperature during described temper is between 580 DEG C to 600 DEG C.
Concrete, in above Technology for Heating Processing, for this material of 40CrNiMo, conventional hardening heat is chosen as about 800 DEG C, with mainly for austenitizing, then in rapid cooling to realize martensite transfor mation；Existing in the drawing process of 40CrNiMo, use and be usually no more than the lonneal of 200 DEG C in order to obtain higher hardness number and intensity level.In this technique, by experiment repeatedly, it is chosen for hardening heat improving about 50 DEG C compared to prior art, mainly for the dissolubility of alloying element in material and homogenization degree；Compared to prior art, temperature doubles, can allow to carry out the material after heat treatment, although sacrifice part hardness number and intensity level, but the low-temperature impact resistance ability of product has obtained significant raising.
By above Technology for Heating Processing; compared to prior art; when 40CrNiMo material is as bearing pin purposes; bearing pin compared to conventionally employed same material; although the performance decrease to some degree such as wearability and intensity, but under low temperature uses environment, the shock loading under cryogenic conditions is the main cause that bearing pin destroys; therefore by the bearing pin being thermally treated resulting in above, more than three times of prior art would generally be reached service life.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1, is easy to the slow cooling mode controlled as a kind of concrete rate of cooling, and to avoid producing the defects such as the interior pressure crackle of cooling, the described slow cooling stage uses oil cold.
As a kind of heat treatment mode being beneficial to modulation effect, to reach the concrete scheme of the internal stress in quenched front refiner material crystal grain, elimination material, also include being positioned at the normalized treatment before Quenching Treatment.This programme is particularly well-suited to the situation that blank material is forging.
Eliminating firing rate, furnace temperature decision, single stove piece count technical scheme to tempering influential effect as a kind of, the temperature retention time of described drawing process is no less than 1.5h.
For this material of 40CrNiMo, for eliminating internal stress further, the number of times of described temper is more than once.It is demonstrated experimentally that the bearing pin for low temperature environment that this material makes, carry out the service life of bearing pin of double tempering compared to the service life only with the tempering of same parameter, extend about 0.5 times.Carry out more than twice tempering operation simultaneously, just promotes certain service life that has compared to twice of three tempering, but be tempered the impact on service life not quite for three times, as preferably, for the benefit of production efficiency, this case employing double tempering.
The present embodiment uses 860 DEG C of insulation 4h quenchings, uses 585 DEG C of insulation 3h tempering, and times of tempering is twice, quenching simultaneously uses the mode that oil is cold, the bearing pin obtained, be applicable to the working environment of-50 DEG C, is tested through stress loading, and its service life is in prior art five times of identical material bearing pin.
Above content is to combine the further description that the present invention is made by concrete preferred implementation, it is impossible to assert that the detailed description of the invention of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, other embodiments drawn under without departing from technical scheme, should be included in protection scope of the present invention.
Claims (5)
1. a bearing pin Technology for Heating Processing, for the heat treatment completing machinery preliminary working rear pin shaft blank, it is characterised in that the material of described bearing pin blank is 40CrNiMo, described heat treatment includes Quenching Treatment and the temper sequentially carried out；
During described Quenching Treatment, the holding stage carried out including order and slow cooling stage, the temperature of described holding stage is between 853 DEG C to 860 DEG C, and temperature retention time is no less than 2.5h；
Heating-up temperature during described temper is between 580 DEG C to 600 DEG C.
A kind of bearing pin Technology for Heating Processing the most according to claim 1, it is characterised in that the described slow cooling stage uses oil cold.
A kind of bearing pin Technology for Heating Processing the most according to claim 1, it is characterised in that also include being positioned at the normalized treatment before Quenching Treatment.
A kind of bearing pin Technology for Heating Processing the most according to claim 1, it is characterised in that the temperature retention time of described drawing process is no less than 1.5h.
A kind of bearing pin Technology for Heating Processing the most according to claim 1, it is characterised in that the number of times of described temper is more than once.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610294239.3A CN105886738A (en) | 2016-05-03 | 2016-05-03 | Heat treatment technology for hinge pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610294239.3A CN105886738A (en) | 2016-05-03 | 2016-05-03 | Heat treatment technology for hinge pin |
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| CN105886738A true CN105886738A (en) | 2016-08-24 |
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| CN201610294239.3A Pending CN105886738A (en) | 2016-05-03 | 2016-05-03 | Heat treatment technology for hinge pin |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541587A (en) * | 2017-10-24 | 2018-01-05 | 徐州市华圆机械厂 | A kind of bearing pin Technology for Heating Processing |
| CN108424999A (en) * | 2018-04-27 | 2018-08-21 | 宁夏石炭井炭化实业公司 | A kind of heat treatment process of shallow-tank separator driving chain parts |
| CN109371206A (en) * | 2018-12-24 | 2019-02-22 | 海盐城西热处理有限公司 | A kind of pivot pin heat treatment process |
| CN110457729A (en) * | 2019-05-17 | 2019-11-15 | 陕西飞机工业（集团）有限公司 | Optimization method, device and the axial workpiece of semi-closed structure steel heat treatment part |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102242322A (en) * | 2011-06-29 | 2011-11-16 | 江苏环立板带轧辊有限公司 | Improved 40CrNiMo steel and preparation method thereof |
| CN102899579A (en) * | 2012-08-08 | 2013-01-30 | 南车玉柴四川发动机股份有限公司 | Large power engine crankshaft and manufacturing method |
| CN104289858A (en) * | 2013-07-16 | 2015-01-21 | 无锡华冶钢铁有限公司 | 42CrMoE structural alloy steel material and pin shaft processing method |
-
2016
- 2016-05-03 CN CN201610294239.3A patent/CN105886738A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102242322A (en) * | 2011-06-29 | 2011-11-16 | 江苏环立板带轧辊有限公司 | Improved 40CrNiMo steel and preparation method thereof |
| CN102899579A (en) * | 2012-08-08 | 2013-01-30 | 南车玉柴四川发动机股份有限公司 | Large power engine crankshaft and manufacturing method |
| CN104289858A (en) * | 2013-07-16 | 2015-01-21 | 无锡华冶钢铁有限公司 | 42CrMoE structural alloy steel material and pin shaft processing method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541587A (en) * | 2017-10-24 | 2018-01-05 | 徐州市华圆机械厂 | A kind of bearing pin Technology for Heating Processing |
| CN108424999A (en) * | 2018-04-27 | 2018-08-21 | 宁夏石炭井炭化实业公司 | A kind of heat treatment process of shallow-tank separator driving chain parts |
| CN108424999B (en) * | 2018-04-27 | 2019-08-30 | 宁夏石炭井炭化实业公司 | A kind of heat treatment process of shallow-tank separator driving chain components |
| CN109371206A (en) * | 2018-12-24 | 2019-02-22 | 海盐城西热处理有限公司 | A kind of pivot pin heat treatment process |
| CN110457729A (en) * | 2019-05-17 | 2019-11-15 | 陕西飞机工业（集团）有限公司 | Optimization method, device and the axial workpiece of semi-closed structure steel heat treatment part |
| CN110457729B (en) * | 2019-05-17 | 2023-04-14 | 陕西飞机工业（集团）有限公司 | Optimization method and device for semi-closed structural steel heat treatment part and shaft part |
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Application publication date: 20160824 |
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