CN113073180A - Heat treatment processing technology for powder part - Google Patents
Heat treatment processing technology for powder part Download PDFInfo
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- CN113073180A CN113073180A CN202110311398.0A CN202110311398A CN113073180A CN 113073180 A CN113073180 A CN 113073180A CN 202110311398 A CN202110311398 A CN 202110311398A CN 113073180 A CN113073180 A CN 113073180A
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- Prior art keywords
- powder piece
- powder
- piece
- heating
- heat treatment
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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
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the technical field of metal heat treatment processes, and discloses a heat treatment processing process for a powder piece, which comprises the following steps: heating, namely heating the powder piece to 850-900 ℃ within 1 second by using a current generated by an induction coil through a magnetic field in a high-frequency process at normal temperature, instantaneously heating the powder piece to 900 ℃, and keeping the temperature for 1 second; and (4) cooling the air, stopping heating by the high-frequency machine, enabling the powder piece to stay in the air, and naturally cooling the powder piece for 1 second in the air. According to the powder piece heat treatment processing technology, the instant temperature of the powder piece is innovatively increased to 900 ℃ and lasts for 1 second, so that the heating is finished before the powder piece is not oxidized; the heated powder piece is placed in the air and naturally cooled for 1 second, so that the surface temperature and the internal temperature of the powder piece are balanced, the crack rate of the powder piece is effectively reduced, the product percent of pass is improved, the powder piece is more finely and uniformly organized, and high hardness and high strength can be still obtained.
Description
Technical Field
The invention relates to the technical field of metal heat treatment processes, in particular to a heat treatment processing process for a powder piece.
Background
The powder piece is formed by pressing metal powder at high temperature and high pressure, and then is subjected to hardness and toughness heat treatment by a treatment process such as high-frequency quenching, the powder piece has the advantages of high strength, high hardness, high wear resistance and the like, and the powder piece gradually replaces metal parts of a traditional process in the fields of automobile industry and the like at present and becomes the development trend of future metal parts.
Through research, the powder piece is heated to 850-900 ℃ within 1.5 seconds by current generated by an induction coil through a magnetic field at normal temperature in a high-frequency process, and then is quenched and cooled to generate internal stress to crack, and the main reason is that the powder piece is formed by extruding fine steel particles at high temperature and high pressure and the structure density reaches more than 7 grades through continuous high-temperature sintering; however, gaps still exist among the structures, and cracks are easy to generate at instant high temperature and cooling, so that the control on the process procedure is very important, at present, when the powder piece is subjected to high-frequency quenching by utilizing the traditional process, the probability of the cracks is as high as about 70%, how to reduce the probability of the cracks, and how to improve the product yield is a problem to be solved urgently at present.
Disclosure of Invention
The invention provides a powder part heat treatment processing technology, which has the advantages of eliminating the internal stress of the powder part, improving the structure stability, adjusting the mechanical property of a workpiece, stabilizing the size of the workpiece and reducing the reject ratio, and solves the problems in the background technology.
The invention provides the following technical scheme: a heat treatment processing technology for powder pieces comprises the following steps:
s1, heating, namely heating to 850-900 ℃ within 1 second by using a current generated by an induction coil through a magnetic field in a high-frequency process at normal temperature, instantaneously heating the powder piece to 900 ℃, and keeping for 1 second;
s2, cooling air, stopping heating by the high-frequency machine, enabling the powder piece to stay in the air, and naturally cooling the powder piece in the air for 1 second, so that heating is finished before oxidation, the internal and external fall range of the powder piece tissue is shortened, and cracks are avoided;
s3, tempering, namely taking out the powder piece after air cooling, and putting the powder piece into quenching liquid to cool the powder piece in the quenching liquid for 5 seconds;
and S4, cooling, namely cooling the cooled powder piece to 40-50 ℃ at normal temperature, taking out the powder piece, jumping out of a dangerous cracking area, reducing the cracking rate of the powder piece, and improving the hardness and strength of the powder piece.
Preferably, the tempering of the powder piece in the third step is performed within 4 hours after the powder piece is produced.
Preferably, the tempering temperature of the powder piece in the third step is 150 ℃.
Preferably, the tempering time of the powder piece in the third step is 3 min.
Preferably, in the first step, the powder piece is preheated during heating, the output power is reduced by 50%, the preheating operation is performed first to improve the rapid heating condition, and the powder piece is preheated in a high-frequency machine to be heated to 300-500 ℃.
Preferably, the preheating process is followed by cooling, and the high-frequency machine is stopped from heating, so that the powder piece is naturally cooled in the air for 1 to 5 seconds.
The invention has the following beneficial effects:
1. according to the powder piece heat treatment processing technology, the instant temperature of the powder piece is innovatively increased to 900 ℃ and lasts for 1 second, so that the heating is finished before the powder piece is not oxidized; the heated powder piece is placed in the air and naturally cooled for 1 second, so that the surface temperature and the internal temperature of the powder piece are balanced, the crack rate of the powder piece is effectively reduced, the product percent of pass is improved, the powder piece is more finely and uniformly organized, and high hardness and high strength can be still obtained.
2. According to the powder piece heat treatment processing technology, the powder piece is innovatively placed into quenching liquid to be cooled for 5 seconds, the powder piece is cooled to 40-50 ℃ at normal temperature and taken out, a dangerous cracking area is broken away, the crack rate of the powder piece is effectively reduced, the hardness and the strength of a workpiece are improved, the powder piece after heat treatment has large internal stress, tempering treatment at 150 ℃ for 3min is required within 4 hours after the powder piece is produced, the internal stress of the powder piece is eliminated, the tissue stability is improved, the mechanical property of the workpiece is adjusted, the size of the workpiece is stabilized, and the reject ratio is reduced.
Detailed Description
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a heat treatment processing technology for powder pieces comprises the following steps:
s1, heating, namely heating to 850-900 ℃ within 1 second by using a current generated by an induction coil through a magnetic field in a high-frequency process at normal temperature, instantaneously heating the powder piece to 900 ℃, and keeping for 1 second;
s2, cooling air, stopping heating by the high-frequency machine, enabling the powder piece to stay in the air, and naturally cooling the powder piece in the air for 1 second, so that heating is finished before oxidation, the internal and external fall range of the powder piece tissue is shortened, and cracks are avoided;
s3, tempering, namely taking out the powder piece after air cooling, and putting the powder piece into quenching liquid to cool the powder piece in the quenching liquid for 5 seconds;
s4, cooling, namely cooling the cooled powder piece to 40-50 ℃ at normal temperature, taking out, jumping out of a dangerous cracking area, reducing the cracking rate of the powder piece, improving the hardness and strength of the powder piece, innovatively increasing the instant temperature of the powder piece to 900 ℃, lasting for 1 second, and finishing heating before unoxidization; and placing the heated powder piece in the air for natural cooling for 1 second, so that the surface temperature and the internal temperature of the powder piece are balanced, and the crack rate of the powder piece is effectively reduced.
The powder piece in the third step needs to be treated within 4 hours after the powder piece is produced, the powder piece is innovatively placed into quenching liquid to be cooled for 5 seconds, the powder piece is cooled to 40-50 ℃ at normal temperature and taken out, a dangerous cracking area is broken away, the crack rate of the powder piece is effectively reduced, the hardness and the strength of the workpiece are improved, the tempering temperature of the powder piece in the third step is 150 ℃, the tempering time of the powder piece in the third step is 3min, and the powder piece after heat treatment has large internal stress, so that the tempering treatment at 150 ℃ for 3min is needed within 4 hours after the powder piece is produced, the internal stress of the powder piece is eliminated, the tissue stability is improved, the mechanical property of the workpiece is adjusted, the size of the workpiece is stabilized, and the reject ratio is reduced.
In the first step, the powder piece is preheated during heating, the output power is reduced by 50%, the preheating action is firstly carried out to improve the rapid heating situation, the powder piece is preheated in a high-frequency machine to be heated to 300-500 ℃, the preheating reduces the temperature difference of the inner part and the outer part of the powder piece, the powder piece needs to be cooled after the preheating process, the high-frequency machine stops heating, the powder piece is naturally cooled in the air for 1-5 seconds, the natural cooling for 1 second can achieve a good effect, the temperature difference is not obviously reduced due to too short cooling time, the cooling time is too long, the preheating temperature is not enough, and energy is wasted; air cooling to expand the temperature to the internal structure and shorten the internal and external fall range.
The working principle is that the processing technology for carrying out heat treatment on the powder piece comprises the following steps: outputting electric power, heating (1 second), cooling (5 seconds), air cooling (1 second), tempering (5 seconds), and cooling (40-50 degrees).
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A powder piece heat treatment processing technology is characterized in that: the method comprises the following steps:
s1, heating, namely heating to 850-900 ℃ within 1 second by using a current generated by an induction coil through a magnetic field in a high-frequency process at normal temperature, instantaneously heating the powder piece to 900 ℃, and keeping for 1 second;
s2, cooling air, stopping heating by the high-frequency machine, enabling the powder piece to stay in the air, and naturally cooling the powder piece in the air for 1 second, so that heating is finished before oxidation, the internal and external fall range of the powder piece tissue is shortened, and cracks are avoided;
s3, tempering, namely taking out the powder piece after air cooling, and putting the powder piece into quenching liquid to cool the powder piece in the quenching liquid for 5 seconds;
and S4, cooling, namely cooling the cooled powder piece to 40-50 ℃ at normal temperature, taking out the powder piece, jumping out of a dangerous cracking area, reducing the cracking rate of the powder piece, and improving the hardness and strength of the powder piece.
2. The heat treatment process for powder pieces according to claim 1, wherein: in the third step, the tempering of the powder piece needs to be carried out within 4 hours after the powder piece is produced.
3. The heat treatment process for powder pieces according to claim 1, wherein: the tempering temperature of the powder piece in the third step is 150 ℃.
4. The heat treatment process for powder pieces according to claim 1, wherein: and the tempering time of the powder piece in the third step is 3 min.
5. The heat treatment process for powder pieces according to claim 1, wherein: in the first step, the powder piece is preheated during heating, the output power is reduced by 50%, the preheating operation is firstly carried out to improve the rapid heating condition, and the powder piece is preheated in a high-frequency machine to be heated to 300-500 ℃.
6. The heat treatment process for powder pieces according to claim 5, wherein: and cooling is needed after the preheating process, and the high-frequency machine stops heating, so that the powder piece is naturally cooled in the air for 1 to 5 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311398.0A CN113073180A (en) | 2021-03-24 | 2021-03-24 | Heat treatment processing technology for powder part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311398.0A CN113073180A (en) | 2021-03-24 | 2021-03-24 | Heat treatment processing technology for powder part |
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| Publication Number | Publication Date |
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| CN113073180A true CN113073180A (en) | 2021-07-06 |
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| CN202110311398.0A Pending CN113073180A (en) | 2021-03-24 | 2021-03-24 | Heat treatment processing technology for powder part |
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| CN (1) | CN113073180A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732699A (en) * | 2012-07-16 | 2012-10-17 | 鑫光热处理工业(昆山)有限公司 | Heat treatment process for powder part |
| CN105710375A (en) * | 2014-12-05 | 2016-06-29 | 青岛泰威机床有限公司 | Heat treatment process for powder piece |
| CN105755234A (en) * | 2014-12-13 | 2016-07-13 | 青岛勤德索具有限公司 | Heat treatment technology for powder part |
| CN106735243A (en) * | 2015-11-25 | 2017-05-31 | 青岛格润得新型材料有限公司 | Powder part Technology for Heating Processing |
| CN108127120A (en) * | 2017-12-26 | 2018-06-08 | 徐州三和机械零部件有限公司 | A kind of powder part heat treatment process |
| CN108145166A (en) * | 2016-12-05 | 2018-06-12 | 青岛小米星电子科技有限公司 | Powder part heat treatment process |
| CN111014682A (en) * | 2019-10-23 | 2020-04-17 | 广州市机电工业研究所 | Powdery stainless steel structure homogenization process |
| CN112222410A (en) * | 2020-09-25 | 2021-01-15 | 重庆市巨力冶金制品有限公司 | Preparation process of oil pump driving gear based on powder metallurgy press forming |
-
2021
- 2021-03-24 CN CN202110311398.0A patent/CN113073180A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732699A (en) * | 2012-07-16 | 2012-10-17 | 鑫光热处理工业(昆山)有限公司 | Heat treatment process for powder part |
| CN105710375A (en) * | 2014-12-05 | 2016-06-29 | 青岛泰威机床有限公司 | Heat treatment process for powder piece |
| CN105755234A (en) * | 2014-12-13 | 2016-07-13 | 青岛勤德索具有限公司 | Heat treatment technology for powder part |
| CN106735243A (en) * | 2015-11-25 | 2017-05-31 | 青岛格润得新型材料有限公司 | Powder part Technology for Heating Processing |
| CN108145166A (en) * | 2016-12-05 | 2018-06-12 | 青岛小米星电子科技有限公司 | Powder part heat treatment process |
| CN108127120A (en) * | 2017-12-26 | 2018-06-08 | 徐州三和机械零部件有限公司 | A kind of powder part heat treatment process |
| CN111014682A (en) * | 2019-10-23 | 2020-04-17 | 广州市机电工业研究所 | Powdery stainless steel structure homogenization process |
| CN112222410A (en) * | 2020-09-25 | 2021-01-15 | 重庆市巨力冶金制品有限公司 | Preparation process of oil pump driving gear based on powder metallurgy press forming |
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