CN114934167A - Composite heat treatment process of induction heating and pit furnace heating - Google Patents
Composite heat treatment process of induction heating and pit furnace heating Download PDFInfo
- Publication number
- CN114934167A CN114934167A CN202210559436.9A CN202210559436A CN114934167A CN 114934167 A CN114934167 A CN 114934167A CN 202210559436 A CN202210559436 A CN 202210559436A CN 114934167 A CN114934167 A CN 114934167A
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- China
- Prior art keywords
- heating
- heat treatment
- induction heating
- workpiece
- placing
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 87
- 230000006698 induction Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000002131 composite material Substances 0.000 title claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000005496 tempering Methods 0.000 claims abstract description 22
- 238000004321 preservation Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010791 quenching Methods 0.000 description 21
- 230000000171 quenching effect Effects 0.000 description 21
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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
- 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
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- 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)
- 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 relates to a composite heat treatment process of induction heating and pit furnace heating, which comprises the following heat treatment steps: s1, placing the workpiece in an induction furnace for heating; s2, placing the workpiece after induction heating in a preheated pit furnace for heating, and quickly cooling after heat preservation; and S3, placing the cooled workpiece in a tempering furnace, and performing heat preservation and then air cooling or water cooling. The invention can save the heating time of the workpiece, further save energy and improve the production efficiency of heat treatment.
Description
Technical Field
The invention relates to the field of heat treatment, in particular to a composite heat treatment process of induction heating and pit furnace heating.
Background
The heat treatment is an essential step after the metal workpiece is formed, and can improve mechanical properties such as hardness, toughness, tensile strength and the like of the workpiece. In actual production, quenching and tempering are commonly used as heat treatment means. The long shaft parts are usually quenched and heated by a pit furnace, the heating time is usually 1-3 hours or longer in order to obtain a certain austenite structure, the production efficiency is low, and the defects of thick oxide skin, decarburization and the like are easily formed.
The general quenching and tempering process of the current 40Cr long shaft part comprises the following steps: placing the workpiece in a preheated quenching well type furnace, and carrying out water cooling or oil cooling after heat preservation for a period of time; and (3) after the workpiece is cooled, placing the workpiece in a tempering pit furnace, and carrying out air cooling or water cooling after heat preservation for a period of time. However, since the workpiece enters the quenching pit furnace from room temperature, the workpiece needs to be heated in the furnace to the process set temperature for heat preservation. The heating process of the workpiece in the furnace is time-consuming, and the heat treatment production efficiency is influenced.
Disclosure of Invention
In order to solve the above problems of the prior art, the present invention is directed to: .
The invention provides a composite heat treatment process of induction heating and pit furnace heating, which comprises the following heat treatment steps:
s1, placing the workpiece in an induction furnace for heating;
s2, placing the workpiece after induction heating in a preheated quenching heat treatment furnace, and rapidly cooling after heat preservation;
and S3, placing the workpiece in a tempering shaft furnace, and performing air cooling or water cooling after heat preservation.
Further, the induction heating temperature is 870-910 ℃.
Further, the induction heating temperature was 890 ℃.
Furthermore, the hardness of the rear core part of the workpiece S3 is 42-50 HRC, and the hardness of the edge part is 42-48 HRC.
Further, the workpiece S3 has a post impact work of 111.5-133.5J.
Further, the induction heating frequency is 1500 Hz.
Further, the workpiece is 40Cr long-axis steel.
Further, the heat preservation temperature of S2 is 860 ℃, and the heat preservation time is 0.5 h.
Further, the temperature of the S3 is 580 ℃, and the holding time is 1.5 h.
The invention has the beneficial effects that: compared with the traditional tempering process, the quenching and heating time of the workpiece can be saved, and the obtained workpiece has better heat treatment effect, so that the traditional tempering process is improved, and the hardness, the impact energy and other mechanical properties of the obtained workpiece are obviously improved.
Detailed Description
The present invention will be described in further detail below in order to enable those skilled in the art to better understand the technical solution of the present invention.
The workpiece used in the invention is a 40Cr long shaft part; the hardening and tempering process requires the use of two heat treatment furnaces for quenching and tempering, respectively. The quenching pit furnace and the tempering pit furnace are adopted below to distinguish two heat treatment furnaces; the induction furnace frequency used was 1500 Hz.
The first embodiment is as follows:
s1, placing the 40Cr long-axis part in an induction furnace for heating, wherein the heating temperature is 870 ℃; s2, placing the heated 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 0.5h, and cooling with water; s3, placing the 40Cr long shaft part in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling with water.
Example two:
s1, placing the 40Cr long-shaft part in an induction furnace to be heated, wherein the heating temperature is 880 ℃; s2, placing the heated 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 0.5h, and cooling with water; s3, placing the 40Cr long shaft part in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling with water.
Example three:
s1, placing the 40Cr long-shaft part in an induction furnace for heating, wherein the heating temperature is 890 ℃; s2, placing the heated 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 0.5h, and cooling with water; s3, placing the 40Cr long shaft part in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling with water.
Example four:
s1, placing the 40Cr long-shaft part in an induction furnace to be heated, wherein the heating temperature is 900 ℃; s2, placing the heated 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 0.5h, and cooling with water; s3, placing the 40Cr long shaft part in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling with water.
Example five:
s1, placing the 40Cr long-shaft part in an induction furnace to be heated, wherein the heating temperature is 910 ℃; s2, placing the heated 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 0.5h, and cooling with water; and (3) taking out the S3 and 40Cr long shaft parts, placing the parts in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling by water.
Example six:
s1, placing the 40Cr long-shaft part in an induction furnace to be heated, wherein the heating temperature is 910 ℃; s2, placing the heated 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 1h, and cooling with water; and (3) taking out the S3 and 40Cr long shaft parts, placing the parts in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling by water.
Example seven:
s1, placing the 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 1.5h, and cooling with water; and (3) taking out the S2 and 40Cr long shaft parts, placing the parts in a tempering pit furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling by water.
Example eight:
s1, placing the 40Cr long shaft part in a quenching pit furnace, heating to 860 ℃ along with the furnace, preserving heat for 1.5h, and cooling by water; s2, taking out the 40Cr long shaft part, placing the part in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling with water.
TABLE 1
According to table 1, it can be seen from the first, seventh and eighth examples that the hardness and impact energy of the sample heated by induction are slightly higher than those of the sample heated with the furnace and the sample charged by the furnace, and the experimental data are better, however, the quenching time of the seventh and eighth examples exceeds the quenching time of the first example by 1 h. This is because the 40Cr long axis parts absorb heat during the temperature rise process with the furnace, resulting in a prolonged temperature rise time; in the process of charging the furnace in a warm state, the temperature of the 40Cr long-shaft part is also raised to 860 ℃ from room temperature, partial heat is absorbed, and the temperature rise time is prolonged. The sample heated by induction can reach the set temperature required by the quenching process within ten seconds, so that the production time is saved, and the heat treatment production efficiency is improved.
As can be seen from the first, second, third, fourth and fifth examples, the hardness and impact energy of the 40Cr long-axis part which is subjected to induction heating at 890 ℃ are better, so that the 890 ℃ is the better induction heating temperature of the 40Cr long-axis steel before quenching and tempering within the range of 870-910 ℃; the workpiece heated by 870 ℃ induction has better hardness and impact energy than the 40Cr long-axis part heated by 910 ℃, so that the 870 ℃ induction heating effect is better before tempering; it can be seen from the fifth and sixth examples that the hardness and impact energy of the long-axis part of the heat preservation 0.5h40Cr are better than those of the workpiece of the heat preservation 1h at the same induction heating temperature, so that the effect of the heat preservation 0.5h is better.
Furthermore, the preferred process for preparing the 40Cr long-axis part comprises the following steps: s1, placing the 40Cr long-shaft part in an induction furnace for heating, wherein the heating temperature is 890 ℃; s2, placing the heated 40Cr long shaft part in a quenching well type furnace preheated to 860 ℃, preserving heat for 0.5h, and cooling with water; and (3) taking out the S3 and 40Cr long shaft parts, placing the parts in a tempering well type furnace preheated to 580 ℃, preserving heat for 1.5h, and cooling by water. The 40Cr long shaft part produced by the process has the advantages of energy conservation, short time consumption, high efficiency and excellent performance.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A composite heat treatment process of induction heating and pit furnace heating is characterized by comprising the following heat treatment steps:
s1, placing the workpiece in an induction furnace for heating;
s2, placing the workpiece after induction heating in a preheated pit furnace, and quickly cooling after heat preservation;
and S3, placing the cooled workpiece in a tempering shaft furnace, and performing heat preservation and then air cooling or water cooling.
2. The combined heat treatment process of induction heating and shaft furnace heating as claimed in claim 1, wherein: the induction heating temperature is 870-910 ℃.
3. The combined heat treatment process of induction heating and shaft furnace heating as claimed in claim 2, wherein: the induction heating temperature was 890 ℃.
4. The combined heat treatment process of induction heating and shaft furnace heating as claimed in claim 1, wherein: the hardness of the rear center part of the workpiece S3 is 42-50 HRC, and the hardness of the edge part is 42-48 HRC.
5. The combined heat treatment process of induction heating and shaft furnace heating as claimed in claim 4, wherein: the post impact work of the workpiece S3 is 111.5-133.5J.
6. The combined heat treatment process of induction heating and shaft furnace heating as claimed in claim 1, wherein: the induction heating frequency is 1500 Hz.
7. The combined induction heating and shaft furnace heating heat treatment process of claim 4, wherein: the workpiece is a 40Cr long shaft part.
8. The combined heat treatment process of induction heating and shaft furnace heating as claimed in claim 1, wherein: and the heat preservation temperature of the S2 is 860 ℃, and the heat preservation time is 0.5 h.
9. The combined heat treatment process of induction heating and shaft furnace heating as claimed in claim 1, wherein: and the heat preservation temperature of the S3 is 580 ℃, and the heat preservation time is 1.5 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210559436.9A CN114934167A (en) | 2022-05-18 | 2022-05-18 | Composite heat treatment process of induction heating and pit furnace heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210559436.9A CN114934167A (en) | 2022-05-18 | 2022-05-18 | Composite heat treatment process of induction heating and pit furnace heating |
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| Publication Number | Publication Date |
|---|---|
| CN114934167A true CN114934167A (en) | 2022-08-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210559436.9A Pending CN114934167A (en) | 2022-05-18 | 2022-05-18 | Composite heat treatment process of induction heating and pit furnace heating |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423888A (en) * | 2008-10-31 | 2009-05-06 | 青特集团有限公司 | Whole heat treatment process of integral car axle |
| CN101948951A (en) * | 2010-09-26 | 2011-01-19 | 青特集团有限公司 | Integral heat treatment process of integrated axle |
| WO2018103088A1 (en) * | 2016-12-09 | 2018-06-14 | 孙振田 | Bearing steel heat treatment process |
| CN108728628A (en) * | 2018-07-02 | 2018-11-02 | 洛阳Lyc轴承有限公司 | A kind of 9Cr18 steel large diameter thin wall bearing ring heat treatment method |
| JP2019157166A (en) * | 2018-03-08 | 2019-09-19 | Ntn株式会社 | Work tempering process, and machine part obtained by said process |
-
2022
- 2022-05-18 CN CN202210559436.9A patent/CN114934167A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423888A (en) * | 2008-10-31 | 2009-05-06 | 青特集团有限公司 | Whole heat treatment process of integral car axle |
| CN101948951A (en) * | 2010-09-26 | 2011-01-19 | 青特集团有限公司 | Integral heat treatment process of integrated axle |
| WO2018103088A1 (en) * | 2016-12-09 | 2018-06-14 | 孙振田 | Bearing steel heat treatment process |
| JP2019157166A (en) * | 2018-03-08 | 2019-09-19 | Ntn株式会社 | Work tempering process, and machine part obtained by said process |
| CN108728628A (en) * | 2018-07-02 | 2018-11-02 | 洛阳Lyc轴承有限公司 | A kind of 9Cr18 steel large diameter thin wall bearing ring heat treatment method |
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Application publication date: 20220823 |
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