CN107937671A - A kind of heat treatment method of EMU rocking arm - Google Patents
A kind of heat treatment method of EMU rocking arm Download PDFInfo
- Publication number
- CN107937671A CN107937671A CN201711350983.1A CN201711350983A CN107937671A CN 107937671 A CN107937671 A CN 107937671A CN 201711350983 A CN201711350983 A CN 201711350983A CN 107937671 A CN107937671 A CN 107937671A
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- CN
- China
- Prior art keywords
- temperature
- rocking arm
- emu
- heat treatment
- treatment method
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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
-
- 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
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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 kind of heat treatment method of EMU rocking arm, including 1) quench：850 880 DEG C of temperature is heated to 50 100 DEG C/h of firing rate, keeps the temperature 3 8h in the temperature section, coming out of the stove air-cooled is pre-chilled to 800 DEG C or so；2) PAG cools down integral quenching in medium：3) circulation stirring cools down；4) it is tempered：520 580 DEG C of temperature is heated to 50 100 DEG C/h of firing rate, keeps the temperature 4 10h in the temperature section, then water cooling to room temperature.Tensile strength meets 900 1100MPa, yield strength >=850MPa, a hot material qualification rate more than 95%, none cracking after EMU rocking arm is heat-treated by the present invention.
Description
Technical field
The present invention relates to a kind of heat treatment method, more particularly to a kind of EMU that is used for connect torsion bar component and strut and tie group
The heat treatment method of the rocking arm of part.
Background technology
EMU connects torsion bar component and the rocking arm of tension and compression bar assembly, belongs to stress shaped piece, and product design uses
42CrMo materials, it is desirable to which tensile strength meets 900-1100MPa, yield strength >=850MPa, performance requirement height after heat treatment.Together
When since product structure is the solid forging by φ 110mm cylindrical-shaped structures and 40mm thin thick plate structure compositions, ensure it is high-strength
The lower embrittlement tendency of degree is very big, and strength range control range is narrow, and technique is difficult to control.
The content of the invention
Present invention aims at a kind of heat treatment method of EMU rocking arm is provided, qualification rate reaches after making its heat treatment
More than 95%, so as to solve the above problems.
To achieve the above object, the invention discloses a kind of heat treatment method of EMU rocking arm, include the following steps：
1) quench：Rocking arm is heated to 850-880 DEG C of temperature with 50-100 DEG C/h of firing rate, and 3- is kept the temperature in the temperature section
8h, comes out of the stove air-cooled to 750 DEG C -850 DEG C；
2) rocking arm after air-cooled, which is directly entered in PAG hardening medias, to be cooled down；
3) it is tempered：Cooling rear arm is heated to 520-580 DEG C of temperature with 50-100 DEG C/h of firing rate, in the temperature section
4-10h is kept the temperature, then water cooling to room temperature.
Further, in the step 1), 870 DEG C of temperature is heated to 80 DEG C/h of firing rate.
Further, in the step 1), heating coefficient 1.5-2.0min/mm.
Further, in the step 3), 560 DEG C of temperature is heated to 85 DEG C/h of firing rate.
Further, in the step 3), heating coefficient 2-2.5min/mm.
Further, in the step 2), temperature≤74 DEG C when the PAG hardening medias use.Compared with prior art,
The advantage of the invention is that：
Tensile strength meets 900-1100MPa after heat treatment, and yield strength >=850MPa, material is qualified after being once heat-treated
Rate more than 95%, none cracking.
Below with reference to accompanying drawings, the present invention is described in further detail.
Brief description of the drawings
The attached drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its explanation is used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic front view of EMU rocking arm disclosed in the preferred embodiment of the present invention；
Fig. 2 is the B-B schematic cross-sectional views of Fig. 1.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment 1：
42CrMo EMU is heated to 850 DEG C with rocking arm first, 3h is kept the temperature, is pre-chilled to more than 800 DEG C, in hardening media
Cooling；520 DEG C are heated to after finally 42CrMo EMU is quenched with rocking arm, 4h is kept the temperature, is cooled to room temperature.Performance is joined after testing
Number is shown in Table 1, meets technical requirements.
Table 1
| Tensile strength (MPa) | Yield strength (MPa) | Appearance detects |
| 1050 | 950 | It is qualified |
Embodiment 2：
42CrMo EMU is heated to 880 DEG C with rocking arm first, keeps the temperature 6h, is quenched, is cooled down in PAG hardening medias；Most
550 DEG C are heated to after 42CrMo EMU is quenched with rocking arm afterwards, 6h is kept the temperature, is cooled to room temperature.Performance parameter is shown in Table after testing
2, meet technical requirements.
Table 2
| Tensile strength (MPa) | Yield strength (MPa) | Appearance detects |
| 990 | 860 | It is qualified |
Embodiment 3：
42CrMo EMU is heated to 870 DEG C with rocking arm first, keeps the temperature 8h, is quenched, is cooled down in PAG hardening medias；Most
560 DEG C are heated to after 42CrMo EMU is quenched with rocking arm afterwards, 10h is kept the temperature, is cooled to room temperature.Performance parameter is shown in Table after testing
3, meet technical requirements.
Table 3
| Tensile strength (MPa) | Yield strength (MPa) | Appearance detects |
| 925 | 860 | It is qualified |
Technical scheme has been shown and described above.It should be understood by those skilled in the art that the present invention from
The limitation of above-described embodiment, the above embodiments and description only illustrate the principle of the present invention, is not departing from this hair
On the premise of bright spirit and scope, various changes and modifications of the present invention are possible, these changes and improvements both fall within claimed
The scope of the invention in.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (6)
1. a kind of heat treatment method of EMU rocking arm, it is characterised in that include the following steps：
1) quench：Rocking arm is heated to 850-880 DEG C of temperature with 50-100 DEG C/h of firing rate, keeps the temperature 3-8h in the temperature section, goes out
Stove is air-cooled to 750 DEG C -850 DEG C；
2) rocking arm after air-cooled, which is directly entered in PAG hardening medias, to be cooled down；
3) it is tempered：Cooling rear arm is heated to 520-580 DEG C of temperature with 50-100 DEG C/h of firing rate, is kept the temperature in the temperature section
4-10h, then water cooling to room temperature.
2. the heat treatment method of EMU rocking arm according to claim 1, it is characterised in that in the step 1), with
80 DEG C/h of firing rate is heated to 870 DEG C of temperature.
3. the heat treatment method of EMU rocking arm according to claim 1, it is characterised in that in the step 1), add
Hot coefficient is 1.5-2.0min/mm.
4. the heat treatment method of EMU rocking arm according to claim 1, it is characterised in that in the step 3), with
85 DEG C/h of firing rate is heated to 560 DEG C of temperature.
5. the heat treatment method of EMU rocking arm according to claim 1, it is characterised in that in the step 3), add
Hot coefficient is 2-2.5min/mm.
6. the heat treatment method of EMU rocking arm according to claim 1, it is characterised in that in the step 2), institute
State temperature≤74 DEG C when PAG hardening medias use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711350983.1A CN107937671A (en) | 2017-12-15 | 2017-12-15 | A kind of heat treatment method of EMU rocking arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711350983.1A CN107937671A (en) | 2017-12-15 | 2017-12-15 | A kind of heat treatment method of EMU rocking arm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107937671A true CN107937671A (en) | 2018-04-20 |
Family
ID=61944374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711350983.1A Pending CN107937671A (en) | 2017-12-15 | 2017-12-15 | A kind of heat treatment method of EMU rocking arm |
Country Status (1)
| Country | Link |
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| CN (1) | CN107937671A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116083821A (en) * | 2023-01-09 | 2023-05-09 | 天地上海采掘装备科技有限公司 | Preparation process of casting material of rocker arm shell of coal mining machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575666A (en) * | 2009-06-19 | 2009-11-11 | 洛阳Lyc轴承有限公司 | Heat processing technology for improving low-temperature impact work of 42CrMo bearing |
| CN101705342A (en) * | 2009-11-03 | 2010-05-12 | 洛阳Lyc轴承有限公司 | Heat treatment process for improving low-temperature impact work of 42CrMo bearing |
| CN103667615A (en) * | 2013-12-10 | 2014-03-26 | 中联重科股份有限公司 | Thermal treatment method of 42CrMo workpiece |
-
2017
- 2017-12-15 CN CN201711350983.1A patent/CN107937671A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575666A (en) * | 2009-06-19 | 2009-11-11 | 洛阳Lyc轴承有限公司 | Heat processing technology for improving low-temperature impact work of 42CrMo bearing |
| CN101705342A (en) * | 2009-11-03 | 2010-05-12 | 洛阳Lyc轴承有限公司 | Heat treatment process for improving low-temperature impact work of 42CrMo bearing |
| CN103667615A (en) * | 2013-12-10 | 2014-03-26 | 中联重科股份有限公司 | Thermal treatment method of 42CrMo workpiece |
Non-Patent Citations (2)
| Title |
|---|
| 安运静主编: "《热处理工艺学》", 31 July 1982 * |
| 薄鑫涛主编: "《实用热处理手册》", 30 April 2014 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116083821A (en) * | 2023-01-09 | 2023-05-09 | 天地上海采掘装备科技有限公司 | Preparation process of casting material of rocker arm shell of coal mining machine |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180420 |
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| RJ01 | Rejection of invention patent application after publication |