CN107460283B - A kind of high temperature straightening method of rich chromium cast iron casting - Google Patents
A kind of high temperature straightening method of rich chromium cast iron casting Download PDFInfo
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- CN107460283B CN107460283B CN201710697470.1A CN201710697470A CN107460283B CN 107460283 B CN107460283 B CN 107460283B CN 201710697470 A CN201710697470 A CN 201710697470A CN 107460283 B CN107460283 B CN 107460283B
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- casting
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- cast iron
- chromium cast
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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
- 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
- C21D5/00—Heat treatments of cast-iron
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- 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 high temperature straightening methods of rich chromium cast iron casting, the rich chromium cast iron casting that thickness is easily deformed after the rich chromium cast iron casting that 10-120mm is deformed or heat treatment, it is quenched by 960-1050 DEG C of high temperature, casting is placed on mold again, by press machine, pressure is in 5-15MPa, pressure maintaining 2-25min, one to twice, and by casting straightening, casting is air-cooled after straightening or water mist is cold.For the heating rate of the casting in 70-80 DEG C/h, Cr12-Cr19 material keeps the temperature 3-5h, and Cr20-Cr26 material keeps the temperature 4-5h, high temperature quenching.The present invention can reduce the rejection rate of casting by deformation amount controlling in≤2mm by deflection > 2.6mm of casting, by high temperature straightening, drop to 3% hereinafter, improve the hardness of casting by 35%, can be improved 2-3HRC, reduce the complexity of casting process design.
Description
Technical field
The present invention relates to rich chromium cast iron casting, the high temperature straightening method of especially a kind of rich chromium cast iron casting.
Background technique
High temperature cast iron is a kind of good anti-friction material, is widely used in coal mine machinery, electric machinery, farm machinery etc..
High temperature cast iron has very high hardness and wearability, but since high temperature cast iron is typical fragile material, impact flexibility is very
Difference, processing straightening is difficult,
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of technique can property, the good rich chromium cast iron casting of processing effect
High temperature straightening method.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that: a kind of high temperature tune of rich chromium cast iron casting
Histogram method, the rich chromium cast iron casting that thickness is easily deformed after the rich chromium cast iron casting that 10-120mm is deformed or heat treatment, passes through
960-1050 DEG C of high temperature quenching, then casting is placed on mold, by press machine, pressure is in 5-15MPa, pressure maintaining 2-25min, and one
To twice, by casting straightening, casting is air-cooled after straightening or water mist is cold.
For the heating rate of the casting in 70-80 DEG C/h, Cr12-Cr19 material keeps the temperature 3-5h, the heat preservation of Cr20-Cr26 material
4-5h, high temperature quenching.
960 DEG C of the casting Cr12-Cr19 material quenchings, 1050 DEG C of Cr20-Cr26 material quenchings.
Thickness d=10mm plate and Corkscrews casting, pressure is in 5-7MPa, pressure maintaining 2min, once；10 < d≤20mm are flat
Plate and Corkscrews casting, pressure is in 6-8MPa, and pressure maintaining 3min, one to twice；20 < d≤40mm plates and Corkscrews casting, pressure
Power is in 6-8MPa, and pressure maintaining 4-6min, one to twice；40 < d≤60mm plates and bar class casting, pressure is in 8-10MPa, pressure maintaining
10-15min, one to twice；60 < d≤80mm plates and bar class casting, pressure is in 9-12MPa, and pressure maintaining 15-20min, one arrives
Twice；80 < d≤120mm, plate and bar class casting, pressure is in 12-15MPa, and pressure maintaining 20-25min, one to twice.
The beneficial effects of the present invention are: by deflection > 2.6mm of casting, it can be by deformation amount controlling by high temperature straightening
In≤2mm, reduce the rejection rate of casting, by 35% drop to 3% hereinafter, improve casting hardness, 2-3HRC can be improved, reduce
The complexity of casting process design.
Specific embodiment
Invention is further described in detail With reference to embodiment:
The high temperature straightening method of rich chromium cast iron casting of the invention, thickness in the 10-120mm rich chromium cast iron casting deformed or
The rich chromium cast iron casting being easily deformed after heat treatment is quenched, then casting is placed on mold by 960-1050 DEG C of high temperature, is passed through
Press machine, pressure is in 5-15MPa, and pressure maintaining 2-25min, one to twice, and by casting straightening, casting is air-cooled after straightening or water mist is cold.
For the heating rate of the casting in 70-80 DEG C/h, Cr12-Cr19 material keeps the temperature 3-5h, the heat preservation of Cr20-Cr26 material
4-5h, high temperature quenching.
960 DEG C of the casting Cr12-Cr19 material quenchings, 1050 DEG C of Cr20-Cr26 material quenchings.
Thickness d=10mm plate and Corkscrews casting, pressure is in 5-7MPa, pressure maintaining 2min, once；10 < d≤20mm are flat
Plate and Corkscrews casting, pressure is in 6-8MPa, and pressure maintaining 3min, one to twice；20 < d≤40mm plates and Corkscrews casting, pressure
Power is in 6-8MPa, and pressure maintaining 4-6min, one to twice；40 < d≤60mm plates and bar class casting, pressure is in 8-10MPa, pressure maintaining
10-15min, one to twice；60 < d≤80mm plates and bar class casting, pressure is in 9-12MPa, and pressure maintaining 15-20min, one arrives
Twice；80 < d≤120mm, plate and bar class casting, pressure is in 12-15MPa, and pressure maintaining 20-25min, one to twice.
Embodiment 1
By casting thickness in 10mm, the Cr12 material casting of 1000 × 1000mm of shape, heating rate in 70-80 DEG C/h,
960 DEG C are warming up to, keeps the temperature 3h, high temperature quenching, then casting is placed on mold, by press machine, pressure is in 5MPa, pressure maintaining
2min, by casting straightening, casting is air-cooled after straightening or water mist is cold.
Embodiment 2
By casting thickness in 25mm, the Cr25 material casting of outer dimension long 800mm, wide 350mm, camber 220mm, heating
In 70-80 DEG C/h, 1050 DEG C are warming up to, keeps the temperature 4h, high temperature quenching, then casting is placed on mold, by press machine, pressure exists
8MPa, pressure maintaining 5min, twice, by casting straightening, casting is air-cooled after straightening or water mist is cold.
Embodiment 3
By casting thickness in 110mm, the Cr25 material casting of outer dimension long 1300mm, wide 350mm, camber 120mm are risen
Temperature is warming up to 1050 DEG C in 70-80 DEG C/h, keeps the temperature 5h, high temperature quenching, then casting is placed on mold, passes through press machine, pressure
In 13MPa, pressure maintaining 22min, by casting straightening, casting is air-cooled after straightening or water mist is cold.
The product for randomly selecting embodiment is tested, as a result as follows:
In conclusion the contents of the present invention are not limited in the above embodiments, the knowledgeable people in same area can
Can propose other embodiments easily within technological guidance's thought of the invention, but this embodiment is included in this hair
Within the scope of bright.
Claims (3)
1. a kind of high temperature straightening method of rich chromium cast iron casting, which is characterized in that the rich chromium cast iron that thickness is deformed in 10-120mm
The rich chromium cast iron casting being easily deformed after casting or heat treatment, is quenched, then casting is placed on mold by 960-1050 DEG C of high temperature
On, by press machine, pressure is in 5-15MPa, pressure maintaining 2-25min, and one to twice, by casting straightening, after straightening casting it is air-cooled or
Water mist is cold；Thickness d=10mm plate and Corkscrews casting, pressure is in 5-7MPa, pressure maintaining 2min, once；10 < d≤20mm plates
With Corkscrews casting, pressure is in 6-8MPa, and pressure maintaining 3min, one to twice；20 < d≤40mm plates and Corkscrews casting, pressure
In 6-8MPa, pressure maintaining 4-6min, one to twice；40 < d≤60mm plates and bar class casting, pressure is in 8-10MPa, pressure maintaining
10-15min, one to twice；60 < d≤80mm plates and bar class casting, pressure is in 9-12MPa, and pressure maintaining 15-20min, one arrives
Twice；80 < d≤120mm, plate and bar class casting, pressure is in 12-15MPa, and pressure maintaining 20-25min, one to twice.
2. the high temperature straightening method of rich chromium cast iron casting according to claim 1, which is characterized in that the heating speed of the casting
For degree in 70-80 DEG C/h, Cr12-Cr19 material keeps the temperature 3-5h, and Cr20-Cr26 material keeps the temperature 4-5h, high temperature quenching.
3. the high temperature straightening method of rich chromium cast iron casting according to claim 2, which is characterized in that the casting Cr12-
960 DEG C of Cr19 material quenchings, 1050 DEG C of Cr20-Cr26 material quenchings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710697470.1A CN107460283B (en) | 2017-08-15 | 2017-08-15 | A kind of high temperature straightening method of rich chromium cast iron casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710697470.1A CN107460283B (en) | 2017-08-15 | 2017-08-15 | A kind of high temperature straightening method of rich chromium cast iron casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107460283A CN107460283A (en) | 2017-12-12 |
| CN107460283B true CN107460283B (en) | 2019-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710697470.1A Active CN107460283B (en) | 2017-08-15 | 2017-08-15 | A kind of high temperature straightening method of rich chromium cast iron casting |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000026916A (en) * | 1998-07-10 | 2000-01-25 | Honda Motor Co Ltd | Heat treatment of metallic mold casting |
| CN105018683A (en) * | 2015-08-06 | 2015-11-04 | 潘桂枝 | 35CrMo sliding plate surface quenching process |
| CN105274306A (en) * | 2014-07-25 | 2016-01-27 | 天津市津靳农副产品专业合作社 | Heat treatment method-hanging method for high-chromium iron side protection plate |
| CN105274298A (en) * | 2014-07-25 | 2016-01-27 | 天津市津靳农副产品专业合作社 | Heat treatment method-double compression method for lining plate of shot blasting room of high-chromium iron shot blasting machine |
-
2017
- 2017-08-15 CN CN201710697470.1A patent/CN107460283B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000026916A (en) * | 1998-07-10 | 2000-01-25 | Honda Motor Co Ltd | Heat treatment of metallic mold casting |
| CN105274306A (en) * | 2014-07-25 | 2016-01-27 | 天津市津靳农副产品专业合作社 | Heat treatment method-hanging method for high-chromium iron side protection plate |
| CN105274298A (en) * | 2014-07-25 | 2016-01-27 | 天津市津靳农副产品专业合作社 | Heat treatment method-double compression method for lining plate of shot blasting room of high-chromium iron shot blasting machine |
| CN105018683A (en) * | 2015-08-06 | 2015-11-04 | 潘桂枝 | 35CrMo sliding plate surface quenching process |
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| CN107460283A (en) | 2017-12-12 |
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Effective date of registration: 20230103 Address after: 301699 280m south of Duliu Railway Station, Liangwangzhuang Township, Jinghai District, Tianjin Patentee after: Tianjin Wanzhong New Material Technology Co.,Ltd. Address before: Room 201, Block J, Haitai Green Industry Base, No. 6, Haitai Development, Huayuan Industrial Zone, Binhai New Area, Tianjin, 300384 Patentee before: TIANJIN WANLI XINSHENG NEW MATERIAL TECHNOLOGY RESEARCH INSTITUTE CO.,LTD. |
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