CN112322874B - Forging strengthening and shaping process of nodular iron casting - Google Patents
Forging strengthening and shaping process of nodular iron casting Download PDFInfo
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- CN112322874B CN112322874B CN202011230475.1A CN202011230475A CN112322874B CN 112322874 B CN112322874 B CN 112322874B CN 202011230475 A CN202011230475 A CN 202011230475A CN 112322874 B CN112322874 B CN 112322874B
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- forging
- strengthening
- nodular iron
- casting
- shaping
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- 238000005266 casting Methods 0.000 title claims abstract description 82
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 74
- 238000005242 forging Methods 0.000 title claims abstract description 61
- 238000005728 strengthening Methods 0.000 title claims abstract description 41
- 238000007493 shaping process Methods 0.000 title claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 239000011777 magnesium Substances 0.000 claims description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 11
- 238000000137 annealing Methods 0.000 claims description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 7
- 229910052796 boron Inorganic materials 0.000 claims description 7
- 239000000084 colloidal system Substances 0.000 claims description 7
- 238000004513 sizing Methods 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 4
- 238000003754 machining Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- 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
Abstract
A process for strengthening and shaping the nodular iron casting includes such steps as heating the nodular iron casting to 800 deg.C, forging in closed forging die with demoulding agent to obtain blank of nodular iron casting, and near-net shaping by forging to reduce machining cost, compact strengthening of nodular iron casting, and eliminating internal defects.
Description
Technical Field
The invention relates to the technical field of forging, in particular to a forging strengthening and shaping process of a nodular iron casting.
Background
The nodular cast iron is a high-strength cast iron material and has higher strength than carbon steel, so that the nodular cast iron parts are generally produced by adopting a casting mode in industry, but the shape precision and the size precision of a casting process manufactured product are low, the control of the casting process is complex, and the casting product generally has inevitable defects, mainly shrinkage cavity, shrinkage porosity and the like, which influence the casting yield.
The forging process is a processing process for applying pressure to a metal blank by using forging pressure processing equipment to enable the metal blank to generate plastic deformation so as to obtain a forge piece with a certain shape and size, internal defects of a product in the forging process are eliminated, crystal grains are refined, and mechanical properties are improved.
Disclosure of Invention
In order to solve the problems, the invention provides a forging strengthening and shaping process for nodular iron castings.
The purpose of the invention is realized by the following technical scheme.
A technology for forging and strengthening the nodular cast iron includes such steps as heating the nodular cast iron to 800 deg.C, and forging and strengthening in closed forging die with demoulding agent sprayed on it by a deforming amount not less than 1% and not more than 15%.
According to the forging strengthening and shaping process of the nodular iron castings, after the forging strengthening and shaping, the size precision of the nodular iron castings meets the use requirement of finished products.
The forging strengthening and shaping process of the ductile iron casting has the deformation not less than 3% and not more than 8%.
The forging strengthening and shaping process of the ductile iron casting comprises the following specific steps of:
step 1, directly demoulding the nodular iron casting at a temperature below 400 ℃ and above 200 ℃ after the casting is finished;
step 2, putting the nodular iron castings demoulded in the step 1 into a heating furnace or a heat treatment furnace, heating to 800-1100 ℃, clamping into a closed forging die sprayed with a demoulding agent, forging, strengthening and shaping with the deformation not less than 1% and not more than 15%, and keeping the pressure for not less than 0.5min, wherein the demoulding agent is an Mg-containing demoulding agent;
step 3, opening the mold after pressure maintaining is finished, and taking out the nodular iron casting;
and 4, carrying out heat treatment on the nodular iron casting.
In the forging strengthening and shaping process of the ductile iron casting, the demolding temperature in the step 1 is 300 ℃.
In the forging strengthening and sizing process of the nodular iron casting, the Mg-containing release agent in the step 2 is prepared by adding magnesium powder into a boron nitride-graphite colloid release agent.
According to the forging strengthening and shaping process of the nodular iron casting, the addition amount of the magnesium powder in the Mg-containing release agent is 5-10%.
In the forging strengthening and shaping process of the ductile iron casting, the pressure maintaining time in the step 2 is 1-2 min.
In the forging strengthening and shaping process of the ductile iron castings, in the step 4, the heat treatment comprises one or more of annealing, normalizing and modulating.
According to the forging strengthening and sizing process of the nodular iron casting, the nodular iron casting is a revolving body part. The invention has the beneficial effects that:
the forging strengthening and shaping process of the nodular iron casting heats the nodular iron casting which is cast and shaped to the temperature of more than 800 ℃, forging strengthening shaping with the deformation not less than 1% and not more than 15% is carried out in a closed forging die sprayed with a release agent, thereby realizing that the blank of the nodular iron casting part is obtained by using a casting process, and the forging process is used for carrying out final near net shaping (different from 'shape correction' in the forging process), not only reducing the machining cost, but also carrying out compact strengthening on the nodular iron casting to eliminate internal defects, by reasonably controlling the forging deformation and the components of the release agent, the spheroidal graphite in the spheroidal graphite cast iron member is ensured not to deform, the spheroidal graphite cast iron structure on the surface is not degraded, at higher forging temperatures, there is no reduction in internal properties and in surface strength and corrosion resistance.
Detailed Description
A technology for forging and strengthening the nodular iron castings includes such steps as heating the ring nodular iron castings to 800 deg.C, forging and strengthening in closed forging die with demoulding agent sprayed on it by a rate of deformation not lower than 1% and not higher than 15%, preferably not lower than 3% and not higher than 10%, and forging and strengthening to obtain the nodular iron castings with high size precision.
The method comprises the following specific steps:
step 1, directly demoulding the nodular iron casting at a temperature below 400 ℃ and above 200 ℃ after the casting is finished;
step 2, putting the nodular iron castings demoulded in the step 1 into a heating furnace or a heat treatment furnace, heating to 800-1100 ℃, clamping into a closed forging die sprayed with a demoulding agent, forging, strengthening and shaping with the deformation not lower than 1% and not more than 15%, and keeping the pressure for not less than 0.5min, wherein the demoulding agent is a mould releasing agent containing Mg and is prepared by adding magnesium powder into a boron nitride-graphite colloid demoulding agent (the graphite content is less than or equal to 30%);
step 3, opening the mold after pressure maintaining is finished, and taking out the nodular iron casting;
and 4, annealing the nodular iron casting.
Example 1
Step 1, directly demoulding the nodular iron casting at about 300 ℃ after the casting is finished;
step 2, putting the nodular iron castings demoulded in the step 1 into a heating furnace, heating to 850 ℃, clamping the nodular iron castings into a closed forging die sprayed with a demoulding agent to perform forging strengthening shaping with the deformation of 5%, and maintaining the pressure for 1.5min, wherein the demoulding agent is a Mg-containing demoulding agent and is prepared by adding magnesium powder into a boron nitride-graphite colloid demoulding agent (the graphite content is less than or equal to 30%), and the adding amount of the magnesium powder into the Mg-containing demoulding agent is 5%;
step 3, opening the mold after pressure maintaining is finished, and taking out the nodular iron casting;
and 4, annealing the nodular iron casting.
Example 2
Step 1, directly demoulding the nodular iron casting at about 300 ℃ after the casting is finished;
step 2, putting the nodular iron castings demoulded in the step 1 into a heating furnace, heating to 950 ℃, clamping the nodular iron castings into a closed forging die sprayed with a demoulding agent to perform forging strengthening shaping with the deformation of 8%, and maintaining the pressure for 1.5min, wherein the demoulding agent is a Mg-containing demoulding agent and is prepared by adding magnesium powder into a boron nitride-graphite colloid demoulding agent (the graphite content is less than or equal to 30%), and the adding amount of the magnesium powder in the Mg-containing demoulding agent is 7%;
step 3, opening the mold after pressure maintaining is finished, and taking out the nodular iron casting;
and 4, annealing the nodular iron casting.
Example 3
Step 1, directly demoulding the nodular iron casting at about 300 ℃ after the casting is finished;
step 2, putting the nodular iron castings demoulded in the step 1 into a heating furnace, heating to 1050 ℃, clamping the nodular iron castings into a closed forging die sprayed with a demoulding agent to perform forging strengthening shaping with the deformation of 10%, and maintaining the pressure for 1.5min, wherein the demoulding agent is a Mg-containing demoulding agent and is prepared by adding magnesium powder into a boron nitride-graphite colloid demoulding agent (the graphite content is less than or equal to 30%), and the adding amount of the magnesium powder in the Mg-containing demoulding agent is 7%;
step 3, opening the mold after pressure maintaining is finished, and taking out the nodular iron casting;
and 4, annealing the nodular iron casting.
Comparative example 1
Step 1, directly demoulding the nodular iron casting at about 300 ℃ after the casting is finished;
2, putting the nodular iron casting demoulded in the step 1 into a heating furnace, heating to 1050 ℃, clamping into a closed forging die sprayed with a demoulding agent, forging and strengthening for shaping with the deformation of 10%, and maintaining the pressure for 1.5min, wherein the demoulding agent is a boron nitride-graphite colloid demoulding agent (the graphite content is less than or equal to 30%);
step 3, opening the mold after pressure maintaining is finished, and taking out the nodular iron casting;
and 4, annealing the nodular iron casting.
The castings of the above examples 1-3 and the comparative example 1 are annular parts cast by furan resin sand, after forging, strengthening and shaping the annular nodular iron casting, the outer diameter and the roundness both meet the error requirements of a finished product, and the inner diameter meets the precision requirement before machining, so that only the machining of a subsequent structure is needed for the inner diameter, the tensile strength of the samples of the examples 1-3 is improved compared with that of the cast part without forging before and after annealing, and it can be determined that no degradation of a spheroidized structure occurs, the tensile strength of the product of the comparative example 1 before annealing is reduced, and the difference after annealing is reduced but still cannot be eliminated, which indicates that the obvious degradation of the spheroidized structure exists.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A forging strengthening and shaping process of nodular iron castings is characterized in that the nodular iron castings which are cast and shaped are heated to a temperature of above 800 ℃, and forging strengthening and shaping with the deformation amount not less than 1% and not more than 15% are carried out in a closed forging die sprayed with a release agent;
after forging strengthening and shaping, the size precision of the nodular iron casting reaches the use requirement of a finished product;
the release agent is an Mg-containing release agent, the Mg-containing release agent is prepared by adding magnesium powder into a boron nitride-graphite colloid release agent, and the addition amount of the magnesium powder in the Mg-containing release agent is 5% -10%.
2. The forging strengthening shaping process of nodular iron castings according to claim 1, characterized in that the deformation is not less than 3% and not more than 10%.
3. The forging, strengthening and sizing process for the ductile iron castings according to claim 1, characterized by comprising the following specific steps:
step 1, directly demoulding the nodular iron casting at a temperature below 400 ℃ and above 200 ℃ after the casting is finished;
step 2, putting the nodular iron castings demoulded in the step 1 into a heating furnace or a heat treatment furnace, heating to 800-1100 ℃, clamping into a closed forging die sprayed with a demoulding agent, forging, strengthening and shaping with the deformation not less than 1% and not more than 15%, and keeping the pressure for not less than 0.5 min;
step 3, opening the mold after pressure maintaining is finished, and taking out the nodular iron casting;
and 4, carrying out heat treatment on the nodular iron casting.
4. The forging strengthening shaping process of nodular iron castings according to claim 3, wherein the demoulding temperature in step 1 is 300 ℃.
5. The forging strengthening and sizing process for nodular iron castings according to claim 3, wherein the dwell time in step 2 is 1-2 min.
6. The forging strengthening shaping process of nodular iron castings according to claim 3, wherein the heat treatment in step 4 comprises one or more of annealing, normalizing and conditioning.
7. The forging, strengthening and sizing process of the ductile iron casting according to claim 1, wherein the ductile iron casting is a revolving body part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011230475.1A CN112322874B (en) | 2020-11-06 | 2020-11-06 | Forging strengthening and shaping process of nodular iron casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011230475.1A CN112322874B (en) | 2020-11-06 | 2020-11-06 | Forging strengthening and shaping process of nodular iron casting |
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| Publication Number | Publication Date |
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| CN112322874A CN112322874A (en) | 2021-02-05 |
| CN112322874B true CN112322874B (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011230475.1A Active CN112322874B (en) | 2020-11-06 | 2020-11-06 | Forging strengthening and shaping process of nodular iron casting |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57126914A (en) * | 1981-01-29 | 1982-08-06 | Kawasaki Steel Corp | Production of forged roll for use in hot-rolling |
| CN1265133A (en) * | 1997-07-22 | 2000-08-30 | 通用汽车公司 | Lubrication system for hot forming |
| CN107186157A (en) * | 2017-06-14 | 2017-09-22 | 吉林大学 | The casting forging combination technological method of non-hardened and tempered steel Crank Blank |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013173183A (en) * | 2012-01-23 | 2013-09-05 | Yushiro Chemical Industry Co Ltd | Die release agent composition |
-
2020
- 2020-11-06 CN CN202011230475.1A patent/CN112322874B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57126914A (en) * | 1981-01-29 | 1982-08-06 | Kawasaki Steel Corp | Production of forged roll for use in hot-rolling |
| CN1265133A (en) * | 1997-07-22 | 2000-08-30 | 通用汽车公司 | Lubrication system for hot forming |
| CN107186157A (en) * | 2017-06-14 | 2017-09-22 | 吉林大学 | The casting forging combination technological method of non-hardened and tempered steel Crank Blank |
Non-Patent Citations (1)
| Title |
|---|
| 球墨铸铁铸锻联合成形新工艺;孙爱学等;《锻压技术》;19821015(第5期);第19-27页 * |
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| CN112322874A (en) | 2021-02-05 |
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Address after: 276000 south of national highway 206, Shangyan Town, Lanling County, Linyi City, Shandong Province Applicant after: Guoming Casting Pipe Co.,Ltd. Address before: 276000 south of national highway 206, Shangyan Town, Lanling County, Linyi City, Shandong Province Applicant before: SHANDONG GUOMING DUCTILEIRON PIPES TECHNOLOGY Co.,Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A forging strengthening and shaping process for ductile iron castings Effective date of registration: 20231107 Granted publication date: 20220826 Pledgee: Bank of China Limited Lanling Branch Pledgor: Guoming Casting Pipe Co.,Ltd. Registration number: Y2023980064369 |
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