CN111037218A - Processing technology of welding neck flange - Google Patents
Processing technology of welding neck flange Download PDFInfo
- Publication number
- CN111037218A CN111037218A CN201911247039.2A CN201911247039A CN111037218A CN 111037218 A CN111037218 A CN 111037218A CN 201911247039 A CN201911247039 A CN 201911247039A CN 111037218 A CN111037218 A CN 111037218A
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- blank
- roller
- driving roller
- flange
- neck
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a processing technology of a welding neck flange, which comprises the following processing steps: (1) selecting materials, namely selecting the specification of an aluminum alloy cast rod according to the specification of a welding neck flange, and ensuring that the height-diameter ratio of a blanked blank is less than or equal to 3; (2) taking a stepped blank with an annular cross section; (3) the outer diameter of the neck and the outer diameter of the bottom of the semi-finished product reach preset sizes; (4) the flange blank is continuously engaged into a closed hole formed by the driving roller and the core roller under the action of the rotating motion of the driving roller and the feeding motion of the core roller to generate continuous local plastic deformation, and the upper and lower pressing plates limit the axial flow of metal, so that the wall thickness of a rolled piece is reduced, the diameter of the rolled piece is enlarged, and the section profile is formed; (5) annealing; rough machining; and (6) finishing. The obtained welding neck flange has compact microstructure, refined crystal grains and obviously higher mechanical strength, wear resistance and fatigue life than other forging and machining methods; more importantly, the strict requirement of the ring rolling process on the shape of the blank is eliminated.
Description
Technical Field
The invention relates to the field of flange processing, in particular to a processing technology of a welding neck flange.
Background
The neck flange is a core component in pipeline connection in equipment fields such as petroleum, chemical engineering, urban water supply systems, electric power transmission systems and the like, and once the neck flange breaks down, leakage accidents can be caused, and serious consequences are caused. The neck of the hubbed flange is high and thin, and the difference between the upper section and the lower section is large, so that certain difficulty is brought to the forming of the hubbed flange. The production method commonly adopted at present is sand casting, forging and welding, the material utilization rate of the casting method is only 50% -60%, and the forming defects such as shrinkage cavities, looseness and the like are easily generated inside a casting, so that the service life and the safety of the welding neck flange are influenced; the quality of the hubbed flange formed by the forging method is good, but the defects of more production processes, high energy consumption, low production efficiency, large machining allowance and the like exist. In addition, a ring rolling method is adopted, although the ring rolling method has the advantages of high efficiency and material saving, because the neck of the high-neck flange is high and thin, and the requirement of ring rolling on the blank is high, the blank needs to be pre-forged into a complex shape such as a special-shaped section, a trial and error method is often adopted in actual production to obtain a rolled blank, and the end face is easy to generate forming defects such as fishtails in the rolling process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the processing technology of the welding neck flange, which has the advantages of high processing efficiency, high material utilization rate and easy control of product forming quality.
In order to achieve the aim of the invention, the invention adopts the specific scheme that:
a welding neck flange processing technology comprises the following processing steps:
(1) selecting materials, namely selecting the specification of an aluminum alloy cast rod according to the specification of a welding neck flange, and ensuring that the height-diameter ratio of a blanked blank is less than or equal to 3;
(2) taking a stepped blank with an annular cross section, wherein the stepped blank is divided into a neck part and a bottom part, uniformly heating the blank to 1000-1150 ℃, and then performing ring rolling on the blank in a ring rolling machine to obtain a semi-finished product;
(3) the outer diameter of the neck part and the outer diameter of the bottom part of the semi-finished product reach preset sizes, the inner diameter of the neck part is smaller than the preset sizes, the outer surface of the neck part is a straight surface, and the heights of the bottom part and the neck part of the semi-finished product are equal to the heights of the bottom part and the neck part when a blank is produced;
(4) the control of the metal axial flow of the rolled piece by the upper conical roller and the lower conical roller is replaced by adding pressing plates on the upper end surface and the lower end surface of the driving roller; the driving roller is a driving roller and performs rotary rolling movement; the core roller is a driven roller and performs driven rotary rolling motion and radial linear feeding motion; the flange blank is continuously engaged into a closed hole formed by the driving roller and the core roller under the action of the rotating motion of the driving roller and the feeding motion of the core roller to generate continuous local plastic deformation, and the upper and lower pressing plates limit the axial flow of metal, so that the wall thickness of a rolled piece is reduced, the diameter of the rolled piece is enlarged, and the section profile is formed;
(5) annealing; rough machining; and (6) finishing.
Further, the annealing is carried out at the temperature rising speed of less than or equal to 150 ℃/h from 0 ℃ and is carried out at the temperature of 600-650 ℃; the heating rate is controlled at 100-; the heat preservation time is generally calculated according to the thickness of each millimeter of board for 2-3min, but is not less than 1 h; preserving heat; and after the heat preservation is finished, cooling is started, the cooling speed is controlled to be less than or equal to 150 ℃/h, and the air can be naturally cooled in the static air until the temperature is reduced to be below 100 ℃.
The invention has the beneficial effects that:
the obtained welding neck flange has compact microstructure, refined crystal grains and obviously higher mechanical strength, wear resistance and fatigue life than other forging and machining methods; more importantly, the strict requirement of the ring rolling process on the shape of the blank is eliminated, the fishtail defect caused in the traditional ring rolling process is avoided, the neck forming quality is easier to control, the forming quality and the material utilization rate are improved, and the cost is reduced.
Detailed Description
The present invention is further described below by way of specific examples, but the present invention is not limited to only the following examples. Variations, combinations, or substitutions of the invention, which are within the scope of the invention or the spirit, scope of the invention, will be apparent to those of skill in the art and are within the scope of the invention.
A welding neck flange processing technology comprises the following processing steps:
(1) selecting materials, namely selecting the specification of an aluminum alloy cast rod according to the specification of a welding neck flange, and ensuring that the height-diameter ratio of a blanked blank is less than or equal to 3;
(2) taking a stepped blank with an annular cross section, wherein the stepped blank is divided into a neck part and a bottom part, uniformly heating the blank to 1000-1150 ℃, and then performing ring rolling on the blank in a ring rolling machine to obtain a semi-finished product;
(3) the outer diameter of the neck part and the outer diameter of the bottom part of the semi-finished product reach preset sizes, the inner diameter of the neck part is smaller than the preset sizes, the outer surface of the neck part is a straight surface, and the heights of the bottom part and the neck part of the semi-finished product are equal to the heights of the bottom part and the neck part when a blank is produced;
(4) the control of the metal axial flow of the rolled piece by the upper conical roller and the lower conical roller is replaced by adding pressing plates on the upper end surface and the lower end surface of the driving roller; the driving roller is a driving roller and performs rotary rolling movement; the core roller is a driven roller and performs driven rotary rolling motion and radial linear feeding motion; the flange blank is continuously engaged into a closed hole formed by the driving roller and the core roller under the action of the rotating motion of the driving roller and the feeding motion of the core roller to generate continuous local plastic deformation, and the upper and lower pressing plates limit the axial flow of metal, so that the wall thickness of a rolled piece is reduced, the diameter of the rolled piece is enlarged, and the section profile is formed;
(5) annealing; rough machining; and (6) finishing.
The annealing is carried out at the temperature rising speed of less than or equal to 150 ℃/h from 0 ℃ and is carried out at the temperature rising speed of 600-650 ℃; the heating rate is controlled at 100-; the heat preservation time is generally calculated according to the thickness of each millimeter of board for 2-3min, but is not less than 1 h; preserving heat; and after the heat preservation is finished, cooling is started, the cooling speed is controlled to be less than or equal to 150 ℃/h, and the air can be naturally cooled in the static air until the temperature is reduced to be below 100 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. A welding neck flange processing technology is characterized by comprising the following processing steps:
(1) selecting materials, namely selecting the specification of an aluminum alloy cast rod according to the specification of a welding neck flange, and ensuring that the height-diameter ratio of a blanked blank is less than or equal to 3;
(2) taking a stepped blank with an annular cross section, wherein the stepped blank is divided into a neck part and a bottom part, uniformly heating the blank to 1000-1150 ℃, and then performing ring rolling on the blank in a ring rolling machine to obtain a semi-finished product;
(3) the outer diameter of the neck part and the outer diameter of the bottom part of the semi-finished product reach preset sizes, the inner diameter of the neck part is smaller than the preset sizes, the outer surface of the neck part is a straight surface, and the heights of the bottom part and the neck part of the semi-finished product are equal to the heights of the bottom part and the neck part when a blank is produced;
(4) the control of the metal axial flow of the rolled piece by the upper conical roller and the lower conical roller is replaced by adding pressing plates on the upper end surface and the lower end surface of the driving roller; the driving roller is a driving roller and performs rotary rolling movement; the core roller is a driven roller and performs driven rotary rolling motion and radial linear feeding motion; the flange blank is continuously engaged into a closed hole formed by the driving roller and the core roller under the action of the rotating motion of the driving roller and the feeding motion of the core roller to generate continuous local plastic deformation, and the upper and lower pressing plates limit the axial flow of metal, so that the wall thickness of a rolled piece is reduced, the diameter of the rolled piece is enlarged, and the section profile is formed;
(5) annealing; rough machining; and (6) finishing.
2. The welding neck flange processing technology of claim 1, wherein the annealing is performed by controlling the temperature rise speed from 0 ℃ to less than or equal to 150 ℃/h, and keeping the temperature when the temperature rises to 600-650 ℃; the heating rate is controlled at 100-; the heat preservation time is generally calculated according to the thickness of each millimeter of board for 2-3min, but is not less than 1 h; preserving heat; and after the heat preservation is finished, cooling is started, the cooling speed is controlled to be less than or equal to 150 ℃/h, and the air can be naturally cooled in the static air until the temperature is reduced to be below 100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911247039.2A CN111037218A (en) | 2019-12-09 | 2019-12-09 | Processing technology of welding neck flange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911247039.2A CN111037218A (en) | 2019-12-09 | 2019-12-09 | Processing technology of welding neck flange |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111037218A true CN111037218A (en) | 2020-04-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911247039.2A Withdrawn CN111037218A (en) | 2019-12-09 | 2019-12-09 | Processing technology of welding neck flange |
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| Country | Link |
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| CN (1) | CN111037218A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227169A (en) * | 2021-12-23 | 2022-03-25 | 普乐（合肥）光技术有限公司 | Special high-voltage insulating flange for ion implanter and processing method |
| CN117600371A (en) * | 2024-01-17 | 2024-02-27 | 山西金正达金属制品有限公司 | Forging process of long-neck flange |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101885028A (en) * | 2010-07-01 | 2010-11-17 | 宁波大学 | Roll forming method for high-neck flange |
| CN104439030A (en) * | 2014-11-11 | 2015-03-25 | 连云港珍珠河石化管件有限公司 | Method for forging large-caliber welding neck flanges |
| CN104889681A (en) * | 2015-05-19 | 2015-09-09 | 宁波大学 | Method for processing welding neck flange |
| CN107186444A (en) * | 2017-06-28 | 2017-09-22 | 江阴普洋法兰有限公司 | A kind of hubbed flange processing technology |
-
2019
- 2019-12-09 CN CN201911247039.2A patent/CN111037218A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101885028A (en) * | 2010-07-01 | 2010-11-17 | 宁波大学 | Roll forming method for high-neck flange |
| CN104439030A (en) * | 2014-11-11 | 2015-03-25 | 连云港珍珠河石化管件有限公司 | Method for forging large-caliber welding neck flanges |
| CN104889681A (en) * | 2015-05-19 | 2015-09-09 | 宁波大学 | Method for processing welding neck flange |
| CN107186444A (en) * | 2017-06-28 | 2017-09-22 | 江阴普洋法兰有限公司 | A kind of hubbed flange processing technology |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227169A (en) * | 2021-12-23 | 2022-03-25 | 普乐（合肥）光技术有限公司 | Special high-voltage insulating flange for ion implanter and processing method |
| CN114227169B (en) * | 2021-12-23 | 2024-06-07 | 普乐（合肥）光技术有限公司 | Special high-voltage insulating flange for ion implanter and processing method |
| CN117600371A (en) * | 2024-01-17 | 2024-02-27 | 山西金正达金属制品有限公司 | Forging process of long-neck flange |
| CN117600371B (en) * | 2024-01-17 | 2024-04-09 | 山西金正达金属制品有限公司 | Forging process of long-neck flange |
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Application publication date: 20200421 |