CN102773398B - Method for forging slender and thick-walled pipe fittings - Google Patents
Method for forging slender and thick-walled pipe fittings Download PDFInfo
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- CN102773398B CN102773398B CN201110118173.XA CN201110118173A CN102773398B CN 102773398 B CN102773398 B CN 102773398B CN 201110118173 A CN201110118173 A CN 201110118173A CN 102773398 B CN102773398 B CN 102773398B
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Abstract
The invention discloses a method for forging slender and thick-walled pipe fittings. The method is used for manufacturing pipe fittings which are not less than 4500 mm in length, not less than 700 mm in outer diameter and not less than 150 mm in wall thickness, and comprises a first step of heating a steel ingot to 1200+/-10 DEG C, discharging the steel ingot from a furnace after heat preservation, and drawing out the steel ingot to be 2930+/-5mm by using a 165MN hydraulic press; a second step of gas cutting to divide the material after the step of drawing out; a third step of returning workpieces to the furnace for heating, upsetting the workpieces by using the 165MN hydraulic press, wherein a forging ratio is 1.7, and punching the workpieces by using a puncher pin which is 500 mm in outer diameter; a fourth step of returning the workpieces to the furnace for heating, drawing out the workpieces to be 2/3 of a finishing size by using a 28MN hydraulic press and a thick mandrel which is 450 mm in outer diameter; and a fifth step of returning the workpieces to the furnace for heating, and drawing out the workpieces to the required finishing size by using the 28MN hydraulic press and a thin mandrel which is 400 mm in outer diameter. The performance of the pipe fittings manufactured by the method disclosed by the invention can meet the use requirements of unclear power equipment.
Description
Technical field
The present invention relates to a kind of forming method of pipe fitting, be specifically related to a kind of forging method of elongated heavier walled fitting.
Background technology
Pipe fitting is an Application comparison class part widely in industry, according to the difference of purposes, also has different requirements to the performance of pipe fitting.Especially the pipe fitting in petrochemical industry and nuclear power field, particularity of environment residing for it, has very high requirement to the performance of pipe fitting especially.
Pipe fitting generally adopts the method manufactures such as extruding, welding or casting to form, but for elongated heavier walled fitting, adopts this manufacture method to there is certain difficulty, and one is difficult on technique realizes, and two is be difficult to meet performance requirement.
The manufacture method also having a kind of pipe fitting first steel ingot is forged into the solid cylinder with cylindrical shell equal length, then with lathe boring, finally becomes cylindrical shell.The shortcoming of this manufacture method is, one is that stock utilization is low, and two is that mach amount is comparatively large, and cause the process-cycle very long, corresponding cost is also higher.
And the technological difficulties of elongated thick-wall cylinder moulding process are:
1, the internal diameter of cylindrical shell is less, if adopt the method for borehole on solid bar, because plug is comparatively thin, easy heat rises, and forging can shrink with the reduction of temperature, is easy to plug and forging are clipped together;
2, the length of the pulling plug that general diameter is less all can not be very long, main cause: one is that the long words of plug can unstability bend, and two is final lengths that the length of plug is less than cylinder forgings, and three is that cylinder forgings cooling is very fast, easily ftractures.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of forging method of elongated heavier walled fitting, and it can be not less than 4500mm by factory length, and external diameter is not less than 700mm, and wall thickness is not less than the pipe fitting of 150mm.
For solving the problems of the technologies described above, the technical solution of the forging method of the elongated heavier walled fitting of the present invention is:
Be not less than 4500mm for the manufacture of length, external diameter is not less than 700mm, and wall thickness is not less than the pipe fitting of 150mm, comprises the following steps:
The first step, by Heating Steel Ingots to 1200 ± 10 DEG C, is incubated and comes out of the stove after 12 ~ 15.5 hours; Adopt the pulling of 165MN hydraulic press to 2930 ± 5mm;
Second step, gas cutting sub-material after pulling;
3rd step, workpiece melts down and is heated to 1200 ± 10 DEG C, comes out of the stove after insulation; Adopt 165MN hydraulic press jumping-up, forging ratio is 1.7; Then the drift that external diameter is 500mm is used to carry out punching;
4th step, workpiece melts down and is heated to 1200 ± 10 DEG C, comes out of the stove after insulation; Adopting 28MN hydraulic press, is that the thick core bar drawing of 450mm is to 2/3 of finish size with external diameter;
5th step, workpiece melts down and is heated to 1200 ± 10 DEG C, comes out of the stove after insulation; Adopt 28MN hydraulic press, use the thin core bar drawing of 400 instead to the finish size required.
In the pulling process of described 4th, the 5th step, first workpiece two ends are pulled out final size, then pull out completion piecemeal with plug outer end.
The concrete grammar of described 5th step is, is inserted in the centre bore of workpiece by the thin plug of 400, first presses outer end, make the external diameter of outer end be 790mm; Then press the inner, make inner external diameter be 790 ± 5mm; Pulling, makes the length of workpiece be 4540 ± 10mm.
Total forging ratio of described 4th step and the 5th step is 4.5.
The technique effect that the present invention can reach is:
Adopt the pipe fitting manufactured by the present invention, its performance can meet the instructions for use of nuclear power generating equipment.
The present invention can be used for manufacturing the various elongate barrel forging such as main nuclear power pipeline, high temperature air-cooled pile pressure container item discharging ozzle adapter straight section.HTGR is a Main way of following Generation Ⅳ, and the production of discharging ozzle adapter straight section obviously can produce positive facilitation to the application of this technology.And be also similar pipeline member as the main pipeline of strength member in the AP1000 of Generation Ⅲ representative, obviously, adopt the present invention also can manufacture main pipeline straight tube, this will shorten the manufacturing cycle of main pipeline greatly, reduces production cost.The production of other similar pipeline members simultaneously also can adopt the present invention.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the schematic diagram of steel ingot of the present invention;
Fig. 2 first presses the schematic diagram behind outer end when being the pulling of the present invention's second time;
The schematic diagram behind the inner is pressed after when Fig. 3 is the pulling of the present invention's second time.
Detailed description of the invention
The forging method of the elongated heavier walled fitting of the present invention, be not less than 4500mm for the manufacture of length, external diameter is not less than 700mm, and wall thickness is not less than the pipe fitting of 150mm, comprises the following steps:
The first step, by the Heating Steel Ingots of 36 ~ 40 as shown in Figure 1 ton to 1200 DEG C, is incubated and comes out of the stove after 12 ~ 15.5 hours; Adopt the pulling of 165MN hydraulic press to 2930mm,
Second step, gas cutting sub-material after pulling;
3rd step, workpiece melts down and is heated to 1200 DEG C, comes out of the stove after insulation; Adopt 165MN hydraulic press jumping-up in circular shim, then use drift punching on drain cap that external diameter is 500mm, forging ratio is 1.7;
4th step, workpiece melts down and is heated to 1200 DEG C, comes out of the stove after insulation; Adopt 28MN hydraulic press, with external diameter be the thick core bar drawing of 450mm to 2/3 of finish size, i.e. about 3820mm;
5th step, workpiece melts down and is heated to 1200 DEG C, comes out of the stove after insulation; Adopt 28MN hydraulic press, use the thin core bar drawing of 400 instead to the finish size required;
In the pulling process of four, the 5th step, first with narrow anvil, workpiece two-port is pulled out final size, then pull out completion piecemeal with plug outer end;
Concrete grammar is as follows:
The thin plug of 400 is inserted in the centre bore of workpiece, first presses outer end (namely away from one end of plug end face), as shown in Figure 2, make the external diameter of outer end be 790mm;
Then press the inner, as shown in Figure 3, make inner external diameter be 790mm;
Pulling, makes the length of workpiece be 4540mm;
Heating can not be melted down in this pulling process;
Total forging ratio of the 4th step and the 5th step is 4.5.
Key of the present invention is double pulling, and the length that first time pulls out is 2/3 of finish size, and can meet when second time pulls out like this, the length after the pulling of two ends is just within the scope of plug length.Due to complete man-hour, the length of forging will be longer than plug, therefore plug can be easy to take out.
Adopt the pipe fitting manufactured by the present invention, after pipe fitting reaches process requirement, also have the potentiality continuing to extend, illustrate that the present invention can manufacture longer pipeline.
Adopt the pipe fitting manufactured by the present invention, compare the final size of forging and corresponding delivery gauge, mach surplus only has tens millimeters monolateral, greatly reduces amount of machining.
Adopt the pipe fitting manufactured by the present invention, its performance can meet the instructions for use of nuclear power generating equipment.
Claims (4)
1. a forging method for elongated heavier walled fitting, it is characterized in that: be not less than 4500mm for the manufacture of length, external diameter is not less than 700mm, and wall thickness is not less than the pipe fitting of 150mm, comprises the following steps:
The first step, by Heating Steel Ingots to 1200 ± 10 DEG C, is incubated and comes out of the stove after 12 ~ 15.5 hours; Adopt the pulling of 165MN hydraulic press extremely
Second step, gas cutting sub-material after pulling;
3rd step, workpiece melts down and is heated to 1200 ± 10 DEG C, comes out of the stove after insulation; Adopt 165MN hydraulic press jumping-up, forging ratio is 1.7; Then use external diameter is
drift carry out punching;
4th step, workpiece melts down and is heated to 1200 ± 10 DEG C, comes out of the stove after insulation; Adopt 28MN hydraulic press, with external diameter be
thick core bar drawing to 2/3 of finish size;
5th step, workpiece melts down and is heated to 1200 ± 10 DEG C, comes out of the stove after insulation; Adopt 28MN hydraulic press, use instead
thin core bar drawing to the finish size required.
2. the forging method of elongated heavier walled fitting according to claim 1, is characterized in that: in the pulling process of described 4th, the 5th step, first workpiece two ends are pulled out final size, then pull out completion piecemeal with plug outer end.
3. the forging method of elongated heavier walled fitting according to claim 1, is characterized in that: the concrete grammar of described 5th step is, will
thin plug insert in the centre bore of workpiece, first press outer end, make the external diameter of outer end be
then press the inner, make inner external diameter be
pulling, makes the length of workpiece be 4540 ± 10mm.
4. the forging method of elongated heavier walled fitting according to claim 1, is characterized in that: total forging ratio of described 4th step and the 5th step is 4.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110118173.XA CN102773398B (en) | 2011-05-09 | 2011-05-09 | Method for forging slender and thick-walled pipe fittings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110118173.XA CN102773398B (en) | 2011-05-09 | 2011-05-09 | Method for forging slender and thick-walled pipe fittings |
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| CN102773398A CN102773398A (en) | 2012-11-14 |
| CN102773398B true CN102773398B (en) | 2015-04-22 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174807B (en) * | 2013-05-22 | 2016-06-15 | 咸阳天成钛业有限公司 | The manufacture method of a kind of heavy caliber titanium thick-wall tube |
| CN104384430B (en) * | 2014-11-25 | 2016-06-22 | 张家港中环海陆特锻股份有限公司 | The Forging Technology of heavy wall high tubular ring forging |
| CN105728633A (en) * | 2014-12-10 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Forging method for large-diameter helicopter rotor shaft |
| CN106041427A (en) * | 2016-06-29 | 2016-10-26 | 宝钢特钢有限公司 | Production method of cylindrical forging |
| CN107363214B (en) * | 2017-07-13 | 2019-05-10 | 江阴南工锻造有限公司 | A kind of long valve body punching pulling forging technology |
| CN109127973A (en) * | 2017-09-29 | 2019-01-04 | 贵州安大航空锻造有限责任公司 | Cr13 type martensitic stain less steel heavy wall height cylinder ring forging forming method |
| CN111745120B (en) * | 2020-06-23 | 2021-08-13 | 河南中原特钢装备制造有限公司 | Forging method of wind tunnel cannon driving section pipe body |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954439A (en) * | 2010-08-17 | 2011-01-26 | 吉林省昊宇石化电力设备制造有限公司 | Forging method of AP1000 nuclear-power main pipeline forging piece |
| CN101987342A (en) * | 2009-08-07 | 2011-03-23 | 上海重型机器厂有限公司 | Forging method of tube sheet of nuclear power equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2661669B2 (en) * | 1988-07-14 | 1997-10-08 | エヌティエヌ株式会社 | Forming method of cylindrical member with flange |
| JP3594485B2 (en) * | 1998-06-30 | 2004-12-02 | 武蔵精密工業株式会社 | Molding method of hollow ball stud |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101987342A (en) * | 2009-08-07 | 2011-03-23 | 上海重型机器厂有限公司 | Forging method of tube sheet of nuclear power equipment |
| CN101954439A (en) * | 2010-08-17 | 2011-01-26 | 吉林省昊宇石化电力设备制造有限公司 | Forging method of AP1000 nuclear-power main pipeline forging piece |
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Effective date of registration: 20161123 Address after: 200245 Jiangchuan Road, Shanghai, No. 207, building 1800, No. Patentee after: Shanghai Electric Heavy Forging Co. Ltd. Patentee after: Shanghai Heavy Machines Plant Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy Machines Plant Co., Ltd. |