CN103042086A - Method for lowering formation external pressure tonnage of bellows expansion joint by reducing sectional area of cylinder - Google Patents
Method for lowering formation external pressure tonnage of bellows expansion joint by reducing sectional area of cylinder Download PDFInfo
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- CN103042086A CN103042086A CN2012105951894A CN201210595189A CN103042086A CN 103042086 A CN103042086 A CN 103042086A CN 2012105951894 A CN2012105951894 A CN 2012105951894A CN 201210595189 A CN201210595189 A CN 201210595189A CN 103042086 A CN103042086 A CN 103042086A
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- expansion joint
- circular shell
- shell ring
- sectional area
- external pressure
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000015572 biosynthetic process Effects 0.000 title abstract 2
- 238000003466 welding Methods 0.000 claims abstract description 33
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 20
- 238000007493 shaping process Methods 0.000 claims description 15
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000003032 molecular docking Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
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Abstract
The invention discloses a method for lowering formation external pressure tonnage of a bellows expansion joint by reducing sectional area of a cylinder. The method includes: feeding according to calculated size and installing and welding to form a tubular cylinder section; subjecting longitudinal weld joints of the tubular cylinder section to 100% X-ray nondestructive testing; evenly adjusting clearances, placing an upper die at the upper end of the tubular cylinder section; filling the tubular cylinder section with water by a nondestructive testing, and removing a middle pad of the die; and allowing a press to press down, holding pressure for certain minutes, removing the die, and finishing pressing of the expansion joint. The product is provided with no circular welds but longitudinal welds, welding stress is lowered, the effect of weld fatigue upon the expansion joint is lowered, product quality is increased, and the service life of the product is prolonged. By hydraulic integral forming compared with other forming methods, the surface of the expansion joint is scratchless, the appearance of the product is attractive, and appearance quality of the product is increased. By the use of the integral forming process, the requirement of forming for large hydraulic presses is avoided, the forming process is insusceptible to equipment limitations, and manufacturing can be performed based on the existing equipment.
Description
Technical field
The invention belongs to the FlexbleJoint technical field, relate in particular to a kind of the employing and reduce the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage.
Background technology
Corrugated-type expansion joint (or claiming FlexbleJoint) as the bit shift compensation element that a kind of good compensation produces owing to expanding with heat and contract with cold, is widely used at each industrial departments such as chemical industry, oil, electric power, metallurgy, shipbuilding, nuclear energy, aerospace.Along with the development of science and technology, large scale, high parameter, the application of heavy wall corrugated-type expansion joint on engineering are also more and more, so class expansion joint diameter is large, and wall thickness is thicker, and monolithic molding is very difficult.So, domestic expansion joint professional production factory all adopts the manufacturing process of single wavelength-division lobe forming welding to make at present, the expansion joint that produces not only has longitudinal seam, also has circumferential welded seam, wave number is more, circumferential welded seam is also just more, does not satisfy GB16749-1997 " pressure vessel corrugated-type expansion joint " expansion joint national standard and instructions for use.
The monolithic molding of DN3950 * 42mm hydraulic pressure monolithic molding expansion joint belongs to superplastic deformation, forming pressure is large, and the hydraulic press thrust of shaping demand is also very large, the forming pressure of DN3950 * 42mm hydraulic pressure monolithic molding expansion joint is 13～15.8MPa, and the blind plate power that need to overcome that is shaped as calculated is that 24000T is that hydraulic press thrust should be greater than 24000T.The existing equipment scarce capacity becomes again a great problem, and increasing device thrust is unrealistic, and the one, input cost is too large; The 2nd, device fabrication difficulty large period is long.
Summary of the invention
In order to address this problem, this programme has been invented a kind of the employing and has been reduced the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage, taked to reduce the scheme of shaping pressure thrust: the sectional area that reduces expansion joint, inside at expansion joint arranges inside lining sleeve, make the circular section of expansion joint be converted into anchor ring, the required blind plate power that overcomes reduces greatly during shaping.The blind plate power that shaping need to overcome has dropped to below the 12000T, makes existing equipment can satisfy forming requirements.
The embodiment of the invention is achieved in that a kind of method that adopts minimizing cylindrical shell sectional area to reduce bellows expansion joint shaping external pressure tonnage, and the method comprises:
According to the driven dimension blanking, the circular shell ring of assembly welding requires every butt weld all should through welding;
The vertical welding point of circular shell ring carries out the Non-Destructive Testing of 100%X ray, and the transillumination quality is not less than the AB level, and evaluation II level is qualified;
The circular shell ring of RT passed examination is vertically put into counterdie, and the attention gap should be mixed well, and then mold is put into circular shell ring upper-end part of driving;
Adopt hydraulic test pump water-filling in the circular shell ring, air is discharged from the cope match-plate pattern steam vent, treats circular shell ring at the intermediate die place slightly during projection, removes cushion block in the middle of the mould;
Hydraulic test pump continues to circular shell ring water-filling, and forcing press slowly presses down, and hydraulic test pump water-filling pressure and forcing press pressed down speed and will mate this moment, when treating that upper and lower each mould is combined together, hydraulic test pump stops the water-filling pressurization, and forcing press stops to press down, pressurize number minute is removed mould, and Expansion Joint Pressing is complete.
Further, according to the driven dimension blanking, the circular shell ring of assembly welding only allows the vertical welding point of docking, forbids to dock circle welding joint.
Further, the vertical welding point of circular shell ring carries out the Non-Destructive Testing of 100%X ray by JB/T4730-2005, and the transillumination quality is not less than the AB level, and evaluation II level is qualified.
Further, V-arrangement and O-ring seals are adopted in sealing between upper and lower mould and the circular shell ring.
The employing of this programme invention reduces the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage, at first according to the driven dimension blanking, the circular shell ring of assembly welding (only allow the vertical welding point of docking, forbid to dock circle welding joint) requires every butt weld all should through welding; The vertical welding point of circular shell ring carries out 100%X ray Non-Destructive Testing (RT detection) by JB/T4730-2005, and the transillumination quality is not less than the AB level, and evaluation II level is qualified; The circular shell ring of RT passed examination is vertically put into counterdie, and the attention gap should be mixed well, and then mold is put into circular shell ring upper-end part of driving.V-arrangement and O-ring seals are adopted in sealing between upper and lower mould and the circular shell ring; Adopt hydraulic test pump water-filling in the circular shell ring, air is discharged from the cope match-plate pattern steam vent, treats circular shell ring at the intermediate die place slightly during projection, removes cushion block in the middle of the mould; Hydraulic test pump continues to circular shell ring water-filling, and forcing press slowly presses down, and hydraulic test pump water-filling pressure and forcing press pressed down speed and will mate this moment, when treating that upper and lower each mould is combined together, hydraulic test pump stops the water-filling pressurization, and forcing press stops to press down, pressurize number minute is removed mould, and Expansion Joint Pressing is complete; The expansion joint linear side dimension adopts machine-tooled method to finish.
Product only has longitudinal seam, and does not have circumferential welded seam, and welding stress reduces, and has reduced because of the impact of weld fatigue on expansion joint, has improved product quality, prolongs its service life; Because expansion joint adopts the hydraulic pressure monolithic molding, compare the expansion joint surface with other manufacturing process (mechanical bulging or punching press etc.) without scratching, product design is attractive in appearance, has improved the product appearance quality; Integral forming process has been avoided being shaped to the demand of large hydraulic press (greater than 12000T), make forming process not be subjected to the limitation of equipment, can make on the basis of existing equipment (Y-12000T), solve a major-diameter thick-wall hydraulic pressure monolithic molding expansion joint production domesticization difficult problem.
Description of drawings
Fig. 1 is that the employing that the embodiment of the invention provides reduces the flow chart that the cylindrical shell sectional area reduces the method for bellows expansion joint shaping external pressure tonnage.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The employing that Fig. 1 shows the invention process case to be provided reduces the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage, and the method comprises:
In step S101, according to the driven dimension blanking, the circular shell ring of assembly welding (only allow the vertical welding point of docking, forbid to dock circle welding joint) requires every butt weld all should through welding;
In step S102, the vertical welding point of circular shell ring carries out 100%X ray Non-Destructive Testing (RT detection) by JB/T4730-2005, and the transillumination quality is not less than the AB level, and evaluation II level is qualified; In step S103, the circular shell ring of RT passed examination is vertically put into counterdie, and the attention gap should be mixed well, and then mold is put into circular shell ring upper-end part of driving.V-arrangement and O-ring seals are adopted in sealing between upper and lower mould and the circular shell ring;
In step S104, adopt hydraulic test pump water-filling in the circular shell ring, air is discharged from the cope match-plate pattern steam vent, treats circular shell ring at the intermediate die place slightly during projection, removes cushion block in the middle of the mould;
In step S105, hydraulic test pump continues to circular shell ring water-filling, forcing press slowly presses down, hydraulic test pump water-filling pressure and forcing press pressed down speed and will mate this moment, and when treating that upper and lower each mould is combined together, hydraulic test pump stops the water-filling pressurization, forcing press stops to press down, pressurize number minute is removed mould, and Expansion Joint Pressing is complete.
According to the driven dimension blanking, the circular shell ring of assembly welding (only allow the vertical welding point of docking, forbid to dock circle welding joint) requires every butt weld all should through welding; The vertical welding point of circular shell ring carries out 100%X ray Non-Destructive Testing (RT detection) by JB/T4730-2005, and the transillumination quality is not less than the AB level, and evaluation II level is qualified; The circular shell ring of RT passed examination is vertically put into counterdie, and the attention gap should be mixed well, and then mold is put into circular shell ring upper-end part of driving.V-arrangement and O-ring seals are adopted in sealing between upper and lower mould and the circular shell ring; Adopt hydraulic test pump water-filling in the circular shell ring, air is discharged from the cope match-plate pattern steam vent, treats circular shell ring at the intermediate die place slightly during projection, removes cushion block in the middle of the mould; Hydraulic test pump continues to circular shell ring water-filling, and forcing press slowly presses down, and hydraulic test pump water-filling pressure and forcing press pressed down speed and will mate this moment, when treating that upper and lower each mould is combined together, hydraulic test pump stops the water-filling pressurization, and forcing press stops to press down, pressurize number minute is removed mould, and Expansion Joint Pressing is complete; The expansion joint linear side dimension adopts machine-tooled method to finish.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. one kind is adopted and reduces the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage, it is characterized in that the method comprises:
According to the driven dimension blanking, the circular shell ring of assembly welding requires every butt weld all should through welding;
The vertical welding point of circular shell ring carries out the Non-Destructive Testing of 100%X ray;
The circular shell ring of RT passed examination is vertically put into counterdie, and the gap should be mixed well, and then mold is put into circular shell ring upper-end part of driving;
Adopt hydraulic test pump water-filling in the circular shell ring, air is discharged from the cope match-plate pattern steam vent, treats circular shell ring at the intermediate die place slightly during projection, removes cushion block in the middle of the mould;
Hydraulic test pump continues to circular shell ring water-filling, and forcing press slowly presses down, and hydraulic test pump water-filling pressure and forcing press pressed down speed and will mate this moment, when treating that upper and lower each mould is combined together, hydraulic test pump stops the water-filling pressurization, and forcing press stops to press down, pressurize number minute is removed mould, and Expansion Joint Pressing is complete.
2. employing as claimed in claim 1 reduces the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage, it is characterized in that, according to the driven dimension blanking, the circular shell ring of assembly welding, only allow the vertical welding point of docking, forbid to dock circle welding joint.
3. employing as claimed in claim 1 reduces the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage, it is characterized in that, the vertical welding point of circular shell ring carries out the Non-Destructive Testing of 100%X ray by JB/T4730-2005, and the transillumination quality is not less than the AB level, and evaluation II level is qualified.
4. employing as claimed in claim 1 reduces the method that the cylindrical shell sectional area reduces bellows expansion joint shaping external pressure tonnage, it is characterized in that, V-arrangement and O-ring seals are adopted in sealing between upper and lower mould and the circular shell ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105951894A CN103042086A (en) | 2012-12-21 | 2012-12-21 | Method for lowering formation external pressure tonnage of bellows expansion joint by reducing sectional area of cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105951894A CN103042086A (en) | 2012-12-21 | 2012-12-21 | Method for lowering formation external pressure tonnage of bellows expansion joint by reducing sectional area of cylinder |
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|---|---|
| CN103042086A true CN103042086A (en) | 2013-04-17 |
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| CN2012105951894A Pending CN103042086A (en) | 2012-12-21 | 2012-12-21 | Method for lowering formation external pressure tonnage of bellows expansion joint by reducing sectional area of cylinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813369A (en) * | 2018-12-26 | 2019-05-28 | 江苏丰禾机械制造股份有限公司 | A kind of the postwelding inspection and processing method of bellows |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03294023A (en) * | 1990-04-11 | 1991-12-25 | Mitsubishi Heavy Ind Ltd | Manufacture of double tube bellows |
| JP2002005288A (en) * | 2000-06-16 | 2002-01-09 | Nhk Spring Co Ltd | Method for manufacturing metal bellows |
| CN1383943A (en) * | 2002-06-14 | 2002-12-11 | 张凯锋 | Superplastic forming process of titanium alloy corrugated pipe |
| CN2864303Y (en) * | 2005-11-16 | 2007-01-31 | 王焕庆 | Multi-wave thick wall integrally-formed corrugated-type expansion joint |
| CN201028221Y (en) * | 2007-05-23 | 2008-02-27 | 王焕庆 | Multi-wave thick-wall omega shaped expansion joint with bearing ring |
-
2012
- 2012-12-21 CN CN2012105951894A patent/CN103042086A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03294023A (en) * | 1990-04-11 | 1991-12-25 | Mitsubishi Heavy Ind Ltd | Manufacture of double tube bellows |
| JP2002005288A (en) * | 2000-06-16 | 2002-01-09 | Nhk Spring Co Ltd | Method for manufacturing metal bellows |
| CN1383943A (en) * | 2002-06-14 | 2002-12-11 | 张凯锋 | Superplastic forming process of titanium alloy corrugated pipe |
| CN2864303Y (en) * | 2005-11-16 | 2007-01-31 | 王焕庆 | Multi-wave thick wall integrally-formed corrugated-type expansion joint |
| CN201028221Y (en) * | 2007-05-23 | 2008-02-27 | 王焕庆 | Multi-wave thick-wall omega shaped expansion joint with bearing ring |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813369A (en) * | 2018-12-26 | 2019-05-28 | 江苏丰禾机械制造股份有限公司 | A kind of the postwelding inspection and processing method of bellows |
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Application publication date: 20130417 |
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