CN109175059B - Method for processing stainless steel elbow with lining for groove by water expansion - Google Patents
Method for processing stainless steel elbow with lining for groove by water expansion Download PDFInfo
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- CN109175059B CN109175059B CN201811177938.5A CN201811177938A CN109175059B CN 109175059 B CN109175059 B CN 109175059B CN 201811177938 A CN201811177938 A CN 201811177938A CN 109175059 B CN109175059 B CN 109175059B
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- stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention provides a method for processing a lining stainless steel elbow (the thickness of a stainless steel pipe is 0.35-0.5 mm) for a groove by using water expansion, which protects an inner lining layer by water flow stamping in opposite directions, gradually bends the pipe by three-stage water flow scouring, uniformly bears force, prevents the inner lining layer from being damaged due to sudden bending, and greatly prolongs the service life of the lining stainless steel pipe. The invention also selects proper parameters according to different products to be processed through multiple experiments, and is suitable for batch industrial production.
Description
Technical Field
The invention relates to the field of composite water pipes, in particular to a method for processing a stainless steel lining elbow for a groove by using water expansion.
Background
The lining stainless steel composite steel pipe is a stainless steel pipe with the thickness of 0.35mm-0.5mm on the inner wall of the steel pipe, the bimetal composite steel pipe greatly improves the corrosion resistance of the steel pipe in the processes of water transportation, hot water transportation, gas transportation, natural gas transportation and oil transportation, has smooth surface and small fluid resistance, retains the advantages of high mechanical strength of the steel pipe, can adopt welding, groove and thread connection and good sealing property, overcomes the defects that a galvanized steel pipe is easy to corrode and a plastic pipe adopting hot melting connection is easy to leak and age, and is an ideal product for upgrading and replacing gas, water and oil transportation steel pipes.
The inner wall of the pipeline of the lined stainless steel composite steel pipe forms a layer of extremely thin chromium oxide film lined pipe in the use process, and the film prevents the metal from being continuously oxidized, so the stainless steel has strong corrosion resistance, not only can bear the corrosion of water and air, but also can bear the corrosion of weak acid and weak base.
The thickness of the existing stainless steel elbow is 1mm-3mm, the straight pipe is generally heated and bent and 2 pieces of stainless steel are butt-welded to form the elbow, and for the stainless steel lined composite steel pipe, the thickness of the lined stainless steel is generally thinner by 0.3-0.5mm, so that the lined stainless steel pipe is easily damaged by direct bending or heating and welding, and the product development failure is caused.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for processing a lining stainless steel elbow for a groove by using water expansion.
The invention provides a method for processing a stainless steel elbow with a lining for a groove by using water expansion, which comprises the following steps:
1) selecting a plurality of stainless steel pipes to be processed with inner liners as samples, and preparing dies with corresponding sizes according to the required radian of the elbow;
2) sleeving a sample into a mold, introducing high-pressure water flow from one end of the mold to the other end of the mold, and introducing high-pressure water flow in opposite directions into the sample, wherein the water pressure is half of that in the mold;
3) repeating the step 2) on the water pressure introduced into the replacement die, detecting a plurality of groups of samples, selecting the sample with the best detection performance, recording the water pressure used by the sample as 1P, and recording the time for completely bending the sample as t;
4) taking out a sample, selecting a steel pipe to be processed, sleeving the steel pipe into a mold, introducing high-pressure water flow from one end of the mold to the other end of the mold, introducing water flow at the first t/3 time with the water pressure of 1.25P, introducing water flow at the middle t/3 time with the water pressure of 1P, introducing water flow at the last t/3 time with the water pressure of 0.75P, introducing water flow with the opposite direction and the constant water pressure of 0.5P into the sample, and preparing to obtain an elbow;
5) and (5) repeating the step 4) to prepare in batches.
Further improved, the inner diameter of the stainless steel pipe lined in the step 1) is 80-300mm, and the thickness of the stainless steel is 0.3-0.5 mm. The inner diameter is too small, so that the lining is easily damaged, the welding processing time is too long due to too large inner diameter, the production cost is too high, welding seams are more, the quality hidden danger of the welded welding seams is larger, and the economic benefit is highest when a pipe with the inner diameter of 80-300mm is processed.
The invention has the beneficial effects that:
1. protect the lining through opposite direction's rivers punching press to wash away through syllogic rivers and make tubular product crooked gradually, even atress prevents to buckle suddenly and leads to the lining damage, the life of the nonrust steel pipe of greatly increased inside lining.
2. Through multiple experiments, proper parameters are selected according to different products to be processed, and the method is suitable for batch industrial production.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The invention provides a method for processing a stainless steel elbow with a lining for a groove by using water expansion, which comprises the following steps:
1) selecting a plurality of stainless steel pipes to be processed with inner liners as samples, and preparing dies with corresponding sizes according to the required radian of the elbow;
2) sleeving a sample into a mold, introducing high-pressure water flow from one end of the mold to the other end of the mold, and introducing high-pressure water flow in opposite directions into the sample, wherein the water pressure is half of that in the mold;
3) repeating the step 2) on the water pressure introduced into the replacement die, detecting a plurality of groups of samples, selecting the sample with the best detection performance, recording the water pressure used by the sample as 1P, and recording the time for completely bending the sample as t;
4) taking out a sample, selecting a steel pipe to be processed, sleeving the steel pipe into a mold, introducing high-pressure water flow from one end of the mold to the other end of the mold, introducing water flow at the first t/3 time with the water pressure of 1.25P, introducing water flow at the middle t/3 time with the water pressure of 1P, introducing water flow at the last t/3 time with the water pressure of 0.75P, introducing water flow with the opposite direction and the constant water pressure of 0.5P into the sample, and preparing to obtain an elbow;
5) and (5) repeating the step 4) to prepare in batches.
Further improved, the inner diameter of the lining stainless steel pipe in the step 1) is 80-300 mm. The inner diameter is too small, so that the lining is easily damaged, the inner diameter is too large, the processing time is too long, the production cost is too high, and the economic benefit is highest when the pipe with the inner diameter of 80-300mm is processed.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. A method for processing a stainless steel elbow with a thickness of 0.35mm-0.5mm for a groove by using water expansion is characterized by comprising the following steps:
1) selecting a plurality of stainless steel pipes to be processed with inner liners as samples, and preparing dies with corresponding sizes according to the required radian of the elbow;
2) sleeving a sample into a mold, introducing high-pressure water flow from one end of the mold to the other end of the mold, and introducing high-pressure water flow in opposite directions into the sample, wherein the water pressure in the sample is half of the water pressure in the mold;
3) changing the water pressure introduced into the die, repeating the step 2), detecting a plurality of groups of samples, selecting the sample with the best detection performance, recording the water pressure used by the sample as 1P, and recording the complete bending time as t;
4) taking out a sample, selecting a to-be-processed stainless steel lining pipe, sleeving the to-be-processed stainless steel lining pipe into a mold, introducing high-pressure water flow from one end of the mold to the other end of the mold, wherein the water pressure of the water flow introduced at the first t/3 time is 1.25P, the water pressure of the water flow introduced at the middle t/3 time is 1P, the water pressure of the water flow introduced at the last t/3 time is 0.75P, and introducing water flow with the water pressure of 0.5P and the opposite direction into the to-be-processed stainless steel lining pipe to prepare an;
5) and (5) repeating the step 4) to prepare in batches.
2. The method for processing the stainless steel elbow with the thickness of 0.35mm-0.5mm for the groove by using the water expansion as claimed in claim 1, wherein the method comprises the following steps: the inner diameter of the lining stainless steel pipe in the step 1) is 80-300 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811177938.5A CN109175059B (en) | 2018-10-10 | 2018-10-10 | Method for processing stainless steel elbow with lining for groove by water expansion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811177938.5A CN109175059B (en) | 2018-10-10 | 2018-10-10 | Method for processing stainless steel elbow with lining for groove by water expansion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109175059A CN109175059A (en) | 2019-01-11 |
| CN109175059B true CN109175059B (en) | 2020-04-07 |
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| CN201811177938.5A Active CN109175059B (en) | 2018-10-10 | 2018-10-10 | Method for processing stainless steel elbow with lining for groove by water expansion |
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| CN112025219B (en) * | 2020-08-27 | 2023-01-03 | 江苏新阳光管业科技有限公司 | Method for processing stainless steel elbow lined with stainless steel for wire connection by utilizing ductility of stainless steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3509217B2 (en) * | 1994-09-20 | 2004-03-22 | 株式会社日立製作所 | Forming method and forming apparatus for deformed cross-section pipe |
| JP4086216B2 (en) * | 1999-03-02 | 2008-05-14 | 株式会社エフテック | Hydroforming method of pipe material |
| CN101318205B (en) * | 2008-06-24 | 2010-06-02 | 南京航空航天大学 | Circumferential nature supercharging plate liquid filling deep-drawing forming method and apparatus |
| CN103920789B (en) * | 2014-05-06 | 2015-08-05 | 哈尔滨工业大学 | A kind of elbow three-way pipe internal high pressure forming mould and method |
| CN106734340B (en) * | 2015-11-23 | 2019-03-01 | 宁波思明汽车科技股份有限公司 | A kind of preparation method of bend pipe tee tube |
| CN207266986U (en) * | 2017-09-27 | 2018-04-24 | 浙江海卓利克液压科技有限公司 | Hydraulic-bend molding machine |
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