CN112025219B - Method for processing stainless steel elbow lined with stainless steel for wire connection by utilizing ductility of stainless steel - Google Patents
Method for processing stainless steel elbow lined with stainless steel for wire connection by utilizing ductility of stainless steel Download PDFInfo
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- CN112025219B CN112025219B CN202010883697.7A CN202010883697A CN112025219B CN 112025219 B CN112025219 B CN 112025219B CN 202010883697 A CN202010883697 A CN 202010883697A CN 112025219 B CN112025219 B CN 112025219B
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- stainless steel
- pipe
- elbow
- stretching
- wall
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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)
- Branch Pipes, Bends, And The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Joints Allowing Movement (AREA)
Abstract
The invention discloses a method for processing a stainless steel elbow lined for wire connection by utilizing ductility and stretchability of stainless steel. Comprises cutting a stainless steel round tube into sections; pre-stretching the pipe section to form a bent pipe; performing secondary stretching on the pre-stretched bent pipe; cutting an end elbow; and (5) polishing and deburring the cut surface. The invention utilizes the ductility of the soft stainless steel for stretching, adopts cold processing in the whole process, saves equipment and working procedures, saves energy and is green and environment-friendly. The thickness of the tube wall of the stainless steel tube as the raw material is only 0.3mm, the thickness of the tube wall of the stretched bending section is only 0.28-0.29mm, the inner space of the steel tube is not occupied, the outer wall and the inner wall of the machined and molded lining stainless steel elbow have good smoothness, and the flow rate and the flow velocity of fluid in the steel tube are not influenced. The processing method has the advantages of high efficiency, good economy and high yield. The stainless steel has stable properties and corrosion resistance, is suitable for various fluids, protects the steel pipe from corrosion and oxidation, and prolongs the service life of the whole steel pipe.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a method for machining a stainless steel elbow lined for wire connection by utilizing ductility and stretchability of stainless steel.
Background
The stainless steel elbow is embedded in the inner wall of the steel pipe elbow, the bimetal composite steel pipe joint greatly improves the corrosion resistance of the steel pipe in the water, hot water, gas, natural gas and oil transportation processes, has smooth surface and small fluid resistance, maintains high mechanical strength of the steel pipe, overcomes the defects that the galvanized steel pipe is easy to corrode, and a plastic pipe adopting hot melt connection is easy to leak and age, and is an ideal product for upgrading and upgrading the gas, water and oil transportation steel pipe.
The inner wall of the pipeline of the stainless steel lined composite steel pipe joint forms a layer of extremely thin chromium oxide film lined pipe in the using 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 existing stainless steel elbow production method is to heat and bend a straight pipe and perform 2 butt welding forming, for a stainless steel lined composite steel pipe, because the lined stainless steel is usually thinner, the stainless steel lined elbow is easy to damage due to direct bending or heating and welding, so that defective products are more, and the production efficiency is low.
The applicant discloses a method for processing a lining stainless steel elbow for a groove by using water expansion in a Chinese invention patent with the application number of 2018111779385, the method is used for processing the lining stainless steel elbow for the groove and is suitable for processing a stainless steel pipe with the thickness of 0.35mm-0.5mm and the inner diameter of 80-300mm, but the method is not suitable for processing a lining stainless steel elbow for wire connection, the diameter of the stainless steel pipe is 15mm-65mm and the thickness of the stainless steel pipe is about 0.3.
Disclosure of Invention
The technical problems solved by the invention are as follows: the existing method can not process the stainless steel elbow lined with the wire joint with high efficiency and high precision.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method of forming a stainless steel lined elbow for wire bonding using ductile stretch processing of stainless steel, comprising the steps of:
(1) Cutting the stainless steel round pipe into sections;
(2) Pre-stretching the pipe section to form a bent pipe;
(3) Performing secondary stretching on the pre-stretched bent pipe;
(4) Cutting an end elbow;
(5) And (5) grinding and deburring the cut surface.
Preferably, in the step (1), the stainless steel round pipe is cold-rolled sheet soft stainless steel.
Preferably, the stainless steel round tube has a thickness of 0.3mm.
Preferably, in step (2), both ends of the stainless steel pipe section are simultaneously stretched to pre-stretch the stainless steel round pipe to a desired angle.
Preferably, in the step (3), the secondary stretching realizes the angular deviation adjustment and improves the inner wall smoothness.
Preferably, in step (3), the spherical mold is fitted into the elbow pipe by secondary drawing so that the inner wall of the elbow pipe is extended into a spherical outer surface shape.
Preferably, the secondary drawing is performed 2 times, and the two pieces are placed in the ball mold from different ports, and drawn in the opening direction of the two ports.
Preferably, the wall thickness of the bent section of the stainless steel elbow with the finished drawing lining is 0.28-0.29mm.
Preferably, the stretched lined stainless steel elbow is cut at the end, and the cutting angle corresponds to the angle of the steel pipe elbow.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) The application discloses a method of utilizing ductility stretch processing silk of stainless steel to connect with inside lining stainless steel elbow utilizes ductility of soft state stainless steel to stretch, and whole process adopts cold processing, need not to heat the pipeline section among the stretching process, also need not to weld, saves equipment and process, the energy saving, green.
(2) The thickness of the tube wall of the stainless steel tube is only 0.3mm, the processing is difficult by the conventional method, and the thickness of the tube wall of the stretched bending section is only 0.28-0.29mm by the processing method of the invention, so that the internal space of the steel tube is not occupied, and the flow of the fluid is not influenced.
(3) Through the stretching of two steps, the outer wall and the inner wall of the machined and molded lining stainless steel elbow both have good smoothness, and the flow of fluid in the steel pipe is not influenced.
(4) The processing method has the advantages of high efficiency, good economy, high yield and high qualified product rate of more than 99.5%.
(5) The stainless steel elbow of the lining for wire connection is embedded into the steel pipe elbow, the stainless steel is stable in property and corrosion resistant, is suitable for various fluids, protects the steel pipe from being corroded and oxidized, and prolongs the service life of the whole steel pipe.
Detailed Description
The present invention will be further illustrated by the following specific examples, which are carried out on the premise of the technical scheme of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
The method for processing the stainless steel elbow lining for the wire joint by utilizing the ductility and the stretchability of the stainless steel,
a method of forming a stainless steel lined elbow for wire bonding using ductile stretch processing of stainless steel, comprising the steps of:
(1) Cutting the stainless steel round pipe into sections;
the stainless steel round tube adopts the soft stainless steel of the cold-rolled sheet of the original factory as the raw material to ensure good ductility and no cracks, fractures and the like in the stretching process. And a machine is adopted for cutting in the cutting process, the cutting requirements are consistent in length, and two end faces are neat. In this embodiment, the thickness of the stainless steel round tube is about 0.3mm.
(2) Pre-stretching the pipe section to form a bent pipe; the pre-stretching can be performed by adopting a bending die, so that the working efficiency is improved. During pre-stretching, the two ends of the stainless steel tube segment are simultaneously stretched, and the stainless steel tube is pre-stretched to a required approximate angle, such as 60 degrees, 90 degrees and the like, as required.
(3) Performing secondary stretching on the pre-stretched bent pipe;
after pre-stretching, the distance from the required angle is deviated, the inner wall is not smooth, the flow velocity of fluid is influenced, the angle deviation adjustment is realized through secondary stretching, and the smoothness of the inner wall is improved.
And (3) secondary stretching, namely, a spherical mold is adopted, the surface of the spherical mold is required to be smooth and round, the spherical mold can be made of stainless steel and other materials with higher hardness, and the like, and the spherical mold is embedded into the bent pipe, so that the inner wall of the bent pipe extends to form the spherical outer surface shape, the angle is expected, and the inner surface is smooth.
In order to further improve the angle accuracy and the inner surface smoothness, the secondary drawing is carried out for 2 times, the spherical mould is respectively placed into the spherical mould from different ports, and the spherical mould is respectively drawn towards the opening directions of the two ports, so that the extension effect is ensured. The secondary stretching can be performed manually or by machine.
The wall thickness of the bending section of the stainless steel elbow with the lining after stretching is 0.28-0.29mm, and the inner surface and the outer surface are smooth without cracks and fractures.
(4) Cutting an end elbow;
and (4) stretching the finished lining stainless steel elbow, cutting the end part, wherein the cutting angle corresponds to the angle of the steel pipe elbow.
(5) And (5) grinding and deburring the cut surface. After the installation, the steel pipe elbow can be installed in the steel pipe elbow.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (2)
1. A method for processing a stainless steel elbow lined for wire connection by utilizing the ductility and the stretchability of stainless steel is characterized in that the stainless steel elbow lined by utilizing the ductility and the stretchability of soft stainless steel is stretched, and cold processing is adopted in the whole process, and the method comprises the following steps:
(1) Cutting a stainless steel round pipe into sections, wherein the stainless steel round pipe is made of cold-rolled sheet soft stainless steel; the thickness of the pipe wall of the stainless steel pipe as the raw material is 0.3mm;
(2) Pre-stretching the pipe section to form a bent pipe; simultaneously stretching the two ends of the stainless steel pipe section, and pre-stretching a stainless steel round pipe to a required angle; when in pre-stretching, the two ends of the stainless steel pipe section are stretched simultaneously, and the stainless steel circular pipe is pre-stretched to a required angle according to the requirement, wherein the angle is 60 degrees or 90 degrees;
(3) Performing secondary stretching on the pre-stretched bent pipe;
the angle deviation adjustment is realized by secondary stretching, and the smoothness of the inner wall is improved; secondary stretching, namely embedding the spherical mold into the bent pipe to ensure that the inner wall of the bent pipe extends to form the shape of a spherical outer surface; performing secondary stretching for 2 times, respectively placing the two spherical molds into different ports, and respectively stretching the two spherical molds towards the opening directions of the two ports;
(4) Cutting an end elbow;
(5) Polishing and deburring the cut surface;
the wall thickness of the bent section of the stainless steel elbow with the inner lining after being stretched is 0.28-0.29mm.
2. The method of utilizing the ductility, stretch ability of stainless steel to fabricate a stainless steel-lined elbow for a wire joint as set forth in claim 1, wherein: and (4) stretching the finished lining stainless steel elbow, cutting the end part, wherein the cutting angle corresponds to the angle of the steel pipe elbow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010883697.7A CN112025219B (en) | 2020-08-27 | 2020-08-27 | Method for processing stainless steel elbow lined with stainless steel for wire connection by utilizing ductility of stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010883697.7A CN112025219B (en) | 2020-08-27 | 2020-08-27 | 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 | Publication Date |
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| CN112025219A CN112025219A (en) | 2020-12-04 |
| CN112025219B true CN112025219B (en) | 2023-01-03 |
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| CN202010883697.7A Active CN112025219B (en) | 2020-08-27 | 2020-08-27 | Method for processing stainless steel elbow lined with stainless steel for wire connection by utilizing ductility of stainless steel |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1184722A (en) * | 1997-12-24 | 1998-06-17 | 章新生 | Flexibly rolled double metal bend, method for producing same, device for rolling internal wall thereof |
| CN205684572U (en) * | 2016-04-21 | 2016-11-16 | 温州华征管件科技有限公司 | A kind of bend pipe mould of bend pipe shaping apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3780591A (en) * | 1972-03-22 | 1973-12-25 | Crc Crose Int Inc | Pipe bending die |
| CN108714639A (en) * | 2018-05-11 | 2018-10-30 | 无锡智高点技术研发有限公司 | A kind of bent tube technique |
| CN109175059B (en) * | 2018-10-10 | 2020-04-07 | 江苏新阳光管业科技有限公司 | Method for processing stainless steel elbow with lining for groove by water expansion |
| CN109807567B (en) * | 2019-03-19 | 2019-11-08 | 南昌航空大学 | A method of improving 1D and following small-bend radius pipe bend straight end length |
-
2020
- 2020-08-27 CN CN202010883697.7A patent/CN112025219B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1184722A (en) * | 1997-12-24 | 1998-06-17 | 章新生 | Flexibly rolled double metal bend, method for producing same, device for rolling internal wall thereof |
| CN205684572U (en) * | 2016-04-21 | 2016-11-16 | 温州华征管件科技有限公司 | A kind of bend pipe mould of bend pipe shaping apparatus |
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| CN112025219A (en) | 2020-12-04 |
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