CN114704693A - High-specific strength pipe and manufacturing method thereof - Google Patents
High-specific strength pipe and manufacturing method thereof Download PDFInfo
- Publication number
- CN114704693A CN114704693A CN202210410765.7A CN202210410765A CN114704693A CN 114704693 A CN114704693 A CN 114704693A CN 202210410765 A CN202210410765 A CN 202210410765A CN 114704693 A CN114704693 A CN 114704693A
- Authority
- CN
- China
- Prior art keywords
- pipe fitting
- metal pipe
- dry ice
- specific strength
- liquid nitrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 55
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 44
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 36
- 235000011089 carbon dioxide Nutrition 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 13
- 239000010935 stainless steel Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008094 contradictory effect Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013500 performance material Substances 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- 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
Abstract
The invention discloses a high-specific strength pipe and a manufacturing method thereof. When in manufacturing, a plug is welded at one end of the metal pipe fitting to seal the end; then placing the metal pipe fitting in a liquid nitrogen tank for cooling, wherein the other end of the metal pipe fitting is positioned outside the liquid nitrogen tank, and cooling the other end of the metal pipe fitting to a set temperature; adding dry ice into the tube cavity through the other end of the metal pipe fitting; welding a plug at the other end of the metal pipe fitting to seal the other end so as to seal the dry ice in the pipe cavity; and taking out the metal pipe fitting, and gasifying the dry ice at normal temperature to form high-pressure gas inside the metal pipe fitting, namely obtaining the high-specific strength pipe. The invention can effectively improve the specific rigidity and the specific strength of the material, and has simple manufacture and flexible adjustment.
Description
Technical Field
The invention relates to technical improvement of high-pressure thin-wall materials, in particular to a high-specific-strength pipe and a manufacturing method thereof, and belongs to the technical field of material manufacturing.
Background
During engineering applications, it is often desirable for a material to have a higher stiffness and strength, however, increases in stiffness and strength of a material often are contradictory to applications with an increase in weight and density of the material, and contradictory to specific stiffness and specific strength. How to solve the contradictions becomes an important problem of material science research, the improvement through the structural design and the novel composite improvement achieve certain results, and particularly great progress is made in the structural design. How to provide a material which is easy to prepare, has better specific rigidity and specific strength and can be controlled has been the research direction of the technicians in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-specific-strength pipe and a manufacturing method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a high specific strength tubular product, includes metal pipe fitting, is filled with high-pressure gas in metal pipe fitting lumen intussuseption, and metal pipe fitting's both ends are equipped with the end cap in order to seal high-pressure gas in the lumen.
The high pressure gas is carbon dioxide.
The metal pipe fitting is a stainless steel pipe.
A method for manufacturing a high-specific strength pipe comprises the following steps,
1) welding a plug at one end of the metal pipe fitting with two open ends to seal the end;
2) placing the metal pipe fitting obtained in the step 1) in a liquid nitrogen tank for cooling and fixing the metal pipe fitting with the liquid nitrogen tank, wherein the other end of the metal pipe fitting is positioned outside the liquid nitrogen tank, and the other end of the metal pipe fitting is cooled to a set temperature; the set temperature is lower than the boiling point of the dry ice;
3) adding dry ice into the tube cavity through the other end of the metal pipe fitting;
4) welding a plug at the other end of the metal pipe fitting to seal the other end so as to seal the dry ice in the pipe cavity;
5) and taking out the metal pipe fitting, and gasifying the dry ice at normal temperature to form high-pressure gas inside the metal pipe fitting, namely obtaining the high-specific strength pipe.
Preferably, when the plug is welded in the step 4), the welding gun is kept fixed, and the liquid nitrogen tank and the metal pipe fitting are rotated to complete the welding of the plug.
And 3) adding dry ice according to the required high pressure obtained in the pipe cavity after the dry ice is gasified at normal temperature.
And (5) when the step 3) and the step 4) are carried out, the metal pipe fitting is always positioned in the liquid nitrogen tank.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, a novel engineering material is constructed in a unique mode of filling high-pressure gas into the thin-wall stainless steel pipe fitting, and the specific rigidity and specific strength of the material are effectively improved.
2. The invention has simple and practical manufacture, can well meet the requirements of high specific strength and high rigidity performance materials in engineering, and can achieve the aim of adjusting the mechanical property of the component material by adjusting the dry ice amount according to actual needs.
Drawings
FIG. 1 is a schematic view of the structure of the high specific strength pipe of the present invention.
FIG. 2 is a schematic view of the process of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the invention provides a high specific strength pipe, which comprises a metal pipe 1, wherein a high-pressure gas 3 is filled in a pipe cavity of the metal pipe, and plugs 2 are arranged at two ends of the metal pipe 1 to seal the high-pressure gas 3 in the pipe cavity.
The high pressure gas 3 is carbon dioxide.
The metal pipe fitting 1 is a stainless steel pipe.
Although the strength and the rigidity of the body material are reduced due to the fact that the wall thickness of the metal pipe fitting is thin, the reduction of the strength and the rigidity of the material can be effectively compensated through filling high-pressure gas and sealing the high-pressure gas in the pipe fitting, and meanwhile, the density of the composite material can be greatly reduced, so that from the comprehensive point of view, the strength and the rigidity of the thin-wall material are reduced, but the reduction range of the density is larger, and the specific rigidity and the specific strength of the composite material are improved.
In the design idea, how to seal the high-pressure carbon dioxide in the stainless steel pipe fitting is a difficult problem, and the invention finds a manufacturing method which is economical and practical and has practical operability through demonstration of various schemes, and the manufacturing process is schematically shown in figure 2. The detailed steps are as follows,
1) welding a plug 2 at one end of a metal pipe fitting 1 with two open ends to seal the end;
2) placing the metal pipe fitting 1 obtained in the step 1) in a liquid nitrogen tank 5 for cooling and fixing with the liquid nitrogen tank 5, wherein the end, welded with the plug 2, of the metal pipe fitting 1 is submerged in liquid nitrogen 6, the other end of the metal pipe fitting 1 is located outside the liquid nitrogen tank 5, and the other end of the metal pipe fitting is cooled to a set temperature through liquid nitrogen cooling; the set temperature is lower than the boiling point of the dry ice;
3) adding dry ice 4 into the pipe cavity through the other end of the metal pipe fitting 1;
4) welding a plug 2 at the other end of the metal pipe fitting 1 to seal the other end so as to seal the dry ice 4 in the pipe cavity;
5) and taking out the metal pipe fitting 1, and gasifying the dry ice 4 at normal temperature to form high-pressure gas 3 in the metal pipe fitting, namely obtaining the high-pressure thin-wall component.
And 4) when the plug is welded, keeping the position of the welding gun 7 fixed, and rotating the liquid nitrogen tank 5 and the metal pipe fitting 1 to complete the welding of the plug.
And in the process of the steps 3) and 4), the metal pipe fitting is always positioned in the liquid nitrogen tank 5.
In one embodiment, a thin-wall stainless steel tube with the outer diameter of 12mm and the wall thickness of 0.2mm is used as a base material, high-pressure carbon dioxide gas is filled in the stainless steel tube and is sealed in the stainless steel tube, and a novel building material is obtained, so that the specific rigidity and the specific strength of the material are improved.
According to the invention, one end of the stainless steel pipe is welded and sealed through the plug by using a laser welding mode, the sealed stainless steel pipe fitting is placed into liquid nitrogen for low-temperature cooling, and the metal pipe fitting is in an ultralow-temperature state after cooling for a certain time. A quantity of dry ice is then added at the other open end, at which temperature the dry ice is still in a solid state. And then inserting the other plug into the other opening end of the stainless steel tube, rotating the stainless steel tube and the liquid nitrogen tank, and simultaneously starting laser welding the plug at the opening to seal the stainless steel tube, wherein the liquid nitrogen temperature is far lower than the gasification temperature of the dry ice, and the dry ice is in a solid state even in the welding heat release process. And after sealing is finished, taking out the sealed pipe fitting, wherein the pipe fitting forms high-pressure gas in the pipe fitting due to the gasification of the dry ice at normal temperature to obtain the required high-pressure sealing component. The process can conveniently obtain different internal pressure components by adjusting the adding amount of the dry ice, thereby conveniently achieving the purpose of adjusting the specific rigidity and the specific strength of the component material.
The high-pressure component is tested by a three-point bending mechanical testing device, and the mechanical data obtained for components with different internal pressures can be seen, so that the specific strength is obviously increased along with the increase of the internal pressure, and the specific rigidity is generally improved.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. It is not exhaustive here for all embodiments. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a high specific strength tubular product, includes metal pipe fitting, its characterized in that: high-pressure gas is filled in the tube cavity of the metal tube, and plugs are arranged at two ends of the metal tube to seal the high-pressure gas in the tube cavity.
2. The high specific strength pipe material according to claim 1, wherein: the high pressure gas is carbon dioxide.
3. The high specific strength pipe material according to claim 1, wherein: the metal pipe fitting is a stainless steel pipe.
4. A method for manufacturing a high-specific strength pipe is characterized by comprising the following steps: the steps are as follows,
1) welding a plug at one end of the metal pipe with two open ends to seal the end;
2) placing the metal pipe fitting obtained in the step 1) in a liquid nitrogen tank for cooling and fixing the metal pipe fitting with the liquid nitrogen tank, wherein the other end of the metal pipe fitting is positioned outside the liquid nitrogen tank, and the other end of the metal pipe fitting is cooled to a set temperature; the set temperature is lower than the boiling point of the dry ice;
3) adding dry ice into the tube cavity through the other end of the metal pipe fitting;
4) welding a plug at the other end of the metal pipe fitting to seal the other end so as to seal the dry ice in the pipe cavity;
5) and taking out the metal pipe fitting, and gasifying the dry ice at normal temperature to form high-pressure gas inside the metal pipe fitting, namely obtaining the high-specific strength pipe.
5. The method for manufacturing the high specific strength pipe material according to claim 4, wherein the method comprises the following steps: and 4) when the plug is welded, keeping the position of a welding gun fixed, and rotating the liquid nitrogen tank and the metal pipe fitting to complete the welding of the plug.
6. The method for manufacturing the high-specific-strength pipe according to claim 4, wherein the method comprises the following steps: and 3) adding dry ice according to the required high pressure obtained in the pipe cavity after the dry ice is gasified at normal temperature.
7. The method for manufacturing the high specific strength pipe material according to claim 4, wherein the method comprises the following steps: and (5) when the step 3) and the step 4) are carried out, the metal pipe fitting is always positioned in the liquid nitrogen tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410765.7A CN114704693A (en) | 2022-04-19 | 2022-04-19 | High-specific strength pipe and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410765.7A CN114704693A (en) | 2022-04-19 | 2022-04-19 | High-specific strength pipe and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114704693A true CN114704693A (en) | 2022-07-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210410765.7A Pending CN114704693A (en) | 2022-04-19 | 2022-04-19 | High-specific strength pipe and manufacturing method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN114704693A (en) |
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- 2022-04-19 CN CN202210410765.7A patent/CN114704693A/en active Pending
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