A spinning method for a metal high-pressure short gas cylinder

Abstract

This invention provides a spinning method for short high-pressure metal cylinders. The spinning method includes the following steps: preparing a pipe with a length at least twice the length of the target short high-pressure metal cylinder; spinning a first cylinder head at the first opening of the pipe; rotating the pipe and spinning a second cylinder head at the second opening; connecting the first and second cylinder heads together to form a connecting assembly; spinning a third cylinder head at the third opening of the connecting assembly; rotating the connecting assembly and spinning a fourth cylinder head at the fourth opening; then placing the cylinders in a heat treatment furnace for heat treatment; after heat treatment, cutting the first and second cylinder heads to obtain two target short high-pressure metal cylinders. This invention can simultaneously complete the spinning of two short high-pressure cylinders, not only avoiding the problem of heavy spinning equipment being unable to be installed due to the short cylinder length, but also saving tooling costs and the disassembly and assembly process of tooling. Furthermore, the butt welding of the cylinder mouths improves the efficiency of heat treatment.

Description

Technical Field

[0001] This invention relates to the field of pressure vessel manufacturing technology, and in particular to a spinning method for a short metal high-pressure gas cylinder. Background Technology

[0002] With the continuous development of modern industrial technology, the demand for high-pressure short metal gas cylinders in high-tech fields such as semiconductors, marine engineering, and aerospace is rapidly increasing. Spin forming is used to process seamless gas cylinders, allowing for material redistribution during processing to meet cylinder size requirements. This forming method fundamentally eliminates weld defects found in welded gas cylinders and is currently the mainstream method for forming high-pressure seamless gas cylinders.

[0003] Metal high-pressure short gas cylinders have a large diameter and thick wall, and are short in length, requiring heavy-duty spinning equipment for spinning processing. Companies produce gas cylinders of various specifications and lengths. Cylinders shorter than 4.5m are generally called short cylinders, and those longer than 4.5m are called long cylinders. Companies manufacturing metal high-pressure short cylinders also produce long cylinders, but the length of cylinders spun by heavy-duty spinning equipment is generally configured according to the maximum length of cylinders the company can produce. Heavy-duty spinning equipment typically consists of a front frame and a rear frame. During cylinder spinning, the front end of the cylinder is firmly secured by jaws on the front frame, which provide the rotational torque. The jaws on the rear frame grip the rear end of the cylinder, keeping it driven. When the cylinder length exceeds the rated length, the jaws on both the front and rear frames can simultaneously hold the cylinder, maintaining a stable spinning working state and completing the cylinder spinning process. When the cylinder length is below a certain limit, the jaws on the rear frame cannot properly grip the rear end of the cylinder.

[0004] The traditional method involves installing tooling at the rear frame to connect the short cylinder tail to the frame, ensuring stable spinning during the process. However, this method cannot meet higher precision coaxiality requirements and cannot guarantee precise spinning. During the spinning process of metal high-pressure short cylinders, the tooling installed on the rear frame must be installed and removed once before and after spinning each set of cylinders. This not only requires significant tooling costs but also limits its application to single-length cylinders, resulting in low production efficiency. Summary of the Invention

[0005] In view of this, the present invention aims to propose a spinning method for high-pressure short gas cylinders to solve the problem of complex and inefficient precision spinning forming process of high-pressure short gas cylinders, avoid the use of complex tooling in the spinning process, reduce the operation process, and realize the direct spinning of two high-pressure short gas cylinders, thereby improving the spinning forming efficiency of high-pressure short gas cylinders.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A spinning method for a short metal high-pressure gas cylinder involves spinning the cylinder using heavy-duty spinning equipment. The heavy-duty spinning equipment includes a front frame box jaws, a front frame box, a rear frame box jaws, a rear frame box, and spinning wheels. The spinning method includes the following steps:

[0008] S1. Prepare a pipe with a length of more than twice the length of the target metal high-pressure short gas cylinder. The pipe is a hollow cylindrical pipe with openings on both sides. One side of the pipe is the first side, and the other side is the second side.

[0009] S2. Use the front frame box to drive the front frame box jaws to move so that the front frame box jaws clamp the first side of the pipe, and use the rear frame box to drive the rear frame box jaws to clamp the second side of the pipe.

[0010] S3. The front frame box provides rotational torque to rotate the pipe, and the rotating spinning wheel spins the pipe at the opening on the first side to form the first bottle head;

[0011] S4. Turn the pipe that has been spun on one side around, use the front frame box to drive the front frame box jaws to move so that the front frame box jaws clamp the second side of the pipe, and use the rear frame box to drive the rear frame box jaws to clamp the first side of the pipe.

[0012] S5. The front frame box provides rotational torque to rotate the pipe, and the rotating spinning wheel spins the pipe at the opening on the second side to form a second bottle head;

[0013] S6. Cut the pipe that has been spun on both sides in the middle to form two parts. One side of one part is the first bottle head and the other side is the third side with an opening. The other part is the second bottle head and the other side is the fourth side with an opening. Connect the first bottle head and the second bottle head together to form a connecting assembly. One side of the connecting assembly is the third side and the other side is the fourth side.

[0014] S7. The front frame box is driven to move the front frame box jaws to clamp the third side of the connecting assembly, and the rear frame box is driven to clamp the fourth side of the connecting assembly; the operation of the front frame box provides rotational torque to rotate the pipe, and the rotating spinning wheel spins the pipe at the opening on the third side of the connecting assembly to form the third bottle head.

[0015] S8. Turn the connecting assembly around, use the front frame box to drive the front frame box jaws to move so that the front frame box jaws clamp the fourth side of the connecting assembly, and use the rear frame box to drive the rear frame box jaws to clamp the third side of the connecting assembly; the operation of the front frame box provides rotational torque to rotate the pipe, and the rotating spinning wheel spins the pipe at the opening on the fourth side of the connecting assembly to form the fourth bottle head;

[0016] S9. The connecting components that have been spun on both sides are unloaded from the heavy spinning equipment and sent into the heat treatment furnace for heat treatment. After the heat treatment is completed, the first bottle head and the second bottle head are cut to obtain two target metal high-pressure short gas cylinders.

[0017] Furthermore, in step S1, a pipe with a length twice that of the target metal high-pressure short gas cylinder is prepared.

[0018] Furthermore, in step S2, when the front frame box jaws clamp the first side of the pipe, the front frame box jaws extend from the opening near the first side.

[0019] Furthermore, in step S4, when the front frame box jaws clamp the second side of the pipe, the front frame box jaws extend from the opening near the second side.

[0020] Furthermore, in step S6, the first bottle head and the second bottle head are connected together by any one of welding or fastener connection to form a connecting assembly.

[0021] Furthermore, in step S7, when the front frame box claw clamps the third side of the connecting assembly, the front frame box claw extends out of the opening near the third side.

[0022] Furthermore, in step S8, when the front frame box claw clamps the fourth side of the connecting assembly, the front frame box claw extends out of the opening near the fourth side.

[0023] Compared with the prior art, the spinning method for short metal high-pressure gas cylinders described in this invention has the following advantages: it can simultaneously complete the spinning of two short metal high-pressure gas cylinders, which not only avoids the problem that heavy spinning equipment cannot be installed due to the short length of the gas cylinders, but also saves high tooling costs and disassembly and assembly processes. At the same time, the butt welding of the cylinder mouth improves the efficiency of heat treatment. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the first spun bottle head described in this invention;

[0026] Figure 2 This is a schematic diagram of the structure of the second spun bottle head described in this invention;

[0027] Figure 3 This is a schematic diagram of the structure of the first bottle head and the second bottle head connected together according to the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the fourth spun bottle head described in this invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Front frame box clamp; 2. Front frame box; 3. Rear frame box clamp; 4. Rear frame box; 5. Spinning roller; 6. First bottle head; 7. Second bottle head; 8. Third bottle head; 9. Fourth bottle head. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments. First, it should be noted that the terms "upper," "lower," "left," "right," "front," and "rear," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. Moreover, it should be understood that after reading the contents of this invention, those skilled in the art can make various modifications or alterations to the present invention, and these modifications or alterations also fall within the scope of protection of this application.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] This invention proposes a spinning method for short metal high-pressure gas cylinders. The short gas cylinders are spun using heavy-duty spinning equipment, which includes a front frame jaw 1, a front frame box 2, a rear frame jaw 3, a rear frame box 4, and spinning wheels 5. The spinning method includes the following steps:

[0034] S1. Prepare a pipe with a length of more than twice the length of the target metal high-pressure short gas cylinder. The pipe is a hollow cylindrical pipe with openings on both sides. One side of the pipe is the first side, and the other side is the second side.

[0035] Furthermore, in step S1, a pipe with a length twice that of the target high-pressure short metal cylinder is prepared. Using the spinning method for high-pressure short metal cylinders of the present invention, two target high-pressure short metal cylinders can be obtained at once using a pipe with a length twice that of the target high-pressure short metal cylinder. This prevents excessive pipe cutting, saves raw materials, and improves efficiency.

[0036] S2. Use the front frame box 2 to drive the front frame box claw 1 to move so that the front frame box claw 1 clamps the first side of the pipe, and use the rear frame box 4 to drive the rear frame box claw 3 so that the rear frame box claw 3 clamps the second side of the pipe.

[0037] Specifically, in industrial production, gas cylinders of different specifications are typically processed, with varying lengths. Cylinders shorter than 4.5m are generally referred to as short cylinders, and those longer than 4.5m as long cylinders. The short cylinders described in this application refer to those shorter than 4.5m. Heavy-duty spinning equipment is generally configured according to the maximum cylinder length that the company can produce. For short cylinders, due to their shorter length, the heavy-duty spinning equipment cannot clamp both sides. That is, after the front frame jaws 1 of the heavy-duty spinning equipment clamp the first side of the short cylinder, the second side of the short cylinder is either inside the front frame 2 or only extends a very short portion beyond the front frame 2, causing the rear frame jaws 3 to be unable to clamp the short cylinder, thus preventing the successful clamping of the short cylinder. In this application, instead of spinning each short gas cylinder individually, two short gas cylinders are processed at once using a pipe with a length twice that of the target metal high-pressure short gas cylinder. This avoids the situation where the cylinders are too short to be installed using heavy spinning equipment.

[0038] Furthermore, in step S2, when the front frame box jaw 1 clamps the first side of the pipe, the front frame box jaw 1 extends out of the opening near the first side, so that the opening on the first side can be exposed and spun.

[0039] S3. The front frame box 2 provides rotational torque to rotate the pipe, and the spinning wheel 5 rotates to spin the pipe at the opening on the first side to form the first bottle head 6;

[0040] S4. Turn the pipe that has been spun on one side around, use the front frame box 2 to drive the front frame box claw 1 to move so that the front frame box claw 1 clamps the second side of the pipe, and use the rear frame box 4 to drive the rear frame box claw 3 so that the rear frame box claw 3 clamps the first side of the pipe.

[0041] Furthermore, in step S4, when the front frame box jaw 1 clamps the second side of the pipe, the front frame box jaw 1 extends out of the opening near the second side, so that the opening on the second side can be exposed and spun.

[0042] S5. The front frame box 2 provides rotational torque to rotate the pipe, and the spinning wheel 5 rotates to spin the pipe at the opening on the second side to form the second bottle head 7.

[0043] S6. Cut the pipe that has been spun on both sides in the middle to form two parts. One side of one part is the first bottle head 6 and the other side is the third side with an opening. The other part is the second bottle head 7 and the other side is the fourth side with an opening. Connect the first bottle head 6 and the second bottle head 7 together to form a connecting assembly. One side of the connecting assembly is the third side and the other side is the fourth side.

[0044] Furthermore, in step S6, the first bottle head 6 and the second bottle head 7 are connected together by any of the following methods: welding or fastener connection, to form a connecting assembly.

[0045] S7. The front frame box 2 drives the front frame box claw 1 to move so that the front frame box claw 1 clamps the third side of the connecting component. The rear frame box 4 drives the rear frame box claw 3 to clamp the fourth side of the connecting component. The operation of the front frame box 2 provides rotational torque to rotate the pipe and spins it at the opening on the third side of the connecting component through the rotation of the spinning wheel 5 to form the third bottle head 8.

[0046] Furthermore, in step S7, when the front frame box claw 1 clamps the third side of the connecting assembly, the opening near the third side extends out of the front frame box claw 1, so that the opening on the third side can be exposed and spun.

[0047] S8. Turn the connecting assembly around, use the front frame box 2 to drive the front frame box claw 1 to move so that the front frame box claw 1 clamps the fourth side of the connecting assembly, and use the rear frame box 4 to drive the rear frame box claw 3 so that the rear frame box claw 3 clamps the third side of the connecting assembly; the operation of the front frame box 2 provides rotational torque to rotate the pipe, and the spinning wheel 5 rotates to spin at the opening on the fourth side of the connecting assembly to form the fourth bottle head 9;

[0048] Furthermore, in step S8, when the front frame box claw 1 clamps the fourth side of the connecting assembly, the opening near the fourth side extends out of the front frame box claw 1, so that the opening on the fourth side can be exposed and spun.

[0049] S9. The connecting components that have been spun on both sides are unloaded from the heavy spinning equipment and sent into the heat treatment furnace for heat treatment. After the heat treatment is completed, the first bottle head 6 and the second bottle head 7 are cut to obtain two target metal high-pressure short gas cylinders.

[0050] Specifically, for manufacturers, both long and short gas cylinders require heat treatment. The uncut connecting components can be directly fed into the heat treatment furnace, using the same furnace as the long gas cylinders, eliminating the need for a separate furnace for the short gas cylinders and reducing investment. Furthermore, both short gas cylinders can be heat-treated simultaneously, significantly improving efficiency. Compared to heat-treating two separate short gas cylinders at once, the connection between the two cylinders in this application prevents the rear cylinder from shifting position and compressing the front cylinder.

[0051] Specifically, the existing technology involves using the cooperation between the front frame box claw 1, the rear frame box claw 3, and the spinning wheel 5 to spin the opening, which will not be described in detail here.

[0052] The spinning method for short high-pressure metal cylinders of this invention uses a pipe with a length at least twice the length of the target short high-pressure metal cylinder to simultaneously spin four cylinder heads, i.e., two short high-pressure metal cylinders. This not only avoids the problem of heavy spinning equipment being unable to be mounted due to the short cylinder length, but also saves significant tooling costs and the disassembly and assembly process of tooling. Furthermore, the butt welding of the cylinder neck improves the efficiency of heat treatment. Through this method, the overall efficiency is increased by approximately 47% (based on the relative time savings for a single batch of 50 cylinders), greatly improving the production line's efficiency.

[0053] Example 1

[0054] Taking a seamless steel metal high-pressure short gas cylinder with specifications of φ610mm×15mm-2160mm as an example, the spinning method of the metal high-pressure short gas cylinder of the present invention is briefly introduced.

[0055] Using a pipe with a length of 4320mm, the front frame box 2 drives the front frame box jaw 1 to move, so that the front frame box jaw 1 clamps the first side of the pipe. The rear frame box 4 drives the rear frame box jaw 3 to clamp the second side of the pipe. The operation of the front frame box 2 provides rotational torque to rotate the pipe, and the rotating spinning wheel 5 spins the pipe at the opening on the first side to form the first bottle head 6.

[0056] The pipe is turned around, and the front frame box 2 drives the front frame box jaw 1 to move so that the front frame box jaw 1 clamps the second side of the pipe. The rear frame box 4 drives the rear frame box jaw 3 to clamp the first side of the pipe. The operation of the front frame box 2 provides rotational torque to make the pipe rotate, and the spinning wheel 5 rotates to spin at the opening on the second side of the pipe to form the second bottle head 7.

[0057] The pipe, after being spun on both sides, is cut in the middle to form two parts of a single-length short gas cylinder. One part has a first cylinder head 6 on one side and a third side with an opening on the other. The other part has a second cylinder head 7 on one side and a fourth side with an opening on the other. The first cylinder head 6 and the second cylinder head 7 are welded together to form a connecting assembly, with the third side on one side and the fourth side on the other. Before welding short gas cylinders of the same specification, theoretical calculations and finite element analysis can be performed to ensure that the weld joint has sufficient weld thickness to prevent failure during the operation of the heavy-duty spinning machine.

[0058] The front frame box jaw 1 clamps the third side of the connecting assembly, and the rear frame box jaw 3 clamps the fourth side of the connecting assembly; the front frame box 2 provides rotational torque to rotate the pipe, and the spinning wheel 5 rotates to spin at the opening on the third side of the connecting assembly to form the third bottle head 8.

[0059] The connecting assembly is turned around, and the fourth side of the connecting assembly is clamped by the front frame box jaw 1, and the third side of the connecting assembly is clamped by the rear frame box jaw 3; the front frame box 2 provides rotational torque to rotate the pipe, and the spinning wheel 5 rotates to spin at the opening on the fourth side of the connecting assembly to form the fourth bottle head 9.

[0060] The connecting components that have been spun on both sides are unloaded from the heavy spinning equipment and sent into a heat treatment furnace for heat treatment. After the heat treatment is completed, the first bottle head 6 and the second bottle head 7 are cut to obtain two target metal high-pressure short gas cylinders.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for spinning a short metal high-pressure gas cylinder, wherein the short gas cylinder is spun using a heavy-duty spinning device, the heavy-duty spinning device comprising a front frame box jaw (1), a front frame box (2), a rear frame box jaw (3), a rear frame box (4), and a spinning wheel (5), characterized in that, The spinning method includes the following steps: S1. Prepare a pipe with a length of more than twice the length of the target metal high-pressure short gas cylinder. The pipe is a hollow cylindrical pipe with openings on both sides. One side of the pipe is the first side, and the other side is the second side. S2. Use the front frame box (2) to drive the front frame box claw (1) to move so that the front frame box claw (1) clamps the first side of the pipe, and use the rear frame box (4) to drive the rear frame box claw (3) so that the rear frame box claw (3) clamps the second side of the pipe. S3. The front frame box (2) provides rotational torque to rotate the pipe and spins the pipe at the opening on the first side of the pipe through the spinning wheel (5) to form the first bottle head (6). S4. Turn the pipe that has been spun on one side around, and use the front frame box (2) to drive the front frame box claw (1) to move so that the front frame box claw (1) clamps the second side of the pipe. Use the rear frame box (4) to drive the rear frame box claw (3) so that the rear frame box claw (3) clamps the first side of the pipe. S5. The front frame box (2) provides rotational torque to rotate the pipe and spins the pipe at the opening on the second side of the pipe through the spinning wheel (5) to form the second bottle head (7). S6. Cut the pipe that has been spun on both sides in the middle to form two parts. One side of one part is the first bottle head (6) and the other side is the third side with an opening. One side of the other part is the second bottle head (7) and the other side is the fourth side with an opening. Connect the first bottle head (6) and the second bottle head (7) together to form a connecting assembly. One side of the connecting assembly is the third side and the other side is the fourth side. S7. Using the front frame box (2) to drive the front frame box claw (1) to move so that the front frame box claw (1) clamps the third side of the connecting assembly, and using the rear frame box (4) to drive the rear frame box claw (3) so that the rear frame box claw (3) clamps the fourth side of the connecting assembly; the operation of the front frame box (2) provides rotational torque to make the connecting assembly rotate, and the spinning wheel (5) rotates to spin at the opening on the third side of the connecting assembly to form the third bottle head (8). S8. Turn the connecting assembly around, use the front frame box (2) to drive the front frame box jaws (1) to move so that the front frame box jaws (1) clamp the fourth side of the connecting assembly, use the rear frame box (4) to drive the rear frame box jaws (3) so that the rear frame box jaws (3) clamp the third side of the connecting assembly; the operation of the front frame box (2) provides rotational torque to make the connecting assembly rotate, and the spinning wheel (5) rotates to spin at the opening on the fourth side of the connecting assembly to form the fourth bottle head (9). S9. The connecting components that have been spun on both sides are unloaded from the heavy spinning equipment and sent into the heat treatment furnace for heat treatment. After the heat treatment is completed, the first bottle head (6) and the second bottle head (7) are cut to obtain two target metal high-pressure short gas cylinders.

2. The spinning method for a high-pressure short metal gas cylinder according to claim 1, characterized in that, In step S1, a pipe with a length twice that of the target high-pressure short metal cylinder is prepared.

3. The spinning method for a short metal high-pressure gas cylinder according to claim 1, characterized in that, In step S2, when the front frame box claw (1) clamps the first side of the pipe, the front frame box claw (1) extends out of the opening near the first side.

4. The spinning method for a short metal high-pressure gas cylinder according to claim 1, characterized in that, In step S4, when the front frame box claw (1) clamps the second side of the pipe, the front frame box claw (1) extends out of the opening near the second side.

5. The spinning method for a short metal high-pressure gas cylinder according to claim 1, characterized in that, In step S6, the first bottle head (6) and the second bottle head (7) are connected together by welding or fastener connection to form a connecting assembly.

6. The spinning method for a short metal high-pressure gas cylinder according to claim 1, characterized in that, In step S7, when the front frame box claw (1) clamps the third side of the connecting assembly, the front frame box claw (1) extends out of the opening near the third side.

7. The spinning method for a short metal high-pressure gas cylinder according to claim 1, characterized in that, In step S8, when the front frame box claw (1) clamps the fourth side of the connecting assembly, the front frame box claw (1) extends out of the opening near the fourth side.

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