Barrel rolling method

Abstract

The invention discloses a barrel rolling method. The barrel rolling method comprises the following steps that S1, blanking is conducted, specifically, the length L of a plate is determined according to the thickness of the plate; the blanking length L of the plate is equal to pi (Di + delta)-pi delta / 4, Di is the theoretical inner diameter of the barrel, and delta is the thickness of the plate; s2, the obtained plate is placed on a plate rolling machine to be rolled; and S3, the rolled barrel is unloaded from the plate rolling machine, and the two rolled ends of the barrel are welded according to the V-shaped outer groove welding process requirement. The method has the advantages that the length of the plate can be determined in advance before rolling, the two ends of the rolled plate can be just welded together according to the V-shaped outer groove welding process requirement, excess materials do not exist, material waste is reduced, the excess materials do not need to be cut, the reworking and cutting procedures are omitted, and the barrel rolling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cylinder rolling technology, in particular to a cylinder rolling method. BACKGROUND

[0002] The plate rolling forming is the main manufacturing method of the pressure vessel cylinder, and the length of the cylinder plate is determined according to the middle formula, that is, the length is calculated according to the middle formula: l=π(Di+δ), and then the welding groove required by the welding is processed, and then the plate rolling machine is used for cylinder segment rolling. After the cylinder segment rolling is completed, the interface is welded. At present, the interface welding adopts two ways of internal breaking and external bevel welding. For the manufacturing of small diameter container cylinder, the internal welding is not convenient, and the external bevel welding is adopted in the manufacturing of the container cylinder. After the external bevel welding is completed, although the inner diameter size of the cylinder can be guaranteed, the actual size of the outer diameter of the cylinder is larger than the theoretical size of the outer diameter of the cylinder during the rolling forming of the cylinder, and the material needs to be removed again to process the groove for rework, which not only causes material waste, but also wastes time and affects the cylinder rolling efficiency. SUMMARY

[0003] The technical problem to be solved by the present application is how to reduce material waste and improve the cylinder rolling efficiency.

[0004] To solve the above technical problems, the present application provides the following technical scheme: A cylinder rolling method, specifically comprising the following steps: S1: blanking: determining the length L of the plate according to the thickness of the plate; The length L of the plate blanking is π(Di+δ)-πδ / 4, wherein Di is the theoretical inner diameter of the cylinder, and δ is the thickness of the plate; S2: placing the obtained plate on the plate rolling machine to roll the plate; S3: dismounting the rolled cylinder from the plate rolling machine, and welding the two ends of the rolled cylinder according to the V-shaped external bevel welding process requirement.

[0005] The cylinder rolling method in the present application can determine the length of the plate in advance before rolling, and the two ends of the rolled plate can be welded together through the V-shaped external bevel welding process requirement, which not only has no excess material and reduces material waste, but also does not need to cut the excess material, saves the rework and cutting process, and improves the cylinder rolling efficiency.

[0006] Preferably, the thickness δ of the plate is ≤25mm.

[0007] Preferably, the V-shaped external bevel is a single 30° bevel.

[0008] Compared with the prior art, the present application has the following advantages: The length of the plate can be determined in advance before rolling by the cylinder rolling method, and the two ends of the rolled plate can be welded together by V-shaped outer bevel welding process, so that the plate has no excess material, reduces material waste, and does not need to be cut, thereby saving the rework and cutting process, and improving the cylinder rolling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 Figure 1 is a schematic view of the welding structure of the cylinder in Embodiment 1 of the present application. DETAILED DESCRIPTION

[0010] For the convenience of those skilled in the art to understand the technical scheme of the present application, the technical scheme of the present application will be further described in conjunction with the drawings of the specification.

[0011] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0012] In the present application, unless otherwise explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0013] Embodiment 1 The present embodiment discloses a cylinder rolling method, specifically comprising the following steps: Specifically comprising the following steps: S1: blanking: determining the length L of the plate according to the thickness of the plate; when the thickness δ of the plate is ≤25mm, the length L of the plate blanking is L=π(Di+δ)-πδ / 4, wherein Di is the theoretical inner diameter of the cylinder.

[0014] It should be noted that, in the plate rolling, according to the formula L=π(Di+δ)-πδ / 4, the length of the plate is determined according to the thickness of the plate, and the length of the plate is determined according to the thickness of the plate. Figure 1The material is cut at position δ / 2 of the middle layer. Theoretically, the area outside the middle layer is in a stretched state, and the area inside the middle layer is in a compressed state. Taking the middle layer as the dividing point, the average position of the compressed part is at half of δ / 2, that is, at position δ / 4. Therefore, the average compression amount of the perimeter is πδ / 4. Hence, the length of the material cut L = π(Di+δ) - πδ / 4.

[0015] In this embodiment, the theoretical inner diameter of the cylinder is Di=800mm, the thickness of the plate is δ=16mm, and the length of the plate cutting is L=π(Di+δ)-πδ / 4=2551mm.

[0016] S2: Place the sheet material obtained after cutting onto the plate rolling machine and roll the sheet material into a round shape in one go.

[0017] S3: Remove the rolled cylinder 1 from the plate rolling machine, see reference. Figure 1 Welding was performed on both ends of the rolled cylinder 1 according to the V-shaped outer bevel welding process requirements. The V-shaped outer bevel 101 is a single-sided 30° bevel. After the bevel welding was completed, the actual outer diameter of the cylinder 1 was measured to be d=831mm, which is 1mm different from the theoretical outer diameter of the cylinder D=832mm. This is within the error range (generally during the rolling of the cylinder) and meets the rolling requirements of the cylinder.

[0018] The length of the sheet metal cut using the existing Chinese economic formula is l=π(Di+δ)=2563mm, and according to... Figure 1 The welding process for the V-shaped outer bevel requires welding. The final measured outer diameter of the rolled cylinder 1 is 846mm, which is 14mm different from the theoretical outer diameter D=832mm. This results in an outer diameter that is larger than the theoretical outer diameter of the cylinder, which cannot meet the rolling requirements. It is necessary to cut off the material and rework the welding, which affects the rolling efficiency of the cylinder.

[0019] The cylinder rolling method in this embodiment can determine the length of the plate in advance before rolling. The two ends of the rolled plate can be welded together by the V-shaped outer bevel welding process. This not only eliminates excess material and reduces material waste, but also eliminates the need to cut excess material, saving rework and cutting processes and improving the rolling efficiency of cylinder 1.

[0020] Example 2 In this embodiment, the theoretical inner diameter of the cylinder is Di=500mm, the thickness of the plate is δ=8mm, the theoretical outer diameter of the cylinder is D=516mm, the length of the plate cutting is L=π(Di+δ)-πδ / 4=1590mm, and welding is carried out according to the V-shaped outer bevel welding process requirements. The actual outer diameter of the cylinder is measured to be d=516mm.

[0021] Example 3 In this embodiment, the theoretical inner diameter of the cylinder is Di=500mm, the thickness of the plate is δ=12mm, the theoretical outer diameter of the cylinder is D=524mm, the length of the plate cutting is L=π(Di+δ)-πδ / 4=1599mm, and welding is carried out according to the V-shaped outer bevel welding process requirements. The actual outer diameter of the cylinder is measured to be d=525mm.

[0022] Example 4 In this embodiment, the theoretical inner diameter of the cylinder is Di=800mm, the thickness of the plate is δ=10mm, the theoretical outer diameter of the cylinder is D=820mm, the length of the plate cutting is L=π(Di+δ)-πδ / 4=2537mm, and welding is carried out according to the V-shaped outer bevel welding process requirements. The actual outer diameter of the cylinder is measured to be d=821mm.

[0023] Example 5 In this embodiment, the theoretical inner diameter of the cylinder is Di=1000mm, the thickness of the plate is δ=12mm, the theoretical outer diameter of the cylinder is D=1024mm, the length of the plate cutting is L=π(Di+δ)-πδ / 4=3170mm, and welding is carried out according to the V-shaped outer bevel welding process requirements. The actual outer diameter of the cylinder is measured to be d=1023mm.

[0024] Example 6 In this embodiment, the theoretical inner diameter of the cylinder is Di=1000mm, the thickness of the plate is δ=18mm, the theoretical outer diameter of the cylinder is D=1036mm, the length of the plate cutting is L=π(Di+δ)-πδ / 4=3184mm, and welding is carried out according to the V-shaped outer bevel welding process requirements. The actual outer diameter of the cylinder is measured to be d=1038mm.

[0025] Example 7 In this embodiment, the theoretical inner diameter of the cylinder is Di=1200mm, the thickness of the plate is δ=12mm, the theoretical outer diameter of the cylinder is D=1224mm, the length of the plate cutting is L=π(Di+δ)-πδ / 4=3798mm, and welding is carried out according to the V-shaped outer bevel welding process requirements. The actual outer diameter of the cylinder is measured to be d=1226mm.

[0026] Example 8 In this embodiment, the theoretical inner diameter of the cylinder is Di=1200mm, the thickness of the plate is δ=24mm, the theoretical outer diameter of the cylinder is D=1248mm, the length of the plate cutting is L=π(Di+δ)-πδ / 4=3826mm, and welding is carried out according to the V-shaped outer bevel welding process requirements. The actual outer diameter of the cylinder is measured to be d=1249mm.

[0027] The results of the rolled cylinders from Examples 1-8 are shown in Table 1:

[0028] Table 1 As can be seen from Table 1 above, the actual outer diameter d of the cylinder obtained by the actual cutting size L is almost the same as the theoretical outer diameter D of the cylinder, with an error of basically between 1-2 mm, which meets the requirements for cylinder rolling. However, in each corresponding embodiment, the cutting size l obtained by the Zhongjing formula is larger than the actual cutting size L in the corresponding embodiment, which results in the actual outer diameter d of the cylinder obtained by the Zhongjing formula being larger than the theoretical outer diameter D of the cylinder, thus failing to meet the requirements for cylinder rolling.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] The above embodiments are merely examples of implementation methods of the invention. The scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A method for rolling a cylindrical body, characterized in that: Specifically, the steps include the following: S1: Cutting: Determine the length L of the board based on its thickness; The length of the sheet material cut is L = π(Di+δ)-πδ / 4, where Di is the theoretical inner diameter of the cylinder and δ is the thickness of the sheet material. S2: Place the obtained board material onto a plate rolling machine to roll it into a circle; S3: Remove the rolled cylinder from the plate rolling machine and weld the two ends of the rolled cylinder according to the V-shaped outer bevel welding process requirements.

2. The method for rolling a cylindrical body according to claim 1, characterized in that: The thickness of the sheet material is δ≤25mm.

3. The method for rolling a cylindrical body according to claim 1, characterized in that: The V-shaped outer bevel is a single-sided 30° bevel.

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