Skew rolling and multi-piercing rolling combined type common roller for ultra-large-diameter seamless steel pipe
By designing a multi-threaded and rolled joint-shaped common rolling roll for super-large diameter seamless steel pipes, the problems of high equipment investment costs and complex production lines in the existing technology are solved, and the steel pipes are rolled multiple times on one production line are realized, which reduces the equipment Investment cost and footprint.
Patent Information
- Application Number
- CN202411136391.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-02-14
AI Technical Summary
In the prior art, the multiple-thread rolling process of super-large diameter seamless steel pipes requires multiple sets of supporting perforation lines and rolling pipelines, resulting in high equipment investment costs, large plant area, and it is difficult to achieve multiple-thread rolling on one production line.
A common common rolling roll for super-large diameter seamless steel pipes is designed. Through the reasonable combination of the inlet section, rolling belt and outlet section, reasonable inlet cone section, outlet one cone section and outlet two cone are set up. The tapered angle of the section roller surface realizes multiple penetration of steel pipes on a production line.
It effectively reduces the cost of equipment investment, simplifies the layout of production lines, reduces the floor area of the equipment factory, and realizes multiple rolling of super-large diameter seamless steel pipes on a production line, ensuring the quality and production efficiency of steel pipes.
Smart Images
Figure CN119426369A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of hot-rolled seamless steel pipes, and in particular to a common rolling roll for multiple piercing and rolling combined with an oblique rolling method for ultra-large diameter seamless steel pipes. Background Art
[0002] With the growth of demand for ultra-large diameter seamless steel pipes in my country's ultra-high temperature and high pressure petroleum and petrochemical industries, power industry, large machinery industry, marine engineering, etc., The development of seamless steel pipes has become a trend.
[0003] In the prior art, ultra-large diameter seamless steel pipes generally adopt a hot rolling multiple-piercing process, in which the rough pipe after being pierced by the oblique rolling piercing machine line enters the second supporting oblique rolling tube rolling mill line for secondary tube rolling, or enters the third supporting oblique rolling leveling mill line for tertiary tube rolling. This results in a large joint structural configuration of multiple sets of perforating lines, tube rolling lines and other supporting equipment, a large plant area, and huge capital investment in equipment.
[0004] The roller is one of the important deformation tools for oblique rolling and piercing, and its function is to drive the tube billet to rotate and move forward. The entrance cone section is used to pull in the tube billet and realize piercing and rolling of the tube billet. The exit cone section is used to reduce the wall of the steel tube, flatten the surface of the steel tube, make the wall thickness of the steel tube uniform, and complete the rounding of the steel tube. The rolling belt plays a role in balancing the transition from the entrance cone section to the exit cone section. In summary, how to provide a combined common roller for multiple piercing and rolling of ultra-large diameter seamless steel tubes, so that multiple piercing and rolling to ultra-large diameter can be achieved on one production line? The common rolling rollers for seamless steel pipes have become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention
[0005] The purpose of the present invention is to provide a common rolling roller for multiple oblique rolling combined with ultra-large diameter seamless steel pipes, so that ultra-large diameter seamless steel pipes can be made by multiple rolling on a production line to meet the process technology requirements of multiple rolling on the same equipment line and reduce equipment investment costs.
[0006] In order to solve the above technical problems, the embodiments of the present invention provide a technical solution, including:
[0007] A combined common roller for oblique rolling and multiple piercing of an ultra-large diameter seamless steel pipe comprises an inlet section, a rolling belt, and an outlet section connected in sequence, wherein the inlet section comprises a guide arc section and an inlet cone section arranged in sequence, and the outlet section comprises an outlet cone section 1 and an outlet cone section 2 connected in sequence, and a central axial hole is axially penetrated in the center of the combined common roller; the inlet section, the rolling belt, and the outlet cone section 1 are provided with knurling; the inlet cone section of the combined common roller and the surface of the rolling belt are provided with an inlet section roller surface cone angle a 入The combined common roll outlet cone section and the outer surface of the rolled strip are provided with an outlet cone section roll surface cone angle a 出1 The outer surfaces of the outlet second cone section and the outlet first cone section of the combined common roller are provided with an outlet second cone section roller surface cone angle a 出2 It is 3.5°~5°.
[0008] Through the reasonable combination of the entrance section, rolling strip and exit section, as well as the reasonable setting of the cone angle of the entrance cone end roller, the cone angle of the exit cone end roller, and the cone angle of the exit cone end roller, the combined common rolling roll is used to realize the production of ultra-large diameter seamless steel pipes on a single piercing and rolling equipment line, effectively reducing the equipment investment cost.
[0009] Furthermore, the diameter D of the round tube billet used for oblique rolling and perforation to make seamless steel pipe 坯 ≤1300mm, the head diameter is D 顶 The rolled wall thickness of the maximum expanded outer diameter is S, the outer diameter of the first perforated tube is D1, the outer diameter of the second perforated tube is D2, the outer diameter of the third perforated tube is D3, the outer diameter of the fourth perforated tube is D4, and the length of the inlet section is L 入 Set to:
[0010] Furthermore, the outlet section length L 出(总) for:
[0011] Furthermore, the length of the outlet cone section is:
[0012] Furthermore, the roller surface of the second cone section at the outlet is smooth, and the length of the second cone section at the outlet is l 出2 ≈L 出(总) -l 出1 .
[0013] Furthermore, the circular arc radius of the guide arc segment is R400mm-R600mm, and the axial length of the guide arc segment is 150mm-200mm.
[0014] Furthermore, the axial width of the rolled strip is 50 mm to 80 mm, and the diameter D at the center of the roll is 辊 for
[0015] Furthermore, the knurling spacing is 3 mm, the knurling depth of the inlet section is 0.6 mm to 1.0 mm, and the knurling depth of the rolled strip and the outlet cone section is 0.3 mm to 0.5 mm.
[0016] Furthermore, the feed angle β of the combined common roller is 6.5° to 9°, and the rolling angle γ of the combined common roller is 12° to 15°.
[0017] Furthermore, the outer edge of the axial end of the combined common roller is provided with a chamfer, and the chamfer radius is r35mm to r45mm.
[0018] Compared with the prior art, the combined common roller for super-large diameter seamless steel pipe provided by the present invention realizes the production of super-large diameter seamless steel pipe on one piercing and rolling equipment line by using the combined common roller, through the reasonable matching of the entrance section, the rolling belt and the exit section, as well as the reasonable setting of the cone angle of the entrance cone end roller surface, the cone angle of the exit first cone end roller surface and the cone angle of the exit second cone end roller surface, thereby effectively reducing the equipment investment cost, breaking through the process limitation of the independent multiple piercing and rolling of super-large diameter seamless steel pipe using multiple matching production lines in the prior art, simplifying the layout of the production line, reducing the floor space occupied by the equipment plant and reducing the equipment investment cost; through the knurling setting of the roller surface of the entrance cone section of the combined common roller, the pulling force and friction force of the roller and the tube blank or steel pipe during the rolling process are guaranteed; through the chamfering setting of the outer edge of the axial end of the combined common roller for seamless steel pipe, the concentration effect of the stress source point in the hot and cold working state of the roller of the large workpiece is reduced. By setting the two conical sections of the combined common roller outlet as smooth surfaces, it is ensured that the surface of the steel pipe is rounded and flattened, and the roughness after the deformation decreases meets the quality requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.
[0020] Figure 1 1 is a schematic diagram of a partial cross-sectional structure of a combined common roller for an ultra-large diameter seamless steel pipe according to an embodiment of the present invention;
[0021] Figure 2 It is a cross-sectional view of a combined common rolling roll for ultra-large diameter seamless steel pipes in an embodiment of the present invention.
[0022] Explanation of the reference numerals: 10, combined common roller; 1, entrance section; 11, guide arc section; 12, entrance cone section; 2, rolled strip; 3, exit section; 31, exit cone section 1; 32, exit cone section 2; 4, center shaft hole; 41, center axis of the shaft hole; 5, chamfer; 20, plug; 201, center axis of the plug. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present invention, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection in the claims of the present application can be implemented.
[0024] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0025] like Figure 1-2 As shown, in an embodiment of the present invention, a combined common roller 10 for an ultra-large diameter seamless steel pipe is provided. The combined common roller 10 comprises an inlet section 1, a rolling strip 2, and an outlet section 3 which are connected in sequence. The inlet section 1 comprises a guide arc section 11 and an inlet cone section 12 which are arranged in sequence. The outlet section 3 comprises an outlet cone section 1 31 and an outlet cone section 2 32 which are connected in sequence. A central shaft hole 4 is axially penetrated through the central part of the combined common roller 10. The outer periphery of the guide arc section 11 of the combined common roller 10 is arc-shaped. The arc radius of the guide arc section 11 is R400mm-R600mm, and the axial length ln of the guide arc section 11 is 150mm-200mm. The inlet cone section 12 of the combined common roller 10 and the surface of the rolling strip 2 are provided with a roller surface cone angle a of the inlet cone section 12. 入 The outlet cone section 31 of the combined common roll 10 and the outer surface of the rolled strip 2 are provided with a roll surface cone angle a of the outlet cone section 31. 出1 The outer surfaces of the outlet second cone section 32 and the outlet first cone section 31 of the combined common roller 10 are provided with a roller surface cone angle a of the outlet second cone section 32 出2The angle is 3.5°~5°. The outer surfaces of the entrance cone section 12, the rolling strip 2 and the exit cone section 31 of the combined common roller 10 are provided with knurling. Preferably, the knurling depth of the entrance cone section 12 is 0.6mm~1mm, and the knurling spacing is 3mm. The knurling depth of the rolling strip 2 and the exit cone section 31 is 0.3mm~0.5mm, and the knurling spacing is 3mm. The setting of the guide arc section 11 of the combined common roller 10 ensures the smooth biting in the process of tube perforation and rolling advancement; the depth of the knurling setting of the roller surface of the entrance cone section 12 of the combined common roller 10 is 0.6mm~1mm, which increases the pulling force and friction force of the roller and the tube during the rolling process; the depth of the knurling setting of the roller surface of the rolling strip 2 and the exit cone section 31 of the combined common roller 10 is set to 0.3mm~0.5mm, which ensures that the friction force during the rolling process and the roughness of the steel pipe surface after the wall reduction deformation decrease meet the quality requirements.
[0026] In a preferred embodiment, the axial end outer edge of the combined common rolling roller 10 for super-large diameter seamless steel pipes provided by the present invention is provided with a chamfer 5, and the radius of the chamfer 5 is r35mm~r45mm. The setting of the chamfer 5 is beneficial to reducing the stress source point concentration effect of the combined common rolling roller 10 under hot and cold working conditions.
[0027] In one embodiment, it relates to a combined common roller 10 for an ultra-large diameter seamless steel pipe, wherein the feed angle β formed between the shaft hole center axis 41 of the combined common roller 10 and the head center axis 201 is 6.5° to 9°, the rolling angle γ of the combined common roller 10 is 12° to 15°, the rolling strip 2 of the combined common roller 10 has a width of 50 mm to 80 mm, and the roller diameter D at the center of the rolling strip 2 is 1.5 mm to 2.0 mm. 辊 for The diameter of the solid round tube billet used for oblique rolling and perforation to make seamless steel pipe is D 坯 , the diameter D of the solid round tube 坯 ≤1300mm, the maximum size of the deformation design of the common roller 10 for multiple piercing and rolling is: the outer diameter of the piercing and rolling tube once Secondary piercing and rolling tube outer diameter Three-time piercing and rolling tube outer diameter Four-time piercing and rolling tube outer diameter Entrance section length L 入 Satisfies the following formula: Exit section length L 出(总) Satisfies the following formula: Preferably, the length L of the outlet section 3 of the combined common roller 10 is 出(总) The length of the exit cone section 31 of the combined common roll 10 is not less than the outer diameter deformation rolling length requirement of the first perforation rolling, the second perforation rolling, the third perforation rolling or the fourth perforation rolling.出1 、Pier 20 diameter D 顶 And the rolled wall thickness S of the maximum expanded outer diameter should satisfy the following formula: Preferably, the outlet cone section 1 of the combined common roller 10 出1 Not less than the outer diameter deformation rolling length requirements for single-perforation rolling, double-perforation rolling, triple-perforation rolling or quadruple-perforation rolling.
[0028] In one embodiment, the inlet cone section 11, the rolling strip 2, and the outlet cone section 31 of the combined common roller 10 are all provided with knurling, the knurling spacing is 3mm, the knurling depth of the inlet cone section 11 is 0.6mm-1.0mm, the knurling depth of the rolling strip 2 and the outlet cone section 31 is 0.3mm-0.5mm, and the roller surface of the outlet cone section 32 is not knurled, that is, the roller surface of the outlet cone section 32 is smooth, and the outer surfaces of the outlet cone section 32 and the outlet cone section 31 of the combined common roller 10 are provided with a cone angle a of the roller surface of the outlet cone section 32 出2 is 3.5°~5°, and the length l of the outlet second cone section 32 出2 ≈L 出(总) -l 出1 The cone angle a of the inlet cone section 12 of the combined common roller 10 is 入 The setting of the rolling strip 2, the exit cone section 31 roller surface cone angle a 出1 The setting of the outlet second cone section 32 roller surface cone angle a 出2 The setting of the angle and the matching setting of the feed angle and the rolling angle ensure the top extension in the rolling deformation process, the balance and stability of the piercing and rolling, the uniform wall thickness in the steel pipe deformation process, and the roundness and flatness of the outer diameter surface quality of the steel pipe.
[0029] Compared with the prior art, the combined common roller 10 for super-large diameter seamless steel pipes provided by the present invention realizes the production of super-large diameter seamless steel pipes on a single piercing and rolling equipment line by using the combined common rollers through the reasonable matching of the inlet section, the rolling belt and the outlet section, as well as the reasonable setting of the cone angle of the roller surface at the inlet cone end, the cone angle of the roller surface at the outlet cone end one and the cone angle of the roller surface at the outlet cone end two, thereby effectively reducing the equipment investment cost, breaking through the process limitation of the independent multiple piercing and rolling of super-large diameter seamless steel pipes using multiple matching production lines in the prior art, simplifying the layout of the production line, reducing the floor space occupied by the equipment plant and reducing the equipment investment cost; the knurling setting of the roller surface of the inlet cone section 12 of the combined common roller 10 ensures the pulling force and friction force of the roller and the tube blank or steel pipe during the rolling process; the chamfering 5 setting of the outer edge of the axial end of the combined common roller 10 for seamless steel pipes reduces the concentration effect of stress source points in the hot and cold working state of the roller of the large workpiece. By setting the roller surface of the two cone sections 32 at the outlet of the combined common roller 10 to be smooth, it is ensured that the roughness of the steel pipe surface after rounding and flattening and decreasing deformation meets the quality requirements.
[0030] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.
Claims
1. A common roll for multiple piercing and rolling combined rolls for super large diameter seamless steel pipes, characterized in that: The invention comprises an inlet section (1), a rolling strip (2), and an outlet section (3) connected in sequence, wherein the inlet section (1) comprises a guide arc section (11) and an inlet cone section (12) arranged in sequence, and the outlet section (3) comprises an outlet cone section (31) and an outlet cone section (32) connected in sequence, and a central axial hole (4) is axially penetrated through the central part of the combined common roller (10); the inlet cone section (12), the rolling strip (2), and the outlet cone section (31) are provided with knurling; the surfaces of the inlet cone section (12) and the rolling strip (2) of the combined common roller (10) are provided with a roller surface cone angle a of the inlet cone section (12) 入 The combined common roller (10) has an outlet cone section (31) and an outer surface of the rolled strip (2) with a roller surface cone angle a of 2.5° to 3.5°. 出1 The outer surfaces of the outlet second cone section (32) and the outlet first cone section (31) of the combined common roller (10) are provided with a roller surface cone angle a of the outlet second cone section (32) 出2 It is 3.5°~5°.
2. The common roll for the multiple skew rolling combined rolling for the super-large diameter seamless steel pipe according to claim 1 is characterized in that: The diameter of the round tube billet used for oblique rolling and perforation to make seamless steel pipe is D 坯 ≤1300mm, the diameter of the plug (20) is D 顶 The rolled wall thickness of the maximum expanded outer diameter is S, the outer diameter of the first perforated tube is D1, the outer diameter of the second perforated tube is D2, the outer diameter of the third perforated tube is D3, the outer diameter of the fourth perforated tube is D4, and the length of the inlet section (1) is L 入 Set to:
3. The common roll for the multiple skew-rolling joint rolling for the super-large diameter seamless steel pipe according to claim 2 is characterized in that: The length of the outlet section (3) is L 出(总) for:
4. The common roll for the multiple piercing and rolling combined type for the super large diameter seamless steel pipe according to claim 3 is characterized in that: The length of the outlet cone section (31) is:
5. The common roll for the multiple skew-rolling joint rolling for the super-large diameter seamless steel pipe according to claim 4 is characterized in that: The roller surface of the outlet second cone section (32) is smooth, and the length of the outlet second cone section (32) is l 出2 ≈L 出(总) -l 出1 .
6. The common roll for multiple skew rolling combined rolling for super large diameter seamless steel pipe according to claim 1, characterized in that: The circular arc radius of the guide arc segment (11) is R400 mm to R600 mm, and the axial length of the guide arc segment (11) is 150 mm to 200 mm.
7. The common roll for multiple skew rolling and joint rolling for super large diameter seamless steel pipe according to claim 1, characterized in that: The axial width of the rolled strip (2) is 50 mm to 80 mm, and the diameter D at the center of the roller is 辊 for 8. The common roll for multiple skew rolling and joint rolling for super large diameter seamless steel pipe according to claim 1, characterized in that: The knurling spacing is 3 mm, the knurling depth of the inlet cone section (12) is 0.6 mm to 1.0 mm, and the knurling depths of the rolled strip (2) and the outlet cone section (31) are 0.3 mm to 0.5 mm.
9. The common roll for multiple skew-rolling joint rolling for ultra-large diameter seamless steel pipe according to claim 1, characterized in that: The feed angle β of the combined common roller (10) is 6.5° to 9°, and the rolling angle γ of the combined common roller (10) is 12° to 15°.
10. The common roll for multiple skew-rolling combined rolling for super-large diameter seamless steel pipe according to any one of claims 1 to 9, characterized in that: The outer edge of the axial end of the combined common roller (10) is provided with a chamfer (5), and the radius of the chamfer (5) is r35mm-r45mm.