CN113634601B - Roller shape for improving surface quality of Assel rolling mill rolled steel pipe - Google Patents
Roller shape for improving surface quality of Assel rolling mill rolled steel pipe Download PDFInfo
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- CN113634601B CN113634601B CN202110937426.XA CN202110937426A CN113634601B CN 113634601 B CN113634601 B CN 113634601B CN 202110937426 A CN202110937426 A CN 202110937426A CN 113634601 B CN113634601 B CN 113634601B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 67
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 230000007704 transition Effects 0.000 claims abstract description 41
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims description 22
- 230000007547 defect Effects 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 102220558276 Lipocalin-like 1 protein_C45W_mutation Human genes 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
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- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention provides a roller shape for improving the surface quality of a Assel rolling mill rolled steel pipe, which relates to the technical field of steel processing, and is sequentially provided with an inlet cone region, a gradual change region and a rolling region from the inlet side to the outlet side of the roller; the gradual change region comprises a first transition arc and a second transition arc, the first transition arc is tangent to the inlet cone region, and the second transition arc is tangent to the rolling region, so that the depth of the internal thread of the steel pipe produced by the roller is less than or equal to 0.2mm; meanwhile, the defects of the inner surface and the outer surface of the steel pipe are reduced by about 8 percent; the rolling deformation resistance is also reduced, and the rolling current is reduced by about 12%.
Description
Technical Field
The invention relates to the technical field of steel processing, in particular to a roller shape for improving the surface quality of a steel tube rolled by a Assel rolling mill.
Background
The internal thread of the steel pipe produced by the prior Assel rolling mill is obvious, can not meet the use requirement of high-precision steel pipes (such as cold-drawing oil cylinder master batch and the like) and affects the beautiful appearance; meanwhile, the instantaneous rolling deformation is large, the inner surface and the outer surface are easy to generate defects such as cracks, and the use and experience of a user are seriously influenced; and the rolling deformation resistance is high, and the requirement on equipment capacity is high.
The traditional Assel pipe mill adopts rollers with inlet cone areas, shoulder areas, rolling areas and the like to roll the steel pipe, the roller shoulder areas are usually two sections of circular arcs with smaller diameters (the diameter of the circular arcs is less than or equal to 40 mm), and the height change is rapid. In the process of rolling the steel pipe by the roller, the instantaneous deformation rate of the steel is faster and the rolling of the material is insufficient due to the influence of the height change of the step. The produced steel pipe has obvious internal threads (the depth is 0.4-0.8 mm), and simultaneously the inner surface and the outer surface are easy to crack; the rolling deformation resistance is large, and the rolling current is large and relatively high.
Disclosure of Invention
The invention aims to provide a roller shape for improving the surface quality of a Assel rolling mill rolled steel pipe, so that the defects of the inner surface and the outer surface of the rolled steel pipe are reduced.
In order to achieve the above object, the present invention provides the following technical solutions: a roller shape for improving the surface quality of a Assel rolling mill rolling steel pipe is sequentially provided with an inlet cone region, a gradual change region and a rolling region from the inlet side to the outlet side of the roller; the transition zone comprises a first transition arc and a second transition arc, the first transition arc is tangent to the inlet cone zone, and the second transition arc is tangent to the rolling zone.
Further, in the roll shape for improving the surface quality of the steel tube rolled by the Assel rolling mill, the inlet cone region comprises a first inlet partition and a second inlet partition, and the second inlet partition is connected with the first transition circular arc; the included angle between the outer surface of the first inlet partition and the axis of the roller is alpha 1, the included angle between the surface of the second inlet partition and the axis of the roller is alpha 2, wherein alpha 2 is larger than alpha 1, and the difference between alpha 1 and alpha 2 is 1-2 degrees.
Further, in the roll shape for improving the surface quality of the steel pipe rolled by the Assel rolling mill, the diameter D 1 of the first transition circular arc is 200mm-500mm, the diameter D 2 of the second transition circular arc is 200mm-500mm, and the diameter D 1 of the first transition circular arc is equal to the diameter D 2 of the second transition circular arc in length.
Further, in the roll shape of the roller for improving the surface quality of the steel pipe rolled by the Assel rolling mill, an included angle alpha 3 between the surface of the rolling area and the axis of the roller is 3 degrees to 5 degrees.
Further, in the roll shape of the roller for improving the surface quality of the steel tube rolled by the Assel rolling mill, an outlet circular pyramid area and an outlet cone area are sequentially arranged between the rolling area and the outlet side of the roller.
Further, in the roll shape of the roller for improving the surface quality of the Assel rolling mill rolled steel pipe, the angle of alpha 1 is 6 degrees to 7 degrees.
Further, in the roll shape of the roller for improving the surface quality of the steel tube rolled by the Assel rolling mill, the center of the second transition arc is located on a straight line L 5, wherein the straight line L 5 is a straight line with an included angle of 4 degrees with the straight line L 6, and the straight line L 6 is a straight line perpendicular to the axis of the roller at a position of 20:27 in the length direction of the roller; the intersection of L 5 and L 6 is located at the outer surface of the roll; closer to the exit side of the roll than L 5,L6.
Further, in the roll shape of the roller for improving the surface quality of the steel tube rolled by the Assel rolling mill, the length of the first inlet partition along the axial direction of the roller is L 1,L1, which is 14% -20% of the total length of the roller.
Further, in the roll shape of the roll for improving the surface quality of the rolled steel pipe by the Assel rolling mill, the length of the rolling area along the axis direction of the roll is L 3,L3, which is 12% -18% of the total length of the roll.
Further, in the roll shape of the roller for improving the surface quality of the steel tube rolled by the Assel rolling mill, the included angle between the surface of the rolling area and the axis of the roller is 4 degrees.
Analysis shows that the invention discloses a roller shape for improving the surface quality of a steel pipe rolled by a Assel rolling mill, and the invention can ensure that the depth of internal threads of the steel pipe produced by the roller is less than or equal to 0.2mm; meanwhile, the defects of the inner surface and the outer surface of the steel pipe are reduced by about 8 percent; the rolling deformation resistance is also reduced, and the rolling current is reduced by about 12%.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a schematic cross-sectional view of a roll configuration in accordance with one embodiment of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the invention and not limitation of the invention. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled," "connected," and "configured" as used herein are to be construed broadly and may be, for example, fixedly connected or detachably connected; can be directly connected or indirectly connected through an intermediate component; either a wired electrical connection, a radio connection or a wireless communication signal connection, the specific meaning of which terms will be understood by those of ordinary skill in the art as the case may be.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," "third," and "fourth," etc. are used interchangeably to distinguish one component from another and are not intended to represent the location or importance of the individual components.
As shown in fig. 1, according to an embodiment of the present invention, there is provided a roll shape of a roll for improving the surface quality of a steel tube rolled by a Assel rolling mill, which is provided with an inlet cone region, a transition region and a rolling region in order from an inlet side to an outlet side of the roll; the transition zone comprises a first transition arc and a second transition arc, the first transition arc is tangent to the inlet cone zone, the second transition arc is tangent to the rolling zone, in fig. 1, the inlet cone zone is the part marked with 'A' in the figure, the transition zone is the part marked with 'B' in the figure, and the rolling zone is the part marked with 'C' in the figure.
Preferably, the inlet cone region comprises a first inlet partition and a second inlet partition, and the second inlet partition is connected with the first transition circular arc; the included angle between the outer surface of the first inlet partition and the axis of the roller is alpha 1, the included angle between the surface of the second inlet partition and the axis of the roller is alpha 2, wherein alpha 2 is larger than alpha 1, the difference between alpha 1 and alpha 2 is 1-2 degrees, the length of the second inlet partition along the axis direction of the roller is not fixed, the second inlet partition is only required to be tangent to the first transition circular arc, and the length of the second inlet partition is determined by the radian of the first transition circular arc.
Preferably, the diameter D 1 of the first transition arc is 200mm-500mm, such as 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, and the diameter D 2 of the second transition arc is 200mm-500mm, such as 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, and a steel pipe having the surface quality described in the present invention can be obtained by using an arc in the above-mentioned size range, and a steel pipe produced by conventional roll forms tends to have a remarkable internal thread with an inner and outer surface being easily broken, while a steel pipe having a size larger than this size is disadvantageous in roll curve distribution. The diameter D 1 of the first transition arc is equal to the length of the diameter D 2 of the second transition arc.
Preferably, the angle α 3 between the surface of the rolling zone and the roll axis is 3 ° -5 °, for example 3.0 °, 3.5 °, 4.0 °, 4.5 °, 5.0 °, which is in the range of the mating rolling mill design, the pass line is parallel to the steel pipe centerline after a 4 ° roll is installed; and + -1 DEG is the optimal adjustment interval.
Preferably, an outlet circular cone region and an outlet cone region are sequentially arranged between the rolling region and the outlet side of the roller, in fig. 1, the outlet circular cone region is a part marked with "D" in the drawing, and the outlet cone region is a part marked with "E" in the drawing.
Preferably, the angle of alpha 1 is 6-7 degrees, such as 6.0 degrees, 6.5 degrees and 7.0 degrees, the angle range is convenient for the steel pipe to bite, too small can lead to the steel pipe to be difficult to bite, too large can lead to the instantaneous deformation of the steel pipe to be large, and can have adverse effects on the surface quality of the steel pipe and rolling current.
Preferably, the center of the second transition arc is located on a straight line L 5, where the straight line L 5 is a straight line with an included angle of 4 ° with the straight line L 6, and the straight line L 6 is 20 ° in the length direction of the roll: a straight line perpendicular to the axis of the roller at 27, namely a connection between the 200 part and the 270 part in fig. 1, wherein the straight line L 6 is used as a fixed line of the center of a second transition circular arc, and the intersection point of L 5 and L 6 is positioned at the outer surface of the roller; closer to the exit side of the roll than L 5,L6.
Preferably, the length of the first inlet partition along the axial direction of the roller is L 1, the length of the second inlet partition along the axial direction of the roller is L 2, the length of the outlet cone region along the axial direction of the roller is L 4,L1, and the length of the outlet cone region along the axial direction of the roller is 14% -20% of the total length of the roller, for example, 14%, 14.5%, 15.0%, 15.5%, 16.0%, 16.5%, 17.0%, 17.5%, 18.0%, 18.5%, 19.0%, 19.5%, 20.0% and the range of 14% -20% ensures that the steel pipe has enough reducing interval after being bitten so that the steel pipe reaches the ideal size during rolling. If the length of the section is shorter, the angle is increased to ensure biting, so that the angle problem is generated; if the length is longer, the rolling time of the part is longer, the steel temperature is lower, and other areas are occupied to cause other adverse effects.
Preferably, the length of the rolling area along the axial direction of the roller is L 3,L3 which is 12% -18% of the total length of the roller, such as 12.0%, 12.5%, 13.0%, 13.5%, 14.0%, 14.5%, 15.0%, 15.5%, 16.0%, 16.5%, 17.0%, 17.5% and 18.0%, and the range of 12% -18% is selected to ensure that the steel pipe is sufficiently rolled, too short and not sufficiently rolled, too long and not sufficiently expanded after rolling, and even occupies other areas, thereby causing other adverse effects.
Preferably, the surface of the rolling zone is at an angle of 4 ° to the axis of the roll.
Example 1
In this embodiment, L 1 is 19.04% of the length of the roll, the angle of α 1 is 6.5 °, the angle of α 2 is 8 ° (6.5 ° +1.5 °), the lengths of the diameter D 1 and the diameter D 2 are 200mm, L 3 is 12.73% of the length of the roll, and when the 168×16 gauge 20# steel pipe is rolled according to the present invention, the quality of the inner and outer surfaces of the steel pipe is significantly improved, and specific please see table 1:
table 1 # 20 steel rolling effect table
| Comparison item | The invention is that | Traditional roller type |
| Depth of internal thread | 0.1～0.25mm | 0.4～0.6mm |
| Defects of inner and outer surfaces | 4.73％ | 12.65％ |
| Rolling current | 4192A | 4268A |
Example 2
In this example, L 1 is 19.04% of the length of the roll, the angle of α 1 is 6.0 °, the angle of α 2 is 7.5 ° (6.0 ° +1.5 °), the lengths of diameter D 1 and diameter D 2 are both 400mm, L 3 is 14.14% of the length of the roll, and the quality of the inner and outer surfaces of the steel pipe is significantly improved when the steel pipe is rolled 165×12 for model c45e+n (the content of phosphorus and sulfur in the steel pipe is more strict than that of model C45E), and +n represents that the material delivery state is normalized) according to the present invention, see table 2:
Table 2 c45e+n steel rolling effect table
| Comparison item | The invention is that | Traditional roller type |
| Depth of internal thread | 0.1～0.2mm | 0.4～0.6mm |
| Defects of inner and outer surfaces | 5.68％ | 13.32％ |
| Rolling current | 4385A | 4982A |
According to the law of minimum resistance, when metal is subjected to plastic deformation under the action of external force, each particle in the metal always flows along the direction with minimum resistance; meanwhile, the curve curvature or the straight line angle of each area of the roller shape is optimized, the metal flow instantaneous rate is slowed down, and the metal is fully flowed, so that the aim of improving the quality of the inner surface and the outer surface of the steel pipe is fulfilled, and the depth of the internal thread of the steel pipe produced by the roller is less than or equal to 0.2mm; meanwhile, the defects of the inner surface and the outer surface of the steel pipe are reduced by about 8 percent; the rolling deformation resistance is also reduced, and the rolling current is reduced by about 12%.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The roller shape for improving the surface quality of the Assel rolling mill rolled steel pipe is characterized in that an inlet cone area, a gradual change area and a rolling area are sequentially arranged from the inlet side to the outlet side of the roller;
the gradual change region comprises a first transition arc and a second transition arc, the first transition arc is tangent to the inlet cone region, and the second transition arc is tangent to the rolling region;
The inlet cone region comprises a first inlet partition and a second inlet partition, and the second inlet partition is connected with the first transition circular arc;
The included angle between the outer surface of the first inlet partition and the axis of the roller is alpha 1, the included angle between the surface of the second inlet partition and the axis of the roller is alpha 2, wherein alpha 2 is larger than alpha 1, and the difference between alpha 1 and alpha 2 is 1-2 degrees;
the angle of alpha 1 is 6.5-7 degrees;
The diameter D 1 of the first transition circular arc is 200mm-500mm, the diameter D 2 of the second transition circular arc is 200mm-500mm, and the diameter D 1 of the first transition circular arc is equal to the diameter D 2 of the second transition circular arc in length.
2. A roll profile for improving the quality of a rolled steel tube by a Assel mill according to claim 1, wherein the angle α 3 between the surface of the rolling zone and the roll axis is 3 ° to 5 °.
3. The roll shape for improving the surface quality of a Assel rolling mill rolled steel pipe according to claim 1, wherein the outlet circular pyramid area and the outlet cone area are sequentially arranged between the rolling area and the outlet side of the roll.
4. A roll shape for improving the surface quality of a rolled steel tube by a Assel rolling mill according to claim 1, wherein the center of the second transition arc is located on a straight line L 5, wherein the straight line L 5 is a straight line with an included angle of 4 ° with the straight line L 6, and the straight line L 6 is a straight line perpendicular to the axis of the roll at 20:27 in the length direction of the roll;
The intersection of L 5 and L 6 is located at the outer surface of the roll;
Closer to the exit side of the roll than L 5,L6.
5. A roll shape for improving the surface quality of a rolled steel tube by a Assel rolling mill according to claim 1, wherein the length of the first inlet partition along the axial direction of the roll is L 1,L1 which is 14% -20% of the total length of the roll.
6. A roll shape for improving the surface quality of a rolled steel tube by a Assel rolling mill according to claim 1, wherein the length of the rolling zone along the axial direction of the roll is L 3,L3 which is 12% -18% of the total length of the roll.
7. A roll shape for improving the quality of a rolled steel tube by a Assel mill according to claim 6, wherein the surface of the rolling zone is at an angle of 4 ° to the axis of the roll.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110937426.XA CN113634601B (en) | 2021-08-16 | 2021-08-16 | Roller shape for improving surface quality of Assel rolling mill rolled steel pipe |
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| CN202110937426.XA CN113634601B (en) | 2021-08-16 | 2021-08-16 | Roller shape for improving surface quality of Assel rolling mill rolled steel pipe |
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| CN113634601B true CN113634601B (en) | 2024-05-17 |
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2021
- 2021-08-16 CN CN202110937426.XA patent/CN113634601B/en active Active
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