CN115591943A - Steel pipe cold rolling mill core bar and steel pipe cold rolling mill - Google Patents
Steel pipe cold rolling mill core bar and steel pipe cold rolling mill Download PDFInfo
- Publication number
- CN115591943A CN115591943A CN202211282628.6A CN202211282628A CN115591943A CN 115591943 A CN115591943 A CN 115591943A CN 202211282628 A CN202211282628 A CN 202211282628A CN 115591943 A CN115591943 A CN 115591943A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- rolling mill
- cold rolling
- core bar
- pipe cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000005097 cold rolling Methods 0.000 title claims abstract description 39
- 230000001681 protective effect Effects 0.000 claims abstract description 42
- 241000282461 Canis lupus Species 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 239000010960 cold rolled steel Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 235000009421 Myristica fragrans Nutrition 0.000 description 3
- 239000001115 mace Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000037390 scarring Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention belongs to the field of steel pipe cold rolling, and particularly relates to a steel pipe cold rolling mill core bar and a steel pipe cold rolling mill, which can prevent the core bar from contacting with the inner surface of a steel pipe to be rolled to form scratches, and the technical scheme is as follows: the steel pipe cold rolling mill core bar include set up in the wolf tooth stick at middle part, wolf tooth stick both ends respectively be fixed with at least one protective sheath on the core bar, the external diameter of protective sheath is greater than the biggest external diameter of core bar, just the surface hardness of protective sheath is less than the surface hardness of the product of steel pipe cold rolling mill processing.
Description
Technical Field
The invention belongs to the field of steel pipe cold rolling, and particularly relates to a steel pipe cold rolling mill core bar and a steel pipe cold rolling mill.
Background
In the technical development process of the cold-rolled steel pipe, the surface defects of the inner wall of the cold-rolled pipe are more and more obvious in scratching (scarring). According to the equipment condition, the main feeding mode of the stainless steel pipe cold rolling mill designed in China at present is to feed from the outside of a rotary feeding box of the equipment. In the cold rolling and feeding process, a to-be-rolled steel pipe enters the middle of equipment from the outside of the equipment, the to-be-rolled steel pipe needs to run for a distance of more than 8m, a fixed core rod is sleeved inside the steel pipe in the running process, the core rod is made of C45 steel, and an equipment sleeve and a stable steel pipe sleeve exist outside the steel pipe.
The core rod may be pressed on a moving steel pipe to be rolled due to self weight, so that mutual friction exists between the steel pipe to be rolled and the core rod, the surface of the core rod is easily scratched seriously due to repeated use of the core rod, the scratch on the surface of the core rod can scratch the inner surface of the steel pipe to be rolled, the smoothness is reduced, and the user requirements cannot be met.
The inner wall of the steel rolling pipe is easy to be subjected to polishing ash and sawing steel pins, and the inner wall of the steel rolling pipe and the core rod are easy to be scratched in the feeding process.
The bending of the core rod causes the change of the positions of the core rod connecting the core rod and the hole patterns, the more difficult the metal flows in the cold rolling deformation process, the more uneven the cold rolling deformation, the change of the outer diameter wall thickness dimension, and the change of the hole pattern positions of the core rod causes the easy steel sticking of the core rod, thereby causing the rolling damage defect.
The impact force can be formed on the core rod by a rolling mill during normal rolling, the core rod is easy to bend and break after long-time production, the bending of the core rod causes the position of a core rod and a hole pattern connected with the core rod to change, the more difficult the metal flows in the cold rolling deformation process, the more uneven the cold rolling deformation, the change of the outer diameter wall thickness is caused, and the change of the hole pattern position of the core rod causes the core rod to be easy to stick steel, thereby causing the roll damage defect.
Disclosure of Invention
In order to overcome the defects in the related technology, the invention provides a steel tube cold rolling mill core bar and a steel tube cold rolling mill, which can prevent the core bar from contacting with the inner surface of a steel tube to be rolled to form scratches.
In order to achieve the technical purpose, the invention provides a steel tube cold rolling mill core bar on one hand. The steel pipe cold rolling mill core bar include set up in the wolf tooth stick at middle part, wolf tooth stick both ends respectively be fixed with at least one protective sheath on the core bar, the external diameter of protective sheath is greater than the biggest external diameter of core bar, just the surface hardness of protective sheath is less than the surface hardness of the product of steel pipe cold rolling mill processing.
Preferably, the core rods at two ends of the wolf tooth bar are respectively provided with at least one annular groove, and a protective sleeve is sleeved outside each annular groove.
Preferably, the difference between the outer diameter of the protective sleeve and the diameter of the core rod except for the wolf tooth rod part ranges from 3mm to 10mm.
Preferably, the length of the protective sleeve is 300mm to 400mm.
Preferably, the depth of the annular groove is 8mm to 12mm.
Preferably, the protective sheath comprises a polyamide material.
Preferably, the protective sleeve and the core rod are fixed by a screw perpendicular to the direction of the core rod.
On the other hand, some embodiments of the invention also provide a steel tube cold rolling mill, which comprises the steel tube cold rolling mill core bar of any one of the embodiments.
The invention has the beneficial effects that:
the steel pipe to be rolled rubs the protective sleeve in the moving process, and the steel pipe does not directly rub the core rod, so that the friction between steel and steel can be avoided, and the inner surface of the steel pipe to be rolled can be protected on the premise that the hardness of the protective sleeve is less than that of the steel pipe to be rolled.
The annular groove is formed in the core rod, so that the core rod is easier to break rather than bend after being impacted, the condition that the core rod is not known to bend is avoided, and the rolling defect caused by the fact that the position of the core rod is changed to cause the core rod to be stuck with steel is avoided.
The diameter of the protective sleeve is larger than that of the core rod, so that a part of steel pins on the inner wall of the pipe to be rolled can be removed through polishing, and rolling defects caused by the fact that the steel pins and the polishing enter a deformation interval along with the pipe to be rolled are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings used in the description of the embodiments or the related art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a cross-sectional view of a protective casing of the present invention;
FIG. 3 is a core pin construction view of the present invention with an annular groove.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In one aspect, the invention provides a steel tube cold rolling mill core bar. As shown in fig. 1 to fig. 3, the steel pipe cold rolling mill core bar 1 includes a wolf tooth bar 11 disposed in the middle, at least one protective sleeve 3 is fixed on each of the core bar 1 at two ends of the wolf tooth bar 11, the outer diameter of the protective sleeve 3 is greater than the maximum outer diameter of the core bar 1, and the surface hardness of the protective sleeve 3 is less than the surface hardness of the product processed by the steel pipe cold rolling mill.
For example, a protective sleeve 3 is fixed on the core rod 1 at two ends of the mace 11, the outer diameter of the protective sleeve 3 is larger than the maximum outer diameter of the core rod 1, and the protective sleeve 3 should be smaller than the inner diameter of the pipe to be rolled, so that the pipe to be rolled is sleeved on the core rod 1. The nearest distance between the protective sleeve 3 and the wolf tooth stick 11 can be 300mm to 500mm, for example, 300mm, 400mm or 500mm. The distance between two adjacent protective sleeves 3 can be 300mm to 500mm, for example, 300mm, 400mm or 500mm.
Preferably, the difference between the outer diameter of the protective sleeve 3 and the diameter of the core rod 1 except for the wolf tooth rod 11 is in the range of 3mm to 10mm. For example, the protective sheath 3 has an outer diameter which is 3mm, 6mm or 10mm larger than the diameter of the core rod 1 except for the part of the mace 11.
Preferably, the core rod 1 at both ends of the mace 11 is provided with at least one annular groove 4, and each annular groove 4 is sleeved with a protective sleeve 3.
Preferably, the length of the protective sleeve 3 is 300mm to 400mm.
Preferably, the depth of the annular groove 4 is 8mm to 12mm.
For example, each annular groove 4 may have a protective sleeve 3 fixed therein, and the length of the protective sleeve 3 may be 300mm, 350mm or 400mm, and it is understood that the length of the annular groove 4 in the axial direction of the mandrel 1 may be 300mm, 350mm or 400mm, that is, the annular groove 4 corresponds to the length of the protective sleeve 3 disposed therein. The depth of the annular groove 4 is 8mm, 10mm or 12mm.
Preferably, the protective sheath 3 comprises a polyamide material. Of course, other materials having a hardness of less than 200HB may be used for the purposes of this application, such as copper.
Preferably, the protective sleeve 3 is fixed with the core bar 1 through a screw perpendicular to the direction of the core bar 1. It will be appreciated that, in order to prevent the screw from possibly scratching the inner surface of the steel pipe to be rolled, the screw may be a countersunk screw.
In addition, it will be appreciated that, in order to facilitate the fitting of the protective sheath 3 on the annular groove 4, the protective sheath 3 may be provided with two or more arcuate pieces which contact the tube to be rolled and prevent the core rod 1 from coming into direct contact with the tube to be rolled.
On the other hand, some embodiments of the invention also provide a steel tube cold rolling mill, which comprises the steel tube cold rolling mill core bar of any one of the embodiments.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a steel pipe cold rolling mill core bar, its characterized in that, the core bar is including setting up the wolf teeth stick in the middle part, the wolf teeth stick both ends respectively be fixed with at least one protective sheath on the core bar, the external diameter of protective sheath is greater than the biggest external diameter of core bar, just the surface hardness of protective sheath is less than the surface hardness of the product of steel pipe cold rolling mill processing.
2. The steel pipe cold rolling mill core bar according to claim 1, wherein the core bar at both ends of the wolf tooth bar is respectively provided with at least one annular groove, and a protective sleeve is sleeved outside each annular groove.
3. The steel pipe cold rolling mill core rod according to claim 2, wherein the difference between the outer diameter of the protective sheath and the diameter of the core rod excluding the wolf tooth rod portion ranges from 3mm to 10mm.
4. The steel pipe cold rolling mill core bar according to claim 3, wherein the length of the protective sleeve is 300mm to 400mm.
5. The steel tube cold rolling mill core rod of claim 4, wherein the depth of the annular groove is 8mm to 12mm.
6. The cold-rolled steel pipe core bar of claim 5, wherein the protective jacket comprises a polyamide material.
7. The steel pipe cold rolling mill core bar of claim 6, wherein the protective sheath and the core bar are fixed by a screw perpendicular to the direction of the core bar.
8. A cold-rolling mill for steel pipes, characterized by comprising the cold-rolling mill core bar of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211282628.6A CN115591943A (en) | 2022-10-19 | 2022-10-19 | Steel pipe cold rolling mill core bar and steel pipe cold rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211282628.6A CN115591943A (en) | 2022-10-19 | 2022-10-19 | Steel pipe cold rolling mill core bar and steel pipe cold rolling mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115591943A true CN115591943A (en) | 2023-01-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211282628.6A Pending CN115591943A (en) | 2022-10-19 | 2022-10-19 | Steel pipe cold rolling mill core bar and steel pipe cold rolling mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115591943A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001293502A (en) * | 2000-04-13 | 2001-10-23 | Sumitomo Metal Ind Ltd | Method for controlling rolling of seamless tube and rolling device |
| CN204685660U (en) * | 2015-05-29 | 2015-10-07 | 杭州立达管业有限公司 | Steel Pipe Cold plug |
| CN206139642U (en) * | 2016-08-31 | 2017-05-03 | 上海众山特殊钢有限公司 | Rolling mill plug |
| CN206382328U (en) * | 2017-01-03 | 2017-08-08 | 山东昊林铜业有限公司 | Mandrel bar |
| CN210859603U (en) * | 2019-11-22 | 2020-06-26 | 河北标光阀门制造有限公司 | Overload-proof protective sleeve |
| CN112222191A (en) * | 2020-09-19 | 2021-01-15 | 太原科技大学 | Six-roller cold rolling mill for difficult-to-deform metal seamless pipe |
-
2022
- 2022-10-19 CN CN202211282628.6A patent/CN115591943A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001293502A (en) * | 2000-04-13 | 2001-10-23 | Sumitomo Metal Ind Ltd | Method for controlling rolling of seamless tube and rolling device |
| CN204685660U (en) * | 2015-05-29 | 2015-10-07 | 杭州立达管业有限公司 | Steel Pipe Cold plug |
| CN206139642U (en) * | 2016-08-31 | 2017-05-03 | 上海众山特殊钢有限公司 | Rolling mill plug |
| CN206382328U (en) * | 2017-01-03 | 2017-08-08 | 山东昊林铜业有限公司 | Mandrel bar |
| CN210859603U (en) * | 2019-11-22 | 2020-06-26 | 河北标光阀门制造有限公司 | Overload-proof protective sleeve |
| CN112222191A (en) * | 2020-09-19 | 2021-01-15 | 太原科技大学 | Six-roller cold rolling mill for difficult-to-deform metal seamless pipe |
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