CN111203444B - Core rod for producing thin-wall seamless pipe - Google Patents
Core rod for producing thin-wall seamless pipe Download PDFInfo
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- CN111203444B CN111203444B CN202010015291.7A CN202010015291A CN111203444B CN 111203444 B CN111203444 B CN 111203444B CN 202010015291 A CN202010015291 A CN 202010015291A CN 111203444 B CN111203444 B CN 111203444B
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 21
- 239000010959 steel Substances 0.000 abstract description 21
- 239000000463 material Substances 0.000 abstract description 9
- 238000005520 cutting process Methods 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 description 20
- 238000003466 welding Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005549 size reduction Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention provides a core rod for producing a thin-wall seamless pipe, which comprises a conical section, a working section and a supporting section, wherein the conical section is of a frustum structure, the working section and the supporting section are of a cylinder structure, the large end of the conical section is connected with one end of the working section, and the other end of the working section is connected with one end of the supporting section. The production of the thin-wall seamless pipe by using the core rod can obviously improve or even eliminate the flared flaring formed at the end part of the steel pipe, effectively improve the dimensional precision of the end part of the capillary, reduce the cutting length of the end part of the finished pipe and reduce the material loss.
Description
Technical Field
The invention relates to the field of steel pipe production, in particular to a core rod for producing a thin-wall seamless pipe.
Background
The rolling mill used in rolling mill for producing medium and thick wall seamless steel pipe such as carbon steel, low alloy steel, medium alloy steel and high alloy is Assel pipe mill of MEER Germany. Before rolling the steel pipe, a core rod is inserted into the inner hole of the perforated hollow billet so as to drive the hollow billet to be fed into a pipe mill and finish rolling deformation in the hole pattern of the pipe mill, and finally, the wall fixing process is finished. The core rod is used for driving the capillary tube to be fed into the tube mill and is matched with three rollers (the three rollers are arranged at 120 degrees) of the tube mill to surround the tube mill to form a hole pattern required by the fixed wall of the rolled tube.
Currently, a core rod for a rolled tube is a linear hollow rod (internally provided with internal water cooling) with various specifications of diameters (90 groups are included, phi 76 mm-phi 442 mm) and lengths of 19.75m (wherein the supporting section is 15.55m, the working section is 4m and the end conical section is 0.2 m). When a thin-wall (D/S is more than or equal to 16, D refers to the outer diameter value of a produced steel pipe and S refers to the wall thickness value) steel pipe is produced, the front end of a capillary is easy to produce a flared mouth at the end part after being rolled by a pipe mill, and the flared mouth part affects the biting of a subsequent reducing process because the outer diameter value of the flared mouth part is larger than the average value of the outer diameter of a pierced billet under normal conditions, so that extra adjustment time (about 10 seconds/branch) is increased, meanwhile, defects such as excessive size of the steel pipe and the like are caused, and even waste products are directly caused; in addition, the flared flaring part has a wall thickness reducing section (the average wall thickness is smaller than the normal average wall thickness value of the pierced billet after rolling), and the thin-wall pipe tolerance zone is smaller under the same tolerance requirement, so that when the wall thickness value of the wall thickness reducing section exceeds the lower tolerance limit, a head is required to be cut (the length of a normal steel pipe head is about 200-250 mm, and the length of the steel pipe head with the wall thickness reducing section is about 350-450 mm), thereby causing the material loss of a finished steel pipe.
The above problems can be solved by selectively changing Assel the pipe mill or redesigning the mandrel, the Assel pipe mill has a complex structure, belongs to the special technology of equipment suppliers, and does not have the capability of improving the technology. In contrast, redesigning the mandrel may be satisfactory for use, but there are mainly several limitations:
1) The original supporting section of the core rod cannot be directly welded to the modified working section of the core rod, if the step at the welded part is caused by direct welding, the quality of the inner surface of the rolled steel pipe is affected, the stability of the welded part is affected, and the strength is reduced;
2) Under the condition that other parameters are unchanged, the wall thickness of the whole steel pipe is changed due to the diameter change of the core rod;
3) When the capillary tube is rolled, the distance between the roller shoulder and the surface of the core rod is increased, so that the deformation of the end part of the capillary tube is reduced, and the flaring of the flare is improved or eliminated.
Through the analysis, the problem of solving the use problem of the core rod can be determined to be solved from the redesign of the core rod, so that the novel core rod which not only meets the technical requirement, but also can improve the flaring of the rolled end part in a horn shape is found to have very important significance in the rolling of the thin-wall pipe of the Assel pipe mill.
Disclosure of Invention
The invention aims to provide a mandrel for producing a thin-wall seamless pipe. The production of the thin-wall seamless pipe by using the core rod can obviously improve or even eliminate the flared flaring formed at the end part of the steel pipe, effectively improve the dimensional precision of the end part of the capillary, reduce the cutting length of the end part of the finished pipe and reduce the material loss.
In order to achieve the above object, the present invention provides the following technical solutions:
A plug for production of thin wall seamless tube, the plug includes toper section, working segment and support section, wherein, the toper section is the frustum structure, the working segment with the support section is the cylinder structure, the big end of toper section with the one end of working segment is connected, the other end of working segment with the one end of support section is connected.
Further, in the mandrel described above, the working section includes a thin section and a thick section, the outer diameter of the thin section is smaller than the outer diameter of the thick section, one end of the thin section is connected with the large end of the tapered section, the other end of the thin section is connected with one end of the thick section, and the other end of the thick section is connected with one end of the supporting section.
Further, in the core rod described above, the other end of the thin section is connected to one end of the thick section by a rounded corner, preferably, the radius R of the rounded corner is 80mm to 135mm, and preferably, the center of the rounded corner is located outside the core rod.
Further, in the above-described core rod, the outer diameter of the thick section is equal to the outer diameter D1 of the support section, and the outer diameter of the thin section is equal to the outer diameter D2 of the large end of the tapered section.
Further, in the above-described core rod, the outer diameter of the thin section is smaller than the outer diameter of the thick section by 1.5mm to 6mm.
Further, in the mandrel described above, the length L of the working section is 4000mm, the length L1 of the thick section is 2000mm to 2600mm, and the length L2 of the thin section is 4000mm to L1.
Further, in the mandrel, the ratio of the diameter of the small end of the conical section to the diameter of the large end of the conical section is more than or equal to 1:2.5, and the length L3 of the conical section is 200mm.
Further, in the core rod, a first annular groove is formed in the inner wall of one end of the thin section, a first annular protrusion is formed in the large end of the conical section, and the first annular protrusion can be inserted into the first annular groove;
The inner wall of thick section other end is provided with the second annular groove, the one end of supporting section is provided with the second annular bulge, the second annular bulge can insert in the second annular groove.
Further, in the mandrel bar described above, the length L4 of the support section is 14000mm to 16000mm.
Further, in the mandrel described above, the large end of the tapered section, the working section, and the interior of the supporting section are all provided with cavities, and the large end of the tapered section, the working section, and the cavities in the supporting section are sequentially communicated; preferably, the wall thickness of the cavity is 35-45 mm.
It is seen from the analysis that the present invention discloses a mandrel for the production of thin-walled seamless tubes, comprising a tapered section, a working section and a support section. The technical scheme of the invention adopts a 'two-section' structure, and only reduces the diameter of the core rod working section in a part of the area under the condition of not changing the appearance and the size of the welding part of the original core rod working section and the supporting section, so that the working section is divided into a thin section and a thick section, the outer diameter of the thin section is smaller than that of the thick section, and the original outer diameter size section (thick section) and the outer diameter size reduction section (thin section) of the working section are smoothly transited by adopting a machining mode. In the pipe jacking rolling process, as the outer diameter of the thin section close to the conical section is smaller than that of the thick section close to the supporting section, the distance between the roller shoulder and the surface of the thin section is increased, the rolling deformation of the end part of the hollow billet is reduced, the average wall thickness value of the wall thickness reducing section is increased, the flared flaring can be obviously improved by reducing the rolling deformation, the flared flaring can be even eliminated by part of specifications, the size precision of the end part of the hollow billet can be effectively improved by increasing the average wall thickness value of the wall thickness reducing section, the head cutting length of the end part of the finished pipe is reduced, and the material loss is reduced.
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 structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a working section according to an embodiment of the present invention.
Reference numerals illustrate: 1a conical section; 11 a first annular projection; 2, working sections; 21 fine segments; 22 a first annular groove; 23 thick sections; 24 a second annular groove; 3, a supporting section; 31 a second annular projection; 4, a cavity;
Radius of R fillet; d1 outer diameter of the support section; the outer diameter of the large end of the D2 conical section;
the length of the L working section; length of L1 thick section; length of L2 minutiae; the length of the L3 tapered section; l4 supports the length of the segment.
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.
As shown in fig. 1 and 2, according to an embodiment of the present invention, there is provided a mandrel for producing a thin-walled seamless tube, the mandrel including a tapered section 1, a working section 2 and a supporting section 3, wherein the tapered section 1 is of a frustum or cone structure, the working section 2 and the supporting section 3 are both of a cylindrical structure, a large end of the tapered section 1 is connected with one end of the working section 2, and the other end of the working section 2 is connected with one end of the supporting section 3. The conical section 1 is used for pipe jacking necking, and the working section 2 and the supporting section 3 are used for pipe jacking rolling.
Further, the working section 2 is an integral mechanism, the working section 2 comprises a thin section 21 and a thick section 23, the outer diameter of the thin section 21 is smaller than that of the thick section 23, one end of the thin section 21 is connected with the large end of the conical section 1, the other end of the thin section 21 is connected with one end of the thick section 23, and the other end of the thick section 23 is connected with one end of the supporting section 3. The outer diameter of the thick section 23 is equal to the outer diameter D1 of the support section 3 and the outer diameter of the thin section 21 is equal to the outer diameter D2 of the large end of the conical section 1. In the pipe jacking rolling process, as the outer diameter of the thin section 21 close to the conical section 1 is smaller than the outer diameter of the thick section 23 close to the supporting section 3, the distance between the roller shoulder and the surface of the thin section 21 is increased, so that the rolling deformation of the end part of the hollow billet is reduced, the average wall thickness value of the wall thickness reducing section is increased, the flare-shaped flaring can be obviously improved by reducing the rolling deformation, the flare-shaped flaring can be even eliminated by part of specifications, the dimensional precision of the end part of the hollow billet can be effectively improved by increasing the average wall thickness value of the wall thickness reducing section, the cutting length of the end part of the finished pipe is reduced, and the material loss is reduced.
Further, the other end of the thin section 21 is connected with one end of the thick section 23 through a round corner, so that the joint of the thin section 21 and the thick section 23 can be smoothly transited through the round corner, and the inner surface of the steel pipe is prevented from being scratched by burrs formed in the step formation or rolling process of the part. Preferably, the radius R of the rounded corners is 80mm to 135mm (such as 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130 mm), preferably 100mm; the other end of the thin section 21 and one end of the thick section 23 form a rounded transition through the circular arc of a rounded corner, preferably with the center of the rounded corner on the outside of the core rod.
Further, the outer diameter of the thin section 21 is 1.5mm to 6mm smaller than the outer diameter of the thick section 23 (e.g., 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5 mm). The difference between the outer diameters of the thin section 21 and the thick section 23 is properly adjusted according to the specifications of the produced thin-walled tube, and if the difference between the outer diameters of the thin section 21 and the thick section 23 is too small, the flared mouth of the capillary end can not be improved, and if the difference between the outer diameters of the thin section 21 and the thick section 23 is too large, the dimensional accuracy of the capillary end can be affected. Preferably, the outer diameter of the thin section 21 is smaller than the outer diameter of the thick section 23 by 4mm, so that the flared mouth of the capillary end can be improved, and the dimensional accuracy of the capillary end is not affected.
Further, the length L of the working section 2 is 4000mm, the lengths of the thin section 21 and the thick section 23 are properly adjusted according to the specifications of the thin-walled pipe to be produced, the length L1 of the thick section 23 is 2000 mm-2600 mm (for example: 2050mm, 2100mm, 2150mm, 2200mm, 2250mm, 2300mm, 2350mm, 2400mm, 2450mm, 2500mm, 2550 mm), and the length L2 of the thin section 21 is 4000mm-L1. Too small a length of the thin section 21 cannot improve the flared flaring of the tubular billet end, and too large a length of the thin section 21 can cause the wall thickness of the steel pipe in the outer region of the end to be too large, so that the overall dimensional accuracy of the tubular billet is affected.
Further, as shown in fig. 2, the inner wall of one end of the thin section 21 is provided with a first annular groove 22, the large end of the conical section 1 is provided with a first annular protrusion 11, the first annular protrusion 11 can be inserted into the first annular groove 22, and the first annular protrusion 11 and the first annular groove 22 are in welding connection, namely, the working section 2 and the conical section 1 are in welding connection; the inner wall at the other end of the thick section 23 is provided with a second annular groove 24, one end of the supporting section 3 is provided with a second annular bulge 31, the second annular bulge 31 can be inserted into the second annular groove 24, and the second annular bulge 31 and the second annular groove 24 are in welded connection, namely, the working section 2 and the supporting section 3 are in welded connection. The welded connection can fasten the connection between the working section 2 and the conical section 1 and the connection between the working section 2 and the supporting section 3, and the dimensional accuracy of the capillary end is improved.
Further, the ratio of the diameter of the small end of the conical section 1 to the diameter of the large end of the conical section 1 is more than or equal to 1:2.5, the conical section 1 can be made into a bullet-shaped cone, and the length L3 of the conical section 1 is 200mm.
Further, the length L4 of the support section 3 is 14000mm to 16000mm (for example ：14100mm、14200mm、14300mm、14400mm、14500mm、14600mm、14700mm、14800mm、14900mm、15000mm、15100mm、15200mm、15300mm、15400mm、15500mm、15600mm、15700mm、15800mm、15900mm).
Further, the large end of the conical section 1, the working section 2 and the inside of the supporting section 3 are all provided with cavities 4, and the large end of the conical section 1, the working section 2 and the cavities 4 inside the supporting section 3 are sequentially communicated. During the pipe jacking rolling process, the cavity 4 is used for water cooling. Preferably, the wall thickness of the cavity 4 is 35-45 mm, which provides sufficient strength while the space of the cavity 4 is sufficient for water cooling.
In one embodiment of the invention:
the radius R of the round angle is 100mm;
the outer diameter of the thin section 21 is 4mm smaller than that of the thick section 23, namely, the outer diameter D1 of the supporting section is 4mm, namely, the outer diameter D2 of the large end of the conical section;
The length L of the working section is 4000mm; the length L1 of the thick section is 2200mm; the length L2 of the thin section is 1800mm; the length L3 of the conical section is 200mm; the length L4 of the support section is 15500mm.
And determining the parameters of the core rod by matching with the throat diameter value, rolling speed and the like of the pipe mill of Assel pipe mill equipment.
The technical scheme of the invention is used for rolling the thin-wall pipe (D/S is more than or equal to 16) of Assel pipe mill. The production amount of the thin-wall pipe (D/S is more than or equal to 16) is 4 ten thousand tons per year, the weight of a single steel pipe is 2.3 tons, the adjustment time is additionally increased by 10 seconds per minute, 40000/2.3X10/60= 2898.5 minutes can be produced all the year round, 33 branches can be produced every hour according to reality, 2898.5/60×33×2.3= 3666.6 tons per year can be produced all the time, the average profit is 700 yuan per ton according to the sales of the steel pipe, and the income is increased by 3666.6 ×700= 255.787 ten thousand yuan per year. Value of steel pipe reduction material loss: according to the steel pipe cost, the average price is 6500 yuan/ton, the length of each steel pipe is reduced by 0.15m, the length of each steel pipe is reduced by 10m, the material loss is reduced by 40000/2.3) × (2.3/10×0.15) =600 tons, the material loss cost is reduced by 6500×600=390 ten thousands/year, and the annual effect is 255.787+390= 645.787 ten thousands yuan/year. The yield of the thin-wall pipe (D/S is more than or equal to 16) is improved by 0.2 percent.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
A mandrel for the production of thin-walled seamless tubes comprises a conical section 1, a working section 2 and a support section 3. According to the technical scheme, a two-section structure is adopted, the diameter of the core rod working section in a part of the area is reduced under the condition that the appearance and the size of the welding part of the original core rod working section and the supporting section are not changed, the working section 2 is divided into a thin section 21 and a thick section 23, the outer diameter of the thin section 21 is smaller than that of the thick section 23, and the original outer diameter size section (thick section 23) and the outer diameter size reduction section (thin section 21) of the working section 2 are smoothly transited in a machining mode. In the pipe jacking rolling process, as the outer diameter of the thin section 21 close to the conical section 1 is smaller than the outer diameter of the thick section 23 close to the supporting section 3, the distance between the roller shoulder and the surface of the thin section 21 is increased, so that the rolling deformation of the end part of the hollow billet is reduced, the average wall thickness value of the wall thickness reducing section is increased, the flare-shaped flaring can be obviously improved by reducing the rolling deformation, the flare-shaped flaring can be even eliminated by part of specifications, the dimensional precision of the end part of the hollow billet can be effectively improved by increasing the average wall thickness value of the wall thickness reducing section, the cutting length of the end part of the finished pipe is reduced, and the material loss is reduced.
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 (8)
1. A mandrel for the production of thin-walled seamless tubes, characterized in that the mandrel comprises a conical section, a working section and a support section, wherein,
The conical section is of a frustum structure, the working section and the supporting section are of a cylinder structure,
The large end of the conical section is connected with one end of the working section, the other end of the working section is connected with one end of the supporting section,
The working section comprises a thin section and a thick section, the outer diameter of the thin section is smaller than that of the thick section, one end of the thin section is connected with the large end of the conical section, the other end of the thin section is connected with one end of the thick section, the other end of the thick section is connected with one end of the supporting section,
The outer diameter of the thin section is 1.5 mm-6 mm smaller than that of the thick section,
The outer diameter of the thick section is equal to the outer diameter D1 of the supporting section, the outer diameter of the thin section is equal to the outer diameter D2 of the large end of the conical section,
The inner wall of one end of the thin section is provided with a first annular groove, the large end of the conical section is provided with a first annular bulge, and the first annular bulge can be inserted into the first annular groove;
The inner wall of thick section other end is provided with the second annular groove, the one end of supporting section is provided with the second annular bulge, the second annular bulge can insert in the second annular groove.
2. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The other end of the thin section is connected with one end of the thick section through a round angle.
3. The mandrel of claim 2, wherein the mandrel is,
The radius R of the round angle is 80 mm-135 mm,
The center of the round angle is arranged on the outer side of the core rod.
4. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The length L of the working section is 4000mm, the length L1 of the thick section is 2000 mm-2600 mm, and the length L2 of the thin section is 4000mm-L1.
5. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The ratio range of the diameter of the small end of the conical section to the diameter of the large end of the conical section is more than or equal to 1:2.5, and the length L3 of the conical section is 200mm.
6. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The length L4 of the supporting section is 14000 mm-16000 mm.
7. The mandrel of any of claims 1-6, wherein,
The big end of the conical section, the working section and the inside of the supporting section are all provided with cavities, and the big end of the conical section, the working section and the inside cavities of the supporting section are communicated in sequence.
8. The mandrel of claim 7, wherein the cavity has a wall thickness of 35-45 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015291.7A CN111203444B (en) | 2020-01-07 | 2020-01-07 | Core rod for producing thin-wall seamless pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015291.7A CN111203444B (en) | 2020-01-07 | 2020-01-07 | Core rod for producing thin-wall seamless pipe |
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| Publication Number | Publication Date |
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| CN111203444A CN111203444A (en) | 2020-05-29 |
| CN111203444B true CN111203444B (en) | 2024-05-07 |
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| CN111203444A (en) | 2020-05-29 |
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