CN111151579B - End cone shaped core rod - Google Patents
End cone shaped core rod Download PDFInfo
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- CN111151579B CN111151579B CN202010075768.0A CN202010075768A CN111151579B CN 111151579 B CN111151579 B CN 111151579B CN 202010075768 A CN202010075768 A CN 202010075768A CN 111151579 B CN111151579 B CN 111151579B
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- core rod
- mandrel
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- 229910000831 Steel Inorganic materials 0.000 abstract description 42
- 239000010959 steel Substances 0.000 abstract description 42
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 238000005520 cutting process Methods 0.000 abstract description 16
- 230000008719 thickening Effects 0.000 abstract description 7
- 238000005096 rolling process Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 238000004513 sizing Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention provides a tapered end part core rod, which comprises a core rod main body and core rod heads, wherein one core rod head is arranged at two ends of the core rod main body, the two core rod heads are arranged in a mirror image mode, the outer diameter of the core rod main body is larger than that of the core rod head, the core rod head consists of a first conical table section and a cylindrical section, the large end of the first conical table section is connected with one end of the cylindrical section, and the other end of the cylindrical section is connected with the core rod main body through a step; the step is a second conical section, the large end of the second conical section is connected with the other end of the cylindrical section, and the small end of the second conical section is connected with the core rod main body. The invention can effectively solve the problem of thickening of the end part of the reduced steel pipe, thereby achieving the aim that the steel pipe has no thickened end after production, reducing the cutting head of the steel pipe and improving the yield.
Description
Technical Field
The invention relates to the field of manufacturing of special steel equipment, in particular to a mandrel with a conical end part.
Background
In the production of hot rolled seamless steel pipes, the production process can be summarized into six processes: a billet production process, a heating process, a perforating process, a rolled tube extending process, a diameter fixing (reducing) process and a finishing process, wherein three basic deformation processes are as follows: perforating, namely perforating a solid tube blank into a hollow blank tube; rolling the pipe, namely rolling the hollow Mao Guanpi with a certain wall thickness to obtain a pierced billet with the outer diameter and the wall thickness of the finished pipe; and (3) sizing and reducing (including tension reducing and micro tension reducing), and rolling the steel pipe into a finished pipe with qualified outer diameter and wall thickness dimensional precision and performance under the conditions of certain total reducing rate and reasonable single frame reducing rate.
Reducing is the last plastic forming process in the production of hot rolled seamless steel pipes, and in the tension reducing process, the steel pipes are reduced into finished pipes with various calibers through continuous rolling of several or more than ten frames. Tension rolling phenomenon exists in a sizing mill and a tension reducing mill in the original production process, and the condition that the length of a thickened section of the end part of a pipe is longer during tension rolling can influence the yield of products.
Reducing is the last plastic forming process in the production of hot rolled seamless steel pipes, and in the tension reducing process, the steel pipes are reduced into finished pipes with various calibers through continuous rolling of several or more than ten frames. Therefore, the length of the thickened section at the head end and the tail end of the steel pipe in production is overlong, the cutting loss is overlarge, the average cutting loss of the production of the hot rolled seamless steel pipe by utilizing the core rod in the prior art is 10.5%, and the yield is low.
Therefore, in order to reduce the length of the cutting head and improve the yield, a novel mandrel for the jacking pipe process is needed.
Disclosure of Invention
The invention aims to provide a mandrel with a conical end. The head of the core rod is conical, the wall thickness of the head of the pipe is 1 meter thinner than that of other positions after the pipe is jacked, the purpose that the wall thickness of the head is thickened and the wall thickness of the head is offset is achieved after the pipe passes through a reducing mill, and therefore the whole wall thickness of the pipe is equal after the pipe is reduced. The invention can effectively solve the problem of thickening of the end part of the reduced steel pipe, thereby achieving the aim that the steel pipe has no thickened end after production, reducing the cutting head of the steel pipe and improving the yield.
In order to achieve the above object, the present invention provides the following technical solutions:
The end-conical core rod comprises a core rod main body and core rod heads, wherein one core rod head is arranged at two ends of the core rod main body, the two core rod heads are arranged in a mirror image mode, the outer diameter of the core rod main body is larger than that of the core rod head, the core rod head consists of a first conical section and a cylindrical section, the large end of the first conical section is connected with one end of the cylindrical section, and the other end of the cylindrical section is connected with the core rod main body through a step; the step is a second conical section, the large end of the second conical section is connected with the other end of the cylindrical section, and the small end of the second conical section is connected with the core rod main body.
Further, in the mandrel described above, the junction of the first cone section and the cylindrical section is connected by a first rounded corner; preferably, the radius R1 of the first rounded corner is 30mm.
Further, in the mandrel described above, the large end of the second tapered section is connected to the other end of the cylindrical section through a second rounded corner.
Further, in the core rod, the center of the second round angle is located in the core rod; the radius of the second round angle is 14mm; preferably, a third round angle is further included between the second conical section and the cylindrical section, the second conical section, the second round angle, the third round angle and the cylindrical section are sequentially arranged, the circle center of the third round angle is located outside the core rod, and the radius of the third round angle is 2.5mm.
Further, in the mandrel described above, the outer diameter of the small end of the second taper section is identical to the outer diameter D of the mandrel main body, and the outer diameter D3 of the large end of the second taper section is 0.4mm to 0.6mm larger than the outer diameter of the small end of the second taper section.
Further, in the mandrel described above, the vertical distance L7 between the large end of the second frustum section and the small end of the second frustum section is 800mm-1200mm; preferably, a vertical distance L7 between the large end of the second frustum section and the small end of the second frustum section is 1000mm.
Further, in the above-described mandrel, the outer diameter D of the mandrel main body is 16mm larger than the outer diameter D1 of the cylindrical section, and the outer diameter of the large end of the first tapered section coincides with the outer diameter D1 of the cylindrical section.
Further, in the mandrel described above, the length of the first taper section is L1, and the length of the cylindrical section is L2, l1:l2=1 (2-4).
Further, in the core rod described above, the length L3 of the second rounded corner is 12mm; the length L4 of the third round angle is 2mm.
Further, in the above-described core rod, the surface hardness of the core rod is: HRC 45-50.
The analysis shows that the end conical core rod disclosed by the invention is larger than the rod head used in the prior art in a conical shape, the wall thickness of the head of the steel pipe after jacking is 1 meter thinner than that of other positions, and the purpose that the wall thickness of the head is thickened and the wall thickness of the head is offset by thinner is achieved after passing through a reducing mill, so that the whole wall thickness of the steel pipe after reducing is equivalent. The invention can effectively solve the problem of thickening of the end part of the reduced steel pipe, thereby achieving the aim that the steel pipe has no thickened end after production, reducing the cutting head of the steel pipe and improving the yield.
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 view of a prior art mandrel.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is an enlarged schematic view at C of fig. 2.
Fig. 4 is a schematic structural view of the second frustum section.
Reference numerals illustrate: 1a mandrel body; 2, the head of the core rod; 21a first frustum section; 22 cylindrical sections; 3 steps; 31 a second frustum section; 4, a first round angle; 5 second round corners; 6, third round corners; 7 grooves;
d the outer diameter of the core rod main body; d1 outer diameter of cylindrical section; d2 outer diameter of the small end of the first cone section; d3 outer diameter of the large end of the second cone section;
The total length of the L core rod; the length of the L1 first cone section; the length of the L2 cylindrical section; the length of the L3 second rounded corner; the length of the L4 third rounded corner; the height of the L5 second round angle; the height of the third round angle L6; the vertical distance between the large end of the L7 second conical section and the small end of the second conical section;
Radius of the first rounded corner of R1; radius of R2 second fillet; radius of the third rounded corner R3.
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; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
Fig. 1 shows an original mandrel used in a jacking process in the prior art, the original mandrel including a mandrel body and a mandrel head, the mandrel body being a cylinder, the mandrel body being connected to the mandrel head, the connection between the mandrel body and the mandrel head being a corner. Because tension rolling phenomena exist in sizing mill units and stretch reducing mill units in the sizing and reducing production process, after sizing and reducing processes are completed, the length of a thickened section of the end part of the pierced billet is too long and cutting loss is too large due to tension rolling of the pierced billet. In the prior art, the average cutting loss of the pipe is 10.5%, and the yield is low.
As shown in fig. 2, according to an embodiment of the present invention, there is provided a mandrel with a tapered end, which is a modified mandrel obtained by modifying an original mandrel. The modified core rod comprises a core rod main body 1 and core rod heads 2, wherein one core rod head 2 is arranged at two ends of the core rod main body 1, the two core rod heads 2 are arranged in a mirror image mode, the outer diameter of the core rod main body 1 is larger than that of the core rod head 2, the core rod head 2 consists of a first cone section 21 and a cylindrical section 22, the large end of the first cone section 21 is connected with one end of the cylindrical section 22, and the other end of the cylindrical section 22 is connected with the core rod main body 1 through a step 3. The step 3 is a second conical section 31, the large end of the second conical section is connected with the other end of the cylindrical section 22, the small end of the second conical section is connected with the mandrel main body 1, the mandrel main body 1 and the step 3 are used for jacking pipe rolling, and the mandrel head 2 is used for jacking pipe necking.
Due to the arrangement of the step 3, the head 2+ step 3 of the modified mandrel used by the invention is increased in a conical shape compared with the head of the original mandrel, the wall thickness of the head of the steel pipe after pipe jacking rolling is thinner than that of other positions, and after the steel pipe passes through a reducing mill, the thickening of the wall thickness of the head and the thinner wall thickness of the head are counteracted, so that the whole wall thickness of the steel pipe after reducing is equivalent, the length of the thickened section at the head end and the tail end of the steel pipe is greatly reduced, the cutting loss is reduced, the average cutting loss of the hot rolled seamless steel pipe produced by using the modified mandrel is 7.74%, and the yield is greatly improved.
Further, as shown in fig. 2, the connection part of the first cone section 21 and the cylindrical section 22 is connected through a first round angle 4; preferably, the radius R1 of the first rounded corner 4 is 30mm, and the center of the first rounded corner 4 is inside the mandrel. In the vertical section, the first frustum section 21 is an isosceles trapezoid, and an included angle alpha between the waist and the upper bottom of the isosceles trapezoid is 135 degrees. As shown in fig. 1, the head of the original core rod is provided with a groove 7, the groove 7 of the original core rod is used for pushing the core rod in a matched manner by a push rod connected with the equipment body, the head of the push rod can wrap the head of the core rod, and the modified core rod of the application can be free of the groove.
Further, the length of the first cone segment 21 is L1, the length of the cylindrical segment 22 is L2, and l1:l2=1:2-4, so as to avoid the sliding rod caused by the loosening during the necking.
Further, the step 3 is a second conical section 31, the small end of the second conical section 31 is connected with the mandrel main body 1, and the large end of the second conical section 31 is connected with the cylindrical section 22 through the second round angle 5.
Preferably, a third round corner 6 is further included between the second conical section 31 and the cylindrical section 22, and the second conical section 31, the second round corner 5, the third round corner 6 and the cylindrical section 22 are sequentially arranged. Before pipe jacking rolling, the steel pipe needs to be subjected to necking, and the second round corners 5 and the third round corners 6 can prevent the steel pipe from sliding out during necking.
As shown in fig. 3, the center of the second round corner 5 is located inside the core rod, and the center of the third round corner 6 is located outside the core rod; preferably, the radius R2 of the second rounded corner 5 is 12mm-16mm, preferably 14mm, and the radius R3 of the third rounded corner 6 is 2mm-3mm, preferably 2.5mm, and the above arrangement of the second rounded corner 5 and the third rounded corner 6 is for better compacting the steel pipe and the core rod during necking, so as to avoid the occurrence of the case of shrinking.
The length L3 of the second rounded corner 5 may be 12mm and the height L5 of the second rounded corner 5 may be 6mm; the length L4 of the third round corner 6 can be 2mm, the height L6 of the third round corner 6 can be 2mm, the radian can be increased through the arrangement, and the steel pipe and the core rod can be locked at the necking.
Further, as shown in fig. 4, the diameter of the large end of the second taper section 31 is smoothly changed from large to small to the diameter of the small end of the second taper section 31, the outer diameter of the small end of the second taper section 31 is identical to the outer diameter D of the mandrel main body 1, and the outer diameter D3 of the large end of the second taper section 31 is 0.4mm to 0.6mm larger than the outer diameter of the small end of the second taper section 31. According to the wall increasing condition after reducing in production, the difference value is set to be 0.4mm-0.6mm, so that the wall increasing (the wall thickness increasing) caused by reducing can be counteracted, and the length of the head thickening part is reduced. As shown in fig. 4, only for expressing a smooth transition from large to small diameter at the step (second taper section 31), the size thereof does not represent the actual size. The wall thickness of the head of the steel pipe behind the jacking pipe can be ensured to be thinner than the wall thickness of other positions by the arrangement, and after the steel pipe passes through the reducing mill, the thickening of the wall thickness of the head and the deviation thinning of the wall thickness of the head are counteracted, so that the whole wall thickness of the steel pipe behind the reducing is equivalent.
Further, as shown in fig. 2, a vertical distance L7 between the large end of the second frustum section 31 and the small end of the second frustum section 31 is 800mm-1200mm; preferably, the vertical distance L7 between the large end of the second cone section 31 and the small end of the second cone section 31 is 1000mm, which is set according to the length of the cutting head and the wear. The pierced billet is obtained after the mandrel is used for jacking pipe rolling, and as the large end of the second conical table section 31 is close to the mandrel head 2, the inner diameter of the pierced billet head (the inner diameter of the pierced billet head relative to the second conical table section 31) is larger than the inner diameters of other positions of the pierced billet, the wall thickness of the pierced billet head is further smaller than the wall thickness of other positions of the pierced billet, the pierced billet is reduced by the subsequent sizing and reducing process, the pierced billet head is thickened under the tension rolling action, and the wall thickness of the pierced billet head is further thickened and offset with the wall thickness of the head in a thinner way, so that the whole wall thickness of the finished product pipe obtained after reducing is equivalent (the head for jacking pipe necking is not included).
Further, the outer diameter D of the mandrel body 1 is 14mm to 18mm larger than the outer diameter D1 of the cylindrical section 22, preferably, the outer diameter D of the mandrel body 1 is 16mm larger than the outer diameter D1 of the cylindrical section 22, and the difference between the outer diameter D of the mandrel body 1 of the original mandrel and the outer diameter D1 of the cylindrical section 22 is 8mm. The modified mandrel of the application sets the difference between the outer diameter D of the mandrel main body 1 and the outer diameter D1 of the cylindrical section 22 to be 14mm-18mm, especially 16mm, and can avoid the excessive weight of the difficult rod falling and head cutting caused by too thick wall thickness of the necking end. The outer diameter of the large end of the first frustum section 21 coincides with the outer diameter D1 of the cylindrical section 22.
Further, the total length of the mandrel may be 20 meters at maximum, and the surface hardness of the mandrel is: HRC45-50, and the diameter tolerance of the core rod is 0mm-0.2mm. Since the outer diameter D of the core rod main body 1 is 14mm-18mm larger than the outer diameter D1 of the cylindrical section 22, the single side shoulder height of the core rod is 8+/-1 mm, and the compression can be better during necking.
In the jacking pipe rolling process, a mandrel head 2 is used for jacking pipe necking, and a mandrel main body 1 and a step 3 are used for jacking pipe rolling. The mandrel is used for finishing the pipe jacking rolling process to obtain the required pierced billet, and at the moment, the wall thickness of the head part of the pierced billet is thinner than that of other positions. And after the pipe jacking rolling process is completed, the blank pipe is subjected to a reducing process to obtain the required finished pipe. When the thickness of the wall thickness of the rear head part of the capillary tube passes through the reducing mill, the thickness of the wall thickness of the head part of the former stage (the top tube rolling stage) is offset, so that the whole wall thickness of the reduced steel tube is equivalent, the cutting head of the steel tube is reduced, and the yield is improved.
In one embodiment of the application, a modified mandrel with the diameter of 145mm is utilized to carry out pipe jacking rolling on a steel pipe with the finished product specification of 127 multiplied by 6, the wall thickness of the head part of the pierced billet obtained after the pipe jacking rolling is 5.6mm (the head part of the pierced billet for pipe jacking is not included), the pierced billet is subjected to reducing sizing treatment, and the wall thickness of the head part of the pierced billet is increased by 0.4mm, so that the wall thickness of the head part of the pierced billet is consistent with the wall thickness of other positions of the pierced billet, and the steel pipe with the required outer diameter of 127mm and the wall thickness of 6mm is obtained.
In another embodiment of the present application, steel pipes with gauge 127×8 were produced using the original mandrel and the modified mandrel, respectively, and the comparison results of specific parameters are shown in table 1.
TABLE 1 comparison results of gauge (Specification) production of 127X 8 (outer diameter 127mm X wall thickness 8 mm) using the original core rod and the modified core rod of the present application, respectively
In the practical application process, the invention is successfully applied to the online production of four core rod series, the purposes of reducing the length of a cut end and improving the yield are realized, the cutting loss is reduced from 10.5% in 2015 to 7.73% in 2018, and the cutting loss is reduced by 2.77%; the yield is improved from 84.11% in 2015 to 88.87% in 2018, and the yield is improved by 4.76%, so that obvious economic benefits are obtained.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
The mandrel used in the invention is conical and enlarged compared with the head of the original mandrel, the wall thickness of the head of the steel pipe after jacking is thinner than that of other positions, and the purpose that the wall thickness of the head is thickened and offset with the wall thickness of the head is offset is achieved after passing through the reducing mill, so that the whole wall thickness of the steel pipe after reducing is equivalent. The invention can effectively solve the problem of thickening of the end part of the reduced steel pipe, thereby achieving the aim that the steel pipe has no thickened end after production, reducing the cutting head of the steel pipe and improving the yield.
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 (10)
1. A tapered-end core rod is characterized by comprising a core rod main body and a core rod head, wherein,
Two ends of the core rod main body are provided with one core rod head, the two core rod heads are arranged in a mirror image mode,
The outer diameter of the core rod main body is larger than the outer diameter of the core rod head,
The head of the core rod consists of a first conical section and a cylindrical section, the large end of the first conical section is connected with one end of the cylindrical section, and the other end of the cylindrical section is connected with the core rod main body through a step;
the step is a second conical section, the large end of the second conical section is connected with the other end of the cylindrical section, the small end of the second conical section is connected with the core rod main body,
The outer diameter of the small end of the second conical section is consistent with the outer diameter D of the core rod main body, the outer diameter D3 of the large end of the second conical section is 0.4mm-0.6mm larger than the outer diameter of the small end of the second conical section,
The junction of first frustum section with the cylinder section is through first fillet connection.
2. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The radius R1 of the first rounded corner is 30mm.
3. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The large end of the second conical section is connected with the other end of the cylindrical section through a second round angle.
4. A mandrel according to claim 3, wherein the centre of the second rounded corner is located inside the mandrel;
The radius of the second round angle is 14mm.
5. The mandrel of claim 3, further comprising a third fillet between the second frustum section and the cylindrical section, wherein the second frustum section, the second fillet, the third fillet and the cylindrical section are sequentially arranged, a center of the third fillet is located outside the mandrel, and a radius of the third fillet is 2.5mm.
6. A mandrel according to claim 3, characterised in that the vertical distance L7 between the large end of the second cone section and the small end of the second cone section is 800mm-1200mm;
The vertical distance L7 between the large end of the second conical section and the small end of the second conical section is 1000mm.
7. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The outer diameter D of the core rod main body is 16mm larger than the outer diameter D1 of the cylindrical section, and the outer diameter of the large end of the first conical section is consistent with the outer diameter D1 of the cylindrical section.
8. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The length of the first cone section is L1, the length of the cylindrical section is L2, and L1:L2=1 (2-4).
9. The mandrel of claim 5, wherein the mandrel is configured to be a mandrel,
The length L3 of the second round angle is 12mm;
the length L4 of the third round angle is 2mm.
10. The mandrel of claim 1, wherein the mandrel is configured to be a mandrel,
The surface hardness of the core rod is as follows: HRC 45-50.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010075768.0A CN111151579B (en) | 2020-01-22 | 2020-01-22 | End cone shaped core rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010075768.0A CN111151579B (en) | 2020-01-22 | 2020-01-22 | End cone shaped core rod |
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| CN111151579B true CN111151579B (en) | 2024-05-07 |
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| CN202079182U (en) * | 2011-03-04 | 2011-12-21 | 中信重工机械股份有限公司 | Combined core rod used for conical cylinder body forging with form copying method |
| JP2013126666A (en) * | 2011-12-16 | 2013-06-27 | Nippon Steel & Sumitomo Metal Corp | Cored bar for holding piercing plug |
| CN204685661U (en) * | 2015-06-08 | 2015-10-07 | 通化钢铁集团磐石无缝钢管有限责任公司 | The reducing plug of ACCU ROLL pipe mill |
| CN104998905A (en) * | 2015-08-03 | 2015-10-28 | 山东墨龙石油机械股份有限公司 | Alloy steel, retained mandrel and production method of retained mandrel |
| CN211990265U (en) * | 2020-01-22 | 2020-11-24 | 大冶特殊钢有限公司 | Core rod with conical end |
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| CN111151579A (en) | 2020-05-15 |
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