CN205217605U - Roll of finishing mill - Google Patents
Roll of finishing mill Download PDFInfo
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- CN205217605U CN205217605U CN201520872014.2U CN201520872014U CN205217605U CN 205217605 U CN205217605 U CN 205217605U CN 201520872014 U CN201520872014 U CN 201520872014U CN 205217605 U CN205217605 U CN 205217605U
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- section
- wall
- tapering
- roll
- reducting
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Abstract
The utility model discloses a roll of finishing mill, including the section of biteeing of arranging in proper order, subtract wall section and equal wall sections, the wall section that subtracts divide into that link up in proper order first subtracts the wall section and the second subtracts the wall section, the first tapering that subtracts the wall section is greater than the tapering that the second subtracts the wall section, the backing angle that the second subtracts the wall section is 7 degrees. The utility model discloses simple and practical will subtract the wall section and change two sections into, form to subtract the wall for twice, and steel pipe appearance rounding after the processing does not have the distortion phenomenon, steel wall thickness is even, solves wall thickness difference, the interior pitted skin scheduling problem of tail end end to end.
Description
Technical field
The utility model relates to the manufacture process technology of heavy caliber seamless steel pipe, belongs to hot rolled seamless steel tube and manufactures field, particularly relate to a kind of roll of finishing mill.
Background technology
Seamless steel pipe has hollow section, and a large amount of pipeline being used as conveying fluid, as the pipeline etc. of transfer oil, natural gas, coal gas, water and some solid material.
Usually, the production technology of seamless steel pipe can be divided into cold-drawn and hot rolling two kinds.The production procedure of cold rolling seamless steel is generally complicated than hot rolling, and first pipe will carry out three-roll continuous rolling, will carry out sizing test after extruding, and carries out being cut into short blank through cutting mill; Then enter annealing process, annealing acidic liquid carries out pickling, will notice whether surface has a large amount of foamings to produce, illustrate that the quality of steel pipe does not reach corresponding standard if there is a large amount of foamings to produce during pickling.
Hot rolled seamless steel tube can destroy the cast sturcture of steel ingot, the crystal grain of refinement steel, and the defect eliminating microscopic structure, thus it is closely knit that steel are organized, mechanical property improves.This improvement is mainly reflected in along in rolling direction, thus makes steel be no longer ergodicity to a certain extent.Meanwhile, the bubble formed during cast, crackle and loose, also can by seam under high moderate pressure effect.
Hollow billet rolling is the primary deformable operation that hot rolled seamless steel tube is produced, its effect be make hollow billet wall thickness close to or reach production tube wall thickness, eliminate longitudinal wall unevenness that hollow billet produces in perforation procedure, also can improve hollow forging surfaces externally and internally quality in addition, control hollow forging external diameter and circularity, hollow hollow billet rolls into the hollow forging close to finished size.
As shown in Figure 1, existing roll comprises the section of nipping A, wall-reducting section B and equal wall section, and the tapering E of the section of nipping A is 11.8 °, and the tapering G of wall-reducting section B is 5.15 °, and the tapering H of equal wall section C is 5.4 °; The rolling angle F that existing wall-reducting section B designs is 8 °, but during actual use, roll cannot be transferred to 8 °, and existing roller curve design is unreasonable in addition, causes following problem:
1, roll has concentrated Zona transformans, greatly stressed at Zona transformans during pipe deformation, and the loss of roll is serious;
2, produce light-wall pipe, steel pipe torsional deformation serious (thick-walled pipe is slightly good), tube reducing easily produces blue or green line and wire drawing defect, even the super negative common difference in finished product external diameter local;
3, subtract wall deflection very little, light-wall pipe is produced and is restricted, and tube rolling temperature increases; If add aximal deformation value, mill current is higher;
4, deformed area offsets backward, and equal wall section becomes wall-reducting section, increases the eccentricity of steel pipe;
5, steel pipe is nipped weak effect, often needs to push by force, easily broken head and roll card.
Utility model content
For overcoming problems of the prior art, the utility model provides a kind of roll of finishing mill, wall-reducting section is changed into two sections, rationally effectively make use of the length of roll, reduces the load because of the strenuous vibration and power transmission shaft concentrating distortion generation.
Concrete technical scheme of the present utility model is as follows:
A roll for finishing mill, comprise the section of nipping, wall-reducting section and the equal wall section of arranging successively, described wall-reducting section is divided into the first wall-reducting section and the second wall-reducting section that are connected successively, and the tapering of the first wall-reducting section is greater than the tapering of the second wall-reducting section;
The tapering of the first wall-reducting section is 14 degree, and the tapering of the second wall-reducting section is 7 degree, and the rolling angle of the second wall-reducting section is 7 degree.
Wall-reducting section in the utility model is divided into the first wall-reducting section and the second wall-reducting section, is formed and subtracts wall twice, disperses the concentrated Zona transformans existed in existing roll, pressure suffered during alleviation pipe deformation, and can alleviate the loss of roll.
Preferably, described in, the tapering of the section of nipping is 9 degree.
In the utility model, the section of the nipping tapering after roll improves is 9 degree, is less than existing 11.8 degree, changes the little section of nipping tapering, solve the problem that roll larynx footpath point overlaps with frame central line, is beneficial to the ovality controlling steel pipe.
Preferably, described in the porch of the section of nipping be provided with entrance cone angle section, the tapering of the section of nipping described in the tapering of described entrance cone angle section is greater than, the tapering of described entrance cone angle section is 12 degree.
The utility model is added to prostomum angle section at the entrance of the section of nipping, and this entrance cone angle section has less tapering, is more conducive to nipping smoothly of rolling pipe.
Preferably, the length of described first wall-reducting section is 1/10 ~ 1/2 of whole wall-reducting section length.
After concentrating Zona transformans by the first wall-reducting section and the dispersion of the second wall-reducting section, the torsional deformation of thin-wall steel tube can be alleviated, avoid the defect occurring black hair or wire drawing.
Preferably, the exit of described equal wall section is connected Toe angle section, and the external diameter change of described Toe angle section is in reverse to described equal wall section.
The utility model adds Toe angle section, and the external diameter of this Toe angle section reduces gradually, solves after producing and pricks card phenomenon, make administration measure.
Preferably, the tapering of described equal wall section is 3.5 degree.
The utility model also reduces the tapering of equal wall section, avoids deformed area to offset backward, is conducive to thickness of steel pipe even.
The utility model is simple and practical, wall-reducting section is changed into two sections, is formed and subtracts wall twice, and the steel pipe profile rounding after processing, does not have torsional deformation phenomenon; Thickness of steel pipe is even, solves that head and tail wall thickness is poor, the problem such as pitted skin in tail end.
Accompanying drawing explanation
Fig. 1 is the roller curve of existing roll;
Fig. 2 is the roller curve of roll in the utility model.
Detailed description of the invention
As shown in Figure 2, a kind of roll of finishing mill, includes prostomum angle section 1, the section of nipping 2, first wall-reducting section 3, second wall-reducting section 4, all wall section 5 and Toe angle section 6.
The length of entrance cone angle section 1, the section of nipping 2, first wall-reducting section 3, second wall-reducting section 4, all wall section 5 and Toe angle section 6 is than being 121.29:420:70:335:453.71:80.Wherein, entrance cone angle section 1, the section of nipping 2, first wall-reducting section 3, second wall-reducting section 4 and equal length of wall section 5 and equal with the length of existing roll.
In the present embodiment, the tapering 7 of entrance cone angle section 1 is 12 degree, and edge adopts arc transition.The tapering 8 of the section of nipping 2 is 9 degree.
The tapering 9 of the first wall-reducting section 3 is 14 degree, and the tapering 11 of the second wall-reducting section 4 is 7 degree, and the rolling angle 10 of the second wall-reducting section 4 is 7 degree, and the rolling angle of whole wall-reducting section still remains 8 degree.
The tapering 12 of equal wall section 5 is 3.5 degree.The external diameter of Toe angle section reduces gradually, change oppositely, and the edge of Toe angle section also adopts arc transition with the external diameter of equal wall section.
The present embodiment redesigns roller curve by 8 ° of rolling angles, changes original roll three sections of curves into six sections of curves.Be added to prostomum angle section, rolling pipe is nipped more smoothly.The section of nipping tapering changes little, solves the problem that roll larynx footpath point overlaps with frame central line, is beneficial to the ovality controlling steel pipe.Wall-reducting section changes two sections into, rationally effectively make use of the length of roll, reduces the load because of the strenuous vibration and power transmission shaft concentrating distortion generation.Equal wall segment length lengthens, and forms a more than pitch, and deflection reduces, and plays effective all wall effects.To increase export cone angle section, solve after producing and prick card phenomenon, make administration measure.
Through producing the practice of ￠ 559 × 21 gas cylinder tube, the roll successful after improvement.Hollow billet enters finish rolling entrance cone angle section smoothly, once nips, subtracts wall through twice, arrives equal wall section, goes out milling train smoothly.Steel pipe profile rounding, does not have torsional deformation phenomenon; Subtract wall effective, milling train electric current is A more than 2000 only, than existing minimizing more than 20%; Hot dimension control, thickness of steel pipe is even, than good in the past, little with cross section Wall-Thickness Difference; Solve the problem of pitted skin in poor, the tail end of head and tail wall thickness; Steel pipe is nipped and is clearly better, and once pushes.
The foregoing is only better implementation example of the present utility model, be not limited to the utility model, all within the utility model spirit and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. the roll of a finishing mill, comprise the section of nipping, wall-reducting section and the equal wall section of arranging successively, it is characterized in that, described wall-reducting section is divided into the first wall-reducting section and the second wall-reducting section that are connected successively, the tapering of the first wall-reducting section is greater than the tapering of the second wall-reducting section, and the rolling angle of the second wall-reducting section is 7 degree.
2. roll as claimed in claim 1, it is characterized in that, the tapering of the first wall-reducting section is 14 degree, and the tapering of the second wall-reducting section is 7 degree.
3. roll as claimed in claim 1, is characterized in that, described in the tapering of the section of nipping be 9 degree.
4. the roll as described in claim 1 or 3, is characterized in that, described in the porch of the section of nipping be provided with entrance cone angle section, the tapering of the section of nipping described in the tapering of described entrance cone angle section is greater than.
5. roll as claimed in claim 4, it is characterized in that, the tapering of described entrance cone angle section is 12 degree.
6. roll as claimed in claim 1, it is characterized in that, the length of described first wall-reducting section is 1/10 ~ 1/2 of whole wall-reducting section length.
7. roll as claimed in claim 1, is characterized in that, the exit of described equal wall section is connected Toe angle section, and the external diameter change of described Toe angle section is in reverse to described equal wall section.
8. roll as claimed in claim 7, it is characterized in that, the tapering of described equal wall section is 3.5 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520872014.2U CN205217605U (en) | 2015-11-03 | 2015-11-03 | Roll of finishing mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520872014.2U CN205217605U (en) | 2015-11-03 | 2015-11-03 | Roll of finishing mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205217605U true CN205217605U (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520872014.2U Active CN205217605U (en) | 2015-11-03 | 2015-11-03 | Roll of finishing mill |
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| Country | Link |
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| CN (1) | CN205217605U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238464A (en) * | 2016-08-03 | 2016-12-21 | 太原磬泓机电设备有限公司 | Oblique milling seamless steel pipe pipe end rolling method for sharpening |
| CN115608784A (en) * | 2022-12-16 | 2023-01-17 | 太原理工大学 | Large length-diameter ratio heterogeneous metal composite thin-walled tube progressive skew rolling composite equipment and method thereof |
-
2015
- 2015-11-03 CN CN201520872014.2U patent/CN205217605U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238464A (en) * | 2016-08-03 | 2016-12-21 | 太原磬泓机电设备有限公司 | Oblique milling seamless steel pipe pipe end rolling method for sharpening |
| CN115608784A (en) * | 2022-12-16 | 2023-01-17 | 太原理工大学 | Large length-diameter ratio heterogeneous metal composite thin-walled tube progressive skew rolling composite equipment and method thereof |
| CN115608784B (en) * | 2022-12-16 | 2023-03-07 | 太原理工大学 | Large length-diameter ratio heterogeneous metal composite thin-walled tube progressive skew rolling composite equipment and method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 312300 Xiaoyue Street Industrial Zone, Shangyu District, Shaoxing City, Zhejiang Province Patentee after: Zhejiang Taifu Seamless Steel Pipe Co., Ltd Address before: 312367 Small Town Industrial Zone, Shangyu District, Zhejiang, Shaoxing Patentee before: Zhejiang Gross Seamless Tube Co., Ltd. |