CN108356078A - Asymmetric roll for size-reducing mill - Google Patents
Asymmetric roll for size-reducing mill Download PDFInfo
- Publication number
- CN108356078A CN108356078A CN201810148391.XA CN201810148391A CN108356078A CN 108356078 A CN108356078 A CN 108356078A CN 201810148391 A CN201810148391 A CN 201810148391A CN 108356078 A CN108356078 A CN 108356078A
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- CN
- China
- Prior art keywords
- roll
- steel pipe
- size
- reducing
- oval
- 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 abstract description 44
- 239000010959 steel Substances 0.000 abstract description 44
- 238000005096 rolling process Methods 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000003801 milling Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/10—Finishing, e.g. smoothing, sizing, reeling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention belongs to hot rolled seamless steel tube technical fields, more particularly, to a kind of asymmetric roll for size-reducing mill, including oval roll, it is characterized in that the oval groove center line of oval roll is not with roll centre overlapping of axles, the oval groove center line of all ellipse rolls is to the side offset distance E of roll centre axis1.The present invention is under the premise of original axial rolling size-reducing mill group is constant, change traditional symmetrical grooving of roll, pass through the left-right asymmetry property on hole type design, make steel pipe during determining tube reducing by a force couple role, and all rolls are all clockwise to the couple that steel tube place applies or are all direction counterclockwise, making steel pipe, there are one small rotations during determining tube reducing, the section that thickens of each rack is just staggered, section is thickened in the same area synergistic effect without rack, the interior side's phenomenon for eliminating steel pipe, greatly improves thickness of steel pipe precision.
Description
Technical field
The invention belongs to hot rolled seamless steel tube technical fields, are rolled for the asymmetric of size-reducing mill more particularly, to a kind of
Roller.
Background technology
Plug, tube reducing and tension diameter-reducing procedure are the continuous rolling process of hollow body not cored bar, Steel Tube Reducing machine
There are many form, can be divided into two rollers, three rollers, four-roller type by roller number.In the axial rolling size-reducing mill operation of rolling if tubing have it is larger
Sizing reduction and thick-walled pipe can make steel pipe inner wall form the inner polygons defects such as interior four directions or interior six side, reduce the wall thickness essence of steel pipe
Degree.By taking three-roll size reducing mill as an example, if Fig. 1 is traditional symmetrical roll oval groove figure of three-roll size reducing mill, in oval groove
Circular arc AB and circular arc BC is symmetrical with roll centre axis OA, and roll arc AB applies resultant force to steel tube place and applies conjunction to steel tube place with arc BC
Power F is equal in magnitude, and steel pipe is not rotated from the gap that three rolls are surrounded by steel pipe.Three rollers determine six sides generation in tube reducing
Additional axial stress is along the circumferentially distributed unevenness of pass, during tube reducing, because flowing of the metal on pass width is uneven, and institute
It is thickened with the wall thickness on pass width also uneven.As shown in Fig. 2, the unit compression that A points are born is maximum, this roll line
Speed is minimum, and axial tension stress is minimum；The unit compression that B points are born is minimum, this roll linear velocity highest, axial tension stress
Maximum, the trend that wall thickness thickens are relatively minimal；It is larger that C point stress states and wall thickness thicken trend.Due to the adjacent machine of tube reducing rack
The arrangement of three rolls is staggered 60 ° in frame, and when tension reaches a certain level, B points wall thickness is totally in the trend of being thinned, C point wall thickness
Overall is in the trend that thickens, and each two rack nearly all forms one section in the region and thickens section, and many racks thicken section in same area
Domain is superimposed, and is thus formed " interior six side ".For thin-wall tube, additional axial stress is smaller for the added influence of wall thickness change,
" interior six side " phenomenon unobvious, but for thick-walled pipe, additional axial stress is larger for the added influence of wall thickness change, " interior six
Side " phenomenon is more apparent, causes wall thickness accuracy to reduce, section design method can only mitigate in thick-walled pipe and just be inclined at present, cannot
Thoroughly eliminate.
The every frame roll axis deflection angle theta of oblique milling size-reducing mill forms oblique milling, there is a small rotation, control when steel pipe being made to advance
Steel pipe is staggered by the section that thickens that every frame size-reducing mill is formed and can thoroughly eliminate interior side's defect when making, but oblique milling size-reducing mill
It is complicated, it is not easy to manufacture；The every frame of deflection angle theta is different, it is difficult to control；Steel pipe only allows have small turn between two frame of technological requirement
Dynamic, deflection angle theta determines difficult；Oblique milling increases rack spacing, and section increase is thickened when subtracting；Though tube reducing is determined in oblique milling for these reasons
Side is but difficult application in capable of eliminating.
Invention content
The object of the present invention is to provide one kind can be eliminated in Steel Tube Reducing Process " interior side " phenomenon for determining tube reducing
The asymmetric roll of machine improves thickness of steel pipe precision.
The purpose of the present invention is what is realized by following technical proposals：
The asymmetric roll for size-reducing mill of the present invention, including oval roll, it is characterised in that oval roll it is ellipse
Circular hole center line is not with roll centre overlapping of axles, and the oval groove center line of all ellipse rolls is to the roll centre
The side offset distance E of axis1。
The offset distance E of the oval groove center line1For 0.01 mm-3mm.
Advantages of the present invention：
The asymmetric roll for size-reducing mill of the present invention is changed under the premise of original axial rolling size-reducing mill group is constant
Traditional symmetrical grooving of roll makes steel pipe during determining tube reducing by the left-right asymmetry property on hole type design
By a force couple role, and all rolls are all clockwise to the couple that steel tube place applies or are all direction counterclockwise, are made
There are one small rotations, the section that thickens of each rack to be just staggered during determining tube reducing for steel pipe, and thickening section without rack exists
The same area synergistic effect eliminates interior side's phenomenon of steel pipe, greatly improves thickness of steel pipe precision.
Description of the drawings
Fig. 1 is the symmetrical roll oval groove figure of traditional three-roll size reducing mill.
Fig. 2 is stress schematic diagram of the steel pipe in Sizing Process by taking traditional three-roll size reducing mill as an example.
Fig. 3 is the roll oval groove figure of the present invention.
Fig. 4 is the asymmetrical roll oval groove steel pipe force diagram by taking three-roll size reducing mill as an example of the present invention.
Specific implementation mode
The specific implementation mode further illustrated the present invention below in conjunction with the accompanying drawings.
As shown in Figures 3 and 4, the asymmetric roll for size-reducing mill of the invention, including oval roll, feature exist
It is not overlapped with roll centre axis OA in the oval groove center line of oval roll, the oval groove center of all ellipse rolls
Line is to the side offset distance E of the roll centre axis1。
The offset distance E of the oval groove center line1For 0.01 mm-3mm.
The asymmetric roll for size-reducing mill of the present invention, including two rollers, three rollers, four-roller type size-reducing mill are extensive at present
The oval groove used, the left-right asymmetry property on axial rolling size-reducing mill hole type design, make steel pipe during determining tube reducing by
One force couple role, making steel pipe, there are one small rotations during determining tube reducing.
For the asymmetrical roll oval groove of three-roll size reducing mill as shown in Figure 3, circular arc AB and circular arc BC is in roll
Mandrel OA is asymmetric, and oval groove center deviates E to the left1, the arc AB of roll elliptical aperture is to steel tube place application resultant force F1With BC pairs of arc
Steel tube place applies resultant force F2Size is unequal, F1＞ F2, steel pipe will act on by resultant couple being rotated in a clockwise direction,
For the asymmetrical roll oval groove steel pipe force diagram of three-roll size reducing mill as shown in Figure 4, remaining two roller aperture type as shown,
Steel pipe is acted on by the resultant couple being rotated in a clockwise direction, and steel pipe is made to rotate clockwise a small angle in this way,
Similarly steel pipe rotates a small angle toward the same direction by remaining all size-reducing mill frame, by institute's organic frame
The section that thickens be not superimposed in the same position, so that thickening for steel pipe is evenly distributed on steel pipe circumferential direction, interior side's phenomenon of steel pipe just disappears
In addition to.
Oval groove off-centring distance E1It can be selected according to pass R sizes, to prevent offset distance E1It is excessive in roller
Cyan line, general E are generated at seam1=0.01 mm-3mm。
For the present invention under the premise of not changing traditional size-reducing mill frame structure, by the improvement on hole type design, left and right is not
Symmetry makes steel pipe be more than resultant force, the position of resultant force suffered by another side hole type with joint efforts suffered by a side hole type and passes through O1Without
By center of circle O, make steel pipe during determining tube reducing by a force couple role, and the couple that all rolls apply steel tube place is same
Clockwise or be all direction counterclockwise, steel pipe to be made to eliminate interior side there are one small rotation during determining tube reducing.
Operation is simple and reliable by the present invention, is greatly improved thickness of steel pipe precision, can especially solve the problems, such as square in thick-walled pipe.
The present invention can be additionally used in hot rolled seamless steel tube and determine tube reducing production.
Claims (2)
1. a kind of asymmetric roll for size-reducing mill, including oval roll, it is characterised in that the ellipse of oval roll
Pass center line is not with roll centre overlapping of axles, and the oval groove center line of all ellipse rolls is to the roll centre axis
Side offset distance E1。
2. the asymmetric roll according to claim 1 for size-reducing mill, it is characterised in that in the oval groove
The offset distance E of heart line1For 0.01mm-3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810148391.XA CN108356078A (en) | 2018-02-13 | 2018-02-13 | Asymmetric roll for size-reducing mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810148391.XA CN108356078A (en) | 2018-02-13 | 2018-02-13 | Asymmetric roll for size-reducing mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108356078A true CN108356078A (en) | 2018-08-03 |
Family
ID=63002403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810148391.XA Pending CN108356078A (en) | 2018-02-13 | 2018-02-13 | Asymmetric roll for size-reducing mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108356078A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06142718A (en) * | 1992-10-30 | 1994-05-24 | Sumitomo Metal Ind Ltd | Method for cold-rolling electric resistance welded tube |
| CN102245321A (en) * | 2008-12-09 | 2011-11-16 | V&M德国有限公司 | Method for producing seamless tubes by means of a three-roll bar rolling mill |
| CN105127204A (en) * | 2015-10-08 | 2015-12-09 | 攀钢集团成都钢钒有限公司 | Method for preventing black thread quality defect of outer surface of steel pipe by using hot-rolling seamless pipe reducing sizing mill |
| CN105363782A (en) * | 2015-11-30 | 2016-03-02 | 太原科技大学 | Stretch-reducing mill working set roll pass |
| US20170216896A1 (en) * | 2014-08-01 | 2017-08-03 | Vallourec Deutschland Gmbh | Method for producing hot-rolled seamless pipes having thickened ends |
| CN208019143U (en) * | 2018-02-13 | 2018-10-30 | 辽宁天丰特殊工具制造股份有限公司 | Asymmetric roll for size-reducing mill |
-
2018
- 2018-02-13 CN CN201810148391.XA patent/CN108356078A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06142718A (en) * | 1992-10-30 | 1994-05-24 | Sumitomo Metal Ind Ltd | Method for cold-rolling electric resistance welded tube |
| CN102245321A (en) * | 2008-12-09 | 2011-11-16 | V&M德国有限公司 | Method for producing seamless tubes by means of a three-roll bar rolling mill |
| US20170216896A1 (en) * | 2014-08-01 | 2017-08-03 | Vallourec Deutschland Gmbh | Method for producing hot-rolled seamless pipes having thickened ends |
| CN105127204A (en) * | 2015-10-08 | 2015-12-09 | 攀钢集团成都钢钒有限公司 | Method for preventing black thread quality defect of outer surface of steel pipe by using hot-rolling seamless pipe reducing sizing mill |
| CN105363782A (en) * | 2015-11-30 | 2016-03-02 | 太原科技大学 | Stretch-reducing mill working set roll pass |
| CN208019143U (en) * | 2018-02-13 | 2018-10-30 | 辽宁天丰特殊工具制造股份有限公司 | Asymmetric roll for size-reducing mill |
Non-Patent Citations (3)
| Title |
|---|
| 张芳萍等: "张力减径机轧辊孔型设计方法的研究", 现代制造工程, no. 10 * |
| 张芳萍等: "张力减径机轧辊孔型设计方法的研究", 现代制造工程, no. 10, 31 October 2006 (2006-10-31), pages 110 - 113 * |
| 石建辉等: "21机架张力减径机椭圆孔型的有限元分析", 钢管, vol. 41, no. 04, pages 18 - 22 * |
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