CN105234179B - Technique for sizing thick-walled seamless steel tubes through two-roller skew rolling mill and technique for rolling thick-walled seamless steel tubes through two-roller skew rolling mill - Google Patents
Technique for sizing thick-walled seamless steel tubes through two-roller skew rolling mill and technique for rolling thick-walled seamless steel tubes through two-roller skew rolling mill Download PDFInfo
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- CN105234179B CN105234179B CN201510732727.3A CN201510732727A CN105234179B CN 105234179 B CN105234179 B CN 105234179B CN 201510732727 A CN201510732727 A CN 201510732727A CN 105234179 B CN105234179 B CN 105234179B
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- 238000004513 sizing Methods 0.000 title claims abstract description 119
- 238000005096 rolling process Methods 0.000 title claims abstract description 118
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000005242 forging Methods 0.000 claims description 72
- 230000008569 process Effects 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000003801 milling Methods 0.000 abstract 4
- 238000004519 manufacturing process Methods 0.000 description 13
- 230000008901 benefit Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
Abstract
The invention discloses a technique for sizing thick-walled seamless steel tubes through a two-roller skew rolling mill. The sizing technique comprises the steps of (1) adjusting the milling roller distance of the two-roller skew rolling mill to enable the milling roller distance to be 1.01-1.05 times of the outer diameter of a finished steel tube, and adjusting the guide disk distance of the two-roller skew rolling mill to enable the guide disk distance to be 1.02-1.10 times of the roller distance; and (2) sleeving a crude tube on a sizing core rod of the two-roller skew rolling mill, and conducting sizing and rolling and obtaining the thick-walled seamless steel tubes under the action of milling rollers and guide disks. During sizing and rolling, the portion, in contact with the milling rollers, of the crude tube serves as a rolled section, and a gap is always reserved between the inner wall of the rolled section and the sizing core rod. According to the sizing technique, the cost of a sizing skew rolling mill is saved, only core rods with the appropriate diameters are needed, the producing cost is greatly saved, and the sale prospect is improved. Furthermore, the sized seamless steel tubes have the beneficial effects of being high in geometric dimension accuracy, good in straightness and free of crack. The invention further discloses a technique for rolling the thick-walled seamless steel tubes through the two-roller skew rolling mill.
Description
Technical field
The present invention relates to a kind of fixed diameter process, especially a kind of utilization two-roller skew-rolling machine carry out the sizing of thick-walled seamless steel pipes
Technique, the invention further relates to a kind of rolling mill practice, especially a kind of utilization two-roller skew-rolling machine carry out the rolling of thick-walled seamless steel pipes
Technique.
Background technology
Seamless steel pipe is that one kind has hollow section, periphery non-jointed circular, square or rectangle steel.It is seamless at present
In steel pipe's production, two-roller skew-rolling unit is a kind of important production equipment, and the technological process of the production equipment is：Heating process-
The sizing operation for subtracting wall operation-sizing mill of perforation process-two-roller skew-rolling machine.In above-mentioned technique, pipe is added by heating furnace
Temperature of the heat to suitable deformation；Solid pipe is worn into by hollow hollow billet by perforating machine；By two-roller skew-rolling machine tube rolling pair
The tube wall of hollow billet carries out subtracting wall and extends and hollow forging is obtained；The circumference of hollow forging is entered by professional etiquette by sizing mill and justifies sizing.
Wherein, as shown in Figure 1, 2, the warp tool of two-roller skew-rolling machine includes roll 1a, godet 2a and plug 3a, roll 1a
It is main warp tool, godet 2a is steering tool, and plug 3a is interior warp tool.Roll 1a drives hollow forging 4a to revolve in advance
Turn, hollow forging 4a is rolled in the gap of roll 1a and plug 3a, godet 2a plays closed type, limits the horizontal of hollow forging 4a
The effect of deformation.The effect of two-roller skew-rolling machine, mainly complete hollow forging 4a subtract wall extension, and the diameter change of hollow forging 4a is little,
Typically within ± 10%.
Sizing mill, to the rule of hollow forging 4a circle Sizing Process, is for hollow forging 4a obtained by correcting when two-roller skew-rolling machine subtracts wall operation
Two ends caliber is unbalanced, and why occurs that hollow forging 4a two ends caliber is unbalanced, is because that subtracting wall operation hollow billet out enters
When in two-roller skew-rolling machine, due to first going out, the temperature of hollow forging 4a ends of two-roller skew-rolling machine is relatively low, after go out the hollow forging of two-roller skew-rolling machine
The temperature of 4a ends is higher, and, in cooling, because inhomogeneous cooling weighing apparatus occurs in temperature difference, therefore it is straight to result in hollow forging 4a both ends for both
Footpath is unbalanced.
In sizing operation, mainly by the method for interior expanding or outer tube reducing, on the premise of hollow forging 4a wall thickness is not changed,
By hollow forging 4a external diameters (or internal diameter) size Control within standard is required.It is interior expanding：Also referred to as interior sizing, typically adopts thermal expansion mode
Molding, by tooling strength and equipment limit, generally produces large-caliber thin-walled hollow forging 4a, it is impossible to for heavy wall pipe spy heavy wall hollow forging 4a
Sizing.Outer tube reducing：Generally using the roll-type sizing mill of axial rolling formula, due to being limited by capacity of equipment, existing tube reducing hollow forging 4a
Wall thickness maximum can only accomplish nearly 80mm.In addition, the roll-type sizing mill of outer tube reducing is also using a kind of roller trio skew rolling (also referred to as Ah
Sai Er pipe mills) sizing mode, sizing is also referred to as turned round, is adapted to production heavy wall pipe spy heavy wall hollow forging 4a.But, the equipment is because adopting three
Roller deforms, and without 3 restrained deformation area external diameter of godet, hollow forging 4a transverse section circular arc curvature changes greatly, often because alternating bending deforms, shape
Into rolled over and internal fissure；In addition, equipment is complicated, and investment is big, it is difficult to promote.
In sum, one of advantage of traditional two-roller skew-rolling unit is that to change specification fast, is particularly suitable for meeting client small quantities of
Amount, many specifications, fast demand of delivering goods；But its applicable specification limit relative narrower, it is impossible to meet specification limit change it is wider, batch
The larger production of amount needs.But, if the fixed diameter process of seamless steel pipe will be simplified, on the premise of production cost is saved, also
Seamless steel pipe geometric accuracy after sizing to be ensured is high, directly spends, and the advantages of flawless defect, is existing technical staff institute
Problem demanding prompt solution.
The content of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of use for avoiding sizing skew rolling mill, only needs to utilize
Two-roller skew-rolling machine is achievable fixed diameter process, can be particularly used for after the seamless steel pipe to heavy wall carries out sizing, and sizing
Seamless steel pipe has the advantages that geometric accuracy is high, directly spends, the fixed diameter process of flawless.
A kind of utilization two-roller skew-rolling machine carries out the fixed diameter process of thick-walled seamless steel pipes, including：
1) adjust the roller of two-roller skew-rolling machine away from roller being made away from 1.01-1.05 times for fished pipe external diameter；Adjustment
The godet of two-roller skew-rolling machine away from, make godet away from for the roller away from 1.02-1.10 times；
2) hollow forging is sheathed on the sizing plug of two-roller skew-rolling machine, carries out sizing in the presence of the roll and godet
Roll and obtain thick-walled seamless steel pipes；
The position contacted with roll on hollow forging during fixed diameter rolling is rolling section, between the inwall and sizing plug of the rolling section
All the time leave gap.
In the present invention, the external diameter of sizing plug is adjusted first according to the internal diameter of hollow forging, it is ensured that sizing plug and waste inside pipe wall
All the time leave gap so that sizing plug can be played a supporting role to hollow forging in Sizing Process, without the wall thickness to hollow forging
Play extruding；Then only hollow forging need to be sheathed on the sizing plug of two-roller skew-rolling machine, at the same respectively to roller away from and godet
Away from being adjusted, so as to the sizing for realizing hollow forging is operated.The fixed diameter process has been saved and has been produced into without using sizing skew rolling mill
This；Also solving traditional sizing skew rolling mill cannot carry out the defect of sizing to thick-walled seamless steel pipes simultaneously, at most only need to be equipped with
The sizing plug of suitable diameter, so as to greatly save production cost, is conducive to the decline of product price, and then improves pin
Pre-sales scape.
In fixed diameter process, godet away from consistently greater than roll away from, and godet away from roll away from difference more traditional subtract
It is little in the technique of footpath, this is because in fixed diameter process, godet away from no longer functioning only as the supporting role to hollow forging, but also to famine
Pipe perisporium plays squeezing action, and auxiliary roller determines the rule circle sizing of hollow forging circumference.Therefore, the godet being now placed on hollow forging circumference
The power born compared with traditional reducing process in it is big many, for the sizing of hollow forging in fixed diameter process is also requisite.
In fixed diameter process, the sizing plug in the present invention on two-roller skew-rolling machine can't be extruded to hollow forging, but
Due to hollow forging it is general longer, so needing for sizing plug carries out certain supporting role to which from inside hollow forging.If fixed
Spacing between footpath plug and hollow forging is too small, then sizing plug can be extruded to waste inside pipe wall in Sizing Process, so as to enter one
Step reduces the wall thickness of hollow forging, the sizing of wall thickness needed for interference；If spacing is excessive, sizing plug cannot carry out propping up to hollow forging
Support, so that hollow forging deforms because of reasons such as gravity in Sizing Process, the sizing of wall thickness needed for same interference.Cause
This, it is described rolling section inwall and sizing plug between gap be 30～50mm, namely the press section at hollow forging inwall and
Gap between sizing plug is 30～50mm.
Due to the wall thickness of seamless steel pipe it is less, then using traditional sizing skew rolling mill, thus in order to improve production effect
Benefit, so the wall thickness of the thick-walled seamless steel pipes is at least 80mm (such as 90～150mm), also only under such wall thickness,
The fixed diameter process of the present invention could realize its optimal economic benefit.
The invention has the beneficial effects as follows, to solve traditional sizing skew rolling mill and sizing cannot be carried out to thick-walled seamless steel pipes lack
Fall into, and save the expense for being equipped with sizing skew rolling mill, at most only need to be equipped with the sizing plug of suitable diameter, so as to big
Production cost is saved greatly, is conducive to the decline of product price, and then the seamless steel pipe improved after prospect for sales, and sizing to have
Geometric accuracy is high, directly spend, flawless the advantages of.
In order to overcome the deficiencies in the prior art, the invention provides a kind of use for avoiding sizing skew rolling mill, only needs to utilize
Two-roller skew-rolling machine is the rolling mill practice of achievable sizing operation, can particularly be used for rolling the seamless steel pipe of heavy wall,
And the seamless steel pipe after rolling have the advantages that geometric accuracy is high, directly spend, the rolling mill practice of flawless.
A kind of rolling mill practice of thick-walled seamless steel pipes, successively including heating process, perforation process, subtract wall operation and sizing work
Sequence, the wall operation that subtracts are carried out using two-roller skew-rolling machine, and the sizing operation includes：
1) adjustment subtracts the roller of the two-roller skew-rolling machine used during wall operation away from making roller away from for fished pipe external diameter
1.01-1.05 again；Adjust the godet of the two-roller skew-rolling machine away from, make godet away from for the roller away from 1.02-1.10 times；
2) plug that the two-roller skew-rolling machine is used when wall operation is subtracted is replaced by into sizing plug, will be obtained after wall operation will be subtracted
To hollow forging be sheathed on sizing plug, carry out fixed diameter rolling in the presence of the roll and godet and obtain the seamless steel of heavy wall
Pipe；
The position contacted with roll on hollow forging during fixed diameter rolling is rolling section, between the inwall and sizing plug of the rolling section
All the time leave gap.
In sizing operation in the present invention, the external diameter of sizing plug is adjusted first according to the internal diameter of hollow forging, it is ensured that sizing core
Rod and waste inside pipe wall leave gap all the time so that sizing plug can be played a supporting role to hollow forging in Sizing Process, without
Extruding is played to the wall thickness of hollow forging；Then only hollow forging need to be sheathed on the sizing plug of two-roller skew-rolling machine, while respectively to rolling
Roller roll spacing and godet away from being adjusted, so as to the sizing for realizing hollow forging is operated.The fixed diameter process is without using sizing skew rolling mill, section
About production cost；Also solving traditional sizing skew rolling mill cannot carry out the defect of sizing to thick-walled seamless steel pipes simultaneously, at most
Only need to be equipped with the sizing plug of suitable diameter, so as to greatly save production cost, be conducive to the decline of product price,
And then improve prospect for sales.In addition, in fixed diameter process, godet away from consistently greater than roll away from, and godet away from roll away from
Little in the more traditional reducing process of difference, this is because in fixed diameter process, godet is away from no longer functioning only as the support to hollow forging
Effect, but also squeezing action is played to hollow forging perisporium, auxiliary roller determines the rule circle sizing of hollow forging circumference.Therefore, it is now placed in
The power born by godet on hollow forging circumference compared with traditional reducing process in it is big many, for the sizing of hollow forging in fixed diameter process
It is also requisite.
In fixed diameter process, the sizing plug in the present invention on two-roller skew-rolling machine can't be extruded to hollow forging, but
Due to hollow forging it is general longer, so needing for sizing plug carries out certain supporting role to which from inside hollow forging.If fixed
Spacing between footpath plug and hollow forging is too small, then sizing plug can be extruded to waste inside pipe wall in Sizing Process, so as to enter one
Step reduces the wall thickness of hollow forging, the sizing of wall thickness needed for interference；If spacing is excessive, sizing plug cannot carry out propping up to hollow forging
Support, so that hollow forging deforms because of reasons such as gravity in Sizing Process, the sizing of wall thickness needed for same interference.Cause
This, it is described rolling section inwall and sizing plug between gap be 30～50mm, namely the press section at hollow forging inwall and
Gap between sizing plug is 30～50mm.
Due to the wall thickness of seamless steel pipe it is less, then using traditional sizing skew rolling mill, thus in order to improve production effect
Benefit, so the wall thickness of the thick-walled seamless steel pipes is at least 80mm (such as 90～150mm), also only under such wall thickness,
The fixed diameter process of the present invention could realize its optimal economic benefit.
In the sizing operation, axis and the horizontal plane angle of roll are roll off angle, and the roll off angle is 7-8 °, the scope
When roll off angle rolls sizing to hollow forging, the ovality of steel pipe is little, and mill current is little.
In the sizing operation, the axis of roll is feed angle with the angle of vertical plane, and the feed angle is 6-7 °, the scope
Feed angle steel pipe during the rolling sizing of hollow forging is easily nipped.
The invention has the beneficial effects as follows：Solving traditional sizing skew rolling mill and sizing cannot being carried out to thick-walled seamless steel pipes lack
Fall into, and save the expense for being equipped with sizing skew rolling mill, at most only need to be equipped with the sizing plug of suitable diameter, so as to big
Production cost is saved greatly, is conducive to the decline of product price, and then the seamless steel pipe improved after prospect for sales, and sizing to have
Geometric accuracy is high, directly spend, flawless the advantages of.
Description of the drawings
Fig. 1 is the structural representation that traditional two-roller skew-rolling machine subtracts godet, roll, hollow forging and plug cooperation in wall technique.
Fig. 2 is the fragmentary sectional view of roll, hollow forging and plug cooperation in traditional fixed diameter process.
Fig. 3 is the fragmentary sectional view of roll, hollow forging and plug cooperation in embodiment of the present invention fixed diameter process.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 3, the present embodiment is realized by two-roller skew-rolling machine, two-roller skew-rolling machine includes that two is symmetrical
Roll 1, two symmetrical godet (not shown)s, and the sizing plug 3 with top, as two-roller skew-rolling machine is known skill
Art, therefore the specific descriptions to two-roller skew-rolling machine are eliminated, in case these unnecessary details are affected to technical solution of the present invention
Description.
Embodiment 1 carries out the fixed diameter process of thick-walled seamless steel pipes using two-roller skew-rolling machine
1) if the external diameter for wanting finished product steel pipe is 610mm, 1 roll spacing of roll of two-roller skew-rolling machine is adjusted, roll 1 is made
616mm (610mm*1.01 times) of the roll spacing for fished pipe external diameter；
The godet of adjustment two-roller skew-rolling machine is away from making godet away from the 628mm (616mm*1.02 times) for 1 roll spacing of roll；
2) hollow forging 4 is sheathed on the sizing plug 3 of two-roller skew-rolling machine, carries out sizing in the presence of roll 1 and godet
Thick-walled seamless steel pipes are rolled and obtain, the wall thickness of the thick-walled seamless steel pipes is 120mm；
The position contacted with roll 1 on hollow forging 4 during fixed diameter rolling is rolling section 41, the inwall and sizing of the rolling section 41
All the time gap 2 is left between plug 3, and the gap 2 is 30mm.
Obtained thick-walled seamless steel pipes outside diameter tolerance is consistent with sizing outer diameter of steel pipes deviation.Statistical data is as follows：
The rolling mill practice of 2 thick-walled seamless steel pipes of embodiment
Include heating process, perforation process successively, subtract wall operation and sizing operation, subtract wall operation and entered using two-roller skew-rolling machine
OK,
Sizing operation includes：
If 1) external diameter for wanting finished product steel pipe is 660mm, adjustment subtracts the two-roller skew-rolling machine that uses during wall operation
1 roll spacing of roll, makes 1 roll spacing of roll be 1.01 times of fished pipe external diameter；
The godet of adjustment two-roller skew-rolling machine is away from making godet away from 1.02 times for 1 roll spacing of roll；
2) plug that two-roller skew-rolling machine is used when wall operation is subtracted is replaced by into sizing plug 3, will be obtained after wall operation will be subtracted
Hollow forging 4 be sheathed on sizing plug 3, carry out fixed diameter rolling in the presence of roll 1 and godet and obtain thick-walled seamless steel pipes,
The wall thickness of the thick-walled seamless steel pipes is 102mm；
The position contacted with roll 1 on hollow forging 4 during fixed diameter rolling is rolling section 41, the inwall and sizing of the rolling section 41
All the time gap is left between plug 3, and the gap is 30mm.
Obtained thick-walled seamless steel pipes outside diameter tolerance is consistent with sizing outer diameter of steel pipes deviation.Statistical data is as follows：
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of utilization two-roller skew-rolling machine carries out the fixed diameter process of thick-walled seamless steel pipes, it is characterized in that, including：
1) adjust the roller of two-roller skew-rolling machine away from roller being made away from 1.01-1.05 times for fished pipe external diameter；Adjust two rollers
The godet of skew rolling mill away from, make godet away from for the roller away from 1.02-1.10 times；
2) hollow forging is sheathed on the sizing plug of two-roller skew-rolling machine, carries out fixed diameter rolling in the presence of the roll and godet
And obtain thick-walled seamless steel pipes；
The position contacted with roll on hollow forging during fixed diameter rolling is rolling section, between the inwall and sizing plug of the rolling section all the time
Leave gap.
2. utilization two-roller skew-rolling machine according to claim 1 carries out the fixed diameter process of thick-walled seamless steel pipes, it is characterized in that, institute
The gap stated between the inwall and sizing plug of rolling section is 30～50mm.
3. utilization two-roller skew-rolling machine according to claim 2 carries out the fixed diameter process of thick-walled seamless steel pipes, it is characterized in that, institute
The wall thickness for stating thick-walled seamless steel pipes is at least 80mm.
4. a kind of rolling mill practice of thick-walled seamless steel pipes, successively including heating process, perforation process, subtract wall operation and sizing work
Sequence, is characterized in that, the wall operation that subtracts is carried out using two-roller skew-rolling machine, and the sizing operation includes：
1) adjustment subtracts the roller of the two-roller skew-rolling machine used during wall operation away from making roller away from for fished pipe external diameter
1.01-1.05 again；Adjust the godet of the two-roller skew-rolling machine away from, make godet away from for the roller away from 1.02-1.10 times；
2) plug that the two-roller skew-rolling machine is used when wall operation is subtracted is replaced by into sizing plug, is obtained after wall operation being subtracted
Hollow forging is sheathed on sizing plug, carries out fixed diameter rolling and obtain thick-walled seamless steel pipes in the presence of the roll and godet；
The position contacted with roll on hollow forging during fixed diameter rolling is rolling section, between the inwall and sizing plug of the rolling section all the time
Leave gap.
5. the rolling mill practice of thick-walled seamless steel pipes according to claim 4, is characterized in that, the inwall of the rolling section with it is fixed
Gap between the plug of footpath is 30～50mm.
6. the rolling mill practice of thick-walled seamless steel pipes according to claim 5, is characterized in that, the wall of the thick-walled seamless steel pipes
It is thick to be at least 80mm.
7. the rolling mill practice of thick-walled seamless steel pipes according to claim 6, is characterized in that, in the sizing operation, roll
Axis and horizontal plane angle be roll off angle, the roll off angle is 7-8 °.
8. the rolling mill practice of thick-walled seamless steel pipes according to claim 7, is characterized in that, in the sizing operation, roll
The angle of axis and vertical plane be feed angle, the feed angle is 6-7 °.
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| CN201510732727.3A CN105234179B (en) | 2015-11-02 | 2015-11-02 | Technique for sizing thick-walled seamless steel tubes through two-roller skew rolling mill and technique for rolling thick-walled seamless steel tubes through two-roller skew rolling mill |
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| CN201510732727.3A CN105234179B (en) | 2015-11-02 | 2015-11-02 | Technique for sizing thick-walled seamless steel tubes through two-roller skew rolling mill and technique for rolling thick-walled seamless steel tubes through two-roller skew rolling mill |
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| DE102016215130A1 (en) * | 2016-08-15 | 2018-02-15 | Sms Group Gmbh | Rolling mill with a slanting mill according to the Asselverfahren |
| CN106378582B (en) * | 2016-09-07 | 2018-07-24 | 重庆科技学院 | The preparation method of GH4169 high temperature alloy pipes |
| CN106903169B (en) * | 2017-04-06 | 2018-12-18 | 北京京诚之星科技开发有限公司 | A kind of plug elongator |
| CN110252814B (en) * | 2019-03-18 | 2021-03-16 | 西北工业大学 | Two-roller inclined rolling perforation method for titanium alloy solid bar billet |
| CN110076198B (en) * | 2019-04-30 | 2020-02-28 | 北京科技大学 | Two-roller skew rolling forming device and method for round bar |
| CN113564327A (en) * | 2021-07-20 | 2021-10-29 | 浙江泰富无缝钢管有限公司 | Heat treatment process suitable for manufacturing thick-wall steel pipe for power station boiler |
| CN116550758B (en) * | 2023-07-06 | 2023-09-12 | 太原理工大学 | Efficient sizing adjustment skew rolling equipment and method for seamless metal corrugated composite pipe |
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| BE387492A (en) * | 1931-04-04 | |||
| GB1573018A (en) * | 1975-12-29 | 1980-08-13 | Mannesmann Ag | Roll pass design |
| JPS5846364B2 (en) * | 1978-09-28 | 1983-10-15 | 住友金属工業株式会社 | Pipe rolling method in reeling mill |
| JP2004306037A (en) * | 2003-04-01 | 2004-11-04 | Sanyo Special Steel Co Ltd | Method for controlling hot sizing of seamless steel tube |
| CN100515589C (en) * | 2007-05-23 | 2009-07-22 | 烟台鲁宝钢管有限责任公司 | Technologic process and special apparatus for rolling seamless steel pipe |
| CN201735585U (en) * | 2010-04-30 | 2011-02-09 | 太原通泽重工有限公司 | Grouped two-roll reducing mill |
| CN104259207A (en) * | 2014-09-22 | 2015-01-07 | 新兴铸管股份有限公司 | Dual-roller inclined rolling perforating technology for hot rolling seamless steel tube |
| CN204194428U (en) * | 2014-10-30 | 2015-03-11 | 太仓新宝谊钢管制造有限公司 | A kind of Steel Tube Reducing machine |
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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. |
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