CN105234179A - 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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- CN105234179A CN105234179A CN201510732727.3A CN201510732727A CN105234179A CN 105234179 A CN105234179 A CN 105234179A CN 201510732727 A CN201510732727 A CN 201510732727A CN 105234179 A CN105234179 A CN 105234179A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 123
- 238000004513 sizing Methods 0.000 title claims abstract description 119
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005242 forging Methods 0.000 claims description 73
- 230000008569 process Effects 0.000 claims description 40
- 230000000694 effects Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 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 12
- 230000008901 benefit Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005452 bending 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
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
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- 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
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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 fixed diameter process utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes, the invention still further relates to a kind of rolling mill practice, especially a kind of rolling mill practice utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes.
Background technology
Seamless steel pipe is that one has hollow section, periphery does not have jointed circle, square or rectangle steel.In current seamless steel tube production, two-roller skew-rolling unit is a kind of important production equipment, and the technological process of this production equipment is: the sizing operation subtracting wall operation-sizing mill of heating process-perforation process-two-roller skew-rolling machine.In above-mentioned technique, by heating furnace by the temperature of heating of pipe blank to suitable distortion; By punch, solid pipe is worn into hollow hollow billet; Subtract wall by the tube wall of two-roller skew-rolling machine tube rolling to hollow billet extend and obtain hollow forging; By sizing mill, the circumference of hollow forging is carried out advising round sizing.
Wherein, as shown in Figure 1, 2, the warp tool of two-roller skew-rolling machine comprises roll 1a, godet 2a and plug 3a, and roll 1a is main warp tool, and godet 2a is steering tool, and plug 3a is internal strain instrument.Roll 1a drives advance limit, hollow forging 4a limit to rotate, and make hollow forging 4a rolled in the gap of roll 1a and plug 3a, godet 2a plays closed type, the effect of the transversely deforming of restriction hollow forging 4a.The effect of two-roller skew-rolling machine, the wall that subtracts mainly completing hollow forging 4a extends, and the diameter change of hollow forging 4a is little, generally within ± 10%.
Sizing mill is to the rule circle Sizing Process of hollow forging 4a, unbalanced in order to revise gained hollow forging 4a two ends caliber when two-roller skew-rolling machine subtracts wall operation, and why occur that hollow forging 4a two ends caliber is unbalanced, because subtract wall operation hollow billet out when entering in two-roller skew-rolling machine, because the temperature of the hollow forging 4a end first going out two-roller skew-rolling machine is lower, after to go out the temperature of the hollow forging 4a end of two-roller skew-rolling machine higher, both are when cooling, because temperature difference occurs that inhomogeneous cooling weighs, therefore it is unbalanced to result in hollow forging 4a both ends diameter.
In sizing operation, mainly by the method for interior expanding or outer tube reducing, under the prerequisite not changing hollow forging 4a wall thickness, by hollow forging 4a external diameter (or internal diameter) size Control within standard-required.Interior expanding: also sizing in title, the hot expansion mode of general employing is shaping, limits by tooling strength and equipment, and the large-caliber thin-walled hollow forging 4a of usual production cannot be used for the sizing of heavy wall pipe special heavy wall hollow forging 4a.Outer tube reducing: the roll-type sizing mill usually adopting axial rolling formula, due to the restriction by capacity of equipment, the wall thickness of existing tube reducing hollow forging 4a is maximum can only accomplish 80mm nearly.In addition, the roll-type sizing mill of outer tube reducing also adopts a kind of roller trio skew rolling (also claiming Assel mill) sizing mode, also claims revolution sizing, is applicable to producing heavy wall pipe special heavy wall hollow forging 4a.But this equipment is because adopting three roller distortion, and without godet 3 restrained deformation district external diameter, hollow forging 4a cross section circular arc Curvature varying is large, often because of alternating bending distortion, forms outer folding and internal fissure; In addition, equipment equipment is complicated, and investment is large, 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's small lot, many specifications, fast demand of delivering goods; But its specification limit relative narrower be suitable for, can not meet specification limit and change wider, batch need of production greatly.But if will simplify the fixed diameter process of seamless steel pipe, under the prerequisite saved production cost, also will ensure that the seamless steel pipe geometric accuracy after sizing is high, directly spend, the advantages such as flawless defect are existing technical staff institute problem demanding prompt solutions.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of use avoiding sizing skew rolling mill, only need utilize two-roller skew-rolling machine and achievable fixed diameter process, particularly can be used for carrying out sizing to the seamless steel pipe of heavy wall, and the seamless steel pipe after sizing have high, the straight degree of geometric accuracy well, the fixed diameter process of the advantage such as flawless.
Utilize two-roller skew-rolling machine to carry out a fixed diameter process for thick-walled seamless steel pipes, comprising:
1) adjust the roller distance of two-roller skew-rolling machine, make roller apart from the 1.01-1.05 for fished pipe external diameter doubly; The godet distance of adjustment two-roller skew-rolling machine, makes godet apart from the 1.02-1.10 for described roller distance doubly;
2) hollow forging is sheathed on the sizing plug of two-roller skew-rolling machine, under the effect of described roll and godet, carries out fixed diameter rolling and obtain thick-walled seamless steel pipes;
Position during fixed diameter rolling, hollow forging contacted with roll is rolling section, leaves gap all the time between the inwall of this rolling section and sizing plug.
In the present invention, first according to the external diameter of the internal diameter adjustment sizing plug of hollow forging, ensure that sizing plug and waste inside pipe wall leave gap all the time, sizing plug can be played a supporting role to hollow forging in Sizing Process, but can not play extruding to the wall thickness of hollow forging; Then only hollow forging need be sheathed on the sizing plug of two-roller skew-rolling machine, breaker roll roll spacing and godet distance adjust respectively simultaneously, thus realize the sizing operation of hollow forging.This fixed diameter process, without the need to using sizing skew rolling mill, has saved production cost; Also solve traditional sizing skew rolling mill cannot carry out sizing defect to thick-walled seamless steel pipes simultaneously, only need the sizing plug being equipped with suitable diameter at the most, thus greatly save production cost, be conducive to the decline of product price, and then improve prospect for sales.
In fixed diameter process, godet is apart from being greater than roll distance all the time, and godet apart from and roll apart between the more traditional reducing process of difference in little, this is because in fixed diameter process, godet is apart from the supporting role no longer only played hollow forging, but also squeezing action is played to hollow forging perisporium, auxiliary roller determines the rule circle sizing of hollow forging circumference.Therefore, what be now arranged in the more traditional reducing process of power that hollow forging godet circumferentially bears wants large many, is also absolutely necessary for the sizing of hollow forging in fixed diameter process.
In fixed diameter process, the sizing plug in the present invention on two-roller skew-rolling machine can't extrude hollow forging, but due to hollow forging general longer, so still need sizing plug to carry out certain supporting role from hollow forging inside to it.If the spacing between sizing plug and hollow forging is too small, then sizing plug can extrude waste inside pipe wall in Sizing Process, thus reduces the wall thickness of hollow forging further, the sizing of the required wall thickness of interference; If spacing is excessive, then sizing plug cannot support hollow forging, thus makes hollow forging in Sizing Process because of reasons such as gravity to deform, the sizing of the required wall thickness of same interference.Therefore, the gap between the inwall of described rolling section and sizing plug is 30 ~ 50mm, and the gap also namely between the inwall of this press section place hollow forging and sizing plug is 30 ~ 50mm.
Because the wall thickness of seamless steel pipe is less, then utilize traditional sizing skew rolling mill, so in order to improve productivity effect, so the wall thickness of described thick-walled seamless steel pipes is at least 80mm (such as 90 ~ 150mm), also, only under such wall thickness, fixed diameter process of the present invention could realize the economic benefit of its best.
The invention has the beneficial effects as follows, solve traditional sizing skew rolling mill cannot carry out sizing defect to thick-walled seamless steel pipes, and save the expense being equipped with sizing skew rolling mill, only need the sizing plug being equipped with suitable diameter at the most, thus greatly save production cost, be conducive to the decline of product price, and then improve prospect for sales, and the seamless steel pipe after sizing have high, the straight degree of geometric accuracy well, the advantage such as flawless.
In order to overcome the deficiencies in the prior art, the invention provides a kind of use avoiding sizing skew rolling mill, only need utilize the rolling mill practice of two-roller skew-rolling machine and achievable sizing operation, particularly can be used for being rolled the seamless steel pipe of heavy wall, and the seamless steel pipe after rolling have high, the straight degree of geometric accuracy well, the rolling mill practice of the advantage such as flawless.
A rolling mill practice for thick-walled seamless steel pipes, comprises heating process, perforation process successively, subtracts wall operation and sizing operation, described in subtract wall operation and adopt two-roller skew-rolling machine to carry out, described sizing operation comprises:
1) the roller distance of the two-roller skew-rolling machine used when adjustment subtracts wall operation, makes roller apart from the 1.01-1.05 for fished pipe external diameter doubly; Adjust the godet distance of described two-roller skew-rolling machine, make godet apart from the 1.02-1.10 for described roller distance doubly;
2) plug that described two-roller skew-rolling machine uses when subtracting wall operation is replaced by sizing plug, the hollow forging obtained after subtracting wall operation is sheathed on sizing plug, under the effect of described roll and godet, carry out fixed diameter rolling and obtain thick-walled seamless steel pipes;
Position during fixed diameter rolling, hollow forging contacted with roll is rolling section, leaves gap all the time between the inwall of this rolling section and sizing plug.
In sizing operation in the present invention, first according to the external diameter of the internal diameter adjustment sizing plug of hollow forging, ensure that sizing plug and waste inside pipe wall leave gap all the time, sizing plug can be played a supporting role to hollow forging in Sizing Process, but can not play extruding to the wall thickness of hollow forging; Then only hollow forging need be sheathed on the sizing plug of two-roller skew-rolling machine, breaker roll roll spacing and godet distance adjust respectively simultaneously, thus realize the sizing operation of hollow forging.This fixed diameter process, without the need to using sizing skew rolling mill, has saved production cost; Also solve traditional sizing skew rolling mill cannot carry out sizing defect to thick-walled seamless steel pipes simultaneously, only need the sizing plug being equipped with suitable diameter at the most, thus 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 is apart from being greater than roll distance all the time, and godet apart from and roll apart between the more traditional reducing process of difference in little, this is because in fixed diameter process, godet apart from the supporting role no longer only played hollow forging, but also plays squeezing action to hollow forging perisporium, and auxiliary roller determines the rule circle sizing of hollow forging circumference.Therefore, what be now arranged in the more traditional reducing process of power that hollow forging godet circumferentially bears wants large many, is also absolutely necessary for the sizing of hollow forging in fixed diameter process.
In fixed diameter process, the sizing plug in the present invention on two-roller skew-rolling machine can't extrude hollow forging, but due to hollow forging general longer, so still need sizing plug to carry out certain supporting role from hollow forging inside to it.If the spacing between sizing plug and hollow forging is too small, then sizing plug can extrude waste inside pipe wall in Sizing Process, thus reduces the wall thickness of hollow forging further, the sizing of the required wall thickness of interference; If spacing is excessive, then sizing plug cannot support hollow forging, thus makes hollow forging in Sizing Process because of reasons such as gravity to deform, the sizing of the required wall thickness of same interference.Therefore, the gap between the inwall of described rolling section and sizing plug is 30 ~ 50mm, and the gap also namely between the inwall of this press section place hollow forging and sizing plug is 30 ~ 50mm.
Because the wall thickness of seamless steel pipe is less, then utilize traditional sizing skew rolling mill, so in order to improve productivity effect, so the wall thickness of described thick-walled seamless steel pipes is at least 80mm (such as 90 ~ 150mm), also, only under such wall thickness, fixed diameter process of the present invention could realize the economic benefit of its best.
In described sizing operation, the axis of roll and horizontal plane angle are roll off angle, and this roll off angle is 7-8 °, and the roll off angle of this scope is little to the ovality of steel pipe during hollow forging rolling sizing, and mill current is little.
In described sizing operation, the axis of roll and the angle of vertical plane are feed angle, and this feed angle is 6-7 °, and during rolling sizing to hollow forging of the feed angle of this scope, steel pipe is easily nipped.
The invention has the beneficial effects as follows: solve traditional sizing skew rolling mill cannot carry out sizing defect to thick-walled seamless steel pipes, and save the expense being equipped with sizing skew rolling mill, only need the sizing plug being equipped with suitable diameter at the most, thus greatly save production cost, be conducive to the decline of product price, and then raising prospect for sales, and the seamless steel pipe after sizing have high, the straight degree of geometric accuracy well, the advantage such as flawless.
Accompanying drawing explanation
Fig. 1 is the structural representation that traditional two-roller skew-rolling machine subtracts that in wall technique, godet, roll, hollow forging and plug coordinate.
Fig. 2 is the fragmentary sectional view that in traditional fixed diameter process, roll, hollow forging and plug coordinate.
Fig. 3 is the fragmentary sectional view that in embodiment of the present invention fixed diameter process, roll, hollow forging and plug coordinate.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 3, the present embodiment is realized by two-roller skew-rolling machine, two-roller skew-rolling machine comprises two symmetrical rolls 1, two symmetrical godet (not shown)s, and with the sizing plug 3 come directly towards, because two-roller skew-rolling machine is known technology, therefore eliminate the specific descriptions to two-roller skew-rolling machine, in order to avoid the description of these unnecessary details impact to technical solution of the present invention.
Embodiment 1 utilizes two-roller skew-rolling machine to carry out the fixed diameter process of thick-walled seamless steel pipes
1) if the external diameter that will obtain fished pipe is 610mm, then adjust roll 1 roll spacing of two-roller skew-rolling machine, make roll 1 roll spacing be the 616mm (610mm*1.01 doubly) of fished pipe external diameter;
The godet distance of adjustment two-roller skew-rolling machine, makes godet apart from the 628mm (616mm*1.02 doubly) for roll 1 roll spacing;
2) be sheathed on the sizing plug 3 of two-roller skew-rolling machine by hollow forging 4, under the effect of roll 1 and godet, carry out fixed diameter rolling and obtain thick-walled seamless steel pipes, the wall thickness of this thick-walled seamless steel pipes is 120mm;
Position during fixed diameter rolling, hollow forging 4 contacted with roll 1 is rolling section 41, leaves gap 2 all the time between the inwall of this rolling section 41 and sizing plug 3, and this gap 2 is 30mm.
Obtained thick-walled seamless steel pipes outside diameter tolerance is consistent with sizing outer diameter of steel pipes deviation.Statistics is as follows:
The rolling mill practice of embodiment 2 thick-walled seamless steel pipes
Comprise heating process, perforation process successively, subtract wall operation and sizing operation, subtract wall operation and adopt two-roller skew-rolling machine to carry out,
Sizing operation comprises:
1) if the external diameter that will obtain fished pipe is 660mm, then roll 1 roll spacing of two-roller skew-rolling machine that uses when subtracting wall operation of adjustment, makes roll 1 roll spacing be 1.01 times of fished pipe external diameter;
The godet distance of adjustment two-roller skew-rolling machine, makes godet distance be 1.02 times of roll 1 roll spacing;
2) plug that two-roller skew-rolling machine uses when subtracting wall operation is replaced by sizing plug 3, the hollow forging 4 obtained after subtracting wall operation is sheathed on sizing plug 3, under the effect of roll 1 and godet, carry out fixed diameter rolling and obtain thick-walled seamless steel pipes, the wall thickness of this thick-walled seamless steel pipes is 102mm;
Position during fixed diameter rolling, hollow forging 4 contacted with roll 1 is rolling section 41, leaves gap all the time between the inwall of this rolling section 41 and sizing plug 3, and this gap is 30mm.
Obtained thick-walled seamless steel pipes outside diameter tolerance is consistent with sizing outer diameter of steel pipes deviation.Statistics is as follows:
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. utilize two-roller skew-rolling machine to carry out a fixed diameter process for thick-walled seamless steel pipes, it is characterized in that, comprising:
1) adjust the roller distance of two-roller skew-rolling machine, make roller apart from the 1.01-1.05 for fished pipe external diameter doubly; The godet distance of adjustment two-roller skew-rolling machine, makes godet apart from the 1.02-1.10 for described roller distance doubly;
2) hollow forging is sheathed on the sizing plug of two-roller skew-rolling machine, under the effect of described roll and godet, carries out fixed diameter rolling and obtain thick-walled seamless steel pipes;
Position during fixed diameter rolling, hollow forging contacted with roll is rolling section, leaves gap all the time between the inwall of this rolling section and sizing plug.
2. the fixed diameter process utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes according to claim 1, is characterized in that, the gap between the inwall of described rolling section and sizing plug is 30 ~ 50mm.
3. the fixed diameter process utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes according to claim 2, it is characterized in that, the wall thickness of described thick-walled seamless steel pipes is at least 80mm.
4. a rolling mill practice for thick-walled seamless steel pipes, comprises heating process, perforation process successively, subtracts wall operation and sizing operation, it is characterized in that, described in subtract wall operation and adopt two-roller skew-rolling machine to carry out, described sizing operation comprises:
1) the roller distance of the two-roller skew-rolling machine used when adjustment subtracts wall operation, makes roller apart from the 1.01-1.05 for fished pipe external diameter doubly; Adjust the godet distance of described two-roller skew-rolling machine, make godet apart from the 1.02-1.10 for described roller distance doubly;
2) plug that described two-roller skew-rolling machine uses when subtracting wall operation is replaced by sizing plug, the hollow forging obtained after subtracting wall operation is sheathed on sizing plug, under the effect of described roll and godet, carry out fixed diameter rolling and obtain thick-walled seamless steel pipes;
Position during fixed diameter rolling, hollow forging contacted with roll is rolling section, leaves gap all the time between the inwall of this rolling section and sizing plug.
5. the rolling mill practice utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes according to claim 4, is characterized in that, the gap between the inwall of described rolling section and sizing plug is 30 ~ 50mm.
6. the rolling mill practice utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes according to claim 5, it is characterized in that, the wall thickness of described thick-walled seamless steel pipes is at least 80mm.
7. the rolling mill practice utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes according to claim 6, is characterized in that, in described sizing operation, the axis of roll and horizontal plane angle are roll off angle, and this roll off angle is 7-8 °.
8. the rolling mill practice utilizing two-roller skew-rolling machine to carry out thick-walled seamless steel pipes according to claim 7, is characterized in that, in described sizing operation, the axis of roll and the angle of vertical plane are feed angle, and this 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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| CN105234179A true CN105234179A (en) | 2016-01-13 |
| CN105234179B CN105234179B (en) | 2017-03-22 |
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| CN106378582A (en) * | 2016-09-07 | 2017-02-08 | 重庆科技学院 | Preparation method of GH4169 high-temperature alloy tube blank |
| CN106903169A (en) * | 2017-04-06 | 2017-06-30 | 北京京诚之星科技开发有限公司 | Mandrel rolling mill |
| CN107755430A (en) * | 2016-08-15 | 2018-03-06 | Sms集团有限公司 | Rolling equipment with the inclination milling train according to Assel technique |
| CN110076198A (en) * | 2019-04-30 | 2019-08-02 | 北京科技大学 | A kind of two roller oblique milling forming device of pole material and method |
| CN110252814A (en) * | 2019-03-18 | 2019-09-20 | 西北工业大学 | A kind of Mannesmann piercing method of titanium alloy solid bar stock |
| 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 |
| CN116550758A (en) * | 2023-07-06 | 2023-08-08 | 太原理工大学 | Efficient sizing adjustment skew rolling equipment and method for seamless metal corrugated composite pipe |
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