CN1575877A - Rolling mill for the fabrication of seamless tubes - Google Patents
Rolling mill for the fabrication of seamless tubes Download PDFInfo
- Publication number
- CN1575877A CN1575877A CNA2004100545457A CN200410054545A CN1575877A CN 1575877 A CN1575877 A CN 1575877A CN A2004100545457 A CNA2004100545457 A CN A2004100545457A CN 200410054545 A CN200410054545 A CN 200410054545A CN 1575877 A CN1575877 A CN 1575877A
- Authority
- CN
- China
- Prior art keywords
- pipe
- roll
- cone angle
- milling train
- axial end
- 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.)
- Granted
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000003801 milling Methods 0.000 claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 230000008878 coupling Effects 0.000 claims description 14
- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 238000005242 forging Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 238000009785 tube rolling Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
-
- 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
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
-
- 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
- B21B27/021—Rolls for sheets or strips
- B21B2027/022—Rolls having tapered ends
Abstract
The invention relates to a mill for manufacturing seamless pipes, in particular to the seamless steel pipes, which comprises a plurality of milling rollers and a mandrel-shaped internal tool; wherein, the milling rollers are used for rolling the peripheral surface of pipes or pipe blanks; the mandrel-shaped internal tool is coaxially arranged with the pipes or pipe blanks; a deformation area is defined between the milling roller and the internal tool; the milling roller and the internal tool are suitable for orderly piercing the pipe blanks and elongating the pipes; in order to improve the piercing and elongating operation, at least one part of the milling rollers is arranged in two axial terminals and used for gripping and conveying pipes and pipe blanks; a cylindrical compression band is arranged between the two parts of the milling rollers arranged in the axial terminals; a pipe blank piercing area and a round bar part adjacent to the piercing area and matched with the cylindrical compression band to elongate the pipes are arranged on the internal tool in the axial terminal; the arrangement of the parts for gripping and conveying and the cylindrical compression band enables pipe piercing and elongation when the axes of the milling rollers are arranged in parallel with the axes of the pipes or the pipe blanks.
Description
Technical field
The present invention relates to seamless-tube rolling mill, especially slitless tube mill, this milling train has roll and plug shape in-house tool of the outer peripheral face of a plurality of rolling pipes or pipe, this in-house tool and pipe or pipe coaxial line ground are provided with, here, limit the deformed area between these rolls and in-house tool, described roll and in-house tool are applicable to bores a hole pipe successively and extends pipe.
Background technology
The manufacturing of seamless steel pipe can be finished on skew rolling mill, and in skew rolling mill, process divides two different operations to carry out.In first operation, steel billet is admitted in the milling train and is so bored a hole in the roll back of nipping, and promptly steel billet is rolled into hollow forging being on the in-house tool of push rod form free to rotate.Extend (rolling length) in second operation, promptly hollow forging is rolled into required pipe.
Rolling execution is for example finished in three-roll cross rolling mill.About relevant therewith prior art, with reference to DE-PS259623 and DE-PS259625.Described common skew rolling mill in these prior aries, it comes work with common roll pass and in-house tool.But, can't make the thin-walled hollow forging with this skew rolling mill.Therefore, the rolling method is less than the A Saier tube rolling method in modern times.
If process is carried out as described above in two steps, then need be according to the A Saier milling train very high multimachine frame skew rolling mill arranged in form of cost of investment, that be used for the extension of thin-walled hollow forging.
Therefore, for example known from DE3717698C2 that the perforation of pipe and extension are finished in a rolling operation of associating.At this moment, in first operation, bore a hole, here, the axis positioned opposite like this of roll axis and pipe to be bored a hole, promptly they are each other at an angle.When extension subsequently, roll axis and tube axis are parallel to each other.
In addition, in these known methods, proved, for process reliably and cheaply, must the very special running parameter of regulation, extend operation so that can carry out the association type perforation of seamless pipe technically and economically very effectively.
The fact shows that also the correct structural scheme of finding out correct processing conditions and milling train is so that can be by the thin-walled hollow forging of rolling operation is extended in perforation and even the manufacturing of heavy wall hollow forging realizes bigger tubing production range by uniting, and this is remarkable.
Especially make with regard to the small lot seamless pipe, situation is all the more so.
US2197098 discloses the special tectonic of perforation push rod and especially at the material of this employing.
Summary of the invention
Task of the present invention is the milling train that proposes the above-mentioned type, utilizes this milling train, can operation reliably and economically carry out the pipe perforation extension operation of uniting.
According to the present invention, so finish this task, be that these rolls respectively have at least one part on two axial end portions, this part is configured for nips and Delivery tube or pipe, and between these two parts that are arranged in the axial end portion of roll, be provided with a cylindrical compression band, this in-house tool in an axial end portion, have one that join with this punch block and be used for this cylindrical compression band cooperating to the punch block of pipe perforation and one so that the pole part of extension pipe, here, this is nipped and part and this cylindrical compression band positioned opposite like this of Delivery tube, i.e. the perforation of pipe or pipe and extend and can both finish under roll axis is parallel to the situation of tube axis or pipe axis.
At least one part in two parts in the roll axial end portion advantageously coning.The cone angle of this part is preferably 1 degree-5 degree at this moment.Can also stipulate, in an axial end portion of roll, with this part coning mutually ground connection be provided with another part coning towards another axial end portion, described another conical portion can have the cone angle greater than adjacent part coning here.
When the axial end portion of roll is formed at when being positioned at radial extremity in the cross section, pipe is dished out from roll and is obtained optimization.
About in-house tool, fact proved that following measure is favourable, promptly with the instrument punch block that is used to bore a hole mutually ground connection be provided with a connecting portion coning.The cone angle of this connecting portion is preferably 2 degree-15 degree at this moment.In addition, stipulated advantageously that connecting portion coning is made of two subregions, the cone angle that they are had nothing in common with each other.If second cone angle of one of them connecting portion has then obtained very favorable deformation condition less than first cone angle of another connecting portion.
If according to an improvement project ground regulation, the cone angle of one of them connecting portion of this in-house tool has then obtained best deformed area greater than the cone angle of described another part of this roll between roll and in-house tool.
Form of implementation according to milling train set forth above and especially used roll and in-house tool, can unite perforation very effectively and extend operation, thereby guaranteed perfect technically and reproducible process, in addition, can implement this process at low cost.
Description of drawings
One embodiment of the present of invention shown in the drawings, wherein:
Fig. 1 schematically illustrates the in-house tool when pipe is bored a hole and the position of roll.
The hollow forging that Fig. 2 is illustrated under the mating reaction of roll and in-house tool extends.
The specific embodiment
In these figure, show three uniformly dispersings at a pipe 1 or manage oblique milling roller 2 on the outer perimeter of 1 base 3, these oblique milling rollers also roll subsequently with in-house tool 4 cooperating ground perforation pipe 3 and grow the hollow forging (Fig. 2) that (extension) preprocessing goes out.
In other words, these rolls 2 constitute the roll of three-roll cross rolling mill, and they cooperate the perforation of uniting of finishing pipe 1 or pipe 3 to extend operation with in-house tool 4.
Special pass technical solution of needs is extended in the perforation of uniting by roll 2, and it should satisfy this two requirements that operation is promptly bored a hole and extended simultaneously.As described below, these rolls 2 and in-house tool 4 all have a special pass design, and such pass design allows the rolling thin-wall hollow forging and makes the thin-walled hollow billet according to reversible operational procedure subsequently.
Therefore, roll 2 and in-house tool 4 all have special shape, so that rolling above-mentioned thin-walled hollow forging.
In the perforation operation shown in Fig. 1 signal, pipe 3 is pushed in the milling train and after roll 2 is nipped and is rolled into hollow forging 4 by the in-house tool 4 that freely rotates.
For the pipe of nipping, roll 2 is in 5 li parts 7 that have coning of its left side axial end portion as shown in Figure 1, cone angle
1Be about 5 degree, preferably 3 degree-7 degree.
Perforated tube is that nipping of hollow forging is to utilize the conical portion 2 of 6 li of the right side axial end portions that is arranged on roll 2 of roll 2 to finish, here, and cone angle
3Be about 2 degree, preferably 1 degree-3 degree.
Be adjacent to roll 2 parts 8, on the direction of the axial end portion 5 of roll 2, be connected to another conical portion 12.Here, cone angle
2Bigger and be about 7 degree, 5 degree-9 degree preferably.
Between described another conical portion 12 of roll 2 and conical portion 7, be provided with a cylindrical compression band 13.
On two axial ends 14,15 of roll 2 petiolarea 16,17 is arranged, these petiolareas have radially shaped portion (seeing radius R) in cross section, so that the best of assurance pipe 1 enters and dishes out.
In-house tool 4 has punch block 10 for 9 li at its axial end portion, can pipe be processed into hollow forging by this punch block and according to traditional approach.Punch block 10 has a radial variations part (seeing radius R) in the longitudinal section.
After perforation, in a reverse step, then extend (rolling length), for this reason, in-house tool 4 has the pole part 11 of a long extension.Figure 2 illustrates roll 2 and pole part 11 cooperatings, can see that here prefabricated pipe 1 (hollow forging) is rolled into finished product seamless pipe 1.
Realize by a coupling part 18,19 to the transition region of pole part 11 punch block 10 of instrument 4 internally.As shown in Figure 1, this coupling part is made up of two subregions 18,19, and wherein, these two subregions 18,19 respectively coning.Cone angle beta
1Or β
2In Fig. 1, marked, here can see, the cone angle beta of the coupling part 18 of close punch block 10
1Be greater than cone angle beta near the coupling part 19 of pole part 1
2β
1Value be 13 the degree, preferably 11 the degree-15 the degree, β
2Value be 4 the degree, preferably 2 the degree-6 the degree.
As mentioned above, when making seamless pipe 1, at least in first operation promptly in perforation by nip blank (pipe 3) and be rolled into hollow forging of roll 2 by the in-house tool 4 that can freely rotate.Rolled piece does not contact end 16 in running.The cone angle of part 7
1Be to design like this, promptly guaranteed nipping of rolled piece on the one hand, guaranteed to overcome axial plug resistance on the other hand.
In addition, in second operation, promptly in extension, should avoid rotation that rolled piece causes because of broadening or triangularization in the milling train outlet or unnecessary load.
The trend of cylindrical compression band 13 is parallel to roll axis.Another part 12 and cone angle thereof
2So determine, promptly, carry out enlarged-diameter when can reduce the rolled piece wall thickness at the same time, so, obviously suppress or alleviated the end trigonometric ratio that depending on of thin-walled hollow forging process operation in first operation (perforation) lining.
Roll 2 parts 8 coning.In first operation (perforation), this part and in-house tool 4 one are used from waste thickness of pipe wall are become evenly, and in second operation (extension), this part is used to the rolled piece of nipping.Cone angle
3So select, promptly can satisfy this two conditions.
In-house tool 4 comprises above-mentioned three parts, and promptly punch block 10 is used for most of task that pipe is bored a hole and shouldered wall thickness reduction.It is radially constructed or becomes shaped form.Coupling part 18,19 coning, begins the attenuate wall thickness so that obtain nominal wall thickness here in coupling part 18, make the hollow forging enlarged-diameter simultaneously.Cone angle beta
1Correspondingly greater than cone angle beta
2In coupling part 19, the wall thickness of pipe 1 is homogenized.
Extension is to finish on a rolling direction opposite with perforation.
In first operation (perforation) afterwards, these rolls 2 enter the station that is used for second operation (extension).Simultaneously, in-house tool 4 moves into required axial location and lubricated.When rolling, in-house tool 4 is controllably along rolling direction or move in contrast.
In order to extend, rolled piece is nipped in roll 2 parts 8 zones.Here, cone angle
3Be chosen such that and promptly satisfy bite condition.The task of another part 12 of roll 2 is to cooperate with in-house tool 4, so that the rolled piece wall thickness is reduced to nominal wall thickness.This part is short to and can stops the diameter of rolled piece excessively to increase.
The trend of the cylindrical compression band 13 of roll 2 is parallel to roll line, so that obtain the homogenising of wall thickness.The adjacent part 7 of roll 2 has cone angle
1The deformed area should increase on the rolled piece Way out in this zone fast, so that can and prevent rotation with the rolled piece full circle.
Although in this part, will realize nipping cone angle in first operation (perforation) lining
1Should not select too much.Therefore, roll 2 ends 16 are connected on the back, and are that it radially forms and deviate from rolled piece fast.
In thin-walled hollow forging rolling, in the hollow forging end regions, must produce the wall thicker, so that reduce end trigonometric ratio by processing operation decision than central portion.For this reason, in the rolled piece end regions, roll gap is returning nominal roll gap and is departing from nominal roll gap (so-called close soon fast point-score, see DE19724233A1) during in rolling fast end after the rolling beginning.
Stipulate in order to make operation of rolling optimization, between first operation (perforation) and second operation (extension), diverge the quick adjustment of angle (angle between roll axis and the roll line), so that enlarge the range of work.So, just can make thinner hollow forging.
By described embodiment, unite the perforation skew rolling mill and just can not only produce the thicker pipe of wall, and can realize and the modern the same range of work of A Saier milling train.The advantage that obtains thus is, compares with the A Saier milling train in modern times, can realize lower cost of investment.In addition, can under less year tonnage situation, obtain lower production cost.
The Reference numeral list
The 1-pipe; The 2-roll; The 3-pipe; The 4-in-house tool; The axial end portion of 5-roll; The 6-roll Axial end portion; 7-roll part; 8-roll part; The axial end portion of 9-in-house tool; In the 10-The punch block of section's instrument; 11-pole part; Another part of 12-roll; The cylinder of 13-roll Shape compression band; The axial end of 14-roll; The axial end of 15-roll; The end of 16-roll; 17-The end of roll; 18, the coupling part of 19-in-house tool; α1、α
2、α
2-cone angle; β1、
β
2-cone angle; The R-radius;
Claims (11)
1, a kind of milling train of manufacturing seamless pipe (1) and especially seamless steel pipe, this milling train comprises: a plurality of rolls (2), the rolling outer peripheral face that should manage (1) or pipe (1) base (3) of these rolls; A plug shape in-house tool (4), it and this pipe (1) or pipe (3) coaxial line ground are arranged; Wherein, between these rolls (2) and this in-house tool (4), limit a deformed area, these rolls (2) and this in-house tool (4) are applicable to bores a hole this pipe (3) according to priority and extends this pipe (1), it is characterized in that, these rolls (2) are at two axial end portions (5,6) respectively there is at least one part (7 lining, 8), this part is configured for nips and carries this pipe (1) or this pipe (3), these two at roll (2) are arranged in axial end portion (5,6) part (7 of lining, 8) be provided with a cylindrical compression band (13) between, this in-house tool (4) have in an axial end portion (9) lining a punch block (10) that is used for pipe (3) perforation and one adjacent with this punch block (10) and be used for this cylindrical compression band (13) cooperating so that the pole that extends this pipe (1) partly (11), wherein, these are used to nip and the part of carrying and this cylindrical compression band (13) positioned opposite like this, the i.e. not only perforation of this pipe (3), and the extension of this pipe (1) realizes in the time of can both arranging on the axis ground that roll (2) axis is parallel to pipe (1) or pipe (3).
2, milling train as claimed in claim 1 is characterized in that, at least one in these parts (7,8) in the axial end portion (5,6) of roll (2) coning.
3, milling train as claimed in claim 2 is characterized in that, the cone angle (α of this part (7,8)
1, α
2) be 1 degree-5 degree.
4, as claim 2 or 3 described milling trains, it is characterized in that, in an axial end portion (6) lining of roll (2), on the direction of another axial end portion (5) with this conical portion (8) mutually ground connection be connected to another conical portion (12).
5, milling train as claimed in claim 4 is characterized in that, described another conical portion (12) has a cone angle (α greater than adjacent conical portion (8)
2).
As the described milling train of one of claim 1-5, it is characterized in that 6, these axial ends (14,15) of roll (2) are formed in the cross section shape of end (16,17) radially.
7, as the described milling train of one of claim 1-6, it is characterized in that, with the punch block that is used to bore a hole (10) of this in-house tool (4) mutually ground connection be provided with a coupling part (18,19) coning.
8, milling train as claimed in claim 7 is characterized in that, the cone angle (β of this coupling part (18,19)
1, β
2) be 2 degree-15 degree.
As claim 7 or 8 described milling trains, it is characterized in that 9, this taper shape coupling part (18,19) is made of two subregions, they have different cone angle (β respectively
1, β
2).
10, milling train as claimed in claim 9 is characterized in that, the second cone angle (β of one of them coupling part (19)
2) less than the first cone angle (β of another coupling part (18)
1).
11, milling train as claimed in claim 10 is characterized in that, the cone angle (β of one of them coupling part (18) of this in-house tool (4)
1) greater than the cone angle (α of described another part (12) of these rolls (2)
2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10334011.4 | 2003-07-25 | ||
| DE10334011A DE10334011B3 (en) | 2003-07-25 | 2003-07-25 | Rolling mill forming seamless steel tube, includes roller end sections to grip and carry the tube or its blank, and inner tool with blank-penetrating section at its end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1575877A true CN1575877A (en) | 2005-02-09 |
| CN100344388C CN100344388C (en) | 2007-10-24 |
Family
ID=32695269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100545457A Expired - Fee Related CN100344388C (en) | 2003-07-25 | 2004-07-23 | Rolling mill for the fabrication of seamless tubes |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1500441B1 (en) |
| CN (1) | CN100344388C (en) |
| AT (1) | ATE325665T1 (en) |
| DE (2) | DE10334011B3 (en) |
| ES (1) | ES2263093T3 (en) |
| PL (1) | PL1500441T3 (en) |
| PT (1) | PT1500441E (en) |
| RU (1) | RU2270068C1 (en) |
| SI (1) | SI1500441T1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189114A (en) * | 2010-02-26 | 2011-09-21 | 科克斯技术有限及两合公司 | Roll stand |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107999540A (en) * | 2017-08-09 | 2018-05-08 | 鑫鹏源智能装备集团有限公司 | A kind of spy's heavy wall piercer roll |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE260425C (en) * | ||||
| DE259623C (en) * | ||||
| US2197098A (en) * | 1936-12-07 | 1940-04-16 | Nat Tube Co | Mandrel |
| GB2086283A (en) * | 1980-10-29 | 1982-05-12 | Metcalfe John | Tube-forming process |
| DE3622678A1 (en) * | 1985-07-12 | 1987-01-15 | Kocks Technik | METHOD AND DEVICE FOR CROSS-ROLLING SEAMLESS TUBE LOUPES |
| CN85106452B (en) * | 1985-08-28 | 1987-04-08 | 高建民 | Machine for rolling seamless pipes |
| DE3717698A1 (en) * | 1986-06-25 | 1988-01-14 | Kocks Technik | METHOD AND SYSTEM FOR PRODUCING SEAMLESS TUBES |
| US4798071A (en) * | 1986-06-25 | 1989-01-17 | Kocks Technik Gmbh & Co. | Seamless tube production |
| GB8816390D0 (en) * | 1988-07-09 | 1988-08-17 | Metcalf J | Rolling mill & method |
| DE19724233C2 (en) * | 1997-06-03 | 2003-10-16 | Sms Demag Ag | Process for avoiding or reducing trumpet-shaped widenings at the pipe end when cross-rolling thin-walled pipes and device for carrying out the process |
-
2003
- 2003-07-25 DE DE10334011A patent/DE10334011B3/en not_active Expired - Fee Related
-
2004
- 2004-07-12 PT PT04016328T patent/PT1500441E/en unknown
- 2004-07-12 EP EP04016328A patent/EP1500441B1/en not_active Not-in-force
- 2004-07-12 ES ES04016328T patent/ES2263093T3/en active Active
- 2004-07-12 SI SI200430043T patent/SI1500441T1/en unknown
- 2004-07-12 PL PL04016328T patent/PL1500441T3/en unknown
- 2004-07-12 AT AT04016328T patent/ATE325665T1/en active
- 2004-07-12 DE DE502004000529T patent/DE502004000529D1/en active Active
- 2004-07-23 CN CNB2004100545457A patent/CN100344388C/en not_active Expired - Fee Related
- 2004-07-23 RU RU2004122775/02A patent/RU2270068C1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189114A (en) * | 2010-02-26 | 2011-09-21 | 科克斯技术有限及两合公司 | Roll stand |
Also Published As
| Publication number | Publication date |
|---|---|
| PT1500441E (en) | 2006-08-31 |
| PL1500441T3 (en) | 2006-08-31 |
| DE10334011B3 (en) | 2004-08-12 |
| RU2270068C1 (en) | 2006-02-20 |
| CN100344388C (en) | 2007-10-24 |
| EP1500441B1 (en) | 2006-05-10 |
| SI1500441T1 (en) | 2006-10-31 |
| DE502004000529D1 (en) | 2006-06-14 |
| ES2263093T3 (en) | 2006-12-01 |
| ATE325665T1 (en) | 2006-06-15 |
| EP1500441A1 (en) | 2005-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1814679B1 (en) | Method for production of a seamless hot-finished steel tube | |
| CN104028607B (en) | A kind ofly improve the processing method that spinning subtracts thick pipe finished quality | |
| US8141405B2 (en) | Method for producing ultra thin wall metallic tube with cold working process | |
| CN101767165A (en) | Tube type flat belt pulley forming method | |
| US20040050133A1 (en) | Method of forming cold diametrally reducing roll for metal pipe and metal pipe formed by the method | |
| CN101579702B (en) | New technique for producing high alloy steel high-end pipe by adopting cross rolling elongation technology | |
| CN100344388C (en) | Rolling mill for the fabrication of seamless tubes | |
| RU2357815C1 (en) | Procedure of extension rolling at mill for rolling seamless tubes on mandrel | |
| US4173876A (en) | Method of producing metal tubing | |
| RU2401708C2 (en) | Method and rolling mill to produce seamless steel tubes | |
| RU2006140948A (en) | METHOD FOR PRODUCING SEAMLESS HOT-ROLLED PIPES | |
| EP2067542B1 (en) | Method and rolling mill to produce wireless steel pipes | |
| JP4259854B2 (en) | Extrusion method for uneven wall metal pipe and die for processing the same | |
| JP2003136131A (en) | Method for manufacturing hollow member provided with solid-core portion in end side | |
| CN217095005U (en) | Periodic roll and roll device | |
| RU2703929C1 (en) | Method of sleeve rolling into pipe | |
| SU1424888A1 (en) | Process tool for screw rolling of tubes | |
| RU2799823C1 (en) | Method for manufacturing steel complex-shaped shells | |
| RU2773967C1 (en) | Screw fitting method | |
| CN107243583B (en) | A kind of continuous variation ellipse section roll milling apparatus and blank-making method | |
| RU2723494C1 (en) | Method of rolling hollow billet on mandrel in three-shaft helical rolling mill and working roll for implementation thereof | |
| KR102315642B1 (en) | Method for mamufacturing tube having many-sided shape using cold rolling of pilger mill | |
| RU2489220C1 (en) | Method of helical piercing of cast billet | |
| JPH105820A (en) | Manufacture of seamless metallic tube | |
| DE19725314C1 (en) | Skew-rolling mill for elongation of seamless hollow blank heated to forming temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071024 Termination date: 20190723 |