CN101450350A - Method and rolling mill to produce wireless steel pipes - Google Patents
Method and rolling mill to produce wireless steel pipes Download PDFInfo
- Publication number
- CN101450350A CN101450350A CNA2008101798140A CN200810179814A CN101450350A CN 101450350 A CN101450350 A CN 101450350A CN A2008101798140 A CNA2008101798140 A CN A2008101798140A CN 200810179814 A CN200810179814 A CN 200810179814A CN 101450350 A CN101450350 A CN 101450350A
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- CN
- China
- Prior art keywords
- rolling
- plug
- rolled piece
- milling train
- tool
- 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 56
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 8
- 239000010959 steel Substances 0.000 title claims abstract description 8
- 238000003801 milling Methods 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid 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
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
-
- 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
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Metal Extraction Processes (AREA)
Abstract
The present invention relates to a method and rolling mill to produce wireless steel pipes, in the continuous rolling process, one or a plurality of horizontal rolling mill stand or slant rolling mill stand and inner rolling tool (2) inserted in a rolling member in the rolling process arranged one by one, the inner rolling tool (2) is structured as a mandrel bar (2a) with a piercer (2b) arranged on the bar in a front side. The invention provides a method and a rolling mill capable of preventing, at least reducing eccentricity and un-round properties of rolled pipes. The piercer rotates in reverse direction (7) to rotation movement of the rolling member. The mandrel bar (2a) or the inner rolling tool (2) is configured with a drive device (5) rotating the mandrel bar or the inner rolling tool in reverse direction to rotation movement (7) of the rolling member in the rolling process.
Description
Technical field
The present invention relates to be used to make a kind of method and a kind of milling train of seamless steel pipe, wherein use one or more axial rolling machine frame or skew rolling mill frames that are provided with in succession and be inserted into inside rolling tool in the inside of rolled piece in the continuous operation of rolling in the operation of rolling, this inside rolling tool is configured to have the plug of the top that is arranged on its front end.
Background technology
Adopt tandem rolling method (continuous pipe milling method) to use tandem mill, be also referred to as the pipe tandem mill and make seamless pipe for example by DE-Z " Berg-und
Monatshefte 130 (1985), and Heft 7, Seiten 205 bis 211 " (mining and metallargist's monthly magazine 130 (1985), the 7th phase, the 205th page to the 211st page) known.In most cases use milling round steel as raw material, be at most the circular continuous casting billet of 350mm mainly as diameter, this circle continuous casting billet is heated to rolling temperature with the length of 5m at the most in rotary hearth furnace.Next at the hollow block that is configured on the perforation milling train of skew rolling mill frame solid slug be bored a hole into thin-walled usually.The hollow block that so makes is then to be rolled into pipe by inner rolling tool in tandem mill under identical temperature.Tandem mill in most cases is made of six to nine tight rolling-mill housing in succession, and the respectively mutual reverse rotation of these rolling-mill housing ground is provided with, and for example distinguishes half-twist.Roll speed is coordinated with each other according to cross section decrement (Querschnittsabnahme), thereby affacts on the rolled piece not having the pulling force or the upset force of being worth mentioning between the frame.
In tandem mill, begin before the operation of rolling, hollow block is by penetrating wherein plug as inner rolling tool together with the top, as for example known by DE 21 31 713 A1 according to a kind of Variant Design, the plug that is commonly referred to the entrance side of retainer by this area keeps or the mobile device shift position, is pushed in the tandem mill then.There, hollow block is clamped by roll, and is rolled on plug by the roll pass that diminishes gradually from the frame to the frame.In this case, have the top plug speed since bar rolling speed accelerate also more and more faster.Plug keeps by plug and mobile device is controlled during rolling together, follows the tracks of plug speed servo-actuated half control system or full control.
Still hollow block being rolled into a known problem that all exists under the situation of pipe under the situation of the oblique milling that is used for piece is bored a hole into hollow block be at the tandem mill of multimachine frame, no matter the plug that still constitutes by the hollow material of circle by the solid material of circle since the bigger power in part be out of shape.The deflection of the plug of Chu Xianing causes eccentricity value to become big along with the swing that is installed in the top on the plug in this case.Promptly the longitudinal axis that is eccentric in plug of the top on the axial end portion of plug also moves.The result causes circumferential wall thickness ununiformity hollow block and pipe even.
But this swing can be caused that not only wherein Ding Tou the longitudinal axis and rolled piece axle clamp promptly stretch at angle not parallelly by the deflection that is in the plug under the big axial compressive force.The off-centre of top also can be caused by following other different factor, and has determined eccentric degree, the thermograde on, the cross section inhomogeneous as material, the asymmetric power effect and the plug not straight or vibration of instrument.
Being used to so far reduces the solution of the degree of eccentricity and is devoted to control aforesaid influence size and keeps its negative effect as far as possible little.But so the degree of eccentricity of the minimum that realizes is in 3% to 5% the scope all the time, and is difficult to by high cost lower in the production period maintenance.
Summary of the invention
Therefore the objective of the invention is to, a kind of method and a kind of milling train are provided, utilize them can avoid the off-centre of aforesaid drawbacks, particularly perforated hollow block or pipe reliably, perhaps it is reduced to technical accessible degree to the major general.
Described purpose is achieved by method of the present invention, wherein makes the top carry out and rolled piece opposite the rotatablely moving of direction that rotatablely move.The present invention is based on following understanding,,, prevent the eccentric mechanism that produces according to the rotatablely moving of reverse off-centre of a kind of preferred design by the top promptly by the plug rotation opposite with the direction that rotatablely moves of rolled piece.The result produces the obvious raising to the seamless pipe quality of production, and correspondingly saves the milling train job costs.Because the eccentric negative effect that causes in other cases in the milling train work that on plug pipe is rolled can be eliminated in this way.
The present invention based on purpose be achieved by milling train of the present invention, wherein plug be equipped with make this plug during the operation of rolling with the rolled piece drive unit that direction rotates on the contrary that rotatablely moves, for example keep or other member of mobile device as the plug of entrance side.
For this reason, a kind of preferred design code of the present invention, plug is connected with the top prejudicially by adapter.Thus, between the roll on the top rolling in advance pipe part, plug carries out and the rolled piece opposite rotation of direction that rotatablely moves, as the reverse rotation of off-centre.
Propose according to the present invention, adapter is connected with plug and top bolt, wherein plug with come directly towards the thread head that staggers mutually with an offset that has toward each other.This can adopt simple mode to realize by following measure, and promptly the longitudinal axis or the center line of the longitudinal axis of plug thread head or center line and top thread head in height stagger slightly mutually, for example several 0.1mm or some millimeters.
According to a kind of design code, thread head is provided with external screw thread, and the link of adapter then is provided with internal thread.Therefore adapter only need be screwed on the plug, only need be screwed in another idle link of adapter than the short a lot of top of plug.Need explanation relatively, offset alternatively also can form in the link of adapter, that is to say, the internal thread on the link of box-like or jar shape staggers mutually.
If plug another kind of design structure according to the present invention has the cross-sectional profile that improves the axial resistance square, then can help eliminating the eccentric amount of influence negatively.Because by to the selection of cross-sectional profile, the moment of resistance of raising can help to overcome the deflection of plug, and therefore can overcome the top and swing by disadvantageous off-centre.
With regard to the plug of inner colded tubulose, this plug can advantageously be provided with inner moulding section, for example intersects profile or interior hexagonal profile.Reduce possible deflection or bending that plug occurs owing to axial compressive force thus, but keep simultaneously plug for the needed thin wall thickness of effective cooling.
Description of drawings
Further feature of the present invention and details can be obtained by claim and following explanation to the embodiments of the invention shown in the accompanying drawing.Shown in the figure:
Fig. 1 is as the roll of the single-piece of skew rolling mill frame or the axial rolling machine frame sectional elevation to, hollow bloom and driven plug;
Fig. 2 is vertical view of inner rolling tool, and wherein adapter makes plug be connected prejudicially with the top;
Fig. 3 is for being configured to intersect the sectional elevation of plug of profile by inner moulding; With
Fig. 4 illustrates the plug that is configured to the hexagonal profile by inner moulding.
The specific embodiment
In order to make seamless steel pipe, as shown in fig. 1, be rolled on the inside rolling tool 2 in rolled piece or hollow bloom 1 inside that is inserted into hollow bloom 1 between roll 3,4.The inside rolling tool 2 that is made of plug 2a and the top 2b that is arranged on the front end of this plug has circular cross section, wherein the roll 3,4 that the excircle of hollow bloom 1 is rolled is configured with corresponding profile, that is to say that their radial section is a circular arc.Therefore produce the roll seam during correspondingly with respect to inner rolling tool 2 combined pressures at roll 3,4, this roll seam limit desirable when being rolled into pipe the toroidal of double team hollow bloom 1.
The desirable desirable circularity with seamless pipe hollow bloom 1 or that remain to be made among Fig. 1 is achieved by following measure with the annular cross section of consistent wall thickness, promptly by drive unit 5 make inner rolling tool 2, promptly come directly towards 2b and plug 2a uses rotatablely moving shown in the arrow 7 forcibly, this rotatablely moves opposite with the direction that rotatablely moves with the rolled piece inevitable hollow bloom 1 or pipe when rolling shown in the arrow 6.
As shown in Figure 2, if inner rolling tool 2 is configured with the top 2b on the axial forward end that is arranged on plug 2a prejudicially, then carry out and the rotatablely move 7a that rotatablely moves of the opposite off-centre of 6 directions of rolled piece this top.Plug 2a is connected with top 2b by adapter 8 for this reason, and bolt connects more precisely, wherein plug 2a with come directly towards 2b and have toward each other the thread head 10a or the 10b that stagger mutually with offset 9.Therefore the center line of plug 2a or longitudinal axis 11a stretch with the center line or the longitudinal axis 11b of offset 9 with top 2b with staggering.Cross section is link 12a or the 12b that columniform adapter 8 has jar shape, and these links are configured with internal thread and are screwed on the external screw thread of thread head 10a or 10b.Termination screw connection point 13a, 13b illustrate with arrow.
The plug of inner rolling tool can be configured with the cross-sectional profile that improves the axial resistance square.It can be the shell face or the lateral surface that prevent or reduce to a great extent deflection of the plug of solid material.With regard to the plug 102a or 102b of the tubulose shown in Fig. 3 and 4, these plugs are configured with inner profile 14, for intersecting profile 14a, and are interior hexagonal profile 14b according to Fig. 4 according to Fig. 3.
Reference numerals list
1 hollow bloom
2 inner rolling tools
The 2a plug
The 2b top
3 rolls
4 rolls
5 drive units
The arrow that 6 rolled pieces rotatablely move (hollow bloom/pipe)
7 rotatablely move (plugs inner rolling tool or that have the top)
Rotatablely move (top) of 7a off-centre
8 adapters
9 offsets
The 10a thread head
The 10b thread head
11a center line/longitudinal axis (plug)
11b center line/longitudinal axis (top)
12a link (adapter)
12b link (adapter)
13a termination-screw connection point (arrow)
13b termination-screw connection point (arrow)
14 inner profiles
14a intersects profile
Hexagonal profile in the 14b
The plug (intersection profile) of the inner moulding of 102a
The plug (hexagonal profile) of the inner moulding of 102b
Claims (9)
1. method that is used to make seamless steel pipe, wherein in the continuous operation of rolling, use one or more axial rolling machine frame or skew rolling mill frames that are provided with in succession and in the operation of rolling, be inserted into inside rolling tool (2) in the inside of rolled piece (1), this inside rolling tool is configured to have the plug (2a) of the top (2b) that is arranged on its front end, it is characterized in that, make described top (2b) carry out rotatablely moving with rolled piece (6) direction opposite rotatablely move (7; 7a).
2. the method for claim 1 is characterized in that, makes described plug (2a) and described rolled piece (6) direction that rotatablely moves rotate on the contrary.
3. method as claimed in claim 1 or 2 is characterized in that, makes described top (2b) carry out rotatablely move (7a) of reverse off-centre.
4. milling train that is used to make seamless steel pipe, wherein in the continuous operation of rolling, use one or more axial rolling machine frame or skew rolling mill frames that are provided with in succession and in the operation of rolling, be inserted into inside rolling tool (2) in the inside of rolled piece (1), this inside rolling tool is configured to have the plug (2a) of the top (2b) that is arranged on its front end, especially for implementing the method for claim 1, it is characterized in that described plug (2a) is equipped with and makes the drive unit (5) that this plug rotatablely moves with rolled piece during the operation of rolling (6) direction rotates on the contrary.
5. milling train as claimed in claim 4 is characterized in that, described plug (2a) is connected with described top (2b) prejudicially by adapter (8).
6. milling train as claimed in claim 5, it is characterized in that, described adapter (8) is connected with described top (2b) bolt with described plug (2a), and wherein said plug (2a) and described top (2b) have the thread head (10a that staggers mutually with an offset (9) toward each other; 10b).
7. milling train as claimed in claim 6 is characterized in that, described thread head (10a; 10b) be provided with external screw thread, and the link of described adapter (8) (12a; 12b) then be provided with internal thread.
8. as claim 4 or 5 described milling trains, it is characterized in that described plug (2a; 102a 102b) is configured with the cross-sectional profile that improves the axial resistance square.
9. milling train as claimed in claim 8 is characterized in that, (102a 102b) is configured with inner moulding section (14 to the plug of tubulose; 14a, 14b).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007059320.3 | 2007-12-07 | ||
| DE102007059320 | 2007-12-07 | ||
| DE102008056988.7 | 2008-11-12 | ||
| DE102008056988A DE102008056988A1 (en) | 2007-12-07 | 2008-11-12 | Seamless steel pipe producing method for rolling mill, involves providing inner tool in interior of pipe blank, where rotation movement opposite to rotary movement of pipe blank is imposed to piercer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101450350A true CN101450350A (en) | 2009-06-10 |
| CN101450350B CN101450350B (en) | 2010-09-01 |
Family
ID=40621433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101798140A Expired - Fee Related CN101450350B (en) | 2007-12-07 | 2008-12-05 | Method and rolling mill to produce wireless steel pipes |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN101450350B (en) |
| AT (1) | ATE548134T1 (en) |
| DE (1) | DE102008056988A1 (en) |
| RU (1) | RU2401708C2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011010646A1 (en) | 2010-03-02 | 2011-09-08 | Sms Meer Gmbh | Hot tool and method for its production |
| DE102012022014B3 (en) * | 2012-11-03 | 2013-12-12 | Hans Joachim Pehle | Method for producing seamless steel tubes with low eccentricity |
| DE102014016502A1 (en) | 2014-11-07 | 2016-05-12 | Hua Guo | Hot forming tool with reinforced oxide protective layer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3735622A (en) | 1970-06-25 | 1973-05-29 | C Montagna | Tube rolling mills |
-
2008
- 2008-11-12 DE DE102008056988A patent/DE102008056988A1/en not_active Withdrawn
- 2008-11-28 AT AT08020693T patent/ATE548134T1/en active
- 2008-12-05 CN CN2008101798140A patent/CN101450350B/en not_active Expired - Fee Related
- 2008-12-05 RU RU2008148091/02A patent/RU2401708C2/en active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101450350B (en) | 2010-09-01 |
| DE102008056988A1 (en) | 2009-06-10 |
| RU2401708C2 (en) | 2010-10-20 |
| RU2008148091A (en) | 2010-06-10 |
| ATE548134T1 (en) | 2012-03-15 |
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| 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 |
Granted publication date: 20100901 |
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| CF01 | Termination of patent right due to non-payment of annual fee |