CN101396693A - Piercer - Google Patents
Piercer Download PDFInfo
- Publication number
- CN101396693A CN101396693A CNA2008101497548A CN200810149754A CN101396693A CN 101396693 A CN101396693 A CN 101396693A CN A2008101497548 A CNA2008101497548 A CN A2008101497548A CN 200810149754 A CN200810149754 A CN 200810149754A CN 101396693 A CN101396693 A CN 101396693A
- Authority
- CN
- China
- Prior art keywords
- piercer
- mandrel stem
- plug
- recess
- guide section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 23
- 239000002826 coolant Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000003082 abrasive agent Substances 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 230000008676 import Effects 0.000 claims 1
- 238000003801 milling Methods 0.000 description 12
- 238000001816 cooling Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Images
Classifications
-
- 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
Abstract
The present invention relates to a perforated core rod (1) which is used for rolling a hollow blank received on perforated core rod (1), wherein the perforated core rod (1) is provided with a core rod lever (2) which comprises a core rod (4) that is set in an axial end part (3) of the core rod lever (2). The invention prescribes that the core rod (4) is movably installed relative to the core rod lever (2) long a radial direction (R) for reducing the thickness error of wall in producing the hollow blank or tube blank.
Description
Technical field
The present invention relates to a kind of rolling piercer that is received in the hollow blank on the piercer that is used for, wherein, piercer has a mandrel stem that has a plug that is provided with on the axial end portion of mandrel stem.
Background technology
Usually with the raw material of rolling round steel, mainly be as the round bar foundry goods that is 200 mm dias to the maximum as the production seamless steel pipe.This foundry goods is heated to about 1280 ℃ rolling temperature with the length up to 5 meters in rotary furnace.After removing iron scale, high-pressure hydraulic in a perforation milling train, solid blank is bored a hole into a kind of hollow blank of thin-walled.The machine of normally oblique milling being worn in this case is as the perforation milling train, wherein, rolls in the seam at one hollow blank is rolled.This roll gap is by some rolls, preferably is provided with one heart-is constituted by the excircle of three rolls-their rolling hollow blanks-and the interior instrument of a plug shape-it and hollow blank.In this case for tilt angle between 10 ° and 12 ° of the axle that reaches these rolls of enough disposal abilities and rolled parts.
Then the hollow blank of making in the milling train in perforation with identical temperature in continuous-rolling by also being that a piercer is rolled into pipe.Wherein, stretch reaches four length always, that is to say that the cross section is reduced to 75%.Continuous-rolling also is called MPM (Multi-Stand Plug Mill-multimachine frame plug milling train).
Usually continuous-rolling is to be made of seven to nine rolling-mill housing that are provided with of closely connecting.Single rolling-mill housing for example rotates relative to one another with 90 ° of angles respectively.The peripheral speed of milling train reduces coordinated with each otherly according to the cross section, is not having big pulling force or upset force to affact on the rolled piece between the frame like this.
In continuous-rolling, begin before the process that is rolled piercer to be inserted or penetrates among the hollow blank.Later hollow blank is pushed in the continuous-rolling together with piercer when reaching certain position.Rolled piece is caught by milling train, and is subjected to spreading by the roll pass that becomes more little from a milling train to another milling train piercer.In this case because the speed of the increase piercer of bar rolling speed also becomes increasing.
The pipe end enters into an extraction milling train that is arranged on the continuous-rolling back when the forming degree of the pipe that is reached for continuous-rolling regulation.Extract the piercer of extracting out in the milling train in processing pipe so far forth at this.Because most double high rolling mills that use are that oval-shaped pass designing institute is can reach a gap between this piercer and rolled piece.This gap evenly distributes around circumference in last circular hole, can unclamp piercer more easily like this.Piercer is retracted into original position then, releases piercer and inserts a new piercer.Before a piercer uses, must cool off, so just require a piercer circulation it.By eight to ten piercers with same size are arranged in circulation substantially.
No matter be in the skew rolling mill of ingot blank being bored a hole into hollow blank or in the continuous-rolling of a multimachine frame, hollow blank is rolled into a well-known problem that exists in the milling train of pipe be since partly have huge power so mandrel stem to stand the distortion.Plug also moves with the longitudinal axis of piercer prejudicially at the axial end portion of mandrel stem like this.Consequently the in uneven thickness of wall appears in hollow blank and pipe on their circumference.This class problem also appears when using the piercer (rolled bar) of its linearity or rigidity deficiency.
Summary of the invention
Therefore task of the present invention is that the piercer that this paper starts described type is improved, thereby even mandrel stem has certain distortion also can make hollow blank to be processed or pipe to be processed reach a kind of uniform wall thickness.
According to the present invention, this task is finished by following measure, and promptly plug radially is provided with movably with respect to mandrel stem.Avoid or reduce at least by this measure because the caused radial effect wall thickness deviation that power occurs of piercer.
Mandrel stem can have one radially in this case, perhaps (hierzu) extends in parallel with it, and exceeds the guide section that the axial end portion of mandrel stem stretches out.This guide section be engaged in the plug one accordingly, radially or in the recess that extends in parallel with it.
Can stipulate correspondingly that instead mandrel stem has one radially, the perhaps recess that extends abreast with it, axial end portion that exceeds plug stretch out, and radially, perhaps the corresponding guide section that extends in parallel with it is engaged in the described recess.
In addition, two guide sections and recess are provided with also can axially being adjacent to, and wherein, these two are provided with the longitudinal axis half-twist around piercer relative to one another.Plug is moved with respect to mandrel stem in the radial direction at all.
Between guide section and recess, can form a linear guide apparatus.Between the bottom of the axial end region of guide section and recess, also can form a linear guide apparatus.The surface of guide section and recess can be provided with a kind of sliding bearing material.In the zone of linear guide apparatus, lubricant can be set.For example can be a kind of lubricating grease in this case.
According to an improvement project cooling device is set in piercer, can cools off piercer with this cooling device.Cooling device comprises parts of vessels.Cooling medium can be incorporated into the endoporus that stretches extending axially of a regulation in the piercer with parts of vessels.
For obtain long service life can the regulation mandrel stem and/or the outer surface of plug a layer that is made of anti-abrasive material, the particularly layer that is made of ceramic material are set.
This mandrel stem is in its shape that can have a slight taper that extends axially at last.This helps extracting in the pipe of making of mandrel stem from hollow blank.
Can produce hollow blank or pipe by these measures of the present invention with uniform wall thickness.At the mandrel stem of rear portion axial restraint, plug (plug point) is with several millimeters radial clearance setting for unchangeably.Therefore be not fixedly coupled between mandrel stem and plug, for example bolt connects.
The transmission of the power of the radial effect from the mandrel stem to the plug is avoided or reduced at least to the scheme of passing through to be advised.
The present invention preferably uses during the perforation in Mannesmann piercing mill when producing seamless steel pipe.
Description of drawings
Some embodiments of the present invention shown in the drawings.
These accompanying drawings are:
Fig. 1: the simplified side view that is used for producing the piercer of pipe from hollow blank.
Fig. 2: the enlarged drawing of the right-hand component of the piercer of Fig. 1 of first form of implementation of the present invention.
Fig. 3: with the figure shown in the mode of Fig. 2 according to an alternative form of implementation of the present invention.
The specific embodiment
Can see a piercer from Fig. 1.It has a mandrel stem 2 that extends along longitudinal axis L.On its axial end portion 3, be provided with a plug 4.Start described mode according to this paper and use piercer 1, in order that preferably with disclosed mode in a kind of Mannesmann piercing mill from hollow blank rolling pipe come.
In one first form of implementation of the present invention of Fig. 2, a zone has been shown.Plug 4 on the mandrel stem 2 just is arranged in this zone.Mandrel stem 2 has a guide section 5 that extends on the whole diameter of mandrel stem in its axial end region.This guide section 5 radially R extends.Plug 4 has a recess 6.The groove that this recess arrangement becomes to form on the whole diameter of plug 4, and also R extension radially.Therefore the guide section 5 that is inserted in the recess 6 forms a linear guide apparatus 7.This linear guide apparatus make plug 4 with respect to mandrel stem 2 radially R can move.When mandrel stem 2 when eccentric oscillating motion is done in the end of plug 4 by plug 4 and mandrel stem 2 between radially motion linear guide apparatus 7 make plug 4 keep its positions, and can be pushed at the center for the treatment of rolling hollow blank and to advance, pipe just has the distribution of the thickness of a uniform wall like this.
This linear guide apparatus 7 also can form by the distolateral face of mandrel stem 2 and plug 4.As appreciable in Fig. 2, the axial end region 8 of guide section 5 and the bottom 9 of recess 6 are opposed.These two faces form a linear guide apparatus 10 together.
Shown in the embodiment that substitutes of Fig. 3, guide section 5 ' also is arranged on the plug 4.Mandrel stem 2 has recess 6 ' in its axial end region in this case, to form linear guide apparatus 7.
In addition, shown in dashed lines among Fig. 3, on the next door of linear guide apparatus 7 another linear guide apparatus is set.The structure of this linear guide apparatus and linear guide apparatus 7 are similar.Yet this linear guide apparatus is provided with around the longitudinal axes L half-twist.At this, guide section 5 " be engaged to a corresponding recess 6 " in.The two pairs of guide sections 5 ' or 5 " and recess 6 ' or 6 " make plug 4 become possibility with respect to mandrel stem 2 all relatively moving in the radial direction.
For fear of the hot-spot in the workspace, mandrel stem 2 can be done small oscillating movement in the operation of rolling.
But in all schemes, all to stand continuous cooling in the operation of rolling of regulation piercer 1 in continuous-rolling.
An improvement project has been stipulated the mandrel stem 2 of a conical design, this make after continuous rolling with pipe from mandrel stem 2 take off and roll under become easy.
The Reference numeral table
1 piercer
2 mandrel stems
3 axial end portions
4 plugs
5 guide sections
5 ' guide section
5 " guide section
6 recesses
6 ' recess
6 " recess
7 linear guide apparatus
The axial end region of 8 guide sections
9 concave bottom
10 linear guide apparatus
The L longitudinal axis
Claims (12)
1. be used for the rolling piercer (1) that is received in the hollow blank on the piercer (1), wherein, this piercer (1) has the mandrel stem (2) that has at the last plug (4) that is provided with of axial end portion (3) of mandrel stem (2), it is characterized in that, this plug (4) with respect to mandrel stem (2) radially (R) be provided with movably.
2. according to the described piercer of claim 1, it is characterized in that, mandrel stem (2) has at least one guide section (5) of stretching out of (R) or the axial end portion that extends in parallel with it and exceed mandrel stem (2) radially, and this guide section is engaged in the plug (4) at least one radially in (R) or the corresponding concave part (6) that extends in parallel with it.
3. according to the described piercer of claim 1, it is characterized in that, mandrel stem (2) has at least one radially (R) or recess (6 ') of extending in parallel with it, and at least one exceeds that the axial end portion of plug (4) stretches out and radially (R) or be engaged in the described recess (6 ') with corresponding guide section (5 ') that it extends in parallel.
4. according to claim 2 or 3 described piercers, it is characterized in that, two guide sections (5 ', 5 ") and recess (6 ', 6 ") to (5 ', 6 '; 5 ", 6 ") axial adjacent setting, wherein, these two to (5 ', 6 '; 5 ", 6 ") be provided with around longitudinal axis (L) the half-twist ground of piercer (1) relative to one another.
5. according to each described piercer in the claim 2 to 4, it is characterized in that, between guide section (5,5 ', 5 ") and recess (6,6 ', 6 "), form linear guide apparatus (7).
6. according to each described piercer in the claim 2 to 5, it is characterized in that, between the bottom (9) of the axial end region (8) of guide section (5,5 ', 5 ") and recess (6,6 ', 6 "), form linear guide apparatus (10).
7. according to claim 5 or 6 described piercers, it is characterized in that surface guide section (5,5 ', 5 ") and recess (6,6 ', 6 ") is provided with the sliding bearing material.
8. according to each described piercer in the claim 5 to 7, it is characterized in that, in the zone of linear guide apparatus (7,10), can import lubricant.
9. according to each described piercer in the claim 1 to 8, it is characterized in that the generator of cooling agent.
10. according to the described piercer of claim 9, it is characterized in that the endoporus that stretches that extends axially at defined in the piercer (1) is set to the cooling agent input channel.
11. according to each described piercer in the claim 1 to 10, it is characterized in that, outer surface mandrel stem (2) and/or plug (4) be provided with by high-abrasive material particularly ceramic material constitute the layer.
12., it is characterized in that mandrel stem (2) upwards has slight conical in shape in axially walking of it according to each described piercer in the claim 1 to 11.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007045934 | 2007-09-25 | ||
| DE102007045934.5 | 2007-09-25 | ||
| DE102008031569.9 | 2008-07-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101396693A true CN101396693A (en) | 2009-04-01 |
Family
ID=40384525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101497548A Pending CN101396693A (en) | 2007-09-25 | 2008-09-25 | Piercer |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101396693A (en) |
| DE (1) | DE102008031569A1 (en) |
| RU (1) | RU2008138095A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324941A (en) * | 2014-09-05 | 2015-02-04 | 宁波惠杰钢管制造有限公司 | Perforated ejection rod device and use method thereof |
-
2008
- 2008-07-07 DE DE102008031569A patent/DE102008031569A1/en not_active Withdrawn
- 2008-09-24 RU RU2008138095/02A patent/RU2008138095A/en not_active Application Discontinuation
- 2008-09-25 CN CNA2008101497548A patent/CN101396693A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324941A (en) * | 2014-09-05 | 2015-02-04 | 宁波惠杰钢管制造有限公司 | Perforated ejection rod device and use method thereof |
| CN104324941B (en) * | 2014-09-05 | 2015-12-09 | 宁波惠杰钢管制造有限公司 | A kind of perforation pin-lift arrangement and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008031569A1 (en) | 2009-04-02 |
| RU2008138095A (en) | 2010-03-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090401 |