CA1137742A - Method of and apparatus for the production of cylindrical bodies - Google Patents
Method of and apparatus for the production of cylindrical bodiesInfo
- Publication number
- CA1137742A CA1137742A CA000339451A CA339451A CA1137742A CA 1137742 A CA1137742 A CA 1137742A CA 000339451 A CA000339451 A CA 000339451A CA 339451 A CA339451 A CA 339451A CA 1137742 A CA1137742 A CA 1137742A
- Authority
- CA
- Canada
- Prior art keywords
- support
- hollow body
- members
- support means
- hollow
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B3/00—General-purpose turning-machines or devices, e.g. centre lathes with feed rod and lead screw; Sets of turning-machines
- B23B3/06—Turning-machines or devices characterised only by the special arrangement of constructional units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0538—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor for rotating tubes, e.g. rollers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Apparatus for axially rotatably clamping a cylindrical hollow body during weld coating of the hollow body to increase the wall thickness thereof has a pair of supports for opposite ends of the body, the supports each comprising a plurality of support members which are radially adjustable within the hollow body for releasably clamping the latter. The supports are mounted on co-axial cylindrical members, which in turn are rotatably supported on rollers.
Apparatus for axially rotatably clamping a cylindrical hollow body during weld coating of the hollow body to increase the wall thickness thereof has a pair of supports for opposite ends of the body, the supports each comprising a plurality of support members which are radially adjustable within the hollow body for releasably clamping the latter. The supports are mounted on co-axial cylindrical members, which in turn are rotatably supported on rollers.
Description
:
The present inven-tion relates to apparatus for axially ro-ta-tably clamping a cylindrical hollow body during w~ld coating of -the hollow body to increase t:he wall thickness thereof.
Such apparatus can be used for the production of cylindrical hollow bodies of large wall thicknesses and con-siderable lengths (e.g. 10,000 mm), such as are used, for ex-ample, in reactor construction.
The production of such hollow bodies from high quality steel has hither-to been limited, since roller devlces, for ob-vious reasons, cannot handle oversize wall thicknesses, e.g.
~ wall thicknesses of ~00 mm or more.
''`:i It is an object of the present invention to provide a ~;
novel and improved apparatus for axially rotatably clamping a cylindrical hollow body.
According to the present invention, there is provided ; apparatus for axially rotatably clamping a cylindrical hollow body during weld coatiny of the hollow body to increase the wall thickness thereof, the apparatus comprising first and second support means for supporting opposite respective ends of the hollow body; the first and second support means each comprising a plurality of support members which are radially adjustable `~1 within the hollow body for releasably clamping the latter; first and second co-axial cylindrical members on which the first and `
second support means are respectively mounted; and first and second roller support means for rotatably supporting the first and second cylindrical members, respectively, and therewith the first and second support means. `
When the apparatus is in use, a cylindrical hollow base body of relatively small wall thickness is firstly pre-fabricated and the wall thickness of this hollow base body, which :
, ~:
~.3~7~:
,~
is made of h:Lgh quallty sheet s-teel of small thlckness, is ln-creased by applyi.ng onto -the periphery thereof a plurality of helically extending lines of weld material, which are ~used to-gether.
The roller support means includes respective support carriages which are relatively displaceable in the axial ' direction o~ the hollow body to accommodate variations in length ~; of the hollow body in response 1;o heating of the hollow body .~ caused by the melting operation.
Preferably, the ~irst and second support means com-!'~ prise guide means for slidably guiding the support members . during their radial adjustment and means are provided for effect-.~ ing the radial adjustment of the support members to adapt the apparatus to hollow bodies of different diameters, such means ` comprising, for example, threaded shafts.
~; The roller support means may include wedge means, on which the rollers are supported, for horizontally and vertically adjustably displacing the support rollers, and the apparatus may further comprise drive means for rotating the hollow body, the drive means comprising a drive motor connected through a .. i~ thrust bearing to one of the cylindrical members.
It has been found that the weld coating satisfies high metallurgical requirements for loading capacity, in particular if the helically extending weld lines are produced on -the axially rotating base body by a powder welding process.
In order to minimize the production time of a hollow .~ body produced as described hereinabove, the weld lines may be ` produced by a plurality of horizontally synchronously driveable, reversible and vertically adjustably arranged welding devices.
For example, the welding devices may comprise welding
The present inven-tion relates to apparatus for axially ro-ta-tably clamping a cylindrical hollow body during w~ld coating of -the hollow body to increase t:he wall thickness thereof.
Such apparatus can be used for the production of cylindrical hollow bodies of large wall thicknesses and con-siderable lengths (e.g. 10,000 mm), such as are used, for ex-ample, in reactor construction.
The production of such hollow bodies from high quality steel has hither-to been limited, since roller devlces, for ob-vious reasons, cannot handle oversize wall thicknesses, e.g.
~ wall thicknesses of ~00 mm or more.
''`:i It is an object of the present invention to provide a ~;
novel and improved apparatus for axially rotatably clamping a cylindrical hollow body.
According to the present invention, there is provided ; apparatus for axially rotatably clamping a cylindrical hollow body during weld coatiny of the hollow body to increase the wall thickness thereof, the apparatus comprising first and second support means for supporting opposite respective ends of the hollow body; the first and second support means each comprising a plurality of support members which are radially adjustable `~1 within the hollow body for releasably clamping the latter; first and second co-axial cylindrical members on which the first and `
second support means are respectively mounted; and first and second roller support means for rotatably supporting the first and second cylindrical members, respectively, and therewith the first and second support means. `
When the apparatus is in use, a cylindrical hollow base body of relatively small wall thickness is firstly pre-fabricated and the wall thickness of this hollow base body, which :
, ~:
~.3~7~:
,~
is made of h:Lgh quallty sheet s-teel of small thlckness, is ln-creased by applyi.ng onto -the periphery thereof a plurality of helically extending lines of weld material, which are ~used to-gether.
The roller support means includes respective support carriages which are relatively displaceable in the axial ' direction o~ the hollow body to accommodate variations in length ~; of the hollow body in response 1;o heating of the hollow body .~ caused by the melting operation.
Preferably, the ~irst and second support means com-!'~ prise guide means for slidably guiding the support members . during their radial adjustment and means are provided for effect-.~ ing the radial adjustment of the support members to adapt the apparatus to hollow bodies of different diameters, such means ` comprising, for example, threaded shafts.
~; The roller support means may include wedge means, on which the rollers are supported, for horizontally and vertically adjustably displacing the support rollers, and the apparatus may further comprise drive means for rotating the hollow body, the drive means comprising a drive motor connected through a .. i~ thrust bearing to one of the cylindrical members.
It has been found that the weld coating satisfies high metallurgical requirements for loading capacity, in particular if the helically extending weld lines are produced on -the axially rotating base body by a powder welding process.
In order to minimize the production time of a hollow .~ body produced as described hereinabove, the weld lines may be ` produced by a plurality of horizontally synchronously driveable, reversible and vertically adjustably arranged welding devices.
For example, the welding devices may comprise welding
2 -,~
.
^~
3L~ 2 heacls syrlchronously driveable by a chain drive and each associ-ated with a respective supply carriage.
o compensate for the increasing thickness of the weld coating, the welding heads may be mounted so as -to be vertically adjustable.
The supply carriages associated with the welding heads ; serve to receive welding wire provided, for example, on one or ' more reels and welding powder.
In order to ensure that a continuous and therefore rational working operation can be achieved with respect to the weld coating, both the welding heads and also ^the supply car-riages are moun-ted so as to be movable or slidable on rails and ~ transposable. Each supply carriage constitutes, with its associ-ated welding head, a unit which may, for example, be transposable ` by means of a lifting device, so that the unit, after reaching anP end position, can be returned to an initial position in order to ;~ again take part in the welding process.
:3 For this purpose, the rails may be vertically adjust- -able, for example by threaded shafts or a hydraulic device, with `1 :
~; 20 respect to the base body.
In order to form the weld coating from a plurality of helical lines of weld, a drive means, comprising a drive motor and a thrust bearing, is arranged on a pedestal and cooperates ; with one of the support means. The rotary movement imparted to ; the base body, which is adjusted in accordance with the diameter of the body and the welding speed, upon simultaneous horizontal -;~
and axial movement of the welding heads produces the helical weld lines which, fusing ^together, form the weld coating on the :
base body.
The support means may comprise support discs carrying
.
^~
3L~ 2 heacls syrlchronously driveable by a chain drive and each associ-ated with a respective supply carriage.
o compensate for the increasing thickness of the weld coating, the welding heads may be mounted so as -to be vertically adjustable.
The supply carriages associated with the welding heads ; serve to receive welding wire provided, for example, on one or ' more reels and welding powder.
In order to ensure that a continuous and therefore rational working operation can be achieved with respect to the weld coating, both the welding heads and also ^the supply car-riages are moun-ted so as to be movable or slidable on rails and ~ transposable. Each supply carriage constitutes, with its associ-ated welding head, a unit which may, for example, be transposable ` by means of a lifting device, so that the unit, after reaching anP end position, can be returned to an initial position in order to ;~ again take part in the welding process.
:3 For this purpose, the rails may be vertically adjust- -able, for example by threaded shafts or a hydraulic device, with `1 :
~; 20 respect to the base body.
In order to form the weld coating from a plurality of helical lines of weld, a drive means, comprising a drive motor and a thrust bearing, is arranged on a pedestal and cooperates ; with one of the support means. The rotary movement imparted to ; the base body, which is adjusted in accordance with the diameter of the body and the welding speed, upon simultaneous horizontal -;~
and axial movement of the welding heads produces the helical weld lines which, fusing ^together, form the weld coating on the :
base body.
The support means may comprise support discs carrying
- 3 -`" ~ 7'7~LZ
., the support members, the support discs being in force trans-mit-ting connec-tion wi-th hollow stub shaf-ts forming the cylin-drical members, which in turn are each mounted on the above-; mentioned support carriages~
he arrangement is such -that the driven end of -the base body serves as a fixed point, while the opposite end of ~; the base body, which likewise lies on one of the support car-,i riages, can extend axially in response to the heating e~fect by movement of the carriage which is provided at such other end ;~
mounted on running rollers so as to be horizontally displaceable.
The invention will be more readily understood from the following description of a preferred embodiment thereof given, :`! by way of example, with reference to the accompanying drawings, in which:-Figure 1 shows a side view of apparatus for producing a large diameter cylindrical body; and Figure 2 shows an end view of parts of the apparatus '~ of Figure 1.
-1 ~
~i In Figure 1, there is illustrated a pedestal 1 on which are mounted a drive motor 2 and a thrust bearing 3. The thrust bearing 3 is drivingly connected to one of a pair of hollow stub shafts 6, which are each supported on support rol-lers 8 of a respective carriage 5, which in turn is mounted on running wheels.
The hollow shafts 6 extend into opposite ends of a ,~ prefabricated base body 10, which has a circular cross-section ,~ and a relatively thin wall thickness (e.g. 30 to S0 mm), the hollow shafts 6 each being rotatably supported on the carriages 5 by the support rollers 8, which contact the outer peripheries of the hollow shafts 6.
., the support members, the support discs being in force trans-mit-ting connec-tion wi-th hollow stub shaf-ts forming the cylin-drical members, which in turn are each mounted on the above-; mentioned support carriages~
he arrangement is such -that the driven end of -the base body serves as a fixed point, while the opposite end of ~; the base body, which likewise lies on one of the support car-,i riages, can extend axially in response to the heating e~fect by movement of the carriage which is provided at such other end ;~
mounted on running rollers so as to be horizontally displaceable.
The invention will be more readily understood from the following description of a preferred embodiment thereof given, :`! by way of example, with reference to the accompanying drawings, in which:-Figure 1 shows a side view of apparatus for producing a large diameter cylindrical body; and Figure 2 shows an end view of parts of the apparatus '~ of Figure 1.
-1 ~
~i In Figure 1, there is illustrated a pedestal 1 on which are mounted a drive motor 2 and a thrust bearing 3. The thrust bearing 3 is drivingly connected to one of a pair of hollow stub shafts 6, which are each supported on support rol-lers 8 of a respective carriage 5, which in turn is mounted on running wheels.
The hollow shafts 6 extend into opposite ends of a ,~ prefabricated base body 10, which has a circular cross-section ,~ and a relatively thin wall thickness (e.g. 30 to S0 mm), the hollow shafts 6 each being rotatably supported on the carriages 5 by the support rollers 8, which contact the outer peripheries of the hollow shafts 6.
4 -~: .
7~2 ~, ach of the hollow shaf-ts 6 carrles a support disc 9, which is provided with guide rails 11 slidably yuiding support members 7. The support members 7 are radially adjustable by threaded shaft or worm mechanism or the like (not shown) for clamping engagement with the interior wall surface of the pre-fabricated base body 10, which is made of high quality steel.
The support members 7, radially displaced this way into ahutment ~' with the base body 10, ensure that even when the latter is raised ~ to high temperatures by the weldiny operation, it retains its ; 10 circular cross-section. The longitudinal expansion of the hollow body caused by the welding heat is taken up by corresponding dis-; placement, on its running wheels, of the carriage 5 which is located at the end of the hollow body 10 opposite from that which i is driven by the drive motor 2.
'. ~
a A welding device illustrated in Figure 1, and in particular its control device for the welding units which are .~
synchronously driveable in the horizontal direction, through a chain drive (not sh~wn) is not the subject matter of the present invention and therefore, for the sake of simplicity, will be described only with respect to its more important features.
As is apparent, a weld coating 18 applied to the ex--terior of the base body 10 is produced by a plurality of welding heads 19, each of which forms a unit with a respective supply carriage 21, which holds a large supply of welding wire and powder. Each unit is mounted for displacement along a common -track 22 and can be lifted from the latter by means of a lifting ~-device (not shown) as soon as it reaches an end position, i.e. ~ `
~'~ the vicinity of the left-hand end of the base body 10 as viewed in Figure 1. ,-The unit is then returned to its initial position, i.e.
., :
.
r., '' , ', ! ~
to the vicinlty of the right-hand end of the base body 10 as viewed in Figure 1, and then begins the production of a further helical line oE weld.
To adapt to -the particular base body 10 being pro-'~` cessed, which may vary in diameter e.g. from 3,000 to 7,000 mm, ,~
the hollow shafts 6 which support the base body 10 through the support discs 9 and the support members 7 are moun-ted on the support rollers 8, whlch are both horizontally and vertically ; adjustable by means of threaded shafts 13 and 14 and a ~air of 10 wedges 15 and 17 supporting the rollers 8.
, .
Since the spacing of the welding heads from the hollow body 10 must be increased as the thickness of the weld coating 18 increases, e.g. from 400 to 700 mm, about 50 hours being re-quired for a diameter increase of 8 to 10 mm, the welding heads 19 must be vertically adjustably mounted.
. I ( `I The diameter of the hollow base body varies from case to case. This is taken into account by making the rails 22, which mount the welding heads 19 and the supply carriayes 21, ~ vertically adjustable by threaded adjustment shafts 23.
..~
~ 20 . , , ~ ~ .
. .
~ ,~
.,~,, .
. ~:
;'. ':
.''`'.
'',
7~2 ~, ach of the hollow shaf-ts 6 carrles a support disc 9, which is provided with guide rails 11 slidably yuiding support members 7. The support members 7 are radially adjustable by threaded shaft or worm mechanism or the like (not shown) for clamping engagement with the interior wall surface of the pre-fabricated base body 10, which is made of high quality steel.
The support members 7, radially displaced this way into ahutment ~' with the base body 10, ensure that even when the latter is raised ~ to high temperatures by the weldiny operation, it retains its ; 10 circular cross-section. The longitudinal expansion of the hollow body caused by the welding heat is taken up by corresponding dis-; placement, on its running wheels, of the carriage 5 which is located at the end of the hollow body 10 opposite from that which i is driven by the drive motor 2.
'. ~
a A welding device illustrated in Figure 1, and in particular its control device for the welding units which are .~
synchronously driveable in the horizontal direction, through a chain drive (not sh~wn) is not the subject matter of the present invention and therefore, for the sake of simplicity, will be described only with respect to its more important features.
As is apparent, a weld coating 18 applied to the ex--terior of the base body 10 is produced by a plurality of welding heads 19, each of which forms a unit with a respective supply carriage 21, which holds a large supply of welding wire and powder. Each unit is mounted for displacement along a common -track 22 and can be lifted from the latter by means of a lifting ~-device (not shown) as soon as it reaches an end position, i.e. ~ `
~'~ the vicinity of the left-hand end of the base body 10 as viewed in Figure 1. ,-The unit is then returned to its initial position, i.e.
., :
.
r., '' , ', ! ~
to the vicinlty of the right-hand end of the base body 10 as viewed in Figure 1, and then begins the production of a further helical line oE weld.
To adapt to -the particular base body 10 being pro-'~` cessed, which may vary in diameter e.g. from 3,000 to 7,000 mm, ,~
the hollow shafts 6 which support the base body 10 through the support discs 9 and the support members 7 are moun-ted on the support rollers 8, whlch are both horizontally and vertically ; adjustable by means of threaded shafts 13 and 14 and a ~air of 10 wedges 15 and 17 supporting the rollers 8.
, .
Since the spacing of the welding heads from the hollow body 10 must be increased as the thickness of the weld coating 18 increases, e.g. from 400 to 700 mm, about 50 hours being re-quired for a diameter increase of 8 to 10 mm, the welding heads 19 must be vertically adjustably mounted.
. I ( `I The diameter of the hollow base body varies from case to case. This is taken into account by making the rails 22, which mount the welding heads 19 and the supply carriayes 21, ~ vertically adjustable by threaded adjustment shafts 23.
..~
~ 20 . , , ~ ~ .
. .
~ ,~
.,~,, .
. ~:
;'. ':
.''`'.
'',
Claims (6)
1. Apparatus for axially rotatably clamping a cylin-drical hollow body during weld coating of the hollow body to in-crease the wall thickness thereof, the said apparatus comprising:
first and second support means for supporting opposite respective ends of said hollow body;
said first and second support means each comprising:
a plurality of support members which are radially ad-justable within the hollow body for releasably clamping the latter; and first and second co-axial cylindrical members on which said first and second support means are respectively mounted; and first and second roller support means for rotatably supporting said first and second cylindrical members, respec-tively, and therewith said first and second support means.
first and second support means for supporting opposite respective ends of said hollow body;
said first and second support means each comprising:
a plurality of support members which are radially ad-justable within the hollow body for releasably clamping the latter; and first and second co-axial cylindrical members on which said first and second support means are respectively mounted; and first and second roller support means for rotatably supporting said first and second cylindrical members, respec-tively, and therewith said first and second support means.
2. Apparatus as claimed in claim 1, wherein said roller support means includes respective support carriages which are relatively displaceable in the axial direction of said hollow body to accommodate variations in the length of said hollow body.
3. Apparatus as claimed in claim 1, wherein said first and second support means comprise guide means for slidably guiding said support members during the radial adjustment thereof and means are provided for effecting the radial adjustment of said support members.
4. Apparatus as claimed in claim 3, wherein said means for effecting the radial adjustment of said support mem-bers comprises threaded shaft drive mechanisms.
5. Apparatus as claimed in claim 1, 2 or 3, wherein said support rollers are mounted on wedge means for horizontally and vertically adjustably displacing said support rollers.
6. Apparatus as claimed in claim 1, 2 or 3, further comprising drive means for rotating said hollow body, said drive means comprising a drive motor connected through a thrust bear-ing to one of said cylindrical members.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2850721A DE2850721C3 (en) | 1978-11-23 | 1978-11-23 | Device for producing cylindrical hollow bodies |
| DE2850721.3-24 | 1978-11-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1137742A true CA1137742A (en) | 1982-12-21 |
Family
ID=6055376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000339451A Expired CA1137742A (en) | 1978-11-23 | 1979-11-08 | Method of and apparatus for the production of cylindrical bodies |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5827025B2 (en) |
| CA (1) | CA1137742A (en) |
| DE (1) | DE2850721C3 (en) |
| FR (1) | FR2442101A1 (en) |
| GB (1) | GB2035873B (en) |
| IT (1) | IT1126351B (en) |
| SE (1) | SE436846B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4611751A (en) * | 1983-01-12 | 1986-09-16 | Thyssen Aktiengesellschaft | Method and apparatus for the manufacture of cylindrical hollow bodies |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60102294A (en) * | 1983-11-10 | 1985-06-06 | Kawasaki Heavy Ind Ltd | Method and device for operation in production of structural member for transporting equipment body |
| US7596843B2 (en) * | 2005-06-16 | 2009-10-06 | The Boeing Company | Rotating internal support apparatus and method for large hollow structures |
| CA3191241A1 (en) | 2012-11-15 | 2014-05-22 | Velox-Puredigital Ltd. | Printing system and method |
| WO2015177599A1 (en) | 2014-05-20 | 2015-11-26 | Velox-Puredigital Ltd. | Printing system and method |
| CN104439875A (en) * | 2014-11-28 | 2015-03-25 | 安徽大盘压力容器有限公司 | Clamping device for gas cylinder inner and outer ring weld joint welding |
| IT201700098514A1 (en) * | 2017-09-01 | 2019-03-01 | A Narducci S P A | ANTI-DROP SYSTEM FOR ROLLER POSITIONERS |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB835030A (en) * | 1956-09-24 | 1960-05-18 | Rolls Royce | Improvements in or relating to welding apparatus |
| US3024349A (en) * | 1960-01-27 | 1962-03-06 | Automatic Welding Company | Roller re-surfacing machine |
| CS164989B1 (en) * | 1969-08-01 | 1975-11-28 | ||
| BE790147A (en) * | 1971-10-19 | 1973-04-16 | Sulzer Ag | PROCESS FOR MAKING THICK-WALL HOLLOW PARTS, IN PARTICULAR CYLINDRICAL, BY SUPPLY OF WELDING MATERIAL |
-
1978
- 1978-11-23 DE DE2850721A patent/DE2850721C3/en not_active Expired
-
1979
- 1979-11-08 CA CA000339451A patent/CA1137742A/en not_active Expired
- 1979-11-19 GB GB7939905A patent/GB2035873B/en not_active Expired
- 1979-11-20 FR FR7928579A patent/FR2442101A1/en active Granted
- 1979-11-20 IT IT27443/79A patent/IT1126351B/en active
- 1979-11-22 JP JP54151957A patent/JPS5827025B2/en not_active Expired
- 1979-11-23 SE SE7909720A patent/SE436846B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4611751A (en) * | 1983-01-12 | 1986-09-16 | Thyssen Aktiengesellschaft | Method and apparatus for the manufacture of cylindrical hollow bodies |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2442101B1 (en) | 1983-02-11 |
| GB2035873A (en) | 1980-06-25 |
| JPS5827025B2 (en) | 1983-06-07 |
| GB2035873B (en) | 1982-11-10 |
| DE2850721C3 (en) | 1981-08-27 |
| SE7909720L (en) | 1980-05-24 |
| DE2850721A1 (en) | 1980-05-29 |
| SE436846B (en) | 1985-01-28 |
| IT1126351B (en) | 1986-05-21 |
| IT7927443A0 (en) | 1979-11-20 |
| FR2442101A1 (en) | 1980-06-20 |
| DE2850721B2 (en) | 1980-09-18 |
| JPS5573472A (en) | 1980-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |