CA1123381A - Method and apparatus for producing seamless tubes - Google Patents
Method and apparatus for producing seamless tubesInfo
- Publication number
- CA1123381A CA1123381A CA336,443A CA336443A CA1123381A CA 1123381 A CA1123381 A CA 1123381A CA 336443 A CA336443 A CA 336443A CA 1123381 A CA1123381 A CA 1123381A
- Authority
- CA
- Canada
- Prior art keywords
- mandrel
- blank
- axis
- rollers
- walled
- 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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
"Method and Apparatus for Producing Seamless Tubes"
ABSTRACT
A short thick-walled tubular blank is placed onto a curved mandrel and then moved between rotating pressure rollers which convert the blank to the desired thin-walled tube by flow-pressing and shaping its material.
ABSTRACT
A short thick-walled tubular blank is placed onto a curved mandrel and then moved between rotating pressure rollers which convert the blank to the desired thin-walled tube by flow-pressing and shaping its material.
Description
11 2 3 ~ ~
"Method and Apparatus for Producing Seamless Tubes"
This invention relates to a method of making thin-walled seamless tubes and to an apparatus ~or carrying out the method.
There has not, here~ofore, been any possibili~y of forming bends in one-piece thin-walled seamless sheet-metal tubes. Thick-walled drawn elbows and other curved tube pieces have the disadvantage that in the bent area the tube diameter changes from the normal lO diameter, due to the upse~ting which occurs on the outer side o the bend, so that exac~t maintenance of the dimensions and precision in the shaping are im-possible. Such elbows as are used, for example, as part of downspouts on houses, are therefore mostly still made of two parts which are connected by welding or otherwise. If made of one piece and then bent, they develop large, unsightly ribs which are the result o~
upsetting at the inner side of the bend.
The present invention seeks to overcome the ~0 disadvantage of the p~ior art, and to provide a me~hod of, and an apparatus for, forming bends in thin-walled tubes while main~aining the exact desired shape and dimensions. Further, the surface of the bent tube is to remain smooth. The tube bends may be made with or without cylindrical extensions and o~ a variety ~`
of metals such as iron, copper, brass, , li~33E~l aluminum, zinc and othersO They may have a wall thick-ness of about 105 mm or mored down to about 0.2 mm.
Pursuant to the invention, a thick-walled short tubular blank is placed onto a core or mandrel which determines the shape of the desired bend, and is then moved between pressure rollers which rotate and also orbit about the blank; these cause the material of the blank to flow ànd thereby convert the blank into a thin-walled bent tube section having the desired shape Io and being provided with a smooth surfaceO While the blank is moved between the rollers, these are adjusted so as to move radially towards one anotherO
The invention permits the conversion of a thick-walled blank into a bend having a wall thickness of about 0O2 to 1O5mmO The radius of curvature of the bend may be selected as desired, and the same is true of the base angle and tube diameterO The surface of the finished bend will be completely smooth and without any seam, the desired shape will be achieved with ~O complete accuracy, and the selected diameter will be fully maintainedO
If it is desired to produce the already formed bend with cylindrical extensions, a cylindrical mandrel is secured to one or both ends of the curved mandrel, and a support of the apparatus is then shifted parallel to the axis of the swaging head : . :
:. - .
233~
carrying the pressure rollers, so as to form the desired extensions. It follows from this, incidentally, that the present invention also makes it possible to convert thick-walled tubes (serving as blanks) into thin-walled cylindrical tubes without bends. In no event do the blanks themselves rotate; they are only subjected to pressure causing their material to flow, by the radiall~
adjustable pressure rolls which orbit the blanks.
In accordance with one aspect of the invention there is provided a method of making thin-walled seamless tubes, comprising the steps of placing a short, thick-walled tubular blank onto an arcuately curved mandrel; moving the blank and mandrel between driven pressure rollers of a swaging head; and orbiting the head and rollers about the blank and deforming its material to cause the same to flow and accomodate itself to the shape of the mandrel; and placing a cylindrical mandrel against one end of the cur-ved mandrel; and shifting the blank and mandrels lengthwise of the orbiting axis of the swaging head 50 as to form over the cylindrical mandrel a cylindrical extension on the bent tube.
In accordance with another aspect of the invention there is provided an apparatus for making thin-walled seamless tubes, comprising mandrel means for supparting a short, thick-walled tubular blank; a swaging head including a plurality of driven pressure rollers movable radially towards and away from one another; means for moving the ! mandrel means and supported blank between the rollers;
means for orbiting the rollers about the mandrel means in pressure-exerting contact with the blank so as to cause the material thereof to flow and become converted into ~- 4 -llZ33~1 a thin-walled tube corresponding in shape and diameter to the mandrel means; and a base on which said means and swaging head are mounted, said mandrel means including a support pivotable on said base about a vertical axis, and an arcuately curved mandrel on said support.
The invention will now be explained with reference to an exemplary embodiment whlch is illustrated in the appended drawings, but which is not to be considered limiting in any sense.
FIG. 1 is a side view illustrating a machine for carrying out the method;
FIG. 2 is a top plan view thereof;
FIG. 3 is a view similar to the one in FIG. 2, but with the swaging head omitted;
FIG. 4 is a longitudinal section through the swaging head and support therefor;
FIG. 5 is a front elevation of the swaging head;
- - 4a -11;~33~3~
FIGO 6 iS a plan view o~ a blank to be deformed;
FIGD 7 is an end perspective of the same blank; and FIGO 8 iS a plan view o~ an article produced from the blank in FIGSO 6 and 70 Referring~ now to the drawing in detail, it will be seen that the machine has a base 1 and a frame 20 An electric mo~or 3 is mounted on the base I and serves to drive the swaging head 40 The head 4 is turnably mounted on frame 2 via l~ a hollow shaft 5 and bearings 6, 70 A push rod 8 iS
received in shaft 5 in which it can slide axially but not turn; it is actuated by a cylinder and piston 9 which may be hydraulic or pneumatic, or in some other suitable mannerO The free end of ~he push rod 8 extends into the swaging head 4 (FIGO 4) where it carries a removable cylindrical core or mandrel 10 which can be replaced by other cores having different diametersO
Rod 8 is guided in bearings 11 and a reciprocable cylinder 12 is mounted on the swaging head ~, which is reciprocable mechanically or in any other suitable man-ner, as indicated by the double-headed arrow l3D
Cylinder 12 has a conical inner part 14 which controls three pressure rollers 15 that are arranged in a star-shaped pattern in head 4 and can be moved radially l:lZ33Bl towards and away from one anotherO Rollers 15 are mounted on rods 16 which may be eOgO spring-loaded, so that the free ends of the rods 16 abut the inner surface of part 140 Rollers 17 may be provided, to act upon a ~lange 18 so as to move the cylinder 12 on the head 40 A cross-slide 19 is located beneath the head 4 and movable along rods 20 of the frame 2 lengthwise of the frame; its upper part 21 is movable cross-wise of the frame and carries a vertical shaft 22 which, in turn, carries a support 23 for a replaceable curved mandrel 240 The thick-walled tubular blank 25 is placed onto this mandrel 240 The pivoting radius R of the support 23 can be shortened or lengthened (by replacing the support with another one and shifting the part 21 cross-wise via utilization of slots 26 therein) to permit selection of different desired bending ratios and tube diame~ersO An electric motor 27 drives the support 23 via a transmission 28, to impart to the ao mandrel 24 a pivoting movement R in direction of the head 4 and the rollers 150 Cross-slide l9 is coupled with a rod 30 which is powered by a hydraulic or pneumatic cylinder 29 or else is movable electrically or manuallyO -An ejector 31 is provided which is pivotable on the part 21 of the cross-slide 19 and serves to eject l~Z33~3~
the finished thin-walled bend (tubular article) 33 from the mandrel 240 E~ector 31 has a free end formed with e~gO a bifurcated part 32 which engages one end of the finished article 33 at 360 Pivoting of ejector 31 in direction of the bend radius pushes article 33 off the mandrel 24 after the cross slide 19, 21 is moved away from the head 4 with rod 30 and support 230 It may be desired for the bend 33 to have cylin-drical extensions 24D If so, the mandrel 10 must be /0 applied to one end of the mandrel 240 The m~ndrel 10 is then moved against the end of mandrel 24c The cylin-drical extension may have the same diameter:as the bend 33, or its diameter may be larger or smaller (in which case a mandrel 10 of appropriate diameter must be installed)0 To form the cylindrical extension 34 the unit 9 is operated to shift the cross slide 19 lengthwise; the unit 29 may cooperate or may simply be taken along as the slide moves and the rollers de-form the material of the blank to form the cylindrical a o extensionO
The change of the radius R when an article having a different radius of bend than before is to be produced, could also be effected by constructing the arm 25 of support 23 so that it can be lengthened or shortened.
11~33~31 FIG D 8 shows that the Einal article produced from the blank 25 in FIGSo 6 and 7 is formed of one piece and has a completely smooth and seamless surfaceD
It has precisely the desired shape and exactly the desired diameterO The tubular extensions 24 may have the same diameter, or a smaller or larger diameter and the wall thickness may, depending upon the intended use, be between about 002 ànd about 105mmO
"Method and Apparatus for Producing Seamless Tubes"
This invention relates to a method of making thin-walled seamless tubes and to an apparatus ~or carrying out the method.
There has not, here~ofore, been any possibili~y of forming bends in one-piece thin-walled seamless sheet-metal tubes. Thick-walled drawn elbows and other curved tube pieces have the disadvantage that in the bent area the tube diameter changes from the normal lO diameter, due to the upse~ting which occurs on the outer side o the bend, so that exac~t maintenance of the dimensions and precision in the shaping are im-possible. Such elbows as are used, for example, as part of downspouts on houses, are therefore mostly still made of two parts which are connected by welding or otherwise. If made of one piece and then bent, they develop large, unsightly ribs which are the result o~
upsetting at the inner side of the bend.
The present invention seeks to overcome the ~0 disadvantage of the p~ior art, and to provide a me~hod of, and an apparatus for, forming bends in thin-walled tubes while main~aining the exact desired shape and dimensions. Further, the surface of the bent tube is to remain smooth. The tube bends may be made with or without cylindrical extensions and o~ a variety ~`
of metals such as iron, copper, brass, , li~33E~l aluminum, zinc and othersO They may have a wall thick-ness of about 105 mm or mored down to about 0.2 mm.
Pursuant to the invention, a thick-walled short tubular blank is placed onto a core or mandrel which determines the shape of the desired bend, and is then moved between pressure rollers which rotate and also orbit about the blank; these cause the material of the blank to flow ànd thereby convert the blank into a thin-walled bent tube section having the desired shape Io and being provided with a smooth surfaceO While the blank is moved between the rollers, these are adjusted so as to move radially towards one anotherO
The invention permits the conversion of a thick-walled blank into a bend having a wall thickness of about 0O2 to 1O5mmO The radius of curvature of the bend may be selected as desired, and the same is true of the base angle and tube diameterO The surface of the finished bend will be completely smooth and without any seam, the desired shape will be achieved with ~O complete accuracy, and the selected diameter will be fully maintainedO
If it is desired to produce the already formed bend with cylindrical extensions, a cylindrical mandrel is secured to one or both ends of the curved mandrel, and a support of the apparatus is then shifted parallel to the axis of the swaging head : . :
:. - .
233~
carrying the pressure rollers, so as to form the desired extensions. It follows from this, incidentally, that the present invention also makes it possible to convert thick-walled tubes (serving as blanks) into thin-walled cylindrical tubes without bends. In no event do the blanks themselves rotate; they are only subjected to pressure causing their material to flow, by the radiall~
adjustable pressure rolls which orbit the blanks.
In accordance with one aspect of the invention there is provided a method of making thin-walled seamless tubes, comprising the steps of placing a short, thick-walled tubular blank onto an arcuately curved mandrel; moving the blank and mandrel between driven pressure rollers of a swaging head; and orbiting the head and rollers about the blank and deforming its material to cause the same to flow and accomodate itself to the shape of the mandrel; and placing a cylindrical mandrel against one end of the cur-ved mandrel; and shifting the blank and mandrels lengthwise of the orbiting axis of the swaging head 50 as to form over the cylindrical mandrel a cylindrical extension on the bent tube.
In accordance with another aspect of the invention there is provided an apparatus for making thin-walled seamless tubes, comprising mandrel means for supparting a short, thick-walled tubular blank; a swaging head including a plurality of driven pressure rollers movable radially towards and away from one another; means for moving the ! mandrel means and supported blank between the rollers;
means for orbiting the rollers about the mandrel means in pressure-exerting contact with the blank so as to cause the material thereof to flow and become converted into ~- 4 -llZ33~1 a thin-walled tube corresponding in shape and diameter to the mandrel means; and a base on which said means and swaging head are mounted, said mandrel means including a support pivotable on said base about a vertical axis, and an arcuately curved mandrel on said support.
The invention will now be explained with reference to an exemplary embodiment whlch is illustrated in the appended drawings, but which is not to be considered limiting in any sense.
FIG. 1 is a side view illustrating a machine for carrying out the method;
FIG. 2 is a top plan view thereof;
FIG. 3 is a view similar to the one in FIG. 2, but with the swaging head omitted;
FIG. 4 is a longitudinal section through the swaging head and support therefor;
FIG. 5 is a front elevation of the swaging head;
- - 4a -11;~33~3~
FIGO 6 iS a plan view o~ a blank to be deformed;
FIGD 7 is an end perspective of the same blank; and FIGO 8 iS a plan view o~ an article produced from the blank in FIGSO 6 and 70 Referring~ now to the drawing in detail, it will be seen that the machine has a base 1 and a frame 20 An electric mo~or 3 is mounted on the base I and serves to drive the swaging head 40 The head 4 is turnably mounted on frame 2 via l~ a hollow shaft 5 and bearings 6, 70 A push rod 8 iS
received in shaft 5 in which it can slide axially but not turn; it is actuated by a cylinder and piston 9 which may be hydraulic or pneumatic, or in some other suitable mannerO The free end of ~he push rod 8 extends into the swaging head 4 (FIGO 4) where it carries a removable cylindrical core or mandrel 10 which can be replaced by other cores having different diametersO
Rod 8 is guided in bearings 11 and a reciprocable cylinder 12 is mounted on the swaging head ~, which is reciprocable mechanically or in any other suitable man-ner, as indicated by the double-headed arrow l3D
Cylinder 12 has a conical inner part 14 which controls three pressure rollers 15 that are arranged in a star-shaped pattern in head 4 and can be moved radially l:lZ33Bl towards and away from one anotherO Rollers 15 are mounted on rods 16 which may be eOgO spring-loaded, so that the free ends of the rods 16 abut the inner surface of part 140 Rollers 17 may be provided, to act upon a ~lange 18 so as to move the cylinder 12 on the head 40 A cross-slide 19 is located beneath the head 4 and movable along rods 20 of the frame 2 lengthwise of the frame; its upper part 21 is movable cross-wise of the frame and carries a vertical shaft 22 which, in turn, carries a support 23 for a replaceable curved mandrel 240 The thick-walled tubular blank 25 is placed onto this mandrel 240 The pivoting radius R of the support 23 can be shortened or lengthened (by replacing the support with another one and shifting the part 21 cross-wise via utilization of slots 26 therein) to permit selection of different desired bending ratios and tube diame~ersO An electric motor 27 drives the support 23 via a transmission 28, to impart to the ao mandrel 24 a pivoting movement R in direction of the head 4 and the rollers 150 Cross-slide l9 is coupled with a rod 30 which is powered by a hydraulic or pneumatic cylinder 29 or else is movable electrically or manuallyO -An ejector 31 is provided which is pivotable on the part 21 of the cross-slide 19 and serves to eject l~Z33~3~
the finished thin-walled bend (tubular article) 33 from the mandrel 240 E~ector 31 has a free end formed with e~gO a bifurcated part 32 which engages one end of the finished article 33 at 360 Pivoting of ejector 31 in direction of the bend radius pushes article 33 off the mandrel 24 after the cross slide 19, 21 is moved away from the head 4 with rod 30 and support 230 It may be desired for the bend 33 to have cylin-drical extensions 24D If so, the mandrel 10 must be /0 applied to one end of the mandrel 240 The m~ndrel 10 is then moved against the end of mandrel 24c The cylin-drical extension may have the same diameter:as the bend 33, or its diameter may be larger or smaller (in which case a mandrel 10 of appropriate diameter must be installed)0 To form the cylindrical extension 34 the unit 9 is operated to shift the cross slide 19 lengthwise; the unit 29 may cooperate or may simply be taken along as the slide moves and the rollers de-form the material of the blank to form the cylindrical a o extensionO
The change of the radius R when an article having a different radius of bend than before is to be produced, could also be effected by constructing the arm 25 of support 23 so that it can be lengthened or shortened.
11~33~31 FIG D 8 shows that the Einal article produced from the blank 25 in FIGSo 6 and 7 is formed of one piece and has a completely smooth and seamless surfaceD
It has precisely the desired shape and exactly the desired diameterO The tubular extensions 24 may have the same diameter, or a smaller or larger diameter and the wall thickness may, depending upon the intended use, be between about 002 ànd about 105mmO
Claims (11)
1. A method of making thin-walled seamless tubes, comprising the steps of placing a short, thick-walled tubular blank onto an arcuately curved mandrel;
moving the blank and mandrel between driven pressure rollers of a swaging head; and orbiting the head and rollers about the blank and deforming its material to cause the same to flow and accomodate itself to the shape of the mandrel; and placing a cylindrical mandrel against one end of the curved mandrel; and shifting the blank and mandrels lengthwise of the orbiting axis of the swaging head so as to form over the cylindrical mandrel a cylindrical extension on the bent tube.
moving the blank and mandrel between driven pressure rollers of a swaging head; and orbiting the head and rollers about the blank and deforming its material to cause the same to flow and accomodate itself to the shape of the mandrel; and placing a cylindrical mandrel against one end of the curved mandrel; and shifting the blank and mandrels lengthwise of the orbiting axis of the swaging head so as to form over the cylindrical mandrel a cylindrical extension on the bent tube.
2. A method as defined in claim 1 r wherein the mandrel is cylindrical and non-rotatable; and wherein the step of moving comprises advancing the mandrel and blank lengthwise of the orbiting axis of the head so as to convert the blank into a thin-walled cylindrical tube.
3. An apparatus for making thin-walled seamless tubes, comprising mandrel means for supporting a short, thick-walled tubular blank;
a swaging head including a plurality of driven pressure rollers movable radially towards and away from one another;
means for moving the mandrel means and supported blank between the rollers;
means for orbiting the rollers about the mandrel means in pressure-exerting contact with the blank so as to cause the material thereof to flow and become converted into a thin-walled tube corresponding in shape and diameter to the mandrel means; and a base on which said means and swaging head are mounted, said mandrel means including a support pivotable on said base about a vertical axis, and an arcuately curved mandrel on said support.
a swaging head including a plurality of driven pressure rollers movable radially towards and away from one another;
means for moving the mandrel means and supported blank between the rollers;
means for orbiting the rollers about the mandrel means in pressure-exerting contact with the blank so as to cause the material thereof to flow and become converted into a thin-walled tube corresponding in shape and diameter to the mandrel means; and a base on which said means and swaging head are mounted, said mandrel means including a support pivotable on said base about a vertical axis, and an arcuately curved mandrel on said support.
4. An apparatus as defined in claim 3, said support having an arm extending transversely of said axis and said support being replaceable with another support having an arm of a different length so as to produce a bend having a different radius.
5. An apparatus as defined in claim 3, said support having an arm extending transversely of said axis and being of variable length, so as to produce bends of different radii in dependence upon the selected length of the arm.
6. An apparatus as defined in claim 3, said swaging head including a cylinder coaxial to the orbiting axis of the rollers and being shiftable lengthwise of said axis, said cylinder having a conical inner surface, and said rollers each being mounted on a radially extending rod having a radially outer end which is spring-biased into contact with said inner surface, so that said rollers are movable towards and away from said axis and from one another by axial shifting of said cylinder.
7. An apparatus as defined in claim 3, said mandrel being a curved mandrel; further comprising a hollow shaft for said swaging head and a rod shiftable but non-rotatably received in said hollow shaft, a replaceable cylindrical mandrel secured to one end of said rod and located within said swaging head and being movable against one end of said curved mandrel so as to permit the formation of a cylindrical extension on -the curved thin-walled tube by longitudinal shifting of said rod and cylindrical mandrel.
8. An apparatus as defined in claim 3, further comprising an electric motor coupled to a transmission which is linked to said support to effect pivoting of the same.
9. An apparatus as defined in claim 8, further comprising a cross-slide having a lower part movable lengthwise of said axis, and an upper part movable transverse to said axis, said support being mounted on said upper part.
10. An apparatus as defined in claim 3, and further comprising means for varying the spacing between said vertical axis and the orbiting axis of said rollers.
11. An apparatus as defined in claim 3, and further comprising a pivotable lever having a portion engageable with the thin-walled tube on the mandrel for pushing the tube off the mandrel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH10534/78-3 | 1978-10-11 | ||
| CH1053478A CH634238A5 (en) | 1978-10-11 | 1978-10-11 | METHOD AND MACHINE FOR FLOW PRESSING A THIN-WALLED SEAMLESS AND FOLDLESS SHEET PIPE SHEET FROM A SHORT AND THICK-WALLED PIPE SHEET BLANK. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1123381A true CA1123381A (en) | 1982-05-11 |
Family
ID=4364244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA336,443A Expired CA1123381A (en) | 1978-10-11 | 1979-09-26 | Method and apparatus for producing seamless tubes |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0010057B1 (en) |
| CA (1) | CA1123381A (en) |
| CH (1) | CH634238A5 (en) |
| CS (1) | CS216685B2 (en) |
| DD (1) | DD146402A5 (en) |
| DE (1) | DE2964544D1 (en) |
| ES (1) | ES484879A1 (en) |
| FI (1) | FI792882A (en) |
| HU (1) | HU178179B (en) |
| IE (1) | IE49621B1 (en) |
| NO (1) | NO148665C (en) |
| PL (1) | PL218848A1 (en) |
| PT (1) | PT70295A (en) |
| YU (1) | YU231279A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1223306B (en) * | 1987-10-09 | 1990-09-19 | Blm Spa | PROCEDURE AND MACHINE FOR THE PLASTIC DEFORMATION OF TUBULAR BODIES |
| US4989435A (en) * | 1989-12-11 | 1991-02-05 | Kabushiki Kaisha Asahi Kinzoku Hogyosho | Method and apparatus for manufacturing curved pipe |
| US5979202A (en) * | 1997-05-29 | 1999-11-09 | Blakeley Engineering Ltd. | Method and apparatus for making pipe line steel grooved-end fittings |
| US7316142B2 (en) | 2004-05-21 | 2008-01-08 | Lancaster Paul B | Metal spin forming head |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2137864A (en) * | 1935-09-28 | 1938-11-22 | Taylor James Hall | Method of making pipe fittings |
| US2560822A (en) * | 1945-11-08 | 1951-07-17 | Walton S Robinson | Means and method for making seamless pipe elbows |
| DE1289017B (en) * | 1963-10-03 | 1969-02-13 | Lodge And Shipley Company | Centrifugal force absorption of a radially adjustable carrier for a pressure tool during operation |
| US3340713A (en) * | 1965-02-11 | 1967-09-12 | James E Webb | Spin forming tubular elbows |
| FR1540166A (en) * | 1967-10-09 | 1968-09-20 | Zentrale Entwicklung Konstrukt | Device for pressing parts stretched in length with symmetry of revolution |
| DE2714782A1 (en) * | 1977-04-02 | 1978-10-05 | Bertrams Ag | Bender for thin-wall pipes - has mandrel built up from discs to fit in bend during external working by rollers |
-
1978
- 1978-10-11 CH CH1053478A patent/CH634238A5/en not_active IP Right Cessation
-
1979
- 1979-08-21 DE DE7979810071T patent/DE2964544D1/en not_active Expired
- 1979-08-21 EP EP79810071A patent/EP0010057B1/en not_active Expired
- 1979-09-17 FI FI792882A patent/FI792882A/en not_active Application Discontinuation
- 1979-09-24 YU YU02312/79A patent/YU231279A/en unknown
- 1979-09-26 CA CA336,443A patent/CA1123381A/en not_active Expired
- 1979-10-03 DD DD79216001A patent/DD146402A5/en unknown
- 1979-10-04 CS CS796768A patent/CS216685B2/en unknown
- 1979-10-09 HU HU79BA3865A patent/HU178179B/en unknown
- 1979-10-09 PT PT70295A patent/PT70295A/en unknown
- 1979-10-09 NO NO793232A patent/NO148665C/en unknown
- 1979-10-09 IE IE1923/79A patent/IE49621B1/en unknown
- 1979-10-10 PL PL21884879A patent/PL218848A1/xx unknown
- 1979-10-10 ES ES484879A patent/ES484879A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IE791923L (en) | 1980-04-11 |
| EP0010057A1 (en) | 1980-04-16 |
| DD146402A5 (en) | 1981-02-11 |
| PL218848A1 (en) | 1980-06-16 |
| CS216685B2 (en) | 1982-11-26 |
| HU178179B (en) | 1982-03-28 |
| NO793232L (en) | 1980-04-14 |
| ES484879A1 (en) | 1980-04-01 |
| PT70295A (en) | 1979-11-01 |
| EP0010057B1 (en) | 1983-01-19 |
| IE49621B1 (en) | 1985-11-13 |
| FI792882A (en) | 1980-04-12 |
| NO148665C (en) | 1983-11-23 |
| DE2964544D1 (en) | 1983-02-24 |
| YU231279A (en) | 1984-04-30 |
| NO148665B (en) | 1983-08-15 |
| CH634238A5 (en) | 1983-01-31 |
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