JPS57139424A - Manufacture of elbow provided with straight pipe part - Google Patents
Manufacture of elbow provided with straight pipe partInfo
- Publication number
- JPS57139424A JPS57139424A JP2718081A JP2718081A JPS57139424A JP S57139424 A JPS57139424 A JP S57139424A JP 2718081 A JP2718081 A JP 2718081A JP 2718081 A JP2718081 A JP 2718081A JP S57139424 A JPS57139424 A JP S57139424A
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- bending
- straight pipe
- equal
- pipe
- 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
Classifications
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
- B21D7/025—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member and pulling or pushing the ends of the work
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
PURPOSE:To obtain a titled elbow whose strength is excellent, without generating an elliptical shape, by bending an original pipe which has been formed so that thickness of a part positioned in the bending center side is equal to thickness of a straight pipe part, and the opposite side from this part is gradually increased in thickness, by means of heating using a high frequency current. CONSTITUTION:As for an original pipe 1, its inside diameter is equal in its axial length direction, also its outside diameter is equal in its axial length direction in both straight pipe parts 12, 12, and its thickness is also uniform in its circumferential direction in both the straight pipe parts 12, 12. According to this constitution, in the center part of a bending allowance part 11 in the original pipe 1, thickness of a part (a) positioned most adjacently to the bending center (o) side in the circumferential wall of the web side is equal to that of the straight pipe part 12, the thickness is gradually increased as the part goes away from the bending center (o) in the circumferential direction from said part (a), and the thickness becomes maximum in a part (b) positioned most far away from the bending center (o). Said original pipe 1 is held by a tale stock 3, also is fixed to an arm 5, and is bent by heating a bending part of the original pipe 1, making a high frequency current flow to an induction cold 4, and providing a thrust through the tale stock 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2718081A JPS57139424A (en) | 1981-02-25 | 1981-02-25 | Manufacture of elbow provided with straight pipe part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2718081A JPS57139424A (en) | 1981-02-25 | 1981-02-25 | Manufacture of elbow provided with straight pipe part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57139424A true JPS57139424A (en) | 1982-08-28 |
Family
ID=12213873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2718081A Pending JPS57139424A (en) | 1981-02-25 | 1981-02-25 | Manufacture of elbow provided with straight pipe part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57139424A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1203624A2 (en) * | 2000-11-06 | 2002-05-08 | Zambelli -Fertigungs-GmbH | Method for the production of parts for a roof drainage system, in particular pipe bends |
-
1981
- 1981-02-25 JP JP2718081A patent/JPS57139424A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1203624A2 (en) * | 2000-11-06 | 2002-05-08 | Zambelli -Fertigungs-GmbH | Method for the production of parts for a roof drainage system, in particular pipe bends |
| EP1203624A3 (en) * | 2000-11-06 | 2003-01-02 | Zambelli -Fertigungs-GmbH | Method for the production of parts for a roof drainage system, in particular pipe bends |
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