Claims
- 1. A method of producing a pipe with a partition, comprising the steps of:
- shaping a flat sheet into such a configuration that said sheet has a pair of half-cylindrical portions arranged in juxtaposed relation to each other and interconnected by a connecting portion disposed between said pair of half-cylindrical portions, and that a partition-forming portion of a U-shaped cross-section is formed on each of said pair of half-cylindrical portions, and is projected from an inner surface thereof;
- removing at least that portion of said connecting portion lying between said partition-forming portions of said pair of half-cylindrical portions;
- compressing each of said partition-forming portions from opposite sides thereof to form a half partition portion;
- bending said connecting portion to bring said pair of half-cylindrical portions into opposed relation to each other;
- mating said pair of opposed half-cylindrical portions with each other; and
- bonding said pair of mated half-cylindrical portions together.
- 2. The method of claim 1, wherein said flat sheet comprises an aluminum sheet having a brazing material layer formed thereon, and in said bonding step, said pair of half cylindrical portions, as well as said half partition portions, are brazed together.
- 3. The method of claim 1, further comprising the step 2 of forming tube insertion holes in one of said pair of half-cylindrical portions.
- 4. The method of claim 3, wherein said flat sheet comprises an aluminum sheet having a brazing material layer formed thereon, and in said bonding step, said pair of half cylindrical portions, as well as said half partition portions, are brazed together.
- 5. The method of claim 1, further comprising the steps of cutting a slit in an end of one of said partition-forming portions and flaring said cut end outwardly to form a flared portion, another of said partition-portions being received in said flared portion.
- 6. The method of claim 1, further comprising the steps of forming a first set of projections in an outer side edge of one of said half-cylindrical portions and a second set of projections in another of said half-cylindrical portions in an alternating manner, said first and second sets of projections respectively mating with the opposed cylindrical portions.
- 7. The method of claim 1, wherein edges of said half-cylindrical portions are bent in an L-shape.
- 8. A method of producing a header with a partition, comprising the steps of:
- shaping a flat sheet to form a first header member which has a first half-cylindrical portion, and a partition portion of a generally U-shaped cross-section projected from an inner surface of said half-cylindrical portion;
- forming a second header member, said second header member-forming step comprising the steps of (i) shaping a flat sheet to form a second half-cylindrical portion having a partition-forming portion of a U-shaped cross-section projected from an inner surface thereof, (ii) removing at least those portions of opposite side edge portions of said second half-cylindrical portion disposed respectively at opposite ends of said partition-forming portion, (iii) compressing said partition-forming portion from opposite sides thereof to form a half partition portion, and (iv) forming tube insertion holes in said second half-cylindrical portion; and
- bonding said first and second header members together.
- 9. A method of producing a header with a partition, comprising the steps of:
- forming a first header member, said first header member-forming step comprising the steps of (i) shaping a flat sheet to form a first half-cylindrical portion having a first partition-forming portion of a generally U-shaped cross-section projected from an inner surface thereof, (ii) removing at least those portions of opposite side edge portions of said half-cylindrical portion disposed respectively at opposite ends of said partition-forming portion, (iii) compressing said partition-forming portion from opposite sides thereof to form a first half partition portion;
- forming a second header member, said second header member-forming step comprising the steps of (iv) shaping a flat sheet to form a second half-cylindrical portion having a second partition-forming portion of a U-shaped cross-section projected from an inner surface thereof, (v) removing at least those portions of opposite side edge portions of said second half-cylindrical portion disposed respectively at opposite ends of said second partition-forming portion, (vi) compressing said second partition-forming portion from opposite sides thereof to form a second half partition portion, and (vii) forming tube insertion holes in said second half-cylindrical portion; and
- joining said first and second header members together to form a header having a pipe-like configuration.
- 10. The method of claim 9, further comprising the steps of cutting a slit in an end of said first partition-forming portion and flaring said cut end outwardly to form a flared portion, said second partition-portion being received in said flared portion.
- 11. The method of claim 9, further comprising the steps of forming a first set of projections in an outer side edge of said first half-cylindrical portion and a second set of projections in said second half-cylindrical portion in an alternating manner, said first and second sets of projections respectively mating with said second half-cylindrical portion and said first half-cylindrical portion.
- 12. The method of claim 9, wherein edges of said first and second half-cylindrical portions are bent in an L-shape.
- 13. A method of producing an end-closed pipe in which an end portion is closed, comprising the steps of:
- shaping a flat sheet into such a configuration that said sheet has a pair of half-cylindrical portions arranged in juxtaposed relation to each other and interconnected by a connecting portion disposed between said pair of half-cylindrical portions, and that a closure-forming portion of a U-shaped cross-section is formed on each of said pair of half-cylindrical portions at the end thereof, and is projected from an inner surface thereof;
- removing at least that portion of said connecting portion lying between said closure-forming portions of said pair of half-cylindrical portions;
- compressing each of said closure-forming portions from opposite sides thereof to form a half closure portion;
- bending said connecting portion to bring said pair of half-cylindrical portions into opposed relation to each other;
- mating said pair of opposed half-cylindrical portions with each other; and
- bonding said pair of mated half-cylindrical portions together.
- 14. The method of claim 13, wherein said flat sheet comprises an aluminum sheet having a brazing material layer formed thereon, and in said bonding step, said pair of half cylindrical portions, as well as said half closure portions, are brazed together.
- 15. The method of claim 13, further comprising the step of forming tube insertion holes in one of said pair of half-cylindrical portions.
- 16. The method of claim 14, wherein said flat sheet comprises an aluminum sheet having a brazing material layer formed thereon, and in said bonding step, said pair of half cylindrical portions, as well as said half partition portions, are brazed together.
- 17. The method of claim 13, wherein said half closure portions are formed at both end portions of each of said pair of half-cylindrical portions to close both end portions of said end-closed pipe.
- 18. The method of claim 13, further comprising the steps of cutting away an outside portion of said closure-forming portion to remove a needless portion.
- 19. The method of claim 17, further comprising the steps of forming a partition between both end of said end-closed pipe in accordance with the same steps of shaping, removing and compressing.
- 20. A method of producing a header of which end portion is closed, comprising the steps of:
- shaping a flat sheet to form a first header member which has a first half-cylindrical portion, and a closure portion of a generally U-shaped cross-section projected from an inner surface of said half-cylindrical portion;
- forming a second header member, said second header member-forming step comprising the steps of (i) shaping a flat sheet to form a second half-cylindrical portion having a closure-forming portion of a U-shaped cross-section projected from an inner surface thereof, (ii) removing at least those portions of opposite side edge portions of said second half-cylindrical portion disposed respectively at opposite ends of said closure-forming portion, (iii) compressing said closure-forming portion from opposite sides thereof to form a half closure portion, and (iv) forming tube insertion holes in said second half-cylindrical portion; and
- bonding said first and second header members together.
- 21. The method of claim 20, wherein said flat sheet is shaped in such a manner that said first half-cylindrical portion has said closure portions at both end portions thereof and said second half-cylindrical portion has said half closure portions at both end portions thereof, so as to close both end portions of said header.
- 22. The method of claim 20, further comprising the steps of cutting away an outside portion of said closure portion and half closure portion to remove a needless portion.
- 23. The method of claim 21, further comprising the steps of forming a partition between both ends of said end-closed pipe in accordance with the same steps (i) to (iii).
- 24. A method of producing a header of which end portion is closed, comprising the steps of:
- forming a first header member, said first header member-forming step comprising the steps of (i) shaping a flat sheet to form a first half-cylindrical portion having a first closure-forming portion of a generally U-shaped cross-section projected from an inner surface thereof, (ii) removing at least those portions of opposite side edge portions of said half-cylindrical portion disposed respectively at opposite ends of said closure-forming portion, (iii) compressing said closure-forming portion from opposite sides thereof to form a first half closure portion;
- forming a second header member, said second header member-forming step comprising the steps of (iv) shaping a flat sheet to form a second half-cylindrical portion having a second closure-forming portion of a U-shaped cross-section projected from an inner surface thereof, (v) removing at least those portions of opposite side edge portions of said second half-cylindrical portion disposed respectively at opposite ends of said second closure-forming portion, (vi) compressing said second closure-forming portion from opposite sides thereof to form a second half closure portion, and (vii) forming tube insertion holes in said second half-cylindrical portion; and
- joining said first and second header members together to form a header having a pipe-like configuration.
- 25. The method of claim 24, wherein said flat sheet is shaped in such a manner that said first half-cylindrical portion has said first closure-forming portions at both end portions thereof and said second half-cylindrical portion has said second closure-forming portions at both end portions thereof, so as to close both end portions of said header.
- 26. The method of claim 24, further comprising the steps of cutting away an outside portion of said first and second closure-forming portions to remove a needless portion.
- 27. The method of claim 25, further comprising the steps of forming a partition between both end of said end-closed pipe in accordance with the same steps (i) to (iv).
Priority Claims (2)
Number |
Date |
Country |
Kind |
6-059176 |
Mar 1994 |
JPX |
|
7-229927 |
Sep 1995 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 08/412,454, filed Mar. 29, 1995, now abn, which is hereby incorporated by reference in its entirety.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5119552 |
Sutou et al. |
Jun 1992 |
|
5348083 |
Hosoya et al. |
Sep 1994 |
|
5363911 |
Velluet et al. |
Nov 1994 |
|
5386629 |
Ouchi et al. |
Feb 1995 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
63-279094 |
Nov 1988 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
412454 |
Mar 1995 |
|