Claims
- 1. An extrusion die for manufacturing a tube with a plurality of small hollow portions arranged in a width direction of the tube, said extrusion die comprising;
a female die for defining an outer periphery of the tube; and a mandrel combined with said female die, wherein said mandrel includes a body portion and a comb-shaped portion protruded from said body portion, said comb-shaped portion including a plurality of columnar portions disposed in a width direction of said comb-shaped portion at certain intervals, wherein an outer periphery of a tip end portion of each of said plurality of columnar portions constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube, wherein each of said plurality of columnar portions has outside surfaces opposed in a thickness direction of said comb-shaped portion, and at least one of said outside surfaces has an inwardly dented portion behind said bearing portion, said inwardly dented portion constituting an extrusion material filling space, and wherein said at least one of said outside surfaces extending from a basal end portion of each of said plurality of columnar portions to said inwardly dented portion is formed into an inclined or curved surface for leading extrusion material to said inwardly dented portion, and said at least one of said outside surfaces extending from said dented portion to said bearing portion is formed into an inwardly curved surface.
- 2. The extrusion die for manufacturing a tube with a plurality of small multi hollow portions as recited in claim 1, wherein each of said plurality of columnar portions is provided with a reinforcing rib protruded from a tip end thereof.
- 3. The extrusion die for manufacturing a tube with a plurality of small multi hollow portions as recited in claim 1, wherein a width of said bearing portion is 2.0 mm or less, and wherein a gap between adjacent bearing portions is 0.6 mm or less.
- 4. The extrusion die for manufacturing a tube with a plurality of small multi hollow portions as recited in claim 1, wherein each of said plurality of columnar portions is provided with a groove on said at least one of said outside surfaces of said bearing portion.
- 5. A mandrel to be combined with a female die for regulating an outer periphery of a tube with a plurality of small hollow portions arranged in a width direction of the tube to form an extrusion die for manufacturing the tube,
wherein said mandrel includes a body portion and a comb-shaped portion protruded from said body portion, said comb-shaped portion including a plurality of columnar portions disposed in a width direction of said comb-shaped portion at certain intervals, wherein an outer periphery of a tip end portion of each of said plurality of columnar portions constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube, wherein each of said plurality of columnar portions has outside surfaces opposed in a thickness direction of said comb-shaped portion, and at least one of said outside surfaces has an inwardly dented portion behind said bearing portion, said inwardly dented portion constituting an extrusion material filling space, and wherein said at least one of said outside surfaces extending from a basal end portion of each of said plurality of columnar portions to said inwardly dented portion is formed into an inclined or curved surface for leading extrusion material to said inwardly dented portion, and said at least one of said outside surfaces extending from said dented portion to said bearing portion is formed into an inwardly curved surface.
- 6. The mandrel as recited in claim 5, wherein each of said plurality of columnar portions is provided with a reinforcing rib protruded from a tip end thereof.
- 7. The mandrel as recited in claim 5, wherein a width of said bearing portion is 2.0 mm or less, and wherein a gap between adjacent bearing portions is 0.6 mm or less.
- 8. The mandrel as recited in claim 5, wherein each of said plurality of columnar portions is provided with a groove on said at least one of said outside surfaces of said bearing portion.
- 9. A tube with a plurality of small hollow portions partitioned by partitioning walls in a width direction of said tube, said tube being manufactured by using an extrusion die, wherein said extrusion die comprises:
a female die for defining an outer periphery of the tube; and a mandrel combined with said female die, wherein said mandrel includes a body portion and a comb-shaped portion protruded from said body portion, said comb-shaped portion including a plurality of columnar portions disposed in a width direction of said comb-shaped portion at certain intervals, wherein an outer periphery of a tip end portion of each of said plurality of columnar portions constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube, wherein each of said plurality of columnar portions has outside surfaces opposed in a thickness direction of said comb-shaped portion, and at least one of said outside surfaces has an inwardly dented portion behind said bearing portion, said inwardly dented portion constituting an extrusion material filling space, and wherein said at least one of said outside surfaces extending from a basal end portion of each of said plurality of columnar portions to said inwardly dented portion is formed into an inclined or curved surface for leading extrusion material to said inwardly dented portion, and said at least one of said outside surfaces extending from said dented portion to said bearing portion is formed into an inwardly curved surface.
- 10. The tube as recited in claim 9, wherein each of said plurality of columnar portions is provided with a reinforcing rib protruded from a tip end thereof.
- 11. The tube as recited in claim 9, wherein a width of said hollow portion is 2.0 mm or less, and wherein a thickness of said partitioning wall is 0.6 mm or less.
- 12. The tube as recited in claim 9, wherein said columnar portion is provided with a groove on said at least one of said outside surfaces of said bearing portion, whereby a protrusion is formed between adjacent partitioning walls in said hollow portion.
- 13. A method for manufacturing a heat exchanging tube by extruding extrusion material through an extrusion die, wherein said extrusion die comprises:
a female die for defining an outer periphery of the tube; and a mandrel combined with said female die, wherein said mandrel includes a body portion and a comb-shaped portion protruded from said body portion, said comb-shaped portion including a plurality of columnar portions disposed in a width direction of said comb-shaped portion at certain intervals, wherein an outer periphery of a tip end portion of each of said plurality of columnar portions constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube, wherein each of said plurality of columnar portions has outside surfaces opposed in a thickness direction of said comb-shaped portion, and at least one of said outside surfaces has an inwardly dented portion behind said bearing portion, said inwardly dented portion constituting an extrusion material filling space, and wherein said at least one of said outside surfaces extending from a basal end portion of each of said plurality of columnar portions to said inwardly dented portion is formed into an inclined or curved surface for leading extrusion material to said inwardly dented portion, and said at least one of said outside surfaces extending from said dented portion to said bearing portion is formed into an inwardly curved surface.
- 14. The method for manufacturing a heat exchanging tube as recited in claim 13, wherein each of said plurality of columnar portions is provided with a reinforcing rib protruded from a tip end thereof.
- 15. The method for manufacturing a heat exchanging tube as recited in claim 13, wherein a width of said bearing portion is 2.0 mm or less, and wherein a gap between adjacent bearing portions is 0.6 mm or less.
- 16. The method for manufacturing a heat exchanging tube as recited in claim 13, wherein each of said plurality of columnar portions is provided with a groove on said at least one of said outside surfaces of said bearing portion.
- 17. A heat exchange provided with a heat exchanging tube with a plurality of small hollow portions partitioned by partitioning walls in a width direction of said heat exchanging tube, said heat exchanging tube being manufactured by using an extrusion die, wherein said extrusion die comprises:
a female die for defining an outer periphery of the tube; and a mandrel combined with said female die, wherein said mandrel includes a body portion and a comb-shaped portion protruded from said body portion, said comb-shaped portion including a plurality of columnar portions disposed in a width direction of said comb-shaped portion at certain intervals, wherein an outer periphery of a tip end portion of each of said plurality of columnar portions constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube, wherein each of said plurality of columnar portions has outside surfaces opposed in a thickness direction of said comb-shaped portion, and at least one of said outside surfaces has an inwardly dented portion behind said bearing portion, said inwardly dented portion constituting an extrusion material filling space, and wherein said at least one of said outside surfaces extending from a basal end portion of each of said plurality of columnar portions to said inwardly dented portion is formed into an inclined or curved surface for leading extrusion material to said inwardly dented portion, and said at least one of said outside surfaces extending from said dented portion to said bearing portion is formed into an inwardly curved surface.
- 18. The heat exchanger as recited in claim 17, wherein each of said plurality of columnar portions is provided with a reinforcing rib protruded from a tip end thereof.
- 19. The heat exchanger as recited in claim 17, wherein a width of said bearing portion is 2.0 mm or less, and wherein a gap between adjacent bearing portions is 0.6 mm or less.
- 20. The heat exchanger as recited in claim 17, wherein a fin portion is protruded between adjacent partitioning walls in each of said plurality of small hollow portions.
- 21. A method for manufacturing a heat exchanger by brazing heat exchanging tubes and outer fins arranged alternatively, each of said heat exchanging tube having a plurality of small hollow portions partitioned by partitioning walls in a width direction of said heat exchanging tube, said heat exchanging tube being manufactured by a die,
wherein said die comprises: a female die for defining an outer periphery of the tube; and a mandrel combined with said female die, wherein said mandrel includes a body portion and a comb-shaped portion protruded from said body portion, said comb-shaped portion including a plurality of columnar portions disposed in a width direction of said comb-shaped portion at certain intervals, wherein an outer periphery of a tip end portion of each of said plurality of columnar portions constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube, wherein each of said plurality of columnar portions has outside surfaces opposed in a thickness direction of said comb-shaped portion, and at least one of said outside surfaces has an inwardly dented portion behind said bearing portion, said inwardly dented portion constituting an extrusion material filling space, and wherein said at least one of said outside surfaces extending from a basal end portion of each of said plurality of columnar portions to said inwardly dented portion is formed into an inclined or curved surface for leading extrusion material to said inwardly dented portion, and said at least one of said outside surfaces extending from said dented portion to said bearing portion is formed into an inwardly curved surface.
- 22. The method for manufacturing a heat exchanger as recited in claim 21, wherein each of said plurality of columnar portions is provided with a reinforcing rib protruded from a tip end thereof.
- 23. The method for manufacturing a heat exchanger heat exchanger as recited in claim 21, wherein a width of said hollow portion is 2.0 mm or less, and wherein a thickness of said partitioning wall is 0.6 mm or less.
- 24. The method for manufacturing a heat exchanger as recited in claim 21, wherein said fin portion is protruded between adjacent partitioning walls in each of said plurality of small hollow portions.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2001-325592 |
Oct 2001 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to Japanese Patent Application No. 2001-325592 filed on Oct. 23, 2001 and U.S. Provisional Application No. 60/341,247 filed on Dec. 20, 2001, the disclosure of which is incorporated by reference in its entirety.
[0002] This application is an application filed under 35 U.S.C. §111(a) claiming the benefit pursuant to 35 U.S.C. §119(e)(1) of the filing date of Provisional Application No. 60/341,247 filed on Dec. 20, 2001 pursuant to 35 U.S.C. §111(b).
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP02/10955 |
10/22/2002 |
WO |
|
Provisional Applications (1)
|
Number |
Date |
Country |
|
60341247 |
Dec 2001 |
US |