Method of shaping container bodies and corresponding apparatus
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B21D-022/26
B21D-026/02
출원번호
UP-0578297
(2005-04-13)
등록번호
US-7726162
(2010-06-22)
우선권정보
EP-04356053(2004-04-16)
국제출원번호
PCT/EP2005/005206
(2005-04-13)
§371/§102 date
20061013
(20061013)
국제공개번호
WO05/099926
(2005-10-27)
발명자
/ 주소
Druesne, Guy
Verboom, Cornelis
출원인 / 주소
Impress Group B.V.
대리인 / 주소
Young & Thompson
인용정보
피인용 횟수 :
3인용 특허 :
11
초록▼
Method wherein a) a container (1, 6) is placed in a two halves mould (2) having an internal shaped wall (21), b) an internal pressure P of a fluid is build up so as to shape the skirt (12), is characterized in that an external pressure P′of a fluid is applied in an upper space (101) contiguou
Method wherein a) a container (1, 6) is placed in a two halves mould (2) having an internal shaped wall (21), b) an internal pressure P of a fluid is build up so as to shape the skirt (12), is characterized in that an external pressure P′of a fluid is applied in an upper space (101) contiguous to an external or upper surface (100) of the open top end (10) and/or in a lower space (141) contiguous to an external or lower surface (140) of the shaped bottom end (14), so as to have, during the span of time Δt, a pressure difference ΔP|P−P′1 low enough to prevent any distortion of the shaped open top end (10) and/or the shaped bottom end (14), so as to form a shaped metallic container (1′, 6′). An apparatus for carring out the method is also disclosed.
대표청구항▼
The invention claimed is: 1. A method of reshaping a skirt (12) of a hollow metallic container (1, 6) to form a shaped metallic container (1′, 6′), the hollow metallic container (1, 6) having a top end (10) with an opening (11), and a bottom end (14), the method comprising the steps o
The invention claimed is: 1. A method of reshaping a skirt (12) of a hollow metallic container (1, 6) to form a shaped metallic container (1′, 6′), the hollow metallic container (1, 6) having a top end (10) with an opening (11), and a bottom end (14), the method comprising the steps of: placing said container (1, 6) in a two halves mould (2) having an internal shaped wall (21); building an internal pressure P of a first fluid during a span of time Δt within said hollow container to form a cavity (15) and to expand said skirt (12) against said shaped wall (21) such that said skirt is shaped by said shaped wall, said shaped wall (21) having an internal surface (210) defining a lateral space (211); and during said building step, applying an external pressure P′ of a second fluid in any of i) an upper space (101) contiguous to an external surface (100) of said top end (10) and ii) a lower space (141) contiguous to an external surface (140) of said bottom end (14), so as to have, during said span of time Δt, a pressure difference ΔP =|P−′| wherein a distortion of a shape of said top end (10) and/or a shape of said bottom end (14) is prevented as said first pressurized fluid acts upon said skirt (12). 2. The method according to claim 1, wherein upper and lower separating means are used to prevent communication and pressure equalization between each of said lateral space (211) and any of said upper space (211) and said lower space (141) in order to minimize a pressure difference between said cavity (15) and any of said upper space (101) and said lower space (141). 3. The method according to claim 2, wherein compressed air is applied in each of said cavity (15), said upper space (101), and said lower space (141). 4. The method according to claim 2, wherein said internal pressure P is generated by operating a lower piston (3) to enter said cavity (15) through said opening (11) so as to compress the first fluid within said cavity (15), and said pressure P′ being provided be an auxiliary pressure supplier. 5. The method according to claim 2, wherein said upper space (101) and said lower space (141) are kept at a same pressure so as to have a same pressure difference i) between said cavity (15) and said upper space (101) and ii) between said cavity (15) and said lower space (141) during said span of time Δt. 6. The method according to claim 5, wherein the a pipe connects said upper space (101) and said lower space (141) to maintain the same pressure. 7. The method according to claim 1, wherein a compressed fluid is applied in each of said cavity (15), said upper space (101), and said lower space (141) at a same pressure P. 8. The method according to claim 1, wherein said internal pressure P is generated by operating a lower piston (3) to enter said cavity (15) through said opening (11) so as to compress the first fluid within said cavity (15), and said external pressure P′ being provided be an auxiliary pressure supplier. 9. The method according to claim 8, wherein said auxiliary pressure supplier uses compressed air, and includes a device configured to equalize pressures P and P′ during said span of time Δt. 10. The method according to claim 8, wherein said lower piston (3) is a lower part of an upper piston (4), said upper piston (4) configured to move inside an upper compression body (52) of a press (5) with an upper compression cavity (520), so as to form said auxiliary pressure supplier providing said external pressure P′. 11. The method according to claim 10, wherein said upper space (101) is part of said upper compression cavity (520). 12. The method according to claim 10, wherein a first compression ratio of a first internal volume (V1) of said cavity (15) absent said lower piston and a second internal volume (V2) of said cavity (15) with said lower piston extended into said cavity (15), and a second compression ratio of a first internal volume (V′1) of said upper compression cavity absent said upper piston and a second internal volume (V′2) of said upper compression cavity with said upper piston extended into the upper compression cavity are such that 0.8<(V′1×V2)/(V′2×V1)<1.2. 13. The method according to claim 12, wherein said first compression ratio and said second compression ratio are such that 0.9<(V′1×V2)/(V′2×V1)<1.1. 14. The method according to claim 1, wherein the first fluid is air. 15. The method according to claim 1, wherein the lateral space (211) is maintained at atmospheric pressure. 16. The method according to claim 1, wherein the second fluid is air. 17. The method according to claim 1, wherein the hollow metallic container is aluminum with a thickness of 0.2 mm, and said pressure difference ΔP is less than 0.05 MPa. 18. The method according to claim 1, wherein the hollow metallic container is steel with a thickness of 0.17 mm, and said pressure difference ΔP is less than 0.05 Mpa. 19. An apparatus, for reshaping a skirt (12) of a hollow container (1) having a bottom end (14) and a top end (10) with an opening (11), comprising: a mould (2) comprised of two halves, the two halves forming a lateral space (211) bounded by an internal shaped wall (21), said mould (2) and shaped wall (21) being configured to the size of said skirt (12) of said hollow container (1, 6); means for supplying a first fluid in a cavity (15) inside said hollow container (1, 6) with an internal pressure P such that the first fluid causes said skirt (12) to expand against said shaped wall (21); auxiliary means for supplying a second fluid in an upper space (101) contiguous to an external surface (100) of said top end (10) and a lower space (141) contiguous to an external surface (140) of said bottom end (14), said auxiliary means configured to supply the second fluid at an external pressure P′ such that a pressure difference ΔP=|P−′| prevents a distortion of a shape of said top end (10) and a shape of said bottom end (14), when said first pressurized fluid acts upon said skirt (12); and upper and lower means configured to prevent a pressure equalizing between said lateral space (211) and said upper and lower spaces (101, 141). 20. The apparatus according to claim 19, further comprising: means to equalize pressure between said upper space and said lower space. 21. The apparatus according to claim 20, wherein said means for supplying the first fluid comprises a lower piston (3) configured to move axially in said cavity (15) through said opening (11) to compress the first fluid inside said cavity (15). 22. The apparatus according to claim 20, wherein said means to equalize pressure between said upper space and said lower space is a duct connecting said upper space (101) and said lower space (141). 23. The apparatus according to claim 19, wherein said means for supplying the first fluid in said cavity (15) comprises a lower piston (3) configured to move axially in said cavity (15) through said opening (11) to compress the first fluid inside said cavity (15). 24. The apparatus according to claim 19, wherein auxiliary means for supplying a second fluid comprises an upper piston (4) configured to move in an upper compression cavity (520) above said mould (2), the upper piston (4) to compress the second fluid. 25. The apparatus according to claim 24, wherein said lower piston (3) has a diameter such that a clearance between said lower piston (3) and said opening (11) enables free movement of said lower piston (3) through said opening (11). 26. The apparatus according to claim 24, wherein said lower piston (3) cooperates with said opening (11) with a clearance high enough to allow for a pressure equalization between said cavity (15) and said upper compression cavity (520). 27. The apparatus according to claim 24, wherein said lower piston (3) is connected to said upper piston (4), said lower piston (3) configured to move with said upper piston (4), both of said upper and lower pistons (3, 4) configured to move with a same axial displacement H during a compression cycle. 28. The apparatus according to claim 27 wherein, a first compression ratio of a first internal volume (V1) of said cavity (15) absent said lower piston and a second internal volume (V2) of said cavity (15) with said lower piston extended into said cavity (15), and a second compression ratio of a first internal volume (V′1) of said upper compression cavity absent said upper piston and a second internal volume (V′2) of said upper compression cavity with said upper piston extended into the upper compression cavity are such that 0.8<(V′1×V2)/(V′2×V1)<1.2. 29. The apparatus according to claim 28, wherein said first compression ratio and said second compression ratio are such that 0.9<(V′1×V2)/(V′2×V1)<1.1. 30. The apparatus according to claim 19, wherein said upper and lower means includes a mobile ring (55) bearing. 31. The apparatus according to claim 30, wherein the mobile ring (55) is a sealing ring (550). 32. The apparatus according to claim 19, wherein the shaped wall (21) includes lateral apertures (212) configured to maintain the lateral space (211) at atmospheric pressure. 33. The apparatus according to claim 19, wherein the upper and lower means are an upper ring (53) and a lower base (54). 34. The apparatus according to claim 19, wherein the first pressurized fluid is air. 35. The apparatus according to claim 19, wherein the second pressurized fluid is air.
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