IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0484911
(2001-07-27)
|
등록번호 |
US-7785519
(2010-09-20)
|
국제출원번호 |
PCT/IT2001/000412
(2001-07-27)
|
§371/§102 date |
20040127
(20040127)
|
국제공개번호 |
WO03/012311
(2003-02-13)
|
발명자
/ 주소 |
- Pacchiana, Giovanni Paolo
- Goller, Ralf Siegfried
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
9 |
초록
▼
A mould for moulding braking bands with ventilation ducts with the use of composite material and, in particular, of C/SiC ceramic material, comprises two half-moulds with respective impression surfaces which face one another and lie perpendicular to an axis of symmetry and which, together with outer
A mould for moulding braking bands with ventilation ducts with the use of composite material and, in particular, of C/SiC ceramic material, comprises two half-moulds with respective impression surfaces which face one another and lie perpendicular to an axis of symmetry and which, together with outer and inner cylindrical walls, define a moulding cavity in the shape of the braking band to be moulded. The mould also has pin elements which have the shape of the ventilation ducts and which can be transferred by secondary actuating means from a rest position to a working position and vice versa, the pin elements being outside the moulding cavity in the rest position and the pin elements being inserted in the moulding cavity in the working position.
대표청구항
▼
What is claimed is: 1. A mould for moulding braking bands of composite material, with ventilation ducts, the mould comprising: a. a substantially cylindrical housing comprising an inner edge and an outer edge; and having two half-moulds, each half-mould having an impression surface, the impression
What is claimed is: 1. A mould for moulding braking bands of composite material, with ventilation ducts, the mould comprising: a. a substantially cylindrical housing comprising an inner edge and an outer edge; and having two half-moulds, each half-mould having an impression surface, the impression surfaces facing one another, lying substantially perpendicular to an axis of symmetry; at least one of the half-moulds being slidably movable by means of respective principal actuating means along the axis of symmetry towards the other half-mould for producing a predetermined pressure suitable for the moulding of the braking band, b. an inner, substantially cylindrical wall having an inner edge and an outer edge; c. wherein said housing and inner wall are concentric with one another; and together with the two half-moulds, said housing and inner wall defining a moulding cavity without apertures during producing of said predetermined pressure in order to avoid addition of said composite material during movement of the two half-moulds and while the two half-moulds are closed to form said closed cavity; d. one or more pin elements which can form the ventilation ducts and which can be transferred by secondary actuating means from a rest position to a working position and from the working position to the rest position, respectively, in which the pin elements do not interfere with the moulding cavity in the rest position, and the pin elements intersect the moulding cavity in the working position, and when the pin elements are in the work position, they lie substantially in a plane perpendicular to the axis of symmetry, halfway between the impression surface of the two half-moulds; e. wherein said pin elements extend through the inner and outer edge of the housing; through the moulding cavity; and through the inner and outer edge of the inner wall when they are in the work position; and said pins do not extend through the moulding cavity or the inner or outer edge of the inner wall when they are in the rest position. 2. A mould according to claim 1 in which the pin elements are associated with the secondary actuating means. 3. A mould according to claim 2 in which the pin elements have respective rear ends and respective front ends which are tapered relative to the rear ends to facilitate the insertion of the pin elements forwards into the moulding cavity by their front ends during their transfer from the rest position to the working position and to facilitate the extraction of the pin elements from the moulded braking band during their transfer from the working position to the rest position. 4. A mould according to claim 3 in which the impression surfaces of the half-moulds have a substantially annular shape with an outer edge and an inner edge and the containment means comprise a substantially cylindrical outer wall and a substantially cylindrical inner wall, the outer and inner walls extending about the axis of symmetry and being associated with the outer edges and with the inner edges of the impression surfaces, respectively. 5. A mould according to claim 1 in which the containment means have through-holes suitable for constituting inlets and outlets for the pin elements during their transfer from the rest position to the working position and from the working position to the rest position, respectively. 6. A mould according to claim 1 in which the containment means are associated with the pin elements and are moved together therewith, defining the moulding cavity only when the pin elements are in the working position. 7. A mould according to claim 1 in which one or more containment means are integral with the pin elements and are moved together therewith, defining the moulding cavity only when the pin elements are in the working position. 8. A mould according to claim 1 in which, in the working position, the front end of a first pin element has a tapered, prismatic, final portion which is fitted in a respective prismatic cavity formed in the front end of a second pin element. 9. A mould according to claim 8 in which the prismatic, final portion is fitted only partially in the prismatic cavity, forming a ventilation duct with a peripheral projection. 10. A mould according to claim 1 in which, in the working position, the pin elements are inserted in the moulding cavity, extending from the outer wall to the inner wall and are distributed at substantially regular intervals around the moulding cavity. 11. A mould according to claim 10 in which the pin elements are substantially straight and are arranged radially relative to the axis of symmetry, forming substantially straight and radial ventilation ducts in the braking band. 12. A mould according to claim 10 in which the pin elements extend along substantially straight axes which are inclined to radial directions, with respect to the axis of symmetry, forming, in the braking band, substantially straight ventilation ducts which are inclined to radial directions, with respect to the axis of symmetry. 13. A mould according to claim 10 in which the pin elements have a substantially arcuate shape, forming arcuate ventilation ducts in the braking band. 14. A mould according to claim 9 in which the pin elements have cross-sections which are tapered from the outer wall towards the inner wall so as to form ventilation ducts which are tapered from the outer boundary of the braking band towards its inner boundary. 15. A mould according to claim 14 in which the pin elements have cross-sections which are tapered from the outer wall towards the inner wall so as to form, in the braking band, connecting walls having substantially uniform cross-sections. 16. A mould according to claim 1 in which the pin elements have a substantially circular shape in cross-section. 17. A mould according to claim 1 in which the pin elements have a substantially oval shape in cross-section. 18. A mould according to claim 1 in which the pin elements have a substantially polygonal shape in cross-section. 19. A mould according to claim 1 in which the secondary actuating means comprise one or more hydraulic piston/cylinder units. 20. A mould according to claim 1 in which the secondary actuating means comprise one or more pneumatic piston/cylinder units. 21. A mould according to claim 1 in which the secondary actuating means comprise linear motors. 22. A mould according to claim 1 in which the secondary actuating means comprise geared transmissions. 23. A mould according to claim 1 in which the principal actuating means comprise one or more hydraulic piston/cylinder units. 24. A mould according to claim 1 in which the principal actuating means comprise one or more pneumatic piston/cylinder units. 25. A mould according to claim 1 in which the principal actuating means comprise a linear motor. 26. A mould according to claim 1, made of aluminium or aluminium alloy. 27. A mould according to claim 1 comprising heating means. 28. A mould according to claim 27 in which the heating means comprise electrical resistors. 29. A mould according to claim 1, enveloped in a layer of thermally-insulating material. 30. A mould according to claim 1 in which, in the working position, the front ends of at least two of the pin elements meet inside the moulding cavity forming, in the braking band, ventilation ducts the outlets of which are enlarged in comparison with their inner portions. 31. The mould according to claim 1 wherein the housing has two circular openings each having a diameter. 32. The mould according to claim 31 wherein the two half-moulds comprise an operating rod having a diameter and a plate, wherein the diameter of the operating rod is less than the diameters of the circular openings. 33. A mould according to claim 1 wherein the inner wall is positioned in a recess formed in between the moulds, and held in position by a support means. 34. A mould according to claim 1, wherein four or more pins elements are arranged in a radial pattern. 35. The mould according to claim 34 wherein the two half-moulds comprise an operating rod having a diameter and a plate, wherein the diameter of the operating rod is less than the diameters of the circular openings. 36. A method of producing a braking band of composite material, with ventilation ducts, comprising the following steps: providing a substantially cylindrical housing comprising an inner edge and an outer edge and having two half-moulds, each half-mould having an impression surface, the impression surfaces facing one another, lying substantially perpendicular to an axis of symmetry, at least one of the half-moulds being slidably movable by means of respective principal actuating means along an axis of symmetry towards the other half-mould for producing a predetermined pressure suitable for the moulding of the braking band; providing an inner, substantially cylindrical wall having an inner edge and an outer edge; wherein said housing and inner wall are concentric with one another; positioning the two half-moulds, housing, and inner wall so that they define a moulding cavity without apertures during producing of said predetermined pressure in order to avoid addition of said composite material during movement of the two half moulds; transferring the pin elements from a rest position to a working position; wherein said pin elements extend through the inner and outer edge of the housing; through the moulding cavity; and through the inner and outer edge of the inner wall when they are in the work position; and said pins do not extend through the moulding cavity or the inner or outer edge of the inner wall when they are in the rest position; filling the interior of the moulding cavity of the mould with a mixture of composite material; moulding the braking band around the pin elements by applying a predetermined pressure by slidably moving at least one of the half-moulds of said mould along the axis of symmetry towards the other half mould and by applying a predetermined temperature avoiding the addition of further material during the application of said predetermined pressure or while the mould is closed; transferring the pin elements from the working position to the rest position, extracting them from the semi-finished braking band; ejecting the braking band from the mould. 37. A method according to claim 36, further comprising the step of pyrolysis of the braking band. 38. A method according to claim 37, further comprising the step of silication of the braking band. 39. A method according to claim 38, further comprising one or more steps for the mechanical finishing of the outer surfaces of the braking band. 40. The mould according to claim 36 wherein the housing has two circular openings each having a diameter. 41. A mould according to claim 40 wherein the inner wall is positioned in a recess formed in between the moulds, and held in position by a support means. 42. A mould according to claim 36, wherein four or more pins elements are arranged in a radial pattern. 43. The mould according to claim 41 wherein the two half-moulds comprise an operating rod having a diameter and a plate, wherein the diameter of the operating rod is less than the diameters of the circular openings. 44. A mould according to claim 42 wherein the inner wall is positioned in a recess formed in between the moulds, and held in position by a support means. 45. A method of producing a braking band of composite material, with ventilation ducts, comprising the following steps: providing a substantially cylindrical housing comprising an inner edge and an outer edge; and a mould having two half-moulds, each half-mould having an impression surface, the impression surfaces facing one another, lying substantially perpendicular to an axis of symmetry, at least one of the half-moulds being slidably movable by means of respective principal actuating means along an axis of symmetry towards the other half-mould for producing a predetermined pressure suitable for the moulding of the braking band; providing an inner, substantially cylindrical wall having an inner edge and an outer edge; wherein said housing and inner wall are concentric with one another; positioning the two half-moulds, housing, and inner wall so that they define a moulding cavity without apertures during producing of said predetermined pressure in order to avoid addition of said composite material during movement of the two half moulds; depositing one or more layers of a mixture of composite material in the moulding cavity of the mould; transferring the pin elements from a rest position to a working position; wherein said pin elements extend through the inner and outer edge of the housing; through the moulding cavity; and through the inner and outer edge of the inner wall when they are in the work position; and said pins do not extend through the moulding cavity or the inner or outer edge of the inner wall when they are in the rest position; depositing one or more layers of a mixture of composite material in the moulding cavity of the mould; moulding the braking band around the pin elements by applying a predetermined pressure by slidably moving at least one of the half-moulds of said mould along the axis of symmetry towards the other half mould and by applying a predetermined temperature avoiding the addition of further material during the application of said predetermined pressure or while the mould is closed; transferring the pin elements from the working position to the rest position, extracting them from the semi-finished braking band; ejecting the braking band from the mould. 46. The method of claim 45, wherein after the moulding cavity has been filled with a predetermined quantity of material, the mould is closed by a coupling of the two mould portions. 47. The method of claim 45 wherein the front ends of at least two of the pin elements meet inside the moulding cavity forming, in the braking band, ventilation ducts the outlets of which are enlarged in comparison with their inner portions. 48. The mould according to claim 45 wherein the housing has two circular openings each having a diameter. 49. A mould according to claim 45, wherein four or more pins elements are arranged in a radial pattern.
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