A method of press molding a molding material to form a molded part of fiber-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mold tool having a lower mold part and an upper mold part, the upper mold part having a first molding surface for molding a first
A method of press molding a molding material to form a molded part of fiber-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mold tool having a lower mold part and an upper mold part, the upper mold part having a first molding surface for molding a first molded surface of the molded part and the lower mold part having a second molding surface for molding a second molded surface of the molded part; ii. providing a multilaminar panel of molding material comprising at least one layer of dry fibers and at least one layer of resin, the multilaminar panel having first and second opposite major surfaces; iii. locating the molding material in the mold tool; iv. progressively closing the mold tool to define a substantially closed mold cavity containing the molding material, the closing step having: I. a first stage prior to both the first molding surface contacting the first major surface and the second molding surface contacting the second major surface andII. a second compression stage after both the first molding surface has contacted the first major surface and the second molding surface has contacted the second major surface, the second compression stage causing resin impregnation of the dry fibers, the closure speed of relative movement between the lower and upper mold parts being higher in the first stage than in the second compression stage; v. applying pressure to the molding material in the mold cavity to configure the molding material in a fully molded shape; and vi. substantially fully curing the resin to form a molded part from the molding material.
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1. A method of press moulding a moulding material to form a moulded part of fibre-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mould tool having a lower mould part and an upper mould part, the upper mould part having a first moulding surface for moul
1. A method of press moulding a moulding material to form a moulded part of fibre-reinforced resin matrix composite material, the method comprising the steps of: i. providing a mould tool having a lower mould part and an upper mould part, the upper mould part having a first moulding surface for moulding a first moulded surface of the moulded part and the lower mould part having a second moulding surface for moulding a second moulded surface of the moulded part;ii. providing a multilaminar panel of moulding material comprising at least one layer of dry fibres and at least one layer of resin, the multilaminar panel having first and second opposite major surfaces;iii. locating the moulding material in the mould tool;iv. progressively closing the mould tool to define a substantially closed mould cavity containing the moulding material, the closing step having: e. a first stage prior to both the first moulding surface contacting the first major surface and the second moulding surface contacting the second major surface andf. a second compression stage after both the first moulding surface has contacted the first major surface and the second moulding surface has contacted the second major surface, the second compression stage causing resin impregnation of the dry fibres,the closure speed of relative movement between the lower and upper mould parts being higher in the first stage than in the second compression stage, wherein in the second compression stage the closure speed is from 0.2 to 2 mm/second and the second compression stage lasts for a period of from 1 to 20 seconds;v. applying pressure to the moulding material in the mould cavity to configure the moulding material in a fully moulded shape; andvi. substantially fully curing the resin to form a moulded part from the moulding material. 2. A method according to claim 1 wherein the first stage I of the closing step iv includes the sub-steps of: a. partially closing the mould tool to define a closed intermediate cavity containing the moulding material, the closed intermediate cavity being larger than the moulded part and the first moulding surface of the upper mould part being spaced from the first major surface by a spacing distance, the upper mould part being at an elevated temperature as compared to the temperature of the moulding material; andb. at least partially evacuating air from the closed intermediate cavity at least while the first moulding surface of the upper mould part is spaced from the first major surface. 3. A method according to claim 2 wherein the evacuating step b creates in the closed intermediate cavity a vacuum pressure of below 100 mbar, optionally below 50 mbar, further optionally about 10 mbar, between the lower mould part and the upper mould part. 4. A method according to claim 3 wherein the closed intermediate cavity is held at the vacuum pressure for a period of from 1 second to 5 minutes, optionally from 3 seconds to 2 minutes, further optionally from 10 seconds to 60 seconds. 5. A method according to claim 3 wherein, for at least a part of a period that the closed intermediate cavity is at the vacuum pressure, the spacing distance is from 1 to 100 mm, optionally from 1 to 50 mm, further optionally from 2 to 50 mm, still further optionally from 10 to 40 mm. 6. A method according to claim 1 wherein prior to the closing step iv the lower and upper mould parts are initially separate, and at an end of a preliminary closing phase in the closing step iv the lower and upper mould parts are mutually engaged to define an initial cavity containing the moulding material. 7. A method according to claim 6 wherein at the end of the preliminary closing phase a vacuum seal is engaged between the lower mould part and the upper mould part. 8. A method according to claim 7 wherein the vacuum seal is engaged when the first moulding surface of the upper mould part is spaced from the first major surface by a distance of from 10 to 100 mm. 9. A method according to claim 7 wherein after the initial cavity has been formed the mould tool is continuously closed to form the substantially closed mould cavity. 10. A method according to claim 7 wherein after the initial cavity has been formed the mould tool is discontinuously closed, there being a dwell period at the spacing distance. 11. A method according to claim 1 wherein a dry fibre layer of the multilaminar panel forms the second major surface, in the locating step iii the second major surface is disposed on the second moulding surface of the lower mould part, and the lower mould part is at an elevated temperature as compared to the temperature of the moulding material, and after the applying pressure step v resin in the multilaminar panel fully impregnates the dry fibres. 12. A method according to claim 1 wherein the closing step iv includes: a preliminary closing phase to achieve mutual engagement between the lower and upper mould parts,a secondary closing phase after engagement between the lower and upper mould parts with the mould tool partially closed to define a closed intermediate cavity containing the moulding material, the closed intermediate cavity being larger than the moulded part and the first moulding surface of the upper mould part being spaced from the first major surface by a spacing distance, in the secondary closing phase air being at least partially evacuated from the closed intermediate cavity while the first moulding surface of the upper mould part is spaced from the first major surface to provide a vacuum pressure; anda tertiary closing phase after the vacuum pressure has been provided in the closed intermediate cavity, the tertiary phase having the first and second stages. 13. A method according to claim 12 wherein the preliminary closing phase takes less than 20 seconds. 14. A method according to claim 13 wherein at an end of the preliminary closing phase a vacuum seal is engaged between the lower mould part and the upper mould part. 15. A method according to claim 14 wherein the vacuum seal is engaged when the first moulding surface of the upper mould part is spaced from the first major surface by a distance of from 10 to 100 mm. 16. A method according to claim 1 wherein the method includes successive moulding cycles for moulding successive moulded parts and the locating step iii of a later cycle directly follows a removing step viii of an earlier cycle. 17. A method according to claim 16 wherein in the locating step iii of the later cycle the mould tool is at a temperature which is within +/−10° C. of the mould tool temperature during the removing step viii of the earlier cycle. 18. A method according to claim 1 wherein a vacuum pressure is applied during the closing step iv and the pressure applying step v. 19. A method according to claim 18 wherein the vacuum pressure is released during the curing step vi. 20. A method according to claim 1 wherein the method forms a vehicle body panel of fibre-reinforced resin matrix composite material, the vehicle body panel having a front A-surface and a rear B-surface, the mould tool is heated and the first moulding surface moulds a front A-surface of the vehicle body panel and the second moulding surface moulds a rear B-surface of the vehicle body panel, the vehicle body panel having a front A-surface formed from the first major surface and a rear B-surface formed from the second major surface. 21. A method according to claim 1 wherein the moulding material further comprises a syntactic layer comprising a polymer matrix and a plurality of hollow particles distributed within the polymer matrix. 22. A method according to claim 21 wherein the syntactic layer is a core layer between first and second dry fibre layers. 23. A method according to claim 22 wherein in the locating step iii the moulding material drapes by bending about a neutral axis substantially centrally located with respect to the thickness of the moulding material, the neutral axis being located within the syntactic layer. 24. A method according to any claim 1 wherein the resin comprises a thermosetting resin, optionally an epoxy resin. 25. A method according to any claim 1 wherein in the locating step iii the moulding material is heated to cause the viscosity of the resin initially to decrease as a result of an increase in resin temperature and then to increase as a result of initiation of curing prior to step vi. 26. A method according claim 1 wherein in the locating step iii the second major surface is draped onto the second moulding surface. 27. A method according to claim 1 wherein the locating step iii to the curing step vi are carried out at an elevated temperature above the curing temperature of the resin. 28. A method according to claim 1 wherein in the locating step iii a reduced pressure is applied to the mould cavity to increase a drape of the moulding material. 29. A method according claim 1 wherein in the moulding material a layer of carbon fibres is adjacent to a respective layer of resin. 30. A method according to claim 29 wherein the moulding material comprises a syntactic core layer between a first carbon fibre layer and a second dry glass fibre layer defining the second major surface, each fibre layer being adjacent to a layer of resin. 31. A method according to claim 30 wherein a surface resin layer is on the first major surface of the moulding material and is adjacent to the first carbon fibre layer. 32. A method according to claim 1 wherein the moulding material comprises a surface resin layer, a syntactic core layer, a carbon fibre layer and a first resin layer between the surface resin layer and the syntactic core layer, a dry glass fibre layer defining the second major surface, and a second resin layer between the syntactic core layer and the dry glass fibre layer. 33. A method according to claim 1 wherein the first moulding surface faces substantially downwardly and the second moulding surface faces substantially upwardly. 34. A method according to claim 1 wherein the moulding material located in the mould tool in the locating step iii has a greater thickness than the moulded part and the closing step iv compresses the moulding material in the substantially closed mould cavity prior to the applying pressure step v. 35. A method according to claim 1 wherein in the moulding material the at least one layer of resin comprises thermosetting resin and the at least one layer of fibres comprises a woven fabric of carbon or glass fibres, optionally at least one or each woven fabric being substantially unimpregnated with any resin. 36. A method according to claim 1 wherein in the moulding material the at least one layer of resin is adjacent to the at least one layer of dry fibres, optionally at least one or each layer of dry fibres being substantially unimpregnated with any resin. 37. A method according to claim 1 wherein the moulding material does not comprise a sheet moulding compound (SMC).
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이 특허에 인용된 특허 (3)
Hara Takahisa (Kawanishi JPX) Matsumoto Masahito (Osaka JPX) Nakada Hitoshi (Kibi-gun JPX), Method for producing a multilayer molded article.
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