WO2024236243A1 - Moule équipé d'un dispositif poussoir amélioré - Google Patents
Moule équipé d'un dispositif poussoir amélioré Download PDFInfo
- Publication number
- WO2024236243A1 WO2024236243A1 PCT/FR2024/050593 FR2024050593W WO2024236243A1 WO 2024236243 A1 WO2024236243 A1 WO 2024236243A1 FR 2024050593 W FR2024050593 W FR 2024050593W WO 2024236243 A1 WO2024236243 A1 WO 2024236243A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mold
- belt
- pusher
- base
- hook axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
- B29C2045/2604—Latching means for successive opening or closing of mould plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
Definitions
- the technical field of the invention is that of molding, and in particular resin transfer molding, using a mold comprising a base, a cover and at least one intermediate wedge located between the base and the cover.
- the present invention relates to a push device capable of moving the base and the belt apart from each other automatically when the pressure which holds the base and the cover against each other is released.
- the material of the molded part has a coefficient of thermal expansion that is different from the coefficient of thermal expansion of the mold material, which generates undesirable stresses in the molded part as it cools. These stresses are likely to damage the part and complicate its demolding, as the molded part may remain stuck in the mold by clamping.
- document FR 3001653 A1 in the name of the applicant and shown in [Fig. 1] and [Fig. 2] discloses a mold 1’ comprising at least one removable shim 3 located between a base 2 and a belt 5 also fulfilling the role of cover for the mold 1’.
- Each shim 3 has an inclined face 4 which slides along a complementary inclined face 6 provided on the belt 5 when the mold 1’ is open.
- the mold 1’ also includes a pusher device 7’ which automatically separates the base 2 and the belt 5 from each other when the pressure holding the base 2 and the belt 5 against each other during molding is released, allowing each shim 3 to slide upwards and laterally away from the molded part 8, to prevent the shims 3 from exerting stress on the molded part 8.
- the pusher device of document FR 3001653 A1 keeps these two parts in the separated position and the mold is therefore in the partially open position.
- the aim of the invention is therefore to provide a modified pusher device, which moves the base and the belt apart from each other automatically when a pressure which held them against each other is released, but which does not move these parts apart before said pressure has been exerted, that is to say which allows the mold to remain in the closed position by gravity when the base and the belt are placed against each other before pressure is exerted on the mold to keep these parts pressed against each other during the injection of the resin.
- the invention provides a solution to the problems discussed above by providing a pusher device comprising two parts which are initially spaced apart when the mold is closed but no pressure has yet been exerted to hold the base and the belt against each other, and which are mutually locked after this pressure has been exerted, so that when the pressure is released the base and the cover are moved apart from each other automatically by the pusher device.
- One aspect of the invention relates to a mold comprising: a base, a removable wedge, a belt, a pusher device capable of moving the base and the belt away from each other automatically, where in the closed position of the mold, the wedge is in vertical support on the base, the belt is in vertical support on said wedge and on the base, the wedge is in lateral support against the belt, and the wedge, the base and the belt delimit a hollow molding volume, in which the pusher device comprises: a first part, designated as a pusher, in vertical support on the base, a second part, designated as a hook axis, movable vertically between a high position in which the hook axis is at a distance above the pusher and a low position in which the hook axis is in support on the pusher, a locking assembly, integral with the belt, which locks the hook axis in the low position, and the pusher comprises a spring which is compressed when the hook axis is in the low position, this spring then exerting a thrust force on the hook
- the mold according to one aspect of the invention may have one or more additional features among the following, considered individually or according to all technically possible combinations:
- the hook axis comprises a vertical shaft extending along an axis Y-Y' substantially parallel to a demolding axis and having a locking surface perpendicular to the axis Y-Y'
- the locking assembly comprises at least one movable part movable between an engagement position and a disengagement position
- the locking assembly comprises a spring which pushes the movable part into the locking position, when the movable part is in the engagement position, the locking surface of the hook axis bears against a face lower part of the movable part of the locking assembly, and when the movable part is in the disengaged position, it is not in contact with the locking surface.
- the outer lateral face of the vertical shaft or an outer face of the movable part of the locking assembly has an inclined ramp forming a sliding ramp between the vertical shaft and the movable part, and the hook axis is movable vertically in an intermediate position located between the high position and the low position and in which the inclined ramp laterally moves the movable part from its unlocking position to its locking position.
- the inclined ramp of the vertical shaft is in the form of a conical or frustoconical part tapering downward and provided at the lower end of the vertical shaft, and the locking surface of the hook axis is an upper face of the conical or frustoconical part.
- the locking assembly comprises two movable parts facing each side of the hook axis and each pushed towards said hook axis by a spring.
- the pusher comprises a lower support piece, a vertically movable upper support piece and a spring elastically deformable between a rest state and a compressed state in which it exerts a thrust force between the two support pieces.
- the lower support piece comprises a tubular part having a hollow volume in the lower part
- the pusher comprises a vertical rod fixed to the upper support piece and slidably mounted in the tubular part, and the height of the hollow volume is greater than the distance traveled by the vertical rod when the spring passes from the rest state to the compressed state.
- the tubular part of the lower support piece has a narrowing in the upper part
- the vertical rod has a shoulder in its lower part, this shoulder being pressed against a lower face of the narrowing of the lower support piece by the thrust force of the spring.
- the upper part of the vertical rod has a threaded part
- the upper support piece comprises a threaded orifice
- the threaded part of the vertical rod is screwed into the threaded orifice of the upper support piece.
- the mold comprises a cover located above the belt, which cover has a through orifice which communicates with the through orifice of the belt, the hook axis being housed in the through orifice of the belt and in the through orifice of the cover, and the upper part of the hook axis extending above the cover when the hook axis is in the high position.
- the base has a recessed housing in which the lower support piece of the pusher is at least partially housed.
- the shim has an inclined face
- the belt has an inclined face
- in the closed position of the mold the inclined face of the shim bears laterally on the inclined face of the belt.
- Another aspect of the invention relates to a molding method using a mold as described above, comprising the following steps: closing the mold; applying pressure to the mold and the pusher device, and changing said pusher device from an unlocked state to a locked state; releasing the pressure on the mold and the pusher device, and automatically moving the base and the belt away from each other by the pusher device; and opening the mold.
- the molding method is a resin transfer molding method.
- the belt is in free support against the base and each shim, and the hook axis is in the high position, which makes it possible in particular to ensure that the reinforcement to be impregnated with resin is well positioned and well immobilized.
- the upper part of the hook axis is forced downwards, which moves the hook axis in low position where it is engaged in locking by the locking assembly and compresses the spring of the pusher device.
- the spring of the pusher device automatically pushes the hook pin upwards, which in turn lifts the belt via the locking assembly, which advantageously allows each wedge to slide upwards and laterally away from the molded part.
- the mold of the invention does not generate undesirable stresses in the part during its molding and the demolding of the finished part is further facilitated.
- FIG. 1 is a schematic cross-sectional profile view of a mold according to the prior art in the partially open position in the absence of pressure to maintain the mold closed.
- FIG. 2 is a view similar to [Fig. 1] where the mold is in the closed position with a pressure force exerted on the mold.
- FIG. 3 is an overall view of a push device according to the invention.
- FIG. 4 is a sectional view of a pusher device of the invention according to section plane IV-IV shown in [Fig. 3].
- FIG. 5 is a schematic cross-sectional profile view of a mold according to the invention in the closed position but without any pressure force being exerted on the mold.
- FIG. 6 is a view similar to [Fig. 5], where the mold is in the closed position with a pressure force exerted on the mold, the pusher device being in the locked position.
- FIG. 10 [Fig. 11] are schematic top sectional views of a pair of half-rings of the pusher device in the closed and open positions.
- FIG. 12 is a schematic sectional view from above of a variant of the pair of half-rings of [Fig. 10].
- the axis Y-Y' is vertical and corresponds substantially to a demolding axis, that is to say an axis along which the different parts of the mold are usually distant from each other when it is opened.
- the mold 1 comprises at least one removable wedge 3 located between a base 2 and a belt 5 intended to hold the wedges 3 in position in the mold 1 when it is closed. It may also comprise a cover 15 provided above the belt 5.
- each shim 3 is in contact with the base 2.
- the belt 5, the shim 3 and the base 2 then delimit a hollow molding volume 38 where a reinforcement can be impregnated with resin to form a molded part 8.
- At least one shim 3 is provided to be partially in contact with the molded part 8.
- This shim preferably has an inclined face 4 which slides preferentially along a complementary inclined face 6 provided on the belt 5 when the mold 1 is opened.
- the inclined face 4 of each shim 3 can also be located in the extension of an inclined face 39 of the base 2.
- the mold 1 according to the invention also comprises a pusher device 7 comprising a pusher 9, a hook axis 10 and a locking assembly 11.
- the hook axis 10 is movable vertically between a high position in which it is at a distance from the pusher 9 and a low position in which it rests on the pusher 9. It comprises a vertical shaft 13 extending along an axis Y-Y’ and has a horizontal locking surface 16.
- the belt 5 has a through orifice 34 through which the hook axis 10 is housed, an upper part of the hook axis 10 extending above the belt 5 when the hook axis 10 is in the high position.
- the mold 1 comprises a cover 15 located above the belt 5, this cover 15 has a through orifice 35 which communicates with the through orifice 34 of the belt 5.
- the hook axis 10 is housed in the through orifice 34 of the belt 5 and in the through orifice 35 of the cover 15, and the upper part of the hook axis 10 extends above the cover 15 when the hook axis 10 is in the high position.
- the locking assembly 11, integral with the belt 5, is designed to lock the hook pin 10 when the latter is in the low position so as to prevent it from rising without this also lifting the belt 5.
- the locking assembly 11 is preferably mounted in a housing 40 extending horizontally in the belt 5. It comprises at least one movable part 17 movable between an engagement position and a disengagement position. In the engagement position, the locking surface 16 of the hook pin 10 is preferably in abutment against a lower face 19 of the movable part 17. In the disengagement position, the movable part 17 is not in contact with the locking surface 16. It can then be at a distance from the vertical shaft 13.
- the locking assembly 11 comprises a spring 18 which tends to push the movable part 17 into the locking position.
- An external lateral face 14 of the vertical shaft 13 or an external face 20 of the movable part 17 of the locking assembly 11 preferably has an inclined ramp 21, 22 forming a sliding ramp between the vertical shaft 13 and the movable part 17 provided so that when the hook axis 10 is in an intermediate position located between the high position and the low position, the ramp inclined 21, 22 laterally moves the movable part 17 from its unlocking position to its locking position by the sliding contact of the vertical shaft 13 against the movable part 17 of the locking assembly 11.
- the inclined ramp 21 of the vertical shaft 13 is preferably in the form of a conical or frustoconical part 23 tapering downwards and provided at the lower end of the vertical shaft 13 and the locking surface 16 of the hook axis 10 is an upper face 24 of the conical or frustoconical part 23.
- the moving part 17 of the locking assembly 11 preferably has an inclined ramp 22, the lower part of which is directed towards the vertical shaft 13.
- the locking assembly 11 preferably comprises two moving parts 17, for example in the form of a half-ring, facing each side of the hook axis 10 to form a ring, and each pushed towards said hook axis 10 by a spring 18, the mutual movement of the two moving parts 17 being preferably guided by a pair of screws 41 screwed into one of the two moving parts 17 and slidably mounted in the other moving part 17.
- the two moving parts 17 are shown in contact in [Fig. 10]-[Fig. 12], and in the spaced apart position in [Fig. 11],
- the pusher 9 preferably comprises a lower support piece 25, a vertically movable upper support piece 26 and a spring 12 elastically deformable between a rest state and a compressed state in which it exerts a thrust force between the two support pieces 25, 26.
- the pusher 9 is supported vertical on the base 2, preferably by means of its lower support piece 25.
- the lower support piece 25 preferably comprises a tubular part 27 having a hollow volume 37 in the lower part
- the pusher 9 comprises a vertical rod 29 fixed to the upper support piece 26 and slidably mounted in the tubular part 27, and the height of the hollow volume 37 allows movement of the vertical rod 29 when the spring 12 passes from the rest state to the compressed state.
- the tubular part 27 of the lower support piece 25 preferably has a narrowing 28 in the upper part, and the vertical rod 29 has a shoulder 30 in its lower part, this shoulder 30 being pressed against a lower face 31 of the narrowing 28 of the lower support piece 25 by the thrust force of the spring 12.
- the upper part of the vertical rod 29 has a threaded part 32
- the upper support piece 26 comprises a threaded orifice 33
- the threaded part 32 of the vertical rod 29 is screwed into the threaded orifice 33 of the upper support piece 26, which makes it possible to adjust the vertical position of the upper support piece 26 relative to the vertical rod 29.
- the lower support piece 25 may bear directly on the base 2 or be at least partially housed in a recess 36 shaped as a hollow in the base 2.
- the mold is in the closed position, without any pressure being exerted on it.
- the hook axis 10 is in the high position, its upper part protrudes upwards outside the mold 1. It is located at a distance from the pusher. Although this is not necessarily necessary, it is shown in contact with the locking assembly 11.
- the spacing of the base 2 and the belt 5 from each other by the pusher device 7 is carried out automatically, for example by a distance of the order of a few millimeters, when the pressure applied to the mold is released. If necessary, this preferentially frees up a space allowing each shim 3 to slide upwards along the inclined contact face 6 of the belt 5 and to slide laterally on the base 2 away from the molded part 8.
- the invention also relates to a molding method, preferably a resin transfer molding method, using a mold 1 according to the invention, and comprising the following steps: closing the mold 1; applying pressure to the mold 1 and the pusher device 7, and switching said pusher device 7 from the unlocked state to the locked state; releasing the pressure on the mold 1 and the pusher device 7, and automatically moving the base 2 and the belt 5 away from each other by the pusher device 7; and opening the mold 1.
- the unlocking mode of the push device 7 depends on the design of the locking assembly 11. 11 is preferably based on an extraction of the hook axis 10 from below when opening the mold, the vertical shaft 13 passing through the ring formed by the moving parts 17.
- the push device it is possible to unlock the push device by moving the moving parts 17 away from the hook axis 10.
- This moving away can be achieved by a magnetic or mechanical device, not shown.
- the unlocking of the push device 7 can for example be achieved by introducing a hollow tube around the vertical shaft 13 in order to come to bear on the inclined ramp 22 of each moving part 17, and to temporarily move them away from the hook axis 10, which allows it to be raised to the high position.
- the same element appearing in different figures has a single reference.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Slide Fasteners (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24729899.5A EP4709566A1 (fr) | 2023-05-12 | 2024-05-06 | Moule équipé d'un dispositif poussoir amélioré |
| CN202480031187.3A CN121194865A (zh) | 2023-05-12 | 2024-05-06 | 配备改进型推顶装置的模具 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FRFR2304737 | 2023-05-12 | ||
| FR2304737A FR3148539B1 (fr) | 2023-05-12 | 2023-05-12 | Moule équipé d’un dispositif poussoir amélioré |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024236243A1 true WO2024236243A1 (fr) | 2024-11-21 |
Family
ID=87748144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2024/050593 Ceased WO2024236243A1 (fr) | 2023-05-12 | 2024-05-06 | Moule équipé d'un dispositif poussoir amélioré |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4709566A1 (fr) |
| CN (1) | CN121194865A (fr) |
| FR (1) | FR3148539B1 (fr) |
| WO (1) | WO2024236243A1 (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4017031A1 (de) * | 1990-05-26 | 1991-12-05 | Konwel Ges Mbh Konstruktions U | Kupplungs- und/oder bewegungs-steuervorrichtung fuer werkzeuge |
| EP0894606A1 (fr) * | 1997-08-01 | 1999-02-03 | Strack Norma GmbH. & Co. KG | Loquet cylindrique |
| US7614873B1 (en) * | 2006-11-29 | 2009-11-10 | Custom Products Enterprises, Inc. | Mold base hold retainer |
| FR3001653A1 (fr) | 2013-02-04 | 2014-08-08 | Snecma | Moule comprenant des coquilles et au moins un tiroir |
| DE102014014211A1 (de) * | 2014-09-23 | 2016-04-07 | Meusburger Georg GmbH & Co. KG | Mitnehmer für Spritz- oder Druckgussformen |
-
2023
- 2023-05-12 FR FR2304737A patent/FR3148539B1/fr active Active
-
2024
- 2024-05-06 EP EP24729899.5A patent/EP4709566A1/fr active Pending
- 2024-05-06 CN CN202480031187.3A patent/CN121194865A/zh active Pending
- 2024-05-06 WO PCT/FR2024/050593 patent/WO2024236243A1/fr not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4017031A1 (de) * | 1990-05-26 | 1991-12-05 | Konwel Ges Mbh Konstruktions U | Kupplungs- und/oder bewegungs-steuervorrichtung fuer werkzeuge |
| EP0894606A1 (fr) * | 1997-08-01 | 1999-02-03 | Strack Norma GmbH. & Co. KG | Loquet cylindrique |
| US7614873B1 (en) * | 2006-11-29 | 2009-11-10 | Custom Products Enterprises, Inc. | Mold base hold retainer |
| FR3001653A1 (fr) | 2013-02-04 | 2014-08-08 | Snecma | Moule comprenant des coquilles et au moins un tiroir |
| DE102014014211A1 (de) * | 2014-09-23 | 2016-04-07 | Meusburger Georg GmbH & Co. KG | Mitnehmer für Spritz- oder Druckgussformen |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3148539B1 (fr) | 2025-06-20 |
| CN121194865A (zh) | 2025-12-23 |
| FR3148539A1 (fr) | 2024-11-15 |
| EP4709566A1 (fr) | 2026-03-18 |
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