BE1006261A5 - Manufacture of articles plastic. - Google Patents
Manufacture of articles plastic. Download PDFInfo
- Publication number
- BE1006261A5 BE1006261A5 BE9200943A BE9200943A BE1006261A5 BE 1006261 A5 BE1006261 A5 BE 1006261A5 BE 9200943 A BE9200943 A BE 9200943A BE 9200943 A BE9200943 A BE 9200943A BE 1006261 A5 BE1006261 A5 BE 1006261A5
- Authority
- BE
- Belgium
- Prior art keywords
- mold
- formation
- segments
- juxtaposition
- pair
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
- B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/26—Seam welding of rectilinear seams
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- 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
- B29C33/52—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 soluble or fusible
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/114—Single butt joints
- B29C66/1142—Single butt to butt joints
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/128—Stepped joint cross-sections
- B29C66/1282—Stepped joint cross-sections comprising at least one overlap joint-segment
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/128—Stepped joint cross-sections
- B29C66/1284—Stepped joint cross-sections comprising at least one butt joint-segment
- B29C66/12841—Stepped joint cross-sections comprising at least one butt joint-segment comprising at least two butt joint-segments
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/14—Particular design of joint configurations particular design of the joint cross-sections the joint having the same thickness as the thickness of the parts to be joined
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
- B29C66/322—Providing cavities in the joined article to collect the burr
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
- B29C66/547—Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles, e.g. endless tubes
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/61—Joining from or joining on the inside
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1632—Laser beams characterised by the way of heating the interface direct heating the surfaces to be joined
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1687—Laser beams making use of light guides
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
- B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
- B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
- B29C66/73941—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset characterised by the materials of both parts being thermosets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/757—Moulds, cores, dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Plasma & Fusion (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
La fabrication d'un objet en matière plastique moulée implique l'utilisation d'un moule en plusieurs segments (10, 11) qui définit au moins en partie une cavité de moulage (16). Avant le moulage de la matière plastique, on positionne les segments de moule (10, 11) dans une orientation préslectionnée les uns par rapport aux autres. Une région marginale (14) de surfaces de juxtaposition (12, 13; 22, 23) des segments est munie d'une formation intégrante (14; 25) de matière fusible. Cette formation est soumise à l'action de l'énergie d'un faisceau laser pour fondre la formation de manière à l'unir avec la matière voisine pour relier les segments.The production of a molded plastic object involves the use of a mold in several segments (10, 11) which at least partially defines a mold cavity (16). Before molding the plastic material, the mold segments (10, 11) are positioned in a pre-selected orientation with respect to each other. A marginal region (14) of juxtaposition surfaces (12, 13; 22, 23) of the segments is provided with an integral formation (14; 25) of fusible material. This formation is subjected to the action of the energy of a laser beam to melt the formation so as to unite it with the neighboring material to connect the segments.
Description
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Fabrication d'objets en matière plastique.
La présente invention concerne la fabrication d'objets en matière plastique et, en particulier mais pas exclusivement, la fabrication d'objets par un procédé du type"à noyau perdu" dans lequel on moule une matière plastique à l'aide du noyau de moule fusible pouvant être éliminé par fusion, qui peut être du type à plusieurs segments et, après le moulage, on élimine le noyau de moule en le chauffant jusqu'à un état fondu dans lequel il peut s'écouler hors d'une cavité qui est ainsi définie par la matière plastique moulée.
Une difficulté qui surgit fréquemment lors de la fabrication d'objets en matière plastique par une technique de moulage est le fait que des formations parasites, par exemple des lignes de bavure de matière en surplus, sont formées à proximité du point d'injection de la matière dans le moule. Ces formations parasites apparaissent également en d'autres endroits sur l'objet s'il est moulé à l'aide d'un moule du type à plusieurs segments.
Lors de la fabrication de produits de mécanique de précision, l'élimination des lignes de bavure et d'autres formations parasites doit être effectuée avec soin et augmente, par conséquent, le temps et les frais de fabrication. L'élimination est particulièrement difficile si les formations sont situées sur des surfaces relativement inacessibles de l'objet moulé, ce qui se produit lorsque l'objet de forme complexe est moulé par une technique à noyau perdu à l'aide d'un moule en plusieurs segments.
La difficulté d'éliminer des protubérances parasites est moins grande si l'on choisit des matières plastiques d'un type particulier, par exemple des matières plastiques thermodurcissables. Cependant, pour de nombreux produits, les caractéristiques relativement cassantes et le coût élevé des matières plastiques thermodurcissables, comparativement par exemple aux matières thermoplastiques,
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rendent les matières plastiques thermodurcissables inadéquates.
L'invention a pour but de procurer un procédé permettant d'éviter ou d'atténuer la difficulté précitée due à la présence de formations parasites traditionnellement associées à la fabrication de produits en matière plastique et spécialement en matière plastique thermoplastique.
Suivant l'un de ses aspects, l'invention procure un procédé pour la fabrication d'un objet en matière plastique moulée impliquant l'utilisation d'un moule en matière fusible à plusieurs segments qui définit au moins en partie une cavité pour le moulage de la matière plastique, dans lequel, avant le moulage de la matière plastique, on positionne les segments du moule dans une orientation présélectionnée les uns par rapport aux autres et on soumet des régions marginales de surface de juxtaposition des segments à l'action de l'énergie d'un faisceau laser pour unir les segments du moule au moins au niveau des régions marginales et éliminer toutes les formations parasites dans ces régions marginales.
L'invention procure, en outre, un procédé suivant lequel au moins une des régions marginales est pourvue d'une formation à nervure parasite qui se comporte comme une source de matière de remplissage lorsqu'elle est chauffée par le faisceau laser, pour remplir de petits interstices entre les surfaces de juxtaposition des segments de moule et faciliter l'obtention d'un joint à surface lisse.
Une des surfaces de juxtaposition peut être pourvue d'une formation d'about déformable qui se déforme d'une manière préférentielle lorsque les surfaces de juxtaposition sont pressées l'une vers l'autre de manière à effectuer en substance un scellement entre elles. La formation d'about peut s'étendre dans le sens longitudinal, peut de préférence être longitudinalement continue et est de préférence disposée à proximité d'une des régions marginales qui doit être soumise à l'action de l'énergie du
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faisceau laser. La formation qui s'étend dans le sens longitudinal peut être rectiligne et/ou courbe.
Suivant un autre de ses aspects, l'invention procure un procédé pour la fabrication d'un objet en matière plastique moulée, dans lequel on forme un objet en matière plastique moulée par une technique connue en soi qui crée une formation parasite sur l'objet, cet article étant alors soumis à de l'énergie provenant d'un faisceau laser dirigé vers la formation parasite. Le faisceau laser peut être utilisé pour éliminer la formation parasite par sectionnement ou pour la faire fondre en vue de la fusionner avec la matière voisine formant le corps de l'objet en matière plastique.
L'invention envisage en particulier que la matière plastique soit d'un type thermoplastique. Cependant, des matières thermodurcissables peuvent également être utilisées.
Le faisceau d'énergie laser est de préférence dirigé vers la surface de l'objet en matière plastique ou du moule à plusieurs segments dans une direction en substance perpendiculaire soit à la surface de l'objet en matière plastique, au voisinage de la formation parasite, soit à la surface du moule, au voisinage d'une région marginale localisée.
Le faisceau d'énergie laser peut être obtenu d'une manière connue et peut avantageusement être désaccordé lorsque, comme c'est habituellement le cas, un faible niveau d'énergie fournie est requis. Pour réaliser un joint lisse entre deux segments d'un moule à plusieurs segments et ainsi éviter des irrégularités superficielles dans les régions de juxtaposition de l'objet moulé, il est particulièrement préférable de faire usage d'une impulsion laser conformée, en vue d'éviter un afflux initial d'énergie pendant chaque impulsion.
L'invention prévoit, en outre, que, dans une paire de segments de moule en matière fusible comportant des
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surfaces respectives destinées à être juxtaposées l'une à l'autre après assemblage pour définir au moins partiellement un moule, une des surfaces soit pourvue d'une zone de réception (par exemple une rainure ou une feuillure) au niveau d'un bord, qui est exposée lorsque les surfaces de juxtaposition sont en contact, et l'autre surface soit pourvue, au niveau d'un bord exposé de manière analogue, d'une nervure de remplissage, de sorte que l'énergie laser appliquée à la nervure de remplissage et au voisinage de celle-ci force la matière parasite de la nervure de remplissage à s'écouler dans la zone de réception et à la remplir.
Les deux segments de moule peuvent être unis l'un à l'autre par la matière qui s'écoule dans la zone de réception.
L'invention prévoit également que, dans une paire de segments de moule en matière fusible comportant des surfaces respectives destinées à être juxtaposées l'une à l'autre lorsqu'elles sont assemblées pour définir au moins partiellement un moule, au moins une des surfaces est pourvue d'une formation d'about déformable propre à se déformer lorsque les surfaces sont pressées l'une vers l'autre. La formation d'about est de préférence en substance continue dans le sens longitudinal de manière à être à même de fournir un scellement en substance continu entre les surfaces de juxtaposition lorsqu'elles sont pressées l'une vers l'autre. La formation d'about est de préférence prévue sur la surface de juxtaposition à un endroit proche d'un bord de cette surface qui doit être soumis à l'action de l'énergie de faisceau laser.
Il n'est pas essentiel que les deux segments de moule soient unis au niveau d'une région marginale exposée ou ne soient unis qu'à cet endroit. Les segments de moule peuvent être soumis à une technique de soudage profond au cours die laquelle les surfaces de juxtaposition sont soudées l'une à l'autre à un endroit situé à l'intérieur du corps de la matière de moule, en dessous de la région marginale
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exposée.
Des formes de réalisation de l'invention seront décrites ci-après, à titre d'exemple, avec référence au dessin annexé, dans lequel : la Fig. 1 est une vue en perspective d'une paire de segments de moule conforme à l'invention, et la Fig. 2 est une vue en perspective d'une paire de segments de moule conforme à une autre forme de réalisation de l'invention.
La Fig. 1 illustre deux segments de moule identiques 10,11 à unir l'un à l'autre par un procédé conforme à l'invention. Chaque segment de moule 10,11 est d'une forme tubulaire en substance semi-cylindrique et comprend deux faces 12,13 destinées à être juxtaposées aux faces de l'autre segment. Un segment 10 est pourvu de régions faciales 12 dont les bords radialement intérieurs sont pourvus chacun d'une formation à nervure parasite 14 de la matière du segment de moule. Les faces 13 de l'autre segment de moule 11 sont pourvues de feuillures longitudinales 15, également au niveau de leurs bords radialement intérieurs.
Lorsque les deux segments de moule sont assemblés dans la configuration illustrée au dessin annexé, un faisceau d'énergie laser est dirigé vers chaque nervure de remplissage 14, typiquement au moyen d'un dispositif à fibres optiques, qui peut s'étendre à travers l'alésage 16 délimité par les deux segments. Le dispositif à fibres optiques est infléchi de telle façon que le faisceau d'énergie laser soit dirigé radialement vers l'extérieur dans une direction en substance perpendiculaire à la région superficielle localisée d'une paire de bords exposés des faces de juxtaposition. Le niveau d'énergie est réglé de manière à faire en sorte que la matière de la nervure de remplissage 14 s'écoule dans la feuillure voisine 15 qui sert de zone de réception pour cette matière.
Le niveau de chaleur appliqué est suffisant pour ramollir la matière
<Desc/Clms Page number 6>
moulée qui définit une feuillure longitudinale 15, avec pour résultat que la matière de la nervure de remplissage forme une jonction entre les segments de moule.
Le procédé que l'on vient de décrire est effectué sur une nervure de remplissage et une feuillure orientée verticalement vers le haut, de sorte que la matière de la nervure de remplissage a naturellement tendance à s'écouler dans la feuillure. Par la suite, les deux segments de moule étant maintenus par des moyens extérieurs (non représentés) dans la position relative requise, on fait tourner les segments de 1800 autour de l'axe longitudinal de l'alésage 16 et on applique le procédé précité à l'autre nervure de remplissage et à l'autre feuillure.
On obtient ainsi un moule présentant un alésage en substance sans joint et dans lequel un objet peut être moulé sans créer de lignes de bavure ou d'autres formations parasites qui, normalement, seraient formées si l'on faisait usage d'un simple moule comprenant deux segments semi-cylindriques directement maintenus en contact.
Il n'est pas essentiel que les nervures de remplissage 14 soient dirigées radialement vers l'intérieur.
Dans une variante du procédé décrit ci-dessus, les nervures de remplissage 14 peuvent être prévues aux bords radialement extérieurs des régions faciales de manière à être dirigées radialement vers l'extérieur, les feuillures 15 étant alors ménagées dans les bords radialement extérieurs des faces 13.
La Fig. 2 illustre deux segments de moule 20,21, chacun d'une forme tubulaire en substance semi-cylindrique et comprenant une paire de faces 22,23 destinées à être juxtaposées aux faces de l'autre segment. Un segment 21 comporte deux faces 23 pourvues chacune, à proximité de leur bord radialement interne 24, d'une petite formation d'about déformable 25 qui fait partie intégrante de la matière du segment et qui s'étend de manière continue sur cette face parallèlement à l'axe longitudinal du segment. Les faces 22 de l'autre segment 20 sont planes.
<Desc/Clms Page number 7>
En service, les deux segments sont pressés l'un contre l'autre pour amener les formations d'about 25 à se déformer contre les faces de juxtaposition 23 de l'autre segment et à tendre à s'enfoncer dans celles-ci. Un contact continu est, par conséquent, établi entre les deux paires de surfaces de juxtaposition, ce qui contribue à assurer qu'un faisceau d'énergie laser appliqué ultérieurement soit facilement à même de former des soudures continues entre les surfaces juxtaposées de chaque paire.
Les segments de moule peuvent être en un alliage métallique à bas point de fusion, par exemple du plomb- étain-antimoine ou de l'étain-bismuth, et peuvent être réutilisés après la fusion visant à les enlever d'un objet en matière plastique moulée. Le procédé conforme à l'invention ne fait pas usage d'une quelconque matière autre que celle des segments de noyau de moule pour assurer l'assemblage de ces segments en vue de leur utilisation en tant que moule et la matière du noyau de moule est, par conséquent, facilement disponible en vue d'une réutilisation sans élimination de matières contaminantes qui pourrait s'avérer nécessaire si, par exemple, une technique de collage ou de soudage était utilisée pour assembler les deux segments.
Lorsque l'invention est appliquée à l'élimination de formations parasites d'un objet en matière plastique, cet objet peut être prefaçonne avec un renfoncement proche d'une région de l'objet ou une ligne de bavure ou une formation parasite semblable tend à se former, de sorte que le faisceau d'énergie laser peut être utilisé pour amener la formation parasite à s'écouler dans le renfoncement et à être reçu par celui-ci. En variante, le faisceau d'énergie laser peut être utilisé pour éliminer la ligne de bavure par une opération de coupe.
<Desc / Clms Page number 1>
Manufacture of plastic objects.
The present invention relates to the manufacture of plastic objects and, in particular but not exclusively, the manufacture of objects by a process of the "lost core" type in which a plastic material is molded using the mold core. meltable fuse, which can be of the multi-segment type and, after molding, the mold core is removed by heating it to a molten state in which it can flow out of a cavity which is thus defined by molded plastic.
A difficulty which frequently arises in the manufacture of plastic objects by a molding technique is the fact that parasitic formations, for example burr lines of surplus material, are formed near the injection point of the material in the mold. These parasitic formations also appear in other places on the object if it is molded using a mold of the type with several segments.
When manufacturing precision mechanical products, the removal of burr lines and other parasitic formations must be done with care and therefore increases manufacturing time and costs. Removal is particularly difficult if the formations are located on relatively inaccessible surfaces of the molded object, which occurs when the object of complex shape is molded by a lost-core technique using a mold. several segments.
The difficulty in eliminating parasitic protuberances is less great if one chooses plastics of a particular type, for example thermosetting plastics. However, for many products, the relatively brittle characteristics and the high cost of thermosetting plastics, compared for example to thermoplastics,
<Desc / Clms Page number 2>
make thermosetting plastics unsuitable.
The object of the invention is to provide a method making it possible to avoid or attenuate the aforementioned difficulty due to the presence of parasitic formations traditionally associated with the manufacture of plastic products and especially of thermoplastic plastic.
According to one of its aspects, the invention provides a method for manufacturing a molded plastic object involving the use of a mold made of fusible material with several segments which at least partially defines a cavity for molding of plastic material, in which, before molding the plastic material, the segments of the mold are positioned in a pre-selected orientation with respect to each other and subjecting marginal regions of juxtaposition surface of the segments to the action of the energy of a laser beam to unite the mold segments at least at the marginal regions and eliminate all the parasitic formations in these marginal regions.
The invention further provides a method in which at least one of the marginal regions is provided with a parasitic rib formation which behaves as a source of filling material when heated by the laser beam, for filling with small gaps between the juxtaposition surfaces of the mold segments and facilitate obtaining a smooth surface joint.
One of the juxtaposition surfaces can be provided with a deformable end formation which deforms in a preferential manner when the juxtaposition surfaces are pressed towards each other so as to effect a substantial sealing between them. The butt formation can extend in the longitudinal direction, can preferably be longitudinally continuous and is preferably arranged near one of the marginal regions which must be subjected to the action of the energy of the
<Desc / Clms Page number 3>
laser beam. The formation which extends in the longitudinal direction can be rectilinear and / or curved.
According to another of its aspects, the invention provides a method for manufacturing a molded plastic object, in which a molded plastic object is formed by a technique known per se which creates a parasitic formation on the object. , this article then being subjected to energy coming from a laser beam directed towards the parasitic formation. The laser beam can be used to eliminate parasitic formation by sectioning or to melt it in order to merge it with the neighboring material forming the body of the plastic object.
The invention envisages in particular that the plastic material is of a thermoplastic type. However, thermosetting materials can also be used.
The laser energy beam is preferably directed towards the surface of the plastic object or of the multi-segment mold in a direction substantially perpendicular either to the surface of the plastic object, in the vicinity of the parasitic formation. , or on the surface of the mold, in the vicinity of a localized marginal region.
The laser energy beam can be obtained in a known manner and can advantageously be detuned when, as is usually the case, a low level of supplied energy is required. To make a smooth joint between two segments of a mold with several segments and thus avoid surface irregularities in the regions of juxtaposition of the molded object, it is particularly preferable to make use of a shaped laser pulse, in order to avoid an initial inflow of energy during each pulse.
The invention further provides that, in a pair of mold segments of fusible material having
<Desc / Clms Page number 4>
respective surfaces intended to be juxtaposed to each other after assembly to at least partially define a mold, one of the surfaces is provided with a receiving zone (for example a groove or a rebate) at an edge, which is exposed when the juxtaposition surfaces are in contact, and the other surface is provided, at a similarly exposed edge, with a filling rib, so that the laser energy applied to the rib of filling and in the vicinity thereof forces the parasitic material from the filling rib to flow into the receiving zone and to fill it.
The two mold segments can be joined to each other by the material flowing in the receiving area.
The invention also provides that, in a pair of mold segments of fusible material comprising respective surfaces intended to be juxtaposed with each other when they are assembled to define at least partially a mold, at least one of the surfaces is provided with a deformable end formation capable of deforming when the surfaces are pressed towards each other. The butt formation is preferably substantially continuous in the longitudinal direction so as to be able to provide a substantially continuous seal between the juxtaposition surfaces when pressed against each other. The butt formation is preferably provided on the juxtaposition surface at a location near an edge of this surface which is to be subjected to the action of laser beam energy.
It is not essential that the two mold segments be united at an exposed marginal region or only be united there. The mold segments may be subjected to a deep welding technique in which the juxtaposition surfaces are welded to each other at a location inside the body of the mold material, below the marginal region
<Desc / Clms Page number 5>
exposed.
Embodiments of the invention will be described below, by way of example, with reference to the accompanying drawing, in which: FIG. 1 is a perspective view of a pair of mold segments according to the invention, and FIG. 2 is a perspective view of a pair of mold segments according to another embodiment of the invention.
Fig. 1 illustrates two identical mold segments 10, 11 to be joined to one another by a method according to the invention. Each mold segment 10, 11 is of a tubular, substantially semi-cylindrical shape and comprises two faces 12, 13 intended to be juxtaposed to the faces of the other segment. A segment 10 is provided with facial regions 12 whose radially inner edges are each provided with a parasitic rib formation 14 of the material of the mold segment. The faces 13 of the other mold segment 11 are provided with longitudinal rebates 15, also at their radially inner edges.
When the two mold segments are assembled in the configuration illustrated in the accompanying drawing, a beam of laser energy is directed towards each filling rib 14, typically by means of a fiber optic device, which can extend through the bore 16 delimited by the two segments. The fiber optic device is flexed such that the laser energy beam is directed radially outward in a direction substantially perpendicular to the localized surface region of a pair of exposed edges of the juxtaposition faces. The energy level is adjusted so that the material of the filling rib 14 flows into the adjacent rebate 15 which serves as a reception area for this material.
The level of heat applied is sufficient to soften the material
<Desc / Clms Page number 6>
molded which defines a longitudinal rebate 15, with the result that the material of the filling rib forms a junction between the mold segments.
The process just described is carried out on a filling rib and a rebate oriented vertically upwards, so that the material of the filling rib naturally tends to flow in the rebate. Subsequently, the two mold segments being held by external means (not shown) in the required relative position, the segments of 1800 are rotated around the longitudinal axis of the bore 16 and the above method is applied to the other filling rib and the other rebate.
A mold is thus obtained having a substantially seamless bore and in which an object can be molded without creating burr lines or other parasitic formations which would normally be formed if a simple mold comprising two semi-cylindrical segments directly held in contact.
It is not essential that the filling ribs 14 are directed radially inwards.
In a variant of the method described above, the filling ribs 14 can be provided at the radially outer edges of the facial regions so as to be directed radially outward, the rebates 15 then being formed in the radially outer edges of the faces 13 .
Fig. 2 illustrates two mold segments 20, 21, each of a tubular shape that is substantially semi-cylindrical and comprising a pair of faces 22, 23 intended to be juxtaposed with the faces of the other segment. A segment 21 has two faces 23 each provided, near their radially internal edge 24, with a small deformable end formation 25 which is an integral part of the material of the segment and which extends continuously on this face in parallel to the longitudinal axis of the segment. The faces 22 of the other segment 20 are planar.
<Desc / Clms Page number 7>
In service, the two segments are pressed against each other to cause the end formations 25 to deform against the juxtaposition faces 23 of the other segment and to tend to sink into them. Continuous contact is therefore established between the two pairs of juxtaposition surfaces, which helps to ensure that a beam of laser energy subsequently applied is easily able to form continuous welds between the juxtaposed surfaces of each pair.
The mold segments can be made of a metal alloy with a low melting point, for example lead-tin-antimony or tin-bismuth, and can be reused after melting to remove them from a plastic object molded. The process according to the invention does not make use of any material other than that of the mold core segments to ensure the assembly of these segments for use as a mold and the material of the mold core is , therefore, readily available for re-use without removal of contaminating material which might be necessary if, for example, a bonding or welding technique were used to join the two segments.
When the invention is applied to the elimination of parasitic formations from a plastic object, this object can be prefaced with a recess close to a region of the object or a burr line or a similar parasitic formation tends to forming, so that the laser energy beam can be used to cause the parasitic formation to flow into and be received by the recess. Alternatively, the laser energy beam can be used to remove the burr line by a cutting operation.
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB919123154A GB9123154D0 (en) | 1991-10-31 | 1991-10-31 | Manufacture of plastics articles |
Publications (1)
Publication Number | Publication Date |
---|---|
BE1006261A5 true BE1006261A5 (en) | 1994-07-05 |
Family
ID=10703873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE9200943A BE1006261A5 (en) | 1991-10-31 | 1992-10-30 | Manufacture of articles plastic. |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPH05237845A (en) |
BE (1) | BE1006261A5 (en) |
DE (1) | DE4236558A1 (en) |
FR (1) | FR2684916A1 (en) |
GB (2) | GB9123154D0 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19710253A1 (en) * | 1997-03-13 | 1998-09-17 | Mann & Hummel Filter | Process for the production of plastic bodies |
DE102005034627A1 (en) * | 2005-07-19 | 2007-02-01 | Takata-Petri Ag | Apparatus and method for removing an elongated ridge on a molding |
DE102007026265B4 (en) * | 2007-06-05 | 2014-04-10 | Gerhard Präzisionspresstechnik GmbH | carbon brush |
DE102009060795A1 (en) | 2009-12-31 | 2011-07-07 | Liebherr-Werk Nenzing GmbH, Vorarlberg | Pipe element with a cutting edge for welding to a support element |
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NL91905C (en) * | 1900-01-01 | |||
US2546208A (en) * | 1949-04-30 | 1951-03-27 | Injection Molding Company | Method of sealing hollow bodies |
US3769117A (en) * | 1971-12-30 | 1973-10-30 | American Can Co | Laser welding plastic tubes |
JPS5314772A (en) * | 1976-07-27 | 1978-02-09 | Nippon Electric Co | Laser welding apparatus |
GB2067128A (en) * | 1980-01-04 | 1981-07-22 | Banarse P S | Improvements in or relating to the manufacture of plastics bodies |
EP0084631A1 (en) * | 1982-01-04 | 1983-08-03 | International Business Machines Corporation | Laser joining of thermoplastic and non-thermoplastic materials |
JPS604225A (en) * | 1983-06-23 | 1985-01-10 | Toshiba Corp | Method for removing resin burr in resin mold semiconductor device |
JPS60103628A (en) * | 1983-11-10 | 1985-06-07 | Nec Corp | Manufacture of resin molded semiconductor device |
JPS60212330A (en) * | 1984-04-06 | 1985-10-24 | Toyota Motor Corp | Joining of heterogeneous synthetic resin materials |
FR2580985A1 (en) * | 1985-04-25 | 1986-10-31 | Peugeot | Method for assembling components made from cellular material, for example expanded polystyrene |
DE3530039A1 (en) * | 1985-08-22 | 1987-02-26 | Agfa Gevaert Ag | Process for producing elongate hollow bodies for phototechnical apparatus |
EP0288884A1 (en) * | 1987-04-22 | 1988-11-02 | Bernd Büdenbender | Weld |
US4806729A (en) * | 1988-01-04 | 1989-02-21 | Oregon Graduate Center | Laser wax joinery method and apparatus |
GB2210309A (en) * | 1987-09-30 | 1989-06-07 | Toyo Seikan Kaisha Ltd | Butt welding method by means of laser beam |
-
1991
- 1991-10-31 GB GB919123154A patent/GB9123154D0/en active Pending
-
1992
- 1992-10-22 GB GB9222177A patent/GB2260933B/en not_active Expired - Fee Related
- 1992-10-28 FR FR9212855A patent/FR2684916A1/en active Granted
- 1992-10-29 DE DE4236558A patent/DE4236558A1/de not_active Withdrawn
- 1992-10-30 BE BE9200943A patent/BE1006261A5/en not_active IP Right Cessation
- 1992-11-02 JP JP4294473A patent/JPH05237845A/en active Pending
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NL91905C (en) * | 1900-01-01 | |||
US2546208A (en) * | 1949-04-30 | 1951-03-27 | Injection Molding Company | Method of sealing hollow bodies |
US3769117A (en) * | 1971-12-30 | 1973-10-30 | American Can Co | Laser welding plastic tubes |
JPS5314772A (en) * | 1976-07-27 | 1978-02-09 | Nippon Electric Co | Laser welding apparatus |
GB2067128A (en) * | 1980-01-04 | 1981-07-22 | Banarse P S | Improvements in or relating to the manufacture of plastics bodies |
EP0084631A1 (en) * | 1982-01-04 | 1983-08-03 | International Business Machines Corporation | Laser joining of thermoplastic and non-thermoplastic materials |
JPS604225A (en) * | 1983-06-23 | 1985-01-10 | Toshiba Corp | Method for removing resin burr in resin mold semiconductor device |
JPS60103628A (en) * | 1983-11-10 | 1985-06-07 | Nec Corp | Manufacture of resin molded semiconductor device |
JPS60212330A (en) * | 1984-04-06 | 1985-10-24 | Toyota Motor Corp | Joining of heterogeneous synthetic resin materials |
FR2580985A1 (en) * | 1985-04-25 | 1986-10-31 | Peugeot | Method for assembling components made from cellular material, for example expanded polystyrene |
DE3530039A1 (en) * | 1985-08-22 | 1987-02-26 | Agfa Gevaert Ag | Process for producing elongate hollow bodies for phototechnical apparatus |
EP0288884A1 (en) * | 1987-04-22 | 1988-11-02 | Bernd Büdenbender | Weld |
GB2210309A (en) * | 1987-09-30 | 1989-06-07 | Toyo Seikan Kaisha Ltd | Butt welding method by means of laser beam |
US4806729A (en) * | 1988-01-04 | 1989-02-21 | Oregon Graduate Center | Laser wax joinery method and apparatus |
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Title |
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DATABASE WPI Week 85, Derwent World Patents Index; AN 85-046723(08) * |
PATENT ABSTRACTS OF JAPAN vol. 10, no. 66 (M - 461)<2123> 15 March 1986 (1986-03-15) * |
PATENT ABSTRACTS OF JAPAN vol. 9, no. 255 (E - 349) 12 October 1985 (1985-10-12) * |
Also Published As
Publication number | Publication date |
---|---|
FR2684916B1 (en) | 1994-12-09 |
GB2260933A (en) | 1993-05-05 |
GB2260933B (en) | 1996-07-03 |
DE4236558A1 (en) | 1993-05-06 |
GB9123154D0 (en) | 1991-12-18 |
FR2684916A1 (en) | 1993-06-18 |
GB9222177D0 (en) | 1992-12-02 |
JPH05237845A (en) | 1993-09-17 |
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RE | Patent lapsed |
Owner name: *SIEMENS AUTOMATIVE SYSTEMS LTD Effective date: 20021031 |