ES2341636A1 - Ejector intended for submarine runners located on the fixed parts of thermoplastic injection moulds - Google Patents
Ejector intended for submarine runners located on the fixed parts of thermoplastic injection moulds Download PDFInfo
- Publication number
- ES2341636A1 ES2341636A1 ES200803641A ES200803641A ES2341636A1 ES 2341636 A1 ES2341636 A1 ES 2341636A1 ES 200803641 A ES200803641 A ES 200803641A ES 200803641 A ES200803641 A ES 200803641A ES 2341636 A1 ES2341636 A1 ES 2341636A1
- Authority
- ES
- Spain
- Prior art keywords
- fixed parts
- thermoplastic injection
- submarine
- ejector
- injection moulds
- 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.)
- Granted
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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
- B29C45/401—Ejector pin constructions or mountings
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Expulsor para colada submarina en partes fijas de moldes de inyección termoplásticos.Expeller for underwater casting in fixed parts of thermoplastic injection molds.
Los sectores de la técnica a los que se refiere la presente invención son el metal y el químico, y dentro de los mismos, y de forma conjunta, su aplicación principal se circunscribe a la inyección de moldes con coladas submarinas de piezas de material termoplástico.The technical sectors to which it refers The present invention is metal and chemical, and within themselves, and together, their main application is limited to the injection of molds with underwater casting of pieces of thermoplastic material
El objeto principal de la presente invención es simplificar, facilitar y asegurar la extracción de coladas submarinas localizadas en la parte fija de los moldes de inyección para termoplásticos.The main object of the present invention is simplify, facilitate and ensure the extraction of laundry submarines located in the fixed part of the injection molds for thermoplastics.
Los procesos de inyección de plástico consisten en calentar los pellets de un material termoplástico para transformarlos en un tipo masa a través de un cilindro de plastificación, dándole la forma final al molde. Cuando el plástico está en el molde, se enfría por medio de circuitos donde fluye agua y finalmente, se abre el molde para obtener una pieza sólida.Plastic injection processes consist of in heating the pellets of a thermoplastic material to transform them into a mass type through a cylinder of plasticizing, giving the final shape to the mold. When the plastic It is in the mold, it is cooled by circuits where water flows and finally, the mold is opened to obtain a solid piece.
Las máquinas de inyección tienen sistemas hidráulicos, los cuales controlan el movimiento de los sistemas de inyección y cierre; y sistemas eléctricos, que controlan temperaturas, flujo de agua, aceite, etc.Injection machines have systems hydraulics, which control the movement of the systems of injection and closure; and electrical systems, which control temperatures, water flow, oil, etc.
La colada fría es un componente de la pieza inyectada y necesita ciclos de inyección más largos. Este sistema es aplicado para piezas pequeñas. Los canales fríos llevan el plástico a las cavidades del molde y no cuentan con sistemas de control de temperatura como los sistemas de colada y canal calientes.Cold laundry is a component of the piece injected and needs longer injection cycles. This system is Applied for small parts. Cold channels carry plastic to the mold cavities and do not have control systems temperature like hot run and channel systems.
Las principales características de los moldes de inyección de plástico de colada y canal fríos son: tiempos de ciclo altos, mecanismo de desmoldeo complicado, gran cantidad de desperdicio de material, difícil repetitividad del producto, distancias (carreras) de apertura del molde muy grandes y proyección/distribución de las cavidades compleja.The main characteristics of the molds of Cold plastic casting and channel injection are: cycle times high, complicated mold release mechanism, large amount of waste of material, difficult product repeatability, opening distances (runs) of the mold very large and projection / distribution of complex cavities.
Además, en aquellas piezas en las que es necesaria una manipulación para separarlas de la colada, hay que afrontar el consiguiente encarecimiento de coste en tiempo y dinero.In addition, in those pieces in which it is manipulation is necessary to separate them from the laundry, you have to face the consequent cost increase in time and money.
El camino del material hasta la cavidad debe ser lo más corto posible para, entre otras cosas, minimizar las pérdidas de presión y calor. Las piezas inyectadas se contraen sobre los machos del molde, para su desmoldeo se aplican diferentes tipos de expulsores: de varilla, tubular, de placa extractora, plano, combinado, neumático, con leva, etc.The path of the material to the cavity must be as short as possible to, among other things, minimize losses of pressure and heat. Injected parts contract on the Mold males, different types of Ejectors: rod, tubular, extractor plate, flat, combined, pneumatic, with cam, etc.
El tipo de extractor o expulsor está en función de la forma de la pieza a inyectar. La presión superficial sobre la pieza a expulsar debe ser la mínima posible para evitar deformaciones.The type of extractor or ejector is in function of the shape of the piece to be injected. The surface pressure on the piece to be ejected should be the minimum possible to avoid deformations
Los expulsores sirven no sólo para el desmoldeo, sino también para la evacuación de los gases de la cavidad. Una salida defectuosa de la cavidad puede tener como consecuencias un llenado parcial de la cavidad, unión defectuosa de frentes de material o el denominado efecto Diesel (daños térmicos de la pieza).The ejectors serve not only for demolding, but also for the evacuation of gases from the cavity. A Defective outlet of the cavity can have as a consequence a partial filling of the cavity, defective union of fronts of material or the so-called Diesel effect (thermal damage of the piece).
El expulsor objeto de esta invención presenta unas ventajas de aplicación que se derivan de la posibilidad de realizar los procesos de inyección normalizados y automatizados sobre aquellas piezas en las que es obligada una manipulación para separarlas de la colada. Además y de forma comparativa con los actuales sistemas de expulsión disponibles comercialmente, se disminuye el alto riesgo de daño sobre el molde, evitando el desgaste funcional por rozamiento.The ejector object of this invention presents some advantages of application that derive from the possibility of perform standardized and automated injection processes on those pieces in which a manipulation is required to separate them from the laundry. In addition and comparatively with the current commercially available ejection systems, it decreases the high risk of damage to the mold, avoiding functional wear by friction.
El expulsor comprende una varilla metálica que presenta como característica principal su extremo superior, cabezal, que muestra una configuración fungiforme, estableciendo sus dimensiones en función del tamaño de la colada y de la pieza termoplástica a extraer.The ejector comprises a metal rod that Its main feature is its upper end, head, which shows a fungiform configuration, setting its dimensions depending on the size of the laundry and the piece thermoplastic to extract.
El expulsor simplifica, facilita (mediante su anclaje en la parte fija, entre las placas expulsadoras, de un molde de inyección para termoplásticos) y asegura la extracción de coladas submarinas localizadas en la parte fija (hembra) de los moldes de inyección para termoplásticos, sujetándolas en el momento de apertura del molde y evitando por tanto el agarre no deseado de las mismas, lo que obligaría a interrumpir el proceso de inyección y proceder a la extracción manual de la colada.The ejector simplifies, facilitates (by anchor in the fixed part, between the ejector plates, of a mold injection for thermoplastics) and ensures the extraction of laundry submarines located in the fixed part (female) of the molds of injection for thermoplastics, holding them at the time of opening of the mold and thus avoiding unwanted grip of the themselves, which would force to interrupt the injection process and proceed to manual extraction of the laundry.
El expulsor se concibe preferiblemente de acero F521 templado al núcleo 54 HRC y nitrurado al exterior \geq 950 HV 0.3, a fin de evitar el desgaste funcional por rozamiento.The ejector is preferably conceived of steel F521 tempered to core 54 HRC and nitrated to the outside ≥ 950 HV 0.3, in order to avoid functional wear by friction.
Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características de la invención, de acuerdo con un ejemplo preferente de realización práctica de la misma, se acompaña como parte integrante de dicha descripción, un juego de dibujos en donde con carácter ilustrativo y no limitativo, se ha representado lo siguiente:To complement the description that is being performing and in order to help a better understanding of the characteristics of the invention, according to an example preferred practical implementation of it, is accompanied as integral part of that description, a set of drawings where with an illustrative and non-limiting nature, what has been represented next:
Figura 1.- Muestra una vista en alzado de un expulsor fungiforme para moldes de inyección realizado de acuerdo con el objeto de la presente invención.Figure 1.- Shows an elevation view of a fungiform ejector for injection molds made according for the purpose of the present invention.
A continuación se describe un modo de realización preferente del expulsor objeto de la invención, que tal y como se observa en la figura comprende fundamentalmente: una varilla (1) metálica de acero templado y nitrurado, de dimensión y forma geométrica variables, en función del tamaño de la colada y de la pieza termoplástico a extraer, un cuerpo inferior (2) y un cabezal (3) fungiforme que representa la característica principal de la invención y que evita el desgaste funcional por rozamiento, disminuyendo el alto riesgo de daño sobre el molde.A mode of preferred embodiment of the ejector object of the invention, which such and as seen in the figure, it basically includes: a Tempered and nitrated steel metal rod (1), of dimension and Variable geometric shape, depending on the size of the laundry and the thermoplastic part to be extracted, a lower body (2) and a fungiform head (3) representing the main characteristic of the invention and that prevents functional wear by friction, decreasing the high risk of damage to the mold.
De acuerdo con una primera realización preferente de la invención, ilustrada en la figura 1, la varilla (1) es cilíndrica.According to a first embodiment preferred of the invention, illustrated in figure 1, the rod (1) It is cylindrical.
De acuerdo con una segunda realización preferente de la invención, no representada, la varilla (1) es de sección rectangular con sus caras paralelas dos a dos, lo cual permite que el mecanizado y posterior rectificado de todas sus caras resulte mucho más económico y sea posible realizarlo con maquinaria convencional.According to a second embodiment Preferred of the invention, not shown, the rod (1) is of rectangular section with its two to two parallel faces, which allows the machining and subsequent grinding of all its faces It is much cheaper and possible to do it with machinery conventional.
Claims (3)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200803641A ES2341636B1 (en) | 2008-12-22 | 2008-12-22 | EXPULSOR FOR UNDERWATER COLADA IN FIXED PARTS OF MOLDING INJECTION THERMOPLASTICS. |
| PCT/ES2009/000345 WO2010072855A1 (en) | 2008-12-22 | 2009-06-29 | Ejector intended for submarine runners located on the fixed parts of thermoplastic injection moulds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200803641A ES2341636B1 (en) | 2008-12-22 | 2008-12-22 | EXPULSOR FOR UNDERWATER COLADA IN FIXED PARTS OF MOLDING INJECTION THERMOPLASTICS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2341636A1 true ES2341636A1 (en) | 2010-06-23 |
| ES2341636B1 ES2341636B1 (en) | 2011-08-12 |
Family
ID=42236255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES200803641A Active ES2341636B1 (en) | 2008-12-22 | 2008-12-22 | EXPULSOR FOR UNDERWATER COLADA IN FIXED PARTS OF MOLDING INJECTION THERMOPLASTICS. |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES2341636B1 (en) |
| WO (1) | WO2010072855A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2348885A1 (en) * | 2010-09-29 | 2010-12-16 | Comercial De Utiles Y Moldes S.A. | Plastic injection mould with inner air extraction and extraction method for extracting the air carried out with said mould |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0872068A (en) * | 1994-09-01 | 1996-03-19 | Sekisui Chem Co Ltd | Pin for mold |
| US5639488A (en) * | 1994-11-25 | 1997-06-17 | Sumitomo Wiring Systems, Ltd. | Molding apparatus |
| JPH10180809A (en) * | 1996-12-24 | 1998-07-07 | Asahi Chem Ind Co Ltd | Die for gas jointly using injection molding |
| ES2170702A1 (en) * | 2000-10-25 | 2002-08-01 | Pruna Alberto Navarra | Flexible ejector for injection molds |
-
2008
- 2008-12-22 ES ES200803641A patent/ES2341636B1/en active Active
-
2009
- 2009-06-29 WO PCT/ES2009/000345 patent/WO2010072855A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0872068A (en) * | 1994-09-01 | 1996-03-19 | Sekisui Chem Co Ltd | Pin for mold |
| US5639488A (en) * | 1994-11-25 | 1997-06-17 | Sumitomo Wiring Systems, Ltd. | Molding apparatus |
| JPH10180809A (en) * | 1996-12-24 | 1998-07-07 | Asahi Chem Ind Co Ltd | Die for gas jointly using injection molding |
| ES2170702A1 (en) * | 2000-10-25 | 2002-08-01 | Pruna Alberto Navarra | Flexible ejector for injection molds |
Non-Patent Citations (2)
| Title |
|---|
| Resumen de la base de datos WPI. Recuperado de EPOQUE; Número de acceso 1996-204272 & JP 08072068 A (SEKISUI CHEMICAL CO LTD) 19.03.1996, figuras * |
| Resumen de la base de datos WPI. Recuperado de EPOQUE; Número de acceso 1998-432395 & JP 10180809 A (ASAHI CHEMICAL IND) 07.07.1998, figuras * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2348885A1 (en) * | 2010-09-29 | 2010-12-16 | Comercial De Utiles Y Moldes S.A. | Plastic injection mould with inner air extraction and extraction method for extracting the air carried out with said mould |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010072855A1 (en) | 2010-07-01 |
| ES2341636B1 (en) | 2011-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES2824252T3 (en) | A method of injection molding of plastic parts by means of a mold injection molding machine | |
| US9505156B2 (en) | Mold stack having a floating cavity insert | |
| ES2341636B1 (en) | EXPULSOR FOR UNDERWATER COLADA IN FIXED PARTS OF MOLDING INJECTION THERMOPLASTICS. | |
| US9296141B2 (en) | Hot runner nozzle for injecting thermoplastic material into a moulding tool | |
| CN203765941U (en) | Die for internally pouring and pushing out product at fixed die | |
| CN107116762A (en) | Mould and its injection moulding process for injection-molded plate | |
| KR100966877B1 (en) | Hot Runner System and Injection Molding Method using the same | |
| KR101537011B1 (en) | Injection mold having a undercut molding structure using a undercut molded ring | |
| CN102892564A (en) | Injection molding die device for producing cabinet of thin display device and method for producing cabinet of thin display device | |
| KR101326606B1 (en) | Injection mold with a gas venting core | |
| CN111002535B (en) | Wear-resistant durable injection mold | |
| CN210758872U (en) | Plastic comb preparation mould | |
| CN104210073B (en) | A kind of without ejector retainner plate demolding structure mould | |
| CN208529614U (en) | A kind of pull ring production mould | |
| CN206718381U (en) | A kind of die assembly of the Anti-dismantling housing injection demoulding | |
| JP6199346B2 (en) | Molding method and injection molding machine characterized by extrusion of molded product | |
| RU2330756C1 (en) | Automatic machine for manufacture of consumable patterns by injection molding | |
| CN207432694U (en) | The sub-marine gate of precise plastic molding die | |
| CN202640669U (en) | Hot flow passage mold adopting guide tube forming | |
| CN109454837B (en) | Automatic demoulding device of injection mould of display panel | |
| CN214490977U (en) | Ceramic vortex tube forming die | |
| CN213162945U (en) | Valve pocket spiral advances to water mould | |
| JPWO2012176312A1 (en) | Injection mold apparatus and injection molding machine | |
| CN207789622U (en) | A kind of die structure of hot runner | |
| CN204076689U (en) | Core-pulling mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EC2A | Search report published |
Date of ref document: 20100623 Kind code of ref document: A1 |
|
| FG2A | Definitive protection |
Ref document number: 2341636 Country of ref document: ES Kind code of ref document: B1 Effective date: 20110812 |