ES2320504B1 - NEGATIVE DISMOLDING SYSTEM. - Google Patents
NEGATIVE DISMOLDING SYSTEM. Download PDFInfo
- Publication number
- ES2320504B1 ES2320504B1 ES200502882A ES200502882A ES2320504B1 ES 2320504 B1 ES2320504 B1 ES 2320504B1 ES 200502882 A ES200502882 A ES 200502882A ES 200502882 A ES200502882 A ES 200502882A ES 2320504 B1 ES2320504 B1 ES 2320504B1
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- ES
- Spain
- Prior art keywords
- skate
- negative
- mold
- head
- folding
- 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.)
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Links
- 238000010137 moulding (plastic) Methods 0.000 claims abstract 2
- 238000000465 moulding Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 210000000078 claw Anatomy 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
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
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4435—Removing or ejecting moulded articles for undercut articles using inclined, tiltable or flexible undercut forming elements driven by the ejector means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Sistema de desmoldeo de negativos, especialmente en el moldeo en plástico; del tipo de los que comprenden un casquillo (2) preferentemente cilíndrico que se fija por medio de tornillos a la parte desplazable del molde, y de un contramolde (3) que se desplaza por el interior del casquillo (2) y que consta de un patín (7) que se fija a la placa de expulsión del molde, articulado a un cabezal abatible (6) articulados entre sí, donde la articulación entre el patín (7) y el cabezal abatible (6) consiste en un pasador (8); presentando tanto el patín (7) como el cabezal abatible (6) sendos taladros ciegos (15, 16) enfrentados en los que se acopla un muelle (17) que relaciona también ambas piezas.Negative demoulding system, especially in plastic molding; of the kind that comprise a bushing (2) preferably cylindrical which is fixed by means of screws to the movable part of the mold, and a countermold (3) that travels inside the bushing (2) and that consists of a skate (7) that is fixed to the mold ejection plate, articulated to a folding head (6) articulated with each other, where the articulation between the skate (7) and the folding head (6) consists in a pin (8); presenting both the skate (7) and the head folding (6) two blind drills (15, 16) facing in which a spring (17) is connected which also relates both pieces.
Description
Sistema de desmoldeo de negativos.Negative demoulding system.
La presente invención se refiere a un sistema de desmoldeo de negativos, especialmente en el moldeo en plástico.The present invention relates to a system of negative demoulding, especially in molding in plastic.
Según se ve en las figuras 8 y 9, un molde para moldeo de piezas plásticas comprende una parte fija y otra parte móvil o desplazable, donde respectivamente se montan una placa portafiguras de la parte fija (40) y otra placa portafiguras de la parte desplazable (41) que son finalmente las que dan forma a la pieza (42) a moldear, al cerrarse la parte desplazable del molde contra la parte fija y generarse entre las placas portafiguras la cámara de moldeo.As seen in Figures 8 and 9, a mold for molding of plastic parts comprises a fixed part and another part mobile or scrollable, where respectively a plate is mounted figure holder of the fixed part (40) and another plate holder of the movable part (41) which are finally the ones that shape the piece (42) to be molded, when the movable part of the mold is closed against the fixed part and be generated between the plate holders the molding chamber
Posteriormente la parte desplazable del molde se separa de la parte fija, separándose las placas portafiguras y quedando la pieza (42) terminada pegada a una de ellas, normalmente a la correspondiente a la parte desplazable del molde, por lo que se necesita despegarla mediante unos expulsores.Subsequently the movable part of the mold is separates from the fixed part, separating the plate holders and leaving the finished piece (42) attached to one of them, normally to that corresponding to the movable part of the mold, so it is necessary to detach it by means of ejectors.
Estos expulsores no son otra cosa que unos vástagos que empujan a la pieza moldeada fuera de la placa portafiguras. Dichos vástagos dimanan de una placa de expulsión (51) incorporada de modo flotante a la parte desplazable del molde. Al moverse la placa expulsora se mueven los vástagos y se produce el desmoldeo de la pieza.These ejectors are nothing other than stems that push the molded part out of the plate Portafiguras. Such stems emanate from an ejection plate (51) floatingly incorporated into the movable part of the mold. When the ejector plate moves, the stems move and produce the demoulding of the piece.
En el moldeo de plásticos se conocen como negativos aquellas zonas del molde que no tienen la misma dirección de desmoldeo que el resto. Por ejemplo, una pieza (42) que conste de una porción plana con una patilla saliente y dotada de una garra (45) extrema genera un negativo precisamente en la garra (45) extrema, ya que no se podrá desmoldear en la dirección de extracción directa de la porción plana, al quedar enclavada la garra (45).In the molding of plastics they are known as negative those areas of the mold that do not have the same direction of demoulding than the rest. For example, a piece (42) that consists of a flat portion with a protruding pin and equipped with a claw (45) Extreme generates a negative precisely in the claw (45) extreme, since it cannot be unmold in the direction of direct extraction of the flat portion, when the claw (45).
Para el desmoldeo en estos casos lo que se hace son unos contramoldes (46) móviles que avanzan con la placa de expulsión (51) y a la vez se abren lateralmente. Esta apertura o desplazamiento lateral libera el negativo y permite la extracción de la pieza (42) como se ve en las figuras 8 y 9.For the demoulding in these cases what is done they are mobile countermoulds (46) that advance with the plate expulsion (51) and at the same time open laterally. This opening or lateral displacement releases the negative and allows extraction of the piece (42) as seen in figures 8 and 9.
Una primera variante de contramolde se muestra en la figura 8. El contramolde (46) comprende una barra de sección rectangular o circular rebajada lateralmente (47) para permitir su flexión lateral y liberar el negativo del molde.A first variant of counter mold is shown in figure 8. The countermold (46) comprises a section bar rectangular or circular laterally lowered (47) to allow its lateral flexion and release the negative from the mold.
Otra variante de contramolde se muestra en la figura 9. El contramolde (46) comprende un patín (48) y un cabezal abatible (49) cilíndricos articulados entre sí. La articulación (50) permite al cabezal abatible (49) desplazarse lateralmente y liberar el negativo.Another variant of counter mold is shown in the Figure 9. The countermold (46) comprises a skate (48) and a head folding (49) cylindrical articulated with each other. Articulation (50) allows the folding head (49) to move laterally and Release the negative.
En la primera variante el inconveniente principal consiste en que en caso necesario de recambio por rotura o desgaste se debe cambiar la pieza entera. Además el tiempo necesario para mecanizar el alojamiento de la pieza es considerable e implica costes importantes.In the first variant the drawback main is that if necessary, replacement due to breakage or wear the entire piece must be changed. Besides time necessary to mechanize the housing of the piece is considerable and implies significant costs.
En la segunda variante no existe este inconveniente, sin embargo el ajuste de las dos piezas que conforman el contramolde es cilíndrico con reducida conicidad por lo que: 1-la presión de inyección del plástico puede modificar la posición de la cabeza abatible y producir alteración en la geometría de las piezas, rebabas, etc; 2-Cómo tiene mayor superficie cilíndrica necesita más recorrido para abatir la primera pieza.In the second variant this does not exist inconvenient, however the adjustment of the two pieces that make up the counter mold is cylindrical with reduced taper by What: 1-plastic injection pressure can change the position of the folding head and produce alteration in the geometry of the pieces, burrs, etc; 2-How it has more cylindrical surface needs more travel to bring down the first piece.
Para evitar estos problemas que presentan estos sistemas conocidos se ha ideado el sistema de la invención.To avoid these problems that present these known systems the system of the invention has been devised.
El sistema de la invención comprende un casquillo guía en el que se acopla interiormente un contramolde móvil.The system of the invention comprises a guide bushing in which a countermold is fitted internally mobile.
Ambas piezas son de acero.Both pieces are made of steel.
El casquillo guía es cilíndrico y presenta un ensanchamiento extremo prismático dotado de dos taladros pasantes para su fijación mediante tornillos a la parte desplazable del molde.The guide bushing is cylindrical and has a widening prismatic end equipped with two through holes for fixing with screws to the movable part of the mold.
El contramolde móvil comprende dos piezas de acero que quedan por el interior del casquillo guía. Estas dos piezas van articuladas por medio de un pasador.The mobile counter mold comprises two pieces of steel left inside the guide bushing. These two pieces are articulated by means of a pin.
Además, las dos piezas citadas del contramolde se encuentran relacionadas lateralmente por medio de un muelle que se aloja en sendos orificios ciegos practicados en estas dos piezas.In addition, the two quoted parts of the counter mold they are related laterally by means of a spring that it is housed in two blind holes practiced in these two pieces.
Una de las piezas del contramolde es un patín cilíndrico con una parte extrema prismática que remata en dos orejetas perforadas iguales, paralelas y enfrentadas que determinan un espacio en el que se acopla una orejeta perforada extrema de la otra pieza, que se trata de un cabezal abatible, relacionándose las orejetas por medio del pasador.One of the pieces of the counter mold is a skate cylindrical with a prismatic end part that ends in two equal, parallel and facing perforated lugs that determine a space in which an extreme perforated lug of the another piece, which is a folding head, relating the lugs by means of the pin.
El cabezal abatible es prismático y muestra una de sus caras laterales mayores inclinada.The folding head is prismatic and shows a of its inclined major lateral faces.
El patín dispone de un taladro ciego roscado en el que se acopla el tornillo de fijación a la placa de expulsión del molde.The skate has a blind hole threaded into which attaches the fixing screw to the ejection plate of the mold.
El muelle que relaciona las dos piezas del contramolde fuerza el desplazamiento lateral flexible del cabezal abatible prismático al avanzar dicho contramolde por el casquillo guía, permitiendo el desmoldeo del negativo. Al retroceder, la cara lateral inclinada fuerza la torsión del muelle y el cierre del negativo del molde, que se configura en la cara lateral opuesta.The dock that relates the two pieces of the counter mold forces the flexible lateral displacement of the head folding prismatic when advancing said counter mold by the bushing guide, allowing the demoulding of the negative. When backing, the face inclined side forces the torsion of the spring and the closure of the negative of the mold, which is configured on the side face opposite.
La figura 1 muestra una vista lateral del patín del sistema de la invención.Figure 1 shows a side view of the skate of the system of the invention.
La figura 2 muestra una vista lateral del sistema en una secuencia donde aparecen sus dos posiciones extremas y varias intermedias.Figure 2 shows a side view of the system in a sequence where its two extreme positions appear and several intermediates.
La figura 3 muestra una vista en perspectiva de la pieza extrema superior del patín.Figure 3 shows a perspective view of the upper end piece of the skate.
La figura 4 muestra vista lateral de la figura 3.Figure 4 shows side view of the figure 3.
La figura 5 muestra una vista en perspectiva de la otra pieza del patín.Figure 5 shows a perspective view of The other piece of the skate.
La figura 6 muestra una vista lateral de la figura 5.Figure 6 shows a side view of the figure 5.
La figura 7 muestra una vista seccionada de la figura 5.Figure 7 shows a sectional view of the figure 5.
La figura 8 muestra una primera variante de un contramolde móvil perteneciente al estado de la técnica, y formado por una barra de sección rectangular o circular rebajada lateralmente.Figure 8 shows a first variant of a mobile countermold belonging to the state of the art, and formed by a bar of rectangular or circular section recessed sideways.
La figura 9 muestra una segunda variante de un contramolde móvil perteneciente al estado de la técnica, y formado por un patín y una cabeza abatible cilíndricos articulados entre sí.Figure 9 shows a second variant of a mobile countermold belonging to the state of the art, and formed by a cylindrical skid and a hinged head articulated between yes.
El sistema de desmoldeo de negativos comprende un dispositivo (1) constituido por un casquillo guía (2) y un contramolde móvil (3).The negative demoulding system comprises a device (1) consisting of a guide bushing (2) and a mobile countermold (3).
El casquillo guía (2) presenta un ensanchamiento extremo (4) dotado de taladros pasantes (5) para acoplar tornillos de fijación a la parte desplazable del molde, no representada.The guide bushing (2) has a widening end (4) equipped with through holes (5) for coupling screws fixing to the movable part of the mold, not shown.
Por el interior del casquillo guía (2) se posiciona el contramolde móvil (3), constituido de dos piezas relacionadas por un pasador (8).Inside the guide bushing (2) position the mobile countermold (3), consisting of two pieces related by a pin (8).
Una de las piezas es un patín (7) que tiene una zona cilíndrica (9) y otra forma prismática (10) que remata por su extremo en dos orejetas (11) paralelas perforadas (12) enfrentadas. La zona cilíndrica (9) dispone de un taladro ciego roscado (20) en el que se acopla el tornillo de fijación, no representado, a la placa de expulsión del molde, no representada en las figuras 1-7.One of the pieces is a skate (7) that has a cylindrical zone (9) and another prismatic shape (10) that ends at its end in two perforated parallel lugs (11) facing each other (12). The cylindrical zone (9) has a threaded blind hole (20) in which attaches the fixing screw, not shown, to the mold ejection plate, not shown in the figures 1-7.
La otra pieza es un cabezal abatible (6) de forma prismática dotado de una orejeta perforada (13) que se acopla en el espacio (14) definido entre las dos orejetas (11) por medio del pasador (8).The other piece is a folding head (6) of prismatic shape with a perforated lug (13) that fits in the space (14) defined between the two lugs (11) by middle of the pin (8).
El cabezal abatible (6) dispone de una cara lateral inclinada (14a) y en dicha zona la pieza presenta un orificio (15) ciego similar a otro orificio (16) ciego que tiene el patín (7).The folding head (6) has a face inclined side (14a) and in said area the piece has a blind hole (15) similar to another blind hole (16) that has the skate (7).
En estos orificios ciegos (15, 16) se dispone un muelle (17) que fuerza el giro o desplazamiento lateral flexible del cabezal abatible (6) al avanzar el contramolde móvil (3), lo que permite el desmoldeo del negativo, no representado en las figuras 1-7, y que iría en la cara lateral del cabezal abatible (6) opuesta a su cara lateral inclinada (14a). Al retroceder el contramolde el contacto de la cara lateral inclinada (14a) con el interior del casquillo guía (2) recoloca el cabezal forzando la torsión del muelle (17).In these blind holes (15, 16) a spring (17) that forces the rotation or flexible lateral displacement of the collapsible head (6) when advancing the mobile countermold (3), which allows the demoulding of the negative, not represented in the Figures 1-7, and that would go on the side face of the folding head (6) opposite its inclined side face (14a). To the reverse the counter mold the inclined side face contact (14a) with the inside of the guide bushing (2) replace the head forcing the torsion of the spring (17).
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200502882A ES2320504B1 (en) | 2005-11-23 | 2005-11-23 | NEGATIVE DISMOLDING SYSTEM. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200502882A ES2320504B1 (en) | 2005-11-23 | 2005-11-23 | NEGATIVE DISMOLDING SYSTEM. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2320504A1 ES2320504A1 (en) | 2009-05-22 |
| ES2320504B1 true ES2320504B1 (en) | 2010-03-01 |
Family
ID=40719131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES200502882A Active ES2320504B1 (en) | 2005-11-23 | 2005-11-23 | NEGATIVE DISMOLDING SYSTEM. |
Country Status (1)
| Country | Link |
|---|---|
| ES (1) | ES2320504B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2345697B1 (en) | 2007-12-31 | 2011-09-28 | Jose Luis Gonzalez Palacio Fenech | DEVICE FOR THE DISMOLDING OF NEGATIVES IN PLASTIC INJECTION. |
| ES2587059T3 (en) * | 2009-11-30 | 2016-10-20 | Progressive Components International Corporation | Molding device for injection molding parts with notches |
| CN105172070B (en) * | 2015-08-19 | 2017-07-14 | 东江模具（深圳）有限公司 | A kind of ejecting structure of plastic mould |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5551864A (en) * | 1995-01-12 | 1996-09-03 | Boskovic; Borislav | Core lifter system |
| JPH09155937A (en) * | 1995-12-04 | 1997-06-17 | Ikegami Seiko Kk | Undercut treating pin for resin mold |
| FR2768360B1 (en) * | 1997-09-16 | 1999-10-29 | Allibert Ind | PROCESS FOR MOLDING A WORKPIECE WITH UNDERPROOF, MOLD USED AND WORKPIECE OBTAINED |
| US6059558A (en) * | 1998-07-27 | 2000-05-09 | Velcro Industries | Injection molding fastener products |
| EP1559531A1 (en) * | 2004-01-30 | 2005-08-03 | Kramer AG | Insert for injection mould and injection mould with this insert |
-
2005
- 2005-11-23 ES ES200502882A patent/ES2320504B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| ES2320504A1 (en) | 2009-05-22 |
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