JP2006297663A - Mold assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a component from being destroyed by the clamping force of a mold. <P>SOLUTION: This mold assembly comprises a fixed mold 11 and a movable mold 21 constituted so as to be freely clamped on and separated from the fixed mold 11 while molding cavities 13 and 23 are provided to the opposed surfaces of the movable mold 21 and the fixed mold 11. A glass component 40 is held between the fixed mold 11 and the movable mold 21 and a molding material is injected in the molding cavities 13 and 23 in a state that a part of the glass component 40 is positioned in the cavity 13. Further, a support member 30 comprising an elastic material is provided to the opposed surface of the fixed mold 11 in a protruded state and the component 40 is elastically held between the fixed mold 11 and the movable mold 21 through the support member 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mold apparatus suitable for molding an object part that is easily broken, such as glass, as an insert or outsert part.

  As is well known, insert molding is a process in which a resin is injected in a state in which a part is inserted into a mold, and the part is wrapped in a molten resin and solidified to form an integrated composite part. Molding is a process in which resin is attached and fixed to a part of a part and integrated to make a composite part (see Patent Documents 1 and 2). These differ depending on whether the part is wrapped with a molded product or the molded product adheres to a part of the part, but there is no essential difference.

  Conventionally, these molding methods have been used to embed metal parts such as screws and nuts in molded products, and to fix various functional parts such as ribs and bosses on the metal parts. The present inventors paid attention to these molding techniques and have been diligently researching a technique for directly attaching a molded part to glass.

However, whether it is insert molding or outsert molding, the insert part or outsert part is clamped by using the clamping force of the mold during molding, and this part is easily broken like glass. When applied to, there was a risk of parts being destroyed.
Japanese Patent Application Laid-Open No. 06-320569 JP 09-039066 A

  Then, the main subject of this invention is providing the metal mold apparatus which does not have a possibility of destroying components with the clamping force of a formwork.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A fixed mold and a movable mold configured to be freely clamped and separated with respect to the fixed mold; and a molding region for injecting a molding material on at least one of the opposed surfaces of the movable mold and the fixed mold. A mold apparatus configured to inject a molding material in a state where a part is sandwiched between a fixed mold and a movable mold and at least a part of the part is positioned in the molding region. ,
A support member made of an elastic material is provided to protrude on at least one of the movable mold and the fixed mold, and the component is elastically sandwiched between the fixed mold and the movable mold via the support member. Configured as
A mold apparatus characterized by that.

<Invention of Claim 2>
The support member is provided so that it can freely protrude and retract with respect to at least one of the movable type and the fixed type, and the biasing force is applied to the support member in the protruding direction with a force smaller than the clamping force of the movable type. The mold apparatus according to claim 1, further comprising means.

<Invention of Claim 3>
The mold apparatus according to claim 1, wherein the support member is provided only in a fixed mold and not provided in a movable mold.

<Invention of Claim 4>
The metal mold according to any one of claims 1 to 3, wherein an engagement portion with which the component is engaged is provided at a portion excluding the molding region on at least one of the movable mold and the stationary mold. apparatus.

<Invention of Claim 5>
5. The structure according to claim 1, wherein a plurality of eject pins are arranged in parallel on the opposing surface of the movable mold along the peripheral edge of the component while being configured so that the peripheral edge of the component is positioned in the molding region. The mold apparatus of Claim 1.

<Invention of Claim 6>
The mold apparatus according to claim 1, wherein the part is a glass part.

  In the present invention, the target component is elastically sandwiched between the fixed mold and the movable mold via a support member made of an elastic material protruding from at least one of the movable mold and the fixed mold. Therefore, even if the clamping force of the mold is applied, the support member exhibits a buffering action, and the target part is difficult to break.

  The term “molding region” in the present invention means a region where resin is injected for molding, and means a portion where a cavity (concave portion) or a core is provided.

  In the present invention, when the support member is allowed to protrude and retract freely and is urged in the protruding direction with a force smaller than the movable clamping force, when the movable member is tightened and the support member is pressed against the component, the pressing force is It will not be greater than the biasing force of the support member. Therefore, by setting this urging force to such an extent that the component does not break, the component breakage can be reliably prevented. In addition, if the support member can be retracted while maintaining a predetermined support pressure in this manner, there is also an advantage that the component can be supported from an earlier stage in the moving type tightening process.

  In a normal molding machine, since a mechanism for ejecting pins is provided in the movable mold, it is preferable that the support member of the present invention is provided only in the fixed mold and not in the movable mold.

  On the other hand, the part needs to be positioned at a predetermined position in the mold. However, if there is no guideline, the operation becomes extremely difficult and there is a possibility that the molding accuracy is lowered. Therefore, in the present invention, it is preferable to provide an engaging portion with which a part is engaged on at least one facing surface of the dynamic type and the fixed type. In addition, since normal eject pins protrude in the process of inserting the components into the mold, it is also a preferred form that the eject pins are arranged so that the components can be positioned using this.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 4 show an example of a mold apparatus according to the present invention. This apparatus has a fixed side portion 10 having a fixed mold 11, and faces the fixed mold 11, and is clamped and separated from the fixed mold 11. And a movable side portion 20 having a movable mold 21 configured to be capable of moving.

  On the surface of the fixed mold 11 facing the movable mold 21, there are formed 12 component-accommodating cavities (concave portions) into which the entire component 40 such as a glass plate is fitted and accommodated, and a predetermined portion (upper part in the figure) of this component. A molding cavity (corresponding to a molding region) 13 is formed at a position facing the surface.

  A molding cavity (corresponding to a molding region) 23 is formed on a surface of the movable mold 21 facing the fixed mold 11 at a position facing a predetermined part (upper part in the drawing) of the part. A plurality of eject pins 24 are provided. The eject pin 24 is connected to an eject plate 25 of an eject mechanism portion provided on the back side of the movable die 21, and protrudes into the cavity 23 as the eject plate 25 is reciprocated by a drive device (not shown). 23 can be evacuated from the inside.

  Further, the sprue 14 passes through the fixed side portion 10 and is opened at a portion of the fixed mold 11 excluding the cavities 12 and 13, and communicates from the portion facing the sprue 14 in the movable mold 21 to the molding cavity 23. Grooves 22 for forming runners are formed in The runner groove 22 can be formed in the fixed mold 11 or can be formed in both the movable mold 21 and the fixed mold 11.

  Characteristically, a support member 30 made of an elastic material protrudes from a surface of the fixed mold 11 facing the movable mold 21. As the elastic material used for the support member 30, a viscoelastic material having high heat resistance such as fluorine rubber or silicon rubber is suitable. Since the support member 30 supports parts, it is preferable to support at three or more points as shown in FIG. 2 from the viewpoint of stability of support.

  The support member 30 can be fixedly supported, but is preferably elastically supported as illustrated. That is, as shown in an enlarged view in FIG. 4, the support member 30 is inserted into the concave hole 31 formed in the fixed mold 11, and an elastic material such as a spring is interposed between the support member 30 and the concave hole 31. The urging means 32 is interposed and urged in the protruding direction. Further, a stepped portion 30p is provided on the outer periphery of the base end portion of the support member 30, and a stepped portion 31p is also provided on the inner peripheral surface of the recessed hole. When the stepped portions 30p and 31p are in contact with each other, the support member 30 is provided. The amount of protrusion is regulated.

  Therefore, when the mold is clamped, the tip of the support member 30 first comes into contact with the surface of the component 40 when the movable die 21 is moved closer to the fixed die 11 after the component 40 is fitted and positioned in the component receiving cavity 12. . Since the support member 30 is made of an elastic material, the impact due to this contact is absorbed, and component destruction is prevented. When further tightening, the elastic urging force of the urging means 32 becomes weaker than the force required for elastic deformation of the support member 30, and the support member 30 is pushed into the concave hole 31 against the urging force, thereby clamping the mold. Complete. Thus, due to the elastic force of the support member 30 and the elastic biasing force of the biasing means 32, the component 40 is elastically sandwiched between the fixed mold 11 and the movable mold 21, and the component destruction in the mold clamping is effectively performed. Is prevented. Thereafter, this is basically the same as the normal molding, and the cavity is formed via the sprue 14 and the runner 22 with a part of the component 40 positioned in the molding cavity 13 between the fixed mold 11 and the movable mold. After the molding material is injected into 13 and held and cooled, the molds 11 and 21 are opened as shown in FIG. 5, the eject pins 24 are projected to discharge the molded article, and the molding cycle is completed.

  By the way, in the said embodiment, the components 40 fit in the accommodation cavity 12. FIG. Therefore, it is possible to position the component 40 only by accommodating the component 40 in the accommodating cavity 12. In addition to the fitting, if there is an engaging portion such as a convex portion or a step that can be positioned by engaging the peripheral portion of the component 40, the positioning becomes easy. However, since surface irregularities for positioning cannot be formed in the molding region, positioning by engaging the peripheral edge of the part and the mold surface unevenness is performed when the molded product is attached to the entire peripheral part of the part 40 or most of the peripheral part. May become impossible.

  Therefore, when the peripheral portion of the component 40 is located in the molding cavity, as shown in FIG. 6, a plurality of eject pins 24 are arranged in parallel along the peripheral portion of the component 40 in the movable mold 21 and positioned. It is also proposed to use it. The positioning eject pins 24 are preferably disposed so as to surround the component 40, and are preferably disposed in at least two, preferably three or four directions of the component 40. For positioning, the eject pin 24 is projected with the molds 11 and 21 open (the normal eject pin 24 projects in the process of inserting the component 40 into the molds 11 and 21). The peripheral part of the component 40 is brought into contact with and positioned. When the eject pins 24 are arranged on the four sides of the component 40 as shown in the figure, the component 40 is inserted into a portion surrounded by them. Thereafter, the mold is clamped and the component 40 is held by the support member 30 so as not to move, and then the eject pin 24 is pulled in so that the material can be injected into the molding cavity 13.

<Others>
(A) In the above example, the support member 30 is provided only on the fixed mold 11. However, instead of this or along with this, the support mold 30 may be provided on the movable mold 21.

(B) In the above example, the component receiving cavity 12 is provided only in the fixed mold 11, but the component receiving cavity may be provided in the movable mold 21 instead of or together with this.

(C) In the above example, the molding cavities 13 and 23 are provided in both the fixed mold 11 and the movable mold 21, but can be provided only in either one.

(D) In the above example, only the cavities 12, 13, and 23 are provided, but a core may be provided according to the shape of the molded product.

(E) The above example assumes a horizontal molding machine in which a movable mold and a fixed mold are juxtaposed side by side, but it can also be applied to a vertical molding machine.

(F) In the above example, the entire part 40 is accommodated in the mold (between the fixed mold 11 and the movable mold 21), but only a part of the part 40 is accommodated in the mold, and the remainder is the mold. It can also be configured to protrude outside.

(G) In the present invention, although not limited by the material of the component, it is suitable for a material that is easily broken such as glass.

  The present invention is suitable for making a composite part by attaching and fixing a resin to a part of a fragile part such as glass, but is not limited to this, and can be applied to a wide range of applications. .

It is a longitudinal cross-sectional view which shows the clamping state of the metal mold apparatus which concerns on this invention. It is an II-II arrow line view of FIG. It is the III-III arrow line view of FIG. It is an enlarged view of the support member part of FIG. It is a longitudinal cross-sectional view which shows a mold open state. It is a principal part perspective view which shows the other form of an eject pin.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Fixed side part, 11 ... Fixed type | mold, 12 ... Component accommodation cavity, 13 ... Molding cavity, 14 ... Sprue, 20 ... Moving side part, 21 ... Moving mold, 22 ... Runner groove, 23 ... Molding cavity, 24 ... eject pin, 25 ... eject plate, 30 ... support member, 31 ... concave hole, 32 ... biasing means.

Claims (6)

A fixed mold and a movable mold configured to be freely clamped and separated with respect to the fixed mold; and a molding region for injecting a molding material on at least one of the opposed surfaces of the movable mold and the fixed mold. A mold apparatus configured to inject a molding material in a state where a part is sandwiched between a fixed mold and a movable mold and at least a part of the part is positioned in the molding region. ,
A support member made of an elastic material is provided to protrude on at least one of the movable mold and the fixed mold, and the component is elastically sandwiched between the fixed mold and the movable mold via the support member. Configured as
A mold apparatus characterized by that.   2. The gold according to claim 1, wherein the support member is provided so as to freely protrude and retract with respect to at least one of the movable die and the fixed die, and an urging means for urging the support member in the protruding direction is provided. Mold device.   The mold apparatus according to claim 1, wherein the support member is provided only in a fixed mold and not provided in a movable mold.   The metal mold according to any one of claims 1 to 3, wherein an engagement portion with which the component is engaged is provided at a portion excluding the molding region on at least one of the movable mold and the stationary mold. apparatus.   5. The structure according to claim 1, wherein a plurality of eject pins are arranged in parallel on the opposing surface of the movable mold along the peripheral edge of the component while being configured so that the peripheral edge of the component is positioned in the molding region. The mold apparatus of Claim 1.   The mold apparatus according to claim 1, wherein the part is a glass part.

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