JPH0422977Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is designed to sandwich a tempered glass plate whose entire surface is broken into fragments or fine powder when broken between the joint of a cavity mold and a core mold, and to This invention relates to an improvement in an injection molding die used for integrally molding a frame made of synthetic resin with synthetic resin injected into a cavity space.

Conventional technology Conventionally, in this type of injection molding mold, a sealing member is placed at the joint between the cavity mold and the core mold, and a synthetic resin is placed in the cavity space located along the periphery of the glass plate held by the sealing member. It is known that a frame made of synthetic resin is integrally formed with a plate glass by injection (Utility Model Application No. 175422/1983).

In this injection molding mold, when using a tempered plate glass whose entire surface breaks into fragments or fine powder when broken, the shape of the tempered glass varies, so when the cavity mold and core mold are clamped, the tempered glass It is easy to cause damage to the entire surface of the product into fragments or fine powder. If the synthetic resin is injected into the cavity space while the cracks in the tempered glass are left untreated, the synthetic resin will flow into the cavity space, drawing in broken or fine glass powder, causing the glass to damage the cavity surface. It will end up being put away.

Problems to be Solved by the Invention The present invention is configured to prevent breakage of the tempered glass due to mold clamping as much as possible, and to be able to reliably detect breakage of the strengthened glass even if the breakage occurs in the tempered glass. The purpose is to provide injection molding molds.

Means for Solving the Problems In the injection molding mold according to the present invention, an escape space is provided on the opposing center sides of both the cavity mold and the core mold to prevent the mold surfaces from coming into contact with the glass surface of the tempered plate glass. A detector for detecting breakage of the reinforced plate glass is installed inside the escape space, and this detector is connected to a control means for controlling the injection of synthetic resin, and the injection of the synthetic resin is controlled by the signal from the detector. configured to control.

Function In this injection molding mold, in order to provide an escape space on the opposing center side of each mold of the cavity mold and core mold to prevent the mold surface from coming into contact with the glass surface of the tempered plate glass. By minimizing the contact area between each mold surface and the glass surface of the tempered plate glass, the frequency of breakage of the tempered glass can be suppressed, and when the tempered plate glass is broken, glass powder from the tempered plate glass can fall into the recess of the escape space. Post-processing such as removing the glass powder from the place where it is stored can be easily performed. In addition, a detector is installed inside the escape space to detect damage to the tempered glass.
The detector can be easily installed and has a degree of freedom in installation. Furthermore, even if the reinforced glass is broken when the cavity mold and core mold are clamped together, a detector will detect this and issue a signal to prevent synthetic resin from being injected into the cavity space. Since it is possible to notify the user to open the mold and remove the glass powder, it is possible to prevent the occurrence of damage to the cavity surface.

Embodiments The following description will be made with reference to the accompanying drawings.

The injection molding die shown in Figure 1 is used to mold a synthetic resin frame integrally around the periphery of tempered glass, which can be broken into fragments or fine glass powder on its entire surface when broken. has been done.

This injection molding die includes a cavity mold 1 and a core mold 2, and escape spaces 3 and 4 are formed at opposing central sides of each mold. These relief spaces 3 and 4 are provided in both molds 1 and 2 in anticipation of shape errors in the tempered glass that occur because it is difficult to control the shape, thickness, etc. of the tempered glass during manufacturing.
When the molds are clamped, the opposite center sides of the cavity mold 1 and the core mold 2 in the axial direction of the tempered glass sheet G are arranged so that the tempered sheet glass G is not damaged due to each mold surface coming into contact with the glass surface of the tempered sheet glass G. It is formed by providing a recess in the. The relief spaces 3 and 4 are preferably formed wide in the plane direction so that the width in the plane direction of the mating parts 5 and 6 that sandwich the later-described reinforced plate glass G is set as narrow as possible.

Along the peripheries of these relief spaces 3 and 4, mating parts 5 and 6 for sandwiching the tempered plate glass G are provided, and the tempered plate glass G is positioned adjacent to the mating parts 5 and 6.
A cavity space 7 is provided along the periphery. A nozzle touch 9 is connected to this cavity space 7 via a sprue 8, and by injecting synthetic resin from the nozzle touch 9 into the cavity space 7, a synthetic resin frame is integrally formed around the periphery of the reinforced plate glass G. It is configured like this.

In this injection molding mold, as described later, a detector for detecting breakage of the reinforced plate glass G is installed inside the relief space 3 and/or 4 formed on the opposing center sides of the cavity mold 1 and the core mold 2. Equipped. When installing the detector inside the escape space 3 and/or 4, the detector can be easily installed because the escape space 3 and/or 4 is formed as a recess, and can be installed freely within the recess space. You can do it like this.

As the detector, as shown in FIG. 1, a suction device 10 that detects breakage of the reinforced glass plate G by vacuum suction and changes in the degree of vacuum can be installed. This suction device 10 is equipped with a suction cup 11 that sucks and holds the tempered glass plate G at approximately the center of the escape space 4 of the core mold 2, and the suction cup 11 is moved toward the cavity mold 1 by a compression spring 12 to the back side of the tempered glass plate G. It is supported so that it protrudes a little more than the original. A vacuum pressure pipe 13 is connected to this suction cup 11 through the core mold 2, and a vacuum degree detector 1 is connected to the vacuum pressure pipe 13.
4. A vacuum pump 15 is connected. The vacuum level detector 14 constantly monitors the vacuum level of the suction cup 11 that sucks the tempered plate glass G, and since the vacuum level changes when the strengthened plate glass G is broken, control is performed by detecting this change in the vacuum level. Control panel of injection molding machine (not shown)
is connected to issue a command to stop resin injection. In order to be able to quickly detect changes in the vacuum pressure, the cavity mold 1 is preferably provided with a vent hole 16 that communicates the escape space 3 with the outside air.

Instead of this detector 10, a detector 20 as shown in FIG. 2 can be installed. The detector 20 includes a light emitting element 2 that detects breakage of the tempered glass G based on a change in the amount of light transmitted through the tempered glass G.
1 and a light receiving element 22. These elements 21 and 22 are arranged in the escape spaces 3 and 4 of the cavity mold 1 and the core mold 2, respectively, and when the light receiving element 22 receives a certain amount of light or more, the control panel of the injection molding machine (see Fig. (not shown) is connected to issue a command to stop resin injection.

In addition, a detector 30 as shown in FIG.
It can also be attached inside either of the escape spaces 3, 4. The detector 30 includes a contact 31 whose tip side contacts the reinforced plate glass G, and in the illustrated embodiment, the contact 31 is resiliently supported by a compression spring 32 so as to protrude from the core mold 2 toward the cavity mold 1. A detector 30 is therefore provided. The contact 31 of the detector 30 moves upward when the reinforced glass sheet G is broken, and when the deflection of the contact 31 exceeds a certain value, the control panel of the injection molding machine (not shown) ) is connected to issue a command to stop resin injection.

In the injection molding mold configured as described above, the synthetic resin is It is possible to reliably control the injection to be stopped at the same time. When the tempered glass sheet G is damaged during mold clamping, most of the glass powder from the tempered glass sheet G falls down in the relief space 4 of the core mold 2 and is contained, which not only facilitates post-processing such as removal work, but also
The cavity mold 1 and the core mold 2 can be opened to accurately discharge the glass powder of the reinforced plate glass G.

Effects of the Invention As described above, according to the injection molding mold according to the present invention, it is possible to suppress the breakage of the reinforced plate glass in the escape spaces provided in each mold, and the detector for detecting the breakage can be installed in the escape spaces. It can be easily installed inside, and by stopping the injection of synthetic resin based on the command from the detector, it is possible to prevent the cavity surface from being damaged due to breakage of the reinforced glass. Glass powder can also be easily discharged.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an injection molding mold according to the present invention, and FIGS. 2 and 3 are explanatory diagrams showing another embodiment of a detector installed in the same mold. 1... Cavity type, 2... Core type, 3... Cavity type escape space, 4... Core type escape space, 5, 6... Joining part, 7... Cavity space,
10, 20, 30...Detector, 11...Sucker, 2
1... Light emitting element, 22... Light receiving element, 31... Contactor, G... Tempered glass plate.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Tempered glass whose entire surface is broken into fragments or fine powder when broken is clamped by clamping it between the joint of the cavity mold and core mold, and the peripheral edge of the tempered glass is An injection molding mold configured to detect damage to the reinforced glass sheet caused by clamping of the cavity mold and core mold when integrally molding a frame made of synthetic resin with synthetic resin injected into the cavity space. In the mold,
An escape space is provided on the opposing center sides of both the cavity type and core type molds to prevent the mold surfaces from coming into contact with the glass surface of the tempered plate glass, and a detector is installed inside the escape space to detect breakage of the tempered plate glass. An injection molding mold characterized in that the detector is connected to a control means for controlling the injection of synthetic resin, and the injection of the synthetic resin can be controlled by a signal from the detector. (2) The injection molding mold according to claim 1, wherein the detector is constituted by a suction device that detects breakage of the reinforced plate glass by vacuum suction and detects breakage of the strengthened plate glass by a change in the degree of vacuum. . (3) The injection molding mold according to claim 2, wherein the suction device has a suction cup for suctioning and holding the reinforced plate glass. (4) Injection molding according to claim 1, wherein the detector comprises a light-emitting element and a light-receiving element that detect breakage of the tempered plate glass based on changes in the amount of light transmitted through the tempered plate glass. Mold. (5) The injection mechanism according to claim 1, wherein the detector is constituted by a contact that detects breakage of the reinforced plate glass based on the amount of deflection of the tip end that comes into contact with the reinforced plate glass. Molding mold.