JPH0536645Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a sealing structure for a resin molding mold, and more specifically, the invention relates to a sealing structure for a resin molding mold, and more specifically, to a sealing structure for a resin molding mold. Regarding the seal structure of a molding die.

BACKGROUND TECHNOLOGY For example, regarding the rear side window glass (hereinafter simply referred to as window glass) 1 of an automobile shown in FIGS. 3 and 4, a frame is pre-framed around the periphery of the window glass 1 using the modular construction method. Wind molding 2 as a component
The window glass 1 with the window molding 2 is integrally molded, and the window glass 1 with the window molding 2 is attached to the vehicle body using fixing means such as screws.

When molding the wind molding 2 as a frame member, as shown in FIG. 5, the parting line S1 of the wind molding 2, A mold is used in which rubber seal blocks 5 and 6 are arranged in the part that determines S2 (see Fig. 4), and by bringing the seal blocks 5 and 6 into elastic contact with the window glass 1 during mold clamping, the space in the product part is reduced. (Closed space) R is formed, and by filling this product space R with a predetermined resin material P, the window molding 2 is integrally molded using the window glass 1 as an insert.

At this time, the seal blocks 5 and 6 come into close contact with the window glass 1 due to their elastic deformation, and a resin material P is formed between the window glass 1 and the seal blocks 5 and 6.
This function works to prevent burrs from entering and generating burrs (a similar technique is disclosed in, for example, Japanese Utility Model Publication No. 58-52105).

Problems to be Solved by the Invention However, in the conventional structure, even if the seal blocks 5, 6 have been aligned in surface shape with the mating window glass 1 in advance, the gap between the seal blocks 5, 6 and the window glass 1 is Since the seal blocks 5 and 6 only rely on the elastic deformation of the seal blocks 5 and 6, at the same time as mold clamping, in other words, if the parting surfaces 3a and 4a of the cavity block 3 and the core block 4 come into close contact with each other, the seal block 5 , 6 and the window glass 1, and there is no guarantee that the seal blocks 5, 6 will be in even contact throughout the entire circumference of the window glass 1.

Therefore, depending on the dimensional accuracy of the window glass 1 or the alignment accuracy for matching the above-mentioned surface shapes, burrs may still occur due to poor sealing, and it is necessary to make prototypes and make modifications until the mold can be used as an actual production mold. In addition to requiring a large amount of man-hours and time, the intended purpose of forming the window molding 2 cannot be achieved unless the dimensional accuracy of the window glass 1 itself is more strictly controlled.

In addition, there is a risk that the sealing performance will deteriorate due to the seal blocks 5 and 6 becoming stale, and problems remain in terms of durability.

On the other hand, although a certain degree of burr prevention effect can be expected by increasing the hardness or spring constant of each seal block 5, 6, in particular, as shown in FIGS. If the sealing blocks 5 and 6 are not in the same position on both sides of the glass and are offset without facing each other, it is undesirable because the glass 1 is likely to be damaged.

The object of the present invention is to provide a seal structure that solves the above problems by applying pressure after mold clamping to forcibly bring the seal block into contact with the glass.

Means for Solving the Problems The present invention clamps a fixed mold and a movable mold, clamps a sheet of glass between them under pressure, inserts this glass, and attaches a frame member to the periphery of the glass. In the sealing structure of a resin molding die that is integrally molded, a frame member is attached to one of the fixed mold and the movable mold to be in pressure contact with the glass during mold clamping and between the glass and each mold. While providing a seal block made of an elastic material to define a product space for
The other of the fixed and movable molds is provided with a seal block made of an elastic material that faces the seal block on the one mold side and is movable in the direction of pressing the glass, and that presses against the glass during mold clamping. ,
On the outer circumferential side of the seal block, there is an elastic material that presses against the glass during mold clamping and defines a product space for the frame member between the glass and each mold together with the seal block on the one mold side. The seal block is provided so as to be movable in the glass pressing direction.

A pressure tube is provided between the pair of seal blocks on the other mold side and the other mold, which is expanded by the pressurized fluid introduced after the mold is clamped and applies pressure to the seal block to press the glass. It is characterized by the fact that it has been established.

For example, compressed air, oil, or the like is used as the pressurized fluid.

Effect: According to this structure, the pressure tube is not pressurized during mold clamping, so even if the seal block, which can be displaced in the pressure direction, comes into contact with the glass, it is possible to prevent the generation of burrs. Not in a sufficient seal condition. Therefore, when pressurized fluid is introduced into the pressure tube after mold clamping, the pressure tube expands, and only at this point does the seal block come into pressure contact with the glass, creating a sealing condition sufficient to prevent the occurrence of burrs.

The above sealing performance is achieved by pressurizing the glass with a total of three seal blocks: a pair of seal blocks backed up by the pressure tube and a single seal block not backed up by the pressure tube. It is possible to prevent damage to the glass while maintaining it.

Embodiment FIG. 1 is a diagram showing a more specific embodiment of the present invention, and similarly to FIG. 5, it shows a mold structure for integrally molding a window molding 2 on a rear side window glass 1 of an automobile. ing. In the figure, 1 is a window glass, 3 is a fixed cavity block, and 4 is a movable core block.

In the portion of the core block 4 facing the seal block 15 on the cavity block 3 side,
A seal block 16B formed of an elastic body such as rubber is provided, and the wind molding 2 is located on the outer peripheral side of the seal block 16B.
A part that determines the parting line S2 (see FIG. 4),
In other words, a seal block 16 made of an elastic material such as rubber is provided in a portion defining the product space R.
A is placed.

These seal blocks 16A and 16B are both surface-shaped in advance so that they come into close contact with the window glass 1 without any gaps, and the seal block 15 on the cavity block 3 side is fitted and supported in the groove 7. The seal blocks 16A and 16B on the side of the core block 4, which will be described later, are set to come into pressure contact with the window glass 1 with a predetermined deflection amount only when the seal blocks 16A and 16B on the side of the core block 4 are in a normal pressurized state.

On the other hand, the seal block 16 on the core block 4 side
A and 16B are the seal blocks 16A and 16B.
It is vertically movably fitted and supported in a groove 8 that is sufficiently deeper than the height of the tube, and a flexible pressure tube 9A or 9B is disposed on the back side thereof.
One end of the pressure tubes 9A, 9B is closed, and hydraulic pressure, which is a pressurized fluid, is introduced from the other end via a solenoid valve 10. 1
1 is a hydraulic power source, 12 is a pressure reducing valve, and 13 is a pressure switch.

Next, the molding procedure of the molding die configured as described above will be explained with reference to FIG. 2.

First, a platen (not shown) is lowered and the cavity block 3 and core block 4 are moved as shown in FIG.
When the molds are clamped, the seal blocks 15 and 16
Both tubes A and 16B come into pressure contact with the window glass 1 with a very slight pressure force due to the elastic force of the pressure tubes 9A and 9B themselves.

When it is confirmed that the mold has been clamped, the solenoid valve 10 is switched, and hydraulic pressure is introduced into the pressure tubes 9A and 9B. When the pressure tubes 9A and 9B are pressurized by this oil pressure, the pressure tube 9
A, 9B expands and seal blocks 16A, 16
Press B down. This allows each seal block 1
6A and 16B are brought into close contact with the window glass 1 with a predetermined pressure (sealing pressure), and at the same time, the seal block 15 is also brought into close contact with the window glass 1 by the pressure reaction force of the pressure tubes 9A and 9B, and these seals are A product space R is defined by the sealing action of the blocks 15, 16A, and 16B.

The pressures in the pressure tubes 9A and 9B may be the same pressure or may be made different depending on molding conditions and the like.

The pressure switch 13 confirms that the pressure in the pressure tubes 9A and 9B has increased to the set pressure.
When detected, the resin material P is injected and the product part space R is filled with the molten resin material P.

After the injection is completed, the pressure tubes 9A and 9B are
The time for pressurization is controlled by a timer as shown in FIG. 2, and the timer for releasing the pressure and the timer for cooling are activated at the same time as injection ends.

After this, cooling progresses and the pressure tubes 9A, 9
When the pressurization release timer B times up, the solenoid valve 10 switches, and the pressurization tubes 9A and 9B
While the hydraulic pressure is cut off, when the cooling timer expires later than that, the platen rises, and the window glass 1 with the wind molding 2 integrally molded is removed from the cavity block 3 by an ejector not shown. taken out.

In this way, after the mold is clamped and before the resin material P is filled, the seal blocks 16A and 16B are forcibly pushed down by the pressure of the pressure tubes 9A and 9B to seal the gap with the window glass 1. As a result, each seal block 15, 16
Since A and 16B are displaced while faithfully following the shape of the window glass 1, each seal block 15 and 1
The adhesion state between 6A and 16B is stabilized, preventing the occurrence of burrs and closing the window molding 2 and window glass 1.
The parting lines S1 and S2 can be more clearly drawn.

Moreover, by arranging the seal block 15 and the seal block 16B facing each other and providing another seal block 16A, it is possible to reliably prevent the occurrence of burrs and to prevent the window glass 1 from being damaged. .

Effects of the invention As described above, according to this invention, apart from the mold clamping action, the seal block is forcibly displaced by the pressure tube to make it adhere to the glass, so that the seal block faithfully follows the shape of the glass, stabilizing the adhesion state of the seal block and eliminating any variation in the adhesion state around the circumference of the glass. This prevents the occurrence of burrs and makes it possible to make the parting line between the glass and the frame member clearer. It also improves the durability of the seal block itself, thereby extending its lifespan.

In addition, even if there is a dimensional error in the glass or an error in the surface shape alignment of the seal block, the structure is such that the seal block itself is pressurized and forcibly displaced, so the above errors can be absorbed, and mold manufacturing This makes it easier to maintain the dimensions of the glass, and also reduces the number of man-hours required to manage the dimensions of the glass.

Furthermore, by arranging a seal block that is backed up by a pressure tube and a seal block that is not backed up by a pressure tube, and then providing a seal block that is backed up by another pressure tube, the above-mentioned burrs can be eliminated. This has the effect of preventing damage to the glass while reliably preventing the occurrence of.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing an embodiment of the present invention;
Figure 2 is a time chart during molding using the mold structure of the present invention, Figure 3 is a front view of a rear side window glass of an automobile with an integrally molded wind molding, and Figure 4 is a cross section taken along the - line in Figure 3. FIG. 5 is a sectional view showing an example of a conventional mold structure. 1...Rear side window glass (glass),
2... Wind molding as a frame member, 3... Cavity block as a fixed type, 4... Core block as a movable type, 9A, 9B... Pressure tube, 15, 16A, 16B... Seal block, P ...Resin material, R...Product department space.

Claims (1)

[Claims for Utility Model Registration] A fixed mold 3 and a movable mold 4 are clamped together, a plate-shaped glass 1 is held between them under pressure, and a frame member is attached to the periphery of the glass 1 using this glass 1 as an insert. In the sealing structure of the resin molding die in which the molds 2 and 2 are integrally molded, one mold 3 of the fixed mold 3 and the movable mold 4 is pressed against the glass 1 at the time of mold clamping, and the glass 1 and each mold are pressed together. A seal block 15 made of an elastic material is provided between the molds 3 and 4 to define a product space R for the frame member 2, while the other mold 4 of the fixed mold 2 and the movable mold 3 is provided.
is provided with a seal block 16B made of an elastic material that faces the seal block 15 on the one mold 3 side and is in pressure contact with the glass 1 during mold clamping so as to be movable in the glass pressing direction.
On the outer periphery of the mold, there is a seal block 15 which presses against the glass 1 during mold clamping to define a product space R for the frame member 2 between the glass 1 and each of the molds 3 and 4. A seal block 16A made of an elastic body is provided so as to be displaceable in the glass pressing direction, and a seal block 16A, which is introduced after mold clamping, is provided between the seal blocks 16A, 16B and the mold 4 in which the seal blocks 16A, 16B are installed. A sealing structure for a resin molding die, characterized in that pressure tubes 9A and 9B are provided which are expanded by pressurized fluid and apply glass pressure contact force to the seal blocks 16A and 16B.