JPH0628877B2 - Synthetic resin product having glass window and its injection molding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a synthetic resin product having a glass window and a method for molding the same, and more specifically, a product having an inorganic glass as a glass window and a synthetic resin product having the inorganic glass inserted therein. Injection molding method.

[Prior Art] Today, various products are manufactured by injection molding because it is easy to mass-produce synthetic resin injection-molded products with high precision in terms of shape and dimensions.

Also, for example, like the waterproof case of a TV camera used to confirm the rear of the vehicle, the side surface which is the body is molded with opaque synthetic resin, but the front of the waterproof case, especially the position corresponding to the lens part of the TV camera is glass. Some products require the provision of transparent parts such as windows.

In many cases, a product requiring such a glass window is provided with a front cover 44 having a through hole 46 through a packing 48 for sealing to a main body portion such as a body portion 42 as shown in FIG. The glass plate 10 is attached by 49, and the glass plate 10 is fixed to the position of the through hole 46 by sandwiching the glass plate 10 with the packing 48 by the front cover.

Packing 48 and glass plate 10 into the body 42 made of synthetic resin.
The work of mounting the front cover 44 and fixing the front cover 44 with a plurality of screws 49 requires a lot of assembly work and it is difficult to improve productivity. There is a demand for insert molding in which the body portion 42 and the front cover 44 are integrally molded by inserting them into a position in the mold.

However, when the glass plate 10 is an inorganic glass, the glass plate 10 is easily broken and it is difficult to perform clamping with a mold.

If the glass plate 10 is an organic glass such as urea resin or acrylic resin, it is relatively hard to break. Therefore, the glass plate 10 and the product body should be integrated by inserting the glass plate 10 and performing injection molding. Was possible (eg
62-128.800).

[Problems to be Solved by the Invention] As described above, a product using an organic glass plate can improve productivity because insert molding can be performed to integrally mold the product by injection molding. In this case, it is difficult to perform a metal vapor deposition process for forming a heater or the like to prevent dew condensation, and in some cases, white turbidity or the like may occur during long-term use to reduce transparency, so a glass window made of inorganic glass is required. There are things.

However, as mentioned above, the inorganic glass is easily broken, and in injection molding the mold is clamped at high pressure and the molten resin is injected at high pressure, so it is extremely difficult to fix the glass plate in the mold without damaging it. Even if the glass plate is fixed in the mold using rubber packing as a cushioning material, the rubber packing is deformed by the flow of the molten resin during injection of the synthetic resin, causing defective molding and damage to the glass plate. There was.

MEANS FOR SOLVING THE PROBLEM The present invention is directed to a case where the peripheral edge portion and the peripheral edge portion of the inorganic glass plate are covered with rubber packing, and metal frame plates are abutted on the front and rear surfaces of the rubber packing. The plate has an inner edge shape that is substantially the same as the inner edge shape of the rubber packing, and the outer edge of the metal frame plate is slightly larger than the outer edge of the rubber packing. Is a synthetic resin product having a glass window of a structure in which a portion excluding the inner edge portion of the metal frame plate is embedded in the synthetic resin together with the peripheral edge portion of the glass plate and the rubber packing. The manufacturing method of the product is that the peripheral edge of the glass plate is covered with rubber packing and the peripheral edge of the glass plate is clamped and fixed by a male mold and a female mold, and when the glass plate is clamped by the mold, the glass plate is Edge of Two metal frame plates having the same shape as the rubber packing, which substantially match the shape, are used. The metal frame plates are positioned in front of and behind the rubber packing, and are arranged in front of and behind the glass plate. Hold it with a male mold and a female mold, and fix it in the mold by protruding the peripheral edge of the glass plate, the outer edge of the rubber packing and the outer edge of the metal frame plate into the cavity of the mold. After that, the product is molded by injecting a synthetic resin into the cavity of the mold.

[Operation] Since the present invention has a structure in which the peripheral edge of the glass plate is covered with rubber packing and the metal plate is brought into contact with the front and rear surfaces of the rubber packing, the glass plate is damaged by being pinched from the front and rear of the metal frame plate It is possible to carry out the injection of the synthetic resin by sandwiching and fixing the glass plate in the injection molding die without the need.

Further, in the manufacturing method according to the present invention, the peripheral edge of the glass plate is covered with the rubber packing and inserted into the mold, and the peripheral edge of the glass plate is held by the mold, so that the glass plate is damaged. Instead, it can be held by a male mold and a female mold, and the molten resin can be prevented from flowing into the front surface or the rear surface of the glass.

Also, when holding the glass plate with the mold through the rubber packing, metal frame plates are placed on the front and rear surfaces of the rubber packing, and the inner edge of each metal frame plate is pressed and held by the mold to hold the glass plate and the metal plate. Since the outer edge of the frame plate is projected into the mold cavity, if the molten resin is injected into the mold cavity to mold the product, the synthetic resin will be the outer periphery of the glass plate and the metal frame plate, The glass plate, the rubber packing, and the metal frame plate can be fixed to the front and rear surfaces of the peripheral portion integrally with the synthetic resin.

Further, in the present invention, since the front and rear surfaces of the rubber packing are fixed so as to be covered with the metal frame plate, the rubber packing is sandwiched between the metal frame plates and prevented from being deformed. It can be prevented from being deformed by the molten resin flowing at high speed.

[Example] In the example of the present invention, as shown in FIG.
A waterproof case 40 for an in-vehicle camera in which a glass window is provided on the front surface and a side body portion 42 is integrally molded with an opaque synthetic resin.
As shown in FIG. 2, a glass plate 10 having an appropriate window shape, a rubber packing 13 conforming to the peripheral shape of the glass plate 10 and a front frame plate 21 which is two metal frame plates. Rear frame plate 25
As shown in FIG. 1, the front and rear surfaces of the peripheral edge portion of the glass plate 10 and the peripheral edge portion are covered with a rubber packing 13, and the front frame plate 21 is brought into contact with the front surface of the rubber packing 13 to make a rubber packing. A waterproof case 40 having a structure in which the rear frame plate 25 is brought into contact with the rear surface of the metal plate 13 and the inner edge of the metal frame plate is left together with the peripheral edge of the glass plate 10 and the rubber packing 13 so that the metal frame plate is embedded in the synthetic resin. is there.

As the glass plate 10, a heater glass for preventing dew condensation having a heater vapor-deposited on the inner surface is used, and the leader line 11 is drawn out into the waterproof case 40.

The rubber packing 13 is formed by using silicon rubber as an annular shape having a shape substantially corresponding to the outer peripheral shape of the glass plate 10, and a groove 17 is formed inside to form a front plate 14 and a rear plate
By forming the glass plate 10 into a U-shaped cross section having 16 and a side wall part 15 and inserting the glass plate 10 into the groove part 17 of the rubber packing 13, the outer peripheral edge part of the glass plate 10 is formed by the side wall part 15 and the glass plate.
The front peripheral portion of the glass plate 10 is covered with the front plate portion 14, and the rear peripheral portion of the glass plate 10 is covered with the rear plate portion 16.

Further, two metal frame plates, a front frame plate 21 and a rear frame plate 25, are used, and the front frame plate 21 has a rubber packing 13 having an inner edge shape.
And the outer peripheral shape is slightly larger than the outer peripheral shape of the front plate portion 14, so that the front frame plate 21 is a front plate portion of the rubber packing 13.
The front frame plate 21 can completely cover the entire front surface of the rubber packing 13 when pressed against the rear frame plate 25.
Also has the inner edge shape of the rear plate portion 16 of the rubber packing 13 and the outer peripheral shape is slightly larger than the rear plate portion 16 and the rear surface of the rubber packing by the rear frame plate 25 when pressed against the rubber packing 13. Make sure that the whole shape is covered.

Using the rubber packing 13 and the two metal frame plates thus formed, after placing the rear frame plate 25 at a predetermined position of the male die 31,
A glass plate 10 whose periphery is covered with rubber packing 13 is attached to a male die 31.
, And the front plate portion 14 is attached at a predetermined position of the female die 33 to clamp the male die 31 and the female die 33, and as shown in FIG. An outer edge portion of the front frame plate 21 and a rear frame plate are formed in a cavity 35 for the waterproof case body formed by the mold 33.
Glass plate covered with 25 outer edges and rubber packing 13
The peripheral edge of 10 is projected, and in this state, molten resin is injected from the injection gate 39 into the cavity 35, and a synthetic resin waterproof case
40 is integrally molded.

After that, if the mold is opened and the waterproof case 40 is taken out from the mold, most of the metal frame plate is left integral with the synthetic resin forming the body part 42 except the inner edges of the front frame plate 21 and the rear frame plate 25. Is embedded in the synthetic resin forming the front surface portion 45, and the peripheral portion of the glass plate 10 is also embedded in the synthetic resin forming the front surface portion 45. Therefore, the synthetic resin having a glass window in the front surface portion 45 of the waterproof case 40. The waterproof case 40 made of aluminum is manufactured by integral molding.

When assembling the glass plate 10 with the rubber packing 13 attached, the front frame plate 21 and the rear frame plate 25 into the mold, after the rubber packing 13 is attached to the glass plate 10, a nitrile rubber adhesive or the like is used. The front frame plate 21 is temporarily bonded to the front surface of the rubber packing 13 and the rear frame plate 25 is temporarily bonded to the rear surface of the rubber packing 13 by using an appropriate adhesive, and the glass plate 10 and the rubber packing 13,
Also, the front frame plate 21 and the rear frame plate 25 may be inserted so as to be integrally attached to the male mold 31.

Further, the shape of the front plate portion 21 is substantially the same as the shape of the front plate portion 14 in the rubber packing 13, and the inner edge and the outer edge of the front plate portion 21 when pressed by the mold are the same as the inner edge and the outer edge of the front plate portion 14. Not only when the shapes are matched, the outer circumference of the front frame plate 21 is made slightly larger than the outer circumference of the front plate portion, and the outer edge portion of the front frame plate 21 is inside the mold cavity 35 more than the outer edge portion of the front plate portion 14. In addition, not only when the rear frame plate 25 has the same inner edge and outer edge as the rear plate portion 16 when the rear frame plate 25 is pressed and held by the mold, the rear frame plate 25 of the rear frame plate 25 is also fixed. In some cases, the outer edge portion may be formed in such a size that it can be projected into the mold cavity 35.

As described above, in this embodiment, since the inner peripheral edge of the front frame plate 21 having an annular shape is pressed by the female mold 33, a pressing force is applied to the rubber packing 13 via the front frame plate 21, so that the mold is pressed. The pressure can be dispersed over the entire surface of the front plate portion 14 in the rubber packing 13, and similarly, the pressing force applied to the inner peripheral edge of the rear frame plate 25 by the male die 31 is dispersed over the entire surface of the rear plate portion 16 in the rubber packing 13. By gripping the glass plate 10 via the rubber packing 13, the glass plate 10 of fragile inorganic glass can be fixed in the mold without damage, and the synthetic resin is injected into the mold cavity 35. Also, when the rubber packing 13 is used, the molten resin can be prevented from flowing around the front and rear surfaces of the rubber packing 13, and a product with a window can be molded and manufactured by injection molding. Because it is held between the plate 21 and the rear plate 25, Prevents deformation during inflow of melting resin, in which it is possible to reliably prevent the molten resin begins to see Eating the front or rear surface of the rubber packing 13.

In addition, each outer edge of the front frame plate 21 and the rear frame plate 25 is rubber-packed.
If the outer periphery of both metal frame plates is made to project into the mold cavity 35 more than the outer edge of the rubber packing 13, the rubber when the molten resin is injected is made to protrude. It is possible to more reliably prevent the deformation of the packing 13 and further reduce the risk of defective molding of the product.

[Effects of the Invention] In the molded article with a glass window according to the present invention, the peripheral portion of the inorganic glass plate is covered with rubber packing, and a metal frame plate is abutted on the front and rear surfaces of the rubber packing and embedded in a synthetic resin. Due to the structure, the peripheral edge of the glass plate can be held via the metal frame plate and the rubber packing, and the glass plate can be held and fixed in the mold for injection molding without damaging the glass plate. This enables insert molding.

Further, in the method according to the present invention, since the peripheral edge of the glass plate is covered with rubber packing and inserted into the mold, the glass plate, which is easily damaged, can be easily fixed in the mold of the injection molding machine. Since the front and rear surfaces of the rubber packing are held by being held by the metal frame plate, it is possible to prevent the rubber packing from deforming and causing defective molding during injection molding, and to integrally manufacture it as a synthetic resin product embedded with inorganic glass. Is an injection molding method capable of

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a waterproof case of a camera manufactured according to the present invention, and FIG. 2 is a view showing a glass plate, a rubber packing and a metal frame plate used in an embodiment of the present invention, and FIG. FIG. 4 is a view showing a state in which a glass plate or the like is fixed in a mold, FIG. 4 is a perspective view of a manufactured waterproof case, and FIG. 5 is an exploded view showing a main part of a conventional waterproof case. 10 …… Glass plate, 13 …… Rubber packing, 21 …… Front frame plate, 25 …… Rear frame plate, 31 …… Male mold, 33 …… Female mold, 35 …… Cavity, 40 …… Waterproof Case, 42 …… Waterproof case 40 body, 45 …… Waterproof case front part.

Claims (2)

[Claims] 1. A metal in which the entire outer peripheral edge of the inorganic glass plate and the front and rear surfaces at the peripheral edge of the glass plate are covered with rubber packing, and the front and rear surfaces of the rubber packing substantially match the peripheral shape of the glass plate. The frame plate is brought into contact, and the metal frame plate is embedded in the synthetic resin together with the peripheral edge of the glass plate and the rubber packing, leaving a small inner edge, and the inner edge shape of the metal frame plate is substantially the same as the inner edge shape of the rubber packing. Match, on the other hand,
A synthetic resin product having a glass window, characterized in that the outer edge of the metal frame plate is approximately the same depth as the outer edge of the rubber packing or is deeper than the outer edge of the rubber packing and embedded in the synthetic resin. 2. An inorganic glass plate having a peripheral edge portion covered with a rubber packing, having an outer peripheral edge that substantially conforms to the peripheral edge shape of the glass plate and is slightly larger than an outer peripheral edge of the rubber packing, and an inner edge of the rubber packing. A metal frame plate having substantially matching inner edges is positioned on the front surface and the rear surface of the rubber packing, and the inner edges of both metal frame plates are pressed and held by a male mold and a female mold, thereby interposing the metal frame plate and the rubber packing. After holding the glass plate in the mold by holding it near the periphery of the glass plate, inject the synthetic resin into the cavity of the mold, and use the synthetic resin together with the outside of the periphery of the glass plate. An injection molding method for a synthetic resin product having a glass window, characterized in that a glass plate is fixed in a synthetic resin molded product by integrally covering a rubber packing and a metal frame plate by covering both peripheral edge positions.