JPH0436253Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application field>> This invention relates to an in-mold coating device, and more specifically, the invention relates to an in-mold coating device. This invention relates to an in-mold coating device for IMC paint when injection coating an in-mold coating paint (hereinafter abbreviated as IMC paint) such as a thermosetting paint.

《Prior art》 A thermosetting resin such as SMC (sheet molding compound) is molded in a mold, and with the mold slightly open, IMC paint is injected into the cavity to create a molded product inside the cavity. A method is known in which the thermosetting resin and the IMC coating are hardened in close contact with each other by coating the IMC coating on the resin and then closing the mold again.

In this method, the thermosetting resin is heated and molded in a mold, so the mold is usually kept at a constant temperature (140~140°C).
150℃). Therefore, if the heat inside the mold is transferred to the IMC paint waiting for the next injection in the in-mold coating equipment, the IMC
The gelation of the paint is promoted by this heat, and
When the gelled IMC paint is injected into the cavity, problems such as poor adhesion between the IMC paint and the thermosetting resin occur.

In order to solve such problems, for example, a device according to Japanese Patent Publication No. 59-23552 has been proposed. The outline of this device is constructed as shown in FIG. In between is a cavity 8 for injecting and coating the IMC paint formed by slightly opening the mold after molding the thermosetting resin within the mold. this
In-mold coating equipment 1 that injects IMC paint
0 is buried in the upper mold 2, and this device
A nozzle pipe 14 that accommodates IMC paint 12 for injection, a shutter-off pin 16 slidably disposed in the center of this nozzle pipe 14, and a nozzle pipe 14.
a jacket 18 that surrounds and is spaced from the outer periphery of the jacket;
The tip of the nozzle pipe 14 opens into the cavity 8, and the tip of the shutter-off pin 16 can be extended to the tip of the nozzle pipe 14. When the shut-off pin 16 is moved back from the state shown in FIG. 3, the IMC paint 12 is injected into the cavity 8 from the tip of the nozzle pipe 14 and coated on the thermosetting resin substrate 6. In the conventional apparatus shown in FIG. 3, cooling water 20 was circulated between the nozzle pipe 14 and the jacket 18 in order to prevent the IMC paint in the nozzle pipe 14 from being heated.

<<Problems to be solved by the invention>> However, in this conventional in-mold coating equipment, the jacket that circulates the cooling water is in direct contact with the inner surface of the mold, so it is difficult to sufficiently prevent heat from being transferred to the IMC paint. There was a problem that could not be prevented.

This idea was made in view of these problems, and its purpose is to create an in-mold coating device that can sufficiently prevent the heat of the molding die from being transferred to the IMC paint. is to provide.

《Means for solving the problem》 In order to achieve the above purpose, in this invention,
In order to inject and coat the in-mold coating paint onto the thermosetting resin substrate molded in the mold, a nozzle pipe and a shutter-off pin for opening and closing the tip opening of the nozzle pipe are embedded in the mold. In the in-mold coating apparatus, the outer periphery of the nozzle pipe through which the paint is injected is surrounded by a jacket, cooling water is passed inside the jacket to cool the nozzle, and the jacket is supported with a gap from the mold, Cooling air was passed through the gap.

<Operation> The nozzle pipe is cooled by the cooling water flowing inside the jacket, and cooling air flows between the jacket and the mold, so the inside of the nozzle pipe is cooled.
The IMC paint is doubly isolated from the mold by cooling water and cooling air.

<<Example>> FIG. 1 is a cross-sectional explanatory view showing an example of an in-mold coating apparatus according to the present invention. The in-mold coating device according to this embodiment has two parts: a jacket off pin part 32 and an IMC paint injection nozzle 34.
These members are integrally assembled with the mold at positions adjacent to the cavity within the mold, with their respective tips intersecting each other at right angles.

The shaft-off pin section 32 is composed of a vertically elongated hollow guide block 36, a shaft-off pin 33 tightly housed in the center of the guide block 36 so as to be vertically movable, and a jacket 40 surrounding the guide block 36. The guide block 36 has a small-diameter cylindrical portion 42 at its lower end, and a small-diameter hole 44 is bored in a portion of its lower side surface.
The shutter-off pin 38 has a hollow interior and a closed lower end, so that cooling air is forced into the hollow interior from the upper open end. Note that when the tip end surface of the shaft-off pin 38 and the tip surface of the guide block 36 are flush with each other, the hollow portion 46 formed inside the shaft-off pin 38 is formed by a small diameter hole formed in a part of the lower side surface of the guide block 36. It passes past the hole 44 and reaches the lower end of the shaft-off pin 38. The side wall of the jacket 40 is separate from and surrounds the outer peripheral wall of the guide block 36, and its upper and lower ends are in close contact with the guide block 36. Further, a water supply port 48 and a drain port 50 are opened in the upper part of the jacket 40 to face each other, and cooling water 52 is fed into the jacket 40 from the water supply port, and this cooling water is discharged from the drain port 50 to the outside. It is now being discharged. In the lower part of this jacket 40, there is a large diameter hole 5 in a portion facing the small diameter hole 44 of the guide block.
4 is drilled.

The IMC paint injection nozzle 34 consists of a nozzle tube 56 and a jacket 58 surrounding it.
The nozzle pipe 56 is hollow inside, and its distal end has an outer diameter that fits tightly into the small diameter hole 44 of the guide block 36, and its distal end bulge 60 fits into the large diameter hole 54 of the jacket of the shaft-off pin portion 32. It has an outer diameter that fits tightly. A jacket 58 of this nozzle 34 is separated from and surrounds the outer circumferential surface of the nozzle pipe 56, and a cooling water inlet 62 and a cooling water outlet 64 are opened facing each other at the outer end of the jacket 58. Cooling water 65 is fed into the jacket 58 from the water supply port 62, and this cooling water is sent to the drain port 6.
4, it is discharged to the outside.

Shutoff pin part 32 and IMC as above
As shown in FIG. 2, an in-mold coating device 66 comprising a paint injection nozzle 34 is attached to the left side of an upper mold 68 in this embodiment. When installing, attach the shutter-off pin part 3 on the left side of the upper die 68.
A vertical hole 70 having a diameter larger than the outer diameter of the jacket 40 by a predetermined amount is provided at a predetermined depth at the mounting position of No. 2,
Also, the IMC paint injection nozzle 34 is installed at the installation position of the IMC paint injection nozzle 34.
A horizontal hole 72 having a diameter larger than the outer diameter of the jacket 58 of the paint injection nozzle 34 by a predetermined amount is provided.
is perpendicular to the vertical hole 70, and the tip of the horizontal hole 72 is the vertical hole 70.
It communicates with the inner side of. In addition, a small hole 74 is provided at the center of the deep part of the vertical hole 70, and this small hole 74
4 communicates with the cavity, and its diameter is approximately the same as the diameter of the tip cylindrical portion 42 of the guide block of the shaft-off pin portion. Next, the shutter-off pin part 32
To attach this to the upper mold 68, use this jacket 4.
0 fitted into the open end of the vertical hole 70
6 as a guide is inserted into the vertical hole 70 with a gap from the inner mold wall thereof, and the tip cylindrical portion 42 of the guide block is inserted into the small hole 74 to support the shaft-off pin portion 32 in the vertical hole 70. Also IMC
To attach the paint injection nozzle 34 to the upper mold 68, the jacket 58 of this nozzle is inserted into the side hole 72 with a gap from the inner wall thereof using the collar-shaped support member 78 fitted to the open end of the side hole 72 as a guide. The tip of the nozzle 34 is tightly fitted into the small diameter hole 44 provided in the inner side wall of the guide block of the shuttle pin portion 32, and the tip of the nozzle is aligned with the sliding surface of the shuttle pin 38. At the same time, the bulging portion 60 on the tip side of the nozzle is tightly fitted into the large diameter opening 54 formed on the side of the jacket of the shaft-off pin portion.

The collar-shaped support member 76 of the shaft-off pin portion is provided with a cooling air inlet hole 80 and an air exhaust hole 82. A long pipe 84 is attached to the air inlet hole 80, and its tip is connected to the deep part of the vertical hole 70. has reached. Further, the collar-shaped support member 78 of the IMC paint injection nozzle is provided with an air exhaust hole 86.

With the above configuration, an air passage 88 is formed between the shaft-off pin portion 32 and the vertical hole 70.
An air passage 90 is formed between the IMC paint injection nozzle 34 and the side hole 70.

Long pipe 84 provided in the above-mentioned brim-like support member 76
When cooling air is sent into the air passage, the air that has passed through the long length 84 is discharged deep into the vertical hole 70, part of it passes through the air discharge hole 82 of the collar-shaped support member 76, and part of it passes through the collar of the nozzle. The air is discharged to the outside of the mold through the air discharge hole 86 of the shaped support member 78.

The IMC paint is injected into the mold cavity in the same manner as before, and with the thermosetting resin base installed in the mold cavity, the hydraulic cylinder 92 shown in Fig. 2 is driven to release the shaft-off pin. When the shutter-off pin 38 of
The IMC paint is injected into the mold cavity through the central hollow portion of the guide block 40, forming a coating on the surface of the thermosetting resin substrate.

The mold is normally kept at a constant temperature (140 to 150°C) for molding the thermosetting resin base and curing the IMC paint coated on the thermosetting resin base. The outer periphery of the nozzle pipe 56 is surrounded by a jacket 58, and cooling water is circulated inside the jacket.The jacket 58 is supported with a gap provided from the mold, and cooling air is circulated in this gap. The nozzle pipe 56 is doubly cooled, and the heat of the mold can be sufficiently prevented from being transmitted to the IMC paint. Note that air is a gas and has a low molecular density, and has extremely low thermal conductivity and heat transfer coefficient compared to water, so the gap 90 provided in the pipe between the jacket 58 and the mold is 90
Not only does the air flowing through the mold radiate heat to the outside through the air discharge hole 86, but also the flow of heat from the mold itself is blocked by the gap 90. Next, shut off pin 38
is arranged perpendicularly to the tip of the nozzle pipe 56, and the IMC
The contact area between the paint and the shaft-off pin 38 is reduced, and the inside of the shaft-off pin 38 is made into a hollow section 4.
By setting it to 6, the IMC from the shutter off pin 38
In order to reduce the amount of heat transferred to the paint, cooling water is also circulated inside a jacket 40 that surrounds the shaft-off pin portion 32 at a distance from the guide block 36 in which the shaft-off pin is housed, and this jacket 40 is spaced from the mold. Since the cooling air is circulated through this gap, the shutter-off pin portion 32 is also cooled, and it is possible to further sufficiently prevent the heat of the mold from being transmitted to the IMC paint.

<<Effects of the invention>> As described above, in the in-mold coating apparatus according to the invention, the outer periphery of the nozzle pipe for injecting paint is surrounded by a jacket, cooling water is supplied to the inside of this jacket, and this jacket is also connected to a mold. Since the nozzle tube is supported with a gap between the nozzle tube and the cooling air is circulated through the gap, the paint inside the nozzle tube is sufficiently cooled and is prevented from being heated and gelled by the heat of the mold.

Further, a shutter-off pin is disposed perpendicular to the opening at the tip of the nozzle pipe, and the shutter-off pin is slidably fitted into the hollow part of the hollow guide block, and the tip of the guide block is communicated with the cavity of the mold, Set the outer circumference of the guide block to the second
When the mold is surrounded by a jacket, cooling water is passed inside the second jacket, the second jacket is supported with a gap from the mold, and cooling air is circulated through the gap, as in the conventional method. Compared to the case where the shutter-off pin is located at the center inside the nozzle pipe, the shaft-off pin can also be sufficiently cooled, and the degree of transmission from the shaft-off pin to the paint inside the nozzle pipe is significantly reduced, and the sliding guide of the shutter-off pin and the paint The sealing performance is also extremely good.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the in-mold coating device according to the present invention, and FIG. 2 is an overall explanatory diagram showing the mounting position of the in-mold coating device according to FIG. 1 with respect to the mold, FIG. 3 is an explanatory diagram showing an example of a conventional in-mold coating apparatus. 32...Shut-off pin part, 34...IMC
Paint injection nozzle, 36...Guide block, 38
...Shutoff pin, 40...Jacket, 4
6...Hollow part, 48...Water supply port, 50...Drain port, 52...Cooling water, 56...Nozzle pipe, 58...
... Jacket, 62 ... Water supply port, 64 ... Drain port, 65 ... Cooling water, 66 ... In-mold coating device, 68 ... Upper mold, 76, 78 ... Flange-shaped support member, 80 ... Cooling air Inlet hole, 82...Air discharge hole, 84...Long pipe, 86...Air discharge hole, 88, 90...Air passage.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A nozzle pipe and the tip of the nozzle pipe in order to inject and coat an in-mold coating onto a thermosetting resin substrate molded in the mold. In an in-mold coating device in which a shutter-off pin for opening and closing an opening is embedded, a jacket surrounds the outer periphery of the nozzle pipe through which the paint is injected, and cooling water is passed inside the jacket to cool the nozzle and to cool the nozzle. An in-mold coating device characterized in that the mold is supported with a gap provided therebetween, and cooling air is circulated through the gap. (2) The shaft-off pin is disposed perpendicular to the tip opening of the nozzle pipe, and the shaft-off pin is slidably fitted into the hollow part of the hollow guide block, and the tip of the guide block is fitted into the mold. A second jacket communicates with the cavity, surrounds the outer periphery of the guide block, allows cooling water to pass inside the second jacket, and supports the second jacket with a gap from the mold;
The in-mold coating apparatus according to claim 1, characterized in that cooling air is circulated between the two.