JP2540092Y2 - Powder slush molding equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder slush molding apparatus, and more particularly to a trim seal for a molded skin.

[0002]

2. Description of the Related Art In powder slush molding using powder resin as a raw material, a powder resin is supplied into a mold, and the powder resin is adhered, melted, and cured in a heated and cooled mold to form a resin skin. It is a molding method. The equipment used for this molding is
It mainly consists of a mold that can be heated and cooled, a bucket that stores the powder resin, and a device that rotates them. In the molding step, the powder resin is heated by the high-temperature mold surface, the resin is melted along the mold, cooled, and molded. Therefore, the temperature of the mold at least on the molding surface on which the desired resin skin is molded can be sufficiently adjusted. However, the mold has not only a molding surface but also a peripheral portion around the molding surface for attaching the mold. The surrounding area does not need to be heated, but is preferably at room temperature or lower. If the temperature is equal to or lower than room temperature, even if the powder resin is supplied to the peripheral portion, the resin is in a semi-molten state and does not adhere. However, it is difficult to clearly distinguish a portion requiring temperature control from a portion not requiring temperature control in terms of thermal efficiency, and it is not actually performed. When the temperature of the molding surface is adjusted, the temperature around the molding surface increases and decreases incidentally. When the powder resin is supplied to the peripheral portion, a part thereof is melted, but becomes semi-melted toward the periphery. If the cooling is performed in that state, it becomes difficult to handle at the time of removing the mold or trimming. Therefore, in the prior art, in order to supply the resin to the mold, the sealing is performed simultaneously when the openings of the mold and the bucket are brought into close contact with each other. That is, a sealing material is attached to the above-mentioned mating portion of the bucket, and the sealing material hits a sealing surface of a mold. Thus, even when the powder resin is supplied into the mold, an unnecessary portion is not supplied, and a molded product in a desired range can be obtained.

[0003]

However, when the bucket and the mold are assembled at a predetermined position, the above-mentioned sealing material generates a repulsive force by being sandwiched by a certain gap, thereby exhibiting a sealing function. . Therefore, if the sealing material loses elasticity due to heat or the like, the sealing property is impaired. Further, even if the fit of the sealing surface is deteriorated beyond the limit due to the distortion of the bucket or the like, the sealing property is naturally lost, and the powder resin is supplied to the unnecessary portion. In such a case, not only does it take time to remove the molded product, but also, in some cases, it is necessary to clean the resin that has hardened and remained on the inner surface of the mold while remaining semi-molten.

[0004] In order to solve the above-mentioned problems, an object of the present invention is to provide a bucket structure to which a sealing material is attached, which can provide a sealing property that does not change with time.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention makes contact with a bucket for accommodating a powder resin and each opening of a temperature-adjustable mold, and rotates the opening to rotate the resin skin. In a powder slush molding apparatus for molding, a bucket that is slidably supported via a guide portion is provided on a frame that is detachable from the opening side of the mold, and the opening of the bucket is Forming a shape substantially along the sealing surface, attaching a sealing material to the formed opening, providing a device for pressing the bucket on the frame, and the device pressing the sealing material together with the bucket against the sealing surface of the mold. To obtain a powder slush molding apparatus which enables the above.

[0006]

In the molding process of the apparatus according to the present invention, the process from when the molded product is released to when the powder resin in the bucket is supplied into the mold is as follows. First, the bucket frame is assembled to the mold at a predetermined position such that the openings of the mold and the bucket face each other. While the bucket is guided toward the mold with the guide pin,
When pressed by an air cylinder or the like, the sealing material is pressed against the sealing surface of the mold. The sealing material is pressed against the mold with a predetermined force from when the powdered resin is supplied into the mold to when the excess resin is collected in the bucket.
After the sealing is completely performed as described above, when the bucket in close contact with the mold rotates together, the powdered resin is supplied only to a predetermined area in the mold. At the time of manufacturing the device, even when the opening of the bucket is insufficiently formed and the fitting with the mold is not good, such sealing performance is exhibited. Also,
The sealing material loses elasticity due to aging or heat history, but during that time, the sealing material deforms and hardens along the mold. Even after such a change, the sealing material is pressed against the mold by an air cylinder or the like, so that the sealing property is sufficiently maintained until the sealing material is completely deteriorated and needs to be replaced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a powder slush molding apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a powder slush molding apparatus according to another embodiment of the present invention. A pipe 2 connected to a temperature control device using oil as a heat medium is brazed to the mold 1. The mold 1 and the frame 6 are fastened by the clamp 3 with the opening of the mold 1 and the opening 9 of the bucket 4 facing each other. The frame 6 is provided with a guide pin 5a, and the guide pin 5a and the guide bush 5b of the bucket 4 form a guide portion 5 and slidably support the bucket 4. The opening 9 of the bucket 4 is formed along the sealing surface 10 of the mold, and the sealing member 8 is further attached. An air cylinder 7 is connected to the outside of the bottom of the bucket 4, and the air cylinder 7 is attached to the frame 6. The piping of the air cylinder 7 is connected to the outside of the apparatus via a rotary joint (not shown).

In the embodiment of the present invention, silicone rubber is used for the sealing material 8. However, another heat-resistant elastic body, for example, a polyurethane foam or the like may be used. Although an air cylinder is used as a device for pressing a bucket against a mold, other devices such as an air bag and a hydraulic cylinder may be used. Further, since the bucket does not necessarily need to be pulled back, instead of the air cylinder or the like, the bucket shown in FIG.
, A compression spring may be provided between the bucket and the frame.

[0009]

The following effects can be obtained in the powder slush molding apparatus of the present invention. Usually, taking into account the sealing properties of the bucket, the bucket is made for each mold according to its shape. At that time, distortion usually appears in a bucket or a frame made by welding a steel material, and distortion may also appear in a sealing surface which is sufficiently adjusted at the time of production.
Even so, when the elastic sealing material is pressed against the mold together with the bucket, the distortion is temporarily eliminated, and the sealing property is sufficiently ensured. In addition, since the sealing material can be used until it completely deteriorates even after losing elasticity,
The number of replacements may be small, and the number of man-hours spent for maintenance work is also reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a powder slush molding apparatus according to an embodiment.

FIG. 2 is a sectional view of a powder slush molding apparatus according to another embodiment.

[Explanation of symbols]

1 ... mold, 2 ... pipe, 3 ... clamp, 4
... bucket, 5 ... guide part, 5a ... guide pin, 5b ... guide bush, 6 ... frame,
7 ... Air cylinder, 8 ... Seal material, 9 ...
-Opening, 10 ... sealing surface, 11 ... powder resin,
12 ・ ・ ・ Compression spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A powder slash molding apparatus for molding a resin skin by closely contacting and rotating a bucket for accommodating a powdered resin and an opening of a temperature-adjustable mold, wherein the opening of the mold is provided. A bucket that is slidably supported via a guide portion is provided on a frame detachable from the side, and an opening of the bucket is formed substantially along a sealing surface of a mold. A powder slush molding device, wherein a device for attaching a seal material to a portion and pressing a bucket is provided on a frame, and the device can press the seal material together with the bucket against a seal surface of a mold.