JPH0428209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a slush mold used in slush molding used in manufacturing the skin of an automobile instrument panel.

[Prior art] Slush molding is a method in which a powder slush raw material is supplied to the mold surface of a heated slush mold, brought into contact with it, melted and adhered to form a molten resin film, and then cooled to obtain a film-like molded product. It is used to manufacture the skin of vehicle interior materials. In this slush molding, particular attention is paid to the heating and cooling methods of the slush mold, since these methods have a great effect on the quality of the resulting molded product.

Heating of the slush mold is carried out, for example, by bringing a high temperature liquid heat medium, hot air, etc. into contact with the back surface of the mold. In the case of medium heating, heating is performed by flowing a heating medium through a medium flow path formed near the mold surface of the mold.

In the case of hot air heating, as shown in Fig. 3, the mold body 9 is held in a frame 8 through which hot air can freely pass, and the whole is held in a hot air heating furnace for a certain period of time to heat it. are doing. Since it is necessary to uniformly heat the entire mold body 9, the mold body 9 generally has a substantially uniform thickness throughout.

[Problems to be Solved by the Invention] In the conventional method of heating a slush mold as described above, in the case of medium heating, the structure of the mold becomes complicated, such as by providing a medium passage, and it takes time to manufacture the mold. There is also the problem that the mold becomes large and difficult to handle. On the other hand, in the case of hot air heating, the mold body can be made thinner, less material is used for the mold, and it is easy to handle, so it is widely used.

However, since hot air is generally blown from only one direction, heating is delayed in areas that are blind spots in the direction of hot air blown, such as the recess 10 on the back surface of the mold body 9 in Fig. 3, and the resin is not melted properly. There is a problem. Conventionally, therefore, the heating time was increased until such a portion reached a predetermined temperature, but this resulted in the problem of wasting energy.

The present invention was made in view of this problem, and in the case of hot air, the mold body can be heated uniformly,
The purpose of the present invention is to provide a slush mold that can save energy.

[Means for Solving the Problems] The slush mold of the present invention includes: a mold body having a mold surface processed into a predetermined shape; a frame provided around the mold body for holding the mold body; , and fins held by the frame, the fins controlling the flow direction of hot air blown onto the mold body from outside the frame.

As the mold body, a conventional mold body for hot air heating can be used as is.

The mold body is held by the frame. As this frame, a conventional frame through which hot air can freely pass can be used as is. The mold body may be held inside the frame, or the mold surface or back surface of the mold body may be included in one surface of the frame. It is also preferable to have a structure in which the mold body is detachable from the frame and can hold different types of mold bodies.

The greatest feature of the present invention is that the frame is provided with fins.

These fins are for controlling the flow direction of the hot air blown onto the mold body, and there are no particular restrictions on their number or the positions at which they are provided. For example, if there is a blind spot such as a recess on the surface of the mold body onto which the hot air is blown, the fins are oriented so that the hot air hits the blind spot. Furthermore, if the surface of the mold body onto which the hot air is blown has a surface area distribution such as uneven parts and flat parts, it is preferable to orient the mold body so that a large amount of the hot air is blown onto the part with the large surface area.

It is desirable that the angle of the fins be adjustable. In this way, it is possible to flexibly accommodate mold bodies having different shapes, and one frame can be used for multiple types of mold bodies.

In the slush molding mold of the present invention, after hot air is blown onto the mold surface or the back surface of the mold body to heat it, the powder slush raw material is supplied to the mold surface of the mold body, and as in the past, it is melted. A resin film can be formed and cooled to obtain a film-like molded body.

[Operations and Effects of the Invention] In the slush mold of the present invention, the flow direction of hot air can be controlled by the fins provided on the frame. Thereby, even if there is a blind spot such as a recess on the surface of the mold body where the hot air hits, the hot air can be reliably supplied to the blind spot. Therefore, the entire mold body can be uniformly heated at a uniform temperature increase rate, and the entire powder slush raw material can be melted at a substantially uniform rate. Therefore, there is no need to wait for the temperature of the blind spot to rise to a predetermined temperature, and it is possible to save energy to a greater extent than in the past. Furthermore, if the angle of the fins is adjustable, one frame can accommodate multiple types of mold bodies, which is efficient.

[Example] This will be explained in detail below using Examples.

(First Embodiment) FIG. 1 is a cross-sectional view of a slush molding die according to a first embodiment of the present invention.

This slush mold consists of a plurality of rod-shaped bodies, each of which has a frame 1 forming one side of a rectangular parallelepiped, a mold body 2 held on the lower end surface of the frame 1, and a mold body 2 held at the lower end of the frame 1. It is comprised of fins 3 that are held adjustable.

The mold body 2 has a mold surface 21 facing outward from the frame body 1, and a back surface 2 facing outward from the frame body 1.
2 is provided facing inward of the frame body 1. The structure is such that hot air is blown onto the back side of the mold body 2.

Further, the fins 3 are pivotally attached to the frame 1, and the angle thereof is adjusted so that the hot air hitting the fins 3 is sent to the recess 23 on the back surface 22 of the mold body 2.

The slush mold of the first embodiment configured as described above can send hot air to the recess 23 which is a blind spot in the hot air passage through the fins 3, and the mold body 2 can be heated at a substantially uniform rate throughout. heated.
Therefore, waste of energy required for heating is eliminated,
It's efficient.

(Second Embodiment) FIG. 2 shows a sectional view of a slush molding die according to a second embodiment of the present invention.

This slush mold is composed of a plurality of rod-shaped bodies, each of which has a frame 5 forming one side of a rectangular parallelepiped, a mold body 6 held on the lower end surface of the frame 5, and a mold body 6 held on the lower end surface of the frame 5. It is composed of a plurality of fins 7 each held at the upper end so as to be able to freely adjust the angle.

The mold body 6 is provided with a mold surface facing outside the frame 5 and a back surface facing inside the frame 5, and is configured such that hot air is blown onto the back surface side of the mold body 6. The mold body 6 has an uneven portion 61 having a large surface area and a flat portion 62 having a smaller surface area than the uneven portion 61.

Further, the fins 7 are pivotally attached to the upper side of the frame 5 so as to be able to freely adjust the angle, and the angle is adjusted so that a large amount of the hot air hitting the fins 7 is sent to the uneven portions 61 of the mold body 6.

In the slush mold of the second embodiment configured as described above, the fins 7 can send more hot air to the uneven portions 61 with a large surface area of the mold body 6, and less hot air to the flat portions 62 with a small surface area. The entire mold body 6 is heated at a substantially uniform temperature increase rate.
Therefore, waste of energy required for heating is eliminated,
It's efficient.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a slush molding die according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a slush mold according to a second embodiment of the present invention. FIG. 3 is a perspective view showing a conventional slush mold. 1, 5, 8... frame body, 2, 6, 9... mold body,
3,7...Fin.

Claims (1)

[Claims] 1. A mold body having a mold surface processed into a predetermined shape, a frame provided around the body and holding the mold body, and fins held by the frame. A slush molding mold, characterized in that the fins control the flow direction of hot air blown onto the mold body from outside the frame. 2. The slush molding die according to claim 1, wherein the fins are held on the frame body so as to be adjustable in angle.