JPH0557807A - Frame structure for foam molding die - Google Patents

Abstract

PURPOSE:To simplify the manufacture of a foam molding die frame, shorten the delivery time of a product and reduce the manufacturing cost. CONSTITUTION:A corner section fixing material 1 provided with connection fitting sections 2 and 3 and its both ends and a light alloy profile material 4 of required length formed into the sectional shape correspondingly to the connection fitting sections 2 and 3 of the corner section fixing material 1 are combined by extrusion processing of light alloy such as aluminum, and the ends are fixed together and connected each other into the frame shape, and the frame of the foam molding die with its fitting and connection sections are clamp fixed by clamping materials 8 such as bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the frame structure of a foam molding die, and more particularly in a foam polystyrene molding die.

[0002]

2. Description of the Related Art A styrofoam molding die mounted on an automatic molding machine is generally composed of a fixed side (cavity type) and a moving side (core type) which are concave and convex. Each has a frame and has a cavity mold and a core mold attached to the opposite faces, and a back plate attached to the opposite face to form a steam chamber inside.

FIG. 5 shows an example conventionally known as a frame for a die as described above, which is formed as an integral body by casting an aluminum alloy, or a plurality of plate bodies (11),
(12) is formed by casting an aluminum alloy and joined by casting welding to form a rectangular frame.

[0004]

SUMMARY OF THE INVENTION However, an integrally formed product made by casting an aluminum alloy as described above or a frame in which a plurality of plate members are joined by casting welding has a complicated casting process and is expensive to manufacture. It had the drawback of requiring a long construction period. Further, when changing the shape of the molded product or the number of steps per mold when changing the production of the molded product, it is necessary to prepare a frame suitable for each, which is extremely uneconomical. In addition, casting defects and strength deterioration due to casting deterioration during welding are likely to occur, and there is a problem in long-term usability.

In view of the above-mentioned circumstances, the present invention finds use of a profile material by fitting and assembling a mold frame and extruding a light alloy such as aluminum in order to cope with the situation, and thus, to form a mold frame. It is intended to reduce the production time and the production cost in the foam-molded product manufacturing industry by simplifying the molding process and significantly reducing the mold frame manufacturing cost and shortening the manufacturing period. Another object of the present invention is to easily cope with the change of the size of the molded product or the number of molds taken per die by replacing the profile material with a desired length prepared in advance.

[0006]

That is, the features of the present invention that meet the above-mentioned object are that a corner fixing material having connecting fitting portions at both ends and the corner portion by extruding a light alloy such as aluminum. A light alloy profile material of the required length formed in the cross-sectional shape corresponding to the connecting part of the fixing material is combined, the ends are fitted and connected to form a frame shape, and the fitting connection part is bolted. It is configured to be fastened and fixed by such fastening materials. The invention according to claim 2 is characterized in that, in the mold frame, the core portion of the profile material formed by extrusion molding is hollow to improve economy.

[0007]

According to the mold frame structure of the present invention described above, if a profile material having a cross-sectional shape that matches the shape of the fitting portion for connection of the corner fixing material is prepared by the drawing process of a light alloy such as aluminum. The mold frame can be easily made by simply fitting and connecting the corner fixing member as a required length and assembling, and fixing the fitting connecting portion by bolt fastening or the like.

When the size of the molded product or the number of molds to be taken per one mold is changed, the assembly can be carried out by simply changing the length of the light alloy profile material so as to be compatible with this, and it is possible to easily cope with it. If the core of the profile material is hollow, not only the material surface is saved, but also the handleability during work is improved.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an outline of a corner fixing member (1) and a profile member (4) fitted and assembled to the corner fixing member (1) which are constituent elements of a mold frame according to the present invention. (1) is a shape that fits the corners of the mold frame,
In the drawing, an L-shaped shape curved in an arc is formed, and connecting ends (2), (3) for connecting and connecting a profile member (4) to both ends thereof as shown in FIGS. 2 and 3. Are formed respectively. The corner fixing material (1) is not limited to a light alloy as a material, and is made of an appropriate material and molded by casting or other means.

On the other hand, (4) is a connecting member which is engaged with the corner fixing member (1) and forms a side portion of the mold frame, and the corner fixing member ((a) is formed by extruding a light alloy such as aluminum. It is a profile material having a cross-sectional shape that can be fitted into the connecting fitting portion of 1).

Since this profile material (4) is made by extruding a light alloy such as aluminum, it is formed as a long product having the same cross-sectional shape in the length direction, and therefore, it is formed in accordance with the required length of the mold frame. Used for cutting. In this case, if the cross-sectional shape of the profile member (4) corresponds to the cross-sectional shape of the connecting fitting portions (2) and (3) of the corner fixing member (1) and the cross-sectional shapes that can be fitted to each other are shown, It is not limited to the shape.

The profile material (4) may be a solid material, but it is preferable to provide a hollow portion (5) in the core portion as shown in the figure from the viewpoint of weight saving. Then, the corner fixing material (1) described above and the light alloy profile material (4)
For example, in the case of a rectangular mold frame, the corner fixing members (1) are arranged at the four corners respectively, and the corner fixing members (1) are separated from each other by using a light alloy profile material. The parts are fitted together and joined together to form a rectangular frame.
At the time of assembly, in order to strengthen the fitting connection between the corner fixing material (1) and the light alloy profile material (4), as shown in FIG. 1, bolt holes () are formed on the respective members (1) and (4). 6),
(7). Is provided, and the holt (8) is inserted and fixed from the horizontal direction or the horizontal direction of the fitting surface.

By the way, the mold is composed of one set of the cavity mold on the fixed side and the core mold on the moving side as described above. The mold frame on the cavity mold side and the mold frame on the core mold side are not necessarily the same, and the mold types are different according to each. Therefore, there are two types of mold frames, one for the cavity mold side and the other for the core mold side, and the shapes are slightly different. Accordingly, the corner fixing material (1) and the profile material according to the present invention are accompanied. Also in (4), the cross-sectional shape corresponding to the fitting portion of each other is adopted.

2 and 3 show the corner fixing member (1), FIG. 2 shows the corner fixing member used in the fixed cavity mold, and FIG. 3 shows the corner fixing member used in the movable core side. It is a material. Further, FIG. 4 shows each modified cross section of the profile material (4), (A) is a profile material used for a fixed side cavity type frame structure, and (B) is used for a moving side core type frame structure. It is a profile material.

The frame structure of the present invention is as described above, and a cavity mold and a core mold are attached to each of the obtained frames on the front side, while a back plate is attached to the back side to form a steam chamber inside. Then, the pre-expanded particles such as polystyrene are filled in the cavity through the raw material filling machine, steam is introduced into the steam chamber for heat foam molding, the drain is discharged, and then cooling water is introduced into the steam chamber and gold is introduced. A molding operation is performed by cooling the mold and then opening the mold and releasing the foamed molded product. At this time, the position and the number of the raw material filling machine and the eject pin for releasing the mold change depending on the molded product.

Conventionally, in such a case, another frame prepared in advance has been replaced at this time, which makes maintenance of the replacement frame difficult. However, in the present invention, the profile material (4) previously formed by extrusion is used. ) Is used to cut each to a required length, combine with the corner fixing material (1), and are fitted and joined together, which is suitable for improving work efficiency in foam molding. Also, since the manufacturing cost can be reduced, it is possible to prepare multiple spare frames and set the medium size in advance to reduce or shorten the replacement work.

[0017]

As described above, according to the present invention, the corner fixing material having the fitting portions for connecting the mold frame at both ends as described above and the fitting fitting for connecting the corner fixing material by the drawing process of the light alloy such as aluminum. It is formed by combining a light alloy profile material of a required length formed in a cross-sectional shape corresponding to the joint and fitting and joining the ends to each other. Compared with the one that welds and joins the alloy cast forming plate, if you cut the profile material to the mold frame and cut it to an arbitrary size, you can create the mold frame just by combining it with the corner fixing material. It is very easy and easy to create a mold frame, and it is possible to quickly respond to specification changes such as changing the size of the molded product or the number of molds taken per mold, which is economical as well as work efficiency. And it has a valid effect. In particular, the frame structure according to the present invention does not require a welding process and can be easily manufactured by only an assembling work, so that it has an advantage that it can be manufactured at low cost, has high dimensional accuracy, and strengthens a joint portion with a bolt or the like. With this, a sufficient strength can be obtained, and the frame structure is extremely practical as a frame of a foam molding die. By making the core material of the profile material hollow, it is possible to reduce the weight and save the material to improve the practicality.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of constituent elements of a frame according to the present invention.

2A and 2B are views showing a joint portion of a corner side fixing material on a fixed side, FIG. 2A is a plan view, and FIG. 2B is a right side view.

3A and 3B are views showing a joint portion of a corner fixing member on a moving side, FIG. 3A is a plan view, and FIG. 3B is a right side view.

4A and 4B are cross-sectional views showing respective examples of profile materials, FIG. 4A is a cross-sectional view of each fixed profile material, and FIG. 4B is a cross-sectional view of each profile material on a moving side.

FIG. 5 is a plan view showing an example of a known mold frame.

[Explanation of symbols]

 (1) Corner fixing material (2) Connection fitting part (3) Connection fitting part (4) Profile material (5) Hollow part (6) Bolt hole (7) Bolt hole (8) Bolt

Claims (2)

[Claims] 1. A frame of a foam molding die to which a cavity shape or a core shape is attached, the corner fixing material having connecting fitting portions at both ends, and the corner by extruding a light alloy such as aluminum. Part of the fixing material is combined with a light alloy profile material of a required length formed in a cross-sectional shape corresponding to the connecting fitting portion, and the end portions are fitted and connected to each other to form a frame shape. A frame structure of a mold for foam molding, characterized by being fastened and fixed by a fastening material such as a bolt. 2. The frame structure for a foam molding die according to claim 1, wherein the core portion of the light alloy profile material is hollow.