JPS6117652B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a mold release mechanism in a transfer foam molding apparatus, and is capable of easily and smoothly releasing a foam molded product from a mold for transfer foam molding. In order to increase the molding cycle and save energy in foam molding, we have developed a mold that mainly performs filling of raw materials and heating with steam, and a mold that receives the foam molded product after heat molding and actively cools it with water, etc. Transfer foam molding equipment, which transfers the heat molding stage and the cooling action stage to separate molds, such as by placing molds next to each other, actively processes foam molded products that have not yet been sufficiently cooled after heat molding. It becomes necessary to release the mold from the mold in order to proceed to the cooling action stage. If a conventional eject pin is used at the time of mold release, the foamed molded product will have a localized pressing effect on the foamed molded product that has not been sufficiently cooled, and the foamed molded product is likely to be damaged or deformed. Deep pin press marks were left, which was not desirable in terms of mold release and the appearance of the molded product, and improvements were desired. Therefore, in the present invention, it is possible to provide a mold release mechanism that can eliminate the above-mentioned conventional drawbacks, and its structure is to fill the mold cavity with foamable thermoplastic resin particles as a raw material, and then release the particles. A set of heating molds that can be opened and closed vertically to perform foam molding by heating, and a set of cooling molds that can be opened and closed vertically, one of the heating molds and one of the cooling molds can be moved laterally, respectively. A part of the above-mentioned one heat molding mold is divided into plate shapes as an eject plate, and a back plate is connected to the plate-shaped part via a first spring. Further, a second spring is disposed between the other surface of the back plate and the machine base, and the two springs are compressed by the first spring being compressed as one of the hot molding molds rises, and the eject plate is compressed. protrudes toward the mold cavity, and after the eject plate is released from the heating mold, the second spring is compressed as the mold rises, and the eject plate separates from the molded product. It is characterized in that the elasticity of the spring is set to be weaker than the elasticity of the second spring. Next, embodiments of the present invention will be illustrated below with reference to the drawings together with a transfer foam molding apparatus. 10 is a machine base, 11 is a sliding base plate part, 20 and 30 are a set of molds that can be opened and closed vertically and mainly serve as the heating side, and 40 and 50 are a set of cooling molds that can be opened and closed vertically. 20 and 30 are arranged adjacent to each other in the lateral direction, and the foamed molded product a delivered from the molds 20 and 30 is cooled. 21 is a member that fixes the upper mold 20 of the molds 20 and 30, 31 is a member that fixes the lower mold 30, and the above member 21 is installed on the upper part of the machine base 10. It is connected to the rod 23 of one cylinder mechanism 22 so that it can move up and down, and the other member 3
1 is connected to a rod 33 of a cylinder mechanism 32 installed on the side of the machine base 10, and the sliding base plate portion 11
The upper part can be moved laterally, and as described later, it can be moved to a position below the cooling mold 40. 60 is a filling feeder that fills and supplies expandable thermoplastic resin particles as a raw material into the cavity between the molds 20 and 30, and 70 is a supply hopper connected to the filling feeder 60. Next, reference numeral 80 denotes a mold release mechanism of the present invention for releasing the foam molded product a, and the mold release mechanism 80
A part of the mold 20, that is, a part of the upper mold 20 which becomes a cavity mold in the illustrated embodiment, is divided into plate shapes, and this plate-shaped part is used as an eject plate 81 to serve as a plurality of eject drive members. It is connected to the pin 82 of. 83 is pin 8
A support rod 84 is connected to the back plate 83, and the support rod 84 is inserted into the upper part of the machine base 10 so that it cannot be removed.
A spring 85 is interposed between the back plate 83 and the upper part of the machine base 10, and the spring 85 has a larger elastic force than the spring 85 described above.
A spring 86 is interposed which is compressed after the is compressed. 41 is the upper cooling mold 4 among the cooling molds 40 and 50.
The member fixing 0, 51 is the lower mold 50
The member 41 is connected to a rod 43 of a cylinder mechanism 42 installed at the top of the machine base 10 so that it can move up and down.
The other member 51 is connected to a rod 53 of a cylinder mechanism 52 installed on the side of the machine base 10 so that it can move laterally on the sliding base plate 11.
This means that it can be moved to a position below the molded product take-out mechanism, which will be described later. 90 is a mechanism for taking out the molded product, and a cooling mold 4
0 and 50 are adjacent to each other in the horizontal direction, and are connected to a rod 93 of a cylinder mechanism 92 installed at the top of the machine base 10 so as to be able to move up and down. The take-out mechanism 90 is of a vacuum suction type and is equipped with a suction cup 91 at its tip so that the suctioned foam molded product can be moved to a stack position 94 below the machine stand. In addition, regarding the above-described one set of molds 20, 30 and one set of cooling molds 40, 50, the lower mold 30 and cooling mold 50 are formed as a core mold, and the upper mold 20 and cooling mold are formed as a core mold. 40 is preferably formed into a cavity mold. In the above-described device example, the steam supply pipe, cooling water supply pipe, air supply pipe, and discharge pipe thereof are omitted from illustration. To explain the foam molding action of the foam molding apparatus using the mold release mechanism according to the present invention, the following [1] to

This is done through the process of [9]. (1) The mold cavities of the clamped molds 20 and 30 are filled with foamable thermoplastic resin particles as a raw material,
On the other hand, in the cooling molds 40 and 50 that have been clamped, a process (first
(See Figure 2), (2) The molds 20 and 30 are heated using steam, and the cooling molds 40 and 50 are drained of the water used for cooling (see Figure 2); (3) The mold 20 , 30 perform double-sided heating using steam, and the cooling molds 40 and 50 are opened to leave the foamed molded product a in the lower cooling mold 50 (see Figure 3), (4) The molds 20 and 30 are naturally cooled, and the cooling mold 4
0 and 50, the process of moving only the lower cooling mold 50 below the molded product removal mechanism 90 by timing operation of the cylinder mechanism 52 (see Fig. 4); (5) opening the molds 20 and 30; Foam molded product a
is left in the lower mold 30 by the action of the eject plate 81 of the mold release mechanism 80, and the molded product ejecting mechanism 90 is attached to the lower cooling mold 50 that is being moved.
(6) Among the molds 20 and 30, the lower mold 30 in which the foamed product a remains is placed in the cooling molds 40 and 5.
0 to the lower part of the upper cooling mold 40 by the timing operation of the cylinder mechanism 32, and from the lower cooling mold 50, the foamed molded product a
(7) A process of lowering the upper cooling mold 40 to the lower mold 30 with the foamed molded product a and clamping it. (See Fig. 7), (8) The process of opening the lower mold 30 and the upper cooling mold 40 and transferring the foamed molded product a to the upper cooling mold 40 (see Fig. 8); (9) The lower mold 30 and the lower cooling mold 50 that had been moved are returned to their original positions by the timing operation of the cylinder mechanism 32 and the cylinder mechanism 52, respectively, and the molds 20, 30 and the cooling mold 40, 50 are prepared so that they can be clamped, and the foamed molded product a on the side of the molded product removal mechanism 90 is moved to the stack position 94 and taken out (see FIG. 9). During the foam molding process exemplified above, the mold release mechanism 80 according to the present invention is operated during the transition from process 4 to process 5, and its details are shown in FIGS. 10 to 13. When the upper mold 20 of the molds 20 and 30 starts to rise, the spring 85 between the mold 20 and the back plate 83 is compressed, and the eject plate 8
1 starts protruding toward the mold cavity of the mold 20 together with the pin 82 of the eject drive member, and starts releasing the foamed molded product a from the mold 20 (Figs. 10 to 11).
(see figure). Further, as the mold 20 rises, the eject plate 81 completely separates from the mold 20 and pushes the foamed molded product a to the lower mold 30 (the 11th
12), the compression of the spring 82 shifts to the compression of the spring 86 between the back plate 83 and the upper part of the machine base 10, and the mold 20 rises further, so that the eject plate 81 is foam-molded. When the mold 20 moves away from the product a and the mold 20 rises completely, the eject plate 81 completely separates from the foam molded product a.
The foam molded product a remains in the lower mold 30 (see FIGS. 12 and 13). In this way, the foam molded product a is released from the mold by the mold release mechanism 80, but the foam molded product a is removed from the molds 20 and 30.
In particular, in this invention, as the mold release mechanism 80, a part of the mold 20 is formed into a plate shape, since the mold is molded under heat and is released in a state where it has not yet been sufficiently cooled and is moved to the cooling mold side. The eject plate 81 is formed by dividing it into parts, and a spring 85 and a spring 86 are arranged between the plate-like part and the back plate, and between the back plate and the machine stand, respectively.
As the mold 20 rises, the spring 85 is first compressed and the eject plate protrudes toward the mold cavity.After the eject plate is completely released from the mold, the spring 86 is compressed as the mold further rises. The elasticity of the spring 85 is set to be weaker than the elasticity of the spring 86 so that the eject plate separates from the molded product. Even in the above-mentioned uncooled state, the mold can be released smoothly and effortlessly without being locally bitten like with conventional eject pins, and the molded product can be removed from the mold while remaining in the mold 30. This allows for smooth transportation to the cooling process, which is the next process. Therefore, it is possible to provide an optimal product as a mold release mechanism for use in transfer foam molding, which aims to utilize energy effectively and increase molding cycle.

[Brief explanation of the drawing]

1 to 9 are partial sectional views showing the process of transfer foam molding, and FIGS. 10 to 13 are enlarged sectional views showing the mold release process by the mold release mechanism according to the present invention. 20, 30... Molding die, 80... Mold release mechanism, 8
1... Eject plate, 82... Pin, 83
... Back plate, 84 ... Support rod, 85, 86 ...
spring.

Claims (1)

[Claims] 1 A set of heating molds that can be opened and closed vertically and a set of cooling molds that can be opened and closed vertically are used to fill the mold cavities with foamable thermoplastic resin particles as a raw material and heat them to form foam molds. One of the heating molding molds and one of the cooling molding molds are respectively provided inside the machine so as to be movable in the lateral direction, and a part of the one heating molding mold is divided into plate shapes as an eject plate. A back plate is connected to the plate-shaped portion via a first spring, and a second spring is disposed between the other surface of the back plate and the machine base, and the two springs are As one of the heating molds rises, the first spring is first compressed and the eject plate protrudes toward the mold cavity.After the eject plate is released from the heating mold, as the mold rises, the eject plate is released from the mold. In a transfer foam molding apparatus, the elasticity of the first spring is set to be weaker than the elasticity of the second spring so that the second spring is compressed and the eject plate separates from the molded product. Type mechanism.