JPS6024579Y2 - Molding mold for foamed plastic - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a mold for molding foamed plastics, more specifically, a molding mold for molding expanded polystyrene beads into the shape of a desired molding piece.
, Foaming with a completely new structure that allows the middle mold to be freely changed according to the shape of the molding piece while fixed to the molding machine, and can be attached and detached in a short time, making it possible to dramatically change the middle mold. We provide molds for plastics.

Another object of the present invention is to provide a molding die in which the center alignment of the ejector pin and material filler is always constant after replacing the medium die, and no separate drilling operation is required.

As shown in FIG. 2, the conventional mold for foamed plastic of this type consists of a middle mold 22 detachably attached to a frame 2 and a back plate 23 attached to the frame 2 in correspondence with the middle mold 22. When replacing the middle die 22 in the structure, it is possible to remove only the middle die 22, but when the next middle die 22 is installed, holes 8 and 10 for inserting the ejector pin 7 and the material filler 9 are drilled in the back plate 23. holes 8', 10
′, and it is very difficult to eliminate this center deviation, making it impossible to use it in this state.

Therefore, when replacing the conventional medium mold 22, the back plate 22 had to be replaced as well, and when the back plate 23 was replaced, the frame 2 had to be removed from the molding machine.

In this way, with conventional molds of this type, it is necessary to remove the entire frame each time the middle mold is replaced depending on the shape of the molding piece to be molded, which is extremely complicated and does not improve production efficiency. This was a fatal flaw.

The present invention solves all of these conventional drawbacks, and its structural features are that the medium size is detachably attached to the frame, a back plate is separately provided behind the medium size, and the back plate and the medium size are extruded. In a mold for foamed plastic in which pins and holes for densely packed insertion are bored through each other without center deviation, both the medium mold and the back plate are connected via a support rod to form the medium mold. and a back plate are configured so that they can be attached to and detached from the frame while being integrally fixed.

The specific configuration thereof will be explained below according to an embodiment shown in the drawings.

1.1' engages the flanges 5, 5' with the respective steps 4 of the frame 2 and the central frame 3, and tightens the tightening bolts 6.6.
It is a medium-sized model that is removably attached at the push-out pin 7.
An insertion hole 8 and a hole 10 for insertion of the filling device 9 are formed.

11° 11' corresponds to the medium molds 1, 1', and a hole 8' for inserting the ejector pin 7 and a hole 10' for inserting the filling device 9 are centered on the respective holes 8, 10 of the medium molds 1, 1'. One end of the back plate 12 is fixed to the medium-sized 1°1 with an embedding bolt 13, and the other end is fixed to the back plate 11 with a tightening bolt 14.
．． The medium size and back plate are integrated into a unit with support rods fixed to 11.

16 is a stopper piece whose one end is fixed to the frame 2 with a tightening bolt 15 and the other end is tightly engaged with the back plate 11.11, and a comb backing for sealing between it and the back plate 11.11. A recess 18 is formed in which the recess 17 is inserted.

19 is a tightening bolt 20 attached to the rear end piece 3' of the central frame 3.
The stopper pieces are fixed to the stopper pieces and are engaged with the other end pieces of the back plate 11 and 11, respectively.

Reference numeral 21 indicates a spring fitted onto the push-out pin 7.

Since the present invention has the above-mentioned configuration, in order to mold the next irregularly shaped object in the state shown in Fig. 1, the middle mold must be replaced, but in that case, the middle mold 1.1' must first be replaced with the frame 2 and the center. Each tightening bolt 6 fixed to the frame 3 of
．． By loosening 6' and taking out the middle molds 1 and 1' in the direction of the arrow, the middle mold 1 can be easily removed as shown by the two-dot chain line in Figure 1.
゜1' can be removed from frames 2, 3, and medium-sized 1, 1' can be removed from frames 2, 3,
Furthermore, by removing the middle molds 1, 1', the back plate 11, 11' is also removed via the support rod 12.

Therefore, when replacing the medium mold, the medium molds 1, 1' can be reliably removed in a short time while the frame 2 is fixed to the molding machine, and can be replaced with the next medium mold.

Moreover, the next medium mold has support rod 12 like the medium molds 1 and 1'.
Since it is integrated with the back plate 11.11' through the frame, it can be easily installed with the tightening bolt 6.6' removed earlier.

Moreover, this unitized medium size 1゜1' and back plate 11
．． Since the holes 8.8', 10, and 10' are drilled in advance in the hole 11' without any center deviation, there is no need to drill holes later.

In this embodiment, the medium size is separated into two on both sides via the central frame 3, and it is also possible to replace only one of the medium types. It is also possible to form it as

Further, the fixing means for the medium size, support rod, stopper piece, etc. are by no means limited to bolts, and may be any known means.

Further, a rubber backing 17 is interposed between the stopper piece and the back plate to provide a sealing effect, but this backing is not an essential requirement.

As described above, in this invention, the medium size is integrated with the back plate via the support rod, so the medium size can be replaced while the frame is fixed to the molding machine, which is different from the conventional medium size replacement. The work efficiency can be dramatically improved compared to the previous model, and this type of mold for polystyrene foam has achieved a revolutionary effect.

In particular, since the back plate is also removed at the same time as the middle size is removed, the removal work is much easier than the conventional process of removing the back plate separately from the middle size.

An even more important point is that the middle mold is integrated with the back plate, and the ejecting pins and holes for pushing the filling mold are pre-drilled at the same time with their centers aligned on the middle mold and the back plate. There is no need for drilling work and there is no fear of the holes being misaligned, and the misalignment of the holes between the middle die and the back plate, which was a fatal drawback when replacing the conventional middle die, has been completely eliminated.

Moreover, the mold has excellent practical effects such as a simple structure, a small number of parts, and low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a mold according to the present invention. Figure 2 is a cross-sectional view of a conventional mold. 1.1...Medium size, 2...Frame, 3
... Frame, 7... Push-out pin,
8. Death...hole, 9...filler, 10,1
0'...hole, 11.11'...rear plate, 12...support rod.

Claims (1)

[Scope of utility model registration request] Foaming made by detachably attaching a medium mold to a frame, separately providing a back plate behind the medium mold, and drilling holes for ejecting pins and densely packed insertion through the back plate and the medium mold, respectively, without shifting the centers. In the hollow mold for plastics, both the medium mold and the back plate are connected via a support rod, and both the medium mold and the back plate are integrally fixed and can be freely attached to and detached from the frame. A mold for forming plastic foam, which is characterized by being configured as much as possible.