JPH0344399Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a vertical press device that clamps a mold based on the clamping operation of a movable platen to an upper holder. The present invention relates to a technique for suppressing or preventing deformation of an upper mold.

(Prior Art) Conventionally, as one of the vertical press devices, a movable platen is moved upwardly, and a lower die attached to the movable platen is pressed against an upper die attached to an upper holder. The following format is known.

By the way, in this type of vertical press device, the upper die is usually attached to the upper holder via at least one metal plate such as a heating plate or a mounting plate. Because the thickness of the metal plate interposed between the mold and the upper holder is thin, the upper holder applies a large clamping force when pressing the lower mold to the upper mold, regardless of the presence or absence of such a metal plate. The problem is that, unless the thickness of the upper holder is made significantly thicker, the upper holder will be unavoidably deformed into a concave shape when compressed. It was hot.

(Problem to be solved by the invention) Therefore, in the conventional vertical press device, the lower surface of the upper holder is provided as a flat surface with extremely high flatness, and the lower surface of the upper holder is provided as a flat surface with extremely high flatness. All of the metal plates that can be
Since it was a flat plate with a constant thickness with extremely high flatness, when the upper holder is deformed into a curve, the upper mold is deformed into a curve due to the curved deformation of the upper holder, and as a result, the upper mold There was a problem in that the molded product formed between the upper mold and the lower mold was distorted due to the curved deformation of the upper mold. In order to avoid such problems, as mentioned above, the upper holder must be made thicker to prevent the upper holder itself from being bent or deformed, or the mold must be made thicker to prevent the upper holder from bending. The problem was that it was necessary to prevent the deformation from affecting the mold.

The present invention was developed against this background, and the problem to be solved is to reduce the curvature of the upper die during pressing without increasing the thickness of the upper holder and the upper die. The goal is to establish technology that suppresses or prevents deformation.

(Solution Means) In order to solve this problem, in the present invention, based on the lifting operation of the movable plate as described above, the lower mold attached to the movable plate is attached to the upper mold attached to the upper holder. In a vertical press device, the upper die is attached to the upper holder via at least one metal plate, and at least one of the metal plates has a bulge shape with a thicker plate thickness toward the center. At the same time, the shape of the entire metal plate interposed between the upper mold and the upper holder is determined when the center part of the upper surface of the upper mold contacts the lower surface of the upper holder without any gap through the metal plate when the mold is clamped. , a gap is formed at the peripheral edge from the bottom surface of the upper holder to the top surface of the upper mold, and the gap gradually increases from the center of the upper mold to the peripheral edge.

[Effect]

In the vertical press device of the present invention, by adjusting the shape of the metal plate interposed between the upper mold and the upper holder, when the mold is clamped, the center part of the upper surface of the upper mold passes through the metal plate to the lower surface of the upper holder with just a gap. When they come into contact without contact, a gap is formed between the lower surface of the upper holder and the upper surface of the upper mold at the peripheral edge of the contact part, which increases toward the peripheral edge of the upper mold. At the beginning of the holder's curved deformation, this gap only decreases and the curved deformation does not affect the upper mold.
Only when this gap disappears will the deformation of the upper holder be transmitted to the upper mold.

As described above, according to the vertical press device of the present invention,
The curved deformation of the upper holder is absorbed by the disappearing effect of the gap formed between the bottom surface of the upper holder and the top surface of the upper mold, and until the gap disappears, the curved deformation of the upper holder is transferred to the upper mold. It can be prevented from causing deformation. Therefore, the deformation of the upper mold due to the curved deformation of the upper holder and the distortion of the molded product formed between the upper mold and the lower mold can be suppressed accordingly.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, FIG. 1 shows an example of a vertical press device used as a mold clamping device of an injection molding machine according to the present invention. There, 10 is a lower surface plate, and tie rods 12 are erected at its four corners. An upper holder 14 is disposed at the upper end of the tie rod 12 with its four corners connected and held. Further, in the figure, reference numeral 16 denotes a movable plate, which is disposed between the upper holder 14 and the lower surface plate 10 in a state where it is guided up and down by tie rods 12, and which is placed between the upper holder 14 and the lower surface plate 10. It can be raised and lowered by a tightening cylinder 18.

A mounting plate 20, which is a metal plate, is arranged on the lower surface of the upper holder 14, and a heat plate 22, which is also a metal plate, is arranged on the lower surface of the mounting plate 20, with a heat insulating plate 24 interposed therebetween. An upper mold 26 is disposed at the center of the lower surface of the hot plate 22.

On the other hand, a hot plate 30 is disposed on the upper surface of the movable platen 16 via a heat insulating plate 28, and a lower mold is placed at the center of the upper surface of the hot plate 30 so as to face the upper mold 26. 32 are arranged. Then, based on the lifting operation of the movable platen 16 due to the protruding operation of the ram 34 of the clamping cylinder 18, the lower mold 32 mounted on the movable platen 16 is pressed against the upper mold 26 mounted on the upper holder 14. It is becoming more and more like this.

Here, the upper holder 14 has a lower surface that is connected to the second
As shown in the figure, it is a flat surface with extremely high flatness. Further, the thickness of the upper holder 14 is not particularly thick, and when a clamping force is applied, the central portion thereof curves and deforms so as to protrude upward. Therefore, when the upper mold 26 and the lower mold 32 are pressed together, the lower surface of the upper mold holder 14 is curved into a concave surface with its center portion recessed upward, as shown in FIG. In addition, this upper holder 14
The curvature depth a (see Figure 3) of the lower surface of the holder varies depending on the thickness of the upper holder 14 and the magnitude of the clamping force (mold clamping force), but is usually 1/100 to 5/ It is about 100mm, more commonly about 2/100 to 3/100mm.

On the other hand, the lower surface of the mounting plate 20 attached to the lower surface of the upper holder 14 is a flat surface similar to the lower surface of the upper holder 14, but the upper surface of the mounting plate 20 is attached to the lower surface of the upper holder 14 during pressure tightening.
4 has a convex surface corresponding to the concave surface formed on the lower surface of the upper mold 26, and when the upper mold 26 and the lower mold 32 are not pressed together, the central part of the upper surface is formed as shown in FIG. It is designed so that it can be brought into contact with the lower surface of the upper holder 14 by just touching it. When the upper mold 26 and the lower mold 32 are not pressed together, the mounting plate 20 is placed between the upper surface of the mounting plate 20 and the lower surface of the upper holder 14 around the contact portion.
A gap b is formed which is approximately the same size as the curvature depth a of the lower surface of the upper holder 14 at the time of clamping, which increases toward the peripheral edge of the upper holder 14 . between the upper surface of the mounting plate 20 and the lower surface of the upper holder 14.
A gap having a size of about 1/100 to 5/100 mm, more generally a gap of about 2/100 to 3/100 mm, is formed at the peripheral end.

Note that the heat plate 22 as another metal plate between the upper holder 14 and the upper mold 26 and the heat insulating plate 24 disposed between the mounting plate 20 and the heat plate 22 are different from those of the conventional device. Similarly, the heating plate 22 is a flat plate having a constant thickness and having flat surfaces parallel to each other on both sides.
The mounting surface (upper surface) of the upper mold 26 attached to the lower surface of the mold 26 is also provided as a highly flat surface. Further, the lower surface of the lower die 32 and the upper surface of the movable platen 16 are both flat surfaces with high flatness, similar to the conventional device, and a hot plate interposed between the movable platen 16 and the lower die 32 The heat insulating plate 30 and the heat insulating plate 28 are also flat plates having a constant thickness and having both surfaces parallel to each other, as in the conventional device.

In such a press device, when the movable platen 16 is moved upward to press the lower die 32 against the upper die 26, the clamping force is applied to the center of the upper holder 14 via the upper die 26. As a result, as mentioned above, the depth of the central part of the concave surface formed on the lower surface is a
The upper holder 14 is curved so that. However, here, the top surface of the mounting plate 20 is
As mentioned above, since the protruding height of the central portion is formed as a convex surface with approximately the same dimension as the concave depth (curved depth) of the lower surface of the upper holder 14, the convex surface of the upper surface of the mounting plate 20 is The upper holder 1 fits exactly into the concave surface of the lower surface of the upper holder 14.
The concave surface of the lower surface of 4 and the convex surface of the upper surface of the mounting plate 20 cancel each other out, and as a result, the lower surface of the mounting plate 20 is attached to the lower surface of the mounting plate 20 via the heat insulating plate 24 and the heating plate 22. The upper surface of the upper mold 26 is held as a highly flat surface.
That is, in this example, the curved deformation of the upper holder 14 is
The gap formed between the lower surface of the upper holder 14 and the upper surface of the mounting plate 20 is absorbed by the disappearance of the gap.

As described above, according to the device of this embodiment, the upper holder 14 is allowed to be curved and deformed by the clamping force without increasing the thickness of the upper holder 14. By eliminating the gap formed between the lower surface of the upper holder 14 and the upper surface of the mounting plate 20, the upper surface of the upper mold 26 can be satisfactorily held as a highly flat surface. Therefore, while maintaining the thickness of the upper holder 14 relatively thin and without increasing the thickness of the upper mold 26, the upper mold 26 can be effectively suppressed or prevented from being curved and deformed. It is possible to effectively prevent distortion of the molded product due to the curved deformation of the molded product.

One embodiment of the present invention has been described in detail above, but
The present invention is not limited to this, and can be implemented with various changes and modifications without departing from the spirit thereof.

For example, in the above embodiment, the mounting plate 20 has a bulge shape, and a gap is formed between the upper surface of the mounting plate 20 and the lower surface of the upper holder 14 to absorb deformation of the upper holder 14. However, by adjusting the shapes of the mounting plate 20 and the heat plate 22, such gaps can be created by adjusting the shapes of the mounting plate 20 and the heat plate 22, such as between the bottom surface of the mounting plate 20 and the top surface of the heat insulating plate 28, and between the top surface of the heat plate 22 and the bottom surface of the heat insulating plate 28. It is also possible to form it between the lower surface of the hot plate 22 and the upper surface of the upper mold 26,
Furthermore, it is also possible to form them at multiple locations. In short, such a gap only needs to be formed between the upper surface of the upper mold 26 and the lower surface of the upper holder 14. Above type 2
When forming such gaps at multiple locations between the upper surface of 6 and the lower surface of upper holder 14,
The total amount of those gaps may be made to correspond to the amount of deformation of the upper holder 14.

In addition, in the above embodiment, the mounting plate 20 and the hot plate 22
Although we have described the case where the present invention is applied to a press device having two metal plates, it is also possible to apply the present invention to a press device equipped with only one metal plate, and it is also possible to apply the present invention to a press device having only one metal plate. It is also possible to apply the present invention not only to the press device but also to a side plate type press device.

(Effects of the invention) As is clear from the above explanation, according to the vertical press device according to the invention, at least one of the metal plates interposed between the upper holder and the upper mold has a bulge shape, and the upper With a simple structure that only forms a predetermined gap between the top surface of the mold and the bottom surface of the upper holder, the curved deformation of the upper mold during pressing can be prevented without increasing the thickness of the upper holder and the upper mold. There is an advantage in that it is possible to satisfactorily suppress or prevent harmful effects such as molding defects caused by curved deformation of the upper mold during press-clamping.

[Brief explanation of drawings]

FIG. 1 is a front view showing a vertical press device according to the present invention, FIG. 2 is an enlarged explanatory view of the main part of FIG. 1, and FIG. FIG. 3 is a view relative to FIG. 2 in the operating state; 14... Upper holder, 16... Movable plate, 20
...Mounting plate (metal plate), 22...Hot plate (metal plate), 26...Upper mold, 32...Lower mold.

Claims (1)

[Scope of Claim for Utility Model Registration] A vertical press device that presses a lower mold mounted on a movable platen to an upper mold mounted on an upper holder based on the upward movement of the movable platen, The upper holder is attached to the upper mold through at least one metal plate, and at least one of the metal plates is provided with a bulge shape that is thicker toward the center, and a space between the upper mold and the upper holder is provided. The overall shape of the intervening metal plate is defined as the shape from the bottom surface of the upper holder to the top surface of the upper mold at the periphery when the center part of the top surface of the upper mold contacts the bottom surface of the upper holder without any gap through the metal plate during mold clamping. 1. A vertical press device characterized by having a shape in which a gap is formed between the upper molds and the gap gradually increases from the center of the upper mold to the peripheral edge.