JPH0116573Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Technical field This invention relates to a molding device, especially a molding device with an improved sealing structure, and is particularly suitable for surrounding a mold and performing molding by vacuum processing the inside. The present invention relates to a molding device.

(b) Prior art and problems Various types of seal structures for molding equipment have been developed in the past, and one of them is the "rubber molding and vulcanizing equipment" disclosed in Japanese Patent Publication No. 57-44458. A sealing structure shown in a molding apparatus such as ``A.'' is known. This "molding device 1" is provided with an upper mold 4 and a lower mold 5 facing each other to an upper base body 2 and a lower base body 3. Base body 2, 3
Furthermore, an upper frame 6 and a lower frame 7 are provided. This upper frame 6 serves as a cylinder, and the lower frame 7 is arranged on both the upper and lower base bodies 2 and 3 facing each other so as to serve as a piston.
A sealing material 10 is arranged on the sliding side surfaces 8 and 9 of the slider. During the molding process, the atmosphere around both the upper and lower molds 4 and 5 is reduced in advance to make it airtight, thereby preventing the formation of depressions due to air bubbles on the surface of the molded product 11.

However, in the sealing structure shown in this prior art, the heat-resistant packing as the "sealing material" 10 screwed to the open end 12 of the upper frame 6 has a mountain-shaped sealing part 13 protruding from the entire inner circumference. The mountain-shaped seal portion 13 is arranged so as to be slidably pressed against the outer periphery of the lower frame 7, that is, the slide side surface 9, and is always attached to the inner periphery of the heat-resistant packing 10, that is, the mountain-shaped seal portion 13. It is necessary to secure the seal part 13 with screws while accurately positioning it so that it is in close contact with the outer peripheral surface (slide side surface 9) of the lower frame 7. Large gap d due to assembly error between
If such occurrence occurs, it is difficult to absorb it, and furthermore, the heat-resistant packing 10 must be specially molded with a mountain-shaped sealing portion 13, which tends to increase the economic cost. It was warm.

(C) Purpose This invention was developed to improve the conventional technology as described above, and it utilizes an O-ring-shaped sealing material without using a special-shaped sealing material. -Easy to use and maintains a high degree of airtightness when decompressing the atmosphere around both the upper and lower molds by improving the freedom of attachment of the ring-shaped sealing material and the sealing performance against the side of the mating slide. The present invention aims to provide a molding device having a sealing structure.

(D) Structure In order to achieve the above object, the molding device according to this invention employs an O-ring-shaped sealing material, and this sealing material is placed opposite the lower surface of the upper frame or the upper surface of the lower frame, and It is held by the holding part of the housing placed on the upper base body via an elastic body,
The gist is that when both the upper and lower molds approach, the pressing force of the sealing material against the corresponding slide side is increased by the pressing force of the lower surface of the upper frame or the upper surface of the lower frame and the pressing force of the elastic body. .

(E) Embodiments The details of this invention will be explained below based on the drawings showing embodiments from FIG. 2 onwards.

FIGS. 2 and 3 show an embodiment of this invention.

There is an upper frame 21 as a cylinder provided on the upper base body 20 and a lower frame 23 as a piston provided on the lower base body 22. are arranged on the lower base body 22. This housing 26 has a shape that surrounds the outside of the lower frame 23, and has a holding portion recessed at the edge of the contact surface 27 against the lower surface 24 of the upper frame and the corresponding side surface 29 against the lower frame side surface, that is, the slide side surface 28. 30, the O-ring shaped sealing material 31 supported there is always attached to the lower frame 23.
It has a shape that applies an extrusion force toward the side surface, that is, the slide side surface 28. That is, as shown in FIG. 3, the holding portion 30 of the housing 26 has a receiving surface portion 32 that becomes narrower toward the back, and constantly pushes out the O-ring-shaped sealing material 31 supported therein in the direction of arrow A. It works like this.

The sealing material 31 having an O-ring shape has a cross-sectional size equal to the contact surface 27 of the housing 26.
and is sized so as to protrude upwardly and inwardly from the corresponding side surface 29, respectively, by an amount l. A "coil spring" is adopted as the elastic body 25, and a plurality of spring receiving portions 33 are recessed at appropriate positions in the longitudinal direction on the lower surface of the housing 26, which has an overall shape that surrounds the outside of the lower frame 23. An elastic body 25 is interposed between the spring receiving portion 34 formed on the corresponding lower base body 22.

Next, the effect will be explained.

When molding the molding material by matching the upper and lower molds (not shown), both the upper and lower base bodies 20 and 22 are moved in a direction toward each other in order to match the molds, and as a result, the housing 26 holding part 3
The O-ring-shaped sealing material 31 supported at 0 is subjected to the pressing force of the lower surface 24 of the upper frame from the direction of arrow B in FIG. As the pressing force is applied, the sealing material 31 is forced to deform from the state shown by the solid line to the state shown by the imaginary line, and the sealing material 31 is forced to deform from the state shown by the solid line to the state shown by the imaginary line, and accordingly, the sealing material 31 deforms in the direction of arrow A in FIG. This results in a larger protrusion (see FIG. 3), thereby increasing the pressing force against the slide side surface 28. In this way, when the upper and lower base bodies 20 and 22 are moved toward each other for the molding process, the O-ring-shaped sealing material 31 is forced to deform its cross-sectional shape, and the corresponding slide side surface 28 is forced to deform.
In order to increase the pressing force against the mold, the airtightness is greatly improved when the atmosphere around both the upper and lower molds is reduced in pressure.

In the description of the embodiment shown in FIGS. 2 and 3, only the necessary parts common to the conventional ones are shown, and other overlapping parts are omitted.

FIG. 4 is a diagram showing a second embodiment of this invention, in which the housing 26 is attached to the upper surface of the lower frame.
5 is disposed on the upper base body 20 via the elastic body 25, and the holding portion 3 of the housing 26
The O-ring-shaped sealing material 31 supported by the sliding side surface 3
6, which is arranged so as to apply a pressing force thereto. The other configurations and operations are the same as in the previous embodiment, so common parts are designated by the same reference numerals, and redundant explanation will be omitted.

FIGS. 5A and 5B are diagrams showing the third and fourth embodiments of this invention, respectively. The third embodiment shown in FIG. Although it has the same elements as in FIG. 4, the state in which the O-ring-shaped sealing material 31 is held in the housing 26 differs from the previous embodiment in that the outer surface of the upper frame 21 is a sliding side surface 37, and the upper frame 21 is slid. side 3
7 is arranged so as to apply a pressing force.

Furthermore, the fourth embodiment shown in FIG. 5B is different from the first embodiment shown in FIG. Although common to the example, O
- The ring-shaped sealing material 31 is arranged so as to apply a pressing force to the inner surface of the lower frame 23 by using it as a sliding side surface 38. The third and fourth embodiments shown in FIG. 5A and FIG.
Since it is substantially the same as the embodiment, common parts are indicated by the same reference numerals, and redundant explanations will be omitted.

(F) Effect Since the molding device according to this invention has the contents as explained above, it is possible to use a commonly known O-ring shaped sealing material without using a special shaped sealing material, and moreover, this In the holding part of the housing that holds the O-ring-shaped sealing material, a pressing force is applied to this sealing material so as to sandwich it in the approaching direction of both the upper and lower base bodies during molding, and the pressing force is applied to the sealing material. This is converted into a pressing force against the sliding side surface of the other side's upper or lower frame to be sealed, and this pressing force is increased. Even if there is a gap, the sealing material changes the cross-sectional shape and absorbs it, so even if there is a gap, the airtightness can be further improved when depressurizing the atmosphere around both the upper and lower molds. This makes it easier to adjust the positions of the upper frame and lower frame provided for both the upper and lower base bodies within the range that is absorbed by the deformation of the sealing material, and furthermore, the upper and lower base bodies can be moved in the direction closer to each other. During non-molding, the sealing material supported by the housing is not forced to deform in cross-sectional shape, which reduces fatigue due to changes in shape, and actually reduces the atmosphere around the upper and lower molds during the molding process. Only when it is necessary to reduce the pressure, the sealing material can be used in a way that increases its airtightness, so the service life of the sealing material can be extended, and the special shape of the sealing material as mentioned above is not used. This also has many effects that are economically advantageous.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional view of a molding device showing the seal structure of a conventional molding device, Fig. 2 is a cross-sectional view of a main part showing an embodiment of this invention, and Fig. 3 is a cross-sectional view of the sealing material shown in Fig. 2. An explanatory view showing the support state in the housing, FIG. 4 is a second embodiment showing the second embodiment of this invention.
FIG. 5A and FIG. 5B are sectional views corresponding to FIG. 2 showing third and fourth embodiments of this invention, respectively. 1... Molding device, 2, 20... Upper base body,
3,22...Lower base body, 4...Upper mold, 5...Lower mold, 6,21...Upper frame (cylinder), 7,23...
...Lower frame (piston), 8, 28, 37, 9, 36,
38... Slide side surface, 10... Sealing material (heat-resistant packing), 24... Lower surface of upper frame, 25... Elastic body, 26... Housing, 27... Contact surface, 3
0... Holding portion, 31... O-ring shaped sealing material, 35... Upper surface of lower frame.

Claims (1)

[Scope of Claim for Utility Model Registration] An upper mold and a lower mold are provided facing each other on both upper and lower base bodies, each surrounding the upper and lower molds and facing each other so that one is a cylinder and the other is a piston. In a molding device in which a sealing material is arranged on the sliding side surfaces of both the upper and lower frames, and the atmosphere around both the upper and lower molds can be depressurized in advance during molding with the upper and lower molds, the sealing material has an O-ring shape. and,
It is supported by a holding part of the housing that is arranged on the lower base body or the upper base body via an elastic body so as to face the lower surface of the upper frame or the upper surface of the lower frame, and when the upper and lower molds approach, the lower surface of the upper frame or the upper surface of the lower frame is pressed. A molding device characterized in that the pressing force of the sealing material against the side surface of the slide is increased by the pressure and the pressing force of the elastic body.