JPH04103308A - Vacuum press device - Google Patents

Abstract

PURPOSE:To make a device compact and simplify and quicken the operation by storing a top force and a bottom force in a box-shaped body placed on a press stand, also storing wirings, pipings and the like for supplying a heat source to a hot platen for heating from an unused space. CONSTITUTION:A ram 78 is drawn into the. side of a cylinder 79 and a front plate 72 is moved downward, and an opening between side plates 54 is opened. A rubber base is placed on a bottom force 91, and powder or vapor is supplied from an unused space 57a in a chamber space 57 between chamber spaces to hot platens 59 and 60 to heat a top force 90 and the bottom force 91, and the front plate 72 is closed to close the chamber space 57 and a vacuum pump is driven to vacuumize the inside of the chamber space 57 through the piping. A cylinder 67 is driven and a ram 64 is moved upward to bring the bottom force 91 into contact with the top force 90, and the heated rubber base in the flowing state is molded. Foams, therefore, are not generated on the surfaces of products, and defective products are not generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a vacuum press apparatus for vulcanization molding of rubber.

Conventional technology Rubber products used as cushioning materials, insulating materials, and other devices and parts are required in a wide range of fields such as vehicles, industrial machinery, office equipment, household equipment, etc., and have various forms. Generally, vulcanization molding is performed by a vacuum forming method using a mold. That is,
When molding rubber dough that becomes fluid when heated, if molded in the air, the rubber dough will cover the top surface of the lower mold.
The air in between remains as bubbles on the surface of the rubber product, resulting in the production of defective products with so-called cavities. However, when molded in a vacuum, no air bubbles are generated, so a good product can be obtained.

Therefore, the conventional vacuum forming method uses the structural principle shown in FIG. 4 and subsequent figures. In FIG. 4, an upper mold mounting plate 3 is fixed in close contact with the upper surface of the vacuum case 2 covered with a heat insulating cover 1, an upper mold 4 is fixed to the upper mold mounting plate 3, and the vacuum case 2 A lower mold mounting plate 6 is provided with a gasket 5 attached to the outer periphery to slide on the mirror-finished inner surface, and a lower mold 7 is fixed to the lower mold mounting plate 6. Heat plates 8.9 using electricity or steam as a heat source are attached to the upper surface of the upper mold 4 and the lower surface of the lower mold mounting plate 6, respectively. The rubber dough 10 is placed on the lower mold 7. In this vacuum press, the upper mold 4 and the lower mold 7 are brought into alignment within the vacuum case 2 by moving the lower mold mounting plate 6 in the vertical direction.

In addition, in FIG. 5, a lower mold 13 is fixed to the upper surface of the lower mold mounting plate 12 to which the upper heating plate 11 is attached, a middle mold 14 is placed on the lower mold 13, and an upper mold 15 is placed on the middle mold 14. Put it on,
A column 18 having an upper mold 15 fixed to an upper mold mounting plate 16 and having an upper heating plate 17 that descends toward the upper mold mounting plate 16.
is tightly engaged with the vacuum frame 20 by the sliding gasket 19, and
The periphery where this vacuum frame 20 contacts the lower die mounting plate 12 has zero
A ring 21 is attached. This vacuum press
By lowering the column 18 together with the vacuum frame 20 toward the lower die mounting plate 12, the O-ring 21 is attached to the lower die mounting plate 12.
At the same time, the upper heating plate 17 contacts and heats the upper mold mounting plate 16, and presses the upper mold 15, the middle mold 14, and the lower mold 13.

Furthermore, in FIG. 6, the lower mold 23 fixed to the lower mold mounting plate 22 and the upper mold mounting plate 25 fixed to the upper mold mounting plate 24 are provided with skirts 26 and 27 that fit into each other, and the lower mold mounting plate 25 is fixed to the lower mold mounting plate 22. When molding is performed by moving the plate 22 and/or the upper die mounting plate 24 toward the other and matching them, the interior surrounded by the skirts 26 and 27 is evacuated.

Therefore, in order to assemble the upper die block and lower die block to the press body and make them operable, for example, the upper die block and the lower die block can be moved up and down on the press body, and the rubber fabric is placed on the press body. In addition to matching the lower mold block and upper mold block, a vacuum case, a vacuum suction device, and its piping that surround them and create a vacuum state are attached. A heating plate for heating the rubber fabric and wiring or piping to supply the heat source were installed. The heat source is electricity or steam. When using steam as a heat source, a steam boiler and its piping, and a steam header for distributing and supplying steam to the upper mold block and lower mold block, respectively, are also required.

Problems to be Solved by the Invention However, according to the above-mentioned conventional vacuum press equipment, it goes without saying that the mechanical structure of the press body is generally complex, and there are many attached devices, wiring, and piping. The configuration of a single unit is generally complex and large, and it requires a large amount of space.

In particular, in the conventional example shown in Fig. 114, the gasket 5 moves away from and into the vacuum case 2, so the gasket 5, which is most important for ensuring a vacuum state, breaks in a short period of time, shortening its lifespan. short.

Furthermore, the height of the vacuum case 2 poses a processing problem, and the thickness of the upper and lower molds 4 and 7 is limited, so that only thin molds can be applied. Furthermore, installation of the upper mold 4 was difficult, and vacuum leakage occurred. In addition, there were other problems such as difficulty in wiring the upper heating plate 8.

Furthermore, according to the conventional example shown in FIG.
Since the O-ring 21 is at a high temperature, the material of the O-ring 21 that comes into contact with the O-ring 21 must be made of a special heat-resistant material, which is expensive. As the thickness of the upper mold 15 and the lower mold 13 increases, the length of the column 18 also inevitably increases.
Therefore, the shape of the entire press becomes larger. Upper hot plate 1
Since the wiring No. 7 passes through the inside of the column 18, there are problems such as difficulty in processing the wiring.

According to the conventional example shown in FIG.
．． 27 must fit in and out in an airtight manner, so they must be made precisely and are expensive.Moreover, they must be fitted together precisely, and if this happens even slightly, the vacuum will fail. In addition to leakage, the skirt 26
．． There were problems such as damage to the 27 itself.

Therefore, the present invention was made to provide a vacuum press that eliminates the drawbacks of the above-mentioned conventional examples.

Means for Solving the Problems In order to solve the above problems, the present invention provides a box-like body that can be sealed on a press stand, and has an idle space inside the box-like body so that at least an upper die and a lower die can be separated. One of them is stored so that it can be raised and lowered toward the other, and parts such as wiring or piping for supplying a heat source to the heating platen that heats the upper mold and the lower mold, respectively, are stored in the idle space, and We constructed a vacuum press device that can create a vacuum inside a box-shaped body.

Function According to the above structure of the present invention, when the rubber fabric is placed on the lower mold, the inside of the box-shaped body is kept in a vacuum state, and the upper mold and the lower mold are matched and vulcanization molded, air bubbles form on the product surface as nests. There is no room for this to occur, and therefore good vulcanization molding of rubber fabric is easy and
Quick and easy. Furthermore, since not only the upper and lower molds but also the wiring and piping of the heating plate are housed within the box-shaped body, the entire apparatus can be made more compact.

EXAMPLES Examples of the present invention will be described below with reference to the drawings. 1st
The figure is a front view, and Figure 2 is a side view. In the figures, 51 is a base, 52 is a press stand fixed to the upper surface of the base 51, 53 is a head of the press stand 52, and 54 is on both left and right sides of the head 53. A side plate (side plate) to be mounted, 55 a top plate (top plate) supported on the upper part of the side plate 54.54, 56 a peripheral edge between the head 53 of the press stand 52, the top plate 55 and the side plate 54.54. This is a back plate with parts closely connected. Thus, the press body includes the head 53 of the press stand 52, the side plates 54, 54,
The interior of the box-shaped body surrounded by the top plate 55 and the back plate 56 forms a chamber space 57.

In 22, the base 51 extends the rear part to make it larger, and
By increasing the width of the side plates 54, 54 accordingly, the volume of the chamber space 57 can be increased. In the chamber space 57, a heating plate 59 is fixed to the lower surface of the top plate 55, an upper mold 90 is fixed and suspended in contact with the heating plate 59, and a lower mold is placed opposite to the upper mold 90. A mold 91 is placed on a hot platen 60 and fixed to a table 62, and the table 62 is fixed to a head 64a of a ram 64 that extends and retracts from a press stand 52.

These, the heating plate 59, the upper mold 90. Lower mold 91, heating plate 60. The tables 62 are arranged directly above the press stands 52, and therefore, an idle space 57a in the chamber space 57 is formed between these and the back plate 56.

The ram 64 is attached to the head 5 of the press stand 52.
The press stand 52 has a gland 63 that stops on the upper surface of the press stand 52 and fits into a cylinder 67 formed in the press stand 52 through a through hole 66 formed in the head 53. cylinder 6
A pipe for supplying and discharging pressure oil from a hydraulic system is connected to 7 and the piston portion 68 of the ram 64. Furthermore, each of the side plates 54 and 54 has a base 51.
Elongated guide plates 69.69 reaching from the top plate 55 are connected to each other, and as shown in FIG. A front plate 72 (front plate) is provided on the front surface, which is an opening between the guide plates 69 and 69, so as to be movable in the vertical direction. This front plate 72 is connected to the side plate 54.
The width dimension between the press stand 52 and the top plate 55 is approximately the same as the height dimension between the press stand 52 and the top plate 55, and is for sealing the chamber space 57. Cam followers 73 and 74 that engage with the cam 7071 are attached to the left and right sides of the front plate 72. Further, a bracket 75 is fixed to a substantially central portion of the front surface of the front plate 72 so as to protrude horizontally, and a ram head 76 is connected to the bracket 75 by a pin 77. The ram 78 integrated with the ram head 76 is fitted into a cylinder 79, and the cylinder 79 is rotatably supported by a bracket 80 fixed to the base 51 with a pin 81. cylinder 79
Piping that supplies and discharges pressure oil from the hydraulic system is connected to. A chamber space 5 is provided at the rear of the top plate 55.
Piping (not shown) from a vacuum suction pump that pulls the air from No. 7 to create a vacuum is provided through the tube.

Note that when the heating plate 5960 is of an electric heating type, the wiring for supplying electricity to it is flexible and has a sufficient length and is placed in the idle space 57a in the room space 57, passing through the rear part of the top plate 55. It extends to the back and is connected to the power supply. When the heating plates 59 and 60 are of the steam heating type, a steam header (not shown) is placed in the idle space 57g, and flexible piping connecting to the upper heating plate 59 and the upper heating plate 60 is housed therein. , the piping connecting the steam header to the steam supply source is connected to the top plate 5.
5 through the rear part.

To explain the operation of the above embodiment, as shown in FIG. 2, when opening and closing the front plate 72,
Pressure oil is supplied to the cylinder 79 to move the ram 78 up and down. Therefore, when the ram 78 protrudes upward from the cylinder 79, the front plate 72 moves toward its cam follower 73.
74 moves upward along cam 70.71, and cam 70.74 moves upward along cam 70.71.
71, the front plate 72 comes into close contact with the front surfaces of the side plates 54, 54, head 53, and top plate 55, sealing the chamber space 57. Conversely, when the ram 78 is retracted toward the cylinder 79, the front plate 72 moves downward away from the tight lower surface to open the opening between the side plates 54 and 54. Therefore, with the opening open, the rubber fabric is placed on the lower mold, and electricity or steam is supplied to the heating plates 59 and 60, respectively, to heat the upper mold 9.
0 and the lower mold 91 are heated, and then the front plate 72 is closed to seal the chamber space 57, and the vacuum pump 82 is heated.
The cylinder 67 is driven to evacuate the chamber space 57 through the piping 83, and when the chamber space 57 is in a vacuum state, the cylinder 67
is driven, the ram 64 is moved upward, and the lower die 91 is brought into pressure contact with the upper die 90.

As a result, the heated and fluidized rubber dough is molded in a vacuum. Therefore, no bubbles are generated on the surface of the product, and no product defects occur.

According to the present invention described in detail, the upper mold and the lower mold are housed in a sealable box-shaped body formed in the press body, and an idle space is formed in the box-shaped body to provide a heat source to the heating platen. Since the various parts that supply the vacuum press can be stored together, the vacuum press equipment can be made compact and small, the installation space can be reduced, and handling and operation are simple and easy.
Fast and easy. Furthermore, it is extremely economical because it does not use expensive gaskets as in the conventional case.

Furthermore, since the volume inside the box can be set in any way, the number of heating platens can be stacked in any number of stages, and since the heating platen is housed inside the box-shaped body, it is efficient for heat to escape during molding. The molding temperature is low and good molding is possible. Furthermore, since the inside of the box-shaped body is kept in a vacuum state, the suction force of the cylinder, etc. for moving the lower die can be much smaller than that of the conventional example.

[Brief explanation of the drawing]

Fig. 1 is a front view of the vacuum press apparatus according to the present invention, Fig. 2 is a front view of the vacuum press apparatus according to the present invention;
The figure is a side view, Figure 3 is an explanatory diagram of the action, Figures 4 to 6
The figures are longitudinal cross-sectional views showing the main parts of the conventional example. 51...Base, 52...Press stand, 53.
...Press stand head, 54...Side plate, 55...Top plate, 56...Back plate, 57...Room space, 57a...Idle space,
59, 60...Heat plate, 90...Upper mold, 91...Lower mold, 64...Ram, 67...Cylinder, 69...
・Guide plate, 70°71...Cam, 72...
Front plate, 73...1 person outside cam follower Fig. 6

Claims (1)

[Claims] (1) A sealable box-like body is mounted on a press stand, and an idle space is provided in the box-like body to house an upper mold and a lower mold so that at least one of them can be raised and lowered toward the other; In addition, parts such as wiring or piping for supplying a heat source to the heating platen that heats the upper mold and the lower mold, respectively, are stored in the idle space, and the inside of the box-like body can be kept in a vacuum state. Features vacuum press equipment.