JPH065857Y2 - Rubber vacuum press molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vacuum press molding machine for rubber which has no bubble defects and is excellent in thermal efficiency.

(Prior Art) A rubber vacuum press molding machine is an apparatus that supplies rubber material between an upper mold and a lower mold equipped with a heating plate and press-molds while heating under vacuum. Remains in the mold, a product defect called air bubble defect due to air accumulation occurs. For this reason, the conventional rubber vacuum press molding machine is often of a type in which a groove for air suction is provided on the mating surface of the upper mold and the lower mold to make the inside of the mold vacuum. However, such a vacuum press molding machine may not be able to properly vacuum the inside of the mold depending on the shape of the product, and the pressing pressure directly acts on the seal part formed around the mold, and the seal part is a hot plate. There was also a drawback that the seal part had to be replaced in about a week because the deterioration due to heat from the inside was large.

In addition, a container-shaped vacuum case with an open top is provided around the lower mold, and the seal plate protruding around the upper mold contacts the inside of this vacuum case when the upper mold descends. A rubber vacuum press molding machine has also been developed in which both molds are enclosed in a sealed vacuum case. However, this type has a drawback in that the workability is poor because the lower mold has to be set on the bottom of the container-shaped vacuum case.

(Problems to be solved by the invention) The present invention solves the above-mentioned conventional problems and can always reliably evacuate the inside of the mold regardless of the product shape, and also improves the durability of the seal part. It has been completed to provide a rubber vacuum press molding machine which is excellent and has good workability.

(Means for Solving the Problems) The present invention made to solve the above problems is to fix an upper heating plate to the lower end of a supporting member suspended from an upper frame, and to mount a lower heating plate facing the upper heating plate. It is attached to the upper surface of a table that can be raised and lowered, and a vacuum case surrounding the outside of the upper heating plate is attached to the upper frame so that it can be moved up and down using the support member as a guide. The lower end of this vacuum case is separated from the lower heating plate on the upper surface of the table. It is characterized in that it can be abutted with the seal portion of the upper end surface of the annular member projectingly provided so as to surround the lower heating plate.

(Embodiment) The present invention will be described below in more detail based on the illustrated embodiment.

In the figure, (1) is the lower frame, (2) is the upper frame,
A cylindrical support member (3) is hung on the lower surface of the upper frame (2). (4) is an upper heating plate fixed to the lower end of the support member (3) and is heated to about 200 ° C.

On the other hand, (5) is, for example, a ram for pressurization having a thrust of 100 tons, and the upper surface of the table (6) supported by the ram (5) so as to be able to move up and down has a lower surface facing the upper heating plate (4). A hot platen (7) and an annular member (8) surrounding it are attached. Lower heating plate
(7) is also heated to about 200 ° C., and a mold (9) can be set on the upper surface thereof.

(10) is a vacuum case having an open lower surface surrounding the outside of the upper heating plate (4), and the vacuum case (10) is the support member.
It is mounted on the upper frame (2) so that it can be moved up and down by a cylinder (11) using (3) as a guide. The lower end (12) of the vacuum case (10) is an annular member (8) projecting from the lower heating plate (7) on the upper surface of the table (6) so as to surround the lower heating plate (7). It is possible to butt with the upper end surface of. As shown in the drawing, a seal portion such as an O-ring is provided on the upper end surface of the annular member (8) so that the lower case (12) of the vacuum case (10) can be reliably sealed. Also an annular member
Since (8) is provided at a position away from the lower heating plate (7) which is heated to about 200 ° C., deterioration of the seal portion due to heat is prevented.

In addition, (13) shown in FIG. 2 is a drawing mechanism of the table (6), and by this mechanism, the lower heating plate (7) and the mold (9)
Can be pulled out in the lateral direction, and operations such as filling and disassembling rubber material into the mold (9) can be performed externally.

(Operation) In the rubber vacuum press forming machine of the present invention configured as described above, first the table (6) is pulled out by the pullout mechanism (13), and the mold (9) is set on the table upper surface and the rubber is placed outside the apparatus. The dough is filled and the table (6) is returned to its original position again by the pull-out mechanism (13). Next, the vacuum case (10) surrounding the outer side of the upper heating plate (4) is used as a guide by the support member (3) as a cylinder.
(11) to lower the lower end (12) of the upper surface of the table (6) away from the lower heating plate (7) annular member (8) protruding to surround the lower heating plate (7) Make contact with the seal part on the upper end face of the in abutting state. As a result, the inside of the vacuum case (10) is sealed, so that the inside of the vacuum case (10) is depressurized to a vacuum. After that, the table (6) is raised by the ram (5) and the mold (9) is strongly pressed against the lower surface of the upper heating plate (4),
If the rubber in the mold (9) is heated and press-molded at the same time, the rubber will be vacuum press-molded.

As described above, the rubber vacuum press molding machine of the present invention evacuates the inside of the vacuum case (10) and press-molds the rubber inside the mold (9) inside, so that products such as air bubble retention defective products can be produced. Since there is no possibility of defects and the entire mold (9) is housed inside the vacuum case (10), the inside of the mold can always be surely evacuated regardless of the product shape.
Further, since both the upper heating plate (4) and the lower heating plate (7) are housed inside the vacuum case (10), heat transfer from these heating plates to the outside is reduced, and thermal efficiency can be improved. . Further, in the rubber vacuum press molding machine of the present invention, since the lower end (12) of the vacuum case (10) comes into contact with the annular member (8) in abutting state, unlike the sliding type seal, the seal portion is less likely to wear. Also, since the vacuum case (10) is hung down from the upper frame (2) and the supporting member (3) is installed as a guide so that it can be moved up and down, the molds can be set without being disturbed by the vacuum case (10). And has the advantage of excellent workability. Furthermore, since the annular member (8) is provided so as to project from the lower heating plate (7) on the upper surface of the table (6), the seal portion of the upper end surface is prevented from being deteriorated by heat and is stable for a long period of time. The sealing effect can be achieved.

(Effects of the Invention) As described above, the present invention mounts the vacuum case so that it can be moved up and down using the support member as a guide. Product defects such as defects can be eliminated. Further, in the present invention, since the annular member is provided so as to protrude from the lower heating plate, the durability of the seal portion is excellent, and the workability of setting and disassembling the mold is also good.

Therefore, the present invention has an extremely great practical value as a rubber vacuum press molding machine that eliminates the conventional problems.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway side view thereof. (2): Upper frame, (3): Support member, (4): Upper heating plate,
(6): table, (7): lower heating plate, (8): annular member, (10):
Vacuum case, (12): bottom edge.

Claims (1)

[Scope of utility model registration request] 1. A support member suspended from an upper frame (2).
The upper heating plate (4) is fixed to the lower end of (3), the lower heating plate (7) facing it is attached to the upper surface of the vertically movable table (6), and the upper heating plate (2) is heated. A vacuum case (10) that surrounds the outside of the panel (4) is attached so that it can move up and down using the support member (3) as a guide, and the lower end (12) of this vacuum case (10) is attached to the table.
The upper part of the upper surface of (6) is characterized in that it can be abutted with the seal part of the upper end surface of the annular member (8) protruding so as to surround the lower heating plate (7) at a position away from the lower heating plate (7). Vacuum press molding machine for rubber.