JPH034018B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a molding press for rubber or synthetic resin molded products, and more specifically to a molding press that is adapted to perform molding under vacuum. Regarding.

[Prior art] Rubber molded products such as O-rings and oil seals are produced by attaching the halves of a pair of molding molds that fit into each other with split molds to the upper and lower opposed hot plates of a molding press, respectively.
After charging the raw material dough inside the mold, the mold is pressed between the hot plates and heated to a temperature suitable for heat vulcanization, so that heat vulcanization and molding are performed simultaneously.

When molding rubber using such a molding press, gases generated from the raw material during heat vulcanization may remain, or air may enter the raw material.
Air bubbles remaining inside the product are the main cause of product defects, and furthermore, it takes a lot of time to vent gas (bumping) to remove the air bubbles, resulting in poor productivity.

Therefore, providing a vacuum chamber surrounding said mold;
A molding press machine has been put into practical use that eliminates the above-mentioned drawbacks, reduces the defective rate, and improves productivity by molding within the chamber.

[Problem that the invention seeks to solve]

FIG. 7 is a perspective view of essential parts showing the operation of a conventional forming press machine. In the figure, 1' is the mold mounting plate,
Reference numeral 2' denotes a chamber upper lid, and a vacuum chamber is formed by bringing the lower edge surface 2a' of the chamber upper lid 2' into close contact with the upper surface of the mold mounting plate 1'. The lower mold 3a' and the upper mold 3b' are adapted to be detachably attached to the upper surface of the mold mounting plate 1' and the lower surface of the chamber upper lid 2', respectively. When attaching and detaching the mold 3', charging the raw material to the lower mold 3a', or taking out the product, the chamber upper lid 2' is tilted as shown by the solid line in FIG. The section is open to ensure sufficient work space, and during molding,
After making the chamber upper cover 2' horizontal in order to position it between the upper plate and the lower plate that support the clamping pressure of the mold 3', it is moved backward together with the mold mounting plate 1'. By moving the chamber upper lid 2' upward and bringing it into close contact with the lower edge surface of the chamber upper lid 2', a vacuum chamber is formed as shown by the two-dot chain line in FIG.

Conventional molding press machines operate as described above, and when attaching or removing the mold, they move to the front of the machine to open the vacuum chamber, which makes the structure complicated, and the installation area is equivalent to that of the machine at the front of the machine. It was necessary to install it with room for opening the vacuum chamber.

In addition, since the chamber upper lid 2' performs a complicated operation of moving back and forth and tilting, the upper heating plate for heating the upper mold 3b' attached to the upper lid 2' is fixed to the underside of the upper plate. When the chamber upper lid 2' is positioned below the upper plate during molding, the upper die 3b' is heated through the upper lid 2', and the chamber upper lid 2' is also heated by the upper hot plate. Being done,
Not only is the thermal efficiency poor, but the sealing member interposed between the chamber top lid 2' and the mold mounting plate 1' deteriorates relatively quickly due to heat, and it is necessary to maintain the airtightness of the vacuum chamber. The problem was that the sealing member had to be replaced frequently, resulting in poor productivity.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a molding press machine that has a small installation area, has less deterioration of the sealing member for keeping the vacuum chamber airtight, and can improve productivity. do.

[Means for solving problems]

The molding press machine according to the present invention includes a hot plate that clamps and heats a molding die between an upper plate and a lower plate that face each other, and applies clamping pressure applied via the hot plate to
In a molding press machine, the mold is supported by the upper plate and the lower plate, and the mold is surrounded by a vacuum chamber so that molding can be performed under vacuum. A moving plate having a lower heating plate attached to the upper side thereof, and a moving plate rotatably disposed around a horizontal axis between the moving plate and the upper plate, and an upper heating plate attached to the lower side of the moving plate. an opening/closing board, a support block interposed between the opening/closing board and the upper board so as to be movable back and forth, and supporting the opening/closing board on the upper board; , a chamber wall whose upper part fits around the outer periphery of the opening/closing board during upward movement to form the vacuum chamber between the moving board and the opening/closing board; It is characterized by comprising an opening/closing board tilting mechanism that rotates the board and tilts it back and forth.

[Effect]

That is, during molding, a vacuum chamber is formed by the moving plate, the opening/closing plate, and the chamber wall that fits around their outer peripheries, and inside the vacuum chamber, a molding die is placed between the hot plates attached to the moving plate and the opening/closing plate. At that time, the upward clamping pressure applied to the opening/closing plate is supported by the upper plate via the support block, while the moving plate and chamber wall are used when attaching and detaching the mold, charging raw material, or taking out the product. After moving the support block backwards to create room between the opening and closing board and the upper board for tilting the opening and closing board, the opening and closing board is tilted without moving forward, and the movement and opening and closing boards are separated. In between, secure the necessary space for each of the above operations.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a partially cutaway front view of a molding press according to the present invention, and FIG. 2 is a partially cutaway right side view thereof.

In the figure, reference numeral 1 denotes a lower board fixed on a foundation with its upper surface horizontal, and a pair of side plates 3, 3 are vertically provided on both left and right sides of the lower board 1, respectively. An upper plate 2 having sufficient rigidity is fixed to the upper ends of the side plates 3, 3 with its lower surface horizontally, and the lower plate 1 and the upper plate 2 are opposed to each other with an appropriate distance apart vertically. There is.

A main cylinder 4 operated by hydraulic pressure is fixedly installed in the center of the upper surface of the lower plate 1 in order to advance its plunger ram vertically upward, and a disc-shaped moving plate 5 is attached to the upper end of the ram. It is fixed with its top surface horizontal. On the lower surface of the moving platen 5, chamber lifting cylinders 54, 54 and a medium heating plate lifting cylinder 1, which will be described later, are installed so as to cover the outer periphery of the main cylinder 4.
A cylindrical cylinder bracket 50 with an octagonal cross-section for attaching the main cylinders 3 and 13 is detachably attached, and the direction of feeding pressure oil to the main cylinder 4 can be changed to allow the plunger ram to advance (or By moving the moving platen 5 and the cylinder bracket 50 upwardly (or downwardly), both the moving platen 5 and the cylinder bracket 50 can be moved upwardly (or downwardly).

On the other hand, reference numeral 6 denotes a disc-shaped opening/closing board having the same diameter as the moving board 5, and is provided above the moving board 5 so as to face each other at an appropriate distance apart. The opening/closing board 6 includes the side plates 3,
The left and right holes at the rear of the opening/closing panel 6 are inserted into long holes 31, 31 whose longitudinal direction is in the vertical direction, formed in the roller receivers 30, 30, which are provided at the same height position on the rear inner surface of the panel 3 and protrude inward, respectively. Roller bodies 60, 60 rotatably attached to both sides are inserted and interposed between the side plates 3, 3, and horizontal rotation axes of the roller bodies 60, 60 with the axial length direction as the left and right direction. It is not only rotatable in the circumference, but also can be moved up and down by a certain amount by being guided by the elongated holes 31, 31.

Further, supports 61, 61 for horizontally supporting the upper and lower surfaces of the opening/closing board 6 are protruded from the left and right sides of the opening/closing board 6, respectively.
When it rotates counterclockwise in Fig. 2 about the rotation axis 60 and its upper and lower surfaces become horizontal,
The lower surfaces of the supports 61, 61 come into contact with the upper surfaces of stoppers 32, 32 provided inwardly protruding at appropriate positions on the inner surfaces of the side plates 3, 3 to prevent further rotation. There is. Furthermore, integral rotating arms 62, 62 for rotating the opening/closing panel 6 around the rotational axes of the roller bodies 60, 60 are erected on both left and right sides of the upper rear surface of the opening/closing panel 6, respectively. The movable arms 62, 62 rotate back and forth in accordance with the movement of the support block 7 interposed between the opening/closing board 6 and the upper board 2 so as to be movable back and forth, thereby causing the opening/closing board 6 to rotate.

The support block 7 has a height that is slightly smaller than the distance between the upper surface of the opening/closing panel 6 and the lower surface of the upper panel 2 when the upper and lower surfaces are horizontal, and the rotating arms 62, 6.
It is a rectangular parallelepiped block having a width smaller than the horizontal separation distance between the two and an appropriate depth, and a pair of rolling rollers 7 at the front and rear are mounted on both left and right sides of the upper part.
The rolling rollers 70, 70 and 71, 71 are rotatably supported around horizontal pivots with the axial direction as the left and right direction, respectively.
is the upper surface of the guide rail 33, 33, which is fixed horizontally to the upper part of the inner surface of the side plates 3, 3 with its longitudinal direction being the front-back direction, and whose rear end protrudes rearward from the rear end of the side plates 3, 3. The lower ends of the support block 7 are rolled into contact with each other, and the support block 7 is supported on the guide rails 33, 33 so as to be horizontally movable in the front-back direction. A rod locking member 7 is formed in the center of the front surface of the support block 7 in the left-right direction, with a rod locking hole 72, which is a long hole whose longitudinal direction is the vertical direction.
3 is attached, and the tip of a piston rod of a block moving cylinder 75 for moving the support block 7 back and forth is fitted into the rod locking hole 72 so as to be slidable in the vertical direction. The block moving cylinder 75 is attached to a cylinder receiver 76 that projects horizontally backward from the rear surface of the upper plate 2, with its piston rod advancing horizontally forward, and pressure oil is supplied to the block moving cylinder 75. By switching the direction and advancing (or retracting) the piston rod, the bearing block 7 can be moved forward (or backward). When the rolling rollers 70, 70 and 71, 71 come into rolling contact with the upper surfaces of the guide rails 33, 33, the guide rails 33, 33 move between the upper surface of the support block 7 and the lower surface of the upper plate 2, and between the lower surface of the support block 7 and the upper surface of the opening/closing plate 6. The support block 7 does not come into sliding contact with the upper plate 2 or the opening/closing plate 6, and the rolling rollers 70 on the upper surface of the guide rails 33, It can be easily moved back and forth by rolling of 70 and 71, 71.

Further, on both left and right sides of the lower part of the support block 7, a pair of rolling rollers 74, 74, which are designed to roll into contact with the rotating arms 62, 62, are mounted around a horizontal pivot axis with the axial length direction being the left and right direction. The rolling rollers 74, 74 are rotatably supported when the bearing block 7 moves rearward.
2 and 62, and according to the subsequent movement of the support block 7, the opening/closing plate 6 is rotated clockwise together with the rotating arms 62 and 62 to the position shown by the two-dot chain line in FIG. , the opening/closing panel 6 is tilted back and forth with its front portion facing upward. Furthermore, when the support block 7 moves forward, the opening/closing board 6 tries to rotate counterclockwise in FIG. 2 due to its own weight;
The rolling rollers 74, 74 are connected to the rotating arms 62, 6.
Since the rotation is suppressed through the block moving cylinder 75, its rotation speed corresponds to the advancing speed of the piston rod of the block moving cylinder 75. Therefore, when the opening/closing board 6 is horizontal, the supports 61, 61 are attached to the stoppers 3, which are protruded from both inner surfaces of the side plates 3, 3.
The advancing speed of the piston rod of the block moving cylinder 75 is controlled by a valve so as to be sufficiently slow to prevent it from colliding with the piston rods 2 and 32.

Now, around the outer periphery of the moving platen 5 and the opening/closing platen 6,
O-ring grooves are formed for winding the O-rings 51 and 63, respectively, and a thin cylindrical chamber wall 52 is formed on the outer peripheral surface of the moving platen 5 in the vertical direction via the O-rings 51. It is slidably fitted. The lower end of the chamber wall 52 has cylinder bases 53 and 5 which are respectively protruded outward at opposing positions on the outer surface of the cylinder bracket 50.
3, two chamber lifting cylinders 5 are installed with their piston rods extending vertically upward.
The chamber wall 52 is fixed to the upper ends of the piston rods 4 and 54, and the chamber wall 52 is moved by switching the direction of supply of pressure oil to the chamber lifting cylinders 54 and 54 and advancing (or retracting) the piston rods. It is attached so that it can be moved up (or down) relative to the moving platen 5.

When the movable plate 5 is raised to its upper limit position, the opening/closing plate 6 is in a horizontal state, and the chamber wall 52 is lifted by the operation of the chamber lift cylinders 54, 54, the upper end of the chamber wall 52 is The vacuum chamber VC (sixth
(see figure) is beginning to form. A suction pipe 55 for suctioning air and gas in the vacuum chamber VC is attached to the front upper surface of the moving platen 5 with its suction port open, and its lower end is connected to the suction pipe 55 through a vacuum hose (not shown). For example, it is connected to a vacuum generation source such as a water ring vacuum pump.

The lower heating plate 8 and the upper heating plate 9 are rectangular flat plate members of the same size with a large number of heaters embedded therein, and are located at the center of the upper surface of the moving platen 5 and the lower surface of the opening/closing platen 6, respectively. , are rectangular flat plates of approximately the same size as these, and are mounted facing each other via respective heat insulating plates 8a and 9a made of, for example, hard asbestos boards.

Above the lower heating plate 8, there is disposed a medium heating plate 10 which has a rectangular flat plate shape of the same size as the lower heating plate 8 and has a number of heaters embedded therein. The medium heating plate 10 is supported at two positions on the left and right in the center in the longitudinal direction by push-up bodies 11, 11, which will be described later. They are fixed to the upper end portions of a pair of right and left push-up rods 12, 12 that pass through them. The lower ends of the left and right push-up rods 12, 12 extending below the moving platen 5 are fixed to locking plates 12a which are horseshoe-shaped in plan view, and the locking plates 12a are attached to both left and right side surfaces of the cylinder bracket 50. The upper end portions of the piston rods of two medium-heat plate lifting and lowering cylinders 13, 13 are fixed at the positions of push-up rods 12, 12, respectively, which are fixedly installed with the advancing direction of the piston rods being vertically upward. In addition, notch grooves 10 of appropriate lengths are formed along the left and right side surfaces of the medium heating plate 10 from the rear ends thereof.
c and 10c are formed respectively, and the notch grooves 10
c, 10c, roller supports 14a, 14a fixed to the upper ends of a pair of left and right guide rods 14, 14 that vertically slide through the moving platen 5;
Rolling rollers 14a and 14b are rotatably supported around horizontal pivots with the axial direction as the left-right direction.
They are fitted so that they can freely slide in the front and rear directions. Braking plates 14c, 14c for restricting the upward movement of the rods 14, 14 are fixed to the lower ends of the guide rods 14, 14, which extend downwardly of the movable plate 5, respectively. The guide rod 1
When the guide rods 4 and 14 move upward to their upper limit positions, they come into contact with stoppers 50a and 50a protruding from appropriate positions on the outer surface of the cylinder bracket 50, thereby restricting the upward movement of the guide rods 14 and 14.

FIG. 3 is a perspective view of the medium heating plate 10 from the right front. The push-up body 11 that supports the medium-heating plate 10 has a bracket 11a formed on the rear upper surface of a rectangular parallelepiped block, and a bracket 11a formed by penetrating a long hole 11b whose length is in the vertical direction on the side surface of the block. A cylindrical convex portion 11c is protruded from the top surface of the medium heating plate 10, and the push-up body 11 is horizontally protruded toward the right at a slightly rearward position from the front-rear center of the right side surface of the medium heating plate 10. The support shaft 10a is fitted into the elongated hole 11b so as to be slidable in the vertical direction, and a flat plate-shaped plate is provided that projects horizontally toward the right at a position slightly forward from the front-rear center of the right side surface of the medium heating plate 10. protrusion 10 of
It is attached to the right side surface of the medium heating plate 10, with the convex portion 11c facing the lower surface of the medium heating plate 10. A push-up body 11 is attached to the left side of the medium heating plate 10 in exactly the same manner, and the push-up bodies 11, 11 have support shafts 10a, 10a at the lower ends of their elongated holes 11b, 11b, and protrusions 10b, By supporting 10b with its protrusions 11c, 11c, the medium heating plate 10 is supported horizontally. Then, the feeding direction of pressure oil to the medium hot plate lifting cylinders 13, 13 is switched,
By advancing (or retracting) the piston rods of the cylinders 13, 13, the medium hot plate 10
It can be moved upward (or downward) while being horizontally supported by push-up bodies 11, 11, and the medium-heating plate 10
The guide rod 14,1 moves upward according to the upward movement of the guide rod 14,1.
After the brake plates 14c, 14c fixed to the lower ends of the cylinders 4 come into contact with the stoppers 50a, 50a and the guide rods 14, 14 are stopped at that position, the piston rods of the intermediate hot plate lifting cylinders 13, 13 are not allowed to advance. Accordingly, the medium heating plate 10 is rotated as shown by the two-dot chain line in FIG.
It is designed to be tilted with the front facing up. At this time, the rolling rollers 14b, 14b move rearward while rolling within the notched grooves 10c, 10c formed on both rear side surfaces of the medium-heating plate 10, and the tilting operation of the medium-heating plate 10 is performed smoothly. work like that. Incidentally, a shaft member (not shown) such as an O-ring is attached to the penetrating portion of the drive plate 5 of the push-up rods 12, 12 and the guide rods 14, 14, respectively, and the vacuum chamber
When the inside of the VC is in a vacuum state, air is prevented from entering through the penetration portion. Further, the conductive wires of the heaters of the lower hot plate 8 and the middle hot plate 10 are connected to the lower part of the movable platen 5 from a conduit pipe 56 that opens on the rear upper surface of the movable platen 5, and the conductive wires of the heater of the upper hot plate 9 are connected to the opening/closing panel 6. These conducting wires are led out to the rear of the opening/closing board 6 from conducting wire holes (not shown) that open on the inner surface of the rear upper part of the moving board 5.
Alternatively, the penetrating portion of the opening/closing panel 6 is reliably sealed by appropriate means to prevent air from entering the vacuum chamber VC. These conductors are connected to a power source (not shown), and are connected to the upper heating plate 9 and the middle heating plate 10.
Thermocouples are attached to appropriate locations on the upper and lower heating plates 8, respectively, and the upper heating plate 9, the middle heating plate 10, and the lower heating plate 8 are controlled by intermittent control of energization to the heaters based on the detection results of the thermocouples. It is designed to be able to raise and maintain a predetermined temperature.

Now, in the molding press machine in this embodiment, a first
The molding die 15 (see FIG. 4) and the second molding die 16 (see FIG. 4) can be simultaneously clamped between the upper surface of the medium heating plate 10 and the lower surface of the upper heating plate 9. Each surface is provided with a mold locking member for locking and fixing the mold. These all have substantially the same configuration, and the configuration of the mold locking member on the upper surface of the medium heating plate 10 shown in FIG. 3 will be explained.

The mold locking member on the top surface of the medium-heating plate 10 includes a rear locking body 10d fixed to the rear portion of the top surface of the medium-heating plate 10 with its longitudinal direction being the left-right direction and having a rectangular cross section;
A pair of guides are fixed to the left and right sides of the upper surface of the medium-heating plate 10 with the longitudinal direction being the front-rear direction, and the upper halves of the mutually opposing sides form a deformed inverted L-shaped cross section with a portion protruding over the entire length of the guides. Members 10e, 10e
A pair of cylindrical front holes are fitted into a pair of locking body insertion holes 10g, 10g formed vertically through the front part of the medium-heating plate 10, and are positioned with retaining bolts 10h, 10h. Part locking body 10f, 1
0f. On the other hand, medium heat plate 10
The lower mold 16a of the second mold 16 to be secured to the upper surface has a rectangular thick plate shape, as shown by the two-dot chain line in FIG. A protrusion is provided over the entire length of the guide member 10e, and while the protrusion is inserted into the gap between the protrusion of the guide members 10e, 10e and the upper surface of the medium heating plate 10, the rear surface is connected to the rear locking part. Push lightly from the front until it contacts the front surface of the body 10d, and then insert the front locking bodies 10f into the locking body insertion holes 10.
It is attached to the upper surface of the medium-heating plate 10 by inserting it into the holes 10g and 10g. The retaining bolt 10h is screwed into a threaded hole formed in the radial direction of the center portion of the front locking body 10f in the axial direction, and a center screw hole is provided in front of the locking body insertion hole 10g. A notch 10i is formed from the top surface of the hot plate 10 to the center in the thickness direction. The front locking body 10f is inserted into the locking body insertion hole 10g from above, and at this time, when the retaining bolt 10h contacts the notch 10i with the bottom, the bolt 10h is screwed into the locking body insertion hole 10g. The tip of the bolt 10h is the locking body insertion hole 10
Press the inner wall surface of g and lock the front locking body 1 at that position.
0f is fixed. The axial dimension of the front locking body 10f is slightly larger than the thickness dimension of the medium heating plate 10, and when the locking body 10f is fixed as described above, its upper and lower ends are , a lower mold 16a of the second mold 16 that protrudes from the upper and lower surfaces of the medium-heated plate 10 and is bonded to the upper surface of the medium-heated plate 10; and a first mold that is attached to the lower surface of the medium-heated plate 10.
The upper die 15b (see FIG. 4) of the die 15 comes into contact with the front part of the upper die 15b (see FIG. 4), and its movement in the forward direction is restrained.

In this way, the lower mold 16a of the second mold 16
are the front locking bodies 10f, 10f and the rear locking body 10.
The front and rear surfaces are positioned by the guide members 10e and 10e, and the left and right sides are positioned by the guide members 10e and 10e, and the guide members 10e and 10e are used to restrain the upper and lower sides, so that they can be securely and easily secured to a predetermined position on the upper surface of the medium heating plate 10. be done. Similar mold locking members are attached to the upper surface of the lower heating plate 8, the lower surface of the middle heating plate 10, and the lower surface of the upper heating plate 9, so that the lower surface of the first mold 15 is attached to each surface. The mold 15a, the upper mold 15b, and the upper mold 16b of the second mold 16 are locked and fixed.

In addition, a pair of round holes 10j and 10j' are formed vertically through each of the four corners of the medium-heating plate 10, and a sliding rod is provided in each round hole 10j so as to be slidable in the vertical direction. The lower ends of the sliding rods 10k' are respectively fitted from the upper surface side of the medium-heating plate 10, and the upper ends of the sliding rods 10k' are inserted into each round hole 10j' so as to be slidable in the vertical direction.
0 are inserted from the bottom side, and each sliding rod 10
At the upper end of k or the lower end of each sliding rod 10k',
A spring pushing body 10l or a spring pushing body 10l' is fixed, respectively, and between each spring pushing body 10l and the upper surface of the medium heating plate 10, or between each spring pressing body 10l' and the lower surface of the medium heating plate 10, 10 m of coil springs or 10 m' of coil springs are interposed, respectively.

Thus, when the second mold 16 is clamped between the medium heating plate 10 and the upper heating plate 9, the upper end of each spring pushing body 10l is pressed against the upper heating plate 9, and the upper end of each coil spring is pressed against the upper heating plate 9. 10m urges the middle heating plate 10 and the upper heating plate 9 to separate from each other, and similarly each coil spring 10
m′ is the middle heating plate 10 and the lower heating plate 8 when the first mold 15 is clamped between the middle heating plate 10 and the lower heating plate 8.
and is biased to separate them from each other. These coil springs 10m, 10m... and coil spring 10
m', 10m', . . . serve to separate the intermediate hot plate 10 and the lower hot plate 8 and the intermediate hot plate 10 and the upper hot plate 9 during a bumping operation to be described later.

Now, the operation of the molding press according to the present invention configured as above will be explained.

The operator stands on the workbench A installed in front of the molding press machine and operates various switches arranged on the surface of the operation panel B attached to the outer surface of the right side plate 3. The molding press machine can be operated.

First, a procedure for mounting the first molding die 15 and the second molding die 16 on the lower heating plate 8, middle heating plate 10, and upper heating plate 9 will be explained. At the start of mold mounting work, the plunger rams or piston rods of the main cylinder 4, chamber lifting cylinders 54, 54, and block moving cylinder 75 are retracted to their respective retracting limit positions, and the middle hot plate lifting cylinder 1
The piston rods 3 and 13 are in a state of being advanced to their advancing limit positions. That is, the opening/closing plate 6 and the medium heating plate 10 are each in a state of being tilted with their front parts facing upward, as shown by the two-dot chain lines in FIG. 2, and the moving plate 5 has been lowered to its lower limit position. It has become a state. Now, in this state, the lower mold 15a of the first mold 15 is mounted on the upper surface of the lower heating plate 8, and the upper mold 15b is mounted on the lower surface of the medium heating plate 10. At this time, the medium heating plate 10 is placed at its upper limit position. The lower heating plate 8 attached to the upper surface of the moving plate 5 has been lowered to its lower limit position, and there is a gap between the lower heating plate 8 and the middle heating plate 10. Since a sufficient working space is secured and the lower surface of the medium heating plate 10 faces forward and downward, the lower mold 15a is pushed into the upper surface of the lower heating plate 8 from the front as described above, and the front upper surface of the It is easy to attach the front locking bodies 10f, 10f to the locking body insertion holes 10g, 10g, and to similarly push the upper mold 15b into the lower surface of the medium heating plate 10 from an obliquely upward direction.

Next, the operator operates a predetermined switch on the operation panel B to change the direction of supply of pressure oil to the medium-heat plate lifting cylinders 13, 13, and moves the piston rod back and forth to horizontally move the medium-heat plate 10. position, and then lowered to an appropriate position. In this state, the lower mold 16a of the second mold 16 is placed on the upper surface of the medium hot plate 10, and the upper hot plate 9
The upper mold 16b is attached to the lower surface, but at this time, sufficient space is secured between the medium heating plate 10 and the upper heating plate 9 attached to the lower surface of the opening/closing board 6, and the upper heating plate The lower surface of 9 faces forward and downward, so
As described above, the lower mold 16a is pushed into the upper surface of the medium-heated plate 10 from the front, and the front locking bodies 10f, 10f are inserted into the locking body insertion holes 10g, 10g formed through the front part of the lower mold 16a.
In addition, the upper mold 16b is similarly pushed into the lower surface of the upper hot plate 9 from the front obliquely upward, and the front locking body 10 is inserted into the locking body insertion holes 10g, 10g on the lower front surface of the upper die 16b.
It is easy to attach f and 10f.

In addition, the upper mold 15 attached to the lower surface of the medium heating plate 10
b is the front locking body 1 inserted into the locking body insertion holes 10g, 10g from the upper surface of the medium heating plate 10 as described above.
The front surface of the medium heating plate 10 is positioned by the projections from the lower surface of the medium heating plate 10 at 0f and 10f.

As described above, the molding molds 15 and 16 are respectively installed in their predetermined positions.Next, the operation during vulcanization molding will be explained based on the operation explanatory diagrams of FIGS. 2 and 4 to 6. do.

At the start of molding, the main cylinder 4 and the chamber lifting cylinders 54, 5
The plunger rams or piston rods of the cylinders 4 and 75 have been retracted to their respective retraction limit positions, and the piston rods of the intermediate hot plate lifting cylinders 13, 13 have been advanced to their retraction limit positions. Opening/closing panel 6 and medium heating plate 10
are tilted with their front parts facing upwards, as shown by the two-dot chain lines in FIG. Sufficient working space is ensured between the hot plates 10. In this state, the operator places a predetermined amount of raw material dough into a predetermined position on the lower mold 15a of the first molding die 15 attached to the upper surface of the lower heating plate 8, and after the preparation is completed, the operator presses the Press push button switch PB. When the push button switch PB is pressed, pressure oil is supplied to the oil chambers on the retracting side of the medium-heat plate lifting cylinders 13, 13 for a predetermined period of time, the piston rods retract by a predetermined amount, and the medium-heat plate 10 moves to the fourth position. As shown in the figure, the lower heating plate 8
It becomes horizontal and stops at a position a suitable distance away from the top. In this state, the operator places a predetermined amount of raw material dough into a predetermined position on the lower mold 16a of the second molding die 16 mounted on the upper surface of the medium heating plate 10. At this time, when the medium-heating plate 10 is lowered to its lower limit position, the working space between the medium-heating plate 10 and the opening/closing board 6 becomes wider, but in this case, the lower mold 15 of the first molding die 15
a and the upper mold 15b are close to each other, and the raw material dough previously placed on the lower mold 15a is heated by the residual heat of the medium heating plate 10 and the lower heating plate 8 during the work of arranging the raw material dough on the lower mold 16a. Since vulcanization begins and the vulcanization times in the first mold 15 and the second mold 16 are slightly different, the work of placing the raw material dough on the lower mold 16a is performed as shown in FIG. The middle heating plate 10 is placed above the lower heating plate 8 at an appropriate distance apart.

At this time, since the opening/closing board 6 is tilted as shown in FIG. 4 with its front facing up, there is sufficient working space above the medium heating plate 10 necessary for placing the raw dough onto the lower mold 16a. is secured. After placing the raw material dough on the lower mold 16a in this way,
The operator presses the push button switch PB again,
Issues a command to the forming press machine to start the next operation.

When the push button switch PB is pressed for the second time, pressure oil is first supplied to the oil chambers on the retracting side of the medium-heat plate lifting cylinders 13, 13, and the piston rod retracts to the lower limit position, and the medium-heat plate 10 moves to the second position. The spring pressing body 10 protrudes below as shown by the solid line in Figure 2.
l', 10l'... are lowered until their lower ends abut against the upper surface of the lower hot plate 8. At this time, between the middle heating plate 10 and the lower heating plate 8, the coil springs 10m', 1
There is a minute gap between the upper mold 15b of the first mold 15 mounted on the lower surface of the medium heating plate 10 and the lower mold 15a mounted on the upper surface of the lower heating plate 8, which are separated by 0 m'... It is formed.

Next, pressure oil is supplied to the advancing side oil chamber of the block moving cylinder 75, and the piston rod advances a predetermined amount and becomes horizontal on the upper and lower surfaces of the opening/closing plate 6, as shown by the solid line in FIG. moves forward until it is located above the center of the opening/closing board 6.

Next, the plunger ram of the main cylinder 4 advances, and the lower heating plate 8 and the medium heating plate 10 move upward together with the moving plate 5, and the upper surface of the spring pushers 10l, 10l... protruding from the upper part of the medium heating plate 10. comes into contact with the lower surface of the upper hot plate 9, and as the plunger ram of the main cylinder 4 further advances, the opening/closing plate 6 is guided by the elongated hole 31 formed in the roller receiver 30 and moves upward, and the support block 7
are pressed against the lower surface of the upper plate 2 through the coil springs 10m, 10m... and coil springs 10m',
10 m'... is compressed, and as shown in FIG. 5, the first molding die 15 and the second molding die 16 are
between the lower heating plate 8 and the middle heating plate 10 and the middle heating plate 10, respectively.
and the upper hot plate 9 by the pressing force of the main cylinder 4.

At this time, the support block 7 is pushed upward by the main cylinder 4 via the opening/closing plate 6, moves upward by the gap between the upper surface of the block 7 and the lower surface of the upper plate 2, and moves the opening/closing plate 6 into the upper plate 2. The tip of the piston rod of the block moving cylinder 75 for moving the block 7 back and forth is attached to the block 7 so as to be slidable in the vertical direction as described above. Due to the upward movement of the block 7, no bending force is applied to the piston rod of the block moving cylinder 75.

Due to the advancement of the plunger ram of the main cylinder 4,
After the molding molds 15 and 16 are clamped, pressure oil is supplied to the oil chambers on the advancing side of the chamber lifting cylinders 54 and 54, and the piston rod advances and the chamber wall 52 moves upward, causing the chamber wall to move upward. The upper part of 52 is fitted onto the outer peripheral surface of opening/closing board 6 to form a vacuum chamber VC as shown in FIG. At this time, the inside of the vacuum chamber VC is kept airtight by the O-ring 51 and O-ring 63 interposed between the chamber wall 52 and the movable plate 5 and the opening/closing plate 6, respectively.

Next, the vacuum valve for communicating the suction pipe 55 with the vacuum pump is opened, and the vacuum chamber is opened.
The air inside the VC is sucked into the vacuum source, and the inside of the vacuum chamber VC reaches a predetermined degree of vacuum.Then, the plunger ram of the main cylinder 4 repeats a very small amount of retraction and advancement several times every few seconds, and the moving platen 5 and the lower heating plate 8 attached to its upper surface move up and down.

Now, the heaters of the lower hot plate 8, middle hot plate 10, and upper hot plate 9 are connected to the power source at the same time as the middle hot plate lifting cylinders 13, 13 operate by pressing the aforementioned push button switch PB a second time. As described above, each of the hot plates is automatically heated to and maintained at a temperature suitable for thermal vulcanization, and the mold 15 is sandwiched between the hot plates.
Heat vulcanization begins in the molds 16 and gas is generated from the raw materials in the molds 15 and 16, and after the degree of vacuum in the vacuum chamber VC reaches a predetermined value, the main cylinder 4 is operated as described above. The reason for this is to effectively perform so-called pumping, which releases this gas to the outside.

As mentioned above, when the plunger ram of the main cylinder 4 retracts a small amount and the lower hot plate 8 descends, increasing the distance between the lower hot plate 8 and the upper hot plate 9, the upper and lower surfaces of the middle hot plate 10 Coil springs 1 placed at each of the four corners
0l, 10l... and coil spring 10l', 1
0l'... acts to hold the middle heating plate 10 at the center position in the vertical direction between the lower heating plate 8 and the upper heating plate 9.
A minute gap is created between the lower mold 15a and the upper mold 15b of the second mold 15 and between the lower mold 16a and the upper mold 16b of the second mold 16, and the gas generated from the raw material dough is The vacuum chamber VC passes through this gap.
The liquid then passes through the suction pipe 55 and is sucked into the vacuum pump.

Furthermore, by moving the lower heating plate 8 up and down, the middle heating plate 10 is also moved up and down via the coil springs 10l', 10l'..., and the lower mold 1 of the molds 15, 16
5a and 16a vibrate to promote the precipitation of gas generated inside the raw dough to the outside.

After the bumping is completed, the main cylinder 4 operates to press the moving platen 5 upward at a predetermined pressure for a preset predetermined period of time, and the first molding metal is placed between the lower hot plate 8 and the middle hot plate 10. A second molding mold 16 is clamped between the mold 15 and the medium hot plate 10 and the upper hot plate 9, and vulcanization molding is performed simultaneously in both molds.

In addition, after bumping is completed, the vacuum chamber VC
Since there is no need to maintain a vacuum inside, the vacuum valve is closed as soon as bumping is completed, and the suction pipe 55 is closed.
The vacuum break valve for releasing the chamber to the atmosphere is opened, and the inside of the vacuum chamber VC becomes atmospheric pressure.

Now, after the predetermined period of time has elapsed, the heaters of each hot plate are cut off from the power supply, and pressure oil is first supplied to the oil chambers on the retraction side of the chamber lifting cylinders 54, 54, and as the piston rods retract, the chamber wall 52 moves downward, and then the plunger ram of the main cylinder 4 retracts, and the moving platen 5 moves downward, thereby removing the second molding die that was clamped between the middle hot plate 10 and the upper hot plate 9. The lower mold 16a and upper mold 16b of 16 are vertically separated. Further, pressure oil is supplied to the oil chamber on the retraction side of the block moving cylinder 75, and the retraction of the piston rod causes the support block 7 to move toward the guide rail 3.
3, 33 and moves horizontally backward, and the opening/closing board 6 is moved horizontally backwards after the rolling rollers 74, 74 pivotally supported on both left and right sides of the front part of the block 7 roll into contact with the front surfaces of the rotating arms 62, 62. , according to the movement of the block 7,
That is, in response to the retraction and retraction of the piston rod of the block moving cylinder 75, it stops at a position tilted at a predetermined angle with its front portion facing upward.

All operations up to this point after the push button switch PB is pressed first are performed automatically, and the operator presses the lower mold 16 of the molding die 16 on the upper surface of the medium heating plate 10 in this state.
Take out the molded product from a.

After removing the product, the operator presses the push button switch PB.
When pressed, pressurized oil is supplied to the oil chambers on the advance side of the medium-hot plate lifting cylinders 13, 13, and as the piston rod advances, the medium-hot plate 10 moves up through the push-up rods 12, 12 and the push-up bodies 11, 11. It is pushed up while keeping the top and bottom surfaces horizontal. And medium heat plate 10
The guide rods 14, 14 attached to the rear part of the cylinder via rolling rollers 14b, 14b also move upward as the medium-heating plate 10 rises, and the brake plates 14c, 14c fixed to the lower ends of the guide rods When the guide rods 14, 14 come into contact with the stoppers 50a, 50a on the outside, the subsequent upward movement of the guide rods 14, 14 is restricted, and the medium-heating plate 10
The rear part of the medium-heated plate 10 also stops at the height position at that time, and as the piston rod of the medium-heated plate lifting cylinders 13, 13 advances, the medium-heated plate 10 moves to the rolling rollers 14b, 14.
Using the position b as a fulcrum, the cylinders 13, 13 are gradually tilted with the front part upward, and when the cylinders 13, 13 advance to their limit positions and stop, the position shown in Fig. 2 is 2.
As shown by the dotted chain line, it comes to a state where it is tilted at a predetermined angle and then stops. Then, the operator takes out the molded product from the lower mold 15a of the molding die 15 on the upper surface of the lower hot plate 8, and the series of operations is completed.

At this time, the positional relationship among the moving platen 5, medium heating plate 10, opening/closing plate 6, and chamber wall 52 has returned to the initial state described in the operation explanation, and from now on, by repeating the same operation, molded products can be manufactured continuously. can be produced.

Although this example describes the case where a single forming press is used, a plurality of forming presses are usually installed in parallel, and the raw material dough is prepared in one forming press. During this time, vulcanization molding is performed in another molding press, thereby making effective use of the time required for hot vulcanization.

〔effect〕

As described in detail above, in the molding press according to the present invention, the chamber wall fitted around the outer periphery of the moving plate moves upward during molding, and its upper part fits around the outer periphery of the opening/closing plate. A vacuum chamber is formed by the opening/closing board and the chamber wall, while the moving board and chamber wall move downward and the opening/closing board moves forward when attaching or removing the mold, loading raw materials, or taking out the product. Since the machine can be tilted without tilting, sufficient work space is secured above the moving plate for each of the above-mentioned operations, so there is no need for a space at the front of the machine to open the vacuum chamber, which was previously required, and the installation area is reduced. Since the operation of the moving plate and opening/closing plate is simple, a hot plate can be installed on the top surface of the moving plate and the bottom surface of the opening/closing plate via a heat insulating plate, and the heat of the hot plate is transferred to the moving plate and opening/closing plate. This provides excellent effects such as improved thermal efficiency and the ability to maintain airtightness of the vacuum chamber for a long period of time without replacing the sealing member.

In addition, as shown in this embodiment, by making the moving plate and the opening/closing plate into disk shapes and making the vacuum chamber into a cylindrical shape, processing of the fitting portions thereof is facilitated.
Although it is possible to use commercially available O-rings as the sealing member, it goes without saying that these are not limited to those shown in this embodiment and may have any shape.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway front view of a molding press according to the present invention, FIG. 2 is a partially cutaway right side view thereof, and FIG. 3 is a medium-heated press machine. A perspective view of the plate 10, FIGS. 4, 5, and 6 are operation explanatory views, and FIG. 7 is a perspective view of the main parts of a conventional forming press. 1...Lower plate, 2...Upper plate, 4...Main cylinder,
5...Moving plate, 6...Opening/closing plate, 7...Support block, 8...Lower hot plate, 9...Upper hot plate, 10...Medium heat plate, 13...Medium heat plate lifting cylinder, 52... ...Chamber wall, 54...Chamber lifting cylinder, 75...
...Block moving cylinder, VC...Vacuum chamber,
A...Workbench, B...Control panel.

Claims (1)

[Claims] 1. A hot plate that clamps and heats a molding die is disposed between an upper plate and a lower plate that face each other, and the clamping pressure applied via the hot plate is applied to the upper plate. In a molding press that is supported by a plate and a lower plate, and the mold is surrounded by a vacuum chamber so that molding can be performed under vacuum, the mold is disposed between the upper and lower plates so as to be vertically movable. , a moving plate having a lower heating plate attached to its upper side, and an opening/closing device having an upper heating plate attached to its lower side, which is rotatably arranged around a horizontal axis between the moving plate and the upper plate. a support block that is interposed between the opening/closing board and the upper board so as to be movable back and forth and supports the opening/closing board on the upper board; a chamber wall whose upper part fits around the outer periphery of the opening/closing board during movement to form the vacuum chamber between the moving board and the opening/closing board together with the vacuum chamber; A molding press machine characterized by being equipped with an opening/closing plate tilting mechanism that rotates and tilts back and forth.