JPH0335039B2 - - 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 on the upper and lower opposing 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. 5 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 top lid 2' horizontal so that it is positioned 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', and the mold mounting plate 1' is By moving it upward and bringing it into close contact with the lower edge surface of the chamber upper cover 2', a vacuum chamber is formed as shown by the two-dot chain line in FIG.

In such a conventional forming press machine, the vertical dimension of the vacuum chamber is determined by the depth dimension of the chamber upper lid 2', and the thickness of the molding die 3' that can be clamped is determined by this vertical dimension. Therefore, there was a problem in that it could not be applied to high-mix, low-volume production using molds of various thicknesses.

In addition, the operations of the mold mounting plate 1' and the chamber top cover 2' when forming the vacuum chamber are complicated, and it is troublesome to manually operate actuators such as hydraulic cylinders for operating them. The problem was that it required a device to automatically operate the two in conjunction with each other.

Therefore, a device in which the chamber can be moved up and down has been proposed (for example, Utility Model Publication No. 15974, 1973).
However, there was a lot of waste in the structure, and there were problems with the durability of the sealing member for maintaining the vacuum.

The present invention has been made in view of the above circumstances, and provides a molding press machine that can clamp molding molds of various thicknesses, has no structural waste, and has a highly durable sealing member. The purpose is to provide.

[Means for solving problems]

The forming press according to the present invention includes a lower heating plate attached to the upper side of the movable plate which is arranged vertically movably between an upper plate and a lower plate facing each other, and a lower heating plate attached to the lower side of the upper plate. A molding die is clamped between the upper hot plate and the lower plate and the upper plate support the clamping pressure applied through the lower hot plate and the upper hot plate, while the mold is placed in a vacuum chamber. In a molding press machine which is surrounded by walls and can perform molding under vacuum, the movable plate is fitted around the outer periphery of the movable plate so as to be movable up and down, and when moving upward, its upper part fits into a part of the upper plate. The present invention is characterized in that a cylindrical chamber wall is provided between the movable plate and the upper plate, forming the vacuum chamber together with the movable plate and the upper plate.

[Effect]

That is, during molding, the movable platen is moved upward, a molding die is clamped between a lower heating plate provided above the movable platen, and an upper heating plate provided below the upper platen, and the movable platen is moved upward. The chamber wall fitted around the outer periphery of the mold is moved upward by a length corresponding to the thickness of the mold to fit a part of the upper plate, and the movable plate, the upper plate, and the chamber wall are combined. , forming a vacuum chamber containing the upper hot plate, the lower hot plate, and a molding die therein;

〔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 forming 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 base, and on the upper side thereof, a lower board 2 having a substantially square shape in plan view and having sufficient rigidity is fixed with the upper surface being horizontal and the side surfaces facing forward, backward, left, and right, respectively. . Brackets 2a, 2a, . . . which are semicircular in plan view are protruded from the front and rear portions of both left and right sides of the lower board 2, respectively, and each of these brackets has one column insertion hole 2b, 2b, . is formed concentrically with the semicircle and penetrated in the vertical direction. These pillar insertion holes 2b, 2b... have a long cylindrical shape, and have threaded parts 3a, 3b at the bottom and top, respectively.
The lower portions of columns 3, 3... are loosely inserted, and the columns 3, 3... tighten a pair of lower holding nuts 3c, 3d screwed into the threaded portion 3a, and tighten the nuts 3c, 3d. At the bracket 2a
By applying pressure to the upper and lower surfaces of each bracket 2,
They are erected perpendicularly to the upper surface of the lower board 2 at positions a, 2a, . . . , ie, at the four corners of the lower board 2.

The upper plate 4 arranged above the lower plate 2 and spaced apart by an appropriate length has substantially the same shape as the lower plate 2 in plan view,
It is a thick plate-like member with sufficient rigidity. Lower board 2
There are also strut insertion holes 4b, 4b in the four corners of the upper plate 4 corresponding to the positions of the strut insertion holes 2b, 2b...
... is formed to penetrate in the vertical direction, and the upper board 4 is
The upper parts of the pillars 3, 3... are loosely inserted into these pillar insertion holes 4b, 4b, respectively, and a pair of upper holding nuts 3 are screwed into the threaded portions 3b of each pillar 3.
By tightening the nuts 3e and 3f and pressing the upper and lower surfaces with the nuts 3e and 3f, the columns 3, 3...
It is fixed to the top of the board with its bottom surface horizontal. By moving the positions of the nuts 3e and 3f, the height of the upper plate 4 can be adjusted as appropriate within the range in which the threaded portion 3b is formed.

A main cylinder 5 operated by hydraulic pressure is fixed to the center of the upper surface of the lower plate 2 with its plunger ram 5a extending vertically upward. The upper part of the plunger ram 5a is fitted concentrically with the lower part of a movable platen 6 whose upper part is formed into a disk shape. It moves up and down with its top surface horizontal. A plurality of support bolts 6a, 6a... are attached to the lower surface of the upper part of the movable platen 6, facing vertically downward, and the lower ends of these bolts 6a, 6a...
A guide plate 7 having a rectangular flat plate shape is attached.
A cylinder insertion hole 7a having a diameter larger than the outer diameter of the main cylinder 5 is formed in the center of the guide plate 7, and reinforcing plates 7b, 7b, . Guide holes 7c, 7c, . . . passing through the plate 7 are formed. The guide plate 7 has the support posts 3, 3 in the guide holes 7c, 7c...
With the upper part of the main cylinder 5 loosely inserted into the cylinder insertion hole 7a, the support bolts 6a, 6a, . The guide holes 7c, 7c, . . . slide against the support columns 3, 3, . . . to function as a tracing member when the movable platen 6 moves up and down.

Further, an O-ring groove is formed on the outer periphery of the upper part of the movable platen 6, and an O-ring 6b is attached thereto.
A cylindrical chamber wall 8 is fitted through the O-ring 6b so as to be slidable in the vertical direction. An edge portion 8a having the same outer shape as the guide plate 7 is connected to the outer periphery of the lower end of the chamber wall 8, and the four corners of the edge portion 8a are provided with the same shape as the guide plate 7. Reinforcing plates 8b, 8b, . . . are fixed, and guide holes 8c, 8c, . The chamber wall 8 is fitted around the outer periphery of the movable platen 6 as described above, with the pillars 3, 3... being slidably fitted into the guide holes 8c, 8c, respectively. The edge 8a is the guide hole 8
Due to the sliding of c, 8c... on the pillars 3, 3...,
It functions as a tracing member when the chamber wall 8 moves up and down. Chamber lifting cylinders 9 for vertically moving the chamber walls 8 are disposed on each of the left and right sides of the press body, and are fixed to the lower side of the guide plate 7.

A piston rod 9a of the cylinder 9 passes through the guide plate 7 and projects above it, and the tip of the rod 9a is engaged at an appropriate position on the edge 8a. On the other hand, on the lower side of the upper platen 4, a chamber body 40 having a short cylindrical shape and having an outer diameter equal to the outer diameter of the movable platen 6 is protruded and aligned with the movable platen 6 in plan view. It is set up. The chamber body 40
Similarly to the outer periphery of the movable body 6, there is an O
A ring groove is formed, and an O-ring 41 is attached thereto.

As a result, the movable platen 6 moves upward as the plunger ram 5a of the main cylinder 5 moves forward, and the chamber wall 8 moves upward as the piston rod 9a of the chamber lifting cylinder 9 moves upward, following the pillar 3 as a guide.
When the upper end of the chamber wall 8 reaches the height of the chamber body 40, the inner circumferential surface of the chamber wall 8 is fitted to the outer circumferential surface of the chamber body 40 via the O-ring 41, and the upper plate 4 A vacuum chamber VC (see FIG. 4) is formed, which is surrounded by a chamber body 40, a chamber wall 8, and a movable platen 6, and whose interior is kept airtight by an O-ring 6b and an O-ring 41. .

The lower hot plate 10 and the upper hot plate 11 are rectangular flat plate members of the same size in which a plurality of rod-shaped heaters H, H... are embedded, respectively, and are formed into rectangular flat plates of approximately the same size. They are fixed to the center of the upper surface of the movable platen 6 and the center of the lower surface of the upper platen 4, facing each other, via heat insulating plates 10a and 11a made of, for example, hard asbestos plates. The conductors of the heaters H, H... of the lower hot plate 10 are connected to the lower hot plate 10.
Conduit pipe 6 that opens on the top surface of movable platen 6 at the rear of
1 to the lower side of the movable platen 6 and the conductors of the heaters H, H, etc. of the upper hot plate 11 are routed from the conductor hole 42 that opens on the lower surface of the upper plate 4 behind the upper hot plate 11 inside the chamber body 40. , are led out to the rear of the upper panel 4, and are connected to a power source (not shown). Movable plate 6
The penetration part of the conductor in the upper panel 4 is hermetically sealed with an appropriate sealing means, and when the inside of the vacuum chamber VC is maintained in a vacuum state, air is allowed to pass through the penetration part into the chamber VC. prevents intrusion.

In addition, at appropriate locations on the lower hot plate 10 and the upper hot plate 11,
Thermocouples (not shown) are attached to each of them, and the lower heating plate 10 and the upper heating plate 11 are heated to a predetermined temperature by controlling the energization of each heater H, H, etc. on and off based on the detection results of the thermocouples. , it is now possible to maintain it.

In addition, an intake hole 43 for sucking air and gas in the vacuum chamber VC is formed to vertically penetrate the upper plate 4 and open at a position rearward of the upper hot plate 11 inside the chamber body 40. One end of an intake hose 44 is connected to the intake hole 43 . The other end of the intake hose 44 is branched into two directions, one of which is connected to a vacuum source using a water ring vacuum pump or the like via a vacuum valve (not shown), and the other is connected to a vacuum source using a water ring vacuum pump or the like. It is opened to the atmosphere via a vacuum breaker valve (not shown). As described above, the main cylinder 5 and the chamber lifting cylinder 9 move forward, so that the chamber wall 8
moves upward to form a vacuum chamber VC, and when the vacuum valve is opened, the chamber VC is communicated with a vacuum source and evacuated until a predetermined degree of vacuum is reached, and the vacuum breaker valve is opened. When opened, the chamber VC is opened to the atmosphere, and the pressure inside the chamber VC becomes atmospheric pressure.

Now, 12 in FIG. 2 is a workbench formed by combining rectangular flat plates having a width corresponding to the outer diameter of the movable platen 6 in an inverted L shape, and corresponds to the short side of the L shape. Align the working surface 12a of the movable platen 6 flush with the top surface of the movable platen 6 when it is lowered to its lower limit position, and align the lower part of the leg portion 12b corresponding to the long side of the L-shape of the lower platen 2. It is fixed to the front surface and attached to the front side of the molding press as shown in FIG. Work surface 1
A pair of trolley guide rails 13, 13 are mounted on 2a so as to be slidable in the direction along the extension lines of the left and right sides of the lower heating plate 10, respectively, with the inner sides thereof aligned. The rails 13, 13 are in a standby position where one end thereof is aligned with the end of the work surface 12a near the movable platen 6, as shown by the two-dot chain line in FIG. 2, or in a standby position, as shown by the solid line in FIG. As shown, the other end of the movable platen 6 is locked at one of the working positions that is aligned with the end of the working surface 12a on the opposite side of the movable platen 6, and the standby position and the working position are different from each other. Movement between them is done manually.

A pair of mold carriers 14, 14 each having three rolling wheels are attached to the guide rails 13, 13 from above. The lower die 15a of the molding die 15, which is clamped between the lower hot plate 10 and the upper hot plate 11, is mounted between the die carriers 14 and 14 and attached to the upper part thereof. , guide rails 13,1 together with the trolleys 14,14
3 and can be easily moved over its entire length. When the guide rails 13, 13 are in the working position, the lower mold 15a grasps the handle T attached to the front side of the lower mold 15a and pushes and pulls it to move the lower hot plate 10 from above the working surface 12a.
can be moved along the guide rails 13, 13 to a position where one end thereof is placed on the front part of the
Furthermore, a stop plate 1 is installed at the rear of the lower heating plate 10.
The lower mold 15a can be correctly placed at a predetermined position on the lower hot plate 10 by pushing it in the direction of the lower hot plate 10 until its tip abuts against the lower hot plate 10b. At this time, the inner surfaces of the carts 14, 14 abut on both left and right side surfaces of the lower hot plate 10, respectively, and restrain the left-right position of the lower die 15a.

The upper mold 15b of the molding die 15 is paired with the lower mold 15a positioned on the lower hot plate 10 in this way.
is attached to the lower surface of the upper hot plate 11 with mold attachment bolts (not shown).

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

The operator stands at the front side of the forming press machine (on the left side in FIG. 2) and supplies pressure oil to, for example, the main cylinder 5, which is provided on the operation panel 20 shown by the two-dot chain line in FIG. Main cylinder lever 2 that changes direction
1. Lifting cylinder lever 22 that switches the feeding direction of pressure oil to the chamber lifting cylinder 9, lower hot plate 10
and a heater switch 23 that turns on and off the heaters H, H, etc. of the upper hot plate 11, and a valve operation switch 24 that opens and closes the vacuum valve and the vacuum break valve.
The molding press machine is operated by operating various levers and switches such as.

At the start of work, the plunger ram 5a of the main cylinder 5 and the piston rod 9a of the chamber lifting cylinder 9 are retracted to their respective retracting limit positions, and the movable platen 6 and the chamber wall 8 are retracted.
is lowered to its lower limit position, and as shown in Figures 1 and 2.
As shown in the figure, the upper end of the chamber wall 8 is located below the upper surface of the movable platen 6. Further, the upper plate 4 is fixed at an appropriate height position according to the thickness of the molding die 15 to be clamped by adjusting the clamping nuts 3e and 3f.

Now, the operator first prepares the raw material dough into the lower mold 15a. At this time, the guide rails 13, 13 are in the working position, and the lower mold 15a mounted on the mold carriers 14, 14 is located on the work surface 12a of the workbench 12, as shown by the solid line in FIG. A sufficient working space is secured for the operator to arrange both predetermined raw materials at predetermined positions on the upper surface of the lower die 15a.

When the preparation of the raw material dough is completed in this way, the operator grasps the handle T attached to the front side of the lower mold 15a and pushes it in the direction along the guide rails 13, 13 to move the lower mold 15a onto the mold carrier 14, 1
4, the lower mold 15a is moved until the rear surface of the lower mold 15a comes into contact with the stop plate 10b as shown by the two-dot chain line in FIG.

As mentioned above, by this simple operation, the lower heating plate 10
The mounting of the lower mold 15a onto the upper mold is completed. At this time, the lower mold 15a is positioned in the front-rear direction by the stop plate 10b, and in the left-right direction by the side plates of the carts 14, 14, which are in contact with both left and right sides of the lower hot plate 10, and is positioned on the lower surface of the upper hot plate 11. It directly faces the attached upper mold 15. After pushing the lower mold 15a to the position of the lower hot plate 10, the operator pulls the guide rails 13, 13 toward you,
This is the standby position. With the above, the preparation work for hot vulcanization molding has been completed.Next, the operation of the molding press during hot vulcanization molding will be explained based on the schematic diagrams for explaining the operation in Figures 3 and 4. do.

The operator first operates the main cylinder lever 21 to supply pressurized oil to the advancing side oil chamber of the main cylinder 5. As a result, the plunger ram 5a of the main cylinder 5 advances, and the movable platen 6 moves upward together with the lower hot plate 10 and the lower die 15a placed on its upper surface.
The upper surface of the lower mold 15a is brought into close contact with the lower surface of the upper mold 15b attached to the lower side of the upper hot plate 11, and with a predetermined pressing force from the main cylinder 5, the lower mold 15a and the upper mold 15b are pressed against the lower hot plate. 10 and the upper hot plate 11 (see FIG. 3).

Next, the operator turns on the heater switch 23. As a result, the heaters H, H... of the lower hot plate 10 and the upper hot plate 11 are connected to each other as described above.
The temperature of the lower hot plate 10 and the upper hot plate 11 is maintained at a predetermined value by energization control based on the detection result of the thermocouple attached to the hot plate 1, and the lower mold 15a and the upper mold 15b attached thereto are heated. At the same time as the heater switch 23 is turned on, a vulcanization timer (not shown) built into the operation panel 20 starts counting, and after the timer finishes counting, the heater switch 23 is automatically turned off.

After turning on the heater switch 23, the operator operates the lifting cylinder lever 22 in order to supply pressure oil to the advancing side oil chamber of the chamber lifting cylinder 9. As a result, the piston rod 9a advances and the chamber wall 8 moves upward. At this time, the operator observes this upward movement and observes that the upper part of the chamber wall 8 is connected to the chamber body 40, which is protruded from the lower surface of the upper wall 4. When the upper end is above the O-ring 41,
Returning the lifting cylinder lever 22 to the neutral position,
The advancing operation of the piston rod 9a is stopped. When the lifting cylinder lever 22 is in the neutral position, the oil passages leading to the advancing side oil chamber and the retreating side oil chamber of the chamber lifting cylinder 9 are both closed, and the chamber wall 8 is closed by the above-mentioned operation. teeth,
Its upper part is locked with being fitted to the chamber body 40 via an O-ring 41, and the upper plate 4,
A vacuum chamber VC surrounded by the chamber body 40 and the movable platen 6 is formed (see FIG. 4).

This vacuum chamber VC is airtightly sealed at its upper part with an O-ring 41 and at its lower part with an O-ring 6b. Since it can be formed by a simple procedure of stopping when the upper end is above the O-ring 41, it is completely manual operation by operating the lifting cylinder lever 22 while observing the upward movement of the chamber wall 8. A vacuum chamber VC can be formed by operation. In addition, the molding molds 15 that are clamped between the lower hot plate 10 and the upper hot plate 11 have different dimensions in the thickness direction, and the vertical direction of the movable platen 6 and the upper plate 4 when the molds are clamped is Even if the separation distance is different,
If this separation distance is within the vertical dimension of the chamber wall 8, the vacuum chamber VC can be removed using exactly the same procedure.
can be easily formed.

After forming the vacuum chamber VC in this manner, the operator operates the valve operation switch 24 to open the vacuum valve and evacuate the chamber VC to a predetermined degree of vacuum. Connect the VC to a vacuum source. After the vacuum chamber VC reaches a predetermined degree of vacuum,
The operator operates the main cylinder lever 21 to instantaneously supply pressure oil to the oil chamber on the retraction side of the main cylinder 5, and then returns the lever 21 to the neutral position.
By this operation, the plunger ram 5a of the main cylinder 5 retracts by a minute amount and then stops at that position.
A minute gap is formed between a and the upper die 15b. On the other hand, after the aforementioned heater switch 23 is turned on, the temperature of the lower hot plate 10 and the upper hot plate 11 has been raised and maintained at a temperature suitable for thermal vulcanization, so that the pressure is applied between the two hot plates. Heat vulcanization is progressing inside the molding die 15, and gas is generated from the raw material dough inside the molding die 15. Main cylinder lever 2 mentioned above
Operation 1 is for removing this gas, that is, for bumping, and the generated gas passes through the gap created by this operation and is discharged from the vacuum chamber VC via the intake hole 43 and the intake hose 44. It is removed by being drawn into a vacuum source.

After keeping the main cylinder lever 21 in the neutral position for a predetermined period of time, the operator operates the lever 21 to feed pressure oil to the advancing side oil chamber of the main cylinder 5, and the pressing force of the cylinder 5 causes the operator to , lower mold 15a and upper mold 15
b between the lower hot plate 10 and the upper hot plate 11,
Thereafter, this state is maintained until the vulcanization timer finishes counting.

After bumping is completed, there is no need to maintain vacuum in the vacuum chamber VC, so after operating the main cylinder lever 21 described above, the operator operates the valve operation switch 24 to open the vacuum break valve.
This opens the vacuum chamber VC to the atmosphere,
The pressure inside the chamber VC becomes atmospheric pressure.

Now, after the vulcanization timer has finished counting, the operator moves the main cylinder lever 21 and the lifting cylinder lever 22 in order to supply pressure oil to the oil chambers on the entry and exit sides of the main cylinder 5 and the chamber lifting cylinder 9. Manipulate. As a result, the plunger ram 5a and the piston rod 9a retract to their respective retraction limit positions, and the movable platen 6 and chamber wall 8 are lowered to their lower limit positions, returning to the initial state described in the operation description. Then, the operator pushes the guide rails 13, 13, which were previously set to the standby position, in the direction of the lower hot plate 10 to set this to the working position, and then grasps the handle T to transport the lower mold 15a. Trolley 1
4 and 14 along the rails 13 and 13 to the position of the work surface 12a, and the molded product is taken out from the lower mold 15a on the work surface 12a to complete the series of operations.

Thereafter, by repeating the same operation, molded products can be continuously produced.

In this embodiment, the chamber wall 8 is cylindrical, but it goes without saying that it may also be cylindrical with a cross-sectional shape other than circular, such as rectangular or hexagonal. However, by making the chamber wall 8 cylindrical, it becomes easy to process the inner circumferential surface of the chamber wall 8 and the outer circumferential surfaces of the movable platen 6 and the chamber body 40 that fit therein, and the O-ring 6b and This has the advantage that standard products can be used for the same 41.

〔effect〕

As detailed above, the molding press according to the present invention moves the chamber wall fitted around the outer periphery of the movable plate upward, and fits the upper part of the chamber wall into a part of the upper plate, thereby forming the movable plate. A vacuum chamber is formed by the upper plate and the chamber wall, and even when molding molds of various thicknesses are clamped between the movable plate and the upper plate, the amount of upward movement of the chamber wall is controlled. Since this can be easily accommodated by adjustment, it is possible to perform molding under vacuum even in a molding press for high-mix, low-volume production, thereby reducing the defective rate and improving productivity.

Furthermore, since the vacuum chamber is formed by the simple movement of the chamber wall upward, manual operation is possible.

Furthermore, in the molding press of the present invention, since the movable platen also serves as a part of the vacuum chamber, it is possible to save on materials and to reduce the weight compared to a machine using a bell-shaped vacuum chamber member.

In addition, since the chamber wall and the upper wall have a fitting structure, the O-ring 41, which is a sealing member, does not have to bear the weight of either member, compared to the case where it is sandwiched between metal members in the vertical direction. Therefore, the life can be extended.

Furthermore, since this O-ring 41 contacts the inner circumferential surface of the chamber wall 8 that moves up and down, high precision is not required to control the position at which the chamber wall 8 moves up and stops to form the vacuum chamber VC. In other words, it is sufficient that the upper edge of the chamber wall 8 is above the position of the O-ring 41. As described above, the present invention has various excellent effects.

[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, FIGS. 3 and 4. The figure is a schematic sectional view for explaining the operation, and FIG. 5 is a perspective view of the main parts of a conventional forming press. 1... Base, 2... Lower board, 3... Pillar, 4...
Upper plate, 5... Main cylinder, 6... Movable plate, 8...
Chamber wall, 9... Chamber lifting cylinder, 10
...Lower hot plate, 11...Upper hot plate, 15a...Lower mold,
15b... Upper mold.

Claims (1)

[Scope of Claims] 1. A lower heating plate attached to the upper side of a movable plate that is vertically movable between an upper plate and a lower plate that face each other, and an upper heating plate attached to the lower side of the upper plate. A mold for molding is clamped between the plate and the clamping force applied via the lower hot plate and the upper hot plate is supported by the lower plate and the upper plate, while
In a molding press machine in which the mold is surrounded by a vacuum chamber so that molding can be performed under vacuum, a
When moving upward, its upper part engages with a part of the upper plate,
A molding press machine, characterized in that a cylindrical chamber wall is provided between the movable plate and the upper plate and forms the vacuum chamber together with the movable plate and the upper plate.