JPH0459163A - Molding machine mold clamping device - Google Patents

Abstract

PURPOSE:To powerfully push a movable plate and to smoothly execute die- opening by separately arranging pushing device for die-opening by pushing the movable plate to die-opening direction from movable plate driving device at the time of die-opening for separating a movable die held to the movable plate from a fixed die held to the fixed plate. CONSTITUTION:The movable die is held to the movable plate 34 at between the movable plate 34 and the fixed plate 12 and the movable plate 34 is shifted toward the fixed plate 12 until the movable plate 54 abuts on the fixed die. This shifting is executed with a hydraulic cylinder 38 set at between a cylinder platen 22 and the movable plate 34. When the movable plate 34 abuts on the fixed die, main rams 40, 42 are advanced. Then, the main rams 40, 42 shift the movable plate 34 toward the fixed plate 12, and the movable die held to the movable plate 34 is powerfully pushed to the fixed die and die clamping is executed. In order to execute the die-opening, after retreating the main rams 40, 42, by working a pushing device 80 for die-opening, the movable die is shifted to the direction separating the movable die from the fixed die.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is for clamping molds in injection molding machines for resin products, die casting machines for metal products, compression molding machines, deep drawing presses, stamping machines, etc. Regarding the device.

[Prior Art] As a mold clamping device for this type of molding machine, a fixed platen and a cylinder platen are connected by a column, and a movable platen that is movable along the column is provided between the fixed platen and the cylinder platen. It is known that the movable platen is provided with a main ram that presses the movable platen toward the fixed platen.

(For example, Japanese Patent Publication No. 43-29674, Japanese Patent Publication No. 47-1
No. 2434, JP-A-50-20926, etc. ) A mold is placed between the movable platen and the fixed platen, and the movable mold of the mold is held relative to the movable platen.

The movable platen is moved forward and backward by a drive device such as a hydraulic cylinder installed between the cylinder platen and the movable platen.

After moving the movable plate so that the movable mold overlaps the fixed mold,
By moving the main ram forward, the movable mold is strongly pressed against the fixed mold, and the mold is clamped.

[Problems to be Solved by the Invention] In the mold clamping device of a conventional molding machine, even when opening the mold to separate the movable platen from the fixed mold, the movable platen is moved only by the above-mentioned movable platen radial drive device. There is. However, since the movable mold is in close contact with the fixed mold, a considerably large force is required to separate the two molds. For this reason, the above-mentioned movable platen radial drive device has an unnecessarily large capacity.

[Means for Solving the Problems] In the mold clamping device of the molding machine of the present invention, a fixed platen and a cylinder platen are connected by a column, and are movable along the column between the fixed platen and the cylinder platen. A mold that is equipped with a movable platen and a main ram that presses the movable platen toward a fixed platen, and is equipped with a pressing device exclusively for mold opening that presses the movable platen in the mold opening direction when opening the mold. .

[Function] In the molding machine according to the present invention, a mold is arranged between a movable platen and a fixed platen, and the movable mold is held by the movable platen.

The movable platen is moved toward the fixed platen until the movable mold abuts the fixed mold. This movement is performed, for example, by a hydraulic cylinder disposed between the cylinder platen and the movable platen.

When the movable mold comes into contact with the fixed mold, the main ram is advanced. Then, the main ram moves the movable platen toward the fixed platen, strongly presses the movable mold held by the movable platen against the fixed mold, and clamps the mold.

To open the mold, the forward pressure applied to the main ram is released and the main ram is retracted. Next, the mold opening pressing device and the movable platen driving device are operated to move the movable mold in a direction in which the movable mold is separated from the fixed mold.

In this manner, when opening the mold, the movable platen is strongly pressed by both pressing devices, and the movable mold can be reliably separated from the fixed mold. After the movable mold is separated from the fixed mold, the movable platen can be quickly moved to 8a by a small-capacity drive device.

[Example] Examples will be described below with reference to the drawings.

1 and 2 are longitudinal sectional views of a vertical mold clamping device of a molding machine according to an embodiment of the present invention, and FIG. 3 is a plan view of the same;
FIG. 4 is an explanatory diagram of the operation, and FIG. 5 is a longitudinal sectional view of the V section in FIG. 1. Note that FIG. 1 shows a cross section taken along line 1-1 in FIG. 3, and FIG. 2 shows a cross section taken along line II-II in FIG. 3. Further, FIG. 4 shows the same longitudinal section as that shown in FIG. 1.

A fixed platen 12 is fixed to the floor 10, and columns 14, 16, 18.2o are erected from the fixed platen 12. A cylinder platen 22 is attached to the upper end of each column 14-2o. In this embodiment, four column insertion holes z4 (see FIG. 2) are formed in the four corners of the cylinder platen 22, and the upper ends of the columns 14 to 20 are inserted into the column insertion holes 24. Further, a male screw is cut into the upper end of each column 14 to 2o, and a nut 26 is screwed into this male screw.

As shown in FIG. 3, the cylinder platen 22 is equipped with a motor 3.
0 is provided, and the rotational driving force of this motor 30 can be transmitted to the nut 26 via the chain 32. By synchronously rotating the four nuts 26 screwed into the four columns 14 to 20, the cylinder platen 22
can be moved up and down. (Instead of a chain, the power may be transmitted by gears or the like. Also, the number of motors may be one or three or more.) A movable platen 34 is arranged between the fixed platen 12 and the cylinder platen 22. ing. The movable platen 34 has guide holes 36 (FIG. 2) formed at its four corners, and the four columns 14 to 20 are inserted through each guide hole 36, respectively.

As shown in FIG. 3.4, a side cylinder 38 is attached to the side surface of the cylinder platen 22, and a piston rod 38 extends downward from the side cylinder 38.
A (path shown) is connected to a side surface portion of the movable platen 34. This side cylinder 38 moves the movable platen 34 to the column 1.
4 to 20.

This mold clamping device is provided with two main rams 40,42. The upper ends of the main rams 4o, 42 are circular large-diameter parts 44.45, and most of the other parts are small-diameter parts 46.47 with a rectangular cross section.

The cylinder platen 22 accommodates and holds the large diameter portions 44 and 45, and also connects the main rams 4o and 42 to the column 14.
Cylinder holes 48 and 49 for stroke in the parallel direction (vertical direction) to 20 are bored. 50.51
is a ring-shaped member that closes the lower part of the cylinder hole 48,49.

The cylinder platen 22 is provided with a ram lifting cylinder 54.55 for raising the main ram 40, and a rod 56.55 of the ram lifting cylinder 54.55.
The tip of 57 is connected to the large diameter portion 44.45.

The movable platen 34 is vertically bored with a ram insertion hole 58.59 having a rectangular cross section into which a small diameter portion 46.47 having a rectangular cross section is inserted. Although the insertion holes 58 and 59 pass through the movable platen 34 in this embodiment, they may be in the shape of a concave hole with a bottom.

A space 60.61 that recedes from the inner circumferential surface of the ram insertion hole 58.59 is provided in a portion of the inner circumferential surface of the ram insertion hole 58.59 on the cylinder platen 22 side. In this space 60.61 a horizontally movable retaining member 62.63 is provided, the engagement member 62.
Locking cylinders 64 and 65 are provided on the movable platen 34 to move the cylinders 63 forward and backward.

As shown in FIG. 2, a convex portion 70 projecting upward is provided on the upper surface of the movable plate 34, and the space 60.
61, engagement member 62.63, engagement cylinder 64.65
are provided within this convex portion 70, respectively. The lower surface of the cylinder platen 22 is provided with a recess 2 having a size that allows the projection 70 to fit therein.

A ratchet safety hook 73 is provided to prevent the movable platen 34 from falling even if the side cylinder 38 malfunctions.

As shown in FIG. 4, a mold 74 is arranged between the movable platen 34 and the fixed platen 12, a movable mold 76 is held by the movable platen 34, and a fixed mold 78 is held by the fixed platen 12. Although not shown, the movable platen 34 is provided with a drive device for operating the product extrusion device of the movable mold 76.

A mold opening pressing device 80 is provided on the side surface of this mold clamping device. As shown in FIGS. 1 and 5, this mold opening pressing device 80 includes a guide shaft 82 hanging vertically from the cylinder platen 22, a piston rod 84 fitted externally to the guide shaft 82, and a piston rod 84 fitted internally to the guide shaft 82. A cylinder 86 is provided.

Guide shaft 82 is connected to safety hook 73. A hydraulic passage 90 is bored through the guide shaft 82 from the lower end surface to a midway height, and the upper end portion of the passage 90 communicates with an opening 90a in the side circumferential surface of the guide shaft 82.

The piston rod 84 has its upper end in contact with the lower surface of the movable platen 34, and its lower end is supported by a stopper 92 made of a nut screwed onto the guide shaft 82. The lower part of the piston rod 84 is a piston part 84a with an enlarged diameter, and the outer peripheral surface of the piston part 84a is connected to the cylinder 86.
slides on the inner peripheral surface of the On the inner circumferential surface of the piston portion 84a,
A recess 94 is provided around the opening 90a so as to overlap with the opening 90a, and the recess 94 communicates with a chamber 98 in the cylinder 86 (a chamber below the piston portion 84a) via a passage 96.

Hydraulic pressure can be supplied to the lower end of the hydraulic passage 90 of the piston rod 84 from a hydraulic power source 100 via a hydraulic piping 102. A hydraulic pipe 104 branched in the middle of this hydraulic pipe 102 is connected to the side cylinder 38.

In order to perform mold clamping in a mold clamping device having such a configuration, the fourth
As shown in the figure, the movable platen 34 is lowered and the movable mold 76 is brought into contact with the fixed mold 78. This lowering of the movable platen 34 is performed by the stroke of the side cylinder 38.

When the movable platen 34 is lowered until the movable mold 76 comes into contact with the fixed mold 78, the tip (lower end) of the main ram 40 will be located slightly above the space 60. Therefore, the engagement cylinders 64.65 are operated, and the engagement members 62.6
3 into the ram insertion hole 58,59. After that,
Hydraulic pressure is introduced into the cylinder holes 48, 49, and the large diameter portion 44.
Apply hydraulic pressure to the top side of 45. Then, the main rams 40.41 move downward, and the lower end of each main ram 40.41 presses the engagement member 62.63. Then, the movable platen 34 is also pressed downward, the movable mold 76 is strongly pressed against the fixed mold 78, and the mold is clamped.

When opening the mold, the hydraulic pressure applied to the cylinder holes 48 and 49 is first released in the state shown in FIG. Thereafter, the ram bow cylinder 54.55 is operated to raise the main ram 40.41. Then,
The engagement cylinders 64, 65 are actuated, and the engagement members 62.
63 is retracted from the ram insertion hole 58,59.

After that, hydraulic pressure is applied from the hydraulic source 100 to the mold opening pressing device 8.
0 and side cylinder 38.

The hydraulic pressure toward this pressing device 80 is transmitted through a passage 90 and an opening 90a.
, through the recess 94 and the passage 96 into the chamber 98, thereby forcefully pressing the piston rod 84 upward;
The movable mold 76 is separated from the fixed mold 78. required short distance l
11 (for example, 40 to 60 mm) of the piston rod 84
, the opening 90a no longer overlaps the recess 94, and the hydraulic pressure from the hydraulic source 100 is exclusively applied to the side cylinder 3.
8.

As a result, the side cylinder 38 pulls up the movable platen 34. As the movable platen 34 rises, the main ram 40.4
The small diameter section 46.47 of 1 enters into the ram insertion hole 58.59. When the movable platen 34 is raised to its upper limit, the state shown in FIG. 1 is restored.

In this mold clamping device, when the mold is opened, the movable platen 34 is first strongly pressed by the mold opening pressing device 80 and the sight cylinder 38, so that the movable mold 76 easily separates from the fixed mold 78. Type 76. Once 78 comrades defect,
After that, the movable platen 34 can be quickly raised using only the small lifting blade of the small capacity side cylinder 38.

In this embodiment, once the movable platen 34 has risen to a certain extent, hydraulic pressure is supplied exclusively to the side cylinders 38 after that. This hydraulic pressure switching is automatically performed as the movable platen 34 rises, and the movable platen 34 rises continuously and smoothly.

In this embodiment, the main rams 4o and 41 are inserted into the ram insertion holes 58 and 59, and the movable I! 34 can be raised until its upper surface is in close proximity to the lower surface of cylinder platen 22. Therefore, the length of the columns 14 to 20 can be set to the minimum required length (the mold opening stroke length of the movable mold 76 or a length slightly larger than that),
The height of the mold clamping device can be made small. Furthermore, the main rams 40, 41 do not protrude from the upper surface of the cylinder platen 22, which also allows the height of the apparatus to be reduced.

In particular, in this embodiment, the convex portion 70 is provided on the upper surface of the movable plate 34.
A space 60.61, an engaging member 62.63, and an engaging cylinder 64.65 are provided in the convex portion 70, and a recess 72 is provided on the lower surface of the cylinder platen 22,
The convex portion 7o can be fitted into the four portions 72. Therefore,
This also allows the height of the device to be further reduced.

In this embodiment, since the main rams 4o and 41 are provided in two oblique parallel configurations, each main ram can be made small in diameter.
Moreover, the movable mold can be pressed uniformly.

Further, as shown in FIG. 3, columns are provided at the four corners of the fixed platen 12 and the cylinder platen 22, and four columns 14
20, the center of the main ram 4o is located inside the line connecting the centers of columns 14, 16, and columns 18.
The center of the main ram 42 is located inside the line connecting the centers of 2o. Therefore, the bending moment applied to the movable platen 34 and the cylinder platen 22 during mold clamping can be reduced.

Furthermore, in this embodiment, the height of the cylinder platen 22 can be adjusted by turning the nut 26. Therefore, even for molds of different heights, the cylinder platen 22 can be quickly positioned to the optimum height for mold clamping.

Although the mold clamping device is shown as a vertical device in the above embodiment, the present invention can also be implemented as a horizontal mold clamping device in which the columns 14 to 20 are arranged horizontally. When the present invention is used as a horizontal mold clamping device in this way,
The installation space for the mold clamping device can be reduced.

[Effects] As described above, the mold clamping device of the present invention uses a pressing device exclusively for mold opening to forcefully press the movable platen at the time of mold opening, and can smoothly open the mold. Also,
- Once the mold is opened, the movable platen can be moved with a small driving force, so a small capacity drive device for moving the movable platen is sufficient.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views of the apparatus according to the embodiment of the present invention, FIG. 3 is a plan view thereof, and FIG. 4 is an explanatory diagram of the same operation. FIG. 5 is an enlarged vertical cross-sectional view of the V section in FIG. 1. 12... Fixed plate, 14.16.18.20... Column, 22... Cylinder platen, 34... Movable plate, 80... Pressing device for mold opening, 84... Piston rod , 86... cylinder. Patent Applicant Ube Industries Co., Ltd. Agent Patent Attorney Tsuyoshi Shigeno Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 12: Cylinder ladle Fig. 5 Stone rod part Frinzo / Site No Link Surprising 92ml

Claims (1)

[Claims] A fixed platen and a cylinder platen are connected by a column, and a movable platen is movable along the column by a drive device between the fixed platen and the cylinder platen, and the movable platen is connected by a column. In a mold clamping device of a molding machine, which is provided with a main ram that presses toward a fixed plate, a movable mold is held on the movable plate, and a fixed mold is held on the fixed plate, the movable mold is separated from the fixed mold. A mold clamping device for a molding machine, characterized in that a mold opening pressing device for pressing the movable platen in the mold opening direction when opening the mold is provided separately from the movable platen driving device.