JPH0790351B2 - Molding machine clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is for clamping a mold in a resin product injection molding machine, a metal product die casting machine, a compression molding machine, a deep drawing press, a stamping machine, or the like. Of equipment.

[Prior Art] As a mold clamping device of 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 between the fixed platen and the cylinder platen. There is known a structure in which a main ram that presses the movable plate toward a fixed plate is provided. (For example, JP-B-43-29674 and JP-A-47-12434.
No. JP-A-50-20926. A mold is arranged between the movable platen and the fixed platen, and the movable mold of the mold is held on the movable platen. The movable platen is moved back and forth 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 with the fixed mold, the main ram is moved forward, whereby the movable mold is strongly pressed against the fixed mold to perform mold clamping.

[Problems to be Solved by the Invention] In the mold clamping device of the conventional molding machine, even when the movable platen is opened from the fixed mold, the movable platen is moved only by the movable platen moving drive device. There is. However, since the movable mold is in close contact with the fixed mold, a considerably large force is required when separating the two molds. For this reason, the drive device for moving the movable plate has a large capacity.

[Means for Solving the Problems] In the mold clamping device of a molding machine of the present invention, a fixed platen and a cylinder platen are connected by a column, and the fixed platen and the cylinder platen are movable along the column. A movable plate and a main ram for pressing the movable plate toward the fixed plate are provided, and a pressing device dedicated to the mold opening for pressing the movable plate in the mold opening direction when the mold is opened is provided. .

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

The movable plate is moved toward the fixed plate until the movable plate comes into contact with the fixed plate. This movement is performed by, for example, a hydraulic cylinder arranged between the cylinder platen and the movable platen.

When the movable die comes into contact with the fixed die, the main ram is advanced. Then, the main ram moves the movable plate toward the fixed plate, and the movable mold held by the movable plate is strongly pressed against the fixed mold to perform mold clamping.

To perform mold opening, 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 plate drive device are operated to move the movable mold in a direction in which the movable mold separates from the fixed mold.

In this way, when the mold is opened, the movable plate can be strongly pressed by both pressing devices to reliably separate the movable mold from the fixed mold. After the movable die is separated from the fixed die, the movable platen can be moved quickly by the small capacity drive device.

Embodiments Embodiments will be described below with reference to the drawings.

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

A fixed platen 12 is fixed to the floor 10, and the fixed platen 12 is connected to the column.
14, 16, 18 and 20 are erected. A cylinder platen 22 is attached to the upper end of each column 14-20. In this embodiment, four column insertion holes 24 (FIG. 2) are formed at 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. Also, each column 14
A male screw is engraved at the upper end of each of ~ 20, and a nut 26 is screwed to the male screw.

As shown in FIG. 3, the cylinder platen 22 is provided with a motor 30, and the rotational driving force of the motor 30 can be transmitted to the nut 26 via the chain 32. 4 columns 14
The cylinder platen 22 can be moved up and down by synchronously rotating the four nuts 26 that are screwed to the .about.20. (In addition, instead of the chain, the power may be transmitted by a gear or the like. The number of motors may be one or three or more.) The movable platen 34 is arranged between the fixed platen 12 and the cylinder platen 22. ing. The movable plate 34 is provided with guide holes 36 (FIG. 2) at its four corners, and four columns 14 to 20 are inserted into the respective guide holes 36.

As shown in FIGS. 3 and 4, a side cylinder 38 is attached to a side surface portion of the cylinder platen 22, and a piston rod 38 A (not shown) extending downward from the side cylinder 38 is provided on a side surface portion of the movable plate 34. It is connected. The side cylinder 38 moves the movable platen 34 up and down along the columns 14 to 20.

In this mold clamping device, two main rams 40 and 42 are provided. The upper ends of the main rams 40, 42 are circular large-diameter portions 44, 45, and the other major portions are small-diameter portions 46, 47 having a rectangular cross section.

The cylinder platen 22 accommodates and holds the large-diameter portions 44 and 45, and also has a cylinder hole 4 for moving the main rams 40 and 42 in a direction parallel to the columns 14 to 20 (vertical direction).
8 and 49 are drilled. 50 and 51 are the cylinder holes 48 and 49
Is a ring-shaped member that seals the lower part of the.

The cylinder platen 22 is provided with ram lifting cylinders 54, 55 for pulling up and operating the main ram 40.
The tips of rods 56, 57 of the ram lifting cylinders 54, 55 are connected to the large diameter portions 44, 45.

The movable plate 34 is provided with ram insertion holes 58, 59 having a rectangular cross section in which the small diameter portions 46, 47 having a rectangular cross section are inserted in the vertical direction. In the present embodiment, the insertion holes 58 and 59 penetrate the movable plate 34, but they may be concave holes with a bottom.

Of the inner peripheral surfaces of the ram insertion holes 58, 59, the cylinder platen 22
Spaces 60 and 61 are provided in the side portions so as to recede from the inner peripheral surfaces of the ram insertion holes 58 and 59. This space 60,
Within the 61, engaging members 62, 63 that are movable in the horizontal direction are provided, and engaging cylinders 64, 65 are provided on the movable plate 34 for advancing and retracting the engaging members 62, 63. .

As shown in FIG. 2, a convex portion 70 protruding upward is provided on the upper surface portion of the movable plate 34, and the spaces 60 and 61, the engaging members 62 and 63, and the engaging cylinders 64 and 65 are respectively formed. It is provided in the convex portion 70. On the lower surface of the cylinder platen 22, there is provided a recess 72 having a size capable of fitting the projection 70.

Reference numeral 73 is a ratchet safety hook for preventing the movable platen 34 from falling even if the side cylinder 38 is in a malfunction state.

As shown in FIG. 4, a mold 74 is provided between the movable platen 34 and the fixed platen 12.
, The movable mold 76 is held by the movable plate 34, and the fixed mold 78 is
Are held by the fixed platen 12. Although not shown, movable plate
At 34, a drive device is provided for operating the movable die 76 for pushing out the product.

A mold opening pressing device 80 is provided on a side surface portion of the mold clamping device. As shown in FIGS. 1 and 5, this mold opening pressing device 80
Is a guide shaft suspended from the cylinder platen 22.
82, a piston rod 84 fitted onto the guide shaft 82,
The cylinder 86 is fitted with the piston rod 84.

The guide shaft 82 is connected to the safety hook 73. A passage 90 for hydraulic pressure is formed in the guide shaft 82 from the lower end surface to a height midway, and the upper end portion of the passage 90 communicates with an opening 90a on the side peripheral surface of the guide shaft 82.

An upper end of the piston rod 84 is in contact with the lower surface of the movable plate 34, and a lower end of the piston rod 84 is supported by a stopper 92 which is a nut screwed into the guide shaft 82. The lower portion of the piston rod 84 is a piston portion 84a having an enlarged diameter, and the outer peripheral surface of the piston portion 84a slides on the inner peripheral surface of the cylinder 86. A concave portion 94 is provided around the inner peripheral surface of the piston portion 84a so as to be able to overlap with the opening 90a, and the concave portion 94 has a chamber inside the cylinder 86 (a chamber lower than the piston portion 84a) 98 via a passage 96. Is in communication with.

At the lower end of the hydraulic passage 90 of the piston rod 84, the hydraulic pressure source 10
The hydraulic pressure can be supplied from 0 through the hydraulic pipe 102. The hydraulic pipe 104 branched in the middle of the hydraulic pipe 102 is connected to the side cylinder 38.

To perform the mold clamping in the 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 fixed.
Abut 78. The 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 contacts the fixed mold 78, the tip (lower end) of the main ram 40 is positioned slightly above the space 60. Therefore, the engagement cylinders 64, 65 are operated to engage the engagement members 62, 63 with the ram insertion hole 58,
Protrude into 59. Then, the hydraulic pressure is introduced into the cylinder holes 48, 49 to apply the hydraulic pressure to the upper surface side of the large diameter portions 44, 45. Then, the main rams 40 and 41 move downward, and the lower ends of the main rams 40 and 41 press the engaging members 62 and 63. Then, the movable platen 34 is also pressed downward, and the movable mold 76 is fixed.
It is strongly pressed against 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. Then, the ram lifting cylinders 54 and 55 are operated to raise the main rams 40 and 41. Then, the engagement cylinders 64 and 65 are operated to engage the engagement members 62 and 63 with the ram insertion holes.
Evacuate from 58 and 59.

Then, the hydraulic pressure is supplied from the hydraulic pressure source 100 to the mold opening pressing device 80 and the side cylinder 38. The hydraulic pressure toward the pressing device 80 passes through the passage 90, the opening 90a, the recess 94, and the passage 96, and the chamber 9
8 and the piston rod 84 is strongly pressed upward, and the movable die 76 separates from the fixed die 78. Piston rod 84 for the required short distance (eg 40-60 mm)
When the pressure rises, the opening 90a does not overlap the recess 94, and the hydraulic pressure from the hydraulic pressure source 100 is exclusively transmitted to the side cylinder 38.

As a result, the side cylinder 38 pulls up the movable platen 34. As the movable platen 34 rises, the small diameter portions 46, 47 of the main rams 40, 41 enter the ram insertion holes 58, 59. When the movable platen 34 is raised to the upper limit, the state shown in FIG. 1 is restored.

In this mold clamping device, when the mold is opened, the movable plate 34 is first strongly pressed by the mold opening pressing device 80 and the side cylinder 38, so that the movable mold 76 is easily separated from the fixed mold 78.
Once the molds 76, 78 are separated from each other, the movable platen 34 can be quickly raised with only a small pulling force of the small capacity side cylinder 38.

In this embodiment, when the movable platen 34 is raised to some extent,
After that, the hydraulic pressure is exclusively supplied to the side cylinder 38. The hydraulic pressure switching is automatically performed as the movable platen 34 is raised, and the movable platen 34 continuously and smoothly rises.

In this embodiment, the main rams 40 and 41 are inserted into the ram insertion holes 58 and 59, and the movable platen 34 can be raised until the upper surface thereof is extremely close to the lower surface of the cylinder platen 22.
Therefore, the length of columns 14 to 20 can be set to the required minimum (the length of the mold opening stroke of the movable mold 76 or slightly longer), and the height of the mold clamping device is small. It will be enough. Further, the main rams 40 and 41 do not project from the upper surface of the cylinder platen 22, which also makes it possible to reduce the device height.

Particularly in the present embodiment, the convex portion 70 is provided on the upper surface of the movable plate 34, and the spaces 60 and 61, the engaging members 62 and 63, and the engaging cylinders 64 and 65 are provided in the convex portion 70. A concave portion 72 is provided on the lower surface of the platen 22, and the convex portion 70 can be fitted into the concave portion 72. Therefore, this also reduces the height of the device.

In this embodiment, since the two main rams 40 and 41 are provided in parallel, each main ram can have a small diameter and the movable die 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 the main ram 40 is located inside the line connecting the centers of the columns 14 and 16 among the four columns 14 to 20. The center of the main ram 42 is located inside the line connecting the centers of the columns 18 and 20. Therefore, the bending moment applied to the movable platen 34 and the cylinder platen 22 at the time of mold clamping can be reduced.

Further, in this embodiment, the height of the cylinder platen 22 can be adjusted by turning the nut 26.
Therefore, the mold can be clamped by quickly positioning the cylinder platen 22 so that the molds having different heights can reach the optimum height for mold clamping.

In the above embodiment, the mold clamping device is shown as a vertical mold device, but in the present invention, it 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 the 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 is configured to strongly press the movable plate when the mold is opened by the pressing device dedicated to the mold opening, and the mold can be smoothly opened. Also,
Once the mold is opened, the movable platen can be moved thereafter with a small driving force, so that a small-capacity drive device for moving the movable plate is sufficient.

[Brief description of drawings]

1 and 2 are longitudinal sectional views of an apparatus according to an embodiment of the present invention, FIG. 3 is a plan view thereof, and FIG. 4 is an operation explanatory view thereof. FIG. 5 is an enlarged vertical sectional view of a portion V in FIG. 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.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-59-11234 (JP, A) JP-A-57-140143 (JP, A) JP-A-63-197605 (JP, A)

Claims (1)

[Claims] 1. A fixed platen and a cylinder platen are connected by a column, and a movable platen is movable between the fixed platen and the cylinder platen along a column by a drive unit, and the movable platen is fixed. A mold clamping device of a molding machine in which a main ram for pressing against a board is provided, a movable die is held by the movable board, and a fixed die is held by a fixed board. A mold clamping device for a molding machine, wherein a mold opening pressing device for pressing the movable plate in the mold opening direction at the time of opening is provided separately from the movable plate drive device.