JPH0790350B2 - 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, the movable mold of the mold is held against the movable platen, and the main mold is advanced to strongly press the movable mold against the fixed platen. The mold is clamped.

[Problems to be Solved by the Invention] In a mold clamping device of a conventional molding machine, a mechanism for pressing a movable plate projects from a cylinder platen in a direction opposite to a fixed plate. Therefore, when the mold clamping device is a vertical mold clamping device, the height of the device becomes large, and when it is a horizontal mold clamping device, there is a problem that the installation space becomes large.

[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.

A rear end portion of the main ram is held in a cylinder hole provided inside the cylinder platen so as to be movable in a direction parallel to the column by a small stroke, and a front end side thereof extends parallel to the column toward a fixed platen. Has been done. A tip portion of the main ram is inserted into a ram insertion hole formed in the movable plate in a direction parallel to the column.

A portion of the ram insertion hole on the cylinder platen side that protrudes into the ram insertion hole and engages with the tip of the main ram, and has a protruding posture in which the pressing force of the main ram is transmitted to the movable plate and retracts from the ram insertion hole And an engaging member that can assume a retracted position that allows the menlum to enter the insertion hole.

A drive device for advancing and retracting the engaging member is provided on a side surface portion of the movable plate.

[Operation] A mold is arranged between the movable platen and the fixed platen and the movable platen is held by the movable platen.

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 tip of the main ram is located closer to the cylinder platen than the engaging member.

Therefore, the engaging member is projected into the ram insertion hole.
Then, fluid pressure such as hydraulic pressure is supplied to the cylinder hole in the cylinder platen to advance the main ram.

Then, the tip of the main ram hits the engaging member, the movable platen is moved toward the fixed platen via the engaging member, and the movable die held by the movable platen is strongly pressed against the fixed die, and the mold is clamped. Is performed.

Since the movable mold is brought into contact with the fixed mold in advance, powerful mold clamping is performed only by advancing the main ram by a small stroke (for example, several mm or less).

To perform mold opening, the forward pressure applied to the main ram is released and the main ram is retracted. Next, the engaging member is retracted from the ram insertion hole. After that, the movable platen is moved toward the cylinder platen. In this case, the tip of the main ram freely enters the ram insertion hole.

In this way, since the tip side of the main ram is inserted into the ram insertion hole of the movable plate during mold opening, the movable plate can move until it comes close to the cylinder platen.

Therefore, the distance between the cylinder platen and the movable platen is about the same as the stroke amount of the movable platen when the mold is opened, and the length of the apparatus in the column direction is reduced.

Further, the main ram projects only from the cylinder platen toward the fixed platen, and the main ram does not project from the cylinder platen to the side opposite to the fixed platen. Further, since the driving device for the engaging member is provided on the side surface portion of the movable plate, the thickness of the movable plate can be reduced. For these reasons, the length of the device in the column direction is reduced.

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.
The figure is a diagram for explaining the operation. Incidentally, FIG. 1 shows II of FIG.
2 shows a cross section along the line, and FIG. 2 shows a cross section along the line II-II in FIG. Further, FIG. 4 shows the same vertical section as that shown in FIG. 5 to 7 are explanatory views of the drive mechanism of the engaging member.

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 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. A male screw is engraved at the upper end of each column 14 to 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 the 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 38A extending downward from the side cylinder 38 is connected to a side surface portion of the movable plate 34. . This side cylinder
The movable platen 34 is moved up and down along the columns 14 to 20 by the 38.

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,
Inside the 61, there are provided horizontally movable engaging members 62, 63, and engaging cylinders 64, 65 for moving the engaging members 62, 63 forward and backward are provided on the side surface of the movable plate 34 with brackets. 68
Is attached through.

As shown in detail in FIGS. 5 to 7, a rack 70 is fixed to the tip of a piston rod 64a of the engaging cylinder 64, and a pinion 72 meshing with the rack 70 is fixed to a rotary shaft 74. The base ends of crank arms 76 are fixed to both ends of the rotary shaft 74. Reference numeral 78 is a bracket for supporting the rotary shaft 74 on the movable platen 34, and 80 is a bearing.

One end of a crank rod 84 is pivotally attached to the tip end side of the crank arm 76 via a pivot pin 82, and the other end of the crank rod 84 is pivotally attached to the engaging member 62 via a pivot pin 86. ing.

When the piston rod 64a of the engagement cylinder 64 is projected, the engagement member 62 advances and the ram insertion hole 58 is opened.
When the piston rod 64a is retracted, the engagement member 62 closes the ram insertion hole 58 as shown in FIGS.

Although not shown in detail, the mechanism for advancing and retracting the engaging member 63 has the same structure as the advancing and retracting mechanism for the engaging member 62, and the same members are designated by the same reference numerals in FIGS.

Reference numeral 90 in FIG. 3 is a ratchet safety hook for preventing the movable platen 34 from dropping even if the side cylinder 38 is in a malfunctioning state.

Next, the operation of the mold clamping device thus configured will be described.

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

To perform the mold clamping, as shown in FIG. 4, the movable platen 34 is lowered to bring the movable mold 76 into contact with the fixed mold 78. This movable plate 34
Is lowered 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. After that, pressure is introduced into the cylinder holes 48, 49 to apply hydraulic pressure to the upper surfaces 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.

After that, the side cylinder 38 is operated to pull up the movable platen 34. As the movable platen 34 rises, the main rams 40, 41
The small-diameter portions 46 and 47 of the above-mentioned penetrate into the ram insertion holes 58 and 59. Eventually, after the state shown in FIG. 1, the movable platen 34 becomes the cylinder platen.
It rises until it almost touches 22.

In this mold clamping device, the main ram 40,
41 is inserted into the ram insertion holes 58 and 59, and the movable platen 34 can be raised until its upper surface 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,
This also makes it possible to reduce the height of the device.

Particularly in this embodiment, the spaces 60, 6 are provided in the movable platen 34.
1. The engaging members 62 and 63 are provided, and the engaging cylinders 64 and 65 are provided on the side surface of the movable platen 34. 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.

[Effect] As described above, the mold clamping device of the present invention can reduce the device size in the longitudinal direction of the column. Therefore, when the mold clamping device is used as a vertical device, the height of the device becomes small, and the device can be installed even if the height of the building is small. Also, since the overall height can be reduced, the movable plate can be made thicker than the conventional one and can be made solid as a whole. Further, when the device of the present invention is used as a horizontal mold clamping device, the installation floor area of the device can be reduced.

[Brief description of drawings]

1 and 2 are vertical cross-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. 5 is a plan view showing the engaging member and its operating mechanism, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII in FIG. 12 …… Fixed plate, 14, 16, 18, 20 …… Column, 22 …… Cylinder platen, 34 …… Movable plate, 40,42 …… Main ram, 44,45 …… Large diameter part, 46,48… … Small diameter part, 58, 59 …… Ram insertion hole, 62, 63 …… Engagement member,

Claims (1)

[Claims] 1. A fixed platen and a cylinder platen are connected by a column, a movable platen movable along the column between the fixed platen and the cylinder platen, and the movable platen is pressed toward the fixed platen. In a mold clamping device of a molding machine provided with a main ram, the rear end of the main ram is held in a cylinder hole provided inside the cylinder platen so as to be movable by a small stroke in a direction parallel to the column. The front end side of the main ram extends toward the fixed plate in parallel with the column, and the front end part of the main ram is inserted into a ram insertion hole formed in the movable plate in a direction parallel to the column. At the portion of the ram insertion hole on the cylinder platen side, the ram is inserted into the ram insertion hole and engages with the tip of the main ram to transmit the pressing force of the main ram to the movable plate. An engaging member is provided which can be retracted from the hole and has a retracted posture that allows the main ram to enter the insertion hole, and a drive device for advancing and retracting the engaging member is provided on a side surface portion of the movable plate. A mold clamping device for a molding machine, which is provided.