JP2536645B2 - Molding machine clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] 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, etc. 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 the movable plate is provided with a main ram that presses the movable plate toward a fixed plate. (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 that presses the movable plate and a fixed plate.

The main ram has a large-diameter portion at the rear end, and a small-diameter portion on the front end side of the rear end.

The large diameter portion 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, and the small diameter portion extends parallel to the column toward the fixed platen. Has been done.

The small diameter 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 projects into the ram insertion hole and abuts against the tip of the main ram, and has a protruding posture that transmits the pressing force of the main ram to the movable plate, and retracts from the ram insertion hole. An engaging member is provided that can assume a retracted posture that allows the menlum to enter the insertion hole.

[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 through the engaging member, and the movable die held by the movable platen is strongly pressed against the fixed die,
The mold is clamped.

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 plate is sufficient to be approximately the same as the stroke amount of the movable plate 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. Therefore, 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 longitudinal sectional views of a vertical mold clamping device of a molding machine according to an embodiment of the present invention, FIG. 3 is a plan view of the same, and FIG. 4 is an operation explanatory view. FIG. 1 is a cross-sectional view of FIG.
2 shows a cross section taken along line I, and FIG. 2 shows a cross section taken along line II-II in FIG. Further, FIG. 4 shows the same vertical section as that shown in FIG.

A fixed board 12 is fixed to the floor 10, and columns 14, 16, 18, and 20 are erected from the fixed board 12. 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 on the upper end of each column 14 to 20, and a nut 26 is attached to this male screw.
Are screwed together. A substantially ring-shaped nut retainer 28 is arranged on the upper side of the nut 26, and the nut retainer 28 is fixed to the cylinder platen 22 with bolts (not shown) so that the cylinder platen 22 is held above the columns 14 to 20. ing.

In addition, the lower surface side of the nut 26 is a step portion 24a of the column insertion hole 24.
When the cylinder platen 22 is pressed upward due to the protrusion of the main ram, which will be described later,
24a is pressed against the nut 26 to prevent the cylinder platen 22 from moving upward.

As shown in FIG. 3, the cylinder platen 22 has a motor 30
Is provided, and the rotational driving force of the motor 30 can be transmitted to the nut 26 via the chain 32. 4 columns
The cylinder platen 22 can be moved up and down by motivating and rotating the four nuts 26 screwed to 14 to 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 at its four corners, and the four columns 14 to 20 are inserted into the respective guide holes 36.

As shown in FIG. 3, a side cylinder 38 is attached to a side surface portion of the cylinder platen 22, and a piston rod (not shown) extending downward from the side cylinder 38 is connected to a side surface portion of the movable platen 34. There is. 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 large-diameter portions 44 and 45, and also has a cylinder hole for making the main rams 40 and 42 stroke in a direction parallel to the columns 14 to 20 (vertical direction).
48 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 packing interposed between the outer peripheral surfaces of 44 and 45 and the inner peripheral surface of the cylinder hole 48 is shown.

The cylinder platen 22 is provided with ram pull-up cylinders 54, 55 for pulling up and operating the main ram 40. Rods 56, 57 of the ram pull-up cylinders 54, 55 are extended downward and the rod 56 , 57 are connected to the large diameter portions 44, 45 at their tips.

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
Spaces 60 and 61 that are set back from the inner peripheral surfaces of the ram insertion holes 58 and 59 are provided in the portion on the 22 side. This space 6
Engagement members 62 and 63 that are movable in the horizontal direction are provided in 0 and 61, and engagement cylinders 64 and 65 are provided on the movable platen 34 to advance and retract the engagement members 62 and 63. ing.

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, 61,
The engaging members 62, 63 and the engaging cylinders 64, 65 are provided in the convex portion 70, respectively. 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 80 is a ratchet safety hook for preventing the movable platen 34 from falling even if the side cylinder 38 is in a malfunction state.

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

As shown in FIG. 4, a mold is provided between the movable platen 34 and the fixed platen 12.
74 is 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 extracting 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
The lowering of 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 moved to the space 60.
It is located slightly above. Therefore, the engagement cylinders 64 and 65 are operated to engage the engagement members 62 and 63 with the ram insertion hole 5
Protrude into 8, 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, 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. 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 ram 40,
The small diameter portions 46, 47 of 41 penetrate into 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.

With this mold clamping device, the main ram 4
0 and 41 are 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, 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 and the engaging members 62 and 63 are provided in the convex portion 70.
Further, the engaging cylinders 64, 65 are provided, and the concave portion 72 is provided on the lower surface of the cylinder platen 22, so that 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 four columns 14 to 20 are provided.
Among them, the center of the main ram 40 is located inside the line connecting the centers of the columns 14 and 16, and 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 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. 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)

(57) [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 the mold clamping device of the molding machine, the main ram has a large-diameter portion at the rear end, and a small-diameter portion on the front end side with respect to the rear end. The large diameter portion is held in a cylinder hole provided inside the cylinder platen so as to be movable by a small stroke in the direction parallel to the column, and the small diameter portion extends parallel to the column toward the fixed plate. The small-diameter portion of the ram is inserted into a ram insertion hole formed in the movable plate in a direction parallel to the column. The ram has a main plate that protrudes into the ram insertion hole at a portion of the ram insertion hole on the cylinder platen side. With ram tip An engaging member is provided which can be brought into contact with the projecting posture for transmitting the pressing force of the main ram to the movable plate and a retracting posture for retreating from the ram insertion hole and allowing the main ram to enter the insertion hole. A mold clamping device for a molding machine, which is characterized in that