JP5905331B2 - Mold mounting machine for injection molding machine - Google Patents

Description

  The present invention relates to a mold mounting board of an injection molding machine, and more particularly to a structure for adjusting the rigidity of a mold mounting board by screwing a screw into a screw hole provided on a portion other than the mold mounting surface. The mold mounting plate refers to the fixed platen 1 and the movable platen 3.

  As shown in FIG. 7, the mold clamping mechanism portion provided in the injection molding machine is such that the fixed platen 1 and the rear platen 2 are connected by a plurality of tie bars 4, and the movable platen 3 slides along the plurality of tie bars 4. The fixed platen 1 is configured to advance and retreat. A fixed mold 5 a is attached to the fixed platen 1, and a movable mold 5 b is attached to the movable platen 3. The movable platen 3 moves forward and backward with respect to the fixed platen 1 by a link mechanism 6 that expands and contracts by driving of the servomotor 7, and performs mold clamping and mold opening operations of the mold 5. In the mold clamping mechanism as shown in FIG. 7, in order to increase the rigidity of the fixed platen 1 and the movable platen 3 itself of the mold clamping mechanism, the thickness of the casting forming the fixed platen 1 and the movable platen 3 is increased. . In particular, in the stationary platen 1, since the nozzle enters from the injection side 8, a large bowl-shaped casting is provided on the surface opposite to the surface on which the stationary mold 5a is attached.

  In many cases, the mold 5 (fixed side mold 5a) is mounted around the nozzle (not shown) of the injection cylinder, and in the case of the fixed platen 1 shown in FIGS. 8 and 9, a mold clamping force is generated. At this time, the fixed platen 1 and the movable platen 3 are deformed as shown in FIG. In order to eliminate the variation, as shown in FIG. 11, the vicinity of the center portion of the fixed platen 1 is overlaid and reinforced (refer to the central portion reinforcement portion 12), and the portion away from the central portion (see the cast portion 14) is Often cast out. This is to make the deformation of the fixed platen 1 uniform. Reference numeral 10 denotes a nozzle entry location (locating ring) into which a nozzle (not shown) of the injection cylinder enters. Reference numeral 16 denotes a through hole through which the tie bar 4 is inserted.

  In Patent Document 1, without increasing the rigidity of the stationary platen and the movable platen, the deformation of the cavity shape is prevented by preventing bending deformation of the fixed side die attached to the fixed platen and the movable side die attached to the movable platen. Techniques for preventing are disclosed. Patent Document 2 discloses a technique that can arbitrarily and easily change the distribution of clamping pressure generated in a mold that has been clamped.

Japanese Utility Model Publication No. 7-3520 JP 2011-189575 A

There are various mold shapes of the mold 5 (fixed side mold 5a, movable side mold 5b), such as small, large, and vertically long as shown in FIG. Further, the fixed platen 1 is often fixed on the lower surface to a machine base (not shown) of the injection molding machine, and the upper and lower mold clamping pressure distributions due to the fixed platen 1 and the movable platen 3 during mold clamping. Bias may occur. For this reason, when performing high-precision molding, the thickness of the mold itself is increased or a reinforcing plate is attached to the mold mounting surface so as not to be affected by deformation of the mold mounting board.
The problem with increasing the thickness of the mold or attaching a reinforcing plate to the mold mounting surface is that the mold thickness that can be mounted on the fixed platen 1 or the movable platen 3 is reduced, and the mold shape is infinite. In the case of high-precision molding, it is necessary to prepare a reinforcing plate that matches the mold. In addition, the technique disclosed in Patent Document 1 is provided with a mold force transmission portion on the mold mounting surface side, and the technique disclosed in Patent Document 2 is changed to a place other than the mold mounting surface. A member such as a core tool is attached, and the attachment thickness is easily adjusted, and there is a problem that the in-mold parallelism changes.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a mold mounting plate for an injection molding machine that can change the rigidity of the mold mounting plate in accordance with the mold size.

The present invention provides a plurality of non-penetrating screw holes on the surface other than the mold mounting surface, and closes the screw holes by tightening screws or attaching additionals to change the rigidity of the fixed platen or movable platen. To do. As a result, according to the present invention, the mold clamping mechanism can adjust the rigidity of the mold mounting plate according to the size of the mold.
The invention according to claim 1 of the present application is a mold mounting board of an injection molding machine that is provided in a mold clamping mechanism of an injection molding machine and holds a mold, except for a mounting surface for mounting the mold on the mold mounting board. A mold mounting plate for an injection molding machine, wherein a plurality of screw holes are provided on at least one surface of the mold, and a screw is screwed into at least one of the plurality of screw holes to adjust the rigidity of the mold mounting plate. It is.
The invention according to claim 2 is characterized in that a screw hole into which a screw of the plurality of screw holes is screwed is changed according to the mold. It is a mold mounting board. The invention according to claim 3 is characterized in that the screwing amount of a screw screwed into the plurality of screw holes is changed according to the mold, The injection according to any one of claims 1 and 2 This is a mold mounting plate of a molding machine.
The invention according to claim 4 is the injection molding according to any one of claims 1 to 3, wherein a reinforcing member is engaged with the screw hole provided in the mold mounting plate and the screw. This is the mold mounting board of the machine.
The invention according to claim 5 is the injection molding machine according to claim 4, wherein the mold mounting plate is a fixed plate, and an annular reinforcing member is engaged with a central portion of the fixed plate. It is a mold mounting board.

  According to the present invention, it is possible to provide a mold mounting plate for an injection molding machine that can change the rigidity of the mold mounting plate in accordance with the mold size.

It is a figure explaining embodiment which provided the screw hole in the fixed board. It is a figure which simplifies and demonstrates FIG. It is a figure explaining the mold clamping mechanism part provided with the stationary platen shown by FIG. It is a figure explaining the state which tightened the plug (set screw) in FIG. It is a figure explaining the state which loosened the embedding plug (set screw) in FIG. It is a figure explaining embodiment using the combination of a volt | bolt and a nut instead of the embedding | plugging (set screw) shown by FIG. 3, FIG. It is a figure explaining the mold clamping mechanism part of an injection molding machine. It is a figure explaining the conventional fixed platen without casting. It is a figure explaining the conventional fixed platen with casting. It is a figure explaining the state which the metal mold mounting board deform | transformed at the time of mold clamping. It is a figure explaining the conventional stationary plate | board which reinforced the center part with casting. It is a figure explaining the state which mounted the vertically long metal mold | die on the metal mold mounting board.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is demonstrated about the same structure as a prior art, or a similar structure.
The present invention provides a mold mounting plate of an injection molding machine that is provided in a mold clamping mechanism of an injection molding machine and holds the mold, and at least one surface other than the mounting surface to which the mold is mounted on the mold mounting plate. A plurality of screw holes are provided in the mold, and the rigidity of the mold mounting board is adjusted by screwing the screws into the screw holes.

Hereinafter, the fixed platen 1 will be described as an example in the description of the embodiment of the present invention. In the movable platen 3, the die mounting plate rigidity can be adjusted in the same manner as the fixed platen 1.
FIG. 1 is a diagram illustrating an embodiment in which screw holes are provided in a fixed platen. As shown in FIG. 1, the fixed platen 1 is provided with through holes 16 for inserting the tie bars 4 at four corners, and the nozzle entrance of the injection cylinder excluding the surface to which the fixed mold 5a is attached and the lower surface. A plurality of screw holes 18 are provided on the surface (locating ring) 10 side, the right and left side surfaces, and the upper side surface. The screw hole 18 is not a through hole but a bottomed screw hole having an appropriate depth. By providing a plurality of screw holes 18 in the fixed platen 1 and screwing a plug (set screw) 20 into the screw hole 18, the rigidity of the fixed platen 1 can be adjusted. The screw holes 18 do not have to be provided on a plurality of surfaces of the fixed platen 1 and may be provided on any of the above surfaces. FIG. 2 is a diagram illustrating a simplified description by reducing the number of screw holes 18 shown in FIG. Thus, in order to adjust the rigidity of the mold mounting plate, the number of screw holes 18 provided in the fixed platen 1 can be selected as appropriate.

  FIG. 3 is a view for explaining a mold clamping mechanism portion provided with the fixed platen shown in FIG. The fixed platen 1 and the rear platen 2 (see FIG. 7) are connected by a plurality of tie bars 4, and the movable platen 3 slides along the plurality of tie bars 4 so as to be movable forward and backward. A fixed mold 5 a is attached to the fixed platen 1, and a movable mold 5 b is attached to the movable platen 3. The fixed platen 1 and the movable platen 3 are provided with a plurality of screw holes 18 for adjusting the rigidity. The screw hole 18 may be provided only in the fixed platen 1 or only in the movable platen 3.

  FIG. 4 is a view for explaining a state in which the plug (set screw) in FIG. 3 is tightened. A plug (set screw) 20 is screwed into a screw hole 18 provided in the fixed platen 1 and the movable platen 3. It is desirable to apply an anti-loosening agent to the plug (set screw) 20 so that the plug (set screw) 20 does not loosen during the injection molding operation by the injection molding machine. In addition, it is not necessary to screw the plug (set screw) 20 into all the screw holes 18 provided in the fixed platen 1 or the movable platen 3, and the plug (set) is set so as to obtain the desired mold mounting plate rigidity. Screw 20 may be screwed in. The rigidity of the mold mounting board is determined not only by the number of plugs (set screws) 20 to be screwed into the screw holes 18 and the positions of the screw holes 18 to be screwed, but also by the screwing amount of the plugs (set screws) into the screw holes 18. It also changes depending on. The screwing amount is the rigidity of the fixed platen 1 and the movable platen 3 depending on where the plug (set screw) 20 is screwed from the bottom of the screw hole 18 when the plug (set screw) 20 is screwed into the screw hole 18. Changes. Further, in order to increase the rigidity of the central portion where the nozzle of the injection cylinder of the stationary platen 1 enters, an annular recess is provided in the central portion of the stationary platen 1 and the spacer 22 is fixed to the stationary platen 1 using a bolt. Good.

  FIG. 5 is a view for explaining a state in which the plug (set screw) in FIG. 4 is loosened. As shown in FIG. 5, the embedding (set screw) 20 screwed into the screw hole 18 provided in the fixed platen 1 or the movable platen 3 can easily adjust the screwing amount. As a result, the rigidity of the fixed platen 1 and the movable platen 3 can be adjusted according to the type of molds attached to the mold mounting surfaces of the fixed platen 1 and the movable platen 3.

  FIG. 6 is a view for explaining an embodiment using a combination of bolts and nuts in place of the plugs (set screws) shown in FIGS. A bolt 24 is screwed into a screw hole 18 provided in the fixed platen 1 or the movable platen 3. The rigidity of the mold mounting board can be adjusted by the screwing amount of the bolt 24 into the screw hole 18 and the number of screws. It is desirable to screw the bolt 24 into the screw hole 18 via a nut 26 for preventing the bolt 24 from loosening. In addition, you may make it adjust the rigidity of the stationary platen 1 by fixing a reinforcement member with the some plug 20 screwed together by the some screw hole 18 which adjoins.

1 Fixed platen (die mounting plate)
2 Rear platen 3 Movable platen (die mounting plate)
4 Tie bar 5 Mold 5a Fixed mold 5b Movable mold 6 Link mechanism 7 Servo motor

DESCRIPTION OF SYMBOLS 10 Nozzle entrance location 12 Center part reinforcement location 14 Casting location 16 Through-hole 18 Screw hole 20 Embedding plug 22 Spacer 24 Bolt 26 Nut

Claims (5)

In the mold mounting plate of the injection molding machine that is provided in the mold clamping mechanism of the injection molding machine and holds the mold,
Providing a plurality of screw holes on at least one surface other than the mounting surface for mounting the mold on the mold mounting board;
A mold mounting plate for an injection molding machine, wherein a screw is screwed into at least one of the plurality of screw holes to adjust the rigidity of the mold mounting plate.   2. The mold mounting plate for an injection molding machine according to claim 1, wherein a screw hole into which a screw is screwed is changed in accordance with the mold.   3. The mold mounting plate for an injection molding machine according to claim 1, wherein a screwing amount of a screw that is screwed into the plurality of screw holes is changed according to the mold.   The mold mounting plate for an injection molding machine according to any one of claims 1 to 3, wherein a reinforcing member is engaged with the screw hole and the screw provided in the mold mounting plate.   5. The mold mounting plate for an injection molding machine according to claim 4, wherein the mold mounting plate is a fixed plate, and an annular reinforcing member is engaged with a central portion of the fixed plate.