JPH07285155A - Side opening mold clamping device - Google Patents

Abstract

PURPOSE:To enable a mold to be easily exchanged by composing a transfer die plate freely rotatively by centering a vertical axis. CONSTITUTION:A fixed die plate 2 holding a fixed mold is secured to a supporting frame 1. Further, a transfer die plate 4 is freely rotatively fitted to a vertical axis 10 provided to the support frame. A clamping cylinder 19 moving forward and backward a die holder 5 is provided to the transfer die plate. Further, a mold opening and closing cylinder capable of revolving the transfer die plate 4 by centering the vertical axis 10 is provided between the transfer die plate 4 and the fixed die plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lateral opening mold clamping device applied to an injection molding machine, a press machine or the like.

[0002]

2. Description of the Related Art An example of a conventional mold clamping device will be described with reference to FIGS. 6 and 7. FIG. 6 is a plan sectional view of the mold clamping device.
FIG. 4 is a left side view of the mold clamping device. In the figure, reference numeral 50 denotes a support frame, and a fixed die plate 54 to which a fixed mold 52 is attached is fixed to one end of the support frame 50, and the fixed die plate 54 is attached to the other end of the support frame 50.
Moving die plate 5 with moving die 56 attached opposite to
8 is slidably mounted. The fixed die plate 54 includes a plurality of (four in this example) hydraulic cylinders 60.
The tie bars 64 extend in the direction of the moving die plate 58 from the surfaces of the internal pistons 62 of the hydraulic cylinders 60 on the moving die plate 58 side. Further, a boost cylinder 66 is fixed to one side of the fixed die plate 54, and a tip portion of a rod 70 connected to an internal piston 68 of the boost cylinder 66 is appropriately fixed to one side of the moving die plate 58. There is. Further, a threaded portion 72 is formed in a part of the tie bar 64, and the moving die plate 58 having an insertion hole 74 through which the tie bar 64 is inserted is provided on the side opposite to the surface on which the moving die 56 is attached. A half nut 76 that meshes with the threaded portion 72 of the tie bar 64 is provided so as to be movable in a direction substantially perpendicular to the axis of the insertion hole 74.

The tip of the tie bar 64 is a movable die plate 5
The size of the tie bar 64 is set to be slightly separated from the insertion hole 74 of the movable die plate 58 in the mold open state of 8, and the stop ring 78 is provided on a part of the tie bar 64 so that the position can be adjusted. In this case, in order to smoothly align the insertion hole 74 of the moving die plate 58 and the tie bar 64, the insertion hole 74
The opening edge is formed in a tapered shape. Also tie bar 6
In the standby state of 4, the stop ring 78 provided on the tie bar 64 is inserted into the insertion hole 74 of the movable die plate 58 immediately before the fixed die 52 and the movable die 56 complete the mold closing in the standby state of the movable die plate 58. Of the tie bar 64 and the half nut 76 provided on the moving die plate 58 are positioned so as to be engaged with each other.

In such a mold clamping device, by supplying pressure oil to one oil chamber 84 of the boost cylinder 66 when the mold is closed, the movable die plate 58 is moved to the fixed die plate 54 side, and the fixed die 52. Immediately before the mold closing of the moving die 56 and the moving die 56 is completed, the stop ring 78 provided on the tie bar 64 engages with the opening of the insertion hole 74 of the moving die plate 58. At this time, the half nut 76 provided on the moving die plate 58 is moved by the moving means 80 in a direction substantially perpendicular to the axis of the insertion hole 74, and the half nut 76 is meshed with the screw portion 72 formed on the tie bar 64 (FIG. 7). As a result, the tie bar 64 can be easily coupled and fixed to the moving die plate 58. Then fixed die plate 5
When pressure oil is supplied to one of the oil chambers 86 of the hydraulic cylinder 60 provided in FIG. 4, the moving die plate 58 is moved to the fixed die plate 54 side by directly moving the tie bar 64, and is moved with the fixed mold 52. A mold clamp with the mold 56 is achieved.

[0005]

However, in the above-mentioned conventional mold clamping device, when the mold is exchanged, the movable die plate is opened, but since the four tie bars 64 run vertically, the work space is reduced. However, there is a drawback in that the work becomes difficult to perform in the work of exchanging a heavy die because the work becomes narrower, the work efficiency is lowered, and there is a danger. In addition, although a crane is generally used for die replacement, there are many restrictions on the usability of the crane, such as the tie bar hindering the lateral movement of the tie bar or the tie bar having to be lifted high to pass over the upper tie bar. Further, since the movable die plate is moved linearly in parallel, a long stroke cylinder is required, which is not preferable in design, and cost is increased, and there is a problem to be solved such as an increase in installation area of the device. . Therefore, the present invention is intended to solve the above-mentioned conventional problems by making the movable die plate rotatable about a vertical axis.

[0006]

Therefore, according to the present invention, there is provided a fixed die plate which is fixed to a support frame and holds a fixed mold, and a movable body which is rotatably supported by a vertical shaft provided on the support frame. A die plate, a die holder for holding a movable die provided on the movable die plate, a mold clamping means for moving the die holder provided on the movable die plate forward and backward, and first and first fixed members fixed to the fixed die plate. 2 tie bars, means for connecting the first diver to the vertical shaft 10, locking means for locking the tip of the second tie bar to the moving die plate, and rotating the moving die plate about the vertical axis. It is provided with a rotating means for making it a means for solving the problem. Also, a fixed die plate fixed to the support frame to hold a fixed die, a movable die plate rotatably supported by a vertical shaft provided on the support frame, and a fixed die provided on the movable die plate. A movable mold forming a pair with the mold, a vertical shaft holding block rotatably provided on the same vertical shaft, a fixed die plate and the same vertical shaft holding block, and a first die connecting the fixed die plate and the moving die plate. 2 tie bars,
Means for rotating the movable die plate about the vertical axis,
Locking means for locking the tip of the second tie bar between the movable die plate and the fixed die plate to the movable die plate is provided, and mold clamping means for moving the movable die plate forward and backward is provided on the fixed die plate side of each tie bar. It is provided so that the movable die plate can be rotated to bring the fixed die and the movable die close to each other, and the die can be clamped by the die clamping cylinder, which is a means for solving the problem. is there.

[0007]

[Operation] When the tie bar having the threaded portion is connected to the movable die plate by the half nut, the movable die plate becomes parallel to the fixed die plate. When the stroke of the mold clamping cylinder is shortened in this state, the fixed mold and the movable mold are Is opened by an appropriate distance, and when the stroke is extended, the two come into contact with each other to close the mold, and when further extended, tension is generated in the tie bar,
Both dies are strongly pressed and are in a mold clamped state. In this mold clamped state, resin is injected from the injection machine on the fixed die plate side to perform molding. After the resin has cooled, the stroke of the mold clamping cylinder is shortened to open both molds by an appropriate distance, and the half nut is opened to release the connection with the tie bar. Then, the movable die plate is rotated by an appropriate angle by the mold opening / closing cylinder to open the space between the two molds (mold open state), and the molded product is taken out.
Thereafter, the movable die plate is returned to its original position by the mold opening / closing cylinder, and the above-described molding operation is repeated. When exchanging the molds, first, the fixed mold and the movable mold are integrally fixed, then the fixed die plate is uncoupled and both molds are attached to the movable die plate. The movable die plate is rotated by 90 ° by the die opening / closing cylinder in the same procedure as the die opening, and the integrated die is removed at this position. Since there is no tie bar on the front side of the movable die plate to which the mold is attached, the work can be easily performed. Install the new mold to be replaced in the reverse order.

According to the second aspect of the invention, instead of performing the mold clamping with a hydraulic cylinder for clamping the mold having a large diameter and a small stroke, which is provided on the movable die plate, a tie bar provided between the movable die plate and the fixed die plate, The die clamping is performed by using a tie bar that connects the movable die plate and the fixed die plate to the movable die plate via the vertical axis and the vertical axis holding block, and the hydraulic cylinders for die clamping that are respectively coupled to the two types of tie bars.

[0009]

1 is a front view of this mold clamping device, FIG. 2 is a plan view of the same, and FIG. 3 is a left side view of FIG. In the figure, 1 is a supporting frame of the mold clamping device, 2 is a fixed die plate fixed to one end of the supporting frame 1, 3 is a fixed die attached to the fixed die plate 2, and 4 is a surface facing the fixed die plate 2. Moving die plate 5 mounted on the supporting frame 1 is supported by the moving die plate 4 and moves back and forth (left and right direction in FIG. 1).
The die holder 6 is a movable die attached to the die holder 5. 7 is a linear rail fixed to the support frame 1, 8 is two linear guides for the linear rail 7, and 9 is a linear guide.
Is a movable base that can be moved back and forth on the linear rail 7 via a linear guide 8, 10 is a vertical axis fixed vertically to the movable base 9, 11 is a thrust bearing, 12 is a roller, 13 is a belt rail, and a movable die. The plate 4 is rotatably supported at one end (FIGS. 2 and 3) by a vertical shaft 10, and its own weight is supported by a thrust bearing 11 and a roller 12 at both ends. The portion is provided with two notch holes 4a which are notched in the lateral direction. The linear guide 8 is engaged with the linear rail 7 only in the longitudinal direction, and is engaged in a state in which the vertical cross section is constrained both vertically and horizontally.

Reference numerals 14 and 15 denote first and second tie bars fixed to the four corners of the fixed die plate 2 with nuts.
The tie bar 14 has an eyebolt shape through a connecting means, and a hole at the tip is externally fitted to the vertical shaft 10, and the second tie bar 15 has a screw portion 15a at the tip, and the vertical shaft 10
Is installed on the opposite side of. 16 is the second tie bar 15
It is a stopper attached to the position adjustable. Reference numeral 17 denotes a large-diameter cylinder formed in the central portion of the movable die plate 4, and 18 denotes a rod 18 fitted inside the large-diameter cylinder 17.
The piston that is connected to the die holder 5 by a forms a mold clamping cylinder 19 with both. Reference numeral 5a is a rotation stop rod slidably fitted in the hole of the movable die blade 4 so that the die holder 5 does not rotate around the axis of the piston rod 18a, and a slide key or other rotation stop may be used. Reference numeral 20 denotes two half nuts which are divided into two and are arranged at one end of the movable die plate 4 so as to face each other vertically. Reference numeral 21 denotes a cylinder, which is a pair although not shown in detail. The half nut 20 is the cylinder 2
1 slides up and down to open and close, and when closed, one nut is formed to mesh with the screw portion 15a of the second tie bar 15. Reference numeral 22 denotes a bayonet type mold opening / closing cylinder in which the cylinder body is rotatably attached to the fixed die plate 2 and the tip of the rod is rotatably attached to an arm 23 provided on the moving die plate 4.

Next, the operation of the embodiment constructed as described above will be explained. The position A indicated by the one-dot chain line in FIG.
The movable die plate 4 is shown in a mold open state in which it is rotated clockwise by an appropriate angle (45 ° in the figure), which is a fixed position determined by the mold opening / closing cylinder 22. Then, when pressure oil is sent to the mold opening / closing cylinder 22 to extend the stroke length, the moving die plate 4 rotates counterclockwise in FIG. 2, and the second tie bar 15 is moved between the notch hole 4a and the paired half nuts 20. Then, the side surface of the tip portion of the movable die plate 4 comes into contact with the stopper 16 and stops.
Here, when the half nut 20 is closed by the cylinder 21 and coupled with the second tie bar 15, the state shown by the solid line in FIG. 2 is obtained, and the fixed mold 3 and the movable mold 6 are slightly open. The phase of the half nut 20 and the threaded portion 15a of the second tie bar 15 is adjusted by the stopper 16 so as to just mesh with each other. Next, the pressure oil is sent to the mold clamping cylinder 19 and the piston 1
When 8 and the die holder 5 are moved to the right, the movable mold 6 comes into contact with the fixed mold 3 to be in a mold closed state, and then tension is generated in the first tie bar 14 and the second tie bar 15, and the capacity of the mold clamping cylinder 19 is increased. The mold is clamped with a full force (Fig. 1). At this time, the second tie bar 15 side of the movable die plate 4 is opened by the play size of the meshing portion of the half nut 20, but the movable die plate 4 is preliminarily set so as to be parallel to the fixed die plate 2 in the mold clamping state. 1, second tie bar 1
The protrusion length of 4 or 15 is adjusted. Next, the molten resin is injected from the injection machine 24 to form a molded product.
When the mold is opened after molding is completed, first, pressure oil is sent to the mold clamping cylinder 19 to retract the piston 18 to the left limit position, and the cylinder 21 causes the half nut 2 to move.
Open 0. Next, pressure oil is sent to the mold opening / closing cylinder 22 to reduce the stroke length, and the movable die plate 4 is rotated clockwise to the fixed position (mold open state).

Next, the operation in the case of die replacement will be described. First, the fixed mold 3 and the movable mold 6 are coupled with each other in a clamped state, the fixed mold 3 and the fixed die plate 2 are uncoupled, and the movable die plate 4 is moved to the A position (mold) by the same procedure as described above. Open to the fixed position) and then rotate it further to the position indicated by the chain double-dashed line B in FIG. 2 (90 ° rotated position). At this position, the fixed mold 3 and the movable mold 6 are integrally removed. At this position, since the first and second tie bars 14 and 15 are not provided, the working space is wide and the crane can be used freely. Also, a new mold for replacement may be attached in the reverse order of the above. Although the second tie bar 15 is fixed to the fixed die plate 2 in the above embodiment, the second tie bar 15 may be fixed to the movable die plate 4 side and the half nut 20 may be provided to the fixed die plate 2 side. Good. In this case, the two dies can be integrated and attached to the fixed die plate 2 when the dies are replaced. Further, in this embodiment, the mold opening / closing cylinder 22 is attached to the side surface and the movable die plate 4 is laterally opened via the arm 23. However, the fixed die plate 2 and the movable die plate are provided within a range that does not interfere with die replacement and product removal. It may be provided on the upper part 4.

Next, a second embodiment according to the present invention will be described with reference to FIGS.
The difference between the second embodiment and the first embodiment is that the mold clamping cylinder 19 is attached to the movable die plate 4 in the first embodiment, and the mold is moved by the mold clamping cylinder 19 via the die holder 5. 6 is clamped according to the fixed mold 3, the mold clamping cylinder 3 is provided on the fixed die plate 2 side of the first and second tie bars 14 and 15 in the second embodiment.
3 is provided and the mold is clamped by the cylinder 33. Reference numeral 34 in the drawing denotes a vertical shaft holding block which rotatably holds the vertical shaft 10 attached to the tip of the first tie bar 14.

Next, the operation of the second embodiment constructed as described above will be described. The position A indicated by the alternate long and short dash line in FIG. 5 shows the mold opening state in which the movable die plate 4 is rotated clockwise by an appropriate angle (45 ° in the figure), and is a fixed position positioned by the mold opening / closing cylinder 22. is there. When pressure oil is sent to the mold opening / closing cylinder 22 to extend the stroke length, the movable die plate 4 rotates counterclockwise in FIG.
The second tie bar 15 is taken in between the notch hole 4a and the paired half nuts 20 and inserted therethrough, and the moving die plate 4
The side surface of the tip end of the abuts against the stopper 16 and stops. Here, when the half nut 20 is closed by the cylinder 21 and coupled with the second tie bar 15, the state shown by the solid line in FIG. 5 is obtained, and the fixed mold 3 and the movable mold 6 are slightly open. The phase of the half nut 20 and the threaded portion 15a of the tie bar 15 is adjusted by the stopper 16 so as to just mesh with each other. Next, pressure oil is sent to the mold clamping cylinder 33 to move the die plate 4
When is moved to the right, the movable mold 6 comes into contact with the fixed mold 3 to be in the mold closed state, and when pressure oil is further sent to the mold clamping cylinder 33, the mold clamping cylinder 33 performs the mold clamping with the force full of the capacity. (Fig. 4). Next, the molten resin is injected from the injection machine 24 to form a molded product. When the mold is opened after the molding is completed, hydraulic pressure is applied to the mold clamping cylinder 33 so that the first tie bar 14 fixes the movable die plate 4 through the vertical shaft holding block 34 attached to the tip of the tie bar and the vertical shaft 10. Move it away from the die plate 2,
The second tie bar 15 moves the moving die plate 4 in a direction away from the fixed die plate 2 via the half nut 20 fixed to the moving die plate 4 at the other end of the tie bar. At that time, needless to say, hydraulic pressure is applied to each of the mold clamping cylinders 33 at the ends of the first and second tie bars 14 and 15 so that the movable die plate 4 becomes even with respect to the fixed die plate 2. Next, after the fixed die plate 2 and the movable die plate 4 are sufficiently separated from each other, hydraulic pressure is applied to the mold opening / closing cylinder 22 in the same manner as in the first embodiment to move the movable die plate 4 to the position A in the figure about the vertical axis 10. Rotate and remove the molded product.

Explaining the operation of exchanging molds, the fixed mold 3 and the movable mold 6 are joined together in a clamped state, and the fixed mold 3 is joined.
And the fixed die plate 2 are uncoupled, and the movable die plate 4 is moved to the A position (fixed position of mold opening) by the same procedure as described above.
Open up to and further rotate, and open up to the position of the chain double-dashed line B in FIG. 5 (90 ° rotated position). At this position, the fixed mold 3 and the movable mold 6 are integrally removed. At this position, since the first and second tie bars 14 and 15 are not provided, the working space is wide and the crane can be used freely. Also, a new mold for replacement may be attached in the reverse order of the above. Although a separate cylinder 33 is fixed to the fixed die plate 2 as the mold clamping cylinder 33 in the above embodiment, a cylinder portion is formed in the fixed die plate to form a mold clamping cylinder integral with the fixed die plate. You can also

[0016]

As described above in detail, according to the present invention, the tie bar does not get in the way when the mold is replaced, the work can be performed in a wide area, and the crane can be used without any restrictions on usability. Efficiency and work safety are improved. In addition, the installation area of the device is small and a long stroke hydraulic cylinder is not required, which can contribute to cost reduction and a mold rotating cylinder with a large force is required because the moving die plate is only opened sideways when the mold is opened. It has an excellent effect such as not.

[Brief description of drawings]

FIG. 1 is a front view of a mold clamping device according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a front view of a mold clamping device according to a second embodiment of the present invention.

5 is a plan sectional view of FIG.

FIG. 6 is a plan sectional view of a conventional mold clamping device (mold open state).

FIG. 7 is a left side sectional view of the same mold clamping device (mold open state).

[Explanation of symbols]

 1 Support Frame 2 Fixed Die Plate 3 Fixed Die 4 Moving Die Plate 5 Die Holder 6 Moving Die 9 Moving Stand 10 Vertical Axis 14 1st Tie Bar 15 2nd Tie Bar 19 Die Cylinder (Die Clamping Means) 20 Half Nut 22 Die Open / Close Cylinder (rotating means)

Claims (2)

[Claims] 1. A fixed die plate fixed to a support frame for holding a fixed die, a movable die plate rotatably supported by a vertical shaft provided on the support frame, and a movable die plate provided on the movable die plate. The die holder for holding the movable die, the die clamping means for moving the die holder provided on the movable die plate forward and backward, the first and second tie bars fixedly mounted on the fixed die plate, and the first diver vertically It is characterized by comprising means for connecting to the shaft 10, locking means for locking the tip of the second tie bar to the moving die plate, and rotating means for rotating the moving die plate about a vertical axis. Horizontal open mold clamping device. 2. A fixed die plate which is fixed to a support frame and holds a fixed die, and a movable die plate which is rotatably supported by a vertical shaft provided on the support frame.
A movable die provided on the movable die plate and forming a pair with a fixed die, a vertical axis holding block rotatably provided on the same vertical axis, and a fixed die plate and the same vertical axis holding block and a fixed die plate are moved. First and second tie bars connecting the die plates, a means for rotating the movable die plate around the vertical axis, and a tip of the second tie bar between the movable die plate and the fixed die plate is locked to the movable die plate. Locking means is further provided, and mold clamping means for moving the movable die plate forward and backward is provided on the fixed die plate side of each tie bar, and the movable die plate is rotated to bring the fixed mold and the movable mold close to each other. A laterally open mold clamping device characterized in that the mold can be clamped by a clamping cylinder.