JPH04284961A - Ejecting cylinder device - Google Patents

Abstract

PURPOSE:To reduce deflection of a shifting die plate, to increase rigidity and to improve the workability by reducing projecting dimension of an ejecting cylinder device body from the shifting die plate and shortening distance between action points of die clamping force in toggle link mechanism. CONSTITUTION:This device has the peculiarity, in which the cylinder 14 is embedded in the shifting die plate 1 and a piston rod 16 is excentrically fitted to axis of a piston 15.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion cylinder device used in a mold clamping device equipped with a toggle link mechanism such as a die casting machine.

0002

2. Description of the Related Art A conventional mold clamping device equipped with a toggle link mechanism has a structure as shown in FIGS. 2 to 4, for example. That is, a fixed die plate 101 to which a fixed mold 100 is mounted, a movable die plate 103 to which a movable mold 102 is mounted, and this movable die plate 10.
The mold clamping cylinder 104 is provided for moving the die plate 3 forward and backward toward the fixed die plate 101.
Support plate 105 supporting 04 and moving die plate 103
A toggle link mechanism 106 is provided between the two.

[0003] An extrusion cylinder device main body 107 for extruding a molded product is provided on the end surface of the movable die plate 103 provided with the toggle link mechanism 106. This extrusion cylinder device main body 107 has a cylinder 108
and a piston 109 inserted into the cylinder 108,
a piston rod 110 connected to the piston 109;
It consists of Then, the piston rod 110 is fixed to the movable die plate 103, and the cylinder 10
8 in a free state and supplying hydraulic pressure into the cylinder 108 to drive the cylinder 108 back and forth.

[0004] The flange portion 111 of this cylinder 108 is inserted through a push-out plate 112 provided on the movable die 102 side of the movable die plate 103 and a press rod 114 inserted into a through hole 113 provided in the movable die plate 103. As the cylinder 108 moves, an extrusion pin 115 provided on an extrusion plate 112 is driven to extrude a product 116 from the movable mold 102.

The cylinder 108 also has an arm 117 extending left and right, and this arm 117 is connected to a guide bar 118.
It was supported so that it could slide freely.

[0006]

[Problems to be Solved by the Invention] In the conventional extrusion cylinder device described above, the toggle link mechanism 106 opens and closes in response to mold closing and mold opening, as shown in FIGS.
Since the link 119 pivotally supported by the movable die plate 103 swings, it is necessary to avoid interference with this link 119. However, in the conventional extrusion cylinder device main body 107, since its protruding dimension I had no choice.

Therefore, as shown in an exaggerated manner in FIG. 5, the movable die plate 103 is deflected greatly in response to the moment load applied during mold clamping, which causes a decrease in rigidity and a decrease in the dimensional accuracy of the cast product. Ta.

Further, in order to prevent the cylinder 108 from rotating, an arm 117 is extended to the left and right, and a guide bar 118 is attached to the cylinder 108.
It was supported so that it could slide freely. Since such a relatively large diameter guide bar 118 is fixed to the movable die plate 103 across the operation side and the non-operation side of the mold clamping device, the workability is extremely deteriorated.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to reduce the protrusion dimension of the extrusion cylinder device main body from the movable die plate and to improve the shape of the toggle link mechanism. The objective is to reduce the deflection of the movable die plate by shortening the distance between the points where the clamping force is applied, thereby increasing the rigidity and improving workability.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an extrusion cylinder device main body for extruding a product is attached to the end face of a movable die plate provided with a toggle link mechanism. In the extrusion cylinder device, the extrusion cylinder device main body is composed of a cylinder, a piston inserted into the inner periphery of the cylinder, and a piston rod connected to the piston, in which the cylinder is embedded in a movable die plate, and the piston rod is is mounted eccentrically with respect to the axis of the piston.

[0011]

[Operation] In the extrusion cylinder device with the above configuration, the cylinder is embedded in the movable die plate, so the protrusion dimension of the extrusion cylinder device main body from the movable die plate can be reduced, while avoiding interference with the toggle link mechanism. The distance between the pivot point of the link of the toggle link mechanism, which is the point of load application during mold clamping, and the central axis of the movable die plate can be reduced.

Furthermore, by mounting the piston rod eccentrically with respect to the piston, rotation can be prevented without providing a guide bar as in the conventional case.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows a part of a mold clamping device with a toggle link mechanism equipped with an extrusion cylinder device according to an embodiment of the present invention. In the figure, 1 is a movable die plate on which a movable mold 2 is attached, and a plurality of tie bars 3, 3 pass through this movable die plate 1, and the movable die plate is guided by these tie bars 3, 3. 1 moves forward and backward with respect to the stationary die plate 4 to clamp and open the stationary die 5 and the movable die 2. The movable die plate 1 is provided with a toggle link mechanism 6, and in this embodiment, the driving force of the mold clamping cylinder 8 attached to the support plate 7 is transmitted as in the conventional case shown in FIGS. 2 and 3. The force is transmitted to the movable die plate 1 via the toggle link mechanism 6. In the illustrated example, only one side is shown, but as shown in FIGS. 2 and 3, they are provided on both sides.

The toggle link mechanism 6 has first and second links 9 and 10 connected in a dogleg shape, pivoted between the support plate 7 and the movable die plate 1, and the first link 9 connected to the third link 11. It is connected to the crosshead 12 at the end of the rod of the mold clamping cylinder 8 through the mold clamping cylinder 8, and when the mold is opened, the first and second links 9, 10
is bent and the second link 10 tilts inward, and when the mold is closed, the first and second links 9, 10 are bent as shown by the two-dot chain line in the figure.
opens, and the inclination of the second link 10 becomes smaller.

On the other hand, an extrusion cylinder device main body 13 is provided at the center of the movable die plate 1. This extrusion cylinder device main body 13 includes a cylinder 14, a piston 15 inserted into the cylinder 14, and a piston rod 16 connected to the piston 15.

The cylinder 14 is embedded in the movable die plate 1, and its opening is liquid-tightly closed by a head 17. The interior of the cylinder 14 is moved into first and second chambers 18, 1 by a piston 15 inserted so as to be able to reciprocate.
Divided into 9, each chamber 18, 19 and hydraulic port 2
0 and 21 are connected by oil passages 22 and 23. The piston rod 16 has one end eccentrically attached to the axis O of the piston 15 by a predetermined amount e, and the head 17
The piston rod 16 is slidably inserted into the inner periphery of an eccentric hole 24 in a liquid-tight manner, and guides the piston rod 16 in a non-rotatable manner. The axis O of this piston 15 is coaxial with the central axis of the movable die plate 1.

On the other hand, a press plate 25 is fixed to the other end of the piston rod 16, and a press plate 27 is connected between the press plate 25 and an extrusion plate 26 provided on the movable die 2 side of the movable die plate 1. A push-out pin 28 is provided upright on the push-out plate 26 .

[0018] In the extrusion cylinder device having the above configuration,
After casting is completed, move die plate 1 to fixed die plate 4.
The mold is opened by retreating from the cylinder 14, and then pressure oil is supplied into the first chamber 18 on one side of the cylinder 14 to move the piston 15 into the second chamber.
Move it to the room 19 side. The movement of the piston 15 is transmitted to the extrusion pin 28 via the piston rod 16, the pressing plate 25, the pressing rod 27, and the extrusion plate 26, and the extrusion pin 28
A cast product 29 is extruded from the movable mold 2 by 8.

Since the cylinder 14 is embedded in the movable die plate 1, the protruding dimension X from the end face of the movable die plate 1 is shorter than the conventional one by the length of the cylinder 14, and the toggle link mechanism 6 interference with the second link 10 is reduced.

[0020] Therefore, the distance Y between the center of the link pin 30 of the second link 10, which is the point of load application during mold clamping, and the central axis O of the movable die plate 1 can be made smaller than before. By reducing the distance Y between the link pin 30 and the center axis, the distance between the points where the mold clamping force acts can be reduced, and the moment load that acts on the movable die plate 1 during mold clamping is reduced, and the movable die Deflection of the plate 1 can be reduced. As a result, it is possible to improve the dimensional accuracy of the cast product 29 and the rigidity of the movable die plate 1.

Furthermore, the piston rod 16 is connected to the piston 15.
Since the piston rod 16 is mounted eccentrically relative to the cylinder 14, the eccentric hole 24 provided in the head 17 of the cylinder 14 can prevent the piston rod 16 from rotating, eliminating the need for a conventional guide bar to guide the cylinder. , the operation side and non-operation side of the mold clamping device are opened, improving work efficiency.

The mold clamping device of the above embodiment is merely an example, and can be broadly applied to mold clamping devices equipped with a toggle link mechanism. It goes without saying that the configuration is not limited to the illustrated example.

[0023]

Effects of the Invention The present invention has the above-described structure and operation. By embedding the cylinder in the movable die plate, the protruding dimension of the extrusion cylinder device main body from the movable die plate is reduced, so that the toggle link mechanism can be reduced. The distance 2Y between the mold clamping force application points can be reduced, the deflection of the movable die plate can be reduced, and the rigidity can be increased.

Furthermore, by mounting the piston rod eccentrically with respect to the piston, it is possible to prevent the piston rod from rotating without using a conventional guide bar, and the structure is simplified and the surroundings of the extrusion cylinder device can be prevented. Workability can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a schematic configuration of an extrusion cylinder device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a mold clamping device with a toggle link mechanism equipped with a conventional extrusion cylinder device in a mold open state.

FIG. 3 is a schematic configuration diagram of the device shown in FIG. 2 in a mold-clamped state.

FIG. 4 is an enlarged sectional view of the extrusion cylinder device of FIG. 2;

5 is a front view showing an exaggerated amount of deflection of a movable die plate in order to explain the problem of the extrusion cylinder device of FIG. 4; FIG.

[Explanation of symbols]

1　Moving die plate 2　Moving mold 3 Tie bar 4 Fixed die plate 5 Fixed mold 13　Extrusion cylinder device main body 14 Cylinder 15 Piston 16 Piston rod 17 Head 24 Eccentric hole 25 Press plate 26 Extrusion plate 27 Pressure rod 28　Extrusion pin 29 Cast products 30 Link pin X　Protrusion dimension

Claims (1)

[Claims] Claim 1: An extrusion cylinder device main body for extruding a product is attached to an end face of a movable die plate provided with a toggle link mechanism, and the extrusion cylinder device main body is connected to a cylinder and a piston inserted into the inner periphery of the cylinder. and a piston rod connected to the piston, characterized in that the cylinder is embedded in a movable die plate, and the piston rod is mounted eccentrically with respect to the axis of the piston. Extrusion cylinder device.