JPH08215825A - Device for die-clamping in forming machine - Google Patents

Abstract

(57) [Abstract] [Purpose] It has a structure that can reduce the weight and increase the strength, and can be easily attached to and detached from a movable plate or a fixed plate regardless of the size of the mold. [Structure] An integral structure in which a pair of frames are suspended in a vertically diagonal line between a cylinder platen and a fixed platen.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a resin product injection molding machine,
The present invention relates to an apparatus for clamping a die in a metal product die casting machine, a compression molding machine, a deep drawing press, a stamping machine, or the like.

[0002]

2. Description of the Related Art FIG. 10 is a schematic view of a conventional die casting machine, in which a fixed mold 2 mounted on a fixed plate 1 and a movable mold 4 mounted on a movable plate 3 are clamped by the movable plate. 3 and the link housing 5 by means of a mold clamping mechanism 7. Reference numeral 9 indicates a mold clamping cylinder.

[0003]

However, the fixed mold 2 is used.
Since the movable die 4 and the movable die 4 have different sizes and thicknesses depending on the size and shape of the product, the width dimension S of the die 4 (or the die 2) is smaller than the inner dimension L between the tie bars 6 as shown in FIG. (L
> S), the mold 4 can be attached to and detached from the movable platen 3, but in the case of L <S, the molds 2 and 4 are inserted between the tie bars 6.
Since it is difficult to take in and out of the tie bar 6, the tie bar nut 8 of one of the four tie bars 6 (usually the upper tie bar) 6 is removed, and the tie bar 6 is pulled out to the link housing 5 side.

For this reason, it takes a lot of time to pull out and reattach the tie bar 6.

Further, as the mold clamping device, the link housing 5, the movable platen 3 and the fixed platen 1 are separate bodies,
These three members are connected by a tie bar 6 and are held in a state of being separated by a certain distance.

Therefore, if such a structure is adopted,
In order to obtain the required rigidity between the link housing 5, the movable platen 3, and the fixed platen 1, a separate structure must be used to form a strong structure, and each member also becomes thick and heavy, making it difficult to install and to age it. It is extremely disadvantageous.

The present invention has been made in view of the above problems, and an object of the present invention is to have a structure capable of reducing the weight and increasing the strength, as well as a movable plate or a movable plate regardless of the size of the mold. Provided is a mold clamping device for a molding machine, which can be easily attached to and detached from a fixed plate in a short time.

[0008]

In order to achieve the above object, according to a first aspect of the present invention, a fixed plate having a fixed die and an axially installed fixed plate facing each other are provided. A movable plate having a movable mold that can move relative to the fixed plate by moving back and forth along with a movable plate and a cylinder platen on the opposite side of the movable plate from the fixed plate and movable to the cylinder platen. A mold clamping device for a molding machine, wherein a platen is provided with a movable cylinder that can move forward and backward with respect to a fixed platen, and an integrated structure is provided by hanging a frame between the fixed platen and a cylinder platen. A pair of frames were arranged diagonally above and below the stationary platen and the cylinder platen. In the third invention, the frame suspended between the fixed platen and the cylinder platen is detachable.

[0009]

According to this structure, a pair of upper and lower frames are integrally formed between the cylinder platen and the fixed plate, and
The rigidity of the mold clamping device is increased by providing the frame in a diagonally vertical shape. Since the opening between the frames can be made large, the work of exchanging the mold can be smoothly performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a mold clamping device for a molding machine according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of a mold clamping device of a molding machine according to the present invention, FIG. 2 is a plan view of a mold clamping device having a frame integrated structure, and FIG. 3 is a partial sectional front view of the mold clamping device. 4 is A in FIG.
~ A side view seen from A, Fig. 5 is a side view seen from B to B of Fig. 2, Fig. 6 is a front view of the gate lock device seen from C to C of Fig. 2, and Fig. 7 is a mold clamping with the frame detachable. FIG. 8 is a plan view of the apparatus, FIG. 8 is a schematic view of a mold clamping device when one pressure rod is used, and FIG. 9 is an explanatory view showing an opening for taking a mold in and out of a fixed plate or a movable plate.

FIG. 1 is a sectional view of a molding machine such as an injection device equipped with a mold clamping device according to an embodiment. As shown in this figure, the mold clamping device 10 includes a fixed plate 12, a movable plate 14, a cylinder platen 16, a fixed mold 18, a movable mold 20, a die height adjusting device 22 and a gate lock device 23.

The fixed mold 18 is attached to a fixed platen 12 fixed on one end of a machine base 24, while
On the other end of the machine base 24, there is provided a movable plate 14 facing the fixed plate 12 and having a movable mold 20 attached thereto.

A cylinder platen 16 is arranged on the opposite side of the movable platen 14 from the fixed platen 12. A mold opening / closing cylinder 26 is provided on both side portions of the cylinder platen 16, and a rod 26 extending from the mold opening / closing cylinder 26 is provided.
The front end of a is fixed to the back surface of the movable platen 14, and the movable platen 14 is fixed to the stationary platen 1 by supplying and discharging hydraulic pressure to and from the mold opening / closing cylinder 26.
2 is slidable on the linear guide 28.

In this mold clamping device 10, a pair of pressure rods 30 and 32 are arranged vertically separated from each other. One end of the pressure rods 30 and 32 is inserted into a connecting plate 86 having a large number of product pushing pins 84 attached thereto, and is then bolted to the rear surface of the movable platen 14 (the surface of the movable platen 14 opposite to the fixed platen 12). Installed.

Above and below the cylinder platen 16 is shown in FIG.
As shown in FIG.
6) is provided. A pressure ram 38 (40), which is a combination of cylinders having different diameters, is mounted in the through hole 34 (36).

The length of the pressure ram 38 (40) is formed longer than the width of the cylinder platen 16, and the packing presser 42 is provided between the front and rear surfaces of the cylinder platen 16 and the outer peripheral surface of the pressure ram 38 (40). Is installed. A seal ring for preventing oil leakage is attached between the packing presser 42 and the outer peripheral surface of the pressure ram 38 (40).

Through holes 34 (36) of the cylinder platen 16
The pressurizing chamber 46 (48) is provided in the gap between the pressurizing ram 38 (40) and the pressurizing ram 38 (40) so that pressure oil can be introduced to perform mold clamping. Reference numeral 50 indicates packing.

A screw is engraved on the inner wall surface of the pressure ram 38 (40), and is screwed into the inner wall surface of the pressure ram 38 (40) to form a cylinder at the center of the pressure ram 38 (40). Shaped pressure screw 52 (54) is provided.

The trapezoidal screws engraved on the inner wall surface of the pressure ram 38 (40) are different on both sides. For example, the pressure ram 3
If 8 is a right trapezoidal screw, the pressure ram 40 is configured to be a left trapezoidal screw.

A pressure screw 52 (5 having a through hole 66)
4) is attached to one end of the gate lock plate 56 with a bolt or the like in a direction orthogonal to the gate lock plate 56.
The other end of is formed as a free end.

At the rear end of the pressure ram 52 (54) (on the side opposite to the gate lock plate 56), there is a transmission gear 58 (6).
0) is attached, the power from the forward / reverse hydraulic motor 62 is transmitted to the transmission gears 58, 60 via the first transmission gear 64, and the pressure rams 38, 40 are rotated in opposite directions, respectively. The structure is such that the lock plate 56 can be moved leftward or rightward in FIG.

Insertion holes 70 and 72 having the same inner diameter as the pressure screws 52 and 54 are provided above and below the gate lock plate 56, and the pressure rams 38 and 40 described above are engaged therein. It is possible to enter.

The gate lock device 23 is a gate lock plate 5
6, gate lock cylinder 68 and gate lock 74
It consists of A gate lock cylinder 68 is arranged at an upper end of the gate lock plate 56, and one end of a gate lock 74 is rotatably supported by a tip end of a rod 68a of the gate lock cylinder 68.

The gate lock 74 has a spectacle-like structure so that the insertion holes 70 and 72 can be closed at once, and the central portion of the gate lock 74 is rotatably supported by a support shaft 76.

The rear end of the gate lock cylinder 68 is rotatably supported at a position separated from the insertion hole 70, and the gate lock 74 is shown by the solid line from the open state shown by the chain line in FIG. 6 by the expansion and contraction of the rod 68a. It is configured to be movable between closed states. The gate lock 74 may be moved straight instead of being tilted as in this embodiment.

In the mold clamping device 10 having the above-described structure, as shown in FIG. 1, the cylinder platen 16 and the stationary platen 1 are provided.
A frame 80 having an integral structure is arranged in a diagonally upper and lower two lines.

The reason why the pair of frames 80 are provided in a diagonal shape vertically is that the large openings 7 shown by XY in FIG. 9 are provided so as to facilitate the exchange of the molds 18, 20 as shown in FIG.
8 is provided, and the normal mold height h is 1.4 to
The maximum die height H having a die height of 1.7 times can be exchanged without removing the frame 80.

As described above, by suspending the frame 80 between the cylinder platen 16 and the fixed plate 12 to form an integral structure, there is no influence of deterioration of rigidity due to aging. The cross-sectional shape of the frame 80 has a rectangular shape as shown in FIG. 9, but is not limited to this, and it is desirable that the rigidity can be maintained.

The frame 80 is connected to the cylinder platen 16
However, the present invention is not limited to this, and both ends of the upper frame 80 may be attached with bolts 87 as shown in FIG.

Further, as shown in FIG. 8, the pressure rod 30
May be disposed at the center of the mold clamping direction, and the pressure ram 38 may be disposed on the cylinder platen 16 side so that the pressure rod 30 can be fitted therein.

In the present invention, the movable plate 14 of the fixed plate 12 is used.
An injection device 92 is arranged on the side opposite to. The injection device 92 is composed of an injection cylinder 94 and an injection sleeve 96. As shown in FIG. 1, an injection frame 98 integrally formed with the fixed plate 12 is arranged and has a hollow structure as a whole.

The injection cylinder 9 is provided at the rear edge of the injection frame 98.
4 is fixed, and the injection sleeve 96 is attached to the stationary platen 12 which is relatively thin. Reference numeral 100 is a hot water supply port provided on the injection sleeve 96.

In the present invention, the injection frame 98 is the fixed platen 1.
Fixed plate 12 with bolts etc. because it is an integral structure with 2
It is not necessary to mount the injection cylinder 94 on the fixed platen 12, and only the centering work for mounting the injection cylinder 94 on the fixed plate 12 is unnecessary.

On the other hand, an opening 102 for supplying molten metal is formed on the side surface of the injection frame 98.

The operation of the mold clamping device 10 of the molding machine having the above structure will be described.

The fixed mold 18 and the movable mold 20 are opened, and when the mold is clamped from this state, pressure oil is introduced into the mold opening / closing cylinder 26 to move the movable platen 14 by the stroke of the mold opening / closing cylinder 26. The fixed mold 18 and the movable mold 20 are moved forward to asymptote.

When the fixed mold 18 and the movable mold 20 come into contact with each other, the gate lock cylinder 68 is actuated to extend the rod 68a, so that the gate lock 74 is locked by the gate lock 74 from the chain line in FIG. 6 showing the open state of the insertion hole 70. Insertion hole 70
Moves to the solid line showing the closed state, and the pressure rod 30
(32) is prevented from being introduced into the pressure screw 52 (54), and the tip of the pressure rod 30 (32) is stopped in the vicinity of the gate lock 74.

When pressure oil is introduced into the pressurizing chamber 46 in this state, the gate lock plate 56 moves rightward in the state shown in FIG.
Is pressed and the mold is clamped.

After completion of the mold clamping, the molten metal supplied into the injection sleeve 96 is filled in the mold cavity (not shown),
Cooled.

To take out the cooled product, first, the gate lock cylinder 68 is operated to tilt the gate lock 74 and open the insertion hole 70 (72). Next, when the mold opening / closing cylinder 26 is operated and the movable platen 14 is retracted to open the mold, the pressure rod 30 (32) moves the pressure screw 52.
The movable platen 14 is locked in (54) and stops at a predetermined position.

When it is desired to replace the fixed mold 18 and the movable mold 20 by changing the shape of the product, both molds 18,
The size of 20 changes, which may change the die height.

Therefore, when the die height (the total width dimension of both molds 18 and 20) becomes larger than, for example, the currently installed die height, when the hydraulic motor 62 is rotated in a predetermined rotation direction, the first transmission gear 64 rotates. The transmission gear 58 moves and the power is transmitted to the first transmission gear 64, and the transmission gear 58 rotates clockwise, for example.

Further, the transmission gear 60 to which power is transmitted from the transmission gear 58 rotates, for example, in the counterclockwise direction on the side opposite to the transmission gear 58.

As described above, the rotation of each of the transmission gears 58 and 60 causes the pressure screw 52 (54) to move leftward to a predetermined position in FIG. 3 via the pressure ram 38 (40), and the die height is increased. Can be large.

On the contrary, when the die height becomes small, when the hydraulic motor 62 rotates in the direction opposite to the rotating direction, the pressure screw 52 (54) moves rightward to a predetermined position in FIG. 3 and becomes small. It can be adapted to the die height.

[0047]

As is apparent from the above description, in the first aspect of the present invention, the fixed plate having the fixed mold and the fixed plate are installed so as to face each other in the axial direction. By moving forward and backward to change the relative position with respect to the fixed plate and having a movable mold, and a cylinder platen is provided on the opposite side of the movable plate from the fixed plate and the movable plate is provided on the cylinder platen. Is a mold clamping device of a molding machine in which a movable cylinder is provided so as to be able to move forward and backward with respect to the fixed plate, and the structure of the mold clamping device has an integral structure in which a frame is suspended between the fixed plate and the cylinder platen. Since the structure is increased in rigidity, the overall thickness can be reduced, the weight can be reduced, the accuracy, rigidity and durability of the whole can be increased, and the bending can be remarkably reduced.

Further, in the second aspect of the invention, since the pair of frames are arranged diagonally above and below the stationary platen and the cylinder platen, the opening can be made large, so that the mold replacement and the work can be facilitated.

Further, by making the frame suspended between the fixed platen and the cylinder platen detachable, by removing only the upper frame of the pair of upper and lower frames, it becomes easier to replace a large mold.

[Brief description of drawings]

FIG. 1 is a perspective view of a mold clamping device of a molding machine according to the present invention.

FIG. 2 is a plan view of a mold clamping device in which a frame has an integrated structure.

FIG. 3 is a partial cross-sectional front view of the mold clamping device.

FIG. 4 is a side view seen from AA of FIG.

5 is a side view seen from BB of FIG. 2. FIG.

FIG. 6 is a front view of the gate lock device as viewed from CC of FIG.

FIG. 7 is a plan view of a mold clamping device in which a frame is removable.

FIG. 8 is a schematic diagram of a mold clamping device in the case of using one pressure rod.

FIG. 9 is an explanatory view showing an opening for taking a mold in and out of a fixed platen or a movable platen.

FIG. 10 shows a conventional mold clamping device.

FIG. 11 is an explanatory diagram illustrating a conventional die replacement method.

[Explanation of symbols]

 10 Mold clamping device 12 Fixed plate 14 Movable plate 16 Cylinder platen 18 Fixed mold 20 Movable mold 22 Die height adjusting device 23 Gate lock device 26 Mold opening / closing cylinder 28 Linear guide 30, 32 Pressurizing rod 34 (36) Through hole 38 ( 40) Pressurizing ram 42, 44 Packing retainer 46 (48) Pressurizing chamber 50 Packing 52 (54) Pressurizing screw 56 Gate lock plate 58, 60 Transmission gear 62 Hydraulic motor 64 First transmission gear 66 Through hole 68 Gate lock cylinder 70 (72) Insertion hole 74 Gate lock 76 Spindle 78 Opening 80 Frame 84 Product extruding pin 86 Connecting plate 87 Bolt 92 Injection device 94 Injection cylinder 96 Injection sleeve 98 Injection frame 100 Hot water inlet 102 Opening

Claims (3)

[Claims] 1. A fixed plate having a fixed mold, and a movable mold which is installed so as to face the fixed plate and moves forward and backward along an axial direction so that a relative position between the fixed plate and the movable plate can be changed. A mold clamping device for a molding machine in which a movable plate having a movable plate and a cylinder platen provided on the opposite side of the movable plate from the fixed plate, and a movable cylinder capable of moving the movable plate forward and backward with respect to the fixed plate are provided on the cylinder platen. A mold clamping device for a molding machine, wherein the stationary platen and a cylinder platen are integrally framed with a frame. 2. The mold clamping device for a molding machine according to claim 1, wherein a pair of frames are arranged diagonally above and below the stationary platen and the cylinder platen. 3. The mold clamping device for a molding machine according to claim 1, wherein a frame suspended between the fixed platen and the cylinder platen is detachable.