JP3306501B2 - Injection mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold capable of forming a thick molded product with high precision.

[0002]

2. Description of the Related Art In injection molding of a thick molded product, a long cooling time is required to prevent sinking and deformation, so that the molding time is long. For this reason, conventionally, the injection molding method described in JP-A-63-3922 has attempted to shorten the molding time. In this injection molding method, a mold capable of holding pressure is attached to a die set device,
This die setting device is arranged around one injection molding machine. Then, while injecting the resin into the mold of one die setting device to maintain the pressure, and cooling the resin to the mold of the other die setting device, the cooling of one die setting device is performed. Has become.

[0003]

However, in the above-described conventional method, a large space is required for disposing the die setting device around the injection molding machine. Further, it is necessary to move the nozzle of the injection molding machine so as to face the die setting device, and there is a problem that the operation is wasteful and quick operation cannot be performed.

The present invention has been made in view of such a conventional problem, and has a simple structure, a relatively small size, a simple movement, and injection molding capable of rapid molding in a small space. The purpose is to provide a mold.

[0005]

Means for Solving the Problems To solve the above problems, the present invention has the following arrangement. That is, a plurality of injection units (mold units) capable of self-holding the mold clamping force with the molding machine platen open.
Are mounted on a slide plate (slide member) that moves vertically by a hydraulic cylinder at right angles to the platen movement direction. Further, the slide plate is provided with a notch for positioning a plurality of injection units at an injection position. On the other hand, on the movable side mounting plate, a slide plate positioning unit (locking member) in which a stopper and an actuator are connected by an elastic member, and a notch provided in the slide plate and the stopper are locked to position the injection unit. Is installed in a position where The stopper is
Position the mold unit against the notch on the slide plate
The upper support part to perform
Connect the lower contact part, the support part and the contact part
It is formed in a prismatic shape including an inclined portion. The actuator is connected to a control device having a sensor for detecting the position of the slide plate.

[0006]

According to the present invention, a control having a sensor for detecting a position of a slide plate when a plurality of injection units capable of self-holding the mold clamping force while the molding machine platen is opened moves after injection. The stopper is moved back and forth by the actuator connected to the device, and the stopper locks and unlocks the notch of the slide plate on which the plurality of injection units are mounted, thereby positioning the injection unit at the injection position. Is made.

[0007]

Embodiment 1 (Configuration) FIG. 1 shows Embodiment 1 of an injection mold according to the present invention. In the figure, reference numeral 1 denotes a fixed-side mounting plate, reference numeral 2 denotes a movable-side mounting plate, and reference numeral 3 denotes a slide plate. An injection unit 5 having a self-holding mechanism is mounted on the slide plate 3 by a support block 4. Further, the slide plate 3 is connected to a hydraulic cylinder 7 which is mounted on the movable side mounting plate 2 via a hydraulic cylinder mounting plate 6 and automatically stops oil supply when a predetermined pressure or more is generated. You can slide. A slide plate stopper 8 is attached to the lower end of the movable side mounting plate 2 to prevent the slide plate 3 from dropping. The injection unit 5 has a positioning hole 9,
Positioning pins 10 are provided on the fixed mounting plate 1, respectively. The positioning hole 9 and the positioning pin 1
The fitting of the “0” prevents the displacement of the fixed-side receiving plate 24 when the molded product is taken out.

Reference numeral 11 denotes a slide plate positioning unit, the details of which are shown in FIG. In the figure, reference numeral 12 denotes a fixed base, reference numeral 13 denotes an actuator which can move linearly and can position at least three points on a straight line, reference numeral 14 denotes a stopper, reference numeral 15 denotes a connecting bar stop, and reference numeral 16 denotes a connecting bar. I have. A spring 17 is interposed between the connecting bar stopper 15 and the connecting bar 16 so as to always contact both members. In addition, the slide plate 3 is provided with three cutout portions 18 that come into contact with the stoppers 14 so that the three injection units 5 can be positioned.

As shown in FIG. 3, the stopper 14 is a prism having an upper portion serving as a support portion 19 and a lower portion serving as an abutment portion 20 and having both surfaces connected by inclined portions 21. The width of the notch 18 is slightly larger than that of the stopper 14, and the upper part of the notch 18 and the support 19 of the stopper 14 come into contact with each other so that the injection unit 5 can be positioned. The actuator 13 is connected to a control panel (control device) 23 as shown in FIG.

Next, the configuration of the injection unit 5 having a self-holding mechanism will be described below. In FIG.
Reference numeral 25 denotes a fixed-side cavity unit, and reference numeral 81 denotes a movable-side cavity unit. A cavity 95 is formed between the fixed-side cavity unit 25 and the movable-side cavity unit 81. A ring-shaped rotating body 80 is mounted on the outer surface of the fixed-side receiving plate 24, and fixing arms 82 and 84 are mounted on the movable-side cavity unit 81 and the fixed-side mounting plate 1, respectively.

The rotating body 80 is rotatable about a shaft 85 provided on the fixed receiving plate 24. In order to rotate the rotating body 80, an actuator 86 is provided near the rotating body of the fixed-side receiving plate 24. The actuator 86 is rotated by a suitable means such as rolling contact and meshing.
The operation is performed in accordance with the control described later. In addition, arcuate engaging portions 87 are formed at equal intervals on the outer peripheral portion of the rotating body 80 at three locations, and a slit portion 88 is formed between the engaging portions 87. As a result, the engaging portion 87 and the slit portion 88 are located at the opposing portions with the shaft 85 therebetween, and the rotating body 8
0 rotates every 60 °.

The fixing arms 82 and 84 are connected to the rotating body 8.
The movable-side cavity unit 81 and the fixed-side mounting plate 1 are mounted at positions facing each other so as to be located on the same straight line as the shaft 85 of the zero. Each of the fixing arms 82 and 84 extends from the movable-side cavity unit 81 and the fixed-side mounting plate 1 in the direction of the rotating body 80, and has a rotating body 80
Hook portions 89 and 90 that are engaged with the engaging portions 87 of the respective members are formed. In this case, the fixing arms 82, 8
The width of 4 is smaller than the slit portion 88 of the rotating body 80, and each hook portion 89 and 90 can enter the inside of the rotating body 80 through the slit portion 88.

Reference numeral 91 denotes an elastic member such as a spring inserted between the fixed side cavity unit 25 and the fixed side receiving plate 24, and acts so that the fixed side cavity unit 25 comes into close contact with the movable side cavity unit 81. I do.
As a result, the elastic member 91 urges the movable side and the fixed side cavity units 81 and 25 in the mold clamping direction.

Further, an adjusting member 92 composed of a bolt is attached to the fixed side cavity unit 25.
The adjusting member 92 penetrates the fixed-side receiving plate 24 from the fixed-side cavity unit 25, and its head portion 92a is in contact with the fixed-side receiving plate 24. The screw length of the adjusting member 92 is adjusted such that a predetermined gap 93 is formed between the fixed-side cavity unit 25 and the fixed-side receiving plate 24 except that the mold clamping force is applied.

It is to be noted that the apparatus operates in a state where a gap 94 is formed between the fixed-side receiving plate 24 and the fixed-side mounting plate 1. In FIG. 4, reference numeral 96 denotes a guide pin, reference numeral 97 denotes a guide bush, and reference numeral 98 denotes a pressure sensor, and a signal from the pressure sensor is transmitted to the control device 99 so that the actuator 86 is controlled. ing.

(Operation) First, the injection unit 5A on the slide plate 3 performs injection. At this time, the support 19 of the stopper 14 is in contact with the notch 18A of the slide plate 3. Further, the contact portion 20 of the stopper 14 is retracted into the fixed base 12 so as not to contact the slide plate 3 (FIG. 5).

When the injection by the injection unit 5A is completed, the injection unit 5A is held by itself, while the slide plate 3 starts to rise to perform the injection of the injection unit 5B. At this time, the inclined portion 21 of the slide plate 3 and the stopper 14
, The stopper 14 is retracted (FIG. 6).

Further, when the slide plate 3 moves up and the notch 18B for determining the position of the injection unit 5B approaches the stopper 14, the connecting bar 16 connected to the actuator 13 moves forward (FIG. 7). In this state,
When the notch 18B comes to the stopper 14, the stopper 14 enters the notch 18B, and the lower portion of the notch 18B subsequently collides with the contact portion 20 of the stopper 14 (FIG. 8). Since the hydraulic cylinder 7 is turned off when the internal pressure rises to some extent, the supply of oil to the hydraulic cylinder 7 is stopped. As a result, the slide plate 3 descends, and the upper part of the notch 18B is brought into contact with the support 19 of the stopper 14 to determine the position (FIG. 9).

While the injection unit 5B is performing injection at this position, the connecting bar 16 is actuated by the actuator 13.
Is pulled, and the stopper 14 is retracted to the position shown in FIG. When the injection unit 5B is self-held after the injection, the mold is opened. After that, it moves from the injection unit 5B to the injection unit 5C in the same manner as it moves from the injection unit 5A to the injection unit 5B (FIG. 11).

In the case of the injection unit 5B, the stopper 14 is slid during molding so that the abutting portion 20 is
The stopper 14 is in the state shown in FIG. 11 until the molding machine platen (not shown) opens, but the stopper 14 is in the state shown in FIG. The stopper 14 is retracted by the actuator 14 to a position (FIG. 12) where the tip does not contact the slide plate 3.

Then, the slide plate 3 slowly descends while receiving the resistance of the oil in the hydraulic cylinder 7. When the notch 18B passes through the stopper 14, the connecting bar 16 is moved by the actuator 14 as shown in FIG.
Forward to the position. When the notch 18A comes to the stopper 14, the stopper 14 jumps into the notch 18A, and the support 19 of the stopper 14 and the notch 18A come into contact with each other. It is positioned (FIG. 14).

Thereafter, after the molded product is taken out, the slide plate 3 is moved upward through injection and self-holding.

During the above operation, the actuator 14
Is controlled by the control panel 23.

Next, the operation of the injection unit 5 having a self-holding mechanism will be described. In the state of FIG. 4, mold injection is performed by the molding machine (not shown) on the injection unit 5 at the injection position. At this time, the control device 9
9, a signal is transmitted to the actuator 9 and the actuator 86 rotates to rotate the rotating body 80 by 60 °. As a result, the hook portion 89 of the fixing arm 82 engages with the engagement portion 87,
When the molding machine platen is opened in this state, the fixing arm 84
The fixed-side cavity unit 25 and the fixed-side receiving plate 24 are supported by the movable-side cavity unit 81 by the fixing arm 82 because the hook portion 90 of the fixed portion is pulled out of the slit portion 88. At this time, since the pressing force is exerted by the elastic member 91, the fixed-side cavity unit 25 and the movable-side cavity unit 81 remain in close contact with each other. In this state, the movement is performed by the slide mechanism.

After cooling, the rotary body 80 is again moved to the injection position, and the molding machine is clamped. When the pressure sensor 98, the control device 99 and the actuator 86 rotate the rotary body 80 by 60 °,
As a result, the fixed-side cavity unit 25 and the fixed-side receiving plate 24 are supported by the fixed-side mounting plate 1. Thereafter, the molding machine platen is opened to take out the molded product.

(Effect) According to the first embodiment, the positioning of the slide plate 3 and thus the injection unit 5 can be reliably performed with a simple structure in which the stopper 14 is moved by the actuator 13. Further, since the stopper 14 does not move up after being retracted when the slide plate 3 is lifted, the stopper 14 escapes, so that the slide plate 3 is raised after releasing the stopper 14. No control by timing is required.

[0028]

Second Embodiment (Structure) FIG. 15 shows an injection molding die according to a second embodiment of the present invention. Hereinafter, only the differences between the second embodiment and the first embodiment will be described. The second embodiment is different from the first embodiment in that a fixed stopper 30 for applying the upper end of the slide plate 3 is attached to the hydraulic cylinder attachment plate 6 first. The actuator 13 is the same as that of the first embodiment.
In this case, at least three points must be able to be positioned, but in this embodiment, a small hydraulic cylinder 31 that reciprocates between two points is used as an actuator.

(Operation) At the start of molding, in the state shown in FIG. 16, the support portion 19 of the stopper 14 and the upper portion of the notch 18A are in contact with each other, and the injection unit 5A is positioned at the injection position. After the injection to the injection unit 5A is performed in this state, the injection unit 5A is held by itself and the platen of the molding machine (not shown) opens. Then, the slide plate 3 starts to rise by the hydraulic cylinder 7. At this time, the slide plate 3 comes into contact with the inclined portion 21 of the stopper 14, but the movement is not hindered because the stopper 14 is slidable.

The slide plate 3 is further raised, and the upper end of the slide plate 3 contacts the fixed stopper 30. At this time, the stopper 14 jumps into the notch 18C, but the stopper 14 is not in contact with the notch 18C (FIG. 1).
7). Here, when the hydraulic pressure of the hydraulic cylinder 7 is cut off, the upper part of the notch 18C comes into contact with the support 19 of the stopper 14, and the positioning of the injection unit 5C to the injection position is completed (FIG. 18).

After the injection, the injection unit 5C is held by itself, and a platen (not shown) opens. Next, the supporting portion 19 of the stopper 14 is moved by the small hydraulic cylinder 31 to the notch 1.
It can be lowered to a position where it does not come into contact with 8C. Then, the slide plate 3 starts to descend slowly while receiving the resistance of the oil in the hydraulic cylinder 7 (FIG. 19).

When the descent starts, the small hydraulic cylinder 3
1 advances the connecting bar 16 (FIG. 20). Further, the slide plate 3 continues to descend, and the stopper 14 jumps into the notch portion 18B, and the slide plate 3 stops when the upper portion of the notch portion 18B comes into contact with the support portion 19 of the stopper 14. This completes the positioning of the injection unit 5B to the injection position (FIG. 21).

After the injection, the injection unit 5B is held by itself, and a platen (not shown) opens. Thereafter, the slide plate 3 is lowered and the injection unit 5A is positioned at the injection position by the same operation as when the injection unit 5C at the injection position is replaced with the injection unit 5B. afterwards,
After the molded product is taken out, the molding is continuously performed by repeating the above steps.

(Effects) According to the second embodiment, the slide plate 3 is raised at a stretch and then lowered sequentially, and furthermore, the fixed stopper 3
By providing 0, the hydraulic pressure or the air cylinder capable of reciprocating the actuator 13 can be used, and as a result, control becomes easy.

[0035]

Third Embodiment (Structure) FIGS. 22 and 23 show an injection molding die according to a third embodiment of the present invention. FIG. 23 shows FIG.
FIG. 4 is an enlarged detailed view of a region circled by. Hereinafter, only the differences between the third embodiment and the first embodiment will be described. In this embodiment, the first (and second) moving the stopper 14 is performed.
The ejection mechanism of the molding machine 60 is used instead of the actuator 13 of the embodiment. Therefore, the slide plate positioning unit 11 of the first (and second) embodiment is embedded in the movable side mounting plate 2. Further, the stopper 14 operates in the same direction as the opening and closing direction of the platen 61.

In FIG. 23, reference numeral 40 denotes an ejector rod, reference numeral 41 denotes a second ejector plate, and a second ejector rod 42 is attached to the second ejector plate 41, and the second ejector rod 4
2 is slidable by a guide bush 43. The second ejector plate 41 is normally pressed against a plate stopper 45 by a second coil spring 44. The ejector plate 46 of the injection unit 5 has a third
An ejector rod 47 is attached. The connecting bar 16 between the stopper 14 and the ejector rod 40 is provided with a disk 48 for pressing the second ejector plate 41. Further, a relief hole 50 is provided in the second ejector plate 41 so as not to interfere with the guide portion 49 of the stopper 14.

The spring 17 has a spring constant that does not move the stopper 14 during ejection. The vertical movement of the injection unit 5 is performed by a hydraulic cylinder 7 connected to the slide plate 3.

(Operation) A series of movements of the stopper 14 when positioning the injection unit 5 is performed by an eject mechanism instead of the actuator 13 of the first embodiment. Further, a series of movements of the connecting bar 16 are performed by moving the ejector rod 40 as in the actuator 13 of the first embodiment. In addition, the ejector rod 40
, The connecting bar 16 advances, but since the ejector rod 40 advances only before the disk 48 hits the second ejector plate 41, the molded product is ejected when the connecting bar 16 is moved. There is no (FIG. 23).

When the molded product 52 is pushed out by the ejector mechanism, after the PL surface 51 of the injection unit 5 is opened (FIG. 24), the ejector rod 4 is further moved compared to the state shown in FIG.
Extrude 0. Then, the disk 48 of the connecting bar 16 becomes the second
The ejector plate 41 is projected, and the molded product 52 is projected. At this time, since the spring constant of the spring 17 is sufficiently small, the frictional force of the slide plate 3 pressing the stopper 14 is stronger, and the stopper 14 does not move forward (FIG. 24).

(Effect) According to the third embodiment, since the stopper 14 is moved by using the ejector mechanism, it is not necessary to attach the actuator 13, so that the processing time is reduced and the cost is reduced.

[0041]

As described above, according to the present invention, since the structure is simple, the size is relatively small, and the movement is simple, automation can be easily achieved, and rapid molding in a narrow space is possible. Become.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a main part according to a first embodiment of the present invention.

FIG. 2 is a view showing a slide plate positioning unit according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a part of a stopper according to the first embodiment of the present invention.

FIG. 4 is a view showing an injection unit according to the first embodiment of the present invention.

FIG. 5 is a diagram for illustrating an operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating an operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 7 is a diagram illustrating the operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 8 is a diagram illustrating the operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 9 is a diagram for illustrating the operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 10 is a diagram illustrating an operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 11 is a diagram illustrating an operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 12 is a diagram illustrating the operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 13 is a diagram illustrating the operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 14 is a diagram illustrating the operation of the slide plate positioning unit according to the first embodiment of the present invention.

FIG. 15 is a view showing a slide plate positioning unit in Embodiment 2 according to the present invention.

FIG. 16 is a diagram for illustrating the operation of the slide plate positioning unit according to the second embodiment of the present invention.

FIG. 17 is a diagram illustrating an operation of a slide plate positioning unit according to the second embodiment of the present invention.

FIG. 18 is a diagram illustrating an operation of a slide plate positioning unit according to the second embodiment of the present invention.

FIG. 19 is a diagram for illustrating the operation of the slide plate positioning unit according to the second embodiment of the present invention.

FIG. 20 is a diagram illustrating an operation of a slide plate positioning unit according to the second embodiment of the present invention.

FIG. 21 is a diagram illustrating an operation of a slide plate positioning unit according to the second embodiment of the present invention.

FIG. 22 is a diagram showing a third embodiment according to the present invention.

FIG. 23 is a diagram illustrating an ejector mechanism according to a third embodiment of the present invention.

FIG. 24 is a diagram illustrating an operation of an ejector mechanism according to the third embodiment of the present invention.

[Explanation of symbols]

 2 Movable mounting plate 3 Slide plate (slide member) 5 Injection unit (mold unit) 7 Hydraulic cylinder 11 Slide plate positioning unit (locking member) 13 Actuator 23 Control panel (control device)

──────────────────────────────────────────────────続 き Continued on the front page (72) Hiroshi Yonekubo, Inventor Hiroshi Yonebo 2-43-2, Hatagaya, Shibuya-ku, Tokyo Inside O-Limpus Optical Industrial Co., Ltd. (72) Inventor Shozo Nishida 1-6, Funakoshi-minami, Aki-ku, Hiroshima No. 1 Inside Japan Steel Works, Ltd. (56) References JP-A-3-193323 (JP, A) JP-A-5-24067 (JP, A) JP-A-4-115911 (JP, A) JP-A-63 -60723 (JP, A) JP-A-5-74821 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45/80 B29C 33/30 B22D 17/22

Claims (2)

(57) [Claims] 1. A plurality of mold units each having a mechanism for self-holding a mold clamping force are mounted vertically and a position
A notch for determination is formed.
A slide member mounted to be reciprocally movable in
A hydraulic cylinder for moving the slide member in the reciprocating direction; and a stopper for moving the slide member in a direction perpendicular to the reciprocating direction of the slide member to engage with the notch.
A locking member having a notch.
Upper support for positioning the mold unit by contacting the
Holding part and lower contact part that is retracted below this support part
And an inclined portion that connects the support portion and the contact portion.
The stopper and the actuator
An injection molding die , wherein an elastic member is disposed between the injection molding die and the eta . 2. A plurality of mold units each having a mechanism for self-holding a mold clamping force are mounted on the upper and lower sides and positioned.
A notch for determination is formed.
A slide member mounted to be reciprocally movable in
A hydraulic cylinder for moving the slide member in the reciprocating direction, and a molding machine ejector mechanism for moving the slide member at right angles to the reciprocating direction of the slide member to engage the notch.
A locking member having a stopper.
When positioning the mold unit against the notch
And the lower part of the support
Attachment part, inclined part connecting the support part and the contact part
The stopper is shaped like a prism.
An injection molding die , wherein an elastic member is disposed between the mold and the actuator .