JPH0872111A - Mold locking device - Google Patents

Abstract

PURPOSE: To safely remove a molding without breaking a mold locking device by a simple structure by a method wherein a permanent magnet is mounted on a parting surface of either a movable retainer plate or a stationary retainer plate as a means for pulling the stationary retainer plate to the movable retainer plate at the time of opening a three-plate mold. CONSTITUTION: In a mold locking device of a three-plate mold, a permanent magnet 15 is fixed to a parting surface of either a movable retainer plate 10 or a stationary retainer plate 5 by bolting, adhesion, welding, or the like as a means for pulling the stationary retainer plate 5 to the movable retainer plate 10 at the time of opening the mold. When a movable die plate is opened, the stationary retainer plate 5 is also moved separately from an intermediate plate 4. A stopper pin 6 is connected, whereby after the intermediate plate 4 is also moved, the stationary retainer plate 5 and the intermediate plate 4 are abutted on the stopper pin 6 and stopped. After that, the movable retainer plate 10 continues to open to a predetermined position. In this manner, the permanent magnet 15 is prevented from being damaged and can be mounted without paying much attention to a mounting position and a dimensional accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold locking device for injection molding.

[0002]

2. Description of the Related Art Conventionally, a three-plate mold for injection molding is used to open a mold by moving a movable die block with respect to a fixed die block in order to take out a molded article as well known. As means for pulling the fixed-side template by the movable-side template, the locking part piece of the locking member fixed to the outside of either the movable-side template or the fixed-side template is The one that is inserted into the insertion hole of the locking plate attached to the outside is used. In addition, in a three-plate mold using a stripper plate, since the stripper plate itself is movable, a locking member fixed to the outside of either the fixed side template or the stripper plate is attached to the outside of the other. A stop plate is attached, and a locking member fixed to either the outer side of the stripper plate or the movable side mold plate, and a locking plate also on the other side of the stripper plate are attached. It was attached to the outside of the block. In addition, a conventional interlock mechanism or a mold locking device for a three-plate mold that uses a slide retainer has an interlock mechanism or
It was manufactured as a separate part from the slide retainer, and attached and used separately.

[0003]

The conventional method has the following drawbacks. (1) Whenever the mold is opened or closed, friction occurs between the locking part of the locking member and the insertion hole of the locking plate on the outside of the die block, which damages the locking part and the bolt. Or, the locking plate was bent, causing a big trouble. (2) The locking member and the locking plate must be mounted extremely accurately, and if there is an error in the mounting position, the bolt may be damaged or the template may not operate properly, causing damage to the mold. (3) In the three-plate mold using the stripper plate, the distance between the mounting hole of the locking member and the mounting hole of the locking plate is short, which is why the double mold locking device is mounted on the outside of the die block. If the pulling force of the mold locking device outside the fixed side mold plate and the outside of the stripper plate and the mold locking device outside the stripper plate and outside of the movable side mold plate are the same, the fixed side While pulling the mold plate with the movable die block, the stripper plate and the movable mold plate often open while the fixed mold plate and the stripper plate remain in contact with each other. The product will remain stuck in the cavity, which may cause the mold to malfunction, and may damage the product part of the mold to take out the molded product or damage the mold. It was Therefore, the pulling force of the mold locking device on the outside of the stripper plate and the mold locking device on the outside of the movable side plate must be greater than that of the mold locking device on the outside of the fixed side mold plate and on the outside of the stripper plate. Therefore, when ejecting the stripper plate, an excessive force is applied to the ejector pin, which causes breakage of the ejector pin and warp or damage of the stripper plate. (4) Interlock mechanism or slide retainer and 3
If the mold locking devices for the single plate mold are separately manufactured, it takes time and labor for processing, leading to a high cost of the mold, which is also a cause of delay in delivery of the mold. As described above, the conventional members have many problems such as processing, cost, and service life.

In view of the above-mentioned conventional drawbacks, the present invention has been made.
The mold lock device is not damaged, and the molded product can be safely taken out even with a three-plate mold using a stripper plate, and it can also be used as a mold lock device for the interlock mechanism or slide retainer. It is an object of the present invention to provide a die lock device which is easy to manufacture and easy to assemble because it is simple and inexpensive.

[0005]

In order to achieve the above-mentioned object, the present invention provides a movable plate as a means for pulling a fixed mold plate when a three-plate mold is opened. A mold locking device is constructed by attaching permanent magnets from opposite mold dividing surfaces of either the side mold plate or the fixed side mold plate.

[0006]

The mold locking device for the three-plate mold constructed as described above has a fixed-side mold fixed to the movable-side mold plate by exciting the magnet as the movable-side die block moves during opening of the mold for injection molding. While the plates are still in contact, the movable-side mold plate pulls the fixed-side mold plate to a predetermined position.

[0007]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

First Embodiment A first embodiment will be described with reference to FIGS. 1 to 11. In the die lock device of the three-plate die of the first embodiment, in the fixed side die block 1, the support pins 3 protruding from the fixed side attachment plate 2 are freely inserted into the intermediate plate 4 and the fixed side die plate 5. It is constituted by a stopper pin 6 that regulates the movement of the fixed-side template 5. As shown in FIGS. 1 to 3, the movable die block 7 includes a movable die block 7 that does not use a stripper plate 8 (hereinafter referred to as “normal type”), and a stripper plate 8 as shown in FIGS. 4 to 7. Movable side die block 7
(Hereinafter referred to as "stripper plate type"). The normal type movable die block 7 is
The guide pins 11 projecting from the movable-side mold plate 10 fixed by a plurality of bolts (not shown) in the movable-side mount plate 9 can be freely inserted into the fixed-side mold plate 5. There is an ejector plate 12 in the die block 7, and ejector pins 13 projecting from the ejector plate 12 are freely inserted into the movable side mold plate 10,
The tip of a fixed lot from the molding machine faces a through hole (not shown) formed in the center of the movable side mounting plate 9.
Further, as an example of a stripper plate type, the movable die block 7 includes a guide pin 11 projecting from a movable die plate 10 fixed by a plurality of bolts (not shown) in a movable attachment plate 9. , Stripper plate 8
And the fixed side mold plate 5 can be freely inserted, and the movable side die block 7 has an ejector plate 12, and the ejector pin 13 protruding from the ejector plate 12 is fixed by a bolt 14 in the stripper plate 6. A fixed lot (not shown) from the molding machine faces the through hole (not shown) formed in the center of the movable side mounting plate 9 which is fixed. In the mold locking device for the three-plate mold having the above-described structure, when the mold is opened during injection molding,
As a means for pulling the fixed-side mold plate 5 to the movable-side mold plate 10, in the normal type, a permanent magnet 15 is bolted from either of the movable-side mold plate 10 and the fixed-side mold plate 5 which face each other. It is fixed and attached by the joining member 17 such as adhesion, welding, or the like. Further, in the stripper plate type, the permanent magnet 15 is surrounded by a non-magnetic material 16 such as synthetic resin, aluminum, brass or the like in order to magnetically cut off the permanent magnet 15 and the metal mold, and bolts, adhesion, welding, etc. Joining member 17
The non-magnetic body 16 surrounding the permanent magnet 15 is fixed by a, and the non-magnetic body 16 surrounding the permanent magnet 15 is bonded to one of the movable side mold plate 10 and the fixed side mold plate 5 by a joining member such as bolts, adhesion, and welding. It is desirable to attach at 17. Further, as shown in FIGS. 6 and 7, the permanent magnet 15 surrounded by the stripper plate type non-magnetic material 16 is provided with a movable side mold plate 10 or a fixed side via an adjusting plate 18 made of iron, aluminum, copper or the like. You may fix and attach with the bolt 19 from the mold division surface which either one of the mold plate 5 opposes. When the mold is closed, the fixed-side mold plate 5 and the movable-side mold plate 10 are in contact with each other while the permanent magnet 15 is excited. In this state, when the movable-side base plate (not shown) of the injection molding machine moves to the left, the permanent magnet 15 is excited, so that the fixed-side mold plate 5 also moves, as shown in FIGS. 8 and 9. Intermediate plate 4
And moves to the left, the intermediate plate 4 also moves to a predetermined position by connecting the stopper pin 6 at a predetermined position, and the fixed-side mold plate 5 and the intermediate plate 4 move to the stopper pin 6.
Abut and stop. The movable mold plate 10 is opened to a predetermined position even after the fixed mold plate 5 is stopped. When the mold is opened in this way, the core pin 20 and the stripper plate 8 project due to the projection of the fixed lot (not shown) from the molding machine, and the molded product is on the movable side, as shown in FIGS. 8 and 9. It is removed from the space between the template 10 and the fixed-side template 5. After that, the mold is closed again and this is repeated. In the mold locking device described above, the permanent magnet 15 and the attracted surface do not have to contact each other, so the permanent magnet 15 is not damaged or damaged, and the mounting position and the dimensional accuracy are different.
Since it is good within the range where the magnetic force of (3) works, processing can be performed without much concern for the position and accuracy. Further, even in a normal type or stripper plate type three-plate mold, since the permanent magnet 15 is attached only to one of the movable side mold plate 10 and the fixed side mold plate 5, it functions as a mold locking device. It has a simple structure and can be easily installed by anyone, and at a low cost. In addition, by attaching the adjusting plate 18,
The dimensions can be adjusted according to the thickness of the stripper plate 8. Further, since it is the permanent magnet 15, it can be used semi-permanently, and since the mold can be opened surely, it is possible to perform efficient and smooth molding without damaging the mold.

Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. 12 to 15. For the sake of convenience of explanation, the same members as those shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof is omitted. The mold locking device for the three-plate mold according to the present embodiment pulls the movable side mold plate 10 to a predetermined position while keeping the fixed side mold plate 5 in contact with the movable side mold plate 10 when the mold is opened during injection molding. As means for this, a permanent magnet 15 is fixed and attached by a joining member 17 such as bolts, adhesion, welding, etc. from the inner facing mold division surface of either the movable side mold plate 10 or the fixed side mold plate 5, The attracted bodies 21 corresponding to the permanent magnets 15 are fixed by bolts from the opposite inner mold dividing surfaces on the other side. Further, the iron mold encloses the permanent magnet 15 and the attracted body 21 with a non-magnetic body 16 such as synthetic resin, aluminum, brass or the like in order to magnetically shield these from the mold. You may attach it. The die lock device described above can be used as a die lock device for a non-magnetic three-plate die such as an aluminum die.

Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. 16 and 17. For the sake of convenience of explanation, the same members as those shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof is omitted. As a measure against undercuts and lateral holes in the product part, in the mold locking device of the three-plate mold that uses the slide 22, when opening the mold for injection molding,
As a means for pulling the fixed-side mold plate 5 to a predetermined position while keeping the movable-side mold plate 10 in contact with the movable-side mold plate 10, the movable-side mold plate 10 or the fixed-side mold plate is used to suppress the movement of the slide 22. The permanent magnets 15 are fixed and attached in the slide retainers 23 projected on the opposing mold dividing surfaces of the plate 5 with the joining members 17 such as bolts, adhesion, and welding. The die lock device described above can be used in combination with the die lock device and the slide retainer 23 by mounting the permanent magnet 15 in the slide retainer 23.

Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIGS. 18 to 23. For the sake of convenience of explanation, the same members as those shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof is omitted. As a means for preventing displacement due to expansion of the mold due to injection pressure of injection molding, a three-plate mold using an interlock mechanism 24 from the joint surface of the movable side mold plate 10 and the fixed side mold plate 5 is used. In the mold lock device, when the mold is opened for injection molding, the movable side mold plate 1
As a means for pulling the fixed-side mold plate 5 to 0 to a predetermined position with the fixed-side mold plate 5 kept in contact, the permanent magnet 15 is attached to the inside of either the convex portion 25 or the concave portion 26 of the interlock mechanism 24 by bolting or bonding. , And fixedly attached by the joining member 17 such as welding. The mold lock device described above can be used in combination with the mold lock device and the interlock mechanism 24 by mounting the permanent magnet 15 inside one of the convex portion 25 and the concave portion 26 of the interlock mechanism 24. You can

Fifth Embodiment A fifth embodiment of the present invention will be described with reference to FIGS. For the sake of convenience of explanation, the same members as those shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof is omitted. As a mold locking device for a three-plate mold, a permanent magnet 15 used to pull a fixed-side mold plate 5 to a predetermined position while keeping the movable-side mold plate 10 in contact with the movable-side mold plate 10 at the time of opening the mold for injection molding. In order to prevent a failure due to magnetic leakage to a place that does not require magnetism, the permanent magnet 15 is made of a non-magnetic material 16 such as synthetic resin, aluminum or brass.
Enclosed by a joint member 17 such as bolts, adhesion, and welding
The non-magnetic body 16 which is fixed by a and surrounds the permanent magnet 15 is fixed and attached to the mold by a joining member 17 such as a bolt, an adhesive, or a welding. In the mold lock device described above, the permanent magnet 15 is surrounded by the non-magnetic body 16 to thereby make the permanent magnet 1
It is possible to prevent the mold operation from being disturbed by the magnetic leakage of item 5.

Sixth Embodiment A sixth embodiment of the present invention will be described with reference to FIGS. 32 to 41. For the sake of convenience of explanation, the same members as those shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof is omitted. The permanent magnet 15 rotatably provided in the magnetic circuit blocks 27 and 27a is magnetized by the rotation of the permanent magnet 15.
8. A detachable mechanism in a die lock device of a three-plate die in which a permanent magnet 30 with an attachable / detachable mechanism that can be detachably attached to a demagnetizer 29 is fixed to the die by bolts, adhesion, welding, or the like. Using the attached permanent magnet 30 in the state of being magnetized 28, the movable side mold plate 10
The fixed-side mold plate 5 is pulled to a predetermined position while being in contact with the fixed-side mold plate 5. In addition, the permanent magnet 30 with the attaching / detaching mechanism is magnetized 2
When the work is hindered by 8, the permanent magnet 15 is turned from the outside of the mold by a turning handle 31 such as a wrench or a screwdriver to be in the demagnetized state 29, and the permanent magnet 15 is magnetized as necessary. 28 and demagnetization 29 are used by rotating. The die lock device described above is provided with a permanent magnet 3 with an attaching / detaching mechanism.
By magnetizing 0, it can be used as a mold lock device, and by demagnetizing 29,
The permanent magnet 15 can be used with the permanent magnet 15 attached, without hindering operations such as disassembling and assembling the mold that do not require the magnetic force of the permanent magnet 15.

[0014]

As is clear from the above description, the present invention has the following effects. (1) Since the permanent magnet does not have to contact the attracted surface, the permanent magnet is not damaged or damaged. (2) The permanent magnet mounting position and dimensional accuracy do not need to be detailed, and can be easily processed. (3) Even in the normal type and stripper plate type three-plate molds, the permanent mold magnets can be attached to only one of the movable side mold plate and the fixed side mold plate to serve as a mold lock device. It's easy and cheap. (4) A permanent magnet surrounded by a non-magnetic material can be used as it is by using an adjusting plate that adjusts the difference in the thickness of the stripper plate depending on the mold, depending on the thickness of the stripper plate. (5) Since it is a permanent magnet, it can be used semi-permanently and can reliably open the mold, so efficient and smooth molding can be performed without damaging or damaging the mold. You can (6) By providing a permanent magnet and an attracted body corresponding to the permanent magnet, it can be used as a die lock device for a non-magnetic three-plate die such as an aluminum die. (7) By attaching a permanent magnet to the slide retainer, the die lock device and the slide retainer can be used in combination, so that it is possible to reduce processing and delivery time and cost. (8) By attaching permanent magnets to the convex parts or concave parts of the interlock mechanism, the mold locking device and the interlock mechanism can be used together, so that processing, delivery time, and cost reduction can be achieved. You can (9) By surrounding the permanent magnet with a non-magnetic material,
It is possible to prevent the mold operation from being disturbed due to the magnetic leakage of the permanent magnet. (10) By magnetizing the permanent magnet with an attaching / detaching mechanism, it can be used as a mold lock device, and by demagnetizing, the work that does not require magnetic force can be prevented while the permanent magnet is attached. It can be used without becoming.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a partially sectional front view showing the first embodiment of the present invention.

FIG. 3 is a partially sectional front view showing the first embodiment of the present invention.

FIG. 4 is a partially sectional front view showing the first embodiment of the present invention.

FIG. 5 is a partially sectional front view showing the first embodiment of the present invention.

FIG. 6 is a partially sectional front view showing the first embodiment of the present invention.

FIG. 7 is a partially sectional front view showing the first embodiment of the present invention.

FIG. 8 is a cross-sectional view showing an operation mode of Embodiment 1 of the present invention.

FIG. 9 is a cross-sectional view showing an operating mode of Embodiment 1 of the present invention.

FIG. 10 is a cross-sectional view showing an operating mode of Embodiment 1 of the present invention.

FIG. 11 is a sectional view showing an operating mode of Embodiment 1 of the present invention.

FIG. 12 is a partially sectional front view showing a second embodiment of the present invention.

FIG. 13 is a partially sectional front view showing a second embodiment of the present invention.

FIG. 14 is a partially sectional front view showing a second embodiment of the present invention.

FIG. 15 is a partially sectional front view showing a second embodiment of the present invention.

FIG. 16 is a sectional view showing Embodiment 3 of the present invention.

FIG. 17 is a sectional view showing Embodiment 3 of the present invention.

FIG. 18 is a partially sectional front view showing Embodiment 4 of the present invention.

FIG. 19 is a partially sectional front view showing Embodiment 4 of the present invention.

FIG. 20 is a partially sectional front view showing Embodiment 4 of the present invention.

FIG. 21 is a partially sectional front view showing Embodiment 4 of the present invention.

FIG. 22 is a perspective view showing Embodiment 4 of the present invention.

FIG. 23 is a perspective view showing Embodiment 4 of the present invention.

FIG. 24 is a perspective view showing Embodiment 5 of the present invention.

FIG. 25 is a perspective view showing Embodiment 5 of the present invention.

FIG. 26 is a perspective view showing Embodiment 5 of the present invention.

FIG. 27 is a perspective view showing Embodiment 5 of the present invention.

FIG. 28 is a partially sectional front view showing Embodiment 5 of the present invention.

FIG. 29 is a partially sectional front view showing Embodiment 5 of the present invention.

FIG. 30 is a sectional view showing Embodiment 5 of the present invention.

FIG. 31 is a partially sectional front view showing Embodiment 5 of the present invention.

FIG. 32 is a partially sectional front view showing Embodiment 6 of the present invention.

FIG. 33 is a partially sectional front view showing Embodiment 6 of the present invention.

FIG. 34 is a sectional view showing Embodiment 6 of the present invention.

FIG. 35 is a partially sectional front view showing Embodiment 6 of the present invention.

FIG. 36 is a partially sectional front view showing Embodiment 6 of the present invention.

FIG. 37 is a partially sectional front view showing a sixth embodiment of the present invention.

FIG. 38 is a partially sectional front view showing Embodiment 6 of the present invention.

FIG. 39 is a sectional view showing Embodiment 6 of the present invention.

FIG. 40 is a partially sectional front view showing Embodiment 6 of the present invention.

FIG. 41 is a front view showing Example 6 of the present invention.

FIG. 42 is a partially sectional front view of a conventional mold lock device.

FIG. 43 is a side view showing a state in which a conventional mold locking device is attached to a mold.

FIG. 44 is a side view showing a state in which a conventional mold locking device is attached to a mold.

[Explanation of symbols]

1: Fixed side die block, 2: Fixed side mounting plate,
3: Support pin, 4: Intermediate plate, 5:
Fixed side mold plate, 6: Stopper pin, 7: Movable side die block, 8: Stripper plate,
9: Movable side mounting plate, 10: Movable side template, 1
1: guide pin, 12: ejector plate, 13: ejector pin, 14: bolt, 1
5: Permanent magnet, 16: Non-magnetic material, 17: Joining member, 17a: Joining member, 18: Adjusting plate, 19: Bolt, 20: Core pin,
21: object to be adsorbed, 22: slide,
23: slide retainer, 24: interlock mechanism,
25: convex part, 26: concave part, 27: magnetic circuit block, 27a: magnetic circuit block, 28:
Magnetization, 29: Demagnetization, 30: Permanent magnet with attachment / detachment mechanism, 31: Rotating handle, 32: Non-magnetic spacer, 33: Locking member, 34:
Locking plate, 35: locking piece, 36: insertion hole.

Claims (6)

[Claims] 1. As a means for pulling a fixed-side template to a movable-side template when the three-plate mold is opened, either the movable-side template or the fixed-side template is opposed to the mold. A mold locking device for injection molding, characterized in that a permanent magnet is attached from the mold dividing surface. 2. As a means for pulling the fixed-side template to the movable-side template when the three-plate mold is opened, a relative position inside one of the movable-side template and the fixed-side template. A die lock device for injection molding, wherein a permanent magnet is attached from a die dividing surface to be attached, and an attracted body corresponding to the permanent magnet is attached from an opposing die dividing surface on the other side. 3. A slide retainer is used on the opposing mold dividing surfaces of either the movable side mold plate or the fixed side mold plate.
The single plate mold is a mold locking device for injection molding, wherein a permanent magnet is attached inside the slide retainer. 4. A three-plate mold that uses an interlock mechanism from the joint surface of a movable side mold plate and a fixed side mold plate, wherein a permanent magnet is provided inside either the convex portion or the concave portion of the interlock mechanism. A mold locking device for injection molding, characterized by being attached. 5. The mold lock device according to claim 1, wherein the permanent magnet is surrounded and attached by a non-magnetic material. 6. The mold lock device according to claim 1, wherein the permanent magnet is a permanent magnet with a magnetic force attaching / detaching mechanism.