JPS62292250A - Insert fixing apparatus for forming die - Google Patents

Abstract

PURPOSE:To prevent the movement or fall-out of an insert by forming a core pin arranging the insert at tip part facing in the cavity of dies with a magnetic body contacting with the insert at this partial and a nonmagnetic body inserting an electromagnetic coil into the outer circumferential part at the circumference of magnetic body. CONSTITUTION:The insert 25 is inserted into the tip part of bobbin 24a of the core pin 24 under die opening condition as moving a movable platen 5 to backward, and the current is conducted in the electromagnetic coil 2. In this way, magnetic flux is formed among the core 24a, by-pass pin 26, insert 25 and movable insert 10 as magnetized material, to magnetize, and the insert 25 is attracted to a core 10a and the core 24a to fix strongly. Next, by moving the platen 5 to forward, to close the dies, the core 10a is faced to the recess part 9a to form a cavity 11. In succession, molten metal 19 is supplied from a pouring hole 17a of injection sleeve 17 and by moving a plunger tip 18 to forward, the molten metal 19 is injected into the cavity 11 through a sprue 14, runner 15 and gate 16.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field] The present invention is a die casting machine, a plastic injection molding machine, etc., in which an insert inserted into a molding die and simultaneously molded is injected. This invention relates to an insert fixing device for fixing a molding insert to prevent it from falling off from a fitting part that moves during molding.

[Conventional technology]

Injection molding using die casting machines, plastic injection molding machines, etc., involves injecting molten resin into the cavity of a mold, and obtaining an injection molded product through assimilation. For example, inserts shaped like rings or semicircular arcs for round bearings are often fitted into the mold protrusion or core pin facing into the mold cavity, and then molded at the same time as the injection molded product. It will be done.

[Problem that the invention seeks to solve]

However, in injection molding in which inserts are inserted and molded at the same time, the inserts may move due to vibrations of the machine during mold clamping or the flow of molten material injected into the cavity during molding. When the insert is facing downward, the insert may fall into the cavity, resulting in defective molded products, and also poses an obstacle to automation and rationalization.

[Means for solving problems]

In order to solve these problems, in the present invention, the core pin, on which the insert is attached to the tip facing into the mold cavity, is made of a magnetic material in the center part of which is partially in contact with the insert.
It was formed with a surrounding non-magnetic material, and an electromagnetic coil was fitted around the outer periphery of the non-magnetic material.

[Effect]

When the insert is attached to the core bin, the electromagnetic coil is energized, the mold is clamped and molded, the magnetic material and the insert become magnetized and attract each other, and the insert is firmly fixed to the core bin. At the same time, the magnetic flux is caused by the magnetic material of the core bottle,
The magnetic field is efficiently transmitted between the insert and the metal to form a closed magnetic field.

〔Example〕

1 to 3 show an example in which the insert fixing device for a molding hardware according to the present invention is implemented in a die casting machine with a horizontal casting machine, and FIG. Cross-sectional view, Figure 2 is an enlarged cross-sectional view of the core bottle,
FIG. 3 is a partially cutaway schematic side view of a die casting machine embodying the present invention. In the figure, the die casting machine 1 is
The machine is equipped with a stationary platen (not shown) and a stationary platen (not shown) and a stationary platen 4 that stands upright on the machine base 2 and is connected at its four corners with tie bars 3. A movable platen 5 that moves forward and backward relative to the fixed platen 4 is supported. Fixed platen 4 has fixed money! A movable mold T is attached to the movable platen 5 via a die plate 8. In the concave holes of the fixed mold ms and the movable mold 7, there is a fixed mold S and a movable mold 1.
G are inserted into each of these nests 8.1.
A hollow recess 9a and a core 101 are respectively formed in the mold 0, and the recess 9a and the core 1 are formed in the clamped state shown in FIG.
A cavity 11 is formed between 0m and 0m. 12
A fixed sleeve that is fitted into the sleeve hole of the wire fixed insert 9 and has a tapered inner hole, and a cylindrical member 13 that is fitted into the inner hole of the movable insert 10 and has a nine taper.
is involved during mold clamping, and due to this involvement, the sprue 14
is formed. 15 and 16 are launches and gates formed between the sprue 14 and the cavity 11.

Furthermore, a cylindrical injection slot portion 1T equipped with a pouring port t7m is fitted into the sleeve hole of the fixed platen 4 and the fixed mold 1 on the same axis as the fixed sleeve 12), and the inner hole thereof is fitted. Plunger tip 1 of the injection cylinder (not shown)
8 are fitted so that they can move forward and backward. ζIt's better to do it,
When the molten metal 19 is supplied from the spout 171 and the plunger tip 18 is advanced, the molten metal 19 flows from the injection sleeve 1T through the sprue 14, runner 15, and gate 16 into the cavity 1.
1 and solidified to obtain a cast product as an injection molded product. On the other hand, a support plate 2 that moves forward and backward by an extrusion cylinder (not shown) is inserted into the bottle hole provided in the movable platen 5.
A support pin 21 integral with the pin 0 is engaged, and an extrusion plate 23 having a plurality of extrusion pins 22 is fixed to the tip thereof. Then, the extrusion bottle 22 passes through the expandable metal shell 7 and the movable nest 10 to reach the cavity 11, and
After the movable platen 5 is moved back and the mold is opened as shown in FIG. 3, the extrusion pin 22 is advanced by the extrusion cylinder, thereby extruding the cast product in the cavity 11.

In the die casting machine 1 configured in this manner, an insert is inserted into the cavity 11 to be molded simultaneously with the molded product. That is, a core bin 24 is fitted into a pin hole formed in the movable nest 10, and the core bin 24 is made of magnetic hot work tool steel as a magnetic material. A central core 241 formed in a cylindrical shape with a flange, and a bobbin formed in a cylindrical shape with a flange made of non-magnetic hot work tool steel as a non-magnetic material and fitted onto the outer periphery of the core 24m. 24b.

The insertion end of the core bin 24 faces into the cavity 11 when the mold is clamped, and in this embodiment, a ring-shaped insert 25 is fitted into this end during molding. be done. Reference numeral 26 denotes a plurality of bypass bins made of a magnetic material that protrude radially from the tip of the core 24& through the bobbin 24b, and include the insert 25, the core 24m,! :: These are connected magnetically by contacting. An annular groove 24 provided on the outer periphery of the bobbin 24
An electromagnetic coil 27 connected to a power supply (not shown) with a lead wire is installed in C. When this is energized, a magnetic flux is formed, and the magnetic flux is transferred to the core 241-no (Ipass pin 28- A closed magnetic field is formed between the core 10 and the collar of the core 241, and the insert 25 is connected to the core 10 m.
The o2B, which is configured to be attracted to the Oyohi bypass bin 26, is installed in the core 24m. It is a cooler for coil water cooling, and 29 is an air passage 10b that communicates with the electromagnetic coil 2T. O is a hose that sends air to the electromagnetic coil 27 to prevent the intrusion of water.The injection operation of the die-casting machine configured as described above will be explained.In the mold open state with the movable platen 5 retracted, the insert 25 is inserted into the bobbin 24 and the tip of the core bin 24, and the electromagnetic coil 27 is energized.
5 and the movable insert 10 and are magnetized, the insert 25 is attracted to the core 10M and the core 24m and is firmly fixed. When the movable platen 5 is moved forward, the mold is clamped and the core 10m is inserted into the recess 9& to form the cavity 11. Molten metal 19 is supplied from the pouring port 17m of the injection sleeve 17 to form the plunger tip. When the movable platen 5 is moved forward, the molten metal 19 is injected into the cavity 11 through the sprue 14, runner 15, and gate 16.0 When the movable platen 5 is moved back, the molten metal 18 in the cavity 11 is solidified and cooled. , movable gold [
7 retreats and the mold is opened, and the cast product in the cavity 11 is attached to the movable nest 10 side and the mold is opened. protrudes into the cavity 11, and the cast product is extruded from the cavity 11. In such an injection operation, the machine vibrates before and during injection of the wire and molten metal 19, causing the mold 6 to
．． If the T is vibrated or the molten metal 19 is injected and flows inside the cavity 11, the insert 25 may move on the core bottle 24 or come off the core bottle 24 and fall off. In this device, the insert 25 is attracted to the core bin 24 and firmly fixed thereto, so the insert 25 does not move or fall off. By forming the core bin 24 with the core 24m made of a magnetic material and the bobbin 24b made of a non-magnetic material, the magnetic flux from the electromagnetic coil 27 is efficiently transmitted to the core bin 24 and the inserter) 25, resulting in low consumption. The insert 25 can be reliably attracted by the electric power. In the example, it is possible to reliably attract the material with a current of 24 V and 12 W.

FIG. 4 is an enlarged sectional view of a core bin showing another embodiment of the present invention corresponding to FIG. 2, and in this embodiment, the insert 25 which was ring-shaped in the previous embodiment is The insert 30 is formed in a semicircular arc shape as shown by the reference numeral 30, and is attached to the tip arc surface formed on the bobbin 31 of the core bin 31. and is attracted by the movable nest 10. Other electromagnetic coils 2T
The cooling device and the like are the same as in the previous embodiment. With this structure, the insert 30 is firmly fixed to the core bin 30 and the movable nest 10, and will not fall off or become loose when moved. Note that this type of insert 30 is applied when insert-molding a half-shaped bearing and a bearing metal.

Although this embodiment shows an example in which the present invention is applied to a horizontal clamping mold for a die-casting machine, it can also be applied to a vertical clamping mold. The same can be applied to molds.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, in the case of a molding metal, the core bin, on which the insert is attached at the tip facing into the mold cavity, is attached to the core bin, which is attached to the tip end facing into the mold cavity. It is made of a magnetic material and a non-magnetic material surrounding it, and an electromagnetic coil is fitted around the outer periphery of the non-magnetic material.When an insert is fitted into this core bin and the electromagnetic coil is energized, The magnetic material of the core bottle and the insert are magnetized and the insert is attracted and fixed to the core bottle extremely firmly, so even if the injected melt flows in the cavity when the machine is vibrated, the insert will remain intact. There is no possibility of moving or falling off, greatly reducing the incidence of defective molded products, and promoting automation and rationalization. This effect is particularly great when the insert is installed facing downward. In addition, since the core bin is made of magnetic and non-magnetic materials, the magnetic flux of the electromagnetic coil is efficiently transmitted to the core bin and the insert, and the insert is reliably attracted to the core bin with low power consumption. be able to.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the molding metal insert fixing device according to the present invention, FIG. 1 is a sectional view of a die of a die casting machine in which this device is implemented, and FIG. 2 is a core bin. Figure 3 is an enlarged cross-sectional view of a die casting machine embodying the present invention, and Figure 4 is an enlarged view of a core piece y showing another embodiment of the present invention corresponding to Figure 2. FIG. 6...@Kengou mold, T...-movable mold, 9...
Fixed nest, 10... Movable nest, 11... Cavity, 24, 31... Core bin, 24 & 131
b* @ a e core, 24b, 31a*...bobbin, 25.30-...-insert, 2B-...Φ bypass bin, 2T...-electromagnetic coil.

Claims (1)

[Claims] The core pin, on which the insert is mounted at the tip facing into the mold cavity, is formed of a magnetic material in the center part of which is in contact with the insert, and a non-magnetic material around it, and the outer periphery of the non-magnetic material. An insert fixing device for a molding die, characterized in that an electromagnetic coil is fitted into the mold.