JPH0773783B2 - Insert fixing device for casting mold - Google Patents

Description

The present invention relates to a die casting machine, a plastic injection molding machine, or the like, in which an insert that is inserted into a molding die and simultaneously molded moves or fits during injection molding. The present invention relates to an insert fixing device for fixing to a casting mold so as not to fall off from the joint.

[Conventional technology]

Injection molding by a die casting machine or a plastic injection molding machine, etc. is to inject a molten metal or a molten resin into the cavity of a mold and obtain an injection molded product by solidifying it, but in this type of injection molding, For example, inserts for bearings formed in the shape of a ring or semi-circle are often fitted to the mold protrusions and core pins facing the mold cavity, and are often molded simultaneously with the injection molded product. Be done.

[Problems to be solved by the invention]

However, in injection molding in which such inserts are inserted and simultaneously molded, the inserts may move due to vibration of the machine during mold clamping or the flow of the melt injected into the cavity during molding, and especially the insert fitting. When the part was facing down, the insert could fall into the cavity, resulting in defective molded products, which was also an obstacle to automation and rationalization.

[Means for solving problems]

In order to solve such a problem, in the present invention, a core pin in which an insert is attached to a tip end facing the inside of the mold cavity, a central part which is in direct contact with the insert or through a magnetic connecting member The magnetic material and the non-magnetic material around it were formed, and the electromagnetic coil was fitted on the outer peripheral portion of the non-magnetic material.

[Work]

When the insert is attached to the core pin, the electromagnetic coil is energized, and then the mold is clamped for molding, the magnetic material and the insert are magnetized and stick to each other, and the insert is firmly fixed to the core pin. At the same time, the magnetic flux is the magnetic material of the core pin,
It is efficiently transmitted between the insert and the mold to form a closed magnetic field.

〔Example〕

1 to 3 show an example in which the insert fixing device for a casting die according to the present invention is applied to a horizontal die-casting die-casting machine, and FIG. 1 shows a die of a die-casting machine that implements this. A sectional view, FIG. 2 is an enlarged sectional view of a core pin, and FIG. 3 is a partially cutaway schematic side view of a die casting machine embodying the present invention. In the figure, a die casting machine 1 is provided with a stationary platen 4 standing upright on a machine base 2 and connected at four corners by tie bars 3 and a stationary platen (not shown). A movable platen 5 that moves forward and backward with respect to the fixed platen 4 is supported by a mold clamping cylinder on the side of the platen. A fixed die 6 is attached to the fixed platen 4, and a movable die 7 is attached to the movable platen 5 via a die base 8. A fixed insert 9 and a movable insert 10 are fitted in the concave holes of the fixed mold 6 and the movable mold 7, respectively, and the recesses are formed in the respective inserts 9, 10.
A core 9a and a core 10a are respectively formed, and a cavity 11 is formed between the recess 9a and the core 10a in the mold clamping state shown in FIG. Reference numeral 12 denotes a fixed sleeve fitted in the sleeve hole of the fixed insert 9 and having a tapered inner hole, in which a tapered cylindrical member 13 fitted in the movable insert 10 is engaged during mold clamping. The sprue 14 is formed by this engagement. 15 and 16 are gates 1
It is a runner and a gate formed between 4 and the cab 11. Further, in the sleeve holes of the fixed platen 4 and the fixed mold 6, a cylindrical injection sleeve 17 having a pouring port 17a is provided.
Is fitted on the same axis as the fixed sleeve 12, and the plunger cylinder 18 of the injection cylinder (not shown) is fitted in the inner hole thereof.
Is fitted so that it can move back and forth. By doing so, when the molten metal 19 is supplied from the pouring port 17a and the plunge tip 18 is advanced, the molten metal 19 is injected from the injection sleeve 17 into the cavity 11 via the spout 14, the runner 15, and the gate 16 and solidifies. As a result, a cast product as an injection molded product is obtained. On the other hand, a support pin 21 that is integrated with a support plate 20 that is advanced and retracted by an unillustrated extrusion cylinder is engaged in a pin hole provided in the movable platen 5, and a plurality of extrusion pins 22 are provided at the tip end portion thereof.
The extruded plate 23 having is fixed. And extrusion pin
22 is a cavity that penetrates the movable mold 7 and the movable nest 10.
11, the movable platen 5 is retracted and the mold is opened as shown in FIG.
The cast product in the cavity 11 is extruded by advancing the.

In the die casting machine 1 configured as described above, an insert that is simultaneously molded with a molded product is inserted in the cavity 11. That is, the pin hole formed in the movable insert 10 is fitted with a core pin indicated by reference numeral 24 as a whole, and the core pin 24 has a collar made of magnetic hot work tool steel as a magnetic material. A central core 24a formed in a cylindrical shape
And a bobbin 24b which is formed of a non-magnetic hot work tool steel as a non-magnetic material into a flanged cylindrical shape and is fitted around the outer periphery of the core 24a. Such a core pin 24
The insertion end portion of is exposed to the inside of the cavity 11 at the time of mold clamping, and in the case of the present embodiment, the ring-shaped insert 25 is fitted to this tip portion at the time of molding. 26 is the core
A plurality of electrical connection pins formed of a magnetic material that radially penetrates the bobbin 24b from the tip portion of 24a, the magnetic connection pin 26 constitutes the magnetic connection member according to the present invention, The insert 25 and the core 24a are in contact with each other and magnetically connected to each other. Then, in the annular groove 24c provided on the outer peripheral portion of the bobbin 24, an electromagnetic coil 27 connected to a power source (not shown) by a lead wire is mounted, and a magnetic flux is formed by energizing this, and a magnetic flux is generated. Is configured to be transmitted between the core 24a magnetic connection pin 26-core 10a-core 24a flange to form a closed magnetic field, and the insert 25 is attracted to the core 10a and magnetic connection pin 26. ing. 28 is
A cooler for cooling the electromagnetic coil water, which has a tip screw portion screwed into the opening of the water cooling hole 24d provided in the core 24a and is inserted into the hole of the movable mold 7, and 29 is an air communicating with the electromagnetic coil 27. This is a pose that is attached to the opening of the passage 10b and is connected to an air source (not shown) to send air for cooling and for preventing water from entering the electromagnetic coil 27 into the electromagnetic coil 27.

The injection operation of the die casting machine configured as above will be described. When the movable platen 5 is retracted and the insert 25 is fitted to the tip of the bobbin 24a of the core pin 24 and the electromagnetic coil 27 is energized, the core 24a as the magnetic material, the magnetic connection pin 26, and the insert are inserted. A magnetic flux is formed between the movable insert 25 and the movable insert 10 to magnetize the insert 25.
Is adsorbed to the core 10a and the core 24a and is firmly fixed.
Then, when the movable platen 5 is moved forward, the mold is clamped and the core 10a is engaged with the recess 9a to form the cavity 11. Therefore, the molten metal 19 is supplied from the pouring port 17a of the injection sleeve 17 to supply the plunge tip. When 18 is moved forward, the molten metal 19 is injected into the cavity 11 through the sprue 14, the runner 15 and the gate 16. When the movable platen 5 is retracted after waiting for the molten metal 19 in the cavity 11 to solidify and cool, the movable mold 7
Is retreated to open the mold, and the cast product in the cavity 11 is attached to the movable insert 10 side and opened. Then, when the push-out plate 20 is moved forward by the push-out cylinder, the push-out pin 22 projects into the cavity 11 and the cast product is pushed out from the cavity 11.

In such an injection operation, when the machine vibrates and the molds 6 and 7 vibrate before or during the injection of the molten metal 19, or when the molten metal 19 is injected and flows in the cavity 11,
Insert 25 moves over core pin 24 or
Although it tries to fall out of the insert pin and fall out, the insert 25 does not move or fall off because the insert 25 is adsorbed by the core pin 24 and firmly fixed to this in this device. Further, since the core pin 24 is formed by the core 24a made of a magnetic material and the bobbin 24b made of a non-magnetic material, the magnetic flux by the electromagnetic coil 27 is efficiently transmitted to the core pin 24 and the insert 25, and low power consumption. With this, the insert 25 can be reliably adsorbed. In the embodiment, it is possible to surely attract with a current of 24V and 12W.

FIG. 4 is an enlarged cross-sectional view of a core pin showing an embodiment of another invention of the present application corresponding to FIG. 2, and in this embodiment, the insert 25 which is ring-shaped in the embodiment,
As shown by reference numeral 30 in the drawing, it is formed in a semi-circular shape, and this insert 30 is attached to the tip circular arc surface formed on the bobbin 31a of the core pin 31, and is inserted into the core 31b and the movable nest 10.
Is adsorbed in. In addition, the electromagnetic coil 27 and its cooling device are the same as those in the above embodiment. With such a configuration, the insert 30 is firmly fixed to the core pin 30 and the movable nest 10, and does not move or fall off. The insert 30 of this type is applied when insert-molding a half bearing and a bearing metal.

In addition, although the present embodiment shows an example in which the present invention is applied to the horizontal mold clamping die of the die casting machine, the present invention can be similarly applied to the vertical mold clamping die, and the mold of the plastic injection molding machine. Can be similarly implemented.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, in the casting mold, the core pin to which the insert is mounted is attached to the tip end facing the inside of the mold cavity. It is formed of a magnetic material in the central part that contacts through the non-magnetic material around it, and an electromagnetic coil is fitted to the outer peripheral part of the non-magnetic material. When the coil is energized, the magnetic material of the core pin and the insert are magnetized, and the insert is adsorbed and firmly fixed to the core pin, so the machine vibrates and the injection melt flows in the cavity. However, the insert does not move or fall off, the incidence of defective molded products is greatly reduced, and automation and rationalization are promoted. Especially, the effect is great when the insert is mounted downward. Further, since the core pin is made of a magnetic material and a non-magnetic material, the magnetic flux of the electromagnetic coil is efficiently transmitted to the core pin and the insert, and the insert can be reliably attracted with low power consumption.

[Brief description of drawings]

1 to 3 show an embodiment of an insert fixing device for a casting mold according to the present invention. FIG. 1 is a cross-sectional view of a mold of a die casting machine which carries out this, and FIG. 2 is a core pin. 3 is an enlarged cross-sectional view of a die-casting machine embodying the present invention, and FIG. 4 is an enlarged cross-sectional view of a core pin showing another embodiment of the invention in correspondence with FIG. Is. 6 ... Fixed mold, 7 ... Movable mold, 9 ... Fixed nest,
10 …… Movable nest, 11 …… Calibration, 21,31 …… Core pins, 24a, 31b …… Core, 24b, 31a …… Bobbins, 25,30…
… Insert, 26 …… Bypass pin, 27 …… Electromagnetic coil.

Claims (2)

[Claims] 1. A core pin, in which an insert is mounted at a tip end facing the inside of a mold cavity, is formed of a magnetic material at a central portion, a part of which is in contact with the insert, and a non-magnetic material around the core. An insert fixing device for a casting mold, characterized in that an electromagnetic coil is fitted around the outer periphery of a magnetic material. 2. A core pin in which an insert is mounted at a tip end facing the inside of a mold cavity, wherein a magnetic material at the center and a non-magnetic material around the core are partially inserted into the insert through a magnetic connection member. An insert fixing device for a casting mold, characterized in that an electromagnetic coil is fitted to the outer peripheral portion of a non-magnetic material.