JPH07214281A - Insert device of magnetic material parts - Google Patents

Abstract

PURPOSE:To attract and hold magnetic material parts to the inside surface of a mold by relatively weak magnetic force in the case of insert casting or insert molding of the magnetic material parts. CONSTITUTION:The one mold 2 is provided with a part of a nonmagnetic material 4 and a holding member 5 consisting of a magnetic material is penetrated in this part. This holding member 5 is magnetized by an external magnet 6 to attract and hold the magnetic material parts 1 to the inside end face of the holding member 5. Casting or molding is then executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic component insert device used for producing a cast product or a molded product into which a magnetic component is inserted.

[0002]

2. Description of the Related Art As a metal casting or molded product into which a magnetic component is inserted, there is a cooking pot used in, for example, an induction heating range. This pot is made of aluminum because it is required to be lightweight and have good thermal conductivity, but since aluminum is a non-magnetic material, it cannot be induction-heated. For this reason, magnetic parts are inserted into the bottom of the aluminum pot.

When manufacturing an aluminum pan into which such magnetic parts are inserted, it is necessary to hold the magnetic parts on the inner surface of the manufacturing die in advance. As a method therefor, a method of adsorbing and holding the magnetic component on the inner surface of the mold by a magnet attached to the outside of the mold is conceivable, but there is a problem that the magnet is deteriorated or damaged early by the heat of the mold.

Further, since the entire mold is a magnetic body, the magnetic force of the magnet is hard to reach the magnetic body parts to be inserted, and it is difficult to attract and hold it. If the magnetic force of the magnet is increased, the mold or the entire machine is magnetized, and it is difficult to insert it in a certain place. In addition, the magnetic force has a problem of adversely affecting peripheral devices, and a magnet having a too large magnetic force cannot be used.

The problems described above also apply to insert molding of synthetic resin.

Therefore, according to the present invention, a magnet having a relatively weak magnetic force that does not magnetize the mold or the machine and does not adversely affect the periphery of the machine is used to securely attract and hold the magnetic component to the inner surface of the mold. It is an object of the present invention to provide an insert device that can be cast or molded while being made.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a magnetic material part comprising a manufacturing die for manufacturing a metal or synthetic resin product into which a magnetic material part is inserted, and a magnetizing device. In the insert device, all of the manufacturing die is composed of a non-magnetic material part, or a part of the manufacturing die is composed of a non-magnetic material over the entire length in the thickness direction, and the non-magnetic material part is made of a magnetic material. Through a pin-shaped holding member, the inner end surface of the holding member is exposed to the inner surface of the manufacturing die, and the magnetizing device is brought into contact with or close to the outer end portion of the holding member protruding from the manufacturing die. Then, the holding member is magnetized.

[0008]

When a certain product is manufactured by the above-mentioned insert device, the magnetic material parts are adsorbed and held on the inner surface of the manufacturing die in which the inner end surface of the holding member is exposed, and after closing the die, the molten metal is poured into the die. The holding member is magnetized by an external magnet. Since the portion where the holding member penetrates the mold portion is surrounded by the non-magnetic material, the magnetic lines of force of the magnet concentrate on the holding member. Therefore, even if the magnetic force of the magnet is not increased to the left, the magnetic component to be inserted can be securely attracted and held on the inner surface of the mold.

Since the heat of the manufacturing die is transferred to the magnet through the holding member, when the heat may adversely affect the magnet, when the molten metal begins to solidify, the magnet is moved from the outer end of the holding member. Keep only the required distance away from heat.

[0010]

EXAMPLE An example shown in FIGS. 1 and 2 is a magnetic part 1.
This is a case of manufacturing a product in which is inserted by casting or molding. The manufacturing mold is composed of two-sided molds 2 and 3. On one part of the bottom surface of the mold 2, a non-magnetic material 4 (for example, ambiloy SUS) having a thickness extending over the inner and outer surfaces
Are integrally embedded, and a plurality of pin-shaped holding members 5 made of a magnetic material penetrate the non-magnetic material 4. The inner end surface of the holding member 5 is exposed to be flush with the bottom surface of the cavity of the mold 2. Further, the outer end portion thereof projects outside the non-magnetic body 4.

A magnet 6 for magnetizing, which is a permanent magnet or an electromagnet, is provided facing the outer end surface of the holding member 5. The magnet 6 is supported by the air cylinder 7 or the like, and is separated from the outer end surface of the holding member 5 (FIG. 1) or comes into contact with the outer end surface (FIG. 2). In the figure, numeral 8 is a sprue.

When insert casting is performed using the above apparatus, the air cylinder 7 is driven to bring the magnet 6 into contact with the outer end surface of the holding member 5 with the other die 3 being opened as shown in FIG. The holding member 5 is magnetized. On top of that, mold 2
The magnetic body component 1 is attracted to the inner end surface of the holding member 5 inside.
In this case, the magnetic force lines of the magnet 6 are concentrated on the holding member 5 because the holding member 5 is a magnetic body and the surroundings are surrounded by the non-magnetic body 4, and the magnetic force is approximately the same as the magnetic force of the magnet 6. The component 1 is suction-held.

Since the inner end surface of the holding member 5 and the inner surface of the non-magnetic member 4 form a part of the mold, they are easily damaged as they are. Therefore, it is desirable to perform surface treatment to prevent this.

Thereafter, if necessary, a mold release material is applied to the inner surfaces of the molds 2 and 3, and then the mold 3 is closed. As shown in FIG. Inject 9. When the molten metal 9 begins to solidify, the air cylinder 7 is driven in the opposite direction to pull the magnet 6 away from the outer end surface of the holding member 5 so that the magnet 6 is not damaged by the heat of the molten metal 9. When the magnet 6 is not separated from the holding member 5, the magnet 6 is cooled by air-liquid cooling or the like. When the heat is low, no special cooling is needed. Thus, the magnetic component 1
An insert cast product having one surface exposed to the outer surface is obtained.

In the above embodiment, the cavity 10 of the molds 2 and 3 is expressed by a simple shape, but the cavity 10 is formed in a shape corresponding to the shape of the cast product. For example, if this is formed in the shape of a cooking pot, a product obtained by insert casting in a state in which one surface of the magnetic component 1 is exposed on the bottom surface of the aluminum pot can be obtained.

In the other embodiment shown in FIG. 3, the non-magnetic body 4 of the mold 2 is individually provided around each holding member 5. In this case as well, the magnetic component 1 can be insert-cast by the same action as in the above case.

Another embodiment shown in FIG. 4 is a case where one end of the magnetic body component 1 to be inserted is held by the divided surfaces of the molds 2 and 3. In this case, a portion of the non-magnetic body 4 is provided outside the cavity 10 of the mold 2, and the holding member 5 penetrates the portion of the non-magnetic body 4.

The magnetic component 1 is attracted and held by the inner end surface of the holding member 5. According to this device, the magnetic body component 1 can be inserted inside the product.

When a sand mold is used as the manufacturing mold, since the whole is a non-magnetic material, it is not necessary to partially provide the non-magnetic material 4 as described above, and the holding member 5 can be directly placed at an appropriate position. To penetrate. Magnetic parts 1 for synthetic resin products
Also in the case of insert molding, it is possible to perform insert molding by injection molding using a manufacturing die having the same structure as each of the above-mentioned embodiments.

[0020]

As described above, according to the present invention, in both insert casting and insert molding, the magnetic member to be inserted is sucked and held on the inner surface of the mold by the magnetized holding member. Since the member penetrates the non-magnetic material part which constitutes all or a part of the mold, the magnetic force lines are concentrated on the inner end surface of the holding member. Therefore, by simply magnetizing the holding member with a weak magnetic force that does not adversely affect the peripheral portion of the manufacturing apparatus, the magnetic component can be adsorbed and held on the inner surface of the mold to perform insert casting or insert molding.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold device according to an embodiment.

FIG. 2 is a sectional view of the same casting state as above.

FIG. 3 is a sectional view of another embodiment in a cast state.

FIG. 4 is a sectional view of another embodiment in a cast state.

[Explanation of symbols]

 1 magnetic material parts 2 fixed mold 3 movable mold 4 non-magnetic material 5 holding member 6 magnet 7 air cylinder 8 gate 9 molten metal 10 cavity

Claims (1)

[Claims] 1. An insert device for a magnetic part, comprising a manufacturing mold for manufacturing a metal or synthetic resin product into which a magnetic part is inserted, and a magnetizing device, wherein the manufacturing mold is entirely composed of a non-magnetic part. Or a part of its manufacturing die is made of a non-magnetic material over the entire length in the thickness direction, and a pin-shaped holding member made of a magnetic material is passed through the non-magnetic material portion, and the inner end surface of the holding member Is exposed on the inner surface of the manufacturing mold, and the holding device protruding from the manufacturing mold is brought into contact with or close to the magnetizing device to magnetize the holding member. Inserting device for body parts.