KR20160047805A - Combination structure of magnet and mold - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a coupling structure of an insert injection mold and a magnet, and more particularly to a coupling structure of an insert injection mold and a magnet, which can facilitate insert injection by assembling an injection molded magnet into a mold.
According to another aspect of the present invention, there is provided a mold for injecting inserts and a magnet, comprising: a mold including a lower mold and an upper mold which are coupled to each other to form an empty space in which an injection product is formed; A plurality of fixing protrusions protruding upward from the lower mold; And a plurality of fixing grooves formed in the inner space of the metal mold, the fixing protrusions being inserted into the mold, wherein the magnets are formed by injection molding, and a burr formed by injection is formed on either the upper surface or the lower surface And a plurality of the fixing protrusions and the fixing grooves are formed asymmetrically with respect to the center of the magnet, respectively.

Description

COMBINATION STRUCTURE OF MAGNET AND MOLD "

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a coupling structure of an insert injection mold and a magnet, and more particularly to a coupling structure of an insert injection mold and a magnet, which can facilitate insert injection by assembling an injection molded magnet into a mold.

FIG. 1 is a perspective view of a conventional mold for manufacturing an injection magnet and a magnet, and FIG. 2 is a process diagram illustrating a process of inserting a conventional injection magnet into a mold.

When the magnet is formed by injection molding, as shown in Fig. 1, the magnet injection mold 1 generally has a gate portion 2 through which a liquid material flows.

A burr 4 is formed on one side of the magnet 3 by the gate portion 2 when a liquid material flows into the gate portion 2 and the magnet 3 is injected.

2 (a), when the magnet 3 having the burrs 4 is mounted on the insert mold 5 and then the plastic is to be injected onto the outer surface of the magnet, the burr 4 There is no problem if the formed surface faces upward.

However, as shown in Fig. 2 (b), when the face on which the burrs 4 are formed faces downward and is brought into contact with the insert mold 5, the magnet 3 is inclined, It was difficult to inject inserts.

In addition, when a precise molded article to which the magnet 3 is inserted is required to be manufactured, the strength of the magnetic force is changed by the inclined magnet 3, which makes it difficult to mold a precise product.

In order to prevent this, the operator must always locate the burr 4 on the magnet 3 and properly position the magnet 3 on the insert mold 5 as shown in Fig. 2 (a). In this case, It takes a lot of time. Especially when the burr 4 is small, it is difficult to find the burr 4 itself.

Disclosure of Invention Technical Problem [8] The present invention provides a coupling structure of an insert injection mold and a magnet, which can prevent injection of an insert by disposing the magnet in an inclined manner by correctly mounting the injection-molded magnet on a plastic injection mold It has its purpose.

In order to achieve the above object, the present invention provides a mold for injecting inserts and a magnet, comprising: a mold comprising a lower mold and an upper mold which are coupled to each other to form an empty space in which an injection product is formed; A plurality of fixing protrusions protruding upward from the lower mold; And a plurality of fixing grooves formed in the inner space of the metal mold, the fixing protrusions being inserted into the mold, wherein the magnets are formed by injection molding, and a burr formed by injection is formed on either the upper surface or the lower surface And a plurality of the fixing protrusions and the fixing grooves are formed asymmetrically with respect to the center of the magnet, respectively.

By combining the asymmetrically formed fixing protrusions with the fixing grooves, the magnets mounted on the lower mold are coupled so that the burrs are disposed only in the upward direction.

The fixing protrusion includes a first fixing protrusion and a second fixing protrusion spaced apart from each other. The fixing groove has a first fixing groove into which the first fixing protrusion is inserted and a second fixing groove into which the second fixing protrusion is inserted Wherein one of the first fixing groove and the second fixing groove is located at a lower portion and the other at an upper portion with respect to a horizontal center line of the magnet when the magnet is viewed from above.

The size of the first fixing groove is larger than the size of the second fixing groove.

Sectional area of the first fixing projection is larger than a sectional area of the second fixing projection.

The first fixing protrusion is formed in a shape corresponding to the first fixing groove, and the second fixing protrusion is formed in a shape corresponding to the second fixing groove.

The magnet is formed in a cylindrical shape, and the first fixing groove and the second fixing groove are formed concavely centered on the outer circumferential surface of the magnet.

As described above, according to the coupling structure of the insert injection mold and the magnet of the present invention, the following effects can be obtained.

When the plastic projections are inserted and injected into the outer surface of the magnet by the asymmetrically arranged fixing projections and the fixing grooves, it is possible to prevent the magnets arranged inside from being twisted and inserted by the burr formed on one surface.

As a result, it is possible to more easily manufacture the plastic precision injection molded body in which the magnet is inserted in the correct position, and the operator can insert the fixing protrusion into the fixing groove without confirming where the one surface of the buried magnet is, Can be improved.

Further, since the bur is present inside the insert insert, the bur can be prevented from being exposed to the outside.

FIG. 1 is a perspective view of a conventional mold for manufacturing an injection magnet, a magnet,
FIG. 2 is a process diagram showing a process of inserting a conventional injection magnet into a mold,
3 is an exploded perspective view for explaining a coupling structure of the insert injection mold and the magnet according to the embodiment of the present invention,
4 is a perspective view and a plan view of a magnet according to an embodiment of the present invention,
5 is a view illustrating a process of fitting a magnet to a mold according to an embodiment of the present invention.
6 is a plan view of a state where a magnet is arranged on an upper portion of a fixing protrusion according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view illustrating a coupling structure of a mold for injecting insert and a magnet according to an embodiment of the present invention, and FIG. 4 is a perspective view and a plan view of a magnet according to an embodiment of the present invention.

3 to 4, the coupling structure of the insert injection mold and the magnet according to the present invention includes a mold 10, a fixing protrusion 20, and a magnet 30.

The mold 10 forms an empty space in which the lower mold 11 and the upper mold 12 are coupled to each other and a plastic injection molding is formed therein.

The fixing protrusions 20 are formed in a plurality of protrusions upwardly from the lower mold 11.

The magnet 30 is disposed in an inner space of the mold 10 and has a plurality of fixing grooves 31 into which the fixing protrusions 20 are inserted.

At this time, the magnet 30 is formed by injection molding, and a burr 34 according to the injection molding is formed on the upper surface or the lower surface of the magnet 30 as described in the background art.

The plurality of fixing protrusions 20 and the fixing grooves 31 are formed asymmetrically with respect to the center of the magnet 30, respectively.

The fixing protrusion 20 and the fixing groove 31 formed asymmetrically as described above allow the magnet 30 mounted on the lower mold 11 to be fixed to the upper surface of the lower mold 11, So that they can be combined.

More specifically, the fixing protrusions 20 include first fixing protrusions 21 and second fixing protrusions 22 spaced from each other.

The fixing groove 31 includes a first fixing groove 32 into which the first fixing protrusion 21 is inserted and a second fixing groove 33 into which the second fixing protrusion 22 is inserted.

4, when the magnet 30 is viewed from the top, any one of the first and second fixing grooves 32 and 33 is formed on the basis of the horizontal center line of the magnet 30, And the other one is located at the top.

In the present embodiment, the first fixing groove 32 is positioned below the horizontal center line of the magnet 30, and the second fixing groove 33 is located at the top.

The first fixing groove 32 and the second fixing groove 33 are formed to be in contact with the boundary line of the N pole and the S pole of the magnet 30 so that the fixing groove 31 is formed in the magnet 30, So as not to affect the magnetic field.

The size of the first fixing groove 32 is larger than that of the second fixing groove 33.

The first fixing protrusions 21 inserted into the first fixing groove 32 and the second fixing protrusions 22 inserted into the second fixing groove 33 may have the same size, Sectional area of the first fixing protrusion 21 is greater than a sectional area of the second fixing protrusion 22 in order to prevent the magnet 30 coupled to the fixing protrusion 20 from flowing.

The first fixing protrusion 21 is formed in a shape corresponding to the first fixing groove 32 and the second fixing protrusion 22 is formed in a shape corresponding to the second fixing groove 33 .

In this embodiment, the magnet 30 is formed in a cylindrical shape, and the first and second fixing grooves 32 and 33 are recessed from the outer circumferential surface of the magnet 30.

Therefore, the first fixing groove 32 and the second fixing groove 33 can be easily formed.

Hereinafter, a coupling process of the magnet 30 according to the present invention having the above-described configuration will be described.

 FIG. 5 is a view illustrating a process of attaching the magnet 30 to the mold 10 according to the embodiment of the present invention. FIG. 6 is a view showing a process of attaching the magnet 30 to the upper portion of the fixing protrusion 20 according to the embodiment of the present invention. (30).

The magnet 30 is disposed on the fixing protrusion 20 as shown in FIG. 5 (a).

At this time, the first fixing protrusions 21 and the second fixing protrusions 22, the first fixing grooves 32 and the second fixing grooves 33 are different in size, and the center of the magnet 30 is set as a reference When the magnet 30 having the burr 34 formed thereon is arranged in the upward direction as shown in Figs. 5 (b) and 6 (a), the magnet 30 It can be easily coupled to the fixing protrusion 20.

6 (b), when the one side of the magnet 30 on which the burr 34 is formed is arranged downward, the positions of the fixing projections 20 and the fixing grooves 31 are different from each other , The magnet (30) can not be coupled to the fixing protrusion (20).

Therefore, the operator can easily assemble the magnet 30 to the fixing protrusion 20 so that the surface on which the burr 34 is formed faces upward.

In this way, when the plastic injection molding is inserted and injected into the outer surface of the magnet 30, it is possible to prevent the magnet 30 disposed inside from being distorted and inserted by the burr 34.

Further, since the burr 34 is present inside the insert injection molding, the burr 34 can be prevented from being exposed to the outside.

The coupling structure of the insert injection mold and the magnet according to the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the technical idea of the present invention.

10: mold, 11: lower mold, 12: upper mold,
20: fixing protrusion, 21: first fixing protrusion, 22: second fixing protrusion,
(30), a magnet (31), a fixing groove (32), a first fixing groove (33), a second fixing groove (34)

Claims (7)

A mold comprising a lower mold and an upper mold which are coupled to each other to form an empty space in which an injection product is formed;
A plurality of fixing protrusions protruding upward from the lower mold;
And a plurality of fixing grooves formed in the inner space of the metal mold and into which the fixing protrusions are inserted,
Wherein the magnet is formed by injection molding and a burr formed by injection is formed on either the upper surface or the lower surface,
Wherein the plurality of fixing protrusions and the fixing grooves are formed asymmetrically with respect to the center of the magnet, respectively. The method according to claim 1,
Wherein the magnet mounted on the lower mold is coupled with the burr so that the burr is disposed only in the upward direction by the coupling of the asymmetrically formed fixing protrusion and the fixing groove. The method of claim 2,
Wherein the fixing protrusions comprise a first fixing protrusion and a second fixing protrusion spaced from each other,
Wherein the fixing groove comprises a first fixing groove into which the first fixing protrusion is inserted and a second fixing groove into which the second fixing protrusion is inserted,
When the magnet is viewed from above,
Wherein one of the first fixing groove and the second fixing groove is located at the lower portion and the other at the upper portion with respect to the horizontal center line of the magnet. The method of claim 3,
Wherein a size of the first fixing groove is larger than a size of the second fixing groove. The method of claim 4,
Wherein a sectional area of the first fixing protrusion is larger than a sectional area of the second fixing protrusion. The method of claim 5,
Wherein the first fixing protrusion is formed in a shape corresponding to the first fixing groove,
And the second fixing protrusion is formed in a shape corresponding to the second fixing groove. The method according to any one of claims 3 to 6,
The magnet is formed in a cylindrical shape,
Wherein the first fixing groove and the second fixing groove are concavely formed in the center of the outer circumferential surface of the magnet.

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