KR20160077734A - Insert mold capable of non-contact high frequency induction heating to insert material - Google Patents

Abstract

The present invention relates to an insert mold capable of non-contact high-frequency induction heating of an insert member. More particularly, the present invention relates to an insert mold capable of non-contact high-frequency induction heating of an insert member, which can preheat a metallic insert material for increasing binding ability of the insert member with a molded product in an insert mold carrying out molding while the insert member is inserted into the cavity of the mold, wherein the insert member is heated by using non-contact induction heating technology so that the insert member may be heated to a predetermined temperature within a short time, and can heat the insert member while being conveyed by transfer. The insert mold capable of non-contact high-frequency induction heating of an insert member according to the present invention carries out molding while the insert member is inserted into the cavity of the mold, wherein the insert member comprises a metallic material. In the insert mold, the insert member comprises a transfer for taking the insert member outside and conveying the insert member into the cavity of the mold; a preheating unit for heating the insert member taken by the transfer so that the insert member may be inserted into the cavity of the mold while being heated to a predetermined temperature, wherein the preheating unit comprises an induction coil which is disposed in the vicinity of the insert member taken by the transfer in a non-contact state so that the insert member may be heated by the eddy current heat loss or hysteresis heat loss, and high-frequency current flows through the induction coil.

Description

[0001] INSERT MOLD CAPABLE OF NON-CONTACT HIGH FREQUENCY INDUCTION HEATING TO INSERT MATERIAL [0002]

More particularly, the present invention relates to an insert-molding die capable of induction-free high frequency induction heating of an insert member, and more particularly, to an insert-molding die in which an insert member is inserted into a cavity of a mold, It is possible to heat the insert member to a predetermined temperature in a short time by heating the insert member by using a non-contact high frequency induction heating technique, and furthermore, it is possible to heat the insert member in the transferring process by the transfer of the insert member The present invention relates to an insert-molding die capable of induction-free high-frequency induction heating of an insert member.

BACKGROUND ART [0002] In recent years, an insert molding for applying a plastic film to the surface of an insert member made of a metal material has been added to components constituting a vehicle and each mechanical device, so that it has a corrosion resistance and a noise prevention function.

Generally, the insert molding in which the plastic film is applied to the surface of the insert member is performed by inserting the insert members individually into the molding portions of the insert molds directly, and then supplying the plastic polymer material through the melt injection portions to form a plastic film on the surface of the insert And then the operator discharges it and visually inspects it.

However, when the insert molding is performed manually as described above, a labor cost is added according to the input of the operator, and the productivity is significantly lowered. Therefore, the spread of the automatic apparatus capable of automatically processing the insert molding Urgent.

Conventionally, in the insert molding process, an insert member made of a metal material is inserted into a molding part of a mold without pretreatment, and plastic polymer is supplied through a melt injection part.

Therefore, the supplied plastic polymer is cooled by the temperature difference with the insert member, so that the fluidity is significantly lowered, and the molten resin in the portion in contact with the insert member is quenched, resulting in poor bonding properties.

If the flowability of the plastic polymer is deteriorated as described above, not only the shape of the finished insert molding becomes poor, but also the surface is not smooth, which is a main cause of defects.

In order to solve the above-mentioned problems, in the prior art publication No. 10-2009-0117107 (published on November 11, 2009), there is disclosed an "insert molding apparatus" configured to preheat an insert made of a metal material and supply the insert to the insert mold , And JP-A-10-2010-00454665 (published on Apr. 30, 2010) discloses an automatic insert supplying device for inserting inserts equipped with a heating device for heating an insert.

The insert molding apparatus disclosed in Japanese Patent Application Laid-Open No. 10-2009-0117107 includes a loading section which is a stacking space of an insert; A preheating unit which is provided with one or more preheating grooves having an open upper portion and a plurality of inserts stacked on the stacking unit through the preheating grooves to preheat each of the inserts; A lower mold having one or more molding grooves which are an opening space of an insert preheated by the preheating section and a molding groove in which an insert is placed through a lowering structure installed on an upper portion of the lower mold, An insert mold comprising a top mold for supplying a polymeric material to form a plastic film on the surface of the insert; The inserts stacked on the stacking part are placed in the preheating groove of the preheating part through the transfer clamp and are preheated and then accommodated in the molding grooves of the insert mold so that the plastic polymer supplied through the melt injection part has a temperature deviation from the insert So that the plastic film is formed on the surface of the insert.

However, in the above-described prior art, there is a problem that it takes a long time to preheat the insert member in a conventional heating method such as a heater in a preheating portion and in a case where the insert member is preheated in the preheating portion, There is a problem in that the efficiency of the insert member is reduced due to the cooling of the preheated insert member during the transfer process.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to preheat an insert member of a metal material in order to improve the coupling property of the insert member, It is an object of the present invention to provide an insert molding die which can be heated at a high temperature and can be heated in the process of transferring by the transfer of the insert member.

In order to achieve the above object, an insert-forming mold capable of induction-free high-frequency induction heating of an insert member according to the present invention is characterized in that the insert member is formed in a state where an insert member is inserted into a cavity of a mold, A transfer unit which is made of a metal material and which grips the insert member from the outside to move the insert member into the cavity of the mold; A preheating means for heating the insert member gripped by the transfer so that the insert member is inserted into the cavity of the mold while the insert member is heated to a predetermined temperature; Wherein the preheating means includes an induction coil disposed adjacent to the insert member held by the transfer so that the insert member is heated by eddy current loss heat or hysteresis loss heat and in which a high frequency current flows, do.

In the insert-molding die capable of induction-free high frequency induction heating of the insert member according to the present invention, the induction coil is placed inside the transfer so that the insert member gripped by the transfer is heated in the cavity of the mold .

Further, the insert-forming mold capable of non-contact high-frequency induction heating of the insert member according to the present invention is characterized in that the mold is an injection-molding mold or a die-casting mold.

According to the above-described structure, the insert-molding mold capable of non-contact high-frequency induction heating of the insert member according to the present invention can heat the insert member to a predetermined temperature in a short time by heating the insert member using a non- Furthermore, by disposing the induction coil inside the transfer, it is possible to heat the transfer member by the transfer of the insert member.

1 to 6 are cross-sectional views illustrating a state of use of an insert-forming mold capable of non-contact high-frequency induction heating of an insert member according to an embodiment of the present invention

Hereinafter, an insert molding die capable of non-contact high frequency induction heating of the insert member according to the present invention will be described in detail with reference to the embodiments shown in the drawings.

1 to 6 are cross-sectional views illustrating the use of an insert-forming mold capable of non-contact high-frequency induction heating of an insert member according to an embodiment of the present invention.

1 to 6, an insert-forming mold capable of non-contact high-frequency induction heating of an insert member according to an embodiment of the present invention is characterized in that an insert member I made of a metal material is inserted into a cavity C of a metal mold 1 The insert molding die 1 in which the molding is carried out in the inserted state comprises the transfer 10 and the preheating means 20.

The mold 1 includes a lower mold 1a in which a cavity C is formed and a resin R which is formed in the lower mold 1a and melted into the cavity C And an upper mold 1b having a resin injection port 11b formed so as to be vertically penetrated so as to be injected into the upper mold 1b.

The mold 1 may be a die casting mold used for precision casting using a die similar to that of the injection molding die but similar to the injection molding die according to the embodiment of the present invention.

The transfer (10) is configured to grip the insert member (I) from the outside and to move into the cavity (C) of the mold (1).

The transfer unit 10 includes a horizontal movement arm 11 for horizontally moving the insert member I and a plurality of insert members I connected to the ends of the horizontal movement arms 11, And a clamp 13 connected to the distal end of the vertical movement arm 12 and gripping the insert member I. The vertical movement arm 12 is connected to the vertical movement arm 12,

The clamp 13 may be formed in the form of a clamp that physically grasps the insert member I. The insert member I may be formed of a metal material, Or may be constituted by an electromagnet capable of attaching the insert member I and a suction pad capable of attaching the insert member I using a suction force.

The preheating means 20 heats the insert member I gripped by the transfer 10 to be inserted into the cavity C of the mold 1 while the insert member I is heated to a predetermined temperature .

That is, when the molten resin (R) is extruded in a state of being inserted into the cavity (C) of the mold (1) without heating the insert member (I), the insert member (I) The molten resin R is rapidly cooled at a portion where the insert member I at room temperature and the resin R in a high temperature state are in contact with each other, The joint surface of the insert member I and the resin R does not completely come into contact with each other due to the thermal stress caused by thermal expansion from the resin R in the uncooled portion and shrinkage occurs. There is a problem that a phenomenon that the insert member I is severely separated from the resin R occurs.

The present invention minimizes the temperature difference between the molten resin R and the insert member I due to the structure of the preheating means 20 for heating the insert member I so as to minimize the thermal stress around the insert member I So that the molten resin R is uniformly cooled, thereby improving the bonding force between the insert member I and the molten resin R.

In an embodiment of the present invention, the preheating means 20 may be arranged to contact the insert member I gripped by the transfer 10 so that the insert member I is heated by the eddy-current loss heat or hysteresis loss heat And an induction coil 21 arranged close to and flowing a high-frequency current.

In the high-frequency induction heating, when the induction coil through which a high-frequency current flows approaches the object to be heated, the object to be heated is placed in an alternating magnetic field so that eddy current is generated. As a result, Hysteresis loss is generated to generate heat in the object to be heated, which is also referred to as IH (Induction Heating).

The high-frequency induction heating system has an advantage that rapid heating can be performed since energy can be applied to the insert member I to be heated for a short time.

The induction coil 21 is disposed inside the transfer 10 so that the insert member I gripped by the transfer 10 is inserted into the cavity C of the mold 1, The heat can be heated in the process of moving to the inside, thereby shortening the time for heating and minimizing heat loss.

Hereinafter, with reference to FIGS. 1 to 6, the use state of the insert molding die capable of non-contact high frequency induction heating of the insert member according to an embodiment of the present invention will be sequentially described.

First, as shown in FIG. 1, the clamp 13 of the transfer 10 grips the insert member I from the outside.

2, the horizontal moving arm 11 of the transfer 10 is operated to move horizontally, and the vertical moving arm 12 of the transfer 10 is operated as shown in FIG. 3 to move the insert member I Is inserted into the cavity (C) of the mold (1).

When the insert member I is inserted into the cavity C of the mold 1, the transfer 10 is moved to the outside of the mold 1 as shown in FIG. 4, The mold 1b is lowered and is engaged with the lower mold 1a.

When the molten resin R is injected through the resin injection port 11b in a state where the upper mold 1b and the lower mold 1a are formed, the inside of the cavity C is filled with the molten resin R And the insert injection molding is completed.

When the insert injection molding is completed, the upper mold 1b is released from the lower mold 1a and the injection molded product is taken out from the lower mold 1a, though not shown in the figure.

The insert forming mold capable of non-contact high frequency induction heating of the insert member described above and shown in the drawings is only one embodiment for carrying out the present invention and should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is defined only by the matters set forth in the following claims, and the embodiments improved and changed without departing from the gist of the present invention are obvious to those having ordinary skill in the art to which the present invention belongs It will be understood that the invention is not limited thereto.

1 mold
1a lower mold
1b upper mold
11b resin inlet
C cavity
R resin
I insert member
10 Transfer
11 horizontal moving arm
12 vertical moving arm
13 Clamp
20 Preheating means
21 induction coil

Claims (3)

1. An insert forming die in which molding is performed in a state where an insert member is inserted into a cavity of a mold,
Wherein the insert member is made of a metal material,
A transfer unit for gripping the insert member from the outside and moving the insert member into the cavity of the mold;
A preheating means for heating the insert member gripped by the transfer so that the insert member is inserted into the cavity of the mold while the insert member is heated to a predetermined temperature; Including,
Characterized in that the preheating means comprises an induction coil which is disposed in a noncontact state close to the insert member held by the transfer so that the insert member is heated by eddy current loss heat or hysteresis loss heat and in which a high frequency current flows, Insert molding mold capable of non-contact high frequency induction heating. The method according to claim 1,
Wherein the induction coil is disposed inside the transfer so that the insert member gripped by the transfer is heated during movement of the insert member into the cavity of the mold. 3. The method according to claim 1 or 2,
Wherein the mold is an injection molding die or a die casting die.

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