KR20090031167A - Mold apparatus for forming cooking vessel using for induction range and the cooking vessel - Google Patents

Abstract

A mold apparatus for forming a cooking vessel of an induction range type is provided to fix a heating plate on an exact location even if physical impact is applied by improving attaching power of the heating plate. A cooking vessel of an induction range type includes a main body of the vessel made of a non-magnetic material and a heating plate(22) of a magnetic material attached to a floor side. A mold apparatus(2) for forming a cooking vessel of an induction range type includes an upper mold(4) forming a cavity and a lower mold(6). A plurality of magnets(16) are installed on a bottom surface of an upper mold. The heating plate is attached and adhered by magnetic force of magnet.

Description

Mold apparatus for forming a cooking vessel for an induction stove and a cooking vessel thereby {mold apparatus for forming cooking vessel using for induction range and the cooking vessel}

The present invention relates to a cooking container for an induction stove, and more particularly to a molding die device for die casting of the cooking container for the induction stove, and a cooking container thereby.

Induction range refers to the induction range, when a current is applied to the coil installed under the top of the stove, a magnetic force line is generated in this coil, and the eddy current generated when the magnetic force line passes through the bottom of the cooking vessel placed on the top plate. It is a cooking heating means having the principle of heating only the bottom surface of the pot using eddy current). In order to use the induction stove, the bottom of the cooking vessel must include a magnetic material containing iron (Fe). Unlike the bottom surface, the main body of the container is inexpensive and aluminum, which is a nonmagnetic material widely used for cooking containers, is used. This induction stove is a cooking system that has been in the spotlight recently because the bottom of the cooking vessel is dropped from the top of the stove and the heating is stopped so that there is little concern for burns, the thermal efficiency is high, and there is no need for ventilation of the cooking space. .

The cooking vessel used for the induction stove is made of two kinds of materials with different properties: the container body is nonmagnetic and some layers of the bottom plate are magnetic. Efforts to firmly attach such different materials to each other continue in recent years. For example, the bottom plate is a magnetic plate (or heating plate, hereinafter, the same) in the form of a plate made of 24 kinds of stainless steel (SUS 430) having iron components.

First, there is a method of attaching by a high frequency heat fusion method, which has a problem that the bottom plate is easily separated when used for a long time due to different thermal strain by different materials.

Second, when the container body is made of aluminum, a die casting method was also used, including a problem in that the magnetic plate was firmly attached to the inside of the mold, and it was difficult to accurately maintain the flatness of the magnetic plate. In response to this problem, a method of firstly die-casting a magnetic plate and then injecting it into a mold again has been disclosed (see Korean Patent No. 10-0534490). However, this is a cumbersome problem of having to diecast twice.

In addition, according to Republic of Korea Patent No. 10-0402929 there is a problem that the magnetic plate is exposed to the upper surface of the bottom plate of the cooking vessel by the elastic protrusion. This will adversely affect the corrosion and food of the magnetic plate.

Meanwhile, according to Patent No. 10-0611646, which is recently registered by the Korean Intellectual Property Office, to overcome these problems, several metal foils are made of the same material as the material of the container body, and then installed in a mold to melt temperature. By dissolving and integrating the magnetic plate, the magnetic plate is disclosed to be supported and fixed in the mold by the metal foil. However, according to this there is a problem that the molten metal injection rate must be lowered in order to keep the metal foil in place, thereby reducing the working speed extremely, and there is a manufacturing problem that it is not suitable for mass production because manual work must be involved.

An object of the present invention for the above problems, a die device that can be firmly attached to a non-magnetic container body and a magnetic bottom plate (hereinafter referred to as 'heating plate') having two different materials by the die casting method. It aims to provide. A detailed object of the present invention is to allow the heating plate to be firmly fixed in position during the injection and solidification of the molten metal in the mold, to enable rapid injection and mass production of the molten metal, and to expand the effective area of the heating plate to improve thermal efficiency (or Heating value).

The object of the present invention is to cast or die cast a cooking vessel for an induction range comprising a non-magnetic container body and a heating plate of a magnetic body attached to the bottom surface thereof; It consists of an upper mold and a lower mold for forming a cavity when molding; Several magnets are installed on the bottom surface of the upper mold to attach the heating plate by magnetic force, and the magnet has a magnetic transformation temperature (ie, exceeding the operating temperature (400 to 500 ° C.) of the mold). A samarium cobalt (SmCo) or alnico (alnico) permanent magnet having a Curie point) is achieved by a mold apparatus for forming a cooking vessel for an induction stove.

In other words, the heating plate is attached to the inner surface of the mold by using the physical properties of the magnetic heating plate, the magnet is embedded in the die casting mold, so that the heating plate is attached to the inside of the mold when the molten metal is injected and solidified by the magnet. Is achieved by. Here, the magnet should be used having a magnetostriction temperature (ie Curie point) that exceeds at least the operating temperature of the mold (400 ~ 500 ℃), preferably the melting temperature of aluminum (about 660 ℃). .

According to another feature of the invention, the magnet is first ejected from the mold at the time of demolding of the mold, and the magnetic force applied to the heating plate is removed or attenuated before demolding.

According to the mold apparatus as described above, the induction stove cooking container including a non-magnetic container body and a heating plate of a magnetic material embedded in the bottom surface by die casting molding is provided.

According to another feature of the present invention, there is provided for casting or die-casting a cooking vessel for an induction range consisting of a non-magnetic container body and a heating plate of a magnetic body attached to the bottom surface thereof; It consists of an upper mold and a lower mold for forming a cavity when molding; Several magnets are installed on the bottom surface of the upper mold and a vacuum forming means for sucking air is further installed, so that the heating plate can be attached by magnetic force and negative pressure. Induction is characterized in that the magnet is a samarium cobalt (SmCo) or alnico series permanent magnet having a magnetic transformation temperature (ie, Curie point) exceeding the operating temperature (400 ~ 500 ℃) of the mold Molding apparatus for forming cooking vessel for stove

According to the feature of the present invention, it is possible to easily adhere the heating plate to the correct position inside the die casting mold. By increasing the number of magnets attached, it is possible to improve the adhesion to the mold inner surface of the heating plate can be firmly fixed inside the mold. According to this, the heating plate can be fixed in place even when a physical impact caused by the molten metal is applied, thus increasing the working speed and also enables the use of a pressure casting method. In addition, it can be utilized in the automated process by the robot is provided a mold apparatus for forming a cooking vessel for induction stove suitable for mass production and a cooking vessel thereby.

Hereinafter, with reference to the accompanying drawings in the detailed description of the present invention will be described in more detail. 1 is a cross-sectional view of a mold apparatus according to an embodiment of the present invention. 2 is a perspective view of the heating plate, Figure 3 is a plan view. 4 is a cross-sectional view of a heating plate taken in the direction A-A of FIG. 3. 5 is a cross-sectional view showing the operating state of the mold apparatus step by step. 1 and 5 are not exact cross-sectional views and are edited based on a center line for convenience of description. 1 and 5 are cross-sectional views taken along line B-B of FIG. 3 when the heating plate 22 is used as a reference.

Aluminum and its alloys have good castability, and are usually processed into die-cast castings, which are precise and have excellent surface. The die casting mold apparatus 2 is largely classified into an upper mold 2 and a lower mold 4. The upper mold 4 may be assembled into the cavity core 8 and the upper core 10, and the lower mold 6 may be assembled into the stripper 12 and the insert core 14. The name and specific shape of each component is not the gist of the present invention.

The gist of the present invention resides in a structure in which a magnet 16, especially a permanent magnet, is installed inside the upper mold 4.

To this end, several magnet installation holes 18 are provided in the vertical direction in the upper mold 4, in particular, the upper core. The magnet fixing bolt 20 may be screwed into the magnet mounting hole 18, and the magnet 16 is screwed to the tip of the magnet fixing bolt 20. The magnet 16 may be tab-shaped in the shape of a rod. This allows the magnet 16 to be easily removed and installed from the mold when necessary.

The magnet fixing bolt 20 and the magnet 16 may be coupled by a screw method, and various joining methods may be employed. The magnet 16 may be exposed to the inner bottom surface 4a of the upper mold or embedded in the upper mold 4 to a predetermined depth. As a result, the heating plate 22 may be attached to the upper mold bottom 4a by magnetic force.

The number of installation of the magnet 16 is 6 as shown (Fig. 3), but is not limited to this. The diameter of the magnet 16 may also be selected in various ranges.

According to the exemplary embodiment of the present invention, the magnet fixing bolt 20 is partially or entirely fixed to the elevating plate 24 to move up and down in accordance with the elevating plate 24. The magnet fixing bolt 20 can be actuated like an eject pin. Here, the magnet fixing bolt 20 will be fitted to the magnet installation hole 18 to enable free flow in the vertical direction in the upper mold (4).

As shown in FIG. 5, only the magnet fixing bolt 20 ′ installed for fixing the outside is ejected from the mold by the elevating plate 24.

According to the present invention, the magnet 16 should be used having a magnetic transformation temperature (ie, Curie point) that exceeds at least the operating temperature (400 ~ 500 ℃) of the mold. Furthermore, it is more preferable if Curie point exceeds the melting temperature (about 660 degreeC) of aluminum. To this end, selection of the material of the magnet is a key aspect of the present invention. According to the present invention, a samarium cobalt (SmCo) -based magnet or an alnico magnet is recommended. Alico magnets are alloys of aluminum (Al) -nickel (Ni) -cobalt (Co) -iron (Fe), which have excellent characteristics with respect to temperature, and are frequently used when precision is required. Samarium cobalt magnets are a mixture of samarium and cobalt in a predetermined ratio and are also excellent in temperature characteristics.

In the center of the upper mold 4, a normal hot water inlet 26 (melt inlet) is provided. The manufacturing process by the mold apparatus as described above will be described with reference to FIG.

In the state where the upper and lower molds 4 and 6 of FIG. 5A are released, the heating plate 22 is interposed therebetween and attached to the magnet 16 installed on the bottom surface 4a of the upper mold. After that, it is molded as shown in FIG. 5 (b), and the molten aluminum C is injected through the spout 26 as shown in FIG. 5 (c). The molten metal (C) is injected to the portion indicated by hatching, and after the predetermined time has elapsed, the magnet fixing bolt 20 'and the magnet 16 are lifted up and down the plate 24 as shown in FIG. 5 (d). Is ejected by This is for the upper mold 4 to be easily released from the lower mold 6 by removing or reducing the magnetic force from the heating plate 22. The reason for attenuating (or removing) the magnetic force in advance is that the cooking vessel (V) is in a state of high temperature which is not yet completed when demolding, thereby preventing the adhesive part of the heating plate 22 from being damaged by the impact during demolding. To do this.

Then, when the mold is demolded after solidification as shown in FIG. 5 (d), the heating plate 22 is embedded in the bottom surface V1 of the cooking vessel in such a manner that an insert is injected. Afterwards, the portion protruding from the bottom surface V1 is finished by polishing to have a flat surface. As a result, the container body V2 is made of non-magnetic aluminum, and the bottom surface V1 is completed with an induction stove cooking container in which the heating plate 22 of the magnetic body is integrally and firmly attached.

According to the present invention, since the heating plate 22 is firmly attached to the inside of the mold, the pouring method is not gravity casting, as shown in FIG. That is, the scope of the present invention is not limited by the casting method shown.

Hereinafter, the heating plate 22 used in the present invention will be described with reference to FIGS. 2 to 4. The heat generating plate 22 may be a thin metal plate made of magnetic material, and an iron plate or an aluminum plated steel sheet having excellent heat resistance, high temperature corrosion resistance, and the like. Preferably stainless may be used, SUS430, SUS410S, ASTM TP 409 and the like can be used. That is, ferritic stainless steel, which is ferromagnetic in stainless steel, is used.

Iron (Fe) is typical as a magnetic material, but cobalt, nickel or alloys thereof may optionally be used as a material of the heating plate. That is, the heat generating plate 22 may be any material as long as it is a magnetic material. However, it would be more desirable if the workability is good and the thermal strain is similar to the thermal strain of the cooking vessel body and has corrosion resistance and heat resistance.

The heating plate 22 has a thickness of 0.5 to 5 mm, and a plurality of arc-shaped first and second long holes 28 and 32 are perforated along the circumferential direction. The first and second holes 28 and 32 will fill the aluminum, thereby improving the bonding force with the bottom surface of the container. According to the cooking vessel made by the mold apparatus of the present invention, the first and second long holes 28 and 32 do not need to be provided with many more than the conventional one. That is, according to the present invention, it is possible to increase the area of the remaining heat generating plate 22 except for the first and second long holes 28 and 32, thereby providing a cooking container having a structure capable of further improving heat generation to thermal efficiency.

For reference, the six small circles S (refer to FIG. 3) indicated by dotted lines mean a portion where the magnet 16 is located when attached to the mold. The molten metal through-hole 30 is provided in the center of the heat generating plate 22.

The second long hole 32 is provided in the circumferential direction on the outer side of the first long hole 28 to position the magnet 16. The second long hole 32 may be penetrated as shown, but may be press punched to form a step with a slight depth with respect to the reference plane of the heating plate 22.

The second hole 32 is responsible for the function of accurately and easily fitting the center of the heating plate 22 in the mold together with the magnetic force (see Fig. 1). Therefore, the width of the second long hole 32 corresponds to the diameter of the magnet 16.

The specific form of the heating plate 22 has little to do with the core of the present invention. Those skilled in the art can variously change the shape of the heating plate 22 as necessary, all of which are within the scope of the present invention.

Hereinafter, a mold apparatus according to another embodiment of the present invention will be described with reference to FIGS. 6 to 7. 6 is a cross-sectional view of a mold apparatus according to another embodiment of the present invention. 7 is a cross-sectional view showing the operating state of the mold apparatus step by step. 8 is a plan view of the heat generating plate 22 'used in the present embodiment. 6 and 7 are not exact cross-sectional views, but are edited based on a center line for convenience of description. 6 and 7 are cross-sectional views taken along the line C-C of FIG. 8 when the heating plate 22 'is referred to.

According to this embodiment, a vacuum forming means for applying negative pressure with the magnet 16 to adsorb and fix the heating plate 22 'onto the upper mold upper surface is further provided. The vacuum forming means forms an air hole 50 penetrating the upper mold in the longitudinal direction, and the air tube or air hose 54 is connected to the nipple 52 fixedly installed on the upper mold so as to communicate with the air hole. Can be. The air hose 54 is provided with a normal vacuum generating motor (not shown).

As shown, the lower portion of the air hole 50 in contact with the heating plate 22 'is expanded in the form of a funnel to facilitate the adsorption, thereby widening the adsorption area. The diameter of the air hole 50 is sufficiently variable.

An operation state of the mold apparatus of the type in which the vacuum forming means and the magnet are used together will be described with reference to FIG. 7. FIG. 7 (a) shows a state in which the mold is molded and the heating plate 22 'is fixed to the bottom surface of the upper mold 4. As shown in FIG. The magnetic force by the magnet and the suction force by the negative pressure act on the upper surface of the heating plate at the same time, whereby the heating plate 22 'is firmly attached to the bottom surface of the upper mold 4. The portion of the magnetic force is indicated by the circular dotted line S of FIG. 8, and the portion of the magnetic force is indicated by another circular dotted line S ′ of FIG. 8. As such, the point S on which the magnetic force acts and the point S ′ on which the attraction force acts can be arranged in balance, respectively.

In this state, molten aluminum is injected into the mold as shown in FIG. 7 (b). In the state in which the molten metal is injected to some extent, as shown in FIG. 7C, the magnet fixing bolt 20 may be retracted upward. This is to inject molten metal into the second long hole (32). The retraction length of the magnet fixing bolt 20 may be arbitrarily greater than or equal to the thickness of the heating plate 22 '. In this case, the molten metal will be filled higher than the heating plate 22 ', whereby the protruding portion may be closed by cutting after solidification (see FIG. 7 (d)). The problem of elevating the magnet fixing bolt 20 by the elevating plate 24 corresponds to the above-described embodiment and can be variously adjusted. For example, as shown in FIG. 7 (d), only the positioning magnet fixing bolt 22 'may be separated from the upper mold.

The negative pressure through the air hole 50 may be removed during the solidification process or the demolding process. A surface finishing process is followed in the demolded state as shown in FIG.

The present embodiment is characterized in that the heating plate 22 'is fixed inside the mold by using two kinds of forces having different properties. These two forces work simultaneously to complement each other's shortcomings. This is an embodiment to provide a more flawless induction stove molding apparatus.

1 is a cross-sectional view of a mold apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of the heating plate, FIG. 3 is a plan view, and FIG. 4 is a cross-sectional view taken from the A-A direction of FIG. 3.

5 is a cross-sectional view showing the operating state of the mold apparatus step by step.

6 is a cross-sectional view of a mold apparatus according to another embodiment of the present invention.

7 is a cross-sectional view showing the operating state of the mold apparatus step by step.

8 is a plan view of the heat generating plate 22 'used in the present embodiment.

Explanation of symbols on the main parts of the drawings

2 ; Mold apparatus 4; Upper mold

6; Bottom mold 16; magnet

20; Magnet fixing bolt 22,22 '; Heating plate

24; Elevating plate 28; Chapter 1

32; Second chapter 50; Air hole

52; Nipple 54; Air hose

Claims (6)

For casting or die-casting an induction range cooking vessel composed of a container body V1 of a nonmagnetic material and a heating plate 22 of a magnetic material attached to the bottom surface V2 thereof; Consisting of an upper mold 4 and a lower mold 6 for forming a cavity in the molding; Several magnets 16 are installed on the bottom surface 4a of the upper mold 4 so that the heating plate 22 can be attached by magnetic force, and the magnets 16 are operated at a mold temperature. Mold apparatus for forming a cooking vessel for an induction stove, characterized in that the permanent magnet of the samarium cobalt (SmCo) or alico (alnico) series having a magnetic transformation temperature (Curie point) exceeding (400 ~ 500 ℃). The magnet mounting hole (18) is provided in the upper mold (4) in the longitudinal direction; The magnet 16 is a mold apparatus for forming a cooking vessel for an induction stove, characterized in that the screw is screwed to the tip of the magnet fixing bolt 20 is screwed to the magnet mounting hole (18). According to claim 1, wherein several magnet mounting holes (18) in the longitudinal direction are provided in the upper mold (4); The magnet (16) is screwed to the tip of the magnet fixing bolt (20) fitted in the magnet mounting hole (18); All or part of the magnet fixing bolt 20 is fixed to the elevating plate 24 for forming the cooking vessel for the induction stove can move in the vertical direction in accordance with the elevating and raising of the elevating plate (24) Mold apparatus. 4. The mold apparatus for forming a cooking vessel for an induction stove according to claim 3, wherein part or all of the elevating plate (24) is raised during pouring. For casting or die-casting an induction range cooking vessel composed of a container body V1 of a nonmagnetic material and a heating plate 22 of a magnetic material attached to the bottom surface V2 thereof; Consisting of an upper mold 4 and a lower mold 6 for forming a cavity in the molding; Several magnets 16 are installed on the bottom surface 4a of the upper mold 4, and an air hole 50 connected to a vacuum generator capable of sucking air is further installed. The heat generating plate 22 'can be adhered to the bottom face of the upper mold 4 by the attraction force by the magnetic force and the negative pressure; The magnet 16 is for induction stove, characterized in that the permanent magnet of Samarium cobalt (SmCo) or Alnico (alnico) having a magnetization temperature (Curie point) exceeding the operating temperature (400 ~ 500 ℃) of the mold Molding apparatus for cooking vessel molding. A magnetic body heating plate (22, 22 ') which is embedded in a container body (V1) of a nonmagnetic material and its bottom surface (V2) is embedded by attachment or die casting molding; An induction stove cooking vessel manufactured by the mold apparatus according to any one of claims 1 to 5.

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