KR101092702B1 - Mold apparatus for forming cooking vessel and manufacture method using the same - Google Patents

Abstract

PURPOSE: A mold for making a gravity casting type cooker and a cooker manufacturing method using the same are provided to prevent the degradation and dissipation of a magnetic force in case of long time use by attaching a magnetic heating plate to an upper mold via an electromagnet module and a magnetic medium. CONSTITUTION: A cooker manufacturing method using a mold for making a gravity casting type cooker is as follows. A magnetic heating plate is set in a lower mold(3). An upper mold comprising a plurality of magnetic media(24) connected to an electromagnet module(25) and a control box(26) for supplying power to the electromagnet module is meshed with the lower mold and power is supplied to the electromagnet module through the control box so that the magnetic heating plate is attached to the magnetic media. Molten non-ferrous metal is injected into the meshed upper and lower molds and voltage is alternately applied to the electromagnet module for a set time, thereby casting a cooker with the magnetic heating plate exposed on the bottom. The cooker is separated from the upper and lower molds.

Description

Mold apparatus for forming cooking vessel and manufacture method using the same}

The present invention relates to a cooking vessel manufacturing mold and a cooking vessel manufacturing method, and more particularly, to a gravity casting cooking vessel manufacturing mold and a cooking vessel manufacturing method using the gravity casting cooking vessel manufacturing mold.

In general, cooking vessels are used to cook food by induction heating and / or flame heating, such as rice cookers, pots, and frying pans.

Here, an electronic cooker such as an induction range used for induction heating has a coil for generating a magnetic field when a high voltage is applied to the induction heating, and the induction stove induces a magnetic field when a high voltage is applied to the coil. In this case, the metal body in the region affected by the magnetic field is heated. Since the electronic cooker does not generate any flame or harmful gas, there is no risk of fire, and there is no carbon monoxide that is inevitably generated when gas is used as a heat source. have. In addition, the electronic cooker does not cause burns even when the grille is touched while the container is being heated.There is no spark, so there is no risk of fire or explosion, and the burner does not burn when body parts come into contact with the grille while the power is supplied. It has a merit and is being used a lot recently.

In this case, the cooking vessel used in the electronic cooking device such as an induction stove is limited to a magnetic cooking container having a high magnetic field sensitivity. The magnetic material such as iron contained in the cooking container is heavier than the nonmagnetic material such as aluminum or aluminum alloy. Has a fundamental disadvantage.

On the other hand, a cooking container made of a nonmagnetic material such as aluminum or an aluminum alloy has excellent moldability and thermal conductivity, and thus is widely used for flame heating cooking. However, such nonmagnetic cooking containers have a low magnetic field sensitivity and cannot be heated by an induction stove.

In order to solve this problem, a cooking vessel manufactured by spraying a magnetic body or forming a plating of a magnetic body on a bottom surface of a nonmagnetic container body has been proposed. However, such a cooking container has a problem that the sprayed or plated magnetic material is easily peeled off.

Alternatively, a cooking vessel prepared by drilling a hole in a magnetic heating plate and having a projection fitted into the hole in a nonmagnetic container body corresponding thereto, and then pressing them is proposed. Such conventional cooking vessels are more durable than conventional cooking vessels, but peeling phenomena due to the difference in shrinkage between different metals still exist.

Meanwhile, in order to solve the above problems, Patent No. 611646 (August 11, 2006), registered with the Korean Intellectual Property Office, discloses that a metal plate body (magnetic heating plate) exposed to the bottom of the cooking vessel is formed during the casting molding of the cooking vessel. The induction stove cooking vessel and its manufacturing method, which are placed inside the mold for preparing the cooking vessel with metal flakes and are cast, have been limited.

However, the Republic of Korea Patent No. 611646 arranges a plurality of the non-ferrous metal flakes in the mold during the manufacturing process to expose a metal plate (magnetic heating plate) to the bottom surface of the cooking vessel, and the metal plate body to be horizontal on the non-ferrous metal flakes (Magnetic heating plate) must go through the step of placing the manufacturing method is cumbersome, if the level is not properly made, there is a problem that a defect occurs.

In addition, the Republic of Korea Patent No. 611646 has a problem that the design of the metal plate (magnetic heating plate) is followed as the metal plate is simply placed on the mold by the non-ferrous metal flakes. In other words, in order to expose the metal plate (magnetic heating plate) to the bottom of the cooking vessel, the non-ferrous metal flakes must be supported at a predetermined height on the mold by using the non-ferrous metal flakes as a medium. Following this, in order to solve this problem, there is a problem that a restriction such as that the cross section must be configured in the form of "a" as shown in Figure 6 of Korean Patent No. 611646.

On the other hand, Republic of Korea Patent Publication No. 2004-23120 (published on March 18, 2004) in the die casting mold consisting of a moving mold and a fixed mold, the fixed mold is to form a magnet in the recessed portion to allow the magnetic metal plate to be adhesively fixed 'Die-casting mold for forming kitchen cooking utensils' has been proposed. In addition, the Republic of Korea Patent No. 893105 has been proposed a 'mold apparatus for forming a cooking vessel for an induction stove to attach a heating plate by a magnetic force by installing a number of magnets on the bottom of the upper mold.

However, Korean Patent Laid-Open Publication No. 2004-23120 and Korean Patent Registration No. 893105 have a structure in which a permanent magnet is installed in a mold to attach a magnetic metal plate or a heating plate, so that the magnetic force of the magnet decreases during mass production over a long period of time. It has a fundamental problem of being lost. Although, in the Republic of Korea Patent Publication No. 2004-23120 and the Republic of Korea Patent No. 893105, the alnico series permanent magnet or samarium cobalt (SmCo) series of permanent magnets are applied to prevent magnetic extinction at high temperature. In case of prolonged use, demagnetization and loss of magnetism are essential.

Thus, the present invention was made to solve the general problems of the existing method of manufacturing a cooking vessel,

The problem to be solved by the present invention is to attach the magnetic heating plate to the upper mold by using an electromagnet and a magnetic medium that does not lose the magnetic force even at high temperature to improve the durability by preventing the magnetic force is lowered or extinguished even during mass production for a long time The present invention provides a method for manufacturing a cooking vessel using a gravity-casting cooking container manufacturing mold and a gravity-casting cooking container manufacturing mold.

Another problem to be solved by the present invention is to produce the bottom surface of the cooking vessel by the semi-solid method by performing the electromagnetic stirring by alternately applying the power to a plurality of electromagnet modules in the reaction high section of the molten metal surface state The present invention provides a method for manufacturing a cooking vessel using a gravity-casting cooking container and a method for manufacturing a gravity-casting cooking container which can be expected to improve the thermal conductivity and thereby improve the thermal conductivity.

As a specific means of the present invention for solving the above problems;

In the cooking vessel manufacturing mold for manufacturing the cooking vessel by gravity casting method is composed of the upper mold provided with the molten metal inlet and the lower mold installed magnetic heating plate,

The upper mold is provided with a plurality of magnetic media for attaching the magnetic heating plate to the inside of the upper mold, an electromagnet module coupled to each of the magnetic media is installed outside the upper mold, the electromagnet module supplies power Gravity casting cooking container manufacturing mold is characterized in that it is electrically connected to the control box.

In a preferred embodiment, the magnetic medium is a magnetic metal rod, one end of which is installed in the upper mold in a vertical insertion shape, the other end of which protrudes out of the upper mold, and the electromagnet module protrudes out of the upper mold. The bobbin inserted into the bobbin and the coil wound around the bobbin, the installation position of the magnetic medium can be arranged to correspond to the position range in which the magnetic heating plate is attached so that the magnetic heating plate is attached to the lower mold.

Alternatively, the manufacturing method using the gravity-casting cooking vessel manufacturing mold

Mounting a magnetic heating plate on the lower mold;

The magnetic heating plate by supplying power to each of the electromagnet modules through the control box in the state of combining the upper mold with a plurality of magnetic media connected to the electromagnet module and the control box for supplying power to the electromagnet module. Attaching to the magnetic medium; And

Casting a cooking vessel such that the magnetic heating plate is exposed to the bottom surface by alternately applying power to each of the electromagnet modules for a predetermined time while injecting the non-ferrous metal molten metal into the molded upper and lower molds; And

Demolding the cooking vessel from the upper and lower molds; It is implemented to include.

In a preferred embodiment, the time for alternately applying power to the electromagnet module may be performed from the time of injecting the non-ferrous metal molten metal to the reaction high section of the non-ferrous metal molten metal.

As described above, the method for manufacturing a cooking vessel using the gravity-casting cooking vessel manufacturing mold and the gravity-casting cooking vessel manufacturing mold according to the present invention is a magnetic force even when used for a long time by attaching a magnetic heating plate to the upper mold through an electromagnet module and a magnetic medium. There is an advantage that can prevent degradation and magnetic extinction. In addition, in the present invention, by applying a plurality of electromagnet modules alternately in the reaction high section of the molten metal to perform electromagnetic agitation, the bottom portion of the cooking vessel can be manufactured by the semi-solid method to improve the surface state and thus It can be expected to improve the thermal conductivity according to.

Figure 1 is a side cross-sectional view for explaining the overall configuration of the gravity casting cooking container manufacturing mold according to the present invention.
Figure 2 is a configuration diagram for explaining the electromagnet module and control box installed in the upper mold in the gravity-casting cooking vessel manufacturing mold according to the present invention.
3 is a side cross-sectional view for explaining a state in which the upper and lower molds are separated in the gravity casting cooking vessel manufacturing mold according to the present invention.
4 is a side cross-sectional view for explaining a state in which the upper and lower molds are molded in the gravity-casting cooking container manufacturing mold according to the present invention.
5 is a side cross-sectional view for explaining a state in which the magnetic heating plate is attached to the magnetic medium installed in the upper mold in the gravity casting cooking container manufacturing mold according to the present invention.
6 is a side cross-sectional view for explaining a state in which molten metal is injected in the gravity casting cooking container manufacturing mold according to the present invention.
Figure 7 is a bottom perspective view for explaining the cooking vessel manufactured by the gravity-casting cooking vessel manufacturing mold according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Here, the cooking vessel manufacturing mold to which the present invention is applied may be defined as a manufacturing mold applied to the gravity casting formula, which is a method of filling the empty space of the mold using gravity casting formula, for example, the fluidity of the molten metal, and a low pressure casting formula. Note that it is different from manufacturing mold or pressure casting (die casting method) manufacturing mold.

1 and 2, the gravity casting cooking container manufacturing mold (1) of the present invention is a lower mold (3), the magnetic heating plate 4 is installed, and the upper mold (2) is provided with a molten metal inlet (23) The upper mold 2 further includes a magnetic medium 24, an electromagnet module 25, and a control box 26.

Gravity casting manufacturing mold (1) of the present invention is largely classified into an upper mold (2) and a lower mold (3), typically the upper mold (2) is provided with a cavity core (21) and molten metal inlet (23) The upper core 22, the lower mold 3 is composed of a stripper 31 and the insert core (32). At this time, the lower mold (3) is a fixed mold, the upper mold (2) is a moving mold is connected to a separate moving means (not shown in the figure.) To the mold or release the lower mold (3), Lowering operation

The magnetic medium 24 is provided at a plurality of upper cores 22 constituting the upper mold 2, for example, the upper mold 2 at predetermined intervals. The magnetic medium 24 is a magnetic metal rod made of SUS440 or other alloy material containing iron, which is magnetic, and is installed in a vertical insertion form on the upper mold. For this purpose, the upper core 22 of the upper mold The magnetic medium can be installed in an interference fit type (inserted with the upper core in a heated state) by providing a vertical hole, or a screw thread can be provided in the vertical hole and a screw thread can be installed in the magnetic medium to be screwed. have. At this time, the magnetic medium 24 may be arranged on the outer periphery of the molten metal inlet, a plurality, preferably four to six on the upper core 22 of the upper mold (2), the upper mold (2) 4 ~ 10 can be installed according to the size, the installation position is the position where the magnetic heating plate (4) is placed so that the magnetic heating plate (4) is installed in the lower mold (3) Are arranged within a range corresponding to In addition, one end of the magnetic medium 24 installed as described above, that is, one end inserted into the upper mold 2: the upper core 22 coincides with the lower surface of the upper mold 2: the upper core 22. The other end has a configuration in which the other end protrudes (may be bent at a predetermined angle) at a predetermined length from the upper side of the upper mold (2: upper core 22).

The electromagnet module 25 is electrically connected to each of the magnetic media 24 protruding outward from the upper side of the upper mold 2. The electromagnet module 25 is configured to include a bobbin 251 inserted into the magnetic medium 24 and a coil 252 wound around the bobbin 251 and connected to an external power source.

The control box 26 is installed at a place separate from the upper and lower molds 2 and 3, for example, a place that is easy for the operator to operate, and the control box 26 is a coil of the electromagnet module 25. In order to supply external power to the 252 has a configuration electrically connected to the coil 252 of each electromagnet module 25. The control box 26 supplies power to the coils 252 of the electromagnet module 25, and supplies power to the coils 252 of all the electromagnet modules 25 for a predetermined time, and then each electromagnet module. A control circuit (not shown in the figure) programmed to supply power alternately with (25) is incorporated. In addition, the control circuit of the control box 26 may further include a timer to supply or alternately supply power to the electromagnet module 25 for a predetermined time.

Meanwhile, the magnetic heating plate 4 seated on the upper surface of the insert core 32 constituting the lower mold 3, for example, the lower mold 3, is a thin metal plate material made of magnetic material, and has heat resistance and high temperature corrosion resistance. An excellent iron plate or an aluminum plated steel sheet can be used, and preferably stainless steel such as SUS430, SUS410S, ASTM TP 409, or the like can be used. That is, ferritic stainless steel that is ferromagnetic in stainless steel can be used. At this time, the magnetic heating plate 4 is formed with a plurality of long holes 41, that is, a plurality of long holes 41 that is filled with aluminum to improve the bonding force with the bottom surface of the container, in the present invention, the magnetic heating plate 4 is As the magnetic medium 24 is fixed to the upper mold 2, various forms of the magnetic heating plate 4 or the number of holes may be applied.

Thus, the cooking vessel manufacturing method through the gravity-casting cooking vessel manufacturing mold according to the present invention having the configuration as described above will be described.

Referring to Figures 3 to 6, the manufacturing method of the present invention is implemented including a magnetic heating plate mounting step, magnetic heating plate attachment step, casting step, demolding step.

In the mounting step of the magnetic heating plate 4, the magnetic heating plate 4 is seated on the upper surface of the insert core 32 of the lower mold 3. In this case, the magnetic heating plate 4 may be seated in the center of the insert core 32, and a mounting means such as a separate jig may be used to mount the magnetic heating plate in place. (See FIG. 3).

The magnetic heating plate 4 is attached to the upper mold (2) to the lower mold (3) on which the magnetic heating plate (4) is seated as described above, but the upper mold (2) is connected to the electromagnet module (25) Since the magnetic medium 24 and the control box 26 for supplying power to the electromagnet module 25 is provided, the upper and lower molds (2, 3) in the combined state through the control box 26 The magnetic heating plate 4 is fixed to the upper core 22 of the upper mold 2 by supplying power to all the electromagnet modules 25 to attach the magnetic heating plate 4 to the magnetic medium 24. (See Figures 4 and 5.)

The casting step is performed by alternately applying power to each electromagnet module 25 for a predetermined time while injecting a non-ferrous metal molten metal (such as aluminum molten metal) into the molded upper and lower molds (2,3). The cooking vessel 5 is cast so that the magnetic heating plate 4 is exposed to the bottom surface (see FIG. 6).

In this case, the time of alternately applying power to the electromagnet module 25 may be performed from the time of injecting the non-ferrous metal molten metal to the reaction high section of the non-ferrous metal molten metal, which is 1/2 of the total casting time. Can be defined That is, if the total casting time is 2 minutes, the reaction section of the non-ferrous metal molten metal corresponds to the time from injection point to 1 minute. In addition, the alternating power supply of the electromagnet module 25 performed by the control circuit of the control box 26 as described above may be regular or irregular. In other words, the form of alternating power to the four electromagnet modules, for example, "1 off / 2, 3, 4 on", "2 off / 1, 3, 4 on", "3 off / 1, 2, 4 times ", or a regular form, such as randomly supplying power to one or two electromagnet modules, the rest may be an irregular form that does not supply power.

Here, when power is alternately applied to the electromagnet module 25 in the reaction high section of the molten metal as described above, as a result, the magnetic medium 24 is electromagnetized to generate a magnetic field, and at the same time, a minute vibration (60 Hz) )) Is generated, which causes electromagnetic stirring of the molten solid state of the reaction.

Accordingly, in the casting step of the present invention, the bottom surface of the cooking vessel is cast by a semi solid (SSF (semi solid forged) method) as electromagnetic stirring is performed through the magnetic medium 24. In this way, when the molten metal is stirred in the reaction solid state using the semi-solid method, the macrostructure of the solute atom is formed by forming the spherical primary particles and the liquid surrounding the primary crystal instead of the coarse dendritic structure that appears in the ordinary cast product. Since the metal structure is minimized, the bottom surface of the cooking vessel can obtain the effect of improving the surface texture state and thus the thermal conductivity. In other words, by improving the surface condition and surface texture of the bottom of the cooking vessel, high thermal conductivity can be obtained, thereby reducing cooking time, and improving the surface structure, and thus, the coating lasts for a long time. have.

The demolding step demolds the cooking vessel 5 from the upper and lower molds 2 and 3. This is implemented by releasing the upper mold 2 from the lower mold 3 and then demolding the cooking vessel 5 of the lower mold 3, that is, the insert core 32. The cooking vessel 5 manufactured as described above has a structure in which the magnetic heating plate 4 is exposed to the bottom surface as shown in FIG. 7, as well as heating by magnetic field induction, as well as flame heating. Even in the case of use, the thermal conductivity can be improved by improving the texture of the bottom surface as described above.)

Therefore, the manufacturing method according to the present invention implemented as described above by attaching the magnetic heating plate 4 to the upper mold (2) using the electromagnet module 25 and the magnetic medium 24, the magnetic force is not deteriorated or extinct continuously It has the advantage that can be used as, by implementing the semi-solid method through the electromagnetic stirring in the reaction high section can improve the physical properties of the bottom surface of the cooking vessel to obtain a high thermal conductivity and processability.

On the other hand, the above-described embodiments are only given specific examples to enable those skilled in the art to easily understand and implement the present invention, and are not intended to limit the scope of the present invention. Therefore, it should be noted that various modifications or changes to the above-described embodiments may be applied to a mold for manufacturing a cooking container with a low pressure casting type by providing a molten metal inlet at a lower mold. The scope of the invention is defined in principle by the claims that follow.

1: Manufacturing mold 2: Upper mold
3: lower mold 4: magnetic heating plate
5: cooking container 21: cavity core
22: upper core 23: molten metal inlet
24: magnetic medium 25: electromagnet module
26: control box 31: stripper
32: insert core 41: long
251 bobbin 252 coil

Claims (4)

In the cooking vessel manufacturing mold for manufacturing the cooking vessel by gravity casting method is composed of the upper mold provided with the molten metal inlet and the lower mold installed magnetic heating plate,
The upper mold is provided with a plurality of magnetic media for attaching the magnetic heating plate to the inside of the upper mold, an electromagnet module coupled to each of the magnetic media is installed outside the upper mold, the electromagnet module supplies power Gravity casting cooking vessel manufacturing mold, characterized in that electrically connected to the control box.
The method of claim 1,
The magnetic medium is a magnetic metal rod, one end of which is installed in the upper mold in a vertical insertion form, the other end protrudes out of the upper mold, and the electromagnet module is inserted into the magnetic medium protruding out of the upper mold. Composed of a coil wound on the bobbin, the installation position of the magnetic medium is a gravity-casting cooking vessel, characterized in that arranged to correspond to the position range in which the magnetic heating plate is attached so that the magnetic heating plate is installed in the lower mold Manufacturing mold.
Mounting a magnetic heating plate on the lower mold;
The magnetic heating plate by supplying power to each of the electromagnet modules through the control box in the state of combining the upper mold with a plurality of magnetic media connected to the electromagnet module and the control box for supplying power to the electromagnet module. Attaching to the magnetic medium;
Casting non-ferrous metal molten metal into the molded upper and lower molds by alternately applying power to each of the electromagnet modules for a predetermined time and casting the cooking vessel so that the magnetic heating plate is exposed to the bottom surface through an electromagnetic stirring process. ; And
Demolding the cooking vessel from the upper and lower molds; Cooking vessel manufacturing method comprising a.
The method of claim 3, wherein
The time for applying power alternately to the electromagnet module is a cooking vessel manufacturing method, characterized in that performed from the time of injecting the non-ferrous metal molten metal to the reaction high section of the non-ferrous metal molten metal.

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