KR100701624B1 - Making method of oven for heating cooker - Google Patents

Abstract

The method for manufacturing a container of a heating cooker according to the present invention comprises the steps of: (a) forming an inner pot by processing natural stones or ceramics; (b) thermally expanding a separately prepared metal heavy pot so as to surround the inner pot, and vacuum indenting the inner pot; (c) precisely processing the inner diameter of the inner pot; (D) it characterized in that it comprises a step of thermally expanding the separately produced metal outer pot so as to surround the heavy pot, vacuum press-in.

The present invention combines the press-processed heavy pot with the inner pot by the thermo-indentation method, the production process is simple, it is possible to produce a heavy pot of uniform thickness and density, not only to improve productivity, but also to effect the mass production have.

In addition, the present invention can be formed uniformly the thickness of the magnetic outer pot, there is an effect that the uniform heat generated in the entire cooker by the induced current.

Description

Making method of oven for heating cooker

1 to 2 is a process chart showing the inner pot processing process according to the present invention.

Figure 3a to 3c is a process chart showing the thermal indentation process of the heavy pot according to the present invention.

Figures 4a to 4c is a process diagram showing the inner pot precision processing process according to an embodiment of the present invention.

Figure 5a to 5c is a process diagram showing the press molding and inner pot precision processing process of the outer pot according to an embodiment of the present invention.

6a to 6c is a process diagram showing the press molding and inner pot precision processing process of the outer pot according to an embodiment of the present invention.

7 is a perspective view showing a container of a heating cooker according to an embodiment of the present invention.

Figure 8 is a process diagram showing the thermal indentation process of the outer pot according to an embodiment of the present invention.

9 is a cross-sectional view showing the vessel structure of the heating cooker completed in the process of FIG.

Explanation of symbols on the main parts of the drawings

110: inner pot, core 111: inclined surface (chamfered)

120: middle pot 121: bent portion

122: covering 123: edge portion

130: outer pot 140: pressurizing means

141: press 143: pressure roller

150: vacuum base 151: exhaust

153: Press 155: Shock Absorber

160: vacuum chamber 161: exhaust

163: press 165: support means

170: Annotation

The present invention relates to a method for producing a container of a heat cooker.

In general, the rice cooker of the electromagnetic induction heating method (hereinafter referred to as 'IH') is composed of an aluminum body coated with a magnetic film.

Referring to the principle of operation of the IH rice cooker composed of such a configuration, if a high-frequency current flows to the coil built in the cooker body first, the magnetic force lines generated around the coil passes the inner pot to induce a secondary current.

At this time, Joule heat is generated by the secondary current and the resistance of the pot, and the inner pot is heated by the heat to enable cooking of the food.

Such a conventional inner pot for IH rice cooker is produced by using a single stainless steel plate or CLAD (stainless steel + aluminum) plate by the press method, it is easy to manufacture and has an excellent thermal conductivity.

However, as the rice cooker according to the prior art as described above is used to form an artificial coating layer on the inner pot surface formed of metal, there is a problem that the coating layer is peeled off during use, the inner pot can not be used or the cooking efficiency is lowered.

In addition, since the inner pot of the prior art is made of a metal material, the heat transfer rate is excellent, while about 5% of nutrients are lost, and when the rice is preserved, the color of the rice turns yellow and smells, or the rice is dried. There is a problem such as deterioration.

Looking at the manufacturing method of the inner pot for the electromagnetic induction heating rice cooker of another prior art for solving the above problems.

First, the inner container body is processed into a cylindrical shape, and then an aluminum casting is poured to form an aluminum outer body after covering the inner container body with a mold.

Then, after the aluminum outer body is fused, the inner surface of the inner container body is ground to have a predetermined thickness.

Then, a magnetic film capable of generating heat by a magnetic force line caused by an induced current is coated on the surface of the aluminum outer body by a Stan spray coating method.

However, according to the related art of the manufacturing method, shrinkage holes, bubbles, etc. generated during casting are present between the aluminum outer body and the inner container body, so that the thermal conductivity falls due to the floating between the aluminum outer body and the inner container body. have.

In addition, since there is a porosity in the structure of the aluminum outer body, when casting, the thickness of the aluminum outer body was formed thick enough, and there was a hassle of having to perform precision processing again through a separate grinding process. There is a problem in that the defect is caused to penetrate the penetrating the inner container body.

In addition, as the magnetic film is coated by the stan-spray coating method, there is a problem that the magnetic film is peeled off from the aluminum outer body by a high temperature and high pressure environment generated when cooking is not uniform.

An object of the present invention for solving the above problems is to provide a method for manufacturing a container of a heating cooker to produce a heavy pot of a simple, uniform thickness, the manufacturing process, by combining the press-processed heavy pot with the inner pot by a thermal indentation method. Has its purpose.

An object of the present invention for solving the above problems is to provide a method of manufacturing a container of a heating cooker to uniformly generate heat in the entire cooker by the induction current, as the thickness of the magnetic outer pot can be uniformly formed. There is another purpose.

The container manufacturing method of the heating cooker according to the present invention for achieving the above object, (a) processing the natural stone or ceramic to form an inner pot; (b) thermally expanding a separately prepared metal heavy pot so as to surround the inner pot, and vacuum indenting the inner pot; (c) characterized in that it comprises a step of precisely processing the inner diameter of the inner pot.

The container manufacturing method of the heating cooker according to the present invention for achieving the above object, (a) processing the natural stone or ceramic to form an inner pot; (b) thermally expanding a separately prepared metal heavy pot so as to surround the inner pot, and vacuum indenting the inner pot; (c) precisely processing the inner diameter of the inner pot; (D) it characterized in that it comprises a step of thermally expanding the separately produced metal outer pot so as to surround the heavy pot, vacuum press-in.

Here, the step (a) is characterized in that it further comprises the step of processing the inclined surface inclined downward toward any one of the outer peripheral edge or the inner peripheral edge of the inner pot.

Here, after the step (b), by pressing the outer diameter of the upper pot of a separate pot by a separate pressing means characterized in that it further comprises a step of forming a bending surface that is pressed to the upper inclined surface of the inner pot.

Here, after the step (b), it is characterized in that it further comprises the step of pressing the cover so that the upper surface is inclined downward to the inner side of the inner pot of the inner pot of the inner pot and the cover separately prepared to form a slope.

Here, the heavy pot of step (b) is characterized in that the inner pot and vacuum press-in in a heated state to 350 ~ 600 ℃.

Here, the middle pot of step (b) is vacuum press-in and at the same time the bottom surface is characterized in that the pressurized to 50 ~ 200ton pressure on the bottom of the inner pot.

Here, the heavy pot of step (b) is made of a (-) tolerance whose inner diameter is smaller than the outer diameter of the inner pot, characterized in that the inner diameter when thermal expansion under the conditions of 200 ~ 350 ℃ is designed to be smaller than the outer diameter of the inner pot. .

Here, the step of forming a low-melting metal layer between the inner pot and the middle pot before step (b) is characterized in that it further comprises.

Here, the heavy pot of step (b) is made of a multi-metal plate, characterized in that the press-molded.

Here, the outer pot is characterized in that it is vacuum-injected with the pot in a state heated to 450 ~ 800 ℃.

Here, the outer pot of step (d) is vacuum press-in and at the same time characterized in that the bottom surface is pressurized to 50 ~ 200ton pressure on the bottom of the middle pot.

Here, the outer pot of step (d) is made of a (-) tolerance whose inner diameter is smaller than the outer diameter of the heavy pot, characterized in that the inner diameter when the thermal expansion under the conditions of 200 ~ 350 ℃ is designed to be smaller than the outer diameter of the heavy pot. .

Here, the outer pot is a magnetic material, characterized in that the stainless series is used.

The container of the heating cooker manufactured by the manufacturing method according to the present invention is formed by processing a natural stone or ceramic to form an inner pot, and thermally expands a separately prepared metal heavy pot so as to surround the inner pot, followed by vacuum press-fitting. It features.

The container of the heating cooker manufactured by the manufacturing method according to the present invention, by processing a natural stone or ceramic to form an inner pot, and thermally expand a separately prepared metal heavy pot so as to surround the inner pot, vacuum press-in, and the heavy pot After wrapping, a separately manufactured metal outer pot is thermally expanded, and then vacuum-indented.

Here, the inner pot is characterized in that for forming the inclined surface of the upper outer periphery is inclined downward.

Here, the inner pot forms an inclined surface of which the upper outer circumference is inclined downward to the outside, and the heavy pot that is thermally press-fitted to surround the inner pot forms an inclined upwardly to surround the inclined surface. The inner pot is bent vertically at the end of the inclined surface. It characterized in that the vertical surface is formed.

Here, the inner pot forms an inclined surface of which the upper outer circumference is inclined downward to the outside, and the heavy pot that is thermally press-fitted to surround the inner pot forms an inclined upwardly to cover the inclined surface. Forming a reverse inclined surface, characterized in that the vertical surface is bent in the vertical direction at the end of the reverse slope surface is formed.

Here, the outer circumference of the upper end of the middle pot is characterized in that for forming an edge extending in the horizontal direction.

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

1 to 2 is a process chart showing the inner pot processing process according to the present invention, as shown in the figure to form the inner pot 110 by processing the raw material, such as natural stone or ceramics radiated far infrared rays.

The far-infrared radiator (natural stone, ceramic) raw material as described above is plated to a predetermined thickness, preferably 60 to 110mm.

Thereafter, the plate is processed into a cylinder of the appropriate diameter, the cylinder is processed to the inner diameter through the quick dig operation, the processed inner and outer diameter is finished to the shape of the pot.

At this time, the error range managed through finishing is preferably to be within the outer diameter error 0.5mm, the inner diameter error 0.1mm, the height error 0.2mm.

At this time, the speeding operation may be performed in various ways, it is preferable to use a separately produced cutting means 180 as shown in Figure 1b. The cutting means 180 has a configuration in which a plurality of cutting tips 183 are screwed to the outer surface of the "U" shaped holder 181 which is rotated by rotational power.

In addition, the inner pot is processed as described above is preferably chamfered (inclined surface; 111) processing the upper and outer periphery as shown in Figures 2a to 2b.

Figure 3a to 3c is a process chart showing the thermal indentation process of the heavy pot according to the present invention.

As shown in the figure, after the thermal expansion of the separately prepared metal heavy pot 120 to surround the inner pot 110, vacuum press-in.

To this end, the inner pot 110 is mounted on the vacuum base 150 with the top facing the bottom. Subsequently, the inner pot 110 separately manufactured on the inner pot 110 is heated and thermally expanded by a burner or the like (this dashed line shows a state before thermal expansion) and is inserted therein.

The middle pot 120 may be press or cast-molded, and metal such as aluminum (Al) series, copper (Cu) series, and stainless series may be used.

In addition, the heavy pot 120 may be made of one kind of metal as described above, but may be used by pressing a multi-metal plate made by overlapping dissimilar metals.

In this case, it is possible to shorten the manufacturing process by thermally pressing the multiple pots at once.

At this time, the thermal expansion heating temperature of the middle pot 120 may be set differently according to the normal use temperature and material, thickness, capacity of the container.

In an embodiment of the present invention, when the 10-person rice cooker is an aluminum container having a thickness of 1.5 mm to 5 mm, thermal expansion is performed under a heating condition of 350 to 600 ° C.

As shown in FIG. 3B, when the middle pot 120 is thermally press-fitted and the edge portion 123 of the middle pot 120 is in close contact with the bottom surface of the vacuum base 150, the internal air is exhausted through the exhaust unit 151. do. Through the exhaust operation it is possible to eliminate the air layer between the inner pot 110 and the heavy pot 120, when the middle pot 120 is contracted, to increase the adhesion with the inner pot 110, to improve the thermal conductivity do.

In this case, it is important that the heavy pot 120 is designed with a (-) tolerance smaller than the outer diameter of the inner pot 110 when it is contracted, in particular, the middle pot 120 is thermal expansion under the conditions of 200 ~ 350 ℃ general cooker use temperature When the inner diameter is smaller than the outer diameter of the inner pot to prevent the problem that the inner pot 110 and the heavy pot 120 is peeled off.

The present invention as described above, despite the vacuum indentation process, in order to prevent the bottom of the inner pot 110 and the bottom of the middle pot 120 is lifted, as shown in Figures 3a to 3b the middle pot 120 The bottom is pressurized to the bottom of the inner pot 110 by the press 153. At this time, the press 153 preferably has a pressing force of 50 to 200 tons, it can be filled by melting the low-temperature molten metal, that is, tin 170 and the like between the inner pot 110 and the middle pot 120 as shown in Figure 3c. have.

Since the tin 170 is harmless to the human body and has a low melting point, the tin 170 maintains a molten state inside the aluminum middle pot 120 heated and thermally expanded to 350 to 600 ° C., between the inner pot 110 and the middle pot 120. It will serve to fill the gap of the.

Here, the upper surface of the vacuum base 150 is in close contact with the edge portion 123 of the heavy pot 120 during the vacuum exhaust, the role of the packing member to seal the inside of the heavy pot 120 and press the press 153 More preferably, the shock absorber 155 is configured to absorb the shock.

Figures 4a to 4c is a process chart showing the inner pot precision processing process according to an embodiment of the present invention, Figures 5a to 5c is a process chart showing the press molding and inner pot precision processing process of the outer pot according to an embodiment of the present invention, Figure 6a to 6c is a process chart showing the press molding and inner pot precision processing of the outer pot according to the embodiment of the present invention.

As shown in FIGS. 4a to 4c, the inner pot 110 in which the middle pot 120 is thermally pressurized is reworked (precision) to a thickness of 2 to 6 mm suitable for cooking. At this time, the precision machining is preferably used cutting means 180 made of the same configuration as in Figure 1b.

At this time, by forming an inclined surface 111 inclined toward the inner side of the inner circumference of the inner pot 110, the upper surface of the inner pot 110, that is, so that the ground portion with the heavy pot 120 can flow down without accumulation. do.

If the water is accumulated in the upper surface of the inner pot 110, the water is soaked into a fine gap with the middle pot 120, the inner pot 110 and the middle pot 120 in the process of repeating the thermal expansion and condensation process This problem of peeling occurs or causes a problem of lowering the thermal conductivity.

At this time, instead of forming the inner circumferential edge of the inner pot 110 on the inclined surface 111, it may be combined to produce a covering 122 as shown in Figure 4c.

The covering 122 may be press-fitted after the middle pot 120 is thermally press-fitted, but it is preferable to simultaneously heat press-fit with the middle pot 120 in a state in which the covering 122 is coupled to the top of the inner pot 110.

5 to 6 is a process diagram showing the press molding and inner pot precision processing process of the outer pot according to an embodiment of the present invention, as shown in the figure after the thermal press-fit process of the middle pot 120, a separate pressurizing means 140 By pressing the upper outer diameter of the middle pot 120 to be formed so that the bent portion 121 is compressed with the upper inclined surface 111 of the inner pot 110.

The pressing means 140 is used as a press 141 for pressing the entire outer diameter of the heavy pot 120 to a specific shape at a time as shown in Figure 5b, or as shown in Figure 6b to specify the circumference of the heavy pot 120 The pressing roller 143 having the cross-sectional shape may be rotated to form the groove-shaped bent portion 121.

After the bent portion 121 is formed in the outer diameter of the middle pot 120 through the above process, the inner pot 110 is precisely reworked to a thickness suitable for cooking as shown in FIGS. 5C and 6C.

Through the above process to complete the container of the heating cooker as shown in FIG.

7 is a perspective view showing a container of a heating cooker according to an embodiment of the present invention, the container as shown in the figure may be used as an electric heating pressure cooker, or a container for gas heating pressure cooker. At this time, in order to use the container for an induction heating pressure cooker requires a step of thermally press-fitting the magnetic outer pot 130 as shown in FIG.

FIG. 8 is a process diagram illustrating a thermal indentation process of an outer pot according to an exemplary embodiment of the present invention, as shown in the drawing, to vacuum-inject the outer pot 130 of a magnetic material separately manufactured to surround the middle pot 120.

The vacuum indentation process as described above is performed in a separate vacuum chamber 160 as shown in FIG.

First, a combination of the inner pot 110 and the heavy pot 120 is placed on the bottom of the vacuum chamber 160 so that the opening faces the bottom. Thereafter, the separately molded outer pot 130 is press-fitted to the outer surface of the middle pot 120, and the outer pot 130 is manufactured with a (-) tolerance whose inner diameter is smaller than the outer diameter of the heavy pot 120.

When the outer pot 130 is heated to 450 ~ 800 ℃ using a separate heating means not shown, the thermal expansion is made in a state capable of coupling to the heavy pot 120, the exhaust portion of the air inside the vacuum chamber 160 Evacuate through 161 to form a vacuum and then press in. At this time, the bottom of the outer pot 130 is pressurized to a pressure of the press 165 of 50 ~ 200ton to be in close contact with the bottom of the heavy pot 120.

At this time, the outer pot 130 is being supported by a separate support means 170 until the press-fit is made.

When the vacuum is formed as described above, it is possible to prevent the air layer from being formed between the outer pot 130 and the heavy pot 120.

In addition, the outer pot 130 is designed so that the inner diameter when the contraction is smaller (-) tolerance than the outer diameter of the heavy pot 120.

This, the inner pot of the outer pot 130 when the outer pot 130 is thermally expanded under the conditions of the cooker temperature 200 ~ 350 ℃ should be smaller than the outer diameter of the heavy pot to prevent the problem that the middle pot 120 and the outer pot 130 peel off. Will be.

At this time, the outer pot 130 is preferably made of a stainless material, the stainless plate is beautiful surface, press molding and cast molding.

The outer pot 130 as described above may be separately manufactured and thermally press-fitted in the same manner as described above, but in the press process of forming the shape of the heavy pot 120 using multiple metal plates, the molds are molded together to form the middle pot 120. When thermally press-fitted, it may be possible to press-fit together.

The thickness of the outer pot 130 as described above is determined by the capacity of the cooker and the amount of heat required for this, it is preferable to produce a thickness of 0.3mm ~ 2mm.

Figure 9 is a cross-sectional view showing a vessel structure of the heating cooker completed in the process of Figure 8, the present invention as shown in the figure is able to uniformly form the thickness of the outer pot 130, by the induced current Uniform heating occurs in the entire rice cooker.

In addition, the inner and outer pots 110, the middle pot 120, the outer pot 130 and the material and the thermal expansion rate can be prevented from peeling between the materials, respectively. In particular, it is possible to prevent the problem that the outer pot of the prior art, that is, the magnetic coating film is peeled off.

The present invention combines the press-processed heavy pot with the inner pot by the thermo-indentation method, the production process is simple, it is possible to produce a heavy pot of uniform thickness and density, not only to improve productivity, but also to effect the mass production have.

In addition, the present invention can be formed uniformly the thickness of the magnetic outer pot, there is an effect that the uniform heat generated in the entire cooker by the induced current.

Claims (20)

(a) processing the natural stone or ceramic to form an inner pot; (b) thermally expanding a separately prepared metal heavy pot so as to surround the inner pot, and vacuum indenting the inner pot; (c) precisely processing the inner diameter of the inner pot through a quick breaking process; Method for producing a container of heat cooker comprising a. (a) processing the natural stone to form an inner pot; (b) thermally expanding a separately prepared metal heavy pot so as to surround the inner pot, and vacuum indenting the inner pot; (c) precisely processing the inner diameter of the inner pot through a quick breaking process; (d) thermally expanding a separately manufactured metal outer pot so as to surround the heavy pot, and vacuum-injecting it; Method for producing a container of heat cooker comprising a. The method according to claim 1 or 2, The step (a) is a method for manufacturing a container of a heating cooker, further comprising the step of processing the inclined surface inclined downward toward any one of the outer circumferential edge or the inner circumference of the inner pot. The method according to claim 1 or 2, After the step (b), by pressing the outer diameter of the upper pot of the pot with a separate pressing means to form a bent surface to be pressed to the upper inclined surface of the inner pot is characterized in that it further comprises a container manufacturing method. The method according to claim 1 or 2, After the step (b), the manufacturing process of the heating cooker further comprises the step of press-fitting the covering made separately so that the upper surface is inclined downward inward to the inner surface of the inner pot of the inner pot and the inner pot at the same time. Way. The method according to claim 1 or 2, The middle pot of step (b) is a container manufacturing method of a heating cooker, characterized in that the inner pot and vacuum press-in the heated state at 350 ~ 600 ℃. The method according to claim 1 or 2, The middle pot of step (b) is vacuum press-in and at the same time the bottom surface is pressurized to 50 ~ 200ton pressure on the bottom surface of the inner pot, characterized in that the cooking method of the cooking vessel. The method according to claim 1 or 2, The middle pot of step (b) is made of a (-) tolerance whose inner diameter is smaller than the outer diameter of the inner pot, but characterized in that the inner diameter of the middle pot when the thermal expansion under the conditions of 200 ~ 350 ℃ is designed to be smaller than the outer diameter of the inner pot Method for producing a container of a heating cooker. The method according to claim 1 or 2, The method of claim 1, wherein the step of forming a low melting point metal layer between the inner pot and the middle pot before the step (b). The method according to claim 1 or 2, The heavy pot of step (b) is made of a multi-metal plate, the method of manufacturing a container of a heating cooker, characterized in that the press-molded. The method of claim 2, Method for producing a container of a heating cooker, characterized in that the outer pot is heated to 450 ~ 800 ℃ the middle pot and vacuum press-in. The method of claim 2, The outer pot of step (d) is vacuum-pressured at the same time the bottom surface is pressurized to 50 ~ 200ton pressure on the bottom of the middle pot vessel manufacturing method of the heating cooker, characterized in that. The method of claim 2, The outer pot of step (d) is made of a (-) tolerance whose inner diameter is smaller than the outer diameter of the heavy pot, characterized in that the inner diameter of the outer pot when the thermal expansion under the conditions of 200 ~ 350 ℃ is designed to be smaller than the outer diameter of the heavy pot Method for producing a container of a heating cooker. The method of claim 2, The outer pot is a magnetic material, a method of manufacturing a container of a heating cooker, characterized in that a stainless series is used. Process the natural stone or ceramic to form an inner pot, and heat expansion of the separately prepared metal heavy pot so as to surround the inner pot, the container of the heating cooker, characterized in that consisting of a vacuum press-in. Process the natural stone or ceramic to form an inner pot, and thermally expand the separately made metal heavy pot so as to surround the inner pot, and vacuum press-in, and thermally expand the separately made metal outer pot so as to surround the middle pot, followed by vacuum indentation. A container of a heating cooker, characterized in that the configuration. The method of claim 15 or 16, The inner pot is a container of a heating cooker, characterized in that for forming an inclined surface inclined downward inward to the outer peripheral edge. The method of claim 15 or 16, The inner pot forms an inclined surface of which the upper outer circumference is inclined downward to the outside, and the heavy pot that is thermally press-fitted to surround the inner pot forms an inclined upwardly inward to surround the inclined surface. Container for a heat cooker, characterized in that to be formed. The method of claim 15 or 16, The inner pot forms an inclined surface of which the top outer circumference is inclined downward to the outside, and the middle pot that is thermally press-fitted to surround the inner pot forms an inclined upwardly to cover the inclined surface. And forming a vertical surface that is bent in a vertical direction at the end of the reverse slope surface. The method of claim 15 or 16, Container of a heating cooker, characterized in that the outer peripheral edge of the upper pot to form an edge extending in the horizontal direction.

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