KR102570788B1 - Method for processing a bottom surface of pan - Google Patents

Abstract

The present invention relates to a method for processing the bottom surface of a cooking vessel.
The present invention provides a mold in which hexagonal intaglios are formed on the surface of a disk and dot intaglios formed in the center of each hexagon are formed, and a triple clad plate material is prepared with aluminum as an intermediate layer and a stainless layer bonded to the inside and outside. Step of mounting the mold in a mold support frame provided on a movable support plate of a rolling roll, fixing the surface of the material clad plate in an overlapped state in surface contact with a mold mounted in the mold support frame. , Step of operating the rolling roll device so that rolling is performed by moving the movable support plate together with the pressure rotation of the lower roll, forming a non-stick coating layer on the surface on which the embossed and intaglio portions of the material clad plate are formed, and the upper surface of the embossed portion and selectively polishing and removing the coating layer applied thereon.
In the cooking vessel bottom surface processing method of the present invention, as a result of plastic deformation of the surface of the material clad plate by cold rolling using a rolling roll device, a bottom surface portion in which embossed portions and intaglio portions are continuously repeated is generated, so that the bottom surface through conventional etching Compared to the secondary concave-convex surface formation method, the working process and working time are considerably shortened.

Description

Method for processing the bottom surface of a cooking vessel {METHOD FOR PROCESSING A BOTTOM SURFACE OF PAN}

The present invention relates to a cooking container used for cooking food, and more particularly, to a center of a concave portion surrounded by hexagonal embossed portions continuous in all directions by rolling on the surface of a triple clad plate with an aluminum layer interposed therebetween. It relates to a method for processing the bottom surface of a cooking vessel in which embossed dots are formed and a non-stick coating layer is applied only to the concave portion.

In the case of a cooking container such as a metal pan or pot in which food is cooked by receiving heat from a heating device when food is cooked, the food is often burned to the surface of the bottom of the container during cooking. Intended cooking is not performed properly, and it is not easy to remove the burned ingredients when washing such a cooking container, which entails additional time and effort.

As a way to solve the problem of sticking to the bottom of the cooking vessel, a coating layer having a non-stick function is formed on the bottom of the cooking vessel to block direct contact of ingredients with the surface of the metal cooking vessel, thereby preventing non-stick properties In addition, a cooking vessel with improved corrosion resistance has been widely used.

The non-stick coating layer for the cooking container is formed of Teflon containing a fluororesin as a main component or various materials and laminated forms including a laminated form of the resin layer and a ceramic layer are known, and development of a new non-stick coating layer is currently underway. continues steadily until

On the other hand, the non-stick coating layer exhibits a generally satisfactory function at the beginning of use of the cooking vessel, but as the use time elapses, other objects that come into contact with the coating layer during the cooking or washing process, in particular, metal cooking utensils or cleaning brushes In the process of contact with a scrubber, etc., sometimes the non-stick coating layer is damaged or peeled off due to impact or friction applied to the coating layer from the outside, so that the original function is not performed properly, and eventually the useful life of the cooking vessel is reached. It will be a daily experience.

As one of the recent trends, as a way to solve the above problems while maintaining the advantages of the non-stick coating layer, the bottom surface of the cooking vessel coated with the non-stick coating layer is formed as a concavo-convex surface, so that the food to be cooked and the bottom surface of the container By reducing the contact area between the surfaces, it reduces the possibility of cooking objects sticking to the bottom surface, and the non-stick coating layer forms a non-flat bottom surface that reduces the possibility of contact with or impact from external objects such as rakes and cleaning utensils. Several techniques are known.

As one of the prior art related to the cooking vessel having the non-flat bottom surface, Patent Registration No. 10-1392095 attaches a film having a perforated pattern to a stainless plate body to form a resist ink layer pattern, and spraying an etchant thereon By allowing selective etching to take place, the surface of the hexagonal inner space except for the hexagonal hexagons and the dot portion in the center of the hexagonal area is cut out, so that the relatively protruding hexagonal and dot embossed areas and the relatively depressed interior of the hexagonal area are removed. A method of manufacturing a bottom surface of a cooking vessel by forming a non-flat bottom surface made of concave portions and forming a non-stick coating layer thereon is disclosed.

And, in Registered Patent No. 10-1894663, similarly to Patent No. 10-1392095, a resist ink layer is formed on the surface of a stainless plate body and impregnated in a corrosion bath filled with an etchant so that selective surface corrosion is achieved on the bottom surface A non-flat surface in which the embossed portion and the concave portion are continuous is obtained, and the first coating is selectively applied only to the concave portion from the non-flat bottom surface, and then a primer coating layer, an intermediate layer, and a top coating layer are sequentially formed to form a double-layered coating layer. A method for manufacturing a cooking container is introduced.

However, in the method of forming a non-flat surface by exposing the bottom surface of the container to an etching solution and causing the protruding embossed portion to become relatively prominent as a result of selective corrosion, selective etching is performed on the surface of a relatively thick stainless steel plate body made of a single material. It is necessary to go through several cumbersome steps until the process of forming a resist ink pattern using a film as a process and etching by selective corrosion by exposure or immersion in an acidic etchant according to the pattern formed, and the final etching by the etchant In addition to requiring considerable time to complete, the need for improvement in terms of economic feasibility and production cost has been demanded because it also occupies a wide working space for performing the process.

In addition to this, in the non-flat bottom surface formation method by the above etching method, since the etchant used for surface etching is an acidic solution, chronic environmental problems are followed in the treatment and disposal of the etchant used.

The present invention was created in view of the above disadvantages and problems pointed out in the conventional method of forming the bottom surface of a cooking vessel into a non-flat concavo-convex surface using an etchant, and chemical etching acting as a clue to the various problems Rather than forming a bottom surface of a container with a concave-convex surface through a physical method, cold rolling as a physical method protrudes relatively to the bottom surface of the material in all directions, continuous hexagonal embossed portions, concave portions surrounded by embossed portions, and embossed dots in the center of the concave portions. It is an object of the invention to provide a method for processing the bottom surface of a cooking vessel to form a non-flat bottom surface comprising a.

Another object of the present invention is to form a non-flat surface having a concavo-convex pattern on the bottom surface by the above rolling by using aluminum, which is a ductile material with excellent plastic workability, as an intermediate layer, rather than a single-material metal plate. , To provide a method for processing the bottom surface of a cooking vessel in which a triple clad plate to which a stainless metal sheet is bonded is provided as a material to be processed so that a smooth non-flat surface can be formed in a short time.

The bottom surface processing method of the cooking vessel for achieving the above objects of the present invention; Preparing a mold in which hexagonal intaglios continuous in all directions and dot intaglios formed at the inner center of each hexagon are formed on the surface of a flat disc; Preparing a material clad plate by cutting a triple clad plate in which metal layers other than aluminum are bonded to upper and lower layers using aluminum as an intermediate layer; Mounting the mold in a mold support frame provided on a movable support plate of a rolling roll device; placing the surface of the material clad plate on a mold mounted in the mold support frame; Operating a rolling roll device in a state where one edge of the material clad plate placed in the mold is located under the lower roll of the rolling roll so that rolling is performed by moving the movable support plate together with the pressure rotation of the lower roll; correcting warpage of the material clad plate by passing the material clad plate rolled from the mold through a leveling machine; Forming a non-stick coating layer by spraying and drying a coating liquid on the rolling surface of the material clad plate; Polishing and removing the coating layer applied to the upper surface of the embossed portion using a polishing machine; drawing the material clad plate in such a way that the surface on which the embossed and intaglio portions are formed has an internal volume constituting the bottom surface of the container; made including

The material clad plate of the present invention is one of the characteristic configurations of the present invention, and is composed of a 3-ply clad plate in which upper and lower stainless layers are bonded to an aluminum intermediate layer. At this time, the total thickness of the triple clad plate is It is preferably in the range of 2.0 to 3.0 mm, and the thickness of the aluminum intermediate layer is preferably greater than the combined thickness of the upper and lower stainless layers.

More preferably, the total thickness of the triple clad plate is about 2.3 mm, the upper stainless layer is 304 series with a thickness of 0.4 mm, the aluminum intermediate layer is 1.4 mm thick, and the lower stainless layer is 430 series with a thickness of 0.5 mm.

In particular, when the stainless lower layer constituting the outer surface of the vessel in the triple clad plate is 430 series, the entire vessel undergoes an induction reaction and is advantageous in terms of thermal efficiency and heat retention rate.

On the other hand, since the thickness of the upper layer of stainless, which is in direct contact with the mold in the rolling stage, is less than half of the thickness of the middle layer of aluminum, which is a relatively soft material located inside, when a load is applied in the rolling stage, the upper layer of stainless steel and the aluminum inside it As plastic deformation occurs simultaneously in the middle layer, molding to a surface having a concave-convex surface corresponding to the surface shape of the mold is performed smoothly.

The rolling roll device used in the rolling step of the next material clad plate consists of an upper roll and a lower roll. The lower roll functions as a work roll that directly contacts the material clad plate and transfers the load, and the upper relatively large roll It serves as a backup roll to support it in consideration of the case where the work roll is bent in the process of transmitting force through the work roll.

A mold support plate capable of reciprocating horizontal movement around the lower roll is located below the lower roll, and a disk-shaped mold surface having a concavo-convex surface is seated in a mold support frame formed in the center of the upper surface of the mold support plate in an upwardly exposed state. .

On the other hand, the rolling roll device can perform rolling while changing the rotational direction of the rolling roll in a state where workers are located on both sides of the device, in other words, the rolled material clad plate moved to the other side as a result of rolling. When the rolling roll is operated in the opposite direction to the previous one while replacing the new material cladding plate with a new material cladding plate, rolling is performed while the material cladding plate moves to the opposite operator side this time, so that the two workers repeat the same operation. As a result, the rolling operation can be performed quickly.

Through the above rolling process, the surface of the material clad plate is formed with hexagonal embossed portions that are continuous in all directions as concave-convex surfaces corresponding to molds, concave portions surrounded by each hexagon, and non-flat bottom surface portions formed with embossed dots protruding from the center of the concave portions. do. At this time, it should be understood that the 'hexagon embossed portion' is a hexagonal protruding edge having its own thickness, and the inside of the protruding edge becomes an empty space, and the bottom of the empty space constitutes the intaglio portion.

Through the polishing process, only the coating layer applied to the upper surface of the hexagonal embossed portion and the embossed dot is removed, and the coating layer of the concave portion remains as it is. Accordingly, on the bottom surface of the cooking vessel obtained by the method of the present invention, the surface layer of the embossed portion of stainless material, which is reliable in terms of corrosion resistance and hygiene, is locally exposed, and the intaglio layer coated below is located. - Not only does the stick property improve, but even if a metal scraper such as stainless is used, damage to the coating layer of the intaglio part is prevented, and furthermore, it is possible to use a 3M green scrubber or a 3M iron scrubber when washing the cooking vessel.

In the cooking vessel bottom surface processing method of the present invention, as a result of plastic deformation by one-pass cold rolling using a rolling roll device, a bottom surface portion in which embossed portions and intaglio portions are continuously repeated is generated, so that a conventional etching method is used. Compared to the concave-convex surface formation method of the floor surface through the method, the working process and working time are significantly reduced.

In addition, in the method of the present invention, rolling is performed by a simple operation that does not require skill in operating the rolling roll device, and the rolling roll device itself has a simple structure, so the equipment cost or space required for performing the rolling process is reduced. there is.

In addition, the present invention corresponds to an eco-friendly method in that it is not related to environmental problems caused by the conventional etching method using an acidic solution.

Figure 1 (a), (b) is a schematic perspective view and a longitudinal cross-sectional view showing the rolling process using the rolling roll device in the present invention
Figure 2 is a cross-sectional view showing the process of changing the material clad plate step by step in the method of the present invention (a) to (d),
(A) is a cross-sectional view of the material clad plate before rolling,
(B) is a cross-sectional view of the rolled material clad plate,
(C) is a cross-sectional view of the coating layer applied to the rolled material clad plate before polishing,
(D) is a cross-sectional view of the material clad plate from which the coating layer on the upper surface of the embossed portion has been removed through a polishing process.
Figure 3 (a) (b) is a photograph of a kitchen container processed by the method of one embodiment of the present invention,
(a) shows the entire container,
(b) is an enlarged portion.

The technical purpose of the present invention, the specific operational effects, including the characteristic process and configuration, will be more clearly explained to those skilled in the art to which the present invention belongs through the following detailed description with reference to the drawings for the embodiments of the present invention. It will be understood.

First, Figures 1 (A) and (B) are schematic perspective views and longitudinal cross-sectional views showing the rolling process using the rolling roll device in the present invention, and Figure 2 (A) to (D) are step-by-step material cladding of the method of the present invention A cross-sectional view showing the changing process of the plate. The entire cross-sectional view, and (D) is a cross-sectional view of the material clad plate from which the coating layer on the upper surface of the embossed portion has been removed through a polishing process.

First, a mold M having hexagonal rim intaglios continuous in all directions and intaglio dots formed in the inner center of each hexagonal rim on the surface of a flat disc is manufactured, and the upper roll as shown in (a) and (b) of FIG. 1 is formed. (2) and the lower roll (3) were fixed in the mold support frame (5) of the movable support plate (4) of the rolling roll device (1). At this time, the mold M fixed to the mold support frame 5 was seated on the mold support frame in a state where the concave-convex surface portion formed the same plane as the upper end of the mold support frame 5.

Next, as shown in (a) of FIG. 2, a material clad plate made of a triple clad plate to which a lower stainless layer 12 is below the center of the aluminum middle layer 11 and an upper stainless layer 13 is bonded to the top ( 10) was prepared. The total thickness of the material clad plate 10 was 2.3 mm, of which the thickness of the upper stainless layer 13 was 0.4 mm, the thickness of the middle layer of aluminum was 1.4 mm, and the lower layer of stainless steel 12 was 0.5 mm.

The material clad plate 10 was cut into a disc shape with a diameter slightly larger than that of the mold M, and placed on the mold M previously fixed to the mold support frame 5 as shown in FIG. 1 (A). . Then, as shown in (b) of FIG. 1, in a state where the movable support plate 4 is pushed in contact with the lower end of the lower roll 3 of the rolling roll device 1, the lower roll device 1 is operated to move the upper roll The contact surface between the mold M and the material clad plate 10 due to the load transmitted while the material clad plate 10 in contact with the lower roll 3 is rolled in by the rotation of the lower roll 2 and the lower roll 3 An embossed portion and a concave portion were created in the stainless upper layer 13 of the material clad plate 10 by inter-compression. At this time, the load applied from the rolling roll device 1 was about 120 tons. Reference numeral R in Fig. 1 denotes a rod-shaped rotary roller that movably supports the movable support plate 4.

The above rolling process is performed in the process where the mold M including the material clad plate 10 supplied from one side of the rolling roll device exits to the other side by the rotation of the lower roll 3 rotating in a pressure contact state. , the rolling process is completed when the material clad plate 10 leaves the lower roll 3.

2 (b) shows a cross section of the material clad plate 10 after the rolling process is completed. As shown, the upper stainless layer 13 of the material clad plate 10 is rolled as shown in FIG. 2 (a). The embossed portion (Sa) protruding compared to before and the concave portion (Sb) relatively depressed between the embossed portions form a continuous non-flat surface. The embossed portion Sa includes an embossed dot Saa protruding from the center of the concave portion Sb surrounded by hexagonal protrusions that are continuous in all directions.

As described above, during the rolling process, the stainless upper layer 13, which was flat before rolling, is plastically deformed into a non-flat surface in which the embossed parts (Sa) and the concave parts (Sb) having a difference in surface height are alternately continuous. It was found that the relatively soft aluminum intermediate layer 11 below it was also deformed along with the deformation of the upper stainless layer 13.

Next, in order to impart non-stick characteristics to the cooking vessel, a coating liquid is sprayed on the surface of the upper stainless layer 13 of the material clad plate 10 on which the embossed and intaglio portions are formed, and the entire area as shown in (c) of FIG. A coating layer (cl) was formed over the surface. The composition of the coating layer is a conventional Teflon coating material containing fluorine resin as the main component, and a composition in which red pigment is added is used. did

Subsequently, polishing was performed on the surface of the coated material clad plate 10 using a rotary grinder. At this time, the polishing was limited to the upper surface of the embossed portions (Sa, Saa) of the upper stainless layer 13 to selectively remove the coating layer.

Figure 2 (d) is a cross-sectional view of the material clad plate in a state in which the coating layers of the embossed portions (Sa, Saa) have been removed by polishing, and the concave portions (Sb) other than the upper surface of the embossed portions have the coating layer (cl) intact. It exists.

On the other hand, (a) (b) of FIG. 3 is a photograph of a kitchen container processed by the method of an embodiment of the present invention, (a) shows the entire container, and (b) shows an enlarged portion of the bottom surface. It can be seen that the ratio occupied by the intaglio portion Sb in the area is relatively wider than that of the embossed portions Sa and Saa.

1. Rolling roll device 2. Upper roll
3. Lower roll 4. Movable support plate
5. Mold support frame M. Mold
10. Material clad plate 11. Aluminum intermediate layer
12. Stainless lower layer 13. Stainless upper layer
Sa. Embossed Saa. embossed dots
Sb. intaglio

Claims (6)

Preparing a disc-shaped mold in which hexagonal edge intaglios continuous in all directions and dot intaglios are formed in the center of each hexagon;
A triple clad plate in which the upper stainless layer and the lower stainless layer are joined using aluminum as an intermediate layer and the thickness of the aluminum intermediate layer is greater than the sum of the thicknesses of the upper and lower stainless layers is manufactured, and the disc-shaped material clad plate is cut to a size corresponding to the disc-shaped mold. preparing a;
Mounting the disc-shaped mold in a mold support frame provided on a movable supporting plate of a rolling roll device;
Preparing a disc-shaped mold in which hexagonal edge intaglios continuous in all directions and dot intaglios are formed in the center of each hexagon;
A triple clad plate in which the upper stainless layer and the lower stainless layer are joined using aluminum as an intermediate layer and the thickness of the aluminum intermediate layer is greater than the sum of the thicknesses of the upper and lower stainless layers is manufactured, and the disc-shaped material clad plate is cut to a size corresponding to the disc-shaped mold. preparing a;
Mounting the disc-shaped mold in a mold support frame provided on a movable supporting plate of a rolling roll device;
placing the disc-shaped material clad plate in an overlapping state with a disc-shaped mold mounted in the mold support frame;
Operating the rolling roll device in a state where one edge of the material clad plate placed in the mold is in contact with the lower roll of the rolling roll device so that rolling is performed by moving the movable support plate together with the pressure rotation of the lower roll;
Forming a non-stick coating layer on the surface of the material clad plate on which the embossed and intaglio portions are formed by rolling;
removing the coating layer applied to the upper surface of the embossed portion using a polishing machine;
drawing the material clad plate in such a way that the surface on which the embossed and intaglio portions are formed has an internal volume constituting the bottom surface of the container;
Method for processing the bottom surface of the cooking vessel, characterized in that comprising a. delete delete The method of claim 1, wherein the triple clad plate has a total thickness of 2.0 to 3.0 mm. The method of claim 1, wherein the embossed portion comprises hexagons continuous in all directions and embossed dots protruding from the center of the concave portion surrounded by each hexagon. The bottom of the cooking vessel according to claim 1, further comprising correcting warpage of the material clad plate generated in the rolling process by passing the material clad plate through a leveling device between the rolling step and the coating layer forming step. cotton processing method.

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