KR101967112B1 - Method for Manufacture of Frying Pan - Google Patents

Abstract

The present invention relates to a manufacturing method of a frying pan having excellent heat resistance, abrasion resistance, and corrosion resistance, which comprises: a thermal plate manufacturing step; a wall manufacturing step; a step of bonding a thermal plate and a wall; a heat-curing step; a first coating step; a second coating step; a handle coupling step; and a washing and drying step.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing a frying pan,

The present invention relates to a method for manufacturing a frying pan, and more particularly, to a method for manufacturing a frying pan having a heat resistant, abrasion-resistant, and corrosion-resistant property by integrally joining a wall to a heat plate joined by plural layers heated by a heating source.

In general, a frying pan is a wide pan that does not have a high level of oil to support or support various kinds of food. A frying pan has a long sack so that one can cook one side and lift the pan to get the other side up. The material of the frying pan is iron, aluminum, copper, etc. Recently, Teflon has been put on the market to prevent the food from sticking to the surface by processing fluorine resin on the aluminum surface.

A perfluorinated compound is used as a catalyst in the case of coating a fluorine resin, that is, Teflon, conventionally used in the manufacturing process of a frying pan. However, the perfluorinated compound generates toxic substances in the frying pan at temperatures of about 200 ° C or higher during preheating and heating, and acts as an environmental hormone, accumulating in the environment, and moving in water or air. Perfumed compounds are lipophilic chemicals that accumulate easily in the human body and are transmitted to infants through maternal breastfeeding infants, which affects thyroid hormones and cranial nerves, such as causing attention deficit or hyperactivity disorder in infants and young children.

As a prior art related to the present invention, Patent Document 1 discloses a method of manufacturing a frying pan, comprising: a body forming step of manufacturing a body portion of a frying pan; A stainless steel sheet manufacturing step of manufacturing first and second stainless steel sheets respectively coupled to inner and outer bottom surfaces of the body part; A heat treatment step of thermally treating the first stainless steel plate to form an oxide layer on the surface of the first stainless steel plate; A stainless steel sheet joining step for integrally joining the first and second stainless steel sheets to the inner and outer bottom surfaces of the body part; A coloring step of coloring the outer surface of the body portion to which the second stainless steel sheet is bonded after the step of bonding the stainless steel sheet; A primer applying step of applying a primer on the inner surface of the body portion to which the first stainless steel plate is coupled to form a primer layer and a Teflon coating step of forming a Teflon coating layer on the inner bottom surface of the body portion on which the primer layer is formed A method of manufacturing a functional frying pan is disclosed.

Korean Registered Patent No. 10-1867912 (published on June 18, 2018)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a heat- Which is harmless to the human body and which can be used in both a gas range, an electric range and an induction range.

(A) a bottom layer forming step of cold-rolling a circular stainless steel plate so as to form upper irregularities and lower irregularities at regular intervals radially from the center, and A step of forming a heat protection layer by cold rolling so as to form a bottom concavity and a convexity at a predetermined interval, a step of forming a circular aluminum plate between the bottom layer and the heat protection layer, pressing the heat protection layer and the bottom layer by a forging method, And a joining process for forming the first joining portion by electron beam welding of the coupled bottom layer, the heat conduction layer, and the heat protection layer rim A hot plate manufacturing step; (b) an inner wall molding process for cold-rolling the outer circumferential surface of the tubular ceramics so as to form a concavo-convex shape, a step of cold-rolling the stainless steel inner circumferential surface of the tubular stainless steel so as to form irregularities corresponding to the concavities and convexities of the inner wall material, A step of inserting the inner wall unevenness between the outer wall member and the inner wall member, and the second end of the inner wall member and the lower end of the inner wall member are respectively electron beam welded; (c) joining the heat plate to the wall by electron beam welding after inserting the lower portion of the wall on the outer periphery of the heat plate, and then joining the portion where the heat plate and the wall are coupled; (d) a thermal curing step of heating the bonded heat plate and the surface of the wall to a predetermined temperature for a certain period of time to strengthen the surface hardness; (e) a first coating step of coating titanium on the inner surfaces of the bonded heat plate and the wall at a predetermined temperature by physical vapor deposition (PVD); (f) a second coating step of coating a carbon nanotube on the first coated surface by a discharge plasma sintering; (g) a knob coupling step of fixing a bracket for joining the knob to one side of the outer circumferential surface of the wall by spot welding and then fastening the knob to the bracket; (h) cleaning and drying the frying pan to which the handle is attached by spraying water containing the washing solution at high pressure, rinsing it with water, and drying it with hot air.

Further, in the step (a) of the present invention, the method may further include a sandblasting process of forming compressed air on the surface of the thermal protection layer after sandblasting to form a concavo-convex surface.

Further, in the present invention, it is possible to further include a step of polishing the surface of the welded portion after joining by electron beam welding in the steps (a) to (c).

Further, in the present invention, in the step (f), a thermometer may be colored on the surface of the heat-coated second plate.

In the present invention, the step (b) may further include the step of coloring the ceramic paint on the outer circumferential surface of the wall by vacuum evaporation.

Further, in the present invention, in the step (g) of the present invention, the handle may include: a bracket having a fixing hole formed at the center of its front side and both side ends bent backward and fixedly coupled to the side of the frying pan; And a nut fixedly coupled to the through hole formed at the center of the holder, wherein the holder is screwed to the outer circumferential surface of the rotary connector, A bracket and a frying pan; a coupling member formed of a latch to be inserted between the bracket and the frying pan; a fixture having a thread formed on the outer circumferential surface thereof to be screwed with the engaging member and screwed to the nut at the front center thereof, And a connecting member, a front portion of which is integrally coupled to the rotary link, and having an inner diameter A first handle member having a small insertion hole formed therein and having a spring inserted therein and having a guide hole bent at a predetermined angle at an edge of the end thereof; and a second handle member inserted in the insertion space, having a smaller outer diameter from the front to the rear, And a second handle member having a hollow portion formed therein and a D-ring integrally coupled to the rotary shaft penetratingly connected to the center of the end portion, wherein an inner diameter of the rear of the insertion space portion of the first handle member is smaller than an outer diameter of the front portion of the second handle member And may include a handle formed to be smaller.

According to the present invention, it is possible to provide a frying pan excellent in durability, heat resistance, abrasion resistance, and corrosion resistance by forming a plurality of coating layers on a heat plate and a wall surface by integrally joining heat plates and walls respectively bonded to a plurality of layers, It is easy to clean because it does not press the residue, and it is harmless to the human body and can be used both in gas range, electric range and induction range, and the advantage of providing safer and convenient frying pan by improving the function of the frying pan have.

FIG. 1 is an exemplary view illustrating a frying pan manufacturing process according to an embodiment of the present invention.
FIG. 2 shows a process of manufacturing a hot plate in the process of manufacturing a frying pan according to the present invention.
FIG. 3 shows a manufacturing process of a wall in the process of manufacturing a frying pan according to the present invention.
FIG. 4 is an exploded perspective view showing the combination of the wall and the heat plate in the process of manufacturing the frying pan according to the present invention.
FIG. 5 illustrates a process of joining a heat plate and a wall in a frying pan manufacturing process according to the present invention.
6 is a view illustrating a process of coating a surface of a frying pan in a frying pan manufacturing process according to the present invention.
FIG. 7 is another embodiment showing a process of coating a surface of a frying pan in a frying pan manufacturing process according to the present invention.
FIG. 8 is an exploded perspective view showing a process of attaching a removable handle to a frying pan in a frying pan manufacturing process according to the present invention.
FIG. 9 is a cross-sectional view showing a folding type handle for a frying pan according to the present invention.

Hereinafter, a method of manufacturing a frying pan according to the present invention will be described in detail with reference to the accompanying drawings.

The frying pan of the present invention is manufactured by separately dividing a heat plate, a wall and a handle, and then integrally joining the same.

First, in FIG. 1, the manufacturing step S10 of the heating plate 100 is described. The heat plate 100 is a portion heated directly by heat generated from the heating source, and is divided into a bottom layer, a heat conduction layer, and a heat protection layer.

2A, the bottom layer 110 molding step S11 of the heating plate 100 is a circular stainless steel plate, and upper and lower concaves and convexes 111 and 112 are formed radially at regular intervals from the center. The bottom layer 110 is formed by cold rolling. The bottom unevenness 112 of the bottom layer 110 prevents the frying pan from slipping easily on the food cooking apparatus serving as the heating source. Further, the lower unevenness 112 is formed at a predetermined distance in the radial direction from the center so as not only to be placed on the burner head of the gas range but also to not slip. Also, do not slip easily on the top surface of the electric range or induction range. The protrusion of the upper protrusion 111 of the bottom layer 110 is formed at a position coinciding with the recess of the lower protrusion 112 or the protrusion of the upper protrusion 111 is formed at a position coinciding with the protrusion of the lower protrusion 112 .

The stainless steel made of the bottom layer 110 is preferably made of a ferritic STS430 steel or a 430J1L steel to which copper and niobium are added to the STS430 steel.

In the molding step S12 of the thermal protection layer 120, the lower concavities and convexities 121 are formed at regular intervals radially from the center of the circular ceramic plate material. At this time, the surface of the thermal protection layer 120 is flat without any irregularities formed. The heat protection layer 120 is formed by cold rolling. The ceramics of the thermal protection layer 120 may be a single material such as silicon carbide, silicon nitride, boron nitride, zirconia, alumina, tungsten carbide, or the like. Or a composite material such as Al2O3-TiC, Si3N4-TiC, Si3N4-TiN, TiC-TiN, SiC-SiC fiber or the like is applied and has high strength, hardness, abrasion resistance, corrosion resistance and heat resistance.

2B, the forming process S13 of the heat conduction layer 130 is a circular aluminum plate, and an aluminum plate is placed between the bottom layer 110 having irregularities on the top and bottom surfaces and the heat protection layer 120 having irregularities on the bottom surface. 2C, a pressing force is applied by a constant force on the thermal protection layer 120 and under the bottom layer 1 so that the aluminum plate is pressed against the recesses of the upper unevenness 111 of the bottom layer 110 and the lower portion of the thermal protection layer 120 And are filled with impregnation into the concave and convex portions 121, respectively. At this time, the recesses of the upper unevenness 111 of the bottom layer 110 and the recesses of the lower unevenness 121 of the thermal protection layer 120 are narrowly formed, and after the aluminum plate is filled into the recesses, So that the thermal protection layer 120 is not separated from the heat conduction layer 130.

2D, after the thermally conductive layer 130 is bonded to the heat plate 100 between the bottom layer 110 and the thermal protection layer 120, the rim of the heat plate 100 is joined by electron beam welding to form the first bonding portion 140 (Step S14). Electron beam welding is performed by melting the high-speed accelerated electrons, that is, the electron beams, on the edge joints of the bottom layer 110, the thermal protection layer 120, and the heat conduction layer 130 by using the impact heat. Next, in FIG. 2E, the surface of the first joint 140 joined by electron beam welding is polished using a polishing apparatus equipped with an abrasive (S15).

2F, compressed air is sprayed onto the surface of the thermal protection layer 120, followed by a sandblasting process (S16) in which a fine uneven surface 122 is formed on the surface.

Next, in Fig. 3, the wall 200 is manufactured (S20). The wall 200 is divided into an inner wall material 210 and an outer wall material 220 to form a space for cooking inside the upper part of the heat plate 100 of the frying pan.

3A, in the forming process S21 of the inner wall material 210 of the wall 200, the inner wall material 210 is formed with concavities and convexities 211 perpendicular to the outer surface of the cylindrical ceramic. The inner wall member 210 is formed by cold rolling. The inner wall member 210 has a large upper inner diameter and a narrow inner diameter, and a curved surface is formed at a certain rate from the upper portion to the lower portion. The ceramics of the inner wall material 210 may be a single material such as silicon carbide, silicon nitride, boron nitride, zirconia, alumina, tungsten carbide, or the like. Composite material such as Al2O3-TiC, Si3N4-TiC, Si3N4-TiN, TiC-TiN, SiC-SiC fiber etc. is applied and has high strength, hardness, abrasion resistance, corrosion resistance and heat resistance. Further, the surface of the inner wall member 210 is subjected to a sandblasting process in which compressed air is sprayed by a sand blast method to form a fine uneven surface 212 on the surface.

In the forming process (S22) of the outer wall member 220, the outer wall member 220 is provided with concavities and convexities 221 perpendicular to the cylindrical inner circumferential surface of the stainless steel. The concave and convex portions 221 of the outer wall member 220 are formed by cold rolling so that the concave and convex portions 221 corresponding to the concave and convex portions 211 of the inner wall material 210 are formed. The stainless steel made of the outer wall material 220 is preferably made of a ferrite-based STS430 steel material or a 430J1L steel material obtained by adding copper (Cu) and niobium (Nb) to STS430 steel.

The forming process S23 through the combination of the inner wall member 210 and the outer wall member 220 is performed by inserting the protrusion 221 of the concave and convex portion 221 formed on the inner circumferential surface of the outer wall member 220 into the recessed portion 211 of the concave / And recesses 221 formed on the inner circumferential surface of the outer wall member 220 are inserted into the protrusions 211 formed on the outer circumferential surface of the inner wall material 210. Therefore, when the inner wall member 210 is inserted into the outer wall member 220, the inner wall member 210 is inserted and coupled between the concave and convex portions 221 of the outer wall member 220. Then, the outer joint member 220 and the inner wall member 210 are joined together by electron beam welding to form an upper end portion and a lower end portion of the inner joint member 210 to form a second joint portion 230 (S24). In the electron beam welding, the electron beam, which is accelerated at a high speed in a high vacuum, is melted and welded on the outer joint 220 and the edge joint at the upper and lower ends of the inner wall 210 using the impact heat. Next, in FIG. 3C, the surface of the second joint 230 joined by electron beam welding is polished using a polishing apparatus equipped with an abrasive (S25). 3D, the ceramic paint 240 is colored on the outer circumferential surface of the wall 200 where the inner wall member 210 and the outer wall member 220 are joined by the second joint 230, that is, the outer surface of the outer wall member 220 (S26). The coloring of the ceramic paint is colored by vacuum evaporation. When the ceramic paint 240 is colored, various colors of paints can be applied. The vacuum deposition method is a method in which a metal or a non-metal is heated and deposited in vacuum, and then coagulated on the surface of the outer wall material 220 to form a film. Further, a sputtering plating may be applied which utilizes the action that atoms or small crystals of the negative electrode material evaporate due to positive ions colliding with the negative electrode due to glow discharge on the outer circumferential surface of the outer wall member 220, and a part thereof adheres to the wall of the discharge tube.

4 and 5, the heat plate 100 and the wall 200 manufactured through the molding process S10 of the heat plate 100 and the molding process S20 of the wall 200 are combined and integrated S30). 5A, after the lower portion of the wall 200 is inserted into the outer periphery of the manufactured heat plate 100, a portion where the heat plate 100 and the wall 200 are coupled is welded to the heat plate 100 and the wall 200 ) Are joined together by electron beam welding to form a third joint part 250 (S40). In FIG. 5B, the portion bonded by electron beam welding is polished by using a polishing apparatus equipped with an abrasive. 5C, the surface of the heating plate 100 bonded with the frying pan 2 and the surface of the wall 200 are heated to a predetermined temperature for a predetermined period of time to enhance the surface hardness (S50).

Next, in FIG. 6, the coating process is performed on the inner surface of the heat plate 100 and the wall 200 integrally bonded. 6A, the first coating layer 310 is coated with titanium on the bottom surface of the heat plate 100 and the inner surface of the wall body 200 at a constant temperature by physical vapor deposition (PVD) (S60). That is, the first coating layer 310 is used to increase the hardness of the surface according to the physical vapor deposition method, and coating is performed at about 500 degrees or less. In the physical vapor deposition method, the titanium material, which is a coating material, is converted into a gaseous state by the physical evaporation principle, and the gaseous atmosphere between the evaporation source and the thermal protection layer 120 of the heat plate 100 and the surface of the inner wall material 210 of the wall body 200 Coating is achieved by condensing the thin film through vapor transfer. At this time, the first coating layer 310 may be formed by thermal evaporation, which vaporizes titanium by thermal shock, or titanium (Ti), which is caused by the impact of high energy neutral particles generated by inert gas (Ar) A sputtering process or an arc ion plating process for vaporizing the source gas is applied.

Further, the second coating layer 320 is coated on the first coated surface. In FIG. 6B, the second coating layer 320 is coated with a discharge plasma sintered carbon nanotube on the first coating layer 310. At this time, the second coating layer 320 generates an arc discharge between the graphite and the catalyst metal compound electrode to vaporize the carbon and the catalyst metal, control the rate of cooling the vaporized carbon and the catalyst metal, And the carbon nanotubes having excellent crystallinity and purity are coated by controlling the holding time at the recrystallization temperature to be somewhat longer.

6C, a thermometer 330 for displaying the temperature of the surface of the heat plate 100 may be colored on the second coating layer 310. In this case, The outer surface of the outer wall 220 of the wall 200 may be colored with a ceramic coating material by a vacuum evaporation method.

Next, in Fig. 7, another embodiment of the coating process is shown on the inner surface of the integrally bonded heat plate 100 and the wall body 200. As shown in Fig. 7A, the first coating layer 310 is coated with titanium on the bottom surface of the heat plate 100 and the inner surface of the wall body 200 at a predetermined temperature by physical vapor deposition (PVD). 7B, the patterned coating layer 340 is coated on the first coating layer 310 at regular intervals in the radial direction from the center of the heat plate 100. And the patterned coating layer 340 becomes a ceramic coating layer of yin-yang angle. 7C, the second coating layer 320 is formed by a discharge plasma sintering process of carbon nanotubes on the patterned coating layer 340 and the first coating layer 310 coated with the yang and angles. 7D, a thermometer 330 for displaying the temperature of the surface of the heat plate 100 may be colored on the second coating layer 310. [ The outer surface of the outer wall 220 of the wall 200 may be colored with a ceramic coating material by a vacuum evaporation method.

Next, in Fig. 8 and Fig. 9, a step of engaging the handle to the frying pan 2 is performed (S90). The bracket 3 for fixing the handle 1 to the one side of the outer circumferential surface of the wall 200 is fixed by spot welding and then the handle 1 is fastened to the bracket 3. [ The handle 1 has a structure in which a fixing hole 4 is formed at the center of the handle 1 and both side ends of the bracket 3 are bent back and fixed to the side of the frying pan 2, And a holder 16 which is inserted into the bracket 3 and screwed into the outer circumferential surface of the rotary connector 20 inside the operating hole 17 formed at the other side and the nut 15 And a latch 12 protruding forward from an upper end of the body 11 and bent downward at an angle to be inserted between the bracket 3 and the frying pan 2, And a fixing member 21 is formed on the outer circumferential surface of which a screw thread is screwed with the coupling member 10 and screwed to the nut 15 at the front center thereof. (20) integrally coupled to the rotary connector (20) A first handle member 30 having a guide hole 31 formed at an edge of the end portion thereof and having an insertion space portion 32 having a smaller inner diameter from the front to the rear and having a spring 33 inserted therein, And a D-ring (42) integrally coupled to the rotary shaft (42) inserted into the insertion space (32) and having a smaller outer diameter from the front to the rear and having a hollow portion (41) Wherein the inner diameter of the rear portion of the insertion space portion 32 of the first pull member 30 is smaller than the outer diameter of the front portion of the second pull member 40, .

The handle 1 is formed with a bracket 3 having a fixing hole formed on the side of the frying pan and the handle 1 can be easily engaged or disengaged by using the engaging member 10 having the latch 12 protruding from the bracket 3 So that the handle 1 can be pulled out or pushed out.

The knob 1 inserts the latch 12 of the engaging member 10 into the bracket 3 formed on the frying pan 2 side in order to engage the frying pan 2 in Fig. At this time, the bracket 3 is inserted into the engaging hole 14, and the latch 12 is inserted between the surface of the frying pan 2 and the inside surface of the bracket 3. 9B, the first pull member 30 to which the rotating connector 20 is connected is rotated in a predetermined direction, for example, clockwise. When the first handle member 30 is rotated, the rotary connector 20 is rotated and the fastener 21 fixed to the center of the rotary connector 20 is rotated to advance along the threaded nut 15 . The fastener (21) is inserted through the fixing hole (4) of the bracket (3) inserted into the fitting hole (14) while being protruded. The latch 21 is brought into contact with the inner surface of the latch 12 through the fixing hole 4 while rotating the first pull member 30 so that the first pull member 30 can no longer be rotated. Further, the end of the fastener 21 is formed of the same inclined surface as the inclination angle of the engaging hole 14, so that the end of the fastener 21 is formed to be positioned at the position coinciding with the side surface of the engaging hole 14 after passing through the fixing hole 4 will be good.

After the latch 12 of the engaging member 10 is engaged with the bracket 3 formed on the side of the frying pan 2, the first engaging member 30 is rotated so that the fastener 21 is fastened to the fastener 4, the bracket 3 is firmly fixed to the handle by the engagement hole 14 and the support of the latch 12 and the fixation of the latch 21 at the upper part.

Further, in order to separate the engaging member 10 coupled to the bracket 3, the first pull member 30 is rotated in a predetermined direction, for example, counterclockwise. When the first pull member 30 is rotated, the rotary link 20 is rotated and the fixture 21 integrally coupled to the rotary link 20 is rotated and retracted from the fixing hole 4 of the bracket 3 do. The first handle member 30 is continuously rotated so that the engaging member 10 is pulled out of the bracket 3 inserted into the engaging hole 14 when the fastener 21 is completely retracted from the fastening hole 4 of the bracket 3 It becomes possible to separate it.

Next, in Fig. 9C, the second pull member 40 inserted into the first pull member 30 is pulled backward to pull out the pull. At this time, the D-ring 43 fixedly coupled to the rotary shaft 42 of the second pull member 40 is held and pulled. When the D-ring 43 is pulled out, the second pull member 40 is pulled out from the inside of the first pull member 30. The second pull member 40 stops at the end of the first pull member 30 while it is continuously pulled out from the first pull member 30 and is no longer pulled out. This is because the inner diameter behind the inner circumferential surface of the first pull member 30 becomes smaller than the outer diameter before the outer circumferential surface of the second pull member 40.

The second knob member 40 can be pulled out from the first knob member 30 in a state where the joining member 10 is engaged with the bracket 3 and fixed and then the food can be cooked using the frying pan 2 will be.

Next, washing and drying of the frying pan 2 to which the handle 1 is attached is performed (SlOO). The frying pan (2) to which the handle (1) is coupled is cleaned by spraying water containing the cleaning liquid at high pressure, rinsed with water, and then dried with hot air. Thereafter, the frying pan 2, which has been dried, may be further packed with a packaging material.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who has it will know it easily.

1: handle 2: frying pan 3: bracket 4: fixing hole 10: engaging member 11: body 12: latch 13: through hole 14: engaging hole 15: nut 16: holder 17: The rotary link 21 includes a handle 30, a first handle member 31, a guide hole 32, an insertion space 33, a spring 40, a second handle member 41, a hollow portion 42,
The present invention relates to a method of manufacturing a semiconductor device and a method of manufacturing the same, and more particularly, to a semiconductor device and a method of manufacturing the same. 220: outer wall material 221: concave and convex 230: second joint 240: ceramic paint 250: third joint 310: first coating layer 320: second coating layer 330: thermometer 340:

Claims (6)

(a) a bottom layer forming step of cold-rolling a circular stainless steel plate so as to form upper and lower concavities and convexities with a predetermined spacing in the radial direction from the center, and a step of forming a circular concave- A step of forming a heat protection layer by cold rolling; a step of placing a circular aluminum plate between the bottom layer and the heat protection layer, pressing the heat protection layer and the bottom layer by a forging method, And a joining step of forming a first joint by electron beam welding the rim of the coupled bottom layer, the heat conductive layer, and the thermal protection layer, respectively;
(b) an inner wall molding process for cold-rolling the outer circumferential surface of the tubular ceramics so as to form a concavo-convex shape, a step of cold-rolling the stainless steel inner circumferential surface of the tubular stainless steel so as to form irregularities corresponding to the concavities and convexities of the inner wall material, A step of inserting the inner wall unevenness between the outer wall member and the inner wall member, and the second end of the inner wall member and the lower end of the inner wall member are respectively electron beam welded;
(c) joining the heat plate to the wall by electron beam welding after inserting the lower portion of the wall on the outer periphery of the heat plate, and then joining the portion where the heat plate and the wall are coupled;
(d) a thermal curing step of heating the bonded heat plate and the surface of the wall to a predetermined temperature for a certain period of time to strengthen the surface hardness;
(e) a first coating step of coating titanium on the inner surfaces of the bonded heat plate and the wall at a predetermined temperature by physical vapor deposition (PVD);
(f) a second coating step of coating a carbon nanotube on the first coated surface by a discharge plasma sintering;
(g) a knob coupling step of fixing a bracket for joining the knob to one side of the outer circumferential surface of the wall by spot welding and then fastening the knob to the bracket;
(h) a washing and drying step of spraying high-pressure water containing a washing solution onto the frying pan to which the handle is coupled, washing it with water, and drying it with hot air,
In the step (g), the handle includes: a bracket having a fixing hole formed at the center of the front side thereof and bent at both side ends thereof and fixed to the side surface of the frying pan; and a bracket A body having a nut fixedly coupled to a through hole formed through the center of the holder, the holder being screwed with the outer circumferential surface of the rotary connector, an upper part protruding forward from the upper part of the body and bent downward at a predetermined angle to be inserted between the bracket and the frying pan A rotatable connection body having a thread formed on an outer circumferential surface of the coupling member and threaded to be screwed on the outer circumferential surface of the coupling member, And an inner diameter is reduced toward the inside from the front to the rear, A first handle member having a guide hole formed with a spring inserted therein and having a guide hole bent at a predetermined angle at an edge of the end portion; a first handle member inserted into the insertion space, having a smaller outer diameter from the front to the rear, And a second handle member having a D ring integrally coupled with the rotary shaft penetratingly connected to the center of the second handle member, wherein an inner diameter of the rear of the insertion space portion of the first handle member is smaller than an outer diameter of the front of the second handle member Containing frying pan.
The method for manufacturing a frying pans according to claim 1, further comprising a sandblasting step of spraying compressed air on the surface of the thermal protection layer after sandblasting to form irregularities on the surface thereof in the step (a).
The method of manufacturing a frying pan according to claim 1, further comprising the step of polishing the surface of the welded portion after joining by electron beam welding in the steps (a) to (c).
The method of manufacturing a frying pan according to claim 1, wherein, in the step (f), a thermometer is colored on the surface of the second plate coated plate.
The method of claim 1, further comprising, in the step (b), coloring the ceramic paint on the outer surface of the wall by vacuum evaporation.
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