KR19990070315A - Oven for Induction Heating Cookware and Manufacturing Method Thereof - Google Patents

Abstract

The present invention relates to an oven of an induction heating cooker and a method of manufacturing the same, wherein a nickel layer is formed on an aluminum material drawn in the shape of an oven, and a zinc layer is formed to increase adhesion between the aluminum material and the nickel layer. By plating nickel on the material to improve the bonding strength, the thermal conductivity and heating performance can be improved to improve the performance and reliability of the product. Also, the improvement of the thermal conductivity and heating performance can prevent material loss caused by defective products and recycle. It can work.

Description

Oven for Induction Heating Cookware and Manufacturing Method Thereof

The present invention relates to an oven of an induction heating cookware and a method of manufacturing the same, and in particular, the heat conduction performance and the heating performance can be improved by triple-treating the zinc layer, the electroless nickel layer, and the electric nickel layer in the address material of the oven. It relates to an oven of an induction heating cooker and a method of manufacturing the same.

In the manufacture of ovens for induction heating cookers, research on joining dissimilar materials such as mechanical methods or chemical methods has been actively conducted to eliminate resonance phenomena caused by weak electric fields between dissimilar materials.

As shown in FIG. 1, the oven of a general induction heating cooker includes a stainless steel material 10 forming the outside of the oven of the induction heating cooker and an aluminum material 12 forming the inside of the oven of the induction heating cooker. Consists of

That is, the stainless material 10 and the aluminum material 12 are bonded to form a clad.

When power is applied to the induction heating cooker, an electric field is generated in an induction coil (not shown), and the electric field cooks food in the oven of the induction heating cookware through the magnetic material 10.

As shown in Figure 2, a method of manufacturing an oven of a general induction heating cooker is as follows.

After cutting the stainless material 10 and the aluminum material 12 to the required size, the stainless material 10 and the aluminum material 12 are bonded.

In the state where the stainless material 10 and the aluminum material 12 are bonded together, the heating heater 16 in the hot furnace 14 is operated. The heating heater 16 is heated for 5 to 10 minutes at, for example, 380 ℃ to 440 ℃.

In the state where the stainless material 10 and the aluminum material 12 are heated, the stainless material 10 and the aluminum material 12 are hot pressed using the roller 18. The load of the roller 18 used for hot pressing the stainless material 10 and the aluminum material 12 is 150 ton, for example.

After cooling the hot pressed clad, the shape of the oven is drawn.

Examples of the manufacturing method is an example of a manufacturing process by the pressing method and there is a manufacturing method for joining dissimilar materials by a method such as rolling, diffusion, explosion.

However, a method of manufacturing an oven of a general induction heating cooker has a weak bonding force between the stainless material 10 and the aluminum material 12, causing resonance due to an electric field, and deteriorating thermal conductivity and heating efficiency due to the resonance. There was this.

In addition, as the thermal conductivity and the heating efficiency are lowered, there is a problem that the cooking time is long and the power consumption increases.

The present invention has been made to solve the above problems, an object of the present invention is to provide an oven of an induction heating cooker that can improve the thermal conductivity and heating performance by improving the bonding strength by plating nickel on the aluminum material of the oven. have.

It is another object of the present invention to provide a method for manufacturing an oven of an induction heating cookware which can improve thermal conductivity and heating performance by triple surface treatment of a zinc coating step, an electroless nickel plating step and an electric nickel plating step. .

1 is a cross-sectional view of an oven of a general induction heating cooker,

2 is a schematic view showing an apparatus for manufacturing an oven of a general induction heating cooker,

3 is a cross-sectional view and an enlarged cross-sectional view of the oven of the induction heating cooker of the present invention;

Figure 4a, 4b is an enlarged cross-sectional view showing a schematic view and a manufacturing result of the manufacturing apparatus for forming a zinc film of the present invention,

5A and 5B are schematic cross-sectional views of a manufacturing apparatus for forming an electroless nickel plated layer of the present invention and an enlarged cross-sectional view showing a result thereof;

Figure 6a, 6b is an enlarged cross-sectional view showing a schematic view of the manufacturing apparatus for forming an electro-nickel plated layer of the present invention and the result of the manufacture;

7 is a flowchart of a manufacturing method for forming a zinc film of the present invention;

8 is a flowchart of a manufacturing method for forming an electroless nickel plating layer of the present invention;

9 is a flow chart of a manufacturing method for forming an electric nickel plated layer of the present invention.

Explanation of symbols for main parts of the drawings

100: aluminum material 102: zinc film

104, 106: nickel plated layer 108: zinc substituted coating bath

110: zinc substituted solution 112: rack

114: rack bar 116: electroless nickel plating tank

118: nickel plating solution 120: electric nickel plating bath

124: nickel anode plate 126: power

In order to achieve the above object, the oven of the induction heating cooker according to the present invention is characterized in that a nickel layer is formed on an aluminum material drawn in the shape of an oven.

In order to achieve the above object, the oven of the induction heating cooker according to the present invention is characterized in that a zinc layer is formed between the aluminum material and the nickel layer to increase adhesion.

A first aspect of the method for manufacturing an oven of an induction heating cooker according to the present invention for achieving the above object is to form a zinc layer on the surface of the aluminum material by substitution reaction of zinc in the aluminum material drawn in the shape of the oven. The zinc layer forming step and the nickel layer forming step of forming a nickel layer by plating the nickel by the chemical reaction of the nickel plating solution on the resultant is performed.

According to a second aspect of the method of manufacturing an oven of an induction heating cooker according to the present invention for achieving the above object, a nickel layer forming step of forming a nickel layer by a chemical reaction with a nickel plating solution may include a zinc layer forming step. An electroless nickel layer forming step of forming an electroless nickel layer by plating nickel in an electroless state by a reduction reaction of the nickel plating solution on the resultant, and a nickel plating solution on the resultant of the electroless nickel layer forming step. An electronickel layer forming step of forming an electronickel layer by plating nickel by the electrochemical reaction of.

According to a third aspect of the method for manufacturing an oven of an induction heating cooker according to the present invention for achieving the above object, an aluminum material drawn in an oven shape to form a zinc layer is deposited on a caustic soda solution to An etching step of etching the surface unevenly, a first cleaning step of removing the caustic soda component by spraying a cleaning solution from the resultant of the etching step, and a result of performing the first cleaning step; Nitric acid treatment to deposit the hydrofluoric acid solution to activate the surface of the product subjected to the first cleaning step, nitric acid and hydrofluoric acid treatment to carry out hydrofluoric acid treatment, and nitric acid solution remaining in the product of the nitric acid and hydrofluoric acid treatment step; A second rinsing step to remove the hydrofluoric acid solution, and a zinc phosphate solution as a reaction accelerator for the resultant of the second rinsing step. The first zinc layer forming step of depositing a zinc film to form a zinc coating, the third washing step of washing to remove the zinc phosphate solution in the result of the first zinc layer forming step, and the third washing step is performed An acidic washing step of depositing a nitric acid solution on the resultant product and washing it with an acidic solution, and a secondary zinc layer forming step of forming a zinc film by depositing a zinc phosphate solution, which is a reaction promoter, on the resultant product of the acidic washing step.

A fourth aspect of the manufacturing method of the oven of the induction heating cookware according to the present invention for achieving the above object is, the surface of the zinc layer is formed by the cathodic electrolytic method by installing an iron plate to form a nickel plated layer by electroless An electrolytic degreasing step of conducting electrolytic degreasing to activate the oxide, a first cleaning step of cleaning contaminants from the result of the electrolytic degreasing step, and a result of performing the first cleaning step using an acid solution using hydrochloric acid solution Nickel by using nickel sulfate in the acid treatment step of acid treatment to remove, the second washing step of washing to remove hydrochloric acid solution in the result of the acid treatment step, and the result of the second washing step A third step of cleaning to remove the nickel sulfate solution from the nickel layer forming step of performing plating and the result of the nickel layer forming step being performed; It consists of a cleaning step.

A fifth characteristic of the method for manufacturing an oven of an induction heating cookware according to the present invention for achieving the above object is to install a nickel plate on the positive electrode plate to instantaneously flow a current to form a nickel layer of a thin film, nickel chloride solution Nickel strip step of proceeding the nickel strip to form a nickel layer of the thin film using a hydrochloric acid solution is further provided.

A sixth aspect of the method for manufacturing an oven of an induction heating cookware according to the present invention for achieving the above object is to activate a surface on which a nickel layer is formed by depositing a caustic soda solution to form a nickel layer by electricity. An electrolytic degreasing step for conducting electrolytic degreasing, a first cleaning step for cleaning to remove contaminants from the resultant of the electrolytic degreasing step, and a surface of the first filtration step by depositing nitric acid solution to activate the surface A neutralization step of neutralization treatment, a second washing step of removing the nitric acid solution from the resultant of the neutralization step, and a nickel sulfate solution and a nickel hydrochloride solution The primary nickel layer forming step of forming a primary nickel layer by dipping the hydrochloric acid solution and the primary nickel layer forming step is performed on the resultant The nickel sulfate solution, the nickel hydrochloric acid solution, and the nickel nickel sulfate solution, the nickel chloride solution, the hydrochloric acid solution and the brightening agent are deposited to form a secondary nickel layer, and the secondary nickel layer forming step is performed. And a third washing step of washing to remove the hydrochloric acid solution, and a drying step of drying the resultant in which the third washing step is performed by hot air drying.

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

3 is an enlarged cross-sectional view of an oven of nickel plated induction heating cookware.

The inside of the oven is formed of an aluminum material 100, the nickel plating formed by the triple surface treatment of the zinc coating 102, the electroless nickel plating layer 104 and the electric nickel plating layer 106 at the outer lower end of the oven. It consists of wealth.

4A and 4B are schematic views showing a manufacturing apparatus for forming a zinc coating 102 on the aluminum material 100 and a result of the manufacturing thereof.

As shown in FIG. 4A, the manufacturing apparatus for forming the zinc coating 102 may not directly plate nickel on the aluminum material 100, which is a non-ferrous metal, so that the zinc coating may be applied to the aluminum material 100 to provide adhesion. Zinc-substituted coating tank 108 for forming the 102, the zinc-substituted coating tank 108 in the zinc-substituted coating tank 108 to cause a substitution reaction, and is installed on the zinc-substituted coating tank 108 A rack 112 fixing the aluminum material 100 and a rack bar 114 supporting the rack 112 are provided.

4B is an enlarged cross-sectional view of a result of forming a zinc coating 102 on an aluminum material 100 that is an address material of the oven.

5A and 5B are electroless nickel for nickel plating on the zinc film 102 having excellent adhesion using the nickel plating solution 118 electrolessly on the aluminum material 100 on which the zinc film 102 is formed. It is a schematic diagram which shows a plating manufacturing apparatus and its manufacturing result.

As shown in FIG. 5A, the electroless nickel plating apparatus includes an electroless nickel plating tank 116 for plating nickel having excellent conductivity in a state in which a zinc coating 102 having excellent adhesion to the aluminum material 100 is formed. ), The nickel plating aqueous solution 118 causing a reduction reaction in the electroless nickel plating tank 116, and an aluminum material 100 having the zinc coating 102 installed on the electroless nickel plating tank 116. ) And a rack bar 114 for supporting the rack 112 is provided.

5B is an enlarged cross-sectional view of a nickel plating layer 104 formed by electroless nickel plating on the upper end of the zinc coating 102 formed on the aluminum material 100, which is an address material of the oven.

6A and 6B are schematic views showing an apparatus for manufacturing an electroplating nickel plate and a result of manufacturing the electroplating nickel plate for conducting nickel plating on the surface of the electroless nickel plated layer 104 to improve heat conduction performance and heating performance.

As shown in FIG. 6A, the electro-nickel plating apparatus includes a zinc film 102 having excellent adhesion to the aluminum material 100 and an electroless nickel plating layer 104 plated with nickel having excellent conductivity. And an nickel plating bath 120 for conducting nickel plating by electricity to improve heating performance, an nickel plating solution 118 for causing an electrochemical reaction in the nickel plating bath 120, and the nickel In the plating solution 118, a nickel metal 124 to which a power source 126 is connected, and an upper end of the electric nickel plating bath 120 are installed and plated with the zinc coating 102 and the electroless nickel plating layer 104. A rack 112 for fixing the aluminum 100 material is provided, and a rack bar 114 for supporting the rack 112 is provided.

FIG. 6B is an enlarged cross-sectional view of an electronickel plating layer 106 formed by performing nickel plating on an aluminum material 100 plated with a zinc film 102 and an electroless nickel plating layer 104 using electricity.

Hereinafter, a method of manufacturing an oven of an induction heating cooker according to an embodiment of the present invention configured as described above will be described in detail.

It is assumed that the aluminum material 100, which is the address material of the oven of the induction heating cooker, is already drawn in the form of an oven.

In addition, before surface treatment of the aluminum material 100, the inorganic contaminants, organic contaminants, and other contaminants in the aluminum material 100 may be cleaned by using an organic solvent or an alkali water-soluble detergent using a spray method and an ultrasonic method. Suppose you did.

As said organic solvent, carbon tetrachloride, trichloroethylene, etc. are used, for example.

Since the aluminum material 100 constituting the oven of the induction heating cooker is a non-ferrous metal and cannot directly plate nickel on the aluminum material 100, the aluminum material 100 is applied to the rack bar 114 to give an adhesive force. It is fixed to the zinc replacement solution 110 is filled in the zinc replacement film tank 108 is filled.

As shown in FIG. 7, the process of forming zinc film 102 by substituting zinc in the aluminum material 100 is as follows. Hereinafter, S means step.

In step S1, 5% to 10% of caustic soda solution is deposited at room temperature for 3 to 5 minutes to etch the surface of the aluminum material 100 unevenly.

In step S2, the resultant of step S1 is washed to remove the caustic soda solution.

In step S3, 10% nitric acid solution and 15% hydrofluoric acid solution were used to deposit 15 seconds to 60 seconds at room temperature, followed by nitric acid treatment and hydrofluoric acid treatment to activate the resultant product of step S2.

In step S4, the resultant of step S3 is washed to remove the nitric acid solution and hydrofluoric acid solution.

In step S5, 50% of zinc phosphate solution as a reaction accelerator is used to deposit for 15 seconds to 60 seconds at room temperature to form a primary zinc film 102 on the result of the step S4.

The zinc-substituted solution 110 and the aluminum 100 filled in the zinc-substituted coating tank 108 cause a substitution reaction.

By the substitution reaction, zinc ions form a film on the result of the step S4. Since the zinc ion is an amphoteric element like the aluminum 100, the zinc ion has good affinity and excellent adhesion.

In step S6, the resultant of step S5 is washed to remove the zinc phosphate solution.

In step S7, 40% nitric acid solution was used to deposit 15 seconds to 30 seconds at room temperature, followed by washing with acidic solution to activate the resultant of step S6.

In step S8, using a 50% zinc phosphate solution as a reaction promoter is deposited within 15 seconds to 60 seconds at room temperature to form a secondary zinc film 102 in the result of the step S7.

The aluminum material 100 coated with zinc ions to plate nickel having excellent conductivity in a state where a zinc film 102 having excellent adhesion is formed on the aluminum material 100 constituting the oven of the induction heating cooker. To the electroless nickel plating bath 116 filled with the nickel plating solution 118.

As shown in FIG. 8, the process of performing electroless nickel plating on the aluminum material 100 on which the zinc film 102 is formed by substituting the zinc is as follows.

In step S1, an iron plate is installed on the positive electrode plate to apply an electric current, and electrolytic degreasing is performed to activate the surface at 50 ° C. to 60 ° C. for 1 minute to 3 minutes by the cathode electrolytic method.

For example, FC4260 is used as the electrolytic degreasing agent, and the current of the positive electrode plate is, for example, 5 A / dm.

In step S2, the resultant of step S1 is washed to remove the electrolytic degreasing agent.

In step S3, 10% hydrochloric acid solution is used to acidify to activate the result of performing step S2 within 1 to 3 minutes at room temperature.

In step S4, the resultant of step S3 is washed to remove the hydrochloric acid solution.

In step S5, a nickel plate was installed on the positive electrode plate using 200 g / l nickel chloride solution and 100 ml / l hydrochloric acid solution, and plated with nickel at 0.1 nm to 0.5 nm for 1 to 3 minutes by applying a current at room temperature. In order to perform the nickel strip on the result of performing step S4.

The filter mesh used for the nickel strip is 5 m The distance of the positive electrode plate is, for example, within 10 cm to 15 cm, and the current flowing through the positive plate is, for example, 5 A / dm.

Nickel plating is carried out on the result of performing step S5 at 1 nm to 5 nm for at least 12 hours at 90 ° C. to 92 ° C. using nickel sulfate solution 24 g / l in step S6.

The zinc material coated with the zinc material in the electroless nickel plating tank 116 and the nickel plating solution 118 cause a reduction reaction.

An electroless nickel plating layer 104 is formed as a result of the reduction reaction of the zinc ion-coated aluminum material 100 and the nickel plating aqueous solution 118.

The filter mesh used for the nickel plating is 5 m And ph is for example 4.6.

In step S7, the resultant of step S6 is washed to remove the nickel sulfate solution.

In the state in which the zinc coating 102 having excellent adhesion to the aluminum material 100 and the electroless nickel plating layer 104 having excellent conductivity are formed, nickel plating by electricity may be performed to improve thermal conductivity and heating performance. The aluminum material 100 is placed in an electric nickel plating tank 120.

As shown in FIG. 9, a process of performing nickel plating by electricity on the aluminum material 100 on which the zinc film and the electroless nickel plating layer are formed is as follows.

In step S1, 5% to 10% of caustic soda solution is used to perform electrolytic degreasing to activate the surface for 3 to 5 minutes at 40 ° C to 50 ° C in an immersion manner.

The current density of the positive electrode plate is, for example, 10 A / dm to 15 A / dm.

In step 2, the resultant of step S1 is washed to remove the caustic soda solution.

In step 3, to neutralize the result of the step S2 to activate the surface by deposition method for 15 to 30 seconds at room temperature using nitric acid solution at 5% to 10%.

In step 4, the resultant of step S3 is washed to remove the nitric acid solution.

In step 5, the first nickel plating was performed on the resultant of step S4 for 30 to 60 minutes at room temperature by immersion on the activated surface using the nickel sulfate solution 180g / l and the nickel hydrochloride solution 150g / l and the hydrochloric acid solution. Proceed.

The primary nickel plating is matte plating.

The nickel metal eluted from the nickel anode plate 124 in the electroplating nickel plating tank 120 causes an electrochemical reaction. The electrochemical nickel plating layer 106 forms a thick film on the surface of the electroless nickel plating layer by the electrochemical reaction.

In step 6, the second nickel plating is carried out on the resultant obtained by performing the step S5 for 40 to 60 minutes at room temperature by immersion using the nickel sulfate solution 180g / l, the nickel hydrochloride solution 150g / l, the hydrochloric acid solution and the brightener. .

The secondary nickel plating is a bright plating.

In step 7, the resultant of step S6 is washed to remove the nickel sulfate solution, the nickel hydrochloride solution and the hydrochloric acid solution.

In step 8, the nickel plated oven is dried at a temperature of 90 ° C. to 105 ° C. for 5 to 10 minutes by a hot air drying method.

As described above, the oven of the induction heating cooker according to the present invention has the effect of improving the thermal conductivity and heating performance by plating nickel to improve the bonding strength.

In addition, the manufacturing process of the oven of the induction heating cooker can improve the performance and reliability of the product by triple surface treatment on the aluminum material to improve the bonding strength, and can prevent material loss due to defective products and can be recycled have.

In addition, there is an effect that can reduce the price of the oven of the induction heating cookware according to the present invention to about half the price of the conventional oven.

Claims (8)

In the oven of the induction heating cooker made of aluminum and cooked by induction heating, The oven of the induction heating cooker, characterized in that the nickel layer is formed on the aluminum material drawn in the shape of the oven. The method of claim 1, The oven of the induction heating cooker, characterized in that the zinc layer is formed to increase the adhesion between the aluminum material and the nickel layer. In the manufacturing method of the oven of the induction heating cooker made of aluminum and drawn in the shape of an oven, A zinc layer forming step of forming a zinc layer on the surface of the aluminum material by substituting zinc with the aluminum material drawn in the shape of an oven; The method of manufacturing an oven of an induction heating cooker, characterized in that consisting of a nickel layer forming step of forming a nickel layer by plating the nickel by the chemical reaction of the nickel-plated aqueous solution to the resulting zinc layer forming step. The method of claim 3, wherein In the nickel layer forming step of forming a nickel layer by a chemical reaction with a nickel plating solution, an electroless nickel layer is formed by plating nickel in an electroless state by a reduction reaction of the nickel plating solution on the resultant of the zinc layer forming step. Forming an electroless nickel layer, Manufacture of an oven of an induction heating cooker, characterized in that the electroless nickel layer forming step is performed by electroplating nickel by the electrochemical reaction of the nickel plating solution to form an electric nickel layer forming step of forming an electric nickel layer Way. The method of claim 3, wherein An etching step of unevenly etching the surface of the aluminum material by depositing an aluminum material drawn in an oven shape in a caustic soda solution to form a zinc layer; A first cleaning step of cleaning to remove the caustic soda component by spraying a cleaning solution from the result of the etching step; A nitric acid / fluoric acid treatment step of proceeding with nitric acid treatment and hydrofluoric acid treatment in which the nitric acid solution and hydrofluoric acid solution are deposited on the resultant of the first cleaning step to activate the surface of the resultant product; A second cleaning step of cleaning to remove the nitric acid solution and the hydrofluoric acid solution remaining in the result of the nitric acid / fluoric acid treatment step; Forming a zinc film by depositing a zinc phosphate solution as a reaction accelerator on the resultant of the second washing step; A third washing step of washing to remove the zinc phosphate solution from the resultant of the first zinc layer forming step; An acidic washing step of depositing nitric acid solution on the resultant in which the third washing step is performed and washing with acidic solution; And a secondary zinc layer forming step of forming a zinc film by depositing a zinc phosphate solution as a reaction promoter on the resultant of the acidic washing step. The method of claim 4, wherein An electrolytic degreasing step of installing an iron plate on the positive electrode plate to form a nickel plated layer by electrolessness and performing electrolytic degreasing to activate a surface on which a zinc layer is formed by the negative electrode method; A first cleaning step of cleaning contaminants from the result of the electrolytic degreasing step; An acid treatment step of acid treatment to remove oxides using a hydrochloric acid solution to the result of the first washing step; A second washing step of washing to remove hydrochloric acid solution in the resultant acid treatment step; A nickel layer forming step of nickel plating using nickel sulfate on the resultant of the second washing step; Method for producing an oven of induction heating cooker, characterized in that consisting of a third cleaning step for cleaning to remove the nickel sulfate solution from the result of the nickel layer forming step is performed. The method of claim 6, The nickel plate is installed on the positive electrode plate to instantaneously flow the current to form the nickel layer, and further includes a nickel strip step of performing nickel strips to form the nickel layer of the thin film using the nickel chloride solution and the hydrochloric acid solution. Method for producing an oven of induction heating cookware, characterized in that. The method of claim 4, wherein An electrolytic degreasing step in which a caustic soda solution is deposited to form a nickel layer by electricity and electrolytic degreasing to activate a surface on which a nickel layer is formed; A first cleaning step of cleaning to remove contaminants from the result of the electrolytic degreasing step; A neutralization step of neutralizing the nitrate solution to activate the surface by depositing the nitric acid solution on the result of the first cleaning step; A second washing step of washing to remove nitric acid solution from the result of the neutralization step; Forming a primary nickel layer by depositing a nickel sulfate solution, a nickel hydrochloride solution, and a hydrochloric acid solution on the resultant of the second washing step; Forming a secondary nickel layer by depositing a nickel sulfate solution, a nickel hydrochloride solution, a hydrochloric acid solution, and a brightener on the resultant of the primary nickel layer forming step; A third washing step of washing to remove the nickel sulfate solution, the nickel hydrochloride solution and the hydrochloric acid solution from the result of the second nickel layer forming step; The method of manufacturing an oven of an induction heating cooker, characterized in that the drying step of drying in a hot air drying method on the result of the third cleaning step.