JP2563594B2 - Method of manufacturing electromagnetic induction heating pan - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing an electromagnetic induction heating pan for cooking by electromagnetic induction heating used in general households and the like.

2. Description of the Related Art Conventionally, as a pan cooked by electromagnetic induction heating, a pan in which stainless steel, iron, and stainless are clad has been generally used.Since the inner side of the pan is stainless steel, the cooked food may stick or burn. It was difficult to cook and wash.

Further, in order to solve the above, there was a pot in which a fluorine resin coat having a non-adhesive property was processed inside a pot in which A1100 series aluminum was clad inside and ferritic stainless steel was clad outside.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above conventional electromagnetic induction heating pan, since aluminum alloy and stainless steel are present on both sides, after clad roll processing, cutting of end clad defect portion in clad material of flat plate, There is always a chance that stainless steel will adhere to the aluminum alloy surface, such as circle-shaped die cutting and buff polishing for drawing the pan, and if stainless steel powder adheres to the aluminum alloy, it will be pushed by the roller press into a pit shape, It cannot be removed by post-processing, and the fluororesin coat is processed. The adhesion of powder of stainless Fe and Cr components to the Al base material causes corrosion due to the potential difference in the local area, resulting in pitting corrosion, and in the worst case, the aluminum alloy may have holes. there were.

In particular, the process that stainless steel powder is likely to adhere is buffing on the outer surface. In the atmosphere of the processing plant, stainless steel powder adheres simply by placing a good pot, and when buffing the pot, the inside, Since the bottom side is processed while being rotated by human hands, stainless steel powder may be rubbed in.

The present invention solves the above-mentioned problems, and even in a clad material in which aluminum alloy and stainless steel are present on both sides, the possibility of stainless steel adhering to the surface of the aluminum alloy is greatly reduced in each step of pot processing. , It greatly reduces the corrosion of aluminum alloys in pots.

Means for Solving the Problems In order to achieve the above object, the present invention, after clad processing of aluminum alloy and stainless steel, film coating on the surface of the aluminum alloy, subsequent cutting, die cutting, polishing, drawing and the like. After performing the steps necessary for processing the pot, the film coating is peeled off, and the surface coating of the fluororesin coating is performed.

Further, in particular, before the outer surface buffing of stainless steel, the aluminum alloy surface is film-coated or fluororesin-coated.

Action Aluminum alloy and stainless steel are clad roll processed,
For example, a film is attached to the aluminum alloy surface after alkali cleaning. The aluminum alloy surface with the film on which the stainless steel is on the back side is the subsequent processing such as cutting of the defective end clad, inspection process, circle die cutting for drawing into a pot shape (especially at the leveler during this processing) Stainless steel powder jumps into the aluminum alloy surface), pan-shaped drawing, flange cutting, stainless steel surface buffing, etc., and during the transportation between them, the stainless steel powder on the back surface jumps in, etc. Although there are many opportunities for foreign matter to adhere, the film is attached to prevent the aluminum alloy material from adhering to the surface. By this action, stainless steel Fe and Cr
It prevents the adhesion of precious metals such as the Al component of the aluminum alloy, and prevents corrosion such as pitting due to the local potential difference.

In addition, the aluminum alloy surface is protected by a film or a fluororesin film that has been previously fluororesin coated before the buffing of the stainless steel surface where the stainless powder is most likely to adhere to prevent corrosion such as pitting corrosion due to the local potential difference. It is a thing. When the protective coating is formed of a fluororesin film, the coating may not be removed and the inner side fluororesin coat of the finished pot may be used as it is.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

An aluminum alloy A1 containing 0.2 to 2.0% of Mn and Mg components, respectively, and an aluminum alloy B2 containing 99% or more of Al are clad. Next, the ferritic stainless steel 3 heated by electromagnetic induction and the above-mentioned aluminum alloy two-layer clad material are roll-clad under high temperature and high pressure to form a flat clad material.

It should be noted that, even if it is a two-layer clad of aluminum alloy A1 and stainless steel 3, or if aluminum alloy A1, aluminum alloy B2 and stainless steel 3 are simultaneously clad processed, it is heated by electromagnetic induction instead of stainless steel 3. A material obtained by sandwiching iron with stainless steel may be used, and the point is that the surface coated with the fluororesin is aluminum alloy A1.

After clad roll processing, alkali cleaning is performed to remove oil, dust, etc., and then a film is attached to the surface of the aluminum alloy A1. The clad material coated with a film is used for the cutting process of the end clad defect part, the inspection process, the circle die cutting process for processing in the pot shape, the pot shape drawing process, the flange part cutting process, the stainless surface buff polishing process, etc. During each process and during transportation and storage between them, even if the powder of Steres 3 on the back surface jumps in and other foreign matter adheres, the film coating prevents the aluminum alloy A1 from adhering to the aluminum alloy A1. The fluororesin coat is processed without sticking to the surface. The peeling process of film coating is
Before the fluororesin coating process is preferable, the film coating may be peeled off in the previous step depending on the arrangement of the steps.

Next, the state of foreign matter adhesion was tested on each of 400 samples with and without this film coating. When film coating is present, foreign matter adherence is 6%, whereas when there is no film covering, it is 66%, which is 11 times the foreign matter adherence amount. Corrosion occurs with such a probability, of course, it is rejected as a defect at the time of inspection, so the yield Was very bad. With this film coating, the cost is greatly improved by significantly improving the yield, and the probability of corrosion of the aluminum alloy A1 due to foreign matter adhered due to inspection failure is greatly reduced.

EFFECTS OF THE INVENTION In the conventional manufacturing method, the aluminum alloy and stainless steel clad materials often cause the powder of the stainless steel on the back surface to jump into the aluminum alloy, but by coating the aluminum alloy with a film, the aluminum alloy in each processing step Prevents stainless steel powder and other foreign matter from adhering to the surface of the product, significantly improving the yield and reducing the cost accordingly, and significantly corroding pitting corrosion caused by foreign matter such as stainless steel powder. It is possible to provide a safe and long-lasting method for producing an electric energy induction heating pan by reducing the amount.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an electromagnetic induction heating pan showing an embodiment of the present invention. 1 ... Aluminum alloy A, 2 ... Aluminum alloy B, 3 ... Stainless steel, 4 ... Fluororesin, 5 ... Top fluororesin.

Claims (2)

(57) [Claims] 1. After clad processing an aluminum alloy and stainless steel, a film coating is applied to the surface of the aluminum alloy, and after performing necessary steps for processing a pan such as cutting, die cutting, polishing, and drawing, A method for producing an electromagnetic induction heating pan, wherein the film coating is peeled off and a surface coating of a fluororesin coating is performed. 2. The method for manufacturing an electromagnetic induction heating pan according to claim 1, wherein the aluminum alloy surface is film-coated or fluororesin-coated before the outer surface buffing of stainless steel.