KR20130010352A - Inner-pot of electrical cooker having laser carving logo thermal spraying layer and method for manufacturing the same - Google Patents

Abstract

PURPOSE: An electric cooker with a sprayed layer for a laser-carved logo and a manufacturing method thereof are provided with an improved design as the laser-carved logo is formed on the outer surface. CONSTITUTION: A method for manufacturing an electric cooker with a sprayed layer for a laser-carved logo comprises following steps. The outer surface of a container body is pre-processed(S10). A sprayed layer is formed on the outer surface of the container body by using first coating materials(S20). The outer surface of the container body is post-processed(S30). The sprayed layer for a logo is formed on the outer surface of the container body by using second coating materials(S40). The outer surface of the container body is washed and grinded(S50). A painting layer is formed on the outer surface of the container body(S60). The sprayed layer for the logo is carved by lasers(S70). [Reference numerals] (S10) Lot test and pre-processing of a container body; (S20) Forming a sprayed layer on the outer surface of the container body; (S30) Post-processing the outer surface of the container body; (S40) Forming a sprayed layer for a logo on the outer surface of the container body; (S50) Cleaning and surface treatment of the outer surface of the container body; (S60) Forming an outer painting layer on the outer surface of the container body; (S70) Carving the outer surface of the sprayed layer for the logo by lasers

Description

Inner-pot of electrical cooker having laser carving logo thermal spraying layer and method for manufacturing the same}

The present invention relates to an inner pot for an electric cooker, and more particularly, to an inner pot for an electric cooker provided with a sprayed layer for laser marking a logo so as to have excellent appearance and corrosion resistance.

In general, an electric cooker is a device that accommodates food in the inner pot and heats the inner pot to a state of high temperature and high pressure to cook the food, and according to a heating method for cooking, a resistance heater heating method and induction heating (Induction heating, IH). Induction heating type electric cooker, electric rice cooker, electric pressure cooker, electric pot, induction range, etc. are currently used a lot.

Hereinafter, an induction heating type electric pressure cooker will be described as an example in which a conventional inner cooker inner pot is applied.

1 is a view showing a cross section of a conventional electric cooker.

As shown in FIG. 1, the electric cooker includes a main body 100, a lid 200, an inner pot 300, and a coil base 400.

Here, the upper portion of the main body 100 is rotatably connected to the lid 200, the inside thereof comprises a coil base 400 is wound around the winding coil for heating the inner pot 300. The inner pot 300 is provided to accommodate food therein, and is detachably coupled to the main body 100.

Here, the inner pot 300 is made of a container shape as a material such as aluminum, the outer surface is provided with a thermal sprayed layer of a magnetic material for electric induction heating. At this time, when a high frequency current is induced in the working coils disposed around the sprayed layer, the inner pot is heated by the resistance of the current induced in the sprayed layer, thereby being used as a heat source for cooking food.

On the other hand, since the heat-resistant paint is coated on the outer surface of the conventional inner pot to form a coating layer, it was difficult to provide a beautiful appearance of the inner pot due to the dark and dull color of the heat-resistant paint. In addition, consumers are more than simply pursuing functions as the standard of living develops, and the desire for high-quality design of the product's appearance is also rising, so that differentiating designs are needed for the inner pot for electric cookers.

In order to solve this problem, Korean Utility Model Publication No. 20-2010-0007716 shows a visual effect by displaying the design text and logo on the inner pot of the electric cooker using a screen printing method. However, since the screen printing marking is a method of marking a logo on the outside of the inner pot by supplying ink with a brush, the logo may be peeled off the inner pot when used for a long time, thereby deteriorating durability and appearance.

Further, although a study was performed to engrav the outer surface of the inner pot coated with the heat-resistant paint to display a logo, etc., the heat-resistant paint of the engraved portion was peeled off and the sprayed layer was exposed to the outside to corrode and stain. For this reason, there was a problem that harms hygiene and appearance.

In order to solve the problems as described above, an object of the present invention is to provide an inner pot for an electric cooker equipped with a sprayed layer for laser stamping the logo so as to have excellent visibility and corrosion resistance on the outer surface and a manufacturing method thereof.

In order to solve the above problems, the present invention comprises a first step of pre-processing the outer surface of the container body; A second step of forming a sprayed layer by spraying a first sprayed material on an outer surface of the container body; A third step of post-processing on an outer surface of the container body; A fourth step of forming a sprayed layer for logo to form an embossed surface by spraying a second sprayed material on the outer surface of the container body; A fifth step of cleaning and surface polishing the outer surface of the container body; A sixth step of forming an outer coating layer on an outer surface of the container body; And it provides a method for producing an inner pot for an electric cooker equipped with a laser-stamped logo spraying layer comprising a seventh step of processing the logo spraying layer with a laser.

Here, the thickness of the outer coating layer is formed as 35 ~ 55 ㎛, in the seventh step, the laser power for the laser engraving process is 20 ~ 40% output power 40 40 W, its frequency is 18 ~ 22 kHz It is preferable. In addition, the marking speed of the laser is preferably set in the range of (1300- (20 x output%) ± 50) mm / sec.

Further, the seventh step is preferably made further comprising the step of cleaning the outer surface of the container body is formed with the sprayed layer for the logo and adding a clear coating layer.

Here, the container body is preferably made of one of Al, STS, Mg, Ti, natural stone, carbon molded single material, an alloy made of at least two or a single material and clad metal (clad metal). In addition, the thermal spraying layer is preferably characterized in that the thermal spraying layer formed by spraying a magnetic metal.

In addition, the thermal sprayed layer for the logo may have any one of a line, a figure, a pattern, and a letter, or a combination of two or more.

On the other hand, the container body; A sprayed layer formed by spraying a first sprayed material on an outer surface of the container body; A thermal sprayed layer formed on the outer surface of the thermal sprayed layer to protrude to form an embossed second sprayed material; And an outer coating layer formed on the outer surface of the sprayed layer for the logo and the sprayed layer, the outer coated layer formed on the outer surface of the sprayed layer for the logo is provided with a laser-stamped logo sprayed layer formed by using a laser. It is preferable to provide an inner pot for the cooker.

Further, it is preferable that an inner pot for an electric cooker provided with a laser-stamped logo spraying layer characterized in that it further comprises a clear coating layer formed on the outer surface of the container body including the laser-stamped logo spraying layer. .

The present invention provides the following effects through the above solution.

First, by providing a thermal spray layer for the logo on the outside of the inner pot, and laser engraving on the outer surface of the inner pot to stamp the logo, to provide users with an inner pot with a simple cooking function, high-quality design of the product It can provide the shoes, and can provide the differentiated design of the inner pot of the electric cooker.

Second, when the logo is displayed on the heat-resistant paint layer formed on the outer surface of the inner pot through the manufacturing method of the electric cooker with the laser engraved logo spray layer, the heat-resistant paint is peeled off to form the container body of the inner pot It can prevent hygiene and appearance problems due to corrosion and rust caused by the exposure of the material.

Third, since the separate processing is not required after the laser engraving work on the inner pot for the electric cooker can simplify the process.

1 is a cross-sectional view of an electric cooker equipped with a conventional inner pot.
Figure 2 is a flow chart of the manufacturing method of the inner cooker equipped with a sprayed layer for laser engraved logo according to an embodiment of the present invention.
Figure 3a to Figure 3e is a cross-sectional view of the inner pot according to the manufacturing step of the electric cooker inner pot equipped with a sprayed layer for laser engraved logo according to an embodiment of the present invention.
Figure 4 is a schematic diagram of a laser engraving device used in the manufacture of the inner pot for cooking electric cooker equipped with a sprayed layer for laser engraved logo according to an embodiment of the present invention.
Figure 5 is a photograph of the inner pot for cooking electric cooker equipped with a sprayed layer for laser engraved logo according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings it will be described in detail an inner cooker for an electric cooker equipped with a sprayed layer for laser engraved logo according to a preferred embodiment of the present invention and a manufacturing method thereof.

2 is a flowchart illustrating a method of manufacturing an inner pot for an electric cooker provided with a sprayed layer for a laser engraved logo according to an embodiment of the present invention, and FIGS. Cross-sectional view of the inner pot according to the manufacturing step of the inner cooker equipped with a thermal spraying layer.

As shown in Figures 2, 3a to 3e, the method of manufacturing the inner cooker 300 for the electric cooker provided with the laser-printed logo spray layer 30 is as follows.

First, referring to FIG. 3A, after manufacturing a container body 10 having a container shape in which food is accommodated in an aluminum material or the like, a pretreatment process such as cleaning and sand blasting is performed (S10). At this time, the sand blasting process is to process the external roughness to increase the adhesion of the sprayed layer 20 to be applied to the container body 10 by spraying the blasting powder made of a material such as aluminum oxide at a high speed to the inner pot surface. It means the process.

Here, the container body 10 is preferably made of aluminum, magnesium, titanium, stainless steel, natural stone, carbon moldings and a plurality of mixed materials thereof, but may also be made of a clad metal material.

Next, a process of forming the sprayed layer 20 by spraying a first sprayed material such as magnetic metal or ceramic such as stainless steel or iron on the outer surface of the container body 10 is performed (S20). Here, the thermal spraying process refers to a process of forming the thermal spraying layer 20 by laminating the first thermal sprayed material from a high temperature heat source to a liquefied or particulate state and impinging on the outer surface of the body member at a high speed to rapidly solidify it.

In detail, the container body 10 made of a metal material that is not easy to self-induction heating, such as aluminum, magnesium, titanium, it is preferable to spray a magnetic metal such as stainless steel or iron. On the other hand, the material of the container body 10 is preferably a non-magnetic metal sprayed in the case of the clad metal of the aluminum and stainless compression bonding capable of induction heating.

Here, the thermal spraying layer 20 preferably includes both the thermal spraying layer 20 formed by spraying a non-magnetic metal and the thermal spraying layer 20 formed by spraying a magnetic metal.

Referring to FIG. 3B, in forming the sprayed layer 20, the container body 10 rotates at 600 RPM and automatically sprays the first sprayed along the outer surface a of the container body configured to have a sprayed round. It is preferable to spray the ash powder to form the sprayed layer 20.

At this time, the thermal spraying layer 20 is not formed on the flange portion 21 and the temperature sensor contacting portion 22 positioned on the lower end of the container body 10. This may cause problems such as scratching, peeling, etc. of the thermal sprayed layer due to friction occurring when the locking device of the flange portion 21 and the electric cooker lid 200 performs locking / unlocking. In the case of spraying on the temperature sensor contact portion 22, since the inner pot detection temperature is different depending on the variation of the spraying amount, it is preferable that the first spraying material is not sprayed because problems such as cooking and thermal insulation failure occur.

Next, a post-processing sandblasting blasting process is performed on the outer surface of the container body 10 in which the thermal spraying layer 20 is formed to remove impurities and the thermal spraying of the flange 21 and the temperature sensor contacting part 22. Perform (S30).

As shown in FIG. 3C, the thermal spraying layer 30 is formed on the outer surface of the container body on which the thermal spraying layer 20 is formed by spraying a second thermal spraying material such as aluminum on a non-magnetic metal or ceramic to a thickness of 0.2 mm. To perform a process (S40). The logo spray layer 30 is embossed, preferably used to produce the logo 301 by performing a laser engraving process.

On the other hand, the first spray material and the second spray material is preferably used without being limited to any one of a metal material and a ceramic material.

Here, when the thickness of the sprayed layer 30 for the logo is thick, interference with the coil base may occur, or resonance characteristics for induction heating may vary, and when the thickness is thin, visibility and workability and efficiency in laser processing may be increased. It becomes low and the case where the thermal spraying layer 30 peels occurs.

In addition, in order to increase the adhesion of the thermal spray layer 20 to be applied to the container body 10, the container body 10 is cleaned, and a surface polishing process for processing the external roughness is performed (S50).

Here, the surface polishing process is fine and smoothly the outer surface of the container body 10 at a level that does not affect the resonance characteristics for induction heating.

Referring to FIG. 3D, a process of forming an outer coating layer 40 by painting a heat-resistant coating on the outer surface of the container body 10 after cleaning and surface polishing is performed (S60).

Through the above-described process, the manufactured inner pot 300 is composed of the container body 10, the sprayed layer 20, the sprayed layer 30 for the logo, the outer coating layer (40).

Here, the process of stamping the logo 301 through a laser engraving on the outer surface of the inner pot 300 is performed (S70).

In addition, after the entire manufacturing process may further include a process of coating the inside of the inner pot 300 with PTFE, diamond, ceramics and the like.

As shown in Figure 3e, by laser engraving to irradiate the laser, to express the internal color of the logo 301 by the process of discoloring while burning a portion of the embossed logo spray layer 30 at high heat, The outline is performed by performing an outer frame operation on the logo 301. At this time, since the stamping operation is performed on the embossed logo spray layer 30, the generated logo 301 is also embossed.

Due to this, it is possible to provide users with an advanced and differentiated design of the inner pot 300 for the electric cooker.

Figure 4 is a schematic diagram showing the configuration of the laser engraving device used in the inner pot for cooking electric cooker equipped with a sprayed layer for laser engraved logo according to an embodiment of the present invention, Figure 5 is a laser according to an embodiment of the present invention It is a picture of the inner pot for the electric cooker equipped with a stamped spray layer.

As shown in FIG. 4, the inner pot 300 is mounted on the rotatable jig part 500 to perform laser engraving. Then, the program inputs the marking speed, laser power, input design, etc. of the laser for stamping the logo on the control unit 700 of the laser engraving device, and the outer surface with the sprayed layer 30 for the logo of the inner pot 300 is provided. Position it so that it is engraved on. The laser marking unit 600 generates a laser in accordance with the input program of the laser marking device to perform the operation of marking the logo on the surface of the inner pot 300.

Referring to FIG. 5, the logo 301 is expressed on the sprayed sprayed layer 30 that is embossed through the laser engraving process on the outside of the inner pot 300.

Here, the thermal sprayed layer 30 for the logo may have any one shape, such as a line, a figure, a character, various patterns, or a combination of two or more. Therefore, the logo 301, which is imprinted on the outer surface of the thermal sprayed layer 30 for the logo, is also preferably combined with one or more shapes.

In addition, the method may further include adding a clear coating layer to an outer surface of the inner pot 10 manufactured by the method of manufacturing the inner pot 300 for the electric cooker provided with the laser-sprayed logo spray layer 30. have.

Table 1 shows the laser marking conditions of the inner pot manufacturing method for an electric cooker equipped with a sprayed layer for laser engraved logo. The laser marking conditions affect the visibility, corrosiveness and discoloration of the logo imprinted on the inner pot 300.

Lightly (Section Change) Thicken (remove external coating) Laser power (40 W) 20% 40% frequency 20 kHz 20 kHz Poly Delay 3 ㎲ 3 ㎲ Pulse width 200 nsec 200 nsec

Here, the medium of the laser marking device is preferably using carbon dioxide, and there is a frequency section that is reacted according to the frequency range of the laser for each material of the object being irradiated by the laser and imprinted on the logo spray layer 30. The frequency for the stamping of the outer coating layer is preferably set to 20 kHz intervals. At this time, the pulse width of the laser is preferably set to 200 nsec, which is the maximum power.

Here, the laser marking condition is a marking condition when the thickness of the outer coating layer 40 is 35 to 55 μm, and the marking condition may be changed according to the thickness of the outer coating layer 40.

When the laser is output to the laser engraving device at 40 W, the laser output intensity is set to 20 to 40%. At this time, when the laser output is less than 20%, the laser engraving occurs only on the surface of the inner coating layer 40 of the inner pot 300, and visibility is lowered. When the level is more than 40%, the visibility is good, but the outer coating layer 40 of the inner pot is removed. .

In detail, not only the thermal spraying layer 30 for the logo is exposed to the outside, but also the spraying layer 20 of the portion where the spraying layer 30 for the logo is not formed is exposed to corrosion when using the inner pot 300 There is a possibility of the call.

In addition, poly delay is set to 3 kPa. The poly delay is also referred to as the polygon delay, which means that the laser oscillation within the object matches the timing of the laser head oscillation and the movement of the scanhead between the point where the sides of the letter meet.

In detail, when performing the laser engraving on the inner pot 300, when the poly delay time is 3 로 or less, the angle of the point where the side and the side of the logo meet may collapse, and when the 3 ㎲ or more point the side and the side meet The laser stays longer at the point where the dot can be spotted.

On the other hand, when the laser marking speed follows a setting range of (1300- (20 x output%) ± 50) mm / sec with respect to the value of the output% of the laser output, the logo 301 having good cyanness can be produced. .

Table 2 is a result of the salt immersion test and visibility test results of the logo 301 surface to determine whether the stamped logo 301 is defective for the marking range setting range. In this case, the laser marking conditions were to supply a laser power of 40 W intensity, and output the output% to 30% to perform laser engraving.

Here, the salt immersion test was precipitated for 200 hours at room temperature in a 5% NaCl aqueous solution to the logo formed on the outer coating layer, and then measured the degree of swelling, corrosion and rusting of the surface of the logo (301).

In addition, the visibility test confirms the sharpness of the logo on the surface, and the stamped logo 301, the outer coating layer 40 of the outer surface of the inner pot 300 is peeled off by the microscope whether the sprayed layer for the logo is exposed to the outside It was confirmed through.

Marking Speed
(mm / sec)

Experiment result
500

600

650

700

750

800

Salt immersion test

Outbreak
Outbreak
Good
Good
Good
-
Visibility results
Over stamping depth
Over stamping depth
Good
Good
Good
Poor visibility

As shown in Table 2, as a result of performing laser engraving on the inner pot 300 surface at marking speeds of 500 and 600 mm / sec, the visibility of the logo 301 is good, but the logo spraying layer is exposed, soaking in saline. An outbreak occurred during the test.

In addition, laser marking was performed on the inner pot 300 at marking speeds of 650, 700, and 750 mm / sec. Not only is the visibility of the formed logo 301 good, the logo imprinted on the inner pot 300 ( 301) did not damage the portion of the outer coating layer 40 did not occur for the salt immersion test.

On the other hand, when the laser marking operation on the inner pot 300 at a marking speed of 800 mm / sec, the imprinted logo 301 is too blurred visually, poor visibility.

Based on the results of this test, looking at the characteristics of the formation portion of the logo 300 for the laser marking speed in the inner pot 300 for the electric cooker equipped with the sprayed spray layer 30 for the logo, when the marking speed is slow Since the laser engraving process of the logo sprayed layer 30 to be imprinted is irradiated to the surface which a laser touches for a long time, the depth of imprinting becomes deep and visibility is improved.

However, it can be seen that the stamping of the thermal spray layer 20 provided in the outer coating layer 40 increases the possibility of rust. In addition, as the marking speed increases, the laser engraving speed of the inner pot 300 is shortened, and thus the depth of the engraving is lowered, and visibility is gradually reduced.

Therefore, when the thickness of the outer coating layer 40 is 35 ~ 55 ㎛, the laser output of the laser engraving device is 40 W, under the condition of 30% output power, 20 kHz laser frequency, 650 ~ 750 mm / sec When the logo 301 is stamped on the inner pot 300 at a marking speed within a range, the visibility is good, and whether or not the appearance of the salt water is good, it can have a portion of the logo 301 excellent in corrosion and durability. It can be seen that this applies to the formula of the setting range of (1300-(20 x output%) ± 50) mm / sec.

At this time, the marking speed is slow when the laser output intensity is large, and the marking speed should be faster when the laser output intensity is small. When the laser power under the laser engraving condition is 40% or more, or the marking speed becomes slow, the amount of laser irradiated to a predetermined outer surface width of the thermal spraying layer 30 for the logo increases, thereby removing the outer coating layer 40. The coating may occur due to the logo spray layer 30 being exposed to the outside, and the spray layer 20 on the outer edge portion of the logo spray layer 30 may be exposed to the outside. Can be.

Thus, by stamping the logo 301 of a predetermined stamping depth on the outer coating layer 40 through the manufacturing method of the inner cooker 300 for the electric cooker provided with the laser-sprayed layer for logo 30 is presented, The logo 301 may be improved in visibility.

Thus, the external coating layer 40 is peeled off to prevent the hygiene and appearance problems due to corrosion and rust caused by the spray layer 20 forming the container body 10 of the inner pot 300 is exposed. It becomes possible.

As described above, the present invention is not limited to the above-described embodiments, but may be modified and implemented by those skilled in the art without departing from the scope of the claims of the present invention. Such modifications are within the scope of the present invention.

10: container body 20: thermal spray layer
21: flange portion 22: temperature sensor contact portion
30: spraying layer for logo 40: outer coating layer
50: laser engraving surface 100: main body
200: lid 300: inner pot
301: Logo 400: coil base
401: temperature sensor 500: jig portion
600: laser marking unit 700: control unit

Claims (9)

A first step of pretreating the outer surface of the container body;
A second step of forming a sprayed layer by spraying a first sprayed material on an outer surface of the container body;
A third step of post-processing on an outer surface of the container body;
A fourth step of forming a sprayed layer for logo to form an embossed surface by spraying a second sprayed material on the outer surface of the container body;
A fifth step of cleaning and surface polishing the outer surface of the container body;
A sixth step of forming an outer coating layer on an outer surface of the container body; And
A method of manufacturing an inner pot for an electric cooker provided with a laser-stamped logo spraying layer comprising a seventh step of processing the outer surface of the logo-sprayed layer with a laser. The method of claim 1,
The thickness of the outer coating layer is formed as 35 ~ 55 ㎛,
In the seventh step, the laser output for the laser engraving process is 20 ~ 40% output 40% 40 W, its frequency is 18 ~ 22 kHz, characterized in that for electro-cooker equipped with a sprayed layer for laser imprinted logo Method of manufacturing the inner pot. The method of claim 2,
Marking speed of the laser is (1300- (20 × output%) ± 50) manufacturing method of the inner pot for the electric cooker equipped with a sprayed layer for laser engraving logo, characterized in that set in the range of mm / sec. The method of claim 1,
The seventh step includes the step of cleaning the outer surface of the container body in which the sprayed layer for the logo is formed and the addition of a clear coating layer made of the inner pot for the electric cooker equipped with a laser-stamped logo sprayed layer characterized in that the Way. The method of claim 1,
The container body is for a laser-engraved logo, characterized in that the single material of Al, STS, Mg, Ti, natural stone, carbon molding, each of the single material is an alloy and clad metal of at least two or more Method of producing an inner cooker equipped with a sprayed layer. The method of claim 1,
The spraying layer is a method of manufacturing an inner pot for an electric cooker equipped with a sprayed layer for laser-inscribed logo, characterized in that the thermal spraying layer formed by spraying a magnetic metal. The method of claim 1,
The logo spray layer has a shape of any one of a line, a figure, a pattern and a letter, or a method of manufacturing an inner pot for an electric cooker equipped with a laser-stamped logo spray layer, characterized in that two or more combinations. The container body;
A sprayed layer formed by spraying a first sprayed material on an outer surface of the container body;
A thermal sprayed layer formed on the outer surface of the thermal sprayed layer to protrude to form an embossed second sprayed material; And
Including the outer coating layer formed by painting the outer surface of the sprayed layer for the logo,
The outer coating layer formed on the outer surface of the sprayed layer for the logo is an inner pot for an electric cooker equipped with a laser-stamped logo sprayed layer formed by stamping using a laser. The method of claim 8,
The seventh step is the inner pot for the electric cooker equipped with a laser-splatted logo spray layer, characterized in that further comprising the step of cleaning the outer surface of the container body is formed with the logo spray layer and adding a clear coating layer.

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