Cold spray pot with bottom oil accumulating function and manufacturing method therefor

Abstract

To provide a manufacturing method for a cold spray pot with a bottom oil accumulating function.SOLUTION: The method comprises: a step of forming a sheet material of aluminum alloy into a shape of a pot billet 1, with an annular boss 11 protruded from the outer bottom and a cambered surface protruded outward formed in a central area of the bottom; a step of performing oil removal and internal sandblasting operation so that surface roughness reaches Ra 2.8 to Ra 4.5; a step of spraying non-stick paint onto an inner surface of the pot billet to obtain a non-stick coating; a step of cold spraying magnetic conductive powder onto the outer bottom of the pot billet to obtain a magnetic conductive coating, and then arc spraying metallic aluminum onto the magnetic conductive coating to obtain an anti-rust coating; a step of polishing the outer wall of the pot billet; and a step of spraying high-temperature-resistant non-stick paint onto the overall outer surface of the pot billet.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of pan technology, and more particularly to a cold spray pan with bottom oil collection function and a method for manufacturing the same. [Background technology]

[0002] Most conventional stove panels for household induction cookers, microwave cookers, radiant heaters, etc. are flat, and the bottoms of pots used in these cookers are designed to protrude slightly inward to prevent the pot from shifting or rotating on the stove panel. Furthermore, the outer bottom of the pot is usually provided with a magnetic strip that reacts to the high-frequency magnetic field of the stove, such as an induction cooker, and transfers energy into the pot to heat it.

[0003] Conventional magnetic flakes are generally integrated into the outer bottom of the aluminum substrate. Due to the difference in thermal expansion coefficients between the magnetic flakes and the aluminum substrate, the bottom of the pot protrudes into the pot to different degrees during the heating process, and protrudes inward more as the temperature rises. This causes cooking oil poured into the pot to flow around the bottom of the pot during cooking, resulting in oil chipping in the middle of the bottom of the pot, which affects the cooking effect of food. In addition, due to the difference in the expansion coefficients of the two, there is a problem that defects such as local cracks are likely to occur between the film layers after long-term use.

[0004] In view of this, there is a need to develop a pan that has a bottom oil collecting function and is suitable for long-term use. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above-mentioned disadvantages of the prior art, and provides a method for manufacturing a cold spray pan with a bottom oil collection function, thereby solving the problem that the conventional pan manufacturing method is unable to manufacture a pan with a bottom oil collection function and capable of efficient electromagnetic heating and heat conduction for a long period of time under high temperature conditions. [Means for solving the problem]

[0006] To achieve the above objectives, the technical solutions adopted by the present invention are as follows:

[0007] A method for manufacturing a cold spray pan with bottom oil collection function, the method comprising: S1: In the pot body forming operation, a large-tonnage press is used to form an aluminum alloy sheet material into a pot blank shape, and an annular boss protruding outward is formed on the outer periphery of the outer bottom of the pot blank, and an arcuate surface protruding outward is formed in the bottom center region of the pot blank; In the S2 pretreatment operation, the pot blank obtained in step S1 is subjected to oil removal and internal sand boiling operation to make the inner surface roughness of the pot blank reach Ra2.8 to Ra4.5; S3: In the internal spray coating operation, use an internal spray coating device to spray a non-stick paint onto the inner surface of the pot blank obtained in step S2 to obtain a non-stick coating film. The internal spray coating device and the non-stick paint of the present application are both prior art means in this field, and will not be described here. For example, the non-stick paint of the present application can be selected as polytetrafluoroethylene paint. For example, refer to any of the prior art related to non-stick paint materials disclosed in the following patent documents, such as CN202110239015.3, CN201910589192.7, CN202110239029.5, CN202210256925.7. S4 outer bottom spray coating operation, first use cold gas spray coating equipment to cold spray magnetic powder onto the outer bottom of the pot blank obtained in step S3 to obtain a magnetic conductive coating film, then use arc spray coating equipment to arc spray coat metal aluminum onto the magnetic conductive coating film to obtain an anti-rust coating film; In step S5, the outer wall of the pot material obtained in step S4 is polished by a polishing machine to remove defects such as scratches and indentations on the outer wall surface of the pot material. S6: In the external spray coating operation, an external spray coating device is used to spray a high-temperature protective outer layer onto the outer surface of the entire pot material obtained in step S5, and finally a cold spray pot with the bottom oil collection function is obtained.

[0008] As a preferred technical solution, the height H between the center point of the outermost arc surface and the outer periphery of the annular boss is 1.0 to 1.5 mm.

[0009] As a preferred technical solution, in the oil removal operation, the oil and grease on the surface of the pot material are first removed using sodium hydroxide solution, followed by washing with water, and then neutralizing with dilute nitric acid at room temperature, and finally washing with water and drying to obtain a clean pot material.

[0010] As a preferred technical solution, in the internal sand-blowing operation, a sand-blowing machine is used to uniformly spray 60 mesh or 80 mesh brown dissolved alumina sand onto the inner surface of the pot blank at an air pressure of 0.6 to 0.7 MPa, so as to meet the roughness required for internal spray painting.

[0011] In a preferred technical solution, the cold spraying operation in step S4 specifically includes the following steps: In a cold gas spray coating machine, magnetically conductive powder metal particles (magnetically conductive iron powder or 430 magnetically conductive powder) are accelerated to a critical velocity using an inert compressed gas at a temperature of 800-900°C as an acceleration medium, causing the metal particles to collide with the outer bottom surface of the pot blank at a supersonic speed of 800-1000 m / s in a solid state, causing the particles to undergo severe plastic deformation and deposit, forming a magnetically conductive coating. The thickness of the magnetically conductive coating is controlled between 150-200 μm, and the metal particles are not melted at low temperatures throughout the cold spraying process. The acceleration medium is an inert gas (nitrogen gas, temperature 800-900°C), so the metal particles are not melted or oxidized, preserving the original physical and chemical properties of the material. In the cold spraying process of the present invention, the magnetically conductive iron powder or 430 magnetically conductive powder (with a particle size of 15-45 μm) is deposited on the outer bottom of the pot material at an extremely high speed, so the particles are overlapped and not integrated like the conventional cold composite bottom and thermal composite bottom. This results in little deformation when heated, and because the magnetically conductive metal particles are uniformly deposited on the outer bottom of the pot material, there is no hole blocking between the particles like in the conventional cold composite bottom. When used on a stove such as an induction cooker, the magnetically conductive power is close to that of a thermal composite bottom product and is much greater than that of a conventional cold composite bottom product.

[0012] As a preferred technical solution, the arc spray coating operation in step S4 specifically includes the following steps: Using an arc generated between two continuously fed aluminum wires as a heat source, the aluminum wires are melted by an arc spray coating machine. The molten aluminum wire is atomized with 0.6-0.7 MPa compressed air, and the atomized aluminum droplets are accelerated and sprayed onto the outer bottom surface of the pot blank at a speed of 120-180 m / s, forming a single layer of aluminum anti-rust coating. The thickness of the anti-rust coating is controlled between 5 and 10 μm. Because permeable iron powder or 430 permeable powder is prone to rust when exposed to air, water, or salt, the present invention avoids problems such as rusting of the permeable iron powder or 430 permeable powder by spraying a permeable coating onto the outer bottom surface of the pot blank using cold gas, followed by spraying a single layer of aluminum anti-rust coating using an arc.

[0013] As a preferred technical solution, before performing the cold spray operation in step S4, the outer bottom surface of the pot material is first subjected to ion beam treatment (operated at a voltage of 2500V), and the gas used in the ion beam treatment is a mixture of 15 sccm argon gas and 5 sccm sulfur dioxide, to form a sulfur interface material layer on the outer bottom surface of the pot material with a thickness of not more than 5 atomic layers. In the present invention, a high-energy ion beam is used to break and recombine chemical bonds, causing sulfur atoms to bond with the metallic aluminum atoms of the pot material substrate. After a nucleation reaction, stable chemical bonds are formed and the sulfur atoms adhere to the surface of the pot material. In the subsequent cold spraying process, the magnetically conductive powder metal particles undergo a high-temperature reaction with a sulfur interface material layer not exceeding five atomic layers thick under the action of an inert compressed gas at 800-900°C, forming strong chemical bonds with iron sulfide. This improves the bonding strength between the cold sprayed magnetically conductive coating and the pot material substrate, preventing defects such as cracks or fine patterns from occurring after long-term use due to differences in the expansion coefficients of the functional coating material and the aluminum alloy pot material. This also extends the service life of the cold sprayed pot and improves its cooking effect.

[0014] As a preferred technical solution, after the cold spraying operation in step S4, the magnetically conductive coating surface is further subjected to ion beam treatment (operated at a voltage of 2500V), and the gas used in the ion beam treatment is a mixture of 20 sccm argon gas and 10 sccm sulfur dioxide, to form a sulfur interface material layer with a thickness of 5 to 10 atomic layers on the magnetically conductive coating surface of the pot material. Similarly, the present invention uses a high-energy ion beam to first cause sulfur atoms to react with iron atoms in the magnetically conductive powder metal particles through chemical bond cleavage and recombination, forming stable chemical bonds that attach to the surface of the magnetically conductive coating. During the subsequent arc spray coating process, the atomized high-temperature aluminum metal droplets react with the sulfur interface material layer, which is 5 to 10 atomic layers thick, in the magnetically conductive coating, forming strong chemical bonds with aluminum sulfide. This improves the bonding strength between the aluminum protective anti-corrosion coating and the magnetically conductive coating, preventing defects such as cracks or fine patterns from occurring after long-term use due to differences in the expansion coefficients of different material functional coatings, and further extends the service life of the present invention's cold spray pan and improves its cooking effect.

[0015] As a preferred technical solution, in step S6, the protective outer layer can be selected from at least one of high temperature paint, ceramic paint, and anti-stick paint, for example, see the prior art related to any coating material disclosed in CN201910589481.7, CN201910589193.1, CN202110239015.3, CN201910589192.7, CN202110239029.5, CN202210256925.7, etc.

[0016] Another aspect of the present invention provides a cold spray pan with bottom oil collection function, which can be manufactured by the above-mentioned method for manufacturing a cold spray pan with bottom oil collection function. [Effects of the Invention]

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] This application describes a method for manufacturing a cold spray pan with bottom oil collection function, in which a pan blank is formed into an annular boss and an arc surface, and after pre-treatment and internal spray coating operations, the bottom of the pan is guaranteed to have good oil collection function, thereby improving the cooking effect of the pan. Furthermore, by using the cold spray and arc spray coating operations, the interfacial material functions of different atomic layer numbers are combined to obtain a pan that can perform efficient electromagnetic heating and heat conduction for a long period of time under high temperature conditions, thereby further ensuring the pan's long service life and good cooking effect. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram of the structure of the cold spray pan with bottom oil collection function of the present invention. [Figure 2] FIG. 2 is a partially enlarged view of part A in FIG. [Figure 3] FIG. 3 is a partial enlarged view of part B in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following description is intended to disclose the present invention and to enable those skilled in the art to realize the present invention. The preferred embodiments in the following description are given as examples only, and other obvious variations may occur to those skilled in the art. [Example]

[0021] As shown in Figures 1 to 3, the manufacturing method of the cold spray pan with bottom oil collection function in this embodiment includes the following steps:

[0022] In the S1 pot body forming operation, a large-tonnage press is used to form an aluminum alloy sheet material into the shape of a pot blank 1. An outwardly protruding annular boss 11 is formed on the outer peripheral edge of the outer bottom of the pot blank 1, and an outwardly protruding arc surface 12 is formed in the central region of the bottom of the pot blank 1. The height H between the center point of the outermost surface of the arc surface 12 and the outer peripheral edge of the annular boss 11 is 1.0 to 1.5 mm.

[0023] In the S2 pretreatment step, the pot blank 1 obtained in step S1 is subjected to oil removal and internal sand-blasting. In the oil removal step, the pot blank 1 surface is first degreased using a sodium hydroxide solution, then washed with water, and neutralized with dilute nitric acid at room temperature. Finally, the pot blank 1 is washed with water and dried to obtain a clean pot blank 1. In the internal sand-blasting step, 60-mesh brown dissolved alumina sand is uniformly sprayed onto the inner surface of the pot blank 1 at a pressure of 0.6 MPa using a sand-blasting machine, so that the roughness of the inner surface of the pot blank 1 reaches Ra3.6±4, which meets the roughness required for internal spray painting.

[0024] In the S3 internal spray coating operation, an internal spray coating device is used to spray non-stick paint onto the inner surface of the pot blank 1 obtained in step S2 to obtain a non-stick coating film 101, and the non-stick paint is selected to be polytetrafluoroethylene paint, with a thickness of 200 um ± 5 um.

[0025] In the outer bottom spray coating operation (S4), a cold gas spray coating machine is used to cold spray a magnetic powder onto the outer bottom surface of the pot blank 1 obtained in step S3, forming a magnetic conductive coating 102. Then, an arc spray coating machine is used to arc spray aluminum metal onto the magnetic conductive coating 102, forming an anti-rust coating 103. The cold gas spray coating machine uses 850°C inert compressed nitrogen gas as an accelerating medium to accelerate magnetic powder metal particles (magnetic iron powder with an average particle size of 25 μm) to a critical velocity, causing the metal particles to collide with the outer bottom surface of the pot blank 1 at a supersonic speed of 920 m / s in their solid state. This causes the particles to undergo severe plastic deformation and deposit, forming a magnetic conductive coating 102 with a thickness controlled to 180 μm ± 5 μm. The arc spray coating operation specifically includes the following steps: The arc generated between two continuously fed aluminum wires (diameter φ2 mm) is used as a heat source by the arc spray coating equipment to melt the aluminum wires (flame temperature approximately 3000°C), and the molten metal aluminum wire is atomized with 0.7 MPa compressed air. The atomized metal aluminum droplets are accelerated and sprayed onto the outer bottom of the pot material 1 at a speed of 160 m / s, forming a layer of aluminum anti-rust coating film 103, and the film thickness of the anti-rust coating film 103 is controlled to be between 10 um ± 1 um.

[0026] Before performing the cold spraying operation in step S4, the outer bottom surface of the pot blank 1 is first subjected to ion beam treatment (operated at a voltage of 2500 V) using a mixture of 15 sccm argon gas and 5 sccm sulfur dioxide gas to form a sulfur interface material layer (not shown) with a thickness of two atomic layers on the outer bottom surface of the pot blank 1. After performing the cold spraying operation in step S4, the surface of the magnetic conductive coating 102 is further subjected to ion beam treatment (operated at a voltage of 2500 V) using a mixture of 20 sccm argon gas and 10 sccm sulfur dioxide gas to form a sulfur interface material layer (not shown) with a thickness of eight atomic layers on the surface of the magnetic conductive coating 102 of the pot blank 1.

[0027] In the external polishing operation S5, the outer wall of the pot blank 1 obtained in step S4 is polished in a polishing machine to remove defects such as scratches and indentations on the outer wall surface of the pot blank 1.

[0028] In the external spray coating step S6, an external spray coating machine is used to spray a high-temperature protective outer layer 104 onto the entire outer surface of the pot blank 1 obtained in step S5, thereby finally obtaining the cold spray pot with bottom oil collection function, referred to as the "oil collection pot." The protective outer layer 104 can be manufactured by referring to prior art CN201910589481.7.

[0029] Based on the above-mentioned pan manufacturing method, three types of oil collection pan samples with different specifications, Examples 1 to 3, were manufactured. Then, under the conditions of the same specifications and the same coating material, they were compared with a conventional hot composite bottom frying pan and a conventional cold composite bottom frying pan. The test results are shown in Table 1.

[0030] [Table 1]

[0031] Regarding the notes, the above test process was repeated 10 times in the laboratory, and the test data and results were similar.

[0032] As can be seen from this, the patent of the present invention has a great advantage over the prior art. The basic principles, main features and advantages of the present invention have been described above. Those skilled in the art will understand that the present invention is not limited to the above embodiments, and that what has been described in the above embodiments and the specification merely exemplify the principles of the present invention. The present invention may further include various modifications and improvements without departing from the spirit and scope of the present invention, and all such modifications and improvements are included within the scope of the present invention. [Explanation of symbols]

[0033] 1. Pot material 11 Circular boss 12 Arc surface 101 Non-adhesive coating 102 Magnetically conductive coating 103 Anti-rust coating 104 Protective outer layer

Claims

1. S1: In the pot body forming operation, a large-tonnage press is used to form an aluminum alloy sheet material into a pot blank shape, and an annular boss protruding outward is formed on the outer peripheral edge of the outer bottom of the pot blank, and an arcuate surface protruding outward is formed in the bottom center region of the pot blank; In the S2 pretreatment operation, the pot blank obtained in step S1 is subjected to oil removal and internal sand boiling operation to make the inner surface roughness of the pot blank reach Ra2.8 to Ra4.5; S3 In the internal spray coating operation, the non-stick paint is sprayed onto the inner surface of the pot material obtained in step S2 using an internal spray coating device to obtain a non-stick coating film; S4: In the outer bottom spray coating operation, first, use a cold gas spray coating machine to cold spray magnetic powder onto the outer bottom of the pot blank obtained in step S3 to obtain a magnetically conductive coating film; then use an arc spray coating machine to arc spray coat metal aluminum onto the magnetically conductive coating film to obtain an anti-rust coating film; S5: In the external polishing operation, the pot blank obtained in step S4 is polished in a polishing machine to polish the outer wall of the pot blank; S6: In an external spray coating operation, use an external spray coating device to spray a high-temperature protective outer layer onto the outer surface of the entire pot blank obtained in step S5, and finally obtain the cold spray pot with the bottom oil collecting function. A method for manufacturing a cold spray pan with a bottom oil collection function, characterized by the above.

2. The method for manufacturing a cold spray pot with bottom oil collection function as described in claim 1, characterized in that the height H between the center point of the outermost surface of the arc surface and the outer edge of the annular boss is 1.0 to 1.5 mm.

3. The method for manufacturing a cold spray pan with bottom oil collection function as described in claim 1, characterized in that in the oil removal operation, first, sodium hydroxide solution is used to remove grease and oxides from the surface of the pan material, then it is washed with water, and further, diluted nitric acid is used to neutralize it at room temperature, and finally, it is washed with water and dried to obtain a clean pan material.

4. The method for manufacturing a cold spray pan with a bottom oil collection function as described in claim 1, characterized in that in the internal sand-blowing operation, 60 mesh or 80 mesh brown dissolved alumina sand is uniformly sprayed onto the inner surface of the pan blank at an air pressure of 0.6 to 0.7 MPa using a sand-blowing machine, so as to meet the roughness required for internal spray painting.

5. In step S4, the cold spray operation specifically includes the following steps: In the cold gas spray coating equipment, magnetically conductive powder metal particles are accelerated to a critical velocity using an inert compressed gas with a temperature of 800-900°C as an accelerating medium, and the metal particles collide with the outer bottom surface of the pot blank at a supersonic velocity of 800-1000 m / s in a solid state, causing the particles to undergo strong plastic deformation and deposit, thereby forming a magnetically conductive coating film.

6. In step S4, the arc spray coating operation specifically includes the following steps: melting the aluminum wires using an arc generated between two continuously fed aluminum wires by an arc spray coating machine as a heat source, atomizing the molten metal aluminum wires with 0.6-0.7 MPa compressed air, accelerating the atomized metal aluminum droplets, and spraying them onto the outer bottom of the pot blank at a speed of 120-180 m / s to form a single layer of aluminum anti-rust coating film.

7. 2. The method for manufacturing a pot with a bottom oil collecting function using a cold spray, as described in claim 1, characterized in that before performing the cold spray operation in step S4, the outer bottom surface of the pot blank is first subjected to ion beam treatment, and the gas used in the ion beam treatment is a mixture of 15 sccm argon gas and 5 sccm sulfur dioxide, to form a sulfur interface material layer not exceeding five atomic layers thick on the surface of the magnetically conductive coating of the pot blank.

8. The method for manufacturing a cold spray pan with bottom oil collection function as described in claim 1, characterized in that after the cold spray operation in step S4, the magnetic conductive coating surface is further treated with an ion beam, and the gas used in the ion beam treatment is a mixture of 20 sccm argon gas and 10 sccm sulfur dioxide, to form a sulfur interface material layer with a thickness of 5 to 10 atomic layers on the outer bottom surface of the pan material.

9. 2. The method for manufacturing a cold spray pan with bottom oil collection function according to claim 1, wherein in step S6, the protective outer layer can be selected from at least one of high temperature paint, ceramic paint, and anti-stick paint.

10. A cold spray ladle with a bottom oil collecting function, which can be manufactured by the method for manufacturing a cold spray ladle with a bottom oil collecting function according to any one of claims 1 to 9.

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