Manufacturing method of coating-free non-stick pan and coating-free non-stick pan

Abstract

The invention discloses a manufacturing method of an uncoated non-stick pan and the uncoated non-stick pan, and relates to the field of kitchenware, the manufacturing method comprises the following steps: forming a plurality of concave cells on the surface of one side of a metal plate, and forming convex ribs between adjacent cells; manufacturing the metal plate into a pot blank with cells on the inner surface; forming a first hard layer, wherein the first hard layer covers the surfaces of the cells and the side surfaces of the convex ribs; forming a second hard layer, wherein the second hard layer covers the top surface of the convex rib; wherein the hardness of the second hard layer is greater than that of the first hard layer. According to the manufacturing method disclosed by the invention, the cookware has long-term anti-sticking performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kitchen utensils, in particular to a manufacturing method of a non-coated non-stick utensil and the non-coated non-stick utensil. BACKGROUND

[0002] With the improvement of living standards, users have higher and higher requirements for utensils. During cooking, food materials are prone to stick to the surface of the utensil, affecting the appearance of the food materials, and the food materials sticking to the surface of the utensil are also not easy to clean. Therefore, the surface of some utensils is coated with an anti-sticking coating to make the utensil have anti-sticking performance to solve the problem that food materials are prone to stick. However, it has been confirmed that the anti-sticking coating will release toxic substances under the action of high temperature. In order to solve this problem, the surface of some utensils is treated to form a metal oxide layer to achieve anti-sticking.

[0003] Once the metal oxide layer falls off the surface of the utensil, the anti-sticking performance of the utensil will be weakened or even lost, especially on the utensil. During cooking, the spatula will have high-frequency contact, collision and friction with the metal oxide layer on the surface of the utensil when stirring the food materials, and the metal oxide layer is prone to breakage and falling off after a long time of cooking, so that the anti-sticking performance of the local utensil is lost, affecting the cooking effect. The anti-sticking performance of some non-stick pots on the market can only be maintained for 6 to 12 months. SUMMARY

[0004] The present application aims to solve one of the problems in the related art to some extent. To this end, the present application provides a manufacturing method of a non-coated non-stick utensil, which makes the utensil have long-term anti-sticking performance.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: A manufacturing method of a non-coated non-stick utensil, comprising: forming a plurality of recessed cells on one side surface of a metal plate, and forming a protruding rib between adjacent cells; manufacturing a pot blank with the cells on the inner surface from the metal plate; forming a first hard layer covering the surface of the cells and the side surface of the protruding rib; forming a second hard layer covering the top surface of the protruding rib; wherein the hardness of the second hard layer is greater than the hardness of the first hard layer.

[0006] The application discloses a method for producing a pot blank, the main body of the pot blank is made of a metal plate, before the metal plate is made into the pot blank, the metal plate is processed to form a plurality of concave unit cells on the surface of the metal plate, because the metal plate is relatively flat, the plurality of unit cells formed in this way have similar sizes, compared with forming the unit cells after the metal plate is made into the pot blank, forming the unit cells on the metal plate in advance before the pot blank is formed not only makes the unit cells more regular, but also is more convenient and simple. Because the unit cells are spaced from each other, a convex rib protruding from the surface of the unit cell is naturally formed between adjacent unit cells, the convex rib can lift food materials in the cooking process, reduce the contact area between the food materials and the inner surface of the pot, and reduce the food material adhesion probability; the unit cell can store oil in the cooking process, and a uniform oil film can be formed on the inner surface of the pot, further reducing the food material adhesion probability. And in the cooking process, the food materials can be sealed by adhering to the convex rib, and the hot air generated in the unit cell can better hold the food, so as to also reduce the contact area between the food materials and the inner surface of the pot.

[0007] By processing the pot blank, a first hard layer is formed on the surface of the unit cell and the side wall of the convex rib, and a second hard layer is formed on the top surface of the convex rib. The second hard layer has high hardness and can protect the metal on the inner surface of the pot and the first hard layer. In the cooking process, hard food materials such as bones, or the process of stirring food with a spatula or a spoon, or the process of washing the pot with a brush, the second hard layer can block these hard objects to avoid direct contact with the first hard layer and cause damage to the first hard layer, so as to cause the first hard layer to wear, crack, and fall off, and cause the anti-sticking performance of the pot to decrease.

[0008] In addition, the second hard layer has high hardness, so that it can remain intact during a long cooking process, avoiding the exposure of the metal on the surface of the convex rib to affect the anti-sticking performance. The first hard layer is also arranged on the side wall of the convex rib, so that the side wall of the convex rib also has anti-sticking performance and is not easy to stick food materials. Under the protection of the second hard layer, the pot can have long-term anti-sticking performance to ensure the cooking experience and reduce the replacement frequency of the pot.

[0009] Optionally, the first hard layer is formed by: forming an initial hard layer covering the inner surface of the pot blank; removing part of the initial hard layer located on the top surface of the convex rib to obtain the first hard layer.

[0010] Due to the large number of cells and ribs, and the side wall of the rib has at least two faces, if the top surface of the rib is avoided during the process, it will cause the first hard layer to be difficult to generate. And the surface material of the cell and the rib is the same, so a layer of initial hard layer with the same material as the first hard layer can be formed on the inner surface of the pot blank when the first hard layer is generated, so that the surface of the cell and the surface of the rib are covered. The initial hard layer includes the first hard layer and the part of the top surface of the rib, and after the initial hard layer is generated, the part of the initial hard layer on the top surface of the rib is removed, so that the first hard layer covers other parts except the top surface of the rib, thereby increasing the coverage area of the first hard layer on the inner surface of the pot blank. Then the top surface of the rib is processed to form a second hard layer. Because the first hard layer completely covers the side surface of the rib, the second hard layer on the edge of the top surface of the rib can be connected with the first hard layer during the formation of the second hard layer on the top surface of the rib. In this way, the adhesion performance of the two on the inner surface of the pot blank can be simultaneously enhanced, so that they are not easy to fall off. And there is no exposed metal between the two, thereby improving the anti-sticking performance of the pot.

[0011] Optionally, the removing the part of the initial hard layer on the top surface of the rib comprises: placing the pot blank on the rotating platform of the polishing machine; placing the polishing piece in the pot and abutting against the inner surface of the pot blank; the rotating platform drives the pot blank to rotate relative to the polishing piece for a set time length to remove the part of the initial hard layer on the top surface of the rib. Grinding and polishing the inner surface of the pot blank by the polishing machine can remove the part of the initial hard layer on the top surface of the rib. During the grinding and polishing process, the initial hard layer that is not contacted will not be affected. Because the rib is protruding, only the top surface of the rib will be contacted during the grinding and polishing process, and the initial hard layer on the surface of the cell and the side surface of the rib will not be removed, thereby obtaining the first hard layer covering the surface of the cell and the side surface of the rib.

[0012] Optionally, the metal plate material comprises a base material layer and a surface layer, the surface layer is made of titanium metal, the cell and the rib are formed on the surface layer, and the forming the initial hard layer covering the inner surface of the pot blank comprises: forming the initial hard layer by micro-arc oxidation, the material of the initial hard layer is titanium oxide, and the thickness of the initial hard layer is between 15 μm and 50 μm.

[0013] Optionally, the first hard layer has a plurality of pores, and at least part of the pores are interconnected. The pores can store oil and air, and the oil and air in the pores expand during cooking, thereby improving the anti-sticking performance.

[0014] Optionally, the manufacturing method further comprises: The auxiliary treatment is performed on the pot blank to increase the surface roughness of the inner surface of the pot blank. The auxiliary treatment is performed after the metal plate is made into the pot blank.

[0015] The auxiliary treatment is performed on the pot blank to increase the surface roughness of the inner surface of the pot blank. The greater the surface roughness of the inner surface of the pot blank, the stronger the adhesion of the first hard layer on the inner surface of the pot blank when the first hard layer is formed, so that the first hard layer is not easy to fall off.

[0016] Optionally, the auxiliary treatment is sandblasting treatment, which comprises: The pot blank formed with the first hard layer is placed in a sandblasting device, and sandblasting is started; Periodically collect images of the inner surface of the pot blank; Identify the collected images to obtain the surface state of the inner surface of the pot blank and detect the surface roughness; After the surface roughness reaches a preset value, stop sandblasting.

[0017] Optionally, the metal plate comprises a base layer and a surface layer, the surface layer is made of titanium metal, the unit cells and the ribs are formed on the surface layer, and the second hard layer is formed by laser nitriding. The second hard layer is formed by laser nitriding, the material of the second hard layer is titanium nitride, and the thickness of the second hard layer is between 10 μm and 50 μm. Laser nitriding is a method of introducing nitrogen elements on the metal surface by high energy density of laser to form a high-performance nitride hard layer. The moving path and irradiation range of the laser can be controlled, so that the laser can be accurately controlled on the top surface of the rib by laser nitriding without irradiating on the first hard layer. In this way, the second hard layer can be formed on the basis of the formed first hard layer.

[0018] Optionally, the second hard layer is formed by laser nitriding, which comprises: Collect images of the inner surface of the pot blank by an image acquisition system; Use image processing software to analyze the collected images and identify the ribs; According to the identification result, calculate the path of laser nitriding and fit the shape of the top surface of the rib in the control software; Scan the top surface of the rib by the laser head.

[0019] Furthermore, the present application also provides a non-coated non-stick cookware, which comprises a cookware body, an inner surface of the cookware body is shaped with a plurality of polygonal anti-sticking units, the plurality of anti-sticking units are distributed on at least a portion of the inner surface of the cookware body in a mutually abutting state, the anti-sticking unit comprises a protruding rib protruding from the inner surface of the cookware body and a unit cell surrounded by the protruding rib, a surface of the unit cell and a sidewall of the protruding rib are provided with a first hard layer, a top surface of the protruding rib is provided with a second hard layer, the second hard layer has a hardness greater than that of the first hard layer, and the non-coated non-stick cookware is formed by using the above manufacturing method to form the first hard layer and the second hard layer.

[0020] The non-coated non-stick cookware disclosed by the present application has anti-sticking units, the anti-sticking units comprise protruding ribs and unit cells, a surface of the unit cell and a sidewall of the protruding rib are provided with a first hard layer, a top surface of the protruding rib is provided with a second hard layer, and the anti-sticking units are shaped on the cookware blank by using the above manufacturing method, so that the cookware has long-term anti-sticking performance. The reasoning process of this beneficial effect is similar to that of the above manufacturing method, and will not be described here again.

[0021] The features and advantages of the present application will be described in detail in the following specific embodiments and drawings. The best mode or means of the present application will be fully described in conjunction with the drawings, but it is not a limitation on the technical solutions of the present application. In addition, the features, elements and components appearing in each of the following text and drawings are multiple, and different symbols or numbers are marked for convenience of representation, but all represent the same or similar structure or function parts. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the drawings: Figure 1 A flowchart of the manufacturing method in the present application; Figure 2 A structural schematic diagram of the cookware blank in the present application; Figure 3 A sectional view of the unit cell and the protruding rib in the present application; Figure 4 A partial top view of the inner surface of the cookware in the present application; Figure 5 A flowchart of the manufacturing method in the present application; Figure 6 An enlarged view of the first hard layer in the present application; Figure 7 Detailed steps of the manufacturing method in the present application; Figure 8 A partial schematic diagram of the inner surface of the cookware in the present application; Figure 9 A sectional view of the first hard layer in the present application; Figure 10This is a front view of the first hard layer in this invention.

[0023] Figure label: Cell 100, Rib 110; First hard layer 200, second hard layer 210, pores 220; Substrate layer 300, surface layer 310. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain the present invention and should not be construed as limiting the invention.

[0025] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this invention. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0026] Reference Figures 1 to 10 This invention discloses a method for manufacturing uncoated non-stick cookware, the method comprising the following steps: S10, multiple recessed cells 100 are formed on one side surface of the metal sheet, and raised ribs 110 are formed between adjacent cells 100; S20, a metal sheet is machined into a pot blank with 100 cells on the inner surface; S30, the inner surface of the pot blank is processed by the first process to form a first hard layer 200, the first hard layer 200 covering the surface of the cell 100 and the side of the rib 110. S40, the inner surface of the pot blank is treated by a second process to form a second hard layer 210, and the second hard layer 210 covers the top surface of the rib 110. The second hard layer 210 has a higher hardness than the first hard layer 200.

[0027] The method is a manufacturing method of a metal cooking utensil, and a base material of the cooking utensil is a metal plate. A first step S10 of the method is a pretreatment of the metal plate. In step S10, before the metal plate is manufactured into a cooking blank, the metal plate is treated to form a plurality of concave unit cells 100 and a plurality of convex ribs 110 between adjacent unit cells 100 on the surface of the metal plate. Because the metal plate is relatively flat, the plurality of unit cells 100 and the plurality of convex ribs 110 formed in this way have similar sizes. In step S20, the treated metal plate is machined into a cooking blank by mechanical processing. During the machining process, it is necessary to ensure that one side of the metal plate with the unit cells 100 is the inner surface of the cooking blank.

[0028] Compared with forming the unit cells 100 on the metal plate after the metal plate is manufactured into a cooking blank, forming the unit cells 100 on the metal plate before the cooking blank is formed not only makes the unit cells 100 more regular, but also is more convenient and simple. Because the unit cells 100 are spaced apart from each other, the convex ribs 110 protruding from the surfaces of the unit cells 100 are naturally formed between adjacent unit cells 100. The convex ribs 110 can hold food during cooking, reduce the contact area between the food and the inner surface of the cooking utensil, and reduce the probability of food sticking. The unit cells 100 can store oil during cooking, and a uniform oil film can be formed on the inner surface of the cooking utensil, further reducing the probability of food sticking. During cooking, the food can adhere to the convex ribs 110, sealing the unit cells 100, and the hot air generated in the unit cells 100 can better hold the food, thus reducing the contact area between the food and the inner surface of the cooking utensil. The metal plate is machined by mechanical processing, which does not damage the unit cells 100 and the convex ribs 110. Therefore, the inner surface of the cooking blank has complete unit cells 100 and convex ribs 110, so that the inner surface of the cooking blank is composed of a plurality of adjacent anti-sticking units through the unit cells 100 and the convex ribs 110.

[0029] However, even if the anti-sticking unit has certain anti-sticking effect, the metal is still easy to cause food materials to stick together, so that the top surface of the convex rib 110 will adhere to food residue. Therefore, the pot blank is sequentially processed through the first process and the second process, respectively forming the first hard layer 200 on the surface of the unit cell 100 and the second hard layer 210 on the top surface of the convex rib 110, and the first hard layer 200 and the second hard layer 210 both have anti-sticking effect better than metal, and in combination with the anti-sticking effect of the anti-sticking unit described above, the pot has excellent anti-sticking effect. The second hard layer 210 has a higher hardness and a hardness higher than that of the first hard layer 200, which can protect the metal on the inner surface of the pot blank and the first hard layer 200. During cooking, such as hard food materials like bones, or during the process of stirring food with a spatula or spoon, or during the process of washing the pot with a brush, the second hard layer 210 can block these hard objects to avoid direct contact with the first hard layer 200, which can cause damage to the first hard layer 200, causing the first hard layer 200 to wear, crack, and fall off, resulting in a decrease in the anti-sticking performance of the pot.

[0030] In addition, the high hardness of the second hard layer 210 enables it to remain intact during long-term cooking, avoiding exposure of the metal on the surface of the convex rib 110 to affect the anti-sticking performance. Under the protection of the second hard layer 210, the pot can have long-term anti-sticking performance to ensure the cooking experience and reduce the frequency of replacing the pot.

[0031] The first hard layer 200 and the second hard layer 210 are both metal compounds formed by chemical reaction of the metal on the surface of the metal plate, so that the first hard layer 200 and the second hard layer 210 can be tightly combined with the metal plate, making them not easy to fall off from the inner surface of the pot blank.

[0032] Based on the above scheme, in an embodiment of the present application, specifically, in step S10, the metal plate is formed into a unit cell 100 by embossing, the depth of the unit cell 100 is not more than 0.5mm, and the width of the convex rib 110 is not more than 0.6mm.

[0033] Embossing is a kind of processing technology which uses the ductility of metal to make the surface of the metal permanently deformed by extrusion with external force, thereby forming a raised or recessed pattern. Through the way of embossing, a plurality of unit cells 100 and ribs 110 with substantially consistent shape and size can be formed stably and simultaneously, and the production efficiency is high. It should be noted that one side of the metal plate is not formed with unit cells 100 and ribs 110 on the front surface, but only in part of the area, so that the bottom surface of the formed pot blank and part of the side surface connected to the bottom surface have anti-sticking units. The part near the upper end edge of the pot blank does not need to be specially provided with anti-sticking units because it is rarely in contact with food. In this way, the reasonable arrangement of anti-sticking units makes the pot have both anti-sticking function and low production cost, and forms two different areas on the inner surface of the pot, which can make the appearance more beautiful.

[0034] In this application, embossing is performed on the metal plate with a pressure of 4000 tons to 8000 tons, and the specific pressure is determined according to the size of the specification. Then, the mold can be opened to form the unit cells after 3 to 7 seconds.

[0035] The ribs 110 serve to support the food and reduce the contact area between the food and the inner surface of the pot. The thickness D of the ribs 110 is set to be not more than 0.6 mm to avoid the ribs 110 being too thick, which reduces the size of the unit cells 100 and the anti-sticking performance of the pot, and also avoids the contact area between the food and the pot being too large, which affects the anti-sticking effect. The ribs 110 protrude to form unit cells 100 that can store oil to prevent sticking. The height H1 of the ribs 110 protruding from the surface of the unit cells 100 is set to be not more than 0.5 mm to avoid the volume of the unit cells 100 being too large, which affects cooking and cleaning.

[0036] Preferably, the thickness D of the ribs 110 is within 0.5 mm, such as 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm.

[0037] Preferably, the height H1 of the ribs 110 protruding from the surface of the unit cells 100 is 0.05 mm to 0.4 mm, such as 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm.

[0038] By designing the embossing mold, the shape of the anti-sticking unit is polygonal, which can arrange and splice multiple anti-sticking units in a more regular manner. The regular anti-sticking units can disperse stress through close connection between each other when heated or cooled to improve the overall rigidity of the pot body. At the same time, the anti-sticking units are not easy to deform when contacting hard objects during cooking and washing.

[0039] Of course, in addition to using the embossing method, the unit cells or ribs can also be formed by etching or CNC fine carving cutting processing.

[0040] As shown in Figure 8 , by designing the embossing mold, the side of the rib 110 can be made into an inclined surface. The anti-sticking unit formed in this way has a structure in which the cross-section gradually increases from bottom to top, which can reduce the possibility of the unit cell 100 being stuck by food and forming a blockage or being difficult to clean the pot body. By designing the side wall of the rib 110 as an inclined structure, the thickness of the rib 110 can be reduced as much as possible while keeping the surface size of the unit cell 100 unchanged, reducing the proportion of the top surface area of the rib 110 in the total area of the anti-sticking unit, so as to reduce the area of the second hard layer 210 and reduce the contact area between the food and the inner surface of the pot. In this way, without affecting the protective effect of the second hard layer 210 on the first hard layer 200, the coverage area of the first hard layer 200 is increased, and the anti-sticking performance of the pot is improved.

[0041] Preferably, the angle between the side wall of the rib 110 and the surface of the unit cell 100 is not less than 120°, so that the side wall of the rib 110 has a greater inclination, and the food is better prevented from blocking the anti-sticking unit, facilitating cleaning.

[0042] When the angle between the side wall of the rib 110 and the surface of the unit cell 100 is ≥120°, in order to maintain the depth of the unit cell 100 and ensure that the rib 110 has a certain thickness and avoid the size of the unit cell 100 being too large, the size of the surface of the unit cell 100 will need to be reduced. The structure is shown in Figure 8 , compared with Figure 4 , it can be seen that Figure 8 , the surface size of the unit cell 100 is reduced.

[0043] Referring to Figures 1 to 5 , based on the above embodiment, in an embodiment of the present application, the first process forms the first hard layer 200 on the surface of the unit cell 100 and the surface of the rib 110, and the manufacturing method further comprises: S31, forming an initial hard layer covering the inner surface of the pot blank; S32, removing the part of the initial hard layer located on the top surface of the rib 110 to obtain the first hard layer 200.

[0044] The initial hard layer includes the first hard layer 200 and the part of the top surface of the rib 110. The material of the surface of the rib 110 and the material of the surface of the unit cell 100 are the same, so that the material of the initial hard layer formed is the same as the material of the first hard layer 200.

[0045] The anti-sticking unit comprises a unit cell 100 and a protrusion 110 surrounding the unit cell 100, and adjacent unit cells 100 share the same protrusion 110, which can reduce the area of the protrusion 110 on the inner surface of the wok blank to further reduce the contact area of the food with the inner surface of the wok blank during cooking. Since the anti-sticking units are arranged in a matrix on the inner surface of the wok blank, the number is large, and each protrusion 110 has two surfaces that need to be formed with a first hard layer 200. If the top surface of the protrusion 110 is avoided during the implementation of the first process, it will result in a large difficulty and long implementation time of the first process. Therefore, during the implementation of the first process, all unit cells 100 and protrusions 110 are covered, and after the completion of the first process, the unit cells 100 and the protrusions 110 are covered with an initial hard layer. After the initial hard layer is generated, part of the initial hard layer on the top surface of the protrusion 110 is removed, so that the first hard layer 200 covers other parts except the top surface of the protrusion 110, which increases the coverage area of the first hard layer 200 on the inner surface of the wok blank and has better anti-sticking performance.

[0046] Since the removal process only removes the initial hard layer on the top surface of the protrusion 110, the first hard layer 200 completely covers the side surface of the protrusion 110, which maximizes the coverage area of the first hard layer 200 on the inner surface of the wok blank. During the formation of the second hard layer 210 on the top surface of the protrusion 110, the second hard layer 210 on the edge of the top surface of the protrusion 110 can be connected with the first hard layer 200, which can simultaneously enhance the adhesion performance of the two on the inner surface of the wok blank and make them not easy to fall off. There is no exposed metal between the first hard layer 200 and the second hard layer 210, which improves the anti-sticking performance of the cookware.

[0047] The first process is micro-arc oxidation, which is a surface treatment technology that grows a high-performance ceramic oxide film on the surface of a metal (mainly aluminum, magnesium, titanium and their alloys) by high-voltage electric field excitation micro-arc discharge. Since the top surface of the protrusion 110 does not need to be avoided during the implementation process, the first process only needs to control the thickness of the initial hard layer during the implementation process.

[0048] The metal plate comprises a base material layer 300, an intermediate layer 301 and a surface layer 310. The base material layer 300 can be a single metal layer or an alloy layer or composed of multiple layers of metal. The surface layer 310 is made of titanium metal, and the unit cell 100 and the protrusion 110 are formed on the surface layer 310. Titanium metal has excellent performance, but its price is also very high. The intermediate layer 301 usually uses metal materials with good thermal conductivity, such as pure aluminum plate or copper plate. The base material layer 300 of the metal plate can be made of low-cost metal, and the surface for cooking is made of titanium metal, which can reduce the cost while ensuring the performance of the cookware.

[0049] The first hard layer 200 is a titanium oxide with a thickness H2 of 15μm to 50μm and a hardness of not less than 500HV. If the thickness of the first hard layer 200 is less than 15μm, the cookware will have weak non-stick properties due to insufficient thickness; if the thickness of the first hard layer 200 exceeds 50μm, the increase in the thickness of the first hard layer 200 will not significantly enhance the non-stick properties, and will also increase material consumption and prolong the processing time of the pot blank. Therefore, setting the thickness of the first hard layer 200 to 15μm to 50μm is more appropriate.

[0050] Preferably, the thickness H2 of the first hard layer 200 is 20μm to 40μm, for example, 20μm, 25μm, 30μm, 35μm, or 40μm.

[0051] The specific steps of step S31 are as follows: An initial hard layer is formed by micro-arc oxidation. The material of the initial hard layer is titanium oxide, and the thickness of the initial hard layer is between 15 μm and 50 μm, preferably between 20 μm and 40 μm.

[0052] The execution parameters for micro-arc oxidation are: The current is 1A / dm 2 ~3A / dm 2 The voltage is 450V / dm 2 ~550V / dm 2 The oxidation time is 25 to 40 minutes.

[0053] Reference Figures 1 to 5 Based on the above embodiments, in one embodiment of the present invention, step S32, removing the portion of the initial hard layer located on the top surface of the rib 110, includes: S321, Place the pot blank on the rotating platform of the polishing machine; S322, Place the polished part inside the pot and make it fit against the inner surface of the pot blank; S323, the rotating platform drives the pot blank to rotate relative to the polished part for a set time to remove the part of the initial hard layer located on the top surface of the rib 110.

[0054] The polishing components include a polishing wheel and a polishing pad. The polishing wheel applies pressure to the polishing pad so that the polishing pad adheres to the inner surface of the pot blank.

[0055] The inner surface of the pot blank is ground and polished by a polishing machine to remove part of the initial hard layer on the top surface of the convex rib 110. The grinding and polishing is a mechanical process, which does not affect the initial hard layer that is not contacted during the implementation process. Because the convex rib 110 is convex, only the top surface of the convex rib 110 is contacted during the grinding and polishing process, and the initial hard layer on the surface of the unit cell 100 and the side surface of the convex rib 110 is not removed, so that the initial hard layer on the top surface of the convex rib 110 can be accurately removed, and the first hard layer 200 covering the surface of the unit cell 100 and the side surface of the convex rib 110 is obtained.

[0056] The length of time for the rotation of the rotating platform is set according to the thickness of the first hard layer 200.

[0057] Steps S322 and S323 need to be executed reciprocatingly for multiple times: When executed for the first time, 80-180 mesh gauze is used for rough sanding; When executed for the second time, 320-400 mesh gauze is selected for fine sanding; When executed for the third time, 400-600 mesh gauze is selected for fine sanding; When executed for the fourth time, a scouring pad is selected for fine sanding; When executed for the last time, a cotton wheel or a wool wheel is selected for fine polishing.

[0058] After multiple polishing, the roughness of the top surface of the convex rib 110 can reach Ra0.2-0.6, so that after the second process, the second hard layer 210 with small surface roughness can be formed, and the friction coefficient between the steel shovel and the second hard layer 210 during frying is reduced, and the frying shovel is more smooth, and the experience is good.

[0059] Preferably, after the second process is implemented, the cotton wheel or the wool wheel is used for once again rapid fine polishing, so as to ensure that the surface roughness value of the second hard layer 210 is reduced while the second hard layer 210 is avoided to be removed. The fine polishing adopts polishing powder with a particle size of 1-2 μm, and the polishing time is 30-90 s, so that the surface roughness Ra≤0.3.

[0060] In step S323, the position of the polishing piece needs to be adjusted constantly during the grinding process, so that the convex rib 110 on the bottom surface and the side surface of the pot blank can be polished. Because the polishing piece is relatively soft, it can deform to adapt to the shapes of the inner surfaces of the pot blanks of various specifications.

[0061] In step S322, a hard grinding mold can also be placed in the pot blank according to the size specification of the pot blank. The shape of the grinding mold is customized according to the shape of the pot blank, and the grinding mold can be attached to the inner surface of the pot blank.

[0062] In addition, the pot blank can be polished by a sand polishing machine. The sand polishing machine is a device for treating the surface of an object by high-speed spraying of abrasive materials, and has high polishing efficiency. By adjusting the abrasive materials, spraying pressure and other parameters, the surface roughness of the polished surface can be controlled.

[0063] Referring to Figures 1 to 7 Based on the above embodiments, in one embodiment of the present application, the second process is laser nitriding, and the second hard layer 210 is titanium nitride with a thickness H3 of 10-50 μm. Laser nitriding is a process of introducing nitrogen elements on the surface of a metal by high energy density of laser to form a high-performance nitride hard layer. The moving path, moving speed, focal length, frequency and irradiation range of the laser can be controlled by software. The laser can be accurately controlled on the top surface of the rib 110 by visual recognition and signal transmission to the laser controller for operation, and will not irradiate the first hard layer 200. Thus, the second hard layer 210 can be formed on the basis of the first hard layer 200 which has been formed. The hardness of the second hard layer 210 is not less than 800 HV, and the initial hardness of the metal titanium is only 100-150 HV.

[0064] Preferably, the thickness H3 of the second hard layer 210 is 10-30 μm, for example, 10 μm, 15 μm, 20 μm, 25 μm or 30 μm.

[0065] The step S40 specifically includes the following steps: The second hard layer 210 is formed by laser nitriding. The material of the second hard layer 210 is titanium nitride, and the thickness of the second hard layer 210 is 10-30 μm, preferably 10-20 μm.

[0066] The step S40 includes the following steps: S41, acquiring the image of the inner surface of the pot blank by an image acquisition system; S42, analyzing the acquired image by using image processing software to identify the rib 110; S43, according to the identification result, calculating the path of laser nitriding and fitting the shape of the top surface of the rib 110 in the control software; S44, scanning and nitriding the top surface of the rib 110 by using the laser head.

[0067] The execution parameters of the laser head are as follows: The power is 800-1500 W, the scanning speed is 0.8-1 mm / s, and the scanning width is 0.1-0.3 mm. The hardening material of high-hardness TiN phase is formed.

[0068] The execution parameters of the laser head are adjusted according to the size of the convex ribs 110 and the thickness requirement of the second hard layer 210, and the parameters include power density, scanning speed, scanning width, frequency, focal length, spot width, and temperature, etc.

[0069] After step S32, the convex rib 110 top surface is polished to have a surface roughness between Ra0.2-0.6, so that the convex rib 110 top surface is relatively smooth and bright, so that the convex rib 110 top surface is more obvious on the image collected by the image acquisition system, and the image processing software can more accurately identify the convex rib 110 top surface, thereby improving the precision of laser nitriding.

[0070] Referring to Figures 1 to 7 , based on the above embodiment, in an embodiment of the present application, the first hard layer 200 has a plurality of pores 220, and at least part of the pores 220 are interconnected.

[0071] The pores 220 are microstructures, and food particles cannot enter the pores 220 and remain inside during cooking.

[0072] As shown in Figure 9 and Figure 10 , Figure 9 and Figure 10 are images of the first hard layer 200 under an electron microscope, Figure 9 is a sectional view, and it can be seen that the first hard layer 200 has a plurality of pores, and part of the pores are connected to form larger pores. Figure 10 is a micrograph of the surface of the first hard layer 200, and it can be seen that there are many micropores on the surface, i.e. the openings of the pores.

[0073] The initial hard layer formed by micro-arc oxidation has a large number of micro-nano pores (i.e. the pores 220 described above), and the micro-nano pores can store oil and air, and the oil and air in the micro-nano pores expand under heat during cooking, thereby improving the anti-sticking performance.

[0074] Referring to Figures 1 to 7 , based on the above embodiment, in an embodiment of the present application, the manufacturing method further comprises: S201, auxiliary treatment is performed on the pot blank to increase the surface roughness of the inner surface of the pot blank.

[0075] The surface roughness of the inner surface of the pot blank is increased by auxiliary treatment, and the greater the surface roughness of the inner surface of the pot blank, the stronger the adhesion of the first hard layer 200 on the inner surface of the pot blank, so that the first hard layer 200 is not easily detached.

[0076] The auxiliary treatment is sandblasting treatment, which comprises the following steps: S2011, the pot blank is placed in a sandblasting device, and sandblasting is started; S2012, collect the image of the inner surface of the pot blank; S2013, identify the collected image to detect the surface roughness; S2014, whether the surface roughness reaches the preset value, if not, return to step S2012, if yes, execute step S31.

[0077] The surface roughness preset value is between Ra1.0 and Ra2.5, and the preferred value is Ra1.6.

[0078] The execution parameters of the sand blasting process are: The working pressure is 0.4-0.7 MPa, the sand blasting flow rate is 0.5-1.2 L / min, and the sand blasting particle size is 12-25 μm.

[0079] The execution parameters of the sand blasting process are selected according to various factors such as the thickness and hardness of the initial hard layer.

[0080] During the sand blasting process, small particles are sprayed at high speed towards the inner surface of the pot blank, and the small particles have a large speed and can polish the inner surface of the pot blank to improve the surface roughness of the inner surface of the pot blank.

[0081] Referring to Figure 7 , in combination with all the above embodiments, the manufacturing method of the present application has the following specific steps: S10, forming a plurality of concave cells 100 on one side surface of a metal plate, and forming a convex rib 110 between adjacent cells 100; S20, machining the metal plate into a pot blank with the inner surface having the cells 100; S2011, placing the pot blank in a sand blasting device and starting sand blasting; S2012, collecting the image of the inner surface of the pot blank; S2013, identifying the collected image to detect the surface roughness; S2014, whether the surface roughness reaches the preset value, if not, return to step S2012, if yes, execute step S31; S31, treating the inner surface of the pot blank by micro-arc oxidation to form an initial hard layer (i.e. titanium oxide layer, covering the surfaces of the cells 100 and the convex ribs 110) covering the inner surface of the pot blank; S321, placing the pot blank on the rotating platform of a polishing machine; S322, placing the polishing piece in the pot and adhering it to the inner surface of the pot blank; S323, rotating the platform to rotate the pot blank relative to the polishing piece for a set period of time, and the polishing piece polishes the pot blank to remove the part of the initial hard layer located on the top surface of the convex rib 110, to obtain a first hard layer 200. S41, the pot blank is transferred to the laser equipment, and an image of the inner surface of the pot blank is collected through an image collection system; S42, the collected image is analyzed using image processing software, and the convex rib 110 is visually recognized; S43, according to the result of visual recognition, the path of laser nitriding is calculated and the shape of the top surface of the convex rib 110 is fitted in the control software; S44, the convex rib 110 top surface is scanned by the laser head for nitriding, and a titanium nitride layer (i.e., a second hard layer 210) is formed on the top surface of the convex rib 110.

[0082] With reference to Figures 1 to 8 The present application also provides a non-coated non-stick pot, comprising a pot body, the inner surface of the pot body is formed with a plurality of polygonal anti-sticking units, the plurality of anti-sticking units are distributed in a mutually adjacent state on at least a portion of the inner surface of the pot body, the anti-sticking unit comprises a convex rib 110 protruding from the inner surface of the pot body and a unit cell 100 surrounded by the convex rib 110, the surface of the unit cell 100 and the side wall of the convex rib 110 are provided with a first hard layer 200, the top surface of the convex rib 110 is provided with a second hard layer 210, the hardness of the second hard layer 210 is greater than the hardness of the first hard layer 200, the side wall of the convex rib 110 is inclined, the included angle between the side wall of the convex rib 110 and the surface of the unit cell 100 adjacent thereto is greater than 90°, the area of the second hard layer 210 accounts for 5% to 10% of the total area of the anti-sticking unit, and the non-coated non-stick pot adopts the above manufacturing method to form the first hard layer 200 and the second hard layer 210.

[0083] The non-coated non-stick pot disclosed by the present application has an anti-sticking unit, the anti-sticking unit comprises a convex rib 110 and a unit cell 100, the surface of the unit cell 100 and the side of the convex rib 110 are provided with a first hard layer 200, the top surface of the convex rib 110 is provided with a second hard layer 210, and the anti-sticking unit is formed on the pot blank by the above manufacturing method, so that the pot has long-term anti-sticking performance, and the reasoning process of this beneficial effect is similar to the above manufacturing method, which will not be described here.

[0084] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art should understand that the present application includes but is not limited to the contents described in the above specific embodiments and the drawings. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A method of manufacturing a non-coated non-stick cookware, characterized in that, The method comprises the following steps: forming a plurality of concave cells (100) on one side surface of a metal plate, and forming a convex rib (110) between adjacent cells (100); manufacturing a pot blank with an inner surface having the cells (100); forming a first hard layer (200) covering the surface of the cells (100) and the side surface of the convex rib (110); forming a second hard layer (210) covering the top surface of the convex rib (110); wherein the hardness of the second hard layer (210) is greater than the hardness of the first hard layer (200).

2. The production method according to claim 1, characterized by The forming of the first hard layer (200) comprises: forming an initial hard layer covering the inner surface of the pot blank; removing the part of the initial hard layer on the top surface of the convex rib (110) to obtain the first hard layer (200).

3. The production method according to claim 2, characterized by The removing of the part of the initial hard layer on the top surface of the convex rib (110) comprises: placing the pot blank on a rotating platform of a polishing machine; placing a polishing piece in the pot and making it adhere to the inner surface of the pot blank; rotating the pot blank relative to the polishing piece for a certain period of time to remove the part of the initial hard layer on the top surface of the convex rib (110).

4. The production method according to claim 2, characterized by The metal plate comprises a base layer (300) and a surface layer (310), the surface layer (310) is made of titanium metal, the cells (100) and the convex rib (110) are formed on the surface layer (310), and the forming of the initial hard layer covering the inner surface of the pot blank comprises: forming the initial hard layer by micro-arc oxidation, the material of the initial hard layer is titanium oxide, and the thickness of the initial hard layer is between 15 μm and 50 μm.

5. The production method according to claim 1, wherein The first hard layer (200) has a plurality of pores (220), and at least part of the pores (220) are interconnected.

6. The production method according to any one of claims 1 to 5, characterized by, The manufacturing method further comprises: performing auxiliary treatment on the pot blank to increase the surface roughness of the inner surface of the pot blank; wherein the auxiliary treatment is performed after the metal plate is manufactured into the pot blank.

7. The production method according to claim 6, wherein The auxiliary treatment is sand blasting treatment, which comprises: placing the pot blank in a sand blasting device and starting sand blasting; periodically collecting images of the inner surface of the pot blank; identifying the collected images to obtain the surface state of the inner surface of the pot blank and detect the surface roughness; stopping sand blasting when the surface roughness reaches a preset value.

8. The production method according to any one of claims 1 to 5, characterized by, The metal plate comprises a base layer (300) and a surface layer (310), the surface layer (310) is made of titanium metal, the cells (100) and the convex rib (110) are formed on the surface layer (310), and the forming of the second hard layer (210) comprises: forming the second hard layer (210) by laser nitriding, the material of the second hard layer (210) is titanium nitride, and the thickness of the second hard layer (210) is between 10 μm and 50 μm.

9. The production method according to claim 8, wherein The forming of the second hard layer (210) by laser nitriding comprises: collecting images of the inner surface of the pot blank by an image collection system; An image processing software is used to analyze the collected images and identify the convex ribs (110); According to the identification result, the path of laser nitriding is calculated and the shape of the top surface of the convex rib (110) is fitted in the control software; The top surface of the convex rib (110) is scanned by the laser head to obtain the second hard layer (210).

10. A non-coated non-stick cookware characterized in that, The pot body is provided with a plurality of polygonal anti-sticking units on the inner surface, which are distributed in an adjacent state on at least a part of the inner surface of the pot body. The anti-sticking unit comprises a convex rib (110) protruding from the inner surface of the pot body and a unit cell (100) surrounded by the convex rib (110). The surface of the unit cell (100) and the side wall of the convex rib (110) are provided with a first hard layer (200), the top surface of the convex rib (110) is provided with a second hard layer (210), the hardness of the second hard layer (210) is greater than that of the first hard layer (200), and the side wall of the convex rib (110) is inclined. The non-coated non-stick pot is formed by the manufacturing method of any one of claims 1 to 9 to form the first hard layer (200) and the second hard layer (210).

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