Pot processing method

Abstract

The invention discloses a cookware processing method based on a spinning device, the spinning device comprises a spinning roller, an upper die and a lower die, the lower die is provided with an outer convex surface matched with the inner surface profile of a cookware, and the outer convex surface is provided with concave-convex first lines; the processing method comprises the steps that S1, a base material is made into sheet-shaped material sheets; s2, the material piece is clamped and fixed through an upper die and a lower die, the upper die and the lower die drive the material piece to rotate, in the rotating process of the material piece, a spinning roller presses the material piece into a pot blank wrapping the outer convex face of the lower die, the pot blank extrudes the first lines through the spinning roller, and the pot blank is pressed into the second lines through the spinning roller; and extruding the first lines on the inner surface of the pot blank to form second lines. According to the cookware processed through the cookware processing method, the concave-convex lines on the inner surface of the cookware are more obvious and clear, the anti-sticking performance of the cookware is greatly improved, the process is simple, the cost is low, and the yield of the finished cookware is increased.

Description

Technical Field

[0001] This application relates to the technical field of kitchen cookware, and particularly to a method for processing cookware. Background Art

[0002] Food sticking to the pan is a problem that many consumers have been facing during the use of cookware. Sticking will lead to a particularly poor experience in using the cookware. In order to increase the non-stick property of the cookware, many cookware manufacturers will adopt special treatment on the inner surface of the cookware, mainly by adding a non-stick coating. However, most consumers have doubts about the health and safety factor of the non-stick coating of the cookware. Especially for some inferior coatings, they are prone to shedding and releasing harmful substances, posing a relatively high carcinogenic risk. There are also some cookware that will perform processing texture treatment on the inner surface of the pot blank during the processing. The texture can be, for example, a hammer texture, an etched texture, etc. Cookware with texture has a better non-stick effect compared to flat cookware, and the texture will not fall off, overcoming the problems of easy shedding and release of harmful substances of the non-stick coating.

[0003] Cookware is mainly processed from a metal substrate into a pot blank, and then the pot blank is processed into cookware. The forming processes of the pot blank mainly include stretching, die-casting, and spinning, etc. Among them, the advantage of the spinning process is mainly that it can produce cookware with different wall thicknesses in different regions, and compared with the die-casting process, the spinning process has lower requirements for equipment. The general process of the cookware spinning process is: fixing a flat or hollow blank on the punch of the spinning device. While the blank rotates with the mold, applying pressure to the blank with a spinning roller or roller shaft to make it plastically bend and deform to form a pot blank covering the punch, and then forming the pot blank into cookware through a series of physical and chemical treatments.

[0004] However, when using the spinning process to produce cookware with texture, since the spinning roller will apply a very large pressure to the blank, and at the same time the blank will also be extruded with the punch, the depth of the texture will become shallower under the action of the extrusion force on both sides, resulting in the texture becoming unclear or even losing the non-stick effect. Although the texture can be processed on the pot blank after it is formed into a pot blank, since the shape of the pot blank is a sheet-like arc shape, in order to maintain the shape of the pot blank, the design of the forming mold for processing the texture is more difficult, and at the same time it also tests the proficiency level of the producer in operating the mold. If the producer operates improperly, it is easy to cause the pot shape to change and affect the finished product rate. Summary of the Invention

[0005] This application provides a method for processing cookware to improve or solve the technical problem that the texture is easily flattened when processing cookware with texture by the spinning process.

[0006] The technical solution adopted in this application is as follows:

[0007] A method for processing a cookware is based on a spinning device, the spinning device comprising a spinning roller, an upper die and a lower die, the lower die being provided with an outer convex surface adapted to the inner surface contour of the cookware, the outer convex surface being provided with a first concave-convex texture; the processing method comprising: step S1, making a substrate into a sheet-shaped material sheet; step S2, clamping and fixing the material sheet by an upper die and a lower die, so that the upper die and the lower die drive the material sheet to rotate, during the rotation of the material sheet, the spinning roller presses the material sheet into a pot embryo covered on the outer convex surface of the lower die, and the spinning roller extrude the first texture on the pot embryo, so that the first texture is extruded to form a second texture on the inner surface of the pot embryo.

[0008] In the technical solution, a first texture is arranged on the outer convex surface of the lower mold. In the processing method, a spinning roller extrude the first texture on the pot embryo, so that the first texture is extruded to form a second texture on the inner surface of the pot embryo. Since the first texture is concave-convex, the second texture extruded on the inner surface of the pot embryo is also concave-convex, thereby adding a non-stick effect to the pot. In a preferred embodiment, the first texture can be designed as a hammer pattern, on this basis, the second texture extruded on the inner surface of the pot embryo by the first texture is also a hammer pattern. More importantly, the clarity of the second texture is positively correlated with the extrusion force exerted by the spinning roller on the sheet. In other words, during the pot embryo forming process, as the extrusion force exerted by the spinning roller on the sheet increases, the sheet is wrapped around the outer convex surface of the punch with greater adhesion, and the second texture formed by the first texture of the lower die on the inner surface of the pot embryo by extrusion will be clearer and more obvious, thereby effectively solving the problem of unclear hammer patterns or even flattening of the hammer patterns when the existing spinning process is used to process the hammer patterns on the sheet. Moreover, the process of spinning the sheet into a pot embryo and the forming process of the second texture on the pot embryo are realized simultaneously, which greatly simplifies the processing technology. There is no need to design a corresponding forming mold for processing the hammer patterns for the pot embryo, thereby reducing production costs and improving the yield rate of finished cookware.

[0009] Furthermore, the outer convex surface includes a plane area and a side area surrounding the plane, the first pattern is arranged in the side area, and the center of the sheet is positioned at the center of the plane area; in the step S2, the pot embryo formed by pressing the sheet with the spinning roller includes a pot bottom covering the plane area and a pot side wall covering the side area.

[0010] In this technical solution, since the convex surface of the lower die includes a planar region and a side region, the planar region is more likely to stably clamp and position the sheet material, and the planar region is easy to align the center, ensuring that the shape of the pot blank produced by spinning is regular. During the process of spinning the sheet material into a pot blank, the cooperative action of the planar region and the side region of the convex surface can more firmly limit the position of the sheet material, preventing the sheet material from running off during the spinning process. The spinning roller spins the sheet material on the convex surface into a flat-bottomed pot blank with a pot bottom and a pot side wall, and the second texture is extruded and formed on the pot side wall, improving the non-stick effect of the pot side wall. Moreover, the spinning roller only applies pressure to the pot side wall part, and only sufficient pressure to fix the sheet material needs to be applied to the sheet material by the upper die and the lower die in the planar region. Therefore, the texture in the planar region can be well preserved.

[0011] In addition, flat-bottomed cookware also has many advantages. The pot bottom is flat, which is more conducive to uniform heating, performs well in heat conduction, is suitable for frying and stir-frying dishes, is applicable to stoves or induction cookers with small gas volume, small flame, dense and evenly distributed gas holes, is easy to clean, is easy to clean the oil stains and food residues on the pot bottom, and is relatively easy to stir-fry ingredients.

[0012] Furthermore, in the step S1, the processing method further includes: pre-stretching the sheet-shaped sheet material through a stretching process to make the sheet material form a shape adapted to the convex surface. In this technical solution, by pre-stretching the sheet material to form a shape adapted to the convex surface, when the upper die and the lower die clamp the sheet material before the spinning roller spins, the sheet material can directly cover the convex surface of the lower die, achieving good positioning and facilitating the subsequent spinning process. Moreover, the pre-stretched pot blank fits better with the lower die, so it is also more conducive to pressing out the second texture on the pot blank when the spinning roller works. In addition, for pot blanks that are not easy to directly spin and form a flat sheet material, such as round-bottomed pot blanks, the pot blank is pre-formed through a stretching process, and then the first texture is extruded and formed into the second texture on the inner surface of the pot blank through the spinning action of the spinning roller.

[0013] Furthermore, the convex surface is set as a circular curved surface, and the first texture covers the entire circular curved surface; in the step S2, the spinning roller presses the pre-stretched sheet material to form a pot blank, and the pot blank includes a circular pot bottom covering the curved surface. In this technical solution, the pre-stretched sheet material is spun through a spinning process to form a round-bottomed pot with the second texture. The round-bottomed pot is more adaptable to the stove, and the oil-gathering effect in the middle is better. Moreover, after the improvement of this process, the round-bottomed cookware can achieve full coverage of the second texture on the entire bottom surface, and the non-stick effect is excellent.

[0014] Furthermore, the height dimension of the first pattern is set to h, the thickness of the material sheet is set to H, and 0.3 mm ≤ h < H. The technical solution makes the height dimension of the first pattern designed to be within a reasonable size range of not less than 0.3 mm, avoiding the first pattern having a height dimension that is too small, which makes the height dimension of the second pattern formed by extrusion too small and makes the second pattern not clear and obvious, and also avoiding the first pattern having a height dimension that is too large, which makes the height dimension of the second pattern formed by extrusion too large and makes the wall of the final pot embryo be extruded into a wavy structure as a whole.

[0015] Furthermore, in step S2, the pot embryo formed by pressing the sheet by the spinning roller has a gradient zone, and when the spinning roller squeezes the sheet in the gradient zone, the pressure applied by the spinning roller to the sheet gradually increases from the center of the sheet to the outer periphery of the sheet. In the present technical solution, the finally formed pot has a thick bottom and a thin wall, and the pot wall becomes thinner as it is closer to the pot mouth. Through this design, on the one hand, the second texture formed at the part where the pot wall is thinner due to the pressure of the spinning roller will be more obvious, that is, the second texture at the pot mouth can become more obvious, so that the visual effect of the pot texture is better; on the other hand, the thick bottom and thin wall of the pot also has many advantages, for example: since the wall of the pot is thin, the overall weight will be reduced, making cooking more labor-saving; the thick bottom design can improve the heat storage capacity of the pot and make the heat distribution more uniform, thereby achieving faster heating speed and more stable temperature control; although the pot wall is thin, due to the use of spinning technology, the pot is not easy to deform during use and maintains good structural stability; since the pot with a thick bottom and thin wall has high thermal conductivity, it can reach the ideal cooking temperature at a lower firepower, thereby saving gas or electricity consumption.

[0016] Furthermore, the gradient zone has a proximal end close to the center of the pot embryo and a distal end far from the center of the pot embryo. After being extruded by the spinning roller, the thickness of the distal end is H1, the thickness of the proximal end is H2, and the ratio of H1 to H2 is 0.15-0.9. This technical solution sets the thickness change trend of the gradient zone within a reasonable size range, avoiding the influence of the strength due to the excessive difference in thickness between the distal end and the proximal end, and also avoiding the difficulty in exerting the advantages of the gradient zone due to the excessive difference in thickness between the distal end and the proximal end.

[0017] Furthermore, in the step S1, the processing method further includes: pre-processing a third concave-convex pattern on one side of the material sheet for forming the inner surface of the pot embryo. In the technical scheme, before the material sheet is spun by the spinning roller, a third pattern is pre-processed on the material sheet, such as a hammer pattern, so that after the material sheet is spun into the pot embryo, the first pattern will form a second pattern on the basis of the original third pattern of the material sheet, so that the third pattern is superimposed on the second pattern, effectively improving the obviousness of the pattern on the inner surface of the pot embryo; in addition, for the hammer pattern, the traditional hammer pattern is formed by repeated superposition and hammering, and the superposition formed pattern is closer to the hammer pattern formed by real hammering. Therefore, by making the material sheet have its own third pattern, not only the pattern finally formed on the pot is clearer, but also the pattern can be made more irregular, and the anti-stick pot effect is better.

[0018] Furthermore, the cookware processing method also includes step S3: subjecting the pot embryo to nitriding treatment and oxidation treatment in sequence; the nitriding treatment specifically comprises: placing the pot embryo in a nitriding furnace for heating, introducing a mixed gas of ammonia and carbon dioxide into the nitriding furnace, and subjecting the pot embryo to nitriding treatment; the oxidation treatment specifically comprises: placing the pot embryo in a blackening furnace for heating, introducing a blackening liquid into the nitriding furnace, and subjecting the pot embryo to oxidation treatment.

[0019] Furthermore, in the step S3, before the pot embryo is nitrided and oxidized, the processing method also includes: step S31: smoothing the mouth of the pot embryo; step S32: polishing the pot embryo; step S33: cleaning and drying the pot embryo; after the pot embryo is nitrided and before the pot embryo is oxidized, the processing method also includes: step S34: polishing the pot embryo; step S35: cleaning and drying the pot embryo; after the pot embryo is oxidized, the processing method also includes: step S36: polishing the pot embryo.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented according to the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 A schematic diagram of the structure of the spinning device provided in an embodiment of the present application;

[0023] Figure 2A schematic diagram of a state in which a sheet is clamped between an upper die and a lower die of a spinning device provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the state of a sheet being spun by a spinning roller in an embodiment of the present application;

[0025] Figure 4 A cross-sectional view of a pot embryo spun by a spinning device provided in an embodiment of the present application;

[0026] Figure 5 for Figure 4 A magnified view of the structure at center A;

[0027] Figure 6 for Figure 4 A magnified view of the structure at B in the middle;

[0028] Figure 7 for Figure 1 A magnified view of the structure at C in the middle;

[0029] Figure 8 A schematic diagram of the result of a sheet with a third pattern provided in an embodiment of the present application.

[0030] List of parts and reference numerals:

[0031] 1. Spinning roller;

[0032] 2 upper mold;

[0033] 3 lower die, 31 outer convex surface, 311 plane area, 312 side area, 3121 first grain;

[0034] 4 sheet, 41 third grain;

[0035] 5 pot embryo, 51 pot bottom, 52 pot side wall, 521 second pattern. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in the form of embodiments in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0038] In the embodiment of the present application, a method for processing a cookware is provided, based on a spinning device, referring to Figure 1As shown, the spinning device includes a spinning roller 1, an upper die 2 and a lower die 3. The lower die 3 is provided with an outer convex surface 31 adapted to the inner surface contour of the cookware. The outer convex surface 31 is provided with a first pattern 3121 in a concave-convex shape. It should be noted that only a simple structure or a partial structure of the spinning device is shown in the drawings, which does not limit the technical solution of the present invention and does not prevent the implementation of the cookware processing method in this solution. In other embodiments, the structure of the spinning device can be supplemented and enriched. The upper die 2 and the lower die 3 can be set such that at least one of them can move closer to or away from the other to clamp or release the sheet 4. For ease of understanding, Figure 7 FIG. Figure 7 is a partial enlarged view of the outer convex surface 31 of the lower die 3, showing the morphological structure of the first pattern 3121 in a concave-convex shape; in other embodiments, the first pattern 3121 can also be in other concave-convex morphological structures, which are not limited herein.

[0039] Embodiment 1:

[0040] A cookware processing method provided by the present application includes the following steps:

[0041] Step S1: Make the base material into a sheet-shaped sheet 4;

[0042] Step S2: Clamp and fix the sheet 4 through the upper die 2 and the lower die 3, and drive the sheet 4 to rotate by the upper die 2 and the lower die 3. During the rotation of the sheet 4, the spinning roller 1 presses the sheet 4 into a pot embryo 5 wrapped on the outer convex surface 31 of the lower die 3, and the pot embryo 5 is pressed against the first pattern 3121 through the spinning roller 1, so that the first pattern 3121 is extruded and formed into a second pattern 521 on the inner surface of the pot embryo 5.

[0043] Specifically, in step S1, the base material can be a coil or a flat material, and a sheet 4 of a certain size can be made on the coil or the flat material by stamping. In step S2, as Figure 2 shown, the sheet 4 can be pre-placed on the outer convex surface 31 of the lower die 3, and the sheet 4 is pre-positioned by the outer convex surface 31, and then the upper die 2 and the lower die 3 are brought closer to clamp the sheet 4. During the rotation of the upper die 2 and the lower die 3 driving the sheet 4, the spinning roller 1 can move along the Figure 3 direction indicated by the arrow in FIG. to press the sheet 4, so that the sheet 4 is bent and deformed into a state wrapped on the outer convex surface 31 of the lower die 3 until the sheet finally forms the shape of the pot embryo 5 as shown in Figure 4 FIG., and a second pattern 521 is formed on its inner surface.

[0044] In the technical solution, the first lines 3121 are arranged on the outer convex surface 31 of the lower mold 3. In the processing method, the spinning roller 1 extrude the first lines 3121 on the pot embryo 5, so that the first lines 3121 are extruded and formed into second lines 521 on the inner surface of the pot embryo 5. Since the first lines 3121 are concave and convex, the second lines 521 extruded and formed on the inner surface of the pot embryo 5 are also concave and convex, thereby adding a non-stick effect to the pot. In a preferred embodiment, the first lines 3121 can be designed as a hammer pattern. On this basis, the second lines 521 extruded and formed on the inner surface of the pot embryo 5 by the first lines 3121 are also hammer patterns. More importantly, the clarity of the second pattern 521 is positively correlated with the extrusion force applied by the spinning roller 1 on the sheet 4. In other words, during the forming process of the pot embryo 5, as the extrusion force applied by the spinning roller 1 to the sheet 4 increases, the sheet 4 is wrapped around the outer convex surface 31 of the punch with greater adhesion, and the second pattern 521 formed by the first pattern 3121 of the lower mold 3 being extruded on the inner surface of the pot embryo 5 will be clearer and more obvious, thereby effectively solving the problem of unclear hammer patterns or even flattening of the sheet with hammer patterns when the existing spinning process is used to process the sheet with hammer patterns. Moreover, the process of spinning the sheet 4 into the pot embryo 5 is realized simultaneously with the forming process of the second pattern 521 on the pot embryo 5, which greatly simplifies the processing technology. There is no need to design a corresponding forming mold for processing the hammer patterns for the pot embryo 5, thereby reducing production costs and improving the yield rate of finished cookware.

[0045] Embodiment 2:

[0046] In this embodiment, the outer convex surface 31 of the lower mold 3 is improved on the basis of the embodiment 1, so as to optimize the step S2, specifically: Figure 1 , Figure 3 and Figure 4As shown, the convex surface 31 includes a flat surface area 311 and a side surface area 312 surrounding the flat surface area 311. The first texture 3121 is provided on the side surface area 312, and the center of the sheet 4 is positioned at the center of the flat surface area 311. In the step S2, the pot embryo 5 formed by pressing the sheet 4 by the spinning roller 1 includes a pot bottom 51 covering the flat surface area 311 and a pot side wall 52 covering the side surface area 312. In this technical solution, since the convex surface 31 of the lower die 3 includes a flat surface area 311 and a side surface area 312, the flat surface area 311 is more likely to clamp and position the sheet 4. And during the process of spinning the sheet 4 into the pot embryo 5, the coordinated action of the flat surface area 311 and the side surface area 312 of the convex surface 31 can more firmly define the position of the sheet 4 and prevent the sheet 4 from running off during the spinning process. The spinning roller 1 spins the sheet 4 on the convex surface 31 into a flat-bottomed pot embryo with a pot bottom 51 and a pot side wall 52, and finally forms a flat-bottomed pot. Among them, the second texture 521 is extruded and formed on the pot side wall 52 to improve the non-stick effect of the pot side wall 52. In addition, the flat-bottomed pot also has many advantages. The pot bottom is flat, which is more conducive to uniform heating, performs well in heat conduction, is suitable for frying and stir-frying dishes, is applicable to stoves or induction cookers with small gas volume, small flame, dense and evenly distributed gas holes, is convenient to clean, is easy to clean the oil stains and food residues on the pot bottom, and is relatively easy to stir-fry ingredients.

[0047] In addition, the flat surface area 311 can also be provided with textures, and by setting the pressure between the upper die 2 and the flat surface area 311, when the upper die 2 and the lower die 3 clamp the sheet 4, uneven patterns can be formed on the flat bottom through this pressure.

[0048] Embodiment 3 (not specifically shown in the drawings):

[0049] This embodiment further improves the step S1 on the basis of Embodiment 1 to enhance the advantages. The specific improvement is as follows: In the step S1, the processing method further includes: pre-stretching the sheet-shaped sheet through a stretching process to make the sheet form a shape adapted to the convex surface. In this technical solution, by pre-stretching the sheet to form a shape adapted to the convex surface, when the upper die and the lower die clamp the sheet before the spinning roller spins, the sheet can be directly covered on the convex surface of the lower die, achieving good positioning and facilitating the subsequent spinning process. In addition, for pot embryos that are not easy to directly spin and form from flat sheets, such as round-bottomed pot embryos, the pot embryos are pre-formed through a stretching process, and after forming, the first texture is extruded and formed into the second texture on the inner surface of the pot embryo through the spinning action of the spinning roller.

[0050] On the basis of pre-stretching the blank in step S1, the convex surface of the lower die is further improved, so as to optimize the said step S2. The specific improvement is as follows: the convex surface is set as a circular curved surface, and the first pattern covers the circular curved surface; in the said step S2, the spinning roller presses the pre-stretched blank to form a pot embryo, and the pot embryo includes a circular bottom covered on the curved surface. In this technical solution, the pre-stretched blank is spun by a spinning process to form a round-bottomed pot with a second pattern. The round-bottomed pot is more suitable for the stove, and the oil-gathering effect in the middle is better. Moreover, after the process improvement, the round-bottomed pot can achieve the second pattern covering the entire bottom surface, and the non-stick effect is excellent. Preferably, to improve the plasticity of the material and the spinning speed, the stretched blank can be heated to a certain temperature before spinning.

[0051] Example 4:

[0052] This embodiment improves the spinning device to optimize the processing method. The specific improvement is as follows: as Figure 2 and Figure 7 shown, the height dimension of the first pattern 3121 is set as h, and the thickness of the blank 4 is set as H, 0.3mm ≤ h < H. It needs to be explained that: during actual processing, due to the inevitable existence of processing errors, therefore, there may be certain differences in the height dimensions of each position of the first pattern 3121. So h can be set as the maximum height dimension of the first pattern 3121 (the height difference between the lowest point position of the concave area and the highest point position of the convex area of the first pattern 3121); in addition, Figure 2 illustrates the thickness H of the equal-thickness blank. For a blank with a varying thickness (such as a blank with a gradient change in thickness), H refers to the thickness value at the position with the minimum thickness of the blank. This technical solution designs the height dimension of the first pattern 3121 within a reasonable range not less than 0.3mm, avoiding the height dimension of the first pattern 3121 being too small, resulting in the height dimension of the second pattern 521 extruded being too small and the second pattern 521 not being clear enough, and also avoiding the height dimension of the first pattern 3121 being too large, resulting in the height dimension of the second pattern 521 extruded being too large and the finally formed pot embryo 5 forming a wavy structure. Preferably, H can be 1mm - 3mm.

[0053] Example 5:

[0054] This embodiment further improves the said step S2 on the basis of Example 1 to enhance the advantages. The specific improvement is as follows: in the said step S2, as Figure 3 and Figure 4As shown, the pot blank 5 formed by pressing the sheet 4 with the spinning roller 1 has a gradual change area. When the spinning roller 1 extrudes the sheet 4 within the gradual change area, the pressure applied by the spinning roller 1 to the sheet 4 gradually increases from the center of the sheet 4 to the outer peripheral edge of the sheet 4. In this technical solution, the finally formed cookware has a thick bottom and thin walls, and the closer the position of the pot wall is to the pot mouth, the thinner it is. Through this design, on the one hand, the second texture 521 formed at the part where the thinner the pot wall is due to the greater pressure of the spinning roller 1 will be more obvious; on the other hand, the cookware with a thick bottom and thin walls also has many advantages. For example, since the wall of the cookware is thinner, the overall weight will be reduced, making it more labor-saving during cooking; the thick bottom design can improve the heat storage capacity of the cookware, make the heat distribution more uniform, so as to achieve a faster heating speed and more stable temperature control; although the wall of the cookware is thin, due to the use of the spinning technology, the cookware is not easily deformed during use and maintains good structural stability; because the cookware with a thick bottom and thin walls has high heat conduction efficiency, it can reach the ideal cooking temperature at a lower firepower, thus saving gas or electricity consumption.

[0055] Further, the gradual change area has a proximal end close to the center of the pot blank 5 and a distal end far from the center of the pot blank 5. After being extruded by the spinning roller 1, the thickness of the distal end is H1, and the thickness of the proximal end is H2. The ratio of H1 to H2 is 0.15 - 0.9. This technical solution sets the thickness change trend of the gradual change area within a reasonable size range, avoiding too large a thickness difference between the distal end and the proximal end that affects the strength, and also avoiding too small a thickness difference between the distal end and the proximal end that is difficult to exert the advantages of the gradual change area. It should be noted that this embodiment is applicable to both the solution of spinning the sheet 4 into a flat-bottomed pot blank 5 in the aforementioned embodiment 2 and the solution of spinning the sheet 4 into a round-bottomed pot blank 5 in the aforementioned embodiment 3. Taking the combination of this embodiment and embodiment 2 as an example, when the pot blank 5 is of a flat-bottomed structure, as Figure 4 、 Figure 5 and Figure 6 shown, the proximal end of the gradual change area can be set at the position connecting to the bottom 51 of the pot, where it is the thickest, and the distal end of the gradual change area can be set at the edge opening position of the pot blank 5, where it is the thinnest, so that the entire pot side wall 52 of the pot blank 5 forms a gradual change area. Among them, Figure 5 and Figure 6 show the position of the gradual change area by dotted lines. Specifically, if H2 is 2 mm, then the value of H1 is 0.3 - 1.8 mm. Taking the combination of this embodiment and embodiment 3 as an example, when the pot blank is of a round-bottomed structure, the proximal end of the gradual change area can be set at the center of the pot blank, where it is the thickest, and the distal end of the gradual change area is at the edge opening position of the pot blank, where it is the thinnest, so that the entire bottom surface of the cookware is a gradual change area.

[0056] Example 6:

[0057] This embodiment can be implemented on the basis of any of the above embodiments, and specifically improves the step S1: in the step S1, the processing method further includes: pre-processing a third concave-convex pattern 41 on one side of the material sheet 4 for forming the inner surface of the pot embryo 5. Figure 8 The example of the sheet 4 with the third texture 41 is shown. In the technical solution, before the sheet 4 is spun by the spinning roller 1, the third texture 41 is processed on the sheet 4 in advance, such as hammer texture is processed manually or automatically, so that after the sheet 4 is spun into the pot embryo 5, the first texture 3121 will form the second texture on the basis of the original third texture 41 of the sheet 4, so that the third texture 41 is superimposed on the second texture, which effectively improves the texture obviousness of the inner surface of the pot embryo 5; in addition, for the hammer texture, the more irregular the hammer texture is, the closer it is to the hammer texture formed by real hammering, therefore, by making the sheet 4 have the third texture 41, not only the texture finally formed on the pot is clearer, but also the texture can be made more irregular, and the anti-stick pot effect is better.

[0058] Embodiment 7:

[0059] This embodiment can be implemented on the basis of any of the foregoing embodiments, specifically: the processing method also includes step S3: subjecting the pot embryo 5 to nitriding treatment and oxidation treatment in sequence; the nitriding treatment specifically includes: placing the pot embryo 5 in a nitriding furnace for heating, introducing a mixed gas of ammonia and carbon dioxide into the nitriding furnace, and subjecting the pot embryo 5 to nitriding treatment; the oxidation treatment specifically includes: placing the pot embryo 5 in a blackening furnace for heating, introducing a blackening liquid into the nitriding furnace, and subjecting the pot embryo 5 to oxidation treatment.

[0060] The pots and pans that have been nitrided and oxidized have better corrosion resistance and can extend the service life of the pots and pans. In addition, pre-oxidation can give the pots and pans a natural black luster, which helps to improve users' acceptance of the pots and pans' appearance. In addition, nitriding and oxidation help to increase the hardness of the pots and pans, making the second pattern more wear-resistant.

[0061] Furthermore, in step S3, before the pot embryo 5 is subjected to nitriding and oxidation treatments, the processing method further comprises:

[0062] Step S31: Flatten the mouth of the pot embryo 5; specifically, the mouth of the pot embryo 5 can be flattened by lathe.

[0063] Step S32: polishing the pot embryo 5; specifically, the pot embryo 5 can be placed on a polishing machine and polished by the polishing machine;

[0064] Step S33: cleaning and drying the pot embryo 5; specifically, the pot embryo 5 can be placed in clean water for repeated cleaning and then dried.

[0065] Adopting the above steps can improve the effects of nitriding and oxidation, and impurities can be removed after polishing to prevent the impurities from affecting the effects of nitriding and oxidation.

[0066] Before the oxidation treatment of the pot blank 5 after the nitriding treatment, the processing method further includes:

[0067] Step S34: Polishing the pot blank 5; specifically, the pot blank 5 can be placed on a polishing machine and polished by the polishing machine.

[0068] Step S35: Cleaning and drying the pot blank 5; specifically, the pot blank 5 can be placed in clean water and repeatedly cleaned and then dried.

[0069] After the oxidation treatment of the pot blank 5, the processing method further includes:

[0070] Step S36: Polishing the pot blank 5; specifically, the pot blank 5 can be placed on a polishing machine and finally polished by the polishing machine to obtain the required spin-forged cookware.

[0071] What is not described in this application can be achieved by adopting or referring to the existing technologies.

[0072] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0073] The above are only the embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A method for processing cookware, characterized in that, Based on a spinning device, the spinning device includes a spinning roller, an upper mold, and a lower mold. The lower mold is provided with an outward convex surface adapted to the inner surface contour of the cookware, and the outward convex surface is provided with a first pattern in a concave-convex shape. The processing method includes: Step S1: Making a substrate into a sheet-like blank. Step S2: Clamping and fixing the blank between the upper mold and the lower mold, and driving the blank to rotate by the upper mold and the lower mold. During the rotation of the blank, the spinning roller presses the blank into a cookware blank wrapped on the outward convex surface of the lower mold, and the cookware blank is pressed against the first pattern by the spinning roller, so that a second pattern is formed by extrusion on the inner surface of the cookware blank.

2. The cookware processing method according to claim 1, wherein the outward convex surface includes a flat region and a side region surrounding the flat region. The first pattern is provided in the side region, and the center of the blank is positioned at the center of the flat region. In the step S2, the cookware blank formed by pressing the blank by the spinning roller includes a bottom of the pot wrapped on the flat region and a side wall of the pot wrapped on the side region.

3. The cookware processing method according to claim 1, wherein in the step S1, the processing method further includes: pre-stretching the sheet-like blank by a stretching process so that the blank forms a shape adapted to the outward convex surface.

4. The cookware processing method according to claim 3, wherein the outward convex surface is set as a circular curved surface, and the first pattern covers the circular curved surface. In the step S2, the spinning roller presses the pre-stretched blank into a cookware blank, and the cookware blank includes a circular bottom of the pot wrapped on the curved surface.

5. The cookware processing method according to claim 1, wherein the height dimension of the first pattern is set as h, and the thickness of the blank is set as H, 0.3mm ≤ h < H.

6. The cookware processing method according to claim 1, wherein in the step S2, the cookware blank formed by pressing the blank by the spinning roller has a gradual change region. When the spinning roller presses the blank in the gradual change region, the pressure applied by the spinning roller to the blank gradually increases from the center of the blank to the outer periphery of the blank.

7. The cookware processing method according to claim 6, wherein the gradual change region has a proximal end close to the center of the cookware blank and a distal end far from the center of the cookware blank. After being pressed by the spinning roller, the thickness of the distal end is H1, and the thickness of the proximal end is H2. The ratio of H1 to H2 is 0.15 - 0.

9.

8. The cookware processing method according to any one of claims 1-7, wherein in the step S1, the processing method further includes: pre-processing a third pattern in a concave-convex shape on one side of the blank for forming the inner surface of the cookware blank.

9. The cookware processing method according to any one of claims 1-7, wherein it further includes step S3: sequentially subjecting the cookware blank to nitriding treatment and oxidation treatment. The nitriding treatment is specifically as follows: placing the pot blank in a nitriding furnace for heating, introducing a mixed gas of ammonia and carbon dioxide into the nitriding furnace, and performing nitriding treatment on the pot blank; The oxidation treatment is specifically as follows: putting the pot blank into a blackening furnace for heating, introducing blackening liquid into the nitriding furnace, and performing oxidation treatment on the pot blank.

10. The pot processing method according to claim 9, wherein in the step S3, before the nitriding treatment and oxidation treatment of the pot blank, the processing method further includes: Step S31: performing leveling treatment on the mouth of the pot blank; Step S32: performing polishing treatment on the pot blank; Step S33: performing cleaning and drying treatment on the pot blank; After the nitriding treatment of the pot blank and before the oxidation treatment, the processing method further includes: Step S34: performing polishing treatment on the pot blank; Step S35: performing cleaning and drying treatment on the pot blank; After the oxidation treatment of the pot blank, the processing method further includes: Step S36: performing polishing treatment on the pot blank.

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