Forming process for composite pots

Abstract

The present application relates to the technical field of composite pot, and specifically discloses a forming process of a composite pot, which comprises the following steps: (1) performing stretching treatment on a composite plate to make a pot blank, wherein the pot blank comprises an outer layer, an intermediate layer and an inner layer which are combined together; (2) performing pretreatment on the pot blank; (3) performing turning processing on the pretreated pot blank to remove the outer layer and the intermediate layer at a pot opening, so that the inner layer has an extension part which exceeds the outer layer and the intermediate layer; (4) performing edge rolling treatment on the extension part, so that the extension part passes over the outer layer and the intermediate layer from above and is buckled on the outer side surface of the outer layer to form a covering edge; (5) performing roughening treatment on the inner side surface of the pot blank; (6) spraying an inner coating on the inner side surface of the pot blank; (7) placing the pot blank into a sintering furnace to perform sintering; and (8) performing polishing treatment on the outer side surface of the pot blank to make a composite pot. The present application is not easy to open after the edge is covered, and the closing effect of the pot opening and the product yield are improved.

Description

Technical Field

[0001] This invention relates to the field of cookware technology, and in particular to a molding process for a composite cookware. Background Technology

[0002] Existing composite cookware is usually made of multiple layers of metal materials, such as inner layer, outer layer and middle layer. For the rim of such cookware, it is necessary to perform closed edge treatment to prevent the middle layer (such as aluminum layer) from being exposed to the external environment and causing oxidation, corrosion and other problems.

[0003] In existing technologies, a common method for sealing the edges involves attaching an additional, independent edging structure to the pot rim, as illustrated by Chinese utility model patent CN208658730U. However, after the edging assembly is completed, composite cookware typically requires subsequent high-temperature processes such as sintering. Because this edging ring and the pot body are separate structures, the fit between the edging structure and the pot rim is prone to failure after high-temperature thermal cycling, leading to problems such as openings and loosening, which affects the sealing effect of the pot rim and the product yield. Summary of the Invention

[0004] This invention provides a molding process for a composite pot, which makes it less prone to opening after the edges are closed, thus improving the sealing effect of the pot opening and the product yield.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] An embodiment of the present invention provides a molding process for a composite pot, comprising the following steps:

[0007] (1) The composite board is stretched to form a pot blank, wherein the pot blank comprises an outer layer, a middle layer and an inner layer that are composited together;

[0008] (2) Pre-treat the pot blank;

[0009] (3) The pretreated pot blank is machined to remove the outer and middle layers at the pot opening, so that the inner layer has an extension beyond the outer and middle layers;

[0010] (4) Roll the edge of the extension so that the extension passes over the top of the outer layer and the middle layer and is turned over and fastened to the outer side of the outer layer to form a binding edge;

[0011] (5) Roughen the inner surface of the pot blank;

[0012] (6) Spray an inner coating onto the inner surface of the pot blank;

[0013] (7) Place it in a sintering furnace for sintering;

[0014] (8) Polish the outer surface of the pot blank to make a composite pot.

[0015] In some embodiments, step (2) specifically includes:

[0016] (21) Cut the pot blank at the pot opening so that the height of the pot blank reaches the preset height;

[0017] (22) Clean the pot blank;

[0018] (23) Pre-polishing and rough polishing are performed on the outer surface of the pot blank;

[0019] (24) The pot mouth is machined to flatten it and trim the edges.

[0020] In some embodiments, step (22) specifically includes: degreasing and dewaxing the pot blank, and washing the pot blank white.

[0021] In some embodiments, step (4) specifically includes:

[0022] (41) Use a crimping machine to pre-crease the extension, so that the extension passes over the outer and middle layers and bends downward;

[0023] (42) Use a curling machine to curl the bent extension part a second time, so that the extension part is turned over and attached to the outer side of the outer layer to form a binding edge.

[0024] In some embodiments, the following steps are further included between steps (3) and (4):

[0025] (31) Use sandpaper to polish the outer surface of the extension.

[0026] In some embodiments, step (5) specifically includes: using a sandblasting machine to sandblast and polish the inner surface of the pot blank, using 36# brown fused alumina and 46# brown fused alumina, with 36# brown fused alumina and 46# brown fused alumina configured in a 1:1 ratio, so that the roughness of the inner surface of the pot blank reaches 2.5~3.5am.

[0027] In some embodiments, step (7) specifically includes: the sintering furnace first performs sintering at a furnace temperature of 280~300 degrees, and then performs secondary sintering at a furnace temperature of 380~400 degrees.

[0028] In some embodiments, the step of polishing the outer surface of the pot blank in step (8) specifically includes: using a polishing machine to first remove the residual paint on the outer peripheral surface of the pot blank, and then finely polishing the outer peripheral surface of the pot blank; using a sander to first remove the residual paint on the outer bottom surface of the pot blank, and then finely polishing the outer bottom surface of the pot blank.

[0029] In some embodiments, the method further includes step (9): stamping an inner groove in the bottom of the pot.

[0030] In some embodiments, the height L of the edging is 7±0.5mm; the outer and inner layers are made of steel, and the middle layer is made of aluminum; the connection between the edging and the inner layer, as well as the bends of the edging, are rounded.

[0031] The present invention has at least the following beneficial effects: The present invention performs machining on the pot blank to remove the outer and middle layers at the pot opening, so that the inner layer has an extension that extends beyond the outer and middle layers. The extension is then rolled so that the extension passes over the outer and middle layers and is snapped onto the outer side of the outer layer to form a rim. This rim is not easy to detach from the outer layer and is not easy to open after the rim is closed, thus improving the sealing effect of the pot opening and the product yield.

[0032] At the same time, it can overcome the limitation of material thickness at the pot opening on closed edges, and can process and manufacture closed edges with a material thickness of 1.5~2.5mm. Attached Figure Description

[0033] Figure 1 This is a cross-sectional schematic diagram of a pot blank according to an embodiment of the present invention;

[0034] Figure 2 This is a cross-sectional schematic diagram of the pot blank after pretreatment according to an embodiment of the present invention;

[0035] Figure 3 This is a cross-sectional view of a pot blank after machining, according to an embodiment of the present invention.

[0036] Figure 4 This is a cross-sectional view of a pot blank after edge rolling according to an embodiment of the present invention;

[0037] Figure 5 This is a cross-sectional schematic diagram of a composite pot according to an embodiment of the present invention;

[0038] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0039] Figure 7 This is a cross-sectional view of the pot blank after pre-rolling treatment according to an embodiment of the present invention.

[0040] The attached figures are labeled as follows:

[0041] The pot body is 100, the inner groove is 101, the outer layer is 110, the middle layer is 120, the inner layer is 130, the extension is 131, the edging is 140, and the inner coating is 150. Detailed Implementation

[0042] The present invention is provided below with reference to the accompanying drawings to aid in a full understanding of the various embodiments of the invention as defined by the claims and their equivalents. The description includes various specific details to aid understanding, but these details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the invention.

[0043] In the description of this invention, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0045] An embodiment of the present invention provides a molding process for a composite pot, comprising the following steps:

[0046] (1) The composite board is stretched to form a pot blank, which includes an outer layer, a middle layer and an inner layer that are composited together.

[0047] Composite panels consist of outer, middle, and inner layers bonded together. They can be stretched using a hydraulic press and stretching dies to transform them from sheet material into a blank. For example... Figure 1 As shown, the pot blank includes a pot body 100, which includes an outer layer 110, a middle layer 120, and an inner layer 130 from the outside to the inside. The hydraulic press can be 200T, and the stamping pressure can be 8MPa.

[0048] (2) Pre-treatment of the pot blank.

[0049] Before machining the pot blank, it is necessary to pre-treat it to ensure it meets the requirements of subsequent processing and maintains a certain level of cleanliness, preventing contamination or damage during processing. The pre-treated pot blank should look like this: Figure 2 As shown, the side wall of the pot body 100 can be cylindrical, spherical, frustum-shaped, or other shapes as needed.

[0050] (3) The pre-treated pot blank is machined to remove the outer and middle layers at the pot opening, so that the inner layer has an extension beyond the outer and middle layers.

[0051] The outer and middle layers at the pot opening are removed by turning, thus exposing the inner layer at the pot opening, forming a shape like... Figure 3 The extension 131 shown is the portion of the inner layer 130 that extends upward beyond the outer layer 110 and the intermediate layer 120, which is equivalent to the extension 131 being integrally formed with the inner layer 130. Since the pot opening is annular, the extension 131 is naturally also annular in structure.

[0052] (4) Roll the edge of the extension so that the extension passes over the top of the outer layer and the middle layer and is turned over and attached to the outer side of the outer layer to form an edge.

[0053] like Figure 4 As shown, the extension passes over the outer layer 110 and the middle layer 120 and is snapped back onto the outer side of the outer layer 110, thus becoming a edging 140, which covers the top of the middle layer 120 and the outer layer 110.

[0054] (5) Roughen the inner surface of the pot blank.

[0055] The roughening process increases the roughness of the inner surface of the pot blank to facilitate coating adhesion.

[0056] (6) Spray an inner coating on the inner side of the pot blank.

[0057] like Figure 6 As shown, the inner coating 150 can be a common coating on the inner wall of a pot. The function of the inner coating 150 includes, but is not limited to, protecting the inner wall of the pot, increasing wear resistance, and achieving non-stick properties.

[0058] (7) Place it in a sintering furnace for sintering.

[0059] The inner coating is solidified on the inner wall of the pot by sintering, making it difficult to peel off.

[0060] (8) Polish the outer surface of the pot blank to make a composite pot.

[0061] Polishing can remove scratches, dents and other processing defects as well as impurities on the surface, making the outer surface of the pot clean and tidy, and improving the visual quality of the product.

[0062] In this embodiment, the pot blank is machined to remove the outer and middle layers at the pot opening, so that the inner layer has an extension that extends beyond the outer and middle layers. The extension is then rolled so that it passes over the outer and middle layers and is snapped onto the outer side of the outer layer to form a rim. This rim is not easy to detach from the outer layer and is not easy to open after the edge is closed, thus improving the sealing effect of the pot opening and the product yield.

[0063] Meanwhile, due to the turning process on the pot opening, the material thickness limitation of the closed edge at the pot opening can be overcome, and closed edges with a material thickness of 1.5~2.5mm can be processed and manufactured.

[0064] In some embodiments, reference Figure 5 and Figure 6 The bottom end of the binding 140 is tightly attached to the outer side of the outer layer 110, ensuring that the binding 140 is securely fastened to the outer side of the outer layer 110. Since the binding 140 needs to be fastened to the outer side of the outer layer 110 through a bending process, the binding 140 itself will bend. The bottom end of the binding 140 being tightly attached to the outer side of the outer layer 110 is more suitable for the bent structure and is easier to achieve in terms of process.

[0065] In some embodiments, reference Figure 5 and Figure 6 The edging 140 located on the outer side of the outer layer 110 is arc-shaped. The arc-shaped structure design can eliminate sharp edges and improve safety. At the same time, it also helps to enhance the structural strength and rigidity. In addition, it can also optimize the appearance of the product.

[0066] In some embodiments, step (2) specifically includes:

[0067] (21) Cut the pot blank at the pot opening so that the pot blank reaches the preset height.

[0068] Since the pot blank has a large margin, it is necessary to cut off part of the material at the top of the pot blank. The height of the cut pot blank should reach the preset height. The preset height should not only meet the height requirements of the finished product, but also take into account the margin for removing the outer and middle layers at the pot opening during subsequent machining.

[0069] (22) Clean the pot blank.

[0070] The pot blank is cleaned to make its surface clean, greatly reducing surface impurities and facilitating subsequent processing.

[0071] (23) The outer surface of the pot blank is pre-polished and rough polished.

[0072] Pre-polishing removes oxide scale from the outer surface of the pot blank, while rough polishing prepares it for subsequent fine polishing and the application of the inner coating. Pre-polishing and rough polishing can be performed manually or automatically using a polishing machine.

[0073] (24) The pot mouth is machined to flatten it and trim the edges.

[0074] The cut pot opening may have burrs or other defects. By machining it, these defects can be eliminated, and the flatness of the pot opening can be improved.

[0075] In some embodiments, step (22) specifically includes: degreasing and dewaxing the pot blank, and washing the pot blank white. The surface of the pot blank is usually covered with industrial anti-rust wax and processing oil stains, which need to be thoroughly removed to prevent affecting subsequent processing. Specifically, the pot blank can be soaked in hot water above 80°C to soften the wax layer and oil stains with high temperature, and then the surface of the pot can be cleaned with detergent to effectively remove oil and wax and remove yellowing, blackening or heavy stains on the surface.

[0076] In some embodiments, step (4) specifically includes:

[0077] (41) Use a crimping machine to pre-crease the extension, so that the extension passes over the outer and middle layers and bends downward;

[0078] (42) Use a curling machine to curl the bent extension part a second time, so that the extension part is turned over and attached to the outer side of the outer layer to form a binding edge.

[0079] In this embodiment, the extension portion undergoes two rounds of edge curling. After pre-crewing, the extension portion 131 forms a shape similar to... Figure 7 The structure shown allows the extension 131 to be initially bent through pre-rolling, providing an accurate reference for subsequent edge rolling. Compared to one-time molding, step-by-step molding avoids excessive material stretching caused by excessive pressure applied in a single step, preventing product damage and ensuring product qualification rate.

[0080] In some embodiments, the following step is further included between steps (3) and (4): (31) sanding the outer surface of the extension with sandpaper.

[0081] Impurities on the outer side of the extension can be removed by polishing. After the edge is rolled, the outer side of the extension becomes the inner side of the edging that is close to the outer layer.

[0082] In some embodiments, step (5) specifically includes: using a sandblasting machine to sandblast and polish the inner surface of the pot blank, using 36# brown fused alumina and 46# brown fused alumina, with 36# brown fused alumina and 46# brown fused alumina configured in a 1:1 ratio, so that the roughness of the inner surface of the pot blank reaches 2.5~3.5am.

[0083] 36# brown fused alumina particles are coarser and have stronger cutting power, serving as the base coat to create the main roughness. 46# brown fused alumina particles are medium-sized, supplementing and refining the surface, filling the pits left by the coarser particles. This balances cleanliness and surface finish. Mixing the two in a 1:1 ratio aims to achieve a more evenly distributed and controllable final surface. A roughness of 2.5~3.5 μm provides sufficient "anchor points" for strong coating adhesion while ensuring a relatively uniform surface, preventing excessive roughness from affecting the final appearance or cleanliness.

[0084] In some embodiments, step (7) specifically includes: the sintering furnace first performs sintering at a furnace temperature of 280~300 degrees, and then performs secondary sintering at a furnace temperature of 380~400 degrees.

[0085] A furnace temperature of 280-300 degrees Celsius allows the coating to be pre-fused and initially shaped, while a furnace temperature of 380-400 degrees Celsius allows the coating to be fully sintered and completely cured, forming the final dense coating.

[0086] In some embodiments, the step of polishing the outer surface of the pot blank in step (8) specifically includes: using a polishing machine to first remove the residual coating on the outer peripheral surface of the pot blank, and then finely polishing the outer peripheral surface of the pot blank; using a sander to first remove the residual coating on the outer bottom surface of the pot blank, and then finely polishing the outer bottom surface of the pot blank.

[0087] Since residual paint adheres to both the inner and outer surfaces of cookware during the spraying process, rough polishing can quickly remove residual paint, burrs, rough edges, or slight oxide layers. Based on rough polishing, fine polishing can eliminate the sanding marks left by rough polishing, so that the outer surface achieves the required smoothness, flatness, and consistency to improve the product appearance.

[0088] In some embodiments, the method further includes step (9): stamping an inner groove in the bottom of the pot.

[0089] like Figure 5 As shown, the bottom of the pot has an inner groove 101, which makes the surface area of ​​the pot bottom larger than that of a flat bottom, allowing it to absorb more heat and thus shorten the heating time.

[0090] In some embodiments, such as Figure 6 As shown, the height L of the edging 140 is 7±0.5mm, ensuring that the edging 140 has sufficient height to cover the top of the middle layer 120 and the outer layer 110, thus ensuring its covering function.

[0091] In some embodiments, the outer layer 110 and the inner layer 130 may be made of steel, and the middle layer 120 may be made of aluminum.

[0092] In some embodiments, the connection between the edging 140 and the inner layer 130, as well as the bends of the edging 140, are rounded. The rounded corner design makes the connection between the edging 140 and the inner layer 130, as well as the bends of the edging 140, relatively smooth, making it less likely to scratch the user. In addition, the bends of the edging 140 are smoothly transitioned, avoiding stress concentration and effectively suppressing cracks.

[0093] The terms and words used in the foregoing description and claims are not limited to their literal meaning, but are merely used by the applicant to enable a clear and consistent understanding of the invention. Therefore, those skilled in the art will understand that the foregoing description of various embodiments of the invention is illustrative only and not intended to limit the invention as defined by the appended claims and their equivalents.

Claims

1. A molding process for a composite pot, characterized in that, Includes the following steps: (1) The composite board is stretched to form a pot blank, wherein the pot blank comprises an outer layer, a middle layer and an inner layer that are composited together; (2) Pre-treat the pot blank; (3) The pretreated pot blank is machined to remove the outer and middle layers at the pot opening, so that the inner layer has an extension beyond the outer and middle layers; (4) Roll the edge of the extension so that the extension passes over the top of the outer layer and the middle layer and is turned over and fastened to the outer side of the outer layer to form a binding edge; (5) Roughen the inner surface of the pot blank; (6) Spray an inner coating onto the inner surface of the pot blank; (7) Place it in a sintering furnace for sintering; (8) Polish the outer surface of the pot blank to make a composite pot.

2. The molding process of the composite pot according to claim 1, characterized in that, Step (2) specifically includes: (21) Cut the pot blank at the pot opening so that the height of the pot blank reaches the preset height; (22) Clean the pot blank; (23) Pre-polishing and rough polishing are performed on the outer surface of the pot blank; (24) The pot mouth is machined to flatten it and trim the edges.

3. The molding process of the composite pot according to claim 2, characterized in that, The specific steps (22) include: removing oil and wax from the pot blank and washing the pot blank white.

4. The molding process of the composite pot according to claim 1, characterized in that, Step (4) specifically includes: (41) Use a crimping machine to pre-crease the extension, so that the extension passes over the outer and middle layers and bends downward; (42) Use a curling machine to curl the bent extension part a second time, so that the extension part is turned over and attached to the outer side of the outer layer to form a binding edge.

5. The molding process of the composite pot according to claim 1, characterized in that, The following steps are also included between steps (3) and (4): (31) Use sandpaper to polish the outer surface of the extension.

6. The molding process of the composite pot according to claim 1, characterized in that, Step (5) specifically includes: using a sandblasting machine to sandblast and polish the inner surface of the pot blank, using 36# brown fused alumina and 46# brown fused alumina, with 36# brown fused alumina and 46# brown fused alumina configured in a 1:1 ratio, so that the roughness of the inner surface of the pot blank reaches 2.5~3.5am.

7. The molding process of the composite pot according to claim 1, characterized in that, The specific steps (7) include: the sintering furnace first performs sintering at a furnace temperature of 280-300 degrees, and then performs secondary sintering at a furnace temperature of 380-400 degrees.

8. The molding process of the composite pot according to claim 1, characterized in that, The step (8) of polishing the outer surface of the pot blank specifically includes: using a polishing machine to first remove the residual paint on the outer periphery of the pot blank, and then finely polishing the outer periphery of the pot blank; using a sander to first remove the residual paint on the outer bottom surface of the pot blank, and then finely polishing the outer bottom surface of the pot blank.

9. The molding process of the composite pot according to any one of claims 1 to 8, characterized in that, It also includes step (9): stamping an inner groove into the bottom of the pot.

10. The molding process of the composite pot according to any one of claims 1 to 8, characterized in that: The height L of the edging is 7±0.5mm; the outer and inner layers are made of steel, and the middle layer is made of aluminum; the connection between the edging and the inner layer, as well as the bends of the edging, are all rounded.

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