An energy-saving cookware and its processing method

Abstract

This application discloses an energy-saving cookware and its processing method, relating to the field of cookware technology. The energy-saving cookware includes a pot body with a flat bottom surface, and an electromagnetic induction pot bottom assembly composited on the outer side of the bottom surface. The electromagnetic induction pot bottom assembly includes: a first substrate composited on the outer side of the bottom surface and having several through holes thereon; and a second substrate composited on the outer side of the first substrate, with a flat surface on the side away from the pot body. The double-layer magnetic conductive structure, compared to a single-layer magnetic conductive plate, effectively enhances the electromagnetic induction intensity, improves eddy current generation efficiency, and allows for more complete utilization of magnetic field lines, accelerating heating speed and reducing heat loss to the pot body's periphery, significantly improving overall energy efficiency and achieving energy-saving effects. The second substrate has a flat surface on the side away from the pot body, and no through holes are provided thereon. This structure, while ensuring the electromagnetic induction function, makes the bottom of the cookware smooth, flat, and easy to clean.

Description

Technical Field

[0001] This application relates to the field of cookware technology, and in particular discloses an energy-saving cookware and its processing method. Background Technology

[0002] Electromagnetic heating cookware has been widely used in cooking appliances such as induction cookers due to its high heating efficiency, safety and environmental friendliness, and ease of temperature control. Currently, common electromagnetic cookware usually has a layer of magnetic metal plate, such as 430 stainless steel plate, on the bottom of the pot body. It uses the principle of electromagnetic induction to generate eddy currents at the bottom of the pot to heat up, thereby achieving the heating function.

[0003] However, the existing single-layer magnetic composite bottom structure still has the following technical problems in actual use and manufacturing: First, the single-layer magnetic plate and the bottom surface of the pot are usually bonded together over a large area. The thermal expansion coefficients of the two materials are different. During repeated heating and cooling cycles, large thermal stress is easily generated at the interface. The long-term accumulation of this stress can lead to blistering of the composite layer, edge lifting, or even the complete peeling of the magnetic plate, which seriously shortens the service life of the cookware and poses safety hazards. In order to alleviate thermal stress and improve the bonding strength between the magnetic layer and the pot body, some existing technologies have attempted to open through holes or grooves on the magnetic plate. However, if the uneven surface formed after the holes are directly exposed, it will make the bottom of the cookware rough and difficult to clean, reducing the overall aesthetics of the product and the user experience. Second, the electromagnetic induction efficiency of the single-layer magnetic plate is limited. Some magnetic lines of force are not effectively utilized, and the heat generation and transfer path is relatively simple, resulting in a slow heating speed and a lot of heat loss to the periphery of the pot body. The overall energy efficiency is not high, and the energy-saving effect needs to be further improved.

[0004] Of course, there are some cookwares with double-layer composite bottom structures, but most of them are manufactured by brazing. Brazing requires high-temperature furnace welding and special solder, which involves large equipment investment and high energy consumption. It is not suitable for small and medium batch production and scenarios with high cost control requirements, so it needs to be improved. Summary of the Invention

[0005] The purpose of this application is to provide an energy-saving cookware.

[0006] Another objective of this application is to provide a method for processing energy-saving cookware.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: an energy-saving cookware, including a pot body, the bottom of which is formed with a flat bottom surface, and an electromagnetic induction pot bottom assembly composited on the outside of the bottom surface, the electromagnetic induction pot bottom assembly including: a first substrate, the first substrate being composited on the outside of the bottom surface and having a plurality of through holes thereon; and a second substrate, the second substrate being composited on the outside of the first substrate and having a flat surface on the side away from the pot body.

[0008] As a preferred embodiment, the first substrate is formed with the through hole by punching, and a flange is formed simultaneously at the edge of the through hole during the punching process. The protruding direction of the flange is the same as the punching direction. The flange is configured to be embedded into the bottom of the pot body when the electromagnetic induction pot bottom assembly is pressed with the pot body to achieve a fixed connection with the pot body.

[0009] More preferably, the through holes are arranged in a regular array on the first substrate, and the array includes a honeycomb array, a concentric ring array, a rectangular array, or a spiral array.

[0010] More preferably, the outer contours of the first substrate and the second substrate are the same and are fixedly connected by laser welding, thereby forming a plurality of continuous welds and / or a plurality of spot welds on them, and the side of the first substrate with the flange is away from the second substrate.

[0011] As a preferred embodiment, the pot body is integrally formed from a blank by stamping, and the blank has an assembly groove in the middle. The electromagnetic induction pot bottom assembly is fixedly connected in the assembly groove, and the contour of the assembly groove is adapted to the contour of the electromagnetic induction pot bottom assembly.

[0012] More preferably, after the blank is pressed with the electromagnetic induction pot bottom assembly, the side of the second substrate away from the first substrate is flush with the surface of the blank.

[0013] A method for processing energy-saving cookware, used to process any of the energy-saving cookware described above, includes the following steps: Step A: Align and stack the first substrate and the second substrate on the laser welding equipment, and weld and fix the first substrate and the second substrate together to form an electromagnetic induction pot bottom assembly. Step B: Place the blank in the pressing equipment and place the electromagnetic induction pot bottom assembly in the assembly groove of the blank. Use the pressing equipment to press and fix the electromagnetic induction pot bottom assembly to the blank to form a pot blank. Step C: The cookware blank is stamped into the shape of a cookware and then machined to optimize its appearance; Step D: Install the handle to complete the cookware.

[0014] As a preferred embodiment, in step A, the first substrate and the second substrate form several spot welds using a laser welding device, and each spot weld is located within a non-porous area enclosed by several through holes.

[0015] As a preferred embodiment, in step B, the pressing equipment operates continuously. In the initial stage of pressing, the pressing equipment pre-presses the electromagnetic induction pot bottom assembly into the assembly groove of the blank, so that the flange on the first substrate is initially embedded in the bottom of the assembly groove. In the later stage of pressing, the pressing equipment continues to apply pressure, so that the flange on the first substrate is completely embedded in the bottom of the assembly groove.

[0016] As a preferred option, the machining in step C includes trimming the rim of the pot and precision machining the edge of the electromagnetic induction pot bottom assembly. Trimming the rim removes excess burrs or waste material to make the rim flat. Precision machining the edge of the electromagnetic induction pot bottom assembly removes burrs or protrusions to make it transition smoothly with the pot body.

[0017] Compared with the prior art, the beneficial effects of this application are as follows: (1) This application constructs a double-layer electromagnetic induction component by setting a first substrate and a second substrate on the outer side of the bottom surface of the pot body. The first substrate has several through holes. The through hole structure can accommodate the material of the bottom surface of the pot body during the pressing process, forming an anchoring effect and significantly improving the bonding strength between the first substrate and the pot body. On the other hand, when the pot body is used alternately with hot and cold, the through holes provide space for the release of thermal stress, effectively avoiding blistering, warping or peeling caused by the difference in the thermal expansion coefficient of the materials, and greatly improving the service life and safety reliability of the pot. The side of the second substrate away from the pot body has a flat surface and no through holes are opened on it. This structure ensures the electromagnetic induction function, makes the bottom of the pot body smooth, flat and easy to clean, and overcomes the defects of the existing open magnetic plates that are directly exposed, such as rough appearance and dirt accumulation, and improves the aesthetics of the product and the user experience.

[0018] (2) This application adopts a double-layer magnetic structure of the first substrate and the second substrate. Compared with the traditional single-layer magnetic plate, it can effectively enhance the electromagnetic induction intensity, improve the eddy current generation efficiency, and make fuller use of the magnetic field lines, thereby accelerating the heating speed, reducing the heat loss to the pot body, significantly improving the overall energy efficiency level, and achieving energy saving effect.

[0019] (3) The processing method provided in this application uses a pressing device to press and fix the electromagnetic induction pot bottom assembly and the blank, and then stamps and forms the pot. It does not require a high-temperature brazing furnace and special solder. The equipment investment is small, the energy consumption is low, and the stamping and forming efficiency is high, which is suitable for mass production. In addition, the two substrates are welded and fixed first and then pressed with the blank, which ensures the relative position accuracy and bonding firmness between the two substrates. The subsequent stamping and forming can further make the layers fit tightly together. The process is consistent and reliable, and the manufacturing cost is greatly reduced while ensuring product quality.

[0020] (4) The through holes on the first substrate of this application can also promote mechanical interlocking between the pot body material and the first substrate during the pressing and stamping process. No additional brazing filler or adhesive is required, which simplifies the process steps and avoids material oxidation or deformation problems that may be caused by high temperature welding, further improving the overall structural stability of the pot. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is an exploded view of the three-dimensional structure of the present invention.

[0023] Figure 3 This is a cross-sectional view of the present invention.

[0024] Figure 4 yes Figure 3 A magnified view of part A.

[0025] Figure 5 This is an exploded view of the three-dimensional structure of the electromagnetic induction pot bottom assembly of the present invention.

[0026] Figure 6 This is a partial structural diagram of the first substrate of the present invention.

[0027] Figure 7 This is a schematic diagram of the laser welding and fixing of the first substrate and the second substrate of the present invention.

[0028] Figure 8 This is a partially enlarged view of the laser welding and fixing of the first substrate and the second substrate of the present invention.

[0029] Figure 9 This is an exploded view of the assembly of the raw material and the electromagnetic induction pot bottom component of the present invention.

[0030] Figure 10 This is a schematic diagram of the electromagnetic induction pot bottom assembly and the blank being pressed and fixed together according to the present invention.

[0031] Figure 11 This is a partially enlarged view of the electromagnetic induction pot bottom assembly and the blank being pressed and fixed together according to the present invention.

[0032] Figure 12 This is a process flow diagram of the energy-saving cookware of the present invention.

[0033] In the figure: 1. Pot body; 2. Electromagnetic induction pot bottom assembly; 21. First substrate; 211. Through hole; 212. Flanged edge; 22. Second substrate; 3. Raw material; 31. Assembly groove; 4. Laser welding equipment; 5. Pressing equipment. Detailed Implementation

[0034] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and should not be construed as limiting the specific protection scope of this application.

[0036] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0037] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0038] Current electromagnetic heating cookware generally uses a single-layer magnetic metal plate (such as 430 stainless steel) laminated to the bottom of the pot, utilizing electromagnetic induction to generate eddy currents for heating. However, this structure has significant drawbacks: the difference in thermal expansion coefficients between the magnetic plate and the pot body materials easily generates thermal stress during repeated heating and cooling cycles, leading to blistering, warping, or even peeling of the composite layer, affecting its lifespan and posing safety hazards. If through holes or grooves are made in the magnetic plate to alleviate stress, it results in a rough pot bottom surface that is difficult to clean, reducing aesthetics and user experience. Furthermore, the electromagnetic induction efficiency of a single-layer magnetic plate is limited, the heat generation and transfer path is singular, the heating speed is slow, and heat loss is significant, resulting in low overall energy efficiency. Of course, there are also some dual-layer magnetic plates available on the market... While some double-layer composite bottom cookware can improve performance, they are mostly manufactured using brazing processes, requiring high-temperature furnace welding and special solders. This results in high equipment investment and energy consumption, making them unsuitable for small- to medium-batch production and cost control requirements. Therefore, it is necessary to design a cookware that can effectively eliminate or alleviate thermal stress between the magnetic layer and the pot body, preventing blistering, warping, and peeling. At the same time, it should ensure a smooth and flat bottom for easy cleaning, and possess higher electromagnetic induction efficiency and a better heat transfer path to improve heating speed and overall energy efficiency, while reducing heat loss. Furthermore, its manufacturing process should avoid high-energy-consuming and high-equipment-investment methods such as high-temperature brazing to reduce production costs and make it suitable for small- to medium-batch production scenarios.

[0039] A preferred embodiment of this application, such as Figures 1 to 6 As shown, an energy-saving cookware includes a pot body 1 and an electromagnetic induction pot bottom assembly 2 composited on the outer side of the bottom surface. The pot body 1 is integrally formed by stamping a blank 3. The blank 3 has an assembly groove 31 in the middle. The assembly groove 31 is designed to achieve precise positioning, ensuring that the electromagnetic induction pot bottom assembly 2 will not shift during pressing, and has high positioning accuracy. The bottom of the pot body 1 is formed with a flat bottom surface. The electromagnetic induction pot bottom assembly 2 is fixedly connected in the assembly groove 31, and the contour of the assembly groove 31 is adapted to the contour of the electromagnetic induction pot bottom assembly 2.

[0040] Since the cookware in this embodiment is used for an induction cooker, its bottom surface needs to be set as a plane. In terms of material settings, since the pot body 1 is generally made of non-magnetic materials with good thermal conductivity, such as aluminum, non-magnetic stainless steel, ceramics, etc., it is necessary to set an electromagnetic induction pot bottom component 2 on its bottom surface. Its material must be a magnetic material, such as 430 stainless steel. Of course, other suitable magnetic materials can also be selected, and the specific adjustments can be made according to the actual design requirements based on the needs of those skilled in the art.

[0041] In this embodiment, the electromagnetic induction pot bottom assembly 2 includes: a first substrate 21, which is laminated to the outer side of the bottom surface and has a plurality of through holes 211 thereon; and a second substrate 22, which is laminated to the outer side of the first substrate 21 and has a flat surface on the side away from the pot body 1.

[0042] In this embodiment, after the blank 3 is pressed with the electromagnetic induction pot bottom assembly 2, the electromagnetic induction pot bottom assembly 2 sinks into the groove. The side of the second substrate 22 away from the first substrate 21 is flush with the surface of the blank 3, forming a smooth and continuous outer surface of the pot bottom without steps or protrusions. It is easy to clean and does not easily scratch the stove panel. Moreover, this flush structure makes the cookware look beautiful and improves the product grade.

[0043] The through-hole 211 structure on the first substrate 21 allows the pot body 1 material to be embedded during pressing, forming a mechanical interlock, which significantly improves the bonding strength of the composite layer and prevents delamination or detachment during use; the flat surface on the outer side of the second substrate 22 ensures full contact with the induction cooker panel, improves thermal efficiency, and ensures the stability of the pot; compared with the fully composite magnetic material pot bottom, the through-hole 211 design of this embodiment reduces the amount of magnetic material used, reduces costs, and reduces the overall weight.

[0044] In actual design, the thickness of the pot body 1 is generally set to 1.5mm~3mm, the thickness of the first substrate 21 is generally set to 0.4mm~1mm, and the thickness of the second substrate 22 is generally set to 0.3mm~0.8mm. Of course, in some embodiments, the electromagnetic induction pot bottom assembly 2 is allowed to extend beyond the bottom surface of the pot body 1 after being combined with the pot body 1. At the same time, in order to ensure the tightness of the pressing between the electromagnetic induction pot bottom assembly 2 and the pot bottom, the thickness of the first substrate 21 and the second substrate 22 can be appropriately increased, but it is generally set to less than 1.5mm. The specific parameters are selected by those skilled in the art according to the actual situation.

[0045] Regarding the choice of materials, in some embodiments, the pot body 1 can be made of 3003 aluminum alloy, and the first substrate 21 and the second substrate 22 can both be made of 430 stainless steel. Of course, in other embodiments, the first substrate 21 can be made of cold-rolled steel plate and nickel-plated on the surface for rust prevention, and the second substrate 22 can be made of 430 stainless steel. By choosing materials in this way, the cost can be lowered, but good magnetic conductivity can still be maintained.

[0046] It should be noted that in this embodiment, the first substrate 21 has a through hole 211 formed by punching, and a flange 212 is formed simultaneously on the edge of the through hole 211 during the punching process. The protruding direction of the flange 212 is the same as the punching direction. The flange 212 is configured to be embedded in the bottom of the pot body 1 when the electromagnetic induction pot bottom assembly 2 is pressed with the pot body 1 to achieve a fixed connection with the pot body 1.

[0047] The aforementioned punched and flanged 212 is integrally formed, which is simple in process, has high production efficiency and low cost. Furthermore, the flanged 212 structure can be embedded into the material of the pot body 1 during pressing, forming a strong anchoring force, which is far superior to simply relying on pressing friction or adhesive connection. At the same time, the flanged 212 increases the contact area between the pot body 1 and the first substrate 21, which is beneficial for heat transfer.

[0048] In some embodiments, the height of the flange 212 is set to 0.5mm~1.5mm, preferably 0.8mm~1.2mm, because if the height of the flange 212 is too low, the anchoring force will be insufficient, while if it is too high, it may puncture the bottom of the pot or cause the pot body 1 to deform. During the pressing process, it is necessary to ensure that the pressing force can make the flange 212 completely embedded in the bottom of the pot body 1, so as to ensure a stable and tight connection between the electromagnetic induction pot bottom assembly 2 and the pot body 1.

[0049] In other embodiments, a process of punching holes first and then stretching the flange 212 separately can be adopted. Although this increases the number of steps, this process can control more complex flange 212 shapes, such as forming flange 212 structures with barbs or forks, which can make the electromagnetic induction pot bottom assembly 2 and the pot body 1 more anchored after pressing.

[0050] The through holes 211 are arranged in a regular array on the first substrate 21. The array includes a honeycomb array, a concentric ring array, or a rectangular array. In this embodiment, a concentric ring array is used, which is more suitable for a round pot bottom. This array method is evenly distributed in the radial and circumferential directions, which is conducive to the uniform conduction of heat from the center to the surrounding area. Of course, in other embodiments, a honeycomb array or a rectangular array can also be used for a round or square pot bottom. Among them, the honeycomb array has the highest space utilization and open area ratio with the same hole spacing, reduces the weight the most, and has good isotropy. The rectangular array is simple to design, easy to mold, and low in cost. Regardless of which array arrangement is used, when setting through holes 211 on the first substrate 21, it is necessary to take into account both structural strength and connection strength. The optimal open area ratio is generally set at 30% to 50%.

[0051] In other embodiments, a spiral array can also be used, with the through holes 211 distributed outward from the center along the Archimedean spiral. In this way, heat is conducted along the spiral, which can guide the heat flow to generate micro-circulation and make the heating more uniform.

[0052] In this embodiment, the outer contours of the first substrate 21 and the second substrate 22 are the same and are fixedly connected by laser welding, thereby forming a plurality of continuous welds and / or a plurality of spot welds on them, and the side of the first substrate 21 with the flange 212 is away from the second substrate 22.

[0053] This embodiment uses laser welding, which results in a small heat-affected zone and minimal deformation, maintaining the flatness of the first substrate 21 and the second substrate 22. After welding, the two substrates become a single component, facilitating subsequent automated assembly and pressing with the pot body 1. This embodiment also uses spot welding, with the welding position selected within a non-porous area enclosed by several through holes 211. This creates a relatively uniform array of weld points across the entire substrate, ensuring the stability of the connection between the two substrates and the uniformity of the structure, resulting in more uniform heat conduction.

[0054] like Figures 7 to 12 As shown, this application also provides a method for processing energy-saving cookware, which includes the following steps: Step A: Align and stack the first substrate 21 and the second substrate 22 onto the laser welding equipment 4, and weld and fix the first substrate 21 and the second substrate 22 by the laser welding equipment 4 to form the electromagnetic induction pot bottom assembly 2; wherein, the first substrate 21 and the second substrate 22 form a number of spot welds by the laser welding equipment 4, and any spot weld is located in the non-porous area surrounded by a number of through holes 211; Step B: Place the blank 3 in the pressing equipment 5 and place the electromagnetic induction pot bottom assembly 2 in the assembly groove 31 of the blank 3. The pressing equipment 5 presses and fixes the electromagnetic induction pot bottom assembly 2 and the blank 3 to form a cookware blank. During the pressing process, the pressing equipment 5 runs continuously. In the early stage of pressing, the pressing equipment 5 pre-presses the electromagnetic induction pot bottom assembly 2 into the assembly groove 31 of the blank 3, so that the flange 212 on the first substrate 21 is initially embedded in the bottom of the assembly groove 31. In the later stage of pressing, the pressing equipment 5 continues to apply pressure, so that the flange 212 on the first substrate 21 is completely embedded in the bottom of the assembly groove 31. Step C: The cookware blank is stamped into the shape of a cookware and machined to optimize its appearance. The machining includes trimming the edge of the pot rim and precision machining the edge of the electromagnetic induction pot bottom assembly 2. By trimming the edge of the pot rim, excess burrs or waste are removed to make the pot rim flat. By precision machining the edge of the electromagnetic induction pot bottom assembly 2, burrs or protrusions are removed to make it smoothly transition with the pot body 1. Step D: Install the handle to complete the cookware.

[0055] Through the above steps, the electromagnetic induction pot bottom assembly 2 is first pre-welded to prevent the two substrates from sliding relative to each other during pressing. Then, the entire assembly is pressed and stamped, which allows the material of the pot body 1 and the flange 212 to flow and fit together fully, improving the bonding strength. During the pressing process, the electromagnetic induction pot bottom assembly 2 is gradually pressurized to prevent the flange 212 from bending or breaking due to sudden impact, ensuring complete embedding. Finally, machining is performed to ensure that the pot opening is flat and that the edge of the electromagnetic induction pot bottom assembly 2 smoothly transitions to the pot body 1, optimizing the overall appearance. At this point, the entire pot is formed, and the complete pot is formed by installing the handle and other accessories.

[0056] In the above processing, the cookware can also be monitored online and surface treated. In some embodiments, an ultrasonic flaw detection or thermoforming detection step can be added after step B to check the uniformity of the flange 212 embedding and the internal voids. In other embodiments, the pot body 1 can be anodized (aluminum pot) or electropolished (stainless steel pot) after step C to improve corrosion resistance and aesthetics.

[0057] In other embodiments, the processing sequence of this embodiment may not be used. For example, it may be changed to: a processing method for energy-saving cookware, which includes the following steps: Step A: Align and stack the first substrate 21 and the second substrate 22 onto the laser welding equipment 4, and weld and fix the first substrate 21 and the second substrate 22 by the laser welding equipment 4 to form the electromagnetic induction pot bottom assembly 2; wherein, the first substrate 21 and the second substrate 22 form a number of spot welds by the laser welding equipment 4, and any spot weld is located in the non-porous area surrounded by a number of through holes 211; Step B: The blank 3 is stamped into the shape of a cookware and then machined to optimize its appearance; the machining includes trimming the rim of the cookware, removing excess burrs or waste material from the rim to make the rim flat. Step C: Place the stamped blank 3 into the pressing equipment 5, and place the electromagnetic induction pot bottom assembly 2 into the assembly groove 31 of the blank 3. The pressing equipment 5 presses and fixes the electromagnetic induction pot bottom assembly 2 and the blank 3 to form a pot. During the pressing process, the pressing equipment 5 runs continuously. In the early stage of pressing, the pressing equipment 5 pre-presses the electromagnetic induction pot bottom assembly 2 into the assembly groove 31 of the blank 3, so that the flange 212 on the first substrate 21 is initially embedded into the bottom of the assembly groove 31. In the later stage of pressing, the pressing equipment 5 continues to apply pressure, so that the flange 212 on the first substrate 21 is completely embedded into the bottom of the assembly groove 31. Step D: Precision process the edge of the electromagnetic induction pot bottom assembly 2. By precision processing the edge of the electromagnetic induction pot bottom assembly 2, remove edge burrs or protrusions so that it can smoothly transition with the pot body 1. Step E: Install the handle to complete the cookware.

[0058] By using the above processing method, the pot body 1 is first stamped and formed, and then the electromagnetic induction pot bottom component 2 is pressed into the already formed pot bottom assembly groove 31. This can avoid the edge of the electromagnetic induction pot bottom component 2 from lifting due to secondary stamping. However, the already formed pot body 1 is difficult to position and support, and is prone to deformation during pressing. Those skilled in the art can select the process sequence according to the actual situation.

[0059] In addition, for some coated pots, after the pot processing is completed, the surface can be degreased, sandblasted, or acid-etched to remove oxide scale and oil stains and form a micro-rough surface. A primer coating material is sprayed or dipped onto the pretreated surface. The primer coating is a high-temperature resistant adhesive. After the primer coating is semi-dry or fully cured, a non-stick topcoat is applied. The topcoat material is a fluoropolymer or ceramic-based non-stick material. The coated pot is then sent into a sintering furnace and sintered according to a specific temperature curve to cure the coating and firmly bond it to the substrate. The coating process is a mature existing technology and will not be described in detail in this application. Those skilled in the art can refer to the existing technology and combine it with the pots of this application to make a reasonable process selection.

[0060] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. An energy-saving cookware, comprising a pot body, wherein the bottom of the pot body is formed with a flat bottom surface, characterized in that, It also includes an electromagnetic induction pot bottom assembly composited on the outer side of the bottom surface. The electromagnetic induction pot bottom assembly includes: a first substrate, which is composited on the outer side of the bottom surface and has a plurality of through holes thereon; and a second substrate, which is composited on the outer side of the first substrate and has a flat surface on the side away from the pot body.

2. The energy-saving cookware as described in claim 1, characterized in that, The first substrate has the through hole formed by punching, and a flange is formed simultaneously on the edge of the through hole during the punching process. The protruding direction of the flange is the same as the punching direction. The flange is configured to be embedded in the bottom of the pot body when the electromagnetic induction pot bottom assembly is pressed with the pot body to achieve a fixed connection with the pot body.

3. The energy-saving cookware as described in claim 1, characterized in that, The through holes are arranged in a regular array on the first substrate, and the array includes a honeycomb array, a concentric ring array, a rectangular array, or a spiral array.

4. An energy-saving cookware as described in claim 2, characterized in that, The first substrate and the second substrate have the same outer contour and are fixedly connected by laser welding, thereby forming a plurality of continuous welds and / or a plurality of spot welds on them, and the side of the first substrate with the flange is away from the second substrate.

5. An energy-saving cookware as described in claim 1, characterized in that, The pot body is integrally formed from a blank by stamping. The blank has an assembly groove in the middle. The electromagnetic induction pot bottom assembly is fixedly connected in the assembly groove. The outline of the assembly groove is adapted to the outline of the electromagnetic induction pot bottom assembly.

6. An energy-saving cookware as described in claim 5, characterized in that, After the blank is pressed with the electromagnetic induction pot bottom assembly, the side of the second substrate away from the first substrate is flush with the surface of the blank.

7. A method for processing energy-saving cookware, characterized in that, The process for manufacturing energy-saving cookware as described in any one of claims 1 to 6 includes the following steps: Step A: Aligning and stacking a first substrate and a second substrate on a laser welding device, and welding and fixing the first substrate and the second substrate together using the laser welding device to form an electromagnetic induction pot bottom assembly; Step B: Placing the blank in a pressing device and placing the electromagnetic induction pot bottom assembly in the assembly groove of the blank, and pressing and fixing the electromagnetic induction pot bottom assembly and the blank together using the pressing device to form a cookware blank; Step C: Stamping the cookware blank into the shape of a cookware and machining it to optimize the appearance; Step D: Installing a handle to form a complete cookware.

8. The processing method of an energy-saving cookware as described in claim 7, characterized in that, In step A, the first substrate and the second substrate form several spot welds using a laser welding device. Each spot weld is located within a non-hole area enclosed by several through holes.

9. The processing method of an energy-saving cookware as described in claim 7, characterized in that, In step B, the pressing equipment operates continuously. In the initial stage of pressing, the pressing equipment pre-presses the electromagnetic induction pot bottom assembly into the assembly groove of the blank, so that the flange on the first substrate is initially embedded in the bottom of the assembly groove. In the later stage of pressing, the pressing equipment continues to apply pressure, so that the flange on the first substrate is completely embedded in the bottom of the assembly groove.

10. The processing method of an energy-saving cookware as described in claim 7, characterized in that, The machining in step C includes trimming the rim of the pot and precision machining the edge of the electromagnetic induction pot bottom assembly. Trimming the rim removes excess burrs or waste material to make the rim flat. Precision machining the edge of the electromagnetic induction pot bottom assembly removes burrs or protrusions to make it transition smoothly with the pot body.

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