Processing method of aluminum plate for cooking utensil and aluminum pot with thickened pot opening
The aluminum sheet is processed by forward hot rolling and cold rolling, and the problem of high ear making rate of aluminum pot and inability to make aluminum pots with thickened mouths is solved, which significantly reduces ear making rate and efficient processing of thickened mouths is achieved, which improves the durability of aluminum pots and reduces costs.
Patent Information
- Application Number
- CN202510096044.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-04-22
AI Technical Summary
Existing aluminum pans are prone to ear making during deep-draining, resulting in high processing costs and waste of materials, and it is impossible to make aluminum pans with thickened pot mouths through deep-draining.
The aluminum plate is processed by forward hot rolling and cold rolling. The thickness of the aluminum plate after hot rolling is controlled to not exceed 8 mm, and the forward cold rolling is performed at least once at room temperature. The cold rolling processing amount is at most 5 mm, and then annealing is carried out.
The ear-making rate is significantly reduced to 1-2%, realizing the direct processing of an aluminum pot with thickened pot mouth during the stamping process, improving the durability and strength of the pot while reducing costs.
Smart Images
Figure CN119857720A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of aluminum plates, and in particular relates to a processing method of an aluminum plate for cooking utensils and an aluminum pot with a thickened pot mouth. Background Art
[0002] Aluminum pots are a common type of kitchenware, which are widely popular for their lightness, durability, fast heating, uniform heat conduction and no rust. Aluminum pots are mainly divided into refined aluminum (soft aluminum) products and cast aluminum (hard aluminum) products, and the materials are mainly aluminum and aluminum alloys. The surface color of aluminum pots varies, and the common ones are white and light yellow. White aluminum products are divided into two types: casting and stamping. The surface of stamped aluminum products has a natural oxide film, while yellow aluminum products are anodized to form an artificial oxide film on the surface, which has good corrosion resistance and wear resistance.
[0003] In the process of making aluminum pots, deep stamping is used to shape the pot body; however, in the prior art, during this deep stamping process, ear-forming phenomenon may occur (i.e., a wavy protrusion is formed on the edge of the pot mouth), and the ear-forming part needs to be cut off to obtain a pot with a flat pot mouth, resulting in high processing costs and waste of materials.
[0004] In addition, the thickening of the pot mouth can improve the durability and strength of the pot, making the pot more durable; currently, the thickening of the pot mouth is mainly made by casting, but the production cost is relatively high. If the aluminum pot with a thickened pot mouth is made by deep stamping, the thickened part will appear at the ear-making part due to the wave-shaped protrusion formed on the edge of the pot mouth. Since the ear-making part needs to be cut off, it is impossible to use stamping technology to make a pot with a thickened pot mouth. Summary of the invention
[0005] The invention provides a processing method of an aluminum plate for cooking utensils and an aluminum pot with a thickened pot mouth, aiming to solve the technical problem of high ear making rate of aluminum pots in the prior art.
[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0007] In a first aspect, the present invention provides a method for processing an aluminum plate for a cooking utensil, comprising:
[0008] S1. hot-rolling the aluminum billet to obtain an aluminum plate, wherein the thickness of the aluminum plate after hot-rolling is at most 8 mm;
[0009] S2, cooling the aluminum sheet after hot rolling naturally and then cold shearing;
[0010] S3, keep the aluminum plate after cold shearing in the same direction as during hot rolling, and perform at least one forward cold rolling at room temperature to the aluminum plate of finished thickness, and the forward cold rolling processing amount is at most 5mm;
[0011] S4. Annealing the cold-rolled aluminum sheet to obtain an aluminum sheet for cooking utensils.
[0012] In a preferred embodiment, the aluminum billet is obtained by melting aluminum ingots, casting billets, and sawing billets, and the aluminum billet has several size specifications.
[0013] Based on the above solution, during the production process, the production of sawn blanks of different sizes can be flexibly adjusted according to demand to meet the needs of different customers, improve production efficiency and response speed, adapt to various application scenarios, and provide a wider range of product choices.
[0014] In a preferred embodiment, the aluminum billet is put into the furnace vertically for homogenization, and the oxide layer on the surface of the aluminum billet after homogenization is scraped off before forward hot rolling.
[0015] Preferably, in step S2, the hot rolling temperature is 380-420°C.
[0016] Based on the above scheme, at a hot rolling temperature of 380-420°C, defects inside the aluminum billet, such as holes and cracks, can be reduced, the integrity of the aluminum billet can be improved, and at the same time, the deformation resistance of the aluminum billet can be reduced, the required rolling force can be reduced, and energy consumption can be reduced.
[0017] Preferably, the cold shear is arranged at the end of the track of the hot shear.
[0018] Based on the above scheme, cold shearing is located after hot shearing, and precise shearing is performed after the material cools down, reducing the thermal impact, avoiding the high temperature after hot shearing affecting the shearing quality and accuracy of the material, and ensuring the flatness and quality of the shearing surface. In addition, the cold pass link is omitted, reducing the residence time of the material on the production line, directly transitioning from hot rolling to shearing, reducing the material handling and waiting time between different equipment, and speeding up the production rhythm.
[0019] In a preferred solution, in step S3, the cold-sheared aluminum sheet is cold-rolled in three passes on three rolling mills.
[0020] Based on the above scheme, the aluminum sheet after cold shearing is cold rolled in three passes on three rolling mills, which can make full use of the limited reduction amount, improve the uniformity and dimensional accuracy of the material by gradually reducing the thickness of the sheet, and improve the material performance and surface quality. This step-by-step rolling method has strong adaptability, can accurately control the reduction amount, reduce material waste, improve production efficiency, and ensure that the product has a high degree of consistency to meet the strict standards in industrial production.
[0021] In a preferred embodiment, in step S3, the hot-rolled aluminum sheet is naturally cooled and then cold-sheared into an aluminum sheet of a set size.
[0022] Based on the above scheme, the aluminum sheet after hot rolling is naturally cooled and then cold sheared, which can improve the hardness and strength of the material, thereby reducing the elastic deformation of the material during the cold shearing process and improving the shearing accuracy and efficiency. In addition, the cooled sheet is easier to control the size, so cold shearing is a set size of aluminum sheet, which helps to improve the efficiency of cold rolling and punching processing and reduce the scrap rate during the processing. At the same time, the precise cold shearing size helps to improve the material recovery rate and reduce material waste, thereby reducing costs and improving production efficiency.
[0023] According to a preferred solution, in step S3, an automatic feeder is used to feed the aluminum plate to obtain aluminum discs.
[0024] Based on the above solution, the automatic feeder is used to unload the aluminum sheet, which not only improves production efficiency, but also effectively solves the problem of punching double-row discs through the deflection function, theoretically increasing the material collection rate by 5-10 percentage points. In addition, the continuous machine operation reduces the number of times the aluminum sheet is handled during the rolling process, reducing the risk of damage to the surface of the aluminum sheet. The finished product after fine rolling is directly connected to the leveling machine, which effectively solves the flatness problem of the plate and further improves the overall quality and production efficiency of the product.
[0025] Preferably, the automatic feeder is a visual deflection feeder.
[0026] Based on the above solution, the visual system is used for precise positioning to ensure that the unloading position of the aluminum plate is accurate. The visual system can adapt to aluminum plates of different sizes and shapes, providing a flexible unloading solution.
[0027] In a second aspect, the present invention provides an aluminum pot with a thickened pot mouth, which is formed by stamping an aluminum sheet obtained by any of the processing methods for an aluminum sheet for cooking utensils described in the first aspect.
[0028] The beneficial effects of the present invention are:
[0029] 1. The present invention uses the method of direct hot rolling to perform preliminary processing on the aluminum sheet blank, and combines it with controlling the amount of cold rolling processing to reduce the earing rate to 1-2%, thereby achieving a significant reduction in the earing rate. Reducing the earing rate allows the aluminum sheet to be directly processed into a pot with a thickened pot mouth during stamping. Experiments have shown that direct hot rolling can effectively control the internal structure and surface quality of the material, and the earing rate can be reduced; the present invention further optimizes the amount of cold rolling processing, by increasing the amount of hot rolling processing and controlling the thickness of the aluminum sheet after hot rolling to not exceed 8mm, while controlling the amount of cold rolling processing to less than 5mm, so that the earing rate is further reduced, and by combining the two methods of direct hot rolling and reducing the amount of cold rolling processing, the earing rate is reduced to 1-2%. Reducing the earing rate is also conducive to reducing material waste and improving processing accuracy, which reduces costs while ensuring the quality of the aluminum pot.
[0030] In addition, when the aluminum plate produced by the present invention is deep-stamped to form a thickened pot mouth, a pot with a thickened pot mouth can be processed at one time, and the edge of the pot mouth is flush and the height is consistent, thereby improving the durability and strength of the pot and making the pot more solid and durable.
[0031] 2. In addition, the present invention performs forward rolling during hot rolling and cold rolling, and the direction remains consistent. This is because the internal structure and mechanical properties of the aluminum plate will be affected by the processing direction during the hot rolling process. By maintaining a consistent direction of rotation, the mechanical properties of the material during the cold rolling process can be ensured to be uniform, and stress concentration caused by uneven rolling force can be avoided, thereby preventing performance differences due to changes in direction and ensuring the smoothness of the pot mouth of the final product. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0033] Figure 1 This is a picture of the aluminum pot made in comparison group 1.
[0034] Figure 2 This is a picture of the aluminum pot made by the comparison group 2-4.
[0035] Figure 3 This is a diagram of an aluminum plate obtained by the optimized group rolling provided by the present invention.
[0036] Figure 4 This is a diagram of an aluminum pot obtained by stamping the optimization group provided by the present invention.
[0037] Figure 5 This is a diagram of thickening the mouth of an aluminum pot made by the optimization group provided by the present invention. DETAILED DESCRIPTION
[0038] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention.
[0039] Embodiment 1:
[0040] like Figure 1 As shown, this embodiment provides a method for processing an aluminum plate for a cooking utensil and an aluminum pot, comprising:
[0041] S1. hot-rolling the aluminum billet to obtain an aluminum plate, wherein the thickness of the aluminum plate after hot-rolling is at most 8 mm;
[0042] S2, cooling the aluminum sheet after hot rolling naturally and then cold shearing;
[0043] S3, keep the aluminum plate after cold shearing in the same direction as during hot rolling, and perform at least one forward cold rolling at room temperature to the aluminum plate of finished thickness, and the forward cold rolling processing amount is at most 5mm;
[0044] S4. Annealing the cold-rolled aluminum sheet to obtain an aluminum sheet for cooking utensils.
[0045] The aluminum billet is obtained by melting, casting and sawing aluminum ingots, and the aluminum billet has several sizes. The aluminum billet is put into the furnace vertically for homogenization, and the oxide layer on the surface of the homogenized aluminum billet is removed before forward hot rolling.
[0046] Specifically, the cast aluminum ingots can be cut into small aluminum ingots of different sizes, which can be 370*800*120mm, 400*800*120mm, 430*800*120mm, 460*800*120mm, 490*800*120mm, 520*800*120mm or 550*800*120mm, so that the production of sawn blanks of different sizes can be flexibly adjusted according to demand during the production process.
[0047] In step S2, the hot rolling temperature is 380-420°C.
[0048] Specifically, the hot rolling temperature may be 380°C, 400°C, 410°C or 420°C, etc. A preferred solution: the hot rolling temperature is 400°C.
[0049] The cold shear is arranged at the end of the track of the hot shear, and the aluminum sheet formed by hot rolling is naturally cooled and then cold sheared into an aluminum sheet of a set size.
[0050] Specifically, the aluminum billet is rolled through a hot rolling mill to form the required preliminary sheet shape. The hot-rolled aluminum sheet is initially cooled naturally during transportation to reduce the sheet temperature and reduce thermal effects. Cold shearing equipment is installed at the end of the hot rolling production line to prepare for shearing the sheet. After the sheet reaches the appropriate temperature, it is immediately sheared by cold shearing to avoid a long natural cooling process. According to the specifications of the cold rolling and punching processes, the sheet is sheared into a slab of appropriate length to reduce material waste in subsequent processing.
[0051] In step S3, the cold-sheared aluminum sheet is cold-rolled in three passes on three rolling mills.
[0052] Specifically, the aluminum sheet after cold shearing first enters the first cold rolling mill for the first pass of rolling. In this step, considering that the hot-rolled sheet has little reduction left for cold rolling, the first pass of rolling needs to accurately control the reduction, which is usually equivalent to the reduction of the cold pass, and it is appropriate to reduce about 600-700 wires. This helps to ensure that the sheet gradually adapts to the cold rolling process while avoiding excessive deformation. Subsequently, the sheet enters the second rolling mill for the second pass of rolling to continue to refine the grains and improve the surface quality of the sheet. The rolling at this stage also requires precise control to achieve uniform material deformation. After the second pass of rolling, the thickness and performance of the sheet are further improved. Finally, the sheet enters the third rolling mill for the final finishing rolling to complete the three passes of cold rolling.
[0053] In step S3, an automatic feeder is used to feed the aluminum plate to obtain aluminum discs.
[0054] Wherein, the automatic feeder is a visual deflection feeder.
[0055] Specifically, a visual yaw feeder is used for aluminum plate stamping. First, the cold-rolled aluminum plate is loaded into the machine, and the visual system is used for precise positioning to ensure that the stamping position of each aluminum plate is accurate. The yaw function of the visual yaw feeder is particularly suitable for punching double-row discs. Continuous stamping is achieved through automated control. During the stamping process, the feeding and stamping parameters are optimized to reduce material waste and improve the material recovery rate. The finished product after fine rolling directly enters the leveling machine for flatness treatment to ensure that the flatness of the plate meets the requirements of subsequent processing. Subsequently, the aluminum discs obtained by stamping are annealed to eliminate processing stress and improve the plasticity of the material. The annealed aluminum discs are inspected to ensure that the quality meets the standards before being put into storage, waiting for stretching or other forming processes to complete the entire aluminum disc production process.
[0056] Embodiment 2:
[0057] The present embodiment provides an aluminum pot with a thickened pot mouth, which is formed by stamping an aluminum plate obtained by the processing method of an aluminum plate for cooking utensils described in any one of the first embodiments.
[0058] The following are the specific steps of a method for processing an aluminum plate for cooking utensils in this embodiment:
[0059] S1. Melting: Put the aluminum ingot into a high-temperature furnace for melting to form liquid aluminum.
[0060] S2, Casting: Pour the molten aluminum into a mold of a specific size for cooling and forming. According to production requirements, the size of the casting mold is adjusted from 550*120mm to 800*120mm to meet the production requirements of different pots.
[0061] S3, sawing: cutting the cast aluminum ingot into small aluminum ingots of different specifications. Adjust the cutting size from a single size of 550*800*120mm to multiple fixed sizes (370*800*120mm to 640*800*120mm) to meet diverse production needs.
[0062] S4. Homogenization: Change the way the aluminum billet enters the furnace from horizontal to vertical, so as to refine the internal crystal structure of the aluminum billet, improve the surface smoothness and eliminate the orange peel phenomenon.
[0063] S5, Faceting: Remove the oxide layer on the surface of the aluminum billet to make the surface smoother and brighter.
[0064] S6, hot rolling: the aluminum billet after face cutting is turned 90 degrees and sent to the hot rolling mill for pressing and rolling at high temperature (400℃), so that the aluminum billet is easier to flatten into aluminum sheet and easy to shape. The change of hot rolling width ensures that all sheets can be rolled smoothly in the future.
[0065] S7, Cold shearing: After hot rolling, cold shearing is immediately carried out to cut aluminum plates of various specifications and sizes. By installing cold shears at the end of the track after hot rolling, the cold pass link is omitted, which improves efficiency and reduces material waste.
[0066] S8, cold rolling: the aluminum plate after cold shearing is rolled again at room temperature to reach the specified thickness. Considering the surface protection and improving the material collection rate, the handling of the plate is minimized during the cold rolling process. The continuous rolling method is adopted, and the rolling is completed in three passes with three rolling mills.
[0067] S9, Feeding: Use visual deflection feeder to improve the efficiency and accuracy of punching. The deflection function provides an efficient solution for punching double-row discs, which can theoretically increase the material collection rate by 5-10 percentage points and reduce the handling and surface damage of aluminum sheets during the rolling process.
[0068] S1 0. Annealing and inspection: After cutting, the aluminum discs are annealed and put into storage after passing the inspection, ready to enter the next process.
[0069] The present invention will be further explained below in conjunction with specific experiments:
[0070] 1. Experimental design
[0071] The present invention designs comparison groups 1-4 and optimization groups:
[0072] See Table 1 for specific differences.
[0073] Table 1 Differences between the comparison group and the optimization group
[0074] the difference Rolling method Thickness of aluminum sheet after hot rolling / mm Cold rolling processing amount / mm Ear making rate Comparison group 1 Ordinary rolling 9 6 6.8％ Comparison group 2 Forward rolling 9 6 5.7％ Comparison group 3 Forward rolling 11 8 6.2％ Comparison group 4 Ordinary rolling 8 5 3.9％ Optimization Group Forward rolling 8 5 1.2％
[0075] Note: Ordinary rolling means that the directions of hot rolling and cold rolling are inconsistent; forward rolling means that the directions of hot rolling and cold rolling are always consistent.
[0076] 2. Test results
[0077] The comparison group 1-4 and the optimization group were used to stamp aluminum pots. The test results are shown in Figure 1-Figure 3 ,in, Figure 1 To compare the test results of group 1, Figure 2 A, B, and C are the test results of comparison group 3, comparison group 2, and comparison group 4 respectively. Figure 3 and Figure 4 All are the results of the optimization group. In this aluminum plate processing technology test, we conducted a detailed evaluation of the processing methods of comparison groups 1 to 4 and compared them with the process of the optimization group. The following is a summary and analysis of the test results of each group:
[0078] Note: Earing rate = (H max -H min )*100% / H 均
[0079] H max : The average height of all ear wave peaks in the pot body; H min The average height of all the troughs in the pot; H 均 The height of the pot.
[0080] Comparison group 1 ( Figure 1 ) and control group 2 ( Figure 2 B) By using different rolling methods, the earing rate dropped from 6.8% to 5.7%, indicating that the forward rolling is beneficial to reducing the earing rate.
[0081] Comparison group 2 ( Figure 2 B) and control group 3 ( Figure 2 A) Although the same forward rolling method was used, the cold working amount of comparison group 3 was 2mm higher than that of comparison group 2, and the earing rate was increased from 5.7% to 6.2%; and although comparison group 4 used ordinary rolling compared to comparison group 3, the cold working amount of comparison group 4 was only 5mm, 3mm less than that of comparison group 3, which reduced the earing rate of comparison group 4 from 6.2% to 3.9%. The optimization group combined the conclusions drawn from comparison groups 1 and 2: the rolling method can effectively reduce the earing rate, and the conclusions drawn from comparison groups 2-4: reducing the cold rolling amount can significantly reduce the earing rate. Forward rolling was selected, the thickness of the aluminum plate after hot rolling did not exceed 8mm, and the cold rolling amount was controlled below 5mm, successfully reducing the earing rate to 1.2%.
[0082] Through comparative analysis, the following conclusions are drawn:
[0083] The combination of forward rolling, controlling the thickness of the aluminum sheet after hot rolling to no more than 8mm, and controlling the cold rolling processing amount to less than 5mm can significantly reduce the earing rate, so that the aluminum sheet can be directly thickened during the stamping process.
[0084] The present invention uses the aluminum plate prepared by the optimized production method to prepare the aluminum pan. The test results refer to Figure 5 The key lies in the use of forward rolling technology, strict control of the thickness of the aluminum plate after hot rolling to no more than 8mm, and the reduction of the cold rolling processing amount to less than 5mm, which significantly reduces the ear-making rate, and the thickened edge of the pot mouth is flush and the height is consistent, ensuring the overall quality and structural uniformity of the aluminum pot, while reducing material waste, reducing the defective rate and saving costs.
[0085] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.
Claims
1. A method for processing an aluminum plate for cooking utensils, characterized in that: include: S1. hot-rolling the aluminum billet to obtain an aluminum plate, wherein the thickness of the aluminum plate after hot-rolling is at most 8 mm; S2, cooling the aluminum sheet after hot rolling naturally and then cold shearing; S3, keep the cold sheared aluminum sheet in the same direction as that during hot rolling, and perform at least one forward cold rolling at room temperature to the finished thickness of the aluminum sheet, and the forward cold rolling processing amount is at most 5mm; S4. Annealing the cold-rolled aluminum sheet to obtain an aluminum sheet for cooking utensils.
2. The method for processing an aluminum plate for cooking utensils according to claim 1, characterized in that: The aluminum billet is obtained by melting, casting and sawing aluminum ingots, and the aluminum billet has several size specifications.
3. The method for processing an aluminum plate for cooking utensils according to claim 2, characterized in that: The aluminum billet is put into the furnace vertically for homogenization, and the oxide layer on the surface of the homogenized aluminum billet is scraped off before forward hot rolling.
4. The method for processing an aluminum plate for cooking utensils according to claim 3, characterized in that: In step S2, the hot rolling temperature is 380-420°C.
5. The method for processing an aluminum plate for cooking utensils according to claim 1, characterized in that: The cold shear is arranged at the end of the hot-rolled track.
6. The method for processing an aluminum plate for cooking utensils according to claim 1, characterized in that: In step S3, the cold-sheared aluminum sheet is cold-rolled in three passes on three rolling mills.
7. The method for processing an aluminum plate for cooking utensils according to claim 1, characterized in that: In step S3, the aluminum sheet formed by hot rolling is naturally cooled and then cold sheared into an aluminum sheet of a set size.
8. The method for processing an aluminum plate for cooking utensils according to claim 1, characterized in that: In step S3, an automatic feeder is used to feed the aluminum plate to obtain aluminum discs.
9. The method for processing an aluminum plate for cooking utensils according to claim 8, characterized in that: The automatic feeder is a visual deflection feeder.
10. An aluminum pot with a thickened pot mouth, characterized in that: The aluminum sheet is obtained by stamping using the aluminum sheet processing method for cooking utensils according to any one of claims 1 to 9.