Double-layer vacuum tea making cup and manufacturing process thereof

Abstract

The double-layer vacuum tea making cup comprises a shell, an inner container, a vacuum bottom and an outer bottom, the shell and the inner container are of a cup-shaped structure which is coaxially arranged in a sleeved mode, and a closed vacuum heat insulation cavity is formed between the shell and the inner container; the vacuum bottom is hermetically welded at the bottom opening of the shell; the outer sole is fixedly welded on the outer side of the vacuum sole; the shell is matched with the upper portion of the corresponding side wall of the inner container to form a water outlet spout structure. The technical defects of a titanium tea making cup spout structure are overcome, through the integrated spout structure formed by the shell and the inner container in a matched mode, the leakage risk of a split welding spout is avoided, and the size precision and consistency of spout machining are guaranteed; meanwhile, shape adjustment is achieved through stamping deformation in spout forming, material cutting or splicing or loss is avoided, the high-precision forming target that the closed cross section of the cup body is variable in shape and the perimeter is constant is achieved, and the overall structural strength of the cup body is reserved to the maximum extent while the machining precision is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of tea brewing cup technology, and in particular to a double-walled vacuum tea brewing cup and its manufacturing process. Background Technology

[0002] With the technological advancements in the daily-use beverage industry, consumers have placed higher demands on the material safety, functionality, and structural durability of drinking utensils. Double-walled vacuum cups, with their excellent heat insulation, temperature retention, and cold retention properties, have become the mainstream structural form for tea and water brewing utensils. Among them, industrial pure titanium TA1 material, due to its excellent biocompatibility, corrosion resistance, lightweight yet high strength, and lack of heavy metal leaching, is finding increasingly widespread application in high-end tea cup products.

[0003] In existing technologies, the core structure of a double-walled vacuum tea cup typically includes an outer shell, an inner liner, a vacuum bottom, and an outer bottom component. To meet the water output requirements of tea brewing, the cup body needs to be equipped with a spout structure. The molding precision and structural stability of the spout, along with its fit with the cup body, directly determine the product's water output performance and overall yield. However, pure titanium material itself is difficult to mold. During cold processing such as stretching and stamping, problems such as blank cracking, wrinkling, and uneven deformation are prone to occur. In particular, the molding process of irregularly shaped cups with spouts has become a core industry pain point restricting the large-scale production of titanium tea cups.

[0004] Currently, the forming process for titanium teapot spouts in the industry mainly falls into two mainstream categories: The first involves first stretching the entire cup body and then separately assembling the spout component through welding. While this process reduces the difficulty of stretching the cup body, it suffers from poor consistency between the spout and the cup body, and leaks are prone to occur at the welding points, directly leading to substandard product sealing performance and a high rate of welding scrap. The second method involves simultaneously stamping the spout during the cup body stretching process. This process ensures the integrity of the spout and the cup body and avoids the risk of welding leaks. However, the existing mold design and process planning for this type of process have significant flaws. The irregular cross-sections of the blank have sharp angles, resulting in severely uneven material stress during stamping deformation. This makes it unsuitable for efficient and stable stretching operations, leading to frequent defects such as blank cracking and wrinkling, making it difficult to guarantee product yield and production efficiency.

[0005] In addition, the existing titanium double-walled vacuum tea cups have many technical shortcomings in their structure and process design: at the structural design level, some cup surfaces have complex shapes with large differences in concavity and convexity, and the radius of the rounded corners is not uniform. In the subsequent polishing process, the mold cannot fit the cup surface throughout the process, forming a large number of polishing dead corners. This not only greatly reduces the efficiency of the polishing operation, but also fails to ensure the uniformity of the surface finish of the cup, affecting the product's appearance quality and user experience. At the material forming process level, the existing irregular cup cross-section reconstruction process mostly requires material cutting and splicing to achieve shape adjustment. This not only causes unnecessary waste of raw materials, but also damages the overall structural strength of the cup, making it impossible to achieve the high-precision forming goal of variable cup body closed cross-section shape with constant perimeter.

[0006] In summary, the existing structure and manufacturing process of titanium double-walled vacuum tea cups have many defects, such as poor molding adaptability and low yield of finished products, which seriously restrict the large-scale production of titanium double-walled vacuum tea cups. Therefore, it is necessary to improve the above-mentioned problems. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies, such as poor molding adaptability and low finished product yield, by providing a new double-layer vacuum tea cup and its manufacturing process.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A double-walled vacuum tea cup includes an outer shell, an inner liner, a vacuum bottom, and an outer bottom. The outer shell and the inner liner are coaxially fitted into a cup-shaped structure, forming a sealed vacuum insulation chamber between them. The vacuum bottom is sealed and welded to the bottom opening of the outer shell to seal the vacuum insulation chamber. The outer bottom is fixedly welded to the outside of the vacuum bottom. The upper part of the corresponding side wall of the outer shell and the inner liner are matched to form a spout structure.

[0009] The coaxial sleeve design ensures a uniform circumferential gap between the outer shell and the inner liner, creating a stable and uniform vacuum insulation chamber. This maximizes the thermal barrier effect of the vacuum layer, effectively blocking heat conduction and convection between the inner cavity and the outer shell, resulting in excellent heat and cold insulation performance. The coaxial sleeve structure also ensures precise coaxial alignment of the spout between the outer shell and the inner liner, significantly reducing spout misalignment and minimizing welding scrap and defect rates caused by misalignment or excessive gaps.

[0010] The spout structure is integrally formed by matching the outer shell and inner liner at corresponding positions, realizing an integrated structural design of the spout and the cup body. This completely avoids the defects such as welding leakage and insufficient joint strength caused by separate welding of the spout in the existing technology, fundamentally solving the problem of sealing failure at the spout position and ensuring the overall sealing performance and safety of the cup body.

[0011] This invention overcomes the technical shortcomings of titanium teapot spout structure. By forming an integrated spout structure with the outer shell and inner liner, it avoids the leakage risk of separate welded spouts and ensures the dimensional accuracy and consistency of spout processing. At the same time, the spout is formed by stamping deformation to adjust its shape, without material cutting, splicing or loss. This achieves the goal of high-precision forming of cup body with variable closed cross-sectional shape and constant perimeter, maximizing the preservation of the overall structural strength of the cup body while ensuring processing accuracy.

[0012] A manufacturing process for a double-walled vacuum tea brewing cup, used to manufacture the aforementioned double-walled vacuum tea brewing cup, includes the following steps: S1: Take TA1 sheet material and perform blanking, double stretching, stamping spout, wire cutting, punching, flanging, and flattening processes to obtain the shell semi-finished product; S2: Take TA1 sheet material, and carry out blanking, double stretching, stamping spout, shaping and wire cutting processes to obtain the inner liner semi-finished product; S3: Take TA1 sheet material and perform blanking, stretching, and flattening processes to obtain the vacuum sole; take TA1 sheet material and perform blanking, stretching, and flattening processes to obtain the outsole; S4: The inner liner semi-finished product is coaxially inserted into the outer shell semi-finished product. The spouts of the two are aligned and fitted together, and then the joint is fixed by welding. Then, the vacuum bottom is fitted and welded to the bottom opening of the outer shell semi-finished product. After vacuum degassing, a vacuum heat insulation chamber is formed. Then, the spout is stamped to produce the finished outer shell and inner liner. Then, the outer bottom is fitted and welded to the outside of the vacuum bottom. Finally, the bottom is welded as a whole to produce a double-layer vacuum tea cup.

[0013] Step S1 is used to obtain the semi-finished outer shell. Addressing the tendency of TA1 material to crack and wrinkle during cold working, a two-step stretching process is used instead of a single large-deformation stretching. This effectively disperses the deformation stress of a single stretch, ensuring uniform stress on the blank during stretching and avoiding defects such as cracking, uneven wall thickness, and wrinkling caused by excessive deformation in a single stretch. This significantly improves the yield of the outer shell stretching process and allows for precise control of the dimensions, roundness, and wall thickness uniformity of the outer shell, ensuring forming accuracy. Simultaneously, the spout is stamped during the semi-finished outer shell stage, achieving integrated forming of the spout and cup body. This completely avoids the leakage risk and insufficient bonding strength issues caused by subsequent separate welding of the spout. Furthermore, this process ensures the deformation compatibility between the spout forming and the cup body stretching process, resulting in a smooth transition without sharp angles in the irregular cross-section of the blank. The material is subjected to uniform stress during stamping deformation, achieving the processing goal of a variable cup body cross-sectional shape with a constant perimeter. There is no material cutting, splicing, or loss, ensuring the consistency of the spout processing in one step while fully preserving the overall structural strength of the cup body. The wire cutting process can precisely control the opening height and contour accuracy of the semi-finished shell, ensuring the flatness of the opening and the same height on both sides. This provides a precise dimensional reference for the subsequent coaxial fitting of the inner liner and the shell, and the alignment and fitting of the spout. It avoids problems such as excessive fitting gap and poor welding caused by the dimensional deviation of the opening, and effectively reduces the scrap rate of subsequent welding processes.

[0014] Step S2 is used to obtain the semi-finished inner liner. The two stretching processes are fully adapted to the two stretching processes of the outer shell, using step-by-step stretching to disperse deformation stress, adapting to the cold working characteristics of TA1 material, avoiding problems such as blank cracking, wrinkling, and uneven wall thickness. At the same time, it can precisely control the cup size of the inner liner, ensuring uniform coaxial fitting gap between the inner liner and the outer shell, providing a core foundation for the uniform forming of the subsequent vacuum insulation chamber. The spout stamping process in the semi-finished product stage is synchronized with the spout stamping process of the outer shell semi-finished product, realizing the one-piece forming of the inner liner spout and the inner liner cup body, ensuring that the forming position and contour size of the spout of the inner liner and the outer shell correspond precisely, providing a precise structural foundation for the subsequent spout alignment, fitting, welding and fixing, avoiding problems such as excessive fitting gap, poor welding, and poor water flow caused by the dimensional deviation of the inner and outer spouts, while ensuring batch consistency of spout processing, achieving uniform spout size in mass production. The shaping process releases and corrects the deformation stress and dimensions after stretching and stamping the inner liner and spout. It precisely corrects deformation deviations in the roundness, straightness, and spout position of the cup body, ensuring dimensional accuracy and surface flatness of the inner liner. This prevents uneven gaps between the inner liner and outer shell caused by cup deformation and provides a precise dimensional reference for subsequent wire cutting processes, improving the forming accuracy of the inner liner semi-finished product. The wire cutting process precisely controls the height and contour accuracy of the inner liner semi-finished product's opening, ensuring equal height on both sides of the opening and a precise fit with the opening dimensions of the outer shell semi-finished product. This ensures that after the inner liner and outer shell are coaxially fitted, the opening and spout positions are perfectly aligned and fitted, significantly reducing the spout gap and solving the pain point of high welding scrap and defect rates caused by large gaps in the spout fit.

[0015] Step S3 is used to produce the vacuum bottom and outsole. The stretching process allows for precise control of the forming dimensions and structural strength of the vacuum bottom and outsole.

[0016] Step S4 is used to obtain the final product. The semi-finished product coaxial fitting process allows for precise control of the coaxiality of the inner liner and outer shell, ensuring uniform circumferential clearance. This provides a core benchmark for the uniform forming of the subsequent vacuum insulation chamber and precise spout alignment, avoiding spout misalignment and excessive clearance caused by fitting deviations. It fundamentally solves the industry pain point of difficult cup alignment during spout pressing, reducing the defect rate of subsequent welding processes. Completing the spout alignment and fitting at the semi-finished product stage allows for precise adjustment of the fitting gap between the inner and outer spouts, ensuring complete contact between the spout mating surfaces. This significantly reduces the fitting gap, solving the pain point of high welding scrap and defect rates caused by large fitting gaps in existing technologies. It provides a precise fitting basis for subsequent weld fixing and further ensures the consistency of spout forming. After the vacuum chamber is formed and the overall cup structure is fixed, a second stamping process is performed to finalize the spout. This completely eliminates spout deformation deviations caused by previous fitting and welding processes, precisely corrects the spout's outline dimensions and water outlet angle, ensuring the spout's forming accuracy and water flow performance, achieving stable water flow and crisp water cut-off. It also further enhances the consistency of spout processing, ensuring that the spout size and water flow performance of all products in mass production are completely uniform. Finally, the outer shell, vacuum base, and outer bottom are re-welded to further strengthen the sealing and bonding strength of the bottom welding structure, eliminating welding defects from previous step-by-step welding, and preventing the risk of bottom leakage and vacuum failure. It also ensures the uniformity of the appearance of the bottom welding positions, improving the overall quality and structural durability of the product.

[0017] This invention overcomes the core pain points in the molding of titanium tea cups, perfectly adapting to the processing characteristics of TA1 material; it addresses the two major technical defects in spout molding from the root of the process, balancing integrity and molding consistency; the scientific and reasonable process planning significantly improves production efficiency and finished product yield; the process design takes into account the compatibility of subsequent processing steps, reducing production difficulty and improving product appearance quality; it precisely ensures the core performance of the product, enhancing user experience and durability; and the process has a high degree of standardization, possessing strong customization potential.

[0018] As a preferred embodiment, in the manufacturing process of the double-layer vacuum tea cup described above, the A1 end point of the outer shell semi-finished product is the highest point of the wire cutting process, the A2 end point is the lowest point of the wire cutting process, and the two sides of the A1 end point and the A2 end point are at the same height.

[0019] The highest and lowest points can serve as the core machining benchmarks for the wire EDM process. Equal height on both sides ensures that the forming height of the spout on both sides of the outer shell is completely symmetrical, and the spout contour is free from skewing or offset deviation, greatly improving the forming accuracy of the spout.

[0020] As a preferred embodiment, in the manufacturing process of the double-layer vacuum tea cup described above, the B1 end point of the inner liner semi-finished product is the highest point of the wire cutting process, the B2 end point is the lowest point of the wire cutting process, and the two sides of the B1 end point and the B2 end point are at the same height.

[0021] The highest and lowest points can serve as the core machining benchmarks for the wire EDM process. Equal height on both sides ensures that the forming height of the spout on both sides of the inner liner is completely symmetrical, and the spout contour is free from skewing or offset deviation, greatly improving the forming accuracy of the spout.

[0022] Preferably, in the manufacturing process of the double-walled vacuum tea cup described above, the weld joint fixing in step S4 is a full-circle machining and welding process.

[0023] Continuous welding around the entire circumference ensures a seamless seal between the outer shell and inner liner at the spout, completely filling any gaps. This uniform heat distribution at the welding point effectively avoids warping, deformation, and uneven wall thickness caused by localized thermal stress concentrations, compared to spot welding or segmented welding. This guarantees the flatness, roundness, and dimensional accuracy of the spout after welding. The continuous welding creates a rigid, integrated structure with superior resistance to deformation and cracking compared to discontinuous welding. It effectively accommodates the mechanical and thermal stresses encountered during subsequent secondary stamping of the spout and bottom welding, preventing loosening and cracking at the welding point. This ensures the relative stability of the inner and outer liners throughout the entire manufacturing process, further guaranteeing batch consistency in spout production. The weld seam formed by the full-circle welding is continuous, uniform, and without any breaks or protruding weld beads. It perfectly meets the processing requirements of the subsequent polishing process. The polishing abrasive can fit the mouth and weld seam surface throughout the process, without any polishing dead corners. This not only significantly improves the efficiency of mouth polishing, but also ensures that the surface finish of the mouth is uniform and consistent. It avoids problems such as uneven polishing and burr residue caused by weld seam breaks in segmented welding, thereby improving the appearance quality and user experience of the product.

[0024] As a preferred embodiment, in the manufacturing process of the double-walled vacuum tea cup described above, step S4 involves the re-welding of the overall bottom of the outer shell, vacuum bottom, and outer base.

[0025] The overall weld bottom achieves a closed-loop repair of defects in the initial step-by-step welding process, eliminating the risk of bottom leakage and vacuum failure from the root; it constructs a three-layer integrated load-bearing structure, which greatly improves the structural strength of the bottom of the cup; and it forms a continuous and uniform weld, perfectly adapting to the polishing process of this invention.

[0026] As a preferred embodiment, in the manufacturing process of the double-layer vacuum tea cup described above, steps S1 and S2, the irregular cross-section of the TA1 plate formed by die stamping has a smooth transition; the radius of the rounded corners on the outer surface is the same.

[0027] The design of the irregular cross-section with smooth, sharp angles ensures that the material is subjected to uniform stress and flows smoothly during the deformation process of the spout during the two stretching and stamping processes. During the stamping deformation process, the cross-sectional topology of the cup body blank is reconstructed only through uniform material flow, without material cutting, splicing, or unnecessary loss. At the same time, the structural design without sharp angles and stress concentration fully preserves the overall structural strength of the TA1 sheet material, avoids structural weaknesses caused by cutting and splicing, and greatly improves the cup body's resistance to deformation and impact.

[0028] The uniform rounded corner transition radius solves the core defects of existing technologies, such as the inability of the polishing tool to fully fit the surface and the presence of many polishing dead corners. The uniform rounded corner transition radius allows the polishing tool to seamlessly fit the entire surface of the cup body throughout the process, without any gaps or blind spots. This not only significantly shortens the polishing time and improves the efficiency of the polishing operation, but also ensures that the amount of grinding on the surface of the cup body is uniform, achieving a consistent surface finish without over-polishing or under-polishing defects. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the tea cup of the present invention; Figure 2 This is a side view of the tea cup of the present invention. Figure 3 This is a cross-sectional view of the tea cup of the present invention; Figure 4 This is a schematic diagram of the structure after the first stretching in step S1 of the present invention; Figure 5 This is a schematic diagram of the structure after the second stretching in step S1 of the present invention; Figure 6 This is a schematic diagram of the structure after stamping the spout in step S1 of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the structure after stamping the spout in step S1 of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the structure after wire cutting in step S1 of the present invention; Figure 9 This is a schematic diagram of the structure of the shell semi-finished product obtained in step S1 of the present invention. Figure 1 ; Figure 10 This is a schematic diagram of the structure of the shell semi-finished product obtained in step S1 of the present invention. Figure 2 ; Figure 11 This is a schematic diagram of the structure after the first stretching in step S2 of the present invention; Figure 12 This is a schematic diagram of the structure after the second stretching in step S2 of the present invention; Figure 13This is a schematic diagram of the structure after stamping the spout in step S2 of the present invention; Figure 14 This is a schematic diagram of the structure after shaping in step S2 of the present invention; Figure 15 This is a schematic diagram of the structure after wire cutting in step S2 of the present invention; Figure 16 This is a schematic diagram of the structure of the inner liner semi-finished product obtained in step S2 of the present invention. Figure 1 ; Figure 17 This is a schematic diagram of the structure of the inner liner semi-finished product obtained in step S2 of the present invention. Figure 2 ; Figure 18 This is a schematic diagram of the structure after the weld joint is fixed in step S4 of the present invention; Figure 19 This is a schematic diagram of the structure after welding the vacuum base in step S4 of the present invention; Figure 20 This is a schematic diagram of the structure after stamping the spout in step S4 of the present invention.

[0030] Component names: 1. Outer shell, 2. Inner liner, 3. Vacuum bottom, 4. Outer bottom, 5. Spout structure. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-20 The invention will be further described in detail with reference to specific embodiments, but these are not intended to limit the invention: A double-walled vacuum tea cup includes an outer shell 1, an inner liner 2, a vacuum bottom 3, and an outer bottom 4. The outer shell 1 and the inner liner 2 are coaxially fitted cup-shaped structures, forming a sealed vacuum insulation chamber between them. The vacuum bottom 3 is sealed and welded to the bottom opening of the outer shell 1 to seal the vacuum insulation chamber. The outer bottom 4 is fixedly welded to the outside of the vacuum bottom 3. The upper part of the corresponding side wall of the outer shell 1 and the inner liner 2 are matched to form a spout structure 5.

[0032] A manufacturing process for a double-walled vacuum tea brewing cup, used to manufacture the aforementioned double-walled vacuum tea brewing cup, includes the following steps: S1: Take TA1 sheet material and perform blanking, double stretching, stamping spout, wire cutting, punching, flanging, and flattening processes to obtain the shell semi-finished product; S2: Take TA1 sheet material, and carry out blanking, double stretching, stamping spout, shaping and wire cutting processes to obtain the inner liner semi-finished product; S3: Take TA1 sheet material and perform blanking, stretching, and flattening processes to obtain vacuum sole 3; take TA1 sheet material and perform blanking, stretching, and flattening processes to obtain outsole 4; S4: The inner liner semi-finished product is coaxially inserted into the outer shell semi-finished product. The spouts of the two are aligned and fitted together for fitting. Then, the joint is fixed by welding. Next, the vacuum bottom 3 is fitted and welded to the bottom opening of the outer shell semi-finished product. After vacuum degassing, a vacuum heat insulation chamber is formed. Then, the spout is stamped to produce the finished outer shell 1 and inner liner 2. Then, the outer bottom 4 is fitted and welded to the outside of the vacuum bottom 3. Finally, the bottom is welded as a whole to produce a double-layer vacuum tea cup.

[0033] Preferably, the A1 end of the shell semi-finished product is the highest point of the wire cutting process, the A2 end is the lowest point of the wire cutting process, and the two sides of the A1 end and the A2 end are at the same height.

[0034] Preferably, the B1 end point of the inner liner semi-finished product is the highest point of the wire cutting process, the B2 end point is the lowest point of the wire cutting process, and the two sides of the B1 end point and the B2 end point are at the same height.

[0035] Preferably, the weld joint in step S4 is fixed by machining and welding the entire circumference.

[0036] Preferably, the overall welding base in step S4 is the re-welding of the bottom of the entire shell 1, vacuum base 3, and outer bottom 4.

[0037] Preferably, in steps S1 and S2, the irregular cross-section of the TA1 sheet formed by die stamping has a smooth transition; the radius of the rounded corners on the outer surface is the same.

[0038] like Figure 1-3 As shown, the double-layer vacuum tea cup of the present invention is a one-piece molded vacuum cup body made of TA1 industrial pure titanium material, specifically including four core components: outer shell 1, inner liner 2, vacuum bottom 3, and outer bottom 4.

[0039] The outer shell 1 and the inner liner 2 are coaxially fitted in a rotating cup-like structure. A sealed vacuum insulation chamber with uniform circumferential gaps is formed between the outer wall of the inner liner 2 and the inner wall of the outer shell 1. This vacuum environment blocks heat conduction and convection between the inner cavity of the cup and the outer surface of the outer shell 1, achieving excellent heat preservation, cold preservation, and heat insulation against scalding. Both the outer shell 1 and the inner liner 2 are made of 0.8mm thick TA1 industrial pure titanium sheet, balancing structural strength, lightweight requirements, and adaptability to cold forming.

[0040] The vacuum bottom 3 is welded to the bottom opening of the outer shell 1, serving as the bottom sealing structure of the vacuum insulation chamber and sealing it. The vacuum bottom 3 is made of 1.5mm thick TA1 industrial pure titanium sheet. The thicker sheet enhances the deformation resistance of the vacuum sealing structure, preventing structural collapse during vacuum exhaust and ensuring the long-term sealing of the vacuum chamber. The outer bottom 4 is fixedly welded to the outside of the vacuum bottom 3, serving as both a decorative and wear-resistant support for the bottom of the cup. The outer bottom 4 is made of 0.5mm thick TA1 industrial pure titanium sheet, allowing for refined processing of the appearance while reducing the weight of the bottom of the cup.

[0041] The upper part of the corresponding side wall of the outer shell 1 and the inner liner 2 are matched to form the spout structure 5. The spout structure 5 is an integral structure formed by stamping the outer shell 1 and the inner liner 2. The spout of the outer shell 1 and the spout of the inner liner 2 are completely aligned and fit together. There is no splicing weld seam of the spout, which avoids the risk of leakage and welding failure at the spout position, ensuring smooth water flow and crisp water cut-off, without the problems of water dripping or hanging on the cup wall.

[0042] The outer shell 1 and the inner liner 2 are formed by stamping with a mold, resulting in a smooth transition of the irregular cross-section without sharp corners. All rounded corners on the outer surface of the cup have the same radius. The preferred rounded corner radius is R2 to R5, which can be R2, R3, R4, or R5. This ensures that the material is subjected to uniform stress during the stamping process, avoiding cracking and wrinkling, and also allows for subsequent automated polishing processes to eliminate polishing dead corners and ensure a uniform and consistent surface finish on the cup.

[0043] Preparation of shell semi-finished product: The blanking process completes the preparation of the basic blank; two stretching processes complete the main body forming in steps, and the structure after the first stretching is as follows: Figure 4 As shown, the structure after the second stretch is as follows Figure 5 As shown; the stamping process integrally forms the basic shape of the spout at the corresponding position on the side wall, and the structure after stamping is as follows. Figure 6-7 As shown, the spout and cup body are integrally formed; the wire cutting process precisely cuts the rim of the cup body, resulting in the following structure: Figure 8 As shown, endpoint A1 of the semi-finished outer shell is the highest point of the wire cutting process, and endpoint A2 is the lowest point of the wire cutting process. The two sides of the line connecting endpoints A1 and A2 are at the same height to ensure the flatness of the mouth and the symmetry of the spout forming. The punching, flanging, and flattening processes complete the forming and leveling of the cup bottom structure. The final semi-finished outer shell structure is as shown. Figure 9-10 As shown.

[0044] Preparation of semi-finished inner liner: The blanking process completes the preparation of the inner liner base blank; the structure after the first stretching is as follows: Figure 11 As shown, the structure after the second stretch is as follows Figure 12As shown; the stamping process integrally forms the basic shape of the spout at the corresponding position on the inner side wall of the kettle liner, and the structure after stamping is as follows. Figure 13 As shown; the shaping process performs stress relief and dimensional correction on the inner liner after stretching and stamping, and the structure after shaping is as follows. Figure 14 As shown, the deformation deviations in the roundness, straightness, and spout position of the cup body are corrected; the wire cutting process precisely cuts the inner liner opening, and the structure after cutting is as follows. Figure 15 As shown, endpoint B1 of the semi-finished inner liner is the highest point of the wire cutting process, and endpoint B2 is the lowest point of the wire cutting process. The two sides of the line connecting endpoints B1 and B2 are at the same height to ensure a precise fit between the inner liner opening and the outer shell opening. The final structure of the semi-finished inner liner is as follows: Figure 16-17 As shown.

[0045] Bottom component preparation: Take TA1 sheet, and through blanking, stretching and flattening processes, obtain vacuum bottom 3; take another TA1 sheet, and through blanking, stretching and flattening processes, obtain outsole 4.

[0046] Final assembly and final molding: The spout alignment and fitting process precisely adjusts the fitting gap between the inner and outer spouts to ensure complete contact of the mating surfaces and reduce the welding defect rate; the weld joint is fixed by full-circle machining and welding, and the structure after weld joint fixing is as follows: Figure 18 As shown, a seamless, rigid connection is achieved between the outer shell 1 and the inner liner 2 at the opening, preventing warping and deformation of the opening during welding; the structure of the vacuum bottom 3 after welding is as follows. Figure 19 As shown, the bottom of the vacuum insulation chamber is sealed, and a stable vacuum insulation structure is formed after vacuum exhaust. The secondary stamping process completes the final forming of the spout, producing spout structure 5. The structure after stamping is as follows. Figure 20 As shown, the process eliminates the deformation deviation of the spout caused by the initial fitting and welding processes, precisely corrects the spout contour dimensions and water outlet angle, and ensures the consistency of spout processing and water outlet performance. After the spout is finally formed, the outer bottom 4 is aligned and assembled onto the outside of the vacuum bottom 3 and welded in place. The overall welded bottom is a re-welding of the bottom of the outer shell 1, vacuum bottom 3, and outer bottom 4, which eliminates the defects of the previous step-by-step welding, strengthens the bottom sealing and structural strength, and eliminates the risk of leakage and vacuum failure. The final tea cup produced is as follows: Figure 1-3 As shown.

[0047] This invention is tested according to GB / T 2828.1-2012 "Sampling Procedures for Inspection by Attributes - Part 1: Sampling Schemes Retrieved by Acceptable Quality Limit (AQL) for Lot-by-Lot Inspection", with the evaluation index being dimensional tolerance ≤ ±0.5 mm. The test results show a pass rate of over 97%.

[0048] The average time for a single process in the manufacturing process of this invention is less than 10 seconds, and the overall production efficiency is improved by more than 30% compared with the existing technology.

[0049] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included within the scope of the present invention.

Claims

1. A double-walled vacuum tea cup, comprising an outer shell (1), an inner liner (2), a vacuum bottom (3), and an outer bottom (4), characterized in that: The outer shell (1) and the inner liner (2) are coaxially fitted cup-shaped structures, forming a sealed vacuum insulation chamber between them; the vacuum bottom (3) is sealed and welded to the bottom opening of the outer shell (1) to seal the vacuum insulation chamber; the outer bottom (4) is fixedly welded to the outside of the vacuum bottom (3); the upper part of the corresponding side wall of the outer shell (1) and the inner liner (2) are matched to form a spout structure (5).

2. A manufacturing process for a double-walled vacuum tea infuser cup, characterized in that: The method for manufacturing the double-walled vacuum tea cup according to claim 1 includes the following steps: S1: Take TA1 sheet material and perform blanking, double stretching, stamping spout, wire cutting, punching, flanging, and flattening processes to obtain the shell semi-finished product; S2: Take TA1 sheet material, and carry out blanking, double stretching, stamping spout, shaping and wire cutting processes to obtain the inner liner semi-finished product; S3: Take TA1 sheet, perform blanking, stretching and flattening processes to obtain vacuum bottom (3); take TA1 sheet, perform blanking, stretching and flattening processes to obtain outsole (4). S4: The inner liner semi-finished product is coaxially inserted into the outer shell semi-finished product. The spouts of the two are aligned and fitted together. Then, the joint is fixed by welding. Then, the vacuum bottom (3) is fitted and welded to the bottom opening of the outer shell semi-finished product. After vacuum exhaust is completed, a vacuum heat insulation chamber is formed. Then, the spout is stamped to make the finished outer shell (1) and inner liner (2). Then, the outer bottom (4) is fitted and welded to the outside of the vacuum bottom (3). Finally, the bottom is welded as a whole to make a double-layer vacuum tea cup.

3. The manufacturing process of a double-walled vacuum tea cup according to claim 2, characterized in that: The A1 end point of the semi-finished shell is the highest point of the wire cutting process, and the A2 end point is the lowest point of the wire cutting process. The two sides of the A1 end point and the A2 end point are at the same height.

4. The manufacturing process of a double-walled vacuum tea cup according to claim 2, characterized in that: The B1 end point of the inner liner semi-finished product is the highest point of the wire cutting process, and the B2 end point is the lowest point of the wire cutting process. The two sides of the B1 end point and the B2 end point are at the same height.

5. The manufacturing process of a double-walled vacuum tea cup according to claim 2, characterized in that: The weld joint in step S4 is fixed by machining and welding the entire circle.

6. The manufacturing process of a double-walled vacuum tea cup according to claim 2, characterized in that: Step S4 is the re-welding of the bottom of the entire shell (1), vacuum bottom (3), and outer bottom (4).

7. The manufacturing process of a double-walled vacuum tea cup according to claim 2, characterized in that: In steps S1 and S2, the irregular cross-section of the TA1 sheet metal, formed by die stamping, has a smooth transition; the radius of the rounded corners on the outer surface is the same.

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