Titanium vacuum cup water swelling forming process

Abstract

The application discloses a titanium vacuum cup water swelling forming process, comprising the following steps: S1: cutting titanium pipe, collecting the semi-finished product pipe body A, and collecting the semi-finished product pipe body B; S2: water swelling of the semi-finished product pipe body C, and necking of the semi-finished product pipe body D. The application forms a complete solution for titanium vacuum cup forming through the synergistic process of "cutting-two times of pipe collecting-water swelling-final necking", and solves the problems of limited water swelling range of the titanium pipe, great processing difficulty, low efficiency, high loss, poor product consistency and the like in the traditional process.

Description

Technical Field

[0001] This invention relates to the field of thermos cup technology, and in particular to a water expansion molding process for titanium thermos cups. Background Technology

[0002] In the production of thermos flasks, hydroforming is a crucial process that uses liquid pressure to conform the tube to a mold cavity to achieve the desired shape. For titanium thermos flasks, due to the inherent properties of titanium, the tube exhibits significant limitations in hydroforming, which imposes strict constraints on product design. This is particularly true for irregularly shaped products with large differences in height between the mouth and bottom; the limited hydroforming range of the titanium tube makes direct molding extremely difficult, leading not only to numerous uncertainties in subsequent production processes but also to severe resource waste and production cost losses.

[0003] In existing technologies, for titanium insulated cups with a large body and a small bottom, if a pre-treatment process for narrowing the rim or bottom is not used, processing is usually required through eccentric fitting between molds. This processing method is not only complex to operate, but also leads to a high loss rate and low production efficiency during the production process. Furthermore, it is difficult to guarantee the dimensional accuracy, appearance quality, and consistency of the product, which seriously affects the product's competitiveness.

[0004] In addition, some processes use a shrinking machine to reduce the diameter of the tube body in order to meet the subsequent water expansion molding requirements. However, the shrinking machine processing has significant defects: on the one hand, the shrinking accuracy is poor and the dimensional stability is insufficient, making it difficult to meet the high-precision molding requirements; on the other hand, obvious knife marks are easily left on the surface of the tube body during the shrinking process, which damages the integrity of the product appearance and further increases the difficulty of quality control.

[0005] Meanwhile, for titanium tubes with a large initial diameter (such as 75mm), if water expansion molding is performed directly, the target cup shape cannot be formed due to insufficient water expansion. If the necking process is performed after water expansion, the entire production process will be difficult to advance due to positioning difficulties, which seriously restricts production efficiency and causes a lot of cost waste.

[0006] Therefore, improvements are needed to address the above issues, overcome the limitations of water expansion in titanium tubes, and solve problems such as high processing difficulty, low efficiency, high cost, and unstable product quality in traditional molding processes. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies, such as high processing difficulty, low efficiency, high cost, and unstable product quality, by providing a new process for the water expansion molding of titanium thermos cups.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A process for water expansion molding of a titanium thermos cup includes the following steps: S1: Take a titanium tube, cut it to the required length to obtain a semi-finished tube body A, take a tube collecting mold A, collect the semi-finished tube body A to obtain a semi-finished tube body B, take a tube collecting mold B, collect the semi-finished tube body B to obtain a semi-finished tube body C. S2: Take the water expansion mold, water expand the semi-finished tube C to obtain the semi-finished tube D, and finally shrink the opening of the semi-finished tube D to obtain the cup body of the titanium thermos cup.

[0009] Step S1 precisely cuts the titanium tube to the correct length, providing a suitable base blank for subsequent tube shrinking and water expansion processes, avoiding processing errors or material waste caused by improper tube length. Simultaneously, a uniform initial length ensures the stability of tube positioning in subsequent processes, reducing processing losses caused by inconsistent blank dimensions and laying the foundation for improved product consistency. The initial shrinking of the titanium tube using the shrinking mold A initially reduces the tube diameter to meet subsequent processing requirements. Compared to traditional necking machines, using a shrinking mold in conjunction with a hydraulic press for extrusion molding offers the following advantages: shorter processing time, improving single-process efficiency; smooth, seamless transitions between different parts of the tube, avoiding the knife marks and defects of necking machines, improving appearance quality; high dimensional stability, reducing adjustment losses, and providing precise intermediate blanks for subsequent secondary shrinking. The second shrinking is for products with larger shrinkage (such as shapes with a large difference in height between the opening and bottom), using step-by-step shrinking to achieve gradual and precise control of the tube size, avoiding tube deformation and wrinkles caused by excessive shrinking in a single operation. Meanwhile, the cooperation of tube molds A and B can achieve gradient adjustment of tube shape, further improve tube size accuracy, solve the problem that "titanium tubes with a diameter of 75mm cannot be formed by direct water expansion" in traditional processes, and create suitable conditions for subsequent water expansion processes.

[0010] Step S2: After two rounds of tube shrinking, the semi-finished tube C is sized to meet the water expansion requirements, effectively reducing the limitations on the expansion range of the titanium tube. During water expansion, the tube conforms to the shape of the mold cavity under the combined action of water pressure and the mold cavity. Because the semi-finished tube C has precise and consistent dimensions, the semi-finished tube D obtained after water expansion has good appearance stability and precise dimensions, solving the product quality variation problem caused by traditional eccentric mold processing. The final necking process can precisely control the size of the cup mouth, ensuring that the product shape fully meets the design requirements (especially for irregular structures with a large difference in height between the mouth and the bottom). This step further improves the product structure, ensuring the cup's sealing performance, assemblability, and other functional indicators, enhancing the product's practicality and market competitiveness.

[0011] This invention provides a complete solution for molding titanium insulated cups through a collaborative process of "cutting - two-stage tube shrinking - water expansion - final necking," comprehensively solving problems such as limited water expansion range of titanium tubes, high processing difficulty, low efficiency, high waste, and poor product consistency in traditional processes. It overcomes material limitations: by reducing the required water expansion range of titanium tubes through two-stage tube shrinking, it overcomes the inherent limitation of small water expansion range in titanium material, enabling the molding of complex shapes with large differences between the opening and bottom. It improves production efficiency and cost control: compared to traditional eccentric mold processing or necking machine processing, this process uses a hydraulic press with a dedicated mold to achieve tube shrinking, resulting in shorter processing time, less debugging waste, and stable dimensions, significantly reducing production uncertainty and resource waste, and improving production efficiency. It optimizes product quality: the collaborative processes ensure the dimensional accuracy, appearance integrity (no joint marks, knife marks), and consistency of the tube body from raw material to finished product, improving product quality control. It expands the application scope: not only applicable to titanium cups, but also extend to stainless steel cups, possessing broad technical applicability and industrialization value.

[0012] As a preferred embodiment, in the above-described titanium thermos cup water expansion molding process, the tube receiving mold A and the tube receiving mold B both include mutually cooperating upper tube receiving mold cavity and lower tube receiving mold cavity. The upper tube receiving mold cavity is connected to a tube receiving mold frame flange and is provided with a tube receiving ejection block. The lower tube receiving mold cavity is connected to a lower tube receiving flange and is provided with a tube receiving mold core inside the lower tube receiving mold cavity.

[0013] The precise fit between the upper and lower mold cavities and the mold core during the tube-taking process enables the titanium tube to withstand large-scale deformation during step-by-step tube taking, overcoming the limitation of the inherently limited water expansion range of titanium (it is difficult to form a 75mm titanium tube directly by water expansion in traditional processes), and creating ideal blank conditions for subsequent water expansion processes. The ejector block and flange system ensure efficient demolding and stable equipment operation, significantly improving the feasibility and yield of complex shapes for titanium thermos cups. Through the synergy of four core features—precisely constrained mold cavities, rigid flange connections, automatic ejection mechanism, and internal mold core guidance—the system systematically solves the problems of precision, efficiency, stability, and automation adaptation in the titanium tube taking process.

[0014] Preferably, in the above-described titanium thermos cup water expansion molding process, the head of the tube-receiving mold core of the tube-receiving mold A is an outwardly expanding arc-shaped structure, and the head of the tube-receiving mold core of the tube-receiving mold B is an inwardly concave arc-shaped structure.

[0015] The outward-expanding arc-shaped structure smoothly guides the plastic deformation of the semi-finished tube A during the first tube-shrinking process, distributing the stress along the arc surface and preventing wrinkles, cracks, or uneven wall thickness caused by localized stress concentration. This is particularly suitable for materials like titanium, which are difficult to cold-work and prone to processing defects. The inward-concave arc-shaped structure complements the outward-expanding arc-shaped surface of the semi-finished tube B, further guiding the material to shrink towards the target size during the second tube-shrinking process, ensuring controllable shrinkage and precise dimensions.

[0016] As a preferred embodiment, the above-described titanium thermos cup water expansion molding process includes a water expansion mold cavity, a water expansion mold cavity seat and a water expansion mold cavity seat flange connected sequentially to the lower side of the water expansion mold cavity, an upper water expansion mandrel and a lower water expansion mandrel provided inside the water expansion mold cavity, and a water expansion mold cavity cylinder provided outside the water expansion mold cavity.

[0017] Through the synergistic action of its components, the hydraulic expansion mold systematically solves the problems of precision, stability, and reliability in the hydraulic expansion molding of titanium tubes, improving molding accuracy and consistency. The precise cavity of the hydraulic expansion mold and the positioning function of the upper and lower hydraulic mandrels ensure that the tube body completely conforms to the shape of the mold cavity under water pressure, avoiding dimensional fluctuations caused by lack of constraints or positioning deviations in traditional processes. The rigid fixation of the hydraulic expansion mold cavity seat and flange ensures the concentricity of the mold cavity installation, reduces the shape difference between batch products, and solves the problem of "poor product consistency".

[0018] Preferably, in the above-described titanium thermos cup water expansion molding process, the upper water expansion mandrel is sequentially connected to the upper water expansion seat and the upper water expansion flange, and the upper water expansion mold raising block is provided outside the upper water expansion seat; the lower water expansion mandrel is sequentially connected to the lower water expansion seat and the lower water expansion flange, and the lower water expansion mold raising block is provided outside the lower water expansion seat.

[0019] The connection structure between the upper and lower mandrels in the water-expanding process, combined with the raising blocks of the upper and lower water-expanding molds, systematically solves the problems of inaccurate mandrel positioning, poor stability, and low adaptability in traditional water-expanding processes through a collaborative design of "rigid fixation + flexible adjustment." This improves molding accuracy and stability, better suits the characteristics of titanium materials, breaks through molding bottlenecks, and avoids cracking or wrinkling caused by the small water expansion amplitude and poor cold working performance of titanium materials, further overcoming the technical limitations of titanium material molding.

[0020] Preferably, in the above-described titanium thermos cup water expansion molding process, step S1 of taking the semi-finished tube A into place includes the following steps: Install the tube receiving mold A on the hydraulic press table and correct the concentricity of the upper and lower receiving cavities of the tube receiving mold A. Then, insert the semi-finished tube body A into the gap between the lower receiving cavity and the receiving mold core of the tube receiving mold A. Then, turn on the hydraulic press. Driven by the upper cylinder of the hydraulic press, the upper receiving cavity of the tube receiving mold A descends and generates a squeezing force on the semi-finished tube body A through the inner shape of the upper receiving cavity of the tube receiving mold A to receive the semi-finished tube body A. At the same time, the upper cylinder of the hydraulic press will have a material ejection rod extending out to generate a pushing force on the tube receiving ejection block of the tube receiving mold A to eject the material.

[0021] The hydraulic press table provides rigid support for the tube-receiving mold A, ensuring stable force distribution during high-pressure extrusion and preventing processing deviations caused by mold wobbling. Correcting the concentricity of the upper and lower mold cavities is crucial for ensuring uniform tube deformation, effectively preventing localized excessive extrusion or uneven stress due to mold eccentricity. This reduces defects such as cracking and wrinkling in titanium tubes (titanium has poor cold-working properties), laying the foundation for subsequent tube-receiving accuracy. The gap between the lower mold cavity and the mold core provides precise positioning space for the semi-finished tube A, ensuring the tube is in the preset processing position before extrusion and preventing dimensional deviations caused by tube offset. This gap design constrains the deformation range of the tube, guiding controlled deformation only along the mold cavity direction, preventing tube instability caused by unconstrained extrusion, and is particularly suitable for materials like titanium that are prone to processing defects. The hydraulic press's upper cylinder drive provides stable and controllable extrusion force. Compared to the mechanical shrinking of traditional shrinking machines, it allows for precise control of pressure parameters, ensuring uniform tube shrinking force and improving the dimensional stability of the semi-finished tube body B. The inner shape of the upper mold cavity directly determines the tube's contour after shrinking. By guiding the tube material to flow evenly through the preset inner shape, it achieves "smooth, seamless transitions between different parts," avoiding the appearance defects of "obvious shrinking knife marks" found in shrinking machines and improving product appearance quality. The feeding rod and ejection block work together to achieve automated ejection, eliminating the need for manual prying or dragging of the formed semi-finished tube body B. This avoids secondary damage such as tube deformation and surface scratches caused by manual intervention, ensuring the integrity of the semi-finished tube body B. Automated ejection shortens the cycle time for each tube shrinking cycle, reduces equipment downtime, improves production efficiency, and reduces the safety hazards of manual operation.

[0022] Preferably, in the above-described titanium thermos cup water expansion molding process, step S1 of taking the semi-finished tube B into place includes the following steps: Install the tube receiving mold B on the hydraulic press table and correct the concentricity of the upper and lower receiving cavities of the tube receiving mold B. Then, insert the semi-finished tube body B into the gap between the lower receiving cavity and the receiving mold core of the tube receiving mold B. Then, turn on the hydraulic press. The upper receiving cavity of the tube receiving mold B is driven by the upper cylinder of the hydraulic press and descends. The inner shape of the upper receiving cavity of the tube receiving mold B generates a squeezing force to collect the semi-finished tube body B. At the same time, the upper cylinder of the hydraulic press will have a material ejection rod extending out to generate a pushing force on the tube receiving ejection block of the tube receiving mold B to eject the material.

[0023] The above steps, through a continuous process of "mold installation and concentricity correction - tube body B positioning - hydraulically driven extrusion - automatic material unloading", serve as a secondary tube-receiving process. Together with the primary tube-receiving process, they solve the problems of "difficult processing, unstable dimensions, and numerous defects" in traditional tube-receiving processes.

[0024] Preferably, in the above-described titanium thermos cup water expansion molding process, step S2 of water expansion of the semi-finished tube C includes the following steps: Install the water-expanding mold on the hydraulic press table and calibrate the concentricity of the upper and lower water-expanding mandrels. Insert the semi-finished tube C into the water-expanding mold cavity. Adjust the equipment parameters as needed. Driven by the upper cylinder of the hydraulic press, the upper water-expanding mandrel will close with the lower water-expanding mandrel. The main cylinder of the hydraulic press will introduce water into the water-expanding mold cavity and apply pressure. The semi-finished tube C is expanded and shaped by the extrusion of water and the shape of the inner side of the water-expanding mold cavity.

[0025] The aforementioned water expansion steps, through a continuous process of "mold installation and concentricity correction - tube positioning - parameter adjustment - mold closing - water pressure expansion," in conjunction with the two preceding tube-receiving processes, systematically solve the core technical challenges of water expansion forming of titanium tubes. This overcomes the limitations of titanium material water expansion, improves forming accuracy and quality, optimizes production efficiency and cost, and strengthens process synergy. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cup body in this invention; Figure 2 This is a schematic diagram of the structure of the semi-finished tube A in this invention; Figure 3 This is a schematic diagram of the structure of the semi-finished tube body B in this invention; Figure 4 This is a schematic diagram of the structure of the semi-finished tube C in this invention; Figure 5 This is a schematic diagram of the structure of the semi-finished tube body D in this invention; Figure 6 This is a schematic diagram of the structure of the tube-receiving mold A in this invention; Figure 7 This is an exploded view of the tube-receiving mold A in this invention; Figure 8 This is a schematic diagram of the structure of the tube-receiving mold B in this invention; Figure 9 This is an exploded view of the tube-receiving mold B in this invention; Figure 10 This is a schematic diagram of the structure of the water-expanding mold in this invention; Figure 11 This is an exploded view of the water-expanding mold in this invention. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-11 The invention will be further described in detail with reference to specific embodiments, but these are not intended to limit the invention: A process for water expansion molding of a titanium thermos cup includes the following steps: S1: Take a titanium tube, cut it to the required length to obtain a semi-finished tube body A1, take a tube collecting mold A, collect the semi-finished tube body A1 to obtain a semi-finished tube body B2, take a tube collecting mold B, collect the semi-finished tube body B2 to obtain a semi-finished tube body C3. S2: Take the water expansion mold and water expand the semi-finished tube C3 to obtain the semi-finished tube D4. Finally, shrink the opening of the semi-finished tube D4 to obtain the cup body of the titanium thermos cup.

[0028] Preferably, both the tube receiving mold A and the tube receiving mold B include a tube receiving upper mold cavity 5 and a tube receiving lower mold cavity 51 that cooperate with each other. The tube receiving upper mold cavity 5 is connected to a tube receiving mold frame flange 52 and is provided with a tube receiving ejector block 53. The tube receiving lower mold cavity 51 is connected to a tube receiving lower flange 54 and is provided with a tube receiving mold core 55 inside the tube receiving lower mold cavity 51.

[0029] Preferably, the head of the tube receiving mold core 55 of tube receiving mold A is an outwardly expanding arc-shaped structure, while the head of the tube receiving mold core 55 of tube receiving mold B is an inwardly concave arc-shaped structure.

[0030] Preferably, the water-expanding mold includes a water-expanding mold cavity 6, with a water-expanding mold cavity seat 61 and a water-expanding mold cavity seat flange 62 connected sequentially to the lower side of the water-expanding mold cavity 6. A water-expanding upper core rod 7 and a water-expanding lower core rod 8 are provided inside the water-expanding mold cavity 6, and a water-expanding mold cavity cylinder 63 is provided outside the water-expanding mold cavity 6.

[0031] Preferably, the upper mandrel 7 is connected in sequence to the upper mandrel seat 71 and the upper flange 72, and the upper mandrel seat 71 is provided with the upper mold raising block 73. The lower mandrel 8 is connected in sequence to the lower mandrel seat 81 and the lower flange 82, and the lower mandrel seat 81 is provided with the lower mold raising block 83.

[0032] Preferably, step S1, which involves taking in the semi-finished tube A1, includes the following steps: Install the tube receiving mold A on the hydraulic press table and correct the concentricity of the upper tube receiving cavity 5 and the lower tube receiving cavity 51 of the tube receiving mold A. Then, insert the semi-finished tube body A1 into the gap between the lower tube receiving cavity 51 and the tube receiving mold core 55 of the tube receiving mold A. Then, turn on the hydraulic press. The upper tube receiving cavity 5 of the tube receiving mold A is driven by the upper cylinder of the hydraulic press and descends. The inner shape of the upper tube receiving cavity 5 of the tube receiving mold A generates a force to squeeze the semi-finished tube body A1 to receive the semi-finished tube body A1. At the same time, the upper cylinder of the hydraulic press will have a material ejection rod extending out to generate a pushing force on the tube receiving ejection block 53 of the tube receiving mold A to eject the material.

[0033] Preferably, step S1, which involves taking in the semi-finished tube B2, includes the following steps: Install the tube receiving mold B on the hydraulic press table and correct the concentricity of the upper tube receiving cavity 5 and the lower tube receiving cavity 51 of the tube receiving mold B. Then, insert the semi-finished tube body B2 into the gap between the lower tube receiving cavity 51 and the tube receiving mold core 55 of the tube receiving mold B. Then, turn on the hydraulic press. The upper tube receiving cavity 5 of the tube receiving mold B is driven by the upper cylinder of the hydraulic press and descends. The inner shape of the upper tube receiving cavity 5 of the tube receiving mold B generates the force to squeeze the semi-finished tube body B2 to receive the semi-finished tube body B2. At the same time, the upper cylinder of the hydraulic press will have a material ejection rod extending out to generate a thrust on the tube receiving ejection block 53 of the tube receiving mold B to eject the material.

[0034] Preferably, step S2, which involves hydroswelling the semi-finished pipe body C3, includes the following steps: Install the water-expanding mold on the hydraulic press table and correct the concentricity of the upper water-expanding mandrel 7 and the lower water-expanding mandrel 8. Insert the semi-finished tube C3 into the water-expanding mold cavity 6. Adjust the equipment parameters as needed. Under the drive of the upper cylinder of the hydraulic press, the upper water-expanding mandrel 7 will close with the lower water-expanding mandrel 8. The main cylinder of the hydraulic press will introduce water into the water-expanding mold cavity 6 and apply pressure. The semi-finished tube C3 will be expanded and shaped by the extrusion of water and the inner shape of the water-expanding mold cavity 6.

[0035] like Figure 1-5 As shown, the titanium tube is processed using the process of this invention to obtain the desired titanium insulated cup body. (As illustrated...) Figure 6-9 As shown, the head of the tube receiving mold core 55 of tube receiving mold A is an outwardly expanding arc-shaped structure, while the head of the tube receiving mold core 55 of tube receiving mold B is an inwardly concave arc-shaped structure. Figure 10-11 As shown, the semi-finished tube body D4 is obtained through a water-expanding mold.

[0036] 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 process for water-expanding molding of a titanium thermos cup, characterized in that: Includes the following steps: S1: Take a titanium tube, cut the titanium tube to the required length, and obtain a semi-finished tube body A (1). Take a tube collecting mold A and collect the semi-finished tube body A (1) to obtain a semi-finished tube body B (2). Take a tube collecting mold B and collect the semi-finished tube body B (2) to obtain a semi-finished tube body C (3). S2: Take the water expansion mold, water expand the semi-finished tube body C (3) to obtain the semi-finished tube body D (4), and finally shrink the opening of the semi-finished tube body D (4) to obtain the cup body of the titanium thermos cup. Both the pipe receiving mold A and the pipe receiving mold B include a pipe receiving upper mold cavity (5) and a pipe receiving lower mold cavity (51) that cooperate with each other. The pipe receiving upper mold cavity (5) is connected to a pipe receiving mold frame flange (52). The pipe receiving upper mold cavity (5) is provided with a pipe receiving ejector block (53). The pipe receiving lower mold cavity (51) is connected to a pipe receiving lower flange (54). The pipe receiving lower mold cavity (51) is provided with a pipe receiving mold core (55). The head of the tube receiving mold core (55) of tube receiving mold A is an outwardly expanding arc structure, while the head of the tube receiving mold core (55) of tube receiving mold B is an inwardly concave arc structure. Step S1 involves taking in the semi-finished pipe body A (1) and includes the following steps: Install the tube receiving mold A on the hydraulic press table and correct the concentricity of the upper tube receiving mold cavity (5) and the lower tube receiving mold cavity (51) of the tube receiving mold A. Then insert the semi-finished tube body A (1) into the gap between the lower tube receiving mold cavity (51) and the tube receiving mold core (55) of the tube receiving mold A. Then turn on the hydraulic press. The upper tube receiving mold cavity (5) of the tube receiving mold A is driven by the upper cylinder of the hydraulic press and descends. The inner shape of the upper tube receiving mold cavity (5) of the tube receiving mold A generates the force to squeeze the semi-finished tube body A (1) to receive the semi-finished tube body A (1). At the same time, the upper cylinder of the hydraulic press will have a material ejection rod extending out to generate a thrust on the tube receiving ejection block (53) of the tube receiving mold A to eject the material. Step S1 involves taking in the semi-finished tube body B (2) and includes the following steps: Install the tube receiving mold B on the hydraulic press table and correct the concentricity of the upper tube receiving mold cavity (5) and the lower tube receiving mold cavity (51) of the tube receiving mold B. Then insert the semi-finished tube body B (2) into the gap between the lower tube receiving mold cavity (51) and the tube receiving mold core (55) of the tube receiving mold B. Then turn on the hydraulic press. The upper tube receiving mold cavity (5) of the tube receiving mold B is driven by the upper cylinder of the hydraulic press and descends. It generates the force to squeeze the semi-finished tube body B (2) through the inner shape of the upper tube receiving mold cavity (5) of the tube receiving mold B to receive the semi-finished tube body B (2). At the same time, the upper cylinder of the hydraulic press will have a material ejection rod extending out to generate a thrust on the tube receiving ejection block (53) of the tube receiving mold B to eject the material.

2. The process for water-expanding molding of a titanium thermos cup according to claim 1, characterized in that: The water expansion mold includes a water expansion mold cavity (6), a water expansion mold cavity seat (61) and a water expansion mold cavity seat flange (62) are connected in sequence on the lower side of the water expansion mold cavity (6), an upper water expansion mandrel (7) and a lower water expansion mandrel (8) are provided inside the water expansion mold cavity (6), and a water expansion mold cavity cylinder (63) is provided outside the water expansion mold cavity (6).

3. The process for water-expanding molding of a titanium thermos cup according to claim 2, characterized in that: The upper mandrel (7) is connected in sequence to the upper mandrel seat (71) and the upper flange (72). The upper mandrel seat (71) is provided with an upper mold raising block (73). The lower mandrel (8) is connected in sequence to the lower mandrel seat (81) and the lower flange (82). The lower mandrel seat (81) is provided with an upper mold raising block (83).

4. The process for water-expanding molding of a titanium thermos cup according to claim 3, characterized in that: Step S2 involves water expansion of the semi-finished pipe body C(3), including the following steps: Install the water-expanding mold on the hydraulic press table and correct the concentricity of the upper water-expanding mandrel (7) and the lower water-expanding mandrel (8) of the water-expanding mold. Insert the semi-finished tube body C (3) into the water-expanding mold cavity (6). Adjust the equipment parameters as needed. Under the drive of the upper cylinder of the hydraulic press, the upper water-expanding mandrel (7) will close with the lower water-expanding mandrel (8). The main cylinder of the hydraulic press will inject water into the water-expanding mold cavity (6) and apply pressure. The semi-finished tube body C (3) will be expanded by the extrusion of water and the inner shape of the water-expanding mold cavity (6).

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