Water expansion forming process for titanium vacuum cup

Abstract

The titanium vacuum cup water expansion forming process comprises the following steps that S1, a titanium pipe is cut, a semi-finished pipe body A is collected, and a semi-finished pipe body B is collected; and S2, the semi-finished pipe body C is subjected to water swelling, and the semi-finished pipe body D is subjected to necking. According to the method, a complete solution for forming the titanium vacuum cup is formed through the cooperative working procedures of cutting, two-time pipe collecting, water expansion and final necking, and the problems that in a traditional technology, the water expansion amplitude of a titanium pipe is limited, the machining difficulty is large, efficiency is low, loss is high, and product consistency is poor are solved on the whole.

Description

Technical Field

[0001] The present invention relates to the technical field of thermos cups, and in particular to a water expansion forming process for a titanium thermos cup. Background Art

[0002] In thermos production, hydroforming is a critical process that uses liquid pressure to force the tube to conform to the mold cavity to achieve the target shape. For titanium thermos, due to the inherent properties of titanium, the tube is significantly limited in its expansion during hydroforming, which imposes strict constraints on product design. This is particularly true for products with special-shaped structures that have a large difference between the mouth and the bottom. The limited expansion range of the titanium tube makes direct forming extremely difficult, not only leading to a large amount of uncertainty in the subsequent production process, but also resulting in significant waste of resources and production costs.

[0003] Existing technology for titanium thermos products with large bodies and small bottoms typically requires eccentric fit between molds, unless pre-treatment processes are used to close the top or bottom. This processing method is not only complex but also leads to high waste rates and low production efficiency during the production process. Furthermore, it is difficult to ensure the dimensional accuracy, appearance quality, and consistency of the product, seriously affecting product competitiveness.

[0004] In addition, some processes use a shrinking machine to reduce the diameter of the tube body in order to adapt to the subsequent water expansion molding requirements, but 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, the shrinking process is likely to leave obvious knife marks on the surface of the tube body, destroying the integrity of the product appearance and further increasing the difficulty of quality control.

[0005] At the same time, for titanium tubes with a larger initial diameter (such as 75mm in diameter), if water expansion forming is performed directly, the target cup shape cannot be formed due to insufficient water expansion; and if shrinkage processing 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, it is necessary to improve the above problems, break through the limitations of the water expansion range of titanium tubes, and solve the problems of difficult processing, low efficiency, high cost and unstable product quality in traditional forming processes. Summary of the Invention

[0007] The present invention aims to solve the defects of the prior art such as great processing difficulty, low efficiency, high cost and unstable product quality, and provides a new water expansion forming process for titanium thermos cups.

[0008] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: A water expansion forming process for a titanium thermos cup comprises the following steps: S1: Take a titanium tube, cut the titanium tube 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 a water-swelling mold and water-swell the semi-finished tube body C to obtain a semi-finished tube body D. Finally, shrink the semi-finished tube body D to obtain the cup body of the titanium thermos cup.

[0009] Step S1 precisely cuts the titanium tube to length, providing a base stock with the correct dimensions for subsequent steps like tube shrinking and water expansion, thus avoiding machining errors and material waste caused by inappropriate tube length. Furthermore, a uniform initial length ensures stable tube positioning in subsequent steps, reduces processing losses caused by inconsistent blank dimensions, and lays the foundation for improved product consistency. The initial shrinking process with shrinking die A initially reduces the diameter of the titanium tube to meet subsequent processing requirements. Compared to traditional shrinking machines, using a shrinking die in conjunction with a hydraulic extrusion press offers the following advantages: shorter processing time, improved single-step efficiency; smooth, seamless transitions between all parts of the tube, eliminating the marks left by the shrinking machine and improving appearance quality; and high dimensional stability, reducing debugging losses and providing a precise intermediate stock for the subsequent secondary shrinking process. For products with larger shrinkage widths (such as those with a large gap between the top and bottom), the secondary shrinking process uses step-by-step shrinking to achieve precise and gradual adjustment of tube dimensions, avoiding deformation and wrinkling caused by excessive shrinking in a single step. At the same time, the cooperation between the tube-collecting molds A and B can realize the gradient adjustment of the tube shape, further improve the dimensional accuracy of the tube, solve the problem in the traditional process that "the 75mm diameter titanium tube cannot be directly formed by water expansion", and create suitable conditions for the subsequent water expansion process.

[0010] In step S2, the size of the semi-finished tube body C after two tube collections has been adapted to the water expansion requirements, which can effectively reduce the limitation of the water expansion range of the titanium tube. During the water expansion process, the tube body fits the shape of the mold cavity under the combined action of water pressure and the mold cavity. Because the semi-finished tube body C has precise dimensions and high consistency, the semi-finished tube body D obtained after water expansion has good appearance stability and precise dimensions, which solves the problem of product quality differences caused by traditional eccentric mold processing. The final necking process can accurately control the size of the cup body mouth, so that the product shape fully meets the design requirements (especially special-shaped structures with a large difference between the mouth and the bottom). This step further improves the product structure, ensures the functional indicators of the cup body such as sealing and assembly, and enhances the product's practicality and market competitiveness.

[0011] The present invention forms a complete solution for the molding of titanium thermos cups through the collaborative process of "cutting - two-step tube shrinking - water expansion - final necking." This comprehensively solves the problems of limited water expansion of titanium tubes, high processing difficulty, low efficiency, high loss, and poor product consistency in traditional processes. It breaks through material limitations: By shrinking the tube twice in steps, the required water expansion of the titanium tube is reduced, overcoming the inherent limitation of titanium material's small water expansion, and realizing the molding of complex shapes such as large bottom drop. It improves production efficiency and cost control: Compared with traditional eccentric mold processing or necking machine processing, this process uses a hydraulic press and a dedicated mold to shrink the tube, which shortens processing time, reduces debugging loss, and is dimensionally stable. It significantly reduces production uncertainty and resource waste, and improves production efficiency. It optimizes product quality: The various processes work together to ensure the dimensional accuracy, appearance integrity (no joint marks or knife marks), and consistency of the tube body from blank to finished product, improving product quality control. It expands the scope of application: It is not only applicable to titanium cups, but can also be extended to stainless steel cups, with wide technical applicability and industrial value.

[0012] Preferably, in the above-described water expansion forming process for a titanium thermos cup, the tube collecting mold A and the tube collecting mold B both include an upper tube collecting mold cavity and a lower tube collecting mold cavity that cooperate with each other, the upper tube collecting mold cavity is connected to the tube collecting mold frame flange, the upper tube collecting mold cavity is provided with a tube collecting material return block, the lower tube collecting mold cavity is connected to the tube collecting lower flange, and a tube collecting mold core is provided in the lower tube collecting mold cavity.

[0013] The precise coordination of the upper and lower mold cavities and the mold core enables the titanium tube to withstand large, step-by-step deformation during shrinking. This overcomes the inherent limitation of titanium material expansion (which makes direct shrinking of 75mm titanium tubes difficult in traditional processes) and creates ideal billet conditions for subsequent shrinking. The stripper block and flange system ensure efficient demolding and stable equipment operation, significantly improving the feasibility and yield rate of complex titanium thermos designs. The coordinated integration of four core features, namely, a precisely constrained mold cavity, a rigid flange connection, an automatic stripper mechanism, and internal mold core guidance, systematically addresses the challenges of precision, efficiency, stability, and automated adaptability in the titanium tube shrinking process.

[0014] Preferably, in the above-described water expansion forming process for a titanium thermos cup, the head of the tube-collecting mold core of the tube-collecting mold A is an outward-expanding arc structure, and the head of the tube-collecting mold core of the tube-collecting mold B is an inward-concave arc structure.

[0015] The outward-flaring curved structure smoothly guides the plastic deformation of semi-finished tube A during the first shrinking process, distributing stress along the curved surface and avoiding localized stress concentration that can lead to wrinkles, cracks, or uneven wall thickness. This is particularly suitable for materials such as titanium, which are difficult to cold-work and prone to defects. The inward-flaring curved structure complements the outward-flaring curved surface of semi-finished tube B to further guide the material toward the target size during the second shrinking process, ensuring a controllable shrinking range and precise dimensions.

[0016] Preferably, in the above-described water expansion forming process for a titanium thermos cup, the water expansion mold includes a water expansion mold cavity, the lower side of the water expansion mold cavity is sequentially connected to a water expansion mold cavity seat and a water expansion mold cavity seat flange, an upper water expansion core rod and a lower water expansion core rod are arranged in the water expansion mold cavity, and a water expansion mold cavity cylinder is arranged outside the water expansion mold cavity.

[0017] The various components of the hydro-expansion mold work together to systematically address the precision, stability, and reliability challenges associated with hydro-expansion forming of titanium tubes, improving both precision and consistency. The precise cavity of the hydro-expansion mold and the positioning of the upper and lower hydro-expansion mandrels ensure that the tube conforms perfectly to the mold shape under water pressure, avoiding dimensional fluctuations caused by unconstrained or misaligned positioning in traditional processes. The rigid fixing of the hydro-expansion mold seat to the flange ensures concentricity in the mold installation, minimizing shape variations across batches and addressing the issue of poor product consistency.

[0018] Preferably, in the above-described water expansion forming process for a titanium thermos cup, the water expansion upper core rod is sequentially connected to the water expansion upper core seat and the water expansion upper flange, a water expansion upper mold heightening block is provided outside the water expansion upper core seat, and the water expansion lower core rod is sequentially connected to the water expansion lower core seat and the water expansion lower flange, and a water expansion lower mold heightening block is provided outside the water expansion lower core seat.

[0019] The combination of the upper and lower water-expansion mandrel connection structure and the upper and lower mold heightening blocks, through a collaborative design of "rigid fixation + flexible adjustment," systematically addresses the issues of inaccurate mandrel positioning, poor stability, and low adaptability encountered in traditional water-expansion processes. This improves forming precision and stability, better adapts to the characteristics of titanium, breaks through forming bottlenecks, and avoids cracking or wrinkling caused by titanium's small water expansion amplitude and poor cold working properties, further breaking through the technical limitations of titanium forming.

[0020] Preferably, in the above-mentioned water expansion forming process for a titanium thermos cup, step S1 of collecting the semi-finished tube body A comprises the following steps: Install the tube-collecting mold A on the hydraulic press table, and calibrate the concentricity of the upper mold cavity and the lower mold cavity of the tube-collecting mold A. Then insert the semi-finished tube body A into the gap between the lower mold cavity and the tube-collecting mold core of the tube-collecting mold A. Then turn on the hydraulic press. Driven by the upper cylinder of the hydraulic press, the upper mold cavity of the tube-collecting mold A descends and generates a force to extrude the semi-finished tube body A through the inner shape of the upper mold cavity of the tube-collecting mold A to collect the semi-finished tube body A. At the same time, the upper cylinder of the hydraulic press will extend a punching rod to generate a thrust on the tube-collecting and material-removing block of the tube-collecting mold A to remove the material.

[0021] The hydraulic press table provides rigid support for the tube-retracting mold A, ensuring stable force during high-pressure extrusion and preventing machining deviations caused by mold sway. Correcting the concentricity of the upper and lower mold cavities is key to ensuring uniform tube deformation. This effectively prevents localized overextrusion or uneven force on the tube caused by mold eccentricity, reduces defects such as cracking and wrinkling in titanium tubes (titanium has poor cold working properties), and lays the foundation for subsequent tube-retracting accuracy. The gap between the lower mold cavity and the mold core provides precise positioning space for the semi-finished tube A, ensuring that the tube is in the preset processing position before extrusion and avoiding dimensional deviations caused by tube offset. This gap design constrains the tube's deformation range, guiding the tube to deform only in a controlled manner along the mold cavity, preventing tube instability caused by unconstrained extrusion. This is particularly suitable for materials such as titanium that are prone to machining defects. The hydraulic press's upper cylinder drive provides stable and controllable extrusion pressure. Compared with the mechanical shrinking of traditional shrinking machines, it can achieve precise control of pressure parameters, ensure uniform shrinking force, and improve the dimensional stability of the semi-finished tube body B. The inner shape of the upper die cavity directly determines the contour of the tube body after shrinking. The preset inner shape guides the uniform flow of the tube body material, achieving "smooth arc transitions and no joints in all parts", avoiding the appearance defects of the shrinking machine's "obvious shrinking knife marks" and improving the product's appearance quality. The punching rod and the material removal block cooperate to realize automatic material removal, eliminating the need for manual prying or dragging of the semi-finished tube body B after forming, avoiding secondary damage such as tube deformation and surface scratches caused by manual intervention, and ensuring the integrity of the semi-finished tube body B. Automatic material removal shortens the cycle time of a single tube shrinking, reduces equipment idleness, improves production efficiency, and reduces the safety hazards of manual operation.

[0022] Preferably, in the above-mentioned water expansion forming process for a titanium thermos cup, step S1 of collecting the semi-finished tube body B comprises the following steps: Install the tube-collecting mold B on the table of the hydraulic press, and calibrate the concentricity of the upper mold cavity and the lower mold cavity of the tube-collecting mold B. Then insert the semi-finished tube body B into the gap between the lower mold cavity and the tube-collecting mold core of the tube-collecting mold B. Then turn on the hydraulic press. Driven by the upper cylinder of the hydraulic press, the upper mold cavity of the tube-collecting mold B descends and generates a force to extrude the semi-finished tube body B through the inner shape of the upper mold cavity of the tube-collecting mold B to collect the semi-finished tube body B. At the same time, the upper cylinder of the hydraulic press will extend a punching rod to generate a thrust on the tube-collecting and material-removing block of the tube-collecting mold B to remove the material.

[0023] The above steps, through the continuous process of "mold installation and concentricity correction - tube body B positioning - hydraulically driven extrusion - automatic material unloading", serve as the secondary tube collection process. Together with the initial tube collection, they solve the problems of the traditional tube collection process such as "difficult processing when the tube width is large, dimensional instability, and many defects" in the traditional tube collection process.

[0024] Preferably, in the above-mentioned water expansion forming process for a titanium thermos cup, step S2 of water-expanding the semi-finished tube body C comprises the following steps: Install the water expansion mold on the hydraulic press table, and calibrate the concentricity of the water expansion upper core rod and the water expansion lower core rod of the water expansion mold. Insert the semi-finished tube body C into the water expansion mold cavity. Adjust the equipment parameters as needed. The water expansion upper core rod will be molded with the water expansion lower core rod under the drive of the hydraulic press upper cylinder. The main cylinder of the hydraulic press will inject water into the water expansion mold cavity and apply pressure. The semi-finished tube body C is expanded by squeezing the water and the inner shape of the water expansion mold cavity.

[0025] The aforementioned hydraulic expansion steps, through a coherent process of "mold installation and concentricity correction - tube positioning - parameter adjustment - mold closing - hydraulic expansion," work in conjunction with the two previous tube collection steps to systematically address the core technical challenges of hydraulic expansion forming of titanium tubes. This overcomes the limitations of titanium material expansion, improves forming precision and quality, optimizes production efficiency and costs, and strengthens process synergy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the cup body of the present invention; Figure 2 Schematic diagram of the structure of the semi-finished tube body A in the present invention; Figure 3 Schematic diagram of the structure of the semi-finished tube body B in the present invention; Figure 4 Schematic diagram of the structure of the semi-finished tube body C in the present invention; Figure 5 Schematic diagram of the structure of the semi-finished tube body D in the present invention; Figure 6 Schematic diagram of the structure of the tube collecting mold A in the present invention; Figure 7 Schematic diagram of the explosion of the tube collecting mold A in the present invention; Figure 8 Schematic diagram of the structure of the tube collecting mold B in the present invention; Figure 9 Schematic diagram of the explosion of the tube collecting mold B in the present invention; Figure 10 Schematic diagram of the structure of the water expansion mold in the present invention; Figure 11 Schematic diagram of the explosion of the water expansion mold in the present invention. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-11 The present invention is further described in detail with specific embodiments, but they are not intended to limit the present invention: A water expansion forming process for a titanium thermos cup comprises the following steps: S1: Take a titanium tube and cut it into the required length to obtain a semi-finished tube body A1. Take a tube collecting mold A and collect the semi-finished tube body A1 to obtain a semi-finished tube body B2. Take a tube collecting mold B and collect the semi-finished tube body B2 to obtain a semi-finished tube body C3. S2: Take a water-swelling mold and water-swell the semi-finished tube body C3 to obtain a semi-finished tube body D4. Finally, shrink the semi-finished tube body D4 to obtain the cup body of the titanium thermos cup.

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

[0029] Preferably, the head of the tube-collecting mold core 55 of the tube-collecting mold A is an outward-expanding arc-shaped structure, and the head of the tube-collecting mold core 55 of the tube-collecting mold B is an inward-concave arc-shaped structure.

[0030] Preferably, the water expansion mold includes a water expansion mold cavity 6, the lower side of which is connected in sequence to a water expansion mold cavity seat 61 and a water expansion mold cavity seat flange 62, an upper water expansion core rod 7 and a lower water expansion core rod 8 are arranged inside the water expansion mold cavity 6, and a water expansion mold cavity cylinder 63 is arranged outside the water expansion mold cavity 6.

[0031] Preferably, the water-expanding upper core rod 7 is sequentially connected to the water-expanding upper core seat 71 and the water-expanding upper flange 72, and a water-expanding upper mold raising block 73 is provided outside the water-expanding upper core seat 71. The water-expanding lower core rod 8 is sequentially connected to the water-expanding lower core seat 81 and the water-expanding lower flange 82, and a water-expanding lower mold raising block 83 is provided outside the water-expanding lower core seat 81.

[0032] Preferably, step S1 of collecting the semi-finished tube body A1 includes the following steps: Install the tube-collecting mold A on the table of the hydraulic press, and calibrate the concentricity of the upper mold cavity 5 and the lower mold cavity 51 of the tube-collecting mold A. Then insert the semi-finished tube body A1 into the gap between the lower mold cavity 51 and the tube-collecting mold core 55 of the tube-collecting mold A. Then open the hydraulic press. Driven by the upper cylinder of the hydraulic press, the upper mold cavity 5 of the tube-collecting mold A descends and generates a force to extrude the semi-finished tube body A1 through the inner shape of the upper mold cavity 5 of the tube-collecting mold A to collect the semi-finished tube body A1. At the same time, the upper cylinder of the hydraulic press will extend a punching rod to generate a thrust on the tube-collecting and material-removing block 53 of the tube-collecting mold A to remove the material.

[0033] Preferably, step S1 of collecting the semi-finished pipe body B2 includes the following steps: Install the tube-collecting mold B on the table of the hydraulic press, and calibrate the concentricity of the upper mold cavity 5 and the lower mold cavity 51 of the tube-collecting mold B. Then insert the semi-finished tube body B2 into the gap between the lower mold cavity 51 and the tube-collecting mold core 55 of the tube-collecting mold B. Then open the hydraulic press. Driven by the upper cylinder of the hydraulic press, the upper mold cavity 5 of the tube-collecting mold B descends and generates a force to extrude the semi-finished tube body B2 through the inner shape of the upper mold cavity 5 of the tube-collecting mold B to collect the semi-finished tube body B2. At the same time, the upper cylinder of the hydraulic press will extend a punching rod to generate a thrust on the tube-collecting and material-removing block 53 of the tube-collecting mold B to remove the material.

[0034] Preferably, step S2 of water-swelling the semi-finished tube body C3 comprises the following steps: The water expansion mold is installed on the hydraulic press table, and the concentricity of the water expansion upper core rod 7 and the water expansion lower core rod 8 of the water expansion mold is calibrated. The semi-finished tube body C3 is inserted into the water expansion mold cavity 6. The equipment parameters are adjusted as needed. The water expansion upper core rod 7 will be molded with the water expansion lower core rod 8 under the drive of the hydraulic press upper cylinder. The main cylinder of the hydraulic press will inject water into the water expansion mold cavity 6 and apply pressure. The semi-finished tube body C3 is expanded by squeezing the water and the inner shape of the water expansion mold cavity 6.

[0035] like Figure 1-5 As shown, the titanium tube is processed by the process of the present invention to obtain the desired titanium insulation cup body. Figure 6-9 As shown, the head of the tube-collecting mold core 55 of the tube-collecting mold A is an outward-expanding arc structure, and the head of the tube-collecting mold core 55 of the tube-collecting mold B is an inward-concave arc structure. Figure 10-11 As shown, a semi-finished tube body D4 is obtained by a water expansion mold.

[0036] In short, the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A titanium thermos cup water expansion forming process, characterized by: The following steps are involved: S1: Take a titanium tube, cut the titanium tube to the required length, obtain a semi-finished tube body A (1), take a tube collecting mold A, collect the semi-finished tube body A (1), obtain a semi-finished tube body B (2), take a tube collecting mold B, collect the semi-finished tube body B (2), obtain a semi-finished tube body C (3); S2: Take a water-swelling mold, swell the semi-finished tube body C (3) with water, and obtain a semi-finished tube body D (4). Finally, shrink the semi-finished tube body D (4) to obtain the cup body of the titanium thermos cup.

2. The water expansion forming process of a titanium thermos cup according to claim 1, characterized in that: The tube collecting mold A and the tube collecting mold B both include an upper tube collecting mold cavity (5) and a lower tube collecting mold cavity (51) that cooperate with each other. The upper tube collecting mold cavity (5) is connected to a tube collecting mold frame flange (52). The upper tube collecting mold cavity (5) is provided with a tube collecting material return block (53). The lower tube collecting mold cavity (51) is connected to a tube collecting lower flange (54). A tube collecting mold core (55) is provided in the lower tube collecting mold cavity (51).

3. The water expansion forming process of a titanium thermos cup according to claim 2, characterized in that: The head of the tube-collecting mold core (55) of the tube-collecting mold A is an outwardly expanding arc-shaped structure, and the head of the tube-collecting mold core (55) of the tube-collecting mold B is an inwardly concave arc-shaped structure.

4. The water expansion forming process of a titanium thermos cup according to claim 1, characterized in that: The water expansion mold comprises a water expansion mold cavity (6), the lower side of the water expansion mold cavity (6) is connected in sequence to a water expansion mold cavity seat (61) and a water expansion mold cavity seat flange (62), an upper water expansion core rod (7) and a lower water expansion core rod (8) are arranged in the water expansion mold cavity (6), and a water expansion mold cavity cylinder (63) is arranged outside the water expansion mold cavity (6).

5. The water expansion forming process of a titanium thermos cup according to claim 4, characterized in that: The water-expanding upper core rod (7) is sequentially connected to the water-expanding upper core seat (71) and the water-expanding upper flange (72); a water-expanding upper die heightening block (73) is provided outside the water-expanding upper core seat (71); the water-expanding lower core rod (8) is sequentially connected to the water-expanding lower core seat (81) and the water-expanding lower flange (82); a water-expanding lower die heightening block (83) is provided outside the water-expanding lower core seat (81).

6. The water expansion forming process of a titanium thermos cup according to claim 3, characterized in that: Step S1: Collect the semi-finished tube body A (1) The following steps are involved: The tube-collecting mold A is mounted on the hydraulic press table, and the concentricity of the tube-collecting upper mold cavity (5) and the tube-collecting lower mold cavity (51) of the tube-collecting mold A is corrected. Then, the semi-finished tube body A (1) is inserted into the gap between the tube-collecting lower mold cavity (51) and the tube-collecting mold core (55) of the tube-collecting mold A. Then, the hydraulic press is opened. The tube-collecting upper mold cavity (5) of the tube-collecting mold A is driven by the upper cylinder of the hydraulic press to descend and generate a force to squeeze the semi-finished tube body A (1) through the inner shape of the tube-collecting upper mold cavity (5) of the tube-collecting mold A to collect the semi-finished tube body A (1). At the same time, the upper cylinder of the hydraulic press will have a punching rod extending out to generate a thrust on the tube-collecting material removal block (53) of the tube-collecting mold A to remove the material.

7. The water expansion forming process for a titanium thermos cup according to claim 3, characterized in that: Step S1 of collecting the semi-finished tube body B (2) includes the following steps: The tube-collecting mold B is mounted on the hydraulic press table, and the concentricity of the tube-collecting upper mold cavity (5) and the tube-collecting lower mold cavity (51) of the tube-collecting mold B is corrected. Then, the semi-finished tube body B (2) is inserted into the gap between the tube-collecting lower mold cavity (51) and the tube-collecting mold core (55) of the tube-collecting mold B. Then, the hydraulic press is opened. The tube-collecting upper mold cavity (5) of the tube-collecting mold B is driven by the upper cylinder of the hydraulic press to descend and generate a force to squeeze the semi-finished tube body B (2) through the inner shape of the tube-collecting upper mold cavity (5) of the tube-collecting mold B to collect the semi-finished tube body B (2). At the same time, the upper cylinder of the hydraulic press will have a punching rod extending out to generate a thrust on the tube-collecting material removal block (53) of the tube-collecting mold B to remove the material.

8. The water expansion forming process for a titanium thermos cup according to claim 5, characterized in that: Step S2, in which the semi-finished tube body C (3) is subjected to water expansion, comprises the following steps: The water expansion mold is mounted on the hydraulic press table, and the concentricity of the water expansion upper core rod (7) and the water expansion lower core rod (8) of the water expansion mold is corrected. The semi-finished tube body C (3) is inserted into the water expansion mold cavity (6). The equipment parameters are adjusted as needed. The water expansion upper core rod (7) is driven by the upper cylinder of the hydraulic press to close the mold with the water expansion lower core rod (8). The main cylinder of the hydraulic press will inject water into the water expansion mold cavity (6) and apply pressure. The semi-finished tube body C (3) is expanded by squeezing the water and the inner shape of the water expansion mold cavity (6).

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