High-pressure-resistant titanium or titanium alloy square box containing transition metal layer and manufacturing method of high-pressure-resistant titanium or titanium alloy square box

Abstract

The invention discloses a high-pressure-resistant titanium or titanium alloy square box containing a transition metal layer and a manufacturing method of the high-pressure-resistant titanium or titanium alloy square box. The titanium or titanium alloy square box comprises a square box body with the wall thickness smaller than 0.5 mm. The top surface of the square box body is provided with two opening plates which can be bent oppositely; transition metal layers are arranged on the edges of the opening portions of the two sides of the square box body. The two opening plates are oppositely bent, so that a butt joint seam is formed between the two opening plates which are opposite left and right; and the butt seams are welded through a welding machine, so that the transition metal layers on the two sides of the square box body form an integrated structure to enhance the strength of the opening parts on the two sides of the titanium or titanium alloy box. By adopting the arrangement, the material use and the process are optimized, and the opening part of the titanium material sealing box body is welded after being thickened, so that the structural strength of the opening part of the titanium material sealing box is improved, and meanwhile, the air tightness of the box is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of titanium and titanium alloy box welding, and specifically relates to a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer and a manufacturing method thereof, aiming to improve the overall strength and pressure resistance of the square titanium or titanium alloy box to meet its use requirements in high-pressure environments. Background Art

[0002] Titanium and its alloys are widely used in a wide range of fields, including aerospace, marine engineering, and medical devices, due to their low density, high strength, and corrosion resistance. Square titanium boxes are a common structural form, often used to store or protect internal equipment and materials.

[0003] In practical applications, square titanium boxes often require pressure testing to ensure they function properly under specific pressure environments. Existing titanium sealed boxes, after being welded using traditional welding methods, exhibit significant flaws in their structural strength, sealing performance, process reliability, and safety redundancy, as the thickness of the titanium sealed box is less than 0.5 mm. Specifically, the following are the following: ① The welded opening is structurally weak and susceptible to damage from internal stress; ② The risk of sealing failure is high; ③ The process adaptability is poor, and the welding process has a low fault tolerance, affecting production consistency and preventing 100% strength assurance.

[0004] However, there is no design in the existing technology that thickens the mouth of a titanium sealed box and then welds it; and traditional welding processes are still unable to achieve the function of thickening and widening the mouth of a titanium box with a thickness of less than 0.5 mm. Therefore, it is very challenging to achieve local thickening and widening welding on plates with a thickness of less than 0.5 mm. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer and a method for manufacturing the same. By optimizing material usage and process, the mouth of the titanium material sealed box body can be thickened and then welded to improve the structural strength of the mouth of the titanium material sealed box and at the same time improve the airtightness of the box.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A high-pressure resistant titanium or titanium alloy square box containing a transition metal layer comprises a square box body with a wall thickness of less than 0.5 mm; the top surface of the square box body is provided with two opening plates that can be bent relative to each other; the edges of the openings on both sides of the square box body are provided with a transition metal layer; the two opening plates are bent relative to each other so that a butt joint is formed between the two opening plates facing each other on the left and right; the butt joint is welded by a welding machine so that the transition metal layers on both sides of the square box body form an integrated structure to enhance the strength of the openings on both sides of the titanium or titanium alloy box.

[0008] Furthermore, the square box body includes a base plate and two cover plates; the transition metal layer is arranged on the edges of both sides of the base plate; the two ends of the base plate are bent to form the opening plate, and the middle part of the base plate is bent in opposite directions along two bending lines to form a square shell; the two cover plates are respectively welded to the openings on both sides of the square shell by a welding machine.

[0009] Furthermore, the square box body and the transition metal layer are made of different materials. The square box body is made of TA1 pure titanium or TC4 titanium alloy; the transition metal layer is made of TA1 pure titanium or TC4 titanium alloy.

[0010] Furthermore, the transition metal layer is a rectangular parallelepiped structured metal layer, and the two rectangular parallelepiped structured metal layers are respectively arranged on the edges of the openings on both sides of the square box body.

[0011] Alternatively, the transition metal layer includes an integrally formed rectangular parallelepiped structured metal layer and a wedge-shaped metal layer, such that the transition metal layer becomes thinner from the edge of the mouth of the square box body toward the inside.

[0012] Furthermore, the size of the base plate is 100 mm×260 mm×0.2 mm, and the size of the transition metal layer is 4 mm×260 mm×0.2 mm.

[0013] A method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer comprises the following steps:

[0014] 1) Sheet cutting: laser cutting the sheet according to size to form the base sheet;

[0015] 2) Thickening treatment: The edges of both sides of the substrate are thickened to form the transition metal layer;

[0016] 3) Bending: First, the two ends of the base plate are bent to form the opening plate, and then the two bending lines in the middle of the base plate are bent, and finally the openings at both ends of the base plate are butted together to form the square shell;

[0017] 4) Welding into a box: The high-pressure resistant titanium or titanium alloy square box is formed by laser welding the corresponding positions at both ends of the base plate in the square shell and laser welding the cover plates at both sides of the square shell.

[0018] Furthermore, in the thickening step, the following method is adopted:

[0019] The base plate is placed on the workbench of the laser welding machine, and the two cut transition metal layers are placed on the two side edges of the base plate. The designed tooling fixture is placed on both sides of the base plate. An argon gas input port and a laser heating port facing the transition metal layer are set on the tooling fixture. The argon gas input port supplies argon gas to the transition metal layer to create an inert protective environment. The laser heating port preheats the base plate and transition metal layer to be welded as a whole through laser heating. The laser welding machine positions the transition metal layers on both sides of the base plate, and uses laser oscillation welding to weld the transition metal layer and the base plate into one.

[0020] Alternatively, in the thickening step, the following method is used:

[0021] The base plate is placed in the tooling to be clad of the laser cladding equipment, and the laser cladding equipment locates the areas to be laser clad on the edges of both sides of the base plate; the powder feeder of the laser cladding equipment feeds pure titanium powder or titanium alloy powder to the area to be laser clad, and the laser generator of the laser cladding equipment synchronously irradiates the generated laser beam to the area to be laser clad, so that the pure titanium powder or titanium alloy powder is clad by the laser beam to form the transition metal layer.

[0022] Alternatively, in the thickening step, the following method is used:

[0023] The substrate plate is placed on the forming workbench of the SLM metal printer, and the SLM metal printer locates the areas to be printed on both sides of the substrate plate; the powder feeder of the SLM metal printer spreads a layer of pure titanium powder or titanium alloy powder on the area to be printed, and then the laser generator of the SLM metal printer performs laser scanning on the spread pure titanium powder or titanium alloy powder, thereby forming the transition metal layer by layer of powder spreading and laser scanning.

[0024] Furthermore, before the plate cutting step, the plate needs to be heat-treated and shaped to remove stress; before the bending and forming step, the base plate that has undergone thickening treatment needs to be heat-treated and shaped to remove stress.

[0025] Furthermore, in the bending forming step, the following method is adopted: first, bending lines are marked on both ends and the middle of the base plate; then, a V-groove mold is used to bend the base plate along the bending lines at both ends, so that the bending angle of one end of the base plate is 90 degrees and the bending angle of the other end is 60 degrees; then, the V-groove mold is used to bend the base plate 90 degrees in opposite directions along the two bending lines in the middle of the base plate; then, the bending angle of 60 degrees at one end of the base plate is bent to 90 degrees, so that the mouths at both ends of the base plate are connected; and finally, a square shell is formed.

[0026] Furthermore, it also includes: 5) performance testing: ① using airtight testing equipment to test the airtightness of the welded high-pressure resistant titanium or titanium alloy square box; ② using pressure-resistant equipment to test the pressure resistance of the welded high-pressure resistant titanium or titanium alloy square box.

[0027] The present invention has the following beneficial effects:

[0028] 1. The mouth additive technology containing a transition metal layer in the present invention can achieve structural strengthening, specifically realizing "on-demand strengthening" (i.e., it can improve the pressure resistance of the mouth of a titanium or titanium alloy square box). The transition metal layer is added to the mouth that needs to be strengthened through three methods (laser welding, laser cladding, and SLM metal 3D printing) to improve the strength of the mouth structure, which is 10% higher than the previous case without the addition.

[0029] 2. The mouth of the titanium or titanium alloy square box of this invention is the core sealing area (such as the terminal welding area of ​​a battery casing). Traditional processes (such as rubber sealing rings and welding seals) are prone to seal failure due to assembly errors and temperature deformation. The additive mouth thickening technology achieves a qualitative leap in sealing performance through dynamic adaptation and micro-densification.

[0030] 3. The present invention improves material utilization by using the mouth thickening technology of titanium or titanium alloy square boxes: additive manufacturing (such as selective laser melting (SLM)) can directly deposit materials on demand at the mouth, with a material utilization rate of over 95%, which is much higher than traditional casting (about 60%) and cutting (about 30%). Lightweight and high strength coexist, and the additive mouth thickening technology can increase the overall weight by 8%, improve the pressure resistance by 20%, and indirectly increase the energy density of the battery system by 12%. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the high-pressure resistant titanium or titanium alloy square box of the present invention.

[0032] Figure 2 It is a structural schematic diagram of a square shell formed by bending a base plate of the present invention.

[0033] Figure 3 It is a structural schematic diagram of the base plate of the present invention.

[0034] Figure 4 It is a plan view of a base plate material with a transition metal layer according to the present invention.

[0035] Figure 5 This is a schematic diagram of the base plate and transition metal layer subjected to the mouth thickening treatment using laser welding technology in the present invention.

[0036] Figure 6 This is a schematic diagram of the base plate and transition metal layer subjected to the mouth thickening treatment using laser cladding or SLM metal 3D printing technology of the present invention.

[0037] In the figure: 1, square box body; 11, opening plate; 111, butt joint; 12, mouth; 2, cover plate; 3, transition metal layer; 4, base plate; 5, square shell. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Terms such as "upper," "inner," "middle," "left," "right," and "one" used in this specification are for ease of description and are not intended to limit the scope of the present invention. Changes or adjustments to these terms, without substantially altering the technical content, are also considered within the scope of the present invention.

[0039] The high-pressure resistant titanium or titanium alloy square box of the present invention is mainly used for sealing, storing or protecting internal equipment and materials, and is widely used in many fields such as aerospace, marine engineering, and medical equipment.

[0040] The mouth 12 (i.e., the side edge) of titanium and titanium alloy boxes in the prior art does not have a thickened design. However, titanium and titanium alloy boxes are relatively thin, typically less than 0.5 mm. Using traditional welding methods to weld this mouth 12 often presents the following problems: ① The welded mouth 12 may have insufficient structural strength, making it susceptible to internal stress damage; ② The risk of sealing failure is high; ③ The process adaptability is poor, and the welding process has a low tolerance for errors. Furthermore, conventional welding processes in the prior art are unable to achieve widened and thickened welding on the mouth 12 of titanium and titanium alloy boxes with a thickness of less than 0.5 mm.

[0041] Therefore, the present invention has developed and manufactured a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer. The mouth 12 of this titanium or titanium alloy square box is provided with a transition metal layer 3 to locally thicken it before welding. This allows the thickened portion and the weld to form an integral structure, thereby increasing the width and depth of the weld. This increases the stress area of ​​the titanium or titanium alloy square box during compression, tension, and shear forces, expands the welding process window, and improves welding stability, thereby improving the pressure resistance and pressure stability of the entire titanium or titanium alloy square box; at the same time, it can also improve the airtightness of the titanium or titanium alloy square box. In addition, by locally providing the transition metal layer 3 at the box mouth 12, the strength requirements of a specific portion (the titanium or titanium alloy square box mouth 12) can be met without increasing the overall thickness of the titanium or titanium alloy box, thereby helping to reduce the overall weight and improve the overall energy density.

[0042] The following describes the high-pressure resistant titanium or titanium alloy square box containing a transition metal layer 3 and its manufacturing method through multiple embodiments of the present invention:

[0043] Example 1

[0044] A high-pressure resistant titanium or titanium alloy square box containing a transition metal layer 3, such as Figure 1 and Figure 2 As shown, it includes a square box body 1 with a wall thickness of less than 0.5 mm; the top surface of the square box body 1 has two relatively bendable opening plates 11, and the edges of the mouth 12 on both sides of the square box body are provided with a transition metal layer 3 by laser welding technology, laser cladding technology or metal 3D printing technology to thicken the edges of the mouth 12 on both sides of the square box body; the two opening plates 11 of the square box body 1 are relatively bent so that a butt joint 111 is formed between the two opposite opening plates on the left and right; the butt joint 111 is laser welded by a laser welding machine to form an integral high-pressure resistant titanium or titanium alloy square box, and at the same time, the transition metal layers 3 of the mouths 12 on both sides form an integrated structure to enhance the strength of the mouth 12 of the titanium or titanium alloy square box.

[0045] Regarding the structure of the square box body 1: Figures 1 to 3As shown, the square box body 1 includes a base plate 4 and two cover plates 2. The base plate is rectangular, and the transition metal layer is provided on the edges of both sides of the base plate by laser welding technology, laser cladding technology or metal 3D printing technology. The two ends of the base plate 4 are bent to form an opening plate 11, and the middle part of the base plate 4 is bent in opposite directions along two bending lines to form a square shell 5. The four sides of the two cover plates 2 are laser welded to the mouth 12 of the square shell 5 by a laser welding machine. It can be seen that the square box body 1 is mainly made by bending the base plate 4 and then welding the cover plates 2 to the two ends of the square shell 5. Therefore, it can be ensured that the thickness of each side of the square box body 1 remains relatively consistent, and the stability of the overall structure can be maintained. At the same time, by welding the cover plates, the edges of the mouth 12 on both sides of the square box body are thickened by the transition metal layer to enhance the structural structure and sealing of the square box body.

[0046] Regarding the material of the square box body: the materials of the square box body 1 and the transition metal layer 3 are different; the material of the square box body is TA1 pure titanium material or TC4 titanium alloy; the material of the transition metal layer is TA1 pure titanium material or TC4 titanium alloy.

[0047] Regarding the shape and structure of the transition metal layer 3: Figure 5 As shown, the transition metal layer 3 is a rectangular parallelepiped structure metal layer, and the two rectangular parallelepiped structure metal layers are respectively arranged at the edges of the opening 12 on both sides of the square box body. Figure 6 As shown, the transition metal layer 3 includes an integrally formed rectangular parallelepiped structure metal layer and a wedge-shaped metal layer, so that the transition metal layer 3 becomes thinner from the edge of the mouth 12 of the square box body 1 toward the inside.

[0048] By defining the shape of the transition metal layer 2, the transition metal layer 3 can completely cover the entire edge of the opening 12 of the titanium or titanium alloy box. The rectangular structured metal layer and the wedge-shaped metal layer can increase the structural stress of the transition metal layer 3 in multiple directions, thereby further improving the structural strength and pressure resistance of the titanium or titanium alloy square box of the present invention at the opening 12. After welding the butt joint 111, the overall sealing of the butt joint 111 can be ensured, thereby improving the airtightness of the titanium or titanium alloy square box of the present invention.

[0049] Regarding the dimensions of the substrate 4 and transition metal layer 3: The dimensions of the high-pressure-resistant titanium or titanium alloy square box of the present invention are 110 mm x 20 mm x 100 mm; the dimensions of the substrate 4 of the present invention are 100 mm x 260 mm x 0.2 mm, and the dimensions of the transition metal layer 3 are 4 mm x 260 mm x 0.2 mm. By defining the dimensions of the substrate 4 and transition metal layer 3, accurate cutting and positioning are facilitated during the cutting and thickening processes.

[0050] To sum up, the high-pressure resistant titanium or titanium alloy square box containing a transition metal layer 3 of the present invention is mainly for improving the welding process and enhancing the weld performance by setting the transition metal layer 3 at the mouth 12 of the square box body 1 and limiting the materials of the square box body 1 and the transition metal layer 3; for example: using TA1 pure titanium as the transition metal layer 3 of the TC4 titanium alloy square box body 1 can solve the problem of insufficient elongation of the TC4 titanium alloy sheet, thereby improving the pressure resistance of the titanium or titanium alloy square box mouth 12; using TC4 titanium alloy as the transition metal layer 3 of the TA1 pure titanium square box body 1 can improve the strength of the weld, and improve the pressure resistance by improving the weld strength.

[0051] At the same time, the transition metal layer 3 is used to thicken the mouth 12 of the square box body 1 without increasing the overall thickness of the square box body 1, and can meet the strength requirements of the mouth 12 of the titanium or titanium alloy square box, which helps to reduce the overall weight and improve the body energy density; from the perspective of welding process, the thickening of the mouth 12 can increase the width and depth of the weld, increase the force area of ​​the titanium or titanium alloy square box during pressure, tension or shear force, expand the welding process window area, and improve the welding stability, thereby improving the pressure resistance value and pressure resistance stability of the entire box body. At the same time, the thickening technology of the mouth 12 can achieve dynamic adaptation and micro-densification during welding, thereby improving the sealing performance of the mouth 12.

[0052] Example 2

[0053] A method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer 3 as described in Example 1 comprises the following steps:

[0054] 1) Material selection: The material of the base plate is selected as TA1 pure titanium; the material of the transition metal layer is selected as TC4 titanium alloy.

[0055] 2) Sheet cutting and cleaning: laser cutting the sheet into a size (100 mm × 260 mm × 0.2 mm) to form the base sheet 4, and then removing edge burrs and surface stains of the base sheet 4;

[0056] 3) Thickening treatment: The openings 12 at both ends of the base plate 4 are thickened to form the transition metal layer 3 (such as Figures 4 to 6 As shown), the size of the transition metal layer is 4mm×260mm×0.2mm;

[0057] 4) Bending: First, bend the two ends 12 of the base plate 4, then bend the two bending lines in the middle of the base plate 4, and finally connect the ends 12 of the base plate 4 to form a square shell 5 with a size of 110mm×20mm×100mm (such as Figure 2 and 3 shown);

[0058] 5) Welding into a box: Laser welding the butt joints at the two ends of the base plate 4 in the square shell 5, and then laser welding the cover plate 2 at the openings 12 on both sides of the square shell 5 to form the high-pressure resistant titanium or titanium alloy square box (such as Figure 1 shown);

[0059] 6) Performance test: ① Use airtight testing equipment to test the airtightness of the welded high-pressure resistant titanium or titanium alloy square box; ② Use pressure-resistant equipment to test the pressure resistance of the welded high-pressure resistant titanium or titanium alloy square box.

[0060] In this embodiment, the step 2) of thickening treatment is mainly divided into the following three methods:

[0061] Method 1: If Figure 4 and 5 As shown, the thickening process is carried out by laser welding technology

[0062] The base plate 4 is placed on the workbench of the laser welding machine, and two transition metal layers 3, cut to corresponding sizes by laser, are placed on either side of the base plate 4. A fixture is designed and placed on either side of the base plate 4, with argon inlets and laser heating ports positioned toward the transition metal layers 3. The argon inlet delivers argon to the transition metal layers 3 to create an inert protective environment, thereby reducing oxidation of the base plate 4 and transition metal layers 3. The laser heating ports preheat the base plate 4 and transition metal layers 3 to be welded using laser heating to prevent uneven heating during the welding process. The laser welding machine (using a new type of laser oscillation welding machine) positions the transition metal layers 3 on either side of the base plate 4 and welds the transition metal layers 3 and base plate 4 together using laser oscillation welding, thereby thickening the edges of the base plate 4.

[0063] Method 2: If Figure 4 and Figure 6 As shown, the laser cladding technology is used for thickening

[0064] The substrate 4 is placed in the tooling to be clad of the laser cladding equipment. The laser cladding equipment locates the areas to be laser clad on both sides of the substrate 4. The powder feeder of the laser cladding equipment delivers titanium alloy powder to the area to be laser clad. The laser generator of the laser cladding equipment simultaneously irradiates the area with the generated laser beam, causing the titanium alloy powder to be melted by the laser beam energy to form a molten pool. After the laser beam leaves, the titanium alloy powder rapidly solidifies in the inert gas environment (such as argon) inside the laser cladding equipment, thereby forming the transition metal layer 3 through cladding.

[0065] Method 3, such as Figure 4 and Figure 6As shown, the SLM metal 3D printing technology is used for thickening treatment

[0066] The base plate 4 is placed on the forming workbench of the SLM metal printer, and the SLM metal printer positions the two sides of the base plate 4 to be printed by visual recognition. The powder feeder of the SLM metal printer spreads a layer of titanium alloy powder on the to-be-printed area, and then the laser generator of the SLM metal printer scans the titanium alloy powder according to the track to form a molten pool when the titanium alloy powder is scanned by the laser. After the laser beam leaves, the molten pool rapidly solidifies in the inert gas (such as argon) environment in the SLM metal printer, thereby forming the transition metal layer 3 by layer-by-layer powder spreading and laser scanning (10 layers of printing powder, each layer is 0.02mm thick, and the total thickness is 0.2mm).

[0067] In this embodiment, before the first plate cutting step and the cleaning step, the plate needs to be heat treated and shaped to remove stress, so as to facilitate laser cutting operation. Before the 3) bending forming step, the base plate 4 after thickening treatment needs to be heat treated and shaped to remove stress, so as to facilitate bending operation.

[0068] In this embodiment, in the third bending forming step, the following method is adopted: as shown in Figure 2 and Figure 3 (1) First, mark the bending lines at both ends and the middle of the base plate 4 with a marking pen. (2) Then, use a V-shaped groove die to bend along the bending lines at both ends of the base plate 4, so that the bending angle of one end of the base plate 4 is 90 degrees, and the bending angle of the other end is 60 degrees. (3) Then, use a V-shaped groove die to bend along the two bending lines in the middle of the base plate 4 in opposite directions by 90 degrees. (4) Then, bend the 60-degree bending angle of one end of the base plate 4 to 90 degrees, so that the two ends of the base plate 4 are butt jointed, and finally form a square shell 5.

[0069] As can be seen, in the second bending step, one end is bent to a 60-degree angle instead of a 90-degree angle, mainly to prevent damage caused by collision between the two ends of the base plate 4 when the middle part is bent in the third step. Therefore, by adopting this bending process, on the one hand, it can realize regular and sequential bending forming, and on the other hand, it can also improve the bending safety to protect the bent base plate 4.

[0070] In this embodiment, in the 5) performance test step, the following method is adopted to test the pressure resistance of the welded high-pressure-resistant titanium or titanium alloy square box:

[0071] ① From the multiple high-pressure titanium or titanium alloy square boxes manufactured using the method for manufacturing a high-pressure titanium or titanium alloy square box according to Example 2, three high-pressure titanium or titanium alloy square boxes with the thickening treatment of the mouth 12 using Method 1 were selected as Experimental Example 1, three high-pressure titanium or titanium alloy square boxes with the thickening treatment of the mouth 12 using Method 2 were selected as Experimental Example 2, and three high-pressure titanium or titanium alloy square boxes with the thickening treatment of the mouth 12 using Method 3 were selected as Experimental Example 3. Three titanium or titanium alloy square boxes manufactured using the manufacturing sequence of 1) sheet material cutting and cleaning, 3) bending and forming, and 4) welding into a box according to Example 2 were then used as Comparative Example 1. The dimensions of the titanium or titanium alloy square boxes in Experimental Example 1, Experimental Example 2, Experimental Example 3, and Comparative Example 1 were all 110 mm × 20 mm × 100 mm, and the material of the square box body 1 was the same: TA1 pure titanium.

[0072] ② The titanium or titanium alloy square boxes of Experimental Example 1, Experimental Example 2, Experimental Example 3 and Comparative Example 1 were placed on a pressure testing machine one by one, and the weld seam of the mouth 12 of the titanium or titanium alloy square box was perpendicular to the horizontal plane. Then, a static pressure test was performed on the pressure testing machine. The pressure values ​​when the titanium or titanium alloy square box was deformed were observed and recorded, and a table was prepared (as shown in Table 1);

[0073] ③Finally, through the comparison of the pressure values ​​in Table 1, it can be seen that the pressure resistance of the titanium or titanium alloy square box after thickening treatment is greater than the pressure resistance of the titanium or titanium alloy square box without thickening treatment.

[0074] Table 1 Hipot test result record

[0075]

[0076] In this embodiment, in step 5) of the performance test, the process of using the airtightness test equipment to test the airtightness of the welded high-pressure resistant titanium or titanium alloy square box adopts the following method:

[0077] ① From the multiple high-pressure titanium or titanium alloy square boxes manufactured using the method for manufacturing a high-pressure titanium or titanium alloy square box according to Example 2, ten high-pressure titanium or titanium alloy square boxes with the thickening treatment of the mouth 12 using Method 1 were selected as Experimental Example 4, ten high-pressure titanium or titanium alloy square boxes with the thickening treatment of the mouth 12 using Method 2 were selected as Experimental Example 5, and ten high-pressure titanium or titanium alloy square boxes with the thickening treatment of the mouth 12 using Method 3 were selected as Experimental Example 6. Then, ten titanium or titanium alloy square boxes manufactured using the manufacturing sequence of 1) sheet material cutting and cleaning, 3) bending and forming, and 4) welding into a box according to Example 2 were used as Comparative Example 2. The dimensions of the titanium or titanium alloy square boxes in Experimental Examples 1, 2, 3, and Comparative Example 2 were all 110 mm × 20 mm × 100 mm, and the material of the square box body 1 was the same: TA1 pure titanium.

[0078] ② The titanium or titanium alloy square boxes of Experimental Example 4, Experimental Example 5, Experimental Example 6, and Comparative Example 2 were completely immersed in water one by one and left to stand for 5 minutes; the water was observed to see whether there were continuous bubbles emerging. Continuous bubbles indicated that the titanium or titanium alloy square box had a leak, and the results were tabulated (as shown in Table 2);

[0079] ③ Finally, by comparing the number of boxes with leakage in Table 2, it can be seen that the airtightness of the titanium or titanium alloy square box after thickening treatment is stronger than that of the titanium or titanium alloy square box without thickening treatment.

[0080] Table 2 Airtightness test result record

[0081]

[0082] In summary, the core of the method for making a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer 3 of the present invention lies in the processes of thickening treatment, bending forming, and welding into a box; wherein the transition metal layer 3 is provided at the mouth 12 by thickening treatment, mainly by three methods: laser welding technology, laser cladding technology, and SLM metal 3D printing technology. These three methods have high processing accuracy and can perform high-precision positioning of the area to be thickened according to the positioning system of the equipment, and then achieve rapid prototyping by laser welding, laser cladding, and SLM metal 3D printing. Among them, the process methods of bending forming and welding into a box can enable the production process to be processed in a regular order, which is conducive to improving production efficiency.

[0083] The embodiments of the present invention are not limited to these. According to the above contents of the present invention, by utilizing common technical knowledge and customary means in this field, without departing from the above basic technical ideas of the present invention, the present invention can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the present invention.

Claims

1. A high-pressure resistant titanium or titanium alloy square box containing a transition metal layer, characterized in that: It comprises a square box body with a wall thickness of less than 0.5 mm; the top surface of the square box body is provided with two opening plates that can be bent relative to each other; the edges of the openings on both sides of the square box body are provided with a transition metal layer; the two opening plates are bent relative to each other so that a butt joint is formed between the two opening plates opposite to each other on the left and right; the butt joint is welded by a welding machine so that the transition metal layers on both sides of the square box body form an integrated structure to enhance the strength of the openings on both sides of the titanium or titanium alloy box.

2. The high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 1, characterized in that: The square box body includes a base plate and two cover plates; the transition metal layer is arranged on the edges of both sides of the base plate; the two ends of the base plate are bent to form the opening plate, and the middle part of the base plate is bent in opposite directions along two bending lines to form a square shell; the two cover plates are respectively welded to the openings on both sides of the square shell by a welding machine.

3. The high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 1, characterized in that: The square box body and the transition metal layer are made of different materials. The square box body is made of TA1 pure titanium or TC4 titanium alloy; the transition metal layer is made of TA1 pure titanium or TC4 titanium alloy.

4. The high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 2, characterized in that: The transition metal layer is a rectangular parallelepiped structure metal layer, and the two rectangular parallelepiped structure metal layers are respectively arranged on the edges of the opening on both sides of the square box body; Alternatively, the transition metal layer includes an integrally formed rectangular parallelepiped structured metal layer and a wedge-shaped metal layer, so that the transition metal layer becomes thinner from the edge of the mouth of the square box body toward the inside.

5. The high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 2, characterized in that: The size of the base plate is 100 mm×260 mm×0.2 mm, and the size of the transition metal layer is 4 mm×260 mm×0.2 mm.

6. A method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to any one of claims 2 to 5, characterized in that: The following steps are involved: 1) Sheet cutting: laser cutting the sheet according to size to form the base sheet; 2) Thickening treatment: The edges of both sides of the substrate are thickened to form the transition metal layer; 3) Bending: First, the two ends of the base plate are bent to form the opening plate, and then the two bending lines in the middle of the base plate are bent, and finally the openings at both ends of the base plate are butted together to form the square shell; 4) Welding into a box: The high-pressure resistant titanium or titanium alloy square box is formed by laser welding the corresponding positions at both ends of the base plate in the square shell and laser welding the cover plates at both sides of the square shell.

7. The method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 6, characterized in that: In the thickening step, the following method is adopted: The base plate is placed on the workbench of the laser welding machine, and the two cut transition metal layers are placed on the two side edges of the base plate. The designed tooling fixture is placed on both sides of the base plate. An argon gas input port and a laser heating port facing the transition metal layer are set on the tooling fixture. The argon gas input port supplies argon gas to the transition metal layer to create an inert protective environment. The laser heating port preheats the base plate and transition metal layer to be welded as a whole through laser heating. The laser welding machine positions the transition metal layers on both sides of the base plate, and uses laser oscillation welding to weld the transition metal layer and the base plate into one.

8. The method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 6, characterized in that: In the thickening step, the following method is adopted: The base plate is placed in the tooling to be clad of the laser cladding equipment, and the laser cladding equipment locates the areas to be laser clad on the edges of both sides of the base plate; the powder feeder of the laser cladding equipment feeds pure titanium powder or titanium alloy powder to the area to be laser clad, and the laser generator of the laser cladding equipment synchronously irradiates the generated laser beam to the area to be laser clad, so that the pure titanium powder or titanium alloy powder is clad by the laser beam to form the transition metal layer.

9. The method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 6, characterized in that: In the thickening step, the following method is adopted: The substrate plate is placed on the forming workbench of the SLM metal printer, and the SLM metal printer locates the areas to be printed on both sides of the substrate plate; the powder feeder of the SLM metal printer spreads a layer of pure titanium powder or titanium alloy powder on the area to be printed, and then the laser generator of the SLM metal printer performs laser scanning on the spread pure titanium powder or titanium alloy powder, thereby forming the transition metal layer by layer of powder spreading and laser scanning.

10. The method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 6, characterized in that: Before the plate cutting step, the plate needs to be heat-treated and shaped to remove stress; before the bending and forming step, the base plate that has undergone thickening treatment needs to be heat-treated and shaped to remove stress.

11. The method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 6, characterized in that: In the bending and forming step, the following method is adopted: first, bending lines are marked on both ends and the middle of the base plate; then, a V-groove mold is used to bend the base plate along the bending lines at both ends, so that the bending angle of one end of the base plate is 90 degrees and the bending angle of the other end is 60 degrees; then, the V-groove mold is used to bend the base plate 90 degrees in opposite directions along the two bending lines in the middle of the base plate; then, the bending angle of 60 degrees at one end of the base plate is bent to 90 degrees, so that the openings at both ends of the base plate are butted together; finally, a square shell is formed.

12. The method for manufacturing a high-pressure resistant titanium or titanium alloy square box containing a transition metal layer according to claim 6, wherein: Also includes: 5) Performance test: ① Use airtightness test equipment to test the airtightness of the welded high-pressure resistant titanium or titanium alloy square box; ② Use pressure-resistant equipment to test the pressure resistance of the welded high-pressure titanium or titanium alloy square box.

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