Processing methods and structures of titanium-aluminum composite materials

Abstract

This application discloses a processing method and a titanium-aluminum composite structure. The processing method includes: forming a processing hole in an aluminum alloy layer, the processing hole including a first hole; forming a groove in a titanium alloy layer; forming an opening in the titanium alloy layer by hot-melt drilling, so that the titanium alloy layer is hot-melted to form a bushing, the bushing being located in the first hole and covering the hole wall of the first hole. This application utilizes the hot-melt drilling process to form a bushing with hot-melted titanium alloy, covering the hole wall of the first hole, that is, the titanium alloy material covers the aluminum alloy material. In subsequent chemical processing steps, the titanium alloy material is not easily corroded, thereby improving the sealing performance of the waterproof hole of the titanium-aluminum composite material.

Description

Technical Field

[0001] This application relates to the field of machining technology, and in particular to a processing method and a titanium-aluminum composite material structure. Background Technology

[0002] Currently, consumers have increasingly higher requirements for the waterproof function of mobile phones and other electronic products. In related technologies, waterproof vents are typically made of either titanium alloy or aluminum alloy. However, because the product requires subsequent chemical processing, aluminum alloy is more reactive than titanium alloy and is more susceptible to corrosion. This leads to a decrease in the smoothness of the waterproof vent's sidewalls and a reduction in its sealing performance. Summary of the Invention

[0003] In view of this, this application proposes a processing method and a titanium-aluminum composite structure to improve the sealing performance of the waterproof pores in the titanium-aluminum composite material.

[0004] One embodiment of this application provides a method for processing a titanium-aluminum composite material, the titanium-aluminum composite material comprising an aluminum alloy layer and a titanium alloy layer. The processing method includes the following steps:

[0005] Machined holes are formed on the aluminum alloy layer. The machined holes include a first hole and a second hole that are interconnected. Both the first hole and the second hole are circular holes, and the diameter of the first hole is larger than the diameter of the second hole. One end of the first hole is covered by the titanium alloy layer, and the other end of the first hole has a bottom wall. The first hole also has a side wall and an arc segment, and the arc segment connects the side wall and the bottom wall. The second hole is formed by a portion of the bottom wall being recessed in a direction away from the titanium alloy layer.

[0006] A groove is formed on the titanium alloy layer. The groove is formed by the surface of the titanium alloy layer facing away from the aluminum alloy layer and indenting towards the aluminum alloy layer. Along the thickness direction of the titanium alloy layer and the aluminum alloy layer, the distance between the bottom wall of the groove and the surface of the titanium alloy layer near the aluminum alloy layer is H1, where H1 ≥ 1.3 mm.

[0007] An opening is formed on the titanium alloy layer by hot-melt drilling, and a bushing is formed by hot-melt drilling of the titanium alloy layer between the groove and the first hole. The bushing is located in the first hole and covers the side wall and arc segment of the first hole. The first hole and the groove are connected through the opening. The opening is a circular hole with a diameter of 1.6 mm to 1.7 mm. Along the thickness direction of the titanium alloy layer and the aluminum alloy layer, the depth of the opening is greater than or equal to 1.3 mm.

[0008] In one embodiment, the height of the bushing along the thickness direction of the aluminum alloy layer and the titanium alloy layer is H2, where 1.0 mm ≤ H2 ≤ 1.4 mm.

[0009] In one embodiment, the diameter of the first hole is 2.07 mm to 2.27 mm.

[0010] In one embodiment, the depth of the first hole is 1.0 mm to 1.4 mm along the thickness direction of the aluminum alloy layer and the titanium alloy layer.

[0011] In one embodiment, the radius of the arc segment is 0.35mm to 0.45mm.

[0012] In one embodiment, the depth of the second hole is 0.7 mm to 0.9 mm along the thickness direction of the aluminum alloy layer and the titanium alloy layer.

[0013] In one embodiment, the machined hole further includes a third hole communicating with the second hole. The third hole is formed at the end of the second hole opposite to the first hole, and the third hole is a circular hole with a diameter larger than that of the second hole.

[0014] One embodiment of this application provides a titanium-aluminum composite structure, comprising an aluminum alloy layer and a titanium alloy layer. The titanium-aluminum composite structure has machined holes, openings, and a bushing. The machined holes are located in the aluminum alloy layer and include a first hole and a second hole that communicate with each other. Both the first hole and the second hole are circular holes, and the diameter of the first hole is larger than the diameter of the second hole. The first hole has a bottom wall, a side wall, and an arc segment, the arc segment connecting the side wall and the bottom wall. The second hole is formed by a portion of the bottom wall recessed away from the titanium alloy layer. The opening is located in the titanium alloy layer and communicates with the first hole. The bushing is formed of the titanium alloy layer and is located within the first hole, covering the side wall and the arc segment of the first hole.

[0015] In one embodiment, the titanium-aluminum composite structure is further provided with a groove, which is located on the side of the titanium alloy layer away from the aluminum alloy layer and communicates with the opening.

[0016] In one embodiment, the machined hole further includes a third hole communicating with the second hole. The third hole is formed at the end of the second hole opposite to the first hole, and the third hole is a circular hole with a diameter larger than that of the second hole.

[0017] This application utilizes a hot-melt drilling process to form a bushing (titanium alloy material) from hot-melt titanium alloy. This bushing completely covers the sidewalls and arc segments of the first hole (aluminum alloy material), meaning the titanium alloy material covers the aluminum alloy material. During subsequent chemical processing, the titanium alloy material is less susceptible to corrosion, thus improving the sealing performance of the waterproof hole in the titanium-aluminum composite material. Furthermore, the baffle structure formed by the bottom wall of the first hole and the second hole prevents the hot-melt titanium alloy from overflowing from the first hole, thereby preventing excessive stretching of the titanium alloy and subsequent cracking of the bushing. Additionally, the arc segment of the first hole closely resembles the rounded corners formed by the natural flow of the hot-melt titanium alloy, allowing the bushing to better fit and cover the sidewalls and arc segments of the first hole, further enhancing the sealing performance of the waterproof hole in the titanium-aluminum composite material. Attached Figure Description

[0018] Figure 1 A flowchart illustrating a processing method for a titanium-aluminum composite material provided in one embodiment of this application.

[0019] Figure 2 This is a cross-sectional view of a machined hole formed on an aluminum alloy layer of a titanium-aluminum composite material, provided for one embodiment of this application.

[0020] Figure 3 In order to be in Figure 2 The cross-sectional view shown shows a groove formed on the titanium alloy layer of the titanium-aluminum composite material.

[0021] Figure 4 In order to be in Figure 3 The diagram shows a cross-sectional view of a titanium-aluminum composite material through which a hot-melt hole was drilled.

[0022] Figure 5 To be Figure 4 The diagram shows a cross-sectional view of the titanium-aluminum composite structure formed after the drill bit was removed.

[0023] Figure 6 This is a photograph of the titanium-aluminum composite structure prepared in Example 1 of this application.

[0024] Figure 7 This is a photograph of the titanium-aluminum composite structure prepared in Example 2 of this application.

[0025] Figure 8 This is a photograph of the titanium-aluminum composite structure prepared in Example 3 of this application.

[0026] Figure 9 This is a cross-sectional view of the titanium-aluminum composite structure prepared in Comparative Example 1 of this application.

[0027] Figure 10 This is a photograph of the titanium-aluminum composite structure prepared in Comparative Example 1 of this application.

[0028] Figure 11 This is a cross-sectional view of the titanium-aluminum composite structure prepared in Comparative Example 2 of this application.

[0029] Figure 12 This is a photograph of the titanium-aluminum composite structure prepared in Comparative Example 2 of this application.

[0030] Explanation of main component symbols

[0031] Titanium-aluminum composite structure 100

[0032] Aluminum alloy layer 10

[0033] Titanium alloy layer 20

[0034] Machining hole 11

[0035] First hole 111

[0036] Second hole 112

[0037] Third hole 113

[0038] Bottom wall 1111

[0039] Side wall 1112

[0040] Arc segment 1113

[0041] Groove 21

[0042] 22 openings

[0043] Bushing 23

[0044] 200 drill bits

[0045] thickness direction z

[0046] Extension direction x

[0047] The following detailed description, in conjunction with the accompanying drawings, further illustrates the embodiments of this application. Detailed Implementation

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of this application belong. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] Embodiments of this application are described herein with reference to cross-sectional views, which are schematic diagrams of idealized embodiments (and intermediate configurations) of this application. Therefore, variations in the shapes illustrated due to manufacturing processes and / or tolerances are foreseeable. Consequently, embodiments of this application should not be construed as limited to the specific shapes of the areas illustrated herein, but should include, for example, deviations in shape due to manufacturing processes. The areas shown in the figures are merely illustrative, and their shapes are not intended to represent the actual shapes of the illustrated devices, nor are they intended to limit the scope of this application.

[0051] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] Please see Figure 1 This application provides a processing method for titanium-aluminum composite materials, comprising steps S10 to S30. It is understood that the numbering of the steps is intended to clearly describe the specific processing method and is not a limitation on the order of the steps. For example, the order of steps S10 and S20 can be interchanged, i.e., step S20 can be performed first, followed by step S10. The titanium-aluminum composite material includes an aluminum alloy layer 10 and a titanium alloy layer 20. The grades of the titanium alloy and aluminum alloy can be conventional or unconventional in the art, and this application does not impose any restrictions.

[0053] Please see Figure 2 In step S10, a machining hole 11 can be formed on the aluminum alloy layer 10 by means of, but not limited to, mechanical drilling. The machining hole 11 includes a first hole 111 and a second hole 112 that are interconnected, with the first hole 111 being closer to the titanium alloy layer 20 than the second hole 112. Both the first hole 111 and the second hole 112 are circular holes, with the diameter of the first hole 111 being larger than the diameter of the second hole 112. One end of the first hole 111 is covered by the titanium alloy layer 20, that is, Figure 2 In the design, the top wall of the first hole 111 is a titanium alloy layer 20. The other end of the first hole 111 has a bottom wall 1111, and the second hole 112 is formed by a portion of the bottom wall 1111 recessed away from the titanium alloy layer 20. The first hole 111 also has a side wall 1112 and an arc segment 1113. One end of the side wall 1112 is connected to the titanium alloy layer 20, and the other end is connected to the arc segment 1113. The arc segment 1113 connects the side wall 1112 and the bottom wall 1111.

[0054] Since the diameter of the first hole 111 is larger than that of the second hole 112, the bottom wall 1111 of the first hole 111 and the second hole 112 can form a stepped retaining structure. In the subsequent hot-melt drilling step, this retaining structure prevents the hot-melt titanium alloy from overflowing from the first hole 111, thereby preventing the titanium alloy from being stretched too long and causing the formation of the bushing 23 (see...). Figure 4) Cracks. The arc segment 1113 of the first hole 111 is close to the rounded corner formed by the natural flow of the hot-melted titanium alloy, thus enabling the formed bushing 23 (refer to) to crack. Figure 4 It better fits and covers the sidewall 1112 and arc segment 1113 of the first hole 111.

[0055] In some embodiments, the diameter D1 of the first hole 111 ranges from 2.07 mm to 2.27 mm. For example, the diameter D1 of the first hole 111 can be 2.07 mm, 2.17 mm, 2.27 mm, etc., which will not be elaborated here. In other embodiments, the diameter of the first hole 111 can also be adjusted to other values ​​to meet the requirements of the product's waterproof hole.

[0056] In some embodiments, the depth of the first hole 111 along the thickness direction z of the aluminum alloy layer 10 and the titanium alloy layer 20 is 1.0 mm to 1.4 mm. For example, the depth of the first hole 111 can be 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, etc., which will not be elaborated here. With the depth of the first hole 111 within the above range, the subsequently formed bushing 23 (see...) Figure 4 This will completely cover the side wall 1112 and the arc segment 1113 of the first hole 111.

[0057] In some embodiments, the depth of the second hole 112 is 0.7 mm to 0.9 mm along the thickness direction z of the aluminum alloy layer 10 and the titanium alloy layer 20. For example, the depth of the second hole 112 can be 0.7 mm, 0.8 mm, 0.9 mm, etc., which will not be elaborated here. The depth of the second hole 112 within the above range ensures that the molten titanium alloy does not overflow downwards and facilitates processing. The diameter of the second hole 112 can be adjusted according to product requirements, as long as it is smaller than the diameter of the first hole 111. It can be understood that the depth direction of the second hole 112 is also the thickness direction z of the aluminum alloy layer 10 and the titanium alloy layer 20.

[0058] In some embodiments, the radius of the arc segment 1113 is 0.35mm to 0.45mm. For example, the radius of the arc segment 1113 can be 0.35mm, 0.40mm, 0.45mm, etc., which will not be elaborated here. When the radius of the arc segment 1113 is within the above range, it can be ensured that the rounded corners formed by the natural flow of the hot-melted titanium alloy fit well with the arc segment 1113, so as to avoid the bushing 23 (see reference) formed by the hot-melt process. Figure 4 There is a gap between the hole and the inner surface of the first hole 111.

[0059] like Figure 2As shown, in some embodiments, the machined hole 11 further includes a third hole 113 communicating with the second hole 112. The third hole 113 is formed at the end of the second hole 112 opposite to the first hole 111. The third hole 113 is a circular hole, and its diameter is larger than that of the second hole 112 and larger than that of the first hole 111. The third hole 113, the second hole 112, and the first hole 111 can be coaxially arranged. During hot-melt drilling, the drill bit 200 feeds from the titanium alloy layer 20 side toward the aluminum alloy layer 10. The third hole 113 is used to accommodate the hot-melt drill bit in the hot-melt step to prevent the hot-melt drill bit from melting the aluminum alloy layer 10.

[0060] In some embodiments, the third hole 113 may be omitted. In this case, the depth of the second hole 112 may be appropriately extended to accommodate the thermoplastic drill bit, so as to prevent the thermoplastic drill bit from melting the aluminum alloy layer 10.

[0061] Please see Figure 3 In step S20, a groove 21 can be formed on the titanium alloy layer 20 by means of milling, but not limited to milling. The groove 21 is formed by the surface of the titanium alloy layer 20 facing away from the aluminum alloy layer 10 and indenting towards the aluminum alloy layer 10. The groove 21 is set approximately corresponding to the first hole 111, and the cross-sectional shape of the groove 21 can be trapezoidal. Along the thickness direction z of the titanium alloy layer 20 and the aluminum alloy layer 10, the distance between the bottom of the groove 21 and the surface of the titanium alloy layer 20 near the aluminum alloy layer 10 is H1, where H1 ≥ 1.3 mm. In the subsequent hot-melt drilling step, the titanium alloy layer 20 between the groove 21 and the first hole 111 is hot-melted to form a bushing 23 (see reference). Figure 4 The groove 21 can be used to install buttons for electronic products.

[0062] In some embodiments, the length of the bottom of the groove 21 along the extending direction x of the aluminum alloy layer 10 and the titanium alloy layer 20 may be greater than the diameter of the first hole 111. For example, the length of the bottom of the groove 21 may be 2.20 mm, and the diameter of the first hole 111 may be 2.17 mm. The extending direction x may be the length direction of the aluminum alloy layer 10 and the titanium alloy layer 20, or it may be the width direction of the aluminum alloy layer 10 and the titanium alloy layer 20.

[0063] Please see Figure 4 and Figure 5In step S30, an opening 22 is formed in the titanium alloy layer 20 by hot-melt drilling. The titanium alloy layer 20 located between the groove 21 and the first hole 111 is hot-melted to form a bushing 23. The bushing 23 is located within the first hole 111 and covers the sidewall 1112 and the arc segment 1113 of the first hole 111, resulting in a titanium-aluminum composite structure 100. One end of the opening 22 communicates with the groove 21, and the other end communicates with the first hole 111; that is, the first hole 111 and the groove 21 are connected through the opening 22. The opening 22 is a circular hole with a diameter D2 of 1.6 mm to 1.7 mm. Along the thickness direction z of the titanium alloy layer 20 and the aluminum alloy layer 10, the depth of the opening 22 is greater than or equal to 1.3 mm. The depth of the opening 22 is also the distance H1 between the bottom of the groove 21 and the surface of the titanium alloy layer 20 near the aluminum alloy layer 10.

[0064] The working process of using drill bit 200 for hot-melt drilling is as follows: First, the shank (not shown) of drill bit 200 is clamped on the spindle (not shown) of a drilling machine (not shown) or other workpiece, driving drill bit 200 to rotate at high speed, and drill bit 200 will feed axially. When drill bit 200 contacts titanium alloy layer 20 through groove 21, the frictional heat generated by high-speed rotation causes the titanium alloy layer 20 at the contact area to heat up rapidly and melt, and the area of ​​titanium alloy layer 20 in the hot-melt state gradually expands. As drill bit 200 feeds downward, the molten titanium alloy flows downward and extends, forming bushing 23 on the first hole 111. Bushing 23 is roughly a hollow cylindrical shape and is arranged around the first hole 111.

[0065] In this embodiment, the drill bit 200 rotates at 2000 rpm and feeds axially at 20 mm / min. During the hot-melt drilling process, the drill bit 200 needs to be cooled by blowing air; cutting fluid cannot be used. After machining one hole 22, a 3-second pause is required to cool the drill bit 200 and prevent it from overheating.

[0066] In the waterproof hole of the titanium-aluminum composite material, the hole located in the aluminum alloy material (i.e., the first hole 111) has a diameter of approximately 2.17 mm and a depth of approximately 1.2 mm. According to UG simulation, the volume of the bushing 23 covering the hole wall surrounding the aluminum alloy hole (i.e., the first hole 111) is 2.2613 mm². 3 Theoretically, the volume of opening 22 can be considered as the volume of the hot-melted titanium alloy, and the volume of the hot-melted titanium alloy can be considered as the volume of bushing 23. When the diameter D2 and depth H1 of opening 22 meet the above conditions, the volume of bushing 23 formed by the hot-melted titanium alloy is greater than the volume simulated in UG by 2.2613 mm. 3 The bushing 23 can then completely cover the side wall 1112 and the arc segment 1113 of the first hole 111.

[0067] In some embodiments, the drill bit 200 includes multiple arcs. When the drill bit is subjected to force, the arcs can distribute the torque force upwards, extending the force point upwards to the shank area, thereby enhancing the torque resistance of the drill bit 200 and increasing its lifespan.

[0068] Please see Figure 5 The second aspect of this application provides a titanium-aluminum composite structure 100 manufactured by the above-described processing method. The titanium-aluminum composite structure 100 includes an aluminum alloy layer 10 and a titanium alloy layer 20, and the titanium-aluminum composite structure 100 is provided with a processing hole 11, a bushing 23, and an opening 22.

[0069] A machined hole 11 is located in the aluminum alloy layer 10 and includes a first hole 111 and a second hole 112 that are interconnected. Both the first hole 111 and the second hole 112 are circular holes, with the diameter of the first hole 111 being larger than that of the second hole 112. The first hole 111 has a bottom wall 1111, a side wall 1112, and an arc segment 1113, which connects the side wall 1112 and the bottom wall 1111. The second hole 112 is formed by a portion of the bottom wall 1111 recessed away from the titanium alloy layer 20. A bushing 23 is formed in the titanium alloy layer 20 and is located within the first hole 111, covering the side wall 1112 and the arc segment 1113 of the first hole 111. An opening 22 is located in the titanium alloy layer 20 and communicates with the first hole 111.

[0070] In some embodiments, such as Figure 5 As shown, the titanium-aluminum composite structure 100 also includes a groove 21. The groove 21 is located on the side of the titanium alloy layer 20 away from the aluminum alloy layer 10 and communicates with the opening 22.

[0071] In some embodiments, such as Figure 5 As shown, the machining hole 11 also includes a third hole 113 that communicates with the second hole 112. The third hole 113 is formed at the end of the second hole 112 that is away from the first hole 111. The third hole 113 is a circular hole, and the diameter of the third hole 113 is larger than the diameter of the second hole 112.

[0072] The present application will be further described below with reference to specific embodiments and comparative examples.

[0073] Example 1

[0074] In step S10, as Figure 2 As shown, machining holes 11 can be formed on the aluminum alloy layer 10 by mechanical drilling. The machining holes 11 include a first hole 111, a second hole 112, and a third hole 113 that are interconnected. The diameter D1 of the first hole 111 is 2.17 mm, and the radius of the arc segment 1113 is 0.4 mm. The depth of the second hole 112 is 0.8 mm.

[0075] In step S20, such as Figure 3As shown, a groove 21 can be formed on the titanium alloy layer 20 by milling. The distance H1 between the bottom of the groove 21 and the surface of the titanium alloy layer 20 near the aluminum alloy layer 10 is 1.3 mm.

[0076] In step S30, such as Figure 5 As shown, an opening 22 is formed in the titanium alloy layer 20 by hot-melt drilling. The diameter D2 of the opening 22 is 1.5 mm, and the depth (i.e., H1) is 1.3 mm. Along the thickness direction z of the titanium alloy layer 20 and the aluminum alloy layer 10, the height H2 of the bushing 23 is 1.0 mm.

[0077] like Figure 6 As shown, the rounded corners formed by the natural flow of the hot-melted titanium alloy closely match the arc segment 1113 of the first hole 111. In this embodiment, the volume of the opening 22 is 2.2973 mm. 3 (π×(1.5 / 2) 2 ×1.3), which is larger than the volume of 2.2613mm simulated in UG. 3 Therefore, the bushing 23 can completely and evenly cover the hole wall (side wall 1112 and arc segment 1113) of the first hole 111, with no gap between the bushing 23 and the hole wall of the first hole 111. However, for the waterproof hole design of some electronic products, a bushing height of 1.0 mm may be too small.

[0078] Example 2

[0079] The difference between this embodiment and Embodiment 1 is that in step S20, H1 is 1.5mm; in step S30, the depth of the opening 22 is 1.5mm, and the height H2 of the bushing 23 is 1.2mm. The rest is the same as in Embodiment 1, and will not be repeated here.

[0080] like Figure 7 As shown, the rounded corners formed by the natural flow of the hot-melted titanium alloy fit closely to the arc segment 1113 of the first hole 111. The bushing 23 can completely and evenly cover the hole wall (side wall 1112 and arc segment 1113) of the first hole 111, and there is no gap between the bushing 23 and the hole wall of the first hole 111.

[0081] Example 3

[0082] The difference between this embodiment and Embodiment 1 is that in step S20, H1 is 1.5mm; in step S30, the depth of the opening 22 is 1.5mm, and the height H2 of the bushing 23 is 1.4mm. The rest is the same as in Embodiment 1, and will not be repeated here.

[0083] like Figure 8As shown, the rounded corners formed by the natural flow of the hot-melted titanium alloy fit closely to the arc segment 1113 of the first hole 111. The bushing 23 can completely and evenly cover the hole wall (side wall 1112 and arc segment 1113) of the first hole 111, and there is no gap between the bushing 23 and the hole wall of the first hole 111.

[0084] Comparative Example 1

[0085] like Figure 9 As shown, the difference between Comparative Example 1 and Example 3 is that the hole 11 processed in step S10 includes a first hole 111 and a third hole 113 that are connected. The first hole 111 does not have an arc segment 1113 and a bottom wall 1111, and cannot form a material-blocking structure with the third hole 113. The rest is the same as in Example 3, and will not be described again here.

[0086] like Figure 10 As shown, due to the lack of a baffle structure, the hot-melted titanium alloy was stretched too long, causing cracks, which resulted in cracks on the bushing 23 and affected the airtightness of the hole.

[0087] Comparative Example 2

[0088] like Figure 11 As shown, the difference between Comparative Example 1 and Example 3 is that in step S10, the bottom wall 1111 and the side wall 1112 of the first hole 111 are connected at a right angle and do not have an arc segment 1113. The rest is the same as in Example 3, and will not be described again here.

[0089] like Figure 12 As shown, the right-angle connection area between the bottom wall 1111 and the side wall 1112 of the first hole 111 is deformed by the hot-melted titanium alloy, forming an R-angle. The resistance of the hot-melted titanium alloy causes a gap to be generated between the bushing 23 and the side wall of the first hole 111, affecting the airtightness of the hole.

[0090] The parameters in the above embodiments and comparative examples are shown in Table 1.

[0091] Table 1

[0092]

[0093] As can be seen from the above embodiments and comparative examples, the baffle structure formed by the bottom wall 1111 of the first hole 111 and the second hole 112 in this application can prevent the hot-melt titanium alloy from overflowing from the first hole 111, thereby preventing the titanium alloy from being stretched too long and causing the formed bushing 23 to crack. Furthermore, the arc segment 1113 of the first hole 111 is quite close to the rounded corner formed by the natural flow of the hot-melt titanium alloy, thus allowing the formed bushing 23 to better fit and cover the side wall 1112 and the arc segment 1113 of the first hole 111, thereby improving the sealing performance of the hole.

[0094] In this application, the diameter of the opening 22 is 1.6mm to 1.7mm, and the depth of the opening 22 is greater than or equal to 1.3mm. Thus, the volume of the bushing 23 formed by the hot-melted titanium alloy is greater than the volume simulated in UG. The bushing 23 (titanium alloy material) can completely cover the sidewall 1112 and the arc segment 1113 of the first hole 111 (aluminum alloy material). That is, the titanium alloy material covers the aluminum alloy material. In the subsequent chemical processing steps, the titanium alloy material is not easily corroded, thereby improving the sealing performance of the waterproof hole.

[0095] The above description describes some specific embodiments of this application, but in actual applications, the application should not be limited to these embodiments. For those skilled in the art, other modifications and alterations made based on the technical concept of this application should fall within the protection scope of this application.

Claims

1. A method for processing a titanium-aluminum composite material, wherein the titanium-aluminum composite material comprises an aluminum alloy layer and a titanium alloy layer, characterized in that, The processing method includes the following steps: Machined holes are formed on the aluminum alloy layer. The machined holes include a first hole and a second hole that are interconnected. Both the first hole and the second hole are circular holes, and the diameter of the first hole is larger than the diameter of the second hole. One end of the first hole is covered by the titanium alloy layer, and the other end of the first hole has a bottom wall. The first hole also has a side wall and an arc segment, and the arc segment connects the side wall and the bottom wall. The second hole is formed by a portion of the bottom wall being recessed in a direction away from the titanium alloy layer. A groove is formed on the titanium alloy layer. The groove is formed by the surface of the titanium alloy layer facing away from the aluminum alloy layer and indenting towards the aluminum alloy layer. Along the thickness direction of the titanium alloy layer and the aluminum alloy layer, the distance between the bottom wall of the groove and the surface of the titanium alloy layer near the aluminum alloy layer is H1, where H1 ≥ 1.3 mm. An opening is formed on the titanium alloy layer by hot-melt drilling, and a bushing is formed by hot-melt drilling of the titanium alloy layer between the groove and the first hole. The bushing is located in the first hole and covers the side wall and arc segment of the first hole. The first hole and the groove are connected through the opening. The opening is a circular hole with a diameter of 1.6 mm to 1.7 mm. Along the thickness direction of the titanium alloy layer and the aluminum alloy layer, the depth of the opening is greater than or equal to 1.3 mm.

2. The processing method as described in claim 1, characterized in that, Along the thickness direction of the aluminum alloy layer and the titanium alloy layer, the height of the bushing is H2, where 1.0mm≤H2≤1.4mm.

3. The processing method as described in claim 1, characterized in that, The diameter of the first hole is 2.07 mm to 2.27 mm.

4. The processing method as described in claim 1, characterized in that, Along the thickness direction of the aluminum alloy layer and the titanium alloy layer, the depth of the first hole is 1.0 mm to 1.4 mm.

5. The processing method as described in claim 1, characterized in that, The radius of the arc segment is 0.35mm to 0.45mm.

6. The processing method as described in claim 1, characterized in that, Along the thickness direction of the aluminum alloy layer and the titanium alloy layer, the depth of the second hole is 0.7 mm to 0.9 mm.

7. The processing method as described in claim 1, characterized in that, The machining hole also includes a third hole communicating with the second hole. The third hole is formed at the end of the second hole away from the first hole. The third hole is a circular hole, and the diameter of the third hole is larger than the diameter of the second hole.

8. A titanium-aluminum composite structure, wherein the titanium-aluminum composite structure comprises an aluminum alloy layer and a titanium alloy layer, characterized in that, The titanium-aluminum composite structure is provided with: The machined holes are located in the aluminum alloy layer. The machined holes include a first hole and a second hole that are interconnected. Both the first hole and the second hole are circular holes, and the diameter of the first hole is larger than the diameter of the second hole. The first hole has a bottom wall, a side wall, and an arc segment, and the arc segment connects the side wall and the bottom wall. The second hole is formed by a portion of the bottom wall being recessed in a direction away from the titanium alloy layer. An opening is located in the titanium alloy layer and communicates with the first hole; A bushing, formed of the titanium alloy layer, is located within the first hole and covers the sidewalls and arc segment of the first hole.

9. The titanium-aluminum composite structure as described in claim 8, characterized in that, The titanium-aluminum composite structure is also provided with a groove, which is located on the side of the titanium alloy layer away from the aluminum alloy layer and communicates with the opening.

10. The titanium-aluminum composite structure as described in claim 8, characterized in that, The machining hole also includes a third hole communicating with the second hole. The third hole is formed at the end of the second hole away from the first hole. The third hole is a circular hole, and the diameter of the third hole is larger than the diameter of the second hole.

Images