Method for processing titanium-aluminum composite

Abstract

The application provides a processing method of a titanium-aluminum composite material, the titanium-aluminum composite material comprising a titanium alloy layer and an aluminum alloy layer stacked with each other, and the processing method comprising: forming a processing hole in the titanium-aluminum composite material, the processing hole comprising a first hole and a second hole, the first hole extending into the titanium alloy layer from the aluminum alloy layer, and the second hole being located in the aluminum alloy layer, an end of the first hole away from the second hole being covered by a deformation part in the titanium alloy layer; processing the deformation part at a first feed speed; when a pushing force value starts to decrease after increasing, changing the first feed speed to a second feed speed; when the pushing force value decreases to a preset threshold value, changing the second feed speed to a third feed speed, the first feed speed being greater than the second feed speed and smaller than the third feed speed. The deformation part will extend along a drill bit when hot melting drilling, so that the titanium alloy covers a boundary between the titanium alloy layer and the aluminum alloy layer, and the material of the deformation part is more uniformly attached to a hole wall of the first hole, thereby improving the quality of drilling.

Description

Technical Field

[0001] This application relates to the field of thermal drilling, specifically a processing method for titanium-aluminum composite materials. Background Technology

[0002] Currently, in the manufacturing process of metal casings for electronic products (such as mobile phones or computers), it is necessary to machine hole structures (such as button holes, speaker holes, etc.) into the metal casing. When the metal casing is made of a double-layer metal composite material, such as titanium-aluminum alloy composite material, if ordinary cutting and drilling processes are used, the boundary between the titanium and aluminum alloys will be exposed on the inner wall of the hole. This can lead to problems such as cracking at the boundary between the titanium and aluminum alloys when the metal casing enters subsequent processes (such as corrosion processes), resulting in a reduction in the quality of the metal casing. Summary of the Invention

[0003] In view of this, it is necessary to provide a processing method for titanium-aluminum composite materials that can avoid exposing the titanium-aluminum alloy boundary on the inner wall of the hole.

[0004] One embodiment of this application provides a method for processing a titanium-aluminum composite material. The titanium-aluminum composite material includes stacked titanium alloy layers and aluminum alloy layers. The processing method includes: forming a processing hole in the titanium-aluminum composite material, the processing hole including a first hole and a second hole that are interconnected, the diameter of the first hole being larger than the diameter of the second hole, the first hole extending from the aluminum alloy layer into the titanium alloy layer, the second hole being located in the aluminum alloy layer, and the end of the first hole away from the second hole being covered by a deformed portion in the titanium alloy layer; performing hot-melt drilling from the side of the deformed portion away from the aluminum alloy layer toward the processing hole, with a first feed rate for the deformed portion. The process involves processing and monitoring the thrust value during the hot-melt drilling of titanium-aluminum composite materials. This allows the drill bit to penetrate the deformed part and cause the deformed part to protrude towards the machined hole. When the thrust value increases and then begins to decrease, the first feed speed is changed to the second feed speed to process the deformed part until the tip of the drill bit passes through the deformed part. When the thrust value decreases to a preset threshold, the second feed speed is changed to the third feed speed to process the deformed part, so that the material of the deformed part fills the space between the hole wall of the first hole and the drill bit. The first feed speed is greater than the second feed speed and less than the third feed speed.

[0005] In the processing method of the titanium-aluminum composite material provided in this application, the deformed portion extends along the drill bit during hot-melt drilling, allowing the titanium alloy to cover the boundary between the titanium alloy layer and the aluminum alloy layer, thereby avoiding exposure of the boundary. Furthermore, during drilling, when the thrust of the drill bit on the deformed portion increases and then decreases, the feed rate of the drill bit is reduced to increase the friction time between the drill bit and the deformed portion, maintaining the temperature and preventing uneven elongation due to temperature drop. When the drill bit exits the deformed portion, to prevent insufficient thrust from causing the deformed portion to fail to maintain its plastic deformation displacement, the feed rate is increased again, allowing the deformed portion to extend into place with the drill bit. This ensures that the material of the deformed portion more uniformly conforms to the hole wall of the first hole, thereby improving the drilling quality.

[0006] In some embodiments, the thickness of the deformed portion is 1.3 to 1.8 mm, the diameter of the main body of the drill bit is 1.4 to 1.9 mm, and the rotational speed of the drill bit is 1900 to 2500 revolutions per minute during hot melt drilling.

[0007] In some embodiments, the thickness of the deformed portion is 1.3 to 1.5 mm, the diameter of the main body of the drill bit is 1.4 to 1.6 mm, and the rotational speed of the drill bit for hot-melt drilling is 2300 to 2500 revolutions per minute.

[0008] In some embodiments, the first feed rate is 29 to 31 mm per minute, the second feed rate is 24 to 26 mm per minute, and the third feed rate is 39 to 41 mm per minute.

[0009] In some embodiments, before hot-melt drilling is performed on the side of the deformable portion away from the aluminum alloy layer toward the machining hole, a pre-sunk hole is formed on the side of the deformable portion away from the machining hole, and the pre-sunk hole is coaxially arranged with the machining hole.

[0010] In some embodiments, the processing method of the titanium-aluminum composite material further includes withdrawing the drill bit from the titanium-aluminum composite material at a fourth feed rate of 150 to 250 mm per minute.

[0011] In some embodiments, the first hole includes a bottom wall, a side wall, and an arc segment. The bottom wall is located in the deformed part, the side wall is connected between the bottom wall and the arc segment, and the arc segment is connected between the side wall and the second hole. After drilling is completed, the material of the deformed part fills the space between the side wall, the arc segment, and the drill bit, and the material of the deformed part fits with the side wall and the arc segment.

[0012] In some embodiments, monitoring the thrust value during the hot-melt drilling process of the titanium-aluminum composite material includes: positioning the titanium-aluminum composite material on a support fixture with a pressure sensor, and determining the thrust value during the hot-melt drilling process of the titanium-aluminum composite material based on the pressure sensed by the pressure sensor.

[0013] In some embodiments, the drill bit performs thermoforming on the deformed portion at a constant rotation speed, such that the rotation speed of the drill bit results in a material temperature of 850 to 900 degrees Celsius at the point where the thermoforming is performed.

[0014] In some embodiments, the diameter of the drill bit body is smaller than the diameter of the first hole, and the diameter of the first hole differs from the diameter of the drill bit body by 0.4 mm to 0.8 mm. Attached Figure Description

[0015] Figure 1 This is a flowchart of a processing method for titanium-aluminum composite materials in one embodiment of this application.

[0016] Figure 2 This is a cross-sectional view of a section before the start of a thermal drilling operation in one embodiment of this application.

[0017] Figure 3 for Figure 2 A cross-sectional diagram showing the initial stage of the thermal drilling process.

[0018] Figure 4 for Figure 2 A cross-sectional diagram showing the thermal fusion drill entering its intermediate stage.

[0019] Figure 5 for Figure 2 A cross-sectional diagram showing the thermal drilling process entering its later stages.

[0020] Figure 6 for Figure 2 A cross-sectional view after the hot melt drilling is completed.

[0021] Figure 7 This is a thrust curve of the drill bit on the deformed part during the hot melt drilling process in one embodiment of this application.

[0022] Figure 8 for Figure 6 A cross-sectional schematic diagram of the processing of titanium-aluminum composite materials after hot-melt drilling.

[0023] Explanation of main component symbols

[0024] Processing methods for titanium-aluminum composite materials 100

[0025] Titanium-aluminum composite material 200

[0026] Titanium alloy layer 201

[0027] Deformation section 2011

[0028] Aluminum alloy layer 202

[0029] Machining hole 203

[0030] First hole 2031

[0031] Bottom wall 2031a

[0032] Sidewall 2031b

[0033] Arc segment 2031c

[0034] Second hole 2032

[0035] Pre-sunk hole 204

[0036] 300 drill bit

[0037] Initial Stage A

[0038] Mid-term Phase B

[0039] Later stage C Detailed Implementation

[0040] The technical solution of this application will now be described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments.

[0041] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0042] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance. The term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components may exist in a state that is approximately perpendicular. For example, combined with numerical descriptions, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is straight or plane, the component can be considered a "straight line" or "plane."

[0043] 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 this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] 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.

[0045] Please see Figures 1 to 7 This application provides a processing method 100 (hereinafter referred to as processing method 100) for hot-melt drilling of a titanium-aluminum composite material 200. The titanium-aluminum composite material 200 includes a titanium alloy layer 201 and an aluminum alloy layer 202 stacked on top of each other. Processing method 100 includes:

[0046] S1: A machining hole 203 is formed in the titanium-aluminum composite material 200. The machining hole 203 includes a first hole 2031 and a second hole 2032 that are interconnected. The diameter of the first hole 2031 is larger than the diameter of the second hole 2032. The first hole 2031 extends from the aluminum alloy layer 202 into the titanium alloy layer 201, that is, the first hole 2031 penetrates the boundary between the titanium alloy layer 201 and the aluminum alloy layer 202. The second hole 2032 is located in the aluminum alloy layer 202 and penetrates the side of the aluminum alloy layer 202 away from the titanium alloy layer 201. The end of the first hole 2031 away from the second hole 2032 is covered by the deformed part 2011 in the titanium alloy layer 201.

[0047] S2: The drill bit 300 performs hot-melt drilling on the deformed part 2011 from the side away from the aluminum alloy layer 202 toward the machining hole 203, and processes the deformed part 2011 at the first feed rate, so that the drill bit 300 drills into the deformed part 2011 and causes the deformed part 2011 to protrude toward the machining hole 203. At the same time, the thrust value of the drill bit 300 on the titanium-aluminum composite material 100 during the hot-melt drilling process is monitored.

[0048] S3: When the thrust value increases to the maximum value and then begins to decrease, the first feed speed is changed to the second feed speed to process the deformation part 2011 until the top of the drill bit 300 passes through the deformation part 2011, wherein the second feed speed is less than the first feed speed.

[0049] S4: When the thrust value decreases to a preset threshold, the second feed speed is changed to the third feed speed to process the deformed part 2011, so that the material of the deformed part 2011 fills the hole wall of the first hole 2031 and the drill bit 300, wherein the third feed speed is greater than the first feed speed.

[0050] Understandably, the preset threshold can be set according to the needs of the actual thermal drilling process. Please refer to [link / reference]. Figure 7 The preset threshold can be the thrust value at which the thrust gradually decreases to an inflection point. Alternatively, it can be set based on actual processing requirements and experience. The value of the preset threshold needs to be adjusted according to the diameter of the drill bit's main body and the thickness of the deformed section.

[0051] During the steps S1 to S4 of the titanium-aluminum composite material 200, the deformed part 2011 extends along the drill bit 300 during hot-melt drilling. When the drill bit 300 passes through the first hole 2031 and enters the second hole 2032, the material of the deformed part 2011 fills the space between the hole wall of the first hole 2031 and the drill bit 300, so that the material of the deformed part 2011 covers the hole wall of the first hole 2031. That is, the titanium alloy covers the boundary between the titanium alloy layer 201 and the aluminum alloy layer 202, thereby avoiding the boundary being exposed in the first hole 2031 and preventing problems such as cracking of the titanium-aluminum composite material 200 at the boundary in subsequent processes.

[0052] In addition, during the hot melt drilling process, the drill bit 300 rotates while being fed. When the drill bit 300 applies a thrust to the deformed part 2011, an interaction force is generated between the drill bit 300 and the deformed part 2011. Therefore, friction is generated between the rotating drill bit 300 and the deformed part 2011. The friction generates frictional heat, which can raise the temperature of the deformed part 2011 to improve its fluidity. Under the combined action of frictional heat and thrust, the deformed part 2011 undergoes plastic deformation and displacement.

[0053] The temperature of the deformable part 2011 must be neither too high nor too low. If the temperature is too high, the deformable part 2011 will have excessive fluidity, causing it to flow directly downwards and unable to flow to the left or right, ultimately resulting in gaps or even breakage in the wall of the first hole 2031. If the temperature is too low, the deformable part 2011 will have insufficient fluidity and become cold-worked, ultimately resulting in scratches and stacking on the wall of the first hole 2031.

[0054] In step S2, the thermal drill is in the initial stage A, such as... Figure 2 , Figure 3 and Figure 7As shown, as the drill bit 300 gradually feeds, the thrust of the drill bit 300 on the deformed part 2011 gradually increases from zero, causing the interaction force between the drill bit 300 and the deformed part 2011 to also gradually increase from zero. Simultaneously, as the drill bit 300 penetrates deeper into the deformed part 2011, the contact area between the drill bit 300 and the deformed part 2011 gradually increases, resulting in increasing frictional heat. Therefore, at this stage, the feed rate of the drill bit 300 cannot be too low or too high. If the feed rate is too low, the friction time between the drill bit 300 and the deformed part 2011 will be too long, generating excessive frictional heat and causing the temperature of the deformed part 2011 to be too high. If the feed rate is too high, the friction time between the drill bit 300 and the deformed part 2011 will be too short, resulting in insufficient frictional heat and causing the temperature of the deformed part 2011 to be too low. Therefore, at this stage, the feed rate of the drill bit 300 is set to the first feed rate. When the drill bit 300 feeds at the first feed rate, the frictional heat and thrust generated by the drill bit 300 on the deformed part 2011 can both cause the deformed part 2011 to produce sufficient plastic deformation and displacement, and avoid excessive deformation of the deformed part 2011.

[0055] In step S3, the thermal drill is in intermediate stage B, such as... Figure 4 and Figure 7 As shown, as the plastic deformation and displacement of the deformed part 2011 gradually increase, the thrust of the drill bit 300 on the deformed part 2011 will begin to decrease after reaching its maximum value. At this time, the interaction force between the drill bit 300 and the deformed part 2011 begins to decrease, which in turn leads to a reduction in frictional heat. Therefore, the drill bit 300 reduces from the first feed speed to the second feed speed, making the drill bit 300 advance more slowly, thereby increasing the friction time between the drill bit 300 and the deformed part 2011 to maintain the temperature of the deformed part 2011, and thus making the deformed part 2011 maintain fluidity to deform more uniformly.

[0056] In step S4, the thermal drill is in the later stage C, such as... Figure 5 and Figure 7As shown, when the thrust value decreases to a preset threshold, the drill bit 300 passes through the deformation section 2011. At this time, if the feed rate remains at the second feed rate, the thrust of the drill bit 300 on the deformation section 2011 will gradually decrease from the preset threshold to zero, causing the interaction force between the drill bit 300 and the deformation section 2011 to gradually decrease to zero. Ultimately, the frictional heat will drop rapidly, causing the deformation section 2011 to be unable to maintain plastic deformation and displacement and to become a cold work. Therefore, in order to avoid cold working, when the thrust value decreases to the preset threshold, the drill bit 300 increases from the second feed speed to the third feed speed to increase the thrust of the drill bit 300 on the deformed part 2011, so that the thrust rises from the preset threshold, thereby increasing the interaction force between the drill bit 300 and the deformed part 2011, so as to generate sufficient frictional heat to push the deformed part 2011 into place, ensuring that the material of the deformed part 2011 fits more evenly against the hole wall of the first hole 2031, maintaining the smooth surface quality of the hole wall of the first hole 2031, thereby improving the drilling quality.

[0057] As can be seen, compared with the traditional hot melt drilling process that adopts a constant feed rate, the processing method 100 provided in this application changes the feed rate at each stage of hot melt drilling, so that the drill bit 300 always generates appropriate frictional heat and thrust on the deformed part 2011, ensuring that the material of the deformed part 2011 flows more evenly and fits the hole wall of the first hole 2031, and finally improves the surface quality of the hole wall of the first hole 2031 after drilling is completed.

[0058] In some embodiments, the drill bit 300 performs hot-melt drilling on the deformed portion 2011 at a constant rotational speed.

[0059] In some embodiments, the rotational speed of the drill bit 300 causes the material temperature of the titanium alloy at the point of thermal drilling to be between 850 degrees Celsius and 900 degrees Celsius, such as 850, 855, 860, 880, 885, 900 degrees Celsius, etc. The titanium alloy in this temperature range has better ductility so that the deformed part 2011 deforms more uniformly and fits the hole wall of the first hole 2031.

[0060] In some embodiments, the thickness of the deformed portion 2011 is 1.3 to 1.8 mm, such as 1.3, 1.35, 1.4, 1.6, 1.7, or 1.8 mm. The diameter of the main body of the drill bit 300 is 1.4 to 1.9 mm, such as 1.4, 1.45, 1.5, 1.7, or 1.9 mm. The diameter of the main body of the drill bit 300 needs to be slightly larger than the thickness of the deformed portion 2011 to be processed. During hot melt drilling, the rotational speed of the drill bit 300 is 1900 to 2500 revolutions per minute, such as 1900, 2000, 2100, 2250, 2300, or 2500 revolutions per minute.

[0061] In some embodiments, the thickness of the deformable portion 2011 is 1.3 to 1.5 mm, such as 1.3, 1.35, 1.4, 1.45, or 1.5 mm. The diameter of the main body of the drill bit 300 is 1.4 to 1.6 mm, such as 1.3, 1.35, 1.4, or 1.5 mm. During hot melt drilling, the rotational speed of the drill bit 300 is 2300 to 2500 revolutions per minute, such as 2300, 2350, 2400, 2450, or 2500 revolutions per minute.

[0062] In some embodiments, the first feed rate is 29 to 31 mm per minute, such as 29, 29.5, 30, 30.5, or 31 mm per minute. The second feed rate is 24 to 26 mm per minute, such as 24, 24.5, 25, 25.5, or 26 mm per minute. The third feed rate is 39 to 41 mm per minute, such as 39, 39.5, 40, 40.5, or 41 mm per minute.

[0063] As an exemplary example, based on numerous experiments, it has been found that when the thickness of the deformable part 2011 is 1.4 mm and the diameter of the main body of the drill bit 300 is 1.5 mm, setting the rotation speed of the drill bit 300 to 2400 rpm, the first feed rate to 30 mm / min, the second feed rate to 25 mm / min, and the third feed rate to 40 mm / min, the material of the deformable part 2011 can best fit the hole wall of the first hole 2031.

[0064] As an exemplary example, based on numerous experiments, it was found that when the thickness of the deformable part 2011 is 1.4 mm and the diameter of the main body of the drill bit 300 is 1.7 mm, setting the rotation speed of the drill bit 300 to 2000 rpm, the first feed rate to 30.5 mm per minute, the second feed rate to 26 mm per minute, and the third feed rate to 41 mm per minute, the material of the deformable part 2011 can best fit the hole wall of the first hole 2031.

[0065] In some embodiments, the diameter of the main body of the drill bit 300 is smaller than the diameter of the first hole 2031, and the diameter of the first hole 2031 differs from the diameter of the main body of the drill bit 300 by 0.4 mm to 0.8 mm, for example, by 0.4, 0.45, 0.5, 0.6, 0.7, or 0.8 mm. In this embodiment, the diameter of the first hole 2031 is the diameter of the end of the first hole 2031 closest to the deformed portion 2011.

[0066] In some embodiments, after the hot melt drilling is completed, the gap between the material of the deformed part 2011 and the hole wall of the first hole 2031 is less than 0.08 mm, for example, 0.01, 0.03, 0.06 or 0.08 mm.

[0067] In some embodiments, such as Figure 2 As shown, before hot-melt drilling is performed on the side of the deformed portion 2011 away from the aluminum alloy layer 202 towards the machining hole 203, a pre-sunk hole 204 is formed on the side of the deformed portion 2011 away from the machining hole 203. The pre-sunk hole 204 is coaxially arranged with the machining hole 203. The pre-sunk hole 204 is used to adjust the thickness of the deformed portion 2011; that is, by adjusting the depth of the pre-sunk hole 204, the thickness of the deformed portion 2011 is adjusted so that the thickness of the deformed portion 2011 meets the machining requirements. In addition, the pre-sunk hole 204 also serves as a pre-positioning function, so that the drill bit 300 is aligned with the machining hole 203 before machining.

[0068] In some embodiments, such as Figure 6 As shown, the processing method 100 further includes S5: the drill bit 300 is withdrawn from the titanium-aluminum composite material 200 at a fourth feed rate, the magnitude of which is greater than that of the third feed rate, so that the drill bit 300 is quickly withdrawn from the first hole 2031, avoiding material from the deformed part 2011 adhering to the drill bit 300, thereby ensuring the forming quality of the hole wall of the first hole 2031. The directions of the first feed rate and the second feed rate are opposite to those of the third feed rate. Further optionally, the fourth feed rate is 150 to 250 mm per minute, such as 150, 180, 200, 205, 230, 245 or 250 mm per minute.

[0069] In some embodiments, such as Figure 2 As shown, the hole wall of the first hole 2031 includes a bottom wall 2031a, a side wall 2031b, and an arc segment 2031c. The bottom wall 2031a is located on one side of the deformed part 2011. The side wall 2031b is connected between the bottom wall 2031a and the arc segment 2031c. The arc segment 2031c is connected between the side wall 2031b and the second hole 2032. The arc segment 2031c makes the side wall 2031b and the second hole 2032 form a rounded corner. After drilling is completed, the material of the deformed part 2011 fills the space between the side wall 2031b, the arc segment 2031c and the drill bit 300. The material of the deformed part 2011 fits into the side wall 2031b and the arc segment 2031c. The arc segment 2031c can support the material of the deformed part 2011 and prevent material loss. The rounded corners make it easier for the material of the deformed part 2011 to fill the space between the arc segment 2031c and the drill bit 300, so that the material of the deformed part 2011 fits the arc segment 2031c better and avoids gaps between the material of the deformed part 2011 and the arc segment 2031c.

[0070] In some embodiments, in step S2, monitoring the thrust value during the hot-melt drilling process of the titanium-aluminum composite material 200 includes: positioning the titanium-aluminum composite material 200 on a support fixture having a pressure sensor, and determining the thrust value experienced by the titanium-aluminum composite material 200 during the hot-melt drilling process based on the pressure sensed by the pressure sensor.

[0071] In some embodiments, such as Figure 8 As shown, since the second hole 2032 mainly serves as a clearance drill bit 300 during processing, after the hot-melt drilling is completed, there will still be a boundary between the titanium alloy and the aluminum alloy between the second hole 2032 and the first hole 2031. Therefore, the processing method 100 also includes S6: in the titanium-aluminum composite material 200 after hot-melt drilling, the side of the aluminum alloy layer 202 away from the titanium alloy layer 201 is processed to reduce the thickness of the aluminum alloy layer 202, so that the processed hole 203 retains only the first hole 2031, and the hole wall of the processed hole 203 is completely covered by titanium alloy, so that the hole wall of the processed hole 203 does not expose the boundary between the aluminum alloy layer 202 and the titanium alloy layer 201. As an exemplary example, the processing of the aluminum alloy layer 202 can be milling, grinding, etc.

[0072] In some embodiments, such as Figure 8 As shown, step S6 further includes: machining the side of the titanium alloy layer 201 away from the aluminum alloy layer 202 to make the side of the titanium alloy layer 201 away from the aluminum alloy layer 202 smoother and prevent burrs from appearing at the edge of the machining hole 203. As an example, the machining of the titanium alloy layer 201 can be milling, grinding, polishing, etc.

[0073] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A processing method for titanium-aluminum composite materials, characterized in that, The titanium-aluminum composite material comprises mutually stacked titanium alloy layers and aluminum alloy layers, and the processing method includes: A machining hole is formed in the titanium-aluminum composite material. The machining hole includes a first hole and a second hole that are interconnected. The diameter of the first hole is larger than the diameter of the second hole. The first hole extends from the aluminum alloy layer into the titanium alloy layer. The second hole is located in the aluminum alloy layer. The end of the first hole away from the second hole is covered by a deformed portion in the titanium alloy layer. Hot-melt drilling is performed from the side of the deformed part away from the aluminum alloy layer toward the processing hole. The deformed part is processed at a first feed rate, and the thrust value during the hot-melt drilling process of the titanium-aluminum composite material is monitored, so that the drill bit drills into the deformed part and the deformed part protrudes toward the processing hole. When the thrust value increases and then begins to decrease, the first feed rate is changed to the second feed rate to process the deformed part until the tip of the drill bit passes through the deformed part; When the thrust value decreases to a preset threshold, the second feed speed is changed to a third feed speed to process the deformed part, so that the material of the deformed part fills the space between the hole wall of the first hole and the drill bit, wherein the first feed speed is greater than the second feed speed and less than the third feed speed.

2. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, The thickness of the deformed part is 1.3 to 1.8 mm, the diameter of the main body of the drill bit is 1.4 to 1.9 mm, and the rotation speed of the drill bit is 1900 to 2500 revolutions per minute during hot melt drilling.

3. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, The thickness of the deformed part is 1.3 to 1.5 mm, the diameter of the main body of the drill bit is 1.4 to 1.6 mm, and the rotation speed of the drill bit for hot-melt drilling is 2300 to 2500 revolutions per minute.

4. The processing method of the titanium-aluminum composite material as described in claim 2 or 3, characterized in that, The first feed rate is 29 to 31 mm per minute, the second feed rate is 24 to 26 mm per minute, and the third feed rate is 39 to 41 mm per minute.

5. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, Before hot-melt drilling is performed from the side of the deformed portion away from the aluminum alloy layer toward the machining hole, a pre-sunk hole is formed on the side of the deformed portion away from the machining hole, and the pre-sunk hole is coaxially arranged with the machining hole.

6. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, It also includes the drill bit being withdrawn from the titanium-aluminum composite material at a fourth feed rate of 150 to 250 mm per minute.

7. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, The first hole includes a bottom wall, a side wall, and an arc segment. The bottom wall is located in the deformed part. The side wall is connected between the bottom wall and the arc segment. The arc segment is connected between the side wall and the second hole. After drilling is completed, the material of the deformed part fills the space between the side wall, the arc segment, and the drill bit. The material of the deformed part fits into the side wall and the arc segment.

8. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, The monitoring of the thrust value during the hot-melt drilling process of the titanium-aluminum composite material includes: positioning the titanium-aluminum composite material on a support fixture with a pressure sensor, and determining the thrust value during the hot-melt drilling process of the titanium-aluminum composite material based on the pressure sensed by the pressure sensor.

9. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, The drill bit performs thermoforming on the deformed part at a constant rotation speed, and the rotation speed of the drill bit makes the temperature of the titanium alloy material at the thermoforming part between 850 degrees Celsius and 900 degrees Celsius.

10. The processing method of the titanium-aluminum composite material as described in claim 1, characterized in that, The diameter of the main body of the drill bit is smaller than the diameter of the first hole, and the diameter of the first hole differs from the diameter of the main body of the drill bit by 0.4 mm to 0.8 mm.

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