An ultrasonic-assisted titanium alloy continuous drilling method based on heat accumulation utilization

Abstract

The application discloses a kind of ultrasonic-assisted titanium alloy continuous drilling methods based on heat accumulation, belong to titanium alloy material drilling processing technical field, the present application is to solve the problem that existing titanium alloy material continuous drilling still needs larger drilling force.Calculate the heat transfer radius of workpiece, detect the heat-affected zone radius of workpiece, determine the drilling strategy according to the heat transfer radius and the heat-affected zone radius, when the drilling spacing is large, drill the hole to increase the heat accumulation, drill the hole after the heat accumulation increases, and dynamically adjust the processing strategy through the real-time temperature of the workpiece drilling area.Through the test, the ultrasonic vibration assisted drilling of the application actively manages heat is realized under different processing parameters Significant drilling force reduction, compared with the traditional ultrasonic-assisted drilling of strengthening heat dissipation, the highest reduction reaches 19.7%.It helps to reduce the wear of tool.

Description

Technical Field

[0001] This invention belongs to the field of drilling technology for titanium alloy materials, and particularly relates to an ultrasonic-assisted continuous drilling method for titanium alloys based on heat accumulation utilization. Background Technology

[0002] Titanium alloys, as typical difficult-to-machine materials, present numerous technical challenges in continuous drilling. In existing technologies, due to their poor thermal conductivity, cutting heat is difficult to dissipate effectively in the machining zone. This leads to a gradual accumulation of heat during continuous drilling, resulting in accelerated tool wear, decreased hole wall quality, and significantly increased burrs at the hole opening, affecting machining consistency and efficiency.

[0003] Currently, ultrasonic vibration-assisted drilling technology has been applied in some titanium alloy machining scenarios, including single-hole and continuous multi-hole machining. Existing technologies mainly improve the cutting force and promote chip removal by superimposing high-frequency vibrations during the drilling process. They often use high amplitudes and are frequently combined with external cooling methods to help reduce the machining temperature.

[0004] Although existing ultrasonic-assisted drilling technology has been applied to some extent in titanium alloy processing, the following main problems still exist:

[0005] First, heat accumulation during continuous drilling is unavoidable, and existing machining methods generally lack strategies for actively guiding and optimizing this heat accumulation process. Traditional methods often suppress the thermal effect by strengthening cooling, failing to fully leverage the potential positive impact of heat accumulation on improving the plasticity of titanium alloys.

[0006] Secondly, existing ultrasonic-assisted drilling technologies typically do not optimize the ultrasonic vibration parameters in conjunction with the thermal dynamic evolution characteristics during continuous multi-hole machining. They lack a coordinated control scheme for thermal state and vibration parameters, resulting in poor usability of heat accumulation during machining. Machining performance, such as hole wall quality and machining force, is easily affected by thermal fluctuations. While existing thermally assisted machining technologies (such as laser-assisted and induction-assisted machining) can reduce machining force through external heating, they are complex, costly, and difficult to integrate, making them unsuitable for the needs of conventional continuous drilling production.

[0007] Furthermore, the distribution of the heat-affected zone during continuous drilling is significantly affected by factors such as hole sequence design, local heat dissipation conditions, and drilling path. Existing technologies do not provide proactive optimization methods to manage this, which affects the machining quality and tool life during multi-hole machining.

[0008] Based on the above problems, this invention proposes an ultrasonic-assisted continuous drilling method for titanium alloys based on heat accumulation utilization. The aim is to actively control heat accumulation within a reasonable range by monitoring the temperature and adjusting the processing process, reasonably enhance and utilize the unavoidable thermal effects during processing, improve the local plasticity of titanium alloy materials, reduce processing force, improve hole wall quality, optimize the processing effect of specific hole sections, and improve the processing performance and process applicability of specific hole sections during continuous drilling. Summary of the Invention

[0009] The purpose of this invention is to provide an ultrasonic-assisted continuous drilling method for titanium alloys based on heat accumulation, to solve the problem that existing continuous drilling methods for titanium alloys still require a large drilling force due to the reliance on cooling for heat dissipation. The technical solution adopted by this invention is as follows:

[0010] An ultrasonic-assisted continuous drilling method for titanium alloys based on heat accumulation includes the following steps:

[0011] Step 1: Obtain the workpiece design drawing and hole location distribution diagram, and count the number of holes N to be drilled and the distance D between adjacent holes. s ;

[0012] Step 2: Calculate the heat transfer radius of the workpiece using the following formula. :

[0013] ;

[0014] In the formula: This refers to the localized thermal effect time, i.e., the drilling time for a single hole, expressed in minutes. Thermal diffusivity of the material, in meters (m). 2 / min, Calculated using the following formula:

[0015] ;

[0016] In the formula: The density of the workpiece material, in kg / m³ 3 , Thermal conductivity of the workpiece, in W / (m ℃), The specific heat of the workpiece material is expressed in J / kg·K.

[0017] Calculated using the following formula:

[0018] ;

[0019] In the formula, The thickness of the workpiece is expressed in mm. This represents the drilling feed rate, expressed in mm / min.

[0020] Step 3: Prepare a test specimen made of the same material as the workpiece, drill holes in the test specimen, and measure the radius of the heat-affected zone of the test specimen by microhardness testing. The test sample As a workpiece ;

[0021] Step 4: Based on the workpiece and Determine the drilling strategy to be adopted:

[0022] when ≤D s ≤2 At that time, directly drill the hole to be drilled;

[0023] When 2 <D s ≤4 First, drill two process holes on the line connecting the two holes to be drilled, so that the two process holes divide the line connecting the two holes to be drilled into three equal parts, and then drill the holes to be drilled.

[0024] When 4 <D s First, drill a process hole near each of the two holes to be drilled, so that the distance between the process hole and the corresponding hole to be drilled is less than 2L. h Then drill the hole to be drilled, and halve the initial feed rate of both the process hole and the hole to be drilled to increase heat accumulation;

[0025] Step 5: Connect the cutting tool to the spindle of the CNC machine tool via the ultrasonic tool holder, clamp the workpiece on the fixture, and fix the fixture to the worktable of the CNC machine tool via the force sensor. Adjust the position of the fixture, force sensor and workpiece according to the size of the workpiece to ensure that the workpiece is within the machining range of the cutting tool.

[0026] Step 6: Check the working status of the ultrasonic scalpel holder to ensure that it can output ultrasonic vibration, and calibrate the force sensor;

[0027] Step 7: Install an infrared camera on each side of the workpiece, with the camera lens positioned higher than the workpiece, tilting downwards to monitor the real-time temperature T of the workpiece's drilling area. s ;

[0028] Step 8: Set the initial parameters for drilling. Set the vibration frequency of the ultrasonic shovel to 24KHz, the amplitude to 5μm, the feed rate to 20mm / min, the spindle speed to 2000rpm, and the real-time temperature monitoring range of the infrared camera to 550℃~650℃.

[0029] Step 9: Drill holes in the workpiece according to the drilling strategy in Step 4. During the drilling process, dynamically adjust the machining strategy based on the real-time temperature of the workpiece's drilling area.

[0030] When T s At temperatures below 550℃, reduce the feed rate and extend the single-hole machining time to promote heat accumulation;

[0031] When T s When the temperature exceeds 650℃, increase the feed rate or pause machining to reduce the real-time temperature T in the drilling zone. s ;

[0032] When 550℃≤T s At ≤650℃, maintain the current drilling feed rate.

[0033] Furthermore, the force sensor is a KISTLER9524 sensor.

[0034] Furthermore, the cutting tool is a TiAlN or TiN-coated tungsten carbide drill bit.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. Reduced drilling force: Ultrasonic vibration-assisted drilling with active heat management achieved a significant reduction in drilling force under different machining parameters, with a maximum reduction of 19.7% compared to traditional ultrasonic-assisted drilling that focuses on enhancing heat dissipation. This helps reduce tool wear.

[0037] 2. Synergistic optimization of thermal effects in continuous drilling: Unlike existing ultrasonic-assisted drilling processes that generally adopt passive heat dissipation strategies, this invention optimizes the heat utilization process through active temperature monitoring and parameter control, actively regulates the heat accumulation process, and dynamically adjusts processing parameters when the temperature rises significantly, thereby softening the material, reducing drilling force and improving processing stability in continuous drilling.

[0038] 3. Improved processing quality: During continuous drilling, the hole wall roughness is optimized by 19.4%, the burr height is significantly reduced, and the overall hole processing quality is better than that of conventional drilling.

[0039] 4. Advantages in machining thick workpieces: The heat accumulation effect is more obvious in thicker workpieces. The solution of this invention can effectively optimize the drilling performance of thick workpieces and improve the overall machining quality. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the apparatus used in the method of the present invention;

[0041] Figure 2 yes Figure 1 Enlarged view of point A;

[0042] Figure 3 This is a drilling sequence diagram of an application example of the present invention;

[0043] Figure 4 The tool movement trend diagram for drilling workpieces using the method of this invention.

[0044] In the diagram, 1. CNC machine tool, 11. Spindle, 12. Worktable, 2. Ultrasonic tool holder, 3. Tool, 4. Workpiece, 5. Fixture, 6. Force sensor, 7. Infrared camera. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0046] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0047] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0048] Example: Figures 1-4 As shown, an ultrasonic-assisted continuous drilling method for titanium alloys based on heat accumulation includes the following steps:

[0049] Step 1: Obtain the design drawing and hole distribution diagram of workpiece 4, and count the number of holes N to be drilled and the distance D between adjacent holes. s ;

[0050] Step 2: Calculate the heat transfer radius of workpiece 4 using the following formula. :

[0051] ;

[0052] In the formula: This refers to the localized thermal effect time, i.e., the drilling time for a single hole, expressed in minutes. Thermal diffusivity of the material, in meters (m). 2 / min, Calculated using the following formula:

[0053] ;

[0054] In the formula: The material density of workpiece 4 is expressed in kg / m³. 3 , Thermal conductivity of workpiece 4, in W / (m ℃), The specific heat of the material of workpiece 4 is expressed in J / kg·K.

[0055] Calculated using the following formula:

[0056] ;

[0057] In the formula, The thickness of workpiece 4 is in mm. This represents the drilling feed rate, expressed in mm / min.

[0058] Step 3: Prepare a test specimen made of the same material as workpiece 4, drill holes in the test specimen, and measure the radius of the heat-affected zone of the test specimen by microhardness testing. The test sample As workpiece 4 ;

[0059] Step 4: According to workpiece 4 and Determine the drilling strategy to be adopted:

[0060] when ≤D s ≤2 At that time, directly drill the hole to be drilled;

[0061] When 2 <D s ≤4 First, drill two process holes on the line connecting the two holes to be drilled, so that the two process holes divide the line connecting the two holes to be drilled into three equal parts, and then drill the holes to be drilled.

[0062] When 4 <D s First, drill a process hole near each of the two holes to be drilled, so that the distance between the process hole and the corresponding hole to be drilled is less than 2L. h Then drill the hole to be drilled, and halve the initial feed rate of both the process hole and the hole to be drilled to increase heat accumulation;

[0063] Step 5: Connect the cutting tool 3 to the spindle 11 of the CNC machine tool 1 via the ultrasonic tool holder 2, and clamp the workpiece 4 on the fixture 5. The fixture 5 is fixed on the worktable 12 of the CNC machine tool 1 via the force sensor 6. Adjust the position of the fixture 5, the force sensor 6 and the workpiece 4 according to the size of the workpiece 4 to ensure that the workpiece 4 is within the processing range of the cutting tool 3.

[0064] Step 6: Check the working status of the ultrasonic scalpel handle 2 to ensure that the ultrasonic scalpel handle 2 can output ultrasonic vibration, and calibrate the force sensor 6;

[0065] Step 7: Install an infrared camera 7 on each side of the workpiece 4. The lens of the infrared camera 7 is higher than that of the workpiece 4, so that the infrared camera 7 is tilted from top to bottom to monitor the real-time temperature T of the drilling area of ​​the workpiece 4. s ;

[0066] Step 8: Set the initial parameters for drilling. Set the vibration frequency of the ultrasonic shank 2 to 24KHz, the amplitude to 5μm, the feed speed to 20mm / min, the spindle speed to 2000rpm, and the real-time temperature monitoring range of the infrared camera 7 to 550℃~650℃.

[0067] Step 9: Drill holes in workpiece 4 according to the drilling strategy in Step 4. During the drilling process, dynamically adjust the machining strategy based on the real-time temperature of the drilling area of ​​workpiece 4.

[0068] When T s At temperatures below 550℃, reduce the feed rate and extend the single-hole machining time to promote heat accumulation;

[0069] When T s When the temperature exceeds 650℃, increase the feed rate or pause machining to reduce the real-time temperature T in the drilling zone. s ;

[0070] When 550℃≤T s At ≤650℃, maintain the current drilling feed rate.

[0071] Force sensor 6 is a KISTLER9524 sensor.

[0072] Tool 3 is a TiAlN or TiN-coated tungsten carbide drill bit.

[0073] This invention utilizes low-amplitude, high-frequency ultrasonic vibration to synergistically enhance the accumulation of cutting heat during continuous drilling. Combined with dynamic adjustment of processing parameters, the temperature is controlled within a reasonable range, which can improve the local plasticity of titanium alloys, reduce drilling forces, improve processing quality, optimize the processing performance of specific hole sections, and enhance the overall processing effect of continuous drilling.

[0074] Verification experiment:

[0075] The verification experiment used workpiece 4, made of Ti6Al4V material, for illustration and verification. Workpiece 4 is a rectangular plate of 24mm × 32mm, and the thickness of workpiece 4 was selected from three types: 2mm, 3mm, and 5mm.

[0076] Table 1:

[0077]

[0078] Table 1 provides typical reference values ​​for the thermal conductivity k and specific heat capacity c of Ti6Al4V material. The material density of Ti6Al4V is taken as 4.44 kg / m³. 3 The number of holes to be drilled, N, is set to 15. These 15 holes are arranged in a 3×5 rectangular array. Five rows are drilled along the length of workpiece 4, and three columns are drilled along its width. The five holes in the first column are labeled as Hole 41, Hole 42, Hole 45, Hole 46, Hole 410, Hole 411, Hole 412, Hole 413, Hole 414, Hole 415, and Hole 415. Drilling begins with Hole 41 and ends with Hole 415. Figure 3 As shown.

[0079] The heat-affected zone (HAZ) is the area where mechanical properties (such as hardness) change due to drilling mechanical stress and high temperatures. The distance between the two holes should be as large as possible. The properties of Ti6Al4V material can be obtained from preliminary experiments. Typical values ​​are generally less than 1 mm.

[0080] To illustrate the technical effects of the method of this invention, a comparative experiment was conducted between the method of this invention and a conventional ultrasonic vibration-assisted drilling method. Conventional ultrasonic vibration-assisted drilling often employs cooling methods or large amplitude to maximize heat dissipation. For comparison, a minimum quantity lubrication (MQL) cooling scheme was selected as the control group. The MQL coolant used was a conventional commercial oil-based coolant. The nozzle was fixed to the spindle and aligned with the drill bit, continuously cooling the workpiece and tool during drilling to enhance heat dissipation. The MQL method is a conventional cooling method, and its arrangement and use will not be specifically explained further.

[0081] Workpieces 4 with thicknesses of 2mm, 3mm, and 5mm were selected. Ultrasonic-assisted vibration drilling was performed under both the conditions of this invention and cooling. Fifteen holes were drilled sequentially on workpieces 4. During drilling, the drilling force was collected in real time using a KISTLER 9524 force gauge, a multi-channel charge amplifier (KISTLER 5019A), and a data acquisition unit (KISTLER 5697) at a sampling rate of 2000Hz. A 3.4mm diameter TiAlN or TiN-coated tungsten carbide drill bit was used, with a point angle of 140°, a helix angle of 30°, and a chisel edge angle of 76°. A new drill bit was used for each drilling operation to avoid the influence of tool wear on the results. Drilling temperature was monitored in real time using an infrared camera. The experimental data are recorded as shown in Table 2.

[0082] Table 2:

[0083]

[0084] Force signals during the drilling process were analyzed, and the average drilling force was calculated during the stable phase between drilling in and out. Experimental results show that, under various parameter settings, the active heat accumulation combined with ultrasonic-assisted drilling method proposed in this invention achieves lower drilling forces than under MQL-enhanced heat dissipation conditions, with a maximum reduction of 19.7%.

[0085] This indicates that by rationally controlling the heat accumulation process and synergistically utilizing local thermal effects, cutting forces during machining can be effectively reduced, tool wear can be slowed down, and machining stability can be improved.

[0086] Further analysis of the drilling force variation trend during continuous drilling based on the processing results of this invention revealed that the synergistic heat accumulation effect of ultrasonic vibration enhanced heat accumulation in the cutting zone, promoted material plasticity improvement, and resulted in a decreasing trend in drilling force during continuous drilling. Figure 3 The processing sequence shown ( Figure 3 The 15 holes in the design are experimental and the number of holes in actual applications is not limited. Using the method of this invention, workpieces 4 with thicknesses of 2mm, 3mm, and 5mm were drilled respectively. Compared with the first hole 41, the drilling force of the fifteenth hole 415 was reduced by 5.27%, 6.81%, and 8.83%, respectively. Compared with the cooling and heat dissipation ultrasonic drilling method, the drilling force required for drilling the first hole of workpieces 4 with thicknesses of 2mm, 3mm, and 5mm decreased by 5.63%, 8.54%, and 13.68%, respectively, and the drilling force required for the fifteenth hole 415 decreased by 8.83%, 13.44%, and 19.70%, respectively. This verifies the positive effect of active heat accumulation control on material softening and drilling force reduction, and further proves that by actively regulating heat accumulation, the processing performance of a specific hole (the fifteenth hole 415) can be stably improved, and the quality of subsequent holes can be guaranteed in continuous drilling.

[0087] Furthermore, as the workpiece thickness increases, the required drilling force increases. However, under the method of the present invention, the heat accumulation effect in thick workpieces is more significant, resulting in a more prominent reduction in cutting force. This effectively offsets the upward trend in drilling force caused by thickness and maintains good drilling performance.

[0088] Hole wall roughness data were obtained by scanning the hole wall and workpiece surface using a laser confocal microscopy instrument. The results show that, compared to conventional drilling, this method reduces the average hole wall roughness from 2.42 μm to 1.95 μm, an improvement of 19.4%, indicating a significant improvement in hole wall machining quality.

[0089] Although the hole wall roughness was also optimized to 1.90 μm under MQL cooling conditions, and the two methods showed similar roughness improvement, the drilling force under MQL conditions was significantly higher than that of the method of this invention, indicating that the solution of this invention has a better overall processing performance.

[0090] Drilling sequence optimization:

[0091] Prioritize machining auxiliary holes and core holes in the heat-affected zone; in sections with large hole spacing, prioritize machining adjacent holes to promote the formation of local hot zones and increase the temperature of the workpiece and tool; optimize the drilling path using the principle of the shortest heat conduction path to avoid thermal instability caused by alternating hot and cold temperatures.

[0092] After processing is completed, wait for the workpiece temperature to return to room temperature before removing it for subsequent testing.

[0093] In summary, this invention proposes a method for ultrasonic-assisted continuous drilling of titanium alloys. By using low-amplitude ultrasonic vibration to enhance heat accumulation in the cutting zone, it improves the local plasticity of the titanium alloy, reduces machining forces, enhances hole machining quality, and reduces tool wear. Using this designed machining method to drill holes in titanium alloy materials can achieve the following technical effects:

[0094] (1) Drilling force reduction: Ultrasonic vibration-assisted drilling with active heat management achieved a significant reduction in drilling force under different processing parameters, with a maximum reduction of 19.7% compared to the traditional ultrasonic-assisted drilling approach that focuses on enhancing heat dissipation. This helps reduce tool wear.

[0095] (2) Synergistic optimization of thermal effect in continuous drilling: Unlike the existing ultrasonic-assisted drilling process which generally adopts a passive heat dissipation strategy, this invention optimizes the heat utilization process through active temperature monitoring and parameter control, actively controls the heat accumulation process, and dynamically adjusts the processing parameters when the temperature rises significantly, thereby softening the material, reducing drilling force and improving processing stability in continuous drilling.

[0096] (3) Improved processing quality: During continuous drilling, the roughness of the hole wall was optimized by 19.4%, the burr height was significantly reduced, and the overall hole processing quality was better than that of conventional drilling.

[0097] (4) Advantages of machining thick workpieces: The heat accumulation effect is more obvious in thicker workpieces. The solution of the present invention can effectively optimize the drilling performance of thick workpieces and improve the overall machining quality.

[0098] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A method for ultrasonic-assisted continuous drilling of titanium alloys based on heat accumulation utilization, characterized in that, Includes the following steps: Step 1: Obtain the design drawing and hole distribution diagram of workpiece (4), and count the number of holes N to be drilled and the distance D between adjacent holes. s ; Step 2: Calculate the heat transfer radius of workpiece (4) using the following formula. : ； In the formula: This refers to the localized thermal effect time, i.e., the drilling time for a single hole, measured in minutes. Thermal diffusivity of the material, in meters (m). 2 / min, Calculated using the following formula: ； In the formula: The material density of workpiece (4) is expressed in kg / m³. 3 , The thermal conductivity of workpiece (4) is expressed in W / (m). ℃), The specific heat of the material of workpiece (4) is expressed in J / kg·K. Calculated using the following formula: ； In the formula, The thickness of workpiece (4) is in mm. This represents the drilling feed rate, expressed in mm / min. Step 3: Prepare a test specimen made of the same material as workpiece (4), drill holes in the test specimen, and measure the radius of the heat-affected zone of the test specimen by microhardness testing. The test sample As workpiece (4) ; Step 4: Based on the workpiece (4) and Determine the drilling strategy to be adopted: when ≤D s ≤2 At that time, directly drill the hole to be drilled; When 2 <D s ≤4 First, drill two process holes on the line connecting the two holes to be drilled, so that the two process holes divide the line connecting the two holes to be drilled into three equal parts, and then drill the holes to be drilled. When 4 <D s First, drill a process hole near each of the two holes to be drilled, so that the distance between the process hole and the corresponding hole to be drilled is less than 2L. h Then drill the hole to be drilled, and halve the initial feed rate of both the process hole and the hole to be drilled to increase heat accumulation; Step 5: Connect the cutting tool (3) to the spindle (11) of the CNC machine tool (1) through the ultrasonic tool holder (2), clamp the workpiece (4) on the fixture (5), and fix the fixture (5) on the worktable (12) of the CNC machine tool (1) through the force sensor (6). Adjust the position of the fixture (5), the force sensor (6) and the workpiece (4) according to the size of the workpiece (4) to ensure that the workpiece (4) is within the processing range of the cutting tool (3); Step 6: Check the working status of the ultrasonic scalpel handle (2) to ensure that the ultrasonic scalpel handle (2) can output ultrasonic vibration, and calibrate the force sensor (6). Step 7: Set up an infrared camera (7) on each side of the workpiece (4). The lens of the infrared camera (7) is higher than the workpiece (4), so that the infrared camera (7) is tilted from top to bottom to monitor the real-time temperature T of the drilling area of ​​the workpiece (4). s ; Step 8: Set the initial parameters for drilling. Set the vibration frequency of the ultrasonic shovel (2) to 24KHz, the amplitude to 5μm, the feed speed to 20mm / min, the spindle speed (11) to 2000rpm, and the real-time temperature monitoring range of the infrared camera (7) to 550℃~650℃. Step 9: Drill holes in workpiece (4) according to the drilling strategy in Step 4. During the drilling process, dynamically adjust the machining strategy according to the real-time temperature of the drilling area of ​​workpiece (4): When T s At temperatures below 550℃, reduce the feed rate and extend the single-hole machining time to promote heat accumulation; When T s When the temperature exceeds 650℃, increase the feed rate or pause machining to reduce the real-time temperature T in the drilling zone. s ; When 550℃≤T s At ≤650℃, maintain the current drilling feed rate.

2. The ultrasonic-assisted continuous drilling method for titanium alloys based on heat accumulation utilization according to claim 1, characterized in that: The force sensor (6) is a KISTLER9524 sensor.

3. The ultrasonic-assisted continuous drilling method for titanium alloys based on heat accumulation utilization according to claim 1, characterized in that: The cutting tool (3) is a TiAlN or TiN-coated tungsten carbide drill bit.

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