Tool bending deformation testing device

Abstract

The application discloses a tool bending deformation testing device, and belongs to the technical field of machining detection, which is used to solve the problems of low efficiency and poor synchronism of the existing tool bending deformation measurement method. The device comprises a rotary driving module, a tool tip clamp module, a conductive detection module and a control module, wherein the rotary driving module is provided with a tool handle insertion port and a first angle encoder, the tool tip clamp module is provided with a tool tip insertion port and a second angle encoder, the bottom surface of the tool tip clamp module is provided with a conductive contact surface and is slidingly installed on an insulating guide rail; the conductive detection module comprises a pair of conductive electrodes laid below the insulating guide rail, the conductive contact surface is in contact with the double electrodes to form a closed loop circuit in the initial state; when the tool tip bending causes the clamp to be separated from the insulating guide rail, the circuit is disconnected, the control module synchronously records the angle data of the two encoders and calculates the permanent deformation angle γ = α + β. The device realizes the rapid and accurate measurement of tool bending deformation through the combination of electricity and machinery, and is mainly used for the quality detection and service life evaluation of industrial tools.

Description

Technical Field

[0001] This invention belongs to the field of machining inspection technology, and specifically relates to a tool bending deformation testing device. Background Technology

[0002] In the field of machining, tool bending deformation is one of the key factors affecting machining accuracy and tool life. Currently, two main methods are used to measure tool bending deformation: contact measurement and non-contact measurement. These methods have several limitations in practical applications.

[0003] Contact measurement typically uses dial indicators or displacement sensors to directly contact the tool surface. This method requires manual adjustment of the measurement position by the operator, resulting in low measurement efficiency. Because the measurement process relies on manual operation, it is difficult to guarantee the synchronization of data between different measurement points. Furthermore, contact measurement poses safety hazards in the inspection of high-speed rotating tools and is difficult to implement dynamic measurements. When it is necessary to simultaneously measure the tool's rotation angle and bending angle, traditional contact measurement devices lack an effective synchronization mechanism, leading to time differences in the measurement data.

[0004] Non-contact measurement primarily employs laser displacement sensors or vision inspection systems. While these methods avoid the risks of contact measurement, they are highly sensitive to environmental conditions. Common workshop elements such as coolant, chips, and vibration can all affect measurement accuracy. Laser measurement systems require complex optical path calibration, resulting in high maintenance costs. Vision inspection systems, limited by image acquisition frequency, struggle to capture the instantaneous deformation of cutting tools during high-speed rotation. Furthermore, non-contact measurement equipment is typically bulky, making integration into existing production lines difficult.

[0005] Existing technologies also include some strain gauge-based measurement methods. These methods attach strain gauges to the surface of the cutting tool and detect deformation by measuring changes in resistance. However, the installation position and adhesion quality of the strain gauges significantly affect the measurement results. During long-term use, strain gauges are prone to detachment due to tool vibration, requiring frequent replacement. Furthermore, strain gauge signals are susceptible to electromagnetic interference, resulting in insufficient stability in industrial environments.

[0006] When measuring the permanent deformation angle of a cutting tool, existing methods often require separate measurements of the initial state and the deformed state, followed by calculation of the deformation amount. This step-by-step measurement method is not only time-consuming, but also leads to increased errors due to potential changes in the measurement reference. Especially in situations where simultaneous acquisition of rotation and bending angles is required, existing devices struggle to achieve synchronous acquisition of both parameters.

[0007] The main reason for these problems is the lack of effective triggering mechanisms and data synchronization schemes in traditional measuring devices. When the tool undergoes bending deformation, the measuring system struggles to capture this instantaneous change in state in a timely manner. Furthermore, the structural design of most measuring devices does not consider the ease of tool clamping or the need for automation in the measurement process, resulting in complex operation and low measurement efficiency.

[0008] In attempting to solve these problems, researchers faced numerous difficulties. First, how to integrate angle measurement and deformation detection functions within a limited space. Second, how to design a reliable triggering mechanism to ensure accurate measurement initiation the instant of tool deformation. Finally, the data synchronization problem between different sensors needed to be solved, which placed high demands on the system's real-time performance and accuracy. These technical challenges limited the practicality and widespread applicability of existing measuring devices. Summary of the Invention

[0009] This invention provides a tool bending deformation testing device, which achieves rapid and accurate measurement of tool bending deformation through electromechanical integration. It is mainly used for quality inspection and life assessment of industrial tools. It solves the problems of existing tool bending deformation measurement devices, which struggle to simultaneously record the tool rotation angle and bending angle, leading to asynchronous measurement data and large errors; traditional methods involve step-by-step measurement, resulting in low efficiency; and lack a reliable triggering mechanism to capture instantaneous changes in the deformation state.

[0010] To achieve these objectives and other advantages according to the present invention, a tool bending deformation testing device is provided, comprising: A rotary drive module is provided with a tool holder insertion port for clamping a tool holder. The insertion direction of the tool holder insertion port is perpendicular to the rotation direction of the rotary drive module. A first angle encoder is provided on the rotary drive module for measuring the rotation angle β of the tool holder. A blade tip clamping module is provided with a blade tip insertion port for clamping the blade tip. The blade tip insertion port is opposite to the blade handle insertion port and is located on the same straight line. A second angle encoder is fixedly installed on the blade tip clamping module for measuring the bending angle α of the blade tip. A conductive contact surface is provided on the bottom surface of the blade tip clamping module. The blade tip clamping module is slidably mounted on an insulated guide rail. The conductivity detection module includes a pair of conductive electrodes laid on the bottom surface of the insulating guide rail. In the initial state, the conductive contact surface of the blade tip clamp module is in contact with the pair of conductive electrodes simultaneously, and together with the external circuit, they form a closed-loop circuit. The rotation drive module drives the blade holder to rotate, causing the blade tip to bend. When the blade tip clamp module is disengaged from the insulating guide rail, the closed-loop circuit is disconnected. The control module is used to synchronously record the angle data of the first angle encoder and the second angle encoder when the closed-loop circuit is disconnected, and to calculate the permanent deformation angle γ, where γ = α + β.

[0011] Preferably, the conductive contact surface of the blade tip clamping module is an elastic copper alloy slider, which is pressed and connected to a pair of conductive electrodes in the initial clamping state.

[0012] Preferably, the conductive electrode is two parallel anti-oxidation copper alloy electrode strips, the length direction of which is consistent with the sliding direction of the insulating guide rail. The conductive electrode is fixed in a first groove on the bottom surface of the insulating guide rail, the depth of which is equal to the thickness of the conductive electrode, so that the upper surface of the conductive electrode is flush with the bottom surface of the insulating guide rail. The conductive contact surface is in contact with both conductive electrodes, and the two conductive electrodes are respectively connected to the positive and negative terminals of an external circuit.

[0013] Preferably, a V-shaped elastic chuck is provided in the clamping cavity of the blade tip insertion port to clamp blade tips of different thicknesses. The V-shaped elastic chuck adopts a multi-layer composite structure, including: The outer layer is made of highly elastic stainless steel, and the outer surface of the outer layer abuts against the inner wall of the clamping cavity; The middle layer is a silicone rubber cushioning pad used to absorb clamping vibrations; The inner layer is a liner that is in direct contact with the blade tip, and the outer surface of the inner layer is provided with serrated anti-slip texture. It is also provided with a self-locking structure, the self-locking structure including; A pair of miniature electromagnets are respectively disposed in the middle of the side wall of the V-shaped elastic clamp. The pair of miniature electromagnets are connected in parallel and connected to the control module through wires to form an energized circuit. When the closed-loop circuit is broken, the two miniature electromagnets are energized, and the electromagnets on both sides attract each other to enhance the clamping force.

[0014] Preferably, when the closed-loop circuit is disconnected, the control module is used to synchronously record the angle data of the first angle encoder and the second angle encoder. Specifically, a sampling resistor is connected in series in the external circuit; a current detection chip has its input terminal connected to both ends of the sampling resistor, and its output terminal is communicatively connected to the control module; when the control module receives the trigger signal that the closed-loop circuit is disconnected, it sends a synchronous acquisition command to the first angle encoder and the second angle encoder, and also sends a power-on command to the miniature electromagnet. The control module adopts a high-precision clock synchronization mechanism to acquire the angle data of the first angle encoder and the second angle encoder at the same time, thereby obtaining the permanent deformation angle γ.

[0015] Preferably, the rotation drive module includes: An orthogonal rotation mechanism, comprising: A fixed base is mounted with a horizontal rotating shaft perpendicular to the longitudinal axis of the tool via bearings; A rotating bracket is fixedly mounted on the horizontal rotating shaft; A tool holder holder is fixedly mounted on the rotating bracket, and the axis of the tool holder insertion port of the tool holder holder coincides with the longitudinal axis of the tool. The drive unit includes: A servo motor, which is connected to a drive gear via a harmonic reducer; The driven gear is fixed on the horizontal rotating shaft and meshes with the driving gear. The gear ratio between the driving gear and the driven gear is 1:5. A first angle encoder is fixedly mounted at the end of the horizontal rotating shaft; The first angle encoder has a resolution of not less than 0.001°, and its signal output terminal is communicatively connected to the control module.

[0016] Preferably, the inner wall of the tool holder insertion port is provided with a replaceable modular elastic bushing, the elastic bushing comprising: A basic annular support is fixedly mounted on the inner wall of the tool holder insertion port. A T-shaped guide groove is provided on the inner surface of the basic annular support, and a magnetic sheet is placed in the T-shaped guide groove. A replaceable clamping block is made of shape memory alloy. The inner surface of the replaceable clamping block forms an adaptive clamping cavity. The contour of the adaptive clamping cavity matches the shape of the tool holder through the elastic deformation of the shape memory alloy and returns to its initial shape after the tool holder is removed. A T-shaped protrusion adapted to the T-shaped guide groove is provided at the bottom of the replaceable clamping block. A permanent magnet is embedded in the T-shaped protrusion and attracts the magnetic sheet in the T-shaped guide groove. A silicone buffer layer covers the outer surface of the replaceable clamping block and avoids the T-shaped protrusion area.

[0017] Preferably, the shape memory alloy is a nickel-titanium alloy with a phase transformation temperature of 25-50℃, and the silicone buffer layer has a Shore hardness of 40A-60A and a thickness of 1.5±0.2mm.

[0018] Preferably, the control module is also connected to a data storage unit and a display unit. The data storage unit is used to record the permanent deformation angle γ and the corresponding test time for each test. The display unit is used to display the angle data α, β and γ in real time and provide a test completion prompt signal.

[0019] Preferably, recesses are provided at equal intervals on both sides of the insulating guide rail, with each recess corresponding to a tool length. When the tool tip clamping module slides to the test position, a stop block is inserted into the recess away from the tool, preventing the tool tip clamping module from moving away from the tool.

[0020] The present invention has at least the following beneficial effects: First, the dual-encoder design of the rotary drive module and the tool tip clamp module enables synchronous measurement of the rotation angle β and bending angle α, solving the problem of data asynchrony in traditional methods. The closed-loop circuit triggering mechanism of the conductivity detection module ensures accurate capture of data at the moment of deformation, improving measurement efficiency and accuracy. The elastic copper alloy slider has good conductivity and wear resistance, reducing contact resistance fluctuations and oxidation effects, ensuring stable circuit conduction, and extending the device's service life. The parallel arrangement of the anti-oxidation copper alloy electrode strips and the first groove fixing method enhance electrode stability, avoiding poor contact caused by vibration or contamination, while simplifying installation and maintenance procedures. The cooperation of the recess and stop ensures accurate positioning of the tool tip clamp module, avoiding the influence of sliding offset on measurement results, and improving test repeatability and reliability.

[0021] Secondly, the multi-layer composite structure of the V-shaped elastic chuck is adaptable to tools of different thicknesses. The serrated anti-slip texture and silicone rubber buffer pad improve clamping stability, and the self-locking function of the miniature electromagnet further enhances the clamping force, preventing the tool from loosening during the measurement process.

[0022] Third, the high-precision clock synchronization mechanism and the cooperation of the current detection chip in the control module ensure strict synchronization of encoder data at the moment the circuit is disconnected, which significantly improves the accuracy of the calculation of the permanent deformation angle γ.

[0023] Fourth, for the rotary drive module, the combination of a harmonic reducer and a servo motor provides high transmission accuracy and low backlash error. The 1:5 gear ratio optimizes torque transmission, making the measurement of the rotation angle β more reliable. Modular elastic bushings, through the adaptive deformation of shape memory alloys, match different tool holder shapes. The T-shaped guide groove and permanent magnet design simplify the replacement process, improving the device's versatility and clamping efficiency. The phase transformation temperature range of the nickel-titanium alloy (25-50℃) ensures the stability of the clamping force at room temperature, and the optimized hardness of the silicone buffer layer (40A-60A) guarantees both buffering effect and avoids excessive deformation.

[0024] Fifth, the data storage unit and display unit enable real-time recording and visualization of measurement data, facilitating subsequent analysis and process optimization, and improving the practicality of the device and user experience.

[0025] Other advantages, objectives and features of the present invention will be apparent in part from the following description, and in part from what those skilled in the art will understand through study and practice of the invention. Attached Figure Description

[0026] Figure 1 This is a top view schematic diagram of the tool bending deformation testing device of the present invention; Figure 2 This is a side view of the tool tip clamp module in this invention. Figure 3 This is a side view of the V-shaped elastic chuck in the tool tip clamp module of the present invention when the tool tip is not inserted. Figure 4 This is a side view of the V-shaped elastic chuck inserted into the blade tip in the blade tip clamp module of the present invention; Figure 5 This is a side view of the rotary drive module in this invention. Figure 6 This is a schematic diagram of the basic annular support in the rotary drive module of the present invention; Figure 7 This is a schematic diagram illustrating the relationship between the control modules in this invention. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0028] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0029] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials mentioned are commercially available. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0030] like Figures 1-7 As shown, the present invention provides a tool bending deformation testing device, comprising: a rotary drive module 1, which is provided with a tool holder insertion port 1140 for clamping a tool holder 920, the insertion direction of the tool holder insertion port 1140 being perpendicular to the rotation direction of the rotary drive module 1; a first angle encoder 3 being provided on the rotary drive module 1 for measuring the rotation angle β of the tool holder 920; and a tool tip clamping module 2, which is provided with a tool tip insertion port 210 for clamping a tool tip 910, the tool tip insertion port 210 being opposite to and on the same straight line as the tool holder insertion port 1140; a second angle encoder 6 being fixedly provided on the tool tip clamping module 2 for measuring the bending angle α of the tool tip 910. The bottom surface of the tool tip clamping module 2 is provided with a conductive contact surface 220. The tool tip clamping module 2 is slidably mounted on an insulating guide rail 4. The conductive detection module includes a pair of conductive electrodes 5 laid below the insulating guide rail 4. In the initial state, the conductive contact surface 220 of the tool tip clamping module 2 is in contact with the pair of conductive electrodes 5 simultaneously, forming a closed-loop circuit with the external circuit. The rotation drive module 1 drives the tool handle 920 to rotate, causing the tool tip 910 to bend. When the tool tip clamping module 2 disengages from the insulating guide rail 4, the closed-loop circuit is disconnected. The control module, when the closed-loop circuit is disconnected, is used to synchronously record the angle data of the first angle encoder 3 and the second angle encoder 6, and calculate the permanent deformation angle γ, γ=α+β. The conductive contact surface 220 of the tool tip clamping module 2 is an elastic copper alloy slider, which is pressed and connected to the pair of conductive electrodes 5 in the initial clamping state.

[0031] In the above embodiment, by setting up a rotary drive module 1 and a tool tip clamping module 2, and cooperating with dual-angle encoders—that is, a first angle encoder 3 measuring the rotation angle β and a second angle encoder 6 measuring the bending angle α—synchronous high-precision measurement of the rotation and bending deformation of the tool 9 is achieved. The conductive contact surface 220 uses an elastic copper alloy slider, which combines conductivity and wear resistance. The conductive electrodes 5 can be made of anti-oxidation copper. The parallel arrangement of the conductive electrodes 5 reduces contact resistance fluctuations. The stable contact between the conductive contact surface 220 and the conductive electrodes 5 ensures the reliability of circuit on / off triggering, thereby accurately capturing the instantaneous state of deformation and reducing human error. The conductive contact surface 220 simultaneously contacts a pair of conductive electrodes 5 and, together with the external circuit, forms a closed-loop circuit. The automatic on / off design of the closed-loop circuit replaces the traditional manual triggering or step-by-step measurement method. When the tool tip 910 bends, causing the tool tip clamping module 2 to detach from the insulating guide rail 4, the circuit disconnects and automatically triggers the control module to synchronously record data, requiring no manual intervention and significantly improving testing efficiency, especially suitable for batch tool 9 inspection. The blade tip clamp module 2 is slidably mounted on the insulating guide rail 4. By sliding the blade tip clamp module 2, the distance between the blade tip clamp module 2 and the rotary drive module 1 can be adjusted to accommodate the entire blade 9, allowing the blade 9 to be placed horizontally. First, the blade shank 920 is inserted into the blade shank insertion port 1140, and then the blade tip 910 is easily inserted into the blade tip insertion port 210 by sliding the blade tip clamp module 2. At this time, the position of the blade tip clamp module 2 is the testing position of the blade 9. In addition, the blade tip clamp module 2, slidably mounted on the insulating guide rail 4, can also test blades 9 of different lengths.

[0032] In practice, the rotary drive module 1 achieves low-speed, high-torque rotation. The rotary drive module 1 slowly rotates, driving the entire tool 9 to rotate. The first angle encoder 3 measures the rotation angle β of the tool holder 920 in real time. Since the tool tip 910 is inserted into the tool tip insertion port 210, under the influence of gravity from the tool tip clamping module 2, the tool tip 910 slowly bends. The tool tip clamping module 2 rotates with the bending of the tool 9 but does not completely leave the insulating guide rail 4. The second angle encoder 6 measures the bending angle α of the tool tip 910 in real time. The rotary drive module 1 continues to rotate until the tool tip clamping module 2 completely disengages from the insulating guide rail 4, causing the conductive contact surface 220 to leave the conductive electrode 5, thereby breaking the closed-loop circuit. When the closed-loop circuit is broken, the control module synchronously acquires the angle data measured by the first angle encoder 3 and the second angle encoder 6, thereby calculating the permanent deformation angle γ, where γ = α + β. After the test is completed, the rotary drive module 1 no longer applies force to the tool holder 920, causing the rotary drive module 1 to rotate in the opposite direction.

[0033] The blade tip clamping module 2 is slidably mounted on the insulating guide rail 4. A conductive contact surface 220 is provided on the bottom surface of the blade tip clamping module 9. The width of the conductive contact surface 220 can be the same as the width of the insulating guide rail 4, or slightly smaller. The length of the conductive contact surface 220 can be the same as the length of the bottom surface of the blade tip clamping module 2. For example, the conductive contact surface 220 can be made of a beryllium copper alloy slider with a thickness of 4-5 mm, and its beryllium content can be controlled between 1.8% and 2.0%. The insulating guide rail 4 can be made of ceramic-coated aluminum alloy profile; for example, its length can be set to 300 mm. A pair of conductive electrodes 5 are arranged parallel to each other in the first groove 410 on the bottom surface of the insulating guide rail 4. The upper surface of the electrodes must be flush with the bottom surface of the insulating guide rail 4 to avoid affecting the sliding of the blade tip clamp module 2. The distance between the two conductive electrodes 5 should not be too close; for example, the distance can be set to 3-6 cm. The conductive electrodes 5 can be made of 0.5 mm thick anti-oxidation copper alloy strip, and the width can be designed to be 5 mm. The closed-loop circuit can only be activated when the conductive contact surface 220 is in contact with both conductive electrodes 5 simultaneously. The power supply voltage of the closed-loop circuit can be set to 5V DC, and the sampling resistor can be 10 ohms. The module operates as follows: initially, the conductive contact surface 220 simultaneously contacts the two conductive electrodes 5 to form a circuit; when the blade tip 910 bends, causing the conductive contact surface 220 to detach, the circuit is disconnected.

[0034] The control module can use an industrial-grade PLC controller with a clock synchronization accuracy of 1 microsecond. The data acquisition cycle can be set to 1 millisecond. The operation of the control module is as follows: after detecting the closed-loop circuit disconnection signal, it immediately reads the angle values ​​of the first angle encoder 3 and the second angle encoder 6, and calculates the permanent deformation angle. The technical effect is to achieve precise synchronous measurement of the bending deformation of the tool 9, with the measurement error controlled within 0.01 degrees.

[0035] In one specific embodiment, the conductive electrode 5 is two parallel anti-oxidation copper alloy electrode strips, the length direction of which is consistent with the sliding direction of the insulating guide rail 4. The conductive electrode 5 is fixed in a first groove 410 on the bottom surface of the insulating guide rail 4. The depth of the first groove 410 is equal to the thickness of the conductive electrode 5, so that the upper surface of the conductive electrode 5 is flush with the bottom surface of the insulating guide rail 4. The conductive contact surface 220 is in contact with both conductive electrodes 5, and the two conductive electrodes 5 are respectively connected to the positive and negative terminals of the external circuit.

[0036] In the above embodiment, the conductive electrode 5 is made of an anti-oxidation copper alloy. The material of the conductive electrode 5 is corrosion-resistant and does not easily oxidize over long-term use, ensuring stable conductivity and improving both stability and reliability. The conductive electrode 5 is fixed in the first groove 410 on the bottom surface of the insulating guide rail 4 using a groove-embedded fixing method. The thickness of the conductive electrode 5 is consistent with the depth of the first groove 410, and its upper surface is flush with the bottom surface of the guide rail, avoiding protrusion wear or foreign object jamming, and reducing the risk of poor contact. The two conductive electrodes 5 are arranged in parallel, consistent with the sliding direction, ensuring that the conductive contact surface 220 always synchronously contacts the two conductive electrodes 5, avoiding current interruption caused by unilateral contact. There is no height difference between the conductive electrode 5 and the bottom surface of the insulating guide rail 4, resulting in uniform contact pressure and reduced contact resistance. The conductive electrode 5 is pre-embedded in the first groove 410, eliminating the need for additional alignment during installation and simplifying the assembly process. If the electrode is damaged, it can be directly removed from the first groove 410 for replacement without disassembling the entire guide rail system, facilitating replacement. The structure of the first groove 410 also prevents accidental short circuits of the conductive electrode 5. The two conductive electrodes are connected 5 points to the positive and negative terminals to avoid the risk of reverse circuit due to incorrect connection.

[0037] In specific configurations, the conductive electrode 5 can be 20-30mm shorter than the insulating rail 4, and a 5mm wide terminal block 11 can be reserved at its end. The surface of the conductive electrode 5 can be polished, and the surface roughness can be controlled below Ra0.8. The material of the conductive electrode 5 can be C5191 phosphor bronze, which has good elasticity and oxidation resistance. A rectangular groove with a depth of 0.5mm can be machined into the bottom of the insulating rail 4, and its width can be 0.1-0.2mm wider than that of the conductive electrode 5. The first groove 410 can be arranged along the entire length of the rail, and limit blocks can be set at both ends. The conductive electrode 5 can be fixed in the first groove 410 by bonding with conductive adhesive or by using pressure strips. The material of the insulating rail 4 can be alumina ceramic or glass fiber reinforced nylon.

[0038] External circuit connections can be made using 2.54mm pitch connectors, soldered to the terminal 11 at the end of the conductive electrode 5 furthest from the tool 9. The circuit operating voltage can be set to 5V DC, and the sampling resistor can be a 50-ohm, 1% precision metal film resistor. The wires can be arranged along the side of the insulated rail 4 and secured with cable ties. During operation, when the conductive contact surface 220 simultaneously contacts both conductive electrodes 5, the circuit current can be maintained within the range of 80-90mA. The technical effect is to ensure reliable contact of the conductive electrodes 5, reduce contact resistance fluctuations, and improve detection sensitivity.

[0039] In one specific implementation, such as Figure 3 and Figure 4As shown, a V-shaped elastic chuck 7 is provided in the clamping cavity of the blade tip insertion port 210 to clamp blade tips 910 of different thicknesses. The V-shaped elastic chuck 7 adopts a multi-layer composite structure, including: The outer layer is made of highly elastic stainless steel, and the outer surface of the outer layer abuts against the inner wall of the clamping cavity; The middle layer is a silicone rubber cushioning pad used to absorb clamping vibrations; The inner layer is a liner that is in direct contact with the blade tip 910. The outer surface of the inner layer is provided with serrated anti-slip texture. It is also provided with a self-locking structure, the self-locking structure including; A pair of miniature electromagnets 8 are respectively disposed in the middle of the side wall of the V-shaped elastic clamp 7. The pair of miniature electromagnets 8 are connected in parallel and connected to the control module through wires to form an energized circuit. When the closed-loop circuit is broken, the two miniature electromagnets 8 are energized, and the electromagnets on both sides attract each other to enhance the clamping force.

[0040] In the above embodiment, the multi-layer composite structure design of the V-shaped elastic chuck 7, through the synergistic effect of the highly elastic stainless steel outer layer, the silicone rubber buffer middle layer, and the damage-resistant inner liner, can adaptively clamp tool tips 910 of different thicknesses. The outer serrated texture provides strong friction to prevent slippage, the middle silicone layer effectively absorbs the vibration generated when the tool tip 910 bends, and the inner liner avoids direct metal-to-metal contact that could damage the surface of the tool 9. The specially equipped electromagnetic self-locking system is automatically triggered when the closed-loop circuit is broken, and the two miniature electromagnets 8 instantly attract each other, greatly improving the clamping force and effectively preventing accidental loosening during testing. This composite design achieves multiple improvements in clamping stability, tool 9 protection, and operational safety.

[0041] In specific settings, the opening angle of the V-shaped elastic chuck 7 is 60°±5°. When clamping the blade tip 910, the maximum deformation of the V-shaped opening is ≤3mm, ensuring that within the elastic range, the clamping range can accommodate blade tip 910 thicknesses of 2-5mm. The outer layer of the V-shaped elastic chuck 7 is made of austenitic stainless steel 304 or 301FH (high hardness type), cold-rolled and hardened, with a yield strength ≥800MPa, elastic modulus 193GPa, and elongation at break ≥40%. The elastic deformation of its V-shaped opening is controlled within 80% of the material's elastic limit, meaning it can completely recover its initial shape after maximum deformation. The intermediate layer of silicone rubber buffer pad can be made of a material with a hardness of 50A, and its thickness can be set to 2-3mm. The inner liner can be made of polytetrafluoroethylene, with a thickness controlled at 0.5-1.0mm. The serrated anti-slip texture on the inner surface can be designed to be 0.3mm deep and 1mm apart. The V-shaped flexible chuck 7 can be installed in the clamping cavity of the blade tip insertion port 210 and fixed by bolts.

[0042] The self-locking miniature electromagnet 8 can be a flat electromagnet with a thickness controlled at 3-5mm and a diameter of 4-5mm. Its operating voltage can be set to 12V DC. The flat electromagnet can be symmetrically installed in the middle of both sides of the chuck. The miniature electromagnet 8 adopts a flat design, with a single-sided static attraction force of 8N±0.5N. Under steady-state energization at 12V DC, it can generate a 30%-40% instantaneous peak increase (10.4N~11.2N) within 0.1s of initial energization. When both electromagnets work together, the combined clamping force can reach 20N~30N, sufficient to prevent the tool tip 910 from slipping during testing. The energization response time is <50ms. The lead wire can be 0.3mm² high-temperature resistant silicone wire, arranged along the outside of the V-shaped elastic chuck 7, and connected to the control module. After testing, the miniature electromagnet 8 disconnects, and the V-shaped elastic chuck 7 returns to its original position.

[0043] When the tool tip 910 is inserted into the V-shaped elastic chuck 7, the V-shaped structure automatically adapts to different thicknesses, and the serrated texture provides initial clamping force. When the closed-loop circuit disconnects the trigger signal, the miniature electromagnet 8 is immediately energized to generate opposing attraction forces, further enhancing clamping stability. The technical effect is to achieve reliable clamping of tools 9 of different thicknesses, avoid displacement errors during the measurement process, and protect the surface of the tool 9 from damage.

[0044] In one specific embodiment, when the closed-loop circuit is disconnected, the control module is used to synchronously record the angle data of the first angle encoder 3 and the second angle encoder 6. Specifically, a sampling resistor is connected in series in the external circuit; a current detection chip has its input terminal connected to both ends of the sampling resistor, and its output terminal is communicatively connected to the control module; when the control module receives the trigger signal that the closed-loop circuit is disconnected, it sends a synchronous acquisition command to the first angle encoder 3 and the second angle encoder 6, and also sends a power-on command to the miniature electromagnet 8. The control module adopts a high-precision clock synchronization mechanism to acquire the angle data of the first angle encoder 3 and the second angle encoder 6 at the same time, thereby obtaining the permanent deformation angle γ.

[0045] In the above implementation, the circuit status is monitored in real time by a series sampling resistor and a current detection chip. When an open circuit signal is detected, the control module immediately triggers a triple synchronous response: first, a synchronous acquisition command is sent to the two angle encoders; second, the locking mechanism of the miniature electromagnet 8 is activated; and third, the angle data of the two angle encoders at this moment is accurately recorded based on high-precision clock synchronization technology (time deviation <1μs), from which the permanent deformation angle γ can be calculated. This design not only prevents mechanical loss of control caused by power failure, i.e., the tool tip 910 falling out of the tool tip clamping module 2, but also eliminates the angle error of traditional time-division detection through synchronous acquisition, which can greatly improve the measurement accuracy of the deformation angle.

[0046] In specific configurations, the sampling resistor in the external circuit can be a 50-ohm resistor, and the current detection chip can be a Hall effect sensor with an accuracy of 0.5%. The detection current threshold can be set to 0.1-0.5mA; if the current falls below the threshold, the circuit is considered open. The sampling resistor can be soldered into the lead loop of conductive electrode 5, and the current detection chip can be installed at the input terminal of the control module. The signal transmission delay can be controlled within 1ms to ensure rapid response to changes in circuit state.

[0047] In specific implementation, the first angle encoder 3 can be an absolute photoelectric encoder, for example, a Heidenhain RON 786C with a 23-bit resolution and an EnDat 2.2 bidirectional digital interface, capable of matching the high-precision transmission of the servo motor 121 and harmonic reducer 122 in the rotary drive module 1. The second angle encoder 6 can be a Renishaw RESOLUTE™ absolute grating with a resolution of 0.001° and a sampling frequency of 1kHz, connected to the control module via an RS422 interface. The bending angle α of the blade tip 910 requires high dynamic response; the grating encoder has no mechanical contact wear, and its nanometer-level resolution can capture minute deformations, making it suitable for vibration environments. The control module can be configured with dual-channel synchronous acquisition, completing data reading from both angle encoders within 10ms after receiving a disconnection signal. The interfaces of the two angle encoders can use RS422 differential signal transmission, providing strong anti-interference capabilities. The data acquisition period can be set to 1ms to ensure real-time angle changes.

[0048] Specifically, the control module employs a scheme combining hardware interrupt triggering and IEEE 1588 clock synchronization to achieve synchronous angle data acquisition. Specifically, the current detection chip generates a hardware interrupt signal when the closed-loop circuit is disconnected. After receiving the interrupt, the FPGA programmable logic unit simultaneously triggers the first angle encoder 3 and the second angle encoder 6 to freeze the current angle value via a synchronization pulse (SYNC). The control module incorporates the IEEE 1588 precision clock protocol, ensuring that the time reference deviation between the two encoders is less than 100ns. The entire data acquisition delay is controlled within 10μs, and the angle calculation error does not exceed 0.001°.

[0049] The miniature electromagnet 8 control system allows for a 20ms pre-energization time, preparing in advance before the closed-loop circuit disconnection signal arrives. The energization duration can be set to 500ms to ensure stable clamping. The control signal can use PWM modulation, with a duty cycle adjustable within the range of 30-70%. The miniature electromagnet 8 drive circuit can utilize MOSFET switching transistors, achieving a response time within 1ms. The technical advantages include high-precision synchronous angle acquisition and reliable clamping control, ensuring the accuracy and repeatability of measurement data.

[0050] In one specific implementation, such as Figure 5 As shown, the rotation drive module 1 includes: Rotating mechanism 110, comprising: A fixed base 111 is equipped with a horizontal rotating shaft 112 perpendicular to the longitudinal axis of the tool 9 via a bearing; A rotating bracket 113 is fixedly mounted on the horizontal rotating shaft 112; The tool holder 114 is fixedly mounted on the rotating bracket 113, and the axis of the tool holder insertion port of the tool holder 114 coincides with the longitudinal axis of the tool 9. Drive unit 120, which includes: A servo motor 121 is connected to a drive gear 124 via a harmonic reducer 122; Driven gear 123 is fixed on the horizontal rotating shaft 112 and meshes with drive gear 124. The gear ratio of drive gear 124 to driven gear 123 is 1:5. The first angle encoder 3 is fixedly mounted at the end of the horizontal rotating shaft 112; The first angle encoder 3 has a resolution of not less than 0.001°, and its signal output terminal is communicatively connected to the control module.

[0051] In the above embodiment, the rotary drive module 1 achieves stable driving and accurate angle measurement in the bending deformation test of the tool 9 through the coordinated design of the high-precision transmission system of the rotary mechanism 110 and the drive unit 120. Its core advantages are: the fixed base 111 supports the horizontal rotation axis 112 through a high-rigidity bearing, ensuring that the perpendicularity error between the horizontal rotation axis 112 and the longitudinal axis of the tool 9 is less than 0.005mm, thus eliminating the measurement deviation caused by the eccentric torque at the root; the integrated design of the rotary bracket 113 and the tool holder clamp 114 ensures that the axis of the tool holder insertion port is strictly coincident with the theoretical axis of the tool 9, and the clamping coaxiality reaches the level of 0.01mm, establishing an accurate benchmark for subsequent angle measurement; the drive unit 120 uses a servo motor 121 and a harmonic reducer 122 to form a closed loop. The ring control system, with a 1:5 gear reduction ratio, amplifies the output torque to 50 Nm while controlling the backlash to within 0.001°. This meets the testing requirements for low speed and high torque, with the speed stabilized in the 0.5-5 rpm range, while avoiding the backlash error of traditional worm gear drives. The first angle encoder 3 is directly mounted at the end of the horizontal rotating shaft 112, capturing minute angle changes of 0.001° in real time through a 23-bit absolute photoelectric encoder. Its EnDat digital interface transmits data synchronously to the control module at a sampling rate of 1 MHz. Combined with the IEEE 1588 clock protocol, the measurement delay of angle data β is less than 1 μs, ensuring that the calculation error of the permanent deformation angle γ does not exceed 0.002° when synchronized with the data from the second angle encoder 6. This rotary drive module 1 significantly improves the efficiency and reliability of the bending deformation test of the tool 9.

[0052] In specific configuration, the fixed base 111 of the rotating mechanism 110 can be made of HT250 cast iron, the horizontal rotating shaft 112 can be made of GCr15 bearing steel, and the diameter can be designed to be 20-25mm. The rotating bracket 113 can be made of aluminum alloy 6061, and the thickness can be controlled to be 10-15mm. The bearings can be angular contact ball bearings, and the precision grade can reach P4. The bottom of the fixed base 111 can be provided with 4 M8 mounting holes for fixing to the worktable. In specific implementation, a through second groove 1110 is provided on the upper surface of the fixed base 111, and through holes are provided on the two side walls of the second groove 1110. A bearing is provided in each through hole, the horizontal rotating shaft 112 is set in two bearings, the rotating bracket 113 is fixedly fitted on the horizontal rotating shaft 112 between the two bearings, and the tool holder 114 is then fixed on the rotating bracket 113.

[0053] The servo motor 121 of the drive unit 120 can be a 400W AC servo motor 121, with a rated speed of 3000rpm and an output torque of 50Nm. The drive gear 124 can be made of 20CrMnTi material and has 20 teeth. The driven gear 123 is made of the same material and has 100 teeth, with the gear backlash controlled within the range of 0.05-0.08mm. The servo motor 121 can be mounted on the side of the fixed base 111 and connected to the reducer 122 via a coupling. The reducer 122 is set with a reduction ratio of 1:50.

[0054] In one specific implementation, such as Figure 6 As shown, the inner wall of the tool holder insertion port 1140 is provided with a replaceable modular elastic bushing, the elastic bushing comprising; A basic annular support 10 is fixedly mounted on the inner wall of the tool holder insertion port. A T-shaped guide groove 101 is provided on the inner surface of the basic annular support 10, and a magnetic sheet is provided in the T-shaped guide groove 101. A replaceable clamping block is made of shape memory alloy. The inner surface of the replaceable clamping block forms an adaptive clamping cavity. The contour of the adaptive clamping cavity matches the shape of the tool holder 920 through the elastic deformation of the shape memory alloy, and returns to its initial shape after the tool holder 920 is removed. A T-shaped protrusion adapted to the T-shaped guide groove 101 is provided at the bottom of the replaceable clamping block. A permanent magnet is embedded in the T-shaped protrusion and attracts the magnetic sheet in the T-shaped guide groove 101. A silicone buffer layer covers the outer surface of the replaceable clamping block and avoids the T-shaped protrusion area.

[0055] The shape memory alloy is a nickel-titanium alloy with a phase transformation temperature of 25-50℃, and the silicone buffer layer has a Shore hardness of 40A-60A and a thickness of 1.5±0.2mm.

[0056] In the above embodiments, the modular elastic bushing design has multiple beneficial effects: First, the replaceable clamping block made of shape memory alloy can adapt to different tool holder 920 shapes, elastically deforming under pressure to tightly fit the surface of the tool holder 920, and automatically returning to its initial shape after the tool holder 920 is removed, significantly improving the versatility and reusability of clamping; Second, the cooperation design of the T-shaped guide groove 101 with the permanent magnet and magnetic sheet simplifies the replacement process of the replaceable clamping block, and the magnetic fixing method ensures the stability of the installation and avoids the inconvenience of disassembly caused by threaded connections; Third, the silicone buffer layer covers the outer surface of the clamping block, absorbing the deformation stress of the shape memory alloy. The silicone buffer layer avoids hard contact between the shape memory alloy and the base ring support 10, extending its service life. At the same time, its Shore hardness of 40A-60A and thickness of 1.5mm±0.2mm optimize the balance between buffering effect and structural strength; In addition, the modular design allows for quick replacement of the appropriate clamping block for different specifications of tools 9, improving the flexibility and work efficiency of the equipment. Overall, this structure achieves comprehensive optimization of high-precision clamping, convenient maintenance, and tool protection, making it particularly suitable for batch testing scenarios.

[0057] In specific configuration, the basic annular support 10 can be made of 45# steel. The basic annular support 10 is heated to 120℃ and then hot-fitted with an interference fit of 0.02-0.03mm, forming a tight fit after cooling. Two M3 threaded holes can be machined on the end face of the basic annular support 10 for installing locating pins. T-shaped guide grooves 101 can be installed on the lower support of the basic annular support 10. One or two T-shaped guide grooves 101 can be installed, and they can be machined to a width of 6mm and a depth of 4mm. The magnetic sheet can be made of 1mm thick electrical pure iron and fixed to the bottom of the groove with adhesive. The replaceable clamping block is made of nickel-titanium (NiTi) shape memory alloy, possessing super elasticity and shape memory effect. It is soft and deformable at room temperature (20-25℃), allowing easy adjustment of the clamping angle and automatic springback to maintain stable clamping force. Heating restores its initial shape: when the temperature rises above 40℃, the replaceable clamping block automatically returns to the preset shape for easy reuse. The replaceable clamping block can be designed with a thickness of 3-5mm. Its inner surface is machined with a gradient curvature profile to accommodate different diameters, such as the 920 tool holder with diameters ranging from Φ6 to Φ20mm. The T-shaped protrusion can be designed with a width of 5.8mm and a height of 3.8mm, maintaining a 0.1-0.2mm clearance with the T-shaped guide groove 101. The permanent magnet can be made of N35 neodymium iron boron material, with dimensions of 4×4×2mm, and is fixed inside the T-shaped protrusion using epoxy resin. The replaceable clamping block maintains its preset shape at room temperature and returns to its original shape after being deformed under pressure and heated to 40℃. The silicone buffer layer can be made of silicone rubber with a Shore hardness of 50A, injection molded onto the outer surface of the replaceable clamping block, with a thickness controllable between 1.2-1.8mm. A 1mm deep clearance groove can be provided in the T-shaped protrusion area of ​​the silicone buffer layer to avoid affecting sliding. The bonding strength between silicone and metal can reach over 3MPa, making it resistant to detachment over long-term use. During operation, when the tool holder 920 is inserted, the replaceable clamping block automatically adapts to different shapes, and the buffer layer absorbs the deformation stress of the shape memory alloy. This technology achieves stable clamping of tool holders 920 with different shapes. Through the precise fit between the T-shaped guide groove 101 and the T-shaped protrusion, the replaceable clamping block can be quickly positioned under magnetic attraction, while the elastic deformation characteristics of the shape memory alloy ensure full contact of the clamping surface of the tool holder 920.

[0058] In one specific embodiment, the control module is further connected to a data storage unit and a display unit. The data storage unit is used to record the permanent deformation angle γ and the corresponding test time for each test. The display unit is used to display the angle data α, β and γ in real time and provide a test completion prompt signal.

[0059] In the above implementation, the data storage unit can be an industrial-grade SD card storage module with a storage capacity of 8-32GB. The data recording format can be a CSV file, with each record containing a timestamp, angle data α, β, and γ, and a timestamp accuracy of 1ms. The storage interval can be set to automatic saving after each test or real-time storage, with the sampling frequency adjustable within the range of 1-10Hz. The display unit can be a 7-inch TFT LCD screen with a resolution of 800×480 pixels. The screen can display the currently measured α, β, and γ angle values ​​in real time, with a refresh rate of 10Hz. The test completion prompt signal can be achieved through a buzzer and an LED indicator. The buzzer can be a 3-5V DC active type with a sound frequency of 2kHz and a duration of 0.5-1 second. The LED indicator can be tri-color: green for standby, yellow for testing, and red for test completion. The trigger threshold for the prompt signal can be set to a γ angle value stabilization time exceeding 3 seconds, or manual confirmation by the operator. The technical benefits include providing complete data recording and visualization capabilities, making the testing process and results more intuitive and reliable.

[0060] In one specific embodiment, recesses are provided at equal intervals on both sides of the insulating guide rail 4, and each recess corresponds to the length of a tool 9. When the tool tip clamping module 2 slides to the test position, a stop block is inserted into the recess away from the tool 9, so that the tool tip clamping module 2 cannot move away from the tool 9.

[0061] In the above embodiment, equidistant recesses with a spacing of 50mm can be machined on both sides of the insulating guide rail 4. The diameter of the recesses can be designed to be 6mm, and the depth can be controlled to be 3mm. The recesses can be semi-circular, and the edges can be chamfered by 0.2mm to avoid stress concentration. The position of the recesses can be set according to the length of commonly used cutting tools 9, such as three standard positions of 150mm, 200mm, and 250mm. The insulating guide rail 4 can be installed on the upper surface of the test platform and fixed by four M6 bolts, with the flatness error controlled within 0.05mm / m.

[0062] The stop block can be made of 45# steel, with a hardness of HRC40-45. The contact surface of the stop block can be designed as an arc shape with a radius of 5mm to match the recess. The height of the stop block can be designed to be 15mm, and the width can be set to 10mm. It is fixed to the side of the insulating guide rail 4 with M5 screws. When the 910 tool tip clamp slides to the test position, the stop block can quickly engage with the corresponding recess, maintaining a positional accuracy within ±0.1mm.

[0063] During operation, the operator selects the corresponding recess position based on the length of the cutting tool 9 and pushes the stop into place to lock it. After the cutting tool tip clamp module 2 moves into position, the engagement between the stop and the recess prevents accidental displacement of the clamp during testing. The technical effect is to ensure accurate positioning of the test location, avoid measurement errors caused by clamp slippage, and improve the repeatability and reliability of the test results.

[0064] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the invention will be readily apparent to those skilled in the art.

[0065] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A tool bending deformation testing device, characterized in that, include: A rotary drive module is provided with a tool holder insertion port for clamping a tool holder. The insertion direction of the tool holder insertion port is perpendicular to the rotation direction of the rotary drive module. A first angle encoder is provided on the rotary drive module for measuring the rotation angle β of the tool holder. A blade tip clamping module is provided with a blade tip insertion port for clamping the blade tip. The blade tip insertion port is opposite to the blade handle insertion port and is located on the same straight line. A second angle encoder is fixedly installed on the blade tip clamping module for measuring the bending angle α of the blade tip. A conductive contact surface is provided on the bottom surface of the blade tip clamping module. The blade tip clamping module is slidably mounted on an insulated guide rail. The conductivity detection module includes a pair of conductive electrodes laid on the bottom surface of the insulating guide rail. In the initial state, the conductive contact surface of the blade tip clamp module is in contact with the pair of conductive electrodes simultaneously, and together with the external circuit, they form a closed-loop circuit. The rotation drive module drives the blade holder to rotate, causing the blade tip to bend. When the blade tip clamp module is disengaged from the insulating guide rail, the closed-loop circuit is disconnected. The control module is used to synchronously record the angle data of the first angle encoder and the second angle encoder when the closed-loop circuit is disconnected, and to calculate the permanent deformation angle γ, where γ = α + β.

2. The tool bending deformation testing device as described in claim 1, characterized in that, The conductive contact surface of the blade tip clamping module is an elastic copper alloy slider, which is pressed and connected to a pair of conductive electrodes in the initial clamping state.

3. The tool bending deformation testing device as described in claim 2, characterized in that, The conductive electrode consists of two parallel anti-oxidation copper alloy electrode strips, the length of which is consistent with the sliding direction of the insulating guide rail. The conductive electrode is fixed in a first groove on the bottom surface of the insulating guide rail. The depth of the first groove is equal to the thickness of the conductive electrode, so that the upper surface of the conductive electrode is flush with the bottom surface of the insulating guide rail. The conductive contact surface is in contact with both conductive electrodes, and the two conductive electrodes are respectively connected to the positive and negative terminals of an external circuit.

4. The tool bending deformation testing device as described in claim 1, characterized in that, A V-shaped elastic chuck is provided in the clamping cavity of the blade tip insertion port to clamp blade tips of different thicknesses. The V-shaped elastic chuck adopts a multi-layer composite structure, including: The outer layer is made of highly elastic stainless steel, and the outer surface of the outer layer abuts against the inner wall of the clamping cavity; The middle layer is a silicone rubber cushioning pad used to absorb clamping vibrations; The inner layer is a liner that is in direct contact with the blade tip, and the outer surface of the inner layer is provided with serrated anti-slip texture. It is also provided with a self-locking structure, the self-locking structure including; A pair of miniature electromagnets are respectively disposed in the middle of the side wall of the V-shaped elastic clamp. The pair of miniature electromagnets are connected in parallel and connected to the control module through wires to form an energized circuit. When the closed-loop circuit is broken, the two miniature electromagnets are energized, and the electromagnets on both sides attract each other to enhance the clamping force.

5. The tool bending deformation testing device as described in claim 4, characterized in that, When the closed-loop circuit is disconnected, the control module is used to synchronously record the angle data of the first angle encoder and the second angle encoder. Specifically, a sampling resistor is connected in series in the external circuit; a current detection chip has its input terminal connected to both ends of the sampling resistor, and its output terminal is communicatively connected to the control module; when the control module receives the trigger signal that the closed-loop circuit is disconnected, it sends a synchronous acquisition command to the first angle encoder and the second angle encoder, and also sends a power-on command to the miniature electromagnet. The control module adopts a high-precision clock synchronization mechanism to acquire the angle data of the first angle encoder and the second angle encoder at the same time, thereby obtaining the permanent deformation angle γ.

6. The tool bending deformation testing device as described in claim 1, characterized in that, The rotation drive module includes: An orthogonal rotation mechanism, comprising: A fixed base is mounted with a horizontal rotating shaft perpendicular to the longitudinal axis of the tool via bearings; A rotating bracket is fixedly mounted on the horizontal rotating shaft; A tool holder holder is fixedly mounted on the rotating bracket, and the axis of the tool holder insertion port of the tool holder holder coincides with the longitudinal axis of the tool. The drive unit includes: A servo motor, which is connected to a drive gear via a harmonic reducer; The driven gear is fixed on the horizontal rotating shaft and meshes with the driving gear. The gear ratio between the driving gear and the driven gear is 1:

5. A first angle encoder is fixedly mounted at the end of the horizontal rotating shaft; The first angle encoder has a resolution of not less than 0.001°, and its signal output terminal is communicatively connected to the control module.

7. The tool bending deformation testing device as described in claim 6, characterized in that, The inner wall of the tool holder insertion port is provided with a replaceable modular elastic bushing, the elastic bushing comprising: A basic annular support is fixedly mounted on the inner wall of the tool holder insertion port. A T-shaped guide groove is provided on the inner surface of the basic annular support, and a magnetic sheet is placed in the T-shaped guide groove. A replaceable clamping block is made of shape memory alloy. The inner surface of the replaceable clamping block forms an adaptive clamping cavity. The contour of the adaptive clamping cavity matches the shape of the tool holder through the elastic deformation of the shape memory alloy and returns to its initial shape after the tool holder is removed. A T-shaped protrusion adapted to the T-shaped guide groove is provided at the bottom of the replaceable clamping block. A permanent magnet is embedded in the T-shaped protrusion and attracts the magnetic sheet in the T-shaped guide groove. A silicone buffer layer covers the outer surface of the replaceable clamping block and avoids the T-shaped protrusion area.

8. The tool bending deformation testing device as described in claim 7, characterized in that, The shape memory alloy is a nickel-titanium alloy with a phase transformation temperature of 25-50℃, and the silicone buffer layer has a Shore hardness of 40A-60A and a thickness of 1.5±0.2mm.

9. The tool bending deformation testing device as described in claim 1, characterized in that, The control module is also connected to a data storage unit and a display unit. The data storage unit is used to record the permanent deformation angle γ and the corresponding test time for each test. The display unit is used to display the angle data α, β and γ in real time and provide a test completion prompt signal.

10. The tool bending deformation testing device as described in claim 1, characterized in that, The insulating guide rail has equally spaced recesses on both sides, each recess corresponding to a tool length. When the tool tip clamping module slides to the test position, the stop block is inserted into the recess away from the tool, so that the tool tip clamping module cannot move away from the tool.

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