Piezoelectric fast knife servo device with force-displacement detection function

Abstract

The invention discloses a piezoelectric fast knife servo device with a force-displacement detection function. The piezoelectric fast knife servo device comprises a bottom plate; a clamping device is arranged on one side of the upper surface of the bottom plate, a cutting device is arranged on the other side of the upper surface of the bottom plate, the clamping device comprises a first sliding assembly arranged on the upper surface of the bottom plate, a clamping assembly used for fixing and clamping a workpiece is arranged on the first sliding assembly, and the cutting device comprises a second sliding assembly arranged on the upper surface of the bottom plate. A fixed frame is arranged on the second sliding assembly; an actuating assembly is arranged on the fixed frame, a boss is arranged at the output end of the actuating assembly, and a cutter is arranged at the front end of the boss; force-displacement detection units are arranged on the square platform and the boss. According to the invention, the force-displacement detection unit is arranged on the force flow transmission path, so that the detection signal directly corresponds to the real stress and deformation in the current displacement state, and the force-displacement synchronous detection of multi-directional component forces is realized.

Description

Technical Field

[0001] This invention relates to the field of piezoelectric fast knife servo technology, and more specifically to a piezoelectric fast knife servo device with force-displacement detection function. Background Technology

[0002] Piezoelectric fast tool servos are mainly used for ultra-precision cutting of free-form surfaces, aspherical optical components, and complex microstructure components, such as microlens arrays in optical components and the manufacture of high-precision aspherical lenses in medical optical instruments.

[0003] Recently, the development of piezoelectric fast tool servos has shown characteristics of adjustable stiffness, long stroke, and intelligence. It has shifted from improving a single structure or drive to achieving continuous adjustment of system stiffness through methods such as magnetorheological fluids and magnetorheological elastomers, and curved beam preload structures, in order to adapt to different machining conditions. At the same time, for long-stroke fast tool servos with voice coil motors or hybrid drives, folded flexible guides and inertial balancing mechanisms have been proposed to alleviate the inertial impact and bandwidth reduction problems caused by long stroke.

[0004] Existing piezoelectric fast tool servo solutions generally suffer from the following problems: 1. The design of separate amplification mechanism and guiding mechanism results in many parts and loose structure, which not only occupies a lot of space, but also reduces the overall rigidity and is prone to parasitic displacement.

[0005] 2. Focusing on displacement accuracy as the control objective, existing solutions often rely on external sensors for displacement detection, resulting in a large system size and low integration. During the cutting process, the tool not only has active feed displacement but is also subjected to multi-directional cutting forces from the workpiece, causing elastic deformation of the fast tool servo structure. Existing solutions do not achieve simultaneous detection of multi-directional forces.

[0006] 3. For multi-source sensor signals from different physical dimensions such as displacement, force, and rotation angle, there is often a lack of effective information fusion and unified timing coordination, which limits the accuracy and bandwidth of multi-dimensional collaborative control between X-axis feed motion, Z-axis fast tool servo motion and workpiece rotation motion.

[0007] 4. Currently, most systems have not yet established an active assessment and response mechanism based on real-time force and deformation feedback in terms of structural safety protection. When faced with sudden overload or excessive deformation, their self-protection capabilities are relatively limited, and there is a risk of damaging precision mechanisms or affecting processing quality. Summary of the Invention

[0008] To address the aforementioned problems in the prior art, this invention provides a piezoelectric fast tool servo device with force-displacement detection function, thereby solving the problem that existing solutions do not achieve simultaneous detection of multi-directional force components during the cutting process.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A piezoelectric high-speed tool servo device with force-displacement detection function is provided, comprising a base plate; a clamping device acting on a workpiece is provided on one side of the upper surface of the base plate, and a cutting device is provided on the other side of the upper surface of the base plate. The clamping device includes a first sliding component provided on the upper surface of the base plate, and a clamping component for fixing and clamping the workpiece is provided on the first sliding component. The cutting device includes a second sliding component provided on the upper surface of the base plate, and a fixed frame is provided on the second sliding component. An actuation component is provided on the fixed frame, and a boss is provided on the output end of the actuation component through a square platform. A cutting tool is provided at the front end of the boss. A force-displacement detection unit is provided on the square platform and the boss.

[0010] Furthermore, the first sliding assembly includes a first slide table disposed on the upper surface of the base plate, and a first slider slidably disposed on the first slide table.

[0011] Furthermore, the clamping assembly includes an L-shaped mounting plate disposed on the first slider, a brushless DC motor disposed on the L-shaped mounting plate, and a fixture for clamping the workpiece disposed at the output end of the brushless DC motor via a coupling.

[0012] Furthermore, the second sliding assembly includes a second slide table disposed on the upper surface of the base plate, and a second slider slidably disposed on the second slide table.

[0013] Furthermore, the actuation assembly includes a fixed mounting cylinder that extends through the middle of the fixed frame; an actuator is provided at the tail end inside the fixed mounting cylinder; The square platform is fixed to the front end inside the fixed mounting cylinder by a cross beam, and the output end of the actuator is connected to the square platform.

[0014] Furthermore, the actuation assembly also includes a vertical plate disposed on the upper surface of the base plate, on which a voice coil motor is disposed, and a connecting plate is disposed at the output end of the voice coil motor, the connecting plate being connected to the fixed frame.

[0015] Furthermore, the force-displacement detection unit includes multiple first strain gauges, multiple second strain gauges, and a third strain gauge; Multiple first strain gauges are respectively disposed on the upper and lower surfaces of the cross beam, and the first strain gauges are electrically connected to form a Wheatstone bridge; Multiple second strain gauges are respectively set on the side walls of the pre-reserved cavity around the square platform. The second strain gauges arranged along the X direction are electrically connected to form a Wheatstone half bridge, and the second strain gauges arranged along the Y direction are electrically connected to form another Wheatstone half bridge. The third strain gauge is installed on the inner sidewall of the boss.

[0016] Furthermore, a grating ruler is provided on the second slide, and a reading head for reading the grating ruler is provided on the second slider.

[0017] This invention discloses a piezoelectric fast knife servo device with force-displacement detection function, the advantages of which are: 1. The present invention sets up a force-displacement detection unit on the force flow transmission path of the square platform and the boss, so that the detection signal directly corresponds to the actual force and deformation under the current displacement state, thereby ensuring the consistency of the tool feed displacement state with the cutting load and the structural elastic deformation state in time and physical sense, and realizing the synchronous detection of force-displacement of multi-directional force components.

[0018] 2. This invention achieves high-frequency displacement output by setting an actuator coaxial with the fixed mounting cylinder in the Z direction, and introduces a voice coil motor in the X direction to achieve large stroke displacement adjustment, forming a two-degree-of-freedom piezoelectric fast knife servo device. This reduces unnecessary parts and forms a compact structure, which not only occupies less space, but also improves the overall rigidity and is less prone to parasitic displacement.

[0019] 3. The present invention adopts a flexible hinge integrated design formed by symmetrical arrangement of cross beams and square platforms. It does not pass through multiple levels of flexible amplification or intermediate transmission components, reducing parasitic displacement and assembly errors introduced by the flexible hinge. This not only helps to improve the stability of the fast tool servo system, but also reduces the coupling between X and Z direction movements in the structural design.

[0020] 4. The present invention integrates strain gauges in the thin-walled area of ​​the cavity reserved around the square platform, the axial bearing area inside the boss, and the stress concentration area of ​​the cross beam, embedding the sensing function into the fast knife servo structure body, realizing the integration of structure and sensing, and with small overall size and high integration. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a piezoelectric fast knife servo device with force-displacement detection function according to the present invention.

[0022] Figure 2 This is a schematic diagram of the piezoelectric fast knife servo device with force-displacement detection function from another angle, according to the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the actuation component of the present invention.

[0024] Figure 4 This is a front view of the actuation component of the present invention.

[0025] Figure 5 For the present invention Figure 4 A schematic diagram of the cross-sectional structure at point AA.

[0026] Figure 6 This is a schematic diagram illustrating the control principle of the piezoelectric fast knife servo device of the present invention.

[0027] The components are as follows: 1. Base plate; 2. Workpiece; 3. Clamping device; 31. First slide; 32. First slider; 33. L-shaped mounting plate; 34. Brushless DC motor; 35. Coupling; 36. Fixture; 4. Cutting device; 41. Fixed frame; 42. Second slide; 43. Second slider; 5. Actuation assembly; 51. Fixed mounting cylinder; 52. Actuator; 53. Vertical plate; 54. Voice coil motor; 55. Connecting plate; 6. Square platform; 61. Cross beam; 7. Boss; 8. Tool; 9. Force-displacement detection unit; 91. First strain gauge; 92. Second strain gauge; 93. Third strain gauge; 94. Grating ruler; 95. Reading head. Detailed Implementation The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0028] Example 1 refer to Figures 1-6 This embodiment provides a piezoelectric fast knife servo device with force-displacement detection function. The specific structure of this embodiment will be described in detail below.

[0029] A piezoelectric fast knife servo device with force-displacement detection function includes a base plate 1; The base plate 1 has a clamping device 3 on one side of its upper surface that acts on the workpiece 2, and a cutting device on the other side of its upper surface. The clamping device 3 includes a first sliding component on the upper surface of the base plate 1, and a clamping component for fixing and clamping the workpiece 2 is provided on the first sliding component. Specifically, the cutting device 4 includes a second sliding assembly disposed on the upper surface of the base plate 1, and a fixed frame 41 disposed on the second sliding assembly; an actuation assembly 5 disposed on the fixed frame 41, and a boss 7 disposed on the output end of the actuation assembly 5 through a square platform 6, and a cutting tool 8 disposed at the front end of the boss 7; a force-displacement detection unit 9 disposed on the square platform 6 and the boss 7.

[0030] In this embodiment, the base plate 1 serves as the basic support platform for the entire piezoelectric fast tool servo structure. Multiple sets of symmetrically arranged bolt holes are provided on the base plate 1 for fixed connection with a machine tool or other structure. The workpiece 2 is clamped by a clamping assembly, and its position is moved via a first sliding assembly. Finally, the actuation assembly 5 drives the square platform 6 and the boss 7, thereby driving the tool 8 to perform fast tool servo motion on the workpiece 2.

[0031] Specifically, the first sliding component includes a first slide table 31 disposed on the upper surface of the base plate 1, and a first slider 32 is slidably disposed on the first slide table 31.

[0032] The clamping assembly includes an L-shaped mounting plate 33 on the first slider 32, a brushless DC motor 34 on the L-shaped mounting plate 33, and a clamp 36 for clamping the workpiece 2 is provided at the output end of the brushless DC motor 34 via a coupling 35.

[0033] In this embodiment, the first slide 31 is mounted on the upper surface of the base plate 1 to provide a positional basis. The position of the clamping component is adjusted by sliding the first slider 32 on the first slide 31.

[0034] The L-shaped mounting plate 33 can be installed on the first slider 32 by inserting a bolt into the threaded hole reserved on the first slider 32. The brushless DC motor 34 is installed on the L-shaped mounting plate 33 by inserting a bolt into the threaded hole reserved on the L-shaped mounting plate 33. The brushless DC motor 34 is connected to the fixture 36 through a coupling 35. The coupling 35 is used to transmit the output torque of the motor and compensate for the small coaxiality error generated during the shaft installation process. The fixture 36 is used to hold the workpiece 2 to be processed and drives the workpiece 2 to rotate around its own axis under the drive of the brushless DC motor 34.

[0035] Alternatively, clamp 36 can be an existing precision clamp, such as the ER20 precision elastic chuck.

[0036] Specifically, the second sliding component includes a second slide table 42 disposed on the upper surface of the base plate 1, and a second slider 43 is slidably disposed on the second slide table 42.

[0037] The second slide 42 is equipped with a grating ruler 94, and the second slider 43 is equipped with a reading head 95 for reading the grating ruler 94.

[0038] In this embodiment, the second slide 42 is mounted on the upper surface of the base plate 1 to provide a positional basis. The position of the actuation component 5 is adjusted by sliding the second slider 43 on the second slide 42.

[0039] A reading head 95 is installed in the middle of the second slider 43, and a grating ruler 94 is fixed on the second slide table 42. The reading head 95 moves along the guide rail of the second slide table 42 together with the second slider 43. Driven by the voice coil motor 54, the second slider 43 moves linearly relative to the second slide table 42, and a relative displacement is generated between the reading head 95 and the grating ruler 94. The reading head 95 scans the lines of the grating ruler 94 and outputs an electrical signal corresponding to the displacement, realizing real-time detection of the displacement of the second slider 43 in the X direction.

[0040] Specifically, the actuation component 5 includes a fixed mounting cylinder 51 that runs through the middle of the fixed frame 41; an actuator 52 is provided at the tail end inside the fixed mounting cylinder 51; the square platform 6 is fixed to the head end inside the fixed mounting cylinder 51 by a cross beam 61, and the output end of the actuator 52 is connected to the square platform 6, and the actuator 52 drives the square platform 6 to perform high-speed micro-motion.

[0041] Specifically, the actuation component 5 also includes a vertical plate 53 disposed on the upper surface of the base plate 1. A voice coil motor 54 is disposed on the vertical plate 53. A connecting plate 55 is disposed at the output end of the voice coil motor 54. The connecting plate 55 is connected to the fixed frame 41. The voice coil motor 54 drives the fixed mounting cylinder 51 to perform a large stroke movement.

[0042] In this embodiment, the fixed frame 41 is an integral rigid structure. A fixed mounting cylinder 51 is provided through the middle of the fixed frame 41. An actuator 52 is provided inside the fixed mounting cylinder 51 to form a Z-axis drive unit. The output end of the voice coil motor 54 is connected to the outside of the fixed frame 41 through a connecting plate 55 to form an X-axis drive unit. The X-axis and Z-axis drive units are then fixed on the fixed frame 41 to form a closed force flow path.

[0043] The Z-axis drive unit includes a fixed mounting cylinder 51, an actuator 52, a square platform 6, a cross beam 61, and a boss 7. The fixed mounting cylinder 51 is disposed through the middle of the fixed frame 41. The actuator 52 is coaxially mounted with the fixed mounting cylinder 51 at the rear end of the inner cavity of the fixed mounting cylinder 51. The square platform 6 is fixed to the front end of the inner cavity of the fixed mounting cylinder 51 by the cross beam 61. The cross beam 61 is a flexible beam, so that the square platform 6, the symmetrically arranged flexible beams, and the fixed mounting cylinder 51 form an integrated flexible hinge structure. Furthermore, the end of the square platform 6 abuts against the output end of the actuator 52, so that the actuator 52 is always under pressure during operation. When the actuator 52 undergoes axial extension and contraction under the action of the driving voltage, the elastic deformation of the cross beam 61 drives the square platform 6, the boss 7 on it, and the tool 8 to generate high-frequency micro-displacement along the Z direction, realizing fast tool servo motion.

[0044] Among them, actuator 52 adopts an existing stacked piezoelectric ceramic actuator, such as the VS series low-voltage cylindrical piezoelectric ceramic actuator (e.g., PSt150 / 7 / 20VS12).

[0045] The square platform 6 and the boss 7 are an integral structure, and the tool 8 is installed in the mounting groove on the boss 7.

[0046] The X-axis drive unit includes a vertical plate 53, a voice coil motor 54, a connecting plate 55, a second slider 43, and a second slide table 42. The vertical plate 53 is vertically mounted on the base plate 1. The voice coil motor 54 is fixedly mounted on the vertical plate 53, and the output end of the voice coil motor 54 is connected to one side of the connecting plate 55. The other side of the connecting plate 55 is connected to the fixed frame 41. Thus, the voice coil motor 54 drives the connecting plate 55 to perform telescopic movement, which in turn drives the fixed frame 41 to perform telescopic movement, thereby driving the second slider 43 and the second slide table 42 to achieve X-axis translation.

[0047] Specifically, the force-displacement detection unit 9 includes multiple first strain gauges 91, multiple second strain gauges 92, and a third strain gauge 93; Multiple first strain gauges 91 are respectively disposed on the upper and lower surfaces of the cross beam 61, and the first strain gauges 91 are electrically connected to form a Wheatstone bridge; Multiple second strain gauges 92 are respectively disposed on the side walls of the pre-reserved cavities around the square platform 6, and the second strain gauges 92 arranged along the X direction are electrically connected to form a Wheatstone half bridge, and the second strain gauges 92 arranged along the Y direction are electrically connected to form another Wheatstone half bridge. The third strain gauge 93 is disposed on the inner side wall of the boss 7.

[0048] In this embodiment, the first strain gauge 91, multiple second strain gauges 92, and the third strain gauge 93 all adopt existing metal foil strain gauges, specifically model LY11-2.5 / 120. Resistive sensors have advantages such as high sensitivity, small size, strong adhesion, and resistance to high and low temperatures and high pressures. Their principle utilizes the deformation of the component, which causes a change in the resistance inside the strain gauge bonded to its surface. The rate of resistance change is directly proportional to the resistance in the specified direction at the measurement point, i.e.: Where K is the sensitivity coefficient, which is generally taken as 2-2.2. The change in resistance causes the change in the output voltage of the bridge, which is then recorded by the recorder and finally converted into strain, and then the force F and displacement are obtained by reverse deduction.

[0049] In this embodiment, the region most sensitive to strain in the fast-tool servo structure is designated as the strain gauge detection area. During the cutting process, the tool 8 is subjected to cutting forces from multiple directions, including X, Y, and Z. The force flow transmission path within the Z-direction drive unit structure causes elastic deformation of the boss 7, the square platform 6, or the cross beam 61.

[0050] Since the cross beams 61 are symmetrically distributed, first strain gauges 91 are only provided on the upper and lower surfaces of the upper cross beam 61, and on the upper and lower surfaces of the left cross beam 61, with corresponding resistances R. 1A =R 1B =R 2A =R 2B This forms a Wheatstone full-bridge measurement circuit. When stationary, the bridge output voltage is:

[0051] The cross beam 61 bears the Z-axis load and the driving force output by the actuator 52. When the actuator 52 is driven, the cross beam 61 produces elastic deformation mainly in the bending direction. Each strain gauge will generate strain, which will affect R... 1A R 1B and R 2A R 2B The strain and resistance are denoted as ε. 1A ε 1B ε 2A ε 2B and R 1A , R 1B , R 2A , R 2B .get:

[0052] use get:

[0053] make This leads to the strain output of the bridge circuit:

[0054] The output signal of the bridge can be calibrated to reflect the trend of Z-axis load change and the deformation state of the cross beam, and can also serve as a feedback signal for dynamic detection of abnormalities in the fast tool servo, thereby constraining the amplitude and operating frequency of the fast tool servo.

[0055] The thin-walled region with pre-reserved cavities around the square platform 6 is located on the transverse force transmission path between the tool 7 and the square platform 6, exhibiting a significant strain response to the cutting force components in the X and Y directions. On the inner side of this thin-walled region, second strain gauges 92 are symmetrically arranged along the X direction and the Y direction, forming two sets of Wheatstone half-bridge measurement circuits. Because the two sets of strain gauges are orthogonally arranged, the X-direction half-bridge primarily responds to transverse deformation in the X direction, and the Y-direction half-bridge primarily responds to transverse deformation in the Y direction, thus achieving decoupled detection of the cutting force components in the X and Y directions. By synchronously acquiring the output voltage signals of the two half-bridges and calibrating them, the strain values ​​in the X and Y directions can be calculated. Combined with the structural mechanics model, the cutting force components in the X and Y directions can be calculated from the strain values.

[0056] Two second strain gauges 92 in the X direction are attached to both sides of the thin wall. When an X-direction force is applied, they produce strains of equal magnitude but opposite direction. Two second strain gauges 92 in the Y direction are attached to both sides of the thin wall. When a Y-direction force is applied, they produce strains of equal magnitude but opposite direction.

[0057] The output voltage of the half-bridge is directly proportional to the strain in the X direction. After calibration, the strain amplitude in the X direction can be obtained. :

[0058] Where, ε 3A ε 3B The strain is measured by the two second strain gauges 92 in the X direction.

[0059] Similarly, strain in the Y direction This can be obtained through the Y-axis half-bridge output:

[0060] Where, ε 4A ε 4B The strain is measured by the two second strain gauges 92 in the Y direction.

[0061] Finally, by combining material properties and structural parameters, it can be determined that... , Calculate the cutting components in the X and Y directions.

[0062] By arranging strain gauges in different stress concentration areas, elastic deformation caused by multi-directional cutting forces during force flow transmission within the fast tool servo structure can be converted into usable detection signals without the need for external force sensors. This enables real-time sensing of changes in cutting load and structural deformation. Furthermore, since the strain gauge detection locations align with the motion and force paths of the fast tool servo structure, the detection results reflect the stress and deformation state of the tool during actual machining, providing a reliable physical basis for subsequent displacement detection, collaborative control, and structural safety assessment.

[0063] In this embodiment, the axial bearing area inside the boss 7 is in the axial force transmission link of the tool 8. When the tool 8 is subjected to Z-direction cutting force, the axial bearing area undergoes axial elastic deformation. The third strain gauge 93 attached to the surface of the straight beam outputs a corresponding strain signal. After calibration, this signal can quantitatively characterize the magnitude of the Z-direction cutting load. The cross beam 61 bears the driving force output by the actuator 52 and is superimposed with the Z-direction cutting load. The first strain gauge 91 arranged on its upper and lower surfaces is used to measure the bending stress generated by the cross beam 61 under the cutting load, thereby obtaining the Z-direction load change and structural deformation state.

[0064] The thin-walled area of ​​the cavity around the square platform 6 is located on the transverse force transmission path between the tool 8 and the structure, and is relatively sensitive to the deformation caused by the cutting force in the X and Y directions. The large-stroke feed displacement in the X direction is detected in real time by the grating ruler 94 set between the second slide 42 and the second slider 43.

[0065] During the cutting process, the cutting force on the tool 8 is transmitted to the fixed frame 41 via the boss 7, the square platform 6, and the cross beam 61. Strain gauges are arranged on key structural parts along the aforementioned force transmission path, so that the detected strain signals directly correspond to the actual force and deformation under the current displacement state. Since displacement detection and strain detection both act on the same force transmission path and are synchronously sampled and processed by the same control unit within the same control cycle, the consistency of the tool feed displacement state with the cutting load and the elastic deformation state of the structure in terms of time and physics is ensured, thus achieving synchronous force-displacement detection.

[0066] Optionally, the brushless DC motor 34, actuator 52, voice coil motor 54, reading head 95, and first strain gauge 91, second strain gauge 92, and third strain gauge 93 are all connected to the signals of an external control system.

[0067] The rotation of workpiece 2 is driven by brushless DC motor 34, thus providing the time and angle reference signals for the machining process. The X-axis feed is driven by voice coil motor 54, enabling the tool 8 to move along the X-axis with a large stroke. The X-axis displacement detection channel is formed by grating ruler 94 and reading head 95. The reading head 95 feeds the displacement information back to the control system, acquiring the macroscopic position of tool 8 relative to workpiece 2 in real time as a macroscopic positioning quantity. Together with the rotation angle θ of workpiece 2, it is used to determine the spatial position relationship of tool 8 in the coordinate system of workpiece 2.

[0068] The Z-axis fast tool servo is driven by actuator 52. High-frequency micro-displacement is superimposed on the X-axis feed trajectory. Strain gauges arranged in the axial bearing area of ​​the boss 7, the cross beam 61 and the thin-walled area around the square platform 6 constitute a force-deformation-displacement detection unit. The control unit processes the feedback signal to obtain the Z-axis cutting load and structural deformation state, and estimates the additional deformation caused by the load in combination with the structural characteristic model. This is used to constrain and compensate the Z-axis fast tool servo motion online.

[0069] The control system uses the spindle rotation angle of the brushless DC motor 34 as a timing reference, combines the X-axis displacement to determine the position of the tool 8 in the coordinate system, and generates the Z-axis target trajectory according to the preset machining trajectory or control command. The drive output of the Z-axis drive unit is constrained by the structural deformation state. When the strain signal reflects abnormal changes in cutting load or structural deformation, the control system dynamically adjusts the output amplitude and operating frequency range of the Z-axis fast tool, and can also reduce the X-axis feed rate to ensure that the three-axis motion remains coordinated under load disturbance.

[0070] The control system includes a data acquisition unit, a main control unit, and a drive execution unit. The data acquisition unit synchronously samples the force-deformation-displacement signals from the strain gauges and the displacement signals from the grating ruler; the main control unit is implemented using an industrial controller, digital signal processor, or FPGA, and executes multi-source signal fusion and control algorithms; the drive execution unit drives and controls the X-axis voice coil motor, the Z-axis actuator, and the spindle brushless DC motor respectively, thereby realizing the coordinated control of the three-axis motion.

[0071] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A piezoelectric fast knife servo device with force-displacement detection function, characterized in that: Includes a base plate (1); a clamping device (3) acting on the workpiece (2) is provided on one side of the upper surface of the base plate (1), and a cutting device is provided on the other side of the upper surface of the base plate (1); The clamping device (3) includes a first sliding component with a base plate (1) on its upper surface, and the first sliding component is provided with a clamping component for fixing and clamping the workpiece (2); The cutting device (4) includes a second sliding assembly disposed on the upper surface of the base plate (1), and a fixed frame (41) disposed on the second sliding assembly; an actuation assembly (5) is disposed on the fixed frame (41), and a boss (7) is disposed on the output end of the actuation assembly (5) through a square platform (6), and a cutting tool (8) is disposed at the front end of the boss (7); a force-displacement detection unit (9) is disposed on the square platform (6) and the boss (7).

2. The piezoelectric fast knife servo device with force-displacement detection function according to claim 1, characterized in that: The first sliding component includes a first slide (31) disposed on the upper surface of the base plate (1) and a first slider (32) slidably disposed on the first slide (31).

3. The piezoelectric fast knife servo device with force-displacement detection function according to claim 2, characterized in that: The clamping assembly includes an L-shaped mounting plate (33) on a first slider (32), a brushless DC motor (34) on the L-shaped mounting plate (33), and a clamp (36) for clamping the workpiece (2) is provided at the output end of the brushless DC motor (34) via a coupling (35).

4. The piezoelectric fast knife servo device with force-displacement detection function according to claim 1, characterized in that: The second sliding component includes a second slide (42) disposed on the upper surface of the base plate (1) and a second slider (43) slidably disposed on the second slide (42).

5. The piezoelectric fast knife servo device with force-displacement detection function according to claim 4, characterized in that: The actuation assembly (5) includes a fixed mounting cylinder (51) that runs through the middle of the fixed frame (41); an actuator (52) is provided at the tail end inside the fixed mounting cylinder (51). The square platform (6) is fixed to the head end inside the fixed mounting cylinder (51) by a cross beam (61), and the output end of the actuator (52) is connected to the square platform (6); the actuator (52) drives the square platform (6) to perform high-speed micro-motion.

6. The piezoelectric fast knife servo device with force-displacement detection function according to claim 5, characterized in that: The actuation component (5) also includes a vertical plate (53) disposed on the upper surface of the base plate (1), a voice coil motor (54) is disposed on the vertical plate (53), a connecting plate (55) is disposed at the output end of the voice coil motor (54), and the connecting plate (55) is connected to the fixed frame (41); the voice coil motor (54) drives the fixed mounting cylinder (51) to perform a large stroke movement.

7. The piezoelectric fast knife servo device with force-displacement detection function according to claim 5, characterized in that: The force-displacement detection unit (9) includes multiple first strain gauges (91), multiple second strain gauges (92), and a third strain gauge (93). Multiple first strain gauges (91) are respectively disposed on the upper and lower surfaces of the cross beam (61), and the first strain gauges (91) are electrically connected to form a Wheatstone bridge; Multiple second strain gauges (92) are respectively disposed on the sidewalls of the pre-reserved cavity around the square platform (6), and the second strain gauges (92) arranged along the X direction are electrically connected to form a Wheatstone half bridge, and the second strain gauges (92) arranged along the Y direction are electrically connected to form another Wheatstone half bridge. The third strain gauge (93) is disposed on the inner side wall of the boss (7).

8. The piezoelectric fast knife servo device with force-displacement detection function according to claim 4, characterized in that: The force-displacement detection unit (9) further includes a grating ruler (94) disposed on the second slide (42) and a reading head (95) disposed on the second slider (43) to read the grating ruler (94).

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