A special-shaped flexible material cutting device for anti-shake

Abstract

The present invention relates to a trimming device for anti-vibration special-shaped flexible materials, aiming to solve the problems of low trimming accuracy, low trimming efficiency and unstable trimming caused by the easy non-periodic random impact and jitter of the cutting tool during trimming in the existing trimming device. The device comprises a frame, a stepping movement mechanism, a rotary tool mechanism, a tool holder, a tool shaft, a voice coil motor, a capacitive displacement sensor, a drive board and a controller. The tool shaft is suspended and installed, and the cooperation of the fixed inner magnetic ring and the outer magnetic ring can achieve anti-impact in the radial direction of the tool shaft. The capacitive displacement sensor can detect the axial jitter of the blade and transmit it to the controller. The controller converts it into the frequency domain through Fourier transform and analyzes its frequency, amplitude and phase, and then converts it into corresponding control signals and transmits them to the voice coil motor. The motor drive block of the voice coil motor drives the voice coil mover to move in real time in the opposite direction to the tool shaft, and the voice coil mover is fixed to the tool shaft to offset the jitter of the tool shaft, realizing the active elimination of the axial jitter of the cutting tool.

Description

Technical Field

[0001] The present invention relates to a trimming device for anti - jitter special - shaped flexible materials. Background Art

[0002] Special - shaped flexible materials refer to flexible materials with uneven thickness, toughness, hardness, etc. at various parts. When performing efficient trimming operations, materials with different toughness and hardness have different forms of force on the cutting tool during trimming operations. Especially when cutting uneven materials, the cutting tool will be subjected to non - periodic random impacts, resulting in radial and axial jitters of the cutting tool, which will greatly affect the trimming quality of efficient trimming operations. Summary of the Invention

[0003] The purpose of the present invention is to provide a trimming device for anti - jitter special - shaped flexible materials, so as to solve the technical problems that when the existing trimming device trims special - shaped flexible materials, the cutting tool is easily subjected to non - periodic random impacts and jitters, resulting in low trimming accuracy, low trimming efficiency, and unstable trimming.

[0004] The technical solution of the present invention is as follows:

[0005] The trimming device for anti - jitter special - shaped flexible materials includes:

[0006] A frame;

[0007] A stepping movement mechanism, installed on the frame, including output ends that can move in three mutually perpendicular directions of X, Y, and Z;

[0008] A rotary cutter mechanism, suspended on the output end, including a bracket and a connecting shaft rotatably assembled on the bracket. The axis of the connecting shaft is vertically arranged, and a rotary cutter driving mechanism for driving the connecting shaft to rotate around its axis is also installed on the bracket;

[0009] A tool holder, installed at the lower part of the connecting shaft, including a rectangular block and a U - shaped frame arranged at the lower part of the rectangular block. The U - shaped frame includes two side plates arranged in parallel at intervals. Mounting through - holes are respectively arranged on the two side plates of the U - shaped frame. The two mounting through - holes are coaxially arranged, and fixed outer magnetic rings are installed in the mounting through - holes;

[0010] A tool shaft, with a blade installed in the middle. The tool shaft is inserted through the mounting through - hole and the driving hole. Fixed inner magnetic rings are sleeved on the tool shaft corresponding to the fixed outer magnetic rings one by one. The fixed inner magnetic rings and the fixed outer magnetic rings are arranged with opposite polarities to repel each other;

[0011] A voice coil motor, including a cylindrical motor driving block and a cylindrical voice coil mover driven by the motor driving block. The motor driving block is sleeved outside the voice coil mover and fixed relative to one side plate of the U - shaped frame. The voice coil mover is sleeved and fixed on the tool shaft;

[0012] The capacitive displacement sensor is used to detect the axial displacement of the blade, is cylindrical, is sleeved on the blade shaft and is fixed relative to the other side plate of the U-shaped frame;

[0013] There are two drive plates, which are respectively attached to the outside of the two side plates. The two drive plates are respectively provided with drive holes, which are coaxially arranged with the mounting through hole, and a plurality of drive electromagnets are evenly distributed on the inner circumference of the drive holes; a mover magnet is arranged on the knife shaft corresponding to each drive electromagnet in the two drive holes, and the mover magnet is driven to rotate after the drive electromagnet is energized;

[0014] The controller is used to control the voice coil motor to provide a reverse displacement according to the blade axial displacement signal fed back by the capacitive displacement sensor.

[0015] Furthermore, the driving hole is a hexagonal hole, and a driving electromagnet is respectively arranged on the six sides of the driving hole. The cross-sections of the two sections on the knife shaft corresponding to the two driving holes are hexagonal, and a movable magnet is respectively arranged on the six sides of the hexagon.

[0016] Furthermore, the rotary cutter driving mechanism comprises a driving motor, a driving synchronous pulley, a synchronous belt and a driven synchronous pulley which are sequentially connected in transmission, and the driven synchronous pulley is fixed on the connecting shaft.

[0017] Furthermore, the stepping movement mechanism includes a synchronous belt transmission mechanism that can move along the X direction and a screw transmission mechanism that can move along the Y and Z directions respectively.

[0018] Advantages of the present invention: When the anti-vibration special-shaped flexible material cutting device of the present invention is in use, each driving electromagnet on the driving plate is activated, generating a magnetic force that couples with each moving magnet on the tool shaft, thereby driving the tool shaft to rotate around its axis and driving the blade to rotate to cut the material. When the blade experiences non-periodic impacts due to differences in toughness, strength, hardness, density, etc. of the material being cut, the radial runout of the tool shaft gradually disappears due to the cancellation of the repulsive force between the fixed outer magnetic ring and the fixed inner magnetic ring. Moreover, the greater the impact received, the greater the repulsive force between the inner and outer magnetic rings, achieving the purpose of self-adaptive anti-impact load and ensuring the anti-impact performance of the blade. The axial vibration of the tool shaft is detected by the electrodynamic displacement sensor and the vibration information is transmitted to the controller in real time. The controller converts it into the frequency domain through Fourier transform and analyzes its frequency, amplitude, and phase, and then converts it into corresponding control signals and transmits them to the voice coil motor. The motor drive block of the voice coil motor drives the voice coil mover to move in real time in the opposite direction to the tool shaft, and the voice coil mover is fixed to the tool shaft to cancel the vibration of the tool shaft, achieving the active elimination of the axial vibration of the tool. Furthermore, when the tool shaft deviates from the center position due to non-periodic impacts, since its driving method is driven by a driving electromagnet, even if it deviates from the center position, it is still driven by the driving electromagnet, ensuring the relative stability of the drive, that is, effective drive can still be carried out under the conditions of large impact, large deformation, and axis deviation. In addition, after the stepping movement mechanism is started, it can drive the blade to move freely along the X, Y, and Z directions according to the set program. The cutting direction of the blade can be changed through the tool rotating mechanism. When the stepping movement mechanism drives the blade to move, a large motion acceleration is generated during the acceleration and deceleration process, or when the tool is subjected to non-periodic random impacts due to cutting special-shaped flexible materials with different toughness, different strength, different thickness, and different hardness, the damping device can automatically play a role, and the springs with different damping coefficients are used to eliminate the vibration in the X, Y, and Z directions. Since the cutting tool itself operates in the low-frequency region during the cutting operation, most of the high-frequency vibrations received are noise. By setting an appropriate transfer function through the spring suspension system, vibration noise suppression is achieved, and low-pass filtering of the mechanism is realized, ensuring the stability of the tool during high-speed operation, and realizing the isolation between the large-inertia motion mechanism and the small-inertia tool end, which is beneficial to achieving high-stability processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of a specific embodiment of the anti-vibration special-shaped flexible material cutting device of the present invention;

[0020] Figure 2 is a three-dimensional structure diagram of the tool rotating mechanism and its driving, detection, etc. parts;

[0021] Figure 3 is Figure 2 front view of

[0022] Figure 4 is Figure 2 the right view of;

[0023] Figure 5 is Figure 3 the sectional view taken along line A - A in;

[0024] Figure 6 is Figure 4 the sectional view taken along line B - B in;

[0025] In the figure: 1 - frame, 2 - stepping movement mechanism, 21 - X - direction synchronous belt drive mechanism, 22 - Y - direction lead screw drive mechanism, 23 - Z - direction lead screw drive mechanism, 231 - output slider (i.e., the output end); 3 - rotating tool mechanism, 31 - bracket, 32 - connecting shaft, 33 - driving motor, 34 - driving synchronous pulley, 35 - synchronous belt, 36 - driven synchronous pulley, 4 - tool rest, 41 - rectangular block, 42 - U - shaped frame, 421 - side plate, 5 - blade, 6 - voice coil motor, 61 - motor driving block, 62 - voice coil mover, 7 - special - shaped flexible material to be cut, 8 - flexible cutting panel, 9 - capacitive displacement sensor, 10 - driving board, 30 - driving electromagnet, 40 - mover magnet, 50 - tool shaft, 60 - fixed outer magnetic ring, 70 - fixed inner magnetic ring. Specific embodiments

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0028] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0029] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0030] An implementation manner of a jitter-proof special-shaped flexible material cutting device of the present invention: As Figures 1-6 shown, the jitter-proof special-shaped flexible material cutting device includes a frame 1, a stepping movement mechanism 2, a rotary knife mechanism 3, a tool holder 4, a tool shaft 50, a blade 5, a voice coil motor 6, a capacitive displacement sensor 9, a drive board 10, a controller, etc.

[0031] The frame 1 is a rectangular frame structure. The stepping moving mechanism 2 is installed on the frame 1, including an output end that can move in three directions of X, Y, and Z that are perpendicular to each other; the rotary knife mechanism 3 is suspended on the output end, including a bracket 31 and a connecting shaft 32 rotatably assembled on the bracket 31, the axis of the connecting shaft 32 is vertically arranged, and a rotary knife driving mechanism for driving the connecting shaft 32 to rotate around its axis is also installed on the bracket 31; the knife holder 4 is installed at the lower part of the connecting shaft 32, including a rectangular block 41 and a U-shaped frame 42 arranged at the lower part of the rectangular block 41, The U-shaped frame 42 includes two side plates 421 arranged in parallel at intervals, and the two side plates 421 of the U-shaped frame 42 are respectively provided with mounting through holes, and the two mounting through holes are coaxially arranged, and a fixed outer magnetic ring 60 is installed in the mounting through holes; a blade 5 is installed in the middle of the knife shaft 50, and the knife shaft 50 is inserted into the mounting through hole and the driving hole, and a fixed inner magnetic ring 70 is sleeved on the knife shaft 50 in a one-to-one correspondence with the fixed outer magnetic ring 60, and the fixed inner magnetic ring 70 and the fixed outer magnetic ring 60 are arranged with opposite polarities to repel each other; the voice coil The motor 6 includes a cylindrical motor drive block 61 and a cylindrical voice coil mover 62 driven by the motor drive block 61. The motor drive block 61 is sleeved outside the voice coil mover 62 and fixed relative to one side plate 421 of the U-shaped frame 42. The voice coil mover 62 is sleeved and fixed on the blade shaft 50. The capacitive displacement sensor 9 is used to detect the axial displacement of the blade 5. It is cylindrical, sleeved on the blade shaft 50 and fixed relative to the other side plate 421 of the U-shaped frame 42. The drive plate 10 has two pieces, which are respectively attached to On the outside of the two side plates 421, two driving plates 10 are respectively provided with driving holes, the two driving holes are coaxially arranged with the mounting through hole, and a plurality of driving electromagnets 30 are evenly distributed on the inner circumference of the driving holes; a mover magnet 40 is arranged on the blade shaft 50 corresponding to each driving electromagnet 30 in the two driving holes, and the mover magnet 40 is driven to rotate after the driving electromagnet 30 is energized; the controller is used to control the voice coil motor 6 to provide a reverse displacement according to the axial displacement signal of the blade 5 fed back by the capacitive displacement sensor 9.

[0032] The driving hole is a hexagonal hole, and one driving electromagnet 30 is respectively arranged on the six sides of the driving hole. The cross-sections of the two sections of the knife shaft 50 corresponding to the two driving holes are hexagonal, and one movable magnet 40 is respectively arranged on the six sides of the hexagon. The rotary knife driving mechanism includes a driving motor 33, a driving synchronous pulley 34, a synchronous belt and a driven synchronous pulley 36 which are sequentially connected in transmission, and the driven synchronous pulley 36 is fixed on the connecting shaft 32. The stepping moving mechanism 2 includes a synchronous belt transmission mechanism that can move along the X direction and a screw transmission mechanism that can move along the Y and Z directions respectively.

[0033] When the anti-vibration special-shaped flexible material cutting device of the present invention is in use, each driving electromagnet 30 on the driving plate 10 is activated, generating a magnetic force that couples with each mover magnet 40 on the tool shaft 50, thereby driving the tool shaft 50 to rotate around its axis, driving the blade 5 to rotate to cut the material. When the blade 5 is subjected to non-periodic impacts due to differences in toughness, strength, hardness, density, etc. of the material being cut, the radial runout of the tool shaft 50 gradually disappears due to the cancellation of the repulsive force between the fixed outer magnetic ring 60 and the fixed inner magnetic ring 70. Moreover, the greater the impact received, the greater the repulsive force between the inner and outer magnetic rings, achieving the purpose of self-adaptive anti-impact load and ensuring the anti-impact performance of the blade 5. The axial jitter of the tool shaft 50 is detected by the electrodynamic displacement sensor and the jitter information is transmitted to the controller in real time. The controller converts it into the frequency domain through Fourier transform and analyzes its frequency, amplitude, and phase, and then converts it into corresponding control signals and transmits them to the voice coil motor 6. The motor drive block 61 of the voice coil motor 6 drives the voice coil mover 62 to move in real time in the opposite direction to the tool shaft 50. The voice coil mover 62 is fixed to the tool shaft 50 to cancel the jitter of the tool shaft 50, achieving the active elimination of the axial jitter of the tool. Furthermore, when the tool shaft 50 deviates from the center position due to non-periodic impacts, since its driving method is driven by the driving electromagnet 30, even if it deviates from the center position, it is still driven by the driving electromagnet 30, ensuring the relative stability of the drive, that is, effective drive can still be carried out under the conditions of large impact, large deformation, and axial deviation. In addition, after the stepping movement mechanism 2 is started, it can drive the blade 5 to freely move along the X, Y, and Z directions according to the set program. The cutting direction of the blade 5 can be changed by the tool rotating mechanism 3. When the stepping movement mechanism 2 drives the blade 5 to move, a large movement acceleration is generated during the acceleration and deceleration process, or when the tool is subjected to non-periodic random impacts due to cutting special-shaped flexible materials with different toughness, different strength, different thickness, and different hardness, the shock absorption device can automatically play a role, and the jitter in the X, Y, and Z directions is eliminated by springs with respectively determined damping coefficients. Since the cutting tool itself operates in the low-frequency region during the cutting operation, most of the high-frequency jitters received are noise. The appropriate transfer function is set through the spring suspension system to suppress the jitter noise, achieve low-pass filtering of the mechanism, ensure the stability of the tool during high-speed operation, and isolate the large-inertia movement mechanism from the small-inertia tool end, which is beneficial to achieving high-stability processing.

[0034] One end of the long-arm-shaped bracket 31 is fixed to the output slider 231 of the Z-direction screw drive mechanism. A driving motor 33 is fixed in the fixing hole near the fixed end, and its shaft is fixedly connected to the driving synchronous pulley 34, and is connected by a synchronous belt to the driven synchronous pulley 36 fixed to the outer end of the bracket 31 to transmit power.

[0035] The driven synchronous pulley 36 is fixedly connected to the connecting shaft 32 and coaxially connected to the through hole at the distal end of the bracket 31. The end face at the lower end of the connecting shaft 32 is fixed at the center of the upper part of the rectangular tool holder 4;

[0036] On the lower part of the tool holder 4, there are symmetrically distributed side plates 421 on both sides, and through holes coaxial in the Y direction, in which a fixed outer magnetic ring 60 is fixed. A fixed inner magnetic ring 70 is fixedly installed at the center of the two fixed outer magnetic rings 60 on both sides, with its polarity opposite to that of the fixed outer magnetic ring 60, and the fixed inner magnetic ring 70 is fixed on the tool shaft 50. A blade 5 is fixed at the center of the tool shaft 50. Therefore, the blade 5 and the fixed inner magnetic ring 70 are fixedly connected through the tool shaft 50, and its radial non-contact positioning is realized through the fixed outer magnetic ring 60, and the radial load-bearing presents a non-linear load. That is, the greater the impact on the blade 5, the stronger the dynamic bearing capacity of the blade 5 and the greater the movement resistance, ensuring the radial impact resistance.

[0037] Both ends of the cylindrical tool shaft 50 are hexagonal structures, and a circle of 6 mover magnets 40 is fixedly installed in a circumferential array on each side surface, which correspond one by one to the drive electromagnets 30 on the hexagonal surfaces fixedly installed in the corresponding hexagonal slots of the drive plate 10. When an alternating current is applied, the drive electromagnet 30 fixed on the drive plate 10 drives the tool shaft 50 to achieve non-contact rotational motion, and a certain redundancy of the center deviation of the motion axis is left, ensuring effective drive even in the case of large impact, large deformation, and axis deviation. The drive plate 10 is fixedly connected to the U-shaped frame 42.

[0038] At the symmetric inner ends of the symmetrically distributed side plates 421 on the lower part of the tool holder 4, a cylindrical motor drive block 61 is fixedly installed, and the cylindrical motor drive block 61 is coaxially installed and fixed with the through holes of the symmetrically distributed side plates 421 on the lower part of the tool holder 4; A cylindrical voice coil mover 62 is fixedly installed on the tool shaft 50 and is in coaxial clearance fit with the motor drive block 61. The voice coil mover 62 drives the tool shaft 50 and the blade 5 to achieve axial high-frequency micro-displacement through the drive motor 33 drive block.

[0039] At the symmetric inner ends of the symmetrically distributed side plates 421 on the lower part of the tool holder 4, a cylindrical capacitive displacement gauge (i.e., capacitive displacement sensor 9) is fixedly installed, and the jitter frequency and amplitude of the blade 5 are detected by measuring the distance from the capacitive displacement gauge to the side surface of the blade 5.

[0040] The displacement detection vibration suppression cutting module adopted in the present invention realizes vibration suppression by: measuring the distance between it and the side surface of the blade 5 through the capacitive displacement gauge, real-time measuring the information of the tool jitter during the tool operation jitter, converting it into the frequency domain through Fourier transform and analyzing its frequency, amplitude, and phase, and then applying a corresponding signal to the motor drive block 61 to cancel the tool jitter.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention shall be subject to the claims. Any equivalent structural changes made by using the content of the specification and drawings of the present invention shall, by the same token, be included within the protection scope of the present invention.

Claims

1. An anti-shake special-shaped flexible material cutting device, characterized in that include: frame; The stepping moving mechanism is mounted on the frame and includes an output end that can move in three mutually perpendicular directions: X, Y, and Z; The rotary cutter mechanism is suspended on the output end and comprises a bracket and a connecting shaft rotatably mounted on the bracket, the axis of the connecting shaft is vertically arranged, and a rotary cutter driving mechanism for driving the connecting shaft to rotate around its axis is also mounted on the bracket; The tool holder is installed at the lower part of the connecting shaft, and includes a rectangular block and a U-shaped frame arranged at the lower part of the rectangular block. The U-shaped frame includes two side plates arranged in parallel at an interval. The two side plates of the U-shaped frame are respectively provided with mounting through holes. The two mounting through holes are coaxially arranged, and a fixed external magnetic ring is installed in the mounting through hole. A knife shaft, a blade is installed in the middle, the knife shaft is inserted into the installation through hole and the drive hole, and a fixed inner magnetic ring is sleeved on the knife shaft in one-to-one correspondence with the fixed outer magnetic ring, and the fixed inner magnetic ring and the fixed outer magnetic ring are arranged with opposite polarities to repel each other; The voice coil motor comprises a cylindrical motor drive block and a cylindrical voice coil mover driven by the motor drive block, wherein the motor drive block is sleeved outside the voice coil mover and fixed relative to a side plate of the U-shaped frame, and the voice coil mover is sleeved and fixed on the blade shaft; The capacitive displacement sensor is used to detect the axial displacement of the blade, is cylindrical, is sleeved on the blade shaft and is fixed relative to the other side plate of the U-shaped frame; There are two drive plates, which are respectively attached to the outside of the two side plates. The two drive plates are respectively provided with drive holes, which are coaxially arranged with the mounting through hole, and a plurality of drive electromagnets are evenly distributed on the inner circumference of the drive holes; a mover magnet is arranged on the knife shaft corresponding to each drive electromagnet in the two drive holes, and the mover magnet is driven to rotate after the drive electromagnet is energized; The controller is used to control the voice coil motor to provide a reverse displacement according to the blade axial displacement signal fed back by the capacitive displacement sensor.

2. The anti-shake special-shaped flexible material cutting device according to claim 1, wherein The driving hole is a hexagonal hole, and a driving electromagnet is respectively arranged on the six sides of the driving hole. The cross-sections of the two sections on the knife shaft corresponding to the two driving holes are hexagonal, and a mover magnet is respectively arranged on the six sides of the hexagon.

3. The anti-shake special-shaped flexible material cutting device according to claim 1, wherein The rotary cutter driving mechanism comprises a driving motor, a driving synchronous belt wheel, a synchronous belt and a driven synchronous belt wheel which are sequentially connected in transmission, and the driven synchronous belt wheel is fixed on the connecting shaft.

4. The anti-shake special-shaped flexible material cutting device according to claim 1, characterized in that, The stepping moving mechanism comprises a synchronous belt transmission mechanism which can move along the X direction and a screw transmission mechanism which can move along the Y and Z directions respectively.

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