Three-motor-driven facing head numerical control reducing system based on machine tool accessories

Abstract

The invention relates to the technical field of machine tool machining instruments, in particular to a three-motor-driven facing head numerical control reducing system based on machine tool accessories, and the system comprises a motor driving module which is used for driving each motor; the data acquisition module is used for acquiring operation data of the motor in real time; the intelligent control module is used for intelligently controlling the machining process according to the motor operation data; the position feedback module is used for monitoring the position of the cutter in the machining process in real time according to the motor operation data; and the vibration reduction module is used for judging the validity of the motor operation data according to the processing vibration frequency in the motor operation data, controlling a vibration reduction device according to a judgment result, and updating the motor operation data. The operation stability and the power performance of the facing head are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool processing equipment, and particularly relates to a three-motor-driven NC variable-diameter faceplate system based on machine tool accessories. Background Art

[0002] In the field of machine tool processing, a faceplate is a commonly used machine tool accessory for expanding the processing range and functions of a machine tool. However, traditional faceplate drive methods usually adopt single-motor or dual-motor drive. When facing complex processing tasks and high-precision requirements, this drive method often fails to provide sufficient power and precision. Due to uneven power distribution, it is easy to cause unstable operation of the faceplate, affecting processing quality and efficiency. In terms of NC variable diameter, the existing systems have a slow response speed and cannot quickly adjust the diameter of the faceplate according to processing requirements in a timely manner. This not only increases processing time but also may lead to the generation of processing errors. In addition, the control precision of traditional systems is low, and it is difficult to achieve precise adjustment of small sizes.

[0003] Chinese Patent Publication No.: CN108381264A discloses a high-precision double-head faceplate, including a machine tool body. A first groove is axially opened in the middle of the top surface of the machine tool body; a second groove is radially opened in the middle of the top surface thereof; a Z-axis driving member and a Z-axis sliding member are respectively fixed on both sides inside the first groove; a spindle box is fixed on the top surfaces of the Z-axis driving member and the Z-axis sliding member; a lifting workbench is fixed in the middle of the top surface of the machine tool body; a work fixture for clamping a workpiece is fixed on the top surface of the lifting workbench; the spindle of the spindle box is installed with the faceplate; a tool is fixed on the carriage of the faceplate; the faceplate includes a disc body; an X-axis transmission assembly is installed inside the disc body; the X-axis transmission assembly includes a fixed part and a rotating part movably installed inside the fixed part. However, in this invention, due to uneven power distribution, it is easy to cause unstable operation of the faceplate, affecting processing quality and efficiency. Summary of the Invention

[0004] Therefore, the present invention provides a three-motor-driven NC variable-diameter faceplate system based on machine tool accessories to overcome the problems of poor running stability and power performance of the faceplate in the prior art.

[0005] To achieve the above object, the present invention provides a three-motor-driven NC variable-diameter faceplate system based on machine tool accessories, and the system includes:

[0006] A motor drive module for driving each motor;

[0007] A data acquisition module for real-time acquisition of motor operation data;

[0008] An intelligent control module for intelligently controlling the processing process according to the motor operation data;

[0009] A position feedback module for real-time monitoring of the position of the cutting tool during machining based on the motor operation data;

[0010] A vibration damping module for judging the validity of the motor operation data according to the machining vibration frequency in the motor operation data, controlling the vibration damping device according to the judgment result, and updating the motor operation data.

[0011] Furthermore, the intelligent control module calculates the torque of the motor according to the torque constant and armature current of the motor, where:

[0012] Tz = Kt1 × I1, Tx = Kt2 × I2, Ty = Kt3 × I3;

[0013] Tz is the torque of the first motor, Tx is the torque of the second motor, Ty is the torque of the third motor, Kt1 is the torque constant of the first motor, Kt2 is the torque constant of the second motor, Kt3 is the torque constant of the third motor; I1 is the armature current of the first motor, I2 is the armature current of the second motor, I3 is the armature current of the third motor;

[0014] The intelligent control module also calculates the cutting force F1 of the first motor according to the lead pz of the ball screw of the first motor, the torque constant Kt1 of the first motor and the armature current Iz of the first motor, calculates the cutting force F2 of the second motor according to the lead px of the ball screw of the second motor, the torque constant Kt2 of the second motor and the armature current Ix of the second motor, and calculates the cutting force F3 of the third motor according to the lead py of the ball screw of the third motor, the torque constant Kt3 of the third motor and the armature current Iy of the third motor, where:

[0015]

[0016] Furthermore, the intelligent control module also compares the material strength Q with the preset material strength Q0, judges the applicability of the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor according to the comparison result, and adjusts the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor according to the judgment result, where:

[0017] When Q ≤ Q0, it is determined that the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor are applicable, and the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor are not adjusted;

[0018] When Q > Q0, it is determined that the cutting forces F1 of the first motor, F2 of the second motor, and F3 of the third motor are not applicable. Adjust the cutting forces F1 of the first motor, F2 of the second motor, and F3 of the third motor. Set the cutting force of the first motor after adjustment as F1`, F1` = Q 1.3 *F1, the cutting force of the second motor is F2`, F2` = Q 1.3 *F2, the cutting force of the third motor is F3`, F3` = Q 1.3 *F3.

[0019] Furthermore, the intelligent control module compares the motor processing temperature W with the preset motor processing temperature W0, judges the effectiveness of the material strength Q according to the comparison result, and makes real-time correction to the material strength Q according to the judgment result, where:

[0020] When W ≤ W0, it is determined that the material strength Q is effective and no correction is made to the material strength Q;

[0021] When W > W0, it is determined that the material strength Q is invalid and the material strength Q is corrected. Set the corrected material strength as Q`, Q` = (1 - β * e (W-W0) ) * Q, where β is the material temperature coefficient.

[0022] Furthermore, the intelligent control module compares the motor running time T with the preset motor running time T0, judges the effectiveness of the motor processing temperature W according to the comparison result, and updates the motor processing temperature W according to the judgment result, where:

[0023] When T ≤ T0, it is determined that the motor processing temperature W is effective and no update is made to the motor processing temperature W;

[0024] When T > T0, it is determined that the motor processing temperature W is invalid and the motor processing temperature W is updated. Set the updated motor processing temperature as W`, W` = (T - T0) 0.77 +W.

[0025] Furthermore, the position feedback module calculates the displacement △Y of the tool in the Y-axis direction and the displacement △X of the tool in the X-axis direction, and sets:

[0026]

[0027] Among them, F3 is the cutting force of the third motor, F2 is the cutting force of the second motor, L is the effective length of the tool, E is the elastic modulus of the tool, I is the moment of inertia of the tool cross-section, and A is the cross-sectional area of the tool;

[0028] The position feedback module also calculates the tool torque Tg, the tool twist angle φ, the torsional displacement ΔZ1 of the tool tip in the tangential direction, the displacement ΔZ2 of the tool, and the total displacement ΔZ of the tool in the Z-axis direction, and sets:

[0029] ΔZ = ΔZ1 + ΔZ2;

[0030] where r is the radius of the tool cross-section, F1 is the cutting force of the first motor, L is the effective length of the tool, G is the shear modulus of the material, and J is the polar moment of inertia.

[0031] Further, the position feedback module calculates the total displacement vector ΔS of the tool in space according to the displacement ΔY of the tool in the Y-axis direction, the displacement ΔX of the tool in the X-axis direction, and the total displacement ΔZ of the tool in the Z-axis direction, and sets, where is the unit vector in the X-axis direction, is the unit vector in the Y-axis direction, is the unit vector in the Z-axis direction.

[0032] Further, the position feedback module compares the machining error C with the preset machining error C0, judges the validity of the total displacement vector ΔS of the tool in space according to the comparison result, and corrects the total displacement vector ΔS of the tool in space according to the judgment result, where:

[0033] When C ≤ C0, it is determined that the total displacement vector ΔS of the tool in space is valid, and the total displacement vector ΔS of the tool in space is not corrected;

[0034] When C > C0, it is determined that the total displacement vector ΔS of the tool in space is invalid, and the total displacement vector ΔS of the tool in space is corrected. It is set that the total displacement vector of the corrected tool in space is ΔS`, ΔS` = α * ΔS, α is the machining error coefficient, α = (C - C0) / C0, and α ≤ 1.57.

[0035] Further, the position feedback module also compares the tool wear value M with the preset first tool wear value M1 and the preset second tool wear value M2, judges the tool wear degree and the validity of the machining error C according to the comparison result, and corrects the machining error C according to the judgment result, where:

[0036] When 0 ≤ M ≤ M1, it is determined that the tool wear degree is low wear, the machining error C is valid, and the machining error C is not corrected;

[0037] When M1 < M ≤ M2, it is determined that the tool wear degree is medium wear, the machining error C is invalid, the machining error C is corrected, and the corrected machining error is set as C`, C` = 0.77 + e 0.1×(M-M0)+15 *C;

[0038] When M2 < M, it is determined that the tool wear degree is high wear, the machining error C is invalid, and the tool is replaced.

[0039] Further, the vibration damping module compares the machining vibration frequency B with the preset machining vibration frequency B0, judges the validity of the motor operation data according to the comparison result, and outputs according to the judgment result, where:

[0040] When B ≤ B0, it is determined that the motor operation data is valid, the vibration damping device is not controlled, and the motor operation data is not updated;

[0041] When B > B0, it is determined that the motor operation data is invalid, the vibration damping device is controlled to operate, and the motor operation data is updated after the vibration damping device operates.

[0042] Compared with the prior art, the beneficial effects of the present invention are that the system provides power guarantee for the efficient operation of the system through the motor drive module, the system collects the motor operation data in real time through the data acquisition module to ensure the accuracy and reliability of the data, the system conducts intelligent control on the machining process through the intelligent control module to achieve precise control of the tool position, improve the machining accuracy and efficiency. At the same time, the intelligent control module can also adjust the control parameters in real time according to the changes in the machining process to ensure the stability and reliability of the machining process. The system monitors the position of the tool in the machining process in real time through the position feedback module and conducts feedback to achieve closed-loop control of the tool position and further improve the machining accuracy. The system judges the validity of the motor operation data through the vibration damping module and controls the vibration damping device according to the judgment result to reduce the vibration amplitude in the machining process, improve the machining quality and stability. At the same time, the vibration damping module can also update the motor operation data to further ensure the accuracy and reliability of the data. Description of the Drawings

[0043] Figure 1 It is a schematic structural diagram of a three-motor-driven faceplate numerical control variable diameter system based on machine tool accessories in this embodiment. Detailed Embodiment

[0044] In order to make the purpose and advantages of the present invention clearer, the present invention will be further described below in conjunction with 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.

[0045] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0046] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] Please refer to Figure 1 as shown in the figure, which is a schematic structural diagram of a three-motor-driven NC variable-diameter system for a machine tool accessory according to this embodiment. The system includes:

[0048] A motor drive module for driving each motor;

[0049] A data acquisition module for real-time acquisition of motor operation data. The data acquisition module is connected to the motor drive module;

[0050] An intelligent control module for intelligently controlling the machining process according to the motor operation data. The intelligent control module is connected to the data acquisition module;

[0051] A position feedback module for real-time monitoring of the position of the tool during the machining process according to the motor operation data. The position feedback module is connected to the intelligent control module;

[0052] A vibration damping module for judging the validity of the motor operation data according to the machining vibration frequency in the motor operation data, controlling the vibration damping device according to the judgment result, and updating the motor operation data. The vibration damping module is connected to the position feedback module.

[0053] Specifically, the system is applied to a three - electrode driven faceplate in machine tool accessories. Through an intelligent control method, the system realizes the uniform distribution and efficient output of power, thereby improving the running stability and power performance of the faceplate. In particular, the system provides power guarantee for the efficient operation of the system through the motor drive module. The system collects the motor operation data in real time through the data acquisition module to ensure the accuracy and reliability of the data. The system conducts intelligent control over the machining process through the intelligent control module to achieve precise control of the tool position, improve machining accuracy and efficiency. At the same time, the intelligent control module can also adjust the control parameters in real time according to the changes during the machining process to ensure the stability and reliability of the machining process. The system monitors the position of the tool in the machining process in real time through the position feedback module and conducts feedback to achieve closed - loop control of the tool position and further improve machining accuracy. The system judges the effectiveness of the motor operation data through the vibration damping module and controls the vibration damping device according to the judgment result to reduce the vibration amplitude during the machining process, improve machining quality and stability. At the same time, the vibration damping module can also update the motor operation data to further ensure the accuracy and reliability of the data.

[0054] Specifically, the motor drive module includes a first motor, a second motor, and a third motor, where:

[0055] The first motor is used to provide a power source for the main rotation movement of the faceplate;

[0056] The second motor and the third motor are used to perform a diameter - changing operation on the faceplate, and the relationship between the height h2 of the second motor and the height h3 of the third motor is h2 = h3;

[0057] When the faceplate needs to increase the radius, the second and third motors rotate forward synchronously;

[0058] When the faceplate needs to decrease the radius, the second and third motors rotate reversely synchronously.

[0059] Specifically, the data acquisition module collects the motor operation data in real time. The motor operation data includes: motor machining temperature, machining vibration frequency, armature current, tool position, size of the material after machining, tool wear degree, cutting force of the first motor, cutting force of the second motor, cutting force of the third motor, material strength, material properties, motor operation time, lead of the ball screw, and torque constant of the motor.

[0060] Specifically, the real - time acquisition method of the motor operation data is not limited in this embodiment. Those skilled in the relevant art can freely set it according to actual needs, as long as it meets the requirement of collecting the motor operation data in real time. For example, it can be set to collect the motor operation data in real time through a sensor matrix.

[0061] Specifically, the intelligent control module calculates the torque of the motor according to the torque constant and armature current of the motor, where:

[0062] Tz = Kt1 × I1, Tx = Kt2 × I2, Ty = Kt3 × I3;

[0063] Tz is the torque of the first motor, Tx is the torque of the second motor, Ty is the torque of the third motor, Kt1 is the torque constant of the first motor, Kt2 is the torque constant of the second motor, Kt3 is the torque constant of the third motor; I1 is the armature current of the first motor, I2 is the armature current of the second motor, I3 is the armature current of the third motor;

[0064] The intelligent control module also calculates the cutting force F1 of the first motor according to the lead pz of the ball screw of the first motor, the torque constant Kt1 of the first motor and the armature current Iz of the first motor, calculates the cutting force F2 of the second motor according to the lead px of the ball screw of the second motor, the torque constant Kt2 of the second motor and the armature current Ix of the second motor, and calculates the cutting force F3 of the third motor according to the lead py of the ball screw of the third motor, the torque constant Kt3 of the third motor and the armature current Iy of the third motor, where:

[0065]

[0066] The intelligent control module also compares the material strength Q with the preset material strength Q0, judges the applicability of the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor according to the comparison result, and adjusts the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor according to the judgment result, where:

[0067] When Q ≤ Q0, it is determined that the cutting forces F1 of the first motor, F2 of the second motor and F3 of the third motor are applicable, and the cutting forces F1 of the first motor, F2 of the second motor and F3 of the third motor are not adjusted;

[0068] When Q > Q0, it is determined that the applicability of the cutting forces F1 of the first motor, F2 of the second motor and F3 of the third motor is not applicable, and the cutting forces F1 of the first motor, F2 of the second motor and F3 of the third motor are adjusted. It is set that the cutting force of the first motor after adjustment is F1`, F1` = Q 1.3 *F1, the cutting force of the second motor is F2`, F2` = Q 1.3 *F2, the cutting force of the third motor is F3`, F3` = Q 1.3 *F3;

[0069] The intelligent control module compares the motor processing temperature W with the preset motor processing temperature W0, judges the validity of the material strength Q according to the comparison result, and makes real-time correction to the material strength Q according to the judgment result, where:

[0070] When W ≤ W0, it is determined that the material strength Q is valid, and no correction is made to the material strength Q;

[0071] When W > W0, it is determined that the material strength Q is invalid, and the material strength Q is corrected. The corrected material strength is set as Q`, and Q` = (1 - β * e (W-W0) ) * Q, where β is the material temperature coefficient;

[0072] The intelligent control module compares the motor running time T with the preset motor running time T0, judges the validity of the motor processing temperature W according to the comparison result, and updates the motor processing temperature W according to the judgment result, where:

[0073] When T ≤ T0, it is determined that the motor processing temperature W is valid, and no update is made to the motor processing temperature W;

[0074] When T > T0, it is determined that the motor processing temperature W is invalid, and the motor processing temperature W is updated. The updated motor processing temperature is set as W`, and W` = (T - T0) 0.77 + W.

[0075] Specifically, the position feedback module calculates the displacement △Y of the tool in the Y-axis direction and the displacement △X of the tool in the X-axis direction, and sets:

[0076]

[0077] where F3 is the cutting force of the third motor, F2 is the cutting force of the second motor, L is the effective length of the tool, E is the elastic modulus of the tool, I is the moment of inertia of the tool cross-section, and A is the cross-sectional area of the tool;

[0078] The position feedback module also calculates the tool torque Tg, the tool twist angle φ, the torsional displacement △Z1 of the tool end point in the tangential direction, the displacement △Z2 of the tool, and the total displacement △Z of the tool in the Z-axis direction, and sets:

[0079] △Z = △Z1 + △Z2;

[0080] where r is the radius of the tool cross-section, F1 is the cutting force of the first motor, L is the effective length of the tool, G is the shear modulus of the material, and J is the polar moment of inertia;

[0081] The position feedback module calculates and sets the total displacement vector ΔS of the tool in space based on the displacement ΔY of the tool in the Y-axis direction, the displacement ΔX of the tool in the X-axis direction, and the total displacement ΔZ of the tool in the Z-axis direction, where is the unit vector in the X-axis direction, is the unit vector in the Y-axis direction, is the unit vector in the Z-axis direction;

[0082] The position feedback module compares the machining error C with the preset machining error C0, judges the validity of the total displacement vector ΔS of the tool in space according to the comparison result, and corrects the total displacement vector ΔS of the tool in space according to the judgment result, where:

[0083] When C ≤ C0, it is determined that the total displacement vector ΔS of the tool in space is valid, and the total displacement vector ΔS of the tool in space is not corrected;

[0084] When C > C0, it is determined that the total displacement vector ΔS of the tool in space is invalid, and the total displacement vector ΔS of the tool in space is corrected. It is set that the total displacement vector of the tool in space after correction is ΔS`, ΔS` = α * ΔS, α is the machining error coefficient, α = (C - C0) / C0, and α ≤ 1.57;

[0085] The position feedback module also compares the tool wear value M with the preset first tool wear value M1 and the preset second tool wear value M2, judges the tool wear degree and the validity of the machining error C according to the comparison result, and corrects the machining error C according to the judgment result, where:

[0086] When 0 ≤ M ≤ M1, it is determined that the tool wear degree is low wear, the machining error C is valid, and the machining error C is not corrected;

[0087] When M1 < M ≤ M2, it is determined that the tool wear degree is medium wear, the machining error C is invalid, and the machining error C is corrected. It is set that the corrected machining error is C`, C` = 0.77 + e 0.1×(M-M0)+15 *C;

[0088] When M2 < M, it is determined that the tool wear degree is high wear, the machining error C is invalid, and the tool is replaced.

[0089] Specifically, the vibration damping module compares the machining vibration frequency B with the preset machining vibration frequency B0, judges the validity of the motor operation data according to the comparison result, and outputs according to the judgment result, where:

[0090] When B ≤ B0, it is determined that the motor operation data is valid, the vibration damping device is not controlled, and the motor operation data is not updated.

[0091] When B > B0, it is determined that the motor operation data is invalid, the vibration damping device is controlled to operate, and the motor operation data is updated after the vibration damping device operates.

[0092] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A three-motor-driven NC variable-diameter system for a faceplate based on machine tool accessories, characterized in that, The system includes: A motor drive module for driving each motor; A data acquisition module for real-time acquisition of motor operation data; An intelligent control module for intelligent control of the processing process according to the motor operation data; A position feedback module for real-time monitoring of the position of the cutting tool during the processing process according to the motor operation data; A vibration damping module for judging the validity of the motor operation data according to the processing vibration frequency in the motor operation data, controlling the vibration damping device according to the judgment result, and updating the motor operation data.

2. The three-motor-driven NC variable-diameter faceplate system based on machine tool accessories according to claim 1, wherein The intelligent control module calculates the torque of the motor according to the torque constant and armature current of the motor, where: Tz = Kt1 × I1, Tx = Kt2 × I2, Ty = Kt3 × I3; Tz is the torque of the first motor, Tx is the torque of the second motor, Ty is the torque of the third motor, Kt1 is the torque constant of the first motor, Kt2 is the torque constant of the second motor, Kt3 is the torque constant of the third motor; I1 is the armature current of the first motor, I2 is the armature current of the second motor, I3 is the armature current of the third motor; The intelligent control module also calculates the cutting force F1 of the first motor according to the lead pz of the ball screw of the first motor, the torque constant Kt1 of the first motor and the armature current Iz of the first motor, calculates the cutting force F2 of the second motor according to the lead px of the ball screw of the second motor, the torque constant Kt2 of the second motor and the armature current Ix of the second motor, and calculates the cutting force F3 of the third motor according to the lead py of the ball screw of the third motor, the torque constant Kt3 of the third motor and the armature current Iy of the third motor, where:

3. The three-motor-driven NC variable-diameter faceplate system based on machine tool accessories according to claim 2, characterized in that, The intelligent control module also compares the material strength Q with the preset material strength Q0, judges the applicability of the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor according to the comparison result, and adjusts the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor according to the judgment result, where: When Q ≤ Q0, it is determined that the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor are applicable, and the cutting force F1 of the first motor, the cutting force F2 of the second motor and the cutting force F3 of the third motor are not adjusted; When Q > Q0, it is determined that the applicable situations of the cutting force F1 of the first motor, the cutting force F2 of the second motor, and the cutting force F3 of the third motor are not applicable, and the cutting force F1 of the first motor, the cutting force F2 of the second motor, and the cutting force F3 of the third motor are adjusted. It is set that the cutting force of the first motor after adjustment is F1`, and F1` = Q 1.3 *F1, the cutting force of the second motor is F2`, and F2` = Q 1.3 *F2, the cutting force of the third motor is F3`, and F3` = Q 1.3 *F3.

4. The three-motor-driven NC variable-diameter faceplate system based on machine tool accessories according to claim 3, characterized in that, The intelligent control module compares the motor processing temperature W with the preset motor processing temperature W0, judges the validity of the material strength Q according to the comparison result, and corrects the material strength Q in real time according to the judgment result, where: When W ≤ W0, it is determined that the material strength Q is valid, and the material strength Q is not corrected; When W > W0, it is determined that the material strength Q is invalid, and the material strength Q is corrected. Let the corrected material strength be Q`, and Q` = (1 - β * e (W-W0) ) * Q, where β is the material temperature coefficient.

5. The three-motor-driven NC variable-diameter faceplate system based on machine tool accessories according to claim 4, wherein The intelligent control module compares the motor operation time T with the preset motor operation time T0, judges the validity of the motor processing temperature W according to the comparison result, and updates the motor processing temperature W according to the judgment result, where: When T ≤ T0, it is determined that the motor processing temperature W is valid, and the motor processing temperature W is not updated; When T > T0, it is determined that the motor processing temperature W is invalid, and the motor processing temperature W is updated. Let the updated motor processing temperature be W`, and W` = (T - T0) 0.77 + W.

6. The three-motor-driven NC variable-diameter system for faceplate based on machine tool accessories according to claim 1, wherein The position feedback module calculates the displacement △Y of the tool in the Y-axis direction and the displacement △X of the tool in the X-axis direction, and sets: where F3 is the cutting force of the third motor, F2 is the cutting force of the second motor, L is the effective length of the tool, E is the elastic modulus of the tool, I is the moment of inertia of the tool cross-section, and A is the cross-sectional area of the tool; The position feedback module also calculates the tool torque Tg, the tool twist angle φ, the torsional displacement △Z1 of the tool end point in the tangential direction, the displacement △Z2 of the tool, and the total displacement △Z of the tool in the Z-axis direction, and sets: △Z2； where r is the radius of the tool cross-section, F1 is the cutting force of the first motor, L is the effective length of the tool, G is the shear modulus of the material, and J is the polar moment of inertia.

7. The three-motor-driven NC variable-diameter faceplate system based on machine tool accessories according to claim 6, wherein The position feedback module calculates and sets the total displacement vector ΔS of the tool in space based on the displacement ΔY of the tool in the Y-axis direction, the displacement ΔX of the tool in the X-axis direction, and the total displacement ΔZ of the tool in the Z-axis direction. where is the unit vector in the X-axis direction, is the unit vector in the Y-axis direction, is the unit vector in the Z-axis direction.

8. The three-motor-driven NC variable-diameter faceplate system based on machine tool accessories according to claim 7, characterized in that, The position feedback module compares the machining error C with the preset machining error C0, judges the validity of the total displacement vector △S of the tool in space according to the comparison result, and corrects the total displacement vector △S of the tool in space according to the judgment result, where: When C ≤ C0, it is determined that the total displacement vector △S of the tool in space is valid, and the total displacement vector △S of the tool in space is not corrected; When C > C0, it is determined that the total displacement vector △S of the tool in space is invalid, and the total displacement vector △S of the tool in space is corrected. It is set that the total displacement vector of the tool in space after correction is △S`, △S` = α * △S, α is the machining error coefficient, α = (C - C0) / C0, and α ≤ 1.

57.

9. The three-motor-driven NC variable-diameter system of a faceplate based on machine tool accessories according to claim 8, characterized in that, The position feedback module also compares the tool wear value M with the preset first tool wear value M1 and the preset second tool wear value M2, judges the tool wear degree and the validity of the machining error C according to the comparison result, and corrects the machining error C according to the judgment result, where: When 0 ≤ M ≤ M1, it is determined that the tool wear degree is low wear, the machining error C is valid, and the machining error C is not corrected; When M1 < M ≤ M2, it is determined that the tool wear degree is medium wear, the machining error C is invalid, the machining error C is corrected, and the corrected machining error is set as C`, C` = 0.77 + e 0.1×(M-M0)+15 *C; When M2 < M, it is determined that the tool wear degree is high wear, the machining error C is invalid, and the tool is replaced.

10. The three-motor-driven NC variable-diameter faceplate system based on machine tool accessories according to claim 1, characterized in that, The vibration damping module compares the machining vibration frequency B with the preset machining vibration frequency B0, judges the validity of the motor operation data according to the comparison result, and outputs according to the judgment result, where: When B ≤ B0, it is determined that the motor operation data is valid, the vibration damping device is not controlled, and the motor operation data is not updated; When B > B0, it is determined that the motor operation data is invalid, the vibration damping device is controlled to operate, and the motor operation data is updated after the vibration damping device operates.

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