A dynamic compensation device for numerical control wire cutting electric spark processing machine

Abstract

The present application belongs to the technical field of electric spark machining, especially to a dynamic compensation device for a numerical control wire cutting electric spark machining machine, comprising a rack, an upper beam plate, a lower beam plate, a side plate, a wire tensioner and a rolling wire tube, the wire tensioner comprising a fixed wheel, a moving wheel and an electric push rod, and the molybdenum wire sequentially passes through a guide wheel, an upper guide wheel, a lower guide wheel, the fixed wheel, the moving wheel and the rolling wire tube; additionally, the present application adds a pressure sensor, a displacement sensor and a controller on the basis of the mechanical structure to constitute a closed-loop control system, adopts a fuzzy PID algorithm to adjust the electric push rod to drive the moving wheel to move in real time, and realizes dynamic compensation of the electrode wire tension; further, the feedforward compensation module is used to suppress the tension peak caused by the acceleration and deceleration of the rolling wire tube, and the adaptive learning module is used to automatically optimize the optimal tension setting value under different working conditions by using a neural network. The present application can effectively solve the problems of large electrode wire tension fluctuation and easy wire breakage, and significantly improve the machining stability and machining quality.

Description

Technical Field

[0001] This invention relates to the field of electrical discharge machining technology, and in particular to a dynamic compensation device for CNC wire EDM machines. Background Technology

[0002] CNC wire electrical discharge machining (EDM) is an advanced technology that uses a continuously moving fine metal wire (called the electrode wire) as a tool electrode to generate high temperatures through pulsed spark discharge to erode metal materials and achieve part machining. This technology is widely used in mold manufacturing, precision machining, and other fields. In actual machining, the tension of the electrode wire is one of the key factors affecting machining accuracy, surface quality, and machining stability.

[0003] During prolonged high-speed operation, the electrode wire undergoes plastic elongation due to friction with components such as guide wheels and conductive blocks, as well as the high-temperature environment of the machining zone, leading to tension attenuation. When the tension is too low, the electrode wire vibrates more intensely within the machining gap, reducing machining accuracy and increasing the risk of short circuits and wire breakage. Conversely, excessive tension increases internal stress and reduces fatigue resistance, also increasing the risk of breakage. Therefore, accurately and in real-time adjusting and maintaining the optimal tension of the electrode wire during machining is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, this invention proposes a dynamic compensation device for CNC wire EDM machines.

[0005] This invention proposes a dynamic compensation device for a CNC wire EDM machine, comprising a frame, an upper beam plate, a lower beam plate, side plates, a wire tensioner, and a wire rolling drum. The side plates and the wire tensioner are located between the upper beam plate and the lower beam plate and are fixedly mounted on the frame, distributed vertically. The lower beam plate is parallel to and directly below the upper beam plate. The wire rolling drum is fixed to the side of the frame. Guide wheels are mounted on the side plates, and upper and lower guide wheels are respectively mounted on the upper and lower beam plates. The wire tensioner includes a fixed base, fixed wheels, movable wheels, and an electric push rod. The fixed base is fixed to the frame, two fixed wheels are mounted on the upper part of the fixed base, the movable wheels are slidably mounted on the middle part of the fixed base, and the electric push rod is mounted below the movable wheels, with its output shaft connected to the movable wheels. A molybdenum wire passes sequentially through the guide wheels, the upper guide wheels, the lower guide wheels, the fixed wheels and movable wheels on the wire tensioner, and the wire rolling drum.

[0006] Preferably, the upper beam plate and the lower beam plate are connected by a spacing adjustment mechanism, which includes a vertical rod, a fixed frame, a slider, a rack, a gear, and a handwheel. The two vertical rods are fixed together on the fixed frame, which is fixed to the front of the frame. The two sliders are respectively sleeved on the corresponding vertical rods, and the upper beam plate is fixed on both sliders. Each slider is also equipped with a clamp. The lower beam plate is fixed to the lower part of the vertical rod. The rack is fixed to the top of the fixed frame. The gear located between the two sliders and meshing with the rack is installed on the upper beam plate. The handwheel is installed at the front end of the gear.

[0007] Preferably, the tensioner further includes a pressure sensor and a displacement sensor. The pressure sensor is mounted on the sliding support of the moving wheel, and the electric actuator is a servo electric actuator with the displacement sensor built in. Both the pressure sensor and the displacement sensor are electrically connected to a controller.

[0008] Preferably, the controller integrates a tension setting module, a data acquisition module, a compensation calculation module, and a drive output module. The data acquisition module receives the actual tension value detected by the pressure sensor and the actual displacement value detected by the displacement sensor in real time. The compensation calculation module compares the actual tension value with the target tension value and outputs a control quantity to the drive output module using a fuzzy PID control algorithm. The drive output module drives the electric push rod to extend and retract to move the moving wheel, thereby realizing closed-loop dynamic compensation of tension.

[0009] Preferably, the controller further includes a feedforward compensation module, which is communicatively connected to the drive system of the thread rolling drum. The feedforward compensation module is used to acquire the rotational speed signal and acceleration / deceleration signal of the thread rolling drum in real time, and send a feedforward control signal to the drive output module in advance according to a preset feedforward model.

[0010] Preferably, the controller further includes an adaptive learning module, which is used to record the tension change curve, electric push rod response trajectory and wire breakage event data during the processing, and to establish a mapping model between processing parameters and optimal tension setpoint using a neural network-based machine learning algorithm, so as to automatically recommend target tension value.

[0011] Preferably, a guide rail is also installed on the fixed base, the movable wheel slides with the guide rail through a slider seat, and limit buffers are provided at both ends of the guide rail.

[0012] Preferably, shock dampers are installed on the upper beam plate and the lower beam plate respectively, and the shock dampers are connected to the wheel axles of the upper guide wheel and the lower guide wheel.

[0013] Preferably, the surface of the thread rolling cylinder is coated with a ceramic wear-resistant layer, and dynamic balance correction holes are provided at both ends of the thread rolling cylinder.

[0014] Preferably, a coolant nozzle is installed on the side plate, the spray direction of the coolant nozzle is toward the machining gap between the molybdenum wire and the workpiece, and the flow rate of the coolant nozzle is adjusted in real time by the controller according to the machining current.

[0015] Compared with the prior art, the present invention provides a dynamic compensation device for CNC wire EDM machines, which has the following beneficial effects: 1. A dynamic compensation device for CNC wire EDM machines, which can actively adjust the tension of the electrode wire by setting a wire tensioner and an electric push rod. Compared with the traditional passive tensioning method of hammer or spring, it has a faster response speed and a wider adjustment range, and can effectively avoid wire breakage caused by excessive or insufficient tension.

[0016] 2. A dynamic compensation device for a CNC wire EDM machine, which forms a closed-loop feedback control system by setting a pressure sensor, a displacement sensor and a controller, can monitor and precisely control the electrode wire tension in real time, so that the tension is always kept within the set optimal range.

[0017] 3. A dynamic compensation device for a CNC wire EDM machine, which, by setting a spacing adjustment mechanism, can conveniently adjust the vertical distance between the upper and lower guide wheels, thereby adapting to workpieces of different thicknesses, expanding the processing range of the equipment, and the adjustment process is precise and reliable.

[0018] 4. A dynamic compensation device for a CNC wire EDM machine, which adopts a fuzzy PID control algorithm to adaptively adjust control parameters according to the magnitude and trend of tension deviation, overcoming the shortcomings of traditional PID control that is prone to overshoot and oscillation in large-scale nonlinear and time-varying systems. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the spacing adjustment mechanism of the present invention. Figure 3 This is a schematic diagram of the rear structure of the spacing adjustment mechanism of the present invention; Figure 4 This is a schematic diagram of the tensioner structure of the present invention.

[0020] In the diagram: 1. Frame; 2. Upper beam plate; 21. Upper guide wheel; 3. Lower beam plate; 31. Lower guide wheel; 4. Side plate; 41. Guide wheel; 5. Wire tensioner; 51. Fixed seat; 52. Fixed wheel; 53. Moving wheel; 54. Electric push rod; 6. Wire rolling drum; 7. Spacing adjustment mechanism; 71. Vertical rod; 72. Fixed frame; 73. Slider; 74. Rack; 75. Gear; 76. Handwheel. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Reference Figures 1-4 A dynamic compensation device for a CNC wire EDM machine includes a frame 1, an upper beam plate 2, a lower beam plate 3, a side plate 4, a wire tensioner 5, and a wire rolling drum 6. The side plate 4 and the wire tensioner 5 are located between the upper beam plate 2 and the lower beam plate 3 and are fixed to the frame 1 in a vertically distributed manner. The lower beam plate 3 is arranged parallel to the upper beam plate 2 directly below it. The wire rolling drum 6 is fixed to the side of the frame 1. Guide wheels 41 are mounted on the side plate 4, and upper guide wheels 21 and lower guide wheels 31 are respectively mounted on the upper beam plate 2 and the lower beam plate 3. The wire tensioner 5 includes a fixed base 51, fixed wheels 52, movable wheels 53, and an electric push rod 54. The fixed base 51 is fixed to the frame 1. The two fixed wheels 52 are mounted on the upper part of the fixed base 51. The movable wheel 53 is slidably mounted on the middle part of the fixed base 51. The electric push rod 54 is mounted below the movable wheel 53, and its output shaft is connected to the movable wheel 53. The molybdenum wire passes sequentially through the guide wheel 41, the upper guide wheel 21, the lower guide wheel 31, the fixed wheel 52 and the moving wheel 53 on the tensioner 5, and the rolling drum 6. During operation, the rolling drum 6 is driven to rotate by the drive system on the rolling drum 6, thereby guiding the molybdenum wire to move. The tension of the molybdenum wire can be adjusted by the tensioner 5.

[0024] It should be noted that the dynamic balance and surface wear resistance of the thread rolling drum 6, as the power source driving the reciprocating motion of the electrode wire, are crucial. Therefore, in this embodiment, the surface of the thread rolling drum 6 is coated with a ceramic wear-resistant layer (such as an alumina or tungsten carbide coating). This coating has extremely high hardness and surface smoothness, which can significantly reduce frictional wear with the electrode wire and extend the service life of the thread rolling drum. Simultaneously, multiple dynamic balance correction holes are provided at both ends of the thread rolling drum 6. After manufacturing, high-precision dynamic balance correction is performed using a weight-reduction method to ensure that the residual imbalance reaches a level of G1.0 or higher, guaranteeing the stable operation of the thread rolling drum 6 at its highest speed and reducing the periodic interference of the electrode wire tension caused by the drum's own vibration.

[0025] As a preferred structure in this embodiment, the upper beam plate 2 and the lower beam plate 3 can be directly fixed to the frame 1, or as follows: Figures 1 to 3 As shown, the two are connected by a spacing adjustment mechanism 7, making the distance between the upper beam plate 2 and the lower beam plate 3 adjustable. The spacing adjustment mechanism 7 includes a vertical rod 71, a fixed frame 72, a slider 73, a rack 74, a gear 75, and a handwheel 76. The two vertical rods 71 ​​are fixed together on the fixed frame 72, which is fixed to the front of the frame 1. The two sliders 73 are respectively fitted onto the corresponding vertical rods 71, and the upper beam plate 2 is fixed to both sliders 73. Each slider 73 is also equipped with a clamp. The lower beam plate 3 is fixed to the lower part of the vertical rods 71. A rack 74 is fixed to the top of the fixed frame 72. A gear 75 located between the two sliders 73 and meshing with the rack 74 is installed on the upper beam plate 2. A handwheel 76 is installed at the front end of the gear 75. In practical use, the operator first loosens the clamp on the slider 73 according to the thickness of the workpiece to be processed, and then manually cranks the handwheel 76. The handwheel 76 drives the gear 75 to rotate, and the gear 75 meshes with the fixed rack 74, thereby driving the upper beam plate 2 and the two sliders 73 on it to slide up and down along the vertical rod 71. When the distance between the upper guide wheel 21 and the lower guide wheel 31 is adjusted to a suitable position, the clamp is re-locked to fix the position of the upper beam plate 2, thus adapting to the processing requirements of different workpieces from thin plates to thick plates.

[0026] To achieve real-time and precise control of the electrode wire tension, this embodiment further introduces an intelligent control scheme based on the mechanical structure. Specifically, the tensioner 5 also includes a pressure sensor mounted on the sliding support of the moving wheel 53, used to detect the molybdenum wire tension feedback force on the moving wheel 53 in real time. Simultaneously, the electric actuator 54 is a high-precision servo electric actuator with an integrated displacement sensor, used to detect the displacement of the moving wheel 53 in real time. Both the pressure sensor and the displacement sensor are electrically connected to a controller. The controller can be a programmable logic controller (PLC) or an ARM-based embedded microcontroller, integrating multiple functional modules, including a tension setting module, a data acquisition module, a compensation calculation module, and a drive output module.

[0027] The tension setting module receives user-input processing parameters or preset target tension values ​​F_target. These parameters can be input via a human-machine interface, for example, by looking up a table or empirical formula based on the workpiece material, thickness, and cutting accuracy requirements to set an initial optimal tension value. The data acquisition module receives, in real time, the actual tension value F_act detected by the pressure sensor and the actual displacement value D_act detected by the displacement sensor at a sampling frequency of no less than 100Hz.

[0028] The compensation calculation module compares the actual tension value F_act with the target tension value F_target to calculate the tension deviation value ΔF = F_target - F_act. Due to the nonlinear, time-varying, and hysteresis characteristics of the electrode wire tension control system, traditional fixed-parameter PID controllers struggle to maintain good control quality across all operating conditions. Therefore, this module incorporates a fuzzy PID control algorithm. This algorithm first fuzzifies the tension deviation value ΔF and its rate of change ΔF / Δt, mapping them to corresponding fuzzy domains and defining fuzzy subsets (such as negative large, negative medium, negative small, zero, positive small, positive medium, and positive large). Then, according to the preset fuzzy control rule table (e.g., when ΔF is positive and ΔF / Δt is positive, the proportional coefficient Kp and integral coefficient Ki should be increased significantly to quickly eliminate large deviations; when ΔF is negative and ΔF / Δt is negative, Kp and derivative coefficient Kd should be appropriately reduced to prevent overshoot), the PID control parameters (proportional coefficient Kp, integral coefficient Ki, derivative coefficient Kd) are dynamically adjusted through fuzzy inference and defuzzification operations. Finally, the compensation calculation module calculates the control quantity u(t) based on the adjusted PID parameters and outputs it to the drive output module. The drive output module converts this control quantity into a corresponding voltage or pulse signal, driving the electric push rod 54 to precisely extend and retract, thus moving the moving wheel 53. The change in the position of the moving wheel 53 changes the wrap angle of the molybdenum wire between the two fixed wheels 52 and the moving wheel 53, thereby changing the friction and tension force on the molybdenum wire, achieving closed-loop dynamic compensation for tension.

[0029] Furthermore, to address the severe tension shocks generated during the start-up, stop, and speed changes of the thread rolling drum 6, this intelligent control scheme also includes a feedforward compensation module. This module communicates with the drive system of the thread rolling drum 6 (typically a servo motor driver) via an industrial fieldbus (such as EtherCAT or CANopen) to acquire the speed and acceleration / deceleration signals of the thread rolling drum 6 in real time. When the module detects that the thread rolling drum 6 is about to start, stop, or accelerate / decelerate, it quickly calculates the required feedforward compensation amount based on a pre-established mathematical model that describes the quantitative relationship between the rate of change of the thread rolling drum speed and the inertial tension fluctuation of the electrode wire. This feedforward compensation amount is directly superimposed on the control signal of the drive output module without undergoing PID deviation adjustment, causing the electric actuator 54 to move a compensating displacement in the opposite direction before a significant tension fluctuation actually occurs, thereby eliminating tension spikes caused by the acceleration and deceleration of the thread rolling drum. This combined feedback and feedforward control structure significantly improves the system's anti-interference capability against sudden changes.

[0030] Furthermore, this intelligent control solution also possesses self-learning and adaptive optimization capabilities. To this end, an adaptive learning module is incorporated into the solution, which integrates a machine learning algorithm based on a backpropagation neural network. After each machining task, the adaptive learning module automatically records and stores key data from the machining process, including: user-set initial parameters (workpiece material, thickness, machining current, pulse width, thread rolling drum speed), the deviation curve between the tension setpoint and the actual value throughout the machining process, the displacement response trajectory of the electric push rod 54, and whether a wire breakage event occurred and the instantaneous operating conditions at the time of occurrence. Once a sufficient number of data samples have been accumulated, the module initiates offline training. The neural network uses the machining parameters as input layer nodes and the optimal tension setpoint as the output layer node. By continuously adjusting the connection weights between neurons, it gradually approximates the complex nonlinear mapping relationship between the machining parameters and the optimal tension value. After training, in subsequent machining tasks, when the user inputs the workpiece material and thickness through the human-machine interface, the adaptive learning module can automatically infer and recommend an optimal target tension value based on the current machining conditions and automatically send it to the tension setting module, eliminating the need for manual setting by the operator based on experience. This feature is particularly beneficial for processing new materials or for inexperienced operators, as it can significantly reduce wire breakage and improve the consistency of processing quality.

[0031] In addition, to improve the smoothness and safety of the movement of the movable wheel 53, a guide rail is installed on the fixed base 51, and the movable wheel 53 slides in contact with the guide rail via a slider seat. The guide rail is made of high-hardness chrome-plated linear guide rail, which has a low coefficient of friction and good wear resistance. Limit buffers are set at both ends of the guide rail. These buffers can be polyurethane rubber pads or miniature hydraulic buffers, used to limit the extreme stroke of the movable wheel 53 and prevent damage to the equipment caused by the movable wheel 53 hitting the end cover due to sensor failure or control abnormality.

[0032] In addition, to reduce the negative impact of mechanical vibration on tension stability from the source, anti-vibration dampers are installed on the upper beam plate 2 and the lower beam plate 3, respectively. These anti-vibration dampers can be viscous dampers or spring-friction dampers, with their housings fixed to the upper beam plate 2 and the lower beam plate 3, and their moving ends connected to the axles of the upper guide wheel 21 and the lower guide wheel 31. When the electrode wire runs at high speed, the high-frequency alternating force on the guide wheel is transmitted to the anti-vibration damper through the axle. The viscous fluid or friction pair inside the damper converts the vibration energy into heat energy and dissipates it, thereby effectively suppressing the radial runout and axial movement of the guide wheel, reducing the tension fluctuation of the electrode wire when passing through the guide wheel.

[0033] Finally, considering the indirect impact of cooling and chip removal on electrode wire tension, when chip removal is poor in the machining area, the accumulation of a large amount of electro-erosion products will hinder the movement of the electrode wire, generating additional resistance and causing abnormally high tension. Therefore, this device is equipped with a coolant nozzle on side plate 4. This coolant nozzle is connected to the liquid supply system via a solenoid valve, and its spray direction is precisely aligned with the machining gap between the molybdenum wire and the workpiece. The opening degree and flow rate of the solenoid valve are adjusted in real time by the controller based on the machining current: when an increase in machining current is detected (indicating increased discharge energy and the need for stronger cooling), the controller automatically increases the flow rate of the coolant nozzle; when there is a machining gap or no load, the flow rate is reduced to conserve coolant. Through this intelligent cooling flow rate adjustment, electro-erosion products in the machining gap can be effectively flushed away, improving chip removal conditions and thus avoiding additional tension fluctuations caused by poor chip removal, indirectly enhancing the overall effect of the dynamic compensation device.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dynamic compensation device for a CNC wire EDM machine, comprising a frame (1), an upper beam plate (2), a lower beam plate (3), a side plate (4), a wire tensioner (5), and a wire rolling drum (6), characterized in that, The side plate (4) and the wire tensioner (5) are located between the upper beam plate (2) and the lower beam plate (3) and are fixed on the frame (1) vertically. The lower beam plate (3) is arranged parallel to the upper beam plate (2) directly below it. The wire rolling drum (6) is fixed to the side of the frame (1). A guide wheel (41) is installed on the side plate (4), and an upper guide wheel (21) and a lower guide wheel (31) are installed on the upper beam plate (2) and the lower beam plate (3), respectively. The wire tensioner (5) includes a fixed base (51), a fixed wheel (52), a moving wheel (53), and an electric push rod (54). 54), the fixed seat (51) is fixed on the frame (1), the two fixed wheels (52) are installed on the upper part of the fixed seat (51), the movable wheel (53) is slidably installed on the middle part of the fixed seat (51), the electric push rod (54) is installed below the movable wheel (53), and its output shaft is connected to the movable wheel (53); the molybdenum wire passes through the guide wheel (41), the upper guide wheel (21), the lower guide wheel (31), the fixed wheel (52) and the movable wheel (53) on the wire tensioner (5) and the wire rolling drum (6) in sequence.

2. The dynamic compensation device for a CNC wire EDM machine according to claim 1, characterized in that, The upper beam plate (2) and the lower beam plate (3) are connected by a spacing adjustment mechanism (7), which includes a vertical rod (71), a fixed frame (72), a slider (73), a rack (74), a gear (75), and a handwheel (76). The two vertical rods (71) are fixed together on the fixed frame (72), which is fixed to the front of the frame (1). The two sliders (73) are respectively sleeved on the corresponding vertical rods (71). The upper beam plate (2) is fixed on both sliders (73), and each slider (73) is also equipped with a clamp. The lower beam plate (3) is fixed at the lower part of the vertical rod (71). The rack (74) is fixed on the top of the fixed frame (72). The gear (75) located between the two sliders (73) and meshing with the rack (74) is installed on the upper beam plate (2). The handwheel (76) is installed at the front end of the gear (75).

3. The dynamic compensation device for a CNC wire EDM machine according to claim 1, characterized in that, The tensioner (5) also includes a pressure sensor and a displacement sensor. The pressure sensor is mounted on the sliding support of the moving wheel (53). The electric push rod (54) is a servo electric push rod and has the displacement sensor built in. Both the pressure sensor and the displacement sensor are electrically connected to a controller.

4. The dynamic compensation device for a CNC wire EDM machine according to claim 3, characterized in that, The controller integrates a tension setting module, a data acquisition module, a compensation calculation module, and a drive output module; the data acquisition module receives in real time the actual tension value detected by the pressure sensor and the actual displacement value detected by the displacement sensor. The compensation calculation module compares the actual tension value with the target tension value and uses a fuzzy PID control algorithm to output a control quantity to the drive output module. The drive output module drives the electric push rod (54) to extend and retract to move the moving wheel (53) and realize tension closed-loop dynamic compensation.

5. A dynamic compensation device for a CNC wire EDM machine according to claim 4, characterized in that, The controller also includes a feedforward compensation module, which is communicatively connected to the drive system of the thread rolling drum (6) and is used to acquire the rotation speed signal and acceleration / deceleration signal of the thread rolling drum (6) in real time, and send a feedforward control signal to the drive output module in advance according to the preset feedforward model.

6. A dynamic compensation device for a CNC wire EDM machine according to claim 4, characterized in that, The controller also includes an adaptive learning module, which records the tension change curve, electric push rod response trajectory and wire breakage event data during the processing. It also uses a neural network-based machine learning algorithm to establish a mapping model between processing parameters and the optimal tension setting value to automatically recommend the target tension value.

7. A dynamic compensation device for a CNC wire EDM machine according to claim 1, characterized in that, The fixed base (51) is also equipped with a guide rail, and the movable wheel (53) slides with the guide rail through a slider seat. Limit buffers are provided at both ends of the guide rail.

8. A dynamic compensation device for a CNC wire EDM machine according to claim 1, characterized in that, The upper beam plate (2) and the lower beam plate (3) are respectively equipped with shock dampers, and the shock dampers are connected to the wheel axles of the upper guide wheel (21) and the lower guide wheel (31).

9. A dynamic compensation device for a CNC wire EDM machine according to claim 1, characterized in that, The surface of the thread rolling cylinder (6) is coated with a ceramic wear-resistant layer, and dynamic balance correction holes are provided at both ends of the thread rolling cylinder (6).

10. A dynamic compensation device for a CNC wire EDM machine according to claim 3, characterized in that, A coolant nozzle is installed on the side plate (4). The spray direction of the coolant nozzle is toward the processing gap between the molybdenum wire and the workpiece. The flow rate of the coolant nozzle is adjusted in real time by the controller according to the processing current.

Images