High-precision wire cutting machine tool with clamp-assisted structure

Abstract

The application relates to the technical field of wire cutting machine tools, in particular to a high-precision wire cutting machine tool with a clamp auxiliary structure, which comprises a workbench, one side of the workbench is provided with an X-Y axial moving mechanism, the other side of the workbench is provided with a wire feeding assembly, the middle part of the workbench is provided with a positioning frame, the first wire rack and the second wire rack are sequentially arranged on the positioning frame from top to bottom, and the first wire rack and the second wire rack are used for positioning a cutting molybdenum wire; a clamping assembly is arranged above the X-Y axial moving mechanism; a driving assembly is arranged below the clamping assembly; and an auxiliary assembly is arranged on both sides of the driving assembly. Compared with the prior art, the auxiliary assembly is arranged, the workpiece is adsorbed and leveled by an electromagnet before mechanical clamping, non-contact pre-fixing is realized, the workpiece displacement and initial deformation are effectively prevented, the surface quality is obviously improved, and the assembly realizes multi-sensor information fusion and active intervention.

Description

Technical Field

[0001] This invention relates to the field of wire EDM machine tool technology, and in particular to a high-precision wire EDM machine tool equipped with a clamping auxiliary structure. Background Technology

[0002] As a key piece of equipment in precision machining, the machining accuracy and stability of wire EDM machines largely depend on workpiece clamping techniques, motion control strategies, and the ability to monitor the machining process in real time. Traditional wire EDM machine fixtures mostly use rigid clamping methods such as mechanical pressure plates and screw locking. Although the structure is simple, it still has significant bottlenecks when dealing with thin-walled parts, complex contour parts, and high-precision corner machining.

[0003] In the prior art, Chinese patent document CN215658282U describes an auxiliary combination fixture for a wire EDM machine. This fixture, through the cooperation of a base, column, telescopic cantilever, and adsorption device, aims to help fix parts and prevent workpiece displacement or drop due to reduced material at the end of processing. While this fixture can adapt to parts of different sizes through telescopic and rotational adjustments, its adsorption device has a single function, primarily addressing the issue of preventing drop. It lacks effective suppression of initial workpiece deformation during clamping and cannot achieve adaptive and uniform distribution of clamping force, thus contributing little to establishing the "zero stress" benchmark required for high-precision machining. Furthermore, Chinese patent document CN219986460U describes an auxiliary fixture that achieves rapid clamping through spring tension and a movable clamping plate structure, aiming to improve clamping efficiency. However, this design does not integrate real-time monitoring and feedback adjustment functions for the machining process, and its intelligence is insufficient to cope with micro-deformations caused by material stress release or discharge impact during processing. Secondly, in complex trajectory machining, especially in corner precision control, existing technologies mostly focus on the rigidity of the machine tool body or simple wire feed speed adjustment. When facing sharp angles or small arc cutting, most machine tools are prone to geometric defects such as "rounded corners" and "collapsed corners" due to the inherent hysteresis effect of cutting molybdenum wire. Although some research is dedicated to optimizing the control algorithm of the wire feed system, a comprehensive solution that combines tension control, wire speed adjustment and discharge energy in a forward-looking and coordinated manner is still lacking. Finally, in terms of process monitoring and optimization, traditional machine tools generally lack integrated in-situ monitoring and proactive intervention capabilities. The assessment of processing status relies heavily on operator experience, making it difficult to achieve quantitative control and real-time compensation for key factors affecting surface quality, such as discharge status, molybdenum wire wear, and electrolytic effects.

[0004] Therefore, this application discloses a high-precision wire cutting machine tool with a clamp-assisted structure. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a high-precision wire EDM machine tool with a fixture-assisted structure to solve the problem that in machining complex trajectories and corners, the existing technology lacks multi-parameter collaborative control and integrated in-situ monitoring capabilities, resulting in limited machining accuracy and heavy reliance on human experience.

[0006] To achieve the above objectives, the present invention provides a high-precision wire cutting machine tool with a clamp-assisted structure, comprising: a worktable, an XY-axis moving mechanism on one side of the worktable, a wire feeding assembly on the other side of the worktable, a positioning frame in the middle of the worktable, and a first wire guide and a second wire guide arranged sequentially from top to bottom on the positioning frame, the first wire guide and the second wire guide being used for positioning and cutting molybdenum wire; A clamping assembly is disposed above the XY-axis moving mechanism and is used to assist in clamping the workpiece. A driving component is disposed below the clamping component, and the driving component is used to drive the clamping component to move and clamp. An auxiliary component is disposed on both sides of the drive component and below the workpiece, and is used to assist in processing when the workpiece is being processed. A pulse power supply is placed on the positioning frame and electrically connected to the cutting molybdenum wire and the workpiece to generate the pulse discharge energy required for processing.

[0007] Preferably, the clamping assembly includes a mounting plate fixedly installed on the top of the XY-axis moving mechanism. Positioning blocks are provided on the top of both sides of the mounting plate. First sliding grooves are provided on both sides of the top surface of the positioning blocks. Slider blocks are slidably installed inside the first sliding grooves. Fixed clamping plates are jointly installed on two sliders located on the same side. Movable clamping plates are provided on the opposite surfaces of the two fixed clamping plates. A plurality of return springs are provided between the fixed clamping plates and the movable clamping plates.

[0008] Preferably, each of the sliders has a support platform extending from one side for supporting the workpiece, and the support platform is provided as a smooth surface.

[0009] Preferably, a second sliding groove is provided on both sides of the side of the positioning block that is far apart from each other. The second sliding groove extends into the interior of the first sliding groove. A locking bolt is slidably installed on the second sliding groove, and the locking bolt is threadedly connected to the bottom side of the slider.

[0010] Preferably, the driving assembly includes a positioning ring fixedly installed in the middle of the mounting plate, a rotating ring rotatably installed at the top center of the positioning ring, and a second driving gear rotatably installed at the bottom of the positioning ring. The second driving gear is fixedly connected to the rotating ring. A forward and reverse motor is provided inside the top of the XY axial moving mechanism. A first driving gear is fixedly connected to the output end of the forward and reverse motor. The first driving gear meshes with the second driving gear. Four guide grooves are equidistantly opened on the circumference of the positioning ring. Four connecting rods are rotatably installed on the circumference of the rotating ring. The four connecting rods correspond to the four guide grooves. Guide sliders are slidably installed on two of the guide grooves. The guide sliders are L-shaped. One side of the guide slider is fixedly connected to one side of the fixed clamping plate. The other end of the two connecting rods is rotatably connected to the two guide sliders respectively. When the forward and reverse motor drives the first driving gear and the second driving gear to rotate, the rotating ring drives the four connecting rods to rotate, driving the two guide sliders to slide inside the guide grooves, causing the two fixed clamping plates to move closer and further apart.

[0011] Preferably, the auxiliary component includes auxiliary sliders that slide inside the other two guide grooves, and the other side of the other two linkage rods are rotatably connected to the two auxiliary sliders respectively. When the fixed clamps move closer to each other and further away from each other, the two auxiliary sliders also move closer to each other and further away from each other.

[0012] Preferably, each of the auxiliary sliders is provided with an electromagnet on the side where they are close to each other, an electrode plate is provided in the middle of each of the auxiliary sliders, and a V-shaped sink groove is provided on the side where the two auxiliary sliders are far apart from each other. A camera is provided on one side of each sink groove, and the two cameras are arranged facing each other.

[0013] Preferably, the wire feeding assembly is provided with a wire feeding roller and a tension roller with adjustable vertical position from top to bottom, and a drive motor for driving the wire feeding roller is provided on one side of the wire feeding roller.

[0014] Preferably, the drive motors of the tension roller and the wire feed roller, as well as the pulse power supply, are all electrically connected to a collaborative control module. The collaborative control module includes a trajectory pre-reading unit, a corner recognition unit, a tension adjustment unit, a wire speed adjustment unit, and a discharge parameter adjustment unit. The trajectory pre-reading unit is used to read trajectory data located in front of the current processing point in the trajectory to be processed. The corner recognition unit is used to determine the corner feature segment in the processing trajectory based on the included angle and radius of curvature of adjacent trajectory segments. When the current processing point is far from the starting point of the corner feature segment by a preset advance distance, the collaborative control module controls the tension adjustment unit to drive the tension roller to increase the tension of the cutting molybdenum wire, controls the wire speed adjustment unit to reduce the wire feeding speed of the drive motor, and controls the discharge parameter adjustment unit to reduce the pulse discharge energy of the pulse power supply. When the current processing point leaves the corner feature segment, the collaborative control module controls the cutting molybdenum wire tension, wire feeding speed, and pulse discharge energy to return to the straight segment processing parameters.

[0015] Preferably, a first guide wheel is provided on one side of the first wire frame, and the first guide wheel is located above the clamping assembly. A second guide wheel is provided on one side of the second wire frame, and the second guide wheel is located below the clamping assembly. The first guide wheel and the second guide wheel are located on the same horizontal line. A wire threading hole is provided through the middle of the positioning ring, and the wire threading hole is located directly below the second guide wheel.

[0016] The beneficial effects of this invention are: 1. This invention, by setting an auxiliary component that moves synchronously with the clamping assembly, allows the auxiliary slider to move synchronously to the corresponding position on the bottom of the workpiece along with the clamping action of the fixed clamping plate. This enables the position of the auxiliary component to automatically adapt to the workpiece size. Before mechanical clamping, the electromagnet can pre-adsorb and position ferromagnetic workpieces, or non-ferromagnetic workpieces can be pre-positioned using a magnetic backplate, vacuum adsorption components, etc., thereby reducing slippage and warping of the workpiece before mechanical clamping. After mechanical clamping, the camera can acquire image information of the processing area through the V-shaped recessed groove. The electrode plate can form an electrical connection with the bottom of the workpiece and apply a weak bias current or bias potential with the compensation power supply, thereby reducing the concentration of stray current near the processing area and improving processing stability and workpiece surface quality. Therefore, the auxiliary component not only plays a pre-positioning role during the clamping stage but also provides status acquisition and electrical parameter compensation functions during processing.

[0017] 2. This invention, by setting up a wire feeding assembly and a collaborative control module, enables the tension roller, the drive motor of the wire feeding roller, and the pulse power supply to perform forward-looking collaborative control based on the corner feature segments in the processing trajectory. When the trajectory pre-reading unit and the corner recognition unit determine that the current processing point is about to enter the corner feature segment, the collaborative control module can control the tension roller to increase the tension of the cutting molybdenum wire at a preset advance distance, control the drive motor to reduce the wire feeding speed, and control the pulse power supply to reduce the pulse discharge energy. After the current processing point leaves the corner feature segment, the tension of the cutting molybdenum wire, the wire feeding speed, and the pulse discharge energy are restored to the processing parameters of the straight segment. Through the above-mentioned feedforward collaborative adjustment, the tension of the cutting molybdenum wire can be improved in advance before corner processing, the influence of the inertia of the cutting molybdenum wire can be reduced, and the influence of discharge impact on the positional stability of the cutting molybdenum wire can be reduced. This helps to reduce the phenomenon of rounded corners, collapsed corners, or overcutting at corners, and improves the consistency of corner forming when processing complex contours.

[0018] 3. This invention, by setting up a clamping assembly and a driving assembly, enables two fixed clamping plates to synchronously approach or move away from each other under the action of the same driving source. The forward and reverse motors drive a rotating ring to rotate via a first and second driving gear. The rotating ring then drives a guide slider to move along a guide groove via a connecting rod, thereby achieving synchronous clamping or release of the two fixed clamping plates. Compared with manual single-sided clamping or step-by-step clamping methods, this structure helps reduce workpiece offset during the clamping process. A return spring is installed between the fixed clamping plate and the movable clamping plate, allowing the movable clamping plate to generate a certain floating compensation effect when contacting the workpiece. This helps to adapt to minor shape differences on the side of the workpiece, reduces local clamping stress concentration, and improves workpiece clamping stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the planar structure of the present invention; Figure 3 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the clamping component, driving component, and auxiliary component of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the planar structure of the clamping component and the driving component of the present invention; Figure 7 This is a schematic diagram of the drive component structure of the present invention; Figure 8 This is a partial structural diagram of the driving component of the present invention; Figure 9 This is a schematic diagram of the collaborative control module structure of the present invention.

[0021] The diagram is marked as follows: 1. Worktable; 2. XY axis moving mechanism; 3. Wire feeding assembly; 4. Wire feeding roller; 5. Tension roller; 6. Positioning frame; 7. First wire frame; 8. Second wire frame; 9. First guide wheel; 10. Second guide wheel; 11. Mounting plate; 12. Positioning ring; 13. Positioning block; 15. First slide groove; 16. Slider; 17. Fixed clamping plate; 18. Return spring; 19. Movable clamping plate; 20. Second slide groove; 21. Locking bolt; 22. Forward and reverse motor; 23. First drive gear; 24. Second drive gear; 25. Rotating ring; 26. Connecting rod; 27. Guide slide groove; 28. Guide slider; 29. ​​Auxiliary slider; 30. Electromagnet; 31. Electrode plate; 32. Sinking groove; 33. Camera; 34. Wire threading hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. Example

[0024] like Figures 1 to 9As shown, a high-precision wire EDM machine tool with a clamping-assisted structure includes a worktable 1, an XY-axis moving mechanism 2 on one side of the worktable 1, a wire feeding assembly 3 on the other side of the worktable 1, a positioning frame 6 in the middle of the worktable 1, and a first wire guide 7 and a second wire guide 8 arranged sequentially from top to bottom on the positioning frame 6 for positioning and cutting molybdenum wire; a clamping assembly, positioned above the XY-axis moving mechanism 2, for auxiliary clamping of the workpiece; a drive assembly, positioned below the clamping assembly, for driving the clamping assembly to move and clamp; and an auxiliary assembly, positioned below the drive assembly. On both sides of the moving assembly, auxiliary components are set below the workpiece for auxiliary processing during workpiece processing; pulse power supply, placed on the positioning frame 6, is electrically connected to the cutting molybdenum wire and the workpiece to generate the pulse discharge energy required for processing. The first wire frame 7 is provided with a first wire guide wheel 9 on one side, which is located above the clamping assembly. The second wire frame 8 is provided with a second wire guide wheel 10 on one side, which is located below the clamping assembly. The first wire guide wheel 9 and the second wire guide wheel 10 are located on the same horizontal line. The positioning ring 12 has a through wire hole 34 in the middle, which is located directly below the second wire guide wheel 10. Once the workpiece is in place, the XY-axis moving mechanism 2 receives instructions from the CNC system and drives the supporting components on it to perform precise planar motion along a predetermined machining trajectory. Simultaneously, the wire feeding assembly 3 is activated, driving the cutting molybdenum wire to perform high-speed reciprocating motion under the precise guidance of the first wire guide 7 and the second wire guide 8. Throughout the machining process, the pulse power supply operates continuously, generating high-frequency pulse electrical energy and applying it between the cutting molybdenum wire and the workpiece. Within a very small discharge gap, the working fluid medium is broken down, generating instantaneous high temperature to melt and cut the workpiece material. During this process, thanks to the short-path and low-loss advantages brought by the high-position installation of the pulse power supply, the discharge energy can be applied efficiently and stably, ensuring continuous high efficiency and high quality in the machining process.

[0025] like Figure 4 , Figure 6 , Figure 7 As shown, the clamping assembly includes a mounting plate 11 fixedly installed on the top of the XY axis moving mechanism 2. Positioning blocks 13 are provided on the top of both sides of the mounting plate 11. First sliding grooves 15 are provided on both sides of the top surface of the positioning blocks 13. Slider 16 is slidably installed inside the first sliding grooves 15. Fixed clamping plates 17 are installed on the two sliders 16 on the same side. Movable clamping plates 19 are provided on the opposite surfaces of the two fixed clamping plates 17. Several return springs 18 are provided between the fixed clamping plates 17 and the movable clamping plates 19. A support platform for supporting the workpiece extends from one side of each slider 16, and the support platform is set as a smooth surface. The operator places the workpiece on the support platform of the slider 16, and the initial position of the workpiece can be easily fine-tuned through the smooth surface of the support platform. Then the drive assembly (described in the following paragraphs) starts to work, driving the sliders 16 on both sides to move synchronously towards the workpiece within the first slide groove 15. The sliders 16 drive the fixed clamping plates 17 on them to move closer to the workpiece. When the movable clamping plate 19 on the fixed clamping plate 17 contacts the side of the workpiece, under the action of the return spring 18, the movable clamping plate 19 will adaptively adjust its tilt angle according to the microscopic shape of the workpiece surface to ensure that it forms a surface contact rather than a point contact with the workpiece surface. As the clamping force gradually increases, the return spring 18 is compressed, and the resulting reaction force is converted into a uniformly distributed clamping force, which not only firmly fixes the workpiece but also avoids stress concentration. Throughout the clamping process, the support platform always provides bottom support for the workpiece, forming a stable system with the clamping forces on both sides, ensuring that the workpiece will not be displaced or vibrate during subsequent processing. This flexible clamping method is particularly beneficial for clamping thin-walled parts or precision parts. By uniformly distributing force, it effectively avoids workpiece deformation during clamping and provides a reliable reference guarantee for subsequent high-precision processing.

[0026] like Figure 4 , Figure 6 , Figure 7 , Figure 8 As shown, the drive assembly includes a positioning ring 12 fixedly installed in the middle of the mounting plate 11. A rotating ring 25 is rotatably installed at the top center of the positioning ring 12. A second drive gear 24 is rotatably installed at the bottom of the positioning ring 12. The second drive gear 24 is fixedly connected to the rotating ring 25. A forward and reverse motor 22 is provided inside the top of the XY axis moving mechanism 2. A first drive gear 23 is fixedly connected to the output end of the forward and reverse motor 22. The first drive gear 23 meshes with the second drive gear 24. Four guide grooves 27 are equidistantly opened on the circumference of the positioning ring 12. Four connecting rods are rotatably installed on the circumference of the rotating ring 25. The moving rod 26 and four connecting rods 26 correspond to four guide slides 27. Guide sliders 28 are slidably installed on two of the guide slides 27. The guide sliders 28 are L-shaped. One side of the guide sliders 28 is fixedly connected to one side of the fixed clamping plate 17. The other ends of the two connecting rods 26 are rotatably connected to the two guide sliders 28 respectively. When the forward and reverse motor 22 drives the first drive gear 23 and the second drive gear 24 to rotate, the rotating ring 25 drives the four connecting rods 26 to rotate, driving the two guide sliders 28 to slide inside the guide slides 27, causing the two fixed clamping plates 17 to move closer and further apart. The forward and reverse motor 22 receives instructions from the control system and starts rotating. The motor output shaft drives the first drive gear 23 to rotate, and the power is transmitted to the second drive gear 24 through gear meshing. The rotation of the second drive gear 24 causes the rotating ring 25, which is fixedly connected to it, to rotate on the positioning ring 12. The rotation of the rotating ring 25 causes the four connecting rods 26, which are equidistantly mounted on its circumference, to move accordingly. Two of the connecting rods 26 are rotatably connected to the guide slider 28, converting the rotational motion into linear sliding of the guide slider 28 in the guide groove 27. The opposite or reverse movement of the two guide sliders 28 is directly controlled by their L-shaped structure. The two fixed clamping plates 17 are pushed synchronously to move closer to or away from the workpiece, thereby realizing the automated clamping or release of the workpiece. During the entire movement, due to the equidistant arrangement of the connecting rods 26 and the precise guidance of the guide grooves 27, the movement of the two fixed clamping plates 17 is ensured to always maintain perfect synchronization and symmetry, avoiding workpiece position displacement or additional stress caused by asynchronous clamping. This mechanism design of single motor driving the synchronous movement of double clamping plates not only simplifies the control system and improves reliability, but more importantly, it ensures that workpieces of different sizes can be automatically centered and clamped, establishing an accurate reference position for subsequent high-precision machining.

[0027] like Figure 4 , Figure 5 As shown, the auxiliary component includes auxiliary sliders 29 that slide inside the other two guide grooves 27. The other side of the other two connecting rods 26 is rotatably connected to the two auxiliary sliders 29 respectively. When the fixed clamps 17 move closer and further away from each other, the two auxiliary sliders 29 also move closer and further away from each other. An electromagnet 30 is provided on the side of the auxiliary sliders 29 that moves closer to each other. An electrode plate 31 is provided in the middle of the auxiliary sliders 29. A V-shaped sinkhole 32 is provided on the side of the two auxiliary sliders 29 that moves further away from each other. A camera 33 is provided on one side of the sinkhole 32. The two cameras 33 are arranged facing each other. The auxiliary slider 29 moves synchronously with the clamping assembly under the drive of the linkage 26, automatically adjusting to the optimal working position according to the workpiece size. After the workpiece is placed in place, the electromagnet 30 is energized first to generate a uniform adsorption force (limited to ferromagnetic workpieces; for non-ferromagnetic workpieces, the adaptation scheme can be replaced by vacuum adsorption, or a magnetic backing plate can be added below the workpiece). This gently adsorbs and initially levels the workpiece, providing a precise positioning basis for subsequent mechanical clamping and preventing the workpiece from sliding or shifting during the clamping process. After mechanical clamping is completed, the electrode plate 31 maintains stable contact with the bottom of the workpiece, preparing for the optimization of electrical parameters during the processing. After processing begins, two opposing cameras 33 perform three-dimensional imaging of the processing area through the V-shaped recessed groove 32. The system monitors the vibration, wear status, and discharge spark characteristics of the cutting molybdenum wire in real time. Its 3D vision configuration provides more comprehensive and accurate process information. During processing, the electrode plate 31 is supplied with a reverse current of corresponding parameters according to the monitoring data, effectively neutralizing stray currents that cause electrolytic corrosion. This innovative function significantly improves the surface quality of the processed material and avoids the electrochemical degradation layer problem in traditional wire EDM. Throughout the entire processing, the auxiliary components and the main processing system maintain a high degree of coordination. Through multi-sensor information fusion and active intervention control, they jointly ensure the high stability and high quality of the processing process, achieving truly intelligent precision machining. Among them, the electromagnet 30 set on the auxiliary slider 29 can generate an adsorption force before mechanical clamping. The purpose of this design is to pre-position and initially fix the ferromagnetic workpiece. Its advantage is to avoid displacement of the workpiece before final clamping, and at the same time, the uniform magnetic force distribution reduces the clamping stress of the workpiece. Especially for thin-walled workpieces, this non-contact pre-fixation method can effectively prevent the initial deformation of the workpiece. In one alternative embodiment, the electromagnet 30 is an electromagnetic adsorption component embedded on the upper surface of the auxiliary slider 29 or near the bottom surface of the workpiece. The electromagnet 30 is electrically connected to the controller via a wire. The controller can supply power to the electromagnet 30 before the mechanical clamping action begins, causing the electromagnet 30 to generate an adsorption force towards the bottom surface of the workpiece. For ferromagnetic workpieces, the electromagnet 30 directly adsorbs the bottom surface of the workpiece; for non-ferromagnetic but electrically conductive workpieces, a magnetic backplate can be temporarily set at the bottom of the workpiece, or the electromagnet 30 can be replaced with a vacuum adsorption component connected to a negative pressure air source to achieve pre-positioning of workpieces of different materials. The above-mentioned pre-positioning process occurs before the fixed clamping plate 17 fully clamps the workpiece, thereby reducing the slippage and warping of the workpiece during the mechanical clamping process.

[0028] In one optional embodiment, camera 33 is a liquid-resistant industrial camera. A transparent protective sheet is provided on the outer side of the lens of camera 33, facing the V-shaped recessed groove 32. The V-shaped recessed groove 32 is used to avoid the processing area of ​​the molybdenum wire cutting and forms the observation channel of camera 33. Two cameras 33 are located on opposite sides of the processing area, and their shooting directions intersect each other to acquire image information of the position of the molybdenum wire cutting, the vibration amplitude of the molybdenum wire cutting, the brightness of the discharge spark, and the processing gap area from two angles. After receiving the image information acquired by the two cameras 33, the controller can determine the vibration state of the molybdenum wire cutting by the periodic offset of the edge position of the molybdenum wire cutting in the image, and determine whether the discharge is concentrated or abnormal by the brightness of the discharge spark and the distribution area of ​​the spark.

[0029] In one optional embodiment, the electrode 31 is a corrosion-resistant conductive sheet, which can be made of copper alloy, graphite, or stainless steel. The electrode 31 is mounted on the auxiliary slider 29 via an insulating base. The upper surface of the electrode 31 is higher than or flush with the supporting surface of the auxiliary slider 29 so as to form contact with the bottom of the workpiece after it is placed. The electrode 31 is connected to the compensation power supply through a current-limiting resistor and an isolating switch. The compensation power supply is electrically isolated from the pulse power supply. The controller controls the opening and closing of the isolating switch according to the discharge status information collected by the camera 33 or according to the preset processing parameters, so that the electrode 31 applies a weak bias current or bias potential to the bottom of the workpiece, thereby reducing the concentration of stray current near the processing area. The output current of the compensation power supply is less than the processing current of the pulse power supply, and its conduction sequence avoids the main discharge peak period of the pulse power supply to avoid interfering with the main discharge cutting process.

[0030] Specifically, during the workpiece clamping stage, the controller first controls the electromagnet 30 or vacuum adsorption component to operate, positioning the workpiece above the support platform and auxiliary slider 29. Then, the controller controls the forward and reverse motors 22 to move the fixed clamping plate 17 and the movable clamping plate 19 closer together, mechanically clamping the workpiece. After mechanical clamping, the controller reduces or cuts off the adsorption current of the electromagnet 30, ensuring the workpiece is primarily held in place by the clamping components. During processing, the camera 33 continuously acquires images of the processing area, and the electrode plate 31 operates according to a preset compensation strategy. Thus, the auxiliary components not only assist in positioning the workpiece before clamping but also provide status detection and electrical parameter compensation during processing.

[0031] like Figure 1 , Figure 9 As shown, the drive motors of tension roller 5 and wire feed roller 4, as well as the pulse power supply, are all electrically connected to a collaborative control module. The collaborative control module includes a trajectory pre-reading unit, a corner recognition unit, a tension adjustment unit, a wire speed adjustment unit, and a discharge parameter adjustment unit. The trajectory pre-reading unit is used to read the trajectory data located in front of the current processing point in the trajectory to be processed. The corner recognition unit is used to determine the corner feature segment in the processing trajectory based on the included angle and radius of curvature of adjacent trajectory segments. When the current processing point is far from the starting point of the corner feature segment, the collaborative control module controls the tension adjustment unit to drive the tension roller 5 to increase the tension of the cutting molybdenum wire, controls the wire speed adjustment unit to reduce the wire feeding speed of the drive motor, and controls the discharge parameter adjustment unit to reduce the pulse discharge energy of the pulse power supply. When the current processing point leaves the corner feature segment, the collaborative control module controls the cutting molybdenum wire tension, wire feeding speed, and pulse discharge energy to return to the straight segment processing parameters. In one optional implementation, the collaborative control module includes a controller, a trajectory pre-reading unit, a corner recognition unit, a tension adjustment unit, a wire speed adjustment unit, and a discharge parameter adjustment unit. The controller can be a controller within the machine tool CNC system or an independent controller communicatively connected to the machine tool CNC system. The trajectory pre-reading unit is used to read machining trajectory data within a preset length range ahead of the current machining point. The machining trajectory data includes at least one of the following: straight line segments, circular arc segments, the angle between adjacent trajectory segments, the radius of the circular arc, and the change in the feed direction.

[0032] The corner recognition unit determines the corner feature segment based on the processing trajectory data read by the trajectory pre-reading unit. Specifically, when the included angle between two adjacent processing trajectory segments is less than a preset included angle threshold, or when the radius of curvature of an arc segment is less than a preset radius threshold, the corner recognition unit identifies the connection point of the adjacent trajectory segments or the arc segment as a corner feature segment. The preset included angle threshold and preset radius threshold can be preset according to the workpiece material, workpiece thickness, cutting molybdenum wire diameter, and processing accuracy requirements. For example, the preset included angle threshold can be 120°, 100°, 90°, or 60°, and the preset radius threshold can be any value within the range of 0.2mm to 2mm.

[0033] When the current processing point reaches the preset advance distance from the starting point of the corner feature segment, the controller sends control commands to the tension adjustment unit, wire speed adjustment unit, and discharge parameter adjustment unit simultaneously or in a preset sequence. The preset advance distance can be determined based on the wire feed speed, workpiece thickness, and cutting molybdenum wire diameter, for example, it can be set from 0.2mm to 5mm. When the workpiece is thicker, the wire feed speed is higher, or the cutting molybdenum wire diameter is smaller, the preset advance distance can be appropriately increased to ensure that the cutting molybdenum wire completes the tension and speed adjustment before entering the corner feature segment.

[0034] The tension adjustment unit drives the tension roller 5 to move vertically, thereby changing the path and tension of the cutting molybdenum wire in the wire feeding assembly 3. Before the processing point enters the corner section, the tension adjustment unit drives the tension roller 5 to move in the direction of increasing the tension of the cutting molybdenum wire, increasing the wire tension from the straight section processing tension T1 to the corner section processing tension T2, where T2 is greater than T1. The wire speed adjustment unit adjusts the speed of the drive motor, reducing the wire feeding speed from the straight section processing speed V1 to the corner section processing speed V2, where V2 is less than V1. The discharge parameter adjustment unit adjusts the peak current, pulse width, duty cycle, and / or pulse interval of the pulse power supply, ensuring that the discharge energy per unit time in the corner section is lower than that in the straight section.

[0035] In one specific control method, the controller first drives the tension roller 5 to increase the tension of the cutting molybdenum wire, then reduces the wire feeding speed of the drive motor, and subsequently reduces the discharge energy of the pulse power supply. In another specific control method, the controller can also execute the above three control actions simultaneously. By increasing the tension before the cutting molybdenum wire enters the corner feature section, the lateral hysteresis of the cutting molybdenum wire at the corner can be reduced; by reducing the wire feeding speed, the motion inertia of the cutting molybdenum wire and the fluctuation of the discharge gap can be reduced; by reducing the pulse discharge energy, the influence of the discharge impact on the instantaneous deviation of the cutting molybdenum wire can be reduced. Therefore, the combination of these three measures can reduce the probability of rounded corners, collapsed corners, or overcutting at the corner.

[0036] Once the current processing point leaves the corner feature section, the controller restores the tension adjustment unit, wire speed adjustment unit, and discharge parameter adjustment unit to the straight-line processing parameters. Specifically, the tension roller 5 returns to the straight-line processing position, the drive motor resumes the wire feeding speed for the straight-line section, and the pulse power supply resumes the discharge parameters for the straight-line section. The restoration process can employ a stepped restoration or a ramp restoration to avoid sudden changes in the cutting molybdenum wire tension, wire feeding speed, and discharge energy. Example

[0037] like Figure 4 , Figure 6 , Figure 7 As shown, the positioning block 13 has a second sliding groove 20 on both sides of the side that are far apart from each other. The second sliding groove 20 extends into the interior of the first sliding groove 15. A locking bolt 21 is slidably installed on the second sliding groove 20. The locking bolt 21 is threadedly connected to the bottom side of the slider 16. In this embodiment, the operator can manually adjust according to the specific requirements of the workpiece. First, loosen the locking bolt 21 to allow it to slide in the second slide groove 20, thereby releasing the lock on the slider 16. Then, manually push the slider 16 in the first slide groove 15 to the desired position. During this process, the locking bolt 21 moves synchronously in the second slide groove 20, providing guidance for the slider 16 and preventing it from coming out. Once the position is determined, tighten the locking bolt 21 to firmly press the slider 16 onto the positioning block 13 through the threaded connection, generating a huge frictional force to achieve rigid locking. This retains the convenience of automated operation and provides the flexibility of manual intervention, greatly enhancing the equipment's ability to cope with complex working conditions. At the same time, it reduces the dependence on drive components and helps extend the service life of the motor and transmission mechanism.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0039] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A high-precision wire cutting machine tool equipped with a clamp-assisted structure, characterized in that, include: A workbench (1) is provided with an X-Y axis moving mechanism (2) on one side of the workbench (1) and a wire feeding assembly (3) on the other side of the workbench (1). A positioning frame (6) is provided in the middle of the workbench (1). A first wire frame (7) and a second wire frame (8) are arranged sequentially from top to bottom on the positioning frame (6). The first wire frame (7) and the second wire frame (8) are used for positioning and cutting molybdenum wire. A clamping assembly is disposed above the X-Y axis moving mechanism (2). The clamping assembly is used to assist in clamping the workpiece. The clamping assembly includes a mounting plate (11) fixedly installed on the top of the X-Y axis moving mechanism (2). Positioning blocks (13) are provided on the top of both sides of the mounting plate (11). First sliding grooves (15) are provided on both sides of the top surface of the positioning blocks (13). Slider blocks (16) are slidably installed inside the first sliding grooves (15). Fixed clamping plates (17) are jointly installed on the two sliders (16) on the same side. Movable clamping plates (19) are provided on the opposite surfaces of the two fixed clamping plates (17). Several return springs (18) are provided between the fixed clamping plates (17) and the movable clamping plates (19). A driving component is disposed below the clamping component. The driving component is used to drive the clamping component to move and clamp. The driving component includes a positioning ring (12) fixedly installed in the middle of the mounting plate (11). Four guide grooves (27) are equidistantly opened on the circumference of the positioning ring (12). Guide sliders (28) are slidably installed on two of the guide grooves (27). The two guide sliders (28) slide inside the guide grooves (27), causing the two fixed clamping plates (17) to move closer and further away from each other. An auxiliary component is provided on both sides of the drive component and below the workpiece. It is used to assist in the processing of the workpiece. The auxiliary component includes an auxiliary slider (29) that slides inside the other two guide grooves (27). An electromagnet (30) is provided on the side of the auxiliary slider (29) that is close to each other. An electrode plate (31) is provided in the middle of the auxiliary slider (29). A V-shaped sinkhole (32) is provided on the side of the two auxiliary sliders (29) that is far away from each other. A camera (33) is provided on one side of the sinkhole (32). The two cameras (33) are arranged facing each other. A pulse power supply is placed on the positioning frame (6) and is electrically connected to the cutting molybdenum wire and the workpiece to generate the pulse discharge energy required for processing.

2. The high-precision wire cutting machine tool with a clamp-assisted structure according to claim 1, characterized in that, Each of the sliders (16) has a support platform extending from one side for supporting the workpiece, and the support platform is set to a smooth surface.

3. The high-precision wire cutting machine tool with a clamp-assisted structure according to claim 2, characterized in that, The positioning block (13) has a second slide groove (20) on both sides of the side that are far apart from each other. The second slide groove (20) extends into the interior of the first slide groove (15). A locking bolt (21) is slidably installed on the second slide groove (20). The locking bolt (21) is threadedly connected to the bottom side of the slider (16).

4. The high-precision wire cutting machine tool with a clamp-assisted structure according to claim 1, characterized in that, A rotating ring (25) is rotatably mounted on the top center of the positioning ring (12), and a second drive gear (24) is rotatably mounted on the bottom of the positioning ring (12). The second drive gear (24) is fixedly connected to the rotating ring (25). A forward and reverse motor (22) is provided inside the top of the X-Y axis moving mechanism (2). A first drive gear (23) is fixedly connected to the output end of the forward and reverse motor (22). The first drive gear (23) meshes with the second drive gear (24). The rotating ring (25) rotates circumferentially at equal intervals. Four connecting rods (26) are installed, and the four connecting rods (26) correspond to the four guide slides (27). The guide sliders (28) are L-shaped. One side of the guide sliders (28) is fixedly connected to one side of the fixed clamp (17). The other ends of two connecting rods (26) are rotatably connected to two guide sliders (28) respectively. When the forward and reverse motors (22) drive the first drive gear (23) and the second drive gear (24) to rotate, the rotating ring (25) drives the four connecting rods (26) to rotate.

5. The high-precision wire cutting machine tool with a clamp-assisted structure according to claim 4, characterized in that, The other two connecting rods (26) are rotatably connected to the two auxiliary sliders (29) respectively. When the fixed clamp (17) moves closer to each other and away from each other, the two auxiliary sliders (29) also move closer to each other and away from each other.

6. The high-precision wire cutting machine tool with a clamp-assisted structure according to claim 1, characterized in that, The wire feeding assembly (3) is provided with a wire feeding roller (4) and a tension roller (5) with adjustable up and down positions from top to bottom. A drive motor for driving the wire feeding roller (4) is provided on one side of the wire feeding roller (4).

7. The high-precision wire cutting machine tool with a clamp-assisted structure according to claim 6, characterized in that, The drive motors of the tension roller (5), the wire feeding roller (4), and the pulse power supply are all electrically connected to a collaborative control module. The collaborative control module includes a trajectory pre-reading unit, a corner recognition unit, a tension adjustment unit, a wire speed adjustment unit, and a discharge parameter adjustment unit. The trajectory pre-reading unit is used to read the trajectory data located in front of the current processing point in the trajectory to be processed. The corner recognition unit is used to determine the corner feature segment in the processing trajectory based on the included angle and radius of curvature of adjacent trajectory segments. When the current processing point is far from the starting point of the corner feature segment, the collaborative control module controls the tension adjustment unit to drive the tension roller (5) to increase the tension of the cutting molybdenum wire, controls the wire speed adjustment unit to reduce the wire feeding speed of the drive motor, and controls the discharge parameter adjustment unit to reduce the pulse discharge energy of the pulse power supply. Once the current processing point leaves the corner feature segment, the collaborative control module controls the cutting molybdenum wire tension, wire feed speed, and pulse discharge energy to return to the straight-line processing parameters.

8. The high-precision wire cutting machine tool with a clamp-assisted structure according to claim 1, characterized in that, A first guide wheel (9) is provided on one side of the first wire frame (7), and the first guide wheel (9) is located above the clamping assembly. A second guide wheel (10) is provided on one side of the second wire frame (8), and the second guide wheel (10) is located below the clamping assembly. The first guide wheel (9) and the second guide wheel (10) are located on the same horizontal line. A wire threading hole (34) is provided through the middle of the positioning ring (12), and the wire threading hole (34) is located directly below the second guide wheel (10).

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