A new type of precision medium-speed wire cutting machine with large swing

Abstract

The present invention discloses a novel precision medium-wire large-swing wire cutting machine, which relates to the field of wire cutting machines and aims to solve the problem that when cutting at a large angle, the upper and lower wire racks are generally fixed, and taper cutting is performed only by adjusting the UV module, resulting in a very limited cutting angle. The key points of the technical solution are that the end of the lower wire rack body close to the column is rotatably connected and provided with a wire rack slide rod, the end of the upper wire rack body close to the column is rotatably connected and provided with a wire rack slide rod, and the ends of the upper and lower wire rack bodies away from the column are rotatably installed with an electrode wire follower assembly, the upper wire rack body, the lower wire rack body and the wire rack slide rod are located in the same plane, the upper wire rack body, the lower wire rack body and the wire rack slide rod form a large-taper connecting rod mechanism with large-angle movement, and the upper wire rack body is movably arranged, so as to achieve the effect of being able to rotate relative to the lower wire rack body to form a parallelogram linkage structure to increase the taper cutting range.

Description

Technical Field

[0001] The invention relates to the technical field of wire-cutting machine tools, in particular to a novel precision medium-speed wire-cutting machine tool with large swing. Background Art

[0002] This invention relates to the field of wire cutting technology, specifically to reciprocating high-speed wire EDM machines. This machine implements multiple cutting capabilities, commonly known as "medium-wire EDM." A medium-wire EDM machine uses a moving wire as a tool electrode, generating discharges in the gap between the wire electrode and the workpiece, thereby machining the workpiece into the desired shape. Its wire speed and workpiece quality lie between those of fast and slow wire cutting, hence the name "medium-wire."

[0003] The mechanical structure of a typical medium-speed wire-cut EDM machine consists of a bed, a transmission mechanism, a middle support plate, an upper support plate, a lower bobbin body, a workpiece support, a lower water spray plate assembly, an upper water spray plate assembly, an upper bobbin body, a Z-axis lift mechanism, a column, and a wire transport assembly. The Z-axis lift mechanism, the upper bobbin body head, and the upper water spray plate assembly are fixed to the column and finally to the bed, which provides physical support for the entire machine. The electrode wire used to cut the workpiece is wound around the wire transport assembly, passing through the wire tensioning mechanism, the upper bobbin body, the water spray plate assembly, the lower bobbin body, and finally back to the wire transport assembly, forming a closed loop and enabling reciprocating cutting of the workpiece.

[0004] The wire head of ordinary reciprocating machine tools is fixed, and the deflection of the molybdenum wire is controlled by the wire guide nozzles on the upper and lower spindle heads. Small angles are possible, but when cutting at large angles, the electrode wire will rub hard against the edge of the hole of the jewel nozzle of the water spray plate, and the wear of the electrode wire and the jewel nozzle will be aggravated. Even if the electrode wire is bent too much, excessive stress will cause the electrode wire to break and affect the wire cutting process. Therefore, a large swing wire cutting machine is required to achieve the effect of large taper processing. Summary of the Invention

[0005] The purpose of the present invention is to provide a new type of precision medium-speed large-swing wire cutting machine to solve the problem that when cutting large angles, the upper and lower wire racks are generally fixed and the cutting angle is very limited.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The Z-axis lifting mechanism is fixedly mounted on the outer wall of the column near one end of the bed, and a Z-axis slide is fixedly mounted on the outer wall of the column to move along the Z-axis and a Z-axis lifting mechanism that drives the Z-axis slide to move is slidingly mounted on the lower end of the Z-axis slide. The UV module is fixedly connected to the upper wire frame body, and one end of the lower wire frame body is rotatably connected to the wire frame slide, and one end of the upper wire frame body is rotatably connected to the wire frame slide, and the end of the upper wire frame body and the lower wire frame body away from the column are rotatably mounted. The upper wire frame body, the lower wire frame body and the wire frame slide are located in the same plane, and the upper wire frame body, the lower wire frame body and the wire frame slide form a large-taper connecting rod mechanism with large-angle movement.

[0008] By adopting the above technical solution, the bed has a herringbone structure, the part supporting the wire transport component is a narrow side, and the part supporting the XY axis transmission mechanism is a wide side. While taking into account the design accuracy, the overall mechanical strength is guaranteed. At the same time, it can reach the support strength of the extreme position during the actual processing movement of the machine tool to ensure the accuracy of the mechanical structure. The wire expansion component is installed on the side of the column, and the middle of the column is hollowed out to facilitate the installation and arrangement of equipment such as counterweights, water pipes, and cables. The Z axis lifting mechanism is installed on the outer wall of the column, and the reinforcement ribs are optimized to optimize the overall mechanical strength, ensure the mechanical accuracy of the Z axis lifting mechanism and UV axis during movement, and the electrode wire is moved from the top when in use. The end of the wire rack body passes through the end of the lower wire rack body, and the upper wire rack body, the lower wire rack body and the wire rack slide rod are combined with the electrode wire to form a parallelogram. Since the wire rack slide rod is rotated to connect the lower wire rack body, and the upper wire rack body is rotatably connected to the wire rack slide rod and is controlled by the UV module connection, the UV module drives the upper wire rack body to move synchronously when it slides. Since the wire rack slide rod, the lower wire rack body and the upper wire rack body are located in the same plane and rotate, the electrode wire can move synchronously with the large-taper connecting rod mechanism when the wire tensioning assembly is tightened. The electrode wire state can be adjusted along the parallelogram motion trajectory to achieve the effect of autonomously adjusting the cutting angle according to actual needs.

[0009] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

[0010] By adopting the above technical solution, the UV module will make linear motion, which will drive the upper wire rack body to make linear motion synchronously, and rotate forward and backward along the hinge point at the end of the upper wire rack connecting rod and the hinge point at the end of the lower wire rack connecting rod, that is, the large-taper connecting rod mechanism that moves along the parallelogram frame. The angle of movement of the UV module will be transmitted to the electrode wire through the large-taper connecting rod mechanism, and finally act on the electrode wire to change the cutting angle of the workpiece, thereby realizing precise cutting of the taper. At the same time, since the upper wire rack connecting rod is respectively hinged to the upper wire rack shaft sleeve and the upper water spray plate, and the lower wire rack connecting rod is respectively hinged to the lower wire rack shaft sleeve and the lower water spray plate, when the large-taper connecting rod mechanism moves, the upper wire rack connecting rod and the lower wire rack connecting rod will drive the upper water spray plate and the lower water spray plate to adaptively follow under the action of the parallelogram frame, thereby effectively adjusting the water spray angle.

[0011] Furthermore, the upper water spray plate and the lower water spray plate include a shaped plate that is hinged to the upper wire rack body and the lower wire rack body, and a rotating bearing is provided for the shaped plates to be rotatably connected. Hinge holes are provided on both sides of the shaped plates, and a jewel water nozzle is fixedly provided at one end of the shaped plate away from the hinge point. The jewel water nozzle is connected to the side of the liquid cavity, and the outer wall of the liquid cavity is connected to the water inlet pipe joint and the auxiliary water outlet. The upper wire rack connecting rod and the lower wire rack connecting rod are hinged to the liquid cavity.

[0012] By adopting the above technical solution, when in use, the electrode wire first passes through the rolling bearing and then passes through the gem water nozzle. The water inlet pipe joint is connected to the external working fluid circulation system. The working fluid flows through the liquid mold cavity. The hinge hole is used to hinge the mold plate with the upper wire rack body or the end of the lower wire rack body. Due to the presence of the electrode wire follower assembly, the water spray angle of the upper water spray plate and the lower water spray plate will adaptively adjust to match the cutting angle conversion of the electrode wire. In large-taper wire cutting, the water spray part plays a key role. When the water spraying operation is in progress, the upper wire rack connecting rod moves synchronously with the movement of the UV module, and the connected water spray plate will naturally move with it. Since the water nozzle and the electrode wire always maintain the same angle, the axis of the gem water nozzle is always parallel to the electrode wire, so it will not conflict with the edge of the gem water nozzle for wire feeding, which can effectively avoid the hard friction between the electrode wire and the edge of the gem water nozzle during taper cutting, reduce the wear of both, and effectively reduce the jitter of the electrode wire during processing, which can effectively improve the stability of the processing process, thereby improving the processing accuracy and the surface finish of the processing. The auxiliary water outlet can also be additionally connected to the universal joint water pipe, and the water spray angle and position can be freely adjusted to further optimize the water spray effect, thereby improving the accuracy and stability of large tapers.

[0013] The outer wall of the Z-axis ram is fixedly provided with a second lead screw for positioning and rotating and a second drive motor that drives the second lead screw to rotate, and the second lead screw thread cooperates and passes through the UV slider setting.

[0014] By adopting the above technical solution, when in use, the first drive motor cooperates with the first lead screw, and by controlling the rotation of the first lead screw, the guide rail slider is controlled to slide up and down through the thread cooperation, and the guide rail slider drives the Z-axis slide to move up and down along the Z-axis slide rail. By controlling the number of rotations of the first drive motor, the up and down movement distance of the Z-axis slide rail can be accurately controlled. Similarly, the second drive motor cooperates with the second lead screw to further accurately control the horizontal movement distance of the UV module. The first drive motor has a built-in brake function to prevent the head from moving down after power failure. The Z-axis slide is designed as a trapezoidal oblique rib frame casting structure to ensure high rigidity while reducing weight. When the Z-axis slide When the guide rail slider moves upward, the upper wire rack body is pulled to move by the wire rack slide bar. During the movement of the Z-axis slide, the guide rail slider and the UV module will pull the upper wire rack body to move at the same time. Since they are at the same center, the error in the movement process will be reduced and the accuracy will not be affected. The UV module has the function of adjusting the angle of the upper wire rack body in the U and V axes. Since the upper wire rack body is connected to the wire rack slide bar through the upper wire rack shaft sleeve and the upper wire rack assembly and the lower wire rack assembly are respectively rotatably connected to the upper wire rack body and the lower wire rack body, the angle can be adaptively adjusted when the UV module adjusts the U and V axes, thereby further improving the adjustable range of taper processing.

[0015] At the same time, the center positions of the upper and lower wire rack bodies are the same, and the accuracy during coordinated movement is relatively high, causing very small errors. The entire module is smoothly operated, with small errors and stability. Overall, the Z-axis lifting mechanism ensures sufficient rigidity during the movement of the Z, U, and V axes, thereby ensuring cutting accuracy and stability.

[0016] Furthermore, the wire tensioning assembly includes a wire tensioning panel fixedly arranged on the outer wall of the column, the top outer wall of the wire tensioning panel is fixedly provided with a guide wheel seat, the center of the wire tensioning panel is provided with a vertical wire tensioning slide rail, and the wire tensioning slide rail is slidably provided with a heavy hammer slider group, and a limited mounting plate is extended from the outer wall of the guide wheel seat, and the limit mounting plate is slidably provided with a wire tensioning control bolt, and the outer wall of the heavy hammer slider group is provided with a pin hole for the wire tensioning control bolt to be locked, and elastic limit anti-collision blocks are distributed on both sides of the bottom end of the wire tensioning slide rail, and the limit anti-collision blocks are fixedly provided on the outer wall of the wire tensioning panel, and the outer wall of the guide wheel seat is fixedly provided with a first fixed guide wheel and a second fixed guide wheel located on both sides of the wire tensioning slide rail, and the outer wall of the heavy hammer slider group is fixedly provided with a movable guide wheel matching the first fixed guide wheel and the second fixed guide wheel.

[0017] By adopting the above technical solution, when in use, the electrode wire passes through the first fixed guide wheel, the movable guide wheel and the second fixed guide wheel in sequence, and reciprocates on the guide wheel group. By controlling the two states of locking and unlocking of the wire tensioning control bolt, the heavy hammer slider group can be pre-hung. After the operation is completed, the wire tensioning control bolt is switched to another state to release the lock with the pin hole, so that the electrode wire can be naturally pulled by the heavy hammer slider group, and it can play a buffering role, which can compensate for the tension loss caused by long-term use of the electrode wire and ensure the constant tension of the electrode wire. A limited anti-collision block is provided under the wire tensioning panel, which can prevent rigid collision and limit the position. The heavy hammer slider group moves linearly up and down on the wire tensioning panel along the wire tensioning slide rail, ensuring that the pulling direction of the electrode wire is always constant. The first fixed guide wheel, the second fixed guide wheel and the movable guide wheel are designed at a certain angle so that the electrode wire is always in a vertical state, which can ensure that the tension acting on the electrode wire by the heavy hammer slider group is always constant during the up and down movement of the heavy hammer slider group.

[0018] Furthermore, the large-taper connecting rod mechanism is equipped with an electrode wire protection device, which includes an upper water spray plate and a lower water spray plate that wrap the electrode wire. An upper wire rack water receiving tray is spaced apart and connected below the upper wire rack body. A first water baffle and a second water baffle are installed above the upper wire rack body on both sides of the UV module. The first water baffle is fixedly connected to the top wall of the upper wire rack, and the second water baffle is slidably pushed and pulled on the outer wall of the UV module. The first water baffle and the second water baffle cover the upper part of the upper wire rack body. The outer wall of the column is provided with a wire expansion groove for the wire expansion assembly to be embedded and placed, and the outer wall of the column is hingedly provided with a wire expansion guard covering the wire expansion groove.

[0019] By adopting the above technical solution, there is also a high-speed running electrode wire above the upper wire rack body, and the working fluid attached to it will also splash everywhere. The upper wire rack water tray is located below it, which is responsible for collecting the dripping working fluid into the machine tool water tank, and then discharging it centrally, filtering it through the water tank and then recycling it. The first water baffle and the second water baffle are located above the upper wire rack to prevent the working fluid from splashing around, which can effectively prevent other foreign matter from entering, avoid affecting the operation of the electrode wire, ensure the safety and stability of wire cutting processing, and prevent the working fluid attached to the high-speed moving electrode wire from splashing. The wire expansion guard plate reserves the operation of the wire expansion control device The window also uses a hinge to facilitate the opening and closing of the wire expansion guard plate, which completely wraps up all the electrode wires. The second water baffle is close to the end part of the upper wire frame body. Because the movement space here is limited and there is a UV module above it, it is designed to be a linear push-pull structure. Through the linear bearing assembly, it can achieve linear motion. When operations such as replacing the electrode wire need to be performed, you only need to push the second water baffle toward the UV module. At this time, the electrode wire will be exposed, which is convenient for operation. When the electrode wire is in normal cutting processing, push the second water baffle in the opposite direction to wrap up the electrode wire as a whole to achieve the purpose of protection, safety and environmental protection.

[0020] Furthermore, the wire transport assembly includes a wire transport drum, which is rotatably mounted on the top wall of the bed, and the wire transport drum is wound with an electrode wire.

[0021] Through the above technical solution, the electrode wire passes through the wire expansion assembly, the upper wire rack body and the lower wire rack body in sequence and then revolves around the wire transport drum, achieving the effect of complete closed-loop reciprocating wire cutting of the workpiece.

[0022] The top end of the guide rail is fixedly provided with a sliding block that fits the slide rail groove, and the bottom end of the guide rail is fixedly provided with a sliding block that fits the slide rail groove.

[0023] By adopting the above technical solution, since the large-taper connecting rod mechanism is fixedly installed at two points by means of the lower wire rack body and the fixed connection UV module, during the movement process, due to the small number of fixed points and the fact that they are all movable connections, the overall structural strength and movement stability of the device are insufficient. During long-term use, the service life and stability are far inferior to the fixed installation structure. Therefore, a positioning plate is added at the end of the wire rack slide rod, which allows the wire rack slide rod to move freely along a fixed angle while adding another movable connection point with the column, thereby effectively enhancing the movement stability of the large-taper connecting rod mechanism. During use, the slider at the end of the wire rack slide rod rotates along the hinge point between the wire rack slide rod and the lower wire rack body through the cooperation of the slide bar and the interlocking groove and the cooperation of itself and the slide rail groove. The positioning plate can effectively suppress the shaking of the large-taper connecting rod mechanism in the lateral direction. The limit plate is detachable. When removed, the slide rail groove is completely exposed, which is convenient for the installation of the slider. When installing the limit plate, the limit plate is pressed against the surface of the positioning plate, and the installation position is quickly found through the cooperation of the guide block and the guide groove, making the installation more convenient.

[0024] In summary, the beneficial technical effects of the present invention are:

[0025] 1. A large-taper connecting rod mechanism is adopted. When the wire tensioning assembly is in a taut state, the electrode wire can move synchronously with the large-taper connecting rod mechanism. The electrode wire state can be adjusted along a parallelogram motion trajectory to achieve the effect of autonomously adjusting the cutting angle according to actual needs.

[0026] 2. The electrode wire follower assembly is adopted. When the large-taper connecting rod mechanism moves, the upper and lower wire frame connecting rods will drive the upper and lower water spray plates to adaptively follow under the action of the parallelogram frame, thereby effectively adjusting the water spray angle. Since the gem water nozzle and the electrode wire will always maintain the same angle, the axis of the gem water nozzle is always parallel to the electrode wire, so it will not conflict with the edge of the gem water nozzle during wire feeding, which can effectively avoid the hard friction between the electrode wire and the edge of the gem water nozzle during taper cutting;

[0027] 3. The electrode wire protection device is used to effectively prevent other foreign objects from entering, avoid affecting the operation of the electrode wire, ensure the safety and stability of wire cutting, and prevent the working fluid from splashing on the high-speed moving electrode wire;

[0028] 4. The Z-axis lifting mechanism and UV module are used. The precision is relatively high when they are coordinated, and the error caused will be very small. The whole module is smooth to operate, with small error and stability. In general, the Z-axis lifting mechanism ensures sufficient rigidity when the Z, U and V axes move, thereby ensuring the accuracy and stability of cutting.

[0029] 5. A positioning plate is used to allow the wire rack slide to move freely along a fixed angle while adding another movable connection point with the column, thereby effectively enhancing the movement stability of the large-taper connecting rod mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the overall structure of the wire-stretching assembly in the present invention;

[0033] Figure 3 It is a schematic diagram of the overall structure of the Z-axis lifting mechanism of the present invention;

[0034] Figure 4 This is a front structural diagram of the large-taper connecting rod mechanism of the present invention;

[0035] Figure 5 This is a schematic diagram of the overall structure of the molded plate in the present invention. Figure 1 ;

[0036] Figure 6 This is a schematic diagram of the overall structure of the molded plate in the present invention. Figure 2 ;

[0037] Figure 7 It is a schematic diagram of the overall structure of the Z-axis ram in the invention;

[0038] Figure 8 This is a schematic diagram of the back structure of the large-taper connecting rod mechanism in the present invention;

[0039] Figure 9 This is a schematic diagram of the explosion structure of the positioning plate in the present invention Figure 1 ;

[0040] Figure 10 This is a schematic diagram of the explosion structure of the positioning plate in the present invention Figure 2 .

[0041] In the figure, 1, bed; 101, XY axis transmission mechanism; 102, middle support plate; 103, upper support plate; 104, workpiece support frame; 105, column; 2, wire transport assembly; 3, wire expansion assembly; 31, wire expansion panel; 32, guide wheel seat; 33, wire expansion slide rail; 34, heavy hammer slider assembly; 35, limit mounting plate; 36, wire expansion control bolt; 37, pin hole; 38, limit anti-collision block; 39, first fixed guide wheel; 391, second fixed guide wheel; 40, Dynamic guide wheel; 4. Borehole frame body; 41. Borehole frame sleeve; 42. Lower rotating shaft; 43. Borehole frame bearing; 44. Borehole frame assembly; 5. Z-axis lifting mechanism; 51. Z-axis ram; 52. Z-axis slide rail; 53. Guide rail slider; 6. UV module; 7. Borehole frame body; 71. Borehole frame sleeve; 72. Upper rotating shaft; 73. Borehole frame bearing; 74. Borehole frame assembly; 8. Borehole frame slide bar; 9. Electrode wire follower assembly; 10. Large-taper connecting rod mechanism; 11. Upper spray plate; 111. Upper wire rack connecting rod; 12. Lower spray plate; 121. Lower wire rack connecting rod; 13. Moulding plate; 131. Hinge hole; 132. Gem water nozzle; 133. Liquid cavity; 134. Water inlet pipe joint; 135. Auxiliary water outlet; 136. Rotating bearing; 14. First drive motor; 141. First lead screw; 142. Upper plate; 143. UV slide rail; 144. UV slider; 145. Middle plate; 146. Lower plate ; 15. Second lead screw; 151. Second drive motor; 16. Electrode wire protection device; 161. Upper wire rack water receiving tray; 162. First water baffle; 163. Second water baffle; 164. Wire expansion groove; 165. Wire expansion guard plate; 17. Wire transport roller; 18. Positioning plate; 181. Slide rail groove; 182. Engaging groove; 183. Slider; 184. Slide bar; 185. Limit plate; 186. Limit block; 187. Guide block; 188. Guide groove. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings.

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] See also Figures 1-10 , the present invention provides a technical solution:

[0045] The bed comprises a bed 1, the bed 1 is equipped with a wire transport component 2, an XY axis transmission mechanism 101, a middle support plate 102, an upper support plate 103, a workpiece support frame 104 and a column 105. The side wall of the column 105 is fixedly installed with a wire expansion component 3. The outer wall of the column 105 close to one end of the bed 1 is fixedly provided with a lower wire rack body 4. The outer wall of the column 105 is fixedly provided with a Z-axis slide 51 moving along the Z axis and a Z-axis lifting mechanism 5 driving the Z-axis slide 51 to move. The lower end of the Z-axis slide 51 is slidably provided with a UV module 6. The UV module 6 is fixedly connected to the upper wire rack body 7. The lower wire rack body 4 is close to the One end near the column 105 is rotatably connected to a wire rack slide 8, and the upper wire rack body 7 is rotatably connected to the wire rack slide 8 at one end near the column 105. The upper wire rack body 7 and the lower wire rack body 4 are rotatably installed at one end away from the column 105 with an electrode wire follower assembly 9. The upper wire rack body 7, the lower wire rack body 4 and the wire rack slide 8 are located in the same plane. The upper wire rack body 7, the lower wire rack body 4 and the wire rack slide 8 form a large-taper connecting rod mechanism 10 with a large angle of movement. The bed 1 is a herringbone structure, the part supporting the wire transport assembly 2 is a narrow side, and the part supporting the XY axis transmission mechanism 101 is a wide side. While taking into account the design accuracy, it ensures the overall mechanical strength, and at the same time can reach the support strength of the extreme position during the actual processing movement of the machine tool to ensure the accuracy of the mechanical structure. The wire expansion component 3 is installed on the side of the column 105, and the middle of the column 105 is hollowed out to facilitate the installation and arrangement of equipment such as counterweights, water pipes, and cables. The Z-axis lifting mechanism 5 is installed on the outer wall of the column 105, and the reinforcement ribs are optimized to optimize the overall mechanical strength, ensuring the mechanical accuracy of the Z-axis lifting mechanism 5 and the UV axis during movement. When in use, the electrode wire passes through the end of the upper wire rack body 7 into the end of the lower wire rack body 4, and the upper wire rack body 7 and the lower wire rack body 7 are connected. The wire rack body 4 and the wire rack slide rod 8 are combined with the electrode wire to form a parallelogram. Since the wire rack slide rod 8 is rotatably connected to the lower wire rack body 4, and the upper wire rack body 7 is rotatably connected to the wire rack slide rod 8 and is controlled by the UV module 6, the UV module 6 drives the upper wire rack body 7 to move synchronously when it slides. Since the wire rack slide rod 8, the lower wire rack body 4 and the upper wire rack body 7 are located in the same plane and rotate, the electrode wire can move synchronously with the large-taper connecting rod mechanism 10 when the wire tensioning assembly 3 is in a taut state, and the electrode wire state can be adjusted along the parallelogram motion trajectory to achieve the effect of autonomously adjusting the cutting angle according to actual needs.

[0046] The lower wire rack body 4 is fixedly provided with a lower wire rack shaft sleeve 41 at one end close to the column 105, and the wire rack slide rod 8 is fixedly connected to the lower wire rack shaft sleeve 41. The upper wire rack shaft sleeve 71 is fixedly provided at one end of the upper wire rack body 7 close to the wire rack slide rod 8. The wire rack slide rod 8 passes through the upper wire rack shaft sleeve 71, and the upper wire rack shaft sleeve 71 is slidably provided along the length direction of the wire rack slide rod 8. The electrode wire follower assembly 9 includes an upper rotating shaft 72 rotatably connected to the upper wire rack body 7 and a lower rotating shaft 42 rotatably connected to the lower wire rack body 4. The upper rotating shaft 72 and the lower rotating shaft 42 are respectively equipped with an upper wire rack bearing 73 and a lower wire rack bearing 43. The ends of the upper rotating shaft 72 and the lower rotating shaft 42 are respectively fixed with an upper wire rack assembly 74 and a lower wire rack assembly 44. The upper wire rack assembly 74 and the lower wire rack assembly 44 are respectively hinged with an upper water spray plate 11 and a lower water spray plate 12. The upper water spray plate 11 is hinged with an upper wire rack connecting rod 111, and the lower water spray plate 12 is hinged with a lower wire rack connecting rod 121. The end of the upper wire rack connecting rod 111 is hinged. The upper wire rack shaft sleeve 71, the lower wire rack connecting rod 121 end is hinged to the lower wire rack shaft sleeve 41, the UV module 6 will do linear motion, which will drive the upper wire rack body 7 to do linear motion synchronously, and rotate along the hinge point at the end of the upper wire rack connecting rod 111 and the hinge point at the end of the lower wire rack connecting rod 121 together in the front and back directions, that is, the large taper connecting rod mechanism 10 moving along the parallelogram frame, the angle of movement of the UV module 6 will be transmitted to the electrode wire through the large taper connecting rod mechanism 10, and finally act on the electrode wire, so that The cutting angle of the workpiece changes, thereby achieving precise cutting of the taper. At the same time, since the upper wire rack connecting rod 111 is respectively hinged to the upper wire rack sleeve 71 and the upper water spray plate 11, and the lower wire rack connecting rod 121 is respectively hinged to the lower wire rack sleeve 41 and the lower water spray plate 12, when the large-taper connecting rod mechanism 10 moves, the upper wire rack connecting rod 111 and the lower wire rack connecting rod 121 will drive the upper water spray plate 11 and the lower water spray plate 12 to adaptively follow under the action of the parallelogram frame, thereby effectively adjusting the water spray angle.

[0047] The upper spray plate 11 and the lower spray plate 12 include a profile plate 13 that is hinged to the upper wire rack body 7 and the lower wire rack body 4. A rotating bearing 136 is provided between the profile plates 13. A hinge hole 131 is provided on both sides of the profile plate 13. A gem water nozzle 132 is fixedly provided at one end of the profile plate 13 away from the hinge point. The side of the gem water nozzle 132 is connected to a liquid cavity 133. The outer wall of the liquid cavity 133 is connected to a water inlet pipe joint 134 and Auxiliary water outlet 135, upper wire rack connecting rod 111 and lower wire rack connecting rod 121 are hinged to the liquid mold cavity 133. When in use, the electrode wire first passes through the rolling bearing and then passes through the gem water nozzle 132. The water inlet pipe joint 134 is externally connected to the working fluid circulation system. The working fluid flows through the liquid mold cavity 133. The hinge hole 131 is used for the hinge connection of the mold plate 13 and the upper wire rack body 7 or the lower wire rack body 4. Due to the existence of the electrode wire follower assembly 9, the upper water spray plate 11 and the lower water spray plate 12 The water spray angle will adaptively adjust to match the cutting angle conversion of the electrode wire. In large-taper wire cutting, the water spray part plays a key role. When the water spray operation is in progress, the upper wire rack connecting rod 111 moves synchronously with the movement of the UV module 6, and the connected water spray plate will naturally move along with it. The gem water nozzle 132 will always maintain the same angle with the electrode wire, and the axis of the gem water nozzle 132 is always parallel to the electrode wire. Therefore, it will not conflict with the edge of the gem water nozzle 132 for wire feeding, which can effectively avoid the hard friction between the electrode wire and the edge of the gem water nozzle 132 during taper cutting, reduce the wear of both, and effectively reduce the jitter of the electrode wire during processing, which can effectively improve the stability of the processing process, thereby improving the processing accuracy and the surface finish of the processing. The auxiliary water outlet 135 can also be additionally connected to a universal joint water pipe, which can freely adjust the water spray angle and position, further optimize the water spray effect, and thereby improve the accuracy and stability of large tapers.

[0048] The Z-axis lifting mechanism 5 includes a Z-axis slide rail 52 fixedly arranged on the outer wall of the column 105, the Z-axis slide rail 52 is slidably provided with a guide rail slider 53, the Z-axis slide 51 is equipped with a first drive motor 14 and a first screw 141 for positioning and rotating, the first screw 141 is fixedly arranged on the outer wall of the column 105 and one end is fixedly connected to the rotating shaft of the first drive motor 14, the first screw 141 is threadedly fitted to penetrate the guide rail slider 53, the Z-axis slide 51 is fixedly connected to the guide rail slider 53, the lower end of the Z-axis slide 51 is fixedly provided with an upper plate 142, and the upper plate 142 is provided with a UV slide rail 143 along the length direction of the upper wire rack body 7 The UV slide rail 143 is engaged and slidably provided with a UV slider 144, and the bottom wall of the UV slider 144 is fixedly installed with a middle plate 145. The UV module 6 is fixedly provided on the bottom wall of the middle plate 145. The bottom end of the UV module 6 is fixedly provided with a lower plate 146 fixedly connected to the upper wire rack body 7. The outer wall of the Z-axis slide 51 is fixedly provided with a second lead screw 15 for positioning and rotation and a second drive motor 151 for driving the second lead screw 15 to rotate. The second lead screw 15 is threadedly matched to penetrate the UV slider 144. When in use, the first drive motor 14 cooperates with the first lead screw 141 to control the rotation of the first lead screw 141 and control the guide rail slider 53 through thread matching. Sliding up and down, the guide rail slider 53 drives the Z-axis slide 51 to move up and down along the Z-axis slide 52. By controlling the number of rotations of the first drive motor 14, the up and down movement distance of the Z-axis slide 52 can be accurately controlled. Similarly, the second drive motor 151 cooperates with the second lead screw 15 to further accurately control the horizontal movement distance of the UV module 6. The first drive motor 14 has a built-in brake function to prevent the head from moving down after power failure. The Z-axis slide 51 is designed as a trapezoidal oblique rib frame casting structure to ensure high rigidity while reducing weight. When the Z-axis slide 51 moves upward through the guide rail slider 53, the upper wire rack body 7 is connected to the wire rack slide rod 8. During the traction movement, the Z-axis slide 51 will pull the guide rail slider 53 and the UV module 6 to pull the upper wire rack body 7 to move at the same time. Since they are at the same center, the error in the movement process will be reduced and the accuracy will not be affected. The UV module 6 has the function of adjusting the angle of the upper wire rack body 7 in the U and V axes. Since the upper wire rack body 7 is connected to the wire rack slide rod 8 through the upper wire rack shaft sleeve 71 and the upper wire rack assembly 74 and the lower wire rack assembly 44 are respectively rotatably connected to the upper wire rack body 7 and the lower wire rack body 4, the angle can be adaptively adjusted when the UV module 6 adjusts the U and V axes, thereby further improving the adjustable range of taper processing.

[0049] At the same time, the center positions of the upper wire rack body 7 and the lower wire rack body 4 are the same, and the accuracy during coordinated movement is relatively high, causing very small errors. The entire module can be operated smoothly, with small errors and stability. Overall, the Z-axis lifting mechanism 5 ensures sufficient rigidity during the movement of the Z, U, and V axes, thereby ensuring the accuracy and stability of cutting.

[0050] The wire-tensioning assembly 3 includes a wire-tensioning panel 31 fixedly mounted on the outer wall of the column 105. A guide wheel seat 32 is fixedly mounted on the outer wall of the top of the wire-tensioning panel 31. A vertical wire-tensioning slide rail 33 is provided in the center of the wire-tensioning panel 31. A heavy hammer slider group 34 is provided with a sliding engagement with the wire-tensioning slide rail 33. A limit mounting plate 35 is provided on the outer wall of the guide wheel seat 32. A wire-tensioning control bolt 36 is provided with a sliding engagement with the limit mounting plate 35. A pin hole 33 is provided on the outer wall of the heavy hammer slider group 34 for locking the wire-tensioning control bolt 36. 7. Elastic limit anti-collision blocks 38 are distributed on both sides of the bottom end of the wire-tensioning slide rail 33. The limit anti-collision blocks 38 are fixedly arranged on the outer wall of the wire-tensioning panel 31. The outer wall of the guide wheel seat 32 is fixedly installed with a first fixed guide wheel 39 and a second fixed guide wheel 391 located on both sides of the wire-tensioning slide rail 33. The outer wall of the heavy hammer slider group 34 is fixedly provided with a movable guide wheel 40 that cooperates with the first fixed guide wheel 39 and the second fixed guide wheel 391. When in use, the electrode wire passes through the first fixed guide wheel 39, the movable guide wheel 40 and the second fixed guide wheel in sequence. 391, reciprocating motion on the guide wheel group, by controlling the two states of locking and unlocking of the wire tensioning control bolt 36, the pre-hanging of the hammer slider group 34 can be achieved. After the operation is completed, the wire tensioning control bolt 36 is switched to another state to release the lock with the pin hole 37, so that the electrode wire can be naturally pulled by the hammer slider group 34, and it can play a buffering role, which can compensate for the tension loss caused by long-term use of the electrode wire and ensure the constant tension of the electrode wire. A limited anti-collision block 38 is provided under the wire tensioning panel 31. The limited anti-collision block 38 can prevent rigid collision and limit the position. The hammer slider group 34 moves linearly up and down on the wire tensioning panel 31 along the wire tensioning slide rail 33, ensuring that the direction of the electrode wire tension is always constant. The first fixed guide wheel 39, the second fixed guide wheel 391 and the movable guide wheel 40 are designed at a certain angle so that the electrode wire is always in a vertical state, so that the tension acting on the electrode wire by the hammer slider group 34 is always constant during the up and down movement of the heavy hammer slider group 34.

[0051] The large-taper connecting rod mechanism 10 is equipped with an electrode wire protection device 16. The electrode wire protection device 16 includes an upper water spray plate 11 and a lower water spray plate 12 that wrap the electrode wire. An upper wire rack water receiving tray 161 is connected to the lower portion of the upper wire rack body 7. A first water baffle 162 and a second water baffle 163 located on both sides of the UV module 6 are installed above the upper wire rack body 7. The first water baffle 162 is fixedly connected to the top wall of the upper wire rack, and the second water baffle 163 is slidably pushed and pulled on the outer wall of the UV module 6. The first water baffle 16 2 and the second water baffle 163 are set above the upper wire rack body 7, and the outer wall of the column 105 is provided with a wire expansion groove 164 for the wire expansion assembly 3 to be inserted and placed. The outer wall of the column 105 is hingedly provided with a wire expansion guard 165 covering the wire expansion groove 164. There is also a high-speed running electrode wire above the upper wire rack body 7, and the working fluid attached to it will also splash everywhere. The upper wire rack water tray 161 is located below it, which is responsible for collecting the dripping working fluid into the machine tool water tank, and then discharging it centrally, filtering it in the water tank and then recycling it. The water baffle 162 and the second water baffle 163 are located above the upper wire rack to prevent the working fluid from splashing around, effectively preventing other foreign matter from entering, avoiding affecting the operation of the electrode wire, ensuring the safety and stability of the wire cutting process, and at the same time preventing the working fluid attached to the high-speed moving electrode wire from splashing. The wire-raising guard plate 165 reserves an operation window for the wire-raising control device, and also uses a hinge to facilitate the opening and closing of the wire-raising guard plate 165 to completely wrap all the electrode wires. The second water baffle 163 is close to the end part of the upper wire rack body 7. Because the movement space here is limited and there is a UV module 6 above, it is designed to be a linear push-pull structure. Through the linear bearing assembly, it can achieve linear motion. When operations such as replacing the electrode wire need to be performed, it is only necessary to push the second water baffle 163 toward the UV module 6. At this time, the electrode wire will be exposed, which is convenient for operation. When the electrode wire is in normal cutting processing, the second water baffle 163 is pushed in the opposite direction to wrap the electrode wire as a whole, thereby achieving the purpose of protection and safety and environmental protection.

[0052] The wire transport assembly 2 includes a wire transport drum 17 , which is rotatably mounted on the top wall of the bed 1 , and an electrode wire is wound around the wire transport drum 17 .

[0053] Through the above technical solution, the electrode wire passes through the wire expansion assembly 3, the upper wire rack body 7 and the lower wire rack body 4 in sequence and then wraps around the wire roller 17, achieving a complete closed-loop reciprocating wire cutting effect on the workpiece.

[0054] The end of the wire rack slide rod 8 is movably connected to a positioning plate 18, which is fixed to the outer wall of the column 105. The bottom wall of the positioning plate 18 is an arc surface that matches the rotation angle of the wire rack slide rod 8. The arc surface is provided with a slide rail groove 181 along the length direction, and the slide rail groove 181 is provided with a fitting groove 182 on both sides of the length direction. The end of the wire rack slide rod 8 is fixed with a slider 183 that fits the slide rail groove 181, and the slider 183 is fixed on both sides with a fitting groove 18 2, a limit plate 185 covering one end of the slide rail groove 181 is detachably fixed to one side of the positioning plate 18, a limit block 186 covering the slide rail groove 181 is fixedly provided on the side of the positioning plate 18 away from the limit plate 185, and a hemispherical guide block 187 is fixedly provided on the side of the positioning plate 18 close to the limit plate 185. The guide blocks 187 are arranged in pairs, and the outer wall of the limit plate 185 is provided with a guide groove 188 that cooperates with the guide block 187.

[0055] By adopting the above technical solution, since the large-taper connecting rod mechanism 10 is fixedly installed at two points by means of the lower wire rack body 4 and the fixed connection UV module 6, during the movement process, due to the small number of fixed points and the fact that they are all movable connections, the overall structural strength and movement stability of the device are insufficient. During long-term use, the lifespan and stability are far inferior to those of the fixed installation structure. Therefore, the positioning plate 18 is added to the end of the wire rack slide rod 8. While allowing the wire rack slide rod 8 to move freely along a fixed angle, it also adds a movable connection point with the column 105, thereby effectively enhancing the movement stability of the large-taper connecting rod mechanism 10. When in use, the slider 183 at the end of the wire rack slide bar 8 cooperates with the slide bar 184 and the interlocking groove 182 as well as the slide rail groove 181, and rotates along the hinge point of the wire rack slide bar 8 and the lower wire rack body 4. The positioning plate 18 can effectively suppress the shaking of the large-taper connecting rod mechanism 10 in the lateral direction. The limit plate 185 is detachable. When removed, the slide rail groove 181 is completely exposed, which is convenient for the installation of the slider 183. When installing the limit plate 185, the limit plate 185 is pressed against the surface of the positioning plate 18, and the installation position is quickly found through the cooperation of the guide block 187 and the guide groove 188, and the installation is also more convenient.

[0056] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A novel precision medium-speed large-swing wire cutting machine tool, comprising a bed (1), wherein the bed (1) is equipped with a wire transport component (2), an XY axis transmission mechanism (101), a middle support plate (102), an upper support plate (103), a workpiece support frame (104) and a column (105), characterized in that: The side wall of the column (105) is fixedly provided with a wire tensioning assembly (3); the outer wall of the column (105) near one end of the bed (1) is fixedly provided with a lower wire rack body (4); the outer wall of the column (105) is fixedly provided with a Z-axis slide (51) that moves along the Z-axis and a Z-axis lifting mechanism (5) that drives the Z-axis slide (51) to move; the lower end of the Z-axis slide (51) is slidably provided with a UV module (6); the UV module (6) is fixedly connected with an upper wire rack body (7); the lower wire rack body (4) is fixedly provided with a Z-axis slide (51) that moves along the Z-axis. The end of the upper wire rack body (7) is rotatably connected to the wire rack slide rod (8), the end of the upper wire rack body (7) close to the column (105) is rotatably connected to the wire rack slide rod (8), the end of the upper wire rack body (7) and the lower wire rack body (4) away from the column (105) is rotatably installed with an electrode wire follower assembly (9), the upper wire rack body (7), the lower wire rack body (4) and the wire rack slide rod (8) are located in the same plane, and the upper wire rack body (7), the lower wire rack body (4) and the wire rack slide rod (8) form a large-taper connecting rod mechanism (10) with large-angle movement. The end of the wire rack slide rod (8) is movably connected to a positioning plate (18), and the positioning plate (18) is fixedly arranged on the outer wall of the column (105). The bottom wall of the positioning plate (18) is an arc surface that matches the rotation angle of the wire rack slide rod (8). The arc surface is provided with a slide rail groove (181) along the length direction, and the slide rail groove (181) is provided with a fitting groove (182) on both sides along the length direction. The end of the wire rack slide rod (8) is fixedly provided with a slider (183) that matches the slide rail groove (181), and the slider (183) is fixedly provided with fitting grooves (182) on both sides. 2) of the slide bar (184), a limiting plate (185) covering one end of the slide rail groove (181) is detachably fixed on one side of the positioning plate (18), a limiting block (186) covering the slide rail groove (181) is fixedly provided on the side of the positioning plate (18) away from the limiting plate (185), and a hemispherical guide block (187) is fixedly provided on the side of the positioning plate (18) close to the limiting plate (185), the guide blocks (187) are arranged in pairs, and a guide groove (188) cooperating with the guide block (187) is opened on the outer wall of the limiting plate (185).

2. The novel precision medium-speed large-swing wire-cutting machine tool according to claim 1 is characterized by: The lower wire rack body (4) is fixedly provided with a lower wire rack shaft sleeve (41) at one end close to the column (105), the wire rack slide rod (8) is fixedly connected to the lower wire rack shaft sleeve (41), the upper wire rack body (7) is fixedly provided with an upper wire rack shaft sleeve (71) at one end close to the wire rack slide rod (8), the wire rack slide rod (8) passes through the upper wire rack shaft sleeve (71), the upper wire rack shaft sleeve (71) is slidably provided along the length direction of the wire rack slide rod (8), the electrode wire follower assembly (9) includes an upper rotating shaft (72) rotatably connected to the upper wire rack body (7) and a lower rotating shaft (42) rotatably connected to the lower wire rack body (4), the upper rotating shaft (72) and the lower rotating shaft (42) are respectively An upper wire rack bearing (73) and a lower wire rack bearing (43) are provided in a matching manner. The ends of the upper rotating shaft (72) and the lower rotating shaft (42) are respectively fixedly provided with an upper wire rack assembly (74) and a lower wire rack assembly (44). The upper wire rack assembly (74) and the lower wire rack assembly (44) are respectively hingedly provided with an upper water spray plate (11) and a lower water spray plate (12). The upper water spray plate (11) is hingedly provided with an upper wire rack connecting rod (111), and the lower water spray plate (12) is hingedly provided with a lower wire rack connecting rod (121). The end of the upper wire rack connecting rod (111) is hingedly provided with an upper wire rack shaft sleeve (71), and the end of the lower wire rack connecting rod (121) is hingedly provided with a lower wire rack shaft sleeve (41).

3. The novel precision medium-speed large-swing wire-cutting machine tool according to claim 2 is characterized by: The upper water spray plate (11) and the lower water spray plate (12) include a shaped plate (13) that is hinged to the upper wire rack body (7) and the lower wire rack body (4), and a rotating bearing (136) is provided between the shaped plates (13) for rotation connection. A hinge hole (131) is provided through both sides of the shaped plate (13). A jewel water nozzle (132) is fixedly provided at one end of the shaped plate (13) away from the hinge point. The jewel water nozzle (132) is connected to the side of the liquid mold cavity (133). The outer wall of the liquid mold cavity (133) is connected to a water inlet pipe joint (134) and an auxiliary water outlet (135). The upper wire rack connecting rod (111) and the lower wire rack connecting rod (121) are hinged to the liquid mold cavity (133).

4. The novel precision medium-speed large-swing wire-cutting machine tool according to claim 1 is characterized by: The Z-axis lifting mechanism (5) includes a Z-axis slide rail (52) fixedly arranged on the outer wall of the column (105), the Z-axis slide rail (52) is slidably provided with a guide rail slider (53), the Z-axis slide ram (51) is matched with a first drive motor (14) and a first lead screw (141) for positioning and rotating, the first lead screw (141) is fixedly arranged on the outer wall of the column (105) and one end is fixedly connected to the rotating shaft of the first drive motor (14), the first lead screw (141) is threadedly matched to pass through the guide rail slider (53), the Z-axis slide ram (51) is fixedly connected to the guide rail slider (53), the lower end of the Z-axis slide ram (51) is fixedly provided with an upper plate (142), the The upper plate (142) is provided with a UV slide rail (143) along the length direction of the upper wire rack body (7), the UV slide rail (143) is engaged and slidably provided with a UV slider (144), the bottom wall of the UV slider (144) is fixedly installed with a middle plate (145), the UV module (6) is fixedly provided on the bottom wall of the middle plate (145), the bottom end of the UV module (6) is fixedly provided with a lower plate (146) fixedly connected to the upper wire rack body (7), the outer wall of the Z-axis slide (51) is fixedly provided with a second lead screw (15) for positioning and rotating and a second drive motor (151) for driving the second lead screw (15) to rotate, and the second lead screw (15) is threadedly fitted to pass through the UV slider (144).

5. The novel precision medium-speed large-swing wire-cutting machine tool according to claim 1 is characterized in that: The wire-raising assembly (3) comprises a wire-raising panel (31) fixedly arranged on the outer wall of the column (105); a guide wheel seat (32) is fixedly arranged on the outer wall of the top of the wire-raising panel (31); a vertical wire-raising slide rail (33) is provided in the center of the wire-raising panel (31); a heavy hammer slider group (34) is provided in a sliding manner in the wire-raising slide rail (33); a limit mounting plate (35) is extended from the outer wall of the guide wheel seat (32); a wire-raising control bolt (36) is slidably provided through the limit mounting plate (35); and a wire-raising control bolt (36) is provided on the outer wall of the heavy hammer slider group (34). There is a pin hole (37) for locking the wire tensioning control bolt (36), and elastic limiting anti-collision blocks (38) are distributed on both sides of the bottom end of the wire tensioning slide rail (33). The limiting anti-collision blocks (38) are fixedly arranged on the outer wall of the wire tensioning panel (31). The outer wall of the guide wheel seat (32) is fixedly installed with a first fixed guide wheel (39) and a second fixed guide wheel (391) located on both sides of the wire tensioning slide rail (33). The outer wall of the heavy hammer slider group (34) is fixedly provided with a movable guide wheel (40) that matches the first fixed guide wheel (39) and the second fixed guide wheel (391).

6. The novel precision medium-speed large-swing wire-cutting machine tool according to claim 3 is characterized by: The large-taper connecting rod mechanism (10) is equipped with an electrode wire protection device (16), and the electrode wire protection device (16) includes an upper water spray plate (11) and a lower water spray plate (12) that wrap the electrode wire. An upper wire rack water receiving tray (161) is spaced and connected below the upper wire rack body (7). A first water baffle (162) and a second water baffle (163) located on both sides of the UV module (6) are installed above the upper wire rack body (7). The first water baffle The plate (162) is fixedly connected to the top wall of the upper wire rack, the second water baffle (163) is slidably pushed and pulled on the outer wall of the UV module (6), the first water baffle (162) and the second water baffle (163) are arranged to cover the upper wire rack body (7), the outer wall of the column (105) is provided with a wire expansion groove (164) for the wire expansion assembly (3) to be inserted and placed, and the outer wall of the column (105) is hingedly provided with a wire expansion guard plate (165) covering the wire expansion groove (164).

7. The novel precision medium-speed large-swing wire-cutting machine tool according to claim 1 is characterized by: The wire transport assembly (2) comprises a wire transport drum (17), the wire transport drum (17) is rotatably mounted on the top wall of the bed (1), and the wire transport drum (17) is wound with an electrode wire.

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