Automatic wire threading device for medium-speed wire cutting

Abstract

The invention belongs to the technical field of wire cutting, and particularly relates to a medium-speed wire cutting automatic wire threading device which comprises a machine base, a machine table is installed at the left end of the machine base, a wire cylinder is installed at the left end of the machine table, and three third guide wheels installed at the upper end of the machine table are arranged behind the wire cylinder. The first guide wheel, the second guide wheel, the third guide wheel, the first tensioning wheel, the second tensioning wheel, the first wire feeding air cylinder, the second wire feeding air cylinder, the wire clamping air cylinder and the lead screw continuously provide conveying power for the silk yarn, the silk yarn moves on a workpiece at a constant speed, and therefore the unwound silk yarn and the wound silk yarn are wound outside the same silk cylinder at the same time. When the original part of the wire wound outside the wire cylinder is completely unwound, the wire cylinder rotates reversely, so that the direction of the movement track of the wire is changed, the wire can continuously cut a workpiece, the wire does not need to be manually threaded on the way, and the problems that an existing medium-speed wire cutting threading device needs to be manually threaded, efficiency is reduced, and cost is increased are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wire cutting, and particularly relates to an automatic wire threading device for medium-speed wire cutting. Background Art

[0002] Medium-speed wire electrical discharge machining (MS-WEDM) machines belong to the category of reciprocating high-speed wire electrical discharge machining machines. The workpiece and the wire are respectively connected to the positive and negative poles of direct current. When the thin wire approaches within one millimeter of the workpiece, the air between the workpiece and the wire is ionized, and the workpiece and the wire form a complete current loop. The medium-speed wire electrical discharge machining machine is used in conjunction with a wire threading device to move the thin wire. By cutting multiple times, the errors caused by material deformation and molybdenum wire loss are reduced, and the machining quality is between that of high-speed wire electrical discharge machining machines and low-speed wire electrical discharge machining machines.

[0003] Currently, the existing wire threading devices for medium-speed wire electrical discharge machining require manual wire threading. The speed of manual wire threading cannot keep up with the machining speed of the medium-speed wire electrical discharge machining machine for workpieces. During the machining process, workers spend most of their time performing manual wire threading operations. The technical actions of manual wire threading require high skills and long-term training, which reduces the machining efficiency and increases the machining cost. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and solve the problems of the existing wire threading device for medium-speed wire electrical discharge machining that requires manual wire threading, reduces efficiency, and increases costs.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an automatic wire threading device for medium-speed wire electrical discharge machining, including a machine base. A machine table is installed at the left end of the machine base, a wire cylinder is installed at the left end of the machine table, and three third guide wheels are installed at the upper end of the machine table behind the wire cylinder;

[0006] A first tensioning wheel is arranged to the right of the third guide wheel. A first guide tube is installed at the left end of the first tensioning wheel, and a first guide wheel is rotatably connected to the left end of the first guide tube;

[0007] A second guide tube is installed at the front end of the first tensioning wheel. A second guide wheel is rotatably connected to the rear end of the second guide tube, and a third guide tube is installed in front of the second guide tube;

[0008] A second tensioning wheel is arranged in front of the first tensioning wheel and installed at the rear end of the machine base. The third guide tube is installed behind the second tensioning wheel. A fourth guide tube is installed at the rear end of the machine base and installed at the left end of the second tensioning wheel;

[0009] The outer surface of the wire cylinder is wound with a wire. The head end of the wire sequentially passes through the inner sides of three third guide wheels, between two first guide wheels, inside the first guide tube, around the first tensioning wheel, inside the second guide tube, between two second guide wheels, inside the third guide tube, around the second tensioning wheel, inside the fourth guide tube and is wound around the outer surface of the wire cylinder again.

[0010] In a preferred technical solution of the present invention, a guide rail is installed behind the fourth guide tube, a lead screw is installed above the fourth guide tube, the power output end of the lead screw is drivingly connected to a wire clamping cylinder, the second tensioning wheel is installed at the right end of the wire clamping cylinder, the fourth guide tube is installed at the lower end of the wire clamping cylinder, and the guide rail is located below the lead screw.

[0011] In a preferred technical solution of the present invention, a first wire feeding cylinder is installed at the front end of the second guide tube, a second wire feeding cylinder installed at the rear end of the second tensioning wheel is arranged in front of the first wire feeding cylinder, and the second guide tube and the third guide tube are located on the same horizontal plane.

[0012] In a preferred technical solution of the present invention, a support platform located behind the machine base is arranged on the right side of the machine table, and the first tensioning wheel is installed at the front end of the support platform.

[0013] In a preferred technical solution of the present invention, a counterweight plate is rotatably connected to the lower end between the three third guide wheels, and the counterweight plate is installed at the upper end of the machine table.

[0014] In a preferred technical solution of the present invention, a sensor is installed in front of the left end of the fourth guide tube.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0016] By arranging a machine table at the left end of the machine base, installing a wire cylinder on the machine table, arranging three third guide wheels behind the wire cylinder, and sequentially arranging components such as the first tensioning wheel, the first guide tube, the first guide wheel, the second guide tube, the second guide wheel, the third guide tube, the second tensioning wheel, and the fourth guide tube, the wire can be wound and pass through each component along a specific path, ensuring that the wire can run stably and orderly during the cutting process, which is beneficial to improving the cutting accuracy and stability; for example, the head end of the wire sequentially passes through multiple components and is wound around the outer surface of the wire cylinder again. Such a path design can keep the wire under appropriate tension during the cutting process, avoiding the influence on the cutting quality caused by the slack of the wire; it has the effect of a reasonable and smooth wire path.

[0017] A guide rail is installed behind the fourth guide tube, a screw rod is installed on the top, the power output end of the screw rod is connected to the wire clamping cylinder, the second tensioning wheel is installed at the right end of the wire clamping cylinder, and the fourth guide tube is installed at the lower end of the wire clamping cylinder. Such a structural design can accurately adjust the relative position of the fourth guide tube and the second tensioning wheel through the screw rod and the wire clamping cylinder, so as to better control the direction and tension of the wire, and further improve the cutting accuracy and reliability; at the same time, the setting of the guide rail provides stable support and guidance for the movement of the wire clamping cylinder and other components, ensuring the accuracy of position adjustment; it has the effect of precise position adjustment and control;

[0018] The first wire feeding cylinder is installed at the front end of the second guide tube, and the second wire feeding cylinder is installed at the rear end of the second tensioning wheel. The second guide tube and the third guide tube are located at the same horizontal plane. The setting of the two wire feeding cylinders can provide stable power for the transmission of the wire, ensuring that the wire can smoothly pass through each guide tube and guide wheel as required, realizing the automatic wire threading and wire feeding function, so that the wire can continuously cut the workpiece clamped between the first wire feeding cylinder and the second wire feeding cylinder; the setting of the guide tubes at the same horizontal plane also facilitates the smooth passage of the wire, reducing the resistance and wear of the wire during the transmission process; it has the effect of stable wire feeding power;

[0019] A support platform is arranged on the right side of the machine behind the machine base, and the first tensioning wheel is installed at the front end of the support platform. This structural layout makes the installation positions of the components of the entire device more reasonable, and enhances the overall stability of the device; the support platform provides a reliable installation foundation for the first tensioning wheel and other components, which helps to ensure the relative position stability of the components during the operation of the wire, thereby improving the working performance of the device; it has the effect of reasonable and stable structural layout;

[0020] The lower ends of the three third guide wheels are rotatably connected to a counterweight plate, which is installed on the upper end of the machine platform. The counterweight plate can automatically adjust its position according to the change of the tension of the wire, so as to adjust the tension of the wire, so that the wire can maintain appropriate tension during the cutting process and improve the cutting quality. For example, when the tension of the wire changes, the counterweight plate can rotate under the action of gravity, so as to apply a certain pulling force or pressure to the wire, maintain the stability of the wire tension, and have the effect of automatically stretching the wire.

[0021] A sensor is installed in front of the left end of the fourth guide tube, which can monitor the status of the wire in real time, such as whether the wire is broken, whether it deviates from the normal path, etc. Once an abnormal situation is detected, a signal can be sent in time so that the operator can take corresponding measures to avoid accidents in the cutting process caused by wire problems, thereby improving the reliability and safety of the device; it has the effect of real-time monitoring of the wire status;

[0022] After the silk thread is unreeled from the inside of the silk bobbin, the head end of the silk thread successively passes through the inner sides of three third guide wheels, between two first guide wheels, inside the first guide tube, around the first tension wheel, inside the second guide tube, between two second guide wheels, inside the third guide tube, around the second tension wheel, inside the fourth guide tube. The first guide wheel, the second guide wheel, the third guide wheel, the first tension wheel, the second tension wheel, the first wire feeding cylinder, the second wire feeding cylinder, the wire clamping cylinder, and the lead screw continuously provide the driving force for the transmission of the silk thread. The silk thread moves uniformly on the workpiece, and the tail end of the silk thread is re-wound at another position on the outer surface of the same silk bobbin. Then, the silk bobbin rotates in reverse to change the direction of the movement track of the silk thread, so that the silk thread can continuously cut the workpiece without manually threading the silk thread again during the process. This is beneficial to improving the processing efficiency, reducing the cost, and at the same time, it has relatively low requirements for the technical operation of workers and low difficulty in the operation training of workers. Brief Description of the Drawings

[0023] Figure 1 Is a three-dimensional view of the left part of the whole of the present invention;

[0024] Figure 2 Is a three-dimensional view of the right part of the whole of the present invention;

[0025] Figure 3 Is a top view of the overall structure of the present invention;

[0026] Figure 4 Is a partially enlarged view of Structure A of the present invention;

[0027] Figure 5 Is a partially enlarged view of Structure B of the present invention;

[0028] Figure 6 Is a partially enlarged view of Structure C of the present invention;

[0029] Figure 7 Is a partially enlarged view of Structure D of the present invention;

[0030] Figure 8 Is a partially enlarged view of Structure E of the present invention.

[0031] In the figure: 1, machine base; 2, machine table; 3, silk bobbin; 4, support table; 5, silk thread; 6, first wire feeding cylinder; 7, second wire feeding cylinder; 8, second guide tube; 9, third guide tube; 10, second guide wheel; 11, wire clamping cylinder; 12, first guide tube; 13, first guide wheel; 14, fourth guide tube; 15, sensor; 16, guide rail; 17, lead screw; 18, counterweight plate; 19, third guide wheel; 20, first tension wheel; 21, second tension wheel. Detailed Description of the Invention

[0032] Please refer to Figure 1-8, the present invention provides a technical solution: a middle-wire electrical discharge wire-cutting automatic wire threading device, including a machine base 1. A machine table 2 is installed at the left end of the machine base 1, and a wire drum 3 is installed at the left end of the machine table 2. There are three third guide wheels 19 installed at the upper end of the machine table 2 behind the wire drum 3; a first tension wheel 20 is arranged to the right of the third guide wheel 19. A first guide tube 12 is installed at the left end of the first tension wheel 20, and a first guide wheel 13 is rotatably connected to the left end of the first guide tube 12; a second guide tube 8 is installed at the front end of the first tension wheel 20. A second guide wheel 10 is rotatably connected to the rear end of the second guide tube 8, and a third guide tube 9 is installed in front of the second guide tube 8; a second tension wheel 21 installed at the rear end of the machine base 1 is arranged in front of the first tension wheel 20. The third guide tube 9 is installed behind the second tension wheel 21, and a fourth guide tube 14 is installed at the rear end of the machine base 1. The fourth guide tube 14 is installed at the left end of the second tension wheel 21; a wire 5 is wound around the outer surface of the wire drum 3. The head end of the wire 5 sequentially passes through the inner sides of the three third guide wheels 19, between the two first guide wheels 13, the inside of the first guide tube 12, around the first tension wheel 20, the inside of the second guide tube 8, between the two second guide wheels 10, the inside of the third guide tube 9, around the second tension wheel 21, and the inside of the fourth guide tube 14 and is wound around the outer surface of the wire drum 3 again; a guide rail 16 is installed behind the fourth guide tube 14, and a lead screw 17 is installed above the fourth guide tube 14. The power output end of the lead screw 17 is drivingly connected to a wire clamping cylinder 11. The second tension wheel 21 is installed at the right end of the wire clamping cylinder 11, and the fourth guide tube 14 is installed at the lower end of the wire clamping cylinder 11. The guide rail 16 is located below the lead screw 17; a first wire feeding cylinder 6 is installed at the front end of the second guide tube 8. A second wire feeding cylinder 7 installed at the rear end of the second tension wheel 21 is arranged in front of the first wire feeding cylinder 6. The second guide tube 8 and the third guide tube 9 are located on the same horizontal plane; a support table 4 located behind the machine base 1 is arranged to the right of the machine table 2. The first tension wheel 20 is installed at the front end of the support table 4; a counterweight plate 18 is rotatably connected to the lower end between the three third guide wheels 19. The counterweight plate 18 is installed at the upper end of the machine table 2;Place the whole machine stably on the ground so that the machine base 1, the machine table 2 and the support table 4 are in a stable placement state. The contours between the machine base 1, the machine table 2 and the support table 4 present a rectangular distribution state. Wind the wire 5 around one side inside the wire spool 3 in advance, and leave a blank position on the other side of the surface of the wire spool 3 for winding the wire 5. The wire 5 is released from the surface of the wire spool 3 and presents a "V"-shaped wire routing track between the three third guide wheels 19. The three third guide wheels 19 stretch and straighten the wire 5. Inside the first guide tube 12, the wire 5 moves to the right. The wire 5 passes through the first guide tube 12 and reaches the surface of the first middle tension wheel. The tension wheel is enclosed in a container in the shape of a rectangular box (there are small holes on the outside of the container for accommodating the movement of the wire 5). Since the tension wheel rotates counterclockwise as the wire 5 moves to the right, the wire 5 deflects counterclockwise by ninety degrees along the tension wheel. The wire 5 makes a ninety-degree turn inside the container. The wire 5 extends from the front end of the container and penetrates into the second guide tube 8. The wire 5 passes out from the front end of the second guide tube 8. Clamp the workpiece in advance at the position between the second guide tube 8 and the third guide tube 9 (the workpiece is pre-drilled with a through hole for accommodating the wire 5 to pass through). The wire 5 passes through the hole on the surface of the workpiece and continuously penetrates forward along the hole into the third guide tube 9. The wire 5 penetrates forward in the third guide tube 9 to the periphery of the second tension wheel 21. The wire 5 drives the second tension wheel 21 to rotate. The working principle of the second tension wheel 21 is the same as that of the first tension wheel 20. The wire 5 deflects ninety degrees along the second tension wheel 21. The wire 5 changes from moving from back to front to moving from right to left. The wire 5 penetrates into the fourth guide tube 14. The wire 5 moves from right to left inside the fourth guide tube 14. The wire 5 is gradually wound by the other side of the outer surface of the wire spool 3, so that the wire 5 will be automatically wound on the other side after being unwound along the wire spool 3, realizing the effect of automatic wire feeding and wire walking.;

[0033] By setting the machine table 2 at the left end of the machine base 1, installing the wire spool 3 on the machine table 2, arranging three third guide wheels 19 behind the wire spool 3, and successively arranging components such as the first tension wheel 20, the first guide tube 12, the first guide wheel 13, the second guide tube 8, the second guide wheel 10, the third guide tube 9, the second tension wheel 21, and the fourth guide tube 14, the wire 5 can be wound and passed through each component along a specific path, ensuring that the wire 5 can run stably and orderly during the cutting process, which is beneficial to improving the cutting accuracy and stability; for example, the head end of the wire 5 passes through multiple components in sequence and winds around the outer surface of the wire spool 3 again. Such a path design can keep the wire 5 under appropriate tension during the cutting process, avoiding the influence on the cutting quality caused by the slack of the wire 5, and having the effect of keeping the path of the wire 5 reasonable and smooth.

[0034] A guide rail 16 is installed behind the fourth guide tube 14, and a lead screw 17 is installed above it. The power output end of the lead screw 17 is drivingly connected to a wire clamping cylinder 11. The second tension pulley 21 is installed at the right end of the wire clamping cylinder 11, and the fourth guide tube 14 is installed at the lower end of the wire clamping cylinder 11. Such a structural design can precisely adjust the relative positions of the fourth guide tube 14 and the second tension pulley 21 through the lead screw 17 and the wire clamping cylinder 11, thereby better controlling the path and tension of the wire 5, further improving the cutting accuracy and reliability. At the same time, the setting of the guide rail 16 provides stable support and guidance for the movement of components such as the wire clamping cylinder 11, ensuring the accuracy of position adjustment.

[0035] A first wire feeding cylinder 6 is installed at the front end of the second guide tube 8, and a second wire feeding cylinder 7 is installed at the rear end of the second tension pulley 21. Moreover, the second guide tube 8 and the third guide tube 9 are located on the same horizontal plane. The setting of the two wire feeding cylinders can provide stable power for the conveyance of the wire 5, ensuring that the wire 5 can smoothly pass through each guide tube and guide pulley as required, realizing the function of automatic wire threading and feeding, and enabling the wire 5 to continuously perform cutting processing on the workpiece clamped between the first wire feeding cylinder 6 and the second wire feeding cylinder 7. The setting of the guide tubes on the same horizontal plane also helps the wire 5 to pass smoothly, reducing the resistance and wear of the wire 5 during the transmission process.

[0036] A support table 4 located behind the machine base 1 is set on the right side of the machine table 2, and the first tension pulley 20 is installed at the front end of the support table 4. Such a structural layout makes the installation positions of the components of the entire device more reasonable, enhancing the overall stability of the device. The support table 4 provides a reliable installation foundation for components such as the first tension pulley 20, helping to ensure the relative positions of the components during the operation of the wire 5 are stable, thereby improving the working performance of the device.

[0037] A counterweight plate 18 is rotatably connected to the lower ends between the three third guide pulleys 19, and the counterweight plate 18 is installed at the upper end of the machine table 2. The setting of the counterweight plate 18 can automatically adjust its position according to the change in the tension of the wire 5, playing a role in adjusting the tension of the wire 5, so that the wire 5 maintains an appropriate tension during the cutting process, improving the cutting quality. For example, when the tension of the wire 5 changes, the counterweight plate 18 can rotate under the action of gravity, thereby exerting a certain pulling force or pressure on the wire 5 to maintain the stability of the tension of the wire 5.

[0038] A sensor 15 is installed in front of the left end of the fourth guide tube 14. The sensor 15 can real-time monitor the state of the wire 5, such as whether the wire 5 is broken or deviates from the normal path, etc. Once an abnormal situation is detected, a signal can be sent in time so that the operator can take corresponding measures to avoid accidents during the cutting work caused by problems with the wire 5, improving the reliability and safety of the device.

[0039] Considering the above effects, after the wire 5 is unrolled from the inside of the wire reel 3, the head end of the wire 5 sequentially passes through the inside of three third guide wheels 19, between two first guide wheels 13, inside the first guide tube 12, around the periphery of the first tensioning wheel 20, inside the second guide tube 8, between two second guide wheels 10, inside the third guide tube 9, around the periphery of the second tensioning wheel 21, inside the fourth guide tube 14. The first guide wheel 13, the second guide wheel 10, the third guide wheel 19, the first tensioning wheel 20, the second tensioning wheel 21, the first wire feeding cylinder 6, the second wire feeding cylinder 7, the wire clamping cylinder 11, and the lead screw 17 continuously provide the driving force for the transmission of the wire 5. The wire 5 moves uniformly on the workpiece. The tail end of the wire 5 is re-wound at another position on the outer surface of the same wire reel 3, so that the unrolled wire 5 and the rewound wire 5 are both wound around the outside of the same wire reel 3. When the originally wound part of the wire 5 on the outside of the wire reel 3 is completely unrolled, then the wire reel 3 rotates in reverse to change the direction of the movement trajectory of the wire 5, so that the wire 5 can continuously cut the workpiece without manually threading the wire 5 again during the process. This is beneficial to improving the processing efficiency, reducing the cost, and at the same time has relatively low requirements for the technical operation of workers and low difficulty in the operation training of workers.

Claims

1. An automatic wire threading device for middle-speed wire cutting, comprising a machine base (1), characterized in that: A machine table (2) is installed at the left end of the machine base (1), a wire drum (3) is installed at the left end of the machine table (2), and three third guide wheels (19) are arranged behind the wire drum (3) and installed at the upper end of the machine table (2); A first tensioning wheel (20) is arranged to the right of the third guide wheel (19), a first guide tube (12) is installed at the left end of the first tensioning wheel (20), and a first guide wheel (13) is rotatably connected to the left end of the first guide tube (12); A second guide tube (8) is installed at the front end of the first tensioning wheel (20), a second guide wheel (10) is rotatably connected to the rear end of the second guide tube (8), and a third guide tube (9) is installed in front of the second guide tube (8); A second tensioning wheel (21) installed at the rear end of the machine base (1) is arranged in front of the first tensioning wheel (20), the third guide tube (9) is installed behind the second tensioning wheel (21), a fourth guide tube (14) is installed at the rear end of the machine base (1), and the fourth guide tube (14) is installed at the left end of the second tensioning wheel (21); A wire (5) is wound around the outer surface of the wire drum (3), and the head end of the wire (5) sequentially passes through the inner sides of the three third guide wheels (19), between the two first guide wheels (13), the inside of the first guide tube (12), the periphery of the first tensioning wheel (20), the inside of the second guide tube (8), between the two second guide wheels (10), the inside of the third guide tube (9), the periphery of the second tensioning wheel (21), and the inside of the fourth guide tube (14) and is wound around the outer surface of the wire drum (3) again.

2. The automatic wire threading device for middle-speed wire cutting according to claim 1, characterized in that: A guide rail (16) is installed behind the fourth guide tube (14), a lead screw (17) is installed above the fourth guide tube (14), the power output end of the lead screw (17) is drivingly connected to a wire clamping cylinder (11), the second tensioning wheel (21) is installed at the right end of the wire clamping cylinder (11), the fourth guide tube (14) is installed at the lower end of the wire clamping cylinder (11), and the guide rail (16) is located below the lead screw (17).

3. The automatic wire threading device for middle-speed wire electrical discharge machining according to claim 1, characterized in that: A first wire feeding cylinder (6) is installed at the front end of the second guide tube (8), a second wire feeding cylinder (7) installed at the rear end of the second tensioning wheel (21) is arranged in front of the first wire feeding cylinder (6), and the second guide tube (8) and the third guide tube (9) are on the same horizontal plane.

4. The automatic wire threading device for middle-speed wire cutting according to claim 1, wherein: A support table (4) located behind the machine base (1) is arranged to the right of the machine table (2), and the first tensioning wheel (20) is installed at the front end of the support table (4).

5. The automatic wire threading device for middle-speed wire cutting according to claim 1, characterized in that: A counterweight plate (18) is rotatably connected to the lower end between the three third guide wheels (19), and the counterweight plate (18) is installed at the upper end of the machine table (2).

6. The automatic wire threading device for middle-speed wire cutting according to claim 1, characterized in that: A sensor (15) is installed in front of the left end of the fourth guide tube (14).

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