Automatic wire threading device for medium-speed wire cutting

Abstract

The utility model belongs to the technical field of wire cutting, and particularly relates to a medium-speed wire cutting automatic 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] This utility model belongs to the field of wire cutting technology, and in particular relates to an automatic wire threading device for medium-speed wire cutting. Background Technology

[0002] The medium-speed wire EDM (MS-WEDM) belongs to the category of reciprocating high-speed wire EDM machines. The workpiece and the wire are connected to the positive and negative terminals of a DC power supply, respectively. The fine wire is 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 EDM machine is used in conjunction with a wire threading device to move the fine wire. Through multiple cuts, the errors caused by material deformation and molybdenum wire wear are reduced, so that the processing quality is between that of high-speed wire EDM and low-speed wire EDM.

[0003] Currently available wire EDM threading devices require manual threading. The speed of manual threading cannot keep up with the speed at which the wire EDM machine processes the workpiece. During the processing, workers spend most of their time performing manual threading actions. The manual threading technique requires high skill and long-term training, which reduces processing efficiency and increases processing costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and solve the problems of existing medium-speed wire cutting wire threading devices requiring manual wire threading, reducing efficiency and increasing cost.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an automatic wire threading device for medium-speed wire cutting, including a machine base, a machine platform installed at the left end of the machine base, a wire spool installed at the left end of the machine platform, and three third guide wheels installed at the upper part of the machine platform behind the wire spool.

[0006] A first tensioning wheel is provided to the right of the third guide wheel, and a first guide tube is installed on the left end of the first tensioning wheel. The 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 installed in front of the first tensioning wheel and 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 at the left end of the second tensioning wheel.

[0009] The outer surface of the spool is wound with a thread, and the end of the thread passes through the inner side of the three third guide wheels, between the two first guide wheels, inside the first guide tube, outside the first tension wheel, inside the second guide tube, between the two second guide wheels, inside the third guide tube, outside the second tension wheel, and inside the fourth guide tube in sequence, and is then rewound to the outer surface of the spool.

[0010] In a preferred embodiment of this invention, a guide rail is installed behind the fourth guide tube, a lead screw is installed above the fourth guide tube, a wire clamping cylinder is connected to the power output end of the lead screw, 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 embodiment of this invention, a first wire feeding cylinder is installed at the front end of the second guide tube, and a second wire feeding cylinder is installed at the rear end of the second tensioning wheel in front of the first wire feeding cylinder. The second guide tube and the third guide tube are located on the same horizontal plane.

[0012] In a preferred embodiment of this invention, a support platform is provided on the right side of the machine base behind the machine base, and the first tensioning wheel is installed at the front end of the support platform.

[0013] In a preferred embodiment of this invention, a counterweight plate is rotatably connected to the lower end of each of the three third guide wheels, and the counterweight plate is mounted on the upper end of the machine platform.

[0014] In a preferred embodiment of this invention, a sensor is installed at the front left end of the fourth guide tube.

[0015] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0016] By setting a machine platform at the left end of the machine base, mounting a wire spool on the platform, and placing three third guide rollers behind the spool, along with components arranged sequentially such as a first tension roller, a first guide tube, a first guide roller, a second guide tube, a second guide roller, a third guide tube, a second tension roller, and a fourth guide tube, the wire can wind and pass through each component along a specific path. This ensures stable and orderly wire movement during the cutting process, improving cutting accuracy and stability. For example, the wire tip passes through multiple components sequentially and rewinds around the outer surface of the spool. This path design maintains appropriate tension in the wire during cutting, preventing slack from affecting cutting quality and resulting in a smooth and efficient wire path.

[0017] A guide rail is installed behind the fourth guide tube, and a lead screw is installed above it. The power output end of the lead screw is connected to a wire clamping cylinder. The second tension 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. This structural design allows for precise adjustment of the relative position of the fourth guide tube and the second tension wheel through the lead screw and the wire clamping cylinder, thereby better controlling the direction and tension of the wire and further improving the cutting accuracy and reliability. At the same time, the guide rail provides stable support and guidance for the movement of components such as the wire clamping cylinder, ensuring the accuracy of position adjustment; thus, 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 and third guide tubes are located on the same horizontal plane. The two wire feeding cylinders provide stable power for wire feeding, ensuring that the wire can pass smoothly through each guide tube and guide wheel as required, realizing automatic wire threading and feeding function, and enabling the wire to continuously cut and process the workpiece clamped between the first and second wire feeding cylinders. The guide tubes on the same horizontal plane also help the wire pass smoothly, reducing resistance and wear during the transmission process, and providing stable wire feeding power.

[0019] A support platform is located on the right side of the machine base, behind the machine base. The first tensioning roller is installed at the front end of the support platform. This structural layout makes the installation positions of the various 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 roller and other components, which helps to ensure the relative position stability of the various 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] A counterweight plate is rotatably connected to the lower end of the three third guide wheels. The counterweight plate is installed on the upper part of the machine platform. The position of the counterweight plate can be automatically adjusted according to the tension change of the wire, so as to regulate the wire tension and maintain appropriate tension during the cutting process, thereby improving the cutting quality. For example, when the wire tension changes, the counterweight plate can rotate under the action of gravity, thereby applying a certain tension or pressure to the wire, maintaining the stability of the wire tension, and having an automatic wire stretching effect.

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

[0022] After the wire is unwound from the spool, the wire end passes sequentially through the inner sides of three third guide rollers, between two first guide rollers, inside the first guide tube, outside the first tension roller, inside the second guide tube, between two second guide rollers, inside the third guide tube, outside the second tension roller, and inside the fourth guide tube. The first guide roller, second guide roller, third guide roller, first tension roller, second tension roller, first wire feeding cylinder, second wire feeding cylinder, wire clamping cylinder, and lead screw continuously provide power for the wire. The wire moves at a uniform speed on the workpiece. The wire end is rewound to another position on the outer surface of the same spool. Then the spool reverses, changing the direction of the wire's movement trajectory. This allows the wire to continuously cut the workpiece without the need for manual re-threading along the way, which improves processing efficiency, reduces costs, and also requires less technical skill from workers, making worker training easier. Attached Figure Description

[0023] Figure 1 This is a perspective view of the left side of the entire utility model;

[0024] Figure 2 This is a perspective view of the right side of the entire utility model;

[0025] Figure 3 This is a top view of the overall structure of this utility model;

[0026] Figure 4 This is a partial enlarged view of structure A of this utility model;

[0027] Figure 5 This is a partial enlarged view of structure B of this utility model;

[0028] Figure 6 This is a partial enlarged view of structure C of this utility model;

[0029] Figure 7 This is a partial enlarged view of the structure D of this utility model;

[0030] Figure 8 This is a partial enlarged view of the structure E of this utility model.

[0031] In the diagram: 1. Machine base; 2. Machine platform; 3. Wire drum; 4. Support platform; 5. Wire; 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 tensioning wheel; 21. Second tensioning wheel. Detailed Implementation

[0032] Please see Figure 1-8This utility model provides a technical solution: an automatic wire threading device for medium-speed wire cutting, including a base 1, a machine platform 2 mounted on the left end of the base 1, a wire spool 3 mounted on the left end of the machine platform 2, three third guide wheels 19 mounted on the upper part of the machine platform 2 behind the wire spool 3; a first tensioning wheel 20 is mounted to the right of the third guide wheels 19, a first guide tube 12 is mounted on 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 mounted on the front end of the first tensioning wheel 20. The second guide tube 8 is rotatably connected to the rear end of the second guide tube 10, and a third guide tube 9 is installed in front of the second guide tube 8; a second tensioning wheel 21 is installed in front of the first tensioning wheel 20 and at the rear end of the machine base 1, and 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 is installed at the left end of the second tensioning wheel 21; a wire 5 is wound on the outer surface of the wire drum 3, and the ends of the wire 5 pass through the inner sides of the three third guide wheels 19 and between the two first guide wheels 13 in sequence. The wire is wound inside the first guide tube 12, around the first tensioning wheel 20, inside the second guide tube 8, between the two second guide wheels 10, inside the third guide tube 9, around the second tensioning wheel 21, and inside the fourth guide tube 14, and then rewound to the outer surface of the wire drum 3. 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 connected to a wire clamping cylinder 11. The second tensioning wheel 21 is installed at the right end of the wire clamping cylinder 11, and the fourth guide tube 14 is installed on the wire clamping cylinder. At the lower end of cylinder 11, guide rail 16 is located below lead screw 17; 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 wheel 21 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 platform 4 is located behind the machine base 1 on the right side of the machine base 2, and the first tension wheel 20 is installed at the front end of the support platform 4; a counterweight plate 18 is rotatably connected at the lower end between the three third guide wheels 19, and the counterweight plate 18 is installed at the upper end of the machine base 2;Place the entire machine stably on the ground, ensuring that the base 1, machine platform 2, and support platform 4 are in a stable position. The outlines of the base 1, machine platform 2, and support platform 4 form a rectangular distribution. Pre-wrap the wire 5 inside one side of the wire drum 3, leaving a blank space on the other side of the wire drum 3 for winding the wire 5. The wire 5 is released from the surface of the wire drum 3 and follows a "V"-shaped trajectory between the three third guide rollers 19. The three third guide rollers 19 stretch and straighten the wire. Inside the first guide tube 12, the wire 5 moves to the right, passing through the first guide tube 12 and onto the surface of the first tensioning roller. The tensioning roller is sealed inside a rectangular box-shaped container (the outside of which has small holes for accommodating the movement of the wire 5). As the tensioning roller rotates counterclockwise with the wire 5 moving to the right, the wire 5 deflects 90 degrees counterclockwise along the tensioning roller. The wire 5 makes a 90-degree turn inside the container, extending from the front end of the container and passing through... Inside the second guide tube 8, the wire 5 emerges from the front end of the second guide tube 8. The workpiece is pre-clamped between the second guide tube 8 and the third guide tube 9 (the workpiece has a pre-drilled through hole to accommodate the wire 5). The wire 5 passes through the hole on the surface of the workpiece and continues forward along the hole into the third guide tube 9. The wire 5 then passes forward through the third guide tube 9 to the outer periphery of the second tensioning wheel 21, causing the second tensioning wheel 21 to rotate. The working principle of the second tensioning wheel 21 is the same as that of the first tensioning wheel 20. The wire 5 deflects 90 degrees along the second tensioning wheel 21, changing its movement from back to front to right to left. The wire 5 then enters the fourth guide tube 14 and moves out from right to left inside the fourth guide tube 14. The wire 5 is gradually wound up on the other side of the outer surface of the wire drum 3, so that after the wire 5 is unwound along the wire drum 3, it is automatically wound up on the other side, achieving the effect of automatic wire feeding.

[0033] By setting a machine base 2 at the left end of the machine base 1, mounting a wire drum 3 on the machine base 2, and setting three third guide rollers 19 behind the wire drum 3, as well as components such as a first tension roller 20, a first guide tube 12, a first guide roller 13, a second guide tube 8, a second guide roller 10, a third guide tube 9, a second tension roller 21, and a fourth guide tube 14 arranged in sequence, the wire 5 can be wound and passed through each component along a specific path. This ensures 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 is re-wound with the outer surface of the wire drum 3. This path design allows the wire 5 to maintain appropriate tension during the cutting process, avoiding the wire 5 from becoming loose and affecting the cutting quality. It also has the function 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 connected to the 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. This structural design allows for precise adjustment of the relative position of the fourth guide tube 14 and the second tension wheel 21 through the lead screw 17 and the wire clamping cylinder 11, thereby better controlling the direction and tension of the wire 5 and further improving the cutting accuracy and reliability. At the same time, 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] The first wire feeding cylinder 6 is installed at the front end of the second guide tube 8, and the second wire feeding cylinder 7 is installed at the rear end of the second tensioning wheel 21. 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 feeding of the wire 5, ensuring that the wire 5 can pass smoothly through each guide tube and guide wheel as required, realizing the automatic wire threading and feeding function, so that the wire 5 can continuously cut and process 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 platform 4 is located on the right side of the machine base 2, behind the machine base 1. The first tensioning wheel 20 is installed at the front end of the support platform 4. This structural layout makes the installation positions of the various components of the entire device more reasonable and enhances the overall stability of the device. The support platform 4 provides a reliable installation base for the first tensioning wheel 20 and other components, which helps to ensure the relative position stability of the various components of the wire 5 during operation, thereby improving the working performance of the device.

[0037] The lower ends of the three third guide wheels 19 are rotatably connected to a counterweight plate 18. The counterweight plate 18 is installed on the upper end of the machine base 2. The counterweight plate 18 can automatically adjust its position according to the tension change of the wire 5, so as to regulate the tension of the wire 5, maintain the appropriate tension of the wire 5 during the cutting process, and improve 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 applying a certain tension or pressure to the wire 5 and maintaining the stability of the tension of the wire 5.

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

[0039] In summary, after the wire 5 is unwound from the spool 3, its end passes sequentially through the inner sides of three third guide rollers 19, between two first guide rollers 13, inside the first guide tube 12, outside the first tension roller 20, inside the second guide tube 8, between two second guide rollers 10, inside the third guide tube 9, outside the second tension roller 21, and inside the fourth guide tube 14. The first guide roller 13, second guide roller 10, third guide roller 19, first tension roller 20, second tension roller 21, first wire feeding cylinder 6, second wire feeding cylinder 7, wire clamping cylinder 11, and lead screw 17 continuously feed the wire 5. The power source provides the transmission, and the wire 5 moves at a constant speed on the workpiece. The tail end of the wire 5 is rewound to another position on the outer surface of the same wire drum 3, so that the unwound wire 5 and the rewound wire 5 are simultaneously wound around the outside of the same wire drum 3. After the original part of the wire 5 wound around the outside of the wire drum 3 is completely unwound, the wire drum 3 reverses, causing the movement trajectory of the wire 5 to change direction. This allows the wire 5 to continuously cut the workpiece without the need for manual re-threading of the wire 5 along the way, which helps to improve processing efficiency, reduce costs, and also requires less technical operation skills from workers, making worker training easier.

Claims

1. A medium-wire wire cutting automatic threading device, comprising a base (1), characterized in that: a machine table (2) is installed at the left end of the 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 on 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 pipe (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 pipe (12). A second guide pipe (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 pipe (8), and a third guide pipe (9) is installed in front of the second guide pipe (8). A second tensioning wheel (21) is installed at the rear end of the base (1) and arranged in front of the first tensioning wheel (20), the third guide pipe (9) is installed behind the second tensioning wheel (21), a fourth guide pipe (14) is installed at the rear end of the base (1) and arranged at the left end of the second tensioning 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 side of the three third guide wheels (19), between the two first guide wheels (13), the inside of the first guide pipe (12), the periphery of the first tensioning wheel (20), the inside of the second guide pipe (8), between the two second guide wheels (10), the inside of the third guide pipe (9), the periphery of the second tensioning wheel (21), the inside of the fourth guide pipe (14), and is re-wound around the outer surface of the wire drum (3). A guide rail (16) is installed behind the fourth guide pipe (14), a lead screw (17) is installed above the fourth guide pipe (14), a wire clamping cylinder (11) is drivingly connected to the power output end of the lead screw (17), the second tensioning wheel (21) is installed at the right end of the wire clamping cylinder (11), the fourth guide pipe (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).

2. An automatic wire threading device for medium speed wire electrical discharge machining as claimed in claim 1, characterized in that: A first wire feeding cylinder (6) is installed at the front end of the second guide pipe (8), a second wire feeding cylinder (7) is arranged in front of the first wire feeding cylinder (6) and installed at the rear end of the second tensioning wheel (21), and the second guide pipe (8) and the third guide pipe (9) are located in the same horizontal plane.

3. An automatic wire threading device for medium speed wire electrical discharge machining as claimed in claim 1, characterized in that: A supporting table (4) is arranged behind the base (1) and to the right of the machine table (2), and the first tensioning wheel (20) is installed at the front end of the supporting table (4).

4. An automatic wire threading device for medium speed wire electrical discharge machining as claimed in claim 1, wherein: A counterweight plate (18) is rotatably connected between the lower ends of the three third guide wheels (19) and installed on the upper end of the machine table (2).

5. An automatic wire threading device for medium speed wire electrical discharge machining as claimed in claim 1, wherein: A sensor (15) is installed in front of the left end of the fourth guide pipe (14).

6. An automatic wire threading device for medium speed wire electrical discharge machining as defined in claim 1, wherein: ​

Images