Automatic wire threading method and device for wire cutting

Abstract

The invention provides an automatic wire threading method and device for linear cutting. A high-elasticity steel wire which is mounted on a wire winding drum, wound on the wire winding drum and provided with one end in a pipe shape is directly wound around an upper guide wheel from the wire winding drum along a guide pipeline, penetrates through a workpiece and is in concentric contact with a guide nozzle on a lower wire frame; after the end part of the molybdenum wire is fed into the central hole of the pipe-shaped end of the steel wire from the lower part of the guide nozzle for a certain length, the steel wire retracts to guide the end part of the molybdenum wire, the molybdenum wire is pushed to a wire winding drum by a wire feeding wheel and is pressed and fixed on the wire winding drum, and the end part of the molybdenum wire is reserved in the central hole of the pipe-shaped end of the steel wire after wire threading is completed; the molybdenum wire and the steel wire are locally bent to absorb the length of the molybdenum wire and the steel wire which are excessive after wire disassembly, when the molybdenum wire is fixed, the steel wire is pressed into a steel wire fixing ring groove formed in a wire winding drum through a pressing wheel and locked through an elastic pressing point, and when the wire is disassembled, the elastic pressing point is unlocked, and the steel wire is guided by the molybdenum wire to enter a guide pipeline. The device comprises a steel wire fixing ring, a nickel-titanium alloy wire, a guiding pipeline, a spinning wheel, a molybdenum wire winding and unwinding wheel, a first driving wheel and a second driving wheel. The device has the advantages of being simple in structure, low in cost, easy to install, stable in performance and the like.

Description

Technical Field

[0001] The present invention relates to the field of automatic wire threading for wire cutting, and provides an automatic wire threading method and device for wire cutting. Background Art

[0002] When processing workpieces on existing wire cutting machines, it is necessary to pass the molybdenum wire through the wire threading hole of the workpiece, which requires a large amount of manpower. In recent years, several automatic wire threading methods and devices have been disclosed. The automatic wire threading methods with publication numbers CN116786926 A and CN119634858 A use a lead wire tube to guide the molybdenum wire above the workpiece, then use a wire pulling hook to pull it to the wire coiling cylinder, and then use a spring piece to fix the end of the molybdenum wire to complete the wire threading action. A wire pressing device is used to press the end of the molybdenum wire to pull out the molybdenum wire from the spring piece to complete the wire removing action. The above methods and devices need to complete various complex actions to achieve wire threading and wire removing during wire threading, with complex structures, high costs, great installation difficulties, and the wire threading success rate being affected by the complex structures. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides an automatic wire threading method and device, which are characterized in that: a highly elastic steel wire with one end in a tube shape, which is installed on and wound around the wire coiling cylinder, directly passes from the wire coiling cylinder along a guiding pipeline, bypasses an upper guide wheel, passes through the workpiece, and is concentrically contacted with a guide nozzle on a lower wire frame. The end of the molybdenum wire is fed into the central hole of the tube-shaped end of the steel wire from below the guide nozzle for a certain length, and then the steel wire retreats to guide the end of the molybdenum wire, and the molybdenum wire is pushed by a wire feeding wheel to the wire coiling cylinder and pressed and fixed on the wire coiling cylinder. After wire threading is completed, the end of the molybdenum wire remains in the central hole of the tube-shaped end of the steel wire; the extra length of the molybdenum wire and the steel wire after wire removal is absorbed by locally bending the molybdenum wire and the steel wire; when fixing the molybdenum wire, a pressing wheel is used to press the steel wire into a groove of a steel wire fixing ring installed on the wire coiling cylinder and locked by an elastic pressing point, and when removing the wire, the elastic pressing point is unlocked, and the steel wire is guided into the guiding pipeline by the molybdenum wire; the device includes a steel wire fixing ring, a nickel-titanium alloy wire, a guiding pipeline, a spinning wheel, a molybdenum wire winding and unwinding wheel, a first driving wheel, and a second driving wheel. The steel wire fixing ring is installed on the wire coiling cylinder, and has a groove on its outer circle, and an elastic pressing point is arranged in the groove; the nickel-titanium alloy wire has a diameter of 0.4 - 1.2 mm and a length of 0.8 - 3.0 m, one end of which is fixed in the groove, and the other end is in a tube shape with an inner hole diameter of 0.15 - 0.4 mm and a hole depth of 0.1 - 0.5 m; the guiding pipeline is installed on an upper wire frame. Brief Description of the Drawings

[0004] Att Figure 1 It is a schematic diagram of the device of the present invention; Att Figure 2 It is a schematic diagram of the wire coiling cylinder; Att Figure 3 It is a schematic diagram of the steel wire fixing ring; Att Figure 4 It is a schematic diagram of the molybdenum wire winding and unwinding wheel; Attached Figure 5 is a schematic diagram of the molybdenum wire feeding wheel; The present invention will be further described below in conjunction with the accompanying drawings: Attached Figure 1 is a schematic diagram of the device of the present invention: 01 is a molybdenum wire winding and unwinding wheel; 02 is a wire winding cylinder seat; 03 is a spinning wheel; 04 is a wire removing cylinder; 05 is a wire discharging wheel; 06 is a first driving wheel; 07 is a first driving wheel motor; 08 is a steel wire guiding pipe; 09 is an upper wire rack; 10 is an upper guide wheel; 11 is a second driving wheel; 12 is a second driving wheel motor; 13 is a guide wheel mounting plate; 14 is a guiding and rotational speed detecting wheel; 15 is a steel wire bent upward; 16 is a workpiece; 17 is a lower guide wheel; 18 is a lower wire rack.

[0005] Attached Figure 2 is a schematic diagram of the wire winding cylinder: 21 is a molybdenum wire; 22 is a wire winding cylinder; 23 is a molybdenum wire anti-slip notch; 24 is a steel wire fixing ring; 25 is a wire winding cylinder seat; 26 is a highly elastic steel wire; 27 is an elastic pressing needle; 28 is a wire removing cylinder top block; 29 is a wire removing cylinder; 30 is a steel wire fixing ring groove; 31 is a spinning wheel; 32 is a spinning wheel bracket; 33 is a spinning wheel cylinder.

[0006] Attached Figure 3 is a schematic diagram of the steel wire fixing ring: 41 is a wire winding cylinder; 42 is a molybdenum wire; 43 is a spinning wheel; 44 is a spinning wheel shaft; 45 is a tubular end of the highly elastic steel wire; 46 is a steel wire fixing ring groove; 47 is a molybdenum wire; 48 is a wire removing spring fulcrum; 49 is a wire removing ejector rod; 50 is an elastic pressing needle; 51 is a wire removing cylinder top block; 52 is a wire removing cylinder; 53 is a wire removing spring; 54 is a wire removing spring fixing screw; 55 is a molybdenum wire anti-slip notch; 56 is a highly elastic steel wire wound in the steel wire fixing ring groove.

[0007] Attached Figure 4 is a schematic diagram of the molybdenum wire winding and unwinding wheel: 61 is a transition wheel; 62 is a lower wire rack; 63 is a molybdenum wire; 64 is a molybdenum wire winding and unwinding wheel; 65 is a molybdenum wire winding and unwinding wheel arm; 66 is a wire tightening induction switch; 67 is a wire threading induction switch; 68 is a wire breakage protection switch; 69 is a spring; 70 is a spring bracket; 71 is a molybdenum wire winding and unwinding wheel arm rotation shaft; 72 is a molybdenum wire winding and unwinding wheel slider; 73 is a push rod; 74 is a push rod motor; 75 is a guide rail.

[0008] Attached Figure 5 is a schematic diagram of the molybdenum wire feeding wheel: 81 is a lower wire rack; 82 is a molybdenum wire; 83 is a lower guide wheel; 84 is a nozzle mounting plate; 85 is a nozzle; 86 is a guide block; 87 is a feeding wheel; 88 is a feeding wheel motor; 89 is a feeding cylinder; 90 is a feeding wheel bracket; 91 is a feeding wheel rotation shaft.

[0009] The present invention will be further described in detail below in conjunction with the accompanying drawings: As shown in the attached drawings, the wire fixing ring 24 is installed on the wire winding drum 22. There is a wire fixing ring groove 46 on the wire fixing ring. The width of the groove is slightly larger than the diameter of the high-elasticity wire 56. One end of the high-elasticity wire 56 wound in the wire fixing ring groove is fixed at the bottom of the groove, with a length of about 1 - 3 meters and a diameter of 0.4 - 1.2 mm. The other end is tubular, with an inner hole of about 0.15 - 0.4 mm and an inner hole depth of about 0.1 - 0.5 meters.

[0010] As shown in the attached drawings, the wire removing elastic piece 53 is an elastic steel sheet. One end is fixed on the wire fixing ring 24 by the wire removing elastic piece fixing screw 54. One end of the elastic pressing needle 50 is installed on the wire removing elastic piece 53, and the other end is spherical and passes through the through hole on the wire fixing ring 24 to expose the spherical head part in the wire fixing ring groove 46 with a length of about half of the width of the wire fixing ring groove 46. One end of the wire removing ejector rod 49 is installed on the wire removing elastic piece 53, and the other end passes through the through hole on the wire fixing ring 24 to expose about 3 mm on the side of the wire fixing ring 24. The wire removing cylinder 29 is installed on the wire winding drum seat 25. When the wire removing cylinder 52 acts, the wire removing cylinder top block 51 presses the wire removing ejector rod 49 on the wire removing elastic piece 53. Under the action of the wire removing elastic piece fulcrum 48, the wire removing elastic piece 53 pulls the elastic pressing needle 50 outwards from the wire fixing ring groove 46 due to the pressure on the wire removing ejector rod 49 until the spherical end of the elastic pressing needle 50 does not expose from the wire fixing ring groove 46; Multiple wire removing elastic pieces 53 are evenly distributed on the wire fixing ring 24.

[0011] As shown in the attached drawings, the spinning wheel cylinder 33 is installed on the wire winding drum seat 25. The spinning wheel 31 is installed on the spinning wheel bracket 32 through a bearing, and the spinning wheel bracket is installed on the shaft of the spinning wheel cylinder 33. During wire threading, the spinning wheel cylinder 33 acts to press the high-elasticity wire 26 with the spinning wheel 31. The wire winding drum rotates to pull back the high-elasticity wire 26 and the molybdenum wire at the end inside the high-elasticity wire 26 and wind them in the wire fixing ring groove 46. The spinning wheel 31 squeezes the elastic pressing needle 27 through the high-elasticity wire 26, so that the high-elasticity wire 26 enters the inside of the elastic pressing needle 27. After the elastic pressing needle 27 pops out, it locks the high-elasticity wire 26 in the wire fixing ring groove 46. After the high-elasticity wire 26 is completely wound in the wire fixing ring groove 46, the molybdenum wire continues to cover and wind around the high-elasticity wire 26 for a certain number of turns to ensure that the high-elasticity wire 26 is not thrown out when the wire winding drum rotates at high speed. When the molybdenum wire fills up to the molybdenum wire anti-slip notch 23, it automatically changes from winding around the molybdenum wire anti-slip notch to winding around the wire winding drum. The molybdenum wire anti-slip notch 23 ensures that the molybdenum wire does not slip out of the wire fixing ring groove 46. After wire threading is completed, the spinning wheel 31 is loosened by the action of the spinning wheel cylinder 33; During wire removal, the wire removing cylinder 29 acts, and the elastic pressing needle 27 unlocks the high-elasticity wire 26. The high-elasticity wire 26 is guided by the molybdenum wire into the wire guiding pipe 08. The wire guiding pipe 08 is installed on the upper wire rack 09.

[0012] As shown in the attached drawings, the wire arranging wheel 05 is installed on the upper wire rack 09, the first driving wheel 06 is installed on the shaft of the first driving wheel motor 07, the first driving wheel motor 07 is installed on the upper wire rack 09, and the wire arranging wheel 05 is in contact with the first driving wheel 06 through the high-elasticity steel wire 26, which can drive the high-elasticity steel wire 26. After wire threading is completed, the wire arranging wheel 05 and the first driving wheel 06 are not in contact with each other; the upper guide wheel 10 is installed on the upper wire rack 09, the second driving wheel 11 is installed on the shaft of the second driving wheel motor 12, the upper guide wheel 10 is in contact with the second driving wheel 11 through the high-elasticity steel wire 26, which can drive the high-elasticity steel wire 26. After wire threading is completed, the upper guide wheel 10 and the second driving wheel 11 are not in contact with each other; two guiding and rotational speed detecting wheels 14 are installed on the guide wheel mounting plate 13, the guide wheel mounting plate 13 is installed on the upper wire rack 09, the two guiding and rotational speed detecting wheels 14 are in contact through the high-elasticity steel wire 26. When the high-elasticity steel wire 26 moves up and down between the two guiding and rotational speed detecting wheels 14, it drives the two guiding and rotational speed detecting wheels 14 to rotate. When the downward movement of the high-elasticity steel wire 26 driven by the second driving wheel 11 is blocked, the second driving wheel 11 rotates while the guiding and rotational speed detecting wheels 14 do not rotate. Then the second driving wheel 11 reverses by a certain angle and then rotates forward. After the high-elasticity steel wire 26 retreats and then moves downward, it ensures that the high-elasticity steel wire 26 passes through the wire threading hole of the workpiece.

[0013] As shown in the attached drawings, the lower guide wheel 83 is installed on the lower wire rack 81, the wire feeding wheel 87 is installed on the wire feeding wheel bracket 90, the wire feeding wheel bracket 90 is installed on the lower wire rack 81 through the wire feeding wheel rotating shaft 91, and the wire feeding wheel 87 is driven by the wire feeding wheel motor 88 installed on the wire feeding wheel bracket 90. During wire threading, the wire feeding cylinder 89 acts to press the wire feeding wheel 87 and the lower guide wheel 83 against the molybdenum wire and push it upward. After wire threading is completed, the wire feeding wheel 87 and the lower guide wheel 83 are disengaged; the nozzle 85 and the guiding block 86 are installed in the nozzle mounting plate 84, the nozzle mounting plate 84 is installed on the lower wire rack 81, the inner hole of the nozzle 85 is funnel-shaped. During wire threading, the end of the high-elasticity steel wire 26 automatically aligns with the central hole of the nozzle, and the molybdenum wire is pushed by the wire feeding wheel 87 and the lower guide wheel 83 into the end hole of the high-elasticity steel wire 26.

[0014] As shown in the attached drawings, the transition wheel 61 is installed on the wire outlet frame 62, the molybdenum wire winding and unwinding wheel 64 is installed on the molybdenum wire winding and unwinding wheel arm 65, the molybdenum wire winding and unwinding wheel arm 65 is installed on the molybdenum wire winding and unwinding wheel slider 72 through the molybdenum wire winding and unwinding wheel arm rotating shaft 71. Springs are installed on both sides of the molybdenum wire winding and unwinding wheel arm 65 on the spring brackets 70, and the spring brackets 70 are installed on the molybdenum wire winding and unwinding wheel slider 72. When threading the wire, the molybdenum wire 63 tightens the molybdenum wire winding and unwinding wheel arm 65. When the wire threading induction switch 67 senses the molybdenum wire winding and unwinding wheel arm 65, the push rod motor 74 pushes the molybdenum wire winding and unwinding wheel slider 72 to move leftward through the push rod 73 to ensure continuous release of the molybdenum wire. During cutting, the wire tightening induction switch 66 senses the molybdenum wire winding and unwinding wheel arm 65 to ensure that the molybdenum wire has a greater tension. The wire break protection switch 68 senses the molybdenum wire winding and unwinding wheel arm 65 when the molybdenum wire breaks to play a role in stopping the machine for protection. The wire tightening induction switch 66, the wire threading induction switch 67, and the wire break protection switch 68 are installed on the molybdenum wire winding and unwinding wheel slider 72. The molybdenum wire winding and unwinding wheel slider 72 is installed on the guide rail 75, and the guide rail 75 is installed on the wire outlet frame 18.

[0015] As shown in the attached drawings, the steel wire guiding pipe 08 is installed on the wire inlet frame 09, and is used to guide the high-elastic steel wire 26 from the wire reel to the nozzle 85. There is a gap above the middle section of the steel wire guiding pipe 08 with a width greater than the diameter of the high-elastic steel wire 26. When removing the wire, when the front end of the high-elastic steel wire 26 reaches the guiding and rotation speed detection wheel 14, the second driving wheel 11 stops rotating while the first driving wheel 06 continues to rotate, and then the high-elastic steel wire 26 bends into the shape shown in 15 from the gap above the middle section of the steel wire guiding pipe 08 to absorb the extra wire length after wire removal. Specific embodiments

[0016] The following is an introduction to a single wire threading operation: The first step: The tubular end of the high-elastic steel wire 26 is placed at the guiding and rotation speed detection wheel 14. The high-elastic steel wire 26 in the middle section of the guiding pipe 08 is bent into the shape shown in 15. The molybdenum wire winding and unwinding wheel slider 72 is in a position close to the push rod motor 74, and the end of the molybdenum wire is at the guiding block 86. The second step: When wire threading starts, the second driving wheel 11 drives the high-elastic steel wire 26 to pass downward through the workpiece to the nozzle 85. Through the funnel-shaped inner hole of the nozzle 85, the end of the high-elastic steel wire 26 is straightened so that its inner hole is concentric with the nozzle hole, and the bent wire shown in 15 is straightened. The third step: The wire feeding cylinder 89 acts to make the wire feeding wheel 87 press the molybdenum wire and push the molybdenum wire upward into the end hole of the high-elastic steel wire 26 for a certain length. During this period, when the wire threading induction switch 67 senses that the molybdenum wire is tightened, the push rod motor 74 controls the molybdenum wire winding and unwinding wheel slider 72 to move leftward to synchronously release the molybdenum wire. Step 4: At this time, the highly elastic wire 26 and the molybdenum wire form a closed loop. The wire winding cylinder rotates to pull back the highly elastic wire 26, and the wire feeding wheel 87 synchronously pushes the molybdenum wire. During this period, the spinning wheel cylinder 33 operates, and the spinning wheel 31 presses the highly elastic wire 26 into the groove 46 of the wire fixing ring and locks it with the elastic pressing needle 27. After the highly elastic wire 26 is completely wound in the groove 46 of the wire fixing ring, the wire winding cylinder continues to rotate and the molybdenum wire continues to cover and wind around the highly elastic wire 26 for a certain number of turns. When the molybdenum wire fills up to the anti-slip notch 23 of the molybdenum wire, it automatically changes from winding around the anti-slip notch of the molybdenum wire to winding onto the wire winding cylinder. At this time, the machine tool can perform normal cutting; Step 5: After cutting is completed, wire removal is carried out. The wire winding cylinder rotates to release the molybdenum wire covering and winding around the highly elastic wire 26. The wire removal cylinder 29 operates, and the elastic pressing needle 27 unlocks the highly elastic wire 26. The highly elastic wire 26 is guided by the molybdenum wire into the wire guiding pipe 08. The first driving wheel 06 and the second driving wheel 11 synchronously push the highly elastic wire 26 forward. When the front end of the highly elastic wire 26 passes through to the guiding and rotational speed detection wheel 14, the second driving wheel 11 stops rotating while the first driving wheel 06 continues to rotate, then the highly elastic wire 26 bends into the shape shown in 15 from the gap above the middle section of the wire guiding pipe 08. The push rod motor 74 controls the molybdenum wire take-up and pay-off wheel slider 72 to move to the right to pull down the end of the molybdenum wire to the guiding block 86; Step 6: At this time, the molybdenum wire is separated from the highly elastic wire 26, and the machine tool jumps the workpiece to the next wire threading hole; Step 7: Repeat Step 1 to Step 6.

[0017] The above actions are controlled by the control system.

Claims

1. A method for automatic wire threading in wire cutting, characterized in that: The method comprises adopting a highly elastic steel wire with one end in a tubular shape which is installed on and wound on a wire drum, and directly passes from the wire drum along a guide pipe, bypasses an upper guide wheel, passes through a workpiece, and makes concentric contact with a guide nozzle on a lower wire rack; the end of the molybdenum wire is fed from below the guide nozzle into a central hole of the tubular end of the steel wire for a certain length, and then the steel wire is retracted to guide the end of the molybdenum wire, and the wire feeding wheel pushes the molybdenum wire to the wire drum and presses and fixes the molybdenum wire on the wire drum; after the wire threading is completed, the end of the molybdenum wire remains in the central hole of the tubular end of the steel wire; and the excess length of the molybdenum wire and the steel wire after the wire removal is absorbed by locally bending the molybdenum wire and the steel wire.

2. A method for automatic wire threading of wire cutting according to claim 1, characterized in that: The method comprises using a pressure wheel to press the steel wire into a groove of a steel wire fixing ring installed on a wire reel when fixing the molybdenum wire and locking it through an elastic pressure point; unlocking the elastic pressure point when removing the wire and guiding the steel wire into the guide pipe by the molybdenum wire.

3. An automatic wire threading device for wire cutting as claimed in claim 1, characterized in that: It includes a steel wire fixing ring, a nickel-titanium alloy wire and a guide pipe. The steel wire fixing ring is installed on the wire reel, and has a groove on the outer circle, and an elastic pressure point in the groove. The nickel-titanium alloy wire has a diameter of 0.4-1.2 mm and a length of 0.8-3.0 m, one end of which is fixed in the groove, and the other end is a tube, with an inner hole diameter of 0.15-0.4 mm and a hole depth of 0.1-0.5 m. The guide pipe is installed on the upper wire rack.

4. An automatic wire threading device for wire cutting as claimed in claim 3, characterized in that: It includes a spinning wheel, a molybdenum wire taking-up and releasing wheel, a first driving wheel and a second driving wheel. The spinning wheel is installed on a spinning wheel bracket through a bearing, the spinning wheel bracket is installed on the spinning wheel cylinder shaft, and the spinning wheel cylinder is installed on a wire reel seat; the molybdenum wire taking-up and releasing wheel is installed on a molybdenum wire taking-up and releasing wheel arm, the molybdenum wire taking-up and releasing wheel arm is installed on a molybdenum wire taking-up and releasing wheel slider through a molybdenum wire taking-up and releasing wheel arm rotating axis, the molybdenum wire taking-up and releasing wheel slider is installed on a guide rail, and the guide rail is installed on a lower wire rack; the first driving wheel is in contact with the wire discharging wheel through a high-elastic steel wire; the second driving wheel is in contact with the upper guide wheel through a high-elastic steel wire.

5. A wire cutting machine tool as claimed in claim 1 or 2.

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