Linear cutting machine tool capable of adaptively adjusting pressing line

Abstract

The invention provides a self-adaptive wire pressing adjusting wire cutting machine tool, and relates to the technical field of wire cutting, the self-adaptive wire pressing adjusting wire cutting machine tool comprises a machine body, a support is arranged in the middle of the machine body, a swing arm assembly is rotatably arranged on one side of the support, two auxiliary pulleys are arranged on the upper side of the support, and a roller seat is arranged on one side of the machine body; the tension sensor and the motor drive are matched with the PLC to form a closed-loop control loop, and therefore the high response characteristic is achieved. When tension high-frequency fluctuation is caused by small diameter change caused by instantaneous swing or abrasion of the silk yarn, the system can detect the small deviation in real time and immediately drive the adjusting mechanism to act. The wire pressing pressure is changed by rapidly adjusting the position of the balance weight of the swing arm, so that real-time hedging and compensation are carried out on fluctuation, the tension value is firmly stabilized in a set interval, and interference transmitted into a cutting area is effectively restrained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire cutting, in particular to a wire cutting machine tool capable of self-adaptive adjustment of wire pressure. BACKGROUND

[0002] The wire cutting machine tool can cut part of materials through the instantaneous high temperature of electric spark. A kind of automatic wire connecting mechanism for wire cutting machine tool is disclosed in patent announcement No. CN214185626U, which comprises a plurality of wire reels, a pressure connecting mechanism, a first sensor and a second sensor. The plurality of wire reels are rotatably arranged on the machine tool body; the pressure connecting mechanism is arranged on the machine tool body, and the metal wire can pass through the pressure connecting mechanism. The pressure connecting mechanism is used to connect the wire tail of the metal wire in use and the wire head of the unused metal wire.

[0003] During the cutting process, the machining precision and surface quality are largely dependent on the motion stability of the electrode wire during the cutting process. The tension of the electrode wire is one of the key parameters affecting its motion state: too high tension can easily lead to wire fatigue fracture, increasing the risk of wire breakage and production cost; too low tension can cause the wire to vibrate in the machining area, directly affecting the straightness, surface roughness and dimensional accuracy of the cutting surface.

[0004] At present, most wire cutting machine tools use mechanical tensioning mechanisms with fixed counterweights or preset spring pressure. Although this structure is simple and reliable, the tension value is difficult to dynamically adjust during the machining process once it is set; During actual cutting and long-time continuous machining, the electrode wire will be uniformly worn due to continuous discharge and friction, resulting in a gradual decrease in its diameter. This slight change will have a chain effect: the thickness of each coil decreases when the worn wire is wound on the wire collecting drum, causing the overall outer diameter of the winding layer to increase at a lower speed than expected, which results in a structure with fixed counterweights or preset spring pressure that cannot meet the required tension.

[0005] Moreover, the conveying path of the wire from the drum seat to the wire guide cylinder has a certain distance, and although there are guide wheels and horizontal movement of the drum seat to stabilize the wire conveying, small amplitude high-frequency lateral oscillation still occurs during high-speed operation; If the above factors are not addressed, the tension of the wire will fluctuate, and if the fluctuation is not compensated in a timely and adaptive manner, although the amplitude is not large, it will be directly transmitted to the cutting area, causing the wire to vibrate slightly when the tension is too low, affecting the cutting effect, and causing the wire to fatigue fracture at weak points when the tension is too large. SUMMARY

[0006] To overcome the shortcomings of the prior art, the present application provides a wire cutting machine tool capable of self-adaptive adjustment of wire pressure, solving the problem of decreased cutting effect caused by small amplitude fluctuation and wire wear during wire conveying in existing wire cutting.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An adaptive adjustable wire cutting machine includes a machine body, a support is provided in the middle of the machine body, a swing arm assembly is rotatably provided on one side of the support, two auxiliary pulleys are provided on the upper side of the support, and a roller seat is provided on one side of the machine body; A pressure roller is slidably disposed inside the swing arm assembly. The pressure roller moves along the inside of the swing arm assembly to adjust its position on the outside of the swing arm assembly. The swing arm assembly swings to adjust the distance between the pressure roller and the auxiliary roller. The wire inside the roller seat passes through the guide tube, auxiliary pulley, and pressing pulley. The pressing pulley adjusts the tension on the wire during its movement.

[0008] Preferably, a limiting groove is provided in the middle of the bracket, a limiting slide block is slidably installed inside the limiting groove, and a tension sensor is fixedly installed inside the limiting slide block.

[0009] Preferably, the tension sensor detection end is equipped with a roller, the roller body is fixedly equipped with a limit sleeve, and a pressure pulley is rotatably installed at one end of the roller.

[0010] Preferably, the swing arm assembly includes a swing arm body, one side of which is rotatably mounted on the surface of the bracket via a pivot, and the swing arm body has an internal movable groove.

[0011] Preferably, a limiting groove is provided on one side of the movable groove, and the limiting groove is in a limiting fit with a limiting sleeve, through which the idler roller passes.

[0012] Preferably, the inner wall of the movable groove is provided with a guide rail, an adjusting slide is slidably installed inside the guide rail, a mounting slot is provided on the outer side of the adjusting slide, and a counterweight is installed inside the mounting slot.

[0013] Preferably, a drive screw is rotatably mounted on one side inside the movable groove. The drive screw passes through the adjusting slide and is threadedly engaged with the adjusting slide. An adjusting rod is fixedly connected to one end of the drive screw.

[0014] Preferably, a protrusion is provided on the outer side of the swing arm body, the protrusion is coaxial with the rotating shaft, and a transmission cavity is formed together with the interior of the swing arm body.

[0015] Preferably, the drive screw body is provided with a mating bevel gear, and a bevel gear shaft is rotatably mounted inside the protrusion, the bevel gear shaft meshing with the mating bevel gear.

[0016] Preferably, a boss is fixedly installed on one side of the bracket surface, and a motor is fixedly installed on the upper side of the boss. The output end of the motor is fixedly connected to the bevel gear shaft through a coupling.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The closed-loop control circuit, consisting of a tension sensor, motor drive, and PLC controller, provides high responsiveness. When minute changes in wire diameter due to momentary oscillation or wear cause high-frequency tension fluctuations, the system can detect these minute deviations in real time and immediately drive the adjustment mechanism. By rapidly adjusting the position of the swing arm counterweight to change the wire pressing pressure, the system can counteract and compensate for the fluctuations in real time, firmly stabilizing the tension value within the set range and effectively suppressing interference entering the cutting area.

[0018] 2. This application enables adaptive tension adjustment, allowing continuous monitoring and compensation for the gradual decrease in tension caused by uniform wire wear. Throughout the entire wire's lifespan, the optimal cutting tension is automatically maintained without manual intervention. This ensures highly consistent cutting results throughout the entire processing process, from the initial wire installation to replacement, resulting in uniform surface quality and stable dimensional accuracy, suitable for long-term unattended operation or batch precision machining. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a side view of the structure of the present invention; Figure 5 This is a three-dimensional structural diagram of the support. Figure 6 This is a front view schematic diagram of the support structure; Figure 7 This is a 3D structural schematic diagram of the swing arm assembly; Figure 8 This is a front view structural diagram of the swing arm assembly; Figure 9 yes Figure 8 Schematic diagram of the cross-sectional structure at point AA; Figure 10 yes Figure 9 Enlarged structural diagram at point a; Figure 11 This is a top view of the swing arm assembly. Figure 12 yes Figure 11Schematic diagram of the cross-sectional structure at point BB; Figure 13 yes Figure 11 Schematic diagram of the cross-sectional structure at the CC section; Figure 14 yes Figure 11 Schematic diagram of the cross-sectional structure at point DD; Figure 15 yes Figure 11 Schematic diagram of the cross-sectional structure at the EE section.

[0020] In the diagram: 1. Machine body; 2. Support frame; 3. Roller seat; 4. Guide tube; 5. Swing arm assembly; 501. Swing arm body; 502. Rotating shaft; 503. Movable groove; 5031. Guide rail; 5032. Limiting groove; 504. Protrusion; 5041. Transmission cavity; 5042. Adjusting rod; 505. Bevel gear shaft; 506. Drive screw; 5061. Matching bevel gear; 507. Adjusting slide; 5071. Mounting slot; 5072. Counterweight; 6. Pressing pulley; 601. Limiting sleeve; 7. Auxiliary pulley; 8. Boss; 9. Motor; 10. Limiting groove; 11. Limiting slide; 12. Tension sensor; 13. Idler roller. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 7 As shown, an adaptive adjustable wire cutting machine includes a body 1, a support 2 is provided in the middle of the body 1, a swing arm assembly 5 is rotatably provided on one side of the support 2, two auxiliary pulleys 7 are provided on the upper side of the support 2, and a roller seat 3 is provided on one side of the body 1. A pressure roller 6 is slidably provided inside the swing arm assembly 5. The pressure roller 6 moves along the inside of the swing arm assembly 5 to adjust its position on the outside of the swing arm assembly 5. The swing arm assembly 5 swings to adjust the distance between the pressure roller 6 and the auxiliary roller 7. The silk thread inside the roller seat 3 passes through the guide tube 4, then through the auxiliary pulley 7 and the pressing pulley 6. The pressing pulley 6 adjusts the tension on the silk thread during its movement.

[0023] The distance between the pressure pulley 6 and the auxiliary pulley 7 can be adjusted by the swing arm assembly 5, thereby changing the tension of the passing wire. This allows the tension of the wire to be regulated, avoiding the problem of decreased wire cutting accuracy caused by fluctuations in the wire during its journey from the roller seat 3 to the guide tube 4 and unstable subsequent wire feeding.

[0024] In this embodiment, a limiting groove 10 is provided in the middle of the bracket 2, and a limiting slide block 11 is slidably installed inside the limiting groove 10. A tension sensor 12 is fixedly installed inside the limiting slide block 11.

[0025] The limiting slide groove 10 and the limiting slide block 11 limit each other, so that the pressing pulley 6 can be vertically limited when adjusting the height. Then, through the cooperation between the limiting slide sleeve 601 and the limiting groove 5032, the pressing pulley 6 can move vertically up and down stably.

[0026] Among them, the tension sensor 12 is equipped with a roller 13 at the detection end, the roller body of the roller 13 is fixedly equipped with a limit sleeve 601, and a pressure pulley 6 is rotatably installed at one end of the roller 13.

[0027] The tension sensor 12 has a roller 13 installed at its detection end. The roller 13 extends out and is equipped with a pressing pulley 6, so that the pressing pulley 6 can monitor the tension of the current thread in real time when it contacts the thread. When the tension is greater than or less than the set threshold, the motor 9 will be started to rotate in the opposite direction to achieve adaptive adjustment of the current pressing intensity.

[0028] like Figure 1 , Figures 7 to 15 As shown, the swing arm assembly 5 includes a swing arm body 501. One side of the swing arm body 501 is rotatably mounted on the surface of the bracket 2 via a pivot 502. An active groove 503 is provided inside the swing arm body 501.

[0029] Among them, a limiting groove 5032 is provided on one side of the movable groove 503. The limiting groove 5032 is in a limiting cooperation with the limiting sleeve 601, and the idler roller 13 passes through the movable groove 503.

[0030] The rotating shaft 502 is located on one side of the swing arm body 501, and the two ends of the swing arm body 501 are of different lengths. The longer end of the swing arm body 501 can cooperate with the counterweight 5072 to press the wire pressing pulley 6, so as to achieve different strengths of wire pressing and meet the needs of wire conveying.

[0031] The limiting sleeve 601 can slide stably inside the limiting groove 5032, avoiding interference with the tension detection of the roller 13 when the swing arm assembly 5 swings. The roller 13 can extend the detection range of the tension sensor 12, so that the tension of the thread receiving pulley 6 is transmitted to the roller 13 and the tension sensor 12 can detect it.

[0032] In this embodiment, a guide rail 5031 is provided on the inner wall of the movable groove 503, an adjusting slide block 507 is slidably installed inside the guide rail 5031, a mounting slot 5071 is provided on the outer side of the adjusting slide block 507, and a counterweight block 5072 is installed inside the mounting slot 5071.

[0033] The counterweight 5072 can be installed inside the mounting slot 5071, so that the counterweight 5072 of appropriate weight can be installed in the mounting slot 5071 according to the specifications of the wire, and then the required gravity range can be adaptively adjusted in conjunction with the movement of the adjusting slide 507.

[0034] It should be noted that a drive screw 506 is rotatably installed on one side inside the movable groove 503. The shaft of the drive screw 506 passes through the adjusting slide 507, and the shaft of the drive screw 506 is threadedly engaged with the adjusting slide 507. An adjusting rotating rod 5042 is fixedly connected to one end of the drive screw 506.

[0035] When the drive screw 506 rotates, the guide rail 5031 and the adjusting slide 507 are in a limiting sliding fit, and the drive screw 506 body is in a threaded fit with the adjusting slide 507, so that the adjusting slide 507 will move horizontally inside the movable groove 503. By changing the distance between the adjusting slide 507 and the rotating shaft 502, the counterweight 5072 can change the current pressing angle of the swing arm body 501. For example, when the tension of the thread is low, the counterweight 5072 moves away from the rotating shaft 502, causing the pressing pulley 6 to descend and support the thread in time, preventing the thread from becoming too loose and causing it to fall off or vibrate. Conversely, when the tension of the thread is high, the counterweight 5072 moves closer to the rotating shaft 502, causing the pressing pulley 6 to rise, reducing the tension of the pressing pulley 6 on the thread, and preventing the thread from becoming too tight and causing it to break. With the real-time monitoring of the tension sensor 12, the current tension can be quickly detected and corresponding adaptive adjustment operations can be performed, effectively avoiding the wire from breaking due to excessive tension during the feeding process, which would affect the cutting efficiency, or falling off due to insufficient tension, or vibration affecting the cutting accuracy.

[0036] In the specific configuration, a protrusion 504 is provided on the outer side of the swing arm body 501. The protrusion 504 is coaxial with the rotating shaft 502, and a transmission cavity 5041 is jointly formed inside the protrusion 504 and the swing arm body 501. The transmission cavity 5041 provides space for the bevel gear shaft 505 to mesh with the mating bevel gear 5061. The adjusting rod 5042 is fixedly connected to the drive screw 506, so that before cutting, according to the current wire tension requirement, rotating the adjusting rod 5042 drives the drive screw 506 to rotate, thereby pre-adjusting the tension and ensuring that the wire tension is within the required threshold at the beginning.

[0037] In this application, the drive screw 506 is provided with a mating bevel gear 5061, and a bevel gear shaft 505 is rotatably mounted inside the protrusion 504, and the bevel gear shaft 505 meshes with the mating bevel gear 5061.

[0038] Among them, a boss 8 is fixedly installed on one side of the surface of the bracket 2, and a motor 9 is fixedly installed on the upper side of the boss 8. The output end of the motor 9 is fixedly connected to the bevel gear shaft 505 through a coupling.

[0039] By starting the motor 9 to rotate, the bevel gear shaft 505 can be driven to rotate continuously inside the protrusion 504. During the rotation of the bevel gear shaft 505, it meshes with the cooperating bevel gear 5061, thereby driving the drive screw 506 to rotate accordingly. The motor 9 can receive start and stop information from the tension sensor 12 using a PLC controller to realize the corresponding forward and reverse rotation drive of the motor 9. Through the above drive structure, this application can automatically adjust the tension of the wire. The adaptive adjustment with the tension sensor 12 effectively improves the stability and service life of the wire during use, and also improves the accuracy of subsequent online cutting.

[0040] The working principle of this adaptive wire cutting machine with adjustable pressure: In use, the wire is first passed through the guide tube 4 from the roller seat 3 and then through two auxiliary pulleys 7 and one pressing pulley 6. Then, according to the initial tension requirement of the wire, the adjusting rod 5042 is rotated to drive the drive screw 506 to rotate. The threaded engagement between the drive screw 506 and the adjusting slide 507 is used to adjust the distance between the counterweight 5072 and the rotating shaft 502. Then, under the limit of the limiting slide groove 10 and the limiting slide 11, the pressing pulley 6 moves vertically to the required height to support the wire that is currently passing through. Then the machine tool is started to cut. During the cutting process, the wire will continuously enter the guide tube 4 from the roller seat 3. Because the wire moves and swings during the conveying process, the length of the wire between the pressure pulley 6 and the auxiliary pulley 7 will change to a certain extent, resulting in the current tension not meeting the wire requirements. When changes occur, the tension is transmitted to the tension sensor 12 via the roller 13. The tension sensor 12 then monitors the data. When the data fluctuates significantly, the PLC controller controls the motor 9 to rotate in the required direction, thereby adjusting the distance between the current counterweight 5072 and the rotating shaft 502, so that the pressure of the pressure pulley 6 meets the tension range of the current thread.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A wire EDM machine tool with adaptive adjustment of wire pressure, comprising a machine body (1), characterized in that: A bracket (2) is provided in the middle of the body (1), a swing arm assembly (5) is rotatably provided on one side of the bracket (2), two auxiliary pulleys (7) are provided on the upper side of the bracket (2), and a roller seat (3) is provided on one side of the body (1). The swing arm assembly (5) is slidably provided with a pressing pulley (6). The pressing pulley (6) moves along the inside of the swing arm assembly (5) to adjust its position on the outside of the swing arm assembly (5). The swing arm assembly (5) swings to adjust the distance between the pressing pulley (6) and the auxiliary pulley (7). The inner thread of the roller seat (3) passes through the guide tube (4) and then through the auxiliary pulley (7) and the pressing pulley (6). The pressing pulley (6) adjusts the tension of the thread during its movement.

2. The wire cutting machine tool with adaptive pressure adjustment according to claim 1, characterized in that: The bracket (2) has a limiting groove (10) in the middle, and a limiting slide (11) is slidably installed inside the limiting groove (10). A tension sensor (12) is fixedly installed inside the limiting slide (11).

3. The wire cutting machine tool with adaptive pressure adjustment according to claim 2, characterized in that: The tension sensor (12) is equipped with a roller (13) at its detection end. The roller body of the roller (13) is fixedly equipped with a limiting sleeve (601). One end of the roller (13) is rotatably equipped with a pressure pulley (6).

4. The wire cutting machine tool with adaptive pressure adjustment according to claim 3, characterized in that: The swing arm assembly (5) includes a swing arm body (501), one side of which is rotatably mounted on the surface of the bracket (2) via a pivot (502), and an active groove (503) is provided inside the swing arm body (501).

5. The wire cutting machine tool with adaptive pressure adjustment according to claim 4, characterized in that: A limiting groove (5032) is provided on one side of the movable groove (503). The limiting groove (5032) is in a limiting fit with the limiting sleeve (601). The roller (13) passes through the movable groove (503).

6. The wire cutting machine tool with adaptive pressure adjustment according to claim 4, characterized in that: The inner wall of the movable groove (503) is provided with a guide rail (5031), and an adjusting slide (507) is slidably installed inside the guide rail (5031). A mounting slot (5071) is provided on the outer side of the adjusting slide (507), and a counterweight (5072) is installed inside the mounting slot (5071).

7. The wire cutting machine tool with adaptive pressure adjustment according to claim 6, characterized in that: A drive screw (506) is rotatably installed on one side inside the movable groove (503). The shaft of the drive screw (506) passes through the adjusting slide (507). The shaft of the drive screw (506) is threadedly engaged with the adjusting slide (507). An adjusting rotating rod (5042) is fixedly connected to one end of the drive screw (506).

8. The wire cutting machine tool with adaptive pressure adjustment according to claim 7, characterized in that: The outer side of the swing arm body (501) is provided with a protrusion (504), the protrusion (504) is coaxially arranged with the rotating shaft (502), and the protrusion (504) and the swing arm body (501) are provided with a transmission cavity (5041).

9. A wire EDM machine tool with adaptive pressure adjustment according to claim 8, characterized in that: The drive screw (506) is provided with a bevel gear (5061) on its shaft, and a bevel gear shaft (505) is rotatably mounted inside the protrusion (504), and the bevel gear shaft (505) meshes with the bevel gear (5061).

10. A wire EDM machine tool with adaptive pressure adjustment according to claim 9, characterized in that: A boss (8) is fixedly installed on one side of the surface of the bracket (2), and a motor (9) is fixedly installed on the upper side of the boss (8). The output end of the motor (9) is fixedly connected to the bevel gear shaft (505) through a coupling.

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