A machine for cutting a nickel-titanium alloy wire into a fixed length

Abstract

The present application relates to a kind of nickel-titanium alloy wire fixed-length cutting machine, including straightener, feeding mechanism, double-knife cutting mechanism being installed in base in turn along wire conveying direction, still include pressing mechanism, pneumatic drive mechanism and control unit;Feeding mechanism includes servo motor fixed in base, wire feeding driving wheel coaxially connected with servo motor output end;Pressing mechanism includes pressing device being installed in base and being located above wire feeding driving wheel, pressing rubber wheel being rotatably installed in the lower part of pressing device;Double-knife cutting mechanism includes inlet blade, transition guide slot and outlet blade being arranged in turn downstream of wire feeding driving wheel along wire conveying direction;Pneumatic drive mechanism includes air cylinder, cutting pressing plate, solenoid valve;Control unit is electrically connected with servo motor and solenoid valve respectively.Utilize a kind of nickel-titanium alloy wire fixed-length cutting machine designed by the present application, can solve the problem that small-diameter nickel-titanium alloy wire feeding is easily deformed, fixed-length error is big, cutout is irregular and continuous material receiving stability is insufficient.

Description

Technical Field

[0001] This invention relates to the field of metal wire length processing equipment, specifically to a nickel-titanium alloy wire length cutting machine. Background Technology

[0002] Nickel-titanium alloy wire possesses shape memory effect, superelasticity, corrosion resistance, and biocompatibility, making it suitable as a raw material for medical devices, precision electronic components, and other precision parts. In the manufacturing process of related products, it is typically necessary to process wound nickel-titanium alloy wire into straight segments of specified lengths. This length-fixing process involves steps such as wire feeding, straightening, traction feeding, length control, cutting, and winding. The consistency of the finished wire segments' length, surface condition, and cut quality affect subsequent assembly and forming processes.

[0003] Small-diameter nickel-titanium alloy wires are characterized by high flexibility, low stiffness, and easy springback after cutting. When using rigid clamping for feeding, excessive clamping force can easily cause surface damage or cross-sectional deformation of the wire, while insufficient clamping force can easily lead to slippage. When the finished product length is directly determined by the feeding displacement, errors in the wire feeding wheel, wire slippage, and springback during start-stop operations will accumulate to the finished product length. When using single-blade cutting, there is a lack of stable constraint on one side of the wire cutting position, which can easily lead to lateral deviation, end warping, and irregular cuts. Furthermore, the cut material usually needs to be manually removed, which is not conducive to continuous processing.

[0004] Therefore, existing technologies have shortcomings and need to be improved and developed. Summary of the Invention

[0005] The present invention provides a nickel-titanium alloy wire length cutting machine to solve the problems of easy deformation during feeding, large length error, irregular cut, and insufficient continuous feeding stability of small-diameter nickel-titanium alloy wires in the prior art.

[0006] This invention provides a nickel-titanium alloy wire length-cutting machine, including a base, a straightener, a feeding mechanism, a clamping mechanism, a double-blade cutting mechanism, a pneumatic drive mechanism, and a control unit;

[0007] The straightener, the feeding mechanism, and the double-blade cutting mechanism are sequentially installed on the base along the wire conveying direction;

[0008] The feeding mechanism includes a servo motor fixed to the base and a wire feeding drive wheel coaxially connected to the output end of the servo motor.

[0009] The pressing mechanism includes a pressing device mounted on the base and located above the wire feeding drive wheel, and a pressing rubber wheel rotatably mounted on the lower part of the pressing device. The pressing device applies adjustable elastic pressure to the pressing rubber wheel to form a wire feeding channel between the pressing rubber wheel and the wire feeding drive wheel.

[0010] The double-blade cutting mechanism includes an inlet blade, a transition guide groove, and an outlet blade arranged sequentially downstream of the wire feeding drive wheel along the wire conveying direction. Both the inlet blade and the outlet blade include a stationary blade, a moving blade, and an elastic reset member for resetting the moving blade upwards. The stationary blade is fixed to the base, and the moving blade slides relative to the stationary blade in a vertical direction. The cutting planes of the inlet blade and the outlet blade are parallel to each other and spaced apart along the wire conveying direction, forming a fixed-length material limiting area between the two cutting planes. The transition guide groove is fixed to the base and located between the two cutting planes.

[0011] The pneumatic drive mechanism includes a cylinder fixed to the base and located above the double-blade cutting mechanism, a cutting clamping plate connected to the piston rod of the cylinder and spanning above the two moving blades, and a solenoid valve connected to the air circuit of the cylinder. When the cutting clamping plate moves down, it simultaneously presses against the two moving blades, so that the two moving blades cut synchronously relative to the corresponding stationary blades.

[0012] The control unit is electrically connected to the servo motor and the solenoid valve, respectively.

[0013] Furthermore, the base includes a first mounting plate, a second mounting plate, a third mounting plate, a fourth mounting plate, and a fifth mounting plate;

[0014] The first mounting plate is horizontally positioned, and the second, third, and fourth mounting plates are vertically fixed to the first mounting plate. A first horizontal direction is defined as the horizontal direction parallel to the wire conveying direction, and a second horizontal direction is defined as the direction perpendicular to the first horizontal direction within the horizontal plane. The second and fourth mounting plates are spaced apart along the first horizontal direction, and the third mounting plate is located on the same side of the second and fourth mounting plates along the second horizontal direction. The fifth mounting plate is horizontally mounted on the upper end of the third and fourth mounting plates, which are set at the same height.

[0015] The straightener, the wire feeding drive wheel, and the clamping mechanism are mounted on the same side of the second mounting plate, and the servo motor is mounted on the other side of the second mounting plate; the solenoid valve is mounted on the third mounting plate, the cylinder is mounted on the fifth mounting plate, and the inlet blade, the transition guide groove, and the outlet blade are mounted on the first mounting plate.

[0016] Furthermore, it also includes a filament feeding assembly disposed on the feed side of the straightener;

[0017] The wire feeding assembly includes a wire feeding base, two seated bearings, a wire feeding shaft, a wire spool, two tapered sleeves, and a locking head. The two seated bearings are fixedly spaced on the wire feeding base and rotatably support both ends of the wire feeding shaft. The two tapered sleeves are inserted into the wire feeding shaft from both ends of the inner hole of the wire spool and fitted onto the wire feeding shaft to radially center the wire spool. The locking head is detachably locked to the wire feeding shaft and is located on the side of one of the tapered sleeves facing away from the wire spool, so that the two tapered sleeves clamp the wire spool along the axial direction of the wire feeding shaft.

[0018] Furthermore, the straightener includes three upper straightening rollers located above the filament and four lower straightening rollers located below the filament, with the three upper straightening rollers and the four lower straightening rollers arranged alternately along the filament conveying direction;

[0019] The three upper straightening rollers are rotatably mounted on the same upper roller seat, which moves vertically relative to the fixing frame of the straightener. An adjusting screw is threadedly connected to the fixing frame, and the lower end of the adjusting screw acts on the upper roller seat. When the adjusting screw is rotated, the amount of pressure of the three upper straightening rollers relative to the four lower straightening rollers is changed, so that a straightening channel for wires with a diameter of 0.5 mm to 1.5 mm is formed between the upper and lower straightening rollers.

[0020] Furthermore, the clamping device includes a slide rail, a slider, a rubber wheel mounting base, a compression spring, a clamping cover, a clamping bolt, and a bolt fixing base;

[0021] The slide rail is fixed to the second mounting plate in the vertical direction, the slider is slidably connected to the slide rail, the rubber wheel mounting base is fixed to the slider, and the pressing rubber wheel is rotatably mounted on the rubber wheel mounting base;

[0022] The bolt fixing base is fixed to the second mounting plate and located above the rubber wheel mounting base. The clamping bolt is threadedly connected to the bolt fixing base. The clamping cover is movably disposed between the bolt fixing base and the rubber wheel mounting base along the axial direction of the clamping bolt. The lower end of the clamping bolt abuts against the upper end face of the clamping cover. The upper part of the rubber wheel mounting base is provided with a pin extending in the vertical direction. The lower part of the compression spring is sleeved on the pin. The upper end of the compression spring abuts against the clamping cover, and the lower end of the compression spring abuts against the rubber wheel mounting base.

[0023] Furthermore, the center line of the straightening channel formed by the straightener, the center line of the wire feeding channel, the center line of the wire passage hole of the inlet blade, the center line of the groove of the transition guide groove, and the center line of the wire passage hole of the outlet blade coincide with each other.

[0024] The inlet blade, the transition guide groove, and the outlet blade together constitute the cutting section. The cutting section is installed on the first mounting plate through a first waist-shaped mounting hole extending perpendicular to the wire conveying direction and fasteners passing through the first waist-shaped mounting hole, so that the position of the cutting section is adjusted perpendicular to the wire conveying direction.

[0025] The inlet blade is adjustablely mounted on the first mounting plate via a second waist-shaped mounting hole extending along the wire conveying direction and a fastener passing through the second waist-shaped mounting hole, so as to adjust the distance between the cutting plane of the inlet blade and the cutting plane of the outlet blade.

[0026] Furthermore, the upper ends of the two moving blades are at the same height, and the lower surface of the cutting clamping plate is a plane that simultaneously covers the upper ends of the two moving blades;

[0027] The cylinder is a double-acting cylinder with the piston rod facing downwards. The upper port is connected to the rodless chamber of the cylinder, and the lower port is connected to the rod chamber of the cylinder. When air enters through the lower port, the piston rod drives the cutting and pressing plate to move upwards to the raised position where it is separated from the two moving blades. When air enters through the upper port, the piston rod drives the cutting and pressing plate downwards and simultaneously pushes the two moving blades to complete the shearing.

[0028] Furthermore, the control unit includes a programmable logic controller and has a parameter setting interface, which is used to set the target fixed length of the material, the single feeding length, the feeding speed, and the cutting cycle.

[0029] The servo motor includes a servo encoder and adopts a pulse positioning control mode. The control unit outputs pulse commands and direction commands to the servo motor. The total number of pulses in the pulse command is used to determine the target rotation angle of the servo motor. The servo encoder is used to provide feedback on the actual rotation angle of the servo motor. The servo motor directly drives the wire feeding drive wheel to rotate. The control unit determines the current feeding length based on the actual rotation angle of the servo motor and the effective circumference of the wire feeding drive wheel.

[0030] Furthermore, the control unit is configured to:

[0031] When the wire reaches the single feeding length based on the actual rotation angle fed back by the servo encoder, the servo motor is controlled to stop rotating, and the solenoid valve is controlled to switch direction while the servo motor is stopped, so that air enters the upper interface of the cylinder to drive the cutting and pressing plate to move down.

[0032] The upper port of the cylinder is kept in the air intake state for 2 seconds to form a cut-off holding time; after the cut-off holding time expires, the solenoid valve is controlled to switch direction again, so that the lower port of the cylinder is allowed to enter air and drive the cut-off clamping plate to reset.

[0033] Furthermore, the target fixed-length material length is equal to the distance between the cutting plane of the inlet blade and the cutting plane of the outlet blade, the single feeding length is the sum of the target fixed-length material length and the 1.5mm head waste allowance length, and the target fixed-length material length is greater than 50mm;

[0034] The moving blade of the outlet blade is provided with a blade hole that is adapted to the outer diameter of the wire to be processed and allows only a single wire to pass through. The outlet side of the outlet blade is provided with a receiving box.

[0035] After the cutting and clamping plate is reset, the control unit controls the servo motor to drive the wire feeding drive wheel to rotate again, so that the subsequently fed wire pushes the fixed-length material located between the inlet blade and the outlet blade to move along the transition guide groove, and the fixed-length material pushes the head waste material left in the blade hole of the outlet blade to move towards the discharge side, so that the fixed-length material and the head waste material are separated from the outlet blade and fall into the receiving box.

[0036] Beneficial effects:

[0037] As can be seen from the above technical solutions, the present invention provides a nickel-titanium alloy wire fixed-length cutting machine, which has the following beneficial effects:

[0038] 1. Reduce the impact of feeding clamping on the surface and cross-sectional shape of the filament: The clamping roller does not rigidly clamp the filament through a fixed gap, but rather applies adjustable elastic pressure to the roller mounting base via a compression spring. By changing the position of the clamping cover, the compression of the spring can be continuously adjusted to match the clamping force with the filament diameter, surface condition, and feeding resistance. The clamping roller can move up and down to accommodate local fluctuations in filament diameter or changes in the filament feeding resistance, thereby reducing filament flattening and surface indentations caused by rigid clamping. Simultaneously, the slide rail and slider restrict the vertical movement of the roller mounting base, reducing lateral sway of the clamping roller and ensuring a more stable elastic pressure between the feeding drive wheel and the filament, thus balancing anti-slip feeding and surface protection.

[0039] 2. Improve the straightness and positional stability of the wire entering the cutting area: Before entering the feeding mechanism, the wire passes sequentially through three staggered upper straightening rollers and four lower straightening rollers. The pressure of the upper straightening roller group can be adjusted according to the wire diameter and initial curvature, causing the wound wire to tend to be straight after multiple alternating bends. The straightening channel, wire feeding channel, inlet blade wire passage hole, transition guide groove, and outlet blade wire passage hole are arranged collinearly and aligned with the cutting section through transverse waist-shaped mounting holes, which can reduce the bending points and lateral forces of the wire in the feeding path. After straightening and alignment, the wire can enter the two blade assemblies along a unified center line, thereby reducing lateral offset, hole edge scraping, and end warping during cutting.

[0040] 3. Utilizing the mechanical distance between two cutting planes to limit the finished product length: The finished product length is not simply determined by the rotational displacement of the feed wheel, but directly by the fixed distance between the two cutting planes of the inlet and outlet blades. The single feed length is based on the target length plus a head waste allowance, allowing the filament to pass through both cutting positions simultaneously. After the two moving blades move down synchronously, the filament segment between the two cutting planes forms the finished product. Feeding errors are mainly reflected in the change in the head waste length outside the outlet blade, rather than being equivalently converted into finished product length errors. Utilizing the mechanical distance between the two cutting planes to limit the finished product length reduces the direct impact of the effective circumference error of the feed wheel, the slight slippage between the filament and the feed wheel, and servo start / stop deviations on the finished product length, helping to control the length deviation within 0.05mm.

[0041] 4. Reduced Action Time Difference Between Two Cutting Positions: Instead of separate drivers for the inlet and outlet blades, a single cylinder drives a cutting clamping plate spanning above the two moving blades. As the cutting clamping plate moves downwards, it acts on both moving blades simultaneously, ensuring that both cutting positions are controlled by the same pneumatic stroke. Compared to a structure where two drivers operate separately, the shared cylinder and cutting clamping plate reduce the cutting time difference caused by control signal delays, differences in pneumatic response, and differences in drive stroke. The synchronous shearing of both ends of the same wire segment by the two moving blades also reduces the possibility of wire springback, shifting, or rotation when cutting one end first and then the other, thereby improving the consistency of the cut conditions at both ends and the finished product length.

[0042] 5. An automated processing procedure is formed, consisting of continuous feeding, cutting, resetting, and ejection: After the double blades complete the cutting, the fixed-length material is temporarily held between the inlet blade, the transition guide groove, and the outlet blade, while the head waste remains in the blade hole of the outlet moving blade. After the cylinder and moving blade reset, there is no need for a separate robotic arm or ejection cylinder; the subsequently fed wire can push the fixed-length material towards the outlet side, and the fixed-length material further pushes the head waste out of the blade hole. If the fixed-length material is longer than 50mm, its front end, after being ejected from the outlet blade, can fall into the receiving box under gravity. This ejection method utilizes the next feeding cycle to complete the discharge of the material from the previous cycle, reducing material handling actions and additional actuators, and enabling continuous operation of feeding, cutting, and receiving at a uniform rhythm.

[0043] 6. Adaptable to different wire diameters and length specifications: The upper straightening wheel assembly of the seven-wheel straightener is adjustable vertically, and the elastic pressure of the clamping mechanism can be adjusted via clamping bolts, allowing the equipment to change the straightening amount and feeding clamping force according to different wire diameters. The cutting section can be adjusted perpendicular to the wire conveying direction to accommodate the alignment requirements of different blade holes and guide grooves; when the inlet blade is adjusted along the wire conveying direction, the distance between the two cutting planes can also be changed, thus forming different target lengths. Each functional component is mounted on the first to fifth mounting plates, and the feeding mechanism, pneumatic mechanism, and cutting mechanism have relatively independent mounting references, facilitating position calibration, blade replacement, and local maintenance, improving the equipment's adaptability to different processing specifications.

[0044] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.

[0045] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0046] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0047] Figure 1 This is a schematic diagram of the structure of a nickel-titanium alloy wire length cutting machine under the first angle in an embodiment of this application.

[0048] Figure 2 This is a schematic diagram of the structure of a nickel-titanium alloy wire length cutting machine under a second angle in an embodiment of this application.

[0049] Figure 3 This is a schematic diagram of the pressing device of a nickel-titanium alloy wire length cutting machine according to an embodiment of this application.

[0050] Explanation of icon numbers:

[0051] 1. Base; 101. First mounting plate; 102. Second mounting plate; 103. Third mounting plate; 104. Fourth mounting plate; 105. Fifth mounting plate; 2. Straightener; 3. Wire feeding drive wheel; 4. Pressure roller; 5. Pressure device; 501. Slide rail; 502. Slider; 503. Roller mounting base; 504. Compression spring; 505. Pressure cover; 506. Pressure bolt; 507. Bolt fixing base; 6. Cylinder; 7. Cutting and pressure plate; 8. Inlet blade; 9. Transition guide groove; 10. Outlet blade; 11. Solenoid valve; 12. Servo motor; 13. Wire spool. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0053] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0054] Small-diameter nickel-titanium alloy wires are characterized by high flexibility, low stiffness, and easy springback after cutting. When using rigid clamping for feeding, excessive clamping force can easily cause surface damage or cross-sectional deformation of the wire, while insufficient clamping force can easily lead to slippage. When the finished product length is directly determined by the feeding displacement, errors in the wire feeding wheel, wire slippage, and springback during start-stop operations will accumulate to the finished product length. When using single-blade cutting, there is a lack of stable constraint on one side of the wire cutting position, which can easily lead to lateral deviation, end warping, and irregular cuts. Furthermore, the cut material usually needs to be manually removed, which is not conducive to continuous processing.

[0055] Therefore, embodiments of the present invention provide a nickel-titanium alloy wire length-cutting machine, referring to... Figure 1 and Figure 2 It includes a base 1, a straightener 2, a feeding mechanism, a pressing mechanism, a double-blade cutting mechanism, a pneumatic drive mechanism, and a control unit.

[0056] The straightener 2, the feeding mechanism and the double-blade cutting mechanism are installed sequentially on the base 1 along the wire conveying direction.

[0057] The feeding mechanism includes a servo motor 12 fixed to the base 1 and a wire feeding drive wheel 3 coaxially connected to the output end of the servo motor 12.

[0058] The clamping mechanism includes a clamping device 5 mounted on the base 1 and located above the wire feeding drive wheel 3, and a clamping rubber wheel 4 rotatably mounted on the lower part of the clamping device 5. The clamping device 5 applies adjustable elastic pressure to the clamping rubber wheel 4, so that a wire feeding channel is formed between the clamping rubber wheel 4 and the wire feeding drive wheel 3.

[0059] The double-blade cutting mechanism includes an inlet blade 8, a transition guide groove 9, and an outlet blade 10 arranged sequentially downstream of the wire feeding drive wheel 3 along the wire conveying direction. Both the inlet blade 8 and the outlet blade 10 include a stationary blade, a moving blade, and an elastic reset member for resetting the moving blade upward. The stationary blade is fixed to the base 1, and the moving blade slides relative to the stationary blade in the up-down direction. The cutting planes of the inlet blade 8 and the outlet blade 10 are parallel to each other and spaced apart along the wire conveying direction, forming a fixed-length material limiting area between the two cutting planes. The transition guide groove 9 is fixed to the base 1 and located between the two cutting planes.

[0060] The inlet blade 8 and outlet blade 10 each have a stationary blade and a movable blade that slides up and down along the blade guide. When the movable blade is in the raised position, the wire passage hole on the movable blade is connected to the wire passage hole on the corresponding stationary blade, allowing the wire to pass through in the wire conveying direction. When the cutting clamping plate 7 moves downward, it acts on the upper ends of both movable blades, causing the cutting edge of the movable blade to move relative to the cutting edge of the corresponding stationary blade, thereby cutting the wire at the inlet blade 8 and outlet blade 10 respectively. After the cutting clamping plate 7 returns to its original position, the elastic reset member provided between the movable blade or the blade holder drives the movable blade to lift upward, while the blade holder has a limiting surface to prevent it from returning to the raised position, thus reconnecting the wire passage holes.

[0061] The pneumatic drive mechanism includes a cylinder 6 fixed to the base 1 and located above the double-blade cutting mechanism, a cutting clamping plate 7 connected to the piston rod of the cylinder 6 and spanning above the two moving blades, and a solenoid valve 11 connected to the air circuit of the cylinder 6. When the cutting clamping plate 7 moves down, it simultaneously presses against the two moving blades, so that the two moving blades cut synchronously relative to the corresponding stationary blades.

[0062] The control unit is electrically connected to the servo motor 12 and the solenoid valve 11 respectively.

[0063] This embodiment does not simply place a conventional single-blade cutting device after the servo feeding mechanism. Instead, it integrates two cutting positions spaced apart along the feeding direction, a transition guide groove 9 located between the two cutting positions, and a common pressure plate that simultaneously drives the two moving blades. The distance between the two cutting planes defines the length of the finished wire segment, and the servo feeding feeds the wire into the two cutting positions and provides a head waste allowance. Elastic clamping feeding, synchronous dual-blade shearing, and unified electrical control are all adapted to the material characteristics of small-diameter nickel-titanium alloy wire, which is highly flexible, easily springs back, and easily deformed under pressure.

[0064] After straightening, the filament is stably fed by the drive feed wheel 3 and the pressure roller 4. The elastic pressure reduces damage to the filament surface caused by rigid clamping. The two moving blades are synchronously driven by the same cutting pressure plate 7, ensuring that both ends of the filament segment form cuts within the same cutting cycle, reducing skewing and springback caused by sequential cutting. The finished product length is mainly determined by the mechanical distance between the two cutting planes, which reduces the direct impact of servo feeding errors on the finished product length and integrates straightening, feeding, cutting, and control into a complete automated processing equipment.

[0065] In some embodiments, reference is made to Figures 1 to 2 The base 1 includes a first mounting plate 101, a second mounting plate 102, a third mounting plate 103, a fourth mounting plate 104, and a fifth mounting plate 105;

[0066] The first mounting plate 101 is horizontally set, and the second mounting plate 102, the third mounting plate 103 and the fourth mounting plate 104 are vertically fixed to the first mounting plate 101. The horizontal direction parallel to the wire conveying direction is defined as the first horizontal direction, and the direction perpendicular to the first horizontal direction in the horizontal plane is defined as the second horizontal direction. The second mounting plate 102 and the fourth mounting plate 104 are spaced apart along the first horizontal direction, and the third mounting plate 103 is located on the same side of the second mounting plate 102 and the fourth mounting plate 104 along the second horizontal direction. The fifth mounting plate 105 is horizontally mounted on the upper end of the third mounting plate 103 and the fourth mounting plate 104, which are set at the same height.

[0067] The straightener 2, the wire feeding drive wheel 3, and the clamping mechanism are installed on the same side of the second mounting plate 102, and the servo motor 12 is installed on the other side of the second mounting plate 102; the solenoid valve 11 is installed on the third mounting plate 103, the cylinder 6 is installed on the fifth mounting plate 105, and the inlet blade 8, the transition guide groove 9, and the outlet blade 10 are installed on the first mounting plate 101.

[0068] The first mounting plate 101 forms the bottom mounting reference for each component; the second mounting plate 102 is used to mount the straightener 2, the feeding mechanism, and the clamping mechanism; the third mounting plate 103 is used to mount the solenoid valve 11; the fourth mounting plate 104, together with the third mounting plate 103, supports the fifth mounting plate 105, which is used to mount the cylinder 6. The mounting plates form a mutually supporting three-dimensional frame, allowing the feeding and cutting components to be arranged according to the wire conveying direction, and positioning the cylinder 6 above the two moving blades, thus creating a spatial layout of upper pneumatic drive, lower cutting, and side feeding.

[0069] The base 1 is not a single base plate used only to support components, but a frame structure with multiple mounting surfaces formed according to the feeding path, cutting position, and movement direction of the cylinder 6. The second mounting plate 102 provides a common axis reference for the feeding wheel and servo motor 12. The third mounting plate 103 and the fourth mounting plate 104 jointly support the fifth mounting plate 105, allowing the cylinder 6 to be stably positioned above the two moving blades. The cutting part is mounted on the first mounting plate 101, which can be used as a common adjustment reference for the wire feeding height and blade position. This layout can maintain the positional relationship of each actuator within a limited space. The multi-mounting plate base 1 sets the feeding mechanism, clamping mechanism, pneumatic mechanism, and cutting mechanism on their respective mounting surfaces, reducing mutual obstruction and installation interference between components. The servo motor 12 and the wire feeding drive wheel 3 are located on opposite sides of the second mounting plate 102, which helps to shorten the transmission connection and maintain coaxiality. The cylinder 6 is supported by an upper frame formed by the third mounting plate 103, the fourth mounting plate 104, and the fifth mounting plate 105, enabling the cutting pressure to be transmitted to the two moving blades in the vertical direction. Each mounting surface has a clearly defined function, facilitating assembly, debugging, maintenance, and replacement of the blade assembly.

[0070] In some embodiments, a filament feeding assembly disposed on the feed side of the straightener 2 is also included.

[0071] The wire feeding assembly includes a wire feeding base, two seated bearings, a wire feeding shaft, a wire spool 13, two tapered sleeves, and a locking head. The two seated bearings are fixed at intervals to the wire feeding base and rotatably support both ends of the wire feeding shaft. The two tapered sleeves are inserted into the wire feeding shaft from both ends of the inner hole of the wire spool 13 and sleeved on the wire feeding shaft to radially center the wire spool 13. The locking head is detachably locked to the wire feeding shaft and is located on the side of one of the tapered sleeves facing away from the wire spool 13, so that the two tapered sleeves clamp the wire spool 13 along the axial direction of the wire feeding shaft.

[0072] When assembling the wire spool 13, first install a tapered sleeve onto the wire feeding shaft, then fit the wire spool 13 onto the wire feeding shaft, allowing the tapered sleeve to enter from one end of the inner hole of the wire spool 13. Subsequently, insert another tapered sleeve from the other end of the inner hole of the wire spool 13, and axially lock the two tapered sleeves and the wire spool 13 using a locking head. The tapered surfaces of the two tapered sleeves mate with the two ends of the inner hole of the wire spool 13, ensuring that the center of the wire spool 13 is aligned with the center of the wire feeding shaft. When the feeding mechanism pulls the wire, the wire spool 13, the two tapered sleeves, and the wire feeding shaft rotate together relative to the bearing with a mounting seat.

[0073] In this embodiment of the wire feeding method, an independent wire feeding motor is not used. Instead, the wire spool 13 is driven to rotate by the traction force exerted on the wire by the feeding mechanism. Two tapered sleeves are centered from both ends of the inner hole of the wire spool 13, which can accommodate a certain range of inner hole sizes and keep the center of the wire spool 13 aligned with the center of the wire feeding shaft. The locking head adopts a detachable locking method, which can complete the replacement of the wire spool 13 while ensuring the axial stability of the wire spool 13. The passive wire feeding and the front-end servo feeding form a master-slave relationship, reducing the speed coordination problem between active wire feeding and active feeding.

[0074] The wire spool 13 rotates according to the actual feeding requirements under the traction of the wire, eliminating the need for a separate wire feeding speed control system. This reduces slack wire caused when the active wire feeding speed exceeds the feeding speed, and excessive stretching caused when the active wire feeding speed is lower than the feeding speed. Two seated bearings support both ends of the wire feeding shaft, which helps reduce the rotational runout of the wire spool 13. The tapered sleeve centering and axial locking of the locking head improve the installation stability of the wire spool 13, allowing the wire to enter the straightener 2 in a more stable position and facilitating the replacement of wire spools 13 of different specifications.

[0075] In some embodiments, the straightener 2 includes three upper straightening rollers located above the filament and four lower straightening rollers located below the filament, with the three upper straightening rollers and four lower straightening rollers arranged alternately along the filament conveying direction;

[0076] Three upper straightening rollers are rotatably mounted on the same upper roller seat, which moves vertically relative to the fixed frame of the straightener 2. The adjusting screw is threadedly connected to the fixed frame, and the lower end of the adjusting screw acts on the upper roller seat. When the adjusting screw is rotated, the amount of pressure of the three upper straightening rollers relative to the four lower straightening rollers is changed, so that a straightening channel for wires with a diameter of 0.5 mm to 1.5 mm is formed between the upper and lower straightening rollers.

[0077] Three upper straightening rollers and four lower straightening rollers are staggered along the wire conveying direction, allowing the wire to pass around each straightening roller in sequence and form an alternating bending path. By changing the pressure of the upper straightening roller group, the straightening effect can be adjusted according to the wire diameter and initial degree of curvature. The straightener 2 is preferably located upstream of the wire feeding drive roller 3, and the distance between the discharge side of the straightener 2 and the wire feeding drive roller 3 is 20mm, so that the straightened wire can enter the wire feeding channel with a shorter unsupported length and buffer the wire fluctuation caused by the start and stop of the wire spool 13.

[0078] The seven-roller staggered structure enables multiple alternating bending corrections of small-diameter filaments in a wound state, rather than relying solely on a pair of rollers for localized compression. The three upper straightening rollers are adjusted together, ensuring a correlation in the pressure applied by each roller, reducing discontinuities in the straightening path caused by individual adjustments. The pressure applied by the upper roller group can be adjusted according to the filament diameter and initial degree of bending, allowing the same straightener 2 to cover a certain filament diameter range and maintain correspondence with the height of the subsequent filament feeding channel.

[0079] After passing through multiple staggered straightening rollers, the curl of the wire gradually decreases, improving its straightness as it enters the feeding mechanism and the wire-passing hole of the blade. This improved straightness reduces friction between the wire and the walls of the wire-passing hole and the sidewalls of the transition guide groove 9, lowering feeding resistance and lateral deviation. The adjustable structure of the upper roller group allows the straightening action to match different wire diameters, preventing excessive reduction that could damage the wire surface, and also preventing insufficient reduction that could result in residual bending entering the cutting area.

[0080] In some embodiments, reference is made to Figure 3 The clamping device 5 includes a slide rail 501, a slider 502, a rubber wheel mounting base 503, a compression spring 504, a clamping cover 505, a clamping bolt 506, and a bolt fixing base 507.

[0081] The slide rail 501 is fixed to the second mounting plate 102 in the vertical direction. The slider 502 is slidably connected to the slide rail 501. The rubber wheel mounting base 503 is fixed to the slider 502. The pressure rubber wheel 4 is rotatably mounted on the rubber wheel mounting base 503.

[0082] The bolt fixing base 507 is fixed to the second mounting plate 102 and located above the rubber wheel mounting base 503. The clamping bolt 506 is threadedly connected to the bolt fixing base 507. The clamping cover 505 is movably disposed between the bolt fixing base 507 and the rubber wheel mounting base 503 along the axial direction of the clamping bolt 506. The lower end of the clamping bolt 506 abuts against the upper end face of the clamping cover 505. The upper part of the rubber wheel mounting base 503 is provided with a pin extending in the vertical direction. The lower part of the compression spring 504 is sleeved on the pin. The upper end of the compression spring 504 abuts against the clamping cover 505, and the lower end of the compression spring 504 abuts against the rubber wheel mounting base 503.

[0083] The clamping device 5 uses a vertical slide rail 501 and a slider 502 to limit the movement direction of the rubber wheel mounting base 503, and the clamping rubber wheel 4 is rotatably mounted on the rubber wheel mounting base 503. A bolt fixing base 507 is located above the rubber wheel mounting base 503, and a clamping bolt 506 is threadedly connected to the bolt fixing base 507. The lower end of the clamping bolt 506 acts on a clamping cover 505 that can move up and down. A compression spring 504 is disposed between the clamping cover 505 and the rubber wheel mounting base 503, and the lower part of the compression spring 504 is positioned by a pin. Rotating the clamping bolt 506 changes the compression amount of the compression spring 504, and the compression spring 504 applies elastic pressure to the clamping rubber wheel 4.

[0084] The clamping device 5 combines the adjustment of the rigid bolt with the force transmission of the elastic spring 504. The clamping bolt 506 does not directly fix the clamping roller 4 at a rigid height; instead, the pre-compression of the spring 504 is adjusted by the clamping cover 505, allowing the clamping roller 4 to float up and down with changes in the wire diameter while maintaining a basic clamping force. The slide rail 501 and the slider 502 restrict the movement direction of the roller mounting base 503, ensuring that the elastic displacement mainly occurs along the clamping direction, preventing lateral misalignment between the clamping roller 4 and the wire feeding drive wheel 3 during adjustment.

[0085] The compression spring 504 can absorb load fluctuations caused by minute changes in wire diameter, roundness errors of the wire feeding drive wheel 3, and changes in wire feeding resistance, making the force exerted by the clamping roller 4 on the wire relatively gentle. The clamping force can be changed by rotating the clamping bolt 506, without replacing the compression spring 504 or reinstalling the clamping roller 4. Appropriate elastic pressure can improve the friction transmission capacity between the wire feeding drive wheel 3 and the wire, reduce feeding slippage, and at the same time reduce indentations, flattening, and cross-sectional deformation caused by rigid clamping.

[0086] When the clamping bolt 506 is screwed in downwards, the clamping cover 505 moves downwards and increases the compression of the spring 504. The spring 504 applies downward elastic pressure to the clamping rubber wheel 4 through the rubber wheel mounting base 503. When the clamping bolt 506 is screwed out upwards, the clamping cover 505 moves upwards and decreases the compression of the spring 504. The rubber wheel mounting base 503 moves only in the vertical direction under the guidance of the slider 502 and the slide rail 501, thereby preventing the clamping rubber wheel 4 from shifting horizontally during adjustment. The clamping force should be adjusted to a state where the filament can be continuously fed without indentation, flattening, or significant plastic deformation on the surface.

[0087] In some embodiments, the center line of the straightening channel formed by the straightener 2, the center line of the wire feeding channel, the center line of the wire passage hole of the inlet blade 8, the center line of the groove of the transition guide groove 9, and the center line of the wire passage hole of the outlet blade 10 coincide with each other.

[0088] The inlet blade 8, the transition guide groove 9, and the outlet blade 10 together constitute the cutting section. The cutting section is installed on the first mounting plate 101 through a first waist-shaped mounting hole extending perpendicular to the wire conveying direction and fasteners passing through the first waist-shaped mounting hole, so that the position of the cutting section is adjusted perpendicular to the wire conveying direction.

[0089] The inlet blade 8 is adjustablely mounted on the first mounting plate 101 via a second waist-shaped mounting hole extending along the wire conveying direction and fasteners passing through the second waist-shaped mounting hole, so as to adjust the distance between the cutting plane of the inlet blade 8 and the cutting plane of the outlet blade 10.

[0090] The lateral position adjustment of the cutting section and the longitudinal position adjustment of the inlet blade 8 are two types of adjustments in different directions. Lateral position adjustment is used to align the inlet blade 8, transition guide groove 9, and outlet blade 10 with the straightening channel and wire feeding channel; longitudinal position adjustment is used to change the distance between the cutting planes of the inlet blade 8 and the outlet blade 10. During longitudinal adjustment, loosen the fasteners corresponding to the inlet blade 8, move the inlet blade 8 along the wire feeding direction until the distance between the two cutting planes reaches the target fixed length, and then tighten the fasteners. The space reserved between the wire feeding drive wheel 3 and the inlet blade 8 is to prevent interference between the inlet blade 8 and the wire feeding drive wheel 3 during adjustment.

[0091] The alignment of the wire feeding path and the adjustment of the finished product length are divided into two independent directions. When the entire cutting section moves laterally, the longitudinal distance between the two blades remains unchanged. This is mainly used to ensure that the wire feeding holes and transition guide groove 9 of the blades are collinear with the feeding path. When the inlet blade 8 moves longitudinally, the distance between the two cutting planes is changed. This is mainly used to set the finished product length. By setting separate lateral and longitudinal adjustment structures, the mutual influence between the two parameters caused by using the same adjustment structure to simultaneously handle alignment and length adjustment can be avoided.

[0092] After the center lines of all the wire feeding components are aligned, the wire can continuously enter the wire feeding channel, inlet blade 8, transition guide groove 9, and outlet blade 10 from the straightener 2, reducing bending, scraping, and jamming in the intermediate suspended section. The lateral adjustability of the cutting section can compensate for installation errors and differences in the position of different blade holes. The longitudinal adjustability of the inlet blade 8 can obtain fixed-length materials of different lengths by changing the mechanical distance between the two cutting planes, while keeping the outlet blade 10 and the take-up position unchanged, which helps to simplify the adjustment process between different length specifications.

[0093] In some embodiments, the upper ends of the two moving blades are at the same height, and the lower surface of the cutting clamping plate 7 is a plane that simultaneously covers the upper ends of the two moving blades.

[0094] The cylinder 6 is a double-acting cylinder with the piston rod facing downwards. The upper port is connected to the rodless chamber of the cylinder 6, and the lower port is connected to the rod chamber of the cylinder 6. When air enters through the lower port, the piston rod drives the cutting and pressing plate 7 to move upwards to the raised position where it is separated from the two moving blades. When air enters through the upper port, the piston rod drives the cutting and pressing plate 7 to move downwards and simultaneously pushes the two moving blades to complete the shearing.

[0095] The cutting clamping plate 7 spans across the inlet blade 8 and the outlet blade 10, with the pressure-bearing ends of the two moving blades located within the projection range of the lower surface of the cutting clamping plate 7. When the cutting clamping plate 7 moves downwards, the time difference between its lower surface contacting the two moving blades should be controlled within a range that does not affect synchronous shearing. Preferably, the pressure-bearing ends of the two moving blades are at the same height, and the lower surface of the cutting clamping plate 7 is parallel to the two pressure-bearing ends. Driving the two moving blades with the same cylinder 6 and the same cutting clamping plate 7 can reduce the time difference in action that would occur if two separate actuators were used.

[0096] The two blade assemblies are structurally independent, allowing for a complete shearing relationship between the moving and stationary blades at each cutting position. Both blade assemblies are driven by the same cutting clamping plate 7, providing a common actuation source for both independent shearing positions. This structure balances independent blade assembly installation with synchronized control of the cutting action. The use of a reversing cylinder 6 at its upper and lower interfaces eliminates the need for separate motors, cams, or independent cylinders 6 for the two moving blades, reducing the possibility of asynchronous actions at the two cutting positions.

[0097] The same cutting clamping plate 7 can transmit downward pressure in the same direction to the two moving blades, enabling them to complete the shearing within the same stroke of the cylinder 6. With the reduced time difference between the two cutting positions, the wire segment located between the two blades is less prone to springback, rotation, or axial movement during the cutting process due to one end breaking first. After the cylinder 6 resets, the cutting clamping plate 7 disengages from the moving blades, and the moving blades can return to their wire-passing state under the action of the reset element, providing a channel for the next feeding.

[0098] In some embodiments, the control unit includes a programmable logic controller and has a parameter setting interface for setting the target fixed length of material, the single feeding length, the feeding speed, and the cutting cycle.

[0099] The servo motor 12 includes a servo encoder and adopts a pulse positioning control mode. The control unit outputs pulse commands and direction commands to the servo motor 12. The total number of pulses in the pulse command is used to determine the target rotation angle of the servo motor 12. The servo encoder is used to provide feedback on the actual rotation angle of the servo motor 12. The servo motor 12 directly drives the wire feeding drive wheel 3 to rotate. The control unit determines the current feeding length based on the actual rotation angle of the servo motor 12 and the effective circumference of the wire feeding drive wheel 3.

[0100] The control unit pre-stores the number of pulses per revolution of the servo motor 12 and the effective circumference of the wire feeding drive wheel 3. The servo motor 12 is directly connected to the wire feeding drive wheel 3 without an intermediate speed change mechanism. The control unit determines the total number of pulses to be output based on the single feeding length to be executed, and uses the motor rotation angle fed back by the servo encoder to determine whether the servo motor 12 has reached the correct position. The effective circumference of the wire feeding drive wheel 3 should be determined through actual feeding calibration to reduce the impact of wheel manufacturing errors, surface wear, and clamping deformation on the feeding conversion results.

[0101] The servo motor 12 is directly connected to the wire feeding drive wheel 3, reducing the backlash and transmission ratio error of the intermediate transmission mechanism. Encoder feedback is used to confirm whether the motor rotation angle has reached the target value, while the clamping device 5 is used to maintain the friction transmission conditions between the wire and the wire feeding drive wheel 3. The control parameters and the mechanical double-blade spacing work together to ensure that the servo feeder is responsible for delivering the wire to the cutting area, and the double-blade spacing is responsible for limiting the finished product length.

[0102] Pulse positioning control enables repeated control of the motor rotation angle for each feeding, while the servo encoder provides feedback on the actual motor motion state, reducing feeding discrepancies caused by the start-stop inertia of ordinary motors. The direct drive structure reduces intermediate error sources beyond coupling transmission. The control unit adjusts pulse commands and operating rhythm according to different target lengths and feeding speeds, coordinating with the cylinder 6's cut-off timing to create a repeatable automatic control cycle of feeding, stopping, cutting off, and resetting.

[0103] In some embodiments, the control unit is configured to:

[0104] When the wire reaches the single feeding length based on the actual rotation angle fed back by the servo encoder, the servo motor 12 is controlled to stop rotating. While the servo motor 12 remains stopped, the solenoid valve 11 is controlled to switch directions, allowing air to enter the upper interface of the cylinder 6 to drive the cutting and pressing plate 7 to move downward.

[0105] The upper port of cylinder 6 is kept in the air intake state for 2 seconds to form a cut-off holding time. After the cut-off holding time expires, the control solenoid valve 11 is reversed again, so that the lower port of cylinder 6 is allowed to enter air and drive the cut-off clamping plate 7 to reset.

[0106] The feeding, cutting, and reset phases are sequentially interlocked. During the feeding phase, only the servo motor 12 is allowed to feed, while the cylinder 6 remains in the raised position. Only after the servo motor 12 completes a single feeding and stops can the cylinder 6 be controlled to move downwards. Only after the cylinder 6 completes the cutting and returns to the raised position can the next feeding begin. The cutting hold time is used to ensure that both moving blades complete the entire cutting stroke. In this embodiment, it is set to 2 seconds. In actual applications, this time should be verified based on the cylinder 6 stroke, air supply pressure, blade movement resistance, and wire diameter to ensure that it covers the complete cutting action.

[0107] The control process employs a sequential interlock between the feeding and cutting actions. The cutting action is performed only after the servo motor 12 stops, and the next feeding occurs only after the cutting clamping plate 7 and the two moving blades have reset. A 2-second hold time is set during the downward pressing phase of cylinder 6, ensuring that cylinder 6 not only delivers a momentary impact but also maintains sufficient driving force to cover the entire cutting stroke of the moving blades. This timing combines servo position control and pneumatic reversing control into a complete processing cycle, preventing simultaneous feeding and cutting. Keeping the servo motor 12 stopped during cutting reduces axial movement of the wire during blade shearing, which can cause cut tilting, pulling, and length changes. The downward pressing state of cylinder 6 ensures that the two moving blades pass their respective shearing positions and complete wire separation. Resuming feeding after cylinder 6 resets prevents the wire from impacting the blade holes before the cutting clamping plate 7 or the moving blades have lifted. Sequential control improves the stability of continuous processing and facilitates setting the processing cycle based on the feeding speed and cylinder 6's action time.

[0108] In some embodiments, the target fixed-length material length is equal to the distance between the cutting plane of the inlet blade 8 and the cutting plane of the outlet blade 10, and the single feeding length is the sum of the target fixed-length material length and the 1.5mm head waste allowance length, and the target fixed-length material length is greater than 50mm.

[0109] The moving blade of the exit blade 10 is provided with a blade hole that is adapted to the outer diameter of the wire to be processed and allows only a single wire to pass through. The exit side of the exit blade 10 is provided with a receiving box.

[0110] After the cutting and clamping plate 7 is reset, the control unit controls the servo motor 12 to drive the wire feeding drive wheel 3 to rotate again, so that the subsequently fed wire pushes the fixed-length material located between the inlet blade 8 and the outlet blade 10 to move along the transition guide groove 9, and the fixed-length material pushes the head waste material left in the blade hole of the outlet blade 10 to move towards the discharge side, so that the fixed-length material and the head waste material are separated from the outlet blade 10 and fall into the receiving box.

[0111] The target fixed-length material and the single-feed length are different parameters. The target fixed-length material is determined by the mechanical distance between the cutting planes of the inlet blade 8 and the outlet blade 10; the single-feed length is the feeding control parameter obtained by adding a 1.5mm head waste allowance to the target fixed-length material. After the dual-blade synchronous cutting is completed, the wire segment between the two cutting planes constitutes the fixed-length material, and a head waste of approximately 1.5mm in length is formed on the outer side of the cutting plane of the outlet blade 10.

[0112] For wires of different diameters, an exit moving blade with a corresponding blade hole diameter should be selected. The blade hole and a single wire form a clearance fit, allowing the wire to pass through axially while preventing two wires from entering the blade hole side by side.

[0113] The distance between the two cutting planes directly forms the finished product length benchmark. The increased feed rate of 1.5mm is used to form controllable head scrap outside the exit blade 10, rather than being incorporated into the finished product length. The blade hole of the exit blade 10 temporarily restricts the head scrap after cutting. The next feed utilizes the axial thrust between the filament and the fixed-length material to complete the discharge of the finished product and scrap. This method eliminates the need for a separate clamping or ejection mechanism for the cut material. By using the distance between the mechanical cutting planes to determine the finished product length, the feeding error can be mainly absorbed by the head scrap length, reducing the direct impact of feed wheel circumference error and slight slippage on the finished product length. The blade hole can provide axial guidance for the filament head before and after cutting, keeping the head scrap in a predetermined position. Subsequent feeding simultaneously handles the feeding of the next processing cycle and the discharge of the previous processing cycle, reducing the need for additional actuators and independent discharge time. Fixed-length materials longer than 50mm, after being ejected from the exit blade 10, can fall into the collection box under gravity, achieving continuous collection.

[0114] The following provides an operation method for the nickel-titanium alloy wire fixed-length cutting machine according to an embodiment of this application:

[0115] Step S1: Select blade and adjust cutting length.

[0116] Based on the diameter of the nickel-titanium alloy wire to be processed, select an inlet blade 8 and an outlet blade 10 whose blade holes are compatible with the outer diameter of the wire. Adjust the position of the inlet blade 8 along the wire conveying direction according to the target fixed length of the material, so that the distance between the cutting plane of the inlet blade 8 and the cutting plane of the outlet blade 10 is equal to the target fixed length of the material, and then lock the inlet blade 8.

[0117] Step S2: Center the feeding path.

[0118] Loosen the transverse fasteners of the cutting section, and adjust the positions of the inlet blade 8, the transition guide groove 9, and the outlet blade 10 along the direction perpendicular to the wire feeding direction so that the center line of the straightening channel, the center line of the wire feeding channel, the center line of the wire hole of the inlet blade 8, the center line of the groove of the transition guide groove 9, and the center line of the wire hole of the outlet blade 10 coincide with each other. After completing the centering, lock the cutting section.

[0119] Step S3: Feeding and threading the material.

[0120] The wire spool 13 is installed on the wire feeding shaft, centered by two tapered sleeves, and axially locked by a locking head. The wire is drawn out from the wire spool 13 and passes sequentially through the straightener 2, the wire feeding channel between the wire feeding drive wheel 3 and the pressure roller 4, the inlet blade 8, the transition guide groove 9, and the outlet blade 10. During the initial wire feeding, the head of the wire passes through the inlet blade 8.

[0121] Step S4: Adjust the straightening amount and clamping force.

[0122] Adjust the adjusting screw of the straightener 2 according to the wire diameter and initial curvature to adjust the pressure of the upper straightening roller group relative to the lower straightening roller group. Rotate the clamping bolt 506 to change the compression of the compression spring 504, so that the clamping rubber roller 4 presses the wire against the wire feeding drive roller 3 with elastic pressure. Adjust the clamping force so that the wire does not slip when the wire feeding drive roller 3 rotates, and the wire surface does not produce indentations, flattening or obvious plastic deformation.

[0123] Step S5: Set control parameters.

[0124] The target fixed-length material, single-feed length, feeding speed, and cutting cycle are set in the control unit. The single-feed length is set as the sum of the target fixed-length material and the 1.5mm head waste allowance. The control unit determines the total number of pulse commands for the servo motor 12 based on the single-feed length.

[0125] Step S6: Fixed-length feeding.

[0126] The control solenoid valve 11 allows air to enter the lower port of cylinder 6, keeping the cutting and clamping plate 7 in the raised position. The control unit starts the servo motor 12, which directly drives the wire feeding drive wheel 3 to rotate. The clamping rubber wheel 4 rotates with the movement of the wire, and the wire spool 13 passively feeds the wire under the traction of the wire. The control unit determines the feeding length based on the motor rotation angle fed back by the servo encoder, and stops the servo motor 12 when the single feeding length is reached.

[0127] Step S7: Simultaneous cutting with both blades.

[0128] With the servo motor 12 stationary, the solenoid valve 11 is switched, allowing air to enter through the upper interface of cylinder 6. Cylinder 6 drives the cutting clamping plate 7 to move downwards, which simultaneously pushes the moving blades of the inlet blade 8 and the outlet blade 10 downwards, causing the two moving blades to complete the shearing relative to their corresponding stationary blades. The wire segment between the two cutting planes forms a fixed-length material, and the outer side of the outlet blade 10 forms a head waste. The air intake state of the upper interface of cylinder 6 is maintained for 2 seconds to ensure that the two moving blades complete the cutting stroke.

[0129] Step S8: Blade reset and material ejection.

[0130] The control solenoid valve 11 reverses again, allowing air to enter the lower port of cylinder 6 and driving the cutting and clamping plate 7 to reset upwards. The two moving blades return to the raised position under the action of the reset component. Then, the servo motor 12 is started again, causing the subsequently fed wire to push the fixed-length material along the transition guide groove 9 towards the outlet blade 10. The fixed-length material pushes the head waste material left in the blade hole of the outlet blade 10 outwards, so that the fixed-length material and the head waste material detach from the outlet blade 10 and fall into the receiving box.

[0131] Step S9, repeat the process.

[0132] The control unit repeatedly executes the fixed-length feeding, double-blade synchronous cutting, blade reset and material ejection process according to the set cutting rhythm until the set processing quantity is reached, the wire on the wire spool 13 is used up, or a stop command is received.

[0133] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A nickel-titanium alloy wire length-cutting machine, characterized in that, It includes a base, straightener, feeding mechanism, clamping mechanism, double-blade cutting mechanism, pneumatic drive mechanism, and control unit; The straightener, the feeding mechanism, and the double-blade cutting mechanism are sequentially installed on the base along the wire conveying direction; The feeding mechanism includes a servo motor fixed to the base and a wire feeding drive wheel coaxially connected to the output end of the servo motor. The pressing mechanism includes a pressing device mounted on the base and located above the wire feeding drive wheel, and a pressing rubber wheel rotatably mounted on the lower part of the pressing device. The pressing device applies adjustable elastic pressure to the pressing rubber wheel to form a wire feeding channel between the pressing rubber wheel and the wire feeding drive wheel. The double-blade cutting mechanism includes an inlet blade, a transition guide groove, and an outlet blade arranged sequentially downstream of the wire feeding drive wheel along the wire conveying direction. Both the inlet blade and the outlet blade include a stationary blade, a moving blade, and an elastic reset member for resetting the moving blade upwards. The stationary blade is fixed to the base, and the moving blade slides relative to the stationary blade in a vertical direction. The cutting planes of the inlet blade and the outlet blade are parallel to each other and spaced apart along the wire conveying direction, forming a fixed-length material limiting area between the two cutting planes. The transition guide groove is fixed to the base and located between the two cutting planes. The pneumatic drive mechanism includes a cylinder fixed to the base and located above the double-blade cutting mechanism, a cutting clamping plate connected to the piston rod of the cylinder and spanning above the two moving blades, and a solenoid valve connected to the air circuit of the cylinder. When the cutting clamping plate moves down, it simultaneously presses against the two moving blades, so that the two moving blades cut synchronously relative to the corresponding stationary blades. The control unit is electrically connected to the servo motor and the solenoid valve, respectively.

2. The nickel-titanium alloy wire length-cutting machine according to claim 1, characterized in that, The base includes a first mounting plate, a second mounting plate, a third mounting plate, a fourth mounting plate, and a fifth mounting plate; The first mounting plate is horizontally positioned, and the second, third, and fourth mounting plates are vertically fixed to the first mounting plate. A first horizontal direction is defined as the horizontal direction parallel to the wire conveying direction, and a second horizontal direction is defined as the direction perpendicular to the first horizontal direction within the horizontal plane. The second and fourth mounting plates are spaced apart along the first horizontal direction, and the third mounting plate is located on the same side of the second and fourth mounting plates along the second horizontal direction. The fifth mounting plate is horizontally mounted on the upper end of the third and fourth mounting plates, which are set at the same height. The straightener, the wire feeding drive wheel, and the clamping mechanism are mounted on the same side of the second mounting plate, and the servo motor is mounted on the other side of the second mounting plate; the solenoid valve is mounted on the third mounting plate, the cylinder is mounted on the fifth mounting plate, and the inlet blade, the transition guide groove, and the outlet blade are mounted on the first mounting plate.

3. The nickel-titanium alloy wire length-cutting machine according to claim 1, characterized in that, It also includes a yarn feeding assembly disposed on the feed side of the straightener; The wire feeding assembly includes a wire feeding base, two seated bearings, a wire feeding shaft, a wire spool, two tapered sleeves, and a locking head. The two seated bearings are fixedly spaced on the wire feeding base and rotatably support both ends of the wire feeding shaft. The two tapered sleeves are inserted into the wire feeding shaft from both ends of the inner hole of the wire spool and fitted onto the wire feeding shaft to radially center the wire spool. The locking head is detachably locked to the wire feeding shaft and is located on the side of one of the tapered sleeves facing away from the wire spool, so that the two tapered sleeves clamp the wire spool along the axial direction of the wire feeding shaft.

4. The nickel-titanium alloy wire length-cutting machine according to claim 1, characterized in that, The straightener includes three upper straightening rollers located above the filament and four lower straightening rollers located below the filament, with the three upper straightening rollers and the four lower straightening rollers arranged alternately along the filament conveying direction; The three upper straightening rollers are rotatably mounted on the same upper roller seat, which moves vertically relative to the fixing frame of the straightener. An adjusting screw is threadedly connected to the fixing frame, and the lower end of the adjusting screw acts on the upper roller seat. When the adjusting screw is rotated, the amount of pressure of the three upper straightening rollers relative to the four lower straightening rollers is changed, so that a straightening channel for wires with a diameter of 0.5 mm to 1.5 mm is formed between the upper and lower straightening rollers.

5. A nickel-titanium alloy wire length-cutting machine according to claim 2, characterized in that, The clamping device includes a slide rail, a slider, a rubber wheel mounting base, a compression spring, a clamping cover, a clamping bolt, and a bolt fixing base; The slide rail is fixed to the second mounting plate in the vertical direction, the slider is slidably connected to the slide rail, the rubber wheel mounting base is fixed to the slider, and the pressing rubber wheel is rotatably mounted on the rubber wheel mounting base; The bolt fixing base is fixed to the second mounting plate and located above the rubber wheel mounting base. The clamping bolt is threadedly connected to the bolt fixing base. The clamping cover is movably disposed between the bolt fixing base and the rubber wheel mounting base along the axial direction of the clamping bolt. The lower end of the clamping bolt abuts against the upper end face of the clamping cover. The upper part of the rubber wheel mounting base is provided with a pin extending in the vertical direction. The lower part of the compression spring is sleeved on the pin. The upper end of the compression spring abuts against the clamping cover, and the lower end of the compression spring abuts against the rubber wheel mounting base.

6. A nickel-titanium alloy wire length-cutting machine according to claim 2, characterized in that, The center lines of the straightening channel formed by the straightener, the center line of the wire feeding channel, the center line of the wire passage hole of the inlet blade, the center line of the groove of the transition guide groove, and the center line of the wire passage hole of the outlet blade coincide with each other. The inlet blade, the transition guide groove, and the outlet blade together constitute the cutting section. The cutting section is installed on the first mounting plate through a first waist-shaped mounting hole extending perpendicular to the wire conveying direction and fasteners passing through the first waist-shaped mounting hole, so that the position of the cutting section is adjusted perpendicular to the wire conveying direction. The inlet blade is adjustablely mounted on the first mounting plate via a second waist-shaped mounting hole extending along the wire conveying direction and a fastener passing through the second waist-shaped mounting hole, so as to adjust the distance between the cutting plane of the inlet blade and the cutting plane of the outlet blade.

7. A nickel-titanium alloy wire length-cutting machine according to claim 1, characterized in that, The upper ends of the two moving blades are at the same height, and the lower surface of the cutting clamping plate is a plane that simultaneously covers the upper ends of the two moving blades; The cylinder is a double-acting cylinder with the piston rod facing downwards. The upper port is connected to the rodless chamber of the cylinder, and the lower port is connected to the rod chamber of the cylinder. When air enters through the lower port, the piston rod drives the cutting and pressing plate to move upwards to the raised position where it is separated from the two moving blades. When air enters through the upper port, the piston rod drives the cutting and pressing plate downwards and simultaneously pushes the two moving blades to complete the shearing.

8. A nickel-titanium alloy wire length-cutting machine according to claim 1, characterized in that, The control unit includes a programmable logic controller and has a parameter setting interface, which is used to set the target fixed length of material, the single feeding length, the feeding speed and the cutting cycle. The servo motor includes a servo encoder and adopts a pulse positioning control mode. The control unit outputs pulse commands and direction commands to the servo motor. The total number of pulses in the pulse command is used to determine the target rotation angle of the servo motor. The servo encoder is used to provide feedback on the actual rotation angle of the servo motor. The servo motor directly drives the wire feeding drive wheel to rotate, and the control unit determines the current feeding length based on the actual rotation angle of the servo motor and the effective circumference of the wire feeding drive wheel.

9. A nickel-titanium alloy wire length-cutting machine according to claim 8, characterized in that, The control unit is configured to: When the wire reaches the single feeding length based on the actual rotation angle fed back by the servo encoder, the servo motor is controlled to stop rotating, and the solenoid valve is controlled to switch direction while the servo motor is stopped, so that air enters the upper interface of the cylinder to drive the cutting and pressing plate to move down. The upper port of the cylinder is kept in the air intake state for 2 seconds to form a cut-off holding time; after the cut-off holding time expires, the solenoid valve is controlled to switch direction again, so that the lower port of the cylinder is allowed to enter air and drive the cut-off clamping plate to reset.

10. A nickel-titanium alloy wire length-cutting machine according to claim 9, characterized in that, The target fixed-length material length is equal to the distance between the cutting plane of the inlet blade and the cutting plane of the outlet blade, the single feeding length is the sum of the target fixed-length material length and the 1.5mm head waste allowance length, and the target fixed-length material length is greater than 50mm; The moving blade of the outlet blade is provided with a blade hole that is adapted to the outer diameter of the wire to be processed and allows only a single wire to pass through. The outlet side of the outlet blade is provided with a receiving box. After the cutting and clamping plate is reset, the control unit controls the servo motor to drive the wire feeding drive wheel to rotate again, so that the subsequently fed wire pushes the fixed-length material located between the inlet blade and the outlet blade to move along the transition guide groove, and the fixed-length material pushes the head waste material left in the blade hole of the outlet blade to move towards the discharge side, so that the fixed-length material and the head waste material are separated from the outlet blade and fall into the receiving box.

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