KR20180126111A - Apparatus for manufacturing shape memory alloy spring continuously, method of manufacturing shape memory alloy spring continuoulsy and shape memory alloy spring manufactured thereby - Google Patents

Abstract

According to an embodiment of the present invention, provided are an apparatus for continuously manufacturing a shape memory alloy spring to continuously form and mass-produce a shape memory alloy spring having a connection portion, a method of continuously manufacturing a shape memory alloy spring, and a shape memory alloy spring manufactured thereby. Moreover, the apparatus for continuously manufacturing a shape memory alloy spring comprises a first unwinding unit, a first rotation unit, a second unwinding unit, a first fixing unit, a second fixing unit, and a first winding unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a continuous manufacturing method of a shape memory alloy spring, a continuous manufacturing method of a shape memory alloy spring, and a shape memory alloy spring manufactured thereby and a shape memory alloy springs THEREBY}

The present invention relates to an apparatus for continuously manufacturing a shape memory alloy spring, a method for continuously manufacturing a shape memory alloy spring, and a shape memory alloy spring produced thereby. More particularly, the present invention relates to a shape memory alloy spring, A method for continuously manufacturing a shape memory alloy spring, and a shape memory alloy spring manufactured by the method.

Generally, a thermal reaction driving device is a material that can convert thermal energy into mechanical energy and is widely applied to artificial muscles. Artificial muscles can be made to react by external electrical input to perform substitute function of living muscles. Artificial muscles can be used for rehabilitation robots, which usually serve as limbs for disabled persons with difficult physical activities, or as work robots that perform tasks in special environments where human beings are difficult to work directly, such as space exploration or submarine exploration or nuclear power plants. Artificial muscles are further designed for use in advanced products such as microelectromechanical systems (MEMS) for ultra-compact and highly complex motions.

The shape memory alloy (SMA), which is one of the thermal reaction drive elements, is deformed by the transformation of the martensite phase, not by the displacement of the potential at the time of plastic deformation, and transformed into the austenite phase on the martensite, And is restored to the shape before deformation. The characteristics required for the artificial muscle are to ensure a flexible and rapid reaction like the biomechanics. The shape memory alloy whose shape changes according to the temperature is suitable material.

Generally, in order to be applied to artificial muscles, shape memory alloy springs made using shape memory alloy wires are used.

FIG. 1 is an exemplary view for explaining a conventional shape memory alloy spring manufacturing process, and FIG. 2 is an illustration showing an example of a shape memory alloy spring manufactured by a conventional shape memory alloy spring manufacturing process.

As shown in FIGS. 1 and 2, a shape memory alloy wire 10 is conventionally wound in a coil shape on a rod 20, the shape memory alloy wire 10 wound thereon is heat-treated, And is made of a memory alloy spring 30.

In this method, however, the shape memory alloy wire 10 is wound on the rod 20 by a length equal to or longer than the required length of the shape memory alloy spring 30 and then cut to obtain the shape memory alloy spring 30 of the required length do.

However, in this case, the shape memory alloy springs A obtained at both ends may have a connecting portion 31 having a required length at one end, but a connecting portion having a required length can not be formed at the other end. In addition, the shape memory alloy spring 30 obtained in the intermediate portion B has a problem that a connection portion 32 having a required length can not be obtained at both ends. 2, since the shape memory alloy springs 30 obtained in the intermediate portion B are obtained by cutting in the form of a coil, the connection portions 32 having a required length are formed at both ends of the body portion 33 It does not. Such a connection portion having a required length may be a problem that makes it difficult to assemble the shape memory alloy spring in the artificial muscle assembly process.

In order to form a connection portion having a sufficiently long length at both ends, a shape memory alloy spring can be obtained by winding a shape memory alloy wire in a single spring unit on the rods 20. However, this method is not suitable for obtaining a large amount of shape memory alloy springs It is not suitable for. In addition, the operation of winding the shape memory alloy wire on the rods 20 is performed manually by a person, and it is necessary to improve such a working environment.

Korean Published Patent Application No. 2011-0024977 (Published on Mar. 9, 2011)

In order to solve the above problems, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an apparatus for continuously manufacturing a shape memory alloy spring capable of continuously forming a shape memory alloy spring having a connection portion, And a shape memory alloy spring produced thereby.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a semiconductor device comprising: a first unwinding unit for winding a wound base wire; A first rotating part having a first through hole through which the base wire is fed through the first unwinding part and is rotated about a central axis of the first through hole; A plurality of unit spring shapes are continuously formed on the outer circumferential surface of the base wire, which is supplied through the first rotating portion, while the shape memory alloy wire wound on the first rotating portion is rotated together with the first rotating portion A second unwinding unit for allowing the first winding unit to rotate; Wherein a front end portion and a rear end portion of the shape memory alloy wire to be unwound by the second unwinding portion are respectively bound to the base wire supplied through the first rotation portion, government; And a first winding portion around which the base wire wound around the shape memory alloy wire is wound.

The control unit may further include a control unit for controlling the rotation speed of the first rotation unit such that the first rotation unit alternately rotates at a first rotation speed and a second rotation speed that is slower than the first rotation speed, Wherein the shape memory alloy wire is wound on the base wire at a first pitch to form a body portion of the unit spring at the first rotation speed and at the second rotation speed, A connecting portion may be formed at both ends of the body portion of the unit spring.

In the embodiment of the present invention, the second unwinding unit may simultaneously perform the first rotation about the center axis of the first rotation unit and the second rotation around the rotation axis provided in the radial direction of the first rotation unit have.

In the embodiment of the present invention, the core wire has a third unwinding portion to which the wound core wire is unwound, and a second through hole through which the core wire is fed through the third unwinding portion, And a second rotation part provided on the second rotation part and rotated together with the second rotation part to be wound on an outer circumferential surface of the core wire supplied through the second rotation part while being wound around the circumferential wire wound around the second rotation part, A fourth unwinding portion for allowing the shape memory alloy wire to be formed, and a front end portion and a rear end portion of the circumferential wire to be loosened in the fourth unwinding portion are bound to the core wire supplied through the second rotation portion, Further comprising a wire manufacturing section having a third fixing section and a fourth fixing section which are carried together with the core wire, wherein the core wire It may be wound around the winding part 2.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising the steps of: a) rotating a first rotating part having a first through hole penetrating in an axial direction; 1 through a through hole; b) a shape memory alloy wire wound around a second unwinding portion provided in the first rotation portion and rotating together with the first rotation portion is loosened, and a front end portion of the shape memory alloy wire is connected to the first through- Bonding to the base wire supplied through the ball; c) a shape memory alloy wire that is unwound in the second unwinding portion is wound on an outer circumferential surface of the base wire supplied through the first rotating portion to form a plurality of unit spring shapes continuously; d) a rear end of the shape memory alloy wire that is unwound in the second unwinding portion is coupled to the base wire supplied through the first rotation portion by the second fixing portion so that the shape release of the plurality of unit springs is prevented step; And e) the base wire wound with the shape memory alloy wire wound around the first winding part is separated from the first winding part.

In the embodiment of the present invention, after the step (e), a heat treatment step in which the base wire wound with the shape memory alloy wire is heat-treated so as to be heated at a high temperature and stored in a spring shape, And a spring obtaining step of obtaining a plurality of individual units of shape memory alloy springs including a part and a connecting part.

In the embodiment of the present invention, further comprising the step of cutting the heat treated shape memory alloy wire and the base wire between the heat treatment step and the spring obtaining step, the cutting being performed at a center of each connecting portion .

In the embodiment of the present invention, the shape memory alloy wire that is unwound in the second unwinding portion is rotated in a second rotation part having a second through hole formed in the axial direction, and the core wire wound in the third unwinding part Wherein the first wire is fed through the second through hole and the circumferential wire wound around a fourth unwinding portion provided in the second rotating portion and rotating together with the second rotating portion is loosened, The core wire being wound on the outer circumferential surface of the core wire supplied through the second rotating portion and being wound by the fourth unwinding portion; And a rear end of the circumferential wire that is loosened in the fourth unwinding portion passes through the second rotation portion by the fourth fixing portion so that the circumferential wire is prevented from being loosened Class can be prepared by the steps which binds to the core wire.

According to an aspect of the present invention, there is provided a shape memory alloy spring manufactured by a method for continuously manufacturing a shape memory alloy spring.

In an embodiment of the present invention, the shape memory alloy wire has a core wire and a circumferential wire wound around the core wire, and the core wire and the circumferential wire may be a shape memory alloy.

In an embodiment of the present invention, the shape memory alloy wire has a core wire and a circumferential wire wound around the core wire, the core wire is a shape memory alloy, and the circumferential wire Resistance material.

In an embodiment of the present invention, an insulating layer may be further provided between the core wire and the circumferential wire to electrically insulate the circumferential wire from the core wire.

According to the embodiment of the present invention, the pitch of the shape memory alloy wire wound around the base wire can be adjusted by controlling the rotational speed of the first rotating portion. As a result, the body portion and the connecting portion of the shape memory alloy wire can be easily formed, and a plurality of shape memory alloy springs can be continuously formed.

It should be understood that the effects of the present invention are not limited to the effects described above, but include all effects that can be deduced from the description of the invention or the composition of the invention set forth in the claims.

FIG. 1 is an exemplary view for explaining a conventional shape memory alloy spring manufacturing process. FIG.
Fig. 2 is an illustration showing an example of a shape memory alloy spring manufactured by a conventional shape memory alloy spring manufacturing process.
FIGS. 3 to 5 are views illustrating an apparatus for continuously manufacturing a shape memory alloy spring according to a first embodiment of the present invention. FIG.
6 is an exemplary view showing the first rotating portion of the apparatus for continuously manufacturing a shape memory alloy spring according to the first embodiment of the present invention.
7 is a flowchart showing a method for continuously manufacturing a shape memory alloy spring according to the first embodiment of the present invention.
8 is an exemplary view showing a shape memory alloy spring according to a first embodiment of the present invention.
FIGS. 9 and 10 are views showing examples of a wire manufacturing section of the apparatus for continuously manufacturing a shape memory alloy spring according to a second embodiment of the present invention.
11 and 12 are cross-sectional illustrations of a shape memory alloy wire of a shape memory alloy spring according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as " comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 3 to 5 are views showing an apparatus for continuously manufacturing a shape memory alloy spring according to a first embodiment of the present invention, and FIG. 6 is a sectional view of the apparatus for continuously manufacturing a shape memory alloy spring according to the first embodiment of the present invention. Fig. 8 is an exemplary view showing the first rotating portion as a center.

3 to 6, the apparatus for continuously manufacturing a shape memory alloy spring includes a first unwinding part 110, a first rotating part 120, a second unwinding part 130, And may include a first fixing part 140, a second fixing part 150, and a first winding part 160.

In the first unwinding portion 110, the wound base wire 210 may be loosened. The base wire 210 may have an outer diameter corresponding to the inner diameter of the shape memory alloy spring to be manufactured. The base wire 210 may be a string of synthetic resin material, but is not limited thereto, and various materials such as a wire material of a metal material may be used.

The base wire 210 unwound from the first unwinding portion 110 may be wound on the first winding portion 160. And the base wire 210 may be supplied at a constant speed.

The first rotation part 120 may be provided in the feeding direction of the base wire 210 to be unwound from the first unwinding part 110. A first through hole 121 may be formed through the first rotation part 120 in the center direction. The first through hole 121 may have an inner diameter larger than an outer diameter of the base wire 210. The first through hole 121 may have a diameter larger than an outer diameter of the base wire 210. [

The first rotation part 120 may be rotatably coupled to the first support part 170. The first support portion 170 may be provided in a feeding direction of the base wire 210 that is unwound from the first unwinding portion 110. A first connection hole 171 may be formed through the first support part 170 in a direction of supplying the base wire 210. The first rotation part 120 may be rotatably coupled to the first support part 170 and the first through hole 121 may have the same center axis as the first connection hole 171. [ The first rotation part 120 may be coupled to the first support part 170 and may rotate about the central axis of the first through hole 121.

The second unwinding portion 130 may be provided on the outer circumferential surface of the first rotation portion 120. [ The second unwinding unit 130 may be rotatable around a rotation axis 131 provided in a radial direction of the first rotation unit 120. Accordingly, the second unwinding portion 130 may be rotated together with the first rotating portion 120 when the first rotating portion 120 rotates, and the second unwinding portion 130 itself may be rotated. That is, the second unwinding unit 130 rotates about a first rotation centered on the central axis of the first rotation unit 120 and a second rotation about the rotation axis 131 provided in the radial direction of the first rotation unit 120 Can be performed at the same time.

In the second unwinding portion 130, the shape memory alloy wire 220 may be unwound. The shape memory alloy wire 220 that is unwound from the second unwinding portion 130 is wound around the base wire 120 after passing through the first through hole 121 of the first rotating portion 120 after being unwound by the first unwinding portion 110. [ (210). The shape memory alloy wire 220 may be a single wire. The shape memory alloy wire 220 may form the wire of the shape memory alloy spring, and the diameter of the wire of the shape memory alloy spring may be the diameter of the shape memory alloy wire 220.

The first fixing part 140 may bind the front end of the shape memory alloy wire 220 that is unwound by the second unwinding part 130 to the base wire 210 supplied through the first rotation part 120. [ The first fixing part 140 may be fixed while binding the shape memory alloy wire 220 to the base wire 210 and may be moved as the base wire 210 is supplied. The first fixing part 140 may have a clip shape or a clamp shape. The first fixing portion 140 is formed such that the front end portion of the shape memory alloy wire 220 is secured by the length 221 capable of forming the connecting portion 420 (see Fig. 8) of the shape memory alloy spring 400 Can be combined.

In the present specification, the front end and the rear end of the shape memory alloy wire 220 refer to the feeding direction of the shape memory alloy wire 220.

The base wire 210 is continuously supplied while the front end portion of the shape memory alloy wire 220 that is unwound by the second unwinding portion 130 is bound to the base wire 210 by the first fixing portion 140, As the rotation part 120 is rotated, the shape memory alloy wire 220 can be wound along the longitudinal direction of the base wire 210 on the outer circumferential surface of the base wire 210. As the supply of the base wire 210 is continued while the shape memory alloy wire 220 is wound on the base wire 210, the shape memory alloy wire 220 is rotated while the second unwinding portion 130 is rotated It will be able to be released continuously.

The apparatus for continuous production of the shape memory alloy springs may include a control unit 180. The control unit 180 may control the rotation speed of the first rotation unit 120. The control unit 180 can rotate the first rotation unit 120 at the first rotation speed and when the first rotation unit 120 is rotated at the first rotation speed, the shape memory alloy wire 220 is rotated to the base wire 210 And can be wound at the first pitch P1. The shape memory alloy wire 220 wound at the first pitch P1 may form the body portion 410 (see Fig. 8) of the shape memory alloy spring 400. [ The control unit 180 may rotate the first rotation unit 120 at a second rotation speed that is slower than the first rotation speed. The shape memory alloy wire 220 can be wound on the base wire 210 at a second pitch P2 larger than the first pitch P1 when the first rotation part 120 is rotated at the second rotation speed. The shape memory alloy wire 220 wound at the second pitch P 2 may form the connection portion 420 of the shape memory alloy spring 400.

The control unit 180 may control the first rotation unit 120 to rotate at the first rotation speed and the second rotation speed repeatedly. Accordingly, a plurality of unit spring shapes, that is, a plurality of shape memory alloy springs, can be continuously formed on the base wire 210.

The base wire 210 in a state in which the shape memory alloy wire 220 is wound can be wound around the first winding portion 160.

The control unit 180 adjusts the first rotation speed to adjust the first pitch P1 so that the number of turns of the body portion 410 of the shape memory alloy spring 400, ) Can be adjusted. The control unit 180 may adjust the rotation duration of the first rotation unit 120 rotated at the first rotation speed so that the length of the body 410 of the shape memory alloy spring 400 is adjusted .

The control unit 180 can adjust the second pitch P2 by adjusting the second rotation speed, thereby adjusting the number of turns of the connection unit 420 of the shape memory alloy spring 400. In this embodiment, it is preferable that the controller 180 adjusts the second rotation speed so that the second pitch P2 is formed to be large so that the connection part 420 can be formed in a linear shape. However, if the shape memory alloy wire 220 is not wound on the base wire 210 in the connecting portion 420, the shape memory alloy wire 220 may not be loosened in the second unwinding portion 130 Therefore, it is preferable that the minimum unwinding so that the shape memory alloy wire 220 is loosened in the second unwinding portion 130 is maintained. The control unit 180 can adjust the rotation duration time of the first rotation unit 120 rotated at the second rotation speed so that the length of the connection unit 420 of the shape memory alloy spring 400 can be adjusted.

The second fixing part 150 may bond the rear end of the shape memory alloy wire 220 that is unwound by the second unwinding part 130 to the base wire 210 supplied through the first rotation part 120. [ The second fixing part 150 may be the same as the first fixing part 140 and may be transferred together with the base wire 210. The second fixing portion 150 can be coupled such that the rear end of the shape memory alloy wire 220 is secured by a length 223 capable of forming the connecting portion 420 of the shape memory alloy spring 400 ).

The first fixing part 140 and the second fixing part 150 may be bound to the front end and the rear end of the shape memory alloy wire 220 wound around the base wire 210, The winding of the shape memory alloy wire 220 wound on the coil 230 can be prevented.

FIG. 7 is a flowchart showing a method for continuously manufacturing a shape memory alloy spring according to a first embodiment of the present invention, and FIG. 8 is an illustration showing an example of a shape memory alloy spring according to the first embodiment of the present invention.

7 and 8 together with FIGS. 3 to 6, a continuous manufacturing method of a shape memory alloy spring includes a first rotation part 120 having a first through hole 121 formed in an axial direction, And a step S310 in which the base wire 210 unwound from the first unwinding portion 110 is supplied through the first through hole 121. In this case,

In operation S310, the base wire 210 unwound from the first unwinding unit 110 may be supplied through the first rotation unit 120 and wound around the first winding unit 160.

In the continuous manufacturing method of the shape memory alloy spring, the shape memory alloy wire 220 wound on the second unwinding portion 130 provided in the first rotation portion 120 and rotating together with the first rotation portion 120 is loosened , And a step S320 of binding the front end of the shape memory alloy wire 220 to the base wire 210 through the first through hole 121 by the first fixing part 140.

In step S320, the shape memory alloy wire 220 can control the deformation temperature in a wide range, has a large amount of deformation, and has the advantage that the shape memory effect ability hardly changes even after a large number of repetitive operations are performed at the time of contraction. Ni alloy, Cu-Ti alloy.

Further, in the continuous manufacturing method of the shape memory alloy spring, the shape memory alloy wire 220 that is unwound by the second unwinding portion 130 is wound on the outer peripheral surface of the base wire 210 supplied through the first rotation portion 120, (S330) in which a unit spring shape of the unit spring is continuously formed.

In step S330, the unit spring may be the shape memory alloy spring 400. The shape memory alloy spring 400 may have a body portion 410 and a connecting portion 420. The body portion 410 may be a portion where deformation occurs in the shape memory alloy spring 400. The connection part 420 may be formed at both ends of the body part 410 and may be combined with a corresponding configuration of the artificial muscle device. The rotation speed and the rotation time of the first rotation part 120 can be adjusted by the controller 180 so that the pitch and length of the body part 410 and the connection part 420 can be adjusted.

The continuous manufacturing method of the shape memory alloy spring is such that the rear end of the shape memory alloy wire 220 to be unwound by the second unwinding portion 130 is prevented from being deformed by the second fixing portion 150 (S340) binding to the base wire 210 which is supplied through the first rotation part 120. [

In step S340, the second fixing part 150 may be formed at the time when the process of winding the shape memory alloy wire 220 on the base wire 210 is completed. When the rear end of the shape memory alloy wire 220 is bound to the base wire 210 by the second fixing part 150, the shape memory alloy wire 220 can be fixed so as not to be loosened at the base wire 210.

The method for continuously manufacturing the shape memory alloy spring includes a step of separating the base wire 210 wound around the shape memory alloy wire 220 wound around the first winding part 160 from the first winding part 160 S350).

The shape memory alloy wire 220, the first fixing part 140 and the second fixing part 150 may be coupled to the base wire 210 separated from the first winding part 160.

In the continuous manufacturing method of the shape memory alloy spring, a heat treatment step (S360) in which the base wire (210) in a state where the shape memory alloy wire (220) is wound is heated at a high temperature to be stored in a spring shape, (S370) to obtain a plurality of individual unit shape memory alloy springs including the body portion (410) and the connection portion (420).

In step S360, the base wire 210 in a state where the shape memory alloy wire 220 is wound can be heat-treated at a temperature of 300 to 400 DEG C for 30 to 60 minutes at a high temperature. As a result, when the shape memory alloy spring 400 is applied with a temperature of 300 to 400 ° C in the state where the shape memory alloy spring 400 is stretched, the shape memory alloy spring 400 can contract and return to the initial shape. When the heat treatment process is completed, the first fixing portion 140, the second fixing portion 150, and the base wire 210 can be removed.

In addition, the continuous manufacturing method of the shape memory alloy spring may further include a step (S365) of cutting the heat treated shape memory alloy wire and the base wire between S360 and S370. In step S365, cutting may be performed on the base wire 210 in which the shape memory alloy wire 220 is wound. That is, the base wire 210 and the shape memory alloy wire 220 can be cut while the shape memory alloy wire 220 is wound. The cutting may be performed at a central point of each connection portion 420.

FIGS. 9 and 10 are views showing an example of a wire manufacturing section of an apparatus for continuously manufacturing a shape memory alloy spring according to a second embodiment of the present invention. FIGS. 11 and 12 are views showing a shape memory alloy according to a second embodiment of the present invention Sectional view showing a shape memory alloy wire of a spring. In this embodiment, a wire manufacturing portion for manufacturing the shape memory alloy wire can be further included, and the other structure is the same as that of the above-described first embodiment, so the description is omitted.

9 to 11, the apparatus for continuously manufacturing the shape memory alloy springs may further include a wire manufacturing section 500. [

The wire manufacturing part 500 includes a third unwinding part 510, a second rotating part 520, a fourth unwinding part 530, a third fixing part 540, a fourth fixing part 550, And may have a second winding portion 560.

In the third unwinding part 510, the wound core wire 230 may be loosened. The core wire 230 may be a shape memory alloy. The core wire 230 unwound from the third unwinding part 510 may be wound on the second winding part 560. The core wire 230 may be a single wire.

The second rotating part 520 may be provided in the feeding direction of the core wire 230 that is unwound from the third unwinding part 510. A second through hole 521 may be formed through the second rotation part 520 in the center direction and a core wire 230 may be inserted through the second through hole 521. The second through hole 521 may have an inner diameter larger than the outer diameter of the core wire 230.

The second rotation part 520 may be rotatably coupled to the second support part 570. The second supporting portion 570 may be provided in the feeding direction of the core wire 230 that is unwound from the third unwinding portion 510. A second connection hole 571 may be formed through the second support portion 570 in the direction of supplying the core wire 230. The second rotation part 520 may be rotatably coupled to the second support part 570 and the second through hole 521 may have the same center axis as the second connection hole 571. [ The second rotation part 520 is coupled to the second support part 570 and can rotate about the central axis of the second through hole 521.

The fourth unwinding unit 530 may be provided on the outer circumferential surface of the second rotation unit 520. [ The fourth unwinding unit 530 may be rotatable around a rotation axis provided in a radial direction of the second rotation unit 520. The fourth unwinding unit 530 can simultaneously perform the third rotation about the center axis of the second rotation unit 520 and the fourth rotation about the rotation axis provided in the radial direction of the second rotation unit 520 .

In the fourth unwinding portion 530, the circumferential wire 240 may be loosened. The circumferential wire 240 unwound from the fourth unwinding portion 530 is wound around the core wire 230 supplied through the second through hole 521 of the second rotating portion 520 after being unwound by the third unwinding portion 510. [ As shown in Fig. The shape memory alloy wire 1220 in this embodiment may have a core wire 230 and a circumferential wire 240 wound around the outer circumferential surface of the core wire 230 through which the shape memory alloy spring has a stronger tensile force and A contracting force can be generated.

The third fixing unit 540 may fasten the front end of the circumferential wire 240 uncoiled in the fourth unwinding unit 530 to the core wire 230 supplied through the second rotation unit 520. [ The third fixing part 540 may be fixed while the circumferential wire 240 is bound to the core wire 230 and may be moved as the core wire 230 is supplied. The third fixing part 540 may have a clip shape or a clamp shape.

The core wire 230 is continuously supplied while the front end of the circumferential wire 240 which is released in the fourth unwinding portion 530 is bound to the core wire 230 by the third fixing portion 540 and the second rotation portion The circumferential wire 240 can be wound on the outer circumferential surface of the core wire 230 along the longitudinal direction of the core wire 230. As a result, As the core wire 230 continues to be fed while the circumferential wire 240 is wound on the core wire 230, the fourth wire winding part 530 is rotated so that the circumferential wire 240 can be continuously loosened . The core wire 230 in a state in which the circumferential wire 240 is wound can be wound around the second winding portion 560.

The fourth fixing unit 550 may fasten the rear end of the circumferential wire 240 that is loosened by the fourth unwinding unit 530 to the core wire 230 that is supplied through the second rotation unit 520. The fourth fixing part 550 may be the same as the third fixing part 540 and may be transferred together with the core wire 230. The third fixing part 540 and the fourth fixing part 550 may be respectively bound to the front end and the rear end of the circumferential wire 240 wound around the core wire 230, The winding of the winding wire 240 can be prevented.

In this embodiment, the circumferential wire 240 may be made of a shape memory alloy. That is, both the core wire 230 and the circumferential wire 240 may be formed of a shape memory alloy. The shape memory alloy spring thus formed can be shrunk more rapidly upon shrinkage due to heat after elongation due to external force, and can have strong shrinkage force.

Also, the circumferential wire 240 may be formed of a resistive material. When the circumferential wire 240 is formed of a resistive material, the circumferential wire 240 can be heated faster than the core wire 230 by an externally supplied current. The heat generated by the circumferential wire 240 is transmitted to the core wire 230 so that the core wire 230 can be rapidly heated, thereby speeding up the response speed of the core wire 230. The circumferential wire 240 may be made of at least one metal selected from the group consisting of nickel chrome, iron chrome, copper nickel, and constantan having a resistance higher than that of the core wire 230. The stiffness of the shape memory alloy spring can be increased because not only the effect described but also the circumferential wire 240 is wound on the core wire 230. [

12, when the circumferential wire 240 is formed of a resistive material, the shape memory alloy wire 2220 includes an insulating layer 250 between the core wire 230 and the circumferential wire 240 You can have more. The insulating layer 250 may electrically insulate the circumferential wire 240 and the core wire 230. The insulating layer 250 may prevent the current supplied to the circumferential wire 240 from flowing to the core wire 230 so that the heat generation efficiency of the circumferential wire 240 is not reduced.

The insulating layer 250 may be made of a material capable of withstanding the high temperature generated in the circumferential wire 240 and efficiently transmitting heat generated in the circumferential wire 240 to the core wire 230. For example, the insulating layer 250 may be made of glass fiber, Teflon or the like that can withstand temperatures of 600 ° C or higher. The core wire 230 may be supplied with the insulating layer 250 coated on the outer circumferential surface thereof.

A manufacturing process of the shape memory alloy wire 220 that is unwound in the second unwinding portion 130 through the wire manufacturing portion 500 will be described below.

The second rotating part 520 having the second through hole 521 formed in the axial direction is rotated and the core wire 230 unwound from the third unwinding part 510 is rotated by the second through hole 521, May be performed. The circumferential wire 240 wound around the fourth unwinding portion 530 provided in the second rotating portion 520 and rotating together with the second rotating portion 520 is loosened and the front end portion of the circumferential wire 240 is loosened And the step of binding the core wire 230 through the second through hole 521 by the fixing portion 540 may proceed. Thereafter, the winding of the circumferential wire 240 unrolled in the fourth unwinding portion 530 may be performed on the outer circumferential surface of the core wire 230 supplied through the second rotating portion 520. The rear end of the circumferential wire 240 to be loosened by the fourth unwinding portion 530 is supplied by the fourth fixing portion 550 through the second rotation portion 520 so as to prevent the circumferential wire 240 from being loosened The step of binding to the core wire 230 can proceed.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

110: first unwinding part
120: first rotating part
130: second unwinding part
140: first fixing unit
150: second fixing portion
160: First winding part
170: first support portion
180:
210: Base wire
220, 1220, 2220: Shape memory alloy wire
230: core wire
240: circumferential wire
250: insulating layer
400: shape memory alloy spring
410:
420:
500: wire manufacturing section

Claims (12)

A first unwinding portion in which the wound base wire is unwound;
A first rotating part having a first through hole through which the base wire is fed through the first unwinding part and is rotated about a central axis of the first through hole;
A plurality of unit spring shapes are continuously formed on the outer circumferential surface of the base wire, which is supplied through the first rotating portion, while the shape memory alloy wire wound on the first rotating portion is rotated together with the first rotating portion A second unwinding unit for allowing the first winding unit to rotate;
Wherein a front end portion and a rear end portion of the shape memory alloy wire to be unwound by the second unwinding portion are respectively bound to the base wire supplied through the first rotation portion, government; And
And a first winding portion around which the base wire wound around the shape memory alloy wire is wound. The method according to claim 1,
Further comprising a control unit for controlling the rotation speed of the first rotation unit such that the first rotation unit alternately rotates at a first rotation speed and a second rotation speed that is slower than the first rotation speed,
Wherein the shape memory alloy wire is wound on the base wire at a first pitch to form a body portion of the unit spring at the first rotation speed and at the second rotation speed, Wherein a connecting portion is formed at both ends of the body portion of the unit spring by winding the first and second unit springs at a second pitch larger than the first pitch. The method according to claim 1,
Wherein the second unwinding portion simultaneously performs a first rotation about a center axis of the first rotation portion and a second rotation about a rotation axis provided in a radial direction of the first rotation portion, Continuous manufacturing equipment. The method according to claim 1,
A third unwinding portion in which the wound core wire is unwound,
A second rotating part having a second through hole through which the core wire is fed through the pulley in the third unwinding part and rotating about the axial direction of the second through hole,
And a second rotation part provided in the second rotation part and rotated together with the second rotation part to wind the outer circumferential surface of the core wire supplied through the second rotation part while the circumferential wire wound around the second rotation part is wound to form the shape memory alloy wire, An unwinding portion,
The front end portion and the rear end portion of the circumferential wire that is unwound in the fourth unwinding portion are respectively bound to the core wire that is supplied through the second rotation portion and the third and fourth fixing portions, Further comprising a wire manufacturing section,
Wherein the core wire wound around the circumferential wire is wound on the second winding portion. a) a first rotating part having a first through hole formed to pass through in the axial direction is rotated, and a base wire to be loosened in the first unwinding part is supplied through the first through hole;
b) a shape memory alloy wire wound around a second unwinding portion provided in the first rotation portion and rotating together with the first rotation portion is loosened, and a front end portion of the shape memory alloy wire is connected to the first through- Bonding to the base wire supplied through the ball;
c) a shape memory alloy wire that is unwound in the second unwinding portion is wound on an outer circumferential surface of the base wire supplied through the first rotating portion to form a plurality of unit spring shapes continuously;
d) a rear end of the shape memory alloy wire that is unwound in the second unwinding portion is coupled to the base wire supplied through the first rotation portion by the second fixing portion so that the shape release of the plurality of unit springs is prevented step; And
and e) the base wire wound with the shape memory alloy wire wound around the first winding part is separated from the first winding part. 6. The method of claim 5,
A heat treatment step in which after the step (e), the base wire wound with the shape memory alloy wire is heat-treated so as to be heated at a high temperature and stored in a spring shape; and a plurality of base wires Further comprising a spring obtaining step of obtaining a shape memory alloy spring of an individual unit. The method according to claim 6,
Further comprising the step of cutting the heat treated shape memory alloy wire and the base wire between the heat treatment step and the spring obtaining step, wherein the cutting is performed at a central point of each of the connecting portions Continuous manufacturing method of memory alloy springs. 6. The method of claim 5,
The shape memory alloy wire that is unwound from the second unwinding portion
A second rotating part having a second through hole penetratingly formed in the axial direction is rotated; a core wire which is unwound in a third unwinding part is supplied through the second through hole;
A circumferential wire wound around a fourth unwinding portion provided in the second rotating portion and rotating together with the second rotating portion is loosened and a front end portion of the circumferential wire is fed through the second through hole by a third fixing portion Bonding to the core wire,
Winding the circumferential wire wound on the outer circumferential surface of the core wire supplied through the second rotating part;
And the rear end of the circumferential wire to be loosened in the fourth unwinding portion is bonded to the core wire supplied through the second rotating portion by the fourth fixing portion so as to prevent the circumferential wire from loosening. Wherein the shape memory alloy springs are continuously formed. A shape memory alloy spring produced by the continuous manufacturing method of the shape memory alloy spring according to any one of claims 5 to 8. 10. The method of claim 9,
Wherein the shape memory alloy wire has a core wire and a circumferential wire wound around the core wire, and the core wire and the circumferential wire are shape memory alloys. 10. The method of claim 9,
Wherein the shape memory alloy wire has a core wire and a circumferential wire wound around the core wire, the core wire is a shape memory alloy, and the circumferential wire is formed of a resistance material for supplying heat to the core wire Shape memory alloy spring. 12. The method of claim 11,
Wherein an insulating layer is further provided between the core wire and the circumferential wire to electrically insulate the circumferential wire from the core wire.

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