JP2013256974A - Metallic wire joining structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic wire joining structure which improves fatigue durability between a wire and a member to be caught which is fixed to the wire.SOLUTION: A metallic wire joining structure includes a wire 1 and a first cylindrical member 3' and a second cylindrical member 4' inserted by the wire while being adjacent to each other with respect to the wire 1, when the hardness of the wire 1 is HO, the hardness of the first cylindrical member 3' is H1 and the hardness of a second cylindrical member 4' is H2, the relation of H1<HO≤H2 holds and the first cylindrical member 3' is arranged on the side of receiving a repeated load from the wire 1. Further, both cylindrical members 3', 4' are plastically deformed by a caulking die 11 to form a first member 3 to be caught and a second member 4 to be caught. Then, the first cylindrical member 3' is subjected to caulking joining in a soft state and the second member 4 to be caught is subjected to caulking joining in a hard state.

Description

  The present invention relates to a metal wire bonding structure in which a hook member is fixed to a wire by plastic deformation.

  2. Description of the Related Art Conventionally, as a technique for fixing a hook member to a wire, a technique is known in which a wire is inserted into a hook member, and the hook member is plastically deformed inward from the outer peripheral surface side to be crimped and fixed to the wire. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-157661) employs a soft member whose hardness of a hooking member (stopping member) is lower than the hardness of the wire so as not to reduce the diameter of the wire. A technique is disclosed in which a member is plastically deformed inward from the outer peripheral surface side and fixed by pressure bonding.

  According to the technique disclosed in this document, since the hook member can be fixed without reducing the diameter of the wire, the strength of the wire does not decrease, and the resistance when a low load is repeatedly applied (hereinafter, referred to as the wire strength) , Referred to as “fatigue limit number”).

JP 2001-157661 A

  In the technique disclosed in the above-mentioned document, since a soft member is used as the hook member, the strength of the hook member itself is low, and when a repeated load is applied, the portion acting as the hook is damaged. There is an inconvenience that the catching member is easily opened and the compressive force to the wire is easily lowered.

  In order to stabilize high strength for a long time with a soft hooking member, the length of the hooking member should be increased to some extent and the wall thickness should be increased, but the shape becomes large and limited. There is a problem that it becomes difficult to use the space and the versatility is lowered.

  In view of the above circumstances, an object of the present invention is to provide a metal wire bonding structure that can obtain high versatility even in a limited space, with high strength and resistance to repeated loads. .

  The present invention provides a metal wire bonding structure for fixing a hook member to a metal wire, the metal first hook member having a through hole, and another through hole, wherein the first hook member A second hook member made of metal of a different material, and the wires inserted into the respective through holes of the first and second hook members, and the first and second hook members Are plastically deformed from the outer peripheral surface side to the inner side in a state of being adjacent to each other, and are fixed to the wire.

  According to the present invention, after a metal wire is inserted into the through holes of the first and second hook members made of different materials, the outer periphery of the hook member is joined to each other. Since the first hooking member and the second hooking member are plastically deformed and fixed to the metal wire because they are plastically deformed from the surface side to the inside and fixed to the metal wire, the through hole The metal wire, the first hooking member, and the second hooking member are different in deformation between the first hooking member and the second hooking member and are deformed according to the material. The resistance of the load direction between the members is different, for example, one of the hook members has a high resistance to repeated loads, and the other of the hook members has a high resistance to tensile loads. Realize a joint structure that is resistant to repeated loads in a limited space. Can be can be, achieve high versatility.

The side view of the state which fixed the hook member by 1st Embodiment to metal wires The cross-sectional side view of the state which inserted the cylindrical member which is a base material of a hook member into the metal wire same as the above Same as above, taken along the line III-III in FIG. FIG. 2 is a cross-sectional side view corresponding to FIG. 2 of a cylindrical member according to another embodiment. FIG. 2 is a sectional side view corresponding to FIG. 2 of a cylindrical member according to another embodiment. FIG. 2 is a cross-sectional side view corresponding to FIG. 2 of a cylindrical member according to another embodiment. The cross-sectional side view of the state in which the cylindrical member is plastically deformed with a caulking die Same as above, a cross-sectional front view of a state in which a cylindrical member is plastically deformed with a caulking die (A) is IX-IX sectional view of FIG. 7, (b) is IX'-IX 'sectional view of FIG. Front view of caulking dies according to another embodiment 10A is a cross-sectional view corresponding to FIG. 9A in a state where the first hooking member is formed by the caulking die of FIG. 10, and FIG. 10B is a cross-sectional view of the first hooking member formed by the caulking die of FIG. Sectional view corresponding to FIG. 9B in the state Front view of caulking dies according to another embodiment 9A is a cross-sectional view corresponding to FIG. 9A in a state in which the first hooking member is formed by the caulking die of FIG. 12, and FIG. 12B is a cross-sectional view of the first hooking member formed by the caulking die of FIG. Sectional view corresponding to FIG. 9B in the state The front view of the caulking die according to another embodiment 14A is a cross-sectional view corresponding to FIG. 9A in a state where the first hooking member is formed by the caulking die of FIG. 14, and FIG. 14B is a cross-sectional view of the first hooking member formed by the caulking die of FIG. Sectional view corresponding to FIG. 9B in the state Cross-sectional side view of cylindrical member according to second embodiment Same as above, cross-sectional side view of a state in which a cylindrical member is plastically deformed Sectional side view of the state in which the cylindrical member by 3rd Embodiment was inserted in the wire Same as above, cross-sectional side view of a state in which a cylindrical member is plastically deformed The schematic block diagram of the endoscope which shows 4th Embodiment and applies the junction structure which fixed the hook member to the wire

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
1 to 15 show a first embodiment of the present invention. As shown in FIG. 1, the first hook member 3 and the second hook member 4 are fixed to the end portion of the metal wire 1 so as to be adjacent to each other without a gap. The wire 1 is formed of a single wire, a stranded wire, or a knitted wire. Each of the catching members 3 and 4 is formed by plastically deforming the first and second cylindrical members 3 ′ and 4 ′, which are base materials, with an external pressure. As shown in FIG. 3, both cylindrical members 3 ′ and 4 ′ have the same outer cross section, and a through-hole through which the wire 1 is inserted into the axial core of each cylindrical member 3 ′ and 4 ′. 3a and 4a are perforated.

  The hardness of the wire 1 and the cylindrical members 3 ′ and 4 ′ is as follows: the material hardness of the wire 1 is H0, the hardness of the first cylindrical member 3 ′ is H1, and the hardness of the second cylindrical member 4 ′. If H2 is H2, the relationship of H1 <H0 ≦ H2 is set. In this embodiment, this hardness relationship is set by the material of each member. That is, when the material of the metal wire 1 is made of stainless steel or a rigid material, the metal material of the first cylindrical member 3 ′ is made of an aluminum alloy or copper alloy having a lower hardness, and the second cylinder. The metal material of the shaped member 4 ′ is any one of stainless steel, steel material, titanium, and titanium alloy.

  Further, as shown in FIG. 2, the lengths L1 and L2 of the first and second cylindrical members 3 'and 4' are set to 1 mm in this embodiment. However, this length L1. L2 is adjusted to an optimum value according to the required number of fatigue limits with respect to the wire 1 and the tensile strength.

  The first and second cylindrical members 3 ′ and 4 ′ may have a simple cylindrical shape as shown in FIG. 2, but as described later, both cylindrical members 3 ′ and 4 ′. Since 4 ′ is simultaneously plastically deformed in a state of being adjacent to each other without a gap, it is possible to improve the processing accuracy by inserting the wire 1 in a state of being centered with each other.

  Various modes can be considered for positioning the cylindrical members 3 'and 4' in a centered state. Hereinafter, modes other than the embodiment shown in FIG. 2 described above are illustrated in FIGS.

  In the embodiment shown in FIG. 4, a convex portion 3b is formed coaxially with the through-hole 3a on the surface of the first cylindrical member 3 ′ that contacts the second cylindrical member 4 ′, and the second cylindrical member is opposed thereto. On the surface of 4 ′, a concave portion 4b that fits into the convex portion 3b is formed coaxially with the through hole 4a. By fitting the convex portion 3b of the first cylindrical member 3 ′ into the concave portion 4b of the second cylindrical member 4 ′, the both through holes 3a and 4b are positioned coaxially, and thus both the through holes 3a and 4a. Positioning is easy.

  In the embodiment shown in FIG. 5, the surface of the first cylindrical member 3 ′ that contacts the second cylindrical member 4 ′ is a tapered convex portion 3 c, and the second cylindrical member 4 ′ that faces the tapered convex portion 3 c is used. In this surface, a tapered concave portion 4c that fits into the tapered convex portion 3c is formed. Since the first cylindrical member 3 ′ and the second cylindrical member 4 ′ are joined along the tapered convex portion 3 c and the tapered concave portion 4 c, the mounting becomes easy. In this state, if both cylindrical members 3 ′ and 4 ′ are plastically deformed at the same time, the thickness of the joint between the tapered convex portion 3c and the tapered concave portion 4c is relatively changed. The upper hardness can be changed continuously as it shifts from the first cylindrical member 3 ′ to the second cylindrical member 4 ′.

  Moreover, the aspect shown in FIG. 6 forms the external thread part 3d coaxially with the through-hole 3a of the surface which contacts 2nd cylindrical member 4 'of 1st cylindrical member 3', and the 2nd cylinder which opposes this. A female screw portion 4d that is screwed into the male screw portion 3d is formed coaxially with the through hole 4a on the surface of the member 4 ′. By screwing the male screw portion 3d of the first cylindrical member 3 'and the female screw portion 4d of the second cylindrical member 4', both the cylindrical members 3 'and 4' are fastened in a centered state. Therefore, higher processing accuracy can be obtained. As shown in the figure, since the apparent hardness of the portion where the male screw portion 3d and the female screw portion 4d are screwed is changed, in this embodiment, the first cylindrical member 3 ′ and the second cylindrical member 3 When the entire length when the cylindrical member 4 ′ is coupled is divided into three equal parts and the length of the main body portion of the first cylindrical member 3 ′ is La, the screw of the male screw portion 3d and the female screw portion 4d is threaded. The length of the combined portion is set to La, and the length of the second cylindrical member 4 ′ is set to 2La.

  In addition to the above, a mode in which both cylindrical members 3 'and 4' are positioned in a centered state is conceivable. In other words, the shape is not limited to the above-described embodiment as long as the shape can be plastically deformed. In the following description, the first and second cylindrical members 3 ′ and 4 ′ shown in FIG. 4 will be used for convenience.

  The first and second cylindrical members 3 ′ and 4 ′ described above are plastically deformed by the caulking die 11. As shown in FIGS. 7 and 8, the caulking die 11 has an upper die 15 and a lower die 16 which are a pair of die dies, and molding surfaces 15a and 16a of both die 15 and 15 are used. The first and second cylindrical members 3 ′ and 4 ′ that are adjacent to each other are pressed, and the cylindrical members 3 ′ and 4 ′ are plastically deformed inward from the outer peripheral surface side. Since the molding surfaces 15a and 16a of the upper and lower dies 15 and 16 shown in FIG. 8 are flat, when both cylindrical members 3 ′ and 4 ′ are pressed by the molding surfaces 15a and 16a, as shown in FIG. Cylindrical members 3 ′ and 4 ′ are crushed in a substantially flat shape, and are caulked and fixed to the wire 1 inserted through the through holes 3a and 4a.

  Next, a procedure for fixing the first and second hook members 3 and 4 to the metal wire 1 will be described. First, as shown in FIGS. 2 and 3, the first cylindrical member 3 ′ and the second cylindrical member 4 ′, which are base materials of the first hook member 3 and the second hook member 4, are drilled. The wire 1 is inserted into the through holes 3a and 4a.

  Next, the first cylindrical member 3 ′ and the second cylinder in which the wire 1 is inserted between the molding surfaces 15 a and 16 a formed on the opposing surfaces of the upper die 15 and the lower die 16 of the caulking die 11. The face-shaped member 4 'is faced in an adjacent state. At this time, the side that receives the repeated load F0 (see FIG. 7) from the wire 1 is arranged to be the first cylindrical member 3 '.

  Thereafter, a compressive force P (see FIG. 8) is applied to the outer peripheral surfaces of the cylindrical members 3 'and 4' adjacent to each other on the molding surfaces 15a and 16a of the upper and lower dies 15 and 16 without any gap. Then, both the cylindrical members 3 ′ and 4 ′ are plastically deformed into a flat shape, and the first hook member 3 and the second hook member 4 are formed. Further, in the process of forming both the hook members 3 and 4, each insertion hole 3a and 4a is reduced in diameter, and is applied with crimping force by applying a compressive force to the wire 1, as shown in FIG. Each cylindrical member 3 ′, 4 ′ is fixed to the wire 1.

  By the way, the hardness H1 of the first cylindrical member 3 ′ is set lower than the hardness H0 of the wire 1 (H1 <H0), and is the hardness H2 of the second cylindrical member 4 ′ the same as the hardness H0 of the wire 1? , Higher than that (H0 ≦ H2). Therefore, even when the upper and lower dies 15 and 16 apply the same compressive force P to the cylindrical members 3 ′ and 4, the hardness difference between the wire 1 and the cylindrical members 3 ′ and 4 ′. Thus, the manner of joining (caulking) of the through holes 3a, 4a to the wire 1 is different.

  That is, in the first hook member 3 formed by plastic deformation of the first cylindrical member 3 ′ softer than the wire 1, the through hole 3 a is caulked with respect to the wire 1. As a result, the resistance (fatigue resistance) to the repeated load F0 (see FIG. 7) acting on the wire 1 is increased. On the other hand, the second hooking member 4 formed by plastic deformation of the second cylindrical member 4 ′ is caulked with the through hole 4 a being hard with respect to the wire 1. As a result, the resistance (tensile resistance) to the tensile load F1 (see FIG. 7) acting in the axial direction of the wire 1 is increased.

  The caulking in the soft state described above is, as shown in FIG. 9A, the first cylindrical member 3 ′ is softer than the wire 1, so that the through hole 3 a tends to be deformed in the axial direction. In this caulking joining, it is assumed that the through hole 3a is deformed in a state of substantially following the outer peripheral surface without greatly deforming the circular cross section of the wire 1.

  On the other hand, the caulking in the hard state described above is because the hardness of the second cylindrical member 4 ′ is the same as or harder than that of the wire 1 as shown in FIG. This is caulking joining in which a tendency to deform in the pressurizing direction of the compressive force P appears strongly. In this caulking joining, it is estimated that the through hole 4a is deformed so as to crush the wire 1 into a substantially flat shape.

  Thus, in this embodiment, the hook member that is caulked and joined to the wire 1 is the same as the hardness of the first hook member 3 that is softer than the wire 1 and the wire 1 or harder than that. Since the first hook member 3 is composed of the two hook members 4 and is plastically deformed in a state of being adjacent to each other without a gap, the first hook member 3 which is caulked and joined in the soft state can obtain high fatigue resistance, and the second hook member 4 can obtain a high tensile resistance. Further, since the first hooking member 3 is arranged on the side that receives the repeated load from the wire 1, the number of fatigue limits between the wire 1 and the first hooking member 3, and the wire 1 and the second hooking member 4. The tensile strength between the two can be set high.

  As a result, even in a limited space, it is possible to obtain a joint structure having high strength and strong against repeated loads, and high versatility can be obtained.

  By the way, the above-described caulking die 11 plastically deforms the first cylindrical member 3 ′ and the second cylindrical member 4 ′ with the flat molding surfaces 15a and 16a, but the caulking die employed in the present embodiment is the same. It is not limited.

  For example, a caulking die 21 as shown in FIGS. 10 and 11 may be used. The molding surfaces 25a and 26a of the upper and lower dies 25 and 26 constituting the caulking die 21 are formed in V-shaped grooves, and the first cylindrical member 3 ′ as shown in FIG. 2 is formed by the molding surfaces 25a and 26a. When the second cylindrical member 4 ′ is pressed and plastically deformed, a first hooking member 23 and a second hooking member 24 having a substantially rhombic cross section are formed as shown in FIG.

  Since the hardness of the first hook member 23 is softer than that of the wire 1, the through hole 23 a is caulked and joined to the wire 1 in a soft state as shown in FIG. On the other hand, since the hardness of the second hooking member 24 is the same as or harder than that of the wire 1, it is caulked and joined in a hard state as shown in FIG. In addition, since the effect of the caulking joining in the soft state and the caulking joining in the hard state has already been described, the description thereof is omitted here.

  On the other hand, the caulking die 31 shown in FIGS. 12 and 13 has molding surfaces 35a and 36a that are hexagonal by joining the upper and lower dies 35 and 36 together. Accordingly, when the first cylindrical member 3 ′ and the second cylindrical member 4 ′ are pressed and plastically deformed by the molding surfaces 35a and 36a, as shown in FIG. 13, the first hooking member having a hexagonal cross section is obtained. 33 and the second hooking member 34 are formed.

  Since the hardness of the first hook member 33 is softer than that of the wire 1, the through hole 33 a is caulked and joined to the wire 1 in a soft state as shown in FIG. On the other hand, since the hardness of the second hooking member 34 is the same as or harder than that of the wire 1, it is caulked and joined in a hard state as shown in FIG. In addition, since the effect of the caulking joining in the soft state and the caulking joining in the hard state has already been described, the description thereof is omitted here.

  The caulking die 41 shown in FIGS. 14 and 15 has molding surfaces 45a and 46a that are elliptical by joining the upper and lower dies 45 and 46 together. Therefore, when the first cylindrical member 3 ′ and the second cylindrical member 4 ′ are pressed and plastically deformed by the molding surfaces 45a and 46a, as shown in FIG. 15, the first hooking member having an elliptical cross section is obtained. 43 and the second hooking member 44 are formed.

  Since the hardness of the first hook member 43 is softer than that of the wire 1, the through hole 43 a is caulked and joined to the wire 1 in a soft state as shown in FIG. On the other hand, since the hardness of the second hooking member 44 is the same as or harder than that of the wire 1, it is caulked and joined in a hard state as shown in FIG. Further, since the effects of the caulking joining in the soft state and the caulking joining in the hard state have already been described, the description thereof is omitted here.

  The above-described caulking dies 11, 21, 31, 41 are examples, and compressive force is applied so that the first cylindrical member 3 ′ and the second cylindrical member 4 ′ are plastically deformed inward from the outer peripheral surface side. The shape of the molding surface is not particularly limited as long as P can be added.

[Second Embodiment]
16 and 17 show a second embodiment of the present invention. This embodiment is a modification of the first embodiment described above. In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and description is simplified.

  In the first embodiment described above, it is effective when the repetitive load F0 and the tensile load F1 are input from one direction with respect to the axial direction of the wire 1, but when input from both directions, the fatigue resistance is effective. The repetitive load F0 is input from the low second hooking member 4 side. In the present embodiment, even when the repeated load F0 is input to the wire 1 from both directions, high fatigue resistance can be ensured.

  The base materials of the first and second hook members 53 and 54 employed in the present embodiment are a second cylindrical member 4 ′ disposed in the center with respect to the wire 1, and both sides of the second cylindrical member 4 ′. And two first cylindrical members 3 ′ arranged adjacent to each other. The material and shape of the wire 1 and the cylindrical members 3 'and 4' are the same as those in the first embodiment. Furthermore, the shape of the molding surface of the caulking die that plastically deforms each cylindrical member 3 ′, 4 ′ is the same as that of the caulking die 11 (21, 31, 41) of the first embodiment described above. The shape of the first hook member 53 and the second hook member 54 formed by plastic deformation by the caulking dies 11 (21, 31, 41) is the same as that of the first hook member 3 (23 of the first embodiment described above. , 33, 43) and the second hooking member 4 (24, 34, 44).

  When the hook members 53, 54, 53 are fixed to the wire 1, as shown in FIG. 17, the second cylindrical member 4 ′, which is the base material of the second hook member 54, is centrally located with respect to the wire 1. So that the first cylindrical member 3 ′, which is the base material of the first hooking member 53, is inserted on both sides of the first cylindrical member 3 ′, and the second cylindrical member 4 ′ is sandwiched between the first cylindrical members 3 ′. Place them next to each other.

  And each cylindrical member 3 ', 4', 3 'is plastically deformed with respect to the wire 1 by applying the compressive force P inside from the outer peripheral surface side using the caulking dies 11 (21, 31, 41). First, second, and first hook members 53, 54, and 53 are formed. Then, the first hook member 53 is caulked and fixed to the wire 1 in a soft state, and the second hook member 54 is caulked and fixed to the wire 1 in a hard state. Accordingly, the first hooking member 53 has high fatigue resistance, and the second hooking member 54 sandwiched between the first hooking members 53 has high tensile resistance.

  As a result, according to the present embodiment, in addition to the effects of the first embodiment described above, high fatigue resistance can be obtained even if a repeated load F0 is applied in both directions in the axial direction of the wire 1.

[Third Embodiment]
18 and 19 show a third embodiment of the present invention. The first hooking member 57 and the second hooking member 58 shown in the present embodiment are the entire circumference of the joint surface 59 between the first cylindrical member 57 ′ and the second cylindrical member 58 ′ as the base material, or A plurality of locations are integrated by welding (for example, laser welding) or using an adhesive. The materials of the first cylindrical member 57 ′ and the second cylindrical member 58 ′ are the same as those of the first cylindrical member 3 ′ and the second cylindrical member 4 ′ of the first embodiment described above.

  In the present embodiment, since the first cylindrical member 57 ′ and the second cylindrical member 58 ′ are fixed in advance, they are inserted into the wire 1 and plastically deformed using the caulking dies 11 (21, 31, 41). In doing so, both cylindrical members 57 ′ and 58 ′ need not be joined using a jig or the like, and workability is good.

  Further, the first hook member 57 and the second hook member 58 formed by plastically deforming both the cylindrical members 57 ′ and 58 ′ have the joint surfaces 59 fixed thereto, so that a gap is hardly generated. The strength becomes high and high fatigue resistance can be obtained more stably.

  The present embodiment can also be applied to a structure in which the first cylindrical member 57 'is disposed on both sides of the second cylindrical member 58' as in the second embodiment described above. In this case, the first cylindrical members 57 'are fixed to both surfaces of the second cylindrical member 58' by welding or using an adhesive.

[Fourth Embodiment]
FIG. 20 shows a fourth embodiment of the present invention. In the present embodiment, the endoscope 100 is provided with the first hook member 3 (23, 33, 43, 53, 57) and the second hook member 4 (24, 34) shown in the first to third embodiments described above. , 44, 54, 58). FIG. 20 shows the entire configuration of the endoscope 100 with the insertion portion flexible tube 102 removed from the operation portion 101. In the figure, for ease of explanation, the first and second hook members 3 and 4 of the first embodiment are displayed as representatives.

  The endoscope 100 includes an operation unit 101 that is held and operated by an operator with a hand, and an insertion unit flexible tube 102 is connected to the operation unit 101. Then, by operating the bending operation knob 103 provided in the operation unit 101, the bending unit 104 provided at the distal end of the insertion portion flexible tube 102 is bent.

  A chain 105 and a wire 106 are used as means for transmitting force from the bending operation knob 103 to the bending portion 104. The chain 105 is connected to the bending operation knob 103, and the wire 106 is connected to the bending portion. As a part of the connecting member between the chain 105 and the wire 106, the first hooking member 3 (23, 33, 43, 53, 57) and the second hooking member 4 (24, 34, 44, 54, 58) Is used.

  That is, the chain 105 and the wire 106 are connected to the rear end of the wire 106 by caulking and joined to the first hook member 3 (23, 33, 43, 53, 57) and the second hook member 4 (24, 34, 44, 54, and 58) are attached to and continuously provided on a receiving portion 105 a formed at the tip of the chain 105. In this case, a repetitive load from the insertion portion flexible tube 102 side via the wire 106 causes the first hook member 3 (23, 33, 43, 53, 57) and the second hook member 4 (24, 34, 44). , 54, 58), the first hook member 3 (23, 33, 43, 53, 57) is arranged on the insertion portion flexible tube 102 side.

  The first hook member 3 (23, 33, 43, 53, 57) and the second hook member 4 (24, 34, 44, 54, 58) shown in the first to third embodiments described above are internally viewed. By caulking and bonding to the wire 106 of the mirror 100, the bonding quality can be stabilized in addition to the effects of the first to third embodiments. Moreover, since it is a simple joining technique, the product function of the endoscope 100 can be stabilized and the manufacturing cost can be reduced.

  The present invention is not limited to the above-described embodiment. For example, in each of the above-described embodiments, the first catching member 3 (23, 33, 43) using the caulking die 11 (21, 31, 41) is used. , 53, 57) and the second hooking member 4 (24, 34, 44, 54, 58) are formed, but they may be caulked and joined by swaging.

1 ... Wire,
3, 23, 33, 43, 53, 57 ... 1st hook member,
3 ', 57' ... 1st cylindrical member,
3a, 4a, 33a, 43a ... through holes,
4, 24, 34, 44, 54, 58 ... second hook member,
4 ', 58' ... 2nd cylindrical member,
11, 21, 31, 43 ... caulking dies,
15, 25, 35, 45 ... upper die,
15a, 16a, 25a, 26a, 35a, 36a, 45a, 46a ... molding surface,
16, 26, 36, 46 ... lower die,
F0: Repeat load,
F1 ... tensile load,
H0: Hardness,
H1 ... Hardness,
H2 ... Hardness,
P: Compression force

Claims (4)

In the metal wire bonding structure for fixing the hook member to the metal wire,
A metal first hook member having a through hole;
A second hook member made of metal having a different through hole and made of a different material from the first hook member;
The wires inserted into the through holes of the first and second hooking members,
The metal wire joining structure, wherein the first and second hooking members are plastically deformed inward from the outer peripheral surface side and fixed to the wire in a state of being adjacent to each other.   The metal wire bonding structure according to claim 1, wherein the first hook member and the second hook member are inserted into the wire in a fixed state.   When the hardness of the material of the wire is H0, the hardness of the first hooking member is H1, and the hardness of the second hooking member is H2, the relationship is H1 <H0 ≦ H2. The metal wire bonding structure according to claim 1 or 2.   The metal wire bonding structure according to any one of claims 1 to 3, wherein the second hooking member is disposed between the two first hooking members.

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