JPH11156079A - Needle for sewing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a needle from being plurally separated even when large force is applied to the needle at the time of sewing and the needle is broken in an unlikely event. SOLUTION: A hand sewing needle 1 is made of a main structure material 2 of a hard steel wire material and a core material 3 of a superelastic Ni-Ti alloy wire. Even when the main structure material 2 is broken at a part B, since the core material 3 of the superelastic Ni-Ti alloy wire is present, the hand sewing needle 1 is not separated. Also, when force indicated by an arrow is unloaded, the elongation and distortion of the core material 3 of the superelastic Ni-Ti alloy wire are removed, the needle 1 is in a state almost before being bent and this broken needle is easily pulled out of cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sewing needles such as hand sewing needles and sewing needles, and more particularly to sewing needles such as hand sewing needles and sewing needles which are hardly separated into a plurality of pieces when broken.

[0002]

2. Description of the Related Art Conventionally, as a sewing needle such as a hand sewing needle and a sewing needle, a steel wire, particularly a hard steel wire, has been widely used. A straightened steel wire is cut into a predetermined length, and a predetermined length is cut with a die. It is manufactured by forming into the shape and thickness of the shape and then attaching a needle point that sharpens the tip.
A needle having no defects such as flaws, having a smooth and glossy, measuring the degree of warpage, performing a bending fracture test, and having predetermined characteristics is used.

[0003]

As described above, the sewing needle measures the degree of warpage and performs a bending fracture test.
Those having predetermined characteristics are used. However, even with a needle whose warpage is measured and a bending fracture test is performed, an unexpectedly large force is applied at the time of sewing, the needle may be broken and broken, and may be separated into a plurality. Further, if the needle is broken and broken or separated, it is necessary to completely recover the needle that has been broken and separated due to safety problems, and there is a problem that it takes a considerable amount of time to search, collect and inspect the needle. An object of the present invention is to provide a sewing needle which is not separated into a plurality of needles even if a large force is applied to the needle during sewing and the needle may be broken.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a sewing needle made of a steel wire, comprising a composite material in which a superelastic alloy wire or a shape memory alloy wire is provided as a core on a steel wire of a main structural material. It is a unique needle for sewing. Further, the present invention provides a sewing needle core material comprising a Ni—Ti alloy, a Ni—Ti alloy, and a Cr, V, Co, Fe, Cu, A
One or more of l and Zr are added in a total amount of 0.1
Ternary or quaternary alloy containing ~ 2.0 at%, Cu-
The wire is any one of a Zn-Al alloy and a Cu-Al-Ni alloy. Further, in the present invention, the shape memory alloy wire of the needle core material for sewing is made of Cr, V, Co, Fe, Cu, A in Ni-Ti alloy or Ni-Ti alloy.
One or more of l and Zr are added in a total amount of 0.1
Ternary or quaternary alloy containing ~ 2.0 at%, Cu-
The wire is any one of a Zn-Al alloy and a Cu-Al-Ni alloy. Here, in the present invention, the steel wire of the sewing needle main structure material is a hard steel wire, Cr,
1.0 wt% C to which V, Mo carbide forming elements are added
Degree of hyper-coprecipitated steel wire or Cu with added Cu:
The steel is characterized by being 0.60 to 1.05 wt% steel.

[0005]

The sewing needle of the present invention is made of a composite material in which a superelastic alloy wire or a shape memory alloy wire is provided as a core on a steel wire as a main structural material, so that a large force is applied during sewing and the needle is broken by any chance. In some cases, the sewing needle does not separate into a plurality. In addition, the metal with superelastic properties of the core material has a zero elongation strain if the external stress is unloaded even if it is pulled far beyond the limit of ordinary elastic elongation, and the sewing is bent and bent. The needle is easy to remove from the fabric because the needle is about to return. Further, even if the sewing needle is deformed such as bending, the shape memory alloy of the core material returns to its original shape when it is heated to the point _Af or higher, and is easily removable from the fabric.

Since the main structural material (needle body) of the sewing needle is made of a steel wire, for example, a hard steel wire, the sewing needle has no defects such as flaws on its surface, which is an essential function of the sewing needle, and is smooth.
It is shiny and has appropriate elasticity. In addition, Cr, V, and the like as main structural materials (needle body) of the sewing needle are used.
In a wire rod of about 1.0 wt% C hypercoprecipitated steel to which Mo carbide forming element is added, or C to which Cu is added:
A steel having a high degree of tensile strength, heat resistance, and abrasion resistance using 0.60 to 1.05 wt% steel is used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, examples of sewing needles include hand needles such as ordinary needles, Japanese-style sewing needles, dress-making needles, special needles, French embroidery needles, thread stop needles, sewing machines needles, and folding needles. Can be The main structural material of the sewing needle of the present invention includes a hard steel wire,
Specifically, C: 0.27 to 0.82 wt%, Si:
0.15 to 0.35 wt%, Mn: 0.30 to 0.90
wt%, P: ≦ 0.030 wt%, S: ≦ 0.030w
A hard steel wire having t% and the balance Fe is used. Mild steel wire can also be used. In addition, a wire rod of about 1.0 wt% C hypercoprecipitated steel to which Cr, V, and Mo carbide forming elements are added, for example, Cr: 0.95 wt% or less, V: 0.20 w
t or less, Mo: 0.20 wt% or less, about 1.0 wt% C steel added with one or two kinds is used.
C: 0.60 to 1.05 wt% steel to which Cu is added is used.

In particular, when the main structural material is a sewing needle that requires a high degree of tensile strength, heat resistance and abrasion resistance, Cr, V , M
o steel added with carbide forming element o, or C: 0.6
It is preferable to use a steel of 0 to 1.05 wt% to which Cu is added.

In the present invention, a superelastic alloy wire which is a metal having superelastic properties is used as a core material.
Metals with superelastic properties have the property that the elongation strain becomes zero if the external stress is unloaded even if the metal is stretched far beyond the limit of ordinary elastic elongation. , Ti-50.5-51.5at% Ni
Ni-Ti binary alloys, more specifically, Ti:
A wire of a NiTi alloy of 49.2 at% and Ni: 50.8 at% is used. Further, N having the same superelastic property as N
i-Ti alloy with Cr, V, Co, Fe, Cu,
A ternary or quaternary alloy, a Cu-Zn-Al alloy, or a Cu-Al-Ni alloy containing one or more of Al, Zr, etc. in a total amount of 0.1 to 2.0 at%. Wires and the like can also be used. Also, a shape memory alloy-material is used as the core material.
It is modified sewing needle breakage and below A _s point which A _f
When heated to a point or more, the shape returns to the original shape. For example, as a typical example, there is a Ti-Ni binary alloy, and a wire of a Ti-49.5 to 50.8 at% Ni NiTi alloy is used. . More specifically, Ti: 50.2 at
%, Ni: 49.8 at% Ni-Ti alloy wire is used. Further, Ni-Ti exhibiting similar shape memory characteristics
Alloys with Cr, V, Co, Fe, Cu, Al, Z
one or more kinds of r, etc., in a total amount of 0.1 to
Ternary or quaternary alloy containing 2.0 at% or Cu
A wire rod of a -Zn-Al alloy or a Cu-Al-Ni alloy can also be used. The composition of the steel wire as the main structural material of the sewing needle is shown by wt% w according to JIS, and the composition of the superelastic alloy and the shape memory alloy is shown by at%.

The manufacture of the sewing needle of the present invention will be described. First, the manufacture of a composite material using a superelastic alloy wire as the core material of the steel of the main structural material is performed by forming the steel material of the main structural material into a tube, inserting the superelastic alloy wire into a composite material, There is a composite material obtained by gradually rolling a steel plate of a ribbon-shaped main structural material on an elastic alloy wire and coating and welding a seam, or a composite material by extrusion. In addition, a composite material in which a shape memory alloy wire is used as a core for steel as a main structural material is similarly manufactured.

[0011] Next, a step of hot rolling and / or cold rolling or / and drawing the raw material in which the core material of the superelastic alloy wire or the shape memory alloy wire is combined into a coiled steel wire, It comprises a straightening step, a cutting step to a predetermined length, a hole making step, a step of attaching a needle point, a heat treatment step for giving strength and the like, a final polishing step, and the like. Note that the heat treatment step needs to be performed at a temperature in consideration of the characteristics of the superelastic alloy or shape memory alloy as the core material. For example, the superelastic N
In the case of the i-Ti alloy, the heat treatment is preferably performed at a temperature at which the Ni-Ti alloy as the core material is not recrystallized. For that purpose, a heat treatment method of heating only the main structural material of the needle may be used.

[0012]

Embodiment 1 Embodiment 1 of the present invention will be described with reference to FIGS. 1A and 1B are diagrams showing a hand sewing needle according to an embodiment of the present invention, wherein FIG. 1A is a side view, FIG. 1B is a cross-sectional view taken along line AA, and FIG. 2A and 2B are views showing a conventional hand sewing needle, in which FIG. 2A is a side view, FIG.
(C) is a diagram showing a situation at the time of breaking.

[0013] The hand sewing needle of the present invention is used as a superelastic core material.
Ti: 49.2 at%, Ni: 50.8 at% Ni-
Using Ti alloy wire, C: 0.69-
0.75 wt%, Si: 0.15 to 0.35 wt%, M
n: 0.30 to 0.60 wt%, P: ≤ 0.030 wt%
%, S: ≦ 0.030 wt%, using a hard steel wire having the balance of Fe to produce a composite material, which is subjected to hot rolling and cold drawing to form a coiled wire, a straightening process, and a needle. A hand sewing needle (1) as shown in FIGS. 1 (a) and 1 (b) was obtained by a step of cutting into one length, a step of making a hole, a step of attaching a needle, and a final polishing step. The hand sewing needle (1) is composed of a main structural material (2) of a hard steel wire and a core material (3) of a superelastic Ni-Ti alloy wire, and has a hole (4). The outer diameter of the hand sewing needle (1) is 0.57 mmφ, and the core material (3) of the superelastic Ni—Ti alloy wire is 0.07 mm. Hand sewing needle (1) is 3
5 mm.

The conventional hand sewing needle shown in FIG. 2 is subjected to hot rolling and cold drawing using a hard steel wire rod having the same composition as that of the first embodiment to form a coiled wire rod. , Needle 1
It is manufactured by a process of cutting into a main length, a process of making a hole, a process of attaching a needle, and a final polishing process.

The hand sewing needle (1) was supported at both ends thereof by a span of 18 mm. When a force of 0.9 kg was applied to the center as shown by an arrow, the hand sewing needle (1) was broken and broken at the portion B, and the conventional hand sewing needle was used. (1) is (1 ′) (1 ′) as shown in FIG.
Separated. In the hand sewing needle (1) of the present invention shown in FIG. 1, although the main structural material (2) is broken at the portion B, the hand sewing needle (1) has a core material (3) of a superelastic Ni—Ti alloy wire. Did not separate. When the force shown by the arrow was unloaded, the superelastic Ni
-The elongation and distortion of the core material (3) of the Ti alloy wire were removed, and the material was almost in a state before being bent. For this reason, the broken needle could be easily removed from the fabric.

[0016]

Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. 3A and 3B are views showing a sewing needle and a hand sewing needle according to a second embodiment of the present invention, wherein FIG. 3A is a side view, FIG. 3B is a view in the direction of an arrow from the AA cross section, and FIG. It is a figure showing a situation. 2A and 2B are views showing a conventional sewing needle and a hand sewing needle, in which FIG. 2A is a side view, FIG.
(C) is a diagram showing a situation at the time of breaking.

According to the sewing machine needle of the present invention, a superelastic core material is used: Ni: T: 49.2—Ni: 50.8 at% Ni—T
Using i-alloy wire, C: 0.69-0.
75 wt%, Si: 0.15 to 0.35 wt%, Mn:
0.30 to 0.60 wt%, P: ≦ 0.030 wt%,
S: A raw material of a composite material is manufactured by using a hard steel wire rod of ≦ 0.030 wt% and the balance of Fe, which is subjected to hot rolling and cold drawing to form a coiled wire rod, a straightening process, a predetermined length. FIG. 3 shows a cutting process, a die forming process of a handle end, a forming process of a thread groove in a center, a punching process, a process of attaching a needle to a point, a heat treatment process for imparting strength and elasticity, and a final polishing process. As a result, a sewing needle (5) was obtained as shown in FIG. The conventional sewing needle shown in FIG. 4 is manufactured by using a wire having the same composition as in Example 2 and in the same process.

Sewing needle (5) shown in FIGS. 3 (a) and 3 (b)
Consists of a main structural material (6) and a core material (3) of a super-elastic Ni—Ti alloy wire, and has a wire portion (7), a handle end (8), and a hole (9).
Are formed. The illustration of the thread groove formed in the line portion (7) is omitted. The outer diameter of the sewing needle (5) is 0.69 mm
φ, super-elastic Ni-Ti alloy wire core material (3) is 0.07
mm. The length of the sewing needle (5) is 38 mm.

When a large force was applied to the sewing needle (5) as indicated by an arrow and the sewing needle (5) was folded at the portion B, the conventional sewing needle (5) was separated at the portion B as shown in FIG. The sewing needle (5) of the present invention shown in FIG. 3 breaks at the main structural material (6), but does not separate when the core material (3) of the super-elastic Ni—Ti alloy wire is provided. As a result, the core material (3) of the super-elastic Ni—Ti alloy wire was stretched and strained, and was almost in a state before being bent. For this reason, the broken needle could be easily removed from the fabric.

[0020]

As described above, according to the sewing needle of the present invention, a superelastic metal as a core material is used for a steel wire material as a main structural material.
Or it is made of a composite material provided with a shape memory alloy, it has no defects such as scratches on the surface, which is the original function of sewing needles, it is smooth and shiny, and a large force is applied at the time of sewing and it breaks by any chance Since there is no separation even in the case, there is an effect that the search and collection are easy.

[Brief description of the drawings]

FIG. 1 is a view showing a hand sewing needle according to a first embodiment of the present invention.

FIG. 2 is a view showing a conventional hand sewing needle;

FIG. 3 is a diagram showing a sewing needle according to a second embodiment of the present invention;

FIG. 4 is a view showing a conventional sewing needle.

[Explanation of symbols]

 1 Hand sewing needle 2 Main structural material 3 Core material 5 Sewing needle

Claims (4)

[Claims] 1. A sewing needle made of a steel wire, wherein the sewing needle is made of a composite material in which a superelastic alloy wire or a shape memory alloy wire is provided as a core on a steel wire as a main structural material. 2. The superelastic alloy wire of the core material is composed of Ni—Ti alloy, Ni—Ti alloy and Cr, V, Co, Fe, Cu, A.
One or more of l and Zr are added in a total amount of 0.1
Ternary or quaternary alloy containing ~ 2.0 at%, Cu-
The sewing needle according to claim 1, wherein the needle is a wire rod of one of a Zn-Al alloy and a Cu-Al-Ni alloy. 3. The shape memory alloy wire of the core material is Ni-Ti.
Alloy, Ni-Ti alloy with Cr, V, Co, Fe, Cu,
One or more of Al and Zr are added in a total amount of 0.1.
Ternary or quaternary alloy containing 1 to 2.0 at%, Cu
The sewing needle according to claim 1, wherein the needle is a wire rod of one of a Zn-Al alloy and a Cu-Al-Ni alloy. 4. The steel wire of the main structural material is a hard steel wire, Cr,
1.0 wt% C to which V, Mo carbide forming elements are added
Degree of hyper-coprecipitated steel wire or Cu with added Cu:
The sewing needle according to any one of claims 1 to 3, wherein the needle is 0.60 to 1.05 wt% steel.