CN115486614A - Metal fastener element for slide fastener, and method for manufacturing metal fastener element for slide fastener - Google Patents

Abstract

The invention aims to improve the appearance of the outer side surface of a metal zipper element. The metal fastener element for a slide fastener of the present invention includes a coupling head (2) and left and right legs (3). The left and right leg portions include: left and right leg bodies (31) extending in two from the engagement head; and left and right clamping portions (32) extending in directions approaching each other from the front end portions of the left and right foot main bodies. The left and right foot bodies are characterized in that the outer side surfaces thereof have portions which have only shearing surfaces (4) and no fracture surfaces (5) within a fixed width range. Since the outer side surface of the leg main body does not have a fracture surface within a fixed width range, the appearance of the metal fastener element is improved.

Description

Metal fastener element for slide fastener, and method for manufacturing metal fastener element for slide fastener

Technical Field

The present invention relates to a metal fastener element for a slide fastener and a method for manufacturing the same.

Background

As an example of a method for manufacturing a metal fastener element for a slide fastener, there is known a manufacturing method including: forming a convex-concave portion by press working for plastically deforming the metal plate in the thickness direction thereof to form a convex engaging portion and a concave engaging portion of the engaging head of the metal fastener element; and punching press work for punching out a metal fastener element as a product from the metal plate after the press work for forming the unevenness (patent document 1).

According to the manufacturing method disclosed in patent document 1, in the hole of the die used for punching press working, chamfering is applied to the inlet portion of the die with a curved surface having a radius of 0.01mm to 1.0mm, and the die is formed so as to be parallel to the depth direction at a position located on the back side of the chamfer with respect to the inlet portion. And the clearance between the male die and the female die is set to 0.1 to 10 μm.

Further, according to the manufacturing method disclosed in patent document 1, the left and right leg portions of the punched metal fastener element are inevitably formed with the cut surface and the fractured surface. Specifically, in the metal fastener element, the coupling head and the entire outer surfaces of the left and right legs are formed by the cut surface and the fracture surface, the ratio of the cut surface to the total area is 80% or more, and the ratio of the fracture surface to the total area is less than the remaining 20%. Further, since the surface roughness of the fracture surface is larger than that of the sheared surface, the appearance of the metal fastener element is improved by increasing the ratio of the sheared surface to the total area.

Fig. 8 shows a fastener element equivalent to the metal fastener element disclosed in patent document 1. This figure is a view of a copy of an image obtained by irradiating the left side surface of the metal fastener element 1a with light obliquely downward from above. In the figure, the outer side surface of the left leg portion 3a and the left side surface of the coupling head 2a are shown as the left side surface of the metal fastener element 1 a. In the image, the side surface of the metal fastener element is formed by a dark black portion and a white portion. The dark black part is the shear plane and the white part is the fracture plane. In this figure, a dark black portion (cut surface 4 a) is shown by parallel equally spaced thin lines, and a white portion (broken surface 5 a) is shown by white (this is a color distinction relating to only the side surface of the metal fastener element 1a, and the white of the portion other than the outer side surface of the metal fastener element 1a does not show the broken surface 5 a). As is clear from the figure, the sheared surface 4a occupies most of the outer surface of the left leg portion 3a (a portion other than the right edge portion), and the fractured surface 5a occupies the remaining small portion of the outer surface of the left leg portion 3a (the right edge portion).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2005-237532.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and an object thereof is to further improve the appearance of the outer surface of the metal fastener element.

Means for solving the problems

The metal zipper teeth for the zipper of the invention are provided with a coupling head part and a left foot part and a right foot part. The left and right leg portions include: left and right leg bodies extending in two branches from the engagement head; and left and right clamping portions extending in directions approaching each other from the front end portions of the left and right foot bodies. In addition, the left and right foot bodies have portions on their outer side surfaces that have only shear surfaces and no fracture surfaces within a fixed width range.

The fixed width range is, for example, as shown in 1) and 2) below. 1) The fixed width range is a range corresponding to the core portion of the band portion sandwiched between the left and right leg main bodies. 2) The fixed width range refers to the entire outer side surfaces of the left and right foot main bodies.

In addition, the portion having only the shear surface and not the fracture surface may be only the outer side surface of the foot main body or not. Further, the following is preferable. That is, the outer surface of the engagement head also has a portion having only the shear surface and no fracture surface.

The method for manufacturing a metal fastener element for a slide fastener of the present invention is premised on the provision of a press working for forming irregularities in which a metal plate is plastically deformed in its thickness direction to form an engaging convex portion and an engaging concave portion of an engaging head of the metal fastener element, and a press working for punching in which a metal fastener element as a product is punched out of the metal plate after the press working for forming irregularities. In the punching press process, the outer shape of the coupling head of the metal fastener element is formed, and the outer shapes of the left and right leg portions are formed, and the left and right leg portions include: left and right leg bodies extending in two branches from the engagement head; and left and right clamping portions extending in directions approaching each other from the front end portions of the left and right foot main bodies.

In addition, according to the method of manufacturing a metal fastener element for a slide fastener of the present invention, the die used for punching press working has an inclined portion having an inclined surface in a fixed width range in a portion corresponding to the outer side surfaces of the left and right leg main bodies at the entrance of the hole of the die, and the inclined surface is inclined with respect to the depth direction of the hole in a state where the width of the hole is narrowed toward the back side of the hole.

The fixed width range is, for example, as shown in 3) and 4) below. 3) The fixed width range is a range corresponding to the core portion of the band portion sandwiched between the left and right leg main bodies. 4) The fixed width range refers to the entire outer side surfaces of the left and right foot main bodies.

In addition, a portion having only the shear surface and not the fracture surface may be formed only on the outer side surface of the foot body. Further, the following is preferable. That is, in the die used for punching press working, the inclined portion is also provided at the inlet portion of the hole of the die and at the portion corresponding to the outer side surface of the engagement head.

Regardless of the details of the inclined surface, the following is preferred. That is, the inclined surface is inclined at an angle θ satisfying the following relational expression 1 with respect to the depth direction of the hole, relational expression 1:0 DEG < theta < 30 deg. More preferably, relational expression 1 is as follows. Relation 1:10 DEG ≦ theta ≦ 28 deg.

Effects of the invention

Since the metal fastener element for a slide fastener of the present invention has only the cut surface and no fracture surface in the fixed width range on the outer side surfaces of the left and right leg bodies, the external appearance of the metal fastener element is improved as compared with the metal fastener element having fracture surfaces on the outer side surfaces.

Further, according to the method of manufacturing the metal fastener element for a slide fastener of the present invention, since the inclined portion having the inclined surface is formed at the entrance portion of the hole of the die, the inclined surface being inclined with respect to the depth direction of the hole in a state where the width of the hole is narrowed toward the back side of the hole, the fixed width range of the outer side surfaces of the left and right leg portions is formed in a state of being pressed by the inclined surface during the passage of the inclined surface in the punching press working, and as a result, only the shear surface is formed without breaking (without forming a mark of separation) in the thickness range of the metal fastener element in the fixed width range of the outer side surfaces of the left and right leg portions, and the appearance of the outer side surfaces of the left and right leg portions is improved as compared with the manufacturing method using the press working in which only the metal fastener element is punched from the metal plate.

Drawings

Fig. 1 is a perspective view showing a metal fastener element for a slide fastener according to a first embodiment of the present invention;

fig. 2 (a) and 2 (B) are drawings showing metal fastener elements in a state where left and right legs are opened and closed, respectively, in comparison;

FIG. 3 is a left side view of a metal zipper element;

fig. 4 is a plan view showing a slide fastener using metal fastener elements;

fig. 5 is a plan view showing a method of manufacturing a metal fastener element for a slide fastener according to a first embodiment of the present invention;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

fig. 8 is a left side view showing an example of a conventional metal fastener element for a slide fastener.

Detailed Description

As shown in fig. 4, the metal fastener element 1 for a slide fastener is fixed to the side edge portions of the pair of tape portions 9 which face each other with a space therebetween. As a result, the plurality of metal fastener elements 1 are aligned in a row along the longitudinal direction of the side edge portion on the side edge portion of each tape portion 9 provided to face each other. The plurality of metal fastener elements 1 arranged in a row are referred to as a fastener element row. When a slider, not shown, is moved in one direction along a pair of element rows provided so as to face each other, the metal fastener elements 1 of the opposing element rows are engaged with each other, and further, the pair of tape portions 9 are closed, and when the slider is moved in the opposite direction, the engagement between the metal fastener elements 1 of the opposing element rows is released, and further, the pair of tape portions 9 are opened.

As shown in fig. 1 and 2, a metal fastener element 1 according to a first embodiment of the present invention is configured by a coupling head 2 for coupling with another metal fastener element 1, and a pair of legs 3 attached to the coupling head 2 with side edges of a tape portion 9 interposed therebetween and extending in two from the coupling head 2. The metal fastener element 1 is made of, for example, an aluminum alloy.

The directions required for explaining the metal fastener element 1 are defined as follows with reference to fig. 2. The "left-right direction" is a direction in which the pair of legs 3 are separated from each other, and is the left-right direction in fig. 2. The left-right direction coincides with the thickness direction of the belt portion 9. The "upward direction" refers to a direction of the engaging head 2 with respect to the pair of leg portions 3, and is an upward direction in fig. 2. The "downward direction" refers to a direction of the pair of leg portions 3 with respect to the engaging head portion 2, and is a downward direction in fig. 2. The vertical direction coincides with the width direction of the belt portion 9. The "front-rear direction" is a direction orthogonal to the left-right direction and the up-down direction, and is a direction orthogonal to the paper surface in fig. 2. The "front-back direction" also refers to the thickness direction of the metal fastener element 1.

The engaging head 2 includes a head body 21, engaging protrusions 22 and engaging recesses 23 which are formed on both front and rear surfaces of the head body 21 so as to be concave and convex relative to each other. That is, the engagement head 2 includes (see fig. 3): engaging projections 22 projecting on both front and rear surfaces of the head main body 21; and engaging recesses 23 recessed on both front and rear surfaces of the head main body 21. In the present embodiment, the metal fastener element 1 having the coupling convex portion 22 and the coupling concave portion 23 on both the front and rear surfaces of the head main body 21 is described, but the present invention can also be applied to a metal fastener element having only the coupling concave portion on one of the front and rear surfaces of the head main body 21 and only the coupling convex portion on the other surface.

In the head main body 21, a lower portion thereof is a joint portion 25 to which the left and right leg portions 3 are joined, an upper side than the joint portion 25 is a flat plate portion 26, and the flat plate portion 26 extends upward than both front and rear surfaces of the joint portion 25 in a state of being recessed in a step shape. The joint portion 25 is formed in a U shape opened toward the upper side on both front and rear surfaces. The front and rear surfaces of the metal fastener element 1 (both surfaces of the metal fastener element 1 in the thickness direction) are parallel planes at the joining portion 25 and the left and right leg portions 3. More specifically, the front surface of the engagement portion 25 and the front surfaces of the left and right leg portions 3 are coplanar, i.e., located on the same plane, and the rear surface of the engagement portion 25 and the rear surfaces of the left and right leg portions 3 are also coplanar and parallel to the front surfaces of the engagement portion 25 and the front surfaces of the left and right leg portions 3. In the flat plate portion 26, the central portions of the front and rear surfaces are portions where the engagement convex portions 22 protrude. The lower side (leg portion 3 side) of the engaging convex portion 22 of both front and rear surfaces of the flat plate portion 26 is formed as a surface recessed in a step shape from the engaging convex portion 22 and the joint portion 25, and as a result, the engaging concave portion 23 surrounded by the engaging convex portion 22 and the joint portion 25 is formed on both front and rear surfaces of the flat plate portion 26 (head main body 21).

The left and right leg portions 3 include: left and right leg main bodies 31 extending in two from the engaging head 2; and left and right clamping portions 32 extending from the front end portions (lower end portions) of the left and right leg main bodies 31 in directions approaching each other. Fig. 2 (a) shows a state before the metal fastener element 1 is attached to the tape portion 9. In this state, the left and right leg bodies 31 are formed in a shape in which the left and right intervals are enlarged downward. Fig. 2 (B) shows a state where the metal fastener element 1 is attached to the tape portion 9. In the belt portion 9, a side edge portion facing the other belt portion 9, not shown, is formed thicker than the opposite side. This thick portion is referred to as a core 9a. On the other hand, a portion of a small thickness adjacent to the core portion 9a is referred to as a band body portion 9b. That is, the band 9 includes a band body 9b and a core portion 9a, and the core portion 9a is adjacent to one end of the band body 9b in the width direction. In a state of being attached to the band portion 9, most of the outer side surfaces of the left and right leg main bodies 31 are formed in a substantially parallel shape in the vertical direction, and the core portion 9a is accommodated inside. The left and right clamp portions 32 hold the band portion body portion 9b therebetween so as not to drop the core portion 9a. In the state shown in fig. 2B, in the metal fastener element 1, the surfaces (upper surface and lower surface) facing in the vertical direction are set to be substantially parallel to the thickness direction of the tape portion 9, and the surface (outer surface) facing in the horizontal direction is set to be substantially parallel to the width direction of the tape portion 9. In addition, in the metal fastener element 1, the corner portion C1 where the upper surface and the left and right outer side surfaces intersect is a curved surface C1 smoothly continuous in a shape bulging in an arc shape, and the corner portion C2 where the lower surface and the left and right outer side surfaces intersect is also a curved surface C2 smoothly continuous in a shape bulging in an arc shape.

The metal fastener element 1 described above has a fixed width range (hereinafter, referred to as "total shear plane range" in the present specification) formed only by the shear plane 4 on the outer side surfaces of the left and right leg main bodies 31. Further, the outer surface of the metal fastener element 1 includes a sheared surface 4 and a fractured surface 5 except for the total sheared surface range. Hereinafter, a plurality of examples in which the total sheared surface area is provided on the outer side surface of the metal fastener element 1 will be described with reference to fig. 2 (B). The premise is based on the state in which the metal fastener element 1 is attached to the tape portion 9, that is, the state in fig. 2 (B).

In this reference state, the first example of the total cut surface range of the metal fastener element 1 is directed to the outer side surfaces of the left and right leg main bodies 31, and is as follows. In the reference state, the pair of clamping surfaces 32a are formed in the left and right clamping portions 32 of the metal fastener element 1, and the clamping surfaces 32a clamp the tape portion body 9b of the tape portion 9 in the thickness direction of the tape portion body 9b of the tape portion 9 and are parallel flat surfaces. A virtual line L1 is drawn in the thickness direction of the tape portion 9 from an end point of the holding surface 32a on the side of the core portion 9a. The virtual line L1 is a first boundary line L1 that divides the total cut surface range and the portion other than the total cut surface range of the left and right leg main bodies 31.

In the reference state shown in fig. 2 (B), a virtual line L2 is drawn in the thickness direction of the belt portion 9 from the widthwise outermost end portion of the belt portion 9 formed in the space between the left and right leg portions 3. The virtual line L2 is a second boundary line L2 that divides the total cut surface range and the portion other than the total cut surface range of the left and right leg main bodies 31.

Therefore, the total shearing plane range of the left foot body 31 is a range S1 located on the left side surface of the left foot body 31 and between a first boundary line L1 and a second boundary line L2. Similarly, the total shearing surface range of the right leg main body 31 is a range S2 located on the right side surface of the right leg main body 31 and between the right first boundary line L1 and the right second boundary line L2. As described above, the first example of the total cutout surface range of the metal fastener element 1 is the range S1 and S2 between the left and right first boundary lines L1 and the left and right second boundary lines L2, in other words, the range S1 and S2 corresponding to the core portion 9a of the tape portion 9 sandwiched between the left and right leg bodies 31, because the leg bodies 31 are the subject.

In the reference state shown in fig. 2 (B), a second example of the total shear plane range of the metal fastener element 1 is for the joint portion 25 between the left and right leg main bodies 31 and the coupling head 2, and is as follows. As described above, the front and rear surfaces of the U-shaped joining portion 25 opened upward are formed on the same plane as the front and rear surfaces of the left and right leg portions 3. Then, a virtual line L3 is drawn in the thickness direction of the tape portion 9 from one end of each of the front and rear surfaces of the joint portion 25, which is farthest from the leg portion 3. The virtual line L3 is a third boundary line L3 that divides the total cut surface range of the metal fastener element 1 and a portion other than the total cut surface range. A second example of the total shear plane range of the metal fastener element 1 is ranges S3 and S4 between the left and right first boundary lines L1 and the left and right third boundary lines L3, and in short, is a shape in which the outer side surface of the coupling head 2 and the outer side surfaces of the left and right leg main bodies 31 are continuous.

In the reference state shown in fig. 2 (B), a third example of the total shear plane range of the metal fastener element 1 is directed to the entire outer side surface of the metal fastener element 1, and therefore, is as follows. As described above, in the metal fastener element 1, the upper surface is formed substantially parallel to the thickness direction of the tape portion 9, and the upper left and right corner portions C1 are formed as curved surfaces C1 having a shape bulging in an arc shape. A virtual line L4 is drawn from the uppermost point on the curved surface C1 in the thickness direction of the belt portion 9. The virtual line L4 is an upper limit boundary line L4 that divides the total cut surface range of the metal fastener element 1 and a portion other than the total cut surface range. As described above, in the metal fastener element 1, the lower surface is formed substantially parallel to the thickness direction of the tape portion 9, and the lower left and right corner portions C2 are formed as curved surfaces C2 having a shape bulging in an arc. A virtual line L0 is drawn from the lowermost point of the curved surface C2 in the thickness direction of the belt portion 9. The virtual line L0 is a lower limit boundary line L0 that divides the total cut surface range of the metal fastener element 1 and a portion other than the total cut surface range. A third example of the total cut surface range of the metal fastener element 1 is ranges S5 and S6 between the upper left and right boundaries L4 and the lower left and right boundaries L0, and in short, the entire left and right outer side surfaces of the metal fastener element 1, more specifically, the entire outer side surfaces of the left and right leg main bodies 31 and the entire left and right outer side surfaces of the coupling head 2 are continuous. The entire outer side surfaces of the left and right leg bodies 31 are ranges S7 and S8 between the left and right lower limit line L0 and the left and right second limit line L2.

The first to third examples of the total cut surface range indicated in the reference state shown in fig. 2 (B) are examples of providing the total cut surface range, and the total cut surface range may be provided over a range of a fixed width at least on the outer side surface of the leg main body 31 and over the entire surface in the thickness direction of the metal fastener element 1. Preferably, the total shear plane extent is provided on the entire outer side that is visible to a user of the zipper product (garment, bag, etc.) when the zipper is installed.

In fig. 1 and 3, the sheared surfaces 4 are also shown by parallel thin lines at equal intervals in the same manner as in fig. 8. In fig. 1, the entire outer side surfaces of the left and right leg main bodies 31 and the entire outer side surfaces of the joint portions 25 are referred to as a total sheared surface range, and in fig. 3, the entire left and right outer side surfaces of the metal fastener element 1 are referred to as a total sheared surface range. The outer side surfaces of the left and right leg main bodies 31 are formed only by the sheared surfaces 4 sheared in the penetrating direction (front-rear direction) of the space formed between the left and right legs 3.

The shear surface 4 has a surface roughness (arithmetic mean roughness) Ra of 1.0a or less. The surface roughness (arithmetic mean roughness) Ra of the fracture surface 5 is larger than 1.0 a. This value is obtained by rounding the second decimal value with respect to the unit a.

As shown in fig. 5, in the method of manufacturing the metal fastener element 1 for a slide fastener according to the first embodiment, the metal plate 7 is stopped at least intermittently 2 times while conveying the metal plate 7, and the metal fastener element 1 according to the first embodiment is continuously manufactured from the metal plate 7 by applying press working to each stop period of the 2 times. Each letter a and B shown in fig. 5 indicates a position of each press working in the conveyance path. Note that the shaded area in fig. 5 is a processing area where press processing is performed. The metal plate 7 is strip-shaped and has a thickness corresponding to the thickness of the left and right leg portions 3 and the joint portion 25 of the engaging head 2.

In the first press working indicated by a in fig. 5, the metal plate 7 is plastically deformed in the thickness direction thereof using a die, not shown, to form the coupling convex portion 22 and the coupling concave portion 23 of the coupling head 2 of the metal fastener element 1. That is, the first press working is press working for forming the concave-convex of the engaging head 2.

Next, the second press working shown in B in fig. 5 is a punching press working for punching out the metal fastener element 1 as a product from the metal plate 7 after the press working for forming the unevenness. More specifically, in the second press working, the inner hatched area defined by the one-dot chain line in the drawing (the inner part of the outer shape of the metal fastener element 1) is punched out of the metal plate 7, and as shown by C in fig. 5, the outer shape of the metal fastener element 1, that is, the outer shapes of the coupling head 2 and the left and right leg portions 3 are formed. As shown in fig. 1, the sheared surfaces 4 and the fractured surfaces 5 are formed in the portions of the right and left leg main bodies 31 on the outer side surfaces of the metal fastener element 1 other than the total sheared surface range, but only the sheared surfaces 4 may be formed in the total sheared surface range of the right and left leg main bodies 31 without forming the fractured surfaces 5.

Fig. 6 and 7 show cross-sectional views of the punch 11 and the die 12 used in the second press working (cross-sectional views of lines VI-VI and VII-VII in fig. 5). The punch 11 is formed to have an outer shape slightly smaller than an outer shape corresponding to both the left and right leg portions 3 and the joint portion 25 of the engagement head 2 (hereinafter, an outer shape of the back portion h2 of the hole h of the die 12). The portion of the die 12 for placing the metal plate 7 is formed with a width for the metal plate 7 to be placed stably enough.

In the present specification, the side of the hole h of the die 12 into which the metal fastener element 1 enters at the time of punching is referred to as an entrance portion h1 and the back side of the hole h with respect to the entrance portion h1 is referred to as a back side portion h 2.

The back side portion h2 is formed in a shape corresponding to the outer shape of the metal fastener element 1, and is formed as a plane parallel to the depth direction.

The entrance h1 is formed to have an outer shape slightly larger than that of the metal fastener element 1. In the inlet h1 of the hole h, a portion corresponding to the total shearing surface range of the left and right leg main bodies 31 is defined as "an inclined portion having only an inclined surface for forming a shearing surface" (hereinafter, simply referred to as "inclined portion"). The depth of the inclined surface of the inlet h1 is, for example, 0.20mm to 0.30mm. This value is obtained by rounding the value of the third decimal place in mm. On the other hand, as in the manufacturing method disclosed in patent document 1 of the related art, the portion of the inlet portion h1 of the hole h where the inclined portion is not formed is subjected to chamfering with a radius of 0.01mm to 1.0mm (the value is obtained by rounding off the value of the third position after the decimal point with respect to the unit mm) or is subjected to chamfering smaller than the radius, and a curved surface smoothly continuous in a shape bulging in an arc shape is formed by the chamfering. In addition, the portion of the inlet portion h1 of the hole h where the inclined portion is not formed is a surface parallel to the depth direction on the back side of the curved surface to which the chamfer is applied.

In the embodiment of fig. 6 and 7, the entire inclined portion is described as an inclined surface for the sake of easy understanding of the description, but in practice, the entire inclined portion is not necessarily required to be an inclined surface, and it is preferable that a curved surface is provided by chamfering in addition to the inclined surface, and the curved surface smoothly continues in a shape bulging in an arc shape with respect to the inclined surface. For example, substantially the entire surface of the inlet portion h1 in the depth direction may be an inclined surface, and a corner portion between the inlet portion h1 and the back side portion h2 may be a curved surface smoothly continuous with the inclined surface in a shape bulging in an arc shape (for example, a curved surface formed by chamfering a radius of 0.01mm to 1.0mm, in which a value obtained by rounding off a value of the third place after a decimal point with respect to a unit mm), or a corner portion between the inlet portion h1 and the upper surface of the die 12 may be a curved surface smoothly continuous with the inclined surface in a shape bulging in an arc shape.

The entire inclined surface is linearly inclined with respect to the depth direction of the hole h. The inclined state is a state in which the width of the hole h is narrowed toward the back side of the hole h. That is, the inclined surface is inclined with respect to the depth direction of the hole h in a state where the width of the hole is narrowed toward the back side of the hole h. Further, the inclined surface is inclined at an angle θ satisfying the following relational expression 1 with respect to the depth direction of the hole h. The depth direction means a linear direction of the reciprocating motion of the punch 11. The relation 1 is 0 DEG < theta ≦ 30 deg. It is preferable that the relational expression 1 is in a range of 10 ° ≦ θ ≦ 28 °, and more preferably, the relational expression 1 is in a range of 15 ° ≦ θ ≦ 25 ° (the values obtained by rounding off the first value after decimal point at 10 °, 20 °, 25 °, 28 °, 30 °).

Here, the meaning of the inclined surface will be described supplementarily. In the second press working, the metal fastener element 1 is punched out from the metal plate 7 in a separated manner, and the separated portion is regarded as a fracture surface. In the present invention, the inclined surface is provided, so that the timing at which the metal fastener element 1 is peeled from the metal plate 7 is delayed, and the metal fastener element 1 can be peeled beyond the upper surface in the thickness direction. Thus, a trace of separation of the metal fastener element 1 from the metal plate 7, that is, a surface free from a fracture surface can be formed within the range in the thickness direction. On the other hand, as described in the conventional example, when the entrance portion h1 of the hole h of the die 12 is chamfered with a radius of 0.01mm to 1.0mm and the back side of the hole h is formed parallel to the depth direction with respect to the chamfered portion, even if most of the portions can be formed as sheared surfaces, a trace of the metal fastener element 1 being peeled from the metal plate 7 is left in the range of the thickness direction of the metal fastener element 1. Therefore, the inclined surface in the present invention needs to have a certain length so that a trace of peeling of the metal fastener element 1 from the metal plate 7 does not remain in the range of the metal fastener element 1 in the thickness direction.

Among the clearances between the punch 11 and the die 12, the clearance T at the back side portion h2 of the hole h with respect to the inclined portion satisfies the following relational expression 2. Relation 2: t is more than 0.1 mu m and less than 10 mu m.

It is preferable that finish processing such as barrel polishing or chemical polishing is applied to the metal fastener element 1 after the second press step. The metal fastener element 1 of the first embodiment is a finished fastener element.

Since the metal fastener element 1 of the first embodiment manufactured by the method of manufacturing the metal fastener element 1 for a slide fastener of the first embodiment described above does not have the fracture surface 5 in the range of the total shear surface of the outer side surfaces of the left and right leg main bodies 31 or the outer side surface of the coupling head 2, the appearance of the metal fastener element 1 is improved compared to the metal fastener element 1 having the fracture surface 5 on the outer side surface. The larger the total shear plane range is, the more the appearance of the metal fastener element 1 is improved.

In the method of manufacturing the metal fastener element 1 for a slide fastener according to the first embodiment, since the inclined portion including the inclined surface is formed in the entrance portion h1 of the hole h of the die 12 and the outer side surfaces of the left and right leg bodies 31 are pressed by the inclined surface while passing through the inclined surface in the punching press working, the outer side surfaces of the left and right leg bodies 31 are not broken (no peeling mark is formed) in the thickness range of the metal fastener element and only the cut surface 4 is formed, and the appearance of the outer side surfaces of the left and right leg bodies 31 is improved as compared with the manufacturing method using the press working in which only the metal fastener element is punched out of a metal plate. Then, the inclined surface satisfies the relational expression 1, and in addition, the surface roughness of the sheared surface 4 is desirably set so that the clearance T of the back side portion h2 of the hole h with respect to the inclined surface among the clearances between the punch 11 and the die 12 used in the second press working satisfies the relational expression 2.

The present invention is not limited to the above-described embodiments, and can be modified as appropriate within a scope not departing from the gist thereof.

Description of the symbols:

1. metal zipper teeth

2. Engaging head

21. Head body

22. Engaging projection

23. Engaging recess

25. Joint part

26. Flat plate part

3. Foot part

31. Foot body

32. Clamping part

32a clamping surface

4. Shear plane

5. Fracture surface

7. Metal plate

9. Band part

9a core part

9b band body

11. Male die

12. Concave die

C1, C2 corner (curved surface)

h hole

h1 Inlet section

h2 Inner side part

L0 virtual line (lower limit line of demarcation)

L1 virtual line (first boundary line)

L2 virtual line (second boundary line)

L3 virtual line (third demarcation line)

L4 virtual line (Upper limit line)

T gap

S1, S2, S3, S4, S5, S6, S7, S8 ranges

The angle theta.

Claims (10)

1. A metal zipper tooth (1) for a zipper, characterized in that,

the metal zipper teeth (1) for the zipper are provided with a coupling head part (2) and a left foot part and a right foot part (3),

the left and right leg portions (3) include: left and right leg bodies (31) extending in two from the engagement head (2); and left and right clamping portions (32) extending in directions approaching each other from the front end portions of the left and right leg main bodies (31),

the left and right leg bodies (31) have portions on the outer side surfaces thereof, which have only the shear surfaces (4) and no fracture surfaces (5) within a fixed width range.

2. The metal fastener element (1) for slide fastener according to claim 1,

the fixed width ranges are ranges (S1, S2) corresponding to core portions (91) of band portions (9) held between the right and left leg main bodies (31).

3. The metal fastener element (1) for slide fastener according to claim 2,

the fixed width range refers to the entire outer side surfaces (S7, S8) of the left and right leg bodies (31).

4. The metal fastener element (1) for slide fastener according to any one of claims 1 to 3,

the outer side surface of the engagement head (2) also has a portion that has only a shear surface (4) and no fracture surface (5).

5. A method for manufacturing a metal fastener element (1) for a slide fastener, comprising:

forming a convex-concave portion by press working for plastically deforming the metal plate (7) in the thickness direction thereof to form a coupling convex portion (22) and a coupling concave portion (23) of a coupling head (2) of the metal fastener element (1); and

a punching press process for punching out the metal fastener element (1) as a product from the metal plate (7) after the press process for forming the unevenness,

in the punching press process, the outer shape of the coupling head (2) of the metal fastener element (1) is formed and the outer shape of the left and right leg parts (3) is formed, and the left and right leg parts (3) are provided with: left and right leg bodies (31) extending in two branches from the engagement head (2); and left and right clamping portions (32) extending in directions approaching each other from the front end portions of the left and right leg main bodies (31),

the female die (12) used in the punching press work has an inclined portion having an inclined surface in a fixed width range in an inlet portion (h 1) of a hole (h) of the female die (12) and a portion corresponding to the outer side surfaces of the left and right leg main bodies (31),

the inclined surface is inclined with respect to the depth direction of the hole (h) in a state that the width of the hole (h) is narrowed toward the back side of the hole (h).

6. The method of manufacturing a metal fastener element (1) for a slide fastener according to claim 5,

the fixed width range is a range corresponding to a core part (91) of the band part (9) clamped by the left and right foot main bodies (31).

7. The method of manufacturing a metal fastener element (1) for a slide fastener according to claim 5,

the fixed width range refers to the entire outer side surface of the right and left foot bodies (31).

8. The method for manufacturing a metal fastener element (1) for a slide fastener according to any one of claims 5 to 7,

the die (12) used in the punching press is also provided with an inclined portion at an inlet portion (h 1) of the hole (h) of the die (12) and at a portion corresponding to the outer side surface of the engaging head (2).

9. The method for manufacturing a metal fastener element (1) for a slide fastener according to any one of claims 5 to 7,

the inclined surface is inclined at an angle theta satisfying the following relational expression 1 with respect to the depth direction of the hole (h),

relation 1:0 DEG < theta ≦ 30 deg.

10. The method for manufacturing a metal fastener element (1) for a slide fastener according to any one of claims 5 to 7,

the inclined surface is inclined at an angle theta satisfying the following relational expression 1 with respect to the depth direction of the hole (h),

relation 1:10 DEG ≦ theta ≦ 28 deg.

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