JPH09151918A - Manufacture of nail and molding dice thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hardness of pulling out a nail by pointing a range of approximately more than a half length of a barrel part from a head part side to a sharp tip part side to be formed in slant state so as to be gradually thickened. SOLUTION: A barrel part 3 consists of a slant-shape part 3a and an uniformly thick part 3b. The part 3a occupies approximately more than a half of the total length of the barrel part 3 and has a taper of 20/1000 to 4/1000 grade gradually thickened toward a sharp tip part 2 side from a head part 1 side. The purpose of the part 3b is to improve the advancing property of a nail to be driven in. The manufacture therefor is to feed the tip part of a steel wire S into a dice 7 and the tip end of the steel wire S is projected by a proper size from a head part molding surface 9 and fixed, the tip end of the steel wire S is given impact by a punch 14 so as to form the head part 1. Next, the back of the punch 14 is hit by a punch 15 so as to press the steel wire S onto a slant part molding surface 10 and a linear part molding surface 11 so as to form the parts 3a, 3b. The steel wire S is fixed after being fed by specific length, cut by a cutter 8 so as to mold the sharp tip part 2. Accordingly, any connection structure formed by nails can be made economical and intensified.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、釘並びにその成形
型及び、釘の製法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nail, a mold for the nail, and a method for manufacturing the nail.

【０００２】[0002]

【従来の技術】一般に使用されている釘は、頭部及び先
鋭部を形成されると共に頭部から先鋭部に至る胴部は一
様太さのものとなされている。2. Description of the Related Art Generally used nails have a head portion and a sharpened portion, and a body portion from the head portion to the sharpened portion has a uniform thickness.

【０００３】[0003]

【発明が解決しようとする課題】上記した在来の釘で結
合された結合構造部は殆どの場合、釘が木材などの被結
合部材から抜け出ることにより、その剛結状態が損なわ
れるものとなる。In most cases, the above-mentioned conventional connecting structure joined by a nail is damaged by the nail coming out of a member to be joined such as wood. .

【０００４】したがって、結合構造部の剛結状態を維持
させるには釘を抜け出し難くなすことが効果的な処理と
なるのであり、斯かる実情から、本出願人は少しでも抜
け出し難い釘を実現させようとするものである。Therefore, in order to maintain the rigid connection state of the joint structure, it is an effective treatment to make the nail difficult to slip out. From such a situation, the applicant has realized a nail that is hard to slip out even a little. It is something to try.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するた
め、本発明の釘においては、胴部の凡そ半分長さ以上の
範囲を頭部側から先鋭部側へ向けて漸次太くなるような
傾斜状に形成するのである。In order to achieve the above object, in the nail of the present invention, an inclination in which the range of about half the length of the trunk portion or more gradually increases from the head side to the sharpened side. It is formed into a shape.

【０００６】このさい、釘の真っ直ぐな打ち込み処理を
容易となすため、傾斜状に形成した部分よりも先鋭部側
となる胴部先端部は同部分の先鋭部側の端部の直径と同
一の直径の一様太さとなすのがよい。At this time, in order to facilitate the straight driving operation of the nail, the tip of the body, which is on the sharpened side of the inclined portion, has the same diameter as that of the sharpened side of the same portion. It should have a uniform diameter.

【０００７】さらに、効率的な製造を可能とするため、
傾斜状に形成した部分よりも頭部側の胴部の比較的短い
範囲に、同部分の頭部側の端部の直径と同一の直径の一
様太さ部を形成するのがよい。Further, in order to enable efficient manufacturing,
It is preferable to form a uniform thickness portion having the same diameter as the diameter of the end portion on the head side of the portion in a relatively short range of the body portion on the head side of the inclined portion.

【０００８】しかして、本発明の釘の製造においては、
釘の胴部の凡そ半分長さ以上の範囲に相当する鋼線材部
分を、冷間鍛造により、頭部側から先鋭部側へ向けて漸
次太くなるような傾斜状に成形するように実施する。In the manufacture of the nail of the present invention, however,
The steel wire rod portion corresponding to a range of approximately half the length or more of the body portion of the nail is formed by cold forging so as to be formed into an inclined shape that gradually becomes thicker from the head side to the sharpened side.

【０００９】具体的には、頭部成形面及び傾斜状部形成
面を具備した成形型を用い、鋼線材を頭部成形面及び傾
斜状部形成面の内方に押し込むように行う。Specifically, a forming die having a head forming surface and an inclined portion forming surface is used, and a steel wire rod is pushed into the head forming surface and the inclined portion forming surface.

【００１０】このさい、成形型は釘の胴部の凡そ半分長
さ以上の範囲を頭部側から先鋭部側へ向けて漸次太くな
るような傾斜状に形成するための傾斜状成形面のみを具
備したものとなし、頭部とは別途に傾斜状の部分を成形
するようにしてもよい。At this time, the forming die has only an inclined forming surface for forming an area in which the body length of the nail is about half the length or more in such a manner that it gradually becomes thicker from the head side to the sharpened side. Alternatively, the inclined portion may be formed separately from the head portion.

【００１１】[0011]

【発明の実施の形態】図１は本発明に係る釘を示すもの
であり、図２は同釘の部分拡大図である。図において、
１は頭部、２は先鋭部、そして３は胴部である。ここに
胴部３は頭部１から先鋭部２に至る部分を言うものとす
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a nail according to the present invention, and FIG. 2 is a partially enlarged view of the nail. In the figure,
1 is the head, 2 is the sharpened portion, and 3 is the trunk. Here, the body portion 3 refers to a portion from the head portion 1 to the sharpened portion 2.

【００１２】この胴部３は傾斜状の部分３ａと一様太さ
部分３ｂからなるものとなしてある。The body 3 is composed of an inclined portion 3a and a uniform thickness portion 3b.

【００１３】しかして傾斜状の部分３ａは具体的には次
のようになす。即ち、胴部３の全長の凡そ半分以上の範
囲にわたるもので、頭部１側から先鋭部２側へ向けて漸
次太くなるようになすのであり、図示例ではテーパとな
してある。However, the inclined portion 3a is specifically formed as follows. That is, the length of the body portion 3 is about half or more of the entire length, and the body portion 3 gradually increases in thickness from the head portion 1 side to the sharpened portion 2 side, and is tapered in the illustrated example.

【００１４】このテーパは凡そ２０／１０００〜４／１
０００程度となし、通常では凡そ６／１０００程度にな
す。このさい、テーパが大きすぎると頭部１側の端部が
細くなり過ぎて打ち込みのさいの強度などに問題が生
じ、また頭部１側の端部を適当太さに維持すると先鋭部
２側の端部が不必要に太くなり過ぎるのであり、一方、
テーパが小さすぎると本発明の作用が得られなくなるの
である。This taper is approximately 20/1000 to 4/1.
Approximately 000, and usually about 6/1000. At this time, if the taper is too large, the end on the head 1 side becomes too thin, which causes a problem in the strength of driving, and if the end on the head 1 side is maintained to have an appropriate thickness, the sharp end 2 side is formed. The ends of are unnecessarily too thick, while
If the taper is too small, the effect of the present invention cannot be obtained.

【００１５】また一様太さ部分３ｂは釘の打ち込みのさ
いの直進性を良好となすためのもので、胴部３の全長の
凡そ１割程度以下で足りるのであり、場合によってはこ
れよりも長くなしてもよく、また全く存在させなくても
よいものである。Further, the uniform thickness portion 3b is for improving the straightness of the nail driving, and it is sufficient that it is about 10% or less of the entire length of the body portion 3, and in some cases, it is more than this. It may be long or may not exist at all.

【００１６】本発明の釘は上記のとおりであるが、これ
を適宜に変形することは任意になし得ることである。例
えば、胴部３の最も頭部１側となる極く短い部分を、前
記一様太さの部分３ｂと概ね同一直径の一様太さとなし
たり又は傾斜状の部分３ａの最も頭部１側の直径と同一
直径の一様太さとなすなどである。前者によれば、打ち
込んだ後の釘の直立姿勢の安定性に優れ、また後者によ
れば後述するように釘の効率的製造に寄与するものとな
る。Although the nail of the present invention is as described above, it can be arbitrarily modified. For example, an extremely short portion of the body 3 that is closest to the head 1 has a uniform thickness of approximately the same diameter as the portion 3b having the uniform thickness, or the most head 1 side of the inclined portion 3a. It has the same diameter and the same diameter. According to the former, the stability of the upright posture of the nail after driving is excellent, and according to the latter, it contributes to efficient manufacture of the nail as described later.

【００１７】本出願人は図１に示す本発明釘の抜け出し
に対する抵抗性を実験をしてみたのであり、その内容は
次のとおりである。The applicant of the present invention has conducted an experiment on the resistance of the nail of the present invention shown in FIG. 1 to the escape, and the contents thereof are as follows.

【００１８】例えば釘の寸法は、全長を１２６ｍｍ、傾
斜状の部分３ａの長さを１０７ｍｍ、一様太さの部分３
ｂの長さを８ｍｍとなし、また傾斜状の部分３ａの頭部
１側の端部の直径を４ｍｍ、同部分３ａの先鋭部２側の
端部のそれを４．６ｍｍとした。For example, the nail has a total length of 126 mm, an inclined portion 3a of 107 mm in length, and a portion 3 of uniform thickness.
The length of b was 8 mm, the diameter of the end of the inclined portion 3a on the head 1 side was 4 mm, and the diameter of the end of the same portion 3a on the sharpened portion 2 side was 4.6 mm.

【００１９】この実験用本発明釘を図３に示すように二
つの被結合部材ｗ１、ｗ２である木材に貫通状に打ち込
んだ。このさいの打ち込み処理において、釘が曲がると
か打ち込み難いなどの問題は全くなかった。As shown in FIG. 3, this experimental nail of the present invention was pierced into wood, which is two members to be coupled w1 and w2. In this driving process, there were no problems such as bending of the nail or difficulty in driving.

【００２０】この一方では、全長が１２６ｍｍ、直径が
４．６ｍｍの一様太さの直状の従来釘を図３に示したと
同様に二つの被結合部材に打ち込んだ。On the other hand, a conventional straight nail having a uniform thickness with a total length of 126 mm and a diameter of 4.6 mm was driven into two members to be joined in the same manner as shown in FIG.

【００２１】そして、双方とも数日間放置した後、二つ
の被結合部材ｗ１、ｗ２を釘の長手方向へ引っ張り、釘
の抜け出す瞬間の荷重を比較した。After both were left for several days, the two members to be joined w1 and w2 were pulled in the longitudinal direction of the nail, and the loads at the moment when the nail came out were compared.

【００２２】その結果は、本発明釘の方が常に大きな荷
重となったのであり、また双方の差が最も大きいもので
は、従来釘の荷重指数を１００とすると、本発明釘のそ
れは１７７であった。As a result, the load of the nail of the present invention was always larger, and when the difference between the two was the largest, the load index of the conventional nail was 100 and that of the nail of the present invention was 177. It was

【００２３】なお、上記のように結合された二つの被結
合部材ｗ１、ｗ２を釘の剪断方向へずらすようにした場
合の対抗性についても確認したところ、やはり本発明釘
の方が従来釘によるものよりも明確に大となった。When the two members to be joined w1 and w2 joined as described above were displaced in the shearing direction of the nail, the resistance against them was also confirmed. It was definitely bigger than the one.

【００２４】本実験に使用された本発明釘は傾斜状の部
分３ａを有するため、比較に使用された従来釘よりも材
料が少なく軽いものとなるのであり、測定結果では従来
釘の重量が凡そ１５ｇであるのに対し、本発明釘は凡そ
１３．５ｇであった。Since the nail of the present invention used in this experiment has the slanted portion 3a, the amount of the material is smaller and lighter than that of the conventional nail used for comparison. The measurement result shows that the weight of the conventional nail is approximately the same. The weight of the nail of the present invention was about 13.5 g, while the weight was 15 g.

【００２５】次に、本発明釘の製造方法の一例を説明す
る。先ず、図４に示すようにコイル状に巻き取られた鋼
線材（材質ＳＷＲＭ）ｓの移送経路上に、ストレートナ
４、送り装置５、クランプ６、成形型であるダイス７及
び、カッタ８をこの順に配設する。Next, an example of the method for manufacturing the nail of the present invention will be described. First, as shown in FIG. 4, a straightener 4, a feeding device 5, a clamp 6, a die 7 as a molding die, and a cutter 8 are provided on a transfer path of a steel wire material (material SWRM) s wound into a coil shape. Arrange in this order.

【００２６】ここに、ストレートナ４は鋼線材ｓの曲が
りを除去するものであり、送り装置５は鋼線材ｓを適時
に適当寸法だけ送るものであり、クランプ６は鋼線材ｓ
の移動を規制するものであり、ダイス７は釘の先鋭部２
を除いた部分を成形するものであり、カッタ８は半成形
された鋼線材ｓを切断すると同時に先鋭部２を角錐状に
成形するものである。Here, the straightener 4 is for removing the bending of the steel wire rod s, the feeding device 5 is for feeding the steel wire rod s by an appropriate size at a proper time, and the clamp 6 is the steel wire rod s.
The die 7 is used to regulate the movement of the nail and the sharp tip 2 of the nail.
The cutter 8 is for cutting the semi-formed steel wire rod s and, at the same time, for forming the pointed portion 2 into a pyramid shape.

【００２７】しかして、上記ダイス７は頭部成形面９、
傾斜状部成形面１０及び、一様太さの直状部成形面１１
を具備し、且つこれらの面の開放を可能となすべく複数
に分割されたものとなされている。このさい、頭部成形
面９と傾斜状部成形面１０との間には図５に示すように
極短い（凡そ５〜８ｍｍ程度）範囲で傾斜状部成形面１
０の最小直径と同一の一様太さの直状部成形面１２を設
けるのであり、この直状部成形面１２には滑止め用の小
さな凹凸１３を設ける。Thus, the die 7 has a head molding surface 9,
Inclined portion molding surface 10 and straight portion molding surface 11 of uniform thickness
And is divided into a plurality of parts so that these surfaces can be opened. At this time, between the head molding surface 9 and the inclined portion molding surface 10, as shown in FIG. 5, the inclined portion molding surface 1 is in an extremely short range (about 5 to 8 mm).
The straight-portion molding surface 12 having the same uniform thickness as the minimum diameter of 0 is provided, and the straight-portion molding surface 12 is provided with small irregularities 13 for preventing slippage.

【００２８】また、鋼線材ｓの移送経路の延長線上には
比較的小さなパンチ１４を設け、これの背後には、これ
よりも大きなパンチ１５を前記移送経路に沿った方向の
移動可能に、しかも特定位置の打撃可能に設ける。Further, a relatively small punch 14 is provided on the extension of the transfer path of the steel wire rod s, and a punch 15 larger than this is provided behind this so as to be movable in the direction along the transfer path. It is designed to be able to hit a specific position.

【００２９】斯かる製造装置により、本発明釘は次のよ
うに自動的に製造される。即ち、送り装置５が図４に示
すように鋼線材ｓの先部分を、開放状態となされたダイ
ス７の内方へ送り込み、鋼線材ｓの先端がダイス７の頭
部成形面９より適当寸法だけ突出した状態で停止するよ
うに作動する。The nail of the present invention is automatically manufactured by the manufacturing apparatus as follows. That is, as shown in FIG. 4, the feeding device 5 feeds the tip portion of the steel wire rod s into the inside of the die 7 which is in an open state, and the tip of the steel wire rod s has an appropriate dimension from the head forming surface 9 of the die 7. It works so as to stop only in the protruding state.

【００３０】これに関連してクランプ６が鋼線材ｓを把
握してその位置を固定化すると共に、図４の位置に在る
ダイス７が閉鎖状態となってその直状部成形面１２で鋼
線材ｓを強力に把握する。In this connection, the clamp 6 grasps the steel wire rod s and fixes its position, and the die 7 at the position shown in FIG. Strongly grasp the wire s.

【００３１】続いて、図６Ａに示すようにパンチ１４が
鋼線材ｓの先端を打撃して頭部成形面９に押しつけるも
のとなり、これにより鋼線材ｓは頭部成形面９により釘
の頭部１となるように成形される。Subsequently, as shown in FIG. 6A, the punch 14 hits the tip of the steel wire rod s and presses it against the head forming surface 9, whereby the steel wire rod s is pressed by the head forming surface 9 to the head of the nail. It is molded so that it becomes 1.

【００３２】続いてダイス７の位置固定が解除されると
共に、図６Ｂに示すように別のパンチ１５が先のパンチ
１４の背後を打撃してクランプ６よりも先側の鋼線材ｓ
を傾斜状部成形面１０及び直状部成形面１１に押しつけ
るのであり、これにより鋼線材ｓは傾斜状部成形面１０
及び直状部成形面１１により釘の傾斜状の部分３ａ及び
一様太さ部３ｂとなるように成形される。Subsequently, the position fixing of the die 7 is released, and as shown in FIG. 6B, another punch 15 hits the back of the previous punch 14 to strike the steel wire s ahead of the clamp 6.
Is pressed against the inclined portion forming surface 10 and the straight portion forming surface 11, whereby the steel wire rod s forms the inclined portion forming surface 10
And the straight portion molding surface 11 is molded to form the inclined portion 3a and the uniform thickness portion 3b of the nail.

【００３３】続いてクランプ６の把握が解放され且つダ
イス７が開放され且つ二つのパンチ１４、１５が背後側
へ移動された状態となり、その後、送り装置５が鋼線材
ｓを釘の長さに関連した一定長さだけ送った後、クラン
プ６及びダイス７が閉鎖作動して鋼線材ｓを把握し固定
状態とする。Subsequently, the grip of the clamp 6 is released, the die 7 is opened, and the two punches 14 and 15 are moved to the rear side, after which the feeding device 5 moves the steel wire s to the length of the nail. After feeding the relevant fixed length, the clamp 6 and the die 7 are closed to grasp and fix the steel wire rod s.

【００３４】この状態の下で、今度はカッタ８が図６Ｃ
に示すように切断作動するものとなり、これにより鋼線
材ｓの半成形部分ｓ１は特定位置ｐを切断されると同時
に釘の先鋭部２となるように成形されるのであり、かく
して成形された本発明釘は下方に落下するものとなる。Under this condition, the cutter 8 is shown in FIG. 6C.
The cutting operation is performed as shown in Fig. 3, whereby the semi-formed portion s1 of the steel wire rod s is formed so as to become the sharpened portion 2 of the nail at the same time when the specific position p is cut. The invention nail will fall downward.

【００３５】この後は上記した作動及び処理が繰り返さ
れるのであり、このさい図６Ｂに示す成形処理中におい
て圧縮により生成された膨大部ｓ２が、図６Ｄに示すよ
うに鋼線材ｓの先端に存在するものとなるが、この膨大
部ｓ２は釘の頭部１の形状に近似する傾向となるため頭
部１の成形にとって却って都合のよいものとなる。After that, the above-mentioned operation and processing are repeated, and the enlarged portion s2 generated by compression during the forming processing shown in FIG. 6B is present at the tip of the steel wire rod s as shown in FIG. 6D. However, since the enlarged portion s2 tends to approximate the shape of the head 1 of the nail, it is rather convenient for forming the head 1.

【００３６】上記した製造方法では釘の頭部１と傾斜状
の部分３ａとが同一のダイス７で成形できるため能率的
かつ経済的であるが、これに限定するものではなく、例
えば先ず頭部１のみを単独のダイス７で成形し、さらに
別のダイスで傾斜状の部分などを成形するように処理し
ても何等差し支えない。In the above-mentioned manufacturing method, the nail head 1 and the inclined portion 3a can be formed by the same die 7, which is efficient and economical, but the present invention is not limited to this. There is no problem even if only 1 is molded with a single die 7, and another die is used to mold an inclined portion or the like.

【００３７】なお、全図において説明の都合上、釘の形
状やダイスの成形面などの特徴的部分は誇張的に表現し
てある。For convenience of explanation, characteristic features such as the shape of the nail and the molding surface of the die are exaggerated in all the drawings.

【００３８】[0038]

【発明の効果】上記の如く構成した本発明によれば、従
来のものと比べ少ない材料でありながら、従来のものよ
りも、被結合部材（木材などの弾性的性質を有するも
の）からの抜け出しに対し、一層大きな抵抗力を発揮で
きるものとなり、釘による結合構造を経済的かつ強力な
ものとなし得るのである。EFFECTS OF THE INVENTION According to the present invention configured as described above, although the material is less than that of the conventional one, it is more likely to escape from the coupled member (those having elastic properties such as wood) than the conventional one. On the other hand, a greater resistance can be exerted, and the nailed joint structure can be made economical and strong.

【００３９】具体的には、従来釘を大幅に上回る抜け出
し抵抗性を有する釘を例えば凡そ１０％程度少ない重量
の材料で得ることができ、またこれに関連して製造処理
費も減じるため、全体的な製造コストは例えば凡そ１０
％程度減じるものとなる。Specifically, a nail having a pull-out resistance that is significantly higher than that of a conventional nail can be obtained from a material having a weight that is, for example, about 10% less, and the manufacturing processing cost is also reduced in connection with this, so that the entire nail is reduced. Typical manufacturing cost is about 10
It will be reduced by about%.

【００４０】また胴部の傾斜状の部分が頭部へ向けて細
くなるため小さい打ち込み力で足りるのであり、さらに
はこの効用に加え釘重量が小さいことの関連から、作業
者の労力も減じるのである。Further, since the slanted portion of the torso portion becomes thinner toward the head, a small driving force is sufficient, and in addition to this effect, the weight of the nail is small, so the labor of the worker is also reduced. is there.

【００４１】請求項４又は５に記載の方法によれば、加
工中に釘材料が鍛えられて釘の強度が向上するものとな
る上に、釘の頭部と胴部が連続的に成形できるため能率
的な製造が行えるのである。According to the method of claim 4 or 5, the nail material is forged during processing to improve the strength of the nail, and the head and the body of the nail can be continuously formed. Therefore, efficient manufacturing can be performed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係る釘の一実施例を示し、Ａは正面
図、Ｂは左側面図、そしてＣは右側面図である。FIG. 1 shows an embodiment of a nail according to the present invention, where A is a front view, B is a left side view, and C is a right side view.

【図２】同実施例の釘の一部の断面を示す拡大図であ
る。FIG. 2 is an enlarged view showing a cross section of a part of the nail according to the embodiment.

【図３】上記釘の実験の状態を示す図である。FIG. 3 is a diagram showing an experimental state of the nail.

【図４】同実施例の釘の製造例を示す図である。FIG. 4 is a view showing an example of manufacturing the nail according to the embodiment.

【図５】同製造例に使用されるダイスの一部を示す拡大
断面図である。FIG. 5 is an enlarged cross-sectional view showing a part of a die used in the manufacturing example.

【図６】同製法に使用されるダイス周辺の作動を示す説
明図である。FIG. 6 is an explanatory view showing an operation around a die used in the manufacturing method.

【符号の説明】[Explanation of symbols]

１ 頭部 ２ 先鋭部 ３ 胴部 ３ｂ 一様太さ部 ７ 成形型 ９ 頭部成形面 １０ 傾斜状部成形面 ｓ 鋼線材 DESCRIPTION OF SYMBOLS 1 Head 2 Sharpened part 3 Body 3b Uniform thickness part 7 Mold 9 Head molding surface 10 Inclined part molding surface s Steel wire rod

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 胴部の凡そ半分長さ以上の範囲を頭部側
から先鋭部側へ向けて漸次太くなるような傾斜状に形成
した構成を特徴とする釘。1. A nail characterized in that a range of approximately half the length of the body or more is formed in an inclined shape such that it gradually thickens from the head side to the sharpened side. 【請求項２】 傾斜状に形成した部分よりも先鋭部側の
胴部に同部分の先鋭部側の端部の直径と同一の直径の一
様太さ部を形成したことを特徴とする請求項１記載の
釘。2. A uniform thickness portion having the same diameter as the diameter of the end portion on the sharpened portion side of the portion is formed on the barrel portion on the sharpened portion side of the inclined portion. The nail according to Item 1. 【請求項３】 傾斜状に形成した部分よりも頭部側の胴
部の比較的短い範囲に同部分の頭部側の端部の直径と同
一の直径の一様太さ部を形成したことを特徴とする請求
項１又は２記載の釘。3. A uniform thickness portion having the same diameter as the diameter of the end portion on the head side of the portion is formed in a relatively short range of the body portion on the head side of the inclined portion. The nail according to claim 1 or 2, characterized in that. 【請求項４】 釘の胴部の凡そ半分長さ以上の範囲とな
される鋼線材部分を、冷間鍛造により、頭部側から先鋭
部側へ向けて漸次太くなるような傾斜状に成形すること
を特徴とする釘の製造方法。4. A steel wire rod portion having a length of approximately half the length of the body portion of the nail or more is formed by cold forging into an inclined shape that gradually becomes thicker from the head side to the sharpened side. A method for manufacturing a nail, characterized in that 【請求項５】 頭部成形面及び傾斜状部形成面を具備し
た成形型を用い、鋼線材を頭部成形面及び傾斜状部形成
面の内方に押し込むように実施することを特徴とする請
求項４記載の釘の製造方法。5. A forming die having a head forming surface and an inclined portion forming surface is used, and a steel wire rod is pushed inward of the head forming surface and the inclined portion forming surface. The method for manufacturing a nail according to claim 4. 【請求項６】 釘の胴部の凡そ半分長さ以上の範囲を頭
部側から先鋭部側へ向けて漸次太くなるような傾斜状に
形成するための傾斜状部成形面を具備せしめたことを特
徴とする釘の成形型。6. A sloped portion forming surface for forming a sloped portion that gradually thickens from the head side toward the sharpened side in a range of approximately half the length or more of the body of the nail. Mold for nails.