JPH0596424A - Manufacture of short size drill - Google Patents
Manufacture of short size drillInfo
- Publication number
- JPH0596424A JPH0596424A JP28224291A JP28224291A JPH0596424A JP H0596424 A JPH0596424 A JP H0596424A JP 28224291 A JP28224291 A JP 28224291A JP 28224291 A JP28224291 A JP 28224291A JP H0596424 A JPH0596424 A JP H0596424A
- Authority
- JP
- Japan
- Prior art keywords
- drill
- short
- manufacturing
- shank
- collar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ドリル部とこれに続く
支持軸部が短い短寸ドリルの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a short drill having a short drill shaft and a supporting shaft portion following the drill member.
【０００２】[0002]
【従来の技術】この種の短寸ドリルの製造方法につい
て、本願発明者は既に、特開平１−２７４９３０号にお
いて、ドリル刃先を再研磨することなく使い捨てにして
も経済的な短寸ドリルの製造方法を提案し（特に、同公
報第３図参照）、また、特開平２−１９７３４７号（特
公平３−１７５７５号）において、セルフドリリング・
ブラインド・リベットのマンドレル先端に接合するドリ
ルチップの製造方法を提案している。2. Description of the Related Art Regarding the method of manufacturing a short drill of this type, the inventor of the present invention has already disclosed in Japanese Patent Laid-Open No. 1-274930 a method of manufacturing a short drill that is economical even if it is thrown away without regrinding the drill cutting edge. A method has been proposed (see, in particular, FIG. 3 of the same publication), and in Japanese Patent Laid-Open No. 2-197347 (Japanese Patent Publication No. 3-17575), self-drilling
We propose a method of manufacturing a drill tip that is joined to the mandrel tip of a blind rivet.
【０００３】上述した短寸ドリルの製造方法はいずれ
も、冷間鍛造によるものであり、ブランクの自動給送及
びドリル部成形時の位置決め保持のためシャンクの一端
に鍔部を設け、他端部にドリル部を成形するようにして
いる。そして、ドリル部を成形した後、前記鍔部を転造
加工によりもみ潰して除去している。All of the above-mentioned methods for manufacturing short drills are carried out by cold forging. A collar is provided at one end of the shank and an other end is provided for automatic feeding of blanks and positioning and holding when forming the drill. It is designed to form the drill part. Then, after forming the drill portion, the collar portion is crushed and removed by rolling.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前記鍔部を転
造加工により除去するには、特殊な転造ダイスを必要と
するばかりではなく、転造加工するためにドリル部に続
く支持軸部をに長くしなければならず、必然的に全体が
長くなる。しかも、前記鍔部を除去する応力を最小限に
するため、前記鍔部の厚み、径及び前記シャンクの軸線
に対する偏芯量を極力小さくする必要があり、その加工
が困難であった。However, in order to remove the collar portion by rolling, not only a special rolling die is required, but also the supporting shaft portion following the drill portion for rolling processing. Has to be long, and inevitably the whole is long. Moreover, in order to minimize the stress for removing the collar portion, it is necessary to minimize the thickness and diameter of the collar portion and the amount of eccentricity of the shank with respect to the axis line, which is difficult to process.
【０００５】また、特開平２−１９７３４７号（特公平
３−１７５７５号）におけるドリルチップのような場合
には、前記鍔部を除去するだけではなく、マンドレルに
接合するため端部を軸線に対して直角をなす接合面に修
正加工する必要がある。Further, in the case of a drill tip as disclosed in Japanese Patent Laid-Open No. 2-197347 (Japanese Patent Publication No. 3-17575), not only is the collar portion removed, but the end portion is joined to the mandrel with respect to the axis. It is necessary to correct the joint surface to form a right angle.
【０００６】本発明は上記事情に鑑みなされたもので、
上記した従来の製造方法を改善して、短寸ドリルをより
安価に、かつ能率良く量産できる短寸ドリルの製造方法
を提供することを目的とする。The present invention has been made in view of the above circumstances.
It is an object of the present invention to provide a method for manufacturing a short length drill by improving the above-mentioned conventional manufacturing method so that the short length drill can be mass-produced more inexpensively and efficiently.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、一端に鍔部を設けたシャンクに冷間鍛造
によりドリル部を成形する短寸ドリルの製造方法であっ
て、前記ドリル部をその先端切刃が前記鍔部に対向する
ように成形し、前記ドリル部の成形時に生じるスクラッ
プと一緒に前記鍔部を除去することを特徴とする。In order to achieve the above object, the present invention is a method for manufacturing a short drill comprising forming a drill portion by cold forging on a shank having a collar portion at one end thereof. It is characterized in that the drill part is formed so that its tip cutting edge faces the flange part, and the flange part is removed together with scraps generated during the forming of the drill part.
【０００８】[0008]
【作用】上記構成により、シャンクの一端に設けられた
鍔部は、ドリル部の成形時に生じるスクラップと一緒に
除去される。一方、前記ドリル部に続く支持軸部は、成
形加工の影響を受けないので、前記シャンクの一端に前
記鍔部を加工する際、予め前記支持軸部の長さ、直径を
設定し、あるいは端面加工などを施すことが可能であ
る。With the above construction, the collar portion provided at one end of the shank is removed together with the scrap generated during the forming of the drill portion. On the other hand, since the support shaft portion following the drill portion is not affected by the molding process, when processing the collar portion at one end of the shank, the length and diameter of the support shaft portion are set in advance, or the end surface is set. It can be processed.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１は、本発明方法による短寸ドリルの製
造工程を示している。図１（ａ）に示すブランク１は、
ドリル径より若干細径のシャンク２の上端に鍔部３を一
体に形成したもので、通常、低炭素鋼により製作する。
鍔部３は、後述するドリル部４の冷間鍛造の各工程を自
動化する際、その搬送及び位置決めに供するために設け
られるものである。FIG. 1 shows a manufacturing process of a short drill according to the method of the present invention. The blank 1 shown in FIG.
The shank 2 having a diameter slightly smaller than the diameter of the drill is integrally formed with the collar portion 3 and is usually made of low carbon steel.
The collar part 3 is provided for carrying and positioning when automating each step of cold forging of the drill part 4 described later.
【００１１】図１（ｂ）は、ドリル部４の成形工程を示
している。該ドリル部４は、図２及び図３に示す１対の
加工金型２１Ａ，２１Ｂでシャンク２を挟み付けるよう
にして冷間鍛造される。その際、両金型２１Ａ，２１Ｂ
に刻設した凹凸形状（後述する）をシャンク２に圧印し
てドリル部４が形成されると同時に、余肉がはみ出し、
ドリル部４の外側縁に沿ってスクラップ１０が生じる。FIG. 1B shows a forming process of the drill portion 4. The drill portion 4 is cold forged so that the shank 2 is sandwiched between a pair of working dies 21A and 21B shown in FIGS. At that time, both molds 21A, 21B
An uneven shape (described later) engraved on the shank 2 is imprinted on the shank 2 to form the drill portion 4 and, at the same time, the excess thickness protrudes,
Scrap 10 occurs along the outer edge of the drill section 4.
【００１２】ドリル部４を成形する加工金型２１Ａ，２
１Ｂは、図２及び図３に示すように同一形状を備えてい
る。両金型２１Ａ，２１Ｂはそれぞれ対向面に互いに平
行する段差を設けた２つの基準平面２２，２３を有し、
ドリル部４のランド５を成形する凹部２４は平面２２を
基準面として刻設され、縦溝（切屑排出溝）６を成形す
る突部２５は平面２３を基準面として形成されている。
そして、一方の先端切刃７ａを画定する端縁２６ａと、
一方の側縁切刃８ａを画定する端縁２７ａが平面２２上
に位置すると共に、他方の先端切刃７ｂ及び側縁切刃８
ｂを画定する端縁２６ｂ，２７ｂが平面２３上に位置
し、端縁２６ａ，２６ｂの上端を連結する稜線部分によ
ってチゼルエッジ９を成形する端縁２８が形成されてい
る。Processing dies 21A, 2 for forming the drill portion 4
1B has the same shape as shown in FIGS. 2 and 3. Both molds 21A and 21B have two reference planes 22 and 23 provided with steps parallel to each other on the opposite surfaces,
The recess 24 for forming the land 5 of the drill portion 4 is engraved with the flat surface 22 as a reference surface, and the projection 25 for forming the vertical groove (chip discharge groove) 6 is formed with the flat surface 23 as a reference surface.
And an edge 26a that defines one tip cutting edge 7a,
The edge 27a that defines one side edge cutting edge 8a is located on the plane 22, and the other tip cutting edge 7b and side edge cutting edge 8 are provided.
Edges 26b and 27b that define b are located on the plane 23, and an edge 28 that forms the chisel edge 9 is formed by a ridge portion that connects the upper ends of the edges 26a and 26b.
【００１３】上記構成を有する加工金型２１Ａ，２１Ｂ
を用いてドリル部４を成形するには、図２に示すよう
に、給送円盤３０の孔３１にシャンク２を挿通し、鍔部
３を給送円盤３０に係止させて搬送されてくるブランク
１を両金型２１Ａ，２１Ｂの間に位置決めしたのち、鍔
部３を図示しないばねで矢印の方向に加圧されている保
持ピン３２で押圧した状態で、両金型２１Ａ，２１Ｂに
よりシャンク２を挟み付けるようにしてドリル部４を冷
間鍛造する。このようにして成形されたドリル部４は、
図１（ｂ）に示すように、ドリル部４の先端切刃７ａ，
７ｂ及びチゼルエッジ９が鍔部３に対向し、かつドリル
部４の外側縁に沿って生じるスクラップ１０が鍔部３と
一体となっている。一方、鍔部３の反対側でドリル部４
が成形されないシャンク部分によりドリル部４の支持軸
部２ａが形成される。続いて、スクラップ１０を除去す
ると、これと一体をなす鍔部３が一緒に除去され、図１
（ｃ）に示す短寸ドリル１１が得られる。この短寸ドリ
ル１１は、浸炭焼入れにより表面を硬化させて完成品と
なる。Processing dies 21A and 21B having the above structure
2, the shank 2 is inserted into the hole 31 of the feeding disc 30 and the collar portion 3 is engaged with the feeding disc 30 to be conveyed as shown in FIG. After the blank 1 is positioned between the molds 21A and 21B, the collar 3 is pressed by the holding pin 32 which is pressed in the direction of the arrow by a spring (not shown), and the shank is pressed by the molds 21A and 21B. Cold forging the drill part 4 so that 2 is sandwiched. The drill portion 4 formed in this way is
As shown in FIG. 1B, the tip cutting edge 7a of the drill portion 4,
7b and the chisel edge 9 face the collar portion 3, and scrap 10 generated along the outer edge of the drill portion 4 is integrated with the collar portion 3. On the other hand, on the opposite side of the collar part 3, the drill part 4
The support shaft portion 2a of the drill portion 4 is formed by the shank portion in which is not formed. Subsequently, when the scrap 10 is removed, the collar portion 3 which is integral with the scrap 10 is also removed, and
The short drill 11 shown in (c) is obtained. The short drill 11 has a surface hardened by carburizing and quenching to become a finished product.
【００１４】上述した本発明方法によりドリル部４を成
形すると、該ドリル部４に続く支持軸部２ａは、成形加
工の影響をほとんど受けないので、図４ないし６に示す
ように、ブランク１のヘッダー加工と同時に、予め支持
軸部２ａに種々の加工を行なうことが可能である。When the drill portion 4 is formed by the above-described method of the present invention, the support shaft portion 2a following the drill portion 4 is hardly affected by the forming process, and therefore, as shown in FIGS. At the same time as the header processing, it is possible to perform various processing on the support shaft portion 2a in advance.
【００１５】図４は、支持軸部２ａを予め細径に加工し
ておき、成形したドリル部４のドリル径に比べて支持軸
部２ａが相当量小径の短寸ドリル１１としたものであ
る。In FIG. 4, the support shaft portion 2a is processed into a small diameter in advance, and the support shaft portion 2a is a short drill 11 having a diameter considerably smaller than the drill diameter of the formed drill portion 4. ..
【００１６】図５は、ブランク１の加工時に、支持軸部
２ａの端面に凹部１２を設けると共に、端部外周面にテ
ーパ部１３を加工しておき、他の部材への接合あるいは
嵌合を容易ならしめた短寸ドリル１１としたものであ
る。In FIG. 5, when the blank 1 is processed, a recess 12 is provided on the end surface of the support shaft portion 2a, and a taper portion 13 is processed on the outer peripheral surface of the end portion so as to be joined or fitted to another member. This is a short drill 11 that is easily made.
【００１７】また、図６は、シャンク２のドリル部４を
成形する軸部と、ドリル部４を成形しない支持軸部２ａ
との境界に環状溝１４を加工したのち、ドリル部４を成
形したものである。このように環状溝１４を設けておく
と、ドリル部４を成形したのち、スクラップ１０を除去
する際、図１（ｃ）に仮想線で示すように、側縁刃８
ａ，８ｂの終端に残るおそれがあるばり１０ａを有効に
なくすことができる。また、ばり１４が僅かに残っても
環状溝１４内に保留され、ドリル部４の機能に影響を及
ぼすおそれがない。Further, FIG. 6 shows a shaft portion forming the drill portion 4 of the shank 2 and a support shaft portion 2a not forming the drill portion 4.
The drilled portion 4 is formed after processing the annular groove 14 at the boundary with the. By providing the annular groove 14 in this way, when the scrap 10 is removed after the drill portion 4 is formed, the side edge blade 8 is formed as shown by an imaginary line in FIG.
It is possible to effectively eliminate the flash 10a that may remain at the ends of a and 8b. Further, even if the flash 14 is slightly left, it is retained in the annular groove 14 and there is no fear of affecting the function of the drill portion 4.
【００１８】[0018]
【発明の効果】以上説明したように、本発明方法によれ
ば、シャンクの一端に設けた鍔部が、ドリル部の成形時
に生じるスクラップと一緒に除去されるので、従来のよ
うに前記鍔部を除去するための別工程が不要であり、し
かも、前記ドリル部に続く支持軸部は任意の長さに短く
設定することが可能であるから、所望長さの短寸ドリル
が安価に量産できる。As described above, according to the method of the present invention, the collar portion provided at one end of the shank is removed together with the scrap generated during the forming of the drill portion, so that the conventional collar portion is removed. Since a separate step for removing the above is unnecessary and the support shaft portion following the drill portion can be set to a short length to an arbitrary length, a short drill of a desired length can be mass-produced at low cost. ..
【００１９】また、ドリル部を成形しない前記支持軸部
は、成形加工の影響をほとんど受けないので、ブランク
の加工と同時に、予め所望の径、長さに設定し、また端
面あるいは外周面の加工を施すことが可能となり、用途
に合わせて種々の加工を施した支持軸部を有する短寸ド
リルが容易に得られるという格別の効果がある。Further, since the supporting shaft portion which does not form the drill portion is hardly affected by the forming process, the desired diameter and length are set in advance at the same time as the blank process, and the end face or the outer peripheral face is processed. It is possible to provide a special effect that a short drill having a supporting shaft portion that has been variously processed according to the application can be easily obtained.
【図１】本発明方法による短寸ドリルの製造工程を示す
説明図である。FIG. 1 is an explanatory view showing a manufacturing process of a short drill according to the method of the present invention.
【図２】ドリル部を冷却鍛造する加工金型の正面図であ
る。FIG. 2 is a front view of a working die for cooling and forging a drill portion.
【図３】相対する１組の加工金型の平面図である。FIG. 3 is a plan view of a pair of opposing processing dies.
【図４】ないしFIG. 4
【図６】それぞれ支持軸部の形状が異なる短寸ドリルの
製造工程を示す説明図である。FIG. 6 is an explanatory diagram showing a manufacturing process of short drills in which the shapes of the supporting shaft portions are different from each other.
１ ブランク ２ シャンク ２ａ 支持軸部 ３ 鍔部 ４ ドリル部 ７ａ，７ｂ 先端切刃 １０ スクラップ １１ 短寸ドリル 1 Blank 2 Shank 2a Support shaft part 3 Collar part 4 Drill part 7a, 7b Tip cutting edge 10 Scrap 11 Short drill
Claims (4)
によりドリル部を成形する短寸ドリルの製造方法であっ
て、 前記ドリル部をその先端切刃が前記鍔部に対向するよう
に成形し、 前記ドリル部の成形時に生じるスクラップと一緒に前記
鍔部を除去することを特徴とする短寸ドリルの製造方
法。1. A method of manufacturing a short drill in which a shank having a collar portion at one end thereof is formed with a drill portion by cold forging, wherein the tip of the drill portion faces the collar portion. A method for manufacturing a short-sized drill, which comprises molding and removing the collar portion together with scraps generated during molding of the drill portion.
持軸部が、予めドリル部を成形する軸部より細径に形成
されている請求項１記載の短寸ドリルの製造方法。2. The method for manufacturing a short drill according to claim 1, wherein the support shaft portion that does not form the drill portion of the shank is formed to have a smaller diameter than the shaft portion that forms the drill portion in advance.
持軸部の端面に予め加工を施す請求項１又は請求項２記
載の短寸ドリルの製造方法。3. The method for manufacturing a short drill according to claim 1, wherein the end surface of the support shaft portion that does not form the drill portion of the shank is preliminarily machined.
とドリル部を成形しない支持軸部との境界に、予め環状
溝が形成されている請求項１記載の短寸ドリルの製造方
法。4. The method for manufacturing a short drill according to claim 1, wherein an annular groove is formed in advance at a boundary between the shaft portion forming the drill portion of the shank and the support shaft portion not forming the drill portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28224291A JPH0596424A (en) | 1991-10-01 | 1991-10-01 | Manufacture of short size drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28224291A JPH0596424A (en) | 1991-10-01 | 1991-10-01 | Manufacture of short size drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0596424A true JPH0596424A (en) | 1993-04-20 |
Family
ID=17649909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28224291A Pending JPH0596424A (en) | 1991-10-01 | 1991-10-01 | Manufacture of short size drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0596424A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130200060A1 (en) * | 2010-08-23 | 2013-08-08 | Toyota Jidosha Kabushiki Kaisha | Electric heating catalyst |
| JP2014083680A (en) * | 2012-10-19 | 2014-05-12 | Adolf Wuerth Gmbh & Co Kg | Method for manufacturing drill tip and pair of holding jaws |
| US9121322B2 (en) | 2010-08-31 | 2015-09-01 | Toyota Jidosha Kabushiki Kaisha | Electrically heated catalyst |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01274930A (en) * | 1988-04-26 | 1989-11-02 | Matsuyama Seisakusho:Kk | Manufacture of drill |
-
1991
- 1991-10-01 JP JP28224291A patent/JPH0596424A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01274930A (en) * | 1988-04-26 | 1989-11-02 | Matsuyama Seisakusho:Kk | Manufacture of drill |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130200060A1 (en) * | 2010-08-23 | 2013-08-08 | Toyota Jidosha Kabushiki Kaisha | Electric heating catalyst |
| US9131535B2 (en) * | 2010-08-23 | 2015-09-08 | Toyota Jidosha Kabushiki Kaisha | Electric heating catalyst |
| US9121322B2 (en) | 2010-08-31 | 2015-09-01 | Toyota Jidosha Kabushiki Kaisha | Electrically heated catalyst |
| JP2014083680A (en) * | 2012-10-19 | 2014-05-12 | Adolf Wuerth Gmbh & Co Kg | Method for manufacturing drill tip and pair of holding jaws |
| US9347479B2 (en) | 2012-10-19 | 2016-05-24 | Würth International Ag | Method and pair of pinching jaws for producing a drilling tip |
| TWI586451B (en) * | 2012-10-19 | 2017-06-11 | 福士國際公司 | Method and pair of pinching jaws for producing a drilling tip |
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