JPS61282613A - Drill screw - Google Patents
Drill screwInfo
- Publication number
- JPS61282613A JPS61282613A JP2590385A JP2590385A JPS61282613A JP S61282613 A JPS61282613 A JP S61282613A JP 2590385 A JP2590385 A JP 2590385A JP 2590385 A JP2590385 A JP 2590385A JP S61282613 A JPS61282613 A JP S61282613A
- Authority
- JP
- Japan
- Prior art keywords
- longitudinal axis
- drill
- chisel edge
- shank
- end surfaces
- 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.)
- Granted
Links
- 238000005520 cutting process Methods 0.000 claims description 35
- 238000005242 forging Methods 0.000 claims description 11
- 210000003128 head Anatomy 0.000 description 11
- 210000000887 face Anatomy 0.000 description 8
- 210000001747 pupil Anatomy 0.000 description 5
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
- F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0084—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by geometric details of the tip
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Drilling Tools (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、被締結物にねじ下孔を穿設するためのドリル
部を一体的に備えたドリルねしに関し、特に、前記ドリ
ル部をピンチポインティング等の鍛造によって成形した
ドリルねじの改良に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drill bit that is integrally equipped with a drill part for drilling a pilot hole in a fastened object, and particularly relates to a drill bit that is integrally equipped with a drill part for drilling a pilot hole in a fastened object. This invention relates to the improvement of drill screws formed by forging such as pinch pointing.
最近この種のドリルねしにおいては、その需要の増大に
伴い当該ドリルねじの製造コストを低減する意味から、
上端に頭部を一体的に形成したねじ山付きシャンクの下
端部分におけるドリル部をピンチボインティング等の鍛
造によって成形することが行なわれており、先行技術と
しての特公昭４８−１３１３９号公報（米国特許第３３
９５６０３号）、特公昭５Ｂ−４５０４号公報及び特公
昭５９−７０４６号公報（米国特許第４４０７６２０号
）は、シャンクの下端部分に鍛造によって形成されるド
リル部を第１２図〜第１５図に示すような形状にしてい
る。Recently, with the increasing demand for this type of drill screw, in order to reduce the manufacturing cost of the drill screw,
The drill part at the lower end of a threaded shank with a head integrally formed at the upper end is formed by forging such as pinch bointing, and as a prior art, Japanese Patent Publication No. 13139/1983 (U.S. Patent No. 33
95603), Japanese Patent Publication No. 5B-4504, and Japanese Patent Publication No. 59-7046 (US Pat. No. 4,407,620), a drill portion formed by forging at the lower end portion of the shank is shown in FIGS. 12 to 15. It is shaped like this.
すなわち、前記各先行技術に開示されている鍛造成形に
よるドリル部１は、当該ドリル部１の自由終端にシャン
クの長手軸線２からシャンク上端の頭部に向って斜め上
向きで且つシャンクの長手軸線２に対して外向きに傾斜
する左右一対の傾斜端面３，３を、当該両傾斜端面３．
３がシャンクの長手軸線２に合致する位置において互い
に交差するように設けると共に、これら傾斜端面３，３
から上方に延びる２条の縦溝４．４を対角状に設け、該
両縦溝４，４を構成する２つの溝面のうち第１溝面４ａ
、４ａと前記両側斜端面３，３との各々を前記長手軸線
２を含む仮想平面５の両側において交差させることによ
り当該交差箇所に先端切刃６，６を形成し、且つ、前記
左右一対の傾斜端面３，３同志の交差稜線を、前記両先
端切刃６゜６における長手軸線２寄りの始端６ａ、６ａ
同志を結ぶ線上に位置させることによって両先端切刃６
．６における始端６ａ、６ａの間に、前記長手軸線２に
対して直角の一直線状に延びる比較的短い長さしのチゼ
ルエツジ７を形成したものであった。That is, the forged drill part 1 disclosed in each of the above-mentioned prior arts has a free end extending obliquely upward from the longitudinal axis 2 of the shank toward the head of the upper end of the shank, and the longitudinal axis 2 of the shank. A pair of left and right inclined end surfaces 3, 3 which are inclined outward with respect to the both inclined end surfaces 3.
3 are provided so as to intersect with each other at a position that coincides with the longitudinal axis 2 of the shank, and these inclined end surfaces 3, 3
Two vertical grooves 4.4 are provided diagonally extending upward from the first groove surface 4a of the two groove surfaces constituting both the vertical grooves 4, 4.
, 4a and the both side inclined end surfaces 3, 3 intersect each other on both sides of the virtual plane 5 including the longitudinal axis 2, leading cutting edges 6, 6 are formed at the intersection points, and The intersecting ridge lines of the inclined end surfaces 3, 3 are connected to the starting ends 6a, 6a near the longitudinal axis 2 of the cutting edges 6°6 at both ends.
By positioning the cutting edge 6 on the line connecting the comrades, both ends of the cutting edge 6
．． A relatively short chisel edge 7 extending in a straight line perpendicular to the longitudinal axis 2 is formed between the starting ends 6a, 6a of the longitudinal axis 6.
そして、前記のように自由終端にチゼルエツジ７を形成
したドリル部１は、例えば米国特許第３７１０６７６号
明細書に開示されているようにチゼルエツジを有せず自
由終端を尖った所謂ビンポイントに形成したドリル部に
比較して、ドリルねじを長手軸線２の回りに矢印Ａ方向
に回転しながらそのドリル部を被締結物８に押し付けた
場合に、前記チゼルエツジ７の全体が回転しながら被締
結物８に対して線接触の状態で押圧されるから、被締結
物８に対する初期の切削性能が良い利点を有する。The drill portion 1 having the chisel edge 7 formed at the free end as described above has no chisel edge and the free end is formed into a sharp so-called bin point, as disclosed in, for example, US Pat. No. 3,710,676. Compared to the drill part, when the drill part is pressed against the object 8 while rotating the drill screw around the longitudinal axis 2 in the direction of arrow A, the entire chisel edge 7 rotates and the object 8 is pressed against the object 8. Since it is pressed in line contact with the object 8, it has the advantage of good initial cutting performance on the object 8.
しかし、このチゼルエツジ７は、ドリル部の自由終端に
形成される左右一対の傾斜端面３，３の交差稜線を、前
記両切刃６，６における長手軸線２寄りの始端６ａ、６
ａ同志を結ぶ線上に位置させることによって形成したも
のであって、該チゼルエツジ７の長手方向と直角な方向
における断面の形状は、当該チゼルエツジ７の全長にわ
たって第１５図に示すにように両側斜端面３．３にて三
角形状になり、チゼルエツジ７より矢印Ａの回転方向に
対して前側の部分には、当該チゼルエツジ７から斜め上
向きに傾斜する傾斜端面３がチゼルエツジ７の全長にわ
たって存在することになる。However, this chisel edge 7 allows the intersecting ridge line of the pair of left and right inclined end surfaces 3, 3 formed at the free end of the drill part to be aligned with the starting ends 6a, 6 of the two cutting edges 6, 6 closer to the longitudinal axis 2.
The shape of the cross section in the direction perpendicular to the longitudinal direction of the chisel edge 7 is as shown in FIG. 15 over the entire length of the chisel edge 7. 3.3, the chisel edge 7 has a triangular shape, and in the front side of the chisel edge 7 in the rotational direction of arrow A, there is an inclined end surface 3 that slopes diagonally upward from the chisel edge 7 over the entire length of the chisel edge 7. .
そして、このようにチゼルエツジ７よりも回転方向の前
側位置する傾斜端面３は、チゼルエツジ△
７による切削に際して切削屑を逃がすためのすくい面と
して機能するのであるが、当該回転方向前側の傾斜端面
３は、これと被締結物８の表面８ａとの成す角度αが第
１５図に示すように当然９０度よりも遥かに小さいこと
により、すくい面として機能を充分に発揮せず、換言す
るとチゼルエツジ７の回転方向前側位置する傾斜端面３
が、切削＾
屑の縦溝４への逃げを阻害することになるから、前記チ
ゼルエツジ７による切削性能がそれだけ低いのである。In this way, the inclined end surface 3 located on the front side of the chisel edge 7 in the rotational direction functions as a rake surface for releasing cutting debris during cutting by the chisel edge Δ 7, but the inclined end surface 3 on the front side in the rotational direction , and the surface 8a of the object 8 to be fastened, as shown in FIG. Inclined end surface 3 located on the front side in the rotation direction
However, since the escape of cutting debris to the vertical groove 4 is inhibited, the cutting performance of the chisel edge 7 is correspondingly low.
つまり前記各先行技術に開示されているチゼルエツジ付
きの鍛造製ドリルねしは、被締結物に対する初期の切削
性能がまだ充分でなく、被締結物要する時間が長くかか
るのであった。In other words, the forged drill bits with chisel edges disclosed in the above-mentioned prior art still have insufficient initial cutting performance for the objects to be fastened, and it takes a long time for the objects to be fastened.
しかも、チゼルエツジ７による切削性能が低いことは、
当該チゼルエツジ７の被締結物８への食い込暑が悪る（
て、チゼルエツジ７を被締結物８に回転しながら押圧し
たときにドリル部１が長手軸線２と直角の方向に振れ動
く所謂ダンシング現象が可成り大きくなるから、被締結
物に対するドリルねじのねじ込む位置がずれ易い問題も
あった。Moreover, the cutting performance of Chisel Edge 7 is low.
The chisel edge 7 bites into the fastened object 8 poorly (
Therefore, when the chisel edge 7 is rotated and pressed against the object 8 to be fastened, the so-called dancing phenomenon in which the drill part 1 swings in a direction perpendicular to the longitudinal axis 2 becomes quite large. There was also the problem that it could easily slip off.
従って本発明は、前記先行技術のようにチゼルエツジ付
きのドリル部を鍛造によって形成したドリルねしにおい
て、そのチゼルエツジによる初期の切削性能を向上する
ことを目的とするものである。Therefore, an object of the present invention is to improve the initial cutting performance of the chisel edge in a drill bit in which the drill part with the chisel edge is formed by forging as in the prior art.
このため本発明は、外周にねじ山を形成したシャンクと
、該シャンクの上端に一体的に形成された頭部と、前記
シャンクの下端部分に鍛造により成形されたドリル部と
を備える一方、前記ドリル部には、当該ドリル部の自由
終端にシャンクの長手軸線からシャンク上端の頭部に向
って斜め上向きで且つ前記長手軸線に対して外向きに傾
斜する左右一対の傾斜端面を、当該両傾斜端面が前記長
手軸線に合致する位置において互いに交差するように設
けると共に、それぞれ第１溝面と第２溝面とで構成され
る２条の縦溝を前記両傾斜端面から上方に延びるように
設け、該両瞳溝の各々の一部を構成する第１溝面と前記
両傾斜端面との各々を前記長手軸線を含む仮想平面の両
側において交差させることにより当該側交差箇所に先端
切刃を形成し、且つ、前記左右一対の傾斜端面同志の交
差稜線を、前記画先端切刃における前記長手軸線寄りの
始端同志を結ぶ線上に位置させることによって画先端切
刃における始端の間に、チゼルエツジを形成して成るド
リルねじにおいて、前記両傾斜端面のうち前記両瞳溝に
おける第２溝面に面する部分で且つ前記チゼルエツジに
隣接する部分には、当該チゼルエツジから前記長手軸線
と略平行に延びて前記両瞳溝における第１溝面に連なる
ように構成したすくい面を形成したことを特徴するもの
である。For this reason, the present invention includes a shank having a thread formed on its outer periphery, a head integrally formed at the upper end of the shank, and a drill portion formed by forging at the lower end of the shank. The drill part has a pair of left and right inclined end surfaces, which are inclined upwardly from the longitudinal axis of the shank toward the head of the upper end of the shank and outwardly with respect to the longitudinal axis, at the free end of the drill part. The end surfaces are provided so as to intersect with each other at a position that coincides with the longitudinal axis, and two longitudinal grooves each consisting of a first groove surface and a second groove surface are provided so as to extend upward from the both inclined end surfaces. , by intersecting each of the first groove surface constituting a part of each of the both pupil grooves and the both inclined end surfaces on both sides of an imaginary plane including the longitudinal axis, a tip cutting edge is formed at the side intersection point. and forming a chisel edge between the starting ends of the image front cutting blade by locating the intersecting ridge lines of the pair of left and right inclined end faces on a line connecting the starting ends of the image front cutting blade closer to the longitudinal axis. In the drill screw, a portion of the inclined end faces facing the second groove surface in both the pupil grooves and adjacent to the chisel edge has the above-mentioned screw extending substantially parallel to the longitudinal axis from the chisel edge. It is characterized in that a rake surface is formed so as to be continuous with the first groove surface in both pupil grooves.
以下本発明の実施例を図面について説明すると、第１図
に示すドリルねじ１０は、細長いシャンク１１と、該シ
ャンク１１の上端に一体的に形成された頭部１２と、前
記シャンク１１の下端部分にピンチポインティング等の
鍛造によって成形金れたドリル部１３とから成り、前記
頭部１２には、ねじを回転させるための工具、例えばド
ライバーが係合するための溝又は凹部１４を有しくこの
場合、頭部１２は四角頭又は六角頭に形成しても良い）
、前記シャンク１１の外周面には、ａ！旋状のねじ山１
５が一体的に転造成形等の手段により形成されている。Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A drill screw 10 shown in FIG. and a drill part 13 formed by forging such as pinch pointing, and the head 12 has a groove or recess 14 for engagement with a tool for rotating the screw, such as a screwdriver. , the head 12 may be formed into a square head or a hexagonal head)
, the outer peripheral surface of the shank 11 has a! Spiral thread 1
5 is integrally formed by means such as rolling molding.
前記ドリル部１３の最大径Ｄ（詳しくは後述するように
ドリル部１３における側面に形成されるサイド切刃２５
．２５間の距離）は、前記ねじ山１５の山径よりも小さ
くねじ山１５の谷径よりも大きい寸法に構成されている
。Maximum diameter D of the drill part 13 (side cutting edge 25 formed on the side surface of the drill part 13 as described in detail later)
．． 25) is smaller than the diameter of the thread 15 and larger than the root diameter of the thread 15.
前記ドリル部１３は、従来から良く知られているように
、頭部成形後で且つねじ山成形前の素材ブランクの下端
部分を、相対向する左右一対の鍛造ダイスにより両側か
ら挟み付けることによって、ドリル部として以下に述べ
るような形状に鍛造される。As is well known in the art, the drill portion 13 is formed by sandwiching the lower end portion of the blank after the head is formed and before the thread is formed between a pair of opposing left and right forging dies from both sides. The drill part is forged into the shape described below.
そして、前記鍛造成形によるドリル部１３には、当該ド
リル部１３の自由終端に前記シャンク１１の長手軸線１
６からシャンク１１上端の頭部１２に向って斜め上向き
で且つ前記長手軸線１６に対して適宜角度θだけ外向き
に傾斜する左右一対の傾斜端面１７．１７を、当該両傾
斜端面１７，１７が前記長手軸線１６に合致する位置に
おいて互いに交差するように設けると共に、これら傾斜
端面１７，１７から上方に延びる２条の縦溝１８゜１８
を対角状に設ける。この両瞳溝１８．１８は、第１溝面
１９，１９と、当該第１溝面１９．１９に対して交差す
る第２溝面２０．２０とによって構成される。The forged drill part 13 has a longitudinal axis 1 of the shank 11 at the free end of the drill part 13.
6 toward the head 12 at the upper end of the shank 11 and a pair of left and right inclined end surfaces 17.17 which are inclined outward by an appropriate angle θ with respect to the longitudinal axis 16. Two vertical grooves 18° 18 are provided so as to intersect with each other at a position that coincides with the longitudinal axis 16, and extend upward from these inclined end surfaces 17, 17.
are provided diagonally. Both pupil grooves 18.18 are constituted by first groove surfaces 19, 19 and a second groove surface 20.20 that intersects with the first groove surfaces 19.19.
該両瞳溝１８．１８の各々の一部を構成する第１溝面１
９，１９と前記両傾斜端面１７．１７との各々を、前記
長手軸線１６を含む仮想平面２１の両側において当該仮
想平面２１と略平行な線に沿って交差させることにより
当該側交差箇所に先端切刃２２．２２を形成する。A first groove surface 1 constituting a part of each of the pupil grooves 18 and 18.
9, 19 and the both inclined end surfaces 17, 17 are intersected along lines substantially parallel to the imaginary plane 21 on both sides of the imaginary plane 21 including the longitudinal axis 16, so that the tip ends are formed at the intersecting points on the sides. A cutting edge 22.22 is formed.
そして、前記左右一対の傾斜端面１７．１７同志の交差
稜線を、前記両先端切刃２２．２２における前記長手軸
線１６寄りの始端２３．２３同志を結ぶ線上に位置させ
ることによって、両先端切刃２２．２２における始端２
３．２３の間に、前記長手軸線１６に対して直角の一直
線状に延びる比較的短い長さしのチゼルエツジ２４を形
成する。By positioning the intersecting ridge lines of the pair of left and right inclined end surfaces 17.17 on a line connecting the starting ends 23.23 of the both tip cutting edges 22.22 closer to the longitudinal axis 16, the both tip cutting edges 17. 22. Starting point 2 at 22
3.23, a relatively short length of chisel edge 24 is formed which extends in a straight line at right angles to said longitudinal axis 16.
なお、ドリル部１３における側面には、前記両縦溝１８
．１８における第１溝面１９，１９によってサイド切刃
２５．２５が、前記両先端切刃２２．２２における外周
寄りの終端２６．２６から上向きに延びるように形成さ
れている。従って、この両サイド切刃２５．２５間の距
離がドリル部１３における最大径りとなり、被締結物３
０には、この最大径りと同じ内径の孔が穿設される。ま
た、前記両縦溝１８，１８における第１溝而１９，１９
を凹曲面に形成することにより、前記両先端切刃２２．
２２及びサイド切刃２５．２５の各々に対して適宜角度
の正のすくい角を持たせるように構成され、更に、前記
両サイド切刃２５．２５の回転方向後側には、二番取り
面２７．２７が形成されている。In addition, on the side surface of the drill part 13, both vertical grooves 18 are formed.
．． A side cutting edge 25.25 is formed by the first groove surfaces 19, 19 at 18 so as to extend upward from a terminal end 26.26 of the two tip cutting edges 22.22 near the outer periphery. Therefore, the distance between the cutting edges 25 and 25 on both sides becomes the maximum diameter in the drill part 13, and the object to be fastened 3
0 is bored with a hole having the same inner diameter as this maximum diameter. Further, the first grooves 19, 19 in both the vertical grooves 18, 18
By forming a concave curved surface, the both tip cutting edges 22.
22 and side cutting blades 25.25, each of which has a positive rake angle of an appropriate angle, and furthermore, on the rear side in the rotational direction of both side cutting blades 25.25, a second chamfer is provided. 27.27 is formed.
前記ドリル部１３におけるチゼルエツジ２３を形成する
両傾斜端面１７，１７のうち、前記両縦溝１８，１８に
おける第２溝面２０．２０に面する部分で且つ前記チゼ
ルエツジ２４に隣接する部分には、チゼルエツジ２４か
ら前記長手軸線１６と略平行に延びて前記両縦溝１８．
１８における第１溝面１９，１９に連なるように構成し
た平坦なすくい面２８．２８を形成する。Of both inclined end surfaces 17, 17 forming the chisel edge 23 of the drill portion 13, a portion facing the second groove surface 20.20 of the longitudinal grooves 18, 18 and adjacent to the chisel edge 24 is provided with: Both longitudinal grooves 18. extend from the chisel edge 24 substantially parallel to the longitudinal axis 16.
A flat rake face 28.28 is formed so as to be continuous with the first groove faces 19, 19 in 18.
なお、符号２９．２９は、前記すくい面２８゜２８を形
成するために、傾斜端面１７と第２溝面２０との間に設
けた傾斜面であるが、この傾斜面２９は必ずしも必要で
ない。Incidentally, reference numeral 29.29 indicates an inclined surface provided between the inclined end surface 17 and the second groove surface 20 in order to form the rake surface 28.degree. 28, but this inclined surface 29 is not necessarily required.
この両すくい面２８．２８は、ドリル部１３を鍛造にて
成形するときにおいて、両傾斜端面１７゜１７、両縦溝
１８，１８における第１溝面１９及び第２溝面２０、及
び両二番取り面２７．２７等の成形と同時に簡単に成形
することができる。When forming the drill portion 13 by forging, these rake faces 28, 28 are formed by forming the drill portion 13 by forming the drill portion 13 by forging. It can be easily molded at the same time as molding the numbered surfaces 27, 27, etc.
このようにして成形された長手軸線１６と略平行な両す
くい面２８．２８は、ドリルねじ１ｏをその長手軸線回
りに矢印Ａ方向に回転しながらそのドリル部１３を被締
結物３０に押し付けた場合において、当該ドリル部１３
におけるチゼルエツジ２４の回転方向前側に位置する一
方、この両すくい面２８．２８は、第８図及び第９図に
示すように被締結物３０の表面３０ａに対して略垂直状
になって、チゼルエツジ２４によって切削された切削屑
を、両縦溝１８，１８に円滑に逃がすことができるので
ある。Both rake surfaces 28, 28 formed in this way, which are substantially parallel to the longitudinal axis 16, press the drill portion 13 against the object to be fastened 30 while rotating the drill screw 1o around the longitudinal axis in the direction of arrow A. In this case, the drill part 13
The rake faces 28 and 28 are located on the front side in the rotational direction of the chisel edge 24, while the rake faces 28 and 28 are substantially perpendicular to the surface 30a of the object to be fastened 30, as shown in FIGS. The chips cut by the grooves 24 can be smoothly released into both the vertical grooves 18, 18.
なお、前記第５図及び第６図に示す実施例は、前記両す
くい面２８．２８のチゼルエツジ２４の長手方向に沿う
幅寸法を、チゼルエツジ２４の長さしの丁度半分にした
場合であったが、前記両すくい面２８．２８のチゼルエ
ツジ２４の長手方向に沿う幅寸法に差を持たせて、第１
０図及び第１１図に示すように、両すくい面２８．２８
のうちいずれか一方のすくい面２８の幅寸法Ｌ１を長く
、に構成でも良い。In the embodiment shown in FIGS. 5 and 6, the width dimension of both rake faces 28, 28 along the longitudinal direction of the chisel edge 24 is exactly half the length of the chisel edge 24. However, by making a difference in the width dimension along the longitudinal direction of the chisel edge 24 of both the rake faces 28.28, the first
As shown in Fig. 0 and Fig. 11, both rake faces 28.28
The width L1 of one of the rake faces 28 may be made longer.
ハ
〔発明の作用・効果〕
以上の通り本発明のドリルねしは、鍛造によって成形さ
れるドリル部のチゼルエツジに、当該チゼルエツジによ
って切削される切削屑を縦溝に円滑に逃がすためのすく
い面を形成したもので、チゼルエツジによる初期の切削
性能が、前記各先行技術のようにチゼルエツジにすくい
面を有しないものよりも遥かに向上するから、被締結物
に′ｉｔするドリルねじのねじ込みに際しての推力を軽
減できると共に、ねじ込みに要する時間を短縮でき、且
つ、チゼルエツジの被締結物に対する食い込みが良くな
ってチゼルエツジを回転しながら被締結物に押圧した場
合のダンシング現象を低減できてねじ込む位置のずれが
少なく、軽い力で短時間で、正確な位置にねじ込みでき
る効果を有する。C [Operations and Effects of the Invention] As described above, the drill bit of the present invention has a rake face on the chisel edge of the drill portion formed by forging to smoothly release cutting waste cut by the chisel edge into the vertical groove. The initial cutting performance of the chisel edge is much improved compared to the chisel edge that does not have a rake surface as in the prior art, so the thrust force when driving the drill screw into the object to be fastened is reduced. In addition, the time required for screwing can be shortened, and the chisel edge bites into the object to be fastened better, reducing the dancing phenomenon that occurs when the chisel edge is pressed against the object while rotating, thereby reducing the deviation of the screwing position. It has the effect of being able to be screwed into an accurate position in a short time with little force.
第１図は本発明の第１の実施例ドリルねじの全体を示す
正面図、第２図は第１図の底面図、第３図は第２図の３
−３視測面図、第４図は第３図の４−４視測面図、第５
図は第１図の要部拡大図、第６図は第５図の底面図で第
２図の拡大図、第７図は第５図の７・−７視測面図、第
８図は第５図の８−８視断面図、第９図は第５図の９−
９視断面図、第１０図は本発明の第２実施例のドリル部
の拡大図、第１１は第１０図の底面図、第１２図〜第１
５図は従来の例を示すもので、第１２図はドリル部の拡
大図、第１３図は第１２図の底面図、第１４図は第１２
図の１４−１４視断面図、第１５図は第１２図の１５−
１５視断面図である。
１０・・・ドリルねし、１１・・・シャンク、１２・・
・頭部、１３・・・ドリル部、１５・・・ねじ山、１６
・・・シャンクの長手軸線、１７・・・傾斜端面、１８
・・・縦溝、１９・・・第１溝面、２０・・・第２溝面
、２１・・・仮想平面、２２・・・先端切刃、２３・・
・先端切刃の始端、２４・・・チゼルエツジ、２５・・
・サイド切刃、２６・・・先端切刃の終端、２７・・・
二番取り面、２８・・・すくい面。
手続補正書（方式）
昭和６１年 ７月 １日
特許庁長官 宇 賀 道 部 殿
１、事件の表示
特願昭６０−２５９０３号
２、発明の名称
ドリルねじ
３、補正をする者
事件と帽系 特許出唾人
住所ｑの 滋賀県野洲郡中主町大字六条
１０１８番地の１名称 ニスコ株式会社
昭和６１年６月 ４日（発送日６月２４日）６、補正の
対象
４、図面の簡単な説明FIG. 1 is a front view showing the whole drill screw according to the first embodiment of the present invention, FIG. 2 is a bottom view of FIG. 1, and FIG.
-3 Visual survey surface map, Figure 4 is the 4-4 survey surface diagram in Figure 3, and Figure 5 is
The figure is an enlarged view of the main part of Fig. 1, Fig. 6 is a bottom view of Fig. 5 and an enlarged view of Fig. 2, Fig. 7 is a 7-7 observation surface view of Fig. 5, and Fig. 8 is a bottom view of Fig. 5. 8-8 sectional view in Fig. 5, and Fig. 9 is a sectional view taken at 9-8 in Fig. 5.
9 is a cross-sectional view, FIG. 10 is an enlarged view of the drill part of the second embodiment of the present invention, FIG. 11 is a bottom view of FIG. 10, and FIGS.
Figure 5 shows a conventional example, Figure 12 is an enlarged view of the drill part, Figure 13 is a bottom view of Figure 12, and Figure 14 is an enlarged view of the drill part.
14-14 sectional view in the figure, Figure 15 is the 15-15 in Figure 12.
15 is a cross-sectional view. 10...Drill, 11...Shank, 12...
・Head, 13...Drill part, 15...Screw thread, 16
...Longitudinal axis of shank, 17 ... Inclined end surface, 18
...Vertical groove, 19...First groove surface, 20...Second groove surface, 21...Virtual plane, 22...Tip cutting edge, 23...
・Starting end of tip cutting blade, 24...Chisel edge, 25...
・Side cutting edge, 26... End of tip cutting edge, 27...
Second cut surface, 28... rake surface. Procedural amendment (method) July 1, 1985 Michibe Uga, Commissioner of the Patent Office 1, Indication of the case Patent Application No. 1988-25903 2, Name of the invention Drill screw 3, Person making the amendment and cap system Patent issuer address q: 1 name, 1018 Rokujo, Nakasu-cho, Yasu-gun, Shiga Prefecture, June 4, 1988 (Shipping date: June 24) 6, Subject of amendment 4, Brief explanation of drawings
Claims (2)
クの上端に一体的に形成された頭部と、前記シャンクの
下端部分に鍛造により成形されたドリル部とを備える一
方、前記ドリル部には、当該ドリル部の自由終端にシャ
ンクの長手軸線からシャンク上端の頭部に向って斜め上
向きで且つ前記長手軸線に対して外向きに傾斜する左右
一対の傾斜端面を、当該両傾斜端面が前記長手軸線に合
致する位置において互いに交差するように設けると共に
、それぞれ第１溝面と第２溝面とで構成される２条の縦
溝を前記両傾斜端面から上方に延びるように設け、該両
縦溝の各々の一部を構成する第１溝面と前記両傾斜端面
との各々を前記長手軸線を含む仮想平面の両側において
交差させることにより当該両交差箇所に先端切刃を形成
し、且つ、前記左右一対の傾斜端面同志の交差稜線を、
前記両先端切刃における前記長手軸線寄りの始端同志を
結ぶ線上に位置させることによって両先端切刃における
始端の間に、チゼルエッジを形成して成るドリルねじに
おいて、前記両傾斜端面のうち前記両縦溝における第２
溝面に面する部分で且つ前記チゼルエッジに隣接する部
分には、当該チゼルエッジから前記長手軸線と略平行に
延びて前記両縦溝における第１溝面に連なるように構成
したすくい面を形成したことを特徴とするドリルねじ。(1) A shank having a thread formed on its outer periphery, a head integrally formed at an upper end of the shank, and a drill portion formed by forging at a lower end portion of the shank; A pair of left and right inclined end surfaces are provided at the free terminal end of the drill part, and the inclined end surfaces are inclined upwardly from the longitudinal axis of the shank toward the head of the upper end of the shank, and are inclined outwardly with respect to the longitudinal axis. Two vertical grooves are provided so as to intersect with each other at a position that coincides with the longitudinal axis, and are each formed by a first groove surface and a second groove surface, and are provided so as to extend upward from the both inclined end surfaces. A first groove surface constituting a part of each of both longitudinal grooves and the both inclined end surfaces are each intersected on both sides of an imaginary plane including the longitudinal axis, thereby forming a tip cutting edge at the intersection point, and the intersecting ridge lines of the pair of left and right inclined end surfaces,
In the drill screw, a chisel edge is formed between the starting ends of both cutting edges by being positioned on a line connecting the starting ends of the cutting edges near the longitudinal axis, and 2nd in groove
A rake face is formed in a portion facing the groove surface and adjacent to the chisel edge, extending from the chisel edge substantially parallel to the longitudinal axis and continuing to the first groove surface in both longitudinal grooves. A drill screw featuring:
寸法を、一方のすくい面の幅寸法が長く他方のすくい面
の幅寸法が短くなるように構成したことを特徴とする特
許請求の範囲第１項記載のドリルねじ。(2) The width dimension of both rake faces along the longitudinal direction of the chisel edge is configured such that the width dimension of one rake face is longer and the width dimension of the other rake face is shorter. The drill screw described in item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2590385A JPS61282613A (en) | 1985-02-12 | 1985-02-12 | Drill screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2590385A JPS61282613A (en) | 1985-02-12 | 1985-02-12 | Drill screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61282613A true JPS61282613A (en) | 1986-12-12 |
| JPH033083B2 JPH033083B2 (en) | 1991-01-17 |
Family
ID=12178742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2590385A Granted JPS61282613A (en) | 1985-02-12 | 1985-02-12 | Drill screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61282613A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5870509U (en) * | 1981-11-04 | 1983-05-13 | 国分化学工業株式会社 | Self-drilling screw with tap |
| JPS597046A (en) * | 1982-07-03 | 1984-01-14 | 日東紡績株式会社 | Synthetic-resin laminated board enabling sharp cutting by laser beam |
-
1985
- 1985-02-12 JP JP2590385A patent/JPS61282613A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5870509U (en) * | 1981-11-04 | 1983-05-13 | 国分化学工業株式会社 | Self-drilling screw with tap |
| JPS597046A (en) * | 1982-07-03 | 1984-01-14 | 日東紡績株式会社 | Synthetic-resin laminated board enabling sharp cutting by laser beam |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH033083B2 (en) | 1991-01-17 |
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