JP2006083976A

JP2006083976A - Drill screw

Info

Publication number: JP2006083976A
Application number: JP2004270837A
Authority: JP
Inventors: Kuniharu Mineyama; 國晴峯山
Original assignee: KAMIYAMA TEKKOSHO KK
Current assignee: KAMIYAMA TEKKOSHO KK
Priority date: 2004-09-17
Filing date: 2004-09-17
Publication date: 2006-03-30

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drill screw superior in cutting performance and tapping performance, by improving so that chips are smoothly removed. <P>SOLUTION: This drill screw 10 has a shaft part 12, a male screw part 14, a drill part 18 and a head part 19. The drill part 18 includes a front cutting edge 26, a horizontal cutting edge 28 continuing with the front cutting edge 26 and arranged in substantially parallel to the axis of the shaft part 12 and a rake surface 34 continuing with the front cutting edge 26 and the horizontal cutting edge 28. A flank 40 continuing with the front cutting edge 26 and the horizontal cutting edge 28, a land part 42 continuing with the flank 40 and a chip discharge part 44 for discharging the chips, are arranged on the reverse side of the rake surface 34. The chip discharge part 44 is arranged between the rake surface 34 and the land part 42. A guide tapered part 16 continuing with the chip discharge part 44 and the land part 42, is arranged between the shaft part 12 and the drill part 18. A plurality of tapping screw parts 22 continuing with the male screw part 14 of the shaft part 12, are arranged at an interval in the peripheral direction of the guide tapered part 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本願発明は、ドリルねじに関し、その先端にねじ下孔を穿孔するためのドリル部を備え、例えば、金属板ないし木質板等の板材を壁面や床面等に固定するために用いられる、ドリルねじに関する。 The present invention relates to a drill screw, which includes a drill portion for drilling a screw hole at the tip thereof, and is used for fixing a plate material such as a metal plate or a wooden plate to a wall surface or a floor surface, for example. About.

本願発明の背景となる先行技術には、頭部、頭部から一体的に延びるねじ山付きシャンク部、および、ねじ山付きシャンク部と一体に連なるドリル部を有し、ドリル部には、左右一対の縦溝を設けたドリルねじがあった（例えば、特許文献１参照。）。
この従来のドリルねじで被締結物を締結する場合、該被締結物に対して、ドリル部でねじ下孔を切削しながら、ねじ山付きシャンク部のねじ山がねじ込まれる。この場合、ドリル部の切削による切り屑は、左右一対の縦溝を介して排出される。 The prior art as the background of the present invention has a head, a threaded shank extending integrally from the head, and a drill that is integrally connected to the threaded shank. There was a drill screw provided with a pair of longitudinal grooves (for example, refer to Patent Document 1).
When fastening an object to be fastened with this conventional drill screw, the thread of the threaded shank part is screwed into the object to be fastened while cutting the screw hole at the drill part. In this case, chips generated by cutting the drill portion are discharged through a pair of left and right vertical grooves.

特許第３０５０６２５号公報（第３頁、図１−図４）Japanese Patent No. 3050625 (page 3, FIGS. 1 to 4)

しかしながら、この従来のドリルねじでは、ねじ山付きシャンク部１１の終端と、切り屑の排出溝となっているドリル部の左右一対の縦溝１５の終端とが直ちに連接された配置となっているために、左右一対の縦溝１５からの切り屑の円滑な排出が、ねじ山付きシャンク部１１の終端部のねじ山１３およびシャンクによって阻害ないし制限される。また、この従来のドリルねじでは、左右一対の縦溝１５を構成する１つの溝面１９の前すくい面が小さくなっているため、切り屑がつまりやすいものとなっている。さらに、切り屑は、ねじ山付きシャンク部の終端部のねじ山およびシャンクに連続的に接触するので、その接触抵抗の影響によりドリル部の切削抵抗が大きくなる恐れもある。そのため、特に、この従来のドリルねじをたとえば板材等の被締結物の厚みが厚いものや該被締結物の強度が強いものに使用した場合には、ドリル部の切削性が低下し、タッピング性も悪くなる。 However, in this conventional drill screw, the end of the threaded shank portion 11 and the end of the pair of left and right vertical grooves 15 of the drill portion serving as a chip discharge groove are immediately connected. Therefore, smooth discharge of chips from the pair of left and right vertical grooves 15 is hindered or restricted by the thread 13 and the shank at the end of the threaded shank 11. Moreover, in this conventional drill screw, since the front scoop surface of the one groove surface 19 which comprises the left-right paired vertical groove 15 is small, it becomes easy to clog a chip. Furthermore, since the chips continuously contact the thread and the shank at the end of the threaded shank, the cutting resistance of the drill may increase due to the influence of the contact resistance. Therefore, in particular, when this conventional drill screw is used for a material to be fastened, such as a plate material, or a material to which the strength of the fastened material is strong, the machinability of the drill portion is reduced and the tapping property is reduced. Also gets worse.

それゆえに、本願発明の主たる目的は、切り屑が円滑に排除されるように改善され、その上、切削性およびタッピング性に優れた、ドリルねじを提供することである。 Therefore, a main object of the present invention is to provide a drill screw which is improved so that chips are smoothly removed, and which is excellent in machinability and tapping properties.

請求項１にかかる本願発明のドリルねじは、柱状の軸部と、軸部の周面に配設される雄ねじ部と、軸部の一方側に配設されるドリル部と、軸部の他方側に配設される頭部とを備え、ドリル部は、該ドリル部の先端部に配設され、所定の先端角を有する第１切刃と、第１切刃に連なり軸部の軸線と略平行に配設される第２切刃と、第１切刃および第２切刃に連なるスクイ面と、第１切刃および第２切刃に連なり、スクイ面の裏側に配設される逃げ面と、逃げ面に連なるランド部と、ドリル部の切削による切り屑を排出する切り屑排出部とを含む、ドリルねじであって、軸部とドリル部との間には、軸部から切り屑排出部およびランド部に連なる案内テーパ部が、軸部の軸線方向に所定の長さをもって配設され、案内テーパ部は、該案内テーパ部の周方向に間隔を隔てて配設され、雄ねじ部に連なる複数のタッピングねじ部を有することを特徴とする、ドリルねじである。
請求項１にかかるドリルねじでは、ドリル部の第１切刃および第２切刃で切削された切り屑が、切り屑排出部に沿って案内テーパ部へと排出され、さらに、案内テーパ部のテーパ面に沿って軸部側へと排出される。この場合、切り屑排出部に加えて案内テーパ部のテーパ面により切り屑が排出されるため、従来のドリルねじに比べて、実質的な切り屑排出通路が長く形成される。そのため、切り屑は円滑にドリル部から排出され、切り屑のつまりが改善される。さらに、請求項１にかかるドリルねじでは、ドリル部の穿孔によりねじ下孔の切削が行われた後、連続して、案内テーパ部のタッピングねじ部のねじ立て作用により、先ず、初期的なねじ立てが行われ、引き続き、軸部の雄ねじ部によりねじ立てが連続的に行われる。この場合、たとえばマシンタップのような切削性が得られる。
請求項２にかかる本願発明は、請求項１にかかる発明に従属するドリルねじであって、スクイ面は、第１切刃の切刃面に連なる第１スクイ面と、第２切刃の切刃面に連なる第２スクイ面とを含み、第１スクイ面および第２スクイ面の交線で形成される稜線が、第２切刃側に傾いて配設されることを特徴とする、ドリルねじである。
請求項２にかかるドリルねじでは、第１スクイ面および第２スクイ面の交線で形成される稜線が第２切刃側に傾いて配設されていることから、第１スクイ面が従来のドリルねじに比べて、軸部の軸線方向に長くなるので、該第１スクイ面が広く形成される。この場合、第１切刃による切削で発生した切り屑のスクイ作用が円滑になるため、切り屑のつまりがより一層改善される。
請求項３にかかる本願発明は、請求項２にかかる発明に従属するドリルねじであって、ドリル部の厚みは、案内テーパ部の最大径よりも薄く形成され、且つ、ドリル部の先端部から根元部にかけて略同じ厚みに形成されることを特徴とする、ドリルねじである。
請求項３にかかるドリルねじでは、ドリル部の厚みが案内テーパ部の最大径よりも薄く形成されているので、ドリル部でねじ下孔の穿孔が行われた場合、穿孔によりできた開口部とドリル部の厚み方向との間にできる隙間が大きくなり、開口部からの切り屑の排出が円滑となり、切り屑のつまりがさらに一層改善される。 A drill screw according to a first aspect of the present invention includes a columnar shaft portion, a male screw portion disposed on a peripheral surface of the shaft portion, a drill portion disposed on one side of the shaft portion, and the other of the shaft portions. A drill portion is disposed at a tip portion of the drill portion, and has a first cutting edge having a predetermined tip angle, and an axis of the shaft portion connected to the first cutting edge. A second cutting blade disposed substantially parallel to the first cutting blade and the squeeze surface continuous to the second cutting blade, a relief connected to the first cutting blade and the second cutting blade and disposed behind the squeeze surface. A drill screw including a surface, a land portion connected to the flank surface, and a chip discharge portion for discharging chips by cutting of the drill portion, and is cut from the shaft portion between the shaft portion and the drill portion. A guide taper portion connected to the waste discharging portion and the land portion is disposed with a predetermined length in the axial direction of the shaft portion, and the guide taper portion is the guide taper portion. Arranged at intervals in the circumferential direction, and having a plurality of tapping screws portion continuous to the male screw portion, a drill screw.
In the drill screw according to the first aspect, the chips cut by the first cutting edge and the second cutting edge of the drill portion are discharged to the guide taper portion along the chip discharge portion, and further, the guide taper portion It is discharged along the tapered surface toward the shaft side. In this case, since the chips are discharged by the tapered surface of the guide taper portion in addition to the chip discharge portion, the substantial chip discharge passage is formed longer than the conventional drill screw. Therefore, the chips are smoothly discharged from the drill portion, and the clogging of the chips is improved. Furthermore, in the drill screw according to the first aspect, after the screw hole is cut by drilling the drill portion, first, the initial screw is continuously turned by the tapping action of the tapping screw portion of the guide taper portion. Standing is performed, and then the threading is continuously performed by the male screw portion of the shaft portion. In this case, machinability such as a machine tap can be obtained.
According to a second aspect of the present invention, there is provided a drill screw according to the first aspect of the present invention, wherein the squeeze surface includes a first squeeze surface continuous with the cutting edge surface of the first cutting edge, and a cutting edge of the second cutting edge. A drill including a second squeeze surface continuous to the blade surface, and a ridge line formed by the intersection of the first squeeze surface and the second squeeze surface is inclined to the second cutting blade side. It is a screw.
In the drill screw according to the second aspect, since the ridge line formed by the intersection line of the first squeeze surface and the second squeeze surface is inclined to the second cutting edge side, the first squeeze surface is conventional. Since it becomes long in the axial direction of a shaft part compared with a drill screw, this 1st squeeze surface is formed widely. In this case, since the squeezing action of the chips generated by cutting with the first cutting edge becomes smooth, the clogging of the chips is further improved.
The present invention according to claim 3 is a drill screw according to the invention according to claim 2, wherein the thickness of the drill portion is formed to be thinner than the maximum diameter of the guide taper portion, and from the tip of the drill portion. It is a drill screw characterized by being formed in substantially the same thickness over a base part.
In the drill screw according to claim 3, since the thickness of the drill portion is formed to be smaller than the maximum diameter of the guide taper portion, when the drill hole is drilled in the drill portion, A gap formed between the drill portion and the thickness direction of the drill portion is increased, so that the chips are smoothly discharged from the opening, and the clogging of the chips is further improved.

本願発明にかかるドリルねじによれば、切り屑が円滑に排除されるように改善され、その上、切削性およびタッピング性に優れたドリルねじが得られる。 According to the drill screw according to the present invention, the drill screw is improved so that the chips are smoothly removed, and in addition, a drill screw excellent in machinability and tapping properties is obtained.

本願発明の上述の目的，その他の目的，特徴および利点は、図面を参照して行う以下の発明を実施するための最良の形態の詳細な説明から一層明らかとなろう。 The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the best mode for carrying out the invention with reference to the drawings.

図１は、本願発明にかかるドリルねじの実施形態の一例を示す図であって、（Ａ）はその正面図であり、（Ｂ）はその右側面図であり、（Ｃ）はその平面図である。図２は、図１（Ａ）の底面図であり、図３は、図１（Ａ）の線Ａ−Ａにおける断面図である。
ドリルねじ１０は、たとえば円柱状の軸部１２を含む。軸部１２の円周面には、雄ねじ部１４が配設される。軸部１２の軸方向の下方側には、該ドリルねじ１０の軸方向の中間部に配設される案内テーパ部１６を介して、ドリル部１８が配設される。軸部１２の軸方向の上方側には、頭部１９が配設される。頭部１９は、電動ドライバ等の締結工具と係合可能に形成されている。案内テーパ部１６は、軸部１２の軸方向の下端部からドリル部１８の長さ方向の上端部にわたり、軸部１２の軸線方向に所定の長さをもって配設されている。 FIG. 1 is a view showing an example of an embodiment of a drill screw according to the present invention, in which (A) is a front view thereof, (B) is a right side view thereof, and (C) is a plan view thereof. It is. 2 is a bottom view of FIG. 1A, and FIG. 3 is a cross-sectional view taken along line AA of FIG.
The drill screw 10 includes, for example, a cylindrical shaft portion 12. A male screw portion 14 is disposed on the circumferential surface of the shaft portion 12. On the lower side in the axial direction of the shaft portion 12, a drill portion 18 is disposed via a guide taper portion 16 disposed in an intermediate portion in the axial direction of the drill screw 10. A head portion 19 is disposed above the shaft portion 12 in the axial direction. The head 19 is formed to be able to engage with a fastening tool such as an electric screwdriver. The guide taper portion 16 is disposed with a predetermined length in the axial direction of the shaft portion 12 from the lower end portion in the axial direction of the shaft portion 12 to the upper end portion in the length direction of the drill portion 18.

案内テーパ部１６は、図１（Ｂ）に示すように、たとえば円すい状の案内部本体２０を含む。案内部本体２０は、該案内部本体２０の軸方向の上端から下端にかけて、相対する両側面が対称的に傾斜しているテーパ面２０ｔを有する。案内部本体２０には、テーパ面２０ｔの周方向に所定の間隔を隔てて、たとえば２つのタッピングねじ部２２が配設される。２つのタッピングねじ部２２は、雄ねじ部２４を含む。雄ねじ部２４は、テーパ面２０ｔの周方向をたとえば二等分する位置で、且つ、案内部本体２０の軸方向の上端部から他端部に配設される。
案内テーパ部１６の雄ねじ部２４は、図１（Ａ），図１（Ｂ）に示すように、軸部１２の雄ねじ部１４に連接するように配設されている。この雄ねじ部２４は、テーパ面２０ｔに沿って、該テーパ面２０ｔの上部周面から下部周面にいくにしたがい、該雄ねじ部２４の周方向の長さ（周径）が漸次短く形成されている。 The guide taper portion 16 includes, for example, a conical guide portion main body 20 as shown in FIG. The guide part main body 20 has a tapered surface 20t whose opposite side surfaces are inclined symmetrically from the upper end to the lower end in the axial direction of the guide part main body 20. For example, two tapping screw portions 22 are disposed in the guide body 20 at a predetermined interval in the circumferential direction of the tapered surface 20t. The two tapping screw portions 22 include a male screw portion 24. The male screw portion 24 is disposed, for example, at a position that bisects the circumferential direction of the tapered surface 20 t and from the upper end portion in the axial direction of the guide portion main body 20 to the other end portion.
The male threaded portion 24 of the guide taper portion 16 is disposed so as to be connected to the male threaded portion 14 of the shaft portion 12 as shown in FIGS. The male threaded portion 24 is formed so that the circumferential length (circumferential diameter) of the male threaded portion 24 is gradually shortened along the tapered surface 20t from the upper circumferential surface to the lower circumferential surface of the tapered surface 20t. Yes.

案内テーパ部１６は、図１（Ａ）に示すように、軸部１２の軸方向の下端部から、後述するドリル部１８のランド部４２および切り屑排出部４４に連なるように配設される。なお、本実施形態例では、例えば、軸部１２の直径が６．６ｍｍ程度に、雄ねじ部１４のねじ外径が８ｍｍ程度に、案内テーパ部１６の軸線方向（軸方向）の長さが８ｍｍ程度に、案内テーパ部１６の最大径が６．６ｍｍ程度に、案内テーパ部１６の最小径が４ｍｍ程度に、案内テーパ部１６の雄ねじ部２４のねじのピッチ数が５ピッチ程度に形成されている。 As shown in FIG. 1A, the guide taper portion 16 is disposed so as to be connected to a land portion 42 and a chip discharge portion 44 of the drill portion 18 described later from the lower end portion in the axial direction of the shaft portion 12. . In the present embodiment, for example, the diameter of the shaft portion 12 is about 6.6 mm, the screw outer diameter of the male screw portion 14 is about 8 mm, and the length of the guide taper portion 16 in the axial direction (axial direction) is 8 mm. The guide taper portion 16 has a maximum diameter of about 6.6 mm, a guide taper portion 16 has a minimum diameter of about 4 mm, and the male thread portion 24 of the guide taper portion 16 has a thread pitch of about 5 pitches. Yes.

ドリル部１８は、たとえば図４（Ａ）に示すように、該ドリル部１８の先端部に、所定の先端角αを有する第１切刃としての前切刃２６が配設される。また、ドリル部１８の幅方向の一端側には、第２切刃としての横切刃２８が配設される。横切刃２８は、軸部１２の軸線と略平行に配設され、前切刃２６と連接されている。前切刃２６および横切刃２８は、それぞれ、前切刃面３０および横切刃面３２を含む。前切刃面３０および横切刃面３２は、たとえば図３に示すように、それぞれ、所定のスクイ角βを有し、前切刃２６および横切刃２８に連なるスクイ面３４に連接されている。この場合、前切刃面３０および横切刃面３２がスクイ角βを有するため、ドリル部１８の切削抵抗を小さくし、該ドリル部１８の切削力が高くなる。 For example, as shown in FIG. 4A, the drill portion 18 is provided with a front cutting edge 26 as a first cutting edge having a predetermined tip angle α at the tip portion of the drill portion 18. Further, a side cutting edge 28 as a second cutting edge is disposed on one end side in the width direction of the drill portion 18. The horizontal cutting edge 28 is disposed substantially parallel to the axis of the shaft portion 12 and is connected to the front cutting edge 26. The front cutting edge 26 and the side cutting edge 28 include a front cutting edge surface 30 and a side cutting edge surface 32, respectively. For example, as shown in FIG. 3, each of the front cutting edge surface 30 and the side cutting edge surface 32 has a predetermined squeeze angle β and is connected to a squeeze surface 34 that is continuous with the front cutting edge 26 and the side cutting edge 28. Yes. In this case, since the front cutting edge surface 30 and the side cutting edge surface 32 have the squeeze angle β, the cutting resistance of the drill portion 18 is reduced, and the cutting force of the drill portion 18 is increased.

スクイ面３４は、たとえば図４（Ａ）に示すように、前切刃面３０に連なる第１スクイ面としての前スクイ面３６および横切刃面３２に連なる第２スクイ面としての横スクイ面３８を含む。前スクイ面３６および横スクイ面３８は、平面状に形成されている。前スクイ面３６および横スクイ面３８は、たとえば図１（Ｃ）で見て、本件ドリルねじ１０を時計方向に回転させたときに、それぞれ、ドリル部１８の前切刃２６および横切刃２８で切削された切り屑をすくうスクイ面として形成されている。前スクイ面３６および横スクイ面３８は、共に、ドリル部１８の回転方向へ向くように形成されている。前スクイ面３６および横スクイ面３８を有するスクイ面３４は、該ドリルねじ１０の軸芯を中心として点対称の位置に２箇所配設されている。言い換えると、ドリル部１８の先端を中心にした点対称の位置に一対（２面）のスクイ面３４が配設されている。 For example, as shown in FIG. 4A, the squeeze surface 34 is a front squeeze surface 36 as a first squeeze surface continuous with the front cutting edge surface 30 and a horizontal squeeze surface as a second squeeze surface continuous with the horizontal cutting edge surface 32. 38. The front squeeze surface 36 and the lateral squeeze surface 38 are formed in a planar shape. For example, as shown in FIG. 1C, the front squeeze surface 36 and the side squeeze surface 38 are respectively viewed from the front cutting edge 26 and the side cutting edge 28 of the drill portion 18 when the drill screw 10 is rotated clockwise. It is formed as a squeeze surface that scoops the chips cut in step (1). Both the front squeeze surface 36 and the lateral squeeze surface 38 are formed so as to face the rotation direction of the drill portion 18. The squeeze surface 34 having the front squeeze surface 36 and the lateral squeeze surface 38 is disposed at two points symmetrical about the axis of the drill screw 10. In other words, a pair (two surfaces) of squeeze surfaces 34 are disposed at point-symmetric positions with the tip of the drill portion 18 as the center.

スクイ面３４の裏面側には、たとえば図２および図４に示すように、前切刃２６および横切刃２８に連なる逃げ面４０および該逃げ面４０に連なるランド部４２が配設されている。逃げ面４０は、たとえば端面が円弧面状に形成され、前切刃２６の端縁に向いて傾斜している。ランド部４２は、膨出して断面円弧状の丸みを帯びた形状で、逃げ面４０と一体的に形成されている。 For example, as shown in FIGS. 2 and 4, a flank 40 connected to the front cutting edge 26 and the side cutting edge 28 and a land portion 42 connected to the flank 40 are disposed on the back side of the squeeze surface 34. . The flank 40 has, for example, an end surface formed in a circular arc shape and is inclined toward the end edge of the front cutting edge 26. The land portion 42 bulges and has a rounded cross-sectional arc shape, and is integrally formed with the flank 40.

また、ドリル部１８には、たとえば図２，図３および図４に示すように、スクイ面３４およびランド部４２間に、該ドリル部１８により切削された切り屑を案内テーパ部１６側へと移送・排出するための切り屑排出部４４が配設される。この場合、前スクイ面３６および横スクイ面３８と、ランド部４２の円弧状の側壁面４３との間に、切り屑排出部４４が配設される。切り屑排出部４４は、たとえば図４（Ａ）に示すように、凹溝４６を含み、該凹溝４６は、前スクイ面３６，横スクイ面３８およびランド部４２の側壁面４３に連なるものとして形成され、前スクイ面３６，横スクイ面３８と協働して切り屑の排出通路を構成するものである。 Further, as shown in FIGS. 2, 3, and 4, for example, as shown in FIG. 2, FIG. 3, and FIG. 4, chips cut by the drill portion 18 are moved to the guide taper portion 16 side. A chip discharging portion 44 for transferring and discharging is disposed. In this case, a chip discharge portion 44 is disposed between the front squeeze surface 36 and the lateral squeeze surface 38 and the arc-shaped side wall surface 43 of the land portion 42. For example, as shown in FIG. 4A, the chip discharge portion 44 includes a concave groove 46, and the concave groove 46 is continuous with the front squeeze surface 36, the lateral squeeze surface 38, and the side wall surface 43 of the land portion 42. And forms a chip discharge passage in cooperation with the front squeeze surface 36 and the lateral squeeze surface 38.

逃げ面４０、ランド部４２および切り屑排出部４４は、それぞれ、該ドリルねじ１０の軸芯を中心として点対称の位置に２箇所配設されている。すなわち、先に説明したスクイ面３４と同様、ドリル部１８の先端を中心にした点対称の位置に、それぞれ、一対（２つ）の逃げ面４０、一対（２つ）ランド部４２および一対（２つ）切り屑排出部４４が配設されている。 The flank 40, the land portion 42, and the chip discharging portion 44 are disposed at two points symmetrical with respect to the axis of the drill screw 10, respectively. That is, like the squeeze surface 34 described above, a pair of (two) flank surfaces 40, a pair (two) land portions 42, and a pair ( 2) A chip discharging part 44 is provided.

本実施形態例では、スクイ面３４において、前スクイ面３６および横スクイ面３８の交線で形成される稜線４８が、たとえば図１（Ａ）および図４（Ａ）に示すように、横切刃２８側に傾いて配設されている。稜線４８は、その長さ方向の一端が切り屑排出部４４の凹溝４６に繋がり、その長さ方向の他端は、前切刃面３０と横切刃面３２との交線５０に繋がるように配置されている。該稜線４８と、横切刃面３２および横スクイ面３８の境界線５２とで構成される傾斜角度θは、たとえば２５度に設定されている。この場合、傾斜角度θは、４５度より小さく設定されることが好ましく、さらに、傾斜角度θは、たとえば１５度〜３５度程度に設定されることがより好ましい。これによって、前スクイ面３６のドリル部１８の軸方向の長さを長くし、該前スクイ面３６の広さをより広く設定することが可能となる。 In the present embodiment example, the ridge line 48 formed by the intersection line of the front squeeze surface 36 and the lateral squeeze surface 38 on the squeeze surface 34 is, for example, as shown in FIGS. 1 (A) and 4 (A). It is arranged to be inclined toward the blade 28 side. One end of the ridge line 48 in the length direction is connected to the concave groove 46 of the chip discharging portion 44, and the other end in the length direction is connected to the intersection line 50 between the front cutting edge surface 30 and the side cutting edge surface 32. Are arranged as follows. The inclination angle θ formed by the ridge line 48 and the boundary line 52 of the horizontal cutting edge surface 32 and the horizontal squeeze surface 38 is set to 25 degrees, for example. In this case, the inclination angle θ is preferably set to be smaller than 45 degrees, and the inclination angle θ is more preferably set to, for example, about 15 degrees to 35 degrees. As a result, the axial length of the drill portion 18 of the front squeeze surface 36 can be increased, and the width of the front squeeze surface 36 can be set wider.

さらに、ドリル部１８の先端部には、たとえば図２および図４に示すように、チゼルエッジ部５４が配設されている。チゼルエッジ部５４は、一対の逃げ面４０が交差した下端の稜線で形成されている。チゼルエッジ部５４は、本件ドリルねじ１０が締結される被締結物に最初に当接される部位であり、長さが短いほど被締結物に対する食い付きが良くなる。 Further, a chisel edge portion 54 is disposed at the tip of the drill portion 18 as shown in FIGS. 2 and 4, for example. The chisel edge portion 54 is formed by a ridge line at the lower end where a pair of flank surfaces 40 intersect. The chisel edge portion 54 is a portion that is first brought into contact with a fastened object to which the present drill screw 10 is fastened. The shorter the length, the better the biting of the fastened object.

また、本実施形態例では、ドリル部１８の厚みが、案内テーパ部１６の最大径よりも薄く形成され、且つ、ドリル部１８の先端部から根元部にかけて略同じに形成されている。ドリル部１８の厚みは、たとえば図１（Ｂ）および図４（Ｂ），図４（Ｃ）に示すように、一対のランド部４２の最頂面間の厚み２ｔで形成されている。この場合、ｔは、たとえば２．０ｍｍ程度に形成されている。 In the present embodiment, the thickness of the drill portion 18 is formed to be thinner than the maximum diameter of the guide taper portion 16, and is formed substantially the same from the distal end portion to the root portion of the drill portion 18. The drill portion 18 is formed with a thickness 2t between the top surfaces of the pair of land portions 42 as shown in FIGS. 1B, 4B, and 4C, for example. In this case, t is formed to about 2.0 mm, for example.

上述した本実施形態例のドリルねじ１０では、ドリル部１８の前切刃２６および横切刃２８で切削された切り屑が切り屑排出溝部４４に沿って案内テーパ部１６へと排出され、さらに、案内テーパ部１６のテーパ面２０ｔに沿って軸部１２側へと排出される。この場合、切り屑排出部４４に加えて、案内テーパ部１６のテーパ面２０ｔにより切り屑が排出される。そのため、従来のドリルねじに比べて、実質的な切り屑排出通路が長く形成される。すなわち、切り屑は円滑にドリル部１８から排出され、切り屑のつまりが改善される。さらに、このドリルねじ１０では、ドリル部１８の穿孔によりねじ下孔の切削が行われた後、連続して、案内テーパ部１６のタッピングねじ部２２のねじ立て作用により、初期的なねじ立てが行われ、それに連続して、軸部１２の雄ねじ部１４によりねじ立てが連続的に行われる。そのため、このドリルねじ１０では、たとえばマシンタップのような切削性が得られる。 In the drill screw 10 of the present embodiment described above, chips cut by the front cutting edge 26 and the side cutting edge 28 of the drill portion 18 are discharged to the guide taper portion 16 along the chip discharge groove portion 44, and The guide taper portion 16 is discharged toward the shaft portion 12 along the tapered surface 20t. In this case, chips are discharged by the tapered surface 20 t of the guide taper portion 16 in addition to the chip discharge portion 44. Therefore, the substantial chip discharge passage is formed longer than the conventional drill screw. That is, the chips are smoothly discharged from the drill portion 18, and the clogging of the chips is improved. Further, in this drill screw 10, after the screw hole is cut by drilling the drill portion 18, initial tapping is continuously performed by tapping action of the tapping screw portion 22 of the guide taper portion 16. In succession to this, tapping is continuously performed by the male screw portion 14 of the shaft portion 12. Therefore, with this drill screw 10, cutting performance such as a machine tap can be obtained.

また、該ドリルねじ１０では、前スクイ面３６および横スクイ面３８の交線で形成される稜線４８が横切刃２８側に傾いて形成されていることから、前スクイ面３６が従来のドリルねじに比べて、軸部１２の軸線方向に長くなるので、該前スクイ面３６が広く形成される。そのため、ドリル部１８の前切刃２６による切削で発生した切り屑のスクイ作用が円滑になり、切り屑のつまりがより一層改善される。 Further, in the drill screw 10, the ridge line 48 formed by the intersecting line of the front squeeze surface 36 and the lateral squeeze surface 38 is formed to be inclined toward the side cutting edge 28, so that the front squeeze surface 36 is a conventional drill. Since it becomes longer in the axial direction of the shaft portion 12 than the screw, the front squeeze surface 36 is formed wider. Therefore, the squeezing action of the chips generated by cutting with the front cutting edge 26 of the drill portion 18 becomes smooth, and the clogging of the chips is further improved.

さらに、該ドリルねじ１０では、ドリル部１８の厚みが案内テーパ部１６の最大径よりも薄く形成されている。そのため、ドリル部１８でねじ下孔の穿孔が行われた場合に、たとえば図５に示すように、ドリル部１８の切削作用により被締結物１００に穿孔された開口部Ｈと、ドリル部１８の厚み方向との間にできる隙間Ｇが大きくなり、開口部Ｈからの切り屑の排出が円滑となる。したがって、切り屑のつまりがより一層改善される。 Further, in the drill screw 10, the thickness of the drill portion 18 is formed thinner than the maximum diameter of the guide taper portion 16. Therefore, when the drill hole 18 is drilled by the drill portion 18, for example, as shown in FIG. 5, the opening H drilled in the fastened object 100 by the cutting action of the drill portion 18 and the drill portion 18. The gap G formed between the thickness direction and the thickness direction becomes large, and the discharge of chips from the opening H becomes smooth. Therefore, clogging of chips is further improved.

上述してきたように、図１〜図５に示した本実施形態例のドリルねじ１０は、切り屑が円滑に排除されるように改善され、さらに、切削性およびタッピング性にも優れているので、このドリルねじ１０をたとえば板材等の被締結物の厚みが厚いものや該被締結物の強度が強いものに使用した場合でも、切削性およびタッピング性が低下することなく、該被締結物を強固に締結・固定することが可能となる。 As described above, the drill screw 10 of the present embodiment shown in FIGS. 1 to 5 is improved so that chips are smoothly removed, and further has excellent cutting performance and tapping performance. Even when this drill screw 10 is used for a material to be fastened, such as a plate material, or a material to which the strength of the material to be fastened is strong, the material to be fastened is not deteriorated in cutting and tapping properties. It is possible to fasten and fix firmly.

図６は、本願発明にかかるドリルねじの実施形態の他の例を示す図であって、（Ａ）はその正面図であり、（Ｂ）はその底面図であり、図７は、図６（Ａ）の線Ｂ−Ｂにおける断面図である。図８は、図６および図７で示したドリルねじのドリル部の拡大正面図である。
図６〜図８に示したドリルねじ６０は、上述したドリルねじ１０と比べて、特に、ドリル部１８がリーマ部６２を有する点で相違している。すなわち、該ドリルねじ６０には、案内テーパ部１６の下側にリーマ部６２が配設されている。リーマ部６２は、該ドリルねじ１０の軸線方向と略直交するように、ドリル部１８の幅方向に張り出して配設されている。該ドリルねじ６０では、図１〜図５で示したドリルねじ１０と同様の構造および作用・効果を有する案内テーパ部１６およびドリル部１８を有している。そのため、該ドリルねじ６０は、図１〜図５で示したドリルねじ１０と同様に、切削性およびタッピング性に優れたものとなっている。したがって、該ドリルねじ６０でも、切り屑がつまってドリル部１８の切削性を低下させることがない。 6A and 6B are views showing another example of the embodiment of the drill screw according to the present invention, in which FIG. 6A is a front view thereof, FIG. 6B is a bottom view thereof, and FIG. It is sectional drawing in line BB of (A). FIG. 8 is an enlarged front view of the drill portion of the drill screw shown in FIGS. 6 and 7.
The drill screw 60 shown in FIGS. 6 to 8 is different from the above-described drill screw 10 in that the drill portion 18 has a reamer portion 62. That is, the drill screw 60 is provided with a reamer portion 62 below the guide taper portion 16. The reamer portion 62 is disposed so as to project in the width direction of the drill portion 18 so as to be substantially orthogonal to the axial direction of the drill screw 10. The drill screw 60 includes a guide taper portion 16 and a drill portion 18 having the same structure, operation and effect as the drill screw 10 shown in FIGS. Therefore, the drill screw 60 is excellent in machinability and tapping properties, similar to the drill screw 10 shown in FIGS. Therefore, even with the drill screw 60, chips are not clogged and the cutting performance of the drill portion 18 is not deteriorated.

本願発明にかかるドリルねじは、特に、厚板や高張力鋼板等の被締結物に締結されて有効であり、例えば、コンテナ等の壁面や床面等に金属板ないし木質板を固定するのに用いて好適なものである。 The drill screw according to the present invention is particularly effective when fastened to an object to be fastened such as a thick plate or a high-strength steel plate, for example, for fixing a metal plate or a wooden plate to a wall surface or a floor surface of a container or the like. It is suitable for use.

本願発明にかかるドリルねじの実施形態の一例を示す図であって、（Ａ）はその正面図であり、（Ｂ）はその右側面図であり、（Ｃ）はその平面図である。It is a figure which shows an example of embodiment of the drill screw concerning this invention, Comprising: (A) is the front view, (B) is the right view, (C) is the top view. 図１（Ａ）の底面図である。FIG. 2 is a bottom view of FIG. 図１（Ａ）の線Ａ−Ａにおける断面図である。It is sectional drawing in line AA of FIG. 図１〜図３で示したドリルねじのドリル部の拡大図であって、（Ａ）はその正面図であり、（Ｂ）はその左側面図であり、（Ｃ）はその底面図である。It is an enlarged view of the drill part of the drill screw shown in FIGS. 1-3, (A) is the front view, (B) is the left view, (C) is the bottom view. . 図１〜図４で示したドリルねじによる穿孔状態の一例を示す図であって、（Ａ）はその正面図であり、（Ｂ）はその右側面図である。It is a figure which shows an example of the drilling state by the drill screw shown in FIGS. 1-4, Comprising: (A) is the front view, (B) is the right view. 本願発明にかかるドリルねじの実施形態の他の例を示す図であって、（Ａ）はその正面図であり、（Ｂ）はその底面図である。It is a figure which shows the other example of embodiment of the drill screw concerning this invention, Comprising: (A) is the front view, (B) is the bottom view. 図６（Ａ）の線Ｂ−Ｂにおける断面図である。It is sectional drawing in line BB of FIG. 6 (A). 図６および図７で示したドリルねじのドリル部の拡大正面図である。FIG. 8 is an enlarged front view of a drill portion of the drill screw shown in FIGS. 6 and 7.

Explanation of symbols

１０ドリルねじ
１２軸部
１４雄ねじ部
１６案内テーパ部
１８ドリル部
１９頭部
２０案内部本体
２０ｔテーパ面
２２タッピングねじ部
２４雄ねじ部
２６前切刃（第１切刃）
２８横切刃（第２切刃）
３０前切刃面（第１切刃面）
３２横切刃面（第２切刃面）
３４スクイ面
３６前スクイ面（第１スクイ面）
３８横スクイ面（第２スクイ面）
４０逃げ部
４２ランド部
４３ランド部の側壁面
４４切り屑排出部
４６凹溝４６
４８稜線
５０交線
５２境界線
５４チゼルエッジ
６０ドリルねじ
６２リーマ部
１００被締結物
α ドリル部の先端角
β 前切刃および横切刃のスクイ角
ｔドリル部の厚み
Ｈ開口部
Ｇ隙間 DESCRIPTION OF SYMBOLS 10 Drill screw 12 Shaft part 14 Male thread part 16 Guide taper part 18 Drill part 19 Head 20 Guide part main body 20t Tapered surface 22 Tapping screw part 24 Male thread part 26 Front cutting edge (1st cutting edge)
28 Horizontal cutting edge (second cutting edge)
30 Front cutting edge surface (first cutting edge surface)
32 Horizontal cutting edge (2nd cutting edge)
34 Squee Surface 36 Front Squee Surface (First Squee Surface)
38 Side squeeze surface (second squeeze surface)
40 Escape portion 42 Land portion 43 Side wall surface of land portion 44 Chip discharge portion 46 Concave groove 46
48 Edge line 50 Intersection line 52 Boundary line 54 Chisel edge 60 Drill screw 62 Reamer part 100 Fastened object α Tip angle of drill part β Squee angle of front and side cutting edges t Thickness of drill part H Opening G Gap

Claims

A columnar shaft portion, a male screw portion disposed on the peripheral surface of the shaft portion, a drill portion disposed on one side of the shaft portion, and a head disposed on the other side of the shaft portion ,
The drill portion is disposed at a tip portion of the drill portion, and has a first cutting edge having a predetermined tip angle, and a second cutting edge that is connected to the first cutting edge and is substantially parallel to the axis of the shaft portion. A blade, a squeeze surface continuous to the first cutting blade and the second cutting blade, a flank surface connected to the first cutting blade and the second cutting blade, a flank surface disposed on the back side of the squeeze surface, and a flank surface A drill screw including a land part and a chip discharge part for discharging chips by cutting of the drill part,
Between the shaft portion and the drill portion, a guide taper portion continuous from the shaft portion to the chip discharging portion and the land portion is disposed with a predetermined length in the axial direction of the shaft portion, The guide taper portion is provided with a plurality of tapping screw portions arranged at intervals in the circumferential direction of the guide taper portion and connected to the male screw portion.

The squeeze surface includes a first squeeze surface continuous with the cutting edge surface of the first cutting edge and a second squeeze surface continuous with the cutting edge surface of the second cutting edge, and the first squeeze surface and the second squeeze surface. 2. The drill screw according to claim 1, wherein a ridge line formed by intersecting lines is inclined toward the second cutting edge.

The thickness of the drill portion is formed to be thinner than the maximum diameter of the guide taper portion, and is formed to have substantially the same thickness from a tip portion to a root portion of the drill portion. Drill screw.