JPH03196908A - Drill - Google Patents

Abstract

PURPOSE:To reduce a cutting resistance with chips being parted smaller and to enable an efficient cutting work, by dividing the cutting edge tip of a drill in plural phase angles. CONSTITUTION:The cutting edge tip of the sectional face X - X of the whole shape of an ordinary drill is made as per A face and B face of the phase of different angle alpha. When viewed from the tip of the drill by making it like this, the drill tip becomes being delayed by the angle alpha for a 1st cutting edge tip A face and a 2nd cutting edge tip B face for the rotating direction, so in the case of cutting with the drill, the chip generated on the A face and that generated on the B face become a separate chip and the parting of cutting chips is performed. They are then cut out as different cutting chips respectively. Also, a cemented carbide tip may be fitted to the tip.

Description

【発明の詳細な説明】 産業上の利用分野 トリルによる切削加工は穴明けを必要とする加工におい
て一般に広く用いられている。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application Trill cutting is generally widely used in processes that require drilling.

従来の技術 ドリルの切り刃は一般的には二条の（ごく特殊なものは
三条の）ラセン溝の先端に逃げ角を付けた切り刃を形成
し、これを保持回転し、軸方向に推力を加えることによ
り被切削物に切りこみ切削し、ラセン溝から切り屑が二
条の形で削り出されて切削されるものである。Conventional technology The cutting blade of a drill generally has two threads (or three threads in some cases) with a clearance angle at the tip of the helical groove, which is held and rotated to apply thrust in the axial direction. By adding the cutting material, the material to be cut is cut into the workpiece, and chips are cut out in the form of two strips from the helical groove.

発明か解決しようとする問題点 従来のドリルで被切削物を切削した場合、切り込みによ
り切り屑の断面積が大となると、切削抵抗も大となる。Problems to be Solved by the Invention When cutting a workpiece with a conventional drill, as the cross-sectional area of the chips increases due to the depth of cut, the cutting resistance also increases.

これはドリルの経が大となる程いちぢるしく増大するか
ら切削に大きなエネルギーを必要とする。This becomes more difficult as the diameter of the drill increases, so cutting requires a large amount of energy.

問題を解決するための手段 ドリルで被切削物を切削する場合に生じる切り屑を小さ
く分断すれば大きな切り屑より切削抵抗が分断され、小
さくすることができる。したがって能率のよい切削作業
をすることができる。Means for Solving the Problem If the chips produced when cutting a workpiece with a drill are divided into smaller pieces, the cutting resistance will be divided and reduced compared to larger chips. Therefore, efficient cutting work can be performed.

作用 本発明は前記切削時における切削屑の分断をドリルの切
り刃先を複数の位相角に分けることにより可能にした。Function The present invention makes it possible to divide the cutting debris during cutting by dividing the cutting edge of the drill into a plurality of phase angles.

実施例 第１図は通常のドリルの全体の形を示すものであって、
この横断面Ｘ−Ｘは第２図の如くなっている。Embodiment FIG. 1 shows the overall shape of a conventional drill.
This cross section XX is as shown in FIG.

本発明ではこの断面を第３図の如く切り刃先を角度α異
なる位相のＡ及びＢの如くする。In the present invention, this cross section is made such that the cutting edges are A and B having different phases by an angle α, as shown in FIG.

このようにすると第４図トリルの先端から見ると、ドリ
ルの先端は第１の切り刃先Ａ面にたいし、第２の切り刃
先８面は回転方向にたいし角度αだけ遅れたものとなる
からドリルで切削した場合、Ａ面で発生した切屑とＢ面
で発生した切屑は別々の切屑となり切削屑の分断が行わ
れる。そしてそれぞれ異なった切削屑として削り出され
る。また、先端に超硬チップを取りつけてもよい。第５
図は切り刃先端の位相角の遅れをさらにα、βと多段に
したもので有る。In this way, when viewed from the tip of the trill in Figure 4, the tip of the drill will be behind the first cutting edge A side, and the second cutting edge 8 side will be delayed by an angle α with respect to the rotation direction. When cutting with a drill, the chips generated on the A side and the chips generated on the B side become separate chips, and the chips are separated. Each piece is carved out as a different type of cutting waste. Further, a carbide tip may be attached to the tip. Fifth
The figure shows the phase angle delay at the tip of the cutting blade in multiple steps of α and β.

発明の効果 このようにドリリング時に切削屑がドリルの溝１に対し
て２以上の細かい切屑として排出されると、ドリリング
時の切削抵抗が小となり、より能率の良い切削作業をす
ることができドリルの付加価値を高める。Effects of the Invention As described above, when the cutting chips are discharged as two or more fine chips per groove of the drill during drilling, the cutting resistance during drilling is reduced, and more efficient cutting work can be performed. increase added value.

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

第１図はドリルの全体図を示す、Ｘ−Ｘは横断面を示す
ものである。第２図は第１図Ｘ−Ｘ断面を示す。第３図
は第２図の断面に本発明の位相差αを付けた切り刃Ａ、
Ｂを付けた状態をしめす。第４図は第３図の断面のドリ
ルをドリル先端から見た状態を示す。第５図は切刃先端
に位相角α、βを付は切刃をＡ、Ｂ、Ｃ面に分けたもの
を示す。 手 続 補 正 特 許 庁 長 官 殿 ２゜ 発明の名称 ドす １し ３゜ 補正をする者 事件との関係FIG. 1 shows an overall view of the drill, and XX shows a cross section. FIG. 2 shows a cross section taken along the line XX in FIG. 1. Figure 3 shows a cutting blade A with the phase difference α of the present invention added to the cross section of Figure 2;
This shows the state with B attached. FIG. 4 shows the drill having the cross section shown in FIG. 3 as viewed from the tip of the drill. FIG. 5 shows the cutting edge divided into A, B, and C planes with phase angles α and β on the tip of the cutting edge. Procedural amendment Mr. Commissioner of the Japan Patent Office 2゜ Title of invention 1 - 3゜ Relationship with the case of the person making the amendment

Claims (1)

【特許請求の範囲】[Claims] 　ドリルの刃の横断面形状を第４図、第５図の如く切り
刃面を位相を変えたＡ、Ｂ面など複数面として切削加工
時の切削抵抗を減じるごとくなしたドリル。The cross-sectional shape of the drill blade is made into multiple planes such as A and B planes with different phases of the cutting planes as shown in Figs. 4 and 5 to reduce cutting resistance during cutting.