JP2017113865A

JP2017113865A - Chamfering tool

Info

Publication number: JP2017113865A
Application number: JP2015255153A
Authority: JP
Inventors: 貴行畔上; Takayuki Azegami
Original assignee: Mitsubishi Materials Corp
Current assignee: Mitsubishi Materials Corp
Priority date: 2015-12-25
Filing date: 2015-12-25
Publication date: 2017-06-29

Abstract

PROBLEM TO BE SOLVED: To provide a chamfering tool capable of effectively restraining the occurrence of chattering vibration, without impairing a grade of a chamfering surface, or without becoming difficult in re-polishing in the case of a solid type chamfering tool.SOLUTION: A chip discharge groove 4 extending to the rear end side of a tool body 1 is formed on the tip part outer periphery of the tool body 1 rotated around the axis O, and an outer peripheral edge part of a wall surface turning in the tool rotation direction T of this chip discharge groove 4 is provided with a first chamfering blade 6 turning to the inner peripheral side in a straight line shape toward the rear end side of the tool body 1 and a second chamfering blade 7 turning to the outer peripheral side in a straight line shape toward the rear end side of the tool body 1. A chamfering surface 5a of the first chamfering blade 6 and a chamfering surface 5 of the second chamfering blade 7 are positioned on a plane parallel to the axis O or on a plane including the axis O, and are mutually dislocated in a phase in the circumferential direction.SELECTED DRAWING: Figure 1

Description

本発明は、被削材に形成された貫通孔や凹溝の開口部、あるいは板状部の周縁に面取りを施す面取り工具に関するものである。 The present invention relates to a chamfering tool for chamfering a through hole or a groove opening formed in a work material or a peripheral edge of a plate-like part.

このような面取り工具として、例えば特許文献１には、シャンクと該シャンクから連続する本体部と該本体部の反シャンク側先端部に形成された切削刃とを備え、本体部には切削刃側からシャンク側に向かって小径となる第一面取り刃と、第一面取り刃よりシャンク側に位置し切削刃側からシャンク側に向かって大径となる第二面取り刃とを備えたものが提案されている。このような面取り工具では、第一面取り刃と第二面取り刃との間の軸線方向長さを、被削材の被面取り加工部間の軸線方向長さと略同一とすることにより、被削材に形成された貫通孔の両開口部の面取りを第一、第二面取り刃によって同時に行うことができる。 As such a chamfering tool, for example, Patent Document 1 includes a shank, a main body portion continuous from the shank, and a cutting blade formed at a tip portion on the anti-shank side of the main body portion. With a first chamfering blade with a smaller diameter from the first chamfering side to a shank side, and a second chamfering blade with a larger diameter from the cutting blade side toward the shank side. ing. In such a chamfering tool, the axial length between the first chamfering blade and the second chamfering blade is made substantially the same as the axial length between the chamfered portions of the workpiece, so that the workpiece is cut. The first and second chamfering blades can be chamfered at the same time by chamfering both openings of the through-hole formed in the first and second chamfers.

特開２００５−０２２００３号公報Japanese Patent Laid-Open No. 2005-022003

ところが、このような面取り工具では、上記第一、第二面取り刃が被削材の貫通孔の開口部に同時に食い付くと、切削抵抗が瞬間的に増大してしまい、このような切削抵抗の増大が周期的に繰り返されることによりビビリ振動を引き起こすことになる。ここで、このようなビビリ振動の発生を抑えるために、例えば切屑排出溝を捩れ溝状として面取り刃が徐々に被削材に食い付くようにすることも考えられるが、その場合には第一、第二面取り刃のいずれか一方の軸方向すくい角が負角となり、面取り面の品位を損ねることになる。さらに、第一、第二面取り刃の軸方向すくい角をともに正角にしようとして、切屑排出溝の工具回転方向を向く壁面をＶ字状にすると、特にソリッドタイプの面取り工具の場合には再研磨が困難となる。 However, in such a chamfering tool, if the first and second chamfering blades simultaneously bite into the opening of the through hole of the work material, the cutting resistance increases instantaneously, and such cutting resistance increases. By repeating the increase periodically, chatter vibration is caused. Here, in order to suppress the occurrence of such chatter vibration, for example, it is conceivable that the chamfering blade gradually bites the work material by forming the chip discharge groove into a twisted groove shape. The axial rake angle of either one of the second chamfering blades becomes a negative angle, and the quality of the chamfered surface is impaired. Furthermore, if both the axial rake angles of the first and second chamfering blades are made to be positive angles and the wall surface facing the tool rotation direction of the chip discharge groove is made V-shaped, it will be re-applied particularly in the case of solid type chamfering tools. Polishing becomes difficult.

本発明は、このような背景の下になされたもので、面取り面の品位が損ねられたり、ソリッドタイプの面取り工具の場合に再研磨が困難となったりすることなく、ビビリ振動の発生を効果的に抑えることが可能な面取り工具を提供することを目的としている。 The present invention has been made under such a background, and is effective in generating chatter vibration without impairing the quality of the chamfered surface or making regrind difficult in the case of a solid type chamfering tool. An object of the present invention is to provide a chamfering tool that can be suppressed.

上記課題を解決して、このような目的を達成するために、本発明は、軸線回りに回転される工具本体の先端部外周に、上記工具本体の後端側に延びる切屑排出溝が形成され、この切屑排出溝の工具回転方向を向く壁面の外周縁部には、上記工具本体の後端側に向かうに従い直線状に内周側に向かう第１面取り刃と、上記工具本体の後端側に向かうに従い直線状に外周側に向かう第２面取り刃とが設けられ、これら第１面取り刃のすくい面と第２面取り刃のすくい面とは、上記軸線に平行な平面上、または該軸線を含む平面上に位置しているとともに、周方向の位相が互いにずらされていることを特徴とする。 In order to solve the above problems and achieve such an object, according to the present invention, a chip discharge groove extending toward the rear end side of the tool body is formed on the outer periphery of the tip of the tool body rotated around the axis. The outer peripheral edge of the wall of the chip discharge groove facing the tool rotation direction has a first chamfering blade linearly toward the inner peripheral side toward the rear end side of the tool body, and the rear end side of the tool body. A second chamfering blade linearly toward the outer peripheral side as it goes to, and the rake face of the first chamfering blade and the rake face of the second chamfering blade are on a plane parallel to the axis or the axis line. It is located on the plane which contains, and the phase of the circumferential direction is shifted mutually.

このように構成された面取り工具では、第１面取り刃のすくい面と第２面取り刃のすくい面が軸線に平行な平面上、または該軸線を含む平面上に位置しているので、第１，第２面取り刃の軸方向すくい角はともに０°となるので、面取り面の品位が損ねられることがない。また、上記切屑排出溝の工具回転方向を向く壁面と、この壁面の工具回転方向とは反対側に連なる上記工具本体の外周逃げ面との交差稜線部に、上記第１面取り刃と上記第２面取り刃とが形成されている場合、すなわちソリッドタイプの面取り工具であっても、上記平面に平行に再研磨を施すことで再研磨が容易となる。 In the chamfering tool configured as described above, the rake face of the first chamfering blade and the rake face of the second chamfering blade are located on a plane parallel to the axis or on a plane including the axis. Since both the rake angles in the axial direction of the second chamfering blade are 0 °, the quality of the chamfered surface is not impaired. In addition, the first chamfering blade and the second chamfering edge are formed on a cross ridge line portion between the wall surface of the chip discharge groove facing the tool rotation direction and the outer peripheral flank of the tool body that is connected to the opposite side of the tool rotation direction of the wall surface. When a chamfering blade is formed, that is, even a solid type chamfering tool, repolishing becomes easy by performing repolishing parallel to the plane.

そして、これら第１面取り刃のすくい面と第２面取り刃のすくい面とは、周方向の位相が互いにずらされているので、第１、第２面取り刃はすくい面が工具回転方向側に位置するものから順に被削材に食い付くことになる。このため、これらの面取り刃が同時に被削材に食い付く場合のように切削抵抗が瞬間的に増大するのを防ぐことができ、このような切削抵抗の増大が周期的に繰り返されることによってビビリ振動が発生されるのを防止することができる。 Since the rake face of the first chamfering blade and the rake face of the second chamfering blade are shifted in the circumferential direction, the rake face of the first and second chamfering blades is positioned on the tool rotation direction side. It will bite into the work material in order from what you do. For this reason, it is possible to prevent the cutting resistance from increasing instantaneously as in the case where these chamfering blades simultaneously bite into the work material, and the increase in the cutting resistance is periodically repeated. Generation of vibration can be prevented.

以上説明したように、本発明によれば、被削材の面取り面の品位を維持することができるとともに、ソリッドタイプの面取り工具でも再研磨を容易とすることができ、さらに切削抵抗の増大によるビビリ振動の発生を防止して円滑かつ効率的な面取り加工を行うことが可能となる。 As described above, according to the present invention, the quality of the chamfered surface of the work material can be maintained, and re-polishing can be facilitated even with a solid type chamfering tool, and further, the cutting resistance is increased. Smooth and efficient chamfering can be performed by preventing chatter vibration.

本発明の一実施形態を示す斜視図である。It is a perspective view which shows one Embodiment of this invention. 図１に示す実施形態の側面図である。It is a side view of embodiment shown in FIG. 図１に示す実施形態の拡大正面図である。It is an enlarged front view of embodiment shown in FIG.

図１ないし図３は、本発明の一実施形態を示すものである。本実施形態において、工具本体１は、超硬合金等の硬質材料により軸線Ｏを中心とした略円柱状に形成され、その後端部（図１、図２において上側部分）は円柱状のままのシャンク部２とされるとともに、先端部（図１、図２において下側部分）は切刃部３とされる。このような面取り工具は、上記シャンク部２が工作機械の主軸に把持されて軸線Ｏ回りに回転されつつ、該軸線Ｏに直交する方向に送り出されて切刃部３により被削材の貫通孔の両開口部や板状部の板厚方向の両側に位置する周縁に面取り加工を施すのに用いられる。 1 to 3 show an embodiment of the present invention. In the present embodiment, the tool body 1 is formed in a substantially cylindrical shape centering on the axis O with a hard material such as cemented carbide, and the rear end portion (the upper portion in FIGS. 1 and 2) remains cylindrical. The tip portion (the lower portion in FIGS. 1 and 2) is the cutting blade portion 3 while being the shank portion 2. In such a chamfering tool, the shank portion 2 is gripped by the main shaft of the machine tool and rotated around the axis O, and is sent out in a direction perpendicular to the axis O and is cut through the through-hole of the work material by the cutting edge portion 3. It is used for chamfering the peripheral edges located on both sides of the two openings and the plate-like portion in the plate thickness direction.

工具本体１の先端部である切刃部３の外周には、切刃部３の先端面に開口して工具本体１の後端側に延びる切屑排出溝４が、周方向に間隔をあけて複数条形成されている。本実施形態では、４条の切屑排出溝４が周方向に等間隔に形成されており、これらの切屑排出溝４は軸線Ｏに直交する断面においてＬ字状をなしていて、これらの切屑排出溝４の工具回転方向Ｔを向く壁面の外周縁部には、この壁面をすくい面５として、工具本体１の後端側に向かうに従い直線状に内周側に向かう第１面取り刃６と、工具本体１の後端側に向かうに従い直線状に外周側に向かう第２面取り刃７とが設けられている。これら第１、第２面取り刃６、７は軸線Ｏに対して４５°傾斜している。 On the outer periphery of the cutting edge 3 that is the tip of the tool body 1, chip discharge grooves 4 that open to the tip surface of the cutting edge 3 and extend toward the rear end of the tool body 1 are spaced apart in the circumferential direction. Multiple strips are formed. In this embodiment, four chip discharge grooves 4 are formed at equal intervals in the circumferential direction, and these chip discharge grooves 4 are L-shaped in a cross section orthogonal to the axis O, and these chip discharges On the outer peripheral edge of the wall surface facing the tool rotation direction T of the groove 4, a first chamfering blade 6 that linearly moves toward the inner peripheral side toward the rear end side of the tool body 1, with the wall surface as a rake face 5; A second chamfering blade 7 that linearly extends toward the outer peripheral side as it goes toward the rear end side of the tool body 1 is provided. The first and second chamfering blades 6 and 7 are inclined by 45 ° with respect to the axis O.

ここで、本実施形態では、切刃部３の外周面である外周逃げ面８が、工具回転方向Ｔ側から見て内周側に向かうに従い軸線Ｏ方向の幅が漸次幅狭となる等脚台形状に切り欠かれており、こうして等脚台形状に切り欠かれた部分の斜辺部分に直線状の第１、第２面取り刃６、７が形成されている。すなわち、本実施形態の面取り工具は、上記すくい面５とされる切屑排出溝４の工具回転方向Ｔを向く壁面と、この壁面の工具回転方向Ｔとは反対側に連なる上記外周逃げ面８との交差稜線部に、第１面取り刃６と上記第２面取り刃７とが直接形成された、ソリッドタイプの面取り工具であり、第１面取り刃６は第２面取り刃７よりも工具本体１の先端側に間隔をあけて形成される。 Here, in the present embodiment, the outer peripheral flank 8 that is the outer peripheral surface of the cutting blade portion 3 is an equal leg whose width in the axis O direction gradually becomes narrower toward the inner peripheral side when viewed from the tool rotation direction T side. The first and second chamfering blades 6 and 7 that are linear are formed on the hypotenuse part of the part that is cut out in the trapezoidal shape. That is, the chamfering tool of the present embodiment includes a wall surface facing the tool rotation direction T of the chip discharge groove 4 that is the rake face 5, and the outer peripheral flank surface 8 that is continuous to the opposite side of the tool rotation direction T of the wall surface. Is a solid type chamfering tool in which the first chamfering blade 6 and the second chamfering blade 7 are directly formed at the intersecting ridge line portion, and the first chamfering blade 6 is closer to the tool body 1 than the second chamfering blade 7. It is formed with a gap on the tip side.

さらに、断面Ｌ字状に形成された切屑排出溝４の工具回転方向Ｔを向く上記壁面は、本実施形態では軸線Ｏを含む平面上に位置するように形成されており、第２面取り刃７はこの壁面を上記すくい面５として、上記等脚台形状に切り欠かれた外周逃げ面８の工具本体１後端側の斜辺に形成されている。従って、第２面取り刃７の軸方向すくい角は０°であるとともに、径方向すくい角も０°である。なお、この第２面取り刃７に連なる外周逃げ面８には、工具回転方向Ｔの反対側に向かうに従い工具本体１の内周側に向かうように逃げ角が与えられている。 Furthermore, in the present embodiment, the wall surface facing the tool rotation direction T of the chip discharge groove 4 formed in an L-shaped cross section is formed on a plane including the axis O, and the second chamfering blade 7 With this wall surface as the rake face 5, the outer peripheral flank face 8 cut out in the shape of an isosceles trapezoid is formed on the hypotenuse on the rear end side of the tool body 1. Accordingly, the axial rake angle of the second chamfering blade 7 is 0 °, and the radial rake angle is also 0 °. The outer peripheral flank 8 connected to the second chamfering blade 7 is provided with a clearance angle toward the inner peripheral side of the tool body 1 as it goes to the opposite side of the tool rotation direction T.

これに対して、切屑排出溝４の工具回転方向Ｔを向く上記壁面の先端部には、この壁面から工具回転方向Ｔの反対側に凹むように段差面５ａが形成されている。この段差面５ａと上記壁面との境界は、等脚台形状に切り欠かれた外周逃げ面８の軸線Ｏに平行に延びる直線部分と工具本体１の先端側の斜辺の交点から、先端側に向かうに従い工具本体１の内周側に向かうように延びており、従って第１面取り刃６は、切屑排出溝４の工具回転方向Ｔを向く壁面のうちでも、この段差面５ａをすくい面として、該第１面取り刃６に連なる外周逃げ面８との交差稜線部に形成される。 On the other hand, a step surface 5a is formed at the tip of the wall surface facing the tool rotation direction T of the chip discharge groove 4 so as to be recessed from the wall surface to the opposite side of the tool rotation direction T. The boundary between the step surface 5a and the wall surface is from the intersection of a straight line portion extending parallel to the axis O of the outer peripheral flank 8 cut out in an isosceles trapezoidal shape and a hypotenuse on the tip side of the tool body 1 to the tip side. The first chamfering blade 6 extends toward the inner peripheral side of the tool body 1 as it goes, and thus the stepped surface 5a of the wall surface facing the tool rotation direction T of the chip discharge groove 4 is used as a rake face. It is formed at the intersecting ridge line portion with the outer peripheral flank 8 continuous to the first chamfering blade 6.

そして、この段差面５ａも、本実施形態では軸線Ｏを含む平面上に位置するように形成されており、従って第１面取り刃６の軸方向すくい角および径方向すくい角も０°であるとともに、第１面取り刃６のすくい面となる上記段差面５ａと、第２面取り刃７のすくい面５となる切屑排出溝４の工具回転方向Ｔを向く上記壁面とは、周方向の位相が互いにずらされている。なお、この第１面取り刃６に連なる外周逃げ面８にも、工具回転方向Ｔの反対側に向かうに従い工具本体１の内周側に向かうように逃げ角が与えられている。 The step surface 5a is also formed so as to be positioned on a plane including the axis O in the present embodiment, and therefore the axial rake angle and the radial rake angle of the first chamfering blade 6 are also 0 °. The circumferential surface of the stepped surface 5a serving as the rake face of the first chamfering blade 6 and the wall surface facing the tool rotation direction T of the chip discharge groove 4 serving as the rake face 5 of the second chamfering blade 7 are mutually aligned. It is shifted. In addition, the clearance angle is given also to the outer peripheral flank 8 which continues to this 1st chamfering blade 6 so that it may go to the inner peripheral side of the tool main body 1 as it goes to the opposite side of the tool rotation direction T.

このように構成された面取り工具によって、例えば被削材に形成された貫通孔の両開口部の面取り加工を行う場合には、第１、第２面取り刃６、７が形成される上記等脚台形状に切り欠かれた部分の斜辺部分間の軸線Ｏ方向の幅の範囲が、この貫通孔の両開口部間の距離を含むように設定される。そして、工具本体１の切刃部３を貫通孔内に挿入して、第１、第２面取り刃６、７が両開口部に対向するように配置し、工具本体１を回転させつつ貫通穴の内周面に近づけてゆき、第１、第２面取り刃６、７を両開口部に食い付かせるとともに、工具本体１を貫通穴の内周面に沿って送り出すことにより、貫通穴の全周に亙って両開口部に同時に面取り加工を行う。 When the chamfering tool configured as described above is used to chamfer both openings of the through hole formed in the work material, for example, the above-mentioned isosceles on which the first and second chamfering blades 6 and 7 are formed. The range of the width in the direction of the axis O between the oblique sides of the trapezoidal part is set so as to include the distance between both openings of the through hole. Then, the cutting blade portion 3 of the tool body 1 is inserted into the through hole, the first and second chamfering blades 6 and 7 are arranged so as to face both the openings, and the through hole is rotated while the tool body 1 is rotated. The first and second chamfering blades 6 and 7 are bitten into both openings, and the tool body 1 is sent out along the inner peripheral surface of the through hole, so that all of the through holes are formed. Chamfering is performed on both openings simultaneously around the circumference.

このとき、上記構成の面取り工具においては、第１、第２面取り刃６、７の軸方向すくい角が０°であるため、いずれか一方が負角になる場合のように、この負角となった一方の面取り刃による面取り面が毟れを生じるなどして加工面品位が損なわれるようなことがない。また、特に本実施形態のようなソリッドタイプの面取り工具では、第１、第２面取り刃６、７の軸方向すくい角をともに正角に使用とした場合のように再研磨が困難となることもなく、第１面取り刃６のすくい面となる上記段差面５ａと、第２面取り刃７のすくい面５となる切屑排出溝４の工具回転方向Ｔを向く上記壁面を、それぞれ軸線Ｏを含む平面に沿うように再研磨すればよい。 At this time, in the chamfering tool having the above-described configuration, the axial rake angle of the first and second chamfering blades 6 and 7 is 0 °. The quality of the machined surface is not impaired, for example, the chamfered surface of the one chamfering blade is bent. In particular, in the solid type chamfering tool as in the present embodiment, regrinding becomes difficult as in the case where the axial rake angles of the first and second chamfering blades 6 and 7 are both used as positive angles. The above-mentioned stepped surface 5a that becomes the rake face of the first chamfering blade 6 and the above-mentioned wall surface facing the tool rotation direction T of the chip discharge groove 4 that becomes the rake face 5 of the second chamfering blade 7 each include an axis O. What is necessary is just to re-grind so that a plane may be followed.

そして、これらの第１面取り刃６のすくい面となる上記段差面５ａと、第２面取り刃７のすくい面５となる切屑排出溝４の工具回転方向Ｔを向く上記壁面との周方向の位相がずらされているので、これら第１、第２面取り刃６、７が被削材に食い付く際には、本実施形態ではまず第２面取り刃７が先に食い付き、僅かに遅れて第１面取り刃６が食い付くことになる。 And the phase of the circumferential direction of the said level | step difference surface 5a used as the rake face of these 1st chamfering blade 6, and the said wall surface which faces the tool rotation direction T of the chip discharge groove | channel 4 used as the rake face 5 of the 2nd chamfering blade 7. Therefore, when the first and second chamfering blades 6 and 7 bite into the work material, in the present embodiment, the second chamfering blade 7 bites first and is slightly delayed. The single chamfering blade 6 will bite.

このため、第１、第２面取り刃６、７が同時に被削材に食い付く場合のように瞬間的に大きな切削抵抗が作用することがなく、複数ずつの第１、第２面取り刃６、７が順次食い付くことにより、このような切削抵抗の増大が周期的に繰り返されてビビリ振動が引き起こされることもない。従って、上記構成の面取り工具によれば、このようにビビリ振動を防ぐことにより、円滑で効率的な面取り加工を行うことができる。 For this reason, a large cutting resistance does not act instantaneously as in the case where the first and second chamfering blades 6 and 7 simultaneously bite the work material, and a plurality of first and second chamfering blades 6 and 6 By sequentially biting 7, such an increase in cutting resistance is periodically repeated, and chatter vibration is not caused. Therefore, according to the chamfering tool having the above-described configuration, smooth and efficient chamfering can be performed by preventing chatter vibration.

なお、本実施形態では、第１面取り刃６のすくい面となる上記段差面５ａと、第２面取り刃７のすくい面５となる切屑排出溝４の工具回転方向Ｔを向く上記壁面とが、ともに軸線Ｏを含む平面上に位置しているが、これらのうち少なくとも一方は、軸線Ｏを含まずに該軸線Ｏに平行な平面上に位置していて、その外周縁部に形成される第１、第２面取り刃６、７の少なくとも一方の径方向すくい角が０°ではない正角または負角とされていてもよい。 In the present embodiment, the step surface 5a serving as the rake face of the first chamfering blade 6 and the wall surface facing the tool rotation direction T of the chip discharge groove 4 serving as the rake face 5 of the second chamfering blade 7 are: Both of them are located on a plane including the axis O, but at least one of them is located on a plane parallel to the axis O without including the axis O, and is formed on the outer peripheral edge portion thereof. The rake angle in the radial direction of at least one of the first and second chamfering blades 6 and 7 may be a positive angle or a negative angle other than 0 °.

また、本実施形態では、被削材に形成された貫通孔の両開口部や板状部の周縁に面取り加工を施す場合において、工具本体１の切刃部３の外周逃げ面８が等脚台形状に切り欠かれて、この切刃部３の先端側に工具本体１の後端側に向かうに従い直線状に内周側に向かう第１面取り刃６が設けられるとともに、切刃部３の後端側には工具本体１の後端側に向かうに従い直線状に外周側に向かう第２面取り刃７が設けられている面取り工具について説明したが、本発明の面取り工具は、例えば被削材の側面に形成された凹溝の両溝壁と被削材の側面との交差稜線部に面取りを施す面取り工具に適用することも可能である。 Moreover, in this embodiment, when chamfering is performed on both openings of the through-holes formed in the work material and the periphery of the plate-like portion, the outer peripheral flank 8 of the cutting edge portion 3 of the tool body 1 is an isometric leg. A first chamfering blade 6 that is notched in a trapezoidal shape and that is linearly directed toward the inner peripheral side toward the rear end side of the tool main body 1 is provided on the front end side of the cutting blade portion 3. Although the chamfering tool in which the second chamfering blade 7 linearly extending toward the outer peripheral side toward the rear end side of the tool body 1 is provided on the rear end side has been described, the chamfering tool of the present invention is, for example, a work material It is also possible to apply to a chamfering tool that chamfers the intersecting ridge line portion between both groove walls of the concave groove formed on the side surface of the workpiece and the side surface of the work material.

このような場合には、工具本体１の先端部に算盤の駒形、あるいは軸線Ｏに沿った断面が外周側に等脚台形状に突出する切刃部３を形成し、この切刃部３の斜辺部分に周方向の位相をずらして第１、第２面取り刃６、７を設ければよい。従って、この場合には、工具本体１の先端側に、後端側に向かうに従い直線状に外周側に向かう第２面取り刃７が設けられるとともに、この第２面取り刃７の後端側に、工具本体１の後端側に向かうに従い直線状に内周側に向かう第１面取り刃６が設けられることになる。 In such a case, a cutting blade portion 3 having an abacus piece shape or a cross section along the axis O protruding in an isosceles trapezoidal shape on the outer peripheral side is formed at the tip portion of the tool body 1. What is necessary is just to provide the 1st, 2nd chamfering blades 6 and 7 in the hypotenuse part by shifting the phase in the circumferential direction. Therefore, in this case, the second chamfering blade 7 linearly toward the outer peripheral side as it goes toward the rear end side is provided on the front end side of the tool body 1, and on the rear end side of the second chamfering blade 7, The 1st chamfering blade 6 which goes to the inner peripheral side linearly as it goes to the rear end side of the tool body 1 is provided.

さらに、本実施形態では、上述のように本発明をソリッドタイプの面取り工具に適用した場合について説明したが、例えば第１、第２面取り刃６、７が形成される上記等脚台形状に切り欠かれた部分の斜辺部分にそれぞれインサート取付座を形成し、これらのインサート取付座に第１、第２面取り刃６、７と同様に傾斜する切刃を備えた切削インサートを着脱可能に取り付けた、刃先交換式の面取り工具に本発明を適用することも可能である。この場合には、２つのインサート取付座の工具回転方向Ｔを向く底面を同一平面上に形成しても、厚さの異なる切削インサートを取り付けることで容易にすくい面の位相をずらすことができる。 Further, in the present embodiment, the case where the present invention is applied to a solid type chamfering tool as described above has been described, but for example, the first and second chamfering blades 6 and 7 are cut into the above isosceles trapezoidal shape. Insert mounting seats are formed on the oblique sides of the cut-out portions, and cutting inserts having cutting blades that are inclined similarly to the first and second chamfering blades 6 and 7 are detachably attached to these insert mounting seats. It is also possible to apply the present invention to a chamfering tool with a blade tip exchange type. In this case, even if the bottom surfaces of the two insert mounting seats facing the tool rotation direction T are formed on the same plane, the phase of the rake face can be easily shifted by attaching cutting inserts having different thicknesses.

１工具本体
２シャンク部
３切刃部
４切屑排出溝
５第２面取り刃７のすくい面（切屑排出溝４の工具回転方向Ｔを向く壁面）
５ａ段差面（第１面取り刃６のすくい面）
６第１面取り刃
７第２面取り刃
８外周逃げ面
Ｏ工具本体１の軸線
Ｔ工具回転方向 DESCRIPTION OF SYMBOLS 1 Tool main body 2 Shank part 3 Cutting blade part 4 Chip discharge groove 5 Rake face of the 2nd chamfering blade 7 (Wall surface which faces the tool rotation direction T of the chip discharge groove 4)
5a Step surface (rake face of first chamfering blade 6)
6 1st chamfering blade 7 2nd chamfering blade 8 Peripheral flank face O Tool body 1 axis T Tool rotation direction

Claims

軸線回りに回転される工具本体の先端部外周に、上記工具本体の後端側に延びる切屑排出溝が形成され、この切屑排出溝の工具回転方向を向く壁面の外周縁部には、上記工具本体の後端側に向かうに従い直線状に内周側に向かう第１面取り刃と、上記工具本体の後端側に向かうに従い直線状に外周側に向かう第２面取り刃とが設けられ、これら第１面取り刃のすくい面と第２面取り刃のすくい面とは、上記軸線に平行な平面上、または該軸線を含む平面上に位置しているとともに、周方向の位相が互いにずらされていることを特徴とする面取り工具。 A chip discharge groove extending toward the rear end side of the tool body is formed on the outer periphery of the tip of the tool body rotated around the axis, and the tool is disposed on the outer peripheral edge of the wall surface of the chip discharge groove facing the tool rotation direction. A first chamfering blade linearly facing the inner peripheral side as it goes toward the rear end side of the main body, and a second chamfering blade that goes linearly toward the outer peripheral side as it goes toward the rear end side of the tool main body are provided. The rake face of the one chamfering blade and the rake face of the second chamfering blade are located on a plane parallel to the axis or on a plane including the axis, and the phases in the circumferential direction are shifted from each other. Chamfering tool characterized by

上記切屑排出溝の工具回転方向を向く壁面と、この壁面の工具回転方向とは反対側に連なる上記工具本体の外周逃げ面との交差稜線部に、上記第１面取り刃と上記第２面取り刃とが形成されていることを特徴とする請求項１に記載の面取り工具。 The first chamfering blade and the second chamfering blade are formed on a cross ridge line portion between the wall surface of the chip discharge groove facing the tool rotation direction and the outer peripheral flank of the tool body that is connected to the side opposite to the tool rotation direction of the wall surface. The chamfering tool according to claim 1, wherein the chamfering tool is formed.