JPH0642002U - Boring tool - Google Patents
Boring toolInfo
- Publication number
- JPH0642002U JPH0642002U JP7954192U JP7954192U JPH0642002U JP H0642002 U JPH0642002 U JP H0642002U JP 7954192 U JP7954192 U JP 7954192U JP 7954192 U JP7954192 U JP 7954192U JP H0642002 U JPH0642002 U JP H0642002U
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- Prior art keywords
- tool
- shaft portion
- cutting
- boring
- shaft
- 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.)
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- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
(57)【要約】 （修正有）
【目的】 加工時に能率よく高精度の加工ができる中ぐ
り工具を提供する。
【構成】 中ぐり棒１のシャンク部２と刃具６を設けた
頭部４との間に位置する軸部３に、軸部３外周面の軸方
向に沿う細長い平坦面５を、軸部３の４箇所に等しい間
隔を設けて形成し、軸部３の横断面を非円形にした。
【効果】 軸部３の横断面を非円形にしたので、切削加
工中に中ぐり棒１に、回転数に共鳴するびびり振動を加
工領域に生ずることなく、切り込み量を大きくでき、加
工後の切削面の精度がよい。
(57) [Summary] (Correction) [Purpose] To provide a boring tool that enables efficient and high-precision machining during machining. [Structure] On a shaft portion 3 located between a shank portion 2 of a boring bar 1 and a head portion 4 provided with a cutting tool 6, an elongated flat surface 5 along the axial direction of the outer peripheral surface of the shaft portion 3 is provided. 4 were formed at equal intervals and the cross section of the shaft portion 3 was made non-circular. [Effect] Since the cross-section of the shaft portion 3 is made non-circular, the boring bar 1 can have a large cutting depth without causing chatter vibrations that resonate with the rotation speed in the processing region during the cutting process. Good cutting surface accuracy.
Description
この考案は、工作物に所要径の孔を切削加工するための中ぐり工具に関するも のである。 The present invention relates to a boring tool for cutting a hole having a required diameter in a workpiece.
従来、中ぐり工具として、中ぐり棒のシャンク部の先端に所要長さの軸部を介 して頭部を一体に形成し、この頭部にスローアウエイチップなどの刃具を設けた ものが一般に用いられている。 そして、中ぐり工具は、回転軸に対し中ぐり棒が片持式に支持されるため、加 工時に切削力と回転数との関係でびびり振動が生じやすい。 そこで、従来は中ぐり棒の断面円形にした軸部に、先端側が小径となるテーパ ーを設けたり、外周面の軸方向複数箇所に円周溝を設けたり、段を設けたりして 外径を部分的に変える手段を講じ、びびり振動の防止を図っていた。 Conventionally, as a boring tool, generally, a head is integrally formed on the tip of the shank part of the boring bar via a shaft of a required length, and a cutting tool such as a throwaway tip is provided on this head. It is used. Further, in the boring tool, the boring bar is supported in a cantilever manner with respect to the rotating shaft, and therefore chatter vibration is likely to occur during processing due to the relationship between the cutting force and the rotational speed. Therefore, in the past, the shaft with a circular cross section of the boring bar was provided with a taper with a small diameter on the tip side, or circumferential grooves were provided at multiple axial positions on the outer peripheral surface, or steps were provided to provide an outer diameter. To prevent chatter vibration.
しかし、中ぐり棒の軸部にテーパーを設けるなどの前記手段では、びびり振動 を充分に防止できず、とくに、加工時の回転が速いと加工表面にびびりマークが できるので、切り込み量を大きくしたり、回転を速くしたりすることができず、 能率のよい加工ができないという問題点があった。 この考案は、前述した問題点を解決して、切り込み量を大きく、回転を速くし ても、びびり振動が生じにくく、能率よく高精度の加工ができる中ぐり工具を提 供することを目的としている。 However, the above-mentioned means such as providing a taper on the shaft of the boring bar cannot sufficiently prevent chatter vibration.In particular, if the rotation during machining is fast, chatter marks can be made on the machined surface, so the cutting depth should be increased. However, there was a problem in that efficient rotation could not be performed and efficient machining could not be performed. It is an object of the present invention to solve the above-mentioned problems, and to provide a boring tool capable of efficient and high-precision machining with less chatter vibration even if the cutting depth is large and the rotation speed is high. .
この考案の中ぐり工具は、中ぐり棒のシャンク部と刃具を設けた頭部との間に 位置する軸部に、この軸部外周面の軸方向に沿う細長い平坦面を、軸部周方向の １箇所以上に形成し、軸部の横断面を非円形にしたものである。 The boring tool of the present invention has a shaft portion located between the shank portion of the boring bar and the head portion provided with the cutting tool, which has a slender flat surface along the axial direction of the outer peripheral surface of the shaft portion. The cross section of the shaft is made non-circular.
この考案の中ぐり工具は、中ぐり棒の軸部外周面の円周方向の４箇所など１箇 所以上に、軸方向に沿う細長い平坦面を形成し、軸部の横断面を非円形に変形さ せたので、加工時に刃具の刃先にかかる、回転数による振動が工具の固有振動と 共鳴する領域を分散させ、加工域での回転では共鳴振動を発生しにくくでき、切 り込み量が大きく、回転が速い加工をしても、加工表面にびびりマークができず 、したがって加工能率がよく、また加工後の切削面の高精度の加工ができる。 The boring tool of the present invention has elongated flat surfaces along the axial direction formed at one or more locations such as four locations in the circumferential direction on the outer peripheral surface of the boring bar to make the cross section of the shaft section non-circular. Since it has been deformed, the area where the vibration due to the number of rotations that is applied to the cutting edge of the cutting tool resonates with the natural vibration of the tool during machining is dispersed, and resonance vibration is less likely to occur during rotation in the machining area, and the depth of cut is reduced. Even if the machining is large and the rotation is fast, no chatter marks can be made on the machining surface, so the machining efficiency is good, and the machining surface after machining can be machined with high precision.
以下、この考案の実施例につき図を参照して説明する。 図１，図２および図３はこの考案の第１実施例を示す。これらの図において、 １は中ぐり工具の中ぐり棒であり、中ぐり棒１は、ストレートシャンク部２の先 端側に軸部３と頭部４とを軸方向に連続させて一体に設けてある。 軸部３は、前記シャンク部２よりも小外径の横断面円形の部分をシャンク部２ 側に残し、横断面円形の部分の先端側に頭部４の末端まで軸方向に沿って切り欠 くことで、細長い平坦面５を設けてある。平坦面５は軸部３の周方向４箇所に互 いに等しい幅に、互いに等しく狭い間隔で形成し、軸部３の平坦面５を形成した 部分を、正方形の各角部が円形になっている非円形の横断面形状にしてある。 前記頭部４は、２つの平坦面５が挟む円弧状部を中心として切欠いた取付面６ を有し、取付面６に三角形のスローアウエイ式チップからなる刃具７を取付ねじ ８によって着脱可能に締め付け固定してあり、刃具７の各角部に設けた刃部７ａ の１つを頭部４の先端一側から突出させてある。 以上のように構成した中ぐり工具は、中ぐり棒１のシャンク部２を工具ホルダ ーを介して工作機械の主軸などの回転軸に着脱可能に装着し、この回転軸と共に 中ぐり棒１を回転させつつ、回転軸および中ぐり棒１または工作物に中ぐり棒１ の軸方向に沿う送りを与え、中ぐり棒１を頭部４から工作物の孔に入れてその孔 壁を所要切り込み深さで切り込む。 そして、前記刃具７の刃先で、図２の鎖線に示す孔の孔壁を切断する時に、刃 先には３つの分力が発生する。すなわち、主分力Ｆ1 は回転力を受け止めて切削 力とする最も大きな分力であり、背分力Ｆ2 は径方向の切り込み量に応じた分力 であり、送り分力Ｆ3 は図１に示す工具の１回転当りの送り量（進み長さ）に応 じた軸方向分力である。これらの分力Ｆ1 ，Ｆ2 ，Ｆ3 は工具先端に位置する刃 具の刃先にかかる切削力であり、工具は片持ち構造であるため、工具の軸部３な どを曲げる方向に作用する。 この実施例では、前記分力Ｆ1 ，Ｆ2 ，Ｆ3 に対しては曲げ応力に対抗した軸 部３の断面を保ちつつ、軸部３の断面形状を従来の丸断面から菱形の角断面に近 い形状に変形させたことで、刃具７の刃先にかかる、回転数による振動が工具の 固有振動と共鳴する領域を、軸部３の断面を工具の刃先位置に対して所定の形状 に選ぶことで移動させ、加工領域での回転に共鳴振動が発生しないか、発生しに くくすることができ、能率よく高精度の加工ができる。 すなわち、従来の軸部が円形断面の工具では、毎分１２００回転でびびり振動 が生じる時、この実施例の軸部が菱形に近い断面の工具では、毎分２０００回転 させて、加工孔を直径１６mm、切り込み量を0.５mm（直径）、１回転当りの送り を0.０５mmにした場合、加工表面に前記従来のものではびびりマークができたが 、この実施例による工具ではびびりマークができなかった。 したがって、この実施例の工具は、加工時の回転を速くし、工具の軸部３の太 さが従来のものと同様でも、切削力に対して強度が大きく、前述したように、能 率のよい加工ができる。 また、切削に対する強度が大きいので、工具の軸部の長さを長くでき、深さの 深い孔に加工を行うことができる。 図４はこの考案の第２実施例を示し、この実施例では、軸部３の周方向３箇所 に互いに等しい幅と、互いに等しく狭い間隔とで平坦面５を形成し、軸部３の平 坦面５を形成した部分を、正三角形の各頂部が円形になっている非円形の横断面 形状にしてある。図５は前記第２実施例の変形例を示し、この変形例では、軸部 ３を第１実施例の平坦面５を３箇所に減らした非円形の横断面形状にすると共に 、平坦面５間の間隔が大きい部分に対応させて、頭部４に刃具７を設けたもので ある。 図６，図７はこの考案の第３実施例を示し、この実施例は、軸部３の先端部か ら頭部４の軸部３寄り部分までを若干大径とし、頭部４にスローアウエイ式の円 形チップからなる刃具７を着脱可能に固定したボールエンド中ぐり工具である。 図８，図９はこの考案の第４実施例を示し、この実施例は、頭部４にスローア ウエイ式の平行四辺形チップからなる２枚の刃具７を着脱可能に固定した２枚刃 中ぐり工具である。 図１０，図１１はこの考案の第５実施例を示し、この実施例は、頭部４にスロ ーアウエイ式のボールエンドチップからなる２枚の刃具７を着脱可能に固定した ２枚刃中ぐり工具である。そして、この実施例による工具は、マシニングセンタ などのＣＮＣ制御によるフライス加工の場合に、図１０に例示するように、金型 などの工作物９に曲線加工を施すと、１枚の刃具７の刃先で加工していることが 多く、取り代の変動が大きく、コーナ部の加工時などに、従来の工具では急激に びびり振動が生じ、刃先に損傷しやすいが、第５実施例のものは軸部３に平坦部 ５が形成してあるので、びびり振動を防止でき、刃先が損傷しにくい。 なお、第２実施例ないし第５実施例の前述した以外の構成は、第１実施例とほ ぼ同様であり、図４ないし図１１の各図において、図１，図２，図３と同符号は 対応する部分を示す。 この考案において、中ぐり棒のシャンク部は前記各実施例のストレートシャン ク部に限られることなく、テーパーシャンク部など、従来公知の各シャンク部を 適用でき、また中ぐり棒の頭部の構成および頭部に設ける刃具の形状、材質、固 定手段も前記各実施例のものに限られることなく適宜変更できる。 そして、この考案は、シャンク部および軸部の長手方向に沿いこれらの中心部 に超硬金属棒を挿入した工具にも適用でき、工具を回転させずに工作物を回転さ せて加工を行うこともできる。 さらに、この考案において、中ぐり棒の軸部はシャンク部および頭部の基準外 径より小外径にしてもよく、軸部に設ける平坦部は、４箇所，３箇所に限られる ことなく、２箇所，１箇所など１ないし数箇所であればよく、平坦部の長さおよ び幅も適宜変更できるが、平坦部の大きさおよび切り欠き深さをあまり小さくす ると、びびり振動の防止が充分にできない。An embodiment of the present invention will be described below with reference to the drawings. 1, 2 and 3 show a first embodiment of the present invention. In these drawings, 1 is a boring bar of a boring tool, and the boring bar 1 has a shaft 3 and a head 4 which are integrally provided on the front end side of a straight shank 2 so as to be continuous in the axial direction. There is. The shaft portion 3 has a portion having a smaller outer diameter than that of the shank portion 2 and having a circular cross section left on the shank portion 2 side, and is cut out along the axial direction to the end of the head 4 at the tip end side of the circular cross section portion. By doing so, an elongated flat surface 5 is provided. The flat surface 5 is formed in four circumferential positions of the shaft portion 3 at equal widths and at equal narrow intervals, and each of the square portions has a circular shape. It has a non-circular cross section. The head 4 has a mounting surface 6 which is cut out around an arcuate portion sandwiched by two flat surfaces 5, and a cutting tool 7 made of a triangular throwaway type tip can be attached to and detached from the mounting surface 6 by a mounting screw 8. It is fixed by tightening, and one of the blade portions 7a provided at each corner of the blade 7 is projected from one side of the tip of the head 4. In the boring tool configured as described above, the shank portion 2 of the boring bar 1 is detachably attached to the rotary shaft such as the main shaft of the machine tool via the tool holder, and the boring bar 1 is attached together with the rotary shaft. While rotating, the rotary shaft and the boring bar 1 or the workpiece is fed along the axial direction of the boring bar 1, the boring bar 1 is inserted from the head 4 into the hole of the workpiece, and the wall of the hole is cut as required. Cut at a depth. When the cutting edge of the cutting tool 7 cuts the hole wall of the hole shown by the chain line in FIG. 2, three component forces are generated at the cutting edge. That is, the main component force F 1 is the largest component force that receives the rotational force and becomes the cutting force, the back component force F 2 is the component force corresponding to the cutting amount in the radial direction, and the feed component force F 3 is It is the axial component force corresponding to the feed amount (advance length) per revolution of the tool shown in 1. These component forces F 1 , F 2 and F 3 are the cutting forces applied to the cutting edge of the cutting tool located at the tip of the tool. Since the tool has a cantilever structure, it acts in the bending direction of the tool shaft 3 etc. To do. In this embodiment, the cross section of the shaft portion 3 is changed from the conventional round cross section to the rhombic square cross section while maintaining the cross section of the shaft section 3 against the bending stress against the component forces F 1 , F 2 and F 3 . By transforming it into a shape close to, the area where the vibration applied to the cutting edge of the cutting tool 7 resonates with the natural vibration of the tool, the cross section of the shaft part 3 is made into a predetermined shape with respect to the cutting edge position of the tool. It can be moved by selection so that resonance vibration does not occur or hardly occurs during rotation in the machining area, and efficient and highly accurate machining is possible. That is, when chatter vibration occurs at 1200 revolutions per minute with a conventional tool having a circular cross section, the tool having a cross section with a nearly rhombic shaft in this embodiment is rotated at 2000 revolutions per minute to form a drilled hole with a diameter of When the cutting depth was 16 mm, the depth of cut was 0.5 mm (diameter), and the feed per rotation was 0.05 mm, chatter marks could be made on the machined surface with the above-mentioned conventional tool, but chatter marks could be made with the tool according to this embodiment. There wasn't. Therefore, the tool of this embodiment has a high rotation speed during machining, and has a large strength against the cutting force even if the shaft portion 3 of the tool has the same thickness as the conventional one. Good processing is possible. Moreover, since the strength against cutting is great, the length of the shaft portion of the tool can be increased, and a hole having a deep depth can be machined. FIG. 4 shows a second embodiment of the present invention. In this embodiment, flat surfaces 5 are formed at three positions in the circumferential direction of the shaft portion 3 with equal widths and with equal narrow intervals, and the flat surface of the shaft portion 3 is formed. The portion where the carrier surface 5 is formed has a non-circular cross-sectional shape in which each vertex of the equilateral triangle is circular. FIG. 5 shows a modification of the second embodiment. In this modification, the shaft portion 3 has a non-circular cross-sectional shape in which the flat surface 5 of the first embodiment is reduced to three places, and the flat surface 5 A blade 7 is provided on the head 4 in correspondence with a portion having a large interval. 6 and 7 show a third embodiment of the present invention. In this embodiment, the diameter from the tip of the shaft 3 to the portion of the head 4 near the shaft 3 is slightly increased, and the head 4 is thrown. This is a ball end boring tool to which a cutting tool 7 composed of an away type circular tip is detachably fixed. 8 and 9 show a fourth embodiment of the present invention. This embodiment is a two-blade in which two cutting tools 7 made of a throwaway parallelogram tip are detachably fixed to a head 4. It is a boring tool. 10 and 11 show a fifth embodiment of the present invention, which is a two-blade boring in which two cutting tools 7 composed of a throw-away type ball end tip are detachably fixed to a head 4. It is a tool. The tool according to this embodiment, when performing milling by CNC control such as a machining center, as shown in FIG. In many cases, the machining allowance fluctuates greatly, and during machining of the corners, conventional tools suddenly generate chatter vibration, which easily damages the cutting edge. Since the flat portion 5 is formed on the portion 3, chatter vibration can be prevented and the blade edge is less likely to be damaged. The configurations of the second to fifth embodiments other than those described above are almost the same as those of the first embodiment. In each of FIGS. 4 to 11, the same configurations as in FIGS. 1, 2 and 3 are used. Symbols indicate corresponding parts. In the present invention, the shank portion of the boring bar is not limited to the straight shank portion of each of the above-mentioned embodiments, and any conventionally known shank portion such as a taper shank portion can be applied, and the boring bar head configuration can be applied. Also, the shape, material, and fixing means of the cutting tool provided on the head are not limited to those in the above-mentioned embodiments, but can be changed as appropriate. Further, the present invention can be applied to a tool in which a cemented carbide rod is inserted in the central portion of the shank portion and the shaft portion along the longitudinal direction of the shank portion and the shaft portion, and the workpiece is rotated without rotating the tool for machining. You can also Further, in this invention, the shaft portion of the boring bar may have an outer diameter smaller than the reference outer diameter of the shank portion and the head portion, and the flat portions provided on the shaft portion are not limited to four and three locations. The length and width of the flat part can be changed as appropriate, as long as the length and width of the flat part can be changed appropriately. However, if the size of the flat part and the notch depth are made too small, chatter vibration will occur. It cannot prevent enough.
以上説明したように、この考案の中ぐり工具は、中ぐり棒のシャンク部と刃具 を設けた頭部との間に位置する軸部に、この軸部外周面の軸方向に沿う細長い平 坦面を、軸部周方向の１箇所以上に形成し、軸部の横断面を非円形にしたので次 の結果が得られる。 すなわち、この考案の中ぐり工具は、中ぐり棒の軸部外周面の円周方向の４箇 所など１箇所以上に、軸方向に沿う細長い平坦面を形成し、軸部の横断面を非円 形に変形させたので、加工時に刃具の刃先にかかる、回転数による振動が工具の 固有振動と共鳴する領域を分散させ、加工域での回転では共鳴振動を発生しにく くでき、切り込み量が大きく、回転が速い加工をしても、加工表面にびびりマー クができず、したがって加工能率がよく、また加工後の切削面の高精度の加工が できる。 As described above, the boring tool of the present invention has a slender flat carrier along the axial direction of the outer peripheral surface of the shaft, which is located between the shank portion of the boring bar and the head provided with the cutting tool. Since the surface is formed at one or more locations in the circumferential direction of the shank and the cross section of the shank is made non-circular, the following results are obtained. That is, in the boring tool of the present invention, an elongated flat surface along the axial direction is formed at one or more places such as four positions in the circumferential direction on the outer peripheral surface of the shaft of the boring bar, and the cross section of the shaft is made non-uniform. Since it is deformed into a circular shape, the region where the vibration applied to the cutting edge of the cutting tool at the time of machining resonates with the natural vibration of the tool is dispersed, and resonance vibration is less likely to occur during rotation in the machining range, making it possible to cut. Even if machining is performed with a large amount and rotation is fast, chatter marks cannot be generated on the machined surface, so machining efficiency is good, and the machined surface after machining can be machined with high precision.
【図１】この考案の第１実施例による中ぐり工具を示し
た平面図FIG. 1 is a plan view showing a boring tool according to a first embodiment of the present invention.
【図２】図１の中ぐり工具を示した正面図FIG. 2 is a front view showing the boring tool shown in FIG.
【図３】図１のＡーＡ線断面図FIG. 3 is a sectional view taken along the line AA of FIG.
【図４】この考案の第２実施例による中ぐり工具を示し
た軸部の横断面図FIG. 4 is a cross-sectional view of a shaft portion showing a boring tool according to a second embodiment of the present invention.
【図５】この考案の第２実施例による中ぐり工具の変形
例を示した横断説明図FIG. 5 is a transverse explanatory view showing a modification of the boring tool according to the second embodiment of the present invention.
【図６】この考案の第３実施例による中ぐり工具を示し
平面図FIG. 6 is a plan view showing a boring tool according to a third embodiment of the present invention.
【図７】図６の中ぐり工具を示した正面図FIG. 7 is a front view showing the boring tool shown in FIG. 6;
【図８】この考案の第４実施例による中ぐり工具を示し
平面図FIG. 8 is a plan view showing a boring tool according to a fourth embodiment of the present invention.
【図９】図８の中ぐり工具を示した正面図9 is a front view showing the boring tool shown in FIG. 8;
【図１０】この考案の第５実施例による中ぐり工具を示
し正面図FIG. 10 is a front view showing a boring tool according to a fifth embodiment of the present invention.
【図１１】図１０の中ぐり工具を示した底面図FIG. 11 is a bottom view showing the boring tool of FIG. 10.
１ 中ぐり棒 ２ シャンク部 ３ 軸部 ４ 頭部 ５ 平坦部 ７ 刃具 1 Boring bar 2 Shank part 3 Shaft part 4 Head part 5 Flat part 7 Cutting tool
Claims (1)
部との間に位置する軸部に、この軸部外周面の軸方向に
沿う細長い平坦面を、軸部周方向の１箇所以上に形成
し、軸部の横断面を非円形にしたことを特徴とする中ぐ
り工具。1. A shaft portion located between a shank portion of a boring bar and a head portion provided with a cutting tool is provided with an elongated flat surface along an axial direction of an outer peripheral surface of the shaft portion at one position in a circumferential direction of the shaft portion. A boring tool formed as described above and having a non-circular cross section of the shaft portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7954192U JP2602377Y2 (en) | 1992-11-18 | 1992-11-18 | Boring tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7954192U JP2602377Y2 (en) | 1992-11-18 | 1992-11-18 | Boring tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0642002U true JPH0642002U (en) | 1994-06-03 |
| JP2602377Y2 JP2602377Y2 (en) | 2000-01-11 |
Family
ID=13692863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7954192U Expired - Fee Related JP2602377Y2 (en) | 1992-11-18 | 1992-11-18 | Boring tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2602377Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005246500A (en) * | 2004-03-01 | 2005-09-15 | Denso Corp | Cutting method |
-
1992
- 1992-11-18 JP JP7954192U patent/JP2602377Y2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005246500A (en) * | 2004-03-01 | 2005-09-15 | Denso Corp | Cutting method |
| JP4656371B2 (en) * | 2004-03-01 | 2011-03-23 | 株式会社デンソー | Cutting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2602377Y2 (en) | 2000-01-11 |
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