JP3825306B2

JP3825306B2 - Throw-away tool for grooving

Info

Publication number: JP3825306B2
Application number: JP2001359377A
Authority: JP
Inventors: 平川崎; 清忠高柳
Original assignee: Kyocera Corp
Current assignee: Kyocera Corp
Priority date: 2001-11-26
Filing date: 2001-11-26
Publication date: 2006-09-27
Anticipated expiration: 2021-11-26
Also published as: JP2003159604A

Description

【０００１】
【発明が属する技術分野】
本発明は、両端に配設された切刃を交互に使用して被削材に溝入れ加工を行うスローアウェイ式工具に関する。
【０００２】
【従来の技術】
従来より、ホルダの先端からチップの切刃を突出させて固定した構造の溝入れ用スローアウェイ式工具が知られている。かかる溝入れ式スローアウェイ式工具は、図３（ａ）に示すように、先端および奥端の２コーナーに切刃２１ａ、２１ｂを形成したチップ２２をチップホルダ２３に取着して固定するものであるが、一方の刃先２１ａに欠けが発生した場合、図３（ｂ）に示すようにチップ２２を前後逆にして他端の切刃２１ｂをセットすると、欠損した切刃２１ａの欠損の程度によって切刃２１ｂの位置がずれてしまい、切削深さが変化したりチップ２２の固定状態が不安定となるという問題があった。
【０００３】
そこで、実開平４−１１２７０６号公報では、ホルダチップ取付座に凹部を形成して該凹部に挿入される凸状部をその着座面に有するチップを装着することが開示され、一方の切刃が欠損した場合においても、他端の切刃の取付位置が変わることなくチップを正確に取り付けることができることが記載されている。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記実開平４−１１２７０６号公報のようにチップの着座面に凸状部を形成した溝入れ用スローアウェイ式工具では、欠損した切刃とは反対位置の切刃の先端長さ精度を向上させることはできるものの、チップの着座面が凸状部を有する複雑な形状になるために、チップの位置決め基準となる基準面（チップ取付座と当接する着座面）の形状を精密に制御して形成することができず、特に溝入れ加工の加工径が小さくなるような場合には、切刃の前（厚み）方向の位置精度が低下したり、チップ取付座へのチップの座りが悪くなって微妙ながたつきが生じてビビリ振動等の不具合が発生し、しかも、同号公報のホルダではチップ上面をクランプ駒にて局所的に固定することから、特に上下方向への振動が大きいという問題があった。
【０００５】
また、上記チップでは、より小径の溝入れ加工に対しては、チップ先端を支持するホルダ先端部分（下あご部）がワーク（被削材）に接触してしまい、加工可能な溝径が限られ、さらに、チップの刃先（先端）形状を先細させたような多様なチップ形状に対応できないものであった。
【０００６】
本発明は、上記課題を解決するためになされたもので、その目的は、チップ切刃の位置精度を高めて精密加工が可能であり、かつビビリ振動等を抑制することができるとともに、先端形状によらず多様な形状のチップを保持できるホルダを備えた溝入れ用スローアウェイ式工具を提供することにある。
【０００７】
【課題を解決するための手段】
本発明者らは、上記課題に対して検討した結果、ホルダの先端に該ホルダの長手方向に延びるチップ取付部を配設し、該チップ取付部にチップを装着して該チップを上面から押圧して固定する溝入れ用スローアウェイ式工具において、前記チップ取付部は、前記ホルダの長手方向に沿って延在する下着座面と、該下着座面に対して立設するとともに前記ホルダの長手方向に沿って延在した平坦面からなる後着座面と、を有し、該後着座面の前記ホルダ長手方向の奥側の端部に隣接し且つ先端側に突出する段差を備え、前記チップは、該チップの幅方向に延びる仮想中心線に対し互いに回転対称な位置それぞれに、前記後着座面の前記段差と嵌合する切り欠きと、該切り欠かれたチップの先端に切刃と、を備えており、前記チップを、該チップの切り欠かれた先端が前記ホルダの先端よりも先へ突出するように前記チップ取付部へ装着して、前記チップ取付部の下着座面と後着座面、および前記チップの上面を覆うように前記ホルダに一体的に設けられたクランプ板にて該チップを固定するとともに、前記下着座面、前記後着座面および前記クランプ板の各々に対して垂直な仮想平面におけるチップ取付部の断面形状が、前記後着座面を下底とした台形形状からなることによって、チップ切刃の先端および前端の位置精度を高めて精密加工が可能となり、一方の切刃が欠損する等により他方の切刃に装着し直す際にも寸法精度よくチップを装着でき、さらに、ビビリ振動の発生を抑制できるとともに、微細加工ができ、かつチップの先端形状によらず多様なチップを保持可能なチップホルダを備え、特に小径の溝入れ加工が容易にできる溝入れ用スローアウェイ式工具となることを知見した。
【００１０】
【発明の実施の形態】
本発明の溝入れ用スローアウェイ式工具について、その一実施形態を示す図１（ａ）横断面図、（ｂ）縦断面図、（ｃ）側面図を基に説明する。
【００１１】
図１によれば、スローアウェイ式工具１は、ホルダ２の先端に下着座面３Ａおよび後着座面３Ｂを有して長手方向に延びるチップ取付部３（３Ａ、３Ｂ）を配設し、チップ取付部３にチップ４を載置してチップ４の上面を覆うようにホルダ２と一体的に設けられたクランプ板５にてチップ４を固定した構成からなる。
【００１２】
本発明によれば、チップ取付部３のホルダの長手方向に沿って延在した後着座面３Ｂが平坦面からなり、該後着座面３Ｂのホルダ長手方向の奥側の端部に隣接し且つ先端側に突出する段差７を備えるとともに、チップ４の幅方向に延びる仮想中心線４Ａに対し互いに回転対称な位置それぞれには、後着座面３Ｂの段差７と嵌合する切り欠き８ａ、８ｂと、該切り欠かれたチップ４の先端９ａ，９ｂに切刃１０ａ、１０ｂが設けられており、チップ４は後着座面３Ｂおよび段差７によって後端および奥端方向に固定されている。
【００１３】
これによって、チップ４の一方の切刃１０ａが欠損した時、切刃１０ｂを切刃として装着する場合においても欠損した切刃１０ａの形状によらずチップ４を高精度で固定でき、かつチップ４の取付精度、特にチップ４の上下方向への取付位置精度が向上し、加工精度が向上する。特に、チップ４の切り欠かれた先端９ａの長さＬ₁が３ｍｍ以上と長い場合においても切刃１０ａ（およびチップ４を逆向きに取り付けた際の切刃１０ｂ）の取付位置が狂うことなく正確に設定でき、精密加工が可能となる。なお、後着座面３Ｂの長さＬ２はチップを強固に固定する点で１０〜２０ｍｍであることが望ましい。
【００１４】
ここで、上記構成によれば、チップ４の位置決めは段差７とチップ４の切り欠き８ｂとが嵌合して、後着座面３Ｂと段差７により決められ、チップ４の奥端側の切刃１０ｂと、ホルダ２の奥端面２Ｃは必ずしも接触する必要はなく、離間していてもよい。
【００１５】
また、チップ４の切り欠かれた先端９ａ、９ｂは、ホルダ２の先端２Ａよりも先へ突出するように固定されており、すなわち、従来チップ先端を支持するために設けられたホルダ２のいわゆる下あご部が無い形状であることから、下あご部が被削材（図示せず）に接触することなく微細な溝加工を施すことが可能である。
【００１６】
さらに、図１（ｂ）に示すように、本発明によれば、ホルダ２のチップ取付部３の下着座面３Ａ、後着座面３Ｂ、およびホルダ２と一体的に設けられ、チップ４の上面を覆うように形成されたクランプ板５とで囲まれるチップ取付部３の縦断面形状が、前記後着座面を下底とした台形形状をなしている、すなわち、クランプ板５と下着座面３Ａ間の幅が後着座面３Ｂ側に向かって広くなる形状からなるために、チップ４が後着座面３Ｂに強固に固定されビビリ振動等を抑制して精密な加工を行うことができる。
【００１７】
また、チップ４については、ホルダ２の後着座面３Ｂに取着される後側面１３ｂおよび該後側面１３ｂと対向する前側面１３ａとを研磨面とすることが望ましく、これによって、チップ４の切刃１０ａの寸法精度を高めることができる。本発明によれば、後側面１３ｂおよび前側面１３ａは先に突出した部分のないフラット面であるために容易に研磨することができ、より正確な寸法精度に制御することができる。
【００１８】
なお、微細で深い溝加工を行う上では、チップ４の切り欠かれた先端９ａの突出長さＬ₁が３ｍｍ以上、特に３〜１０ｍｍであることが望ましく、さらに、チップ４をより強固に支持、固定するためには、前記チップの全長が２５〜５０ｍｍであることが望ましい。
【００１９】
さらに、本発明によれば、図１の構成に限定されるものではなく、例えば、チップ４の切り欠かれた先端９ａ、９ｂは四角柱であるが、ホルダ２の下あご部が存在しないことから、本発明の溝入れ用スローアウェイ式工具の他の一例についての概略縦断面図である図２に記載されるように、（ａ）一端を切り欠く、（ｂ）両端を切り欠くような先細りした形状等が可能であり設計の自由度が増す。
【００２０】
また、段差７は後着座面３Ｂとのなす角θが、９０°＜θ≦９４°であってもよく、または段差７の先端部７ａがＲ形状であってもよいが、チップ装着時の寸法精度を高め、かつ強固に保持する点では、θ＝９０°で、先端部７ａが角をなすことが望ましい。
【００２１】
【発明の効果】
以上詳述したように、本発明の溝入れ用スローアウェイ式工具によれば、ホルダの先端に長手方向に延びるチップ取付部を配設し、該チップ取付部にチップを載置して該チップの上面を覆うように前記ホルダと一体的に設けられたクランプ板にて前記チップを固定する構造において、前記チップ取付部の前記後着座面の奥側の端部に隣接し且つ先端側に突出する段差が設けられるとともに、前記チップの幅方向に延びる仮想中心線に対し互いに回転対称な位置それぞれに、前記後着座面の前記段差と嵌合する切り欠きと該切り欠きの先端に切刃が設けられ、前記チップの切り欠かれた先端が前記ホルダの先端よりも先へ突出するように固定されているとともに、前記下着座面、前記後着座面および前記クランプ板の各々に対して垂直な仮想平面におけるチップ取付部の断面形状が、前記後着座面を下底とした台形形状からなることによって、チップ切刃の先端および前端の位置精度を高めて精密加工が可能となり、ビビリ振動の発生を抑制できるとともに、微細加工ができ、かつチップの先端形状によらず多様なチップを保持可能なチップホルダを備え、特に小径の溝入れ加工が容易にできる溝入れ用スローアウェイ式工具となる。
【図面の簡単な説明】
【図１】本発明の溝入れ用スローアウェイ式工具の一実施形態を示す（ａ）横断面図、（ｂ）縦断面図、（ｃ）側面図である。
【図２】本発明の溝入れ用スローアウェイ式工具の他の実施形態を示す横断面図である。
【図３】従来の溝入れ用スローアウェイ式工具を示す図であり、（ａ）は側面図、（ｂ）は（ａ）の溝入れ用スローアウェイ式工具の切刃を入れ替えた場合の側面図である。
【符号の説明】
１溝入れ用スローアウェイ式工具
２ホルダ
３チップ取付部
３Ａ下着座面
３Ｂ後着座面
４チップ
４Ａ中心軸
５クランプ板
７段差
７ａ段差の先端部
８（８ａ，８ｂ）切り欠き
９（９ａ、９ｂ）切り欠かれた先端
１０（１０ａ，１０ｂ）切刃
１３ａチップの前側面
１３ｂチップの後側面
チップの全長（前側面の長さ）Ｌ
チップの切り欠かれた先端の突出長さＬ₁
チップの後側面の長さＬ₂ [0001]
[Technical field to which the invention belongs]
The present invention relates to a throw-away tool that performs grooving on a work material by alternately using cutting blades disposed at both ends.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a grooving throw-away tool having a structure in which a cutting edge of a tip is protruded and fixed from the tip of a holder is known. As shown in FIG. 3A, the grooving type throw-away tool attaches and fixes to a chip holder 23 a chip 22 having cutting edges 21a and 21b formed at two corners at the front and back ends. However, when chipping occurs in one of the blade edges 21a, when the tip 22 is reversed and the cutting blade 21b at the other end is set as shown in FIG. As a result, the position of the cutting edge 21b is displaced, and there is a problem that the cutting depth changes or the fixed state of the chip 22 becomes unstable.
[0003]
Therefore, Japanese Utility Model Laid-Open No. 4-112706 discloses that a concave portion is formed in a holder chip mounting seat and a chip having a convex portion to be inserted into the concave portion is mounted on the seating surface. It is described that even when the chip is missing, the chip can be mounted accurately without changing the mounting position of the cutting blade at the other end.
[0004]
[Problems to be solved by the invention]
However, in the throw-away tool for grooving in which a convex portion is formed on the seating surface of the chip as in the above Japanese Utility Model Publication No. 4-112706, the tip length accuracy of the cutting edge at the position opposite to the missing cutting edge is improved. Although it can be improved, since the seating surface of the chip has a complicated shape with a convex portion, the shape of the reference surface (the seating surface that comes into contact with the chip mounting seat) serving as the chip positioning reference is precisely controlled. In particular, when the diameter of the grooving process is small, the positional accuracy in the front (thickness) direction of the cutting blade is reduced, or the chip does not sit properly on the chip mounting seat. As a result, subtle rattling occurs and problems such as chatter vibration occur. In addition, the holder of the same publication locally fixes the top surface of the chip with a clamp piece, so vibration in the vertical direction is particularly large. There is a problem It was.
[0005]
In addition, with the above-mentioned insert, for smaller grooving, the tip of the holder (lower jaw) that supports the tip of the tip comes into contact with the workpiece (work material), and the groove diameter that can be processed is limited. In addition, it cannot cope with various tip shapes such as a tapered tip (tip) shape.
[0006]
The present invention has been made in order to solve the above-mentioned problems, and its purpose is to increase the position accuracy of the tip cutting blade and to perform precision machining, and to suppress chatter vibration and the like, and the tip shape. Accordingly, it is an object of the present invention to provide a grooving throw-away tool including a holder that can hold chips having various shapes.
[0007]
[Means for Solving the Problems]
As a result of studying the above problems, the present inventors have arranged a tip attachment portion extending in the longitudinal direction of the holder at the tip of the holder , and attached the tip to the tip attachment portion and pressed the tip from the upper surface. In the throw-away tool for grooving to be fixed, the tip mounting portion is provided with a lower seating surface extending along the longitudinal direction of the holder, and standing with respect to the lower seating surface and the length of the holder. anda seating surface after consisting a flat surface extending along the direction, comprising a step which projects adjacent to and distal end to the holder longitudinal end of the rear side of the rear seat surface, said chip A notch that fits with the step of the rear seating surface at each rotationally symmetrical position with respect to a virtual center line extending in the width direction of the tip , and a cutting edge at the tip of the notched tip , includes a said chip, said chip Wherein as notched tip to protrude ahead tip of the holder by mounting the chip mounting portion, said to cover the undergarment seat surface and a rear seating surface of the chip mounting portion, and the upper surface of the chip The chip is fixed by a clamp plate provided integrally with the holder, and the cross-sectional shape of the chip mounting portion in a virtual plane perpendicular to each of the lower seating surface, the rear seating surface and the clamp plate is: Due to the trapezoidal shape with the rear seating surface as the bottom, it is possible to perform precision machining by increasing the positional accuracy of the tip and front edges of the chip cutting blade. Chips can be mounted with high dimensional accuracy when reworking, and further, generation of chatter vibration can be suppressed, fine processing can be performed, and various chips can be held regardless of the tip shape of the chip Comprising a holder was found that the indexable tool grooving particularly can be easily small-diameter grooving.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A throw-away tool for grooving according to the present invention will be described with reference to FIG. 1 (a) transverse sectional view, (b) longitudinal sectional view, and (c) side view showing an embodiment thereof.
[0011]
According to FIG. 1, the throw-away tool 1 has a tip mounting portion 3 (3A, 3B) having a lower seating surface 3A and a rear seating surface 3B extending in the longitudinal direction at the tip of a holder 2, The chip 4 is mounted on the mounting portion 3 and the chip 4 is fixed by a clamp plate 5 provided integrally with the holder 2 so as to cover the upper surface of the chip 4.
[0012]
According to the present invention, the rear seating surface 3B extending along the longitudinal direction of the holder of the chip mounting portion 3 is a flat surface, adjacent to the end of the rear seating surface 3B in the longitudinal direction of the holder and Notches 8a and 8b fitted with the step 7 of the rear seating surface 3B are provided at respective positions symmetrical to each other with respect to the virtual center line 4A extending in the width direction of the chip 4 and provided with a step 7 protruding to the front end side. Cutting edges 10a and 10b are provided at the leading ends 9a and 9b of the notched tip 4, and the tip 4 is fixed in the rear end and rear end directions by the rear seating surface 3B and the step 7.
[0013]
As a result, when one of the cutting edges 10a of the tip 4 is lost, the tip 4 can be fixed with high accuracy regardless of the shape of the missing cutting edge 10a even when the cutting edge 10b is mounted as a cutting edge. Mounting accuracy, in particular, the mounting position accuracy in the vertical direction of the chip 4 is improved, and the processing accuracy is improved. In particular, without mounting position of the cutting edge 10a even if the length L ₁ of the notched tip 9a of the tip 4 is 3mm or more and a long (and the cutting edge 10b at the time of mounting the chip 4 in the opposite direction) is mad It can be set accurately and enables precision machining. The length L2 of the rear seating surface 3B is preferably 10 to 20 mm in order to firmly fix the chip.
[0014]
Here, according to the above configuration, the positioning of the tip 4 is determined by the step 7 and the notch 8b of the tip 4 being fitted, and is determined by the rear seating surface 3B and the step 7, and the cutting edge on the back end side of the tip 4 10b and the back end surface 2C of the holder 2 are not necessarily in contact with each other, and may be separated from each other.
[0015]
Further, the notched tips 9a and 9b of the chip 4 are fixed so as to protrude further than the tip 2A of the holder 2, that is, the so-called holder 2 provided to support the tip of the conventional chip. Since the lower jaw portion has no shape, the lower jaw portion can be subjected to fine groove processing without contacting the work material (not shown).
[0016]
Furthermore, as shown in FIG. 1B , according to the present invention, the lower seating surface 3A, the rear seating surface 3B, and the holder 2 of the chip mounting portion 3 of the holder 2 are provided integrally with the upper surface of the chip 4. the longitudinal sectional shape of the tip mounting portion 3 surrounded by the formed the clamping plate 5 so as to cover has a trapezoidal shape that the rear seating surface and a lower bottom, i.e., clamp plate 5 and the undergarment seat surface Since the width between 3A becomes wider toward the rear seating surface 3B side, the chip 4 is firmly fixed to the rear seating surface 3B, and chatter vibration and the like can be suppressed to perform precise processing.
[0017]
In addition, for the chip 4, it is desirable that the rear side surface 13b attached to the rear seating surface 3B of the holder 2 and the front side surface 13a facing the rear side surface 13b be polished surfaces. The dimensional accuracy of the blade 10a can be increased. According to the present invention, since the rear side surface 13b and the front side surface 13a are flat surfaces having no protruding portion, the rear side surface 13b and the front side surface 13a can be easily polished and can be controlled with more accurate dimensional accuracy.
[0018]
Incidentally, in performing a deep grooving fine, the chips 4 of notched tip 9a protruding length L ₁ is 3mm or more, it is desirable in particular 3 to 10 mm, further more firmly supporting the chip 4 In order to fix, it is desirable that the total length of the chip is 25-50 mm.
[0019]
Furthermore, according to the present invention, the configuration is not limited to the configuration shown in FIG. 1. For example, the notched tips 9 a and 9 b of the chip 4 are square pillars, but the lower jaw portion of the holder 2 does not exist. From FIG. 2, which is a schematic longitudinal sectional view of another example of the grooving throw-away tool according to the present invention, (a) cut out one end and (b) cut out both ends. Tapered shapes are possible, increasing design freedom.
[0020]
Further, the angle θ between the step 7 and the rear seating surface 3B may be 90 ° <θ ≦ 94 °, or the tip 7a of the step 7 may be R-shaped. In order to increase the dimensional accuracy and hold it firmly, it is desirable that θ = 90 ° and the tip 7a forms a corner.
[0021]
【The invention's effect】
As described above in detail, according to the grooving throw-away tool of the present invention, the tip attaching portion extending in the longitudinal direction is disposed at the tip of the holder, and the tip is placed on the tip attaching portion. In the structure in which the tip is fixed by a clamp plate integrally provided with the holder so as to cover the upper surface of the tip, the tip mounting portion is adjacent to the rear end portion of the rear seating surface and protrudes to the front end side. And a cutting edge fitted to the step on the rear seating surface and a cutting edge at the tip of the notch at each position rotationally symmetric with respect to a virtual center line extending in the width direction of the chip. Provided and fixed so that the notched tip of the tip protrudes ahead of the tip of the holder, and is perpendicular to each of the lower seating surface, the rear seating surface, and the clamp plate Virtual flat The cross-sectional shape of the tip mounting part in the shape of a trapezoid with the rear seating surface as the bottom is to improve the positional accuracy of the tip and front ends of the tip cutting blade and enable precision machining and suppress chatter vibration. In addition, it is a throw-away tool for grooving that can be finely processed and has a chip holder that can hold various chips regardless of the tip shape of the chip, and in particular can easily perform grooving with a small diameter.
[Brief description of the drawings]
FIG. 1A is a transverse sectional view, FIG. 1B is a longitudinal sectional view, and FIG. 1C is a side view showing an embodiment of a grooving throw-away tool according to the present invention.
FIG. 2 is a cross-sectional view showing another embodiment of the grooving throw-away tool of the present invention.
FIGS. 3A and 3B are diagrams showing a conventional grooving throw-away tool, in which FIG. 3A is a side view, and FIG. 3B is a side view when the cutting blade of the grooving throw-away tool in FIG. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Throw-away tool 2 for grooving Holder 3 Tip attachment part 3A Lower seating surface 3B Rear seating surface 4 Tip 4A Center axis 5 Clamp plate 7 Step 7a Step end 8 (8a, 8b) Notch 9 (9a, 9b ) Cut-out tip 10 (10a, 10b) Cutting edge 13a Front side 13b of chip Total length of tip of rear side of chip (length of front side) L
Projection length at the tip of the chip L ₁
Tip rear side length L ₂

Claims

In the throw-away tool for grooving, in which a tip mounting portion extending in the longitudinal direction of the holder is disposed at the tip of the holder, the tip is attached to the tip mounting portion and the tip is pressed from the upper surface and fixed.
The tip mounting portion includes a lower seating surface that extends along the longitudinal direction of the holder, and a rear seating that is erected with respect to the lower seating surface and that is a flat surface that extends along the longitudinal direction of the holder. And a step that is adjacent to the end of the rear seating surface in the longitudinal direction of the holder and protrudes toward the front end.
The tip has a notch that fits into the step of the rear seating surface at a position that is rotationally symmetric with respect to a virtual center line extending in the width direction of the tip, and a cutting edge at the tip of the notched tip . and, equipped with a,
The chip is mounted on the chip mounting portion such that the notched tip of the chip protrudes ahead of the tip of the holder, and a lower seating surface and a rear seating surface of the chip mounting portion, and the chip The chip is fixed by a clamp plate provided integrally with the holder so as to cover the upper surface of the chip, and the chip is in a virtual plane perpendicular to each of the lower seating surface, the rear seating surface and the clamp plate. A throwaway tool for grooving, characterized in that the cross-sectional shape of the mounting portion is a trapezoidal shape with the rear seating surface as the bottom.