JP3567381B2 - Cutting tool and method of manufacturing cutting tool - Google Patents

Cutting tool and method of manufacturing cutting tool Download PDF

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Publication number
JP3567381B2
JP3567381B2 JP10420993A JP10420993A JP3567381B2 JP 3567381 B2 JP3567381 B2 JP 3567381B2 JP 10420993 A JP10420993 A JP 10420993A JP 10420993 A JP10420993 A JP 10420993A JP 3567381 B2 JP3567381 B2 JP 3567381B2
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Japan
Prior art keywords
cutting
sintering
high hardness
twisted
cutting tool
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JP10420993A
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Japanese (ja)
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JPH06312311A (en
Inventor
隆侑 西村
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GN Tool Co Ltd
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GN Tool Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/1081—Shank-type cutters, i.e. with an integral shaft with permanently fixed cutting inserts 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D77/00—Reaming tools
    • B23D77/02—Reamers with inserted cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/64—End milling cutters having a groove in the end cutting face, the groove not being present so as to provide a cutting edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/28—Details of hard metal, i.e. cemented carbide

Description

【０００１】
【産業上の利用分野】
本発明はドリル，リ−マ，ル−タビット，エンドミル等の切削工具に関するものである。
【０００２】
【従来の技術】
近年、切削性能の向上、工具寿命の延長という観点から、刃部となる母材本体を超硬合金で構成させると共に、高温高圧下（約５．５キロパスカル約１２００℃以上）で焼結されるダイヤモンド多焼結体（この明細書ではＰＣＤという）や立方晶窒化硼素焼結体（この明細書ではＣＢＮという）で切刃部分を構成させたものや、また、真空ホットプレス→押出し加工→真空炉焼結の順序で焼結したセラミックやサ−メットにより工具全体を構成させたものが市場に出回っている。
【０００３】
しかしながら、前者のものはその製造の際、特開平３−２７７４１２に開示した高価な高温高圧装置が必要となることからコスト高となってしまうという問題があり、後者のものは切削工具全体（母材本体、切刃部分及びシャンク）が同質のセラミックやサ−メットで製造されているので、母材本体が超鋼合金で形成されている前者のものと比較すると、硬度及び耐磨耗性は同程度に優れているが切削工具としての強度・剛性に欠けているという問題があった。
【０００４】
したがって、切削性能が非常に優れ且つ工具寿命が長く、更に安価な切削工具の開発が望まれている。
【０００５】
【発明が解決しようとする課題】
そこで、この発明は、切削性能が非常に優れ且つ工具寿命が長く、更に安価な切削工具を提供することを課題とする。
【０００６】
【課題を解決するための手段】
この発明の切削工具は、母材本体２０が超硬合金より構成されていると共にその円柱形の外周面における切刃形成箇所に長さ方向全長に渡って形成されたねじれ凹溝１４ａに、母材本体よりも硬度が高く且つ耐摩耗性に優れた高硬度・高耐磨耗性焼結体１６が一体的に焼結されており、前記高硬度・高耐摩耗性焼結体１６に沿って、捩じれた切刃１５が形成されている切削工具において、母材本体２０のねじれ凹溝１４ａに充填埋設された、超硬合金を除く高硬度・高耐摩耗性焼結体１６となる焼結粉体を、プラズマ活性化焼結法により一体的に焼結固着している。
【０００７】
前記切削工具を、捩じれたランド１４と、各ランド１４の一端縁に設けられた捩じれた切刃１５と、前記切刃１５と連続して設けられた先端刃１７とを有するものとしてあり、切刃１５及び先端刃１７の外側部分についてはセラミック材を焼結した前記高硬度・高耐摩耗性焼結体１６により構成してあるものとすることができる。
また、前記切削工具を、捩じれたランド１４と、各ランド１４の一端縁に設けられた捩じれた切刃１５と、前記切刃１５と連続して設けられた先端刃１７とを有するものとしてあり、切刃１５及び先端刃１７の外側部分についてはＣＢＮ粉末を焼結した前記高硬度・高耐摩耗性焼結体１６により構成してあるものとすることができる。
更に、前記ねじれ凹溝１４ａが、その幅を１〜２ｍｍとすると共に深さを３ｍｍとしてあるものとすることができる。
或いは、スパイラルエンドミルの切削工具の製造方法として、超硬合金により構成された円柱形部材２０´の長さ方向全長に渡ってねじれ凹溝１４ａを形成し、母材本体２０を製作する工程（第１工程）と、この母材本体２０のねじれ凹溝１４ａ内に、超硬合金を除く高硬度・高耐摩耗性焼結体１６となる原料粉末を金属の焼結助材を混合して充填し、これと母材本体２０とをプラズマ活性化焼結法により一体的に焼結固着する工程（第２、第３工程）と、前記焼結固着した部材とシャンク材１２とを接合し、高硬度・高耐磨耗焼結体１６に沿って切刃１５を放電加工により加工する工程（第４、第５工程）と、によるものとすることができる。

【０００８】
【作用】
この発明は次の作用を奏する。
この発明の切削工具は、母材本体２０が超硬合金により構成されていると共に切刃１５部分が前記母材本体２０より硬度が高く且つ耐磨耗性に優れた高硬度・高耐耗性焼結体で構成されており、前記切刃１５部分と母材本体２０とが一体的に焼結固着されているから、▲１▼切刃１５が高硬度で且つ耐磨耗性に優れ、▲２▼切削時における切削工具としての強度・剛性に優れたものとなる。
【０００９】
又、前記切刃１５部分と母材本体２０との一体的な焼結固着をプラズマ活性化焼結法により行うものであるから、低コストで製造できる。
【００１０】
【実施例】
以下、この発明の構成を実施例として示した図面にしたがって説明する。
図１及び図２はこの発明を４条のスパイラルエンドミル１０に適用した場合の実施例を示している。
このスパイラルエンドミル１０は、同図に示すように、刃部１１とこの刃部１１の一端にロー付接合（符号１８）されたシャンク部１２から構成されており、前記刃部１１は４つの捩じれたランド部１４と、各ランド１４の一端縁に設けられた捩じれた切刃１５と、前記切刃１５と連続して設けられた先端刃１７とを有するものとしてある。尚、上記刃部１１とシャンク部１２とはロー付接合に限られず、他の接合方法を採用することができる。
【００１１】
前記刃部１１はその母材を超鋼合金によって構成してあり、また、切刃１５及び先端刃１７の外側部分については高硬度・高耐磨耗性焼結体１６（ＣＢＮ，ＰＣＤ，セラミック，サーメットの粉末を図５に示したプラズマ活性化焼結法で焼結させて成る）により構成してあり、前記母材と高硬度・高耐磨耗性焼結体１６とは一体的に焼結固着してある。
【００１２】
ここで、図３〜図７を使用して上記スパイラルエンドミル１０の製造方法について説明する。
〔第１工程〕
超鋼合金により図３に示すような母材本体となる円柱形部材２０’を形成し、更に、前記円柱形部材２０’の外周面における切刃１５と成る部分にねじれ凹溝１４ａを形成し、図４に示すような母材本体２０を製作する。
【００１３】
尚、上記したねじれ凹溝１４ａは、母材本体２０の長さ方向全長に渡って設け（工具の種類によっては一部でもよい）てあり、その幅を約１〜２ｍｍとすると共に深さを約３ｍｍ程度としてある。
〔第２工程〕
上記した高硬度、高耐磨耗焼結体１６となるＣＢＮ，ＰＣＤ，セラミック，サ−メットの原料粉末に金属、炭化物、窒化物、酸化物の焼結助材等を混合し、図５に示すように前記母材本体２０のねじれ凹溝１４ａ内に充填する。
〔第３工程〕
前記凹溝１４ａに充填された高硬度・高耐磨耗焼結体１６と母材本体２０とを図７に示したプラズマ活性化焼結法により一体的に焼結固着する。
〔第４工程〕
第３工程で製造された刃部１１となる部材と、シャンク材１２とをロ−付接合し、図６に示すような半完成品２４を製作する。
〔第５工程〕
前記半完成品２４の高硬度・高耐磨耗性焼結体１６に沿って図２に示す如くねじれ溝１３を形成することによりランド部１４を構成させ、前記高硬度・高耐磨耗性焼結体１６部分に切刃１５を加工する。
【００１４】
尚、切刃１５の加工は、前記ダイヤモンド砥石を使用した研削加工でもよいし、場合によっては放電加工でもよい。
このように上記した第１〜第５工程によれば、図１及び図２に示したスパイラルエンドミルを製造することができる。
尚、この発明は、上記実施例のスパイラルエンドミルに適用することができるほか、図８、図９に示した如くドリルにも適用することができ、更には、図１０、図１１に示したリーマやその他の工具にも適用できる。
【００１５】
また、この発明は、図１２及び図１３に示した如くスロア−ウェイチップにも適用することができる。
【００１６】
【発明の効果】
作用に記載した内容から、切削性能が非常に優れ且つ工具寿命が長く、更に安価な切削工具を提供できた。
【図面の簡単な説明】
【図１】この発明の実施例のスパイラルエンドミルの正面図。
【図２】前記スパイラルエンドミルを先端側から見た図。
【図３】前記スパイラルエンドミルにおける刃部となる超鋼合金製の円柱形部材を示す斜視図。
【図４】前記スパイラルエンドミルの構成部である母材本体の斜視図。
【図５】前記母材本体のねじれ凹溝に高硬度・高耐磨耗焼結体となる原料粉末と焼結助材との混合物を充填した状態を示す斜視図。
【図６】前記スパイラルエンドミルの半完成品を示す斜視図。
【図７】前記スパイラルエンドミルを製造するときに使用するプラズマ活性焼結法の概略説明図。
【図８】この発明の二番目の実施例であるドリルの正面図。
【図９】前記ドリルの先端側側面図。
【図１０】この発明の三番目の実施例であるリーマの正面図。
【図１１】図１０のＡ−Ａの断面図の一部を示す図。
【図１２】この発明を適用したスロアーウエイチップの正面図。
【図１３】前記スロアーウエイチップの側面図。
【符号の説明】
１０ スパイラルエンドミル
１１ 刃部
１２ シャンク部
１３ ねじれ溝
１４ ランド
１５ ねじれ切刃
１６ 高硬度・高耐磨耗性焼結体
１７ 先端刃
１８ ロ−付接合部
２０ 母材本体
２４ 半完成品[0001]
[Industrial applications]
The present invention relates to a cutting tool such as a drill, a reamer, a router bit, and an end mill.
[0002]
[Prior art]
In recent years, from the viewpoint of improving cutting performance and extending tool life, the base metal body serving as the blade is made of a cemented carbide and sintered at a high temperature and a high pressure (about 5.5 kilopascals about 1200 ° C. or more). The cutting edge portion is composed of a diamond multi-sintered body (referred to as PCD in this specification) or a cubic boron nitride sintered body (referred to as CBN in this specification), or a vacuum hot press → extrusion → Ceramics and cermets that have been sintered in the order of vacuum furnace sintering to constitute the entire tool are commercially available.
[0003]
However, the former has a problem that the production thereof requires an expensive high-temperature and high-pressure apparatus disclosed in Japanese Patent Application Laid-Open No. 3-277412, resulting in an increase in cost. The main body, cutting edge and shank) are made of the same ceramic or cermet, so that the hardness and abrasion resistance are lower than those of the former, whose base metal body is formed of a super-steel alloy. There is a problem that the strength and rigidity of the cutting tool are lacking, although the strength is as good.
[0004]
Therefore, there is a demand for the development of an inexpensive cutting tool that has excellent cutting performance and a long tool life.
[0005]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a more inexpensive cutting tool having very excellent cutting performance, a long tool life, and a low cost.
[0006]
[Means for Solving the Problems]
According to the cutting tool of the present invention, the base metal body 20 is formed of a cemented carbide , and the mother groove is formed in the torsion groove 14a formed over the entire length in the cutting edge forming portion on the cylindrical outer peripheral surface. A high-hardness and high-abrasion-resistant sintered body 16 having a higher hardness than the material main body and excellent in abrasion resistance is integrally sintered, and along the high-hardness / high-abrasion-resistant sintered body 16 . In the cutting tool having the twisted cutting edge 15 formed therein, the sintered body 16 becomes a high hardness and high wear resistant sintered body 16 excluding a cemented carbide, which is filled and buried in the twisted groove 14 a of the base metal body 20. The consolidated powder is integrally sintered and fixed by a plasma activated sintering method.
[0007]
The cutting tool includes a twisted land 14, a twisted cutting blade 15 provided at one edge of each land 14, and a tip blade 17 provided continuously with the cutting blade 15. The outer portions of the blade 15 and the tip blade 17 can be formed of the high hardness and high wear resistant sintered body 16 obtained by sintering a ceramic material.
Further, the cutting tool includes twisted lands 14, a twisted cutting blade 15 provided at one edge of each land 14, and a tip blade 17 provided continuously with the cutting blade 15. The outer portions of the cutting blade 15 and the tip blade 17 can be constituted by the high hardness and high wear resistant sintered body 16 obtained by sintering CBN powder.
Further, the twist groove 14a may have a width of 1 to 2 mm and a depth of 3 mm.
Alternatively, as a method of manufacturing a cutting tool of a spiral end mill, a step of forming a twisted groove 14a over the entire length in the length direction of a cylindrical member 20 ′ made of a cemented carbide and manufacturing the base material body 20 (No. 1) and filling the twisted groove 14a of the base material body 20 with a raw material powder to be a high hardness and high wear resistant sintered body 16 excluding a cemented carbide by mixing a metal sintering aid. Then, a step (second and third steps) of integrally sintering and fixing the base material body 20 and the base material body 20 by a plasma activated sintering method, and joining the sinter-fixed member and the shank material 12 together, A step (fourth and fifth steps) of machining the cutting edge 15 by electric discharge machining along the high hardness and high wear resistant sintered body 16.

[0008]
[Action]
The present invention has the following operations.
According to the cutting tool of the present invention, the base material main body 20 is made of a cemented carbide, and the cutting edge 15 is higher in hardness and wear resistance than the base material main body 20 and has high hardness and high wear resistance. Since the cutting blade 15 is formed of a sintered body and the cutting blade 15 and the base material body 20 are integrally fixed by sintering, (1) the cutting blade 15 has high hardness and excellent wear resistance, (2) It has excellent strength and rigidity as a cutting tool during cutting.
[0009]
In addition, since the sintering and fixing of the cutting blade 15 and the base material main body 20 are integrally performed by the plasma activated sintering method, it can be manufactured at low cost.
[0010]
【Example】
Hereinafter, a configuration of the present invention will be described with reference to the drawings showing examples.
1 and 2 show an embodiment in which the present invention is applied to a four-row spiral end mill 10. FIG.
As shown in FIG. 1, the spiral end mill 10 includes a blade 11 and a shank 12 brazed to one end of the blade 11 (reference numeral 18). The blade 11 has four twists. Lands 14, a twisted cutting blade 15 provided at one end edge of each land 14, and a tip blade 17 provided continuously with the cutting blade 15. In addition, the blade part 11 and the shank part 12 are not limited to brazing, and other bonding methods can be adopted.
[0011]
The blade 11 has a base material made of a super-steel alloy, and the outer portions of the cutting blade 15 and the tip blade 17 have a high hardness and high wear resistant sintered body 16 (CBN, PCD, ceramic). , The cermet powder is sintered by the plasma activated sintering method shown in FIG. 5), and the base material and the high hardness and high wear resistant sintered body 16 are integrally formed. Sintered and fixed.
[0012]
Here, a method of manufacturing the spiral end mill 10 will be described with reference to FIGS.
[First step]
As shown in FIG. 3, a cylindrical member 20 'serving as a base metal body is formed of a super-steel alloy, and further, a twist groove 14a is formed in a portion serving as a cutting edge 15 on the outer peripheral surface of the cylindrical member 20'. Then, a base material main body 20 as shown in FIG. 4 is manufactured.
[0013]
The above-mentioned torsion groove 14a is provided over the entire length in the longitudinal direction of the base material main body 20 (it may be a part depending on the type of tool), and its width is about 1 to 2 mm and its depth is about 1 to 2 mm. It is about 3 mm.
[Second step]
The raw material powder of CBN, PCD, ceramic and cermet, which becomes the above-mentioned high hardness and high wear resistant sintered body 16, is mixed with a sintering aid of metal, carbide, nitride, oxide and the like. As shown, the material is filled in the torsion groove 14a of the base material body 20.
[Third step]
The sintered body 16 having high hardness and high wear resistance and the base material body 20 filled in the concave groove 14a are integrally sintered and fixed by the plasma activated sintering method shown in FIG.
[Fourth step]
The member to be the blade portion 11 manufactured in the third step and the shank material 12 are brazed and joined to produce a semi-finished product 24 as shown in FIG.
[Fifth step]
The twisted groove 13 is formed along the high hardness and high wear resistant sintered body 16 of the semi-finished product 24 as shown in FIG. The cutting blade 15 is formed on the sintered body 16.
[0014]
The processing of the cutting blade 15 may be grinding using the diamond grindstone, or may be electrical discharge machining in some cases.
Thus, according to the above-described first to fifth steps, the spiral end mill shown in FIGS. 1 and 2 can be manufactured.
The present invention can be applied not only to the spiral end mill of the above embodiment, but also to a drill as shown in FIGS. 8 and 9, and further to a reaming machine shown in FIGS. And other tools.
[0015]
The present invention can also be applied to a throw-away chip as shown in FIGS.
[0016]
【The invention's effect】
From the contents described in the action, it was possible to provide a more inexpensive cutting tool having extremely excellent cutting performance and a long tool life.
[Brief description of the drawings]
FIG. 1 is a front view of a spiral end mill according to an embodiment of the present invention.
FIG. 2 is a view of the spiral end mill as viewed from a distal end side.
FIG. 3 is a perspective view showing a columnar member made of a super-steel alloy, which serves as a blade in the spiral end mill.
FIG. 4 is a perspective view of a base material main body which is a component of the spiral end mill.
FIG. 5 is a perspective view showing a state in which a mixture of a raw material powder and a sintering aid to be a high-hardness and high-abrasion-resistant sintered body is filled in the twisted groove of the base material main body.
FIG. 6 is a perspective view showing a semi-finished product of the spiral end mill.
FIG. 7 is a schematic explanatory view of a plasma activated sintering method used when manufacturing the spiral end mill.
FIG. 8 is a front view of a drill according to a second embodiment of the present invention.
FIG. 9 is a front side view of the drill.
FIG. 10 is a front view of a reamer according to a third embodiment of the present invention.
FIG. 11 is a diagram showing a part of a cross-sectional view taken along line AA of FIG. 10;
FIG. 12 is a front view of a lower way chip to which the present invention is applied.
FIG. 13 is a side view of the lower way chip.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Spiral end mill 11 Blade part 12 Shank part 13 Twisted groove 14 Land 15 Twisted cutting blade 16 High hardness and high abrasion resistant sintered body 17 Tip blade 18 Joining part 20 Base material body 24 Semi-finished product

Claims (5)

母材本体（２０）が超硬合金より構成されていると共にその円柱形の外周面における切刃形成箇所に長さ方向全長に渡って形成されたねじれ凹溝（１４ａ）に、母材本体よりも硬度が高く且つ耐摩耗性に優れた高硬度・高耐磨耗性焼結体（１６）が一体的に焼結されており、前記高硬度・高耐摩耗性焼結体（１６）に沿って、捩じれた切刃（１５）が形成されている切削工具において、母材本体（２０）のねじれ凹溝（１４ａ）に充填埋設された、超硬合金を除く高硬度・高耐摩耗性焼結体（１６）となる焼結粉体を、プラズマ活性化焼結法により一体的に焼結固着していることを特徴とする切削工具。The base metal body (20) is made of a cemented carbide, and is formed into a torsion groove (14a) formed over the entire length in the cutting edge formation portion on the outer peripheral surface of the columnar shape. A high hardness and high wear resistant sintered body (16) having high hardness and excellent wear resistance is integrally sintered, and the high hardness and high wear resistant sintered body (16) is A cutting tool having a twisted cutting edge (15) along it, having high hardness and high wear resistance excluding cemented carbide , filled and embedded in the twisted groove (14a) of the base metal body (20) . A cutting tool, wherein a sintered powder to be a sintered body (16) is integrally sintered and fixed by a plasma activated sintering method. 捩じれたランド（１４）と、各ランド（１４）の一端縁に設けられた捩じれた切刃（１５）と、前記切刃（１５）と連続して設けられた先端刃（１７）とを有するものとしてあり、切刃（１５）及び先端刃（１７）の外側部分についてはセラミック材を焼結した前記高硬度・高耐摩耗性焼結体（１６）により構成してあることを特徴とする請求項１記載の切削工具。 It has twisted lands (14), twisted cutting blades (15) provided at one edge of each land (14), and tip blades (17) provided continuously with the cutting blades (15). The cutting blade (15) and the outer part of the tip blade (17) are made of a high hardness and high wear resistant sintered body (16) obtained by sintering a ceramic material. The cutting tool according to claim 1. 捩じれたランド（１４）と、各ランド（１４）の一端縁に設けられた捩じれた切刃（１５）と、前記切刃（１５）と連続して設けられた先端刃（１７）とを有するものとしてあり、切刃（１５）及び先端刃（１７）の外側部分についてはＣＢＮ粉末を焼結した前記高硬度・高耐摩耗性焼結体（１６）により構成してあることを特徴とする請求項１記載の切削工具。 It has twisted lands (14), twisted cutting blades (15) provided at one edge of each land (14), and tip blades (17) provided continuously with the cutting blades (15). The cutting blade (15) and the outer portion of the tip blade (17) are constituted by the high hardness and high wear resistant sintered body (16) obtained by sintering CBN powder. The cutting tool according to claim 1. ねじれ凹溝（１４ａ）が、その幅を１〜２ｍｍとすると共に深さを３ｍｍとしてある請求項１、２または３記載の切削工具。 4. The cutting tool according to claim 1, wherein the torsion groove has a width of 1 to 2 mm and a depth of 3 mm . 超硬合金により構成された円柱形部材（２０´）の長さ方向全長に渡ってねじれ凹溝（１４ａ）を形成し、母材本体（２０）を製作する工程と、前記母材本体（２０）のねじれ凹溝（１４ａ）内に、超硬合金を除く高硬度・高耐摩耗性焼結体（１６）となる原料粉末を金属の焼結助材を混合して充填し、これと母材本体（２０）とをプラズマ活性化焼結法により一体的に焼結固着する工程と、前記焼結固着した部材とシャンク材（１２）とを接合し、高硬度・高耐磨耗焼結体（１６）に沿って切刃（１５）を放電加工により加工する工程と、によるスパイラルエンドミルの切削工具の製造方法。 Forming a torsion groove (14a) over the entire length of the columnar member (20 ') made of cemented carbide to produce a base material body (20); ) Is mixed with a metal sintering aid and filled with a raw material powder to be a high hardness and high wear resistant sintered body (16) excluding a cemented carbide. A step of integrally sintering and fixing the material body (20) by a plasma activated sintering method, and a step of joining the sintering-fixed member and the shank material (12) to achieve high hardness and high wear resistance sintering. Machining the cutting blade (15) by electric discharge machining along the body (16) .
JP10420993A 1993-04-30 1993-04-30 Cutting tool and method of manufacturing cutting tool Expired - Lifetime JP3567381B2 (en)

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JPH06312311A JPH06312311A (en) 1994-11-08
JP3567381B2 true JP3567381B2 (en) 2004-09-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2556393B2 (en) * 1990-02-07 1996-11-20 ジーエヌツール株式会社 Cutting tool having twisted blade and manufacturing method thereof
JPH04210315A (en) * 1990-08-10 1992-07-31 Nachi Fujikoshi Corp Rotary cutting tool
JP2699031B2 (en) * 1991-05-21 1998-01-19 株式会社不二越 Multi-layer coating tool

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