JPH0366082B2 - - Google Patents
Info
- Publication number
- JPH0366082B2 JPH0366082B2 JP60177812A JP17781285A JPH0366082B2 JP H0366082 B2 JPH0366082 B2 JP H0366082B2 JP 60177812 A JP60177812 A JP 60177812A JP 17781285 A JP17781285 A JP 17781285A JP H0366082 B2 JPH0366082 B2 JP H0366082B2
- Authority
- JP
- Japan
- Prior art keywords
- throw
- away
- land
- flaking
- chip
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
- B23B27/145—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having a special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/08—Rake or top surfaces
- B23B2200/085—Rake or top surfaces discontinuous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/08—Rake or top surfaces
- B23B2200/086—Rake or top surfaces with one or more grooves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Description
［産業上の利用分野］
本発明は切削用のスローアウエイチツプにフレ
ーキング防止構造に関し、特に高硬度材料の切削
に使用するスローアウエイチツプのフレーキング
防止構造に関するものである。
［従来の技術］
近年、高硬度材料の加工用に超硬合金、あるい
はセラミツク製のスローアウエイチツプが開発さ
れ、従来行われていた切削中心の加工に替えて、
こうした超硬合金、あるいはセラミツク製のスロ
ーアウエイチツプを用いた高硬度材料の切削加工
が広く行われるようになつた。
［発明が解決しようとする問題点］
ところが、こうした従来のスローアウエイチツ
プには、切削中にチツプのすくい面に工具寿命を
決定する大きな要因となる剥離、いわゆるフレー
キングが生じるという問題があつた。このフレー
キングの発生には種々のメカニズムが関与する
が、例えば第６図に示すようにクレータ摩耗から
進行するものがある。第６図Ａはクレータ摩耗の
発生状況を示す刃先の断面図、第６図Ｂはクレー
タ摩耗からフレーキングが発生し欠けへと進行す
る状況を示す刃先の断面図である。
高硬度材料を切削すると、切粉は加工硬化によ
り非常に硬くなり、このためスローアウエイチツ
プと切粉との接触面にクレータ摩耗が生じる。第
６図Ａに示すように、クレータ摩耗が生じた初期
の段階では、その面はクレータ摩耗面１であり、
切粉の流れ方向は二点鎖線ａで示す方向である。
しかし、さらにクレータ摩耗が進行すると、その
面はクレータ摩耗面２となり、切粉の流れ方向は
二点鎖線ｂで示す方向となる。この際、深くえぐ
れたクレータ摩耗面２の終端面２ａは、切粉の流
れ方向にとつて壁として働き、大きな力を受け、
この終端面２ａが切粉の流れ抵抗に耐えられなく
なると、第６図Ｂに示すフレーキング３の引き起
こすことがあり、場合によつては刃先４の近傍に
まで達する様な大きなフレーキング５となること
がある。この様な状態となると刃先４の強度が弱
くなり欠け６を生じ、切れ味が急激に低下し、切
削を続けることができなくなる。従つて、従来の
スローアウエイチツプでは、フレーキングによつ
てその寿命が著しく短くなつてしまうことがあり
問題となつていた。
そこで本発明は、フレーキングの発生ひいては
欠けの発生を防止しチツプの高寿命を実現するこ
とを目的としてなされた。
［問題点を解決するための手段］
かかる目的を実現すべく、本発明は上記問題を
解決するための手段として、次の構成を取つた。
これを第１図で説明する。第１図は本発明に係る
スローアウエイチツプの一構成例を示す刃先の断
面図である。
即ち、本発明の要旨は、高硬度材料に対して使
用され、刃先４にチヤンフアー７とランド８とを
備えたスローアウエイチツプのフレーキング防止
構造において、上記チヤンフアーとランドとから
なる幅0.2mm前後の薄肉の切削部をスローアウエ
イチツプより突出して形成するとともに、前記ラ
ンドの後方に略垂直に切れ落ちる壁面を形成した
ことを特徴とするスローアウエイチツプのフレー
キング防止構造の構成にある。
［作用］
本発明のスローアウエイチツプのフレーキング
防止構造には、幅が0.2mm程度の薄肉の切削部が
スローアウエイチツプより突出して設けてあり、
ランドの後方には略垂直に形成された壁面が設け
てある。
従つて、第６図Ａに示す様に、クレータ摩耗が
進行した場合には、終端面２ａはできないか又は
できたとしても終端面２ａの厚さは薄く、切粉の
流れ抵抗にそり容易に壊れ、切粉の流れ抵抗を小
さく維持するように働き、フレーキングの発生を
防止する。
［実施例］
以下に本発明の実施例を図面に基づいて説明す
る。
第２図は第一実施例としてのスローアウエイチ
ツプの形状を示す平面図、第３図は第２図のＡ−
Ａ断面図である。
図示する如く、セラミツク製のスローアウエイ
チツプ１０には、その縁部に凹部１１がドーナツ
ツ状に設けられている。この凹部１１の外周側の
壁部は、ランドと直角に形成されている。つま
り、壁部はランドから垂直に切れ落ちている。
本発明においては、チヤンフアーとランドとか
ら構成されて突出する薄肉の切削部の幅１を、
0.2mmとした。本実施例のようにセラミツク製ス
ローアウエイチツプを用いて高硬度材料を切削す
る場合には、この幅１の寸法は0.1mm以上とした
方が切粉の流れが良く、良好な切削ができる。
以上のように構成された本実施例においては、
チツプ寿命が改善され高寿命が得られた。例え
ば、被削材SKD11、硬度HRC62を用い、切削速
度150ｍ／分、送お0.13mm／rev、切込み0.5mmに
おけるチツプ寿命は次表の如くである。使用した
スローアウエイチツプの形状はJISSNGN432で
ある。
[Industrial Field of Application] The present invention relates to a flaking prevention structure for a throwaway tip for cutting, and more particularly to a flaking prevention structure for a throwaway tip used for cutting high hardness materials. [Prior art] In recent years, throw-away tips made of cemented carbide or ceramics have been developed for processing high-hardness materials, replacing the conventional cutting-centered processing.
Cutting of high-hardness materials using such cemented carbide or ceramic throw-away tips has become widespread. [Problems to be solved by the invention] However, these conventional throw-away chips have a problem in that during cutting, so-called flaking occurs on the rake face of the chip, which is a major factor in determining tool life. . Various mechanisms are involved in the occurrence of this flaking, and for example, as shown in FIG. 6, there is one that progresses from crater wear. FIG. 6A is a cross-sectional view of the cutting edge showing how crater wear occurs, and FIG. 6B is a cross-sectional view of the cutting edge showing how flaking occurs from crater wear and progresses to chipping. When cutting high-hardness materials, the chips become extremely hard due to work hardening, which causes crater wear on the contact surface between the throw-away tip and the chips. As shown in FIG. 6A, at the initial stage of crater wear, the surface is crater wear surface 1;
The flow direction of the chips is the direction shown by the two-dot chain line a.
However, as the crater wear progresses further, that surface becomes the crater wear surface 2, and the flow direction of the chips becomes the direction shown by the two-dot chain line b. At this time, the deeply gouged end surface 2a of the crater wear surface 2 acts as a wall in the flow direction of the chips and receives a large force.
If the end face 2a cannot withstand the flow resistance of the chips, flaking 3 shown in FIG. It may happen. In such a state, the strength of the cutting edge 4 becomes weaker, causing chipping 6, and sharpness decreases rapidly, making it impossible to continue cutting. Therefore, with conventional throw-away chips, flaking can significantly shorten their lifespan, which has been a problem. Therefore, the present invention has been made with the object of preventing the occurrence of flaking and eventually chipping, and realizing a long life of chips. [Means for Solving the Problems] In order to achieve the above object, the present invention adopts the following configuration as a means for solving the above problems.
This will be explained with reference to FIG. FIG. 1 is a sectional view of a cutting edge showing an example of the structure of a throw-away tip according to the present invention. That is, the gist of the present invention is to provide a flaking prevention structure for a throw-away tip that is used for high-hardness materials and has a chamfer 7 and a land 8 on the cutting edge 4. The structure of the anti-flaking structure for a throw-away chip is characterized in that a thin-walled cut portion is formed to protrude from the throw-away chip, and a wall surface that cuts off substantially perpendicularly to the rear of the land is formed. [Function] The anti-flaking structure of the throw-away chip of the present invention includes a thin cut portion with a width of about 0.2 mm that protrudes from the throw-away chip.
A substantially vertical wall is provided at the rear of the land. Therefore, as shown in FIG. 6A, when crater wear progresses, the end surface 2a may not be formed, or even if it is formed, the thickness of the end surface 2a is thin and it easily warps due to the flow resistance of chips. It works to keep the flow resistance of chips small and prevent flaking. [Example] Examples of the present invention will be described below based on the drawings. FIG. 2 is a plan view showing the shape of the throw-away tip as the first embodiment, and FIG. 3 is the A--FIG.
It is an A sectional view. As shown in the figure, a ceramic throwaway tip 10 has a donut-shaped recess 11 at its edge. The outer peripheral wall of this recess 11 is formed perpendicular to the land. In other words, the wall is cut vertically off the land. In the present invention, the width 1 of the thin-walled cutting part that is composed of a chamfer and a land and protrudes is defined as:
It was set to 0.2mm. When cutting a high-hardness material using a ceramic throw-away tip as in this embodiment, it is better to set the width 1 to 0.1 mm or more for better flow of chips and better cutting. In this embodiment configured as above,
The chip life has been improved and a long life has been achieved. For example, using a work material of SKD11 and a hardness of HRC62, the chip life at a cutting speed of 150 m/min, a feed of 0.13 mm/rev, and a depth of cut of 0.5 mm is as shown in the following table. The shape of the throwaway tip used is JISSNGN432.
【表】
次に他の実施例を示す。第４図は第二実施例と
してのスローアウエイチツプの形状を示す平面
図、第５図は第４図のＢ−Ｂ断面図である。
図示する如く、スローアウエイチツプ１２の片
面にチヤンフアーとランドとを残し、他の部分の
全てを凹部１３としている。この実施例において
も凹部１３の壁面は、ランドと直角になつてい
る。これにより、第一実施例の効果の他にチツプ
製作時の金型形状を単純化することができ、又セ
ラミツク材料の節減を図ることができる。
以上の実施例において、ランドと略垂直をなす
壁部を有する凹部１１，１３を設けることによ
り、前述のごとく、欠けの発生を防止することが
でき、チツプの高寿命化を達成することができ
る。
尚、チヤンフアーとランドとから構成されて突
出した薄肉の切削部の幅１及び凹部１１，１３の
深さ等の形状は、加工条件及び加工資材により最
適の寸法を選定すればよい。
また、凹部１１，１３は、スローアウエイチツ
プ１０，１２の片面のみならず両面に設けてもよ
く、チツプの形状も四角形に限られることなく、
三角形、ひし形状、多角形状としてもよい。チツ
プ材質はセラミツクに限らず超硬合金等でもよ
い。
以上本発明のいくつかの実施例について説明し
たが、本発明はこのような実施例に何等限定され
るものではなく、本発明の要旨を逸脱しない範囲
において、種々なる態様で実施し得ることは勿論
である。
［発明の効果］
以上詳述したように、本発明のスローアウエイ
チツプのフレーキング防止構造は、薄肉の切削部
をスローアウエイチツプより突出して設けるとと
もに、ランドの後方に略垂直の壁面を設けること
によつて、従来のスローアウエイチツプに比べ
て、好適にフレーキングの発生を防止できるの
で、チツプの高寿命を実現する優れた効果を有す
る。
従つて、１切刃当りの切削量が増加し、スロー
アウエイチツプの節約、チツプ交換回数の減少等
を実現し、加工費を節減できるという効果が得ら
れる。[Table] Next, other examples will be shown. FIG. 4 is a plan view showing the shape of a throw-away tip as a second embodiment, and FIG. 5 is a sectional view taken along line BB in FIG. 4. As shown in the figure, a chamfer and a land are left on one side of the throwaway tip 12, and all other parts are made into recesses 13. Also in this embodiment, the wall surface of the recess 13 is perpendicular to the land. As a result, in addition to the effects of the first embodiment, it is possible to simplify the shape of the mold when manufacturing the chip, and it is also possible to reduce the amount of ceramic material used. In the above embodiment, by providing the recesses 11 and 13 having walls substantially perpendicular to the lands, chipping can be prevented as described above, and a longer life of the chip can be achieved. . Note that the width 1 of the protruding thin-walled cut portion composed of the chamfer and land, the depth of the recesses 11 and 13, and other shapes may be selected to be optimal dimensions depending on the processing conditions and processing materials. Further, the recesses 11 and 13 may be provided not only on one side but also on both sides of the throwaway tips 10 and 12, and the shape of the tips is not limited to a square.
It may also be triangular, diamond-shaped, or polygonal. The material of the chip is not limited to ceramic, but may also be made of cemented carbide or the like. Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and can be implemented in various forms without departing from the gist of the present invention. Of course. [Effects of the Invention] As detailed above, the anti-flaking structure of the throw-away chip of the present invention includes providing a thin cut portion protruding from the throw-away chip and providing a substantially vertical wall surface behind the land. Therefore, the occurrence of flaking can be more effectively prevented than in conventional throw-away chips, and this has an excellent effect of realizing a long life of the chip. Therefore, the amount of cutting per cutting edge increases, the number of throw-away tips can be saved, the number of times tips are replaced can be reduced, and processing costs can be reduced.
第１図は、本発明に係るスローアウエイチツプ
の一構成例を示す刃先の断面図、第２図は本発明
に係るスローアウエイチツプの平面図、第３図は
第２図のＡ−Ａ断面図、第４図は本発明に係る他
の実施例を示すスローアウエイチツプの平面図、
第５図は第４図のＢ−Ｂ断面図、第６図Ａはクレ
ータ摩耗の発生状況を示す刃先の断面図、第６図
Ｂはクレータ摩耗からフレーキングが発生し欠け
へと進行する状況を示す刃先の断面図である。
９，１１，１３……凹部、１０，１２……スロ
ーアウエイチツプ。
FIG. 1 is a cross-sectional view of a cutting edge showing an example of the configuration of a throw-away tip according to the present invention, FIG. 2 is a plan view of the throw-away tip according to the present invention, and FIG. FIG. 4 is a plan view of a throwaway tip showing another embodiment according to the present invention.
Figure 5 is a sectional view taken along line B-B in Figure 4, Figure 6A is a cross-sectional view of the cutting edge showing how crater wear occurs, and Figure 6B shows how crater wear causes flaking and progresses to chipping. It is a sectional view of the cutting edge showing. 9, 11, 13... recess, 10, 12... throwaway tip.
Claims (1)
フアーとランドとを備えたスローアウエイチツプ
のフレーキング防止構造において、 上記チヤンフアーとランドとからなる幅0.2mm
前後の薄肉の切削部をスローアウエイチツプより
突出して形成するとともに、前記ランドの後方に
略垂直に切れ落ちる壁面を形成したことを特徴と
するスローアウエイチツプのフレーキング防止構
造。[Scope of Claims] 1. A flaking prevention structure for a throw-away tip that is used for high-hardness materials and has a chamfer and a land on the cutting edge, wherein the width of the chimney and the land is 0.2 mm.
A flaking prevention structure for a throw-away chip, characterized in that front and rear thin-walled cut portions are formed to protrude from the throw-away chip, and a wall surface that cuts off substantially perpendicularly to the rear of the land is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17781285A JPS6239101A (en) | 1985-08-12 | 1985-08-12 | Throw away chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17781285A JPS6239101A (en) | 1985-08-12 | 1985-08-12 | Throw away chip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6239101A JPS6239101A (en) | 1987-02-20 |
| JPH0366082B2 true JPH0366082B2 (en) | 1991-10-16 |
Family
ID=16037517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17781285A Granted JPS6239101A (en) | 1985-08-12 | 1985-08-12 | Throw away chip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6239101A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8696264B2 (en) * | 2012-01-31 | 2014-04-15 | Kennametal Inc. | Modular cutting insert and method of making same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5148111B2 (en) * | 1972-06-16 | 1976-12-18 | ||
| JPS51119677U (en) * | 1975-03-25 | 1976-09-28 | ||
| GB2035859B (en) * | 1978-11-17 | 1982-08-25 | Kennametal Inc | Cutting insert |
-
1985
- 1985-08-12 JP JP17781285A patent/JPS6239101A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6239101A (en) | 1987-02-20 |
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