JPH031134Y2 - - Google Patents
Info
- Publication number
- JPH031134Y2 JPH031134Y2 JP1984108154U JP10815484U JPH031134Y2 JP H031134 Y2 JPH031134 Y2 JP H031134Y2 JP 1984108154 U JP1984108154 U JP 1984108154U JP 10815484 U JP10815484 U JP 10815484U JP H031134 Y2 JPH031134 Y2 JP H031134Y2
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- drilling tool
- utility
- hard sintered
- model registration
- 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
Links
- 238000005520 cutting process Methods 0.000 claims description 45
- 238000005553 drilling Methods 0.000 claims description 27
- 229910003460 diamond Inorganic materials 0.000 claims description 6
- 239000010432 diamond Substances 0.000 claims description 6
- 229910052582 BN Inorganic materials 0.000 claims description 5
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 5
- 239000010953 base metal Substances 0.000 claims description 4
- 238000003754 machining Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 244000145845 chattering Species 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は、切刃にダイヤモンドやCBN（立方晶
型窒化硼素）などの硬質焼結体を使用した穴あけ
工具に関する。[Detailed description of the invention] (a) Industrial application field The present invention relates to a drilling tool that uses a hard sintered body such as diamond or CBN (cubic boron nitride) for the cutting edge.
(ロ) 従来技術とその問題点
近年、超高圧下焼結技術の発達に伴い、ダイヤ
モンドがCBNなどの多結晶焼結体が開発され、
各種切削工具の切刃として広く使用されるように
なつてきた。例えば、一般的な旋削、フライス工
具だけでなく、最近はリーマ、ガンドリルなど穴
あけ工具にもこの多結晶焼結体の切刃が使用され
つゝある。(b) Conventional technology and its problems In recent years, with the development of ultra-high pressure sintering technology, polycrystalline sintered bodies such as diamond and CBN have been developed.
It has come to be widely used as the cutting edge of various cutting tools. For example, cutting edges of this polycrystalline sintered body have recently been used not only for general turning and milling tools, but also for drilling tools such as reamers and gun drills.
本考案は、被削材に対して相対的に回転し穿孔
する穴あけ工具のうち、比較的小さな径の穴加工
を行なう工具に、硬質焼結体の切刃を採用すべく
工夫されたものである。 This invention was devised to use a hard sintered cutting blade in a drilling tool that rotates relative to the workpiece and drills a hole with a relatively small diameter. be.
即ち、直径が20mm程度以下の穴加工には、通
常、高速度鋼や超硬合金製の第７図に示す如きツ
イストドリル１が用いられているが、一般的硬質
焼結体は、第２図に例示した様に、硬質層２の厚
みが１mm程度の円板状であるので、これでツイス
トドリルの刃先先端部を形成しようとすれば技術
的な困難が伴う。特に硬質焼結体が難研削性であ
るだけに、先端チゼル部の加工が難かしい。 That is, for drilling holes with a diameter of about 20 mm or less, a twist drill 1 made of high-speed steel or cemented carbide as shown in Fig. 7 is usually used, but a general hard sintered body is As illustrated in the figure, since the hard layer 2 has a disk shape with a thickness of about 1 mm, it would be technically difficult to form the tip of the cutting edge of a twist drill with it. In particular, since the hard sintered body is difficult to grind, machining the tip chisel part is difficult.
一方、中心部を切り残しながら切削を進め、最
後に中心の切り残し部を除去して貫通穴を得る工
具として、第３図に示すホールソー３が知られて
いるが、その使用は比較的大径の穴加工に限られ
ている。 On the other hand, a hole saw 3 shown in Fig. 3 is known as a tool that proceeds with cutting while leaving the center portion uncut and finally removes the center uncut portion to obtain a through hole, but its use is relatively large. Limited to diameter hole machining.
ここで、第４図に示すように、円筒状シヤンク
４の先端に硬質焼結体５の小片を接合し、穴あけ
工具をホールソーと類似の構成とすれば、切刃の
加工は容易になる。しかし、この場合、特に加工
穴径が小さくなつてくると接合面積が非常に小さ
くなるため、硬質焼結体をシヤンクに強固に固着
することができず、切削中の切刃の脱落が多くな
る。即ち、実用に耐える工具が得られない。かと
云つて、シヤンクの肉厚並びに硬質焼結体の半径
方向肉厚を厚くし、接合面積を大きくすると、切
削抵抗が増大したり、焼結体が高価になつたりし
て好ましくない。 Here, as shown in FIG. 4, if a small piece of a hard sintered body 5 is bonded to the tip of the cylindrical shank 4 and the drilling tool is configured similar to a hole saw, machining of the cutting edge will be facilitated. However, in this case, especially as the machined hole diameter becomes smaller, the bonding area becomes very small, making it impossible to firmly fix the hard sintered body to the shank, and the cutting edge often falls off during cutting. . That is, a tool that can withstand practical use cannot be obtained. On the other hand, increasing the thickness of the shank and the radial thickness of the hard sintered body to increase the bonding area is not preferable because cutting resistance increases and the sintered body becomes expensive.
(ハ) 問題点を解決するための手段
そこで、本考案は、硬質焼結体を環状に形成す
ることにより、切刃の加工の問題と、接合強度の
問題を解決したものである。(c) Means for solving the problems Therefore, the present invention solves the problem of machining the cutting edge and the problem of joint strength by forming a hard sintered body into an annular shape.
即ち、本考案に使用する硬質焼結体の基本形状
は第５図に示す通りであり、環状に形成された硬
質焼結体１０の後面には、焼成時に台金１１が接
合されている。この台金１１を第６図に示す円筒
状シヤンク４に臘付けする等して固着した後、研
削により焼結体１０の前面に半径方向の切刃１２
を形成するか、又は切刃１２を先に形成しておい
たものをシヤンク４に接合する。その後円筒部の
外周又は内周あるいは内外周ともに少なくとも１
条の真直もしくは捩れた溝を加工すると第１図に
示す本考案の穴あけ工具が完成する。 That is, the basic shape of the hard sintered body used in the present invention is as shown in FIG. 5, and a base metal 11 is joined to the rear surface of the annular hard sintered body 10 during firing. After fixing this base metal 11 to the cylindrical shank 4 shown in FIG.
, or the cutting edge 12 is formed in advance and joined to the shank 4. After that, the outer circumference or inner circumference of the cylindrical part or both the inner and outer circumference
By machining straight or twisted grooves in the strip, the drilling tool of the present invention shown in FIG. 1 is completed.
出来上がつた工具は、硬質焼結体とシヤンクと
の間に僅かではあるが心ずれの生じることがある
ので、硬質焼結体の外周研磨による修正作業が必
要になる場合がある。 In the finished tool, there may be a slight misalignment between the hard sintered body and the shank, so correction work by polishing the outer periphery of the hard sintered body may be necessary.
さて、本考案で開示した穴あけ工具は、切れ味
を良くするために切刃は正のすくい角を付すのが
望ましい。即ち第８図及び第９図に示す半径方向
のすくい角α、軸方向のすくい角β、を正のすく
い角としている。切れ味を良くするには大きな正
のすくい角とすれば良いが、こうすると切刃の強
度が低下するために切削中に切刃が大きく欠損す
る恐れがあり好ましくない。 Now, in the drilling tool disclosed in the present invention, it is desirable that the cutting edge has a positive rake angle in order to improve sharpness. That is, the rake angle α in the radial direction and the rake angle β in the axial direction shown in FIGS. 8 and 9 are positive rake angles. A large positive rake angle may be used to improve sharpness, but this is not preferable because the strength of the cutting edge decreases and there is a risk that the cutting edge will be severely damaged during cutting.
相反する両者を両立させるために、種々実験を
行つた結果まず半径方向のすくい角αについては
5゜≦α≦20゜の範囲が最適で切れ味の良いかつ耐
欠損性に優れた工具を提供できる。即ちαが5゜よ
り小さいと、切削時の切削抵抗が増大し、例えば
高硬度に焼入れされた鋼やセラミツク等の穴あけ
時にはその切削抵抗のためにビビリが発生した
り、又最悪の場合は工具の折損にもつながる。一
方αが20゜を越えると急激に刃先強度が低下し短
時間の内に切刃に欠けが発生し好ましくない。 In order to achieve both contradictory requirements, we conducted various experiments and found that the rake angle α in the radial direction was
The range of 5°≦α≦20° is optimal, and it is possible to provide a tool with good sharpness and excellent fracture resistance. In other words, if α is smaller than 5°, the cutting resistance during cutting increases, and for example, when drilling into highly hardened steel or ceramics, the cutting resistance may cause chattering, or in the worst case, the tool It may also lead to breakage. On the other hand, if α exceeds 20°, the strength of the cutting edge will drop rapidly and chipping will occur in the cutting edge within a short period of time, which is undesirable.
次に軸方向のすくい角βについては3゜≦β≦
10゜の範囲が最適である。即ちβが3゜より小さい
場合は、スラスト方向に働く抵抗が大きく良好な
穴あけが困難で、特に加工穴の精度が低下する。
又10゜を越えると送り速度が高くなつた時に切刃
が欠損する。 Next, regarding the rake angle β in the axial direction, 3゜≦β≦
A range of 10° is optimal. That is, if β is smaller than 3°, the resistance acting in the thrust direction is large, making it difficult to make a good hole, and in particular, the accuracy of the drilled hole decreases.
Also, if the angle exceeds 10°, the cutting edge will break when the feed rate increases.
さて切刃傾き角γについては15′≦γ≦5゜の範
囲が良い。その根拠は、γが15゜以下になると穴
あけ工具を機械に取り付けた時に生じる取り付け
誤差によつて切刃の外周よりも内側が被削物に先
に当たる切削になる事があり、この事態が発生す
ると切味の低下を招き好ましい穴加工の状態では
なく加工穴精度が著しく低下する。一方穴の抜け
ぎわに発生するカエリや欠けを極力小さくするた
めにはγを大きくすると効果があるが、γが5゜を
越えてもγが5゜に比べて効果が大きくなく、逆に
刃先強度の低下を招き好ましくない。 Now, the cutting edge inclination angle γ is preferably in the range of 15'≦γ≦5°. The reason for this is that when γ is less than 15°, the inside of the cutting edge hits the workpiece first than the outer periphery due to the installation error that occurs when the drilling tool is installed on the machine, and this situation occurs. This leads to a decrease in cutting quality, resulting in an undesirable hole machining condition and a significant drop in the accuracy of the machined hole. On the other hand, increasing γ is effective in minimizing burrs and chips that occur at the edge of a hole, but even if γ exceeds 5°, the effect is not as great as when γ is 5°, and on the contrary, it increases the strength of the cutting edge. This is undesirable because it causes a decrease in
次に正面刃の逃げ角も切刃の強度面と切れ味の
関係から3゜≦θ≦10゜の範囲が良く、この範囲よ
りθが小さいと切れ味の低下が生じ、又逆に大き
い刃先強度が低下する。 Next, from the relationship between the strength of the cutting edge and the sharpness, the clearance angle of the front edge should preferably be in the range 3°≦θ≦10°.If θ is smaller than this range, the cutting quality will decrease, and conversely, if the edge strength is large, descend.
又切刃稜と円筒状硬質焼結体の円周の円弧状と
がなす角度δも70゜≦δ≦90゜の範囲にすることで
切れ味の良いかつ強度に優れた刃型となる。 Also, by setting the angle δ between the cutting edge and the arc of the circumference of the cylindrical hard sintered body within the range of 70°≦δ≦90°, a blade shape with good sharpness and excellent strength can be obtained.
一方円筒状工具の外周又は内周に設けられて溝
は切粉を逃がすための溝であり、これがないと切
粉が詰り良好な切削ができない。 On the other hand, the grooves provided on the outer or inner periphery of the cylindrical tool are grooves for letting the chips escape, and without them, the chips would clog and good cutting would not be possible.
なお、前記硬質焼結体としては、ダイヤモンド
を70容量％以上含むダイヤモンド焼結体、高圧相
型窒化硼素を55容量％以上含む高圧相型窒化硼素
焼結体の如く、耐摩耗性の特に優れる焼結体を使
用するのが望ましい。 The hard sintered body may be a diamond sintered body containing 70% by volume or more of diamond, or a high-pressure phase boron nitride sintered body containing 55% or more by volume of high-pressure phase boron nitride, which has particularly excellent wear resistance. It is preferable to use a sintered body.
また、硬質焼結体１０の半径方向肉厚（巾）
は、切削抵抗並びに工具コストの低減のため３mm
以下とするのがよい。 In addition, the radial wall thickness (width) of the hard sintered body 10
is 3mm to reduce cutting force and tool cost.
The following should be used.
さらに、工具１３の直径も、20mm以下とするの
がよい。直径がそれ以上大きくなると、硬質焼結
体が非常に高価になつて経済効果が薄れるからで
ある。 Furthermore, the diameter of the tool 13 is also preferably 20 mm or less. This is because if the diameter becomes larger than that, the hard sintered body becomes very expensive and the economical effect is diminished.
そのほか、硬質焼結体１０の成形時に、その形
を第６図に示す様な形にしておくと、刃立作業時
の研削代が少なくて済む。 In addition, if the hard sintered body 10 is formed into a shape as shown in FIG. 6, the amount of grinding required during the cutting operation can be reduced.
(ニ) 効果
以上の通り、本考案の穴あけ工具は、硬質焼結
体を環状に形成したので、切刃の加工が容易であ
り、かつシヤンクに対する接合面積の増大化によ
り接合強度も充分に確保でき、従つて、小径穴加
工用穴あけ工具への硬質焼結体の採用が可能にな
る。また、硬質焼結体の特性を生かせるだけでな
く、中心部を切り残す方式であるので切削抵抗も
小さくなり、小径の穴加工を効率良く行なえる。
又、切刃のすくい角を適切な正の角度にし、かつ
切刃に傾き角を付けて中凹の形状にしているため
FRP（強化繊維プラスチツク）の穴あけにおいて
は、工具の抜け際のセンイのムシレのない良好な
穴を加工することができ、又寿命も長い。(d) Effects As mentioned above, the drilling tool of the present invention has a hard sintered body formed into an annular shape, so the cutting edge can be easily machined, and the joint area with the shank is increased to ensure sufficient joint strength. Therefore, it becomes possible to use a hard sintered body in a drilling tool for drilling small diameter holes. In addition to making use of the characteristics of the hard sintered body, cutting resistance is also reduced because the center portion is left uncut, allowing for efficient drilling of small diameter holes.
In addition, the rake angle of the cutting edge is set to an appropriate positive angle, and the cutting edge is tilted to form a concave shape.
When drilling holes in FRP (reinforced fiber plastic), it is possible to make good holes without any cracks when the tool is pulled out, and it also has a long life.
第１図は本考案の穴あけ工具の一例を示す正面
図である。第２図は硬質焼結体の一例を示す図、
第３図はホールソーの斜視図、第４図は、ホール
ソーに対する硬質焼結体の使用の一例を示す斜視
図、第５図は、本考案に採用する硬質焼結体の基
本形状を示す斜視図、第６図は切刃を形成した硬
質焼結体とシヤンクの接合前の斜視図、第７図は
公知のツイストドリルを示す図、第８図は本考案
の実施例の正面図、第９図は刃先部の側面図であ
る。
４……シヤンク、１０……硬質焼結体、１１…
…台金、１２……切刃、１３……穴あけ工具、１
４……溝。
FIG. 1 is a front view showing an example of the drilling tool of the present invention. Figure 2 is a diagram showing an example of a hard sintered body;
Fig. 3 is a perspective view of a hole saw, Fig. 4 is a perspective view showing an example of the use of a hard sintered body for a hole saw, and Fig. 5 is a perspective view showing the basic shape of the hard sintered body adopted in the present invention. , Fig. 6 is a perspective view of the hard sintered body forming the cutting edge and the shank before joining, Fig. 7 is a view showing a known twist drill, Fig. 8 is a front view of the embodiment of the present invention, Fig. 9 The figure is a side view of the cutting edge. 4...Shank, 10...Hard sintered body, 11...
...base metal, 12...cutting blade, 13...drilling tool, 1
4...Groove.
Claims (1)
成し、これを前記硬質焼結体後面に接合された
台金を介して円筒状シヤンク先端に固着しかつ
該切刃の半径方向にすくい角αが5゜≦α≦20゜
であり、軸方向のすくい角βが3゜≦β≦10゜で
あり、かつ切刃正面に中凹になるように切刃傾
き角γが15゜≦γ≦5゜であることを特徴とする
穴あけ工具。 (2) 上記穴あけ工具の外周もしくは内周あるいは
内外周ともに少なくとも１条の真直又は捻れた
溝が形成されてなることを特徴とする実用新案
登録請求の範囲第(1)項記載の穴あけ工具。 (3) 上記穴あけ工具において正面刃の逃げ角θが
3゜≦θ≦10゜である事を特徴とする実用新案登
録請求の範囲第(1)項乃至第(2)項のいずれかに記
載の穴あけ工具。 (4) 上記穴あけ工具において、切刃稜と環状硬質
焼結体の内周の円弧が交わつて成す角度δが正
面より見て70゜≦δ≦90゜に形成されている事を
特徴とする実用新案登録請求の範囲第(1)項乃至
第(3)項記載の穴あけ工具。 (5) 前記硬質焼結体がダイヤモンドを主成分とす
るダイヤモンド焼結体であることを特徴とする
実用新案登録請求の範囲第(1)項乃至第(4)項記載
のいずれかの穴あけ工具。 (6) 前記硬質焼結体が高圧相型窒化硼素を主成分
とする高圧相型窒化硼素焼結体であることを特
徴とする実用新案登録請求の範囲第第(1)項乃至
第(5)項のいずれかに記載の穴あけ工具。 (7) 前記硬質焼結体の半径方向肉厚（巾）を３mm
以下としたことを特徴とする実用新案登録請求
の範囲第(1)項乃至第(2)項のいずれかに記載の穴
あけ工具。 (8) 前記硬質焼結体及び本体の径を20mm以下とし
たことを特徴とする実用新案登録請求の範囲第
(1)項乃至第(7)項のいずれかに記載の穴あけ工
具。[Claims for Utility Model Registration] (1) A cutting edge is formed at the tip of a hard sintered body formed in an annular shape, and this is connected to the tip of a cylindrical shank via a base metal joined to the rear surface of the hard sintered body. The cutting edge has a radial rake angle α of 5°≦α≦20°, an axial rake angle β of 3°≦β≦10°, and is concave in the front of the cutting blade. A drilling tool characterized by a cutting edge inclination angle γ of 15°≦γ≦5°. (2) The drilling tool according to claim (1) of the utility model registration, characterized in that at least one straight or twisted groove is formed on the outer periphery, the inner periphery, or both the inner and outer peripheries of the drilling tool. (3) In the above drilling tool, the relief angle θ of the front blade is
The drilling tool according to any one of claims (1) to (2) for utility model registration, characterized in that 3°≦θ≦10°. (4) The above-mentioned drilling tool is characterized in that the angle δ formed by the intersection of the cutting edge and the arc of the inner circumference of the annular hard sintered body is 70°≦δ≦90° when viewed from the front. A drilling tool according to claims (1) to (3) of the utility model registration claim. (5) The drilling tool according to any one of claims (1) to (4) of the utility model registration claim, wherein the hard sintered body is a diamond sintered body containing diamond as a main component. . (6) Utility model registration claims 1 to 5, characterized in that the hard sintered body is a high-pressure phase type boron nitride sintered body containing high-pressure phase type boron nitride as a main component. Drilling tool described in any of paragraphs ). (7) The radial wall thickness (width) of the hard sintered body is 3 mm.
A drilling tool according to any one of claims (1) to (2) of the utility model registration claim, which is characterized by the following. (8) Utility model registration claim No. 1 characterized in that the hard sintered body and the main body have a diameter of 20 mm or less.
The drilling tool described in any of paragraphs (1) to (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10815484U JPS6124111U (en) | 1984-07-16 | 1984-07-16 | drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10815484U JPS6124111U (en) | 1984-07-16 | 1984-07-16 | drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6124111U JPS6124111U (en) | 1986-02-13 |
| JPH031134Y2 true JPH031134Y2 (en) | 1991-01-16 |
Family
ID=30667364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10815484U Granted JPS6124111U (en) | 1984-07-16 | 1984-07-16 | drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6124111U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4566375B2 (en) * | 2000-09-26 | 2010-10-20 | 天龍製鋸株式会社 | Metal bond tool |
| JP4217808B2 (en) * | 2003-05-19 | 2009-02-04 | 株式会社ミスミ特殊 | Core drill |
| KR200455894Y1 (en) * | 2009-01-08 | 2011-09-30 | 오명환 | Core drill |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62808U (en) * | 1985-06-17 | 1987-01-07 |
-
1984
- 1984-07-16 JP JP10815484U patent/JPS6124111U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62808U (en) * | 1985-06-17 | 1987-01-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6124111U (en) | 1986-02-13 |
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