JP3591148B2 - Rotary cutting tool blade - Google Patents

Rotary cutting tool blade Download PDF

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Publication number
JP3591148B2
JP3591148B2 JP19672096A JP19672096A JP3591148B2 JP 3591148 B2 JP3591148 B2 JP 3591148B2 JP 19672096 A JP19672096 A JP 19672096A JP 19672096 A JP19672096 A JP 19672096A JP 3591148 B2 JP3591148 B2 JP 3591148B2
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JP
Japan
Prior art keywords
blade
cutting
peripheral side
width
annular groove
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 - Fee Related
Application number
JP19672096A
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Japanese (ja)
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JPH1034597A (en
Inventor
英澄 岡村
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Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority to JP19672096A priority Critical patent/JP3591148B2/en
Publication of JPH1034597A publication Critical patent/JPH1034597A/en
Application granted granted Critical
Publication of JP3591148B2 publication Critical patent/JP3591148B2/en
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  • Nonmetal Cutting Devices (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は大径の孔を被穿孔物に明けるための回転切削工具の刃に関するものである。
【０００２】
【従来の技術】
大径の孔を被穿孔物に明けるための回転切削工具としては、円筒状の刃体の開口縁に刃を形成したホールソーと称されているもののほかに、円周上に複数の刃を配したタイプのものがある。このタイプのものでは図５に示すように、孔の内周面となる外周側の切削用の切り込み刃２と、内周側の切削用の掻き出し刃３とを備えたものとし、軸５を中心とするこれらの刃２，３の回転で被穿孔物７を切り抜いて孔を明ける。
【０００３】
ところで従来は上記２種の刃２，３の刃幅を同一としていた。つまり、両刃２，３によって切削される環状溝の幅（切断幅）をＡとすると、両刃２，３の刃幅を共に切断幅Ａの６０〜８０％の値とし、切り込み刃２を外周側に、掻き出し刃３を内周側にふった状態で軸５を中央に備えたベース６に固定していた。
【０００４】
【発明が解決しようとする課題】
この場合、刃２，３が軸５をはさむ位置に設けられているために、各刃２，３と溝との間にできる隙間は同一方向に発生するものであり、このために切削中に矢印Ｃ方向で示す横振動が発生してしまうという問題を有している。
本発明はこのような点に鑑み為されたものであり、その目的とするところは横振動を発生することなく穿孔を行うことができる回転切削工具の刃を提供するにある。
【０００５】
【課題を解決するための手段】
しかして本発明は、被穿孔物に対する環状溝の切削で被穿孔物に孔をあける回転切削工具の刃において、環状溝の外周側の切削用の刃と、内周側の切削用の刃とを備えるとともに、外周側の刃と内周側の刃とによって切削される環状溝の幅よりも外周側切削用の刃の刃幅が小さく、且つ内周側切削用の刃の刃幅が上記環状溝の幅と同じであり、外周側切削用の刃が内周側切削用の刃より高くなっていることに特徴を有している。内周側切削用の刃が横触れの原因となる隙間の発生を防ぐものである。
【０００６】
そして外周側切削用の刃及び内周側切削用の刃を平板状とすることも好ましい。
【０００７】
【発明の実施の形態】
本発明の実施の形態の一例について説明すると、図１及び図２において、図中６は取付軸６０を備えたベースであり、このベース６の前面中央からは軸５が突設されている。またベース６の一端には切り込み刃２と制限刃４とが取り付けられており、ベース６の他端には掻き出し刃３と制限刃４とが取り付けられている。図中６１はこれらの同一円周上に配される刃２，３，４の取付固定のためのビスである。
【０００８】
この回転切削工具の刃は、上記取付軸６０を利用して電動ドリルのような電動工具に装着し、被穿孔物７への穴明けは軸５の先端を明けようとする孔の中心に位置させた状態で回転させることによって、図３に示すように、切り込み刃２による切削と掻き出し刃３による切削とを行うことで環状の溝を被穿孔物７に切削していき、被穿孔物７を貫通するまで環状溝を切削していくことによって被穿孔物７に孔を明けるわけであり、この時、制限刃４は被穿孔物７への１回転当たりの切り込み量が深くなりすぎることを防いでスムーズな穴明けを行えるようにしている。
【０００９】
ここで、上記環状溝の外周側を切削することになる切り込み刃２の刃幅Ｗ２は、環状溝の幅である切削幅Ａの６０〜８０％としているが、上記環状溝の内周側を切削することになる掻き出し刃３の刃幅Ｗ３は、切削幅Ａと同一としている。このために、図４から明らかなように、軸５と掻き出し刃３とによって横触れが規制されることになり、従って横触れが発生せず、これに伴って切削時の負荷が小さくなるために小さな力で切削を行うことができるとともに切削速度の向上を得られて作業効率がアップするものである。
【００１０】
また、ここにおける切り込み刃２と掻き出し刃３とでは、切り込み刃２の方を掻き出し刃３よりも０．１〜０．５ｍｍほど高くしてある。この差ｘがあるために、図３の（ａ）から（ｈ）まで順に示している切削にあたり、切り込み刃２による環状溝の外周側の切削が掻き出し刃３による切削に先行するものであり、従って、環状溝の外周側、つまりは明けられた孔の内周面はきれいな仕上がりとなる。なお、環状溝の内周側の仕上がりは「ケバ」等が生じるものとなるが、環状溝の内側は最終的に除去される排材となる部分であるから問題はない。
【００１１】
ところで、上記の各刃２，３，４は、先端に超硬チップ２０，３０，４０が接合されたものとして形成されているのであるが、これら刃２，３，４は軸５と直交する面で切断した断面形状が軸５を中心とする円弧状のものを用いずに、平板状のものを用いて、切り込み刃２と掻き出し刃３とについては、超硬チップ２０，３０の幅で前記刃幅Ｗ２，Ｗ３を確保するとともに、超硬チップ２０，３０を除く部分の幅は上記刃幅Ｗ２，Ｗ３より小さくして切削する環状溝内に収まるものとすることで、平板状のものであることによる環状溝の切削の邪魔になることがないようにしている。なお、制限刃４は超硬チップ４０も含めてほぼ同じ幅であるが、やはり環状溝内に収まるものとしているために切削の邪魔になることはない。そして、断面円弧状のものでは、その製造が困難であるために非常にコストが高いものとなるが、ここで用いている各刃２，３，４は平板状であるために、はるかにローコストで製造することができる。
【００１２】
【発明の効果】
以上のように本発明においては、外周側の刃と内周側の刃とによって切削される環状溝の幅よりも外周側切削用の刃の刃幅が小さく、且つ内周側切削用の刃の刃幅が上記環状溝の幅と同じで外周側切削用の刃の刃幅よりも内周側切削用の刃の刃幅を大きくしているために、内周側切削用の刃が横触れの原因となる隙間の発生を防ぐものであり、このために、安定した切削作業を小さい力で且つスピーディに行うことができ、作業効率を高くすることができ、しかも外周側切削用の刃を内周側切削用の刃より高くしているために、被穿孔物に明けた孔の内周面の仕上がりをきれいに保つことができる。
【００１３】
そして外周側切削用の刃及び内周側切削用の刃を平板状とすれば、断面円弧状のものを用いる場合に比して、はるかに低コストで製造することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態の一例を示すもので、（ａ）は平面図、（ｂ）は正面図である。
【図２】同上の側面図である。
【図３】（ａ）〜（ｈ）は同上の切削過程を示す説明図である。
【図４】同上の説明図である。
【図５】従来例の横触れ発生原因を示す説明図である。
【符号の説明】
２ 切り込み刃
３ 掻き出し刃[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a rotary cutting tool blade for drilling a large-diameter hole in an object to be drilled.
[0002]
[Prior art]
As a rotary cutting tool for drilling a large-diameter hole in an object to be drilled, in addition to a so-called hole saw having a blade formed on the opening edge of a cylindrical blade, a plurality of blades are arranged on the circumference. There is a type that did. As shown in FIG. 5, this type includes a cutting blade 2 for cutting on the outer peripheral side, which is an inner peripheral surface of the hole, and a scraping blade 3 for cutting, on the inner peripheral side. By rotating the blades 2 and 3 about the center, the object 7 is cut out to make a hole.
[0003]
Conventionally, the two types of blades 2 and 3 have the same blade width. That is, assuming that the width (cutting width) of the annular groove cut by the two blades 2 and 3 is A, the blade width of both the blades 2 and 3 is set to a value of 60 to 80% of the cutting width A, and the cutting blade 2 is set on the outer peripheral side. Then, the shaft 5 is fixed to the base 6 provided at the center while the scraping blade 3 is swung to the inner peripheral side.
[0004]
[Problems to be solved by the invention]
In this case, since the blades 2 and 3 are provided at positions sandwiching the shaft 5, a gap formed between each of the blades 2 and 3 and the groove is generated in the same direction. There is a problem that the lateral vibration shown by the arrow C direction occurs.
The present invention has been made in view of such a point, and an object of the present invention is to provide a rotary cutting tool blade that can perform drilling without generating lateral vibration.
[0005]
[Means for Solving the Problems]
Thus, the present invention provides a blade of a rotary cutting tool for drilling a hole in an object to be drilled by cutting an annular groove on the object to be drilled, wherein a cutting blade on an outer peripheral side of the annular groove and a cutting blade on an inner peripheral side are provided. The width of the outer peripheral side cutting blade is smaller than the width of the annular groove cut by the outer peripheral side blade and the inner peripheral side blade, and the blade width of the inner peripheral side cutting blade is above. It is the same as the width of the annular groove, and is characterized in that the outer peripheral cutting blade is higher than the inner peripheral cutting blade . This is to prevent the gap for causing the inner peripheral cutting blade to touch the side.
[0006]
And it is also preferable that the blade and blade for the inner circumferential side cutting outer peripheral side cutting a flat plate shape.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An example of an embodiment of the present invention will be described. In FIGS. 1 and 2, reference numeral 6 in the drawings denotes a base provided with a mounting shaft 60, and a shaft 5 protrudes from the front center of the base 6. The cutting blade 2 and the limiting blade 4 are attached to one end of the base 6, and the scraping blade 3 and the limiting blade 4 are attached to the other end of the base 6. In the drawing, reference numeral 61 denotes a screw for mounting and fixing the blades 2, 3, and 4 arranged on the same circumference.
[0008]
The blade of this rotary cutting tool is mounted on an electric tool such as an electric drill using the mounting shaft 60, and the hole to be drilled 7 is located at the center of the hole to be drilled at the tip of the shaft 5. By rotating in this state, as shown in FIG. 3, by performing cutting with the cutting blade 2 and cutting with the scraping blade 3, an annular groove is cut into the drilled object 7, and the drilled object 7 is cut. By drilling the annular groove until it penetrates, the hole is drilled in the drilled object 7. At this time, the limiting blade 4 confirms that the cut amount per rotation of the drilled object 7 becomes too deep. Prevents smooth drilling.
[0009]
Here, the blade width W2 of the cutting blade 2 for cutting the outer peripheral side of the annular groove is set to be 60 to 80% of the cutting width A, which is the width of the annular groove, but the inner peripheral side of the annular groove is set. The blade width W3 of the scraping blade 3 to be cut is the same as the cutting width A. For this reason, as is clear from FIG. 4, side contact is restricted by the shaft 5 and the scraping blade 3, so that side contact does not occur and the load at the time of cutting is reduced accordingly. In addition, cutting can be performed with a small force, and a cutting speed can be improved, thereby improving work efficiency.
[0010]
Further, the cutting blade 2 and the scraping blade 3 here are higher than the cutting blade 3 by about 0.1 to 0.5 mm. Due to the difference x, in the cutting shown in order from (a) to (h) in FIG. 3, the cutting on the outer peripheral side of the annular groove by the cutting blade 2 precedes the cutting by the scraping blade 3, Therefore, the outer peripheral side of the annular groove, that is, the inner peripheral surface of the opened hole has a beautiful finish. Note that the finish on the inner peripheral side of the annular groove may have a “burr” or the like, but there is no problem since the inside of the annular groove is a portion that will eventually be removed material.
[0011]
By the way, each of the blades 2, 3, and 4 is formed such that the carbide tips 20, 30, and 40 are joined to the tip, and the blades 2, 3, and 4 are orthogonal to the shaft 5. Instead of using an arc-shaped one having a cross section cut along a plane centered on the axis 5 and using a flat one, the cutting blade 2 and the scraping blade 3 have a width of the carbide tips 20 and 30. The blade widths W2 and W3 are ensured, and the width of the portion excluding the carbide tips 20 and 30 is smaller than the blade widths W2 and W3 and is set in the annular groove to be cut, so that a flat plate-shaped one is obtained. This does not hinder cutting of the annular groove. Although the limiting blade 4 has substantially the same width including the carbide tip 40, it does not hinder cutting because it is also contained in the annular groove. In the case of an arc-shaped cross section, the cost is extremely high because of its difficulty in manufacturing. However, since each of the blades 2, 3, and 4 used here is a flat plate, the cost is much lower. Can be manufactured.
[0012]
【The invention's effect】
As described above, in the present invention, the blade width of the outer peripheral side cutting blade is smaller than the width of the annular groove cut by the outer peripheral side blade and the inner peripheral side blade, and the inner peripheral side cutting blade. The blade width of the inner peripheral side cutting blade is the same as the width of the above-mentioned annular groove, and the blade width of the inner peripheral side cutting blade is larger than the blade width of the outer peripheral side cutting blade. is intended to prevent the causative gap occurrence of touch, for this, and a stable small force cutting operation could be carried out speedily, it is possible to increase the working efficiency, moreover blade outer peripheral side cutting Is higher than the inner peripheral cutting blade, the finish of the inner peripheral surface of the hole formed in the object to be drilled can be kept clean.
[0013]
If the outer peripheral side cutting blade and the inner peripheral side cutting blade are formed in a flat plate shape, it can be manufactured at a much lower cost as compared with a case where an arc-shaped cross section is used.
[Brief description of the drawings]
FIG. 1 shows an example of an embodiment of the present invention, in which (a) is a plan view and (b) is a front view.
FIG. 2 is a side view of the same.
FIGS. 3 (a) to 3 (h) are explanatory views showing a cutting process of the above.
FIG. 4 is an explanatory diagram of the above.
FIG. 5 is an explanatory view showing a cause of occurrence of lateral touch in a conventional example.
[Explanation of symbols]
2 cutting blade 3 scraping blade

Claims (2)

被穿孔物に対する環状溝の切削で被穿孔物に孔をあける回転切削工具の刃であって、環状溝の外周側の切削用の刃と、内周側の切削用の刃とを備えるとともに、外周側の刃と内周側の刃とによって切削される環状溝の幅よりも外周側切削用の刃の刃幅が小さく、且つ内周側切削用の刃の刃幅が上記環状溝の幅と同じであり、外周側切削用の刃が内周側切削用の刃より高くなっていることを特徴とする回転切削工具の刃。A blade of a rotary cutting tool that drills a hole in a drilled object by cutting an annular groove on the drilled object, comprising a cutting blade on the outer peripheral side of the annular groove and a cutting blade on the inner peripheral side, The blade width of the outer peripheral side cutting blade is smaller than the width of the annular groove cut by the outer peripheral side blade and the inner peripheral side blade, and the blade width of the inner peripheral side cutting blade is smaller than the width of the annular groove. A rotary cutting tool blade , wherein the outer peripheral cutting blade is higher than the inner peripheral cutting blade. 外周側切削用の刃及び内周側切削用の刃は平板状であることを特徴とする請求項１記載の回転切削工具の刃。 The blade for a rotary cutting tool according to claim 1, wherein the outer peripheral side cutting blade and the inner peripheral side cutting blade are flat .
JP19672096A 1996-07-25 1996-07-25 Rotary cutting tool blade Expired - Fee Related JP3591148B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19672096A JP3591148B2 (en) 1996-07-25 1996-07-25 Rotary cutting tool blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19672096A JP3591148B2 (en) 1996-07-25 1996-07-25 Rotary cutting tool blade

Publications (2)

Publication Number Publication Date
JPH1034597A JPH1034597A (en) 1998-02-10
JP3591148B2 true JP3591148B2 (en) 2004-11-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10766163B2 (en) * 2013-12-10 2020-09-08 Robert Bosch Tool Corporation Blade attachment for an oscillating tool
CN116872378B (en) * 2023-07-03 2024-09-13 广州一建建设集团有限公司 Auxiliary tool for perforating holes of gypsum board bottom box and perforating method of gypsum board bottom box holes

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