JP2009095943A - Protective cap of cutting tool - Google Patents

Protective cap of cutting tool Download PDF

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JP2009095943A
JP2009095943A JP2007270733A JP2007270733A JP2009095943A JP 2009095943 A JP2009095943 A JP 2009095943A JP 2007270733 A JP2007270733 A JP 2007270733A JP 2007270733 A JP2007270733 A JP 2007270733A JP 2009095943 A JP2009095943 A JP 2009095943A
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protective cap
cutting tool
tube part
cutting
end mill
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Satoshi Yoshioka
聡 吉岡
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Access Holdings Co Ltd
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Access Holdings Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent falling, while securing smooth working efficiency when attaching or detaching a protective cap. <P>SOLUTION: This protective cap 1 is constituted of a substantially cylindrical tube part 2 for storing a cutting blade part 6 of an end mill 5 as a cutting tool and a closing part 3 for closing a distal end of the tube part 2. The tube part 2 has elliptical cross section. Projected lines 4a extending in parallel to a material axis of the tube part 2 are oppositely arranged on an internal surface of the tube part 2 on an extension line of a minor axis in the elliptical cross section. In the same way, projected lines 4b extending in parallel to the material axis of the tube part 2 are oppositely arranged on an extension line of a major axis. The projected line 4b is constituted of each one projected line, while the projected line 4a is constituted of each two projected lines, and 6 projected lines in total are formed on the internal surface of the tube part 2. The tube part 2 and the closing part 3 are integrally formed by synthetic resin such as soft vinyl chloride resin as an elastic material. The closing part 3 plays a role to prevent the end mill 5 from passing through the tube part 2 and being exposed from the distal end of the tube part 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ドリル、エンドミルといった切削工具に被せる切削工具の保護キャップに関する。   The present invention relates to a protective cap for a cutting tool to be put on a cutting tool such as a drill or an end mill.

切削加工に用いる工作機械には、切削工具を回転させながらその材軸方向に進退させることで被加工物に穴を加工形成することが可能なボール盤や、切削工具を回転させながらその材軸と直交する方向に移動させることで被加工物に溝を加工形成することが可能なフライス盤がよく知られている。   Machine tools used for cutting work include a drilling machine that can form holes in a workpiece by moving the cutting tool forward and backward in the direction of the material axis, and the material axis while rotating the cutting tool. A milling machine capable of machining and forming grooves in a workpiece by moving in an orthogonal direction is well known.

これらの工作機械は、木工、金属加工、コンクリート加工等に広く用いられており、特に、フライス盤は、金属金型を製作する際に多用されている。   These machine tools are widely used for woodworking, metal processing, concrete processing, and the like, and in particular, milling machines are frequently used when manufacturing metal molds.

ここで、ボール盤に取り付ける切削工具としてはドリルがあり、フライス盤に取り付ける切削工具としてエンドミルがあるが、これらの切削工具はいずれも、鋼製丸棒の先端に螺旋状の溝を切ってあり、該溝と溝の間に形成された切刃によって被加工物を加工形成することができるようになっている。   Here, there is a drill as a cutting tool attached to a drilling machine, and an end mill as a cutting tool attached to a milling machine. All of these cutting tools have a spiral groove cut at the tip of a steel round bar, A workpiece can be formed by a cutting blade formed between the grooves.

上述した切削工具は、そのシャンク部を工作機械のチャックに着脱できるようになっており、所望の径の切削工具に適宜交換できるようになっている一方、上述したように切削工具の周面には鋭利な切刃が形成してあるため、着脱作業や保管作業の際には慎重に作業しないと、思わぬ怪我をする懸念があり、切削工具を取り扱うにあたっては、安全面での配慮が必要となる。   The cutting tool described above can be attached to and detached from the chuck of the machine tool, and the cutting tool can be appropriately replaced with a cutting tool having a desired diameter. Has a sharp cutting edge, there is a risk of unexpected injury if you do not work carefully when attaching and detaching or storing it, and safety considerations are required when handling cutting tools. It becomes.

そのため、ドリルやエンドミルといった切削工具にゴム製やシリコン製で形成したチューブ状のキャップを嵌めて安全性を確保すると同時に、切刃の欠けを防止することが一般的に行われている。   Therefore, it is a common practice to secure a safety by fitting a tube-like cap made of rubber or silicon to a cutting tool such as a drill or an end mill and at the same time prevent chipping of the cutting edge.

特開2006−341343JP 2006-341343 A 特開2000−334683JP 2000-334683 A

しかしながら、上述した方法では、工具に嵌めたキャップがすぐに抜け落ちてしまうという問題や、逆に工具周面とチューブ内面との摩擦によって装着や取外しが困難になるという問題を生じていた。   However, the above-described method has a problem that the cap fitted to the tool is easily removed, and conversely, it is difficult to mount and remove the cap due to friction between the tool peripheral surface and the tube inner surface.

かかる状況下、キャップ内面にクッション層を設けてなる工具用保護カバーが開示されており(特許文献1)、かかる発明によれば、クッション層による切刃の保護と保護カバーを付けた状態での着脱が可能であるとともに、クッション層によって着脱が容易である旨、記載されている。   Under such circumstances, a protective cover for a tool in which a cushion layer is provided on the inner surface of the cap is disclosed (Patent Document 1). According to the invention, the cutting blade is protected by the cushion layer and the protective cover is attached. It is described that it can be attached and detached and is easily attached and detached by the cushion layer.

しかしながら、上述した発明においては、工具周面とクッション層との間に生じる単純な摩擦力によって脱落の防止を図っているため、脱落防止作用を高めようとすれば、おのずと装着時や取外し時の抵抗が高くなって作業性が低下し、装着作業性や取外し作業性を高めようとすれば、摩擦を小さくしなければならないため、脱落の懸念が高くなるという二律背反の問題が生じ、その意味で上述した問題を本質的に改善した発明はいまだなされていないのが現状である。   However, in the above-described invention, the simple frictional force generated between the tool peripheral surface and the cushion layer is used to prevent the drop-off. If resistance is increased and workability is reduced, and if it is attempted to improve workability and removal workability, friction must be reduced. At present, no invention has been made which essentially improves the above-mentioned problems.

本発明は、上述した事情を考慮してなされたもので、着脱時のスムーズな作業性を確保しつつ脱落を確実に防止することが可能な切削工具の保護キャップを提供することを目的とする。   The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a protective cap for a cutting tool that can surely prevent dropping while ensuring smooth workability during attachment and detachment. .

上記目的を達成するため、本発明に係る切削工具の保護キャップは請求項1に記載したように、弾性材料で形成されたほぼ円筒状の筒部と該筒部の先端を塞ぐ閉塞部とからなるとともに、該筒部の材軸と平行に延びる突条を前記筒部の内面にかつ対向位置に設けたものである。   In order to achieve the above object, a protective cap for a cutting tool according to the present invention comprises, as described in claim 1, a substantially cylindrical tube portion made of an elastic material and a blocking portion that closes the tip of the tube portion. In addition, a ridge extending in parallel with the material axis of the cylindrical portion is provided on the inner surface of the cylindrical portion and at a facing position.

また、本発明に係る切削工具の保護キャップは、前記筒部を楕円状断面とし、該楕円状断面における短軸の延長線上に前記突条を配置したものである。   Moreover, the protective cap of the cutting tool which concerns on this invention makes the said cylindrical part the elliptical cross section, and has arrange | positioned the said protrusion on the extension line | wire of the short axis in this elliptical cross section.

また、本発明に係る切削工具の保護キャップは、前記楕円状断面における長軸の延長線上に前記突条を配置したものである。   Moreover, the protective cap of the cutting tool which concerns on this invention arrange | positions the said protrusion on the extended line of the long axis in the said elliptical cross section.

本発明に係る切削工具の保護キャップにおいては、筒部の内面に突条を形成してあり、切削工具を保護キャップの筒部に挿入した状態(切削工具に保護キャップが被せられた状態)では、かかる突条が切削工具の周面に形成された切刃に当接する。また、突条は、筒部の材軸と平行に延びているため、切削工具の周面に螺旋状に形成された切刃とは、当接箇所が交差状態となる。   In the protective cap of the cutting tool according to the present invention, the protrusion is formed on the inner surface of the cylindrical portion, and the cutting tool is inserted into the cylindrical portion of the protective cap (the cutting tool is covered with the protective cap). Such a protrusion contacts with a cutting blade formed on the peripheral surface of the cutting tool. Moreover, since the ridge extends in parallel with the material axis of the cylindrical portion, the contact portion intersects with the cutting blade spirally formed on the peripheral surface of the cutting tool.

したがって、切削工具の材軸に沿った方向に保護キャップをまっすぐ引き抜こうとすると、切削工具の切刃が突条に食い込んで引抜き移動が阻止され、過度な引抜き力を加えない限り、保護キャップの引抜きが確実に防止される。   Therefore, if you try to pull the protective cap straight in the direction along the material axis of the cutting tool, the cutting edge of the cutting tool will bite into the ridge and the pulling movement will be blocked, and the protective cap will be pulled out unless an excessive pulling force is applied. Is reliably prevented.

一方、切削工具の切刃が右螺旋刃(右ねじれ)であるとした場合、保護キャップを左に回転させながら引抜き力を加えると、切刃は突条に食い込まないため、保護キャップをスムーズに切削工具から取り外すことができる。   On the other hand, if the cutting blade of the cutting tool is a right spiral blade (right helix), if the pulling force is applied while rotating the protective cap counterclockwise, the cutting blade will not bite into the ridge, so the protective cap will be smooth. It can be removed from the cutting tool.

これは、ボルトに螺合されたナットを取り外すときの原理、すなわちナットを単に引き抜こうとしても抜けないが、左に回せば、螺合してあったボルトからナットを取り外すことができる原理と類似している。   This is similar to the principle of removing a nut screwed into a bolt, that is, the principle that a nut can be removed from a screwed bolt if it is turned to the left, although it cannot be removed by simply pulling the nut. is doing.

但し、ボルトナットの場合は、雄ネジと雌ネジとの機械的噛合によって両者の動きが案内される構造であるため、ネジ山のピッチや高さ(深さ)が厳密に一致していなければならず、その結果として、ボルトに対するナットの動きは1回転ごとの送り量が一意に定まるのに対し、本発明に係る保護キャップの場合は、引抜き操作の際に回転操作を行うことで、螺旋刃が突条に食い込まないようにすることができるため、切削工具に対する保護キャップの回転数は、後述する最適回転数以上で任意の値を取り得る。   However, in the case of bolts and nuts, since the movement of both is guided by mechanical engagement of male and female screws, the pitch and height (depth) of the threads must be exactly the same. However, as a result, the movement of the nut with respect to the bolt is uniquely determined by the amount of feed per rotation, whereas in the case of the protective cap according to the present invention, the rotation operation is performed during the pulling operation, so Since it is possible to prevent the blade from biting into the ridge, the rotation speed of the protective cap with respect to the cutting tool can take an arbitrary value at or above the optimal rotation speed described later.

すなわち、本発明に係る保護キャップの使用方法は、引抜きによって螺旋刃が突条に食い込まないように連続的に回転させることを特徴とするものであって、保護キャップを引き抜く際、切削工具に形成された切刃の螺旋ピッチと同じピッチで回転させれば、保護キャップを最も早く取り外すことができる(以下、これを最適回転数と呼ぶ)。   That is, the method of using the protective cap according to the present invention is characterized in that it is continuously rotated so that the spiral blade does not bite into the ridge by pulling, and when the protective cap is pulled out, it is formed on the cutting tool. The protective cap can be removed earliest by rotating it at the same pitch as the helical pitch of the cutting blade (hereinafter referred to as the optimum rotational speed).

一方、最適回転数よりも回転数が少なければ、引抜き動作によって切刃が突条に食い込み、引抜きが阻止されるが、最適回転数よりも回転数が多い場合については、切刃と突条との相対的な動きは、切刃が突条に食い込む動きと逆になり、単に切刃が突条の当接面を相対的に滑っていくだけとなって、いわば空回り状態になるだけなので、取り外しには時間がかかるものの、引抜きは何ら阻止されない。   On the other hand, if the number of rotations is less than the optimum number of rotations, the cutting blade bites into the protrusions by the drawing operation, and the drawing is prevented, but when the number of rotations is higher than the optimum number of rotations, The relative movement of is opposite to the movement of the cutting edge biting into the ridge, and the cutting edge simply slides relatively on the abutment surface of the ridge, so it is in an idle state. Although it takes time, pulling out is not prevented.

そのため、本発明に係る保護キャップは、切削工具に対して保護キャップをまっすぐに引き抜いたとき、切削工具の螺旋刃が突条に食い込むように、筒部の内径や突条の突設高さが設定されている限り、螺旋刃の形状や刃の数とは関係なく、どのような切削工具にも適用できるものであり、その意味でボルトナット構造とは本質的に相違するものであって、きわめて汎用性が高い保護キャップであると云える。   Therefore, the protective cap according to the present invention has an inner diameter of the cylindrical portion and a protruding height of the protrusion so that when the protective cap is pulled straight out of the cutting tool, the spiral blade of the cutting tool bites into the protrusion. As long as it is set, it can be applied to any cutting tool regardless of the shape of the spiral blade and the number of blades. In that sense, it is essentially different from the bolt and nut structure, It can be said that this is a very versatile protective cap.

なお、切削工具を保護キャップ内に挿入し又は保護キャップを切削工具に被せるときは、切刃の角度が逆になっているため、まっすぐに挿入し又は被せても突条への食い込み現象は発生せず、スムーズに挿入し又は被せることができる。   In addition, when the cutting tool is inserted into the protective cap or the protective cap is put on the cutting tool, the angle of the cutting edge is reversed, so that the phenomenon of biting into the ridge occurs even if it is inserted straight or covered. And can be inserted or covered smoothly.

筒部は、一対の突条の先端同士の間隔が切削工具の切刃部の外径よりも若干小さくなるようにかつ弾性材料で形成する。このように形成することにより、筒部の中に切削工具を容易に挿入し、又は切削工具に容易に被せることができるとともに、挿入された状態又は被せられた状態で切削工具に刻まれた螺旋状の切刃を筒部の内面に形成された突条に当接させることができる。   The cylindrical portion is formed of an elastic material so that the distance between the tips of the pair of protrusions is slightly smaller than the outer diameter of the cutting edge portion of the cutting tool. By forming in this way, the cutting tool can be easily inserted into the cylindrical portion, or can be easily covered with the cutting tool, and the spiral engraved on the cutting tool in the inserted state or the covered state. The shaped cutting blade can be brought into contact with the ridge formed on the inner surface of the cylindrical portion.

筒部の先端を塞ぐ閉塞部は、筒部と別体でもよいが、製造上の便宜から筒部と一体形成するのが望ましい。かかる閉塞部についてはあえて弾性材料で形成する必要はないが、筒部と一体形成する場合においては、同じ材質、例えば軟質塩化ビニル樹脂で形成してもかまわない。かかる閉塞部は、切削工具が筒部を貫通して該筒部の先端から露出するのを防止する役割を果たす。   The closing portion that closes the tip of the cylindrical portion may be a separate body from the cylindrical portion, but it is desirable to form it integrally with the cylindrical portion for the convenience of manufacturing. Such a blocking portion need not be formed of an elastic material, but may be formed of the same material, for example, a soft vinyl chloride resin when integrally formed with the tube portion. Such a blocking portion serves to prevent the cutting tool from penetrating the tube portion and being exposed from the tip of the tube portion.

突条は、切削工具の一方の側に当接したときに保護キャップ全体が他方の側に逃げてしまい、その結果、切刃による突条への食い込み作用が低下することがなきよう、筒部の内面に対向配置する。   When the ridge is in contact with one side of the cutting tool, the entire protective cap escapes to the other side, so that the biting action of the cutting blade on the ridge is not reduced. It is arranged opposite to the inner surface of the.

筒部は、円筒状断面としてもかまわないが、円筒状断面に代えて、楕円状断面とし、該楕円状断面における短軸の延長線上に前記突条を配置したならば、短軸方向が伸びて筒部が真円に近づくような変形を生じる余地がある分、適用可能な切削工具の外径サイズが拡がる。例えば、短軸方向の内径が16mm、長軸方向の内径が18mmとなるように筒部を形成しておけば、刃径16mmから刃径18mmまでの何種類かのエンドミルをひとつの保護キャップで対応することが可能になる。加えて、筒部を楕円状断面に形成することにより、真円の切削工具が挿入され又は真円の切削工具に被せられたとき、弾性材料で形成された筒部には、楕円状断面に戻ろうとする復元力が発生し、その復元力は、より大きな当接力となって突条を切刃に押し付けることとなり、上述した本発明の作用をより確実に生じさせることが可能となる。   The cylindrical portion may have a cylindrical cross section, but instead of the cylindrical cross section, an elliptical cross section is provided, and if the ridges are arranged on an extension line of the short axis in the elliptical cross section, the short axis direction extends. As a result, there is room for deformation that causes the cylindrical portion to approach a perfect circle, and the applicable outer diameter size of the cutting tool increases. For example, if the cylindrical part is formed so that the inner diameter in the minor axis direction is 16 mm and the inner diameter in the major axis direction is 18 mm, several types of end mills with a blade diameter of 16 mm to a blade diameter of 18 mm can be formed with one protective cap. It becomes possible to respond. In addition, by forming the cylindrical part in an elliptical cross section, the cylindrical part formed of an elastic material has an elliptical cross section when a perfect circular cutting tool is inserted or covered with a perfect circular cutting tool. A restoring force to return is generated, and the restoring force becomes a larger abutting force to press the ridge against the cutting edge, so that the above-described operation of the present invention can be more reliably generated.

楕円状断面に形成された筒部は、短軸に沿った内寸を外径とする切削工具の場合、短軸の延長線上に突条を配置するだけで上述の作用効果を奏するが、長軸の延長線上にも一対の突条を配置しておけば、長軸に沿った内寸を外径とする切削工具を挿入し又は該切削工具に被せた場合に、互いに直交配置された二組の突条が切削工具に当接することとなり、上述した本発明の作用効果はさらに高まる。   In the case of a cutting tool having an inner diameter along the minor axis as the outer diameter, the cylindrical portion formed in the elliptical cross section has the above-described effects only by placing a protrusion on the extended line of the minor axis. If a pair of ridges are also arranged on the extension line of the shaft, two cutting tools having an inner diameter along the major axis as an outer diameter are inserted or placed on the cutting tool. The set of protrusions comes into contact with the cutting tool, and the above-described operational effects of the present invention are further enhanced.

以下、本発明に係る切削工具の保護キャップの実施の形態について、添付図面を参照して説明する。なお、従来技術と実質的に同一の部品等については同一の符号を付してその説明を省略する。   Embodiments of a protective cap for a cutting tool according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

図1は、本実施形態に係る切削工具の保護キャップを示した斜視図、図2は断面図及び側面図である。これらの図でわかるように、本実施形態に係る保護キャップ1は、切削工具としてのエンドミル5の切刃部6を収容するほぼ円筒状の筒部2と、該筒部の先端を塞ぐ閉塞部3とからなる。   FIG. 1 is a perspective view showing a protective cap of a cutting tool according to this embodiment, and FIG. 2 is a sectional view and a side view. As can be seen from these drawings, the protective cap 1 according to the present embodiment includes a substantially cylindrical tube portion 2 that houses a cutting edge portion 6 of an end mill 5 as a cutting tool, and a blocking portion that blocks the tip of the tube portion. It consists of three.

筒部2は楕円状断面をなしており、その楕円状断面における短軸の延長線上には、筒部2の材軸と平行に延びる突条4a,4aを筒部2の内面に対向配置してある。同様に、長軸の延長線上には、筒部の材軸と平行に延びる突条4b,4bを対向配置してある。突条4bはそれぞれ1本の突条で構成してあるとともに、突条4aはそれぞれ2本の突条で構成してあり、計6本の突条が筒部2の内面に形成してある。   The cylindrical portion 2 has an elliptical cross section, and protrusions 4a and 4a extending in parallel with the material axis of the cylindrical portion 2 are disposed opposite to the inner surface of the cylindrical portion 2 on the extension of the short axis in the elliptical cross section. It is. Similarly, on the extended line of the long axis, ridges 4b, 4b extending in parallel with the material axis of the cylindrical portion are arranged to face each other. Each of the protrusions 4b is composed of one protrusion, and each of the protrusions 4a is composed of two protrusions, and a total of six protrusions are formed on the inner surface of the cylindrical portion 2. .

筒部及び閉塞部3は、弾性材料としての軟質塩化ビニル樹脂等の合成樹脂で一体形成してあり、閉塞部3は、エンドミル5が筒部2を貫通して該筒部の先端から露出するのを防止する役割を果たす。なお、突条4aや突条4bについても、筒部及び閉塞部3と一体形成するのが望ましい。突条4a及び突条4bは、例えば半円断面状に形成することができる。   The cylindrical portion and the closing portion 3 are integrally formed of a synthetic resin such as a soft vinyl chloride resin as an elastic material, and the closing portion 3 is exposed from the tip of the cylindrical portion through the end mill 5 passing through the cylindrical portion 2. It plays a role to prevent In addition, it is desirable that the protrusion 4a and the protrusion 4b are also formed integrally with the cylindrical portion and the closing portion 3. The protrusion 4a and the protrusion 4b can be formed in a semicircular cross-sectional shape, for example.

筒部2は上述したように楕円状断面をなすように形成してあるが、その形状及びサイズを決定するにあたっては、エンドミル5の刃径範囲を考慮する。   The cylindrical portion 2 is formed to have an elliptical cross section as described above. However, in determining its shape and size, the blade diameter range of the end mill 5 is taken into consideration.

すなわち、本実施形態に係る保護キャップ1を使用可能なエンドミル5の刃径をD1からD2の範囲とすれば、突条4a,4aの先端同士の間隔が最小径であるD1よりも若干小さくなるように(図3(a))、かつ突条4b,4bの先端同士の間隔が最大径であるD2よりも若干小さくなるように(図3(b))筒部2を形成する。 That is, if the edge diameter of the end mill 5 that can use the protective cap 1 according to the present embodiment is in the range of D 1 to D 2 , the distance between the tips of the protrusions 4a and 4a is smaller than D 1 having the minimum diameter. The cylindrical portion 2 is formed so as to be slightly smaller (FIG. 3 (a)) and so that the distance between the tips of the protrusions 4b and 4b is slightly smaller than D 2 which is the maximum diameter (FIG. 3 (b)). To do.

ここで、筒部2を弾性材料である軟質塩化ビニル樹脂で形成してあるため、弾性範囲を限度として筒部2の内径が拡張可能な状態であり、それゆえ、筒部2の内径よりも刃径が大きなエンドミル5を挿入しあるいは被せることができる。   Here, since the cylindrical portion 2 is formed of a soft polyvinyl chloride resin, which is an elastic material, the inner diameter of the cylindrical portion 2 can be expanded to the limit of the elastic range. An end mill 5 having a large blade diameter can be inserted or covered.

したがって、上述したように筒部2のサイズを設定しておけば、刃径がD1のエンドミル5を挿入しあるいは被せたとき、図3(a)に示すように、突条4a,4aが切刃部6を両側から挟み込むように切刃に当接する。また、刃径がD2のエンドミル5を挿入しあるいは被せたとき、図3(b)に示すように、突条4a,4aが切刃部6を両側から挟み込むように切刃に当接するとともに、突条4b,4bが直交方向から切刃部6を両側から挟み込むように切刃に当接する。 Therefore, by setting the size of the cylindrical portion 2 as described above, when the blade diameter is covered or insert the end mill 5 of D 1, as shown in FIG. 3 (a), protrusions 4a, 4a is The cutting blade 6 is brought into contact with the cutting blade so as to be sandwiched from both sides. Further, when the edge diameter is covered or insert the end mill 5 D 2, as shown in FIG. 3 (b), projection 4a, with 4a abuts against the cutting edge so as to sandwich the cutting blade 6 from both sides The protrusions 4b and 4b abut against the cutting blade so as to sandwich the cutting blade portion 6 from both sides in the orthogonal direction.

本実施形態に係る切削工具の保護キャップ1においては、筒部2の内面に突条4a,4a及び突条4b,4bを形成してあり、エンドミル5の切刃部6を保護キャップ1の筒部2に挿入した状態(切刃部6に保護キャップ1が被せられた状態)では、突条4a,4a及び突条4b,4bがエンドミル5の周面に形成された切刃に当接する。また、突条4a,4a及び突条4b,4bは、筒部2の材軸と平行に延びているため、螺旋状に形成された切刃とは、当接箇所が交差状態となる。   In the protective cap 1 of the cutting tool according to the present embodiment, the ridges 4 a and 4 a and the ridges 4 b and 4 b are formed on the inner surface of the cylinder portion 2, and the cutting edge portion 6 of the end mill 5 is connected to the cylinder of the protection cap 1. In the state inserted into the portion 2 (the state in which the protective cap 1 is put on the cutting edge portion 6), the protrusions 4a and 4a and the protrusions 4b and 4b come into contact with the cutting edge formed on the peripheral surface of the end mill 5. Moreover, since the protrusion 4a, 4a and the protrusion 4b, 4b are extended in parallel with the material axis of the cylinder part 2, a contact location will be in an intersection state with the cutting blade formed in spiral.

したがって、エンドミル5の材軸に沿った方向に保護キャップ1をまっすぐ引き抜こうとすると、図4に示すように、エンドミル5の切刃41が突条4a,4aに食い込んで引抜き移動が阻止され、過度な引抜き力を加えない限り、保護キャップ1の引抜きが確実に防止される。   Therefore, when the protective cap 1 is pulled straight in the direction along the material axis of the end mill 5, the cutting edge 41 of the end mill 5 bites into the protrusions 4a and 4a as shown in FIG. As long as a sufficient pulling force is not applied, the protective cap 1 is reliably pulled out.

同図(b)に示した矢印は、筒部2の引抜きに応じて切刃41が突条4a,4aに食い込み、その結果、引抜き方向と逆方向の反力P1が生じる様子を示したものであり、かかる反力が引抜き力P2と釣り合って引抜き移動が阻止される。 Arrows shown in FIG. (B), the bite cutting edge 41 ridges 4a, the 4a in accordance with the withdrawal of the tubular portion 2, as a result, shows how the reaction force P 1 of the pull-out direction opposite occurs are those, withdrawal movement is prevented balanced according reaction force and withdrawal force P 2.

一方、切刃41は右ねじれ(右螺旋刃)であるため、図5で言えば、切刃41の右側に刃先が形成されている。   On the other hand, since the cutting edge 41 is a right twist (right spiral blade), the cutting edge is formed on the right side of the cutting edge 41 in FIG.

そのため、図5及び図6に示すように、保護キャップ1を切刃41のねじれ方向と同一の方向に回転させながら引抜き力を加えると、切刃41の刃先に逆らわない回転方向であるため、切刃41は突条4aに食い込まず、保護キャップ1をスムーズにエンドミル5から取り外すことができる。なお、エンドミル5の刃径がD2である場合、突条4bについも全く同様のことが言える。 Therefore, as shown in FIG. 5 and FIG. 6, when a pulling force is applied while rotating the protective cap 1 in the same direction as the twisting direction of the cutting edge 41, the rotation direction does not oppose the cutting edge of the cutting edge 41. The cutting edge 41 does not bite into the protrusion 4a, and the protective cap 1 can be smoothly removed from the end mill 5. In the case edge diameter of the end mill 5 is D 2, with the protrusion 4b also can be said exactly the same.

このように、本実施形態に係る保護キャップ1は、引抜き操作の際、切刃41のねじれ方向と同一方向の回転操作を加えることで、切刃41が突条4aや突条4bに食い込まないようにすることができるため、エンドミル5に対する保護キャップ1の回転数は、最適回転数以上で任意の値を取り得る。   Thus, the protective cap 1 according to the present embodiment does not bite into the ridge 4a or the ridge 4b by applying a rotation operation in the same direction as the twisting direction of the cutting blade 41 during the pulling operation. Therefore, the rotational speed of the protective cap 1 with respect to the end mill 5 can take any value above the optimal rotational speed.

すなわち、切刃41の螺旋ピッチと同じピッチで回転させれば、保護キャップ1を最も早く取り外すことが可能であり(以下、これを最適回転数と呼ぶ)、この最適回転数よりも回転数が少なければ、引抜き動作によって切刃41が突条4aや突条4bに食い込み、引抜きが阻止される。   In other words, if the protective cap 1 is rotated at the same pitch as the spiral pitch of the cutting blade 41, the protective cap 1 can be removed earliest (hereinafter referred to as the optimum rotational speed), and the rotational speed is higher than the optimal rotational speed. If it is less, the cutting edge 41 bites into the ridges 4a and 4b by the drawing operation, and the drawing is prevented.

一方、最適回転数よりも回転数が多い場合については、突条4aあるいは突条4bに対する切刃41の動きは、突条4aや突条4bに逆らわない動きとなり、突条4aや突条4bとの当接面を相対的に滑っていくだけとなって、いわば空回り状態になり、取り外しには時間がかかるものの、引抜きは何ら阻止されない。   On the other hand, when the rotation speed is higher than the optimum rotation speed, the movement of the cutting edge 41 with respect to the protrusion 4a or the protrusion 4b does not oppose the protrusion 4a or the protrusion 4b, and the protrusion 4a or the protrusion 4b. The sliding surface is merely slipped relatively, so that it is in an idle state, and although it takes time to remove it, it does not prevent pulling out.

図6(b)に示した材軸方向の矢印は、筒部2の引抜きに応じて切刃41が突条4a,4aの当接面を滑り、その結果、わずかな動摩擦力P1′が引抜き方向と逆方向に生じる様子を示したものであり、かかる動摩擦力P1′がわずかな引抜き力P2′と釣り合いながら、引抜き移動が進行することを示すものである。 The arrow in the direction of the material axis shown in FIG. 6 (b) indicates that the cutting edge 41 slides on the contact surface of the protrusions 4a and 4a in accordance with the withdrawal of the cylindrical portion 2, and as a result, a slight dynamic friction force P 1 ′ is generated. It shows a state that occurs in the direction opposite to the drawing direction, and shows that the drawing movement proceeds while the dynamic friction force P 1 ′ is balanced with a slight drawing force P 2 ′.

また、回転に関する矢印は、筒部2の回転に応じて切刃41が突条4a,4aの当接面を滑り、その結果、わずかな動摩擦力P3′が引抜き方向と逆方向に生じる様子を示したものであり、かかる動摩擦力P3′がわずかなトルクTと釣り合いながら、回転が進行することを示すものである。 The arrow about rotation, cutting edge 41 is sliding on the contact surface of the protrusion 4a, 4a in accordance with the rotation of the cylindrical portion 2, the resulting slight dynamic friction force P 3 'is in the pull-out direction opposite state This indicates that the rotation proceeds while the dynamic friction force P 3 ′ is balanced with a slight torque T.

次に、エンドミル5を保護キャップ1に挿入し又は保護キャップ1をエンドミル5に被せるときは、切刃41の刃先方向が逆になっているため、まっすぐに挿入し又は被せても、突条4aや突条4bへの食い込みは発生せず、スムーズに挿入し又は被せることができる。   Next, when the end mill 5 is inserted into the protective cap 1 or when the protective cap 1 is put on the end mill 5, the cutting edge 41 has the cutting edge direction reversed. Biting into the ridge 4b does not occur, and it can be smoothly inserted or covered.

以上説明したように、本実施形態に係る保護キャップ1によれば、エンドミル5の材軸に沿った方向に保護キャップ1をまっすぐ引き抜こうとすると、エンドミル5の切刃41が突条4aや突条4bに食い込んで引抜き移動が阻止され、過度な引抜き力を加えない限り、保護キャップ1の引抜きが確実に防止されるとともに、エンドミル5の切刃41が右螺旋刃(右ねじれ)であるため、保護キャップ1を左(螺旋方向と同一方向)に回転させながら引抜き力を加えると、切刃41は突条4aや突条4bに食い込むことなく、スムーズにエンドミル5から取り外すことができる。   As described above, according to the protective cap 1 according to the present embodiment, when the protective cap 1 is pulled straight in the direction along the material axis of the end mill 5, the cutting edge 41 of the end mill 5 causes the ridge 4 a or the ridge. 4b, the pulling movement is prevented, and unless the excessive pulling force is applied, the protective cap 1 is reliably pulled out, and the cutting edge 41 of the end mill 5 is a right spiral blade (right twist). When a pulling force is applied while rotating the protective cap 1 to the left (the same direction as the spiral direction), the cutting edge 41 can be smoothly removed from the end mill 5 without biting into the ridges 4a and 4b.

そのため、エンドミル5が工作機械のチャック(図示せず)に固定されている場合には、まず保護キャップ1を被せ、かかる状態でチャックの固定状態を解除し、しかる後、エンドミル5を保護キャップ1の外からつかんでチャックから引き抜くことで、エンドミル5に直接手を触れることなく、切削工具の交換が可能となる。   Therefore, when the end mill 5 is fixed to a chuck (not shown) of the machine tool, the protective cap 1 is first put on, and in this state, the fixed state of the chuck is released, and then the end mill 5 is connected to the protective cap 1. The cutting tool can be replaced without directly touching the end mill 5 by grasping from the outside and pulling it out of the chuck.

また、エンドミル5を保管する際は、該エンドミルのシャンク部7(図1、図7)をつかみ、次いでその先端にある切刃部6を保護キャップ1に挿入すればよい。   When the end mill 5 is stored, the shank portion 7 (FIGS. 1 and 7) of the end mill is grasped, and then the cutting edge portion 6 at the tip thereof is inserted into the protective cap 1.

保管されたエンドミル5を工作機械のチャックに取り付ける際も同様であり、まずエンドミル5を保護キャップ1の外からつかんでチャックに差し込み、次いで、チャックをロックし、しかる後、エンドミル5の螺旋方向と同一の方向に保護キャップ1を回転させつつ引き抜けばよい。   The same applies when the stored end mill 5 is attached to the chuck of the machine tool. First, the end mill 5 is grasped from the outside of the protective cap 1 and inserted into the chuck, then the chuck is locked, and then the spiral direction of the end mill 5 is determined. The protective cap 1 may be pulled out while rotating in the same direction.

一方、上述したように単なる引抜き力が作用しただけでは、保護キャップ1がエンドミル5から抜け落ちることがないため、不測の怪我やエンドミル5の落下による損傷を未然に防止することが可能となる。   On the other hand, as described above, the protective cap 1 does not fall out of the end mill 5 only by applying a pulling force, so that it is possible to prevent unexpected injury and damage due to the end mill 5 falling.

本実施形態では特に言及しなかったが、切削工具はエンドミル5に限定されるものではなく、切刃が螺旋状に形成されたすべての切削工具に適用することが可能である。   Although not particularly mentioned in the present embodiment, the cutting tool is not limited to the end mill 5 and can be applied to all cutting tools in which the cutting edge is formed in a spiral shape.

また、本実施形態では、説明の便宜上、切刃の螺旋方向を右ねじれとしたが、左ねじれの切削工具にも本発明に係る保護キャップを適用することが可能である。なお、左ねじれの場合には、取り外す際の保護キャップの回転方向が逆になるが、その他については上述の実施形態と同様であるので、ここではその説明を省略する。   Further, in this embodiment, for convenience of explanation, the spiral direction of the cutting blade is right-handed, but the protective cap according to the present invention can be applied to a left-handed cutting tool. In the case of left-handed twist, the direction of rotation of the protective cap at the time of removal is reversed, but the rest is the same as in the above-described embodiment, and the description thereof is omitted here.

また、本実施形態では、楕円断面における長軸方向に突条4bを設けたが、引抜きに対する抵抗力を突条4aで確保できるのであれば、これを省略してもよい。同様に、2本構成とした突条4aを1本構成としてもかまわない。   Moreover, in this embodiment, although the protrusion 4b was provided in the major axis direction in the elliptical cross section, if the resistance to drawing-out can be ensured by the protrusion 4a, this may be omitted. Similarly, the two protrusions 4a may be configured as one.

また、本実施形態では、一定範囲の刃径に対応すべく、楕円断面をなすように筒部を形成したが、必ずしも楕円断面に形成する必要はなく、刃径ごとでよいのであれば、円形断面でもかまわない。   Further, in this embodiment, the cylindrical portion is formed so as to have an elliptical cross section so as to correspond to a certain range of blade diameters. However, it is not always necessary to form the elliptical cross section. A cross section is also acceptable.

また、本実施形態では、保護キャップ1を取り外す方法として、引抜き動作に回転動作を加えることを前提としたが、これはボルトナット構造を念頭に置くことによる理解の便宜のためであり、本発明の場合、螺旋ピッチがボルトナットよりもずっと大きい切削工具を対象としており、回転動作をあえて加える必要がない場合があり、これを図7に示す。   Further, in the present embodiment, as a method of removing the protective cap 1, it is assumed that a rotation operation is added to the pulling-out operation, but this is for the convenience of understanding by keeping the bolt-nut structure in mind. In this case, a cutting tool whose helical pitch is much larger than that of the bolt and nut is targeted, and there is a case where it is not necessary to add a rotational operation. This is shown in FIG.

同図(a)及び(b)に示すように、保護キャップ1の筒部2に引抜き力Pが作用したとき、切刃41の刃先には、該刃先に直交する方向に反力Nが発生し、この反力Nのうち、引抜き力Pと同一作用線への分力P′が引抜き力Pと釣り合う。そして、これに直交する方向の分力Tは、保護キャップ1を回転させる力として刃先41から保護キャップ1に作用するが、かかる分力Tについては、摩擦力Fよりも大きくない限り、保護キャップ1が自然に回転することはない。   As shown in FIGS. 2A and 2B, when a pulling force P acts on the cylindrical portion 2 of the protective cap 1, a reaction force N is generated in the cutting edge of the cutting edge 41 in a direction perpendicular to the cutting edge. Of the reaction force N, the component force P ′ to the same line of action as the pulling force P is balanced with the pulling force P. The component force T in the direction orthogonal to this acts on the protection cap 1 from the blade edge 41 as a force for rotating the protection cap 1, and the component force T is not greater than the frictional force F unless it is greater than the friction force F. 1 does not rotate naturally.

例えばボルトやナットの場合、ネジ山のピッチが小さいため、同図(c)のように、分力Tよりも摩擦力Fの方がはるかに大きくなり、ナットが自然には回ることはない。   For example, in the case of bolts and nuts, since the thread pitch is small, the frictional force F is much larger than the component force T as shown in FIG.

一方、螺旋刃のピッチが大きい切削工具の場合、同図(d)に示すように、回転方向の分力Tは、摩擦力Fよりも大きくなる場合があり、この場合には、引抜き動作を行うだけで自然に回転する。   On the other hand, in the case of a cutting tool having a large pitch between the spiral blades, the component force T in the rotational direction may be greater than the frictional force F as shown in FIG. Rotate naturally just by doing.

したがって、本発明に係る保護キャップの使用方法としては、回転動作を必須とするものではないと言える。なお、これは、保護キャップが自然に脱落する可能性があることを意味するものではなく、保護キャップの自重が引張力となって上述したような回転動作が自然に生じないよう、保護キャップの形成材料を適宜選択すればよく、例えば公知の合成樹脂で保護キャップを形成する限り、保護キャップが自重で自然に回転し、抜け落ちるといった事態は生じない。   Therefore, it can be said that a rotation operation is not essential as a method of using the protective cap according to the present invention. Note that this does not mean that the protective cap may fall off naturally, and the protective cap's own weight will be a tensile force to prevent the above-mentioned rotational movement from occurring naturally. The forming material may be selected as appropriate. For example, as long as the protective cap is formed of a known synthetic resin, the protective cap does not rotate by its own weight and falls off.

本実施形態に係る切削工具の保護キャップの斜視図。The perspective view of the protective cap of the cutting tool which concerns on this embodiment. 同じく保護キャップの図であり、(a)は断面図、(b)はA−A線方向から見た矢視図、(c)はB−B線方向から見た矢視図。It is a figure of a protective cap similarly, (a) is sectional drawing, (b) is an arrow view seen from the AA line direction, (c) is an arrow view seen from the BB line direction. 切削工具の刃径に応じて断面形状が変化する様子を示した図。The figure which showed a mode that a cross-sectional shape changed according to the blade diameter of a cutting tool. 保護キャップを引き抜いたときの様子を示した図であり、(a)は側面図、(b)は詳細図。It is the figure which showed the mode when a protective cap was pulled out, (a) is a side view, (b) is a detailed figure. 引抜き時に回転操作を加えたときの斜視図。The perspective view when rotating operation is added at the time of extraction. 同じく引抜き時に回転操作を加えたときの図であり、(a)は側面図、(b)は詳細図。Similarly, it is a figure when rotating operation is added at the time of extraction, (a) is a side view, (b) is a detailed view. 保護キャップの別の使用方法を説明した図。The figure explaining another usage method of a protective cap.

符号の説明Explanation of symbols

1 保護キャップ
2 筒部
3 閉塞部
4a,4b 突条
5 エンドミル(切削工具)
6 切刃部
41 切刃
DESCRIPTION OF SYMBOLS 1 Protective cap 2 Cylinder part 3 Closure part 4a, 4b Projection 5 End mill (cutting tool)
6 Cutting blade part 41 Cutting blade

Claims (3)

弾性材料で形成されたほぼ円筒状の筒部と該筒部の先端を塞ぐ閉塞部とからなるとともに、該筒部の材軸と平行に延びる突条を前記筒部の内面にかつ対向位置に設けたことを特徴とする切削工具の保護キャップ。 A substantially cylindrical tube portion made of an elastic material and a closing portion that closes the tip of the tube portion, and a ridge extending in parallel with the material axis of the tube portion on the inner surface of the tube portion and at a facing position A protective cap for a cutting tool characterized by being provided. 前記筒部を楕円状断面とし、該楕円状断面における短軸の延長線上に前記突条を配置した請求項1記載の切削工具の保護キャップ。 The protective cap for a cutting tool according to claim 1, wherein the cylindrical portion has an elliptical cross section, and the protrusions are arranged on an extension line of a short axis in the elliptical cross section. 前記楕円状断面における長軸の延長線上に前記突条を配置した請求項2記載の切削工具の保護キャップ。 The protective cap for a cutting tool according to claim 2, wherein the protrusion is disposed on an extended line of a long axis in the elliptical cross section.
JP2007270733A 2007-10-17 2007-10-17 Protective cap of cutting tool Withdrawn JP2009095943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007270733A JP2009095943A (en) 2007-10-17 2007-10-17 Protective cap of cutting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007270733A JP2009095943A (en) 2007-10-17 2007-10-17 Protective cap of cutting tool

Publications (1)

Publication Number Publication Date
JP2009095943A true JP2009095943A (en) 2009-05-07

Family

ID=40699427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007270733A Withdrawn JP2009095943A (en) 2007-10-17 2007-10-17 Protective cap of cutting tool

Country Status (1)

Country Link
JP (1) JP2009095943A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104249178A (en) * 2013-06-28 2014-12-31 江苏天工工具有限公司 Radial edge drill bit with protection sleeve
CN105729431A (en) * 2016-03-31 2016-07-06 苏州亚思科精密数控有限公司 Tool storage rack
CN114700542A (en) * 2022-04-12 2022-07-05 大连交通大学 Internal suction type milling cutter for efficient processing of composite materials

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104249178A (en) * 2013-06-28 2014-12-31 江苏天工工具有限公司 Radial edge drill bit with protection sleeve
CN104249178B (en) * 2013-06-28 2016-06-08 江苏天工工具有限公司 A kind of radial edge drill bit with sheath
CN105729431A (en) * 2016-03-31 2016-07-06 苏州亚思科精密数控有限公司 Tool storage rack
CN114700542A (en) * 2022-04-12 2022-07-05 大连交通大学 Internal suction type milling cutter for efficient processing of composite materials

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