JP5009537B2 - Cutting tools - Google Patents
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- JP5009537B2 JP5009537B2 JP2006022682A JP2006022682A JP5009537B2 JP 5009537 B2 JP5009537 B2 JP 5009537B2 JP 2006022682 A JP2006022682 A JP 2006022682A JP 2006022682 A JP2006022682 A JP 2006022682A JP 5009537 B2 JP5009537 B2 JP 5009537B2
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Description
本発明は、エンドミル、ドリル、タップ、リーマ等の切削工具の改良に関するものである。 The present invention relates to improvements in cutting tools such as end mills, drills, taps, and reamers.
従来の切削工具は、その先端の刃物部から後端のシャンク部に至るまで、全体が同一の材料で一体に形成されているもの、或いは刃物部を有するシャンク部と焼き嵌めチャック部を別体構造にしたものがある。
例えば、図１に示すように、先端側に嵌入孔２を有する本体シャンク部材１（以下、焼き嵌めチャック部材という）と、この焼き嵌めチャック部材１と線膨張係数の異なる材料からなる先端部に刃物部４を有する刃物シャンク部３を備えた刃物部材５からなり、焼き嵌めチャック部材１先端側の嵌入孔２に前記刃物シャンク部３の後端部を焼き嵌めされるようにしたものにおいて、図２に示すように、前記刃物シャンク部３の外径より焼き嵌めチャック部材１の外径を小さくして、焼き嵌め時に前記刃物シャンク部３の外径と焼き嵌めチャック部材１の先端外径をほぼ同等とするようにし、刃物部材５と焼き嵌めチャック部材１とを別材料にして経済性を保ちながら刃物部材に結合される焼き嵌めチャック部又は連結部材を加工物と干渉しにくい形状にして狭所での切削加工を出来るようにしたものが特開２０００−１２６９１８号公報に開示されている。
The conventional cutting tool is formed integrally with the same material from the blade part at the front end to the shank part at the rear end, or the shank part having the blade part and the shrink fit chuck part are separated. There is a structure.
For example, as shown in FIG. 1, a main body shank member 1 (hereinafter referred to as shrink fit chuck member) having a fitting hole 2 on the distal end side, and a tip portion made of a material having a linear expansion coefficient different from that of the shrink fit chuck member 1 are provided. It consists of a blade member 5 provided with a blade shank portion 3 having a blade portion 4, and the rear end portion of the blade shank portion 3 is shrink-fitted into the insertion hole 2 on the tip side of the shrink-fitting chuck member 1. As shown in FIG. 2, the outer diameter of the shrink-fitting chuck member 1 is made smaller than the outer diameter of the blade shank part 3, and the outer diameter of the blade shank part 3 and the outer diameter of the tip of the shrink-fitting chuck member 1 during shrink fitting. Are made substantially the same, and the shrink-fitting chuck portion or connecting member coupled to the blade member is made to interfere with the workpiece while maintaining the economy by making the blade member 5 and the shrink-fitting chuck member 1 different materials. That to be able to cutting in the stomach shape to narrow place is disclosed in JP-A-2000-126918.
従来の刃物部材５は、超硬度鋼や高速度鋼等の硬質刃具材からなり、円柱状の刃物シャンク部３と刃物部４とを一体に形成しており、その外径が軸方向にわたって略均一なストレート状に形成されている。そして、焼き嵌めチャック部材１は、刃物部材５よりも線膨張係数の高い材料で形成され、その先端側には開口する嵌入孔２が設けられている。そして、この嵌入孔２内に上記刃物シャンク部４が焼きばめされるように、刃物シャンク部３の外径及び嵌入孔２の内径が設定されている。
前述した構造における切削工具では、焼き嵌めチャック部材１の嵌入孔２内に前記切削工具の刃物シャンク部４を焼き嵌めする場合には、刃物部材５全体が外径の均一なストレート状となっているので、焼き嵌めチャック部材１の嵌入孔２は温度を高くして、例えば直径で少なくとも０．０２ｍｍ以上嵌入孔２を大きくして焼き嵌めしなければならない。しかるに、温度を高くして嵌入孔の直径寸法を０．０２ｍｍ程度大きくし、前記刃物シャンク部４の後端部には多少の面取りが施されているにもかかわらず、焼き嵌め挿入時に刃物シャンク部４の後端部がスムーズに挿入されず、後端部をこじてしまう恐れがある。
したがって、刃物シャンク部４の後端部がスムーズに挿入されるためには、前記嵌入孔２の開口径を大きくする必要があり、更に温度を上げて開口径を広げる必要があった。通常焼き嵌めされる焼き嵌めチャック部材１の焼き嵌め温度は、３００°Ｃ程であるが、上記のように刃物シャンク部４後端部にこじるなどの不具合が生じた場合は、焼き嵌め温度を５００℃以上にして前記嵌入孔２の開口径を大きくしなければならず、焼き嵌めチャック部材１自体が、熱で酸化され耐久性が劣化するとか、加工時の振れ精度が期待できないなどの不具合があった。
In the cutting tool having the above-described structure, when the blade shank portion 4 of the cutting tool is shrink-fitted in the insertion hole 2 of the shrink-fitting chuck member 1, the entire blade member 5 has a straight shape with a uniform outer diameter. Therefore, the temperature of the insertion hole 2 of the shrink-fitting chuck member 1 must be increased by increasing the temperature, for example, by increasing the diameter of the insertion hole 2 by at least 0.02 mm or more. However, the diameter of the insertion hole is increased by about 0.02 mm by raising the temperature, and the blade shank is inserted into the blade shank portion 4 at the time of shrink fitting even though the rear end portion thereof is chamfered. The rear end portion of the portion 4 is not smoothly inserted, and the rear end portion may be twisted.
Therefore, in order to smoothly insert the rear end portion of the blade shank portion 4, it is necessary to increase the opening diameter of the fitting hole 2, and it is necessary to further increase the temperature to increase the opening diameter. The shrink-fitting temperature of the shrink-fitting chuck member 1 that is normally shrink-fitted is about 300 ° C. However, if a problem such as a squeezing at the rear end of the blade shank 4 occurs as described above, the shrink-fitting temperature is set. The opening diameter of the insertion hole 2 must be increased to 500 ° C. or higher, and the shrink-fitting chuck member 1 itself is oxidized by heat to deteriorate durability, or the deflection accuracy during processing cannot be expected. was there.
本発明は、このような事情に鑑み、焼き嵌めチャック部材の嵌入孔に挿入される刃物シャンク部の後端部に、前記嵌入孔の径より僅かに小さい細径とした挿入ガイド部を設け、焼き嵌めする以前に前記焼き嵌めチャック部材の嵌入孔に刃物シャンク部の細径部分を挿入しておいてから、焼き嵌め結合を行うようにし、刃物シャンク部の後端部に生じるこじなどを防止し且つ焼き嵌め作業が容易に行えるようにした切削工具を提供することを目的とする。 In view of such circumstances, the present invention provides an insertion guide portion having a small diameter slightly smaller than the diameter of the insertion hole at the rear end portion of the blade shank portion to be inserted into the insertion hole of the shrink fitting chuck member. Prior to shrink fitting, the small diameter portion of the blade shank is inserted into the insertion hole of the shrink fit chuck member, and then shrink fitting is performed to prevent the edge of the blade shank from being curled. In addition, an object of the present invention is to provide a cutting tool capable of easily performing shrink fitting work.
上記目的を達成するために請求項１の発明は、焼き嵌めチャック部材の先端部に形成されたストレート状の嵌入孔に切削工具のストレート状の刃物シャンク部を焼き嵌めによって結合するようにしたエンドミル、ドリル、タップ、リーマ等の切削工具において、
前記刃物シャンク部は、該刃物シャンク部の後端から離間する方向に前記刃物シャンク部と同心に突設された円柱状の挿入ガイド部を有し、
前記挿入ガイド部は、加熱前の前記焼き嵌めチャック部材の嵌入孔に挿入可能で前記刃物シャンク部の直径より０．０２〜０．０４ｍｍ小さい直径と、前記刃物シャンク部の直径×０．５ｍｍに相当する長さを有し、
さらに、前記刃物シャンク部の後端に、該刃物シャンク部の直径寸法と前記挿入ガイド部の直径寸法との差である前記０．０２〜０．０４ｍｍに相当する段部が形成されており、
前記刃物シャンク部を前記焼き嵌めチャック部材に焼き嵌めするに際しては、前記段部が前記焼き嵌めチャック部材の嵌入孔の端面に接するまで前記挿入ガイド部を前記嵌入孔に挿入して前記刃物シャンク部を前記焼き嵌めチャック部材に仮り止めする、
ことを特徴とする。
In order to achieve the above object, an invention according to claim 1 is directed to an end mill in which a straight blade shank portion of a cutting tool is coupled to a straight insertion hole formed at a tip portion of a shrink fitting chuck member by shrink fitting. In cutting tools such as drills, taps and reamers,
The blade shank part has a columnar insertion guide part that protrudes concentrically with the blade shank part in a direction away from the rear end of the blade shank part,
The insertion guide portion can be inserted into the insertion hole of the shrink-fitting chuck member before heating and has a diameter 0.02 to 0.04 mm smaller than the diameter of the blade shank portion and a diameter of the blade shank portion x 0.5 mm. Has a corresponding length,
Furthermore, a step portion corresponding to 0.02 to 0.04 mm, which is a difference between the diameter dimension of the blade shank part and the diameter dimension of the insertion guide part, is formed at the rear end of the blade shank part,
Wherein when the tool shank is shrink-fitted to the baked fit chuck member, the insertion guide portion inserted in the tool shank in the insertion hole of the before Kidan portion is in contact with the end surface of the fitting hole of the baked fit chuck member A part is temporarily fixed to the shrink-fitting chuck member ,
It is characterized by that.
請求項２の発明は、請求項１記載の切削工具において、前記焼き嵌めチャック部材の材質より硬質の超硬度鋼や高速度鋼等の硬質刃具材から形成されたものであることを特徴とする。 According to a second aspect of the present invention, in the cutting tool according to the first aspect, the cutting tool is formed from a hard cutting tool material such as super hard steel or high speed steel which is harder than the material of the shrink-fit chuck member. .
請求項３の発明は、請求項１記載の切削工具において、前記切削工具は前記焼き嵌めチャック部材と同材質で形成されたものであることを特徴とする。 According to a third aspect of the present invention, in the cutting tool according to the first aspect, the cutting tool is formed of the same material as the shrink-fitting chuck member.
本発明の切削工具によれば、焼き嵌めチャック部材の嵌入孔内に前記刃物シャンク部を焼き嵌めする場合に、予め前記刃物シャンク部の後端部に前記嵌入孔の径より僅かに小さい細径とした挿入ガイド部を挿入してから焼き嵌めするようにしたので、焼き嵌め結合時に刃物シャンク部の後端部に生じるこじなどを防止し且つ焼き嵌め作業が容易に行えるようにし、焼き嵌めされる焼き嵌めチャック部材自体の加熱におる酸化耐久性の劣化の防止や加工時の振れ精度を良好にする効果がある。 According to the cutting tool of the present invention, when the blade shank portion is shrink-fitted into the insertion hole of the shrink-fitting chuck member, a small diameter slightly smaller than the diameter of the insertion hole in advance at the rear end portion of the blade shank portion. Since the insertion guide section is inserted and then shrink-fitted, it is possible to prevent fraying at the rear end of the blade shank when joining by shrink-fitting and to facilitate the shrink-fitting operation. This has the effect of preventing deterioration in oxidation durability during heating of the shrink-fitting chuck member itself and improving the deflection accuracy during processing.
以下、本発明の実施の形態について、切削工具が、刃物シャンク部の先端部に刃物部を有し、全体外径の均一なストレート状をなしているリーマについて図面を参照して説明する。 DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings with respect to a reamer in which a cutting tool has a blade portion at the tip of a blade shank portion and has a straight shape with a uniform overall outer diameter.
図３は本発明にかかる切削工具の一実施例を示すリーマ切削工具の側面図であり、図４はリーマ切削工具の後端部の挿入ガイド部を焼き嵌めする以前に、焼き嵌めチャック部材の嵌入孔内に挿入した状態を示す要部側断面図で、図５は切削工具の刃物シャンク部を、焼き嵌めチャック部材の嵌入孔内に挿入した使用状態を示す要部側断面図である。 FIG. 3 is a side view of a reamer cutting tool showing an embodiment of the cutting tool according to the present invention. FIG. 4 is a side view of the shrink-fitting chuck member before shrink-fitting the insertion guide portion at the rear end of the reamer cutting tool. FIG. 5 is a cross-sectional side view of the main part showing a state in which the cutting tool shank portion of the cutting tool is inserted into the insertion hole of the shrink-fitting chuck member.
図１において、１０は深堀加工などに使用されるリーマ切削工具で、超硬度鋼や高速度鋼等の硬質刃具材から形成され、刃物シャンク部１１の先端に刃物部１２を有する全体外径の均一なストレート状をなしている。
前記切削工具１０は、前記刃物シャンク部１１の後端部に、該刃物シャンク部１１の直径寸法よりも僅かに細径の挿入ガイド部１３を形成したもので、前記挿入ガイド部１３の直径寸法は、前記刃物シャンク部１１の直径寸法よりも０.０２〜０.０４ｍｍ細く、軸方向の長さがおよそ刃物シャンク部１１の直径×０.５ｍｍとしたものである。
In FIG. 1, reference numeral 10 denotes a reamer cutting tool used for deep drilling or the like, which is formed of a hard cutting tool material such as super hard steel or high speed steel, and has an overall outer diameter having a blade portion 12 at the tip of a blade shank portion 11. It has a uniform straight shape.
The cutting tool 10 is formed by forming an insertion guide portion 13 slightly smaller in diameter than the diameter dimension of the blade shank portion 11 at the rear end portion of the blade shank portion 11, and the diameter dimension of the insertion guide portion 13. Is 0.02 to 0.04 mm thinner than the diameter dimension of the blade shank part 11, and the axial length is approximately the diameter of the blade shank part x 0.5 mm.
また、１４は前記切削工具と同材質或いは切削工具より柔らかな材質で形成された焼き嵌めチャック部材で、先端部に前記刃物シャンク部１１の後端部を焼き嵌め嵌入する嵌入孔１５が形成されている。 Reference numeral 14 denotes a shrink-fitting chuck member made of the same material as that of the cutting tool or a softer material than the cutting tool. ing.
以上のように形成された焼き嵌めチャック部材１４と、前記切削工具を焼き嵌めするには、従来では、図示しないツール焼き嵌め装置のベース上に、回転自在な焼き嵌めチャック部材１４を保持する保持部材と、前記焼き嵌めチャック部材１４の先端部を加熱する加熱手段とを備え、前記焼き嵌めチャック部材１４を回転しながらほぼ３００℃位に加熱して、前記焼き嵌めチャック部材１４の嵌入孔１５の直径寸法を０.０２ｍｍ程度大きくして切削工具の刃物シャンク部１１の後端軸部を挿入して焼き嵌めするようにしているが、本発明では前記焼き嵌めチャック部材１４の先端部の加熱以前に、回転自在な保持部材に焼き嵌めチャック部材１４の後端部を保持し、この焼き嵌めチャック部材１４の嵌入孔１５に切削工具の細径部分の挿入ガイド１３を挿入して、焼き嵌めチャック部材１４と切削工具の刃物シャンク部１１を仮り止め連結し、この状態で前記焼き嵌めチャック部材１４を回転しながらほぼ３００℃位に加熱して、前記焼き嵌めチャック部材１４の嵌入孔１５の直径寸法を０.０２ｍｍ程度膨張させて大きくし、前記嵌入孔１５の直径寸法が大きくなったところで、切削工具の刃物シャンク部１１の後端軸部を、押し込み挿入して焼き嵌めチャック部材１４の嵌入孔１５に焼き嵌めする。 In order to shrink-fit the shrink-fitting chuck member 14 formed as described above and the cutting tool, conventionally, a holder for holding the rotatable shrink-fitting chuck member 14 on a base of a tool shrink-fitting device (not shown) is provided. And a heating means for heating the tip of the shrink-fitting chuck member 14 and heating the shrink-fitting chuck member 14 to about 300 ° C. while rotating, so that the insertion hole 15 of the shrink-fitting chuck member 14 is provided. Is increased by about 0.02 mm, and the rear end shaft portion of the cutter shank portion 11 of the cutting tool is inserted and shrink-fitted. In the present invention, the tip end portion of the shrink-fitting chuck member 14 is heated. Previously, the rear end portion of the shrink-fitting chuck member 14 is held by a rotatable holding member, and the insertion tool 15 for inserting the small-diameter portion of the cutting tool into the insertion hole 15 of the shrink-fitting chuck member 14. The insert 13 is inserted, and the shrink-fitting chuck member 14 and the cutting tool shank 11 of the cutting tool are temporarily fixedly connected, and in this state, the shrink-fitting chuck member 14 is heated to about 300 ° C. while rotating, The diameter dimension of the fitting hole 15 of the fitting chuck member 14 is expanded by about 0.02 mm, and when the diameter dimension of the fitting hole 15 becomes large, the rear end shaft portion of the cutter shank portion 11 of the cutting tool is pushed in. Insert and shrink fit into the fit hole 15 of the shrink fit chuck member 14.
前述の実施例では、切削工具が、刃物シャンク部の先端部に刃物部を有し、全体外径の均一なストレート棒状をなしているリーマについて説明したが、刃物部と刃物シャンク部の径寸法の異なるようなエンドミル、ドリル、タップなどについても適用できることは勿論である。
また、焼き嵌めチャック部材と切削工具の材質の異なるもの、或いは同材質で形成されたものについても適用できる。
In the above-described embodiment, the cutting tool has the blade part at the tip of the blade shank part, and the reamer having a straight rod shape with a uniform outer diameter has been described, but the diameter dimensions of the blade part and the blade shank part are described. Needless to say, the present invention can also be applied to end mills, drills, taps, and the like of different types.
Further, the shrink-fitting chuck member and the cutting tool having different materials or those formed of the same material can be applied.
１０ 切削工具
１１ 刃物シャンク部
１２ 刃物部
１３ 挿入ガイド部
１４ 焼き嵌めチャック部
１５ 嵌入孔
DESCRIPTION OF SYMBOLS 10 Cutting tool 11 Cutting tool shank part 12 Cutting tool part 13 Insertion guide part 14 Shrink fitting chuck part 15 Insertion hole
Claims (3)
前記刃物シャンク部は、該刃物シャンク部の後端から離間する方向に前記刃物シャンク部と同心に突設された円柱状の挿入ガイド部を有し、
前記挿入ガイド部は、加熱前の前記焼き嵌めチャック部材の嵌入孔に挿入可能で前記刃物シャンク部の直径より０．０２〜０．０４ｍｍ小さい直径と、前記刃物シャンク部の直径×０．５ｍｍに相当する長さを有し、
さらに、前記刃物シャンク部の後端に、該刃物シャンク部の直径寸法と前記挿入ガイド部の直径寸法との差である前記０．０２〜０．０４ｍｍに相当する段部が形成されており、
前記刃物シャンク部を前記焼き嵌めチャック部材に焼き嵌めするに際しては、前記段部が前記焼き嵌めチャック部材の嵌入孔の端面に接するまで前記挿入ガイド部を前記嵌入孔に挿入して前記刃物シャンク部を前記焼き嵌めチャック部材に仮り止めする、
ことを特徴とする切削工具。 In a cutting tool such as an end mill, a drill, a tap, a reamer, etc., in which a straight blade shank portion of a cutting tool is coupled by shrink fitting to a straight insertion hole formed at the tip of the shrink fitting chuck member.
The blade shank part has a columnar insertion guide part that protrudes concentrically with the blade shank part in a direction away from the rear end of the blade shank part,
The insertion guide portion can be inserted into the insertion hole of the shrink-fitting chuck member before heating and has a diameter 0.02 to 0.04 mm smaller than the diameter of the blade shank portion and a diameter of the blade shank portion x 0.5 mm. Has a corresponding length,
Furthermore, a step portion corresponding to 0.02 to 0.04 mm, which is a difference between the diameter dimension of the blade shank part and the diameter dimension of the insertion guide part, is formed at the rear end of the blade shank part,
Wherein when the tool shank is shrink-fitted to the baked fit chuck member, the insertion guide portion inserted in the tool shank in the insertion hole of the before Kidan portion is in contact with the end surface of the fitting hole of the baked fit chuck member A part is temporarily fixed to the shrink-fitting chuck member ,
A cutting tool characterized by that.
The cutting tool according to claim 1, wherein the cutting tool is made of the same material as the shrink-fitting chuck member.
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| JP2006022682A JP5009537B2 (en) | 2006-01-31 | 2006-01-31 | Cutting tools |
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| JP2006022682A JP5009537B2 (en) | 2006-01-31 | 2006-01-31 | Cutting tools |
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| JP2000094208A (en) * | 1998-09-22 | 2000-04-04 | Mitsubishi Materials Corp | Cutting tool and manufacture thereof |
| DE10309015A1 (en) * | 2003-03-01 | 2004-09-16 | Wagner-Werkzeugsysteme Müller GmbH | Tool shrink Recording |
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2006
- 2006-01-31 JP JP2006022682A patent/JP5009537B2/en not_active Expired - Lifetime
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| JP2007203391A (en) | 2007-08-16 |
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