JP3883009B2 - End mill for high feed cutting - Google Patents
End mill for high feed cutting Download PDFInfo
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- JP3883009B2 JP3883009B2 JP2003285542A JP2003285542A JP3883009B2 JP 3883009 B2 JP3883009 B2 JP 3883009B2 JP 2003285542 A JP2003285542 A JP 2003285542A JP 2003285542 A JP2003285542 A JP 2003285542A JP 3883009 B2 JP3883009 B2 JP 3883009B2
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- end mill
- blade
- corner
- blades
- cutting
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- 239000007787 solid Substances 0.000 claims description 5
- 229910010037 TiAlN Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Description
本願発明は、金型の３次元加工等に用いるエンドミルに関し、特に、高送り用のエンドミルに関する。 The present invention relates to an end mill used for three-dimensional machining of a mold, and more particularly to a high feed end mill.
金型の３次元加工等において、コーナー部にアールを設けたエンドミルが用いられ、刃の強度と切り屑排出性を向上させたエンドミル（例えば、特許文献１参照。）が記載されている。共振を抑制する手段として、切れ刃を不等間隔で配置する手段（例えば、特許文献２参照。）があり、切れ刃長さを短くすることによりビビリ・振動を抑制したエンドミル（例えば、特許文献３参照。）があります。 In a three-dimensional machining of a mold, an end mill having rounded corners is used, and an end mill (for example, see Patent Document 1) in which the strength of the blade and the chip discharging property are improved is described. As means for suppressing resonance, there is means for disposing cutting edges at unequal intervals (see, for example, Patent Document 2), and an end mill that suppresses chatter and vibration by shortening the cutting edge length (for example, Patent Document). 3).
高能率切削に対する要望は日増しに大きくなり、高送り切削においても、送り速度を上げる要望があり、刃数を増やした時、同時切削刃が増え、切削抵抗が増加し、共振等によりビビリ・振動を生じ、切削条件を下げても、ビビリ・振動抑制効果は少ない。 The demand for high-efficiency cutting increases day by day, and even in high-feed cutting, there is a request to increase the feed rate.When the number of blades is increased, simultaneous cutting blades increase, cutting resistance increases, Even if vibration is generated and cutting conditions are lowered, there is little chatter and vibration suppression effect.
本発明は、複数のコーナ刃を有する超硬合金製ソリッドエンドミルにおいて、該コーナ刃は、該エンドミルの回転軌跡をなす主コーナ刃と該回転軌跡より減寸する副コーナ刃とからなり、該主コーナ刃は円弧状、該副コーナ刃は、該主コーナ刃と同一又は小さな円弧状で、且つ、該回転軌跡を成す刃径より０．５％〜１０％減寸し、該副コーナ刃の底刃は、該主コーナ刃の底刃と略同一としたことを特徴とする高送り切削用エンドミルです。 The present invention relates to a solid end mill made of cemented carbide having a plurality of corner blades, wherein the corner blade includes a main corner blade that forms a rotation locus of the end mill and a sub-corner blade that is reduced in size from the rotation locus. The corner blade has an arc shape, the sub-corner blade has an arc shape that is the same as or smaller than the main corner blade , and is reduced by 0.5% to 10% from the blade diameter forming the rotation locus . The bottom edge is an end mill for high-feed cutting, characterized by being almost the same as the bottom edge of the main corner edge .
本発明を適用することにより、１刃送り量を極端に大きくした高送り切削に用いるエンドミルおいて、刃数を増やしても、共振自体を制御しつつ、切削負荷を大きく変動させることにより、ビビリ・振動を抑制し、加工能率及び工具寿命の向上させたエンドミルを提供できた。 By applying the present invention, in an end mill used for high feed cutting with an extremely large one-blade feed amount, even if the number of blades is increased, the cutting load is greatly varied while controlling the resonance itself.・ We were able to provide an end mill that suppressed vibration and improved machining efficiency and tool life.
本発明では、コーナ刃を、主コーナ刃と副コーナ刃とから構成する。
主コーナ刃は、エンドミルの刃径に応じた回転軌跡を形成する刃であり、通常のエンドミルと同じです。
副コーナ刃は、主コーナ刃より小さな円弧状で、且つ、該回転軌跡を成す刃径より０．５％〜１０％減寸する。副コーナ刃は、エンドミルの回転軌跡を形成せず、切削負荷を軽減するが、切削抵抗を考慮すると、切削負荷を変動させるも、切削抵抗自体のベクトルは一定とするため主コーナ刃と同一又は小さな円弧状とした。尚、同一の円弧状は、底刃との交点を、外周刃との交点を減寸した量、エンドミル軸心側に移動させて設け、小さな円弧状は、円弧そのものを小さくし外周刃との交点を上記寸法減寸しても、底刃との交点を主コーナ刃と同じ位置に設け外周刃との交点を上記寸法減寸するため、やや楕円状をなす円弧としても良い。
減寸量は、エンドミル刃径の０．５％未満では、切削負荷の変動量が少なく、１０％を越えると、切削にほとんど関与しなくなり、切削負荷が軽減されすぎるため０．５〜１０％の範囲とした。好ましくは、１％〜５％の範囲です。
主コーナ刃の配置は、偶数刃では１回転当り、１刃又は２刃で良く、例えば４枚刃では、主コーナ刃と副コーナ刃とをエンドミル回転方向に交互に設け、６枚刃では、１刃毎、２刃毎に配置しても良い。奇数刃では、１回転当り１刃又は２刃で良い。
副コーナ刃の配置は、１〜３刃続きでよく、例えば、６枚刃では、１刃又は２刃続きで配置する。副コーナ刃の配置を２刃続きで行う場合には、その減寸量を同じとしても、変化させても良い。以下、実施例に基づき、詳細に説明する。
In the present invention, the corner blade is composed of a main corner blade and a sub-corner blade.
The main corner blade is a blade that forms a rotation trajectory according to the diameter of the end mill and is the same as a normal end mill.
The sub-corner blade has an arc shape smaller than that of the main corner blade and is reduced by 0.5% to 10% from the blade diameter forming the rotation locus. The secondary corner blade does not form the end mill rotation trajectory and reduces the cutting load, but considering the cutting force, the cutting force itself is the same as the main corner blade because the cutting force itself is constant, although the cutting load varies. Small arc shape. The same arc shape is provided by moving the intersection point with the bottom blade to the end mill shaft center side by the reduced amount of the intersection point with the outer peripheral blade. Even if the size of the intersection is reduced, the intersection with the bottom blade is provided at the same position as the main corner blade, and the size of the intersection with the outer peripheral blade is reduced.
The amount of reduction is less than 0.5% of the end mill blade diameter, and the fluctuation amount of the cutting load is small. If it exceeds 10%, the cutting load is hardly involved, and the cutting load is excessively reduced. It was made the range. Preferably, it is in the range of 1% to 5%.
The arrangement of the main corner blades may be one blade or two blades per revolution for even number blades. For example, in the case of four blades, the main corner blades and the sub-corner blades are alternately provided in the end mill rotation direction. You may arrange | position for every 1 blade and every 2 blades. With an odd number of blades, one blade or two blades per rotation may be used.
The sub-corner blades may be arranged in the range of 1 to 3 blades. For example, in the case of 6 blades, the blades are arranged with 1 blade or 2 blades. When the sub-corner blades are arranged with two blades in succession, the reduction amount may be the same or may be changed. Hereinafter, it demonstrates in detail based on an Example.
本発明例１は、ＴｉＡｌＮ被膜をコーティングした超微粒子超硬合金ソリッド製、刃径１０ｍｍ、８枚刃のエンドミルであり、エンドミル軸心に対して対向する位置に２対の主コーナ刃と２対の副コーナ刃とを回転方向に交互に設け、主コーナ刃は回転軌跡と重複し、副コーナ刃は、減寸量が各々刃径の４％で設けている。本発明例２は同仕様で、エンドミル軸心に対して対向する位置に１対の主コーナ刃と３対の副コーナ刃を回転方向に交互に設け、主コーナ刃は回転軌跡と重複し、副コーナ刃は減寸量が各々刃径の４、３、２％で設けている。
（実施例１）
Example 1 of the present invention is an ultra-fine cemented carbide solid coated with a TiAlN coating, an end mill having a blade diameter of 10 mm and 8 blades, and two pairs of main corner blades and two pairs at positions opposed to the end mill axis. The secondary corner blades are alternately provided in the rotational direction, the primary corner blade overlaps the rotation locus, and the secondary corner blades are provided with a reduction amount of 4% of the blade diameter. Example 2 of the present invention has the same specifications, and a pair of main corner blades and three pairs of sub-corner blades are alternately provided in a rotational direction at positions facing the end mill axis, and the main corner blades overlap with the rotation locus. Sub-corner blades are provided with reduction amounts of 4, 3, and 2% of the blade diameter, respectively.
Example 1
本発明例２は、ＴｉＡｌＮ被膜をコーティングした超微粒子超硬合金ソリッド製、刃径１０ｍｍ、６枚刃のエンドミルであり、エンドミル軸心に対して対向する位置に１対の主コーナ刃と２対の副コーナ刃とを回転方向に交互に設け、主コーナ刃は回転軌跡と重複し、副コーナ刃は減寸量が各々刃径の５、３％で設けている。 Invention Example 2 is a 6-flute end mill made of ultrafine cemented carbide solid coated with a TiAlN coating, having a blade diameter of 10 mm, and a pair of main corner blades and 2 pairs at positions opposed to the end mill axis. The secondary corner blades are alternately provided in the rotation direction, the main corner blades overlap the rotation trajectory, and the secondary corner blades are provided with a reduction amount of 5 and 3% of the blade diameter, respectively.
本発明例３は、ＴｉＡｌＮ被膜をコーティングした超微粒子超硬合金ソリッド製、刃径１０ｍｍ、４枚刃のエンドミルであり、図１、図２に示すようにエンドミル軸心に対して対向する位置に１対の主コーナ刃と副コーナ刃を設け、図３に示す、主コーナ刃１は回転軌跡３と重複しており、副コーナ刃２は、減寸量が刃径の３％で設けている。比較のため、比較例４は、同仕様のエンドミルのコーナ刃を不等間隔±５°に配置したもの、比較例５は、不等間隔±４６．８に配置した。
Example 3 of the present invention is an ultra-fine cemented carbide solid coated with a TiAlN coating, and has an edge diameter of 10 mm and a 4-flute end mill, as shown in FIGS. 1 and 2, at a position facing the end mill axis. A pair of main corner blades and sub-corner blades are provided. As shown in FIG. 3, the
上記５試料を切削諸元、被削材にＨＲＣ４０のプリハードン鋼を用い、回転数を１６８０ｍｉｎ−１、１刃当り送り量を０．６２５ｍｍ／刃、送り速度で４２００ｍｍ／ｍｉｎ、エンドミル軸方向ピッチ０．６ｍｍ、工具突き出し長さ４０ｍｍで、フラットな被削材に、長さ１００ｍｍ、幅６５ｍｍ、深さ３０ｍｍ、側壁に３°の勾配を有するポケットをエアブローを用い、等高線加工で彫込む加工を行い、その切削状態、損傷状態を観察した。その結果、本発明例１〜３は、同時切削刃が増えるポケット形状の隅部の加工時においても、ビビリ・振動はほとんどなく、１形状を安定して加工できた。比較例４、５は、不等間隔に配置した効果が得られず、ビビリ・振動が大きく、特にポケット形状の隅部の加工時のビビリ・振動が激しく、ポケット加工の深さ２．１ｍｍの時点で、欠損を生じ、寿命となった。
The five samples cutting specifications, using pre-hardened steel HRC40 to workpiece, the
１ 主コーナ刃
２ 副コーナ刃
３ 減寸量
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003285542A JP3883009B2 (en) | 2003-08-04 | 2003-08-04 | End mill for high feed cutting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003285542A JP3883009B2 (en) | 2003-08-04 | 2003-08-04 | End mill for high feed cutting |
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| JP2005052924A JP2005052924A (en) | 2005-03-03 |
| JP3883009B2 true JP3883009B2 (en) | 2007-02-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110162409A1 (en) * | 2010-01-07 | 2011-07-07 | Denso Corporation | Air conditioning system for vehicle |
| JP5803647B2 (en) | 2011-02-16 | 2015-11-04 | 三菱日立ツール株式会社 | End mill |
| JP5925250B2 (en) | 2014-07-07 | 2016-05-25 | ユニオンツール株式会社 | Square end mill |
| CN109226852A (en) * | 2018-10-31 | 2019-01-18 | 江苏巨力鼎鑫机械有限公司 | Multiple-cutting-edge T-type milling cutter |
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