JP2007331039A - Formed cutter - Google Patents
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- JP2007331039A JP2007331039A JP2006162957A JP2006162957A JP2007331039A JP 2007331039 A JP2007331039 A JP 2007331039A JP 2006162957 A JP2006162957 A JP 2006162957A JP 2006162957 A JP2006162957 A JP 2006162957A JP 2007331039 A JP2007331039 A JP 2007331039A
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Abstract
Description
本願発明は、タービンブレードの翼根又は該タービンブレードを取り付けるタービンディスク側の取り付け部の加工に用いるタービンブレード取り付け部加工用の総形フライスに関する。 The present invention relates to a general-purpose milling cutter for machining a turbine blade attachment portion used for machining a blade root of a turbine blade or an attachment portion on a turbine disk side to which the turbine blade is attached.
タービンブレードの翼根又は該タービンブレードを取り付けるタービンディスク側の取り付け部のフォームの粗加工には、波形切れ刃を備えた総形フライスが用いられているが、テーパを含むラフィングエンドミルの波状切れ刃は、切れ刃に垂直方向に刻み込まれているが、総形フライスでは、フォ−ムが複雑であるため、波状切れ刃を傾斜面、円弧部に設ける事態が生じる。
特許文献１は、連結部を含む凹所の長さ寸法と基準形状部の長さ寸法Ｌとを加算したピッチＰは、例えば外周切れ刃の全長に亘って一定とされるが、径寸法の変化などに応じて変化させることも可能とし、該外周切れ刃の刃数をｎとした時、Ｐ／ｎずつ位相がずれるように設けられており、特許文献２は、総形フライスを構成する材料が超硬合金で、該総形フライスは回転軌跡で凹又は凸状曲線である総形のフォームを設けた例が、特許文献３は、複数の外周切れ刃には、それぞれ径寸法が周期的に滑らかに変化する波形のラフィング切れ刃が設けられているとともに、該ラフィング切れ刃の位相は該複数の外周切れ刃の相互間で軸方向にずらした例が、記載されている。
In Patent Document 1, the pitch P obtained by adding the length dimension of the recess including the connecting portion and the length dimension L of the reference shape portion is, for example, constant over the entire length of the outer peripheral cutting edge. It is also possible to change according to the change, and when the number of outer peripheral cutting edges is n, it is provided so that the phase is shifted by P / n. An example in which the material is a cemented carbide, and the overall shape mill is provided with a foam having a concave or convex curve on the rotation locus. An example is described in which a luffing cutting edge having a smoothly changing waveform is provided, and the phase of the luffing cutting edge is shifted in the axial direction between the plurality of peripheral cutting edges.
波形状のラフィング切れ刃は、通常、２刃〜６刃でセットとなり、１枚刃となるように設計される、特に、タービンブレード取り付け部のフォームは凹凸がある特殊な輪郭であり、その具体的な態様について説明する。
第１に、径がテーパ角一定で拡がるテーパ部は、切れ刃のフォ−ムが該フライスの回転軸と直交する平面に対して小さな角度である場合は、切れ刃の斜面が切削するように作用し、切屑厚みが薄くなって擦過現象が増し、波状切れ刃を刻み込む方向が切削方向とは一致しなくなるため、その効果が希薄になって切削抵抗が増加する。切れ刃のフォ−ムが３０゜以下の角度で傾斜するときは、該角度より小さい角度で傾斜する直線部分を凸略円弧と凹略円弧の間に設けることによって波状切れ刃凸部頂点の間隔を大きくして本来の波状切れ刃の効果を得ることができる。
第２に、テーパ部から、円弧部を経て、径が小さくなる様な円弧部は、凸状の円弧部であり（以下、単に凸円弧部と記す。）、特に凸円弧部が、隣接する波状切れ刃間で６０度以上湾曲するようになると、両波状切れ刃のいずれかは上述の傾斜面に位置することになり、且つ、湾曲部分が短いからこの切れ刃を１部分ずつオフセットして１刃と次刃とで出入りさせ、波状切れ刃の効果を得て切削性を高めている。この凸円弧部は、刃径も大きくなり、切削速度の影響により、高速度鋼を用いた場合には、最も、摩耗が進む箇所となる。
第３に、凸円弧部から、径が小さくなるテーパ部（以下、単に逆テーパ部と記す。）は、径が大きくなるテーパ部に比べ、切り込み量が一定ではなくなり、切削負荷が変動する。特に、傾斜面が急角度の場合は側面で擦過現象が大きいので切れ刃の一部を間引くことで緩和でき、切れ刃の直径差が大きい場合には小径部分で１刃と次刃の間隔が狭まり、切れ味が低下するので間引くことで、切削負荷が適切なものとなる。
本発明は以上のような背景のもとになされたものであり、粗加工用の総形フライスの上記テーパ部、凸円弧部及び逆テーパ部について、波状切れ刃を設け、且つ、位相を設けても、その部位により、刃径が変化することから切削速度も変化し、更に、切削負荷も変化するため、耐摩耗性も、耐チッピング性も不十分であった。
The corrugated luffing cutting edge is usually designed as a set of 2 to 6 blades and a single blade. Especially, the form of the turbine blade mounting part has a special contour with irregularities, its specific A typical embodiment will be described.
First, the taper portion whose diameter expands at a constant taper angle is such that when the form of the cutting edge is a small angle with respect to a plane perpendicular to the rotation axis of the milling cutter, the slope of the cutting edge cuts. It acts, the chip thickness is reduced and the fretting phenomenon is increased, and the direction in which the wavy cutting edge is cut does not coincide with the cutting direction, so that the effect becomes dilute and the cutting resistance increases. When the form of the cutting edge is inclined at an angle of 30 ° or less, a linear portion inclined at an angle smaller than the angle is provided between the convex arc and the concave arc so that the interval between the wavy cutting edge vertices is increased. The effect of the original wavy cutting edge can be obtained by enlarging.
Secondly, an arc portion whose diameter decreases from the taper portion through the arc portion is a convex arc portion (hereinafter simply referred to as a convex arc portion), and particularly, the convex arc portion is adjacent to the arc portion. If it is curved 60 degrees or more between the wavy cutting edges, either of the wavy cutting edges will be located on the above-mentioned inclined surface, and since the curved portion is short, this cutting edge is offset by one part at a time. It is made to go in and out with one blade and the next blade, and the effect of the wavy cutting blade is obtained to improve the cutting performance. The convex arc portion also has a large blade diameter, and becomes the place where wear proceeds most when high speed steel is used due to the influence of the cutting speed.
Thirdly, a taper portion (hereinafter simply referred to as a reverse taper portion) whose diameter decreases from the convex arc portion is not constant and the cutting load varies as compared with a taper portion whose diameter increases. In particular, when the inclined surface has a steep angle, the scratching phenomenon is large on the side surface, so that it can be alleviated by thinning out a part of the cutting edge. When the diameter difference between the cutting edges is large, the distance between one blade and the next blade is small in the small diameter portion. Since it narrows and sharpness decreases, the cutting load becomes appropriate by thinning out.
The present invention was made based on the background as described above, and provided with a wavy cutting edge and a phase for the tapered portion, the convex arc portion, and the reverse tapered portion of the rough milling cutter. However, since the blade diameter changes depending on the part, the cutting speed also changes, and the cutting load also changes, so that the wear resistance and chipping resistance are insufficient.
本願発明は、タービンブレード取り付け部加工用総形フライスにおいて、該総形フライスは、そのフォームが、径がテーパ角一定で拡がるテーパ部、テーパ部から凸円弧部を経て、径が小さくなる逆テーパ部、とを有し、前記テーパ部は、略一定の波形状とし、前記凸円弧部は、３刃で１セットとなるように刃を設け、第１は、凸円弧部のテーパ部よりのフォーム輪郭を、第２は、凸円弧部の逆テーパ部よりのフォーム輪郭を、第３は、テーパ部の波状切れ刃の中間点〜最下点の位置から、更に、逆テーパ部の波状切れ刃の中間点〜最下点の位置に繋いだことを特徴とする総形フライスであり、本願発明を適用することにより、凸円弧部は、耐チッピング性に優れ、テーパ部の波状切れ刃と併せ、振動、ビビリが減少し、且つ、切れ刃の輪郭がタービンブレード取り付け部のフォ−ムの狂いを抑えることができた。更に、前記テーパ部の波のピッチの長さを０．８〜１．６ｍｍの範囲、波高さは、ピッチの長さの０．０１倍〜０．８倍、波切れ刃の凸部の頂点のアールは、ピッチの長さの０．２倍〜５倍に設け、前記テーパ部の波状切れ刃の位相は、３刃で１セットとなるように、ピッチの長さの１／３、に設けたことを特徴とする総形フライスである。 The present invention relates to an overall milling machine for machining a turbine blade mounting portion, wherein the overall milling machine has a tapered portion whose diameter expands with a constant taper angle, and a reverse taper whose diameter decreases from the tapered portion through a convex arc portion. The taper portion has a substantially constant wave shape, the convex arc portion is provided with a blade so that one set is composed of three blades, and the first is from the taper portion of the convex arc portion. The second is the foam contour from the reverse taper part of the convex arc part, and the third is from the middle point to the lowest point of the wavy cutting edge of the taper part. It is a general-purpose milling cutter characterized in that it is connected to the position between the middle point and the lowest point of the blade, and by applying the present invention, the convex arc portion has excellent chipping resistance, and the wavy cutting edge of the tapered portion and In addition, vibration and chatter are reduced, and the contour of the cutting edge Follower turbine blade attachment portion - it was possible to suppress the deviation of beam. Further, the wave pitch length of the taper portion is in the range of 0.8 to 1.6 mm, the wave height is 0.01 to 0.8 times the pitch length, and the peak of the convex portion of the wave cutting edge. Is set at 0.2 to 5 times the length of the pitch, and the phase of the wavy cutting edge of the tapered portion is 1/3 of the length of the pitch so that one set of three blades. A general-purpose milling machine characterized by being provided.
以上のように本願発明によれば、タービンブレード取り付け部加工用総形フライスにおいて、複雑なフォ−ムに適した波状切れ刃をテーパ部、凸円弧部に設けることにより、高能率、長寿命の総形フライスを提供することが可能となった。 As described above, according to the invention of the present application, in the general-purpose milling machine for machining the turbine blade mounting portion, the wavy cutting edge suitable for the complex form is provided in the tapered portion and the convex arc portion, thereby achieving high efficiency and long life. It has become possible to provide a complete milling machine.
本願発明は、タービンブレード取り付け部加工用総形フライスにおいて、該総形フライスのテーパ部は、波形切れ刃を凸略円弧と凹略円弧の連続した略一定の波形状とし、成形したフォーム上に波状切れ刃が起因する食い込み傷やバリ等の発生が無く、滑らかな加工面を得ることができる。テーパ部では、波状切れ刃は凸略円弧と凹略円弧の連続した波状とし、波状切れ刃の凹凸の差である波高さは隣接する波状切れ刃凸部頂点とのピッチの長さの０．０１倍〜０．８倍が望ましく、０．０１倍未満では切り屑を十分に分断することができず、０．８倍を越えると滑らかに結びづらくなるためである。
波状切れ刃の凸部の頂点のアール半径は、波状切れ刃凸部頂点のピッチの長さである波ピッチの長さの０．２倍〜５倍としても良く、０．２倍未満では円弧が小さすぎて設ける意味が無く、５倍を越えた大きな値で設けると切れ刃として長くなり過ぎるため、切れ刃に連なる凸略円弧の半径は、該ピッチの長さの０．２倍〜５倍とした。波状切れ刃の凸部頂点は、切削応力が集中しやすく、波状切れ刃凸部頂点のチッピングが生じやすいが、波状切れ刃の波高さを小さくし、波状切れ刃凸部頂点のアールを大きく設定することにより、切削応力を分散することができ、耐チッピング性を向上することができるため、好ましくは、波状切れ刃凸部頂点のピッチの長さに対して、波高さは０．０１倍〜０．５倍が望ましく、凸部頂点のアールは０．５倍〜５倍、更に好ましくは１倍から５倍が望ましい。
The invention of the present application is directed to a turbine blade mounting part machining total shape mill, wherein the taper portion of the total shape milling has a corrugated cutting edge having a substantially constant wave shape in which a convex arc and a concave arc are continuously formed on a molded foam. There is no occurrence of biting scratches and burrs caused by the wavy cutting edge, and a smooth machined surface can be obtained. In the taper portion, the wavy cutting edge has a continuous wave shape of a convex substantially circular arc and a concave substantially circular arc, and the wave height, which is the difference in the unevenness of the wavy cutting edge, is 0. This is because 01 times to 0.8 times is desirable, and if it is less than 0.01 times, the chips cannot be sufficiently divided, and if it exceeds 0.8 times, it is difficult to smoothly tie them.
The radius of the vertex of the convex portion of the wavy cutting edge may be 0.2 to 5 times the length of the wave pitch, which is the length of the pitch of the convex portion of the wavy cutting edge. Is too small to be provided, and if it is provided with a large value exceeding 5 times, it becomes too long as a cutting edge. Therefore, the radius of the convex arc that continues to the cutting edge is 0.2 to 5 times the length of the pitch. Doubled. The peak of the convex part of the wavy cutting edge tends to concentrate cutting stress, and chipping of the convex part of the wavy cutting edge tends to occur, but the wave height of the wavy cutting edge is reduced, and the radius of the convex part of the wavy cutting edge is set large. Since the cutting stress can be dispersed and the chipping resistance can be improved, the wave height is preferably 0.01 times to the length of the pitch of the ridges of the wavy cutting edge protrusions. 0.5 times is desirable, and the radius of the apex of the convex portion is desirably 0.5 times to 5 times, more preferably 1 time to 5 times.
次に、前記凸円弧部は、テーパ部の終端のラフィング切れ刃の状態に応じて、３刃で１セットとなるように刃を設け、第１刃は、凸円弧部のテーパ部よりのフォーム輪郭を、第２刃は、凸円弧部の逆テーパ部よりのフォーム輪郭を、第３刃は、テーパ部の波状切れ刃の中間点〜最下点の位置のフォーム輪郭から、更に、逆テーパ部の切れ刃の中間点〜最下点の位置に繋ぐことにより、テーパ部から、逆テーパ部へと繋ぐ３枚の刃をテーパ部、逆テーパ部の波形状に、切り屑を分断する長さが変化せずに繋ぐことが出来、粗加工におけるフォ−ムの狂いを抑え、溝加工中の切り屑の取り扱い、排出性を考慮し、第１刃〜第３刃の各切れ刃の損傷、特にチッピング等を防止することが出来る。 Next, according to the state of the luffing cutting edge at the end of the taper portion, the convex arc portion is provided with a blade so that one set is composed of three blades, and the first blade is formed from the taper portion of the convex arc portion. The second blade is the foam contour from the reverse taper portion of the convex arc portion, and the third blade is the reverse taper from the foam contour at the midpoint to the lowest point of the wavy cutting edge of the taper portion. By cutting from the middle point to the lowest point of the cutting edge of the part, the three blades connecting from the taper part to the reverse taper part can be cut into chips of the taper part and reverse taper part. It is possible to connect without changing the shape, suppresses the deviation of the form during rough machining, and handles the cutting edge during grooving. In particular, chipping and the like can be prevented.
前記逆テーパ部は、刃径が小さくなること、テーパ角が、１４０〜１６０度と大きいため、上記テーパ部の様に波状切れ刃を設けた場合には、切り込み量が変動し、切れ刃と被削材とがこすれあい、振動・ビビリ等の原因となり、甚だしい場合には、欠損に至る。本願発明では、径が小さくなり、且つ、テーパ角が大きな箇所では、凸円弧部からの切れ刃から続いて、切れ刃の頂点から、略直線状に、総形のフォ−ムの傾斜角Ａよりさらに小さい傾斜角Ｂで設け、更に、前記波状切れ刃に相当するピッチ長さを０．８〜１．６ｍｍと長くし、そのピッチ長さの０．５５〜０．８０倍の位置の最下点まで略直線状の切れ刃を設けることにより、切れ刃と被削材が接触しないように設けている。
次に、ピッチ長さの０．５５〜０．８０倍の位置の最下点から、次の頂点までは、波状に設けて、切り込みの負荷が頂点付近に集中しないように配置する。傾斜角Ｂは、総形のフォ−ムの傾斜角Ａより１〜１０度小さくしたのは、切れ刃と被削材の接触を無くすには、前記逆テーパ角との関係で、１度未満では接触を防ぎきれず、１０度を超えると、総形のフォ−ムとの狂いが大きくなるため、１〜１０度の範囲に限定した。また、前記逆テーパ部の頂点から最下点までの深さは、前記凸円弧部の波形状の深さと略同じに設けると、総形のフォ−ムとの狂いが同程度となるため、好ましい。
Since the reverse taper portion has a small blade diameter and a large taper angle of 140 to 160 degrees, when a wavy cutting edge is provided like the taper portion, the cutting amount varies, It will rub against the work material and cause vibrations and chattering. In the present invention, in a portion where the diameter is small and the taper angle is large, the inclination angle A of the total form is formed substantially linearly from the top of the cutting edge following the cutting edge from the convex arc portion. The pitch length corresponding to the wavy cutting edge is increased to 0.8 to 1.6 mm, and the pitch is 0.55 to 0.80 times the pitch length. By providing a substantially linear cutting edge up to the lower point, the cutting edge and the work material are provided so as not to contact each other.
Next, from the lowest point of the position 0.55 to 0.80 times the pitch length to the next vertex, it is provided in a wave shape and arranged so that the cutting load is not concentrated near the vertex. The inclination angle B is 1 to 10 degrees smaller than the inclination angle A of the overall form. In order to eliminate the contact between the cutting edge and the work material, the inclination angle B is less than 1 degree in relation to the reverse taper angle. Then, contact could not be prevented, and if it exceeded 10 degrees, the deviation from the total form would increase, so it was limited to the range of 1 to 10 degrees. Further, if the depth from the apex of the reverse taper portion to the lowest point is substantially the same as the depth of the wave shape of the convex arc portion, the deviation from the form of the total shape is about the same, preferable.
次に、総形フライスの刃長間における刃径の変化に拘わらず外周二番面の落ち量をほぼ一定としても良い。ここで外周二番面の落ち量とは、外周切れ刃の外周二番面が回転軸を中心として切れ刃からの回転角が等しい位置における切れ刃回転軌道と外周二番面とのピッチであり、再研削による性能低下がなく、且つ再研削による加工形状の維持および再研削自体が容易となり、廃却までのトータル的な工具寿命が向上する。次に、外周二番面の回転方向後方に外周三番面を有しても良い。切れ刃強度及び再研削回数の面から外周二番面幅を大きく設定することが考えられる。しかしながら外周二番面は外周すくい面と共に切れ刃稜線を形成し、面粗さ等の精度が要求される部位であるため、工数が増え、製造コストが高くなる。そのため、外周二番面の幅を必要最小限に設定し、外周二番面の回転方向後方に外周三番面を設けた。これにより、外周逃げ面幅を一層大きく設定することも可能となり、切れ刃強度が得られ、且つ、外周三番面は切れ刃稜線に関与しないため、精度もさほど必要とせず、粗い砥石で高能率に加工ができ、製造コストを下げることができる。ここで、外周二番面の幅は、総形フライスの刃径の５％〜１５％が望ましく、５％未満であると、再研削回数が大幅に減少し、また、実際１５％を超えて再研削を行うと、形状精度は維持できているが、寸法精度が外れ、必要でない外周二番面を有することになり、製造コストのみ高くなるからであり、１５％以下とした。また、同様の目的で超硬合金製造過程において、仮焼結時に刃溝や外周三番面、総形フォームの荒加工等を行っても良く、刃溝、外周三番面はさほど精度を必要としないため、最終研磨工程を削減することが可能であり、総形フォームの荒加工は最終研磨工程を軽減でき、製造コストを軽減できる。 Next, the amount of fall of the outer peripheral second surface may be made substantially constant regardless of the change in the blade diameter between the blade lengths of the overall milling cutter. Here, the fall amount of the outer peripheral second surface is the pitch between the cutting edge rotation trajectory and the outer peripheral second surface at the position where the outer peripheral second surface of the outer peripheral cutting edge has the same rotation angle from the cutting edge about the rotation axis. Further, there is no performance degradation due to regrinding, and it becomes easy to maintain the work shape and regrind itself by regrinding, and the total tool life until disposal is improved. Next, you may have a 3rd outer peripheral surface in the rotation direction back of the 2nd outer peripheral surface. It is conceivable to set the outer peripheral second surface width larger from the surface of the cutting edge strength and the number of regrinds. However, the outer peripheral second surface forms a cutting edge ridge line together with the outer peripheral rake face, and is a part that requires precision such as surface roughness, so the number of man-hours increases and the manufacturing cost increases. Therefore, the width of the outer peripheral second surface is set to the minimum necessary, and the outer peripheral third surface is provided behind the outer peripheral second surface in the rotation direction. As a result, the outer peripheral flank width can be set to be larger, the cutting edge strength can be obtained, and the outer peripheral third surface is not related to the cutting edge ridge line, so the accuracy is not so much required, and a rough grindstone is used. It can be processed efficiently and the manufacturing cost can be reduced. Here, the width of the outer peripheral second surface is desirably 5% to 15% of the blade diameter of the overall milling cutter, and if it is less than 5%, the number of times of re-grinding is greatly reduced and actually exceeds 15%. When the regrinding is performed, the shape accuracy can be maintained, but the dimensional accuracy is lost, and there is an unnecessary second outer peripheral surface, which increases the manufacturing cost only, and is set to 15% or less. For the same purpose, in the cemented carbide manufacturing process, it is possible to perform roughing of the blade groove, outer peripheral third surface, and general form foam during preliminary sintering, and the blade groove and outer peripheral third surface require much precision. Therefore, it is possible to reduce the final polishing step, and rough machining of the total form foam can reduce the final polishing step and reduce the manufacturing cost.
更に、本願発明の総形フライスに被覆を施す場合には、被覆は周期率表第４ａ族、第５ａ族、第６ａ族の遷移金属、低融点金属、希土類金属、またはＡｌの炭化物、窒化物、酸化物、硼化物、硬質窒化硼素、硬質炭素さらにこれらの固容体または混合体からなる群のうちから選ばれた１種または２種以上の硬質性膜及び／又はＭｏＳ等の潤滑性膜を１層または２層以上の多層で０.２〜２０μの厚みで被覆すると、耐摩耗性が向上でき、更に寿命を長くすることができる。以下、本願発明を実施例に基づいて説明する。 Furthermore, when coating is applied to the general-purpose milling cutter of the present invention, the coating is made of transition metals, low melting point metals, rare earth metals, or Al carbides and nitrides of the 4a group, 5a group, and 6a group of the periodic table. One or two or more hard films selected from the group consisting of oxides, borides, hard boron nitride, hard carbon, and their solids or mixtures, and / or lubricating films such as MoS. When a single layer or a multilayer of two or more layers is coated with a thickness of 0.2 to 20 μm, the wear resistance can be improved and the life can be further extended. Hereinafter, the present invention will be described based on examples.
（実施例１）
図１〜図３は、本発明例１は、高速度工具鋼製のクリスマスツリー形のフォームを有するタービンブレードの翼根部の荒加工に用いる総形フライスである。
図１の総形フライスは、外周切れ刃、それに続く外周逃げ面に波状を付与した２番取り刃形の総形フライスであり、フォームを形成する外周切れ刃は、テーパ状に刃径が大きくなるテーパ部１、それに続く凸円弧部２、テーパ状に刃径が小さくなる逆テーパ部３、それに続く凹円弧部を経て、次のテーパ状に刃径が大きくなるテーパ部１へと複数回連なる総形フライスである。
テーパ部の波状切れ刃は、３刃でセットとなるよう、１刃、２刃、３刃で各々１／３づつピッチをずらし、図２に示す、テーパ切れ刃に沿って波深さ４を０．２ｍｍ、ピッチ長さ５を１ｍｍ、波状切れ刃の凸部の頂点のアール半径６を０．４ｍｍに設けている。次に、凸円弧部は、３刃でセットとなるよう、第１刃、第２刃、第３刃を、第１刃は、凸円弧部のテーパ部よりのフォーム輪郭を、第２刃は、凸円弧部の逆テーパ部よりのフォーム輪郭を、図３に示す、第３刃は、テーパ部の波状切れ刃の最下点と略同じ位置のフォーム輪郭とし、更に、逆テーパ部の波状切れ刃の最下点と略同じ位置に繋いだ凸状の切れ刃を設ける。図４に示す、逆テーパ部３では、凸円弧部からの波状切れ刃の頂点より、略直線状に、総形のフォ−ムの傾斜角Ａよりさらに小さい傾斜角Ｂ＝８度で、ピッチ長さの０．７０倍の最下点まで設け、該最下点から次の頂点までを波状に設けている。該外周逃げ面の落ち量はクリスマスツリー形のフォームの各部位において一定としたものである。更に、逃げ面の落ち量が該フォームの各部位において一定であるため、切削条件を高くできるだけでなく再研磨後も維持でき、さらに、再研磨後はフォームの変化がなく、再研磨自体もすくい面側から行えるため、容易となった。
Example 1
FIGS. 1 to 3 show a first example of the present invention, which is a general-purpose milling cutter used for roughing a blade root portion of a turbine blade having a Christmas tree-shaped foam made of high-speed tool steel.
1 is a two-blade cutting-edge type total milling cutter with an outer peripheral cutting edge followed by a corrugation on the outer peripheral flank. The outer peripheral cutting edge forming the foam has a taper with a large blade diameter. The taper portion 1 that follows, the
The waved cutting edge of the taper part is shifted by 1/3 each for 1 blade, 2 blades, 3 blades so that 3 blades are set, and the
（実施例２）
本発明例１を用いて、切削諸元で、工具回転数を３６０ｍｉｎ−１とし、送り速度を可変として溝切削加工を行った。評価は、機械全体の振動の大きさ、ビビリ音の程度、で行った。
本発明例１は、送り速度が１５ｍｍ／ｍｉｎ、３０ｍｍ／ｍｉｎであっても、切り屑が細かに分断され、溝削りにおいても、振動、ビビリとも小さく、充分に使用可能であった。
(Example 2)
Using Example 1 of the present invention, the cutting speed was set to 360 min −1 and the groove cutting was performed with the feed rate being variable. The evaluation was performed based on the vibration level of the entire machine and the level of chatter noise.
In Example 1 of the present invention, even when the feed rates were 15 mm / min and 30 mm / min, the chips were finely divided, and the vibration and chattering were small even in the case of grooving.
（実施例３）
本発明例１と同仕様で、本発明例２として、第１刃は、凸円弧部のテーパ部よりのフォーム輪郭を切削し、第２刃は、凸円弧部の逆テーパ部よりのフォーム輪郭を切削し、第３刃は、テーパ部の波状切れ刃の中間点と略同じ位置まで凸状に切れ刃を設け、比較３として、第３刃は、テーパ部の波状切れ刃の頂点と略同じ位置まで凸状に切れ刃を設けた。実施例２と同様に、溝切削加工を行った。
本発明例２、比較例３とも、送り速度が１５ｍｍ／ｍｉｎ、３０ｍｍ／ｍｉｎであっても、切り屑が細かに分断されたが、溝削りにおいても、振動、ビビリとも小さく、充分に使用可能であったが、比較例３は、第１刃と第３刃、第２刃と第３刃の頂点が近くなりすぎ、テーパ部、逆テーパ部に、波状切れ刃にならない凸状の切れ刃を設けざるを得なくなり、フォームの狂いが生じた。
(Example 3)
In the same specification as the present invention example 1, as the present invention example 2, the first blade cuts the foam contour from the tapered portion of the convex arc portion, and the second blade is the foam contour from the reverse tapered portion of the convex arc portion. The third blade is provided with a cutting edge that is convex to the same position as the midpoint of the wavy cutting edge of the tapered portion. As a
In both Invention Example 2 and Comparative Example 3, even if the feed rate was 15 mm / min and 30 mm / min, the chips were finely divided, but even in grooving, both vibration and chatter are small and can be used sufficiently However, in Comparative Example 3, the first blade and the third blade, the second blade and the third blade are too close to each other, and the taper portion and the reverse taper portion are convex cutting edges that do not become wavy cutting edges. I was forced to set up a form, and the form went wrong.
１ テーパ部
２ 凸円弧部
３ 逆テーパ部
４ 波深さ
５ ピッチ長さ
６ 波状切れ刃の凸部の頂点のアール半径
７ フォーム
Ａ 総形のフォ−ムの傾斜角
Ｂ 切れ刃の傾斜角
DESCRIPTION OF SYMBOLS 1
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| JP2001212711A (en) * | 2000-02-03 | 2001-08-07 | Hitachi Tool Engineering Ltd | Formed milling cutter for rough cutting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001212711A (en) * | 2000-02-03 | 2001-08-07 | Hitachi Tool Engineering Ltd | Formed milling cutter for rough cutting |
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