JP5964261B2 - Machining method of thin plate workpiece with milling tool - Google Patents
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- 238000003754 machining Methods 0.000 title claims description 44
- 238000003801 milling Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 title description 9
- 238000006073 displacement reaction Methods 0.000 claims description 57
- 238000005520 cutting process Methods 0.000 claims description 53
- 238000012545 processing Methods 0.000 claims description 42
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 10
- 238000003672 processing method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 1
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- 230000003746 surface roughness Effects 0.000 description 1
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Description
本発明はフライス工具による薄板状被加工物の加工方法に関し、特にエンドミル工具を用いた薄板材料の加工の際に発生するびびり振動を効果的に抑制する方法に関する。 The present invention relates to a method for processing a thin plate workpiece by a milling tool, and more particularly, to a method for effectively suppressing chatter vibration generated when processing a thin plate material using an end mill tool.
一般に、剛性の低い薄板状の被加工物の表面を切削加工する場合、被加工物の剛性が低いために切削中に発生する切削抵抗によりびびり振動が発生することが多い。びびり振動が発生すると、仕上げ面粗さが増大するため加工品質上問題となる他、工具の欠損等を引き起こすことがあり、品質面、加工の信頼性に大きな問題が生じる。そのため、びびり振動が発生しないように切削抵抗を小さくするような切削条件が選択されるが、この条件は加工効率が低い問題がある。 Generally, when cutting the surface of a thin plate-like workpiece having low rigidity, chatter vibration is often generated due to cutting resistance generated during cutting because the workpiece has low rigidity. When chatter vibration occurs, the finished surface roughness increases, which may cause a problem in machining quality, and may cause tool breakage, which causes a serious problem in quality and machining reliability. For this reason, a cutting condition is selected so as to reduce the cutting resistance so that chatter vibration does not occur, but this condition has a problem of low machining efficiency.
そのため、これまでに特許文献１や特許文献２などに示されるように薄板の両面から同時に加工を行うことにより振動方向である板厚方向の切削抵抗をつりあわせ、びびり振動の発生を抑制することが提案されている。しかしながらこれらの方法は専用の加工機を用いなくてはならず、設備コストが高くなり、実用性に問題がある。 Therefore, as shown in Patent Document 1 and Patent Document 2 so far, by simultaneously processing from both sides of the thin plate, the cutting resistance in the plate thickness direction, which is the vibration direction, is balanced and the occurrence of chatter vibration is suppressed. Has been proposed. However, these methods must use a dedicated processing machine, resulting in high equipment costs and problems in practicality.
そこで、本発明は、こうした事情に鑑みて完成されたもので、加工効率を低下させず、また専用の加工機などを必要とせずに加工時のびびり振動を有効に抑制する薄板状被加工物のフライス工具による加工方法を提供することをその課題とする。 Therefore, the present invention has been completed in view of such circumstances, and a thin plate-like workpiece that effectively suppresses chatter vibration during processing without lowering the processing efficiency and without requiring a dedicated processing machine or the like. It is an object of the present invention to provide a machining method using a milling tool.
本発明は、上記課題を解決するための具体的手段として、以下の加工方法を提案する。 The present invention proposes the following processing methods as specific means for solving the above-described problems.
すなわち、薄板状被加工物をフライス工具により平面加工するに際して、
（１）工具軸方向切込み量及び工具ねじれ角の初期条件を設定し、
（２）該初期条件にて前記薄板状被加工物のテスト加工を実施し、
（３）該テスト加工時における前記薄板状被加工物の変位を測定し、
（４）該変位量が十分に小さいかどうかを判定し、
（５）該変位量が十分に小さいと判定できた場合は、前記テスト加工時の初期条件を量産 加工条件として選択し、
（６）一方、前記変位量が十分に小さいと判定できなかった場合は、更に前記薄板状被加 工物の変位の方向が正方向であるかどうかを判定し、
（７）該変位の方向が正方向と判定できた場合は、前記初期条件における工具軸方向切込 み量または工具ねじれ角を増加させる調整を行ない、また、該変位の方向が正方向 と判定できない場合は、前記初期条件における工具軸方向切込み量または工具ねじ れ角を減少させる調整を行ない、
（８）これら調整後の加工条件にて上記（２）〜（７）の前記薄板状被加工物のテスト加 工、測定及び判定を同様に実施し、薄板状被加工物の変位量が十分に小さいと判定 できるまで加工条件の調整を繰り返して行なった後、変位量が十分に小さいと判定 できた場合のテスト加工時の加工条件を量産加工条件として選択する、
ことを特徴とする薄板状被加工物のフライス工具による平面加工方法である。
In other words, when processing a thin plate workpiece with a milling tool,
(1) Set the initial conditions of the cutting depth and tool helix angle in the tool axis direction,
(2) Conduct test processing of the thin plate workpiece under the initial conditions,
(3) measuring the displacement of the thin plate-like workpiece during the test machining;
(4) Determine whether the amount of displacement is sufficiently small,
(5) If it can be determined that the amount of displacement is sufficiently small, the initial conditions for the test machining are selected as the mass production machining conditions,
(6) On the other hand, when it cannot be determined that the amount of displacement is sufficiently small, it is further determined whether or not the direction of displacement of the thin plate workpiece is a positive direction,
(7) If the direction of the displacement can be determined as the positive direction, adjustment is made to increase the cutting depth or the tool helix angle in the tool axis direction in the initial condition, and the direction of the displacement is determined as the positive direction. If this is not possible, make adjustments to reduce the cutting depth in the tool axis direction or the tool helix angle in the initial conditions,
(8) Test processing, measurement, and determination of the thin plate workpieces (2) to (7) are performed in the same manner under these adjusted processing conditions, and the displacement of the thin plate workpiece is sufficient. After iteratively adjusting the machining conditions until it can be judged to be small, the machining conditions at the time of test machining when the displacement is judged to be sufficiently small are selected as mass production machining conditions.
A flat processing method using a milling tool for a thin plate workpiece.
本発明によれば、エンドミルなどフライス工具による切削加工に際し、剛性の低い材料で構成された薄板状の被加工物を対象とした場合であっても、加工効率を低下させることなく、また専用の加工機などを必要とせずに加工時のびびり振動を有効に抑制するという優れた効果を奏する。 According to the present invention, in the case of cutting with a milling tool such as an end mill, even when a thin plate-like workpiece made of a material having low rigidity is targeted, the processing efficiency is not reduced, There is an excellent effect of effectively suppressing chatter vibration during processing without requiring a processing machine or the like.
本発明について、図面を参照しながら以下に詳述して行くことにする。 The present invention will be described in detail below with reference to the drawings.
先ず、本発明の加工方法の採用に当って、びびり振動の発生を抑制する解決原理に関して説明する。図１は薄板状被加工物の平面加工の概要図であるが、薄板状の被加工物を加工する場合は、同図に示すように板厚方向にびびり振動を生じる。これは、前述のように、加工中に発生する板厚方向の切削抵抗に起因するものである。このため、加工中に発生する板厚方向の切削抵抗を理想的にはゼロにすることによりびびり振動の発生を抑制することが可能となる。 First, the solution principle for suppressing the occurrence of chatter vibration will be described in adopting the processing method of the present invention. FIG. 1 is a schematic diagram of planar processing of a thin plate workpiece, but when a thin plate workpiece is processed, chatter vibration is generated in the plate thickness direction as shown in FIG. As described above, this is due to the cutting resistance in the plate thickness direction that occurs during machining. For this reason, the occurrence of chatter vibration can be suppressed by ideally reducing the cutting resistance in the thickness direction generated during machining to zero.
しかしながら、一般的なフライス工具は図１において下向きに切削抵抗を発生させる。特にエンドミル工具の場合は、図２にその刃先先端部の模式図を示すように、工具の底刃先端部付近の切れ刃が下向きの切削抵抗を発生させ、ねじれ刃を持つ側刃は上向きの切削抵抗を発生させることになる。 However, a typical milling tool generates a cutting force downward in FIG. Particularly in the case of an end mill tool, as shown in the schematic diagram of the tip of the cutting edge in FIG. Cutting resistance will be generated.
つまり、フライス工具、とりわけエンドミル工具ではねじれ角を大きくすることにより、より大きな上向きに切削抵抗を発生させることが可能となる。さらに、このエンドミル工具の軸方向の切込み量を増加させることにより、側刃の切削量の割合を増加させて底刃の切削抵抗よりも大きくすることにより、結果、全体的には上向きの切削抵抗を発生させることが可能となる。そこで、この現象を利用して、薄板状被加工物の板厚方向の加工時の切削抵抗をゼロにして、びびり振動の発生を抑制しようとするのが本発明の基本的な問題解決の原理であり、また、この原理に基づきびびり振動が発生しない加工（切削）条件を予め把握して実際の量産加工すなわち本加工に適用する点が本発明の最大の特徴といえる。 That is, in a milling tool, particularly an end mill tool, it is possible to generate a cutting force in a larger upward direction by increasing the helix angle. Furthermore, by increasing the amount of cut in the axial direction of this end mill tool, the ratio of the cutting amount of the side blades is increased to be larger than the cutting force of the bottom blade, resulting in an overall upward cutting resistance. Can be generated. Therefore, by utilizing this phenomenon, the basic principle of solving the problem of the present invention is to suppress the occurrence of chatter vibration by making the cutting resistance during machining in the thickness direction of the thin plate workpiece zero. In addition, it can be said that the greatest feature of the present invention is that a machining (cutting) condition in which chatter vibration does not occur based on this principle is grasped in advance and applied to actual mass production machining, that is, actual machining.
以下、本発明の実施形態について図３に示すフローチャートに従って以下、具体的に説明する。 Hereinafter, the embodiment of the present invention will be specifically described with reference to the flowchart shown in FIG.
（１）初期条件の設定
まず、フライス工具による量産加工に先立ち、試験的に平面加工（テスト加工）を行なうが、このテスト加工の対象となる薄板状被加工物の形状、材質や使用する工具の種類などに応じて適宜切削条件を決定する。この際の条件として、前述の如く、びびり振動の発生、またその抑制に関連、影響の深い（Ａ）工具軸方向切込み量と（Ｂ）工具ねじれ角以外の他の条件は、原則的には後の本加工（量産加工）の条件としても同様に選択、採用する固定的条件である。
しかし、（Ａ）（Ｂ）の条件は、テスト加工時のびびり振動の発生有無によって本加工時の条件として適切どうかを見極め、通常は本加工時にこれを変更、調整して選択、採用することを前提とした、あくまでも初期条件として位置づけられるものである。
この工具軸方向切込み量と工具ねじれ角の初期条件は、下記の考え方に基づいて設定する。
すなわち、軸方向の切り込み量は加工効率からできるだけ大きい値に設定することが好ましい。ただし、仕上げ加工に近い加工では、所定の加工量に固定されるため比較的小さい値とする。
また、ねじれ角は一般的に準備（使用）することが容易な工具の角度である30度程度を初期条件に設定することが望ましい。
(1) Setting of initial conditions First, prior to mass production processing with a milling tool, plane processing (test processing) is experimentally performed. The shape, material, and tool to be used of the thin plate workpiece to be subjected to this test processing The cutting conditions are appropriately determined according to the type of the material. As described above, as described above, in principle, the conditions other than (A) the cutting depth in the tool axial direction and (B) the tool helix angle, which are deeply related to the occurrence and suppression of chatter vibration, are basically It is a fixed condition that is selected and adopted in the same manner as the conditions for subsequent main processing (mass production processing).
However, the conditions of (A) and (B) are determined as appropriate for the main machining depending on the occurrence of chatter vibration during the test machining. It is positioned as an initial condition to the last.
The initial conditions for the cutting amount in the tool axis direction and the tool twist angle are set based on the following concept.
That is, it is preferable to set the cutting amount in the axial direction as large as possible from the machining efficiency. However, in processing close to finishing, the value is set to a relatively small value because it is fixed at a predetermined processing amount.
In addition, it is desirable to set the twist angle as an initial condition of about 30 degrees, which is a tool angle that is generally easy to prepare (use).
（２）平面加工の実施
上記工具軸方向切込み量と工具ねじれ角の初期条件及び径方向切込み量、工具回転数及び送り速度などの他の切削加工条件を決定した後、量産加工の対象となる薄板状被加工物をサンプルとして平面加工を実施する。
(2) Implementation of plane machining After determining the initial conditions of the above-mentioned tool axis direction cutting depth and tool helix angle, and other cutting conditions such as the radial cutting depth, tool rotation speed, and feed rate, it is the target of mass production machining. Planar processing is performed using a thin plate workpiece as a sample.
（３）板の変位の測定
上記平面加工を実施の際に、加工に伴って生じる板（薄板状被加工物）の板厚方向での変位（変位量及び方向）を変位計によって測定する。
板厚方向の変位の測定については、マイクロメータの他、渦電流変位計やレーザ変位計等の非接触変位計を用いてもよい。また、測定位置は最も変位が大きくなる部位を測定することが望ましい。例えば、図４のように片持ちで被加工物を保持する場合は保持部と反対の端部付近、また図５のように両端支持の場合は被加工物の中央部付近が望ましい。一方、加工中に各種変位計により測定される測定値は、びびり振動成分を含んだ振動波形となることが考えられる。板の切削抵抗による静的変位はこの振動波形の中心値となる。
(3) Measurement of displacement of plate When performing the above-mentioned plane machining, a displacement (displacement amount and direction) in a plate thickness direction of a plate (thin plate-like workpiece) generated in accordance with the machining is measured by a displacement meter.
For the measurement of the displacement in the plate thickness direction, a non-contact displacement meter such as an eddy current displacement meter or a laser displacement meter may be used in addition to the micrometer. Further, it is desirable to measure the position where the displacement is the largest at the measurement position. For example, when the workpiece is held in a cantilever manner as shown in FIG. 4, it is desirable to have the vicinity of the end opposite to the holding portion, and in the case of supporting both ends as shown in FIG. On the other hand, it is conceivable that the measurement values measured by various displacement meters during processing are vibration waveforms including chatter vibration components. The static displacement due to the cutting resistance of the plate becomes the center value of this vibration waveform.
（４）板の変位量の判定
上記テスト加工時の板の変位測定結果に基づいて、先ず板の変位量のデータが十分に小さいかどうかについて判定を行なう。変位量が十分に小さいかどうかについては、この加工時にびびり振動の発生の有無を観測し、これにより判断すればよい。
(4) Determination of displacement amount of plate Based on the displacement measurement result of the plate at the time of the test processing, first, it is determined whether or not the displacement amount data of the plate is sufficiently small. Whether or not the amount of displacement is sufficiently small may be determined by observing the presence or absence of chatter vibration during this processing.
（５）量産加工化
前記の変位量の判定の結果、変位量が十分に小さいと判定できた（Ｙｅｓ）場合には、テスト加工における工具軸方向切込み量と工具ねじれ角の初期条件を変更、調整することなく、他の条件と同様にそのまま量産化加工の条件として選択、採用し、量産加工を行なう。なお、変位量が極めて小さいと判定できた場合には、びびり振動の発生しない範囲で、テスト時の固定的条件である送り速度や径方向切り込み量を増やすことも可能である。
(5) Mass production machining As a result of the determination of the displacement amount, if it is determined that the displacement amount is sufficiently small (Yes), the initial conditions of the tool axis direction cutting amount and the tool helix angle in the test machining are changed, Without adjustment, it is selected and adopted as the conditions for mass production processing as it is for other conditions, and mass production processing is performed. If it is determined that the amount of displacement is extremely small, it is possible to increase the feed rate and the radial cut amount, which are fixed conditions during the test, within a range in which chatter vibration does not occur.
（６）変位の方向の判定
一方、前記変位量の判定の結果、変位量のデータが十分に小さいと判定できない（Ｎｏ）場合は、さらに変位の方向の判定を行ない、この判定結果に基づき、テスト加工時に設定した工具のねじれ角、切込み量の初期条件を以下の通りに調整する。
(6) Determination of displacement direction On the other hand, if the displacement amount data cannot be determined to be sufficiently small as a result of the determination of the displacement amount (No), the displacement direction is further determined. Based on the determination result, Adjust the initial conditions of the tool helix angle and depth of cut set during test machining as follows.
（７）工具のねじれ角、軸方向切込み量の調整
すなわち、変位量データの符号がプラスの場合（すなわち、変位の方向が正方向と判定できた場合（Ｙｅｓの場合））は工具のねじれ角を大きくするもしくは軸方向切込み量を増加させることにより、上向きに切削抵抗を変化させる。また、変位量データの符号がマイナスの場合（すなわち、変位の方向が負方向であり、正方向と判定できない場合（Ｎｏの場合））は逆に工具のねじれ角を小さくする、もしくは切込み量を小さくして下向きに切削抵抗を変化させる。
この場合、ねじれ角と軸方向切込み量の何れを先に調整するか、つまりその優先順位については、基本的には切込み量を優先させて調整し、その後ねじれ角を調整するものとする。これは、ねじれ角の変更は工具の新たな交換を意味するため、作業性が悪いが、これに対して軸方向切込み量は工具の交換の必要が無く作業性が良いためである。しかしながら、加工量（加工代）は予め決まっているため、この軸方向切込みの調整量には自ずと制限があり、この調整だけではびびり振動を十分に抑制できない場合もある。そのときは、工具を交換してねじれ角でも調整すればよい。
(7) the helix angle of the tool, adjust i.e. axial depth of cut, when the sign of the displacement of volume data is positive (i.e., when the case (Yes the direction of displacement could be determined as a positive direction)) is torsion of the tool The cutting force is changed upward by increasing the angle or increasing the axial cutting depth. On the other hand, if the sign of the displacement amount data is negative (that is, if the displacement direction is negative and cannot be determined as positive (in the case of No)) , the tool twist angle is reduced or the depth of cut is reduced. Decrease to change the cutting force downward.
In this case, which of the twist angle and the axial cutting depth is adjusted first, that is, the priority order is basically adjusted by giving priority to the cutting depth, and then the twist angle is adjusted. This is because the change of the twist angle means a new replacement of the tool, so that the workability is poor, whereas the axial cutting depth is good because the tool need not be replaced. However, since the machining amount (machining allowance) is determined in advance, the adjustment amount of this axial cut is naturally limited, and chatter vibration may not be sufficiently suppressed only by this adjustment. In that case, the tool may be changed and the twist angle may be adjusted.
（８）再テスト加工、変位の再判定、加工条件の再調整などの繰り返し実施
上記工具のねじれ角、切込み量の変更、調整した加工条件にて、前記（１） 〜（７）の薄板状被加工物テスト加工、測定及び判定を再び同様に実施し、最終的に薄板状被加工物の変位量が十分に小さいと判定できるまで加工条件の調整を繰り返して行なう。そして、変位量が十分に小さいと判定できた場合のテスト加工時の工具のねじれ角、切込み量の条件を量産加工条件として選択し、これにより本加工実施するものである。
(8) Retesting, re-determination of displacement, re-adjustment of machining conditions, etc. The thin plate shape of (1) to (7) above under the above-mentioned tool twist angle, change of cutting depth, and adjusted machining conditions The workpiece test processing, measurement, and determination are performed again in the same manner, and adjustment of the processing conditions is repeatedly performed until it is finally determined that the displacement amount of the thin plate workpiece is sufficiently small. Then, when it is determined that the amount of displacement is sufficiently small, the conditions of the torsion angle of the tool at the time of test machining and the cutting depth are selected as mass production machining conditions, and this machining is performed.
このように、変位量が十分に小さくなるまでこの平面加工と調整を繰り返せば、びびり振動の発生を抑制した量産加工が可能となり、切削効率に直結する送り速度は十分の大きく設定できることになる。 In this way, if this flattening and adjustment are repeated until the amount of displacement becomes sufficiently small, mass production processing with reduced chatter vibration can be achieved, and the feed rate directly linked to the cutting efficiency can be set sufficiently high.
以下、本発明の優れた効果につき、実施例を挙げて実証する。
（実施例１）
直径６ｍｍの超硬フライス（２枚刃）を用い、薄板状被加工物としてチタン合金（Ｔｉ-６Ａｌ-４Ｖ、板厚５ｍｍ、幅５０ｍｍ、突出し長さ１００ｍｍ、片持ち保持）対象として平面加工（テスト加工）を実施すると共に、図４に示す位置に変位計を取付け、被加工物の板圧方向の変位（変位量とその方向）を測定し、また同時にその際のびびり振動の有無を観測した。
Hereinafter, the excellent effect of the present invention will be demonstrated with examples.
Example 1
Using a carbide milling cutter (2 blades) with a diameter of 6 mm, as a thin plate workpiece, flat machining (Ti-6Al-4V, plate thickness 5 mm, width 50 mm, protrusion length 100 mm, cantilever holding) 4) Attach a displacement meter at the position shown in Fig. 4 and measure the displacement (displacement amount and direction) of the workpiece in the plate pressure direction. At the same time, observe the presence or absence of chatter vibration. did.
切削条件としては、径方向切込み４ｍｍ、工具回転数２５００ｒｐｍ、送り速度０.１ｍｍ／刃とし、工具ねじれ角４５°、軸方向切込み０.２５mmを初期条件として設定した。
そして、この１回目のテスト結果でびびり振動が発生した場合は、測定された変位データにより、前述の図３のフローチャートの要領に従って、切削条件を変更、調整し、２回目、３回目のテスト加工を行なった。表１にこれら１〜３回の平面加工におけるねじれ角度、軸方向の切込み量の条件、変位量（プラスは変位の方向が正、マイナスは同方向が負であることを示す）、びびり振動の発生有無の結果を示す。
As cutting conditions, the radial cutting depth was 4 mm, the tool rotation speed was 2500 rpm, the feed rate was 0.1 mm / blade, the tool helix angle was 45 °, and the axial cutting depth was 0.25 mm.
If chatter vibrations occur in the first test result, the cutting conditions are changed and adjusted according to the procedure of the flowchart of FIG. 3 based on the measured displacement data, and the second and third test processings are performed. Was done. Table 1 shows the torsion angle, axial cutting depth, displacement amount (plus indicates that the direction of displacement is positive, minus indicates that the same direction is negative), chatter vibration, Indicates the result of occurrence.
表１の通り、３回のテスト加工、調整の結果、被加工物の板厚方向の変位量が、１回目の初期条件のときの０.０６ｍｍからその１／６の−０.０１ｍｍまで減少し、びびり振動の発生がなくなったため、この時のねじれ角度、軸方向の切込み量を量産加工の切削加工条件として選択、採用すれば量産加工時においてもびびり振動が有効に抑制できることが分かる。 As shown in Table 1, as a result of three times of test processing and adjustment, the displacement amount of the workpiece in the thickness direction decreased from 0.06 mm at the first initial condition to 1/6 of −1 mm. Since chatter vibration is eliminated, it can be seen that chatter vibration can be effectively suppressed even during mass production if the twist angle and the amount of cut in the axial direction at this time are selected and adopted as cutting conditions for mass production.
（実施例２）
本実施例は１回目のテスト加工における切削条件としてねじれ角６０度、軸方向切込み０.７５ｍｍから開始したもので、他の条件などは上記実施例１と同様に行なった例である。表２この結果を示す。
表２のように、この実施例においても、３回のテスト加工、調整により１回目の初期条件のときの−０.５２ｍｍから０.０１ｍｍまで著しく減少し、びびり振動の発生がなくなったため、この時のねじれ角度、軸方向の切込み量を量産加工時の条件として選択、採用すればびびり振動が有効に抑制できることが分かる。
(Example 2)
In this example, the cutting conditions in the first test machining were started from a twist angle of 60 degrees and an axial depth of cut of 0.75 mm. Other conditions were the same as those in Example 1 above. Table 2 shows the results.
As shown in Table 2, also in this example, the test process and adjustment three times significantly decreased from −0.52 mm to 0.01 mm at the initial initial condition, and chatter vibration was not generated. It can be seen that chatter vibration can be effectively suppressed by selecting and employing the twist angle at the time and the amount of cut in the axial direction as the conditions for mass production.
これら、実施例の結果から明らかなように、薄板状被加工物のエンドミル切削加工に際して、数回のテスト加工、調整を事前に行なう比較的容易な方法により、量産加工時のびびり振動を抑制できる適切な工具軸方向切込み量及び工具ねじれ角の条件を的確に把握することができ、これにより、送り速度を高めることが可能となり、効率的に量産加工を実施することができる。特に剛性の低い薄板材を対象とした場合にはびびり振動が発生し易いため、この種被加工物の生産性の向上に本発明は有用な方法である。 As is clear from the results of these examples, chatter vibration during mass production processing can be suppressed by a relatively easy method in which test processing and adjustment are performed several times in advance during end mill cutting of a thin plate workpiece. It is possible to accurately grasp the conditions of the appropriate cutting amount in the tool axis direction and the tool helix angle, thereby making it possible to increase the feed rate and efficiently carry out mass production processing. Since chatter vibration is likely to occur particularly when a thin plate material with low rigidity is targeted, the present invention is a useful method for improving the productivity of this kind of workpiece.
なお、実施例においては、作業性の観点からいずれも切込み量を調整しているが、これに限らずねじれ角を調整してもよく、更に切込み量とねじれ角の両方を一度に調整することもかまわないものである。 In the embodiment, the cutting depth is adjusted from the viewpoint of workability. However, the present invention is not limited to this, and the twist angle may be adjusted, and both the cutting depth and the twist angle are adjusted at once. It does not matter.
Claims (1)
（１）工具軸方向切込み量及び工具ねじれ角の初期条件を設定し、
（２）該初期条件にて前記薄板状被加工物のテスト加工を実施し、
（３）該テスト加工時における前記薄板状被加工物の変位を測定し、
（４）該変位量が十分に小さいかどうかを判定し、
（５）該変位量が十分に小さいと判定できた場合は、前記テスト加工時の初期条件を量産 加工条件として選択し、
（６）一方、前記変位量が十分に小さいと判定できなかった場合は、更に前記薄板状被加 工物の変位の方向が正方向であるかどうかを判定し、
（７）該変位の方向が正方向と判定できた場合は、前記初期条件における工具軸方向切込 み量または工具ねじれ角を増加させる調整を行ない、また、該変位の方向が正方向 と判定できない場合は、前記初期条件における工具軸方向切込み量または工具ねじ れ角を減少させる調整を行ない、
（８）これら調整後の加工条件にて上記（２）〜（７）の前記薄板状被加工物のテスト加 工、測定及び判定を同様に実施し、薄板状被加工物の変位量が十分に小さいと判定 できるまで加工条件の調整を繰り返して行なった後、変位量が十分に小さいと判定 できた場合のテスト加工時の加工条件を量産加工条件として選択する、
ことを特徴とする薄板状被加工物のフライス工具による平面加工方法。 When processing a thin plate workpiece with a milling tool,
(1) Set the initial conditions of the cutting depth and tool helix angle in the tool axis direction,
(2) Conduct test processing of the thin plate workpiece under the initial conditions,
(3) measuring the displacement of the thin plate-like workpiece during the test machining;
(4) Determine whether the amount of displacement is sufficiently small,
(5) If it can be determined that the amount of displacement is sufficiently small, the initial conditions for the test machining are selected as the mass production machining conditions,
(6) On the other hand, when it cannot be determined that the amount of displacement is sufficiently small, it is further determined whether or not the direction of displacement of the thin plate workpiece is a positive direction,
(7) If the direction of the displacement can be determined as the positive direction, adjustment is made to increase the cutting depth or the tool helix angle in the tool axis direction in the initial condition, and the direction of the displacement is determined as the positive direction. If this is not possible, make adjustments to reduce the cutting depth in the tool axis direction or the tool helix angle in the initial conditions,
(8) Test processing, measurement, and determination of the thin plate workpieces (2) to (7) are performed in the same manner under these adjusted processing conditions, and the displacement of the thin plate workpiece is sufficient. After iteratively adjusting the machining conditions until it can be judged to be small, the machining conditions at the time of test machining when the displacement is judged to be sufficiently small are selected as mass production machining conditions.
A planar processing method using a milling tool for a thin plate workpiece.
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