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JP7625438B2 - Machine tool control device - Google Patents
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JP7625438B2 - Machine tool control device - Google Patents

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JP7625438B2
JP7625438B2 JP2021024544A JP2021024544A JP7625438B2 JP 7625438 B2 JP7625438 B2 JP 7625438B2 JP 2021024544 A JP2021024544 A JP 2021024544A JP 2021024544 A JP2021024544 A JP 2021024544A JP 7625438 B2 JP7625438 B2 JP 7625438B2
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浩平 西村
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本開示は、工作機械に設けられて切削加工の制御を行う制御装置に関する。 This disclosure relates to a control device that is installed in a machine tool and controls cutting processing.

工作機械には、主軸モータと送り軸モータとの負荷を表示部に表示するロードモニタ機能を備えたものがある。ロードモニタ機能により、オペレータは加工により機械にかかる負荷を確認することができるため、切込み量、送り速度、回転速度を調整することにより、過負荷による発熱や機械停止を回避することができる。
また、振動センサで測定したびびり振動の周波数を解析し、周波数と回転速度情報とを用いて、びびり振動が発生しにくい回転速度を演算し表示部に表示する最適回転速度表示機能を備えたものもある（例えば特許文献１参照）。最適回転速度表示機能により、オペレータは経験が浅くてもびびり振動に対する最適な回転速度を知ることができるため、回転速度を調整することにより容易にびびり振動を抑制することができる。 Some machine tools are equipped with a load monitor function that displays the load on the spindle motor and feed axis motor on the display. The load monitor function allows the operator to check the load on the machine during processing, so that by adjusting the cutting depth, feed speed, and rotation speed, heat generation and machine stoppage due to overload can be avoided.
Also, some machines are equipped with an optimum rotation speed display function that analyzes the frequency of chatter vibration measured by a vibration sensor, and calculates a rotation speed at which chatter vibration is unlikely to occur using the frequency and rotation speed information, and displays the calculated rotation speed on a display unit (see, for example, Patent Document 1). The optimum rotation speed display function allows even an inexperienced operator to know the optimum rotation speed for chatter vibration, so that chatter vibration can be easily suppressed by adjusting the rotation speed.

特開２０１２－９１２４９号公報JP 2012-91249 A

最適回転速度表示機能は、びびり振動に対する最適な回転速度を求めることができる。しかしながら、びびり振動に対する最適な切込み量と送り速度とについては求めることができない。
また、びびり振動は、必ずしも加工負荷が大きいほど発生しやすくなるわけではないため、ロードモニタ機能で表示される負荷の値も、びびり振動を抑制するために切込み量、送り速度を調整する際の参考にすることができない。 The optimum rotation speed display function can obtain the optimum rotation speed for reducing chatter vibration, but cannot obtain the optimum cutting depth and feed rate for reducing chatter vibration.
Furthermore, because chatter vibration is not necessarily more likely to occur as the machining load increases, the load value displayed by the load monitor function cannot be used as a reference when adjusting the cutting depth and feed speed to suppress chatter vibration.

そこで、本開示は、びびり振動を効果的に抑制するための切込み量と送り速度とを求めることができる工作機械の制御装置を提供することを目的としたものである。 Therefore, the present disclosure aims to provide a control device for a machine tool that can determine the cutting depth and feed rate to effectively suppress chatter vibration.

上記目的を達成するために、本開示は、工具又はワークを回転させると共に、前記工具を所定の送り方向へ送りながらワークを切削加工する工作機械の制御装置であって、
前記ワークの材質情報と、前記工具に係る形状情報とを少なくとも入力する入力部と、
前記入力部に入力された前記形状情報を用いて、前記ワークへの前記工具の切込み量と前記工具の送り速度とをそれぞれ変化させた際の、切削加工時の一回転前の加工面と重複する切削領域における前記送り方向の幅である再生幅を演算する再生幅演算部と、
前記再生幅演算部で求めた前記再生幅と、前記ワークの材質と前記再生幅を演算した際の前記切込み量及び前記送り速度とによって定まる比切削抵抗とに基づいてびびり振動に対する不安定度を演算する不安定度演算部と、を備えることを特徴とする。
本開示の別の態様は、上記構成において、前記不安定度演算部は、前記不安定度を、前記再生幅と前記比切削抵抗との積又は和によって演算することを特徴とする。
本開示の別の態様は、上記構成において、前記不安定度を、前記切込み量及び前記送り速度との関係と共に表示する表示部を備えることを特徴とする。
本開示の別の態様は、上記構成において、前記表示部は、前記工具の形状情報と前記送り速度とから求める加工面の理論粗さと、前記切込み量と前記送り速度とから求める切削断面積とのうちの少なくとも１つを併せて表示することを特徴とする。
本開示の別の態様は、上記構成において、前記表示部は、前記切込み量及び前記送り速度に対応した前記不安定度と、前記理論粗さと、前記切削断面積とをグラフ化して表示し、前記グラフ上の所定の位置が選択されると、当該位置に対応した前記切込み量及び前記送り速度を加工プログラムに反映させることを特徴とする。
本開示の別の態様は、上記構成において、切削断面積と加工面粗さとの少なくとも一方が入力情報として前記入力部に入力されると、所定の前記不安定度の値以下で、且つ前記入力情報に応じた前記切込み量及び前記送り速度を自動的に加工プログラムに反映させることを特徴とする。
 In order to achieve the above object, the present disclosure provides a control device for a machine tool that cuts a workpiece while rotating a tool or a workpiece and feeding the tool in a predetermined feed direction, comprising:
An input unit that inputs at least material information of the workpiece and shape information related to the tool ;
a reproduction width calculation unit that calculates a reproduction width, which is a width in the feed direction in a cutting area that overlaps with a machining surface one rotation before during cutting processing, when a cutting amount of the tool into the workpiece and a feed speed of the tool are changed, using the shape information input to the input unit;
The present invention is characterized by comprising an instability calculation unit that calculates the instability against chatter vibration based on the regeneration width determined by the regeneration width calculation unit and the specific cutting resistance determined by the material of the workpiece and the cutting depth and the feed speed when the regeneration width is calculated.
Another aspect of the present disclosure is characterized in that, in the above configuration, the instability calculation unit calculates the instability by the product or sum of the regeneration width and the specific cutting resistance.
Another aspect of the present disclosure is characterized in that, in the above configuration, a display unit is provided that displays the degree of instability together with a relationship with the cutting depth and the feed speed.
Another aspect of the present disclosure is characterized in that, in the above configuration, the display unit also displays at least one of a theoretical roughness of the machined surface calculated from shape information of the tool and the feed speed, and a cutting cross-sectional area calculated from the cutting depth and the feed speed.
Another aspect of the present disclosure is characterized in that, in the above configuration, the display unit displays the instability corresponding to the cutting depth and the feed rate, the theoretical roughness, and the cutting cross-sectional area in graphs, and when a specified position on the graph is selected, the cutting depth and the feed rate corresponding to that position are reflected in the machining program.
Another aspect of the present disclosure is characterized in that, in the above configuration, when at least one of the cutting cross-sectional area and the machined surface roughness is input to the input section as input information, the cutting depth and the feed rate are automatically reflected in the machining program so as to be equal to or less than a predetermined instability value and in accordance with the input information.

本開示によれば、工具の切込み量及び送り速度からびびり振動に対する不安定度が演算されるので、得られた不安定度に基づいてびびり振動を効果的に抑制するための切込み量及び送り速度を選択することができる。
特に、不安定度を、再生幅と比切削抵抗との積又は和によって演算する別の態様によれば、不安定度が簡単に得られる。
不安定度を、切込み量及び送り速度との関係と共に表示する表示部を備える別の態様によれば、上記効果に加えて、オペレータは、不安定度が低い切込み量と送り速度とを容易に最適値に調整することができ、容易にびびり振動を抑制することができる。
表示部が、工具の形状情報と送り速度とから求める加工面の理論粗さと、切込み量と送り速度とから求める切削断面積とを併せて表示する別の態様によれば、上記効果に加えて、切込み量及び送り速度を変更した後の理論粗さと切削断面積とがわかりやすくなる。よって、品質と加工能率の維持および改善も行いやすくなる。
表示部が、切込み量及び送り速度に対応した不安定度と、理論粗さと、切削断面積とをグラフ化して表示し、グラフ上の所定の位置が選択されると、当該位置に対応した切込み量及び送り速度を加工プログラムに反映させる別の態様によれば、上記効果に加えて、びびり振動が発生しにくい切込み量と送り速度との選択が容易に行える。
切削断面積と加工面粗さとの少なくとも一方が入力情報として入力部に入力されると、所定の不安定度の値以下で、且つ入力情報に応じた切込み量及び送り速度を自動的に加工プログラムに反映させる別の態様によれば、上記効果に加えて、びびり振動が発生しにくい切込み量と送り速度とで自動的に切削加工が行われ、加工能率が向上すると共に、オペレータの入力作業も軽減される。 According to the present disclosure, the degree of instability with respect to chatter vibration is calculated from the cutting depth and feed speed of the tool, so that the cutting depth and feed speed for effectively suppressing chatter vibration can be selected based on the obtained degree of instability.
In particular, according to another embodiment in which the instability is calculated by the product or sum of the regeneration width and the specific cutting resistance, the instability can be easily obtained.
According to another aspect having a display unit that displays the degree of instability together with the relationship between the depth of cut and the feed rate, in addition to the above effects, the operator can easily adjust the depth of cut and the feed rate, which have low instability, to optimal values, and can easily suppress chatter vibration.
According to another aspect in which the display unit displays the theoretical roughness of the machined surface calculated from the tool shape information and the feed rate, and the cutting cross-sectional area calculated from the cutting depth and the feed rate, in addition to the above effects, the theoretical roughness and the cutting cross-sectional area after changing the cutting depth and the feed rate can be easily understood, which makes it easier to maintain and improve quality and processing efficiency.
According to another aspect in which the display unit displays the instability, theoretical roughness, and cutting cross-sectional area corresponding to the cutting depth and feed rate in a graph, and when a specific position on the graph is selected, the cutting depth and feed rate corresponding to that position are reflected in the machining program, in addition to the above effects, it is possible to easily select the cutting depth and feed rate that are less likely to cause chatter vibration.
According to another aspect in which, when at least one of the cutting cross-sectional area and the machined surface roughness is input to the input section as input information, a cutting depth and feed rate that are equal to or less than a predetermined instability value and correspond to the input information are automatically reflected in the machining program, in addition to the above effects, cutting is automatically performed with a cutting depth and feed rate that are unlikely to cause chatter vibration, improving machining efficiency and reducing the input work of the operator.

旋盤における外周切削の模式図である。FIG. 1 is a schematic diagram of peripheral cutting on a lathe. 背分力方向の比切削抵抗と切込み量と送り速度との関係を表す模式図である。FIG. 1 is a schematic diagram showing the relationship between the specific cutting resistance in the thrust force direction, the cutting depth, and the feed rate. 再生幅と切込み量と送り速度との関係を表す模式図である。FIG. 4 is a schematic diagram showing the relationship between the reproducing width, the cutting depth, and the feed speed. 制御装置のブロック構成図である。FIG. 2 is a block diagram of a control device. 不安定度演算部が演算したびびり振動に対する不安定度の表示の模式図である。10 is a schematic diagram showing the instability of chatter vibration calculated by an instability calculation unit. FIG.

以下、本開示の実施の形態を図面に基づいて説明する。
図１は、工作機械の一例である旋盤Ｍにおける外周切削の模式図である。ここでは、周知の機械構成によって、回転するワーク１に工具２を主軸の径方向に切り込み、主軸方向に送ることでワーク１の外径を円筒形状に加工する様子を表している。
図１において、ａは切込み量、ｆは送り速度、Ｒは工具２のノーズ、ｂは切削幅、ｂｄは再生幅（一回転前の加工面と重複する切削領域）である。図１に示すように、再生幅ｂｄは、切込み量ａ、送り速度ｆ、ノーズＲを用いて幾何学的に求めることができる。
図２は、背分力方向（ワーク１の半径方向）の比切削抵抗Ｋｒと、切込み量ａと、送り速度ｆとの関係を表す模式図である。図２に示すように、比切削抵抗Ｋｒは、切込み量ａが小さいほど、また、送り速度ｆが小さいほど大きくなる。
図３は、再生幅ｂｄと、切込み量ａと、送り速度ｆとの関係を表す模式図である。なお、ノーズＲは、工具２の諸元の一つであり、オペレータが加工条件を調整する際には既知であるためここでは変数としない。図３に示すように、再生幅ｂｄは、切込み量ａが大きいほど大きくなり、送り速度ｆが小さいほど大きくなる。 Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.
1 is a schematic diagram of peripheral cutting in a lathe M, which is an example of a machine tool. This shows how a tool 2 cuts into a rotating workpiece 1 in the radial direction of a spindle and feeds it in the spindle direction to machine the outer diameter of the workpiece 1 into a cylindrical shape, using a known machine configuration.
In Fig. 1, a is the cutting depth, f is the feed rate, R is the nose of the tool 2, b is the cutting width, and bd are the regeneration widths (cutting areas overlapping with the machined surface one rotation before). As shown in Fig. 1, the regeneration widths bd can be geometrically calculated using the cutting depth a, the feed rate f, and the nose R.
2 is a schematic diagram showing the relationship between the specific cutting resistance Kr in the thrust force direction (radial direction of the workpiece 1), the cutting depth a, and the feed rate f. As shown in FIG. 2, the specific cutting resistance Kr increases as the cutting depth a decreases and as the feed rate f decreases.
Fig. 3 is a schematic diagram showing the relationship between the regeneration width bd , the cutting depth a, and the feed rate f. The nose radius R is one of the parameters of the tool 2, and is known when the operator adjusts the machining conditions, so it is not considered a variable here. As shown in Fig. 3, the regeneration width bd increases as the cutting depth a increases, and increases as the feed rate f decreases.

図４は、本開示の制御装置１０の構成の一例を示す。ここでの制御装置１０は、旋盤ＭのＮＣ装置に構成される。制御装置１０は、記憶部３と、入力部４と、再生幅演算部５と、不安定度演算部６と、表示部７とを備えている。
記憶部３には、入力部４からオペレータが入力するワーク１の材質情報と、ノーズＲなどの工具形状情報と、図２に示すような、予め実験等で求めた比切削抵抗Ｋｒと、切込み量ａと、送り速度ｆとの関係とが保管されている。
再生幅演算部５は、記憶部３に保管された情報を読み込み、工具形状を基にした再生幅ｂｄの演算を行い、図３に示すような、再生幅ｂｄと、切込み量ａと、送り速度ｆとの関係を演算する。
不安定度演算部６は、これから加工を行うワーク１の材質に対応した比切削抵抗Ｋｒと、再生幅演算部５が演算した再生幅ｂｄとを乗算したものを、びびり振動に対する不安定度として算出する。 4 shows an example of the configuration of the control device 10 of the present disclosure. The control device 10 here is configured in an NC device of a lathe M. The control device 10 includes a storage unit 3, an input unit 4, a playback width calculation unit 5, an instability calculation unit 6, and a display unit 7.
The memory unit 3 stores information on the material of the workpiece 1 input by an operator via the input unit 4, information on the tool shape such as the nose R, and the relationship between the specific cutting resistance Kr , the cutting depth a, and the feed rate f, which has been obtained in advance by an experiment or the like, as shown in FIG.
The reproduction width calculation unit 5 reads the information stored in the memory unit 3, calculates the reproduction width b- d based on the tool shape, and calculates the relationship between the reproduction width b- d , the cutting depth a, and the feed speed f as shown in Figure 3.
The instability calculation unit 6 multiplies the specific cutting resistance Kr corresponding to the material of the workpiece 1 to be machined by the regeneration width bd calculated by the regeneration width calculation unit 5, and calculates the instability with respect to chatter vibration.

図５は、不安定度演算部６が演算したびびり振動に対する不安定度の表示の模式図であり、横軸に切込み量ａをとり、縦軸の第１軸に送り速度ｆをとり、縦軸の第２軸にノーズＲと送り速度ｆから求める加工面の理論粗さをとり、比切削抵抗Ｋｒと再生幅ｂｄとの積を不安定度としてカラーマップで示す。また、切込み量ａと送り速度ｆとから求める切削断面積を等高線を用いて示す。不安定度のカラーマップは、色が濃くなるに連れて大きくなり、上限が最大、下限が０であることを示している。表示部７は、図５に示すようなグラフ表示を行う。
よって、オペレータは、表示部７に表示される不安定度に基づいて、適切な切込み量ａと送り速度ｆとを、グラフ上で位置を選択するか、或いは数値を直接入力するかすることで入力部４から入力する。すると、制御装置１０は、入力された切込み量ａと送り速度ｆとを加工プログラムに反映して加工を行う。 Fig. 5 is a schematic diagram showing the degree of instability for chatter vibration calculated by the instability calculation unit 6, with the cutting depth a on the horizontal axis, the feed rate f on the first vertical axis, and the theoretical roughness of the machined surface calculated from the nose R and the feed rate f on the second vertical axis, and the product of the specific cutting resistance Kr and the regeneration width bd is shown as the degree of instability in a color map. Also, the cutting cross-sectional area calculated from the cutting depth a and the feed rate f is shown using contour lines. The color map of instability increases as the color becomes darker, indicating that the upper limit is maximum and the lower limit is 0. The display unit 7 displays a graph as shown in Fig. 5.
Therefore, the operator inputs an appropriate cutting depth a and feed rate f from the input unit 4 by selecting a position on the graph or by directly inputting numerical values based on the instability displayed on the display unit 7. Then, the control device 10 reflects the input cutting depth a and feed rate f in the machining program and performs machining.

以上のように、上記形態の旋盤Ｍの制御装置１０は、工具２に係る情報を入力する入力部４と、入力部４に入力された情報を用いて、切削加工時の一回転前の加工面と重複する切削領域である再生幅ｂｄと、ワーク１への工具２の切込み量ａと、工具２の送り速度ｆとの関係を演算する再生幅演算部５と、再生幅演算部５で求めた再生幅ｂｄと比切削抵抗Ｋｒとに基づいてびびり振動に対する不安定度を演算する不安定度演算部６と、を備えている。
この構成によれば、工具２の切込み量ａ及び送り速度ｆからびびり振動に対する不安定度が演算されるので、得られた不安定度に基づいてびびり振動を効果的に抑制するための切込み量ａ及び送り速度ｆを選択することができる。 As described above, the control device 10 of the lathe M in the above-mentioned form comprises an input unit 4 for inputting information related to the tool 2, a reproduction width calculation unit 5 for using the information input to the input unit 4 to calculate the relationship between the regeneration width bd , which is a cutting area that overlaps with the machining surface one rotation before during cutting, the cutting depth a of the tool 2 into the workpiece 1, and the feed speed f of the tool 2, and an instability calculation unit 6 for calculating the instability with respect to chatter vibration based on the regeneration width bd and the specific cutting resistance Kr determined by the reproduction width calculation unit 5.
According to this configuration, the degree of instability with respect to chatter vibration is calculated from the cutting depth a and feed speed f of the tool 2, so that the cutting depth a and feed speed f for effectively suppressing chatter vibration can be selected based on the obtained degree of instability.

特に、不安定度を、切込み量ａ及び送り速度ｆとの関係と共に表示する表示部７を備えるので、オペレータは、不安定度が低い（びびり振動が発生しにくい）切込み量ａと送り速度ｆとを容易に最適値に調整することができ、容易にびびり振動を抑制することができる。
また、表示部７が、工具２の形状情報と送り速度ｆとから求める加工面の理論粗さと、切込み量ａと送り速度ｆとから求める切削断面積とを併せて表示するので、切込み量ａ及び送り速度ｆを変更した後の理論粗さと切削断面積とがわかりやすくなる。よって、品質と加工能率の維持および改善も行いやすくなる。
さらに、表示部７は、切込み量ａ及び送り速度ｆに対応した不安定度と、理論粗さと、切削断面積とをグラフ化して表示し、グラフ上の所定の位置が選択されると、当該位置に対応した切込み量ａ及び送り速度ｆを加工プログラムに反映させるので、びびり振動が発生しにくい切込み量ａと送り速度ｆとの選択が容易に行える。 In particular, since the display unit 7 displays the degree of instability along with the relationship between the cutting depth a and the feed speed f, the operator can easily adjust the cutting depth a and the feed speed f to optimal values that have low instability (are less likely to cause chatter vibration), and can easily suppress chatter vibration.
In addition, the display unit 7 displays the theoretical roughness of the machined surface calculated from the shape information of the tool 2 and the feed rate f, and the cutting cross-sectional area calculated from the cutting depth a and the feed rate f, so that the theoretical roughness and cutting cross-sectional area after changing the cutting depth a and the feed rate f can be easily seen. This makes it easier to maintain and improve quality and processing efficiency.
Furthermore, the display unit 7 displays the instability, theoretical roughness, and cutting cross-sectional area corresponding to the cutting depth a and feed rate f in a graph. When a specific position on the graph is selected, the cutting depth a and feed rate f corresponding to that position are reflected in the machining program, making it easy to select the cutting depth a and feed rate f that are less likely to cause chatter vibration.

以下、本開示の変更例について説明する。
上記形態では、再生幅と比切削抵抗との積を不安定度としているが、再生幅と比切削抵抗との和を不安定度としてもよい。このように再生幅と比切削抵抗との積又は和によって求めれば、不安定度が簡単に得られる。但し、不安定度は、再生幅と比切削抵抗とを含む別の計算式により演算してもよい。
上記形態では、表示部に、加工面の理論粗さと切削断面積との双方を表示しているが、何れか一方のみでもよいし、双方を表示しなくてもよい。不安定度は、切込み量及び送り速度と共に表示せず、不安定度のみを表示してもよい。
表示部でのグラフ表示において、カラーマップの範囲（上限と下限）は、任意に設定可能である。色も、マス目による段階的な表示に限らず、グラデーションのように連続的に変化させてもよい。勿論上記形態以外のグラフ形式も採用できる。 Modifications of the present disclosure will be described below.
In the above embodiment, the instability is the product of the reclaimed width and the specific cutting resistance, but the sum of the reclaimed width and the specific cutting resistance may be used as the instability. In this way, the instability can be easily obtained by calculating the product or sum of the reclaimed width and the specific cutting resistance. However, the instability may be calculated by another calculation formula including the reclaimed width and the specific cutting resistance.
In the above embodiment, both the theoretical roughness and the cutting cross-sectional area of the machined surface are displayed on the display unit, but only one of them or neither may be displayed. The instability may be displayed alone without being displayed together with the cutting depth and the feed rate.
In the graph display on the display unit, the range of the color map (upper and lower limits) can be set arbitrarily. The color is not limited to a stepped display using squares, and may be changed continuously like a gradation. Of course, graph formats other than the above can also be adopted.

上記形態では、表示部に表示したグラフ上でオペレータが切込み量及び送り速度を選択することで加工プログラムに反映される構成となっているが、オペレータによる設定を契機とするものに限らず、加工負荷等により決まる切削断面積と、必要な加工面粗さとの少なくとも一方を入力部に入力すると、所定の不安定度の値以下で、且つ当該入力情報に応じた切込み量と送り速度とを自動的に決定して加工プログラムに反映させるようにしてもよい。このようにすれば、びびり振動が発生しにくい切込み量と送り速度とで自動的に切削加工が行われ、加工能率が向上すると共に、オペレータの入力作業も軽減される。
その他、本発明は、旋盤以外の工作機械にも適用可能である。 In the above embodiment, the cutting depth and feed rate are selected by the operator on the graph displayed on the display unit, and are reflected in the machining program, but it is not limited to being triggered by the operator's setting, and when at least one of the cutting cross-sectional area determined by the machining load and the required machined surface roughness is input into the input unit, the cutting depth and feed rate that are equal to or less than a predetermined instability value and correspond to the input information may be automatically determined and reflected in the machining program. In this way, cutting is automatically performed with the cutting depth and feed rate that are unlikely to cause chatter vibration, improving machining efficiency and reducing the input work of the operator.
The present invention is also applicable to machine tools other than lathes.

１・・ワーク、２・・工具、３・・記憶部、４・・入力部、５・・再生幅演算部、６・・不安定度演算部、７・・表示部、Ｍ・・旋盤、ａ・・切込み量、ｆ・・送り速度、Ｒ・・ノーズ、ｂ・・切削幅、ｂｄ・・再生幅、Ｋｒ・・比切削抵抗。 1: Workpiece, 2: Tool, 3: Memory unit, 4: Input unit, 5: Regenerated width calculation unit, 6: Instability calculation unit, 7: Display unit, M: Lathe, a: Depth of cut, f: Feed speed, R: Nose, b: Cutting width, bd : Regenerated width, Kr : Specific cutting resistance.

Claims (6)

工具又はワークを回転させると共に、前記工具を所定の送り方向へ送りながらワークを切削加工する工作機械の制御装置であって、
前記ワークの材質情報と、前記工具に係る形状情報とを少なくとも入力する入力部と、
前記入力部に入力された前記形状情報を用いて、前記ワークへの前記工具の切込み量と前記工具の送り速度とをそれぞれ変化させた際の、切削加工時の一回転前の加工面と重複する切削領域における前記送り方向の幅である再生幅を演算する再生幅演算部と、
前記再生幅演算部で求めた前記再生幅と、前記ワークの材質と前記再生幅を演算した際の前記切込み量及び前記送り速度とによって定まる比切削抵抗とに基づいてびびり振動に対する不安定度を演算する不安定度演算部と、
を備えることを特徴とする工作機械の制御装置。 A control device for a machine tool that cuts a workpiece while rotating a tool or a workpiece and feeding the tool in a predetermined feed direction, comprising:
An input unit that inputs at least material information of the workpiece and shape information related to the tool ;
a reproduction width calculation unit that calculates a reproduction width, which is a width in the feed direction in a cutting area that overlaps with a machining surface one rotation before during cutting processing, when a cutting amount of the tool into the workpiece and a feed speed of the tool are changed, using the shape information input to the input unit;
An instability calculation unit that calculates an instability against chatter vibration based on the regeneration width calculated by the regeneration width calculation unit , the material of the workpiece, and a specific cutting resistance determined by the cutting depth and the feed rate when the regeneration width is calculated ;
A control device for a machine tool comprising: 前記不安定度演算部は、前記不安定度を、前記再生幅と前記比切削抵抗との積又は和によって演算することを特徴とする請求項１に記載の工作機械の制御装置。 The control device for a machine tool according to claim 1, characterized in that the instability calculation unit calculates the instability by the product or sum of the regeneration width and the specific cutting resistance. 前記不安定度を、前記切込み量及び前記送り速度との関係と共に表示する表示部を備えることを特徴とする請求項１又は２に記載の工作機械の制御装置。 The control device for a machine tool according to claim 1 or 2, characterized in that it is provided with a display unit that displays the instability together with the relationship between the cutting depth and the feed rate. 前記表示部は、前記工具の形状情報と前記送り速度とから求める加工面の理論粗さと、前記切込み量と前記送り速度とから求める切削断面積とのうちの少なくとも１つを併せて表示することを特徴とする請求項３に記載の工作機械の制御装置。 The control device for a machine tool according to claim 3, characterized in that the display unit also displays at least one of the theoretical roughness of the machined surface calculated from the shape information of the tool and the feed rate, and the cutting cross-sectional area calculated from the cutting depth and the feed rate. 前記表示部は、前記切込み量及び前記送り速度に対応した前記不安定度と、前記理論粗さと、前記切削断面積とをグラフ化して表示し、前記グラフ上の所定の位置が選択されると、当該位置に対応した前記切込み量及び前記送り速度を加工プログラムに反映させることを特徴とする請求項４に記載の工作機械の制御装置。 The control device for a machine tool according to claim 4, characterized in that the display unit displays the degree of instability corresponding to the cutting depth and the feed rate, the theoretical roughness, and the cutting cross-sectional area in a graph, and when a specific position on the graph is selected, the cutting depth and the feed rate corresponding to that position are reflected in the machining program. 切削断面積と加工面粗さとの少なくとも一方が入力情報として前記入力部に入力されると、所定の前記不安定度の値以下で、且つ前記入力情報に応じた前記切込み量及び前記送り速度を自動的に加工プログラムに反映させることを特徴とする請求項１又は２に記載の工作機械の制御装置。 The control device for a machine tool according to claim 1 or 2, characterized in that when at least one of the cutting cross-sectional area and the machined surface roughness is input to the input section as input information, the cutting depth and the feed rate are automatically reflected in the machining program so as to be equal to or less than a predetermined instability value and in accordance with the input information.
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