JP2011230217A - Tool chatter prevention device - Google Patents
Tool chatter prevention device Download PDFInfo
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- JP2011230217A JP2011230217A JP2010102023A JP2010102023A JP2011230217A JP 2011230217 A JP2011230217 A JP 2011230217A JP 2010102023 A JP2010102023 A JP 2010102023A JP 2010102023 A JP2010102023 A JP 2010102023A JP 2011230217 A JP2011230217 A JP 2011230217A
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- tool
- contact member
- pressing force
- contact
- prevention device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0032—Arrangements for preventing or isolating vibrations in parts of the machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/04—Tool holders for a single cutting tool
- B23B29/12—Special arrangements on tool holders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2250/00—Compensating adverse effects during turning, boring or drilling
- B23B2250/16—Damping of vibrations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
Description
この発明は、工作機械において、工具に発生するびびり振動を抑えるために使用される工具のびびり防止装置に関する。 The present invention relates to a chatter preventing device for a tool used for suppressing chatter vibration generated in a tool in a machine tool.
旋盤等に用いられる切削工具の一つとして、ボーリングバーと呼ばれる内径加工用のものがある。このボーリングバーは、工具ホルダ等の工具支持体からオーバーハングさせた片持ち梁形状で使用されるため、切削条件によってはびびり振動と呼ばれる振動が発生し易く、加工精度が低下するという問題がある。 One of cutting tools used for lathes and the like is a boring bar called an inner diameter machining tool. Since this boring bar is used in the shape of a cantilever beam that is overhanged from a tool support such as a tool holder, vibration called chatter vibration is likely to occur depending on cutting conditions, resulting in a problem of reduced machining accuracy. .
上記びびり振動対策として、摩擦減衰を利用してびびり振動の要因となる振動エネルギーを吸収させる提案がなされている。例えば特許文献１は、工具支持体と切削工具とを連結するボルト部材の内部にフリクションダンパ部を移動自在に設け、このフリクションダンパ部を接触対象であるキャップ部に押付けた構成であって、切削工具の振動に対しフリクションダンパ部が慣性によって異なる位相で振動し、フリクションダンパ部とキャップ部の滑り摩擦により切削工具の振動エネルギーを吸収させる。特許文献１では、磁力でフリクションダンパ部をキャップ部に押付けているが、ばね等による弾性付勢力で押付けても良い。また、特許文献２は、切削工具に弾性体を介してウェイトを装着し、切削工具の振動エネルギーを弾性体内の摩擦減衰により吸収させる。 As a countermeasure against the chatter vibration, a proposal has been made to absorb vibration energy that causes chatter vibration by using friction damping. For example, Patent Document 1 is a configuration in which a friction damper is movably provided inside a bolt member that connects a tool support and a cutting tool, and the friction damper is pressed against a cap that is a contact target. The friction damper part vibrates at a phase different depending on the inertia with respect to the vibration of the tool, and the vibration energy of the cutting tool is absorbed by the sliding friction between the friction damper part and the cap part. In Patent Document 1, the friction damper portion is pressed against the cap portion by magnetic force, but may be pressed by an elastic biasing force such as a spring. In Patent Document 2, a weight is attached to a cutting tool via an elastic body, and the vibration energy of the cutting tool is absorbed by friction damping in the elastic body.
特許文献１のように、フリクションダンパ部の慣性力を利用して摩擦力を発生させるのは、必要な大きさの摩擦力を得るためにフリクションダンパ部の質量をかなり大きくしなければならず、実際の工具支持体や切削工具に組込むのは難しい。また、振動エネルギーの大きさに応じて、フリクションダンパ部をキャップ部に押付ける磁力や弾性付勢力を調整する場合、磁石やばねの部品交換が必要である。そのため、磁力または弾性付勢力の異なる複数の磁石やばねを用意しておかなければならず、しかも微調整が難しい。 As in Patent Document 1, the frictional force is generated by using the inertial force of the friction damper part. In order to obtain the necessary frictional force, the mass of the friction damper part must be considerably increased. It is difficult to incorporate into an actual tool support or cutting tool. Further, when adjusting the magnetic force or the elastic biasing force that presses the friction damper portion against the cap portion according to the magnitude of the vibration energy, it is necessary to replace the magnet and spring parts. Therefore, a plurality of magnets and springs having different magnetic forces or elastic urging forces must be prepared, and fine adjustment is difficult.
特許文献２のように、切削工具自体にびびり振動を防止する防振機構を設けるのは、専用の切削工具となり、切削工具が高価になる。また、市販の切削工具は使用できないので、汎用性が低い。 As in Patent Document 2, providing a vibration-proof mechanism for preventing chatter vibration in the cutting tool itself is a dedicated cutting tool, and the cutting tool becomes expensive. Moreover, since a commercially available cutting tool cannot be used, versatility is low.
この発明の目的は、工具に発生するびびり振動を抑えることができ、びびり振動の要因となる振動エネルギーの大きさに応じた調整が容易で、市販の工具にも適用可能な工具のびびり防止装置を提供することである。
この発明の他の目的は、工具に発生する振動に対して抵抗となる方向の摩擦力を微調整可能にすることである。
この発明のさらに他の目的は、前記摩擦力が作用する方向の剛性が高く、摩擦力に対する抵抗力が強い構造とすることである。
この発明のさらに他の目的は、簡素な構造とすることである。
An object of the present invention is to prevent chatter vibration generated in a tool, easily adjust according to the magnitude of vibration energy that causes chatter vibration, and can be applied to a commercially available tool. Is to provide.
Another object of the present invention is to make it possible to finely adjust the frictional force in the direction of resistance to vibration generated in the tool.
Still another object of the present invention is to provide a structure having high rigidity in the direction in which the frictional force acts and strong resistance to the frictional force.
Still another object of the present invention is to provide a simple structure.
この発明の工具のびびり防止装置は、工作機械に使用される工具のびびり防止装置であって、工具支持体に取付けられこの工具支持体に装着された工具の外周に配置される装置本体と、加工に伴って前記工具に発生する振動に対して抵抗となる方向に摩擦力が生じるように前記工具に接触させられる接触部材と、この接触部材を前記工具に押付け、かつその押付け力を調整可能な押付け力調整機構とを備える。ここで言う「工具支持体」は、工具ホルダまたは刃物台のことである。 The tool chatter preventing device of the present invention is a tool chatter preventing device used for a machine tool, and is an apparatus main body that is attached to a tool support and disposed on the outer periphery of a tool attached to the tool support, A contact member that is brought into contact with the tool so that a frictional force is generated in a direction that resists vibration generated in the tool during processing, and the contact member is pressed against the tool, and the pressing force can be adjusted. And a pressing force adjusting mechanism. The “tool support” here refers to a tool holder or a tool post.
この構成によると、押付け力調整機構により、接触部材が工具に押付けられる。それにより、工具と接触部材間に、加工に伴って工具に発生する振動に対して抵抗となる方向に摩擦力が生じる。この摩擦力による摩擦減衰で、びびり振動の要因となる振動エネルギーが吸収される。接触部材を工具に押付ける押付け力を、適正な摩擦減衰が得られる大きさとなるように押付け力調整機構で調整することにより、振動エネルギーを消滅させてびびり振動を抑制させられる。 According to this configuration, the contact member is pressed against the tool by the pressing force adjusting mechanism. Thereby, a frictional force is generated between the tool and the contact member in a direction that becomes resistance to vibration generated in the tool during processing. The vibrational energy that causes chatter vibration is absorbed by the frictional damping due to this frictional force. By adjusting the pressing force for pressing the contact member against the tool with the pressing force adjusting mechanism so as to obtain an appropriate frictional damping, vibration energy can be eliminated and chatter vibration can be suppressed.
この発明において、前記接触部材における前記工具との接触部が、前記押付け力調整機構により前記工具に押付けられる方向に弾性変形可能であるのが良い。
接触部材の接触部が工具を押付ける方向に弾性変形可能であれば、押付け力調整機構による押付け力の大きさにおける広い範囲で摩擦力を発生させることができる。つまり、押付け力の大きさの変化に比べて摩擦力の大きさの変化が小さい。よって、押付け力の変更による摩擦力の微調整がし易い。但し、弾性変形し易すぎると、押付け力を付与しても摩擦力が発生しないので、接触部が適度に弾性変形するように設定する。
In this invention, it is good that the contact part with the said tool in the said contact member can be elastically deformed in the direction pressed against the said tool by the said pressing force adjustment mechanism.
If the contact portion of the contact member can be elastically deformed in the direction in which the tool is pressed, the frictional force can be generated in a wide range of the pressing force by the pressing force adjusting mechanism. That is, the change in the magnitude of the frictional force is smaller than the change in the magnitude of the pressing force. Therefore, it is easy to finely adjust the frictional force by changing the pressing force. However, if the elastic deformation is too easy, a frictional force is not generated even if a pressing force is applied, so that the contact portion is set to be elastically deformed appropriately.
例えば、前記接触部材は、前記接触部とこの接触部を支持する主部とを有し、前記接触部は前記主部に対し、前記摩擦力の作用する方向に延びるスリットを介して、前記工具に押付けられる方向に隔てられ、前記スリットの端の連結部で前記主部に連結された形状とすることができる。
接触部材が上記形状であると、接触部は摩擦力の作用する方向の厚みが薄いため、摩擦力の作用する方向と交差する方向の剛性が低く、押付け力調整機構による押付け力で適度の弾性変形を生じさせることができる。一方、接触部は摩擦力の作用する方向には長いため、同方向の剛性は高く、摩擦力に対する抵抗力が強い。
For example, the contact member includes the contact portion and a main portion that supports the contact portion, and the contact portion is formed on the tool via a slit that extends in a direction in which the frictional force acts on the main portion. It can be made into the shape connected to the said main part by the connection part of the edge of the said slit, spaced apart in the direction pressed by.
When the contact member has the above shape, the thickness of the contact portion in the direction in which the friction force acts is thin, so the rigidity in the direction intersecting the direction in which the friction force acts is low, and moderate elasticity is achieved by the pressing force by the pressing force adjusting mechanism. Deformation can occur. On the other hand, since the contact portion is long in the direction in which the frictional force acts, the rigidity in the same direction is high and the resistance to the frictional force is strong.
この発明において、前記押付け力調整機構は、前記接触部材を前記工具に押付ける力を調整する機能と、前記接触部材を前記装置本体に取付ける機能とを有するのが良い。
押付け力調整機構に接触部材を装置本体に取付ける機能を持たせることにより、接触部材を装置本体に取付けるための部材を別に設ける必要がなく、びびり防止装置の構成を簡素にできる。
In this invention, it is preferable that the pressing force adjusting mechanism has a function of adjusting a force of pressing the contact member against the tool and a function of attaching the contact member to the apparatus main body.
By providing the pressing force adjusting mechanism with a function of attaching the contact member to the apparatus main body, there is no need to separately provide a member for attaching the contact member to the apparatus main body, and the configuration of the chattering prevention device can be simplified.
この発明の工具のびびり防止装置は、工作機械に使用されるものであり、工具支持体に取付けられこの工具支持体に装着された工具の外周に配置される装置本体と、加工に伴って前記工具に発生する振動に対して抵抗となる方向に摩擦力が生じるように前記工具に接触させられる接触部材と、この接触部材を前記工具に押付け、かつその押付け力を調整可能な押付け力調整機構とを備えるため、工具に発生するびびり振動を抑えることができ、びびり振動の要因となる振動エネルギーの大きさに応じた調整が容易で、汎用性の高い市販の工具にも適用可能である。 The tool chatter prevention device of the present invention is used for a machine tool, and is attached to a tool support and disposed on the outer periphery of a tool mounted on the tool support, A contact member that is brought into contact with the tool so that a frictional force is generated in a direction that resists vibration generated in the tool, and a pressing force adjusting mechanism that presses the contact member against the tool and adjusts the pressing force. Therefore, chatter vibration generated in the tool can be suppressed, adjustment according to the magnitude of vibration energy that causes chatter vibration is easy, and it can be applied to a commercially available tool with high versatility.
前記接触部材における前記工具との接触部が、前記押付け力調整機構により前記工具に押付けられる方向に弾性変形可能である場合は、工具に発生する振動に対して抵抗となる方向の摩擦力を微調整可能である。 When the contact portion of the contact member with the tool is elastically deformable in a direction in which the contact member is pressed against the tool by the pressing force adjusting mechanism, a frictional force in a direction that resists vibration generated in the tool is reduced. It can be adjusted.
前記接触部材は、前記接触部とこの接触部を支持する主部とを有し、前記接触部は前記主部に対し、前記摩擦力の作用する方向に延びるスリットを介して、前記工具に押付けられる方向に隔てられ、前記スリットの端の連結部で前記主部に連結された形状である場合は、前記摩擦力が作用する方向の剛性が高く、摩擦力に対する抵抗力が強い。 The contact member includes the contact portion and a main portion that supports the contact portion, and the contact portion is pressed against the tool via a slit extending in a direction in which the frictional force acts on the main portion. In the case where the shape is connected to the main portion at the connecting portion at the end of the slit, the rigidity in the direction in which the frictional force acts is high and the resistance to the frictional force is strong.
前記押付け力調整機構は、前記接触部材を前記工具に押付ける力を調整する機能と、前記接触部材を前記装置本体に取付ける機能とを有する場合は、簡素な構造にすることができる。 The pressing force adjusting mechanism can have a simple structure when it has a function of adjusting the pressing force of the contact member against the tool and a function of attaching the contact member to the apparatus main body.
この発明の一実施形態を図面と共に説明する。図１〜図３は、この発明の工具のびびり防止装置を備えた工具支持体を示す。図の工具支持体は工具ホルダ１である。工具ホルダ１は、旋盤等の工作機械のタレット刃物台４２（図１、図２）に取付けられるものであり、回転するワークに対し固定して使用される工具３０が装着される。工具３０は、例えば内径切削加工用の工具であるボーリングバーである。工具３０は、シャンク部３０ａの先端に切刃を有している。工具３０のシャンク部３０ａは、断面形状が円形とされる。工具３０が刃物台に直接取付けられる場合は、刃物台が工具支持体となる。 An embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a tool support provided with the device for preventing chatter of the present invention. The tool support in the figure is a tool holder 1. The tool holder 1 is attached to a turret tool post 42 (FIGS. 1 and 2) of a machine tool such as a lathe, and a tool 30 that is used fixedly to a rotating workpiece is mounted thereon. The tool 30 is, for example, a boring bar that is a tool for internal diameter cutting. The tool 30 has a cutting edge at the tip of the shank portion 30a. The shank portion 30a of the tool 30 has a circular cross-sectional shape. When the tool 30 is directly attached to the tool post, the tool post serves as a tool support.
工具ホルダ１は、ベース部２の四隅に設けたボルト孔３に挿通したボルト（図示せず）により、タレット刃物台４２の外周面に取付けられる。工具ホルダ１は、タレット刃物台４２の軸心の方向であるＺ軸方向（図２）に延びる円形の貫通孔である工具装着孔４を有し、この工具装着孔４内にスリーブ部材３１を介して工具３０のシャンク部３０ａの基部３０ａａが装着される。詳しくは、工具装着孔４の内周に嵌合するスリーブ部材３１の筒状部３１ａがスリーブ固定ねじ３２で工具ホルダ１に固定され、工具装着孔４の外部に位置するスリーブ部材３１のフランジ部３１ｂに前記基部３０ａａが工具固定ねじ３３で固定される。なお、スリーブ部材３１を用いずに、工具ホルダ１の工具装着孔４内に工具３０を直接装着してもよい。 The tool holder 1 is attached to the outer peripheral surface of the turret tool post 42 by bolts (not shown) inserted through bolt holes 3 provided at the four corners of the base portion 2. The tool holder 1 has a tool mounting hole 4 which is a circular through hole extending in the Z-axis direction (FIG. 2) that is the direction of the axis of the turret tool post 42, and a sleeve member 31 is placed in the tool mounting hole 4. The base part 30aa of the shank part 30a of the tool 30 is mounted. Specifically, the cylindrical portion 31 a of the sleeve member 31 that fits to the inner periphery of the tool mounting hole 4 is fixed to the tool holder 1 by the sleeve fixing screw 32, and the flange portion of the sleeve member 31 that is located outside the tool mounting hole 4. The base 30aa is fixed to 31b with a tool fixing screw 33. Note that the tool 30 may be directly mounted in the tool mounting hole 4 of the tool holder 1 without using the sleeve member 31.
工具ホルダ１の工具先端側の端面には、工具のびびり防止装置１０が取付けられる。びびり防止装置１０は、図４に示すように、工具ホルダ１に装着された工具３０のシャンク部３０ａの外周に配置される装置本体１１と、工具３０のシャンク部３０ａを挟んで前記装置本体１１に対向して配置され一部が工具３０のシャンク部３０ａの外周面に接触させられる接触部材１２と、接触部材１２を装置本体１１に取付けると共に、接触部材１２を工具３０のシャンク部３０ａに押付ける力を調整する押付け力調整機構１３とを備える。 A tool chattering prevention device 10 is attached to the end surface of the tool holder 1 on the tool front end side. As shown in FIG. 4, the chatter preventing device 10 includes a device main body 11 disposed on the outer periphery of the shank portion 30 a of the tool 30 mounted on the tool holder 1, and the device main body 11 sandwiching the shank portion 30 a of the tool 30. The contact member 12 is disposed opposite to the contact member 12 and a part of the contact member 12 is brought into contact with the outer peripheral surface of the shank portion 30 a of the tool 30. And a pressing force adjusting mechanism 13 that adjusts the pressing force.
装置本体１１および接触部材１２は、共に肉厚が同一の板材であり、金属、例えば鋼材からなる。装置本体１１は、工具３０のシャンク部３０ａが嵌り込む程度の半径の半円形凹部１４を有し、この半円形凹部１４内に工具３０のシャンク部３０ａが位置するように配置される。 The apparatus main body 11 and the contact member 12 are both plate materials having the same thickness, and are made of metal, for example, steel. The apparatus main body 11 has a semicircular recess 14 having a radius that allows the shank 30a of the tool 30 to be fitted therein, and the shank 30a of the tool 30 is disposed in the semicircular recess 14.
接触部材１２は、工具３０と接触する部分である接触部１５と、この接触部１５を支持する主部１６とを有する。接触部１５と主部１６とは、接触部１５と工具３０との接線の方向（Ｘ軸方向）に延びるスリット１７を介して隔てられており、スリット１７の両端の周辺部である連結部１８で互いに連結されている。スリット１７の両端部１７ａは、応力集中を避けるために円形に形成されている。接触部１５は直線形の帯状で、スリット１７の長さ方向（Ｘ軸方向）と直交する方向（Ｙ軸方向）の幅が狭いため、Ｙ軸方向の剛性が低く、Ｙ軸方向に弾性変形可能である。一方、接触部１５はスリット１７の長さ方向（Ｘ軸方向）には長いため、Ｘ軸方向の剛性は高い。Ｙ軸方向は、押付け力調整機構１３により接触部材１２を工具３０に押付ける方向であり、Ｘ軸方向は、接触部材１２を工具３０に押付けることで生じる摩擦力の作用する方向である。接触部１５と工具３０の接触点Ｐは、接触部１５の長さ方向の中央であり、工具３０の中心ＯからＹ軸方向に延ばした直線Ｌ上に位置する。 The contact member 12 includes a contact portion 15 that is a portion that contacts the tool 30, and a main portion 16 that supports the contact portion 15. The contact portion 15 and the main portion 16 are separated by a slit 17 extending in a tangential direction (X-axis direction) between the contact portion 15 and the tool 30, and a connecting portion 18 that is a peripheral portion at both ends of the slit 17. Are connected to each other. Both end portions 17a of the slit 17 are formed in a circular shape in order to avoid stress concentration. The contact portion 15 is a straight belt, and since the width in the direction (Y-axis direction) perpendicular to the length direction (X-axis direction) of the slit 17 is narrow, the rigidity in the Y-axis direction is low and elastic deformation in the Y-axis direction is achieved. Is possible. On the other hand, since the contact portion 15 is long in the length direction (X-axis direction) of the slit 17, the rigidity in the X-axis direction is high. The Y-axis direction is a direction in which the contact member 12 is pressed against the tool 30 by the pressing force adjusting mechanism 13, and the X-axis direction is a direction in which a frictional force generated by pressing the contact member 12 against the tool 30 acts. A contact point P between the contact portion 15 and the tool 30 is the center in the length direction of the contact portion 15 and is located on a straight line L extending from the center O of the tool 30 in the Y-axis direction.
押付け力調整機構１３は、装置本体１１に設けられ装置本体１１と接触部材１２の並び方向（Ｙ軸方向）に延びる貫通孔である調整ボルト孔２０、接触部材１２に設けられ前記調整ボルト孔２０と同軸上に位置する調製ねじ孔２１、および調整ボルト２２で構成される。調整ボルト孔２０の側から調製ボルト２２を挿入し、その調整ボルト２２の先端のねじ部２２ａを調整ねじ孔２１に螺合させることで、接触部材１２を装置本体１１に取付ける。調整ボルト２２の頭部２２ｂは、調整ボルト孔２０における調整ボルト２２を挿入した側の開口の周縁部に当接させる。また、調整ボルト２２の調整ねじ孔２１へのねじ込み量を調整することで、接触部材１２を工具３０に押付ける押付け力が調整される。この押付け力の方向は、Ｙ軸方向すなわち摩擦力の作用する方向と直交する方向である。そのため、押付け力調整機構１３の押付け力により摩擦力を効率良く発生させることができる。図例では、工具３０を挟んで両側に２つの押付け力調整機構１３が設けられているが、１つの押付け力調整機構１３で、接触部材１２の装置本体１１への取付けと押付け力の調整とを行わせるようにしてもよい。 The pressing force adjusting mechanism 13 is provided in the apparatus main body 11 and is provided in the adjustment bolt hole 20 that is a through hole extending in the arrangement direction (Y-axis direction) of the apparatus main body 11 and the contact member 12, and the adjustment bolt hole 20 provided in the contact member 12. And the adjustment screw 22 and the adjustment screw 22 located on the same axis. The prepared bolt 22 is inserted from the adjustment bolt hole 20 side, and the screw portion 22 a at the tip of the adjustment bolt 22 is screwed into the adjustment screw hole 21, so that the contact member 12 is attached to the apparatus main body 11. The head 22 b of the adjustment bolt 22 is brought into contact with the peripheral edge of the opening on the side where the adjustment bolt 22 is inserted in the adjustment bolt hole 20. Further, the pressing force for pressing the contact member 12 against the tool 30 is adjusted by adjusting the screwing amount of the adjusting bolt 22 into the adjusting screw hole 21. The direction of the pressing force is a direction orthogonal to the Y-axis direction, that is, the direction in which the frictional force acts. Therefore, the friction force can be efficiently generated by the pressing force of the pressing force adjusting mechanism 13. In the illustrated example, two pressing force adjusting mechanisms 13 are provided on both sides of the tool 30, but the one pressing force adjusting mechanism 13 can be used to attach the contact member 12 to the apparatus main body 11 and adjust the pressing force. May be performed.
装置本体１１および接触部材１２には、それぞれ厚み方向（図４において紙面に直交する方向）に貫通する取付ねじ挿通孔２３が設けられている。この取付ねじ挿通孔２３に挿通した取付ねじ２４（図１〜図３）により、装置本体１１および接触部材１２が工具ホルダ１にそれぞれ取付けられる。なお、装置本体１１および接触部材１２を工具ホルダ１に取付けた状態において、装置本体１１および接触部材１２がＸ軸方向およびＹ軸方向にある程度移動可能であるように、取付ねじ挿通孔２３の内径は取付ねじ２４の外径よりも大きくしてある。 The apparatus main body 11 and the contact member 12 are each provided with a mounting screw insertion hole 23 that penetrates in the thickness direction (a direction orthogonal to the paper surface in FIG. 4). The apparatus main body 11 and the contact member 12 are respectively attached to the tool holder 1 by means of attachment screws 24 (FIGS. 1 to 3) inserted through the attachment screw insertion holes 23. In addition, in the state which attached the apparatus main body 11 and the contact member 12 to the tool holder 1, the internal diameter of the attachment screw penetration hole 23 so that the apparatus main body 11 and the contact member 12 can move to some extent to an X-axis direction and a Y-axis direction. Is larger than the outer diameter of the mounting screw 24.
図５は、上記工具ホルダ１を用いた工作機械の一例を概略的に示す部分平面図である。この工作機械４０はタレット旋盤であって、主軸４１およびタレット刃物台４２を備える。主軸４１は、その先端に主軸チャック４３を有し、この主軸チャック４３でワークＷを把持して回転駆動される。タレット刃物台４２は、回転中心軸が主軸４１の軸心と平行であり、図示しない送り台を介して主軸４１の軸心に沿う方向（Ｚ軸方向）と主軸４１の軸心に直交する水平方向（Ｘ軸方向）とに移動可能とされる。タレット刃物台４２は正面形状が多角形のドラム状のものであり、各角間の周面部分からなる各工具ステーションに工具ホルダ１を介して工具３０が取付けられる。図５では、一つの工具ステーションにボーリングバーからなる工具３０を取付けた状態を示している。工具３０は、工具ホルダ１から主軸４１の軸心およびタレット刃物台４２の回転中心と平行な方向に突出するように取付けられている。この工作機械４０による上記工具３０を用いるワークＷの加工では、ワークＷの先端面における凹部Ｗａの内径面加工が行われる。 FIG. 5 is a partial plan view schematically showing an example of a machine tool using the tool holder 1. The machine tool 40 is a turret lathe and includes a main shaft 41 and a turret tool post 42. The spindle 41 has a spindle chuck 43 at its tip, and is driven to rotate by gripping the workpiece W with the spindle chuck 43. The turret tool post 42 has a rotation center axis parallel to the axis of the main shaft 41, and a horizontal direction perpendicular to the axis of the main shaft 41 and a direction along the axis of the main shaft 41 through a feed table (not shown). It is possible to move in the direction (X-axis direction). The turret tool post 42 is in the form of a polygon whose front shape is a polygon, and a tool 30 is attached to each tool station consisting of a peripheral surface portion between each corner via a tool holder 1. FIG. 5 shows a state where a tool 30 made of a boring bar is attached to one tool station. The tool 30 is attached so as to protrude from the tool holder 1 in a direction parallel to the axis of the main shaft 41 and the rotation center of the turret tool post 42. In the processing of the workpiece W using the tool 30 by the machine tool 40, the inner diameter surface processing of the recess Wa on the tip surface of the workpiece W is performed.
工具３０は工具ホルダ１に片持ち梁状に取付けられているため、加工時に切り込み方向のびびり振動が発生し易い。しかし、工具ホルダ１にびびり防止装置１０を設けたことにより、上記びびり振動を抑える効果が得られる。びびり防止装置１０の作用および効果について詳しく説明する。 Since the tool 30 is attached to the tool holder 1 in a cantilever shape, chatter vibration in the cutting direction tends to occur during machining. However, by providing the chatter prevention device 10 in the tool holder 1, the effect of suppressing the chatter vibration can be obtained. The operation and effect of the chattering prevention device 10 will be described in detail.
押付け力調整機構１３の調整ボルト２２を調整ねじ孔２１に適度に締め込むことにより、接触部材１２の接触部１５が工具３０に押付けられる。それにより、工具３０と接触部材１２間に、工具３０に発生する振動に対して抵抗となる方向（Ｘ軸方向）に摩擦力が生じる。この摩擦力による摩擦減衰で、びびり振動の要因となる振動エネルギーが吸収される。接触部材１２を工具３０に押付ける押付け力を、摩擦減衰が得られる適正な大きさに設定することにより、振動エネルギーを消滅させてびびり振動を抑制させられる。前記押付け力は、調整ボルト２２の調整ねじ孔２１へのねじ込み量を変更することにより調整可能である。 By appropriately tightening the adjusting bolt 22 of the pressing force adjusting mechanism 13 into the adjusting screw hole 21, the contact portion 15 of the contact member 12 is pressed against the tool 30. Thereby, a frictional force is generated between the tool 30 and the contact member 12 in a direction (X-axis direction) that becomes resistance to vibration generated in the tool 30. The vibrational energy that causes chatter vibration is absorbed by the frictional damping due to this frictional force. By setting the pressing force that presses the contact member 12 against the tool 30 to an appropriate magnitude that provides frictional damping, vibration energy can be eliminated and chatter vibration can be suppressed. The pressing force can be adjusted by changing the screwing amount of the adjusting bolt 22 into the adjusting screw hole 21.
接触部材１２の接触部１５は、押付け方向であるＹ軸方向に弾性変形可能であるため、押付け力調整機構１３による押付け力の大きさにおける広い範囲で摩擦力を発生させることができる。つまり、押付け力の大きさの変化に比べて摩擦力の大きさの変化が小さい。よって、押付け力の変更による摩擦力の微調整がし易い。一方で、接触部材１２の接触部１５は摩擦力の作用する方向であるＸ軸方向の剛性が高いため、摩擦力に対する抵抗力が強い。 Since the contact portion 15 of the contact member 12 can be elastically deformed in the Y-axis direction that is the pressing direction, it is possible to generate a frictional force in a wide range of the pressing force by the pressing force adjusting mechanism 13. That is, the change in the magnitude of the frictional force is smaller than the change in the magnitude of the pressing force. Therefore, it is easy to finely adjust the frictional force by changing the pressing force. On the other hand, since the contact portion 15 of the contact member 12 has high rigidity in the X-axis direction, which is the direction in which the friction force acts, the resistance force against the friction force is strong.
図６は、上記例とは接触部材の形状が異なるびびり防止装置を示す。このびびり防止装置１０の接触部材１２は、スリット１７の一端の連結部１８だけで接触部１５と主部１６とが互いに連結されている。この形状であっても、押付け力の方向（Ｙ軸方向）に弾性変形可能で、かつ摩擦力の作用する方向（Ｘ軸方向）の剛性を適度に保持させることができる。 FIG. 6 shows a chattering prevention device in which the shape of the contact member is different from the above example. In the contact member 12 of the chattering prevention device 10, the contact portion 15 and the main portion 16 are connected to each other only by the connecting portion 18 at one end of the slit 17. Even in this shape, it can be elastically deformed in the direction of the pressing force (Y-axis direction), and the rigidity in the direction in which the frictional force acts (X-axis direction) can be appropriately maintained.
図７は、接触部材の形状がさらに異なるびびり防止装置を示す。このびびり防止装置１０の接触部材１２は、円形の開口２５によって接触部１５と主部１６とを押付け方向に隔てている。この場合も、スリット１７（図４、図６）を設けた接触部材１２には及ばないものの、接触部１５を弾性変形させる効果は得られる。 FIG. 7 shows a chattering prevention device in which the shape of the contact member is further different. The contact member 12 of the chattering prevention device 10 separates the contact portion 15 and the main portion 16 in the pressing direction by a circular opening 25. In this case as well, although not reaching the contact member 12 provided with the slit 17 (FIGS. 4 and 6), the effect of elastically deforming the contact portion 15 is obtained.
上記各実施形態は、ボーリングバー等の長尺な工具を装着する工具ホルダ等の工具支持体に設けたびびり防止装置について説明したが、この発明の工具のびびり防止装置は、角バイト等の他の工具を装着する工具支持体にも適用できる。 In each of the above embodiments, the chattering prevention device provided on a tool support such as a tool holder on which a long tool such as a boring bar is mounted has been described. It is applicable also to the tool support body which mounts the tool of.
１…工具ホルダ（工具支持体）
１０…びびり防止装置
１１…装置本体
１２…接触部材
１３…押付け力調整機構
１５…接触部
１６…主部
１７…スリット
１８…連結部
３０…工具
1 ... Tool holder (tool support)
DESCRIPTION OF SYMBOLS 10 ... Chatter prevention apparatus 11 ... Apparatus main body 12 ... Contact member 13 ... Pressing force adjustment mechanism 15 ... Contact part 16 ... Main part 17 ... Slit 18 ... Connection part 30 ... Tool
Claims (4)
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| JP2010102023A JP5728824B2 (en) | 2010-04-27 | 2010-04-27 | Tool chatter prevention device |
| PCT/JP2011/057772 WO2011135958A1 (en) | 2010-04-27 | 2011-03-29 | Tool chatter prevention device |
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| JP2010102023A JP5728824B2 (en) | 2010-04-27 | 2010-04-27 | Tool chatter prevention device |
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| JP5728824B2 JP5728824B2 (en) | 2015-06-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014087757A1 (en) | 2012-12-03 | 2014-06-12 | 村田機械株式会社 | Vibration reduction device for machine tool |
| JP7489902B2 (en) | 2020-11-12 | 2024-05-24 | オークマ株式会社 | Tool holders and machine tools |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63191506A (en) * | 1987-02-04 | 1988-08-09 | Nippon Denso Co Ltd | Cutter holder for machine tool |
| JPH01125103U (en) * | 1988-02-18 | 1989-08-25 | ||
| JPH05228707A (en) * | 1992-02-21 | 1993-09-07 | Mitsubishi Materials Corp | Cutting tool |
| JPH08252715A (en) * | 1995-03-20 | 1996-10-01 | Mitsubishi Heavy Ind Ltd | Planer cutting tool |
| JPH09300111A (en) * | 1996-05-16 | 1997-11-25 | Toshiba Tungaloy Co Ltd | Bite |
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2010
- 2010-04-27 JP JP2010102023A patent/JP5728824B2/en active Active
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63191506A (en) * | 1987-02-04 | 1988-08-09 | Nippon Denso Co Ltd | Cutter holder for machine tool |
| JPH01125103U (en) * | 1988-02-18 | 1989-08-25 | ||
| JPH05228707A (en) * | 1992-02-21 | 1993-09-07 | Mitsubishi Materials Corp | Cutting tool |
| JPH08252715A (en) * | 1995-03-20 | 1996-10-01 | Mitsubishi Heavy Ind Ltd | Planer cutting tool |
| JPH09300111A (en) * | 1996-05-16 | 1997-11-25 | Toshiba Tungaloy Co Ltd | Bite |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014087757A1 (en) | 2012-12-03 | 2014-06-12 | 村田機械株式会社 | Vibration reduction device for machine tool |
| EP2926929A4 (en) * | 2012-12-03 | 2016-06-29 | Murata Machinery Ltd | Vibration reduction device for machine tool |
| US9545673B2 (en) | 2012-12-03 | 2017-01-17 | Murata Machinery, Ltd. | Vibration reduction device for machine tool |
| JP7489902B2 (en) | 2020-11-12 | 2024-05-24 | オークマ株式会社 | Tool holders and machine tools |
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| JP5728824B2 (en) | 2015-06-03 |
| WO2011135958A1 (en) | 2011-11-03 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |