JP2008137110A - Main spindle device of machine tool - Google Patents

Main spindle device of machine tool Download PDF

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JP2008137110A
JP2008137110A JP2006325558A JP2006325558A JP2008137110A JP 2008137110 A JP2008137110 A JP 2008137110A JP 2006325558 A JP2006325558 A JP 2006325558A JP 2006325558 A JP2006325558 A JP 2006325558A JP 2008137110 A JP2008137110 A JP 2008137110A
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spindle
draw bar
spring
main
tapered
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JP4905093B2 (en
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Yutaka Kuribayashi
裕 栗林
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Brother Ind Ltd
ブラザー工業株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a main spindle device of a machine tool, which adjusts its balance automatically and securely by a simple configuration, and is provided with an excellent general purpose centering mechanism. <P>SOLUTION: This main spindle device 1 is provided with: a main spindle main body 3 having a tapered hole for mounting a tool holder in a front end part; a draw bar 6 incorporated into the inside of the main spindle main body 3; and a spring member 8 for energizing the draw bar 6 backward and elastically. The centering mechanism 10 for centering an axis of the main spindle main body 3 with an axis of the draw bar 6 through a cylindrical hole 5 formed in the main spindle main body 3 and including a spring member storage hole for storing the spring member 8 and main spindle main body side tapered faces 17, 21 and draw bar side tapered faces 18, 22 engaging with these tapered faces in a front end part and a rear part of the cylindrical hole 5, has: the first centering mechanism 10A for centering the axis of the main spindle main body 3 with the axis of the draw bar 6 in the front end part of the cylindrical hole 5; and the second centering mechanism 10B for centering the axis of the main spindle main body 3 with the axis of the draw bar 6 in the rear part of the cylindrical hole 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、工作機械の主軸装置に関し、特に主軸のバランスを自動的に調整する調心機構を設けたものに関する。   The present invention relates to a spindle device for a machine tool, and more particularly to a spindle device provided with a centering mechanism that automatically adjusts the balance of the spindle.
工作機械の主軸装置は、主軸本体と、主軸本体の前端部に工具をクランプする為に主軸本体の内部に組み込まれたドローバーと、主軸本体の内部の中空孔においてドローバーに外嵌されてドローバーをクランプ方向へ弾性付勢するバネ部材などを備えている。
主軸装置においては、ドローバーが主軸本体内で軸心方向へ摺動移動する構造であるため、ドローバーは主軸本体に対して径方向へ数10〜150μm程度可動に組み込まれている。そのため、主軸本体の軸心に対して、ドローバーとバネ部材などの軸心が一致しておらず、微小量ズレているのが一般的である。主軸本体が15000 〜40000 rpmもの高速で回転する際に、遠心力のバランスが崩れ、アンバランス状態となり、振動、騒音、切削精度の低下の原因となる。
The spindle device of a machine tool includes a spindle body, a draw bar built into the spindle body to clamp a tool at the front end of the spindle body, and a draw bar that is fitted over the draw bar in a hollow hole inside the spindle body. A spring member that elastically urges in the clamping direction is provided.
In the spindle apparatus, since the draw bar is configured to slide in the axial direction within the spindle body, the draw bar is incorporated so as to be movable about several tens to 150 μm in the radial direction with respect to the spindle body. For this reason, the axes of the draw bar and the spring member are generally not aligned with the axis of the main spindle body, and are generally misaligned. When the spindle body rotates at a high speed of 15000 to 40000 rpm, the balance of centrifugal force is lost and becomes unbalanced, causing vibration, noise and cutting accuracy to decrease.
そこで、工作機械のメーカーは、工作機械の出荷前に主軸装置のバランス調整を行う。このバランス調整は、工具を装着した状態で行う場合もあり、工具を装着しない状態で行う場合もある。特許文献1の工作機械の主軸の回転バランス調整技術では、主軸本体の前端部と後端部に径方向の複数の穴を形成して、これらの穴に錘を装着することで、バランス調整を行い、さらに、主軸本体の長さ方向途中部において前部皿バネ部材と後部皿バネ部材との間においてドローバーにリングを装着し、主軸本体の長さ方向途中部にアンバランスがある場合には、リングを適量切削することでバランス調整を行う。   Therefore, machine tool manufacturers adjust the balance of the spindle device before shipping the machine tool. This balance adjustment may be performed with the tool mounted or may be performed without the tool mounted. In the rotation balance adjustment technology of the spindle of the machine tool of Patent Document 1, a plurality of radial holes are formed in the front end portion and the rear end portion of the spindle body, and the balance adjustment is performed by attaching weights to these holes. If a ring is attached to the draw bar between the front Belleville spring member and the rear Belleville spring member in the middle of the spindle body in the length direction, and there is an unbalance in the middle of the spindle body in the length direction The balance is adjusted by cutting an appropriate amount of the ring.
特許文献2の主軸装置においては、ドローバーの前部と後部の一方に、右巻き螺旋皿バネを外装し、前部と後部の他方に左巻き螺旋皿バネを外装し、両皿バネの間でドローバーに中間間座を外嵌し、この中間間座をドローバーにラジアル軸受けにより回転自在に支持している。   In the spindle device of Patent Document 2, a right-handed spiral disc spring is externally mounted on one of the front part and the rear part of the drawbar, and a left-handed spiral disc spring is externally provided on the other of the front part and the rear part. The intermediate spacer is externally fitted to the intermediate spacer, and the intermediate spacer is rotatably supported on the draw bar by a radial bearing.
特許文献3の主軸装置においては、ドローバーを付勢する皿バネと主軸本体の軸心とを一致させる為に、バネ収容孔(軸孔)の内面を研磨加工し、皿バネの外周面をバネ収容孔(軸孔)の内面に当接させる構成を採用している。
特開平6−126589号公報 特開2003−334705号公報 特開2005−279874号公報
In the spindle device of Patent Document 3, in order to make the disc spring for biasing the draw bar coincide with the axis of the spindle main body, the inner surface of the spring accommodating hole (shaft hole) is polished and the outer peripheral surface of the disc spring is moved to the spring. A configuration is adopted in which the inner surface of the accommodation hole (shaft hole) is brought into contact.
JP-A-6-126589 JP 2003-334705 A JP 2005-279874 A
特許文献1の回転バランス調整技術では、個々の主軸装置毎に、アンバランスを測定して主軸本体の前端部や後端部の穴に調整用の錘を固定するためバランス調整に多くの労力と時間がかかる。しかも、バネ部材として前後に分割された前部皿バネと後部皿バネとを採用する必要があるため、1本の螺旋状バネ部材を採用することができない。
特許文献2の主軸装置も、右巻き螺旋皿バネと、左巻き螺旋皿バネを採用するため、1本の螺旋状バネ部材を採用することができないうえ、中間間座の構造が複雑化する。
In the rotational balance adjustment technique of Patent Document 1, imbalance is measured for each spindle device, and the adjustment weight is fixed to the holes at the front end portion and the rear end portion of the main spindle body. take time. And since it is necessary to employ | adopt the front disc spring and the rear disc spring divided | segmented into the front and back as a spring member, one spiral spring member cannot be employ | adopted.
Since the spindle device of Patent Document 2 also employs a right-handed spiral disc spring and a left-handed spiral disc spring, a single spiral spring member cannot be adopted, and the structure of the intermediate spacer is complicated.
特許文献3の主軸装置では、皿バネの外周面をバネ収容孔(軸孔)の内面に当接させる構成であるため、皿バネが軸心に方向に圧縮される際に、皿バネの外径が拡大できないため、皿バネが円滑に伸縮しにくくなり、工具をアンクランプする際のアンクランプ力が大きくなる虞がある。しかも、バネ収容孔の内面を研磨加工するコストも高価になる。   In the spindle device of Patent Document 3, since the outer peripheral surface of the disc spring is in contact with the inner surface of the spring accommodating hole (shaft hole), when the disc spring is compressed in the axial direction, Since the diameter cannot be increased, the disc spring is difficult to smoothly expand and contract, and there is a concern that the unclamping force when the tool is unclamped becomes large. In addition, the cost of polishing the inner surface of the spring accommodating hole is also expensive.
本発明の目的は、主軸のバランスを自動的に調整可能な主軸装置を提供すること、バネ部材の構造の制約を受けない汎用性に優れる主軸装置を提供すること、簡単な構成の主軸装置を提供すること、等である。   An object of the present invention is to provide a spindle device that can automatically adjust the balance of the spindle, to provide a spindle device that is excellent in versatility without being restricted by the structure of the spring member, and to a spindle device with a simple configuration. Providing, etc.
請求項1の工作機械の主軸装置は、前端部に工具ホルダ装着用テーパ穴を形成した主軸本体と、この主軸本体の内部に組み込まれたドローバーと、このドローバーを後方へ弾性付勢するバネ部材とを備えた工作機械の主軸装置において、主軸本体の内部に形成されバネ部材を収容するバネ部材収容孔を含む円筒孔と、この円筒孔の前端部分と後部の少なくとも一方において、主軸本体に設けられた主軸本体側テーパ面とこの主軸本体側テーパ面に係合するドローバーに設けられたドローバー側テーパ面を介して、主軸本体の軸心とドローバーの軸心とを一致させる調心機構とを備えたことを特徴としている。   A spindle device for a machine tool according to claim 1, wherein a spindle main body having a tool holder mounting tapered hole formed at a front end, a draw bar incorporated in the spindle main body, and a spring member for elastically biasing the draw bar rearward A cylindrical hole including a spring member receiving hole that is formed inside the main spindle body and receives a spring member, and at least one of a front end portion and a rear portion of the cylindrical hole is provided in the main spindle body. And a centering mechanism for aligning the axis of the spindle body with the axis of the draw bar via the drawbar side tapered surface provided on the drawbar engaged with the spindle body side tapered surface. It is characterized by having prepared.
この主軸装置においては、主軸本体の内部にバネ部材収容孔を含む円筒孔が形成され、前記調心機構により、円筒孔の前端部分と後部の少なくとも一方において、主軸本体側テーパ面とこの主軸本体側テーパ面に係合するドローバー側テーパ面を介して、主軸本体の軸心とドローバーの軸心とが一致するように自動的に調心される。   In this spindle apparatus, a cylindrical hole including a spring member accommodation hole is formed inside the main spindle body, and the main spindle main body side taper surface and the main spindle main body are formed in at least one of the front end portion and the rear portion of the cylindrical hole by the alignment mechanism. Through the draw bar side taper surface engaged with the side taper surface, alignment is automatically performed so that the axis of the main spindle body coincides with the axis of the draw bar.
請求項2の工作機械の主軸装置は、請求項1の発明において、前記調心機構は、前記円筒孔の前端部分において主軸本体の軸心とドローバーの軸心とを一致させる第1調心機構と、前記円筒孔の後部において主軸本体の軸心とドローバーの軸心とを一致させる第2調心機構とを有することを特徴としている。   The spindle device of the machine tool according to claim 2 is the invention according to claim 1, wherein the alignment mechanism is a first alignment mechanism that aligns the axis of the spindle main body and the axis of the draw bar at the front end portion of the cylindrical hole. And a second aligning mechanism that aligns the axis of the main spindle body and the axis of the draw bar at the rear of the cylindrical hole.
請求項3の工作機械の主軸装置は、請求項2の発明において、前記第1調心機構は、前記ドローバーに形成された鍔状大径部と、前記円筒孔に径方向へ可動に内嵌され且つ前記鍔状大径部に径方向へ移動不能に外嵌され且つ前記バネ部材の前端部を受け止める第1バネ受け部材と、前記円筒孔の前端部分の外周側部分に形成された前方程小径化する第1テーパ面と、前記バネ受け部材の前端部分の外周側部分に形成されて前記第1テーパ面に係合する第2テーパ面とを備えたことを特徴としている。   According to a third aspect of the present invention, there is provided a spindle device for a machine tool according to the second aspect, wherein the first aligning mechanism is fitted in a flange-shaped large-diameter portion formed on the draw bar and in a diametrically movable manner in the cylindrical hole. A first spring receiving member that is externally fitted to the bowl-shaped large-diameter portion so as to be immovable in the radial direction and receives the front end portion of the spring member, and a forward portion formed on the outer peripheral side portion of the front end portion of the cylindrical hole. A first tapered surface having a reduced diameter and a second tapered surface that is formed on an outer peripheral side portion of the front end portion of the spring receiving member and engages with the first tapered surface are provided.
この主軸装置では、バネ部材の前端部を受け止める第1バネ受け部材が、円筒孔に径方向へ可動に内嵌され且つドローバーに形成された鍔状大径部に径方向へ移動不能に外嵌されているため、第1バネ受け部材がバネ部材の弾性付勢力で前方へ付勢されると、この第1バネ受け部材に形成された第2テーパ面が主軸本体側の第1テーパ面に係合すると、第1バネ受け部材と鍔状大径部とドローバーの軸心が主軸本体の軸心に一致するように、調心を行う。工具ホルダを装着した状態でも工具ホルダを装着してない状態でも調心作用が得られる。   In this spindle apparatus, the first spring receiving member that receives the front end portion of the spring member is fitted in the cylindrical hole so as to be movable in the radial direction, and is fitted in the flange-shaped large diameter portion formed in the draw bar so as not to move in the radial direction. Therefore, when the first spring receiving member is urged forward by the elastic urging force of the spring member, the second tapered surface formed on the first spring receiving member becomes the first tapered surface on the main spindle body side. When engaged, alignment is performed so that the first spring bearing member, the bowl-shaped large diameter portion, and the axis of the draw bar coincide with the axis of the main spindle body. The aligning action can be obtained even when the tool holder is mounted or not.
請求項4の工作機械の主軸装置は、請求項2叉は3の発明において、前記第2調心機構は、前記円筒孔の内周部に固定され且つ前端部分に後方程小径化する第3テーパ面を有する環状部材と、前記円筒孔に径方向へ可動に内嵌され且つドローバーに固定されてバネ部材の後端部を受け止める第2バネ受け部材と、前記第2バネ受け部材に形成され且つ第3テーパ面に係合する第4テーパ面とを備えたことを特徴としている。   According to a fourth aspect of the present invention, there is provided a spindle device for a machine tool according to the second or third aspect, wherein the second aligning mechanism is fixed to the inner peripheral portion of the cylindrical hole and is reduced in diameter toward the front end portion. An annular member having a tapered surface, a second spring receiving member that is movably fitted in the cylindrical hole in the radial direction and is fixed to the draw bar, and receives the rear end portion of the spring member, and the second spring receiving member. And a fourth tapered surface engaged with the third tapered surface.
ドローバーに固定された第2バネ受け部材が、バネ部材の弾性付勢力で後方へ付勢されると、第2バネ受け部材の第4テーパ面が、主軸本体に固定された環状部材の第3テーパ面に係合し、第2バネ受け部材とドローバーの軸心が、主軸本体の軸心と一致するように自動的に調心がなされる。工具ホルダを装着してない状態において調心作用が得られる。   When the second spring receiving member fixed to the draw bar is urged backward by the elastic urging force of the spring member, the fourth tapered surface of the second spring receiving member is the third of the annular member fixed to the main spindle body. Engagement with the tapered surface automatically aligns the shaft center of the second spring receiving member and the draw bar with the shaft center of the main spindle body. A centering action can be obtained in a state where the tool holder is not mounted.
請求項5の工作機械の主軸装置は、請求項3の発明において、前記第1バネ受け部材はその後端部分に形成されたフランジ部を有し、このフランジ部の前端面と前記鍔状大径部の後端面との間には、工具ホルダを工具ホルダ装着用テーパ穴に装着していない状態においても隙間が形成されていることを特徴としている。   According to a fifth aspect of the present invention, there is provided a spindle device for a machine tool according to the third aspect, wherein the first spring receiving member has a flange portion formed at a rear end portion thereof, and a front end surface of the flange portion and the bowl-shaped large diameter. A gap is formed between the rear end surface of the part and the tool holder even when the tool holder is not mounted in the tool holder mounting taper hole.
請求項6の工作機械の主軸装置は、請求項4の発明において、前記環状部材は、前記主軸本体に内嵌状に螺合して固定されたことを特徴としている。   A main spindle device of a machine tool according to a sixth aspect is the invention according to the fourth aspect, wherein the annular member is fixed to the main spindle body by being screwed into an inner fitting shape.
請求項1の発明によれば、主軸本体の内部にバネ部材収容孔を含む円筒孔が形成され、前記調心機構により、円筒孔の前端部分と後部の少なくとも一方において、主軸本体側テーパ面とこの主軸本体側テーパ面に係合するドローバー側テーパ面を介して、主軸本体の軸心とドローバーの軸心とが一致するように自動的に調心されるので、主軸本体のアンバランスを大幅に軽減することができ、振動と騒音を低減させ、加工精度を向上させることができる。   According to the first aspect of the present invention, a cylindrical hole including a spring member accommodation hole is formed inside the main spindle body, and at least one of the front end portion and the rear portion of the cylindrical hole by the alignment mechanism, Via the drawbar side taper surface that engages with the main spindle body side taper surface, the spindle body is automatically aligned with the drawbar axis so that the unbalance of the main spindle body is greatly increased. Therefore, vibration and noise can be reduced, and machining accuracy can be improved.
しかも、前記調心機構は主軸本体側テーパ面とドローバー側テーパ面を介して調心する構成であるため、調心機構の構成が簡単になる。バネ部材は、軸心方向に連続する1本の螺旋バネでもよく、皿バネでもよく、前部バネと後部バネとに分割したバネでもよいので、バネ部材の制約を受けないから、汎用性に優れる。
また、調心機構は、少なくとも、主軸本体に工具ホルダを装着してない状態において調心可能な構造になるが、円筒孔の前端部分において調心する調心機構は、主軸本体への工具ホルダの装着の有無によらず調心可能なものに構成可能である。
In addition, since the alignment mechanism is aligned through the main spindle body side tapered surface and the draw bar side tapered surface, the configuration of the alignment mechanism is simplified. The spring member may be a single spiral spring that is continuous in the axial direction, a disc spring, or a spring that is divided into a front spring and a rear spring. Excellent.
The alignment mechanism has a structure that can be aligned at least when the tool holder is not attached to the main spindle body, but the alignment mechanism that aligns at the front end portion of the cylindrical hole has a tool holder for the main spindle body. It can be configured so that it can be aligned regardless of whether or not it is attached.
請求項2の発明によれば、前記調心機構が、前記円筒孔の前端部分で調心する第1調心機構と、前記円筒孔の後部で調心する第2調心機構を有するため、主軸本体のアンバランスを一層効果的に軽減することができる。   According to the invention of claim 2, the alignment mechanism has a first alignment mechanism that aligns at the front end portion of the cylindrical hole and a second alignment mechanism that aligns at the rear part of the cylindrical hole. The unbalance of the main spindle body can be reduced more effectively.
請求項3の発明によれば、第1調心機構は、簡単な構造の鍔状大径部と第1,第2テーパ面を設け、バネ部材の前端部を受け止める第1バネ受け部材に第2テーパ面を形成するため、第1バネ受け部材を有効活用して、第1バネ受け部材と鍔状大径部とドローバーの軸心が主軸本体の軸心に一致するように、自動的に調心を行うことができ、第1バネ受け部材は常時バネ部材で付勢され、第2テーパ面が第1テーパ面に常時接触するため、工具ホルダを装着した状態でも装着しない状態でも調心がなされる。   According to the invention of claim 3, the first aligning mechanism is provided with a simple-shaped bowl-shaped large-diameter portion and first and second tapered surfaces, and the first spring receiving member receives the front end portion of the spring member. 2 In order to form a tapered surface, the first spring receiving member is effectively utilized so that the first spring receiving member, the bowl-shaped large diameter portion, and the axis of the draw bar coincide with the axis of the main spindle body. Alignment can be performed, and the first spring receiving member is always urged by the spring member, and the second taper surface is always in contact with the first taper surface, so that the alignment is performed with or without the tool holder mounted. Is made.
請求項4の発明によれば、第2調心機構は、簡単な構造の環状部材と、第3,第4テーパ面を設け、バネ部材の後端部を受け止める第2バネ受け部材を有効活用して、第2バネ受け部材とドローバーの軸心が主軸本体の軸心に一致するように、自動的に調心を行うことができる。工具ホルダを装着してない状態では、第2バネ受け部材が最大限後退するため、第4テーパ面が第3テーパ面に接触するため、調心作動が得られる。   According to the invention of claim 4, the second aligning mechanism is provided with the simple structure of the annular member and the third and fourth tapered surfaces, and effectively utilizes the second spring receiving member for receiving the rear end portion of the spring member. Thus, alignment can be automatically performed so that the axis centers of the second spring receiving member and the draw bar coincide with the axis center of the main spindle body. In a state where the tool holder is not mounted, the second spring receiving member is retracted as much as possible, so that the fourth taper surface comes into contact with the third taper surface, so that a centering operation is obtained.
請求項5の発明によれば、前記第1バネ受け部材はその後端部分に形成されたフランジ部を有し、このフランジ部の前端面と前記鍔状大径部の後端面との間には、工具ホルダを工具ホルダ装着用テーパ穴に装着していない状態においても隙間が形成されているため、工具ホルダを装着せずにドローバーが最大限後退した位置になっても、鍔状大径部がフランジ部に当接せず、第1,第2テーパ面が係合状態を維持するため、工具ホルダを装着しない状態でも確実に調心がなされる。   According to the invention of claim 5, the first spring receiving member has a flange portion formed at the rear end portion, and between the front end surface of the flange portion and the rear end surface of the bowl-shaped large diameter portion. Even when the tool holder is not mounted in the tool holder mounting taper hole, a gap is formed, so even if the draw bar is fully retracted without mounting the tool holder, the bowl-shaped large-diameter portion Since the first and second tapered surfaces maintain the engaged state without contacting the flange portion, alignment is ensured even when the tool holder is not mounted.
請求項6の発明によれば、前記環状部材は前記主軸本体に内嵌状に螺合して固定されているため、主軸装置の組み立ての際に、円筒孔にドローバーや第1,第2バネ受け部材を挿入後に、環状部材を主軸本体に螺合して固定することができる。   According to the sixth aspect of the present invention, since the annular member is screwed and fixed to the main spindle main body so as to fit inside, the draw bar and the first and second springs are inserted into the cylindrical hole when the main spindle device is assembled. After the receiving member is inserted, the annular member can be screwed and fixed to the main spindle body.
本発明の工作機械の主軸装置は、主軸本体の内部に形成されバネ部材を収容するバネ部材収容孔を含む円筒孔と、この円筒孔の前端部分と後部の少なくとも一方において、主軸本体側テーパ面とこの主軸本体側テーパ面に係合するドローバー側テーパ面を介して、主軸本体の軸心とドローバーの軸心とを一致させる調心機構とを備えたものである。   The spindle device of the machine tool according to the present invention includes a cylindrical hole including a spring member receiving hole that is formed inside the main spindle body and receives a spring member, and at least one of a front end portion and a rear portion of the cylindrical hole. And a centering mechanism for aligning the axis of the main spindle body and the axis of the draw bar via a draw bar side taper surface engaged with the main spindle body side taper surface.
次に、本発明の実施例について、図1〜図5に基づいて説明する。
図1〜図3に示すように、工作機械の主軸装置1は、主軸ヘッドの主軸台(図示略)に 4組のラジアル軸受2を介して回転自在に支持された主軸本体3と、スペーサ4と、この主軸本体3の内部に形成された円筒孔5と、ドローバー6と、ドローバー6の後端部に固定されたドローバー延長部材7と、工具付きの工具ホルダ(図示略)をクランプする弾性力を発生させるバネ部材8と、工具ホルダをチャックするチャック機構9と、調心機構10(第1,第2調心機構10A,10B)と、アンクランプ用アクチュエータにより操作されるアンクランプリング11などを備えている。
なお、図1〜図3には主軸装置1を水平姿勢に図示した関係上、図1〜図3上の上下左右を上下左右として説明し、図4には主軸装置1を立型工作機械の主軸ヘッドに立向き姿勢に装備した例を図示してある。
Next, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 3, a spindle device 1 of a machine tool includes a spindle body 3 rotatably supported on a spindle head (not shown) of a spindle head via four sets of radial bearings 2, and a spacer 4. And a cylindrical hole 5 formed in the main spindle body 3, a draw bar 6, a draw bar extending member 7 fixed to the rear end of the draw bar 6, and an elasticity for clamping a tool holder (not shown) with a tool. Spring member 8 for generating force, chuck mechanism 9 for chucking the tool holder, alignment mechanism 10 (first and second alignment mechanisms 10A and 10B), and unclamping ring 11 operated by an unclamping actuator Etc.
1 to 3 will be described with the vertical and horizontal directions on FIGS. 1 to 3 as the vertical and horizontal directions, and FIG. 4 illustrates the spindle device 1 of a vertical machine tool. An example in which the spindle head is installed in a standing posture is shown.
前記主軸本体3の前端部には、工具ホルダ装着用テーパ穴12が形成されている。主軸本体3の後端部には、主軸駆動モータ(図示略)の出力軸にカップリングを介して連結される連結軸部3aが形成されている。工具ホルダに取り付けられた工具でワークを切削加工する際には、主軸本体3とその内部の諸部材は主軸駆動モータにより約16000 〜20000 rpmの速度にて回転駆動される。   A tool holder mounting taper hole 12 is formed at the front end of the main spindle body 3. A connecting shaft portion 3a connected to an output shaft of a main shaft drive motor (not shown) via a coupling is formed at the rear end portion of the main shaft body 3. When a workpiece is cut with a tool attached to the tool holder, the main spindle body 3 and its various members are rotationally driven by a main spindle drive motor at a speed of about 16000 to 20000 rpm.
前記主軸本体3の前端側部分の内部には、ドローバー6の前端部に連結されたチャック機構9が設けられている。前記円筒孔5は、バネ部材8を収容するバネ部材収容孔5aと、このバネ部材収容孔5aの前側に連通状に形成されバネ受け部材13を収容するバネ受け部材収容孔5bと、バネ部材収容孔5aより後方において主軸本体3の後部内に形成され且つドローバー延長部材7を収容するドローバー延長部材収容孔5cとを有する。   A chuck mechanism 9 connected to the front end portion of the draw bar 6 is provided inside the front end side portion of the main spindle body 3. The cylindrical hole 5 includes a spring member accommodation hole 5a that accommodates the spring member 8, a spring reception member accommodation hole 5b that is formed in communication with the front side of the spring member accommodation hole 5a and accommodates the spring reception member 13, and a spring member. It has a draw bar extension member accommodation hole 5c which is formed in the rear part of the main spindle body 3 behind the accommodation hole 5a and accommodates the draw bar extension member 7.
前記ドローバー6は主軸本体3の内部にほぼ同心状に配設されている。このドローバー6は、バネ部材収容孔5a内に配置されたドローバー本体6aと、このドローバー本体6aから前方へ延びてチャック機構9に連結された連結軸部6bと、ドローバー本体6aの後端部分に螺合にて固定されたドローバー延長部材7と、ドローバー本体6aの前端部に形成された鍔状大径部6cとを有する。前記連結軸部6bとチャック機構9は、主軸本体3に対して径方向へ数100μm程度可動に装着されている。前記ドローバー延長部材7も円筒孔5の内周面に対して径方向へ数10μm程度可動に装着されている。   The draw bar 6 is disposed substantially concentrically inside the main spindle body 3. The draw bar 6 includes a draw bar main body 6a disposed in the spring member receiving hole 5a, a connecting shaft portion 6b extending forward from the draw bar main body 6a and connected to the chuck mechanism 9, and a rear end portion of the draw bar main body 6a. It has the draw bar extension member 7 fixed by screwing, and the bowl-shaped large diameter part 6c formed in the front-end part of the draw bar main body 6a. The connecting shaft portion 6b and the chuck mechanism 9 are movably attached to the main spindle body 3 by about several hundreds of micrometers in the radial direction. The draw bar extending member 7 is also mounted so as to be movable about several tens of micrometers in the radial direction with respect to the inner peripheral surface of the cylindrical hole 5.
前記バネ部材8は、偏平な矩形断面のバネ鋼製の螺旋バネ(螺旋皿バネ)であり、バネ部材収容孔5a内においてドローバー本体6aに外装され、バネ部材8の内周面とドローバー本体6aの外周面との間には小さな隙間が形成されている。また、バネ部材8の外周面と円筒孔5の内周面との間には僅かな隙間が形成されている。   The spring member 8 is a spiral spring (spiral disc spring) made of spring steel having a flat rectangular cross section, and is externally mounted on the draw bar main body 6a in the spring member accommodation hole 5a, and the inner peripheral surface of the spring member 8 and the draw bar main body 6a. A small gap is formed between the outer peripheral surfaces of the two. A slight gap is formed between the outer peripheral surface of the spring member 8 and the inner peripheral surface of the cylindrical hole 5.
前記バネ部材8は、バネ部材収容孔5a内に圧縮状に配設され、バネ部材8の前端(図示の左端)がバネ受け部材13のフランジ部13fの後端面で受け止められ、バネ部材8の後端がドローバー延長部材7の前端面で受け止められている。この結果、ドローバー6は、バネ部材8によって後方(図示の右方)へ強力に弾性付勢されている。   The spring member 8 is disposed in a compressed manner in the spring member accommodation hole 5 a, and the front end (the left end in the drawing) of the spring member 8 is received by the rear end surface of the flange portion 13 f of the spring receiving member 13. The rear end is received by the front end surface of the draw bar extending member 7. As a result, the draw bar 6 is strongly elastically biased backward (rightward in the drawing) by the spring member 8.
工具付きの工具ホルダ(図示略)を装着した状態では、工具ホルダのシャンク部が前記テーパ穴12に係合し、チャック機構9の複数のチャック爪9aがシャンク部に設けられたチャック爪係合穴に係合する。この結果、工具ホルダはドローバー6により後方へ強力に弾性付勢されてクランプ状態になる。   In a state where a tool holder (not shown) with a tool is mounted, the shank portion of the tool holder engages with the tapered hole 12, and a plurality of chuck claws 9a of the chuck mechanism 9 are chuck claw engagement provided on the shank portion. Engage with the hole. As a result, the tool holder is strongly elastically urged rearward by the draw bar 6 to be in a clamped state.
工具交換の為に工具付きの工具ホルダをアンクランプする場合には、アンクランプリング11を介してドローバー延長部材7をバネ部材8の付勢力に抗して前方へ押動可能に構成されている。そこで、アンクランプリング11の後端付近部において、主軸本体3に1対の長円孔14が前後方向に細長く形成され、ドローバー延長部材7に1つのピン孔15が形成されている。ピン部材16がピン孔15と長円孔14に挿通され、ピン部材16の両端部がアンクランプリング11に連結されている。   When unclamping a tool holder with a tool for tool replacement, the draw bar extension member 7 is configured to be able to push forward against the biasing force of the spring member 8 via the unclamp ring 11. . Therefore, in the vicinity of the rear end of the unclamp ring 11, a pair of oblong holes 14 are formed in the main spindle body 3 in the front-rear direction, and one pin hole 15 is formed in the draw bar extension member 7. The pin member 16 is inserted into the pin hole 15 and the oval hole 14, and both end portions of the pin member 16 are connected to the unclamp ring 11.
図4、図5に示すように、主軸装置1は図示外の主軸ヘッド昇降機構により昇降駆動される主軸ヘッド30に立向き姿勢に装備されている。主軸本体3の連結軸部3aはカップリング38を介して主軸駆動モータ39の出力軸39aに連結されている。
主軸ヘッド30にほぼ「へ」字形のアンクランプレバー31が立向きに配設され、アンクランプレバー31の下端部が主軸ヘッド30に固定された1対のブラケット32にピン部材33を介して回動可能に連結されている。アンクランプレバー31の下端部から主軸装置1側へ延びる二股の押圧アーム34が設けられ、この二股の押圧アーム34の先端部はアンクランプリング11の両側に位置している。
As shown in FIGS. 4 and 5, the spindle device 1 is mounted in a standing posture on a spindle head 30 that is driven up and down by a spindle head lifting mechanism (not shown). The connecting shaft portion 3 a of the main spindle body 3 is connected to the output shaft 39 a of the main spindle drive motor 39 via the coupling 38.
A substantially “h” -shaped unclamp lever 31 is disposed on the spindle head 30 in an upright direction, and a lower end portion of the unclamp lever 31 is rotated via a pin member 33 to a pair of brackets 32 fixed to the spindle head 30. It is linked movably. A bifurcated pressing arm 34 extending from the lower end portion of the unclamping lever 31 to the spindle device 1 side is provided, and tip portions of the bifurcated pressing arm 34 are located on both sides of the unclamping ring 11.
前記1対の押圧アーム34の先端部に夫々ローラ35(図5参照)が回転可能に設けられ、これら1対のローラ35が、アンクランプリング11のフランジ部材11aに常時非接触で接近している。アンクランプレバー31の上端部にはローラ36が回転可能に設けられている。アンクランプレバー31は図示外の板バネにより図4において反時計方向へ付勢されている。主軸ヘッド30の上方には、工作機械の静止側の機枠に固定されたカム部材37が設けられ、カム部材37の下端部にはローラ36が乗り上げる傾斜面37a が形成されている。   Rollers 35 (see FIG. 5) are rotatably provided at the tip portions of the pair of pressing arms 34, respectively, and the pair of rollers 35 always approach the flange member 11a of the unclamp ring 11 without contact. Yes. A roller 36 is rotatably provided at the upper end portion of the unclamp lever 31. The unclamp lever 31 is urged counterclockwise in FIG. 4 by a leaf spring (not shown). A cam member 37 fixed to the machine frame on the stationary side of the machine tool is provided above the spindle head 30, and an inclined surface 37 a on which the roller 36 rides is formed at the lower end portion of the cam member 37.
工具ホルダTを交換するとき、主軸ヘッド30が所定の上限位置へ上昇駆動され、その上昇の途中で、アンクランプレバー31の上端のローラ36が傾斜面37aを経てカム部材37へ乗り上げると、アンクランプレバー31が時計方向へ回動し、押圧アーム34 の1対のローラ35によってフランジ部11aを押し、アンクランプリング11を下方(前方)へ所定ストローク移動させる。   When exchanging the tool holder T, the spindle head 30 is driven up to a predetermined upper limit position, and when the roller 36 at the upper end of the unclamp lever 31 rides on the cam member 37 via the inclined surface 37a in the middle of the rise, The clamp lever 31 rotates clockwise, the flange portion 11a is pushed by the pair of rollers 35 of the pressing arm 34, and the unclamp ring 11 is moved downward (forward) by a predetermined stroke.
すると、ドローバー延長部材7を含むドローバー6の全体が下方(前方)へ所定ストローク移動して、工具ホルダTがクランプ解除される。工具ホルダTを取り外した状態において、主軸ヘッド30を下降させて、ローラ36をカム部材37から離隔させ、アンクランプリング11を原位置に復帰させると、ドローバー延長部材7は、ピン部材16を介してアンクランプリング11により最大後退位置に保持される。   Then, the entire draw bar 6 including the draw bar extending member 7 moves downward (forward) by a predetermined stroke, and the tool holder T is released from the clamp. When the spindle head 30 is lowered with the tool holder T removed, the roller 36 is separated from the cam member 37 and the unclamp ring 11 is returned to the original position, the draw bar extension member 7 is interposed via the pin member 16. The unclamp ring 11 is held at the maximum retracted position.
図1〜図3に示すように、この主軸装置1には、この円筒孔5の前端部分と後部において、主軸本体側テーパ面とこの主軸本体側テーパ面に係合するドローバー側テーパ面を介して、主軸本体3の軸心とドローバー6の軸心とを一致させる調心機構10が設けられている。この調心機構10は、円筒孔5の前端部分において主軸本体3の軸心とドローバー6の軸心とを一致させる第1調心機構10Aと、円筒孔5の後部において主軸本体3の軸心とドローバー6の軸心とを一致させる第2調心機構10Bとを有する。   As shown in FIG. 1 to FIG. 3, the main spindle device 1 includes a main spindle body side tapered surface and a draw bar side tapered surface that engages with the main spindle main body side tapered surface at the front end portion and the rear portion of the cylindrical hole 5. Thus, an alignment mechanism 10 is provided for aligning the axis of the main spindle body 3 with the axis of the draw bar 6. This aligning mechanism 10 includes a first aligning mechanism 10A that aligns the axis of the main spindle body 3 and the axis of the draw bar 6 at the front end portion of the cylindrical hole 5, and the axis of the main spindle body 3 at the rear of the cylindrical hole 5. And a second aligning mechanism 10B that aligns the axis of the draw bar 6 with each other.
前記第1調心機構10Aは、ドローバー6に形成された前記鍔状大径部6cと、バネ受け部材13(第1バネ受け部材)と、環状の第1テーパ面17(主軸本体側テーパ面)と、環状の第2テーパ面18(ドローバー側テーパ面)等で構成されている。前記バネ受け部材13は、円筒孔5に径方向へ数10μm程度可動に内嵌され且つ前記鍔状大径部6cに径方向へ移動不能に外嵌されている。このバネ受け部材13の後端部分にバネ部材8の前端部を受け止めるフランジ部13fが形成されている。   The first alignment mechanism 10A includes the flange-shaped large-diameter portion 6c formed on the draw bar 6, a spring receiving member 13 (first spring receiving member), and an annular first tapered surface 17 (main shaft main body side tapered surface). ) And an annular second tapered surface 18 (drawbar side tapered surface) and the like. The spring receiving member 13 is fitted in the cylindrical hole 5 so as to be movable about several tens of μm in the radial direction, and is externally fitted in the flange-like large diameter portion 6c so as not to move in the radial direction. A flange portion 13 f that receives the front end portion of the spring member 8 is formed at the rear end portion of the spring receiving member 13.
図示のように、工具(工具ホルダ)を装着していない状態においては、ドローバー6が主軸本体3に対して最大限後退した前記最大後退位置になるが、ドローバー6がこの最大後退位置にあるときにも、鍔状大径部6cの後端面とフランジ部13fの前端面との間に所定の隙間が形成されている。   As shown in the drawing, when the tool (tool holder) is not mounted, the draw bar 6 is at the maximum retracted position where the draw bar 6 is retracted to the maximum extent with respect to the main spindle body 3, but when the draw bar 6 is at the maximum retracted position. In addition, a predetermined gap is formed between the rear end surface of the bowl-shaped large-diameter portion 6c and the front end surface of the flange portion 13f.
前記第1テーパ面17は、円筒孔5の前端部分の外周側部分に前方程小径化するテーパ面に形成されている。前記第2テーパ面18は、バネ受け部材13の前端部分の外周側部分に形成されて第1テーパ面17に面接触にて係合している。第1,第2テーパ面17,18を研磨加工するのが望ましく、第1,第2テーパ面17,18が主軸本体3の軸心となす角度は約30〜45度とするのが望ましい。   The first tapered surface 17 is formed in a tapered surface that decreases in diameter toward the front in the outer peripheral side portion of the front end portion of the cylindrical hole 5. The second tapered surface 18 is formed on the outer peripheral side portion of the front end portion of the spring receiving member 13 and is engaged with the first tapered surface 17 by surface contact. The first and second tapered surfaces 17 and 18 are preferably polished, and the angle formed by the first and second tapered surfaces 17 and 18 and the axis of the main spindle body 3 is preferably about 30 to 45 degrees.
工具クランプ状態でもアンクランプ状態でも常時、バネ受け部材13がバネ部材8の付勢力で前方へ付勢されるため、第1,第2テーパ面17,18が面接触状態を維持する。その結果、主軸本体3の軸心と、バネ受け部材13の軸心と、ドローバー6の鍔状大径部6cの軸心とが一致するように自動的に調心される。この第1調心機構10Aによってドローバー本体6aの前端部が、常に主軸本体3に対して自動的に調心される。
尚、主軸本体3の前端部には、工作機械の出荷前に主軸装置1のバランスを調整するためのネジ部材(錘)を取り付け可能な複数のネジ穴19が形成されている。
Since the spring receiving member 13 is always urged forward by the urging force of the spring member 8 in both the tool clamped state and the unclamped state, the first and second tapered surfaces 17 and 18 maintain the surface contact state. As a result, alignment is automatically performed so that the axial center of the main spindle body 3, the axial center of the spring receiving member 13, and the axial center of the bowl-shaped large-diameter portion 6c of the draw bar 6 coincide. The front end portion of the draw bar main body 6a is always automatically aligned with respect to the main spindle body 3 by the first alignment mechanism 10A.
A plurality of screw holes 19 to which screw members (weights) for adjusting the balance of the spindle device 1 can be attached before the machine tool is shipped are formed in the front end portion of the spindle body 3.
前記第2調心機構10Bは、主軸本体3の後部に固定された環状部材20と、環状の第3テーパ面21(主軸本体側テーパ面)と、ドローバー延長部材7(第2バネ受け部材)と、環状の第4テーパ面22(ドローバー側テーパ面)等で構成されている。前記環状部材20は、外周面に雄ネジ部が形成された筒状部材である。この環状部材20は円筒孔5の後部に形成された雌ネジ孔23に螺合固定されている。   The second alignment mechanism 10B includes an annular member 20 fixed to the rear part of the main spindle body 3, an annular third tapered surface 21 (main spindle main body side tapered surface), and a draw bar extending member 7 (second spring receiving member). And an annular fourth tapered surface 22 (drawbar side tapered surface) or the like. The annular member 20 is a cylindrical member having a male screw portion formed on the outer peripheral surface. The annular member 20 is screwed and fixed to a female screw hole 23 formed in the rear portion of the cylindrical hole 5.
この環状部材20の前端部分には、後方程小径化する第3テーパ面21が形成されている。前記ドローバー延長部材7は円筒孔5の後部のドローバー延長部材収容孔5cに径方向へ可動に内嵌され、ドローバー本体6aの後端部のネジ軸部6dがドローバー延長部材7のネジ孔に螺合にて固定されている。ドローバー延長部材7の途中部には、第3テーパ面21に面接触にて係合する第4テーパ面22が形成されている。第3,第4テーパ面21,22は研磨加工するのが望ましく、第3,第4テーパ面21,22が主軸本体3の軸心となす角度は約30〜45度とするのが望ましい。   A third tapered surface 21 is formed at the front end portion of the annular member 20 so as to decrease in diameter toward the rear. The draw bar extension member 7 is fitted in the draw bar extension member receiving hole 5c at the rear of the cylindrical hole 5 so as to be movable in the radial direction, and the screw shaft portion 6d at the rear end of the draw bar main body 6a is screwed into the screw hole of the draw bar extension member 7. It is fixed at the same time. A fourth tapered surface 22 that engages the third tapered surface 21 by surface contact is formed in the middle of the draw bar extending member 7. The third and fourth tapered surfaces 21 and 22 are preferably polished, and the angle formed by the third and fourth tapered surfaces 21 and 22 and the axis of the main spindle body 3 is preferably about 30 to 45 degrees.
工具ホルダを工具ホルダ装着用テーパ孔2に装着してない場合バネ部材8がドローバー延長部材7を後方へ付勢するため、ドローバー6は最大後退位置となる。その結果、第3,第4テーパ面21,22が面接触状態を維持するため、主軸本体3の軸心と、ドローバー延長部材7の軸心とが一致するように自動的に調心される。従って、第2調心機構10Bによってドローバー6の後端側部分が主軸本体3に対して自動的に調心される。
尚、工具ホルダを工具ホルダ装着用テーパ穴12に装着した場合、ドローバー6が最大後退位置よりも僅かに前方の位置になるため、第3,第4テーパ面21,22が面接触状態を維持しない。
When the tool holder is not mounted in the tool holder mounting taper hole 2, the spring member 8 biases the draw bar extending member 7 rearward, so that the draw bar 6 is in the maximum retracted position. As a result, since the third and fourth tapered surfaces 21 and 22 maintain the surface contact state, the shaft center of the main spindle body 3 is automatically aligned with the axis of the draw bar extension member 7. . Therefore, the rear end side portion of the draw bar 6 is automatically aligned with respect to the main spindle body 3 by the second alignment mechanism 10B.
When the tool holder is mounted in the tool holder mounting taper hole 12, the draw bar 6 is positioned slightly forward of the maximum retracted position, so that the third and fourth tapered surfaces 21, 22 maintain a surface contact state. do not do.
次に、切削加工の際、工具ホルダから切削個所へ向けて吐出するクーラント(冷却用液体)を供給するクーラント供給系について説明する。
前記ドローバー延長部材7の後端部に軸状部材24が固定されて後方へ延びており、この軸状部材24内に液通路25が形成されている。ドローバー延長部材7にも液通路26が形成され、ドローバー本体6aと連結軸部6bの内部にも液通路27,28が形成されている。チャック機構9の中心部にも液通路29が形成されている。クーラントは、外部のクーラント供給源からロータリ継手を介して液通路25に圧送され、その液通路25から液通路26,27,28を経て液通路29に供給される。
Next, a coolant supply system that supplies coolant (cooling liquid) to be discharged from the tool holder toward the cutting point during cutting will be described.
A shaft-shaped member 24 is fixed to the rear end portion of the draw bar extending member 7 and extends rearward. A liquid passage 25 is formed in the shaft-shaped member 24. A liquid passage 26 is also formed in the draw bar extension member 7, and liquid passages 27 and 28 are also formed in the draw bar main body 6 a and the connecting shaft portion 6 b. A liquid passage 29 is also formed in the central portion of the chuck mechanism 9. The coolant is pumped from the external coolant supply source to the liquid passage 25 through the rotary joint, and is supplied from the liquid passage 25 to the liquid passage 29 through the liquid passages 26, 27, and 28.
以上説明した主軸装置1の作用、効果について説明する。
工具ホルダを工具ホルダ装着用テーパ穴12に装着してない場合、ドローバー6は最大後退位置にあり、バネ受け部材13のフランジ部13fの前端面とドローバー6の鍔状大径部6cの後端面との間には隙間が発生する。バネ受け部材13はバネ部材8で前方へ付勢されて第1テーパ面17で受け止められるため、第1調心機構10Aの第1,第2テーパ面17,18が面接触にて係合する。そのため、この第1調心機構10Aにより、主軸本体3の軸心とドローバー6の鍔状大径部6cの軸心(つまり、ドローバー6の軸心)とが一致するように自動的に調心される。
The operation and effect of the spindle device 1 described above will be described.
When the tool holder is not mounted in the tool holder mounting taper hole 12, the draw bar 6 is in the maximum retracted position, and the front end surface of the flange portion 13f of the spring receiving member 13 and the rear end surface of the bowl-shaped large diameter portion 6c of the draw bar 6 There is a gap between the two. Since the spring receiving member 13 is urged forward by the spring member 8 and received by the first tapered surface 17, the first and second tapered surfaces 17 and 18 of the first aligning mechanism 10A are engaged by surface contact. . Therefore, the first alignment mechanism 10A automatically aligns so that the axis of the main spindle body 3 and the axis of the bowl-shaped large-diameter portion 6c of the draw bar 6 (that is, the axis of the draw bar 6) coincide. Is done.
しかも、第2調心機構10Bの第3,第4テーパ面21,22が面接触にて係合するため、この第2調心機構10Bにより、主軸本体3の軸心とドローバー延長部材7の軸心(つまり、ドローバー6の軸心)とが一致するように自動的に調心される。
この結果、工具ホルダを工具ホルダ装着用テーパ穴12に装着してない場合、ドローバー6の前部と後部において、主軸本体3の軸心とドローバー6の軸心とが一致するように自動的に調心されるため、工作機械の出荷前における主軸装置1のバランス調整の作業を省略することが可能となる。また、省略できないとしてもバランス調整の作業が著しく簡単になる。
Moreover, since the third and fourth tapered surfaces 21 and 22 of the second aligning mechanism 10B are engaged by surface contact, the second aligning mechanism 10B allows the shaft center of the main spindle body 3 and the drawbar extension member 7 to The axis is automatically aligned with the axis (that is, the axis of the draw bar 6).
As a result, when the tool holder is not mounted in the tool holder mounting taper hole 12, the axis of the main spindle body 3 and the axis of the draw bar 6 are automatically aligned at the front part and the rear part of the draw bar 6. Since the alignment is performed, it is possible to omit the work of adjusting the balance of the spindle device 1 before shipment of the machine tool. Further, even if it cannot be omitted, the balance adjustment operation is remarkably simplified.
工具ホルダを工具ホルダ装着用テーパ穴12に装着した場合、ドローバー6が最大後退位置によりも僅かに前方移動するだけであるから、バネ受け部材13の位置は前記の位置と同じ位置になるので、第1調心機構10Aによる前記同様の調心作用が得られる。
そのため、工作機械の稼働中における主軸装置1のバランスが良好に維持され、振動や騒音が軽減され、加工精度も向上する。
When the tool holder is mounted in the tool holder mounting taper hole 12, the draw bar 6 only moves slightly forward from the maximum retracted position, so the position of the spring receiving member 13 is the same as the above position. The same aligning action as described above by the first aligning mechanism 10A can be obtained.
Therefore, the balance of the spindle device 1 during operation of the machine tool is maintained well, vibration and noise are reduced, and machining accuracy is improved.
第1調心機構10Aは、主軸本体3に形成した第1テーパ面17とバネ受け部材13に形成した第2テーパ面18とで調心する構成であるから、バネ受け部材13を有効活用し部材数を増すことなく、簡単な構成のものにするから、安価に実施可能である。
第2調心機構10Bは、環状部材20に形成した第3テーパ面21と、ドローバー延長部材7に形成した第4テーパ面22とで調心する構成であるから、環状部材20を追加するものの、ドローバー延長部材7を有効活用して、簡単な構成のものにすることができるから、安価に実施可能である。
Since the first alignment mechanism 10A is configured to align with the first tapered surface 17 formed on the main spindle body 3 and the second tapered surface 18 formed on the spring receiving member 13, the spring receiving member 13 is effectively utilized. Since it has a simple configuration without increasing the number of members, it can be implemented at low cost.
Since the second aligning mechanism 10B is configured to align with the third tapered surface 21 formed on the annular member 20 and the fourth tapered surface 22 formed on the draw bar extending member 7, the annular member 20 is added. Since the draw bar extending member 7 can be effectively used to have a simple structure, it can be implemented at a low cost.
前記バネ部材8は、バネ受け部材13とドローバー延長部材7間において、ドローバー6に外装できる構成であればよいから、バネ部材8として、皿バネ、前部バネと後部バネとに分割した螺旋バネ叉は皿バネなど種々のバネ部材を採用可能である。   Since the spring member 8 only needs to be configured to be externally mounted on the draw bar 6 between the spring receiving member 13 and the draw bar extending member 7, the spring member 8 is a spiral spring divided into a disc spring, a front spring, and a rear spring. In addition, various spring members such as a disc spring can be employed.
ここで、前記実施例を部分的に変更する例について説明する。
1)主軸本体3をその外周側に組み込んだ主軸モータで駆動する形式の主軸装置にも、本発明を同様に適用することができる。
2)前記チャック機構9は一例を示すものに過ぎず、種々のチャック機構を組み込んだ主軸装置1にも、本発明を同様に適用することができる。
Here, the example which changes the said Example partially is demonstrated.
1) The present invention can be similarly applied to a spindle device of a type driven by a spindle motor in which the spindle body 3 is incorporated on the outer peripheral side thereof.
2) The chuck mechanism 9 is merely an example, and the present invention can be similarly applied to the spindle device 1 incorporating various chuck mechanisms.
3)アンクランプリング11が省略され、主軸本体3の後部または後方にクランプ解除用アクチュエータを装備した主軸装置1にも本発明を同様に適用することができる。
4)前記バネ部材8の代わりに、皿バネ積層体、または中間間座を挟んで前後に2分割した螺旋バネ叉は皿バネなどを採用することができる。
3) The present invention can be similarly applied to the spindle device 1 in which the unclamping ring 11 is omitted and a clamp release actuator is provided at the rear or rear of the spindle body 3.
4) Instead of the spring member 8, a disc spring laminated body or a spiral spring or a disc spring divided into two front and rear with an intermediate spacer interposed therebetween can be adopted.
本発明の実施例に係る主軸装置の断面図である。It is sectional drawing of the main axis | shaft apparatus which concerns on the Example of this invention. 前記主軸装置の前半部分の拡大断面図である。It is an expanded sectional view of the front half part of the spindle device. 前記主軸装置の後半部分の拡大断面図である。It is an expanded sectional view of the latter half part of the main spindle device. 主軸装置を装備した主軸ヘッドの要部断面図である。It is principal part sectional drawing of the spindle head equipped with the spindle apparatus. 図4のA矢視図である。It is A arrow directional view of FIG.
符号の説明Explanation of symbols
1 主軸装置
3 主軸本体
5 円筒孔
5a バネ部材収容孔
6 ドローバー
6c 鍔状大径部
7 ドローバー延長部材
8 バネ部材
10 調心機構
10A 第1調心機構
10B 第2調心機構
13 バネ受け部材
17,18 第1,第2テーパ面
20 環状部材
21,22 第3,第4テーパ面
DESCRIPTION OF SYMBOLS 1 Main axis | shaft apparatus 3 Main axis | shaft main body 5 Cylindrical hole 5a Spring member accommodation hole 6 Draw bar 6c Cage-like large diameter part 7 Draw bar extension member 8 Spring member 10 Alignment mechanism 10A First alignment mechanism 10B Second alignment mechanism 13 Spring receiving member 17 , 18 First and second tapered surfaces 20 Annular members 21, 22 Third and fourth tapered surfaces

Claims (6)

  1. 前端部に工具ホルダ装着用テーパ穴を形成した主軸本体と、この主軸本体の内部に組み込まれたドローバーと、このドローバーを後方へ弾性付勢するバネ部材とを備えた工作機械の主軸装置において、
    主軸本体の内部に形成されバネ部材を収容するバネ部材収容孔を含む円筒孔と、
    この円筒孔の前端部分と後部の少なくとも一方において、主軸本体に設けられた主軸本体側テーパ面とこの主軸本体側テーパ面に係合するドローバーに設けられたドローバー側テーパ面を介して、主軸本体の軸心とドローバーの軸心とを一致させる調心機構と、
    を備えたことを特徴とする工作機械の主軸装置。
    In a spindle device of a machine tool including a main spindle body in which a tapered hole for tool holder mounting is formed at a front end, a draw bar incorporated in the main spindle body, and a spring member that elastically biases the draw bar backward,
    A cylindrical hole including a spring member accommodation hole that is formed inside the main spindle body and accommodates the spring member;
    At least one of the front end portion and the rear portion of the cylindrical hole, the main spindle main body via the main spindle main body side tapered surface provided on the main spindle main body and the draw bar side tapered surface provided on the draw bar engaging with the main spindle main body side tapered surface. An alignment mechanism that matches the axis of the drawbar and the axis of the drawbar;
    A spindle device of a machine tool characterized by comprising:
  2. 前記調心機構は、前記円筒孔の前端部分において主軸本体の軸心とドローバーの軸心とを一致させる第1調心機構と、前記円筒孔の後部において主軸本体の軸心とドローバーの軸心とを一致させる第2調心機構とを有することを特徴とする請求項1に記載の工作機械の主軸装置。   The alignment mechanism includes a first alignment mechanism that aligns the axis of the main spindle body with the axis of the draw bar at the front end portion of the cylindrical hole, and the axis of the main spindle body and the axis of the draw bar at the rear of the cylindrical hole. The spindle device of the machine tool according to claim 1, further comprising: a second aligning mechanism that matches with the second aligning mechanism.
  3. 前記第1調心機構は、
    前記ドローバーに形成された鍔状大径部と、
    前記円筒孔に径方向へ可動に内嵌され且つ前記鍔状大径部に径方向へ移動不能に外嵌され且つ前記バネ部材の前端部を受け止める第1バネ受け部材と、
    前記円筒孔の前端部分の外周側部分に形成された前方程小径化する第1テーパ面と、 前記第1バネ受け部材の前端部分の外周側部分に形成されて前記第1テーパ面に係合する第2テーパ面とを備えたことを特徴とする請求項2に記載の工作機械の主軸装置。
    The first alignment mechanism includes:
    A bowl-shaped large-diameter portion formed on the draw bar;
    A first spring receiving member that is fitted in the cylindrical hole so as to be movable in the radial direction and is fitted in the flange-like large diameter portion so as not to move in the radial direction, and receives the front end portion of the spring member;
    A first tapered surface formed on the outer peripheral side portion of the front end portion of the cylindrical hole and having a smaller diameter toward the front; and formed on an outer peripheral side portion of the front end portion of the first spring receiving member and engaged with the first tapered surface. The spindle device for a machine tool according to claim 2, further comprising a second tapered surface.
  4. 前記第2調心機構は、
    前記円筒孔の内周部に固定され且つ前端部分に後方程小径化する第3テーパ面を有する環状部材と、
    前記円筒孔に径方向へ可動に内嵌され且つドローバーに固定されてバネ部材の後端部を受け止める第2バネ受け部材と、
    前記第2バネ受け部材に形成され且つ第3テーパ面に係合する第4テーパ面とを備えたことを特徴とする請求項2叉は3に記載の工作機械の主軸装置。
    The second alignment mechanism is
    An annular member having a third tapered surface fixed to the inner peripheral portion of the cylindrical hole and having a diameter that decreases toward the rear at the front end portion;
    A second spring receiving member fitted in the cylindrical hole movably in the radial direction and fixed to the draw bar to receive the rear end of the spring member;
    The spindle device for a machine tool according to claim 2 or 3, further comprising a fourth tapered surface formed on the second spring receiving member and engaged with the third tapered surface.
  5. 前記第1バネ受け部材はその後端部分に形成されたフランジ部を有し、このフランジ部の前端面と前記鍔状大径部の後端面との間には、工具ホルダを工具ホルダ装着用テーパ穴に装着していない状態においても隙間が形成されていることを特徴とする請求項3に記載の工作機械の主軸装置。   The first spring receiving member has a flange portion formed at a rear end portion thereof, and a tool holder is tapered between the front end surface of the flange portion and the rear end surface of the bowl-shaped large diameter portion. 4. The spindle device for a machine tool according to claim 3, wherein a gap is formed even when the hole is not attached to the hole.
  6. 前記環状部材は、前記主軸本体に内嵌状に螺合して固定されたことを特徴とする請求項4に記載の工作機械の主軸装置。   5. The spindle device for a machine tool according to claim 4, wherein the annular member is screwed and fixed to the spindle main body so as to fit inside.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106914636A (en) * 2015-12-25 2017-07-04 兄弟工业株式会社 Main shaft device and lathe
CN110586966A (en) * 2019-07-31 2019-12-20 广州市昊志机电股份有限公司 Pull rod structure and main shaft

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61172745A (en) * 1985-01-25 1986-08-04 Mannesmann Ag Matrix printing head
JPH01106111A (en) * 1987-10-19 1989-04-24 Fuji Photo Film Co Ltd Sequence monitoring method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61172745A (en) * 1985-01-25 1986-08-04 Mannesmann Ag Matrix printing head
JPH01106111A (en) * 1987-10-19 1989-04-24 Fuji Photo Film Co Ltd Sequence monitoring method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106914636A (en) * 2015-12-25 2017-07-04 兄弟工业株式会社 Main shaft device and lathe
CN110586966A (en) * 2019-07-31 2019-12-20 广州市昊志机电股份有限公司 Pull rod structure and main shaft

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