JP2014200904A - Internal grinder - Google Patents

Internal grinder Download PDF

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JP2014200904A
JP2014200904A JP2013081846A JP2013081846A JP2014200904A JP 2014200904 A JP2014200904 A JP 2014200904A JP 2013081846 A JP2013081846 A JP 2013081846A JP 2013081846 A JP2013081846 A JP 2013081846A JP 2014200904 A JP2014200904 A JP 2014200904A
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grinding wheel
workpiece
grinding
axis
shaft
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JP6107348B2 (en
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隼樹 酒井
Hayaki Sakai
隼樹 酒井
聡 大久保
Satoshi Okubo
聡 大久保
新野　康生
Yasuo Shinno
康生 新野
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JTEKT Corp
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Abstract

【課題】加工部の位置を測定する測定装置を用いることなく、被加工物の回転軸方向における加工部の位置精度を所望の値とできる内面研削盤を提供する。【解決手段】被加工物Ｗを回転させる主軸台５と、砥石車９を保持する砥石台７を備え、被加工物Ｗの内周面を研削する内面研削盤において、砥石台７の砥石車９が装着される側の端面に基準金１４を装着し、被加工物Ｗの端面を基準金１４に押し当てる。砥石車９を偏心して保持する砥石軸頭８を旋回させることにより、砥石車９を被加工物Ｗの半径方向へ移動させ被加工物Ｗに切込むように制御して、被加工物Ｗの内周面を研削する。【選択図】図２Provided is an internal grinding machine capable of setting a position accuracy of a processed part in a rotation axis direction of a workpiece to a desired value without using a measuring device for measuring the position of the processed part. In an internal grinding machine that includes a headstock 5 for rotating a workpiece W and a grinding wheel platform 7 that holds a grinding wheel 9, and grinds the inner peripheral surface of the workpiece W, the grinding wheel of the grinding wheel platform 7 is provided. The reference metal 14 is mounted on the end surface on the side where 9 is mounted, and the end surface of the workpiece W is pressed against the reference metal 14. By rotating the grinding wheel head 8 that eccentrically holds the grinding wheel 9, the grinding wheel 9 is controlled to move in the radial direction of the work W and cut into the work W. Grind the inner surface. [Selection] Figure 2

Description

本発明は、内面研削盤に関するものである。   The present invention relates to an internal grinding machine.

内面研削盤において、被加工物の回転軸方向における加工部の位置精度を高めることを目的として、加工部の位置を測定装置で測定して被加工物と砥石車の相対位置を制御することが行われている。（例えば、特許文献１参照）。   In an internal grinding machine, in order to increase the position accuracy of the processed part in the direction of the rotation axis of the work piece, the position of the processed part is measured by a measuring device to control the relative position of the work piece and the grinding wheel. Has been done. (For example, refer to Patent Document 1).

特開平３−２２８５７１号公報JP-A-3-228571

内面研削盤においては、被加工物を保持する主軸と砥石車を保持する砥石軸台はベッド上に支持されており、ベッド、主軸、砥石軸台の熱変位による位置誤差を生じる。この誤差を補正するために測定装置が用いられるが、加工部の位置を測定装置で測定して被加工物と砥石車の相対位置を制御するためには、測定をするための工程が必要であり、この工程の時間だけ加工時間が長くなる。   In an internal grinding machine, a main shaft for holding a workpiece and a grindstone head for holding a grinding wheel are supported on a bed, and a positional error is caused by thermal displacement of the bed, the main shaft, and the grindstone head. A measuring device is used to correct this error. However, in order to control the relative position between the workpiece and the grinding wheel by measuring the position of the processing part with the measuring device, a process for measuring is required. Yes, the processing time becomes longer by the time of this process.

本発明は上記事情に鑑みてなされたものであり、内面研削盤において、加工部の位置を測定する測定装置を用いることなく、被加工物の回転軸方向における加工部の位置精度を所望の値とできる内面研削盤を提供することを目的とする。   The present invention has been made in view of the above circumstances, and in the internal grinding machine, the position accuracy of the processed portion in the direction of the rotation axis of the workpiece is set to a desired value without using a measuring device that measures the position of the processed portion. It is an object of the present invention to provide an internal grinding machine that can be used.

上記の課題を解決するため、請求項１に係る発明の特徴は、主軸を回転自在に支持する主軸台と、前記主軸の回転軸線と平行な回転軸線を有し、砥石車を保持する砥石軸を備え、
前記砥石車の回転軸線を含む研削作用部の断面形状を、前記主軸により回転駆動される被加工物の内周面に転写して所望の形状に研削する内面研削盤において、
前記主軸に対して、軸方向には移動可能で回転方向には拘束され、前記被加工物を把持する把持装置と、
前記砥石軸を自らの旋回軸線に対して偏心して保持する砥石軸頭本体と、
前記砥石軸頭本体を旋回自在に支持する砥石台本体と、
前記砥石軸頭本体を旋回させることにより、前記砥石軸を前記被加工物の半径方向へ移動させる砥石車切込み手段と、
前記砥石台本体の前記砥石車が保持される側の端面に装着され、前記把持装置と対向する基準金と、
前記把持装置を前記基準金の方向へ押し当てる押付手段と、
前記押付手段により前記被加工物を前記基準金に押し当て、前記砥石車切込み手段により前記砥石車を前記被加工物に切込むように、前記主軸と前記砥石軸と前記押付手段と前記砥石車切込み手段を制御して内面研削を行う制御装置を備え、
前記所望の形状の所定部位と前記被加工物の前記基準金と接触する端面の間の前記砥石軸線方向の距離は、前記所定部位を研削する前記砥石車の部位と前記基準金の前記被加工物との接触面の間の前記砥石軸線方向の距離と等しいことである。 In order to solve the above-mentioned problem, a feature of the invention according to claim 1 is that a grinding wheel shaft having a spindle head that rotatably supports the spindle, a rotation axis parallel to the rotation axis of the spindle, and holding the grinding wheel With
In an internal grinding machine that transfers the cross-sectional shape of the grinding action portion including the rotation axis of the grinding wheel to the inner peripheral surface of the workpiece that is rotationally driven by the main shaft and grinds it to a desired shape,
A gripping device that is movable in the axial direction and restrained in the rotational direction with respect to the main shaft, and grips the workpiece;
A grindstone head body that holds the grindstone shaft eccentrically with respect to its own turning axis; and
A grinding wheel head main body that rotatably supports the grinding wheel head body;
Grinding wheel cutting means for moving the grinding wheel shaft in the radial direction of the workpiece by turning the grinding wheel head body;
A reference metal mounted on an end surface of the grinding wheel base body on the side where the grinding wheel is held, and facing the gripping device,
Pressing means for pressing the gripping device in the direction of the reference metal;
The main shaft, the grinding wheel shaft, the pressing means, and the grinding wheel so that the workpiece is pressed against the reference metal by the pressing means, and the grinding wheel is cut into the workpiece by the grinding wheel cutting means. Provided with a control device that performs internal grinding by controlling the cutting means,
The distance in the grinding wheel axis direction between the predetermined portion of the desired shape and the end surface of the workpiece that contacts the reference gold is determined by the grinding wheel portion grinding the predetermined portion and the workpiece of the reference gold. It is equal to the distance of the grindstone axis direction between the contact surfaces with a thing.

請求項２に係る発明の特徴は、請求項１に関わる発明において、前記砥石軸の軸方向の位置の基準と前記砥石軸頭本体の軸方向の位置の基準が、前記基準金の近傍に配置されることである。   The invention according to claim 2 is characterized in that, in the invention according to claim 1, the reference of the axial position of the grinding wheel shaft and the reference of the axial position of the grinding wheel head body are arranged in the vicinity of the reference gold. It is to be done.

請求項３に係る発明の特徴は、請求項１または請求項２に関わる発明において、前記基準金は、前記主軸の回転軸線と同軸の軸心回りに回転可能に支持されることである。   A feature of the invention according to claim 3 is that, in the invention according to claim 1 or claim 2, the reference metal is supported so as to be rotatable about an axis coaxial with the rotation axis of the main shaft.

請求項1に係る発明によれば、被加工物に転写された所望の形状の所定部位と被加工物の基準金との接触する端面の前記砥石軸線方向の間の距離は、所定部位を研削する砥石車の部位と基準金の被加工物と接触する面の間の砥石軸線方向の距離のみで決定される。砥石車と基準金は、ベッドを介することなく同一の砥石台に装着されているため、砥石車と基準金の温度差が少ない。このため、砥石車と基準金の間の砥石軸線方向の距離の熱による変動が小さくなる。結果として、被加工物の軸方向寸法誤差が小さい内面研削盤を実現できる。   According to the invention of claim 1, the distance between the predetermined portion of the desired shape transferred to the workpiece and the end surface of the workpiece in contact with the reference metal is in the direction of the grinding wheel axis. This is determined only by the distance in the direction of the grinding wheel axis between the portion of the grinding wheel to be touched and the surface of the reference gold that contacts the workpiece. Since the grinding wheel and the reference gold are mounted on the same grinding wheel base without using a bed, there is little temperature difference between the grinding wheel and the reference gold. For this reason, the fluctuation | variation by the heat | fever of the distance of the grinding wheel axis direction between a grinding wheel and a reference metal becomes small. As a result, an internal grinding machine with a small axial dimensional error of the workpiece can be realized.

請求項２に係る発明によれば、砥石車と偏心軸の軸方向の基準位置が基準金の近傍に配置されるので、砥石車と基準金の軸方向の距離が短いので、熱変位による誤差がさらに小さい内面研削盤を実現できる。   According to the second aspect of the present invention, since the axial reference position between the grinding wheel and the eccentric shaft is arranged in the vicinity of the reference gold, the distance between the grinding wheel and the reference gold in the axial direction is short. Can achieve an internal grinder with even smaller.

請求項３に係る発明によれば、研削加工時に基準金が被加工物と共に回転するので、基準金の磨耗が小さい内面研削盤を実現できる。   According to the invention which concerns on Claim 3, since a reference | standard gold | metal rotates with a to-be-processed object at the time of a grinding process, the internal grinding machine with small abrasion of a reference | standard gold | metal | money is realizable.

本実施形態の内面研削盤の全体構成を示す概略平面図である。It is a schematic plan view which shows the whole structure of the internal grinding machine of this embodiment. 図１のＡ−Ａ断面矢視図である。It is an AA cross-sectional arrow view of FIG. 本実施形態の砥石軸部の詳細を示す断面図である。It is sectional drawing which shows the detail of the grindstone shaft part of this embodiment. 図３のＢ−Ｂ断面矢視図である。It is a BB cross-sectional arrow view of FIG. 本実施形態の研削工程を示すフローチャート図である。It is a flowchart figure which shows the grinding process of this embodiment. 本実施形態の研削加工時の主軸台と砥石台の相対位置を表す平面図である。It is a top view showing the relative position of a headstock and a grindstone table at the time of grinding processing of this embodiment. 本実施形態の研削時の砥石車と被加工物の相対位置を表す断面図である。It is sectional drawing showing the relative position of the grinding wheel and workpiece during grinding of this embodiment. 本実施形態の砥石車の被加工物への切り込み状態を表す図である。It is a figure showing the cutting state to the workpiece of the grinding wheel of this embodiment.

以下、本発明の実施の形態を説明する。
図１に示すように、内面研削盤１は、ベッド２を備え、ベッド２上にベース３を備え、ベース３上にはベース３によりＸ軸方向に往復可能に支持され、モータ１２で往復駆動されるテーブル４を備えている。さらに、テーブル４上にはＸ軸に直交するＺ軸方向にモータ１３により往復駆動される主軸台５を備えている。主軸台５は、被加工物Ｗを把持する把持装置６を回転自在に支持し、Ｚ軸と平行な軸線周りに回転駆動する。主軸台５の側面には、ドレスロール１１を回転駆動するドレス１０が配置されている。
また、ベッド２上には、砥石車９を回転自在に支持する砥石台７が、砥石車９の回転軸線がＺ軸と平行になるように固定されている。 Embodiments of the present invention will be described below.
As shown in FIG. 1, the internal grinding machine 1 includes a bed 2, a base 3 on the bed 2, supported on the base 3 so as to reciprocate in the X-axis direction, and reciprocally driven by a motor 12. The table 4 is provided. Further, on the table 4, a headstock 5 that is reciprocally driven by a motor 13 in the Z-axis direction orthogonal to the X-axis is provided. The headstock 5 rotatably supports a gripping device 6 that grips the workpiece W, and rotates around an axis parallel to the Z axis. A dress 10 that rotationally drives the dress roll 11 is disposed on the side surface of the head stock 5.
On the bed 2, a grinding wheel base 7 that rotatably supports the grinding wheel 9 is fixed so that the rotational axis of the grinding wheel 9 is parallel to the Z axis.

この内面研削盤１は、所定のプログラムを実行することで研削加工や砥石成形を実行する制御装置３０を備えている。制御装置３０の機能的構成として、テーブル４の送りを制御するＸ軸制御装置３０１、主軸台５の送りを制御するＺ軸制御装置３０２、砥石軸の旋回切込みを制御するＵ軸制御装置３０３、砥石車９の回転を制御する砥石車制御装置３０４、主軸５１の回転を制御する主軸制御装置３０５、ドレス１０を制御するドレス制御装置３０６などを具備している。   The internal grinding machine 1 includes a control device 30 that executes grinding processing and grinding wheel forming by executing a predetermined program. As a functional configuration of the control device 30, an X-axis control device 301 that controls the feed of the table 4, a Z-axis control device 302 that controls the feed of the headstock 5, a U-axis control device 303 that controls the turning cutting of the grinding wheel shaft, A grinding wheel control device 304 that controls the rotation of the grinding wheel 9, a spindle control device 305 that controls the rotation of the spindle 51, a dress control device 306 that controls the dress 10, and the like.

図２に基づき、砥石台７の詳細について説明する。
ベッド２上に固定された砥石台本体７０に備えた静圧軸受７０ａ、７０ｂにより、砥石車９を回転自在に支持する砥石軸頭８（詳細は後に説明する）を、Ｚ軸と平行な軸線周りに旋回自在に支持している。また、砥石台本体７０の砥石車９の装着される側の端部には、砥石軸頭８の軸方向の基準位置となる静圧スラスト軸受７０ｃを備えており、反対の端面にはプレート７４を備えている。砥石台本体７０、砥石軸頭８、プレート７４により液圧室７８を構成している。
静圧軸受７０ａ、７０ｂ、静圧スラスト軸受７０ｃ、液圧室７８には、流路７０ｄを経由して、図示しない圧油供給装置から圧油が供給される。これにより、砥石軸頭８は、回転自在に支持されると共に、液圧室７８の圧力により静圧スラスト軸受７０ｃに押付けられる。
砥石軸頭８の外周の軸方向の中央部には歯車７１が固定されており、歯車７１は、外周に歯車を備えたピニオン７２と噛合っており、ピニオン７２は砥石台本体７０により回転自在に支持され、モータ７３で回転駆動される。
砥石台７は、以上の構成を備えており、砥石台本体７０の砥石車９の装着される側の端面には、主軸の回転軸線と垂直な平面１４ａを備えた基準金１４が装着されている。 Based on FIG. 2, the detail of the grindstone base 7 is demonstrated.
A grinding wheel head 8 (details will be described later) that supports the grinding wheel 9 rotatably by means of hydrostatic bearings 70a, 70b provided on the grinding wheel base body 70 fixed on the bed 2 is an axis parallel to the Z axis. It is supported so that it can swivel around. Further, an end portion of the grinding wheel head main body 70 on the side where the grinding wheel 9 is mounted is provided with a static pressure thrust bearing 70c serving as a reference position in the axial direction of the grinding wheel head 8, and a plate 74 is provided on the opposite end surface. It has. A hydraulic chamber 78 is constituted by the grinding wheel base 70, the grinding wheel head 8, and the plate 74.
The hydrostatic bearings 70a and 70b, the hydrostatic thrust bearing 70c, and the hydraulic pressure chamber 78 are supplied with pressure oil from a pressure oil supply device (not shown) via the flow path 70d. As a result, the grindstone shaft head 8 is rotatably supported and is pressed against the hydrostatic thrust bearing 70 c by the pressure of the hydraulic chamber 78.
A gear 71 is fixed to an axially central portion of the outer periphery of the grindstone head 8, and the gear 71 meshes with a pinion 72 having a gear on the outer periphery, and the pinion 72 is freely rotatable by a grindstone base body 70. And is rotationally driven by a motor 73.
The grinding wheel base 7 has the above-described configuration, and a reference metal 14 having a flat surface 14a perpendicular to the rotation axis of the main shaft is attached to the end surface of the grinding wheel base body 70 on the side where the grinding wheel 9 is mounted. Yes.

図２に基づき、主軸台５と把持装置６の詳細について説明する。
主軸台５は主軸５１を回転自在に支持している。被加工物Ｗを把持する把持装置６は、主軸５１に対して回転は拘束され軸方向には所定の距離だけ移動可能に支持されている。把持装置６は、皿ばね５２により主軸５１の先端側に所定の力で押付けられている。
砥石車９と把持装置６は、被加工物Ｗの内径に砥石車９が挿入可能な相対位置に配置されている。また、基準金１４は、被加工物Ｗの端面が基準金１４の平面１４ａに接触可能な位置に配置されている。 The details of the headstock 5 and the gripping device 6 will be described with reference to FIG.
The head stock 5 supports a main shaft 51 in a rotatable manner. The gripping device 6 that grips the workpiece W is supported so as to be able to move by a predetermined distance in the axial direction while being restricted from rotating with respect to the main shaft 51. The gripping device 6 is pressed against the distal end side of the main shaft 51 by a disc spring 52 with a predetermined force.
The grinding wheel 9 and the gripping device 6 are arranged at a relative position where the grinding wheel 9 can be inserted into the inner diameter of the workpiece W. Further, the reference gold 14 is arranged at a position where the end surface of the workpiece W can contact the flat surface 14 a of the reference gold 14.

図３に基づき砥石軸頭８の詳細について説明する。
砥石軸頭本体８０は、砥石軸８１を砥石軸頭本体８０の内周面に備えた静圧軸受８０ａ、８０ｂにより回転自在に支持する。砥石軸８１は一端にフランジ部８１ａを備えこの端面には砥石車９を装着可能なねじを備えている、また、他端部にはスラストリング８２が装着され他端の終端部にはモータ８３のロータが連結されている。また、砥石軸頭本体８０の砥石車９の装着される側の端部には、砥石軸８１の軸方向の基準位置となる静圧スラスト軸受８０ｃを備えている。砥石軸頭本体８０、砥石軸８１、スラストリング８２により液圧室８４を構成している。
静圧軸受８０ａ、８０ｂ、静圧スラスト軸受８０ｃ、液圧室８４には、流路８０ｄと溝７０ｅと流路７０ｄを経由して、図示しない圧油供給装置から圧油が供給される。これにより、砥石軸８１は、回転自在に支持されると共に、液圧室８４の圧力によりモータ取り付け方向に作用する力を受け、フランジ部８１ａは静圧スラスト軸受８０ｃに押付けられている。 The details of the grindstone head 8 will be described with reference to FIG.
The grindstone shaft head main body 80 rotatably supports the grindstone shaft 81 by hydrostatic bearings 80 a and 80 b provided on the inner peripheral surface of the grindstone shaft head main body 80. The grindstone shaft 81 is provided with a flange portion 81a at one end thereof, and is provided with a screw to which the grindstone 9 can be attached at its end face, a thrust ring 82 is attached at the other end portion, and a motor 83 is provided at the other end portion. The rotors are connected. Further, a hydrostatic thrust bearing 80 c serving as a reference position in the axial direction of the grinding wheel shaft 81 is provided at an end of the grinding wheel head body 80 on the side where the grinding wheel 9 is mounted. A hydraulic chamber 84 is constituted by the grinding wheel head body 80, the grinding wheel shaft 81, and the thrust ring 82.
The hydrostatic bearings 80a and 80b, the hydrostatic thrust bearing 80c, and the hydraulic chamber 84 are supplied with pressure oil from a pressure oil supply device (not shown) via the flow path 80d, the groove 70e, and the flow path 70d. Thereby, the grindstone shaft 81 is rotatably supported and receives a force acting in the motor mounting direction by the pressure of the hydraulic chamber 84, and the flange portion 81a is pressed against the hydrostatic thrust bearing 80c.

ここで、砥石軸頭本体８０の外周面と静圧軸受８０ａ、８０ｂの内周面は、偏心しており偏心量はｅである。このため、図３のＢ−Ｂ断面矢視図である図４に示すように、砥石軸頭本体８０の回転軸線Ｐと砥石軸８１の回転軸線Ｑも偏心しており偏心量はｅである。砥石軸頭本体８０には歯車７１が固定されおり、その歯面がピニオン７２の歯面と噛合っている。このため、ピニオン７２が回転すると砥石軸頭本体８０が回転し、砥石軸８１の回転軸線Ｑは回転軸線Ｐの周りを半径ｅの円周を描き旋回する。この旋回運動をＵ軸と称する。主軸５１の回転軸線と砥石車９の回転軸線Ｑが同軸になるのは、水平線に対して点Ｐと点Ｑを結ぶ線が角度Θ０をなすときであり、この位置をＵ軸加工原点と称する。 Here, the outer peripheral surface of the grindstone head body 80 and the inner peripheral surfaces of the hydrostatic bearings 80a and 80b are eccentric, and the amount of eccentricity is e. Therefore, as shown in FIG. 4, which is a cross-sectional view taken along the line B-B of FIG. 3, the rotation axis P of the grindstone head body 80 and the rotation axis Q of the grindstone shaft 81 are also eccentric, and the amount of eccentricity is e. A gear 71 is fixed to the grinding wheel head body 80, and the tooth surface thereof meshes with the tooth surface of the pinion 72. Therefore, when the pinion 72 rotates, the grindstone shaft head main body 80 rotates, and the rotation axis Q of the grindstone shaft 81 turns around the rotation axis P with a circumference of a radius e. This turning motion is referred to as the U axis. The rotation axis of the main shaft 51 and the rotation axis Q of the grinding wheel 9 are coaxial when the line connecting the point P and the point Q with respect to the horizontal line forms an angle Θ 0 , and this position is the U-axis machining origin. Called.

内面研削盤１による研削方法を、図５のフローチャートに基づき説明する。
はじめに、工作物搬入出位置において被加工物Ｗを把持装置６に装着する。工作物搬入出位置は図６の（ａ）図に示す位置である（Ｓ１）。テーブル４をＸ軸方向へ送り、図６の（ｂ）図に示すように、被加工物Ｗと砥石車９の回転軸線が同軸となるＸ軸加工開始位置へ主軸台５を位置決めする（Ｓ２）。主軸台５をＺ軸方向へ送り、被加工物Ｗと基準金１４が接触した後、さらに、所定の距離だけ皿ばね５２を圧縮するＺ軸加工開始位置へ主軸台５を位置決めする。Ｚ軸加工開始位置は図６の（ｃ）図に示す位置である。この時、図７に示すように、把持装置６は皿ばね５２により所定の力で被加工物Ｗを基準金１４に押し付け、その力は皿ばね５２の復元力となる。この状態で、主軸台５と砥石軸台７の間で熱変位等による相対位置変動があっても、その変動は皿ばね５２の伸縮で吸収される。このため、被加工物の端面からの加工部の最大径の位置の軸方向の距離ｍは、基準面１４ａと砥石車９の最大径の位置の距離ｎに等しくなる。（Ｓ３）。 A grinding method by the internal grinding machine 1 will be described based on the flowchart of FIG.
First, the workpiece W is mounted on the gripping device 6 at the workpiece loading / unloading position. The workpiece loading / unloading position is the position shown in FIG. 6 (a) (S1). The table 4 is fed in the X-axis direction, and the headstock 5 is positioned at the X-axis machining start position where the rotational axis of the workpiece W and the grinding wheel 9 is coaxial as shown in FIG. 6B (S2). ). After the spindle stock 5 is fed in the Z-axis direction and the workpiece W and the reference metal 14 contact each other, the spindle stock 5 is positioned at the Z-axis machining start position where the disc spring 52 is compressed by a predetermined distance. The Z-axis machining start position is the position shown in FIG. At this time, as shown in FIG. 7, the gripping device 6 presses the workpiece W against the reference metal 14 with a predetermined force by the disc spring 52, and the force becomes a restoring force of the disc spring 52. In this state, even if there is a relative position fluctuation due to thermal displacement or the like between the head stock 5 and the grindstone stock 7, the fluctuation is absorbed by the expansion and contraction of the disc spring 52. For this reason, the distance m in the axial direction of the position of the maximum diameter of the processed part from the end surface of the workpiece is equal to the distance n of the position of the maximum diameter of the reference surface 14a and the grinding wheel 9. (S3).

主軸５１を回転させて、被加工物Ｗを回転させる（Ｓ４）。砥石車９をＵ軸方向へ送り、被加工物Ｗに切込む。図４において、モータ７３によりピニオン７２を左回転させて、歯車７１を介して砥石軸頭本体８０を所定の角度Θ１まで右回りに回転させる。これにより、図８の（ｂ）図に示すように、砥石車９はＵ軸方向へ旋回し、被加工物Ｗの内周面に切込まれ、被加工物Ｗの内径溝を所定の径に研削する（Ｓ５）。砥石車９をＵ軸加工原点へ戻す。モータ７３によりピニオン７２を右回転させて、歯車７１を介して砥石軸頭本体８０を所定の角度Θ０まで左回りに回転させる。これにより、図８の（ａ）図に示すように、砥石車９は被加工物Ｗと同軸上のＵ軸加工原点に位置決めされる（Ｓ６）。主軸台５をＺ軸方向で砥石軸台から離れる方法へ送り、図５の（ｂ）図の位置に位置決めする（Ｓ７）。テーブル４をＸ軸方向へ送り、図６の（ａ）図に示す工作物搬入出位置に位置決めし、工作物を取り出す（Ｓ８）。 The spindle 51 is rotated to rotate the workpiece W (S4). The grinding wheel 9 is fed in the U-axis direction and cut into the workpiece W. In FIG. 4, the pinion 72 is rotated counterclockwise by the motor 73, and the grinding wheel head body 80 is rotated clockwise to a predetermined angle Θ 1 via the gear 71. As a result, as shown in FIG. 8B, the grinding wheel 9 turns in the U-axis direction and is cut into the inner peripheral surface of the workpiece W so that the inner diameter groove of the workpiece W has a predetermined diameter. (S5). Return the grinding wheel 9 to the U-axis machining origin. The pinion 72 is rotated clockwise by the motor 73, and the grindstone head body 80 is rotated counterclockwise to a predetermined angle Θ 0 via the gear 71. Accordingly, as shown in FIG. 8A, the grinding wheel 9 is positioned at the U-axis machining origin coaxial with the workpiece W (S6). The headstock 5 is sent to the method of moving away from the grinding wheel headstock in the Z-axis direction, and is positioned at the position shown in FIG. 5B (S7). The table 4 is fed in the X-axis direction, positioned at the workpiece loading / unloading position shown in FIG. 6A, and the workpiece is taken out (S8).

以上のように、本実施事例の内面研削盤１を用いて研削を行うと、被加工物Ｗの端面から溝の最大径の位置までの寸法は、基準金１４の平面１４ａから砥石車９の最大径の位置までの距離ｍで決まる。すなわち、ベッド２や主軸台５などの部位の熱変位などによる誤差の影響を受けないで研削ができる。
また、基準金１４と、砥石軸頭本体８０の軸方向の位置の基準である静圧スラスト軸受７０ｃと、砥石軸８１の軸方向の位置の基準である静圧スラスト軸受７０ｃの砥石軸方向の距離が近いため、基準金１４と砥石軸８１の間の熱変位は小さくなる。
以上より、本実施事例の内面研削盤１を用いると、測定装置を用いることなく、被加工物Ｗの軸方向の加工位置を所望の精度に研削することができる。 As described above, when grinding is performed using the inner surface grinding machine 1 of the present embodiment, the dimension from the end surface of the workpiece W to the position of the maximum diameter of the groove is from the flat surface 14a of the reference metal 14 to the grinding wheel 9. It is determined by the distance m to the position of the maximum diameter. That is, grinding can be performed without being affected by errors due to thermal displacements of parts such as the bed 2 and the headstock 5.
In addition, the reference pressure 14, the hydrostatic thrust bearing 70c that is a reference for the axial position of the grinding wheel head body 80, and the hydrostatic thrust bearing 70c that is the reference for the axial position of the grinding wheel shaft 81 in the grinding wheel axis direction. Since the distance is short, the thermal displacement between the reference metal 14 and the grindstone shaft 81 is small.
As described above, when the internal grinding machine 1 of the present embodiment is used, the machining position in the axial direction of the workpiece W can be ground with a desired accuracy without using a measuring device.

上記実施例では、基準金１４を砥石台本体７０に固定したが、主軸台５の回転軸線と同軸で回転できるように支持してもよい。この場合、被加工物と基準金の間の相対すべりがなくなり、摩擦による発熱や、基準金の消耗を防止できる。   In the above embodiment, the reference metal 14 is fixed to the grindstone base body 70, but it may be supported so that it can rotate coaxially with the rotation axis of the headstock 5. In this case, there is no relative slip between the workpiece and the reference gold, and heat generation due to friction and consumption of the reference gold can be prevented.

Ｗ：被加工物 ２：ベッド ３：ベース ４：テーブル ５：主軸台 ６：把持装置 ７：砥石台 ８：砥石軸頭 ９：砥石車 １４：基準金 ７０ｃ：静圧スラスト軸受 ７１：歯車 ７２：ピニオン ３０：制御装置 ３０１：Ｘ軸制御装置 ３０２：Ｚ軸制御装置 ３０３：Ｕ軸制御装置 ３０４：砥石軸制御装置 ３０５：主軸制御装置 W: Workpiece 2: Bed 3: Base 4: Table 5: Main spindle 6: Gripping device 7: Grinding wheel base 8: Grinding wheel head 9: Grinding wheel 14: Reference gold 70c: Hydrostatic thrust bearing 71: Gear 72: Pinion 30: Controller 301: X-axis controller 302: Z-axis controller 303: U-axis controller 304: Wheel axis controller 305: Spindle controller

Claims (3)

主軸を回転自在に支持する主軸台と、前記主軸の回転軸線と平行な回転軸線を有し、砥石車を保持する砥石軸を備え、
前記砥石車の回転軸線を含む研削作用部の断面形状を、前記主軸により回転駆動される被加工物の内周面に転写して所望の形状に研削する内面研削盤において、
前記主軸に対して、軸方向には移動可能で回転方向には拘束され、前記被加工物を把持する把持装置と、
前記砥石軸を自らの旋回軸線に対して偏心して保持する砥石軸頭本体と、
前記砥石軸頭本体を旋回自在に支持する砥石台本体と、
前記砥石軸頭本体を旋回させることにより、前記砥石軸を前記被加工物の半径方向へ移動させる砥石車切込み手段と、
前記砥石台本体の前記砥石車が保持される側の端面に装着され、前記把持装置と対向する基準金と、
前記把持装置を前記基準金の方向へ押し当てる押付手段と、
前記押付手段により前記被加工物を前記基準金に押し当て、前記砥石車切込み手段により前記砥石車を前記被加工物に切込むように、前記主軸と前記砥石軸と前記押付手段と前記砥石車切込み手段を制御して内面研削を行う制御装置を備え、
前記所望の形状の所定部位と前記被加工物の前記基準金と接触する端面の間の前記砥石軸線方向の距離は、前記所定部位を研削する前記砥石車の部位と前記基準金の前記被加工物との接触面の間の前記砥石軸線方向の距離と等しい内面研削盤。 A spindle stock that rotatably supports the spindle, a rotation axis parallel to the rotation axis of the spindle, and a grinding wheel shaft that holds the grinding wheel,
In an internal grinding machine that transfers the cross-sectional shape of the grinding action portion including the rotation axis of the grinding wheel to the inner peripheral surface of the workpiece that is rotationally driven by the main shaft and grinds it to a desired shape,
A gripping device that is movable in the axial direction and restrained in the rotational direction with respect to the main shaft, and grips the workpiece;
A grindstone head body that holds the grindstone shaft eccentrically with respect to its own turning axis; and
A grinding wheel head main body that rotatably supports the grinding wheel head body;
Grinding wheel cutting means for moving the grinding wheel shaft in the radial direction of the workpiece by turning the grinding wheel head body;
A reference metal mounted on an end surface of the grinding wheel base body on the side where the grinding wheel is held, and facing the gripping device,
Pressing means for pressing the gripping device in the direction of the reference metal;
The main shaft, the grinding wheel shaft, the pressing means, and the grinding wheel so that the workpiece is pressed against the reference metal by the pressing means, and the grinding wheel is cut into the workpiece by the grinding wheel cutting means. Provided with a control device that performs internal grinding by controlling the cutting means,
The distance in the grinding wheel axis direction between the predetermined portion of the desired shape and the end surface of the workpiece that contacts the reference gold is determined by the grinding wheel portion grinding the predetermined portion and the workpiece of the reference gold. An internal grinder equal to the distance in the grinding wheel axis direction between the contact surfaces with the object. 前記砥石軸の軸方向の位置の基準と前記砥石軸頭本体の軸方向の位置の基準が、前記基準金の近傍に配置される請求項１に記載の内面研削盤。   2. The internal grinding machine according to claim 1, wherein a reference for the axial position of the grinding wheel shaft and a reference for the axial position of the grinding wheel head body are arranged in the vicinity of the reference metal. 前記基準金は、前記主軸の回転軸線と同軸の軸心回りに回転可能に支持される請求項１または請求項２に記載の内面研削盤。   The internal grinding machine according to claim 1 or 2, wherein the reference gold is supported so as to be rotatable about an axis coaxial with a rotation axis of the main shaft.
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