JP2022186260A - Grindstone oscillator and super-finishing device for screw shaft - Google Patents

Grindstone oscillator and super-finishing device for screw shaft Download PDF

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JP2022186260A
JP2022186260A JP2021094396A JP2021094396A JP2022186260A JP 2022186260 A JP2022186260 A JP 2022186260A JP 2021094396 A JP2021094396 A JP 2021094396A JP 2021094396 A JP2021094396 A JP 2021094396A JP 2022186260 A JP2022186260 A JP 2022186260A
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grindstone
whetstone
hole
screw shaft
oscillating
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JP7518538B2 (en
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研二 越智
Kenji Ochi
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Seibu Jido Kiki Co Ltd
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Seibu Jido Kiki Co Ltd
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Abstract

To provide a grindstone oscillator that can actually perform super-finishing processing for a Gothic arc groove in a screw shaft of a ball screw.SOLUTION: A grindstone oscillator 1 comprises a grindstone holding part 23, a grindstone pressing part 24 and an oscillating motor 21. The grindstone holding part comprises a penetrating grindstone hole 27 for storing a grindstone St that is used for super-finishing and a grindstone dropout preventing device 28 that prevents the grindstone from dropping off from the grindstone hole. The grindstone pressing part comprises a cylinder device 36 that presses the grindstone stored in the grindstone hole toward one side in a penetrating direction of the grindstone hole. The oscillating motor is configured to oscillate the grindstone holding part and the grindstone pressing part integrally with a direction orthogonal to the penetrating direction of the grindstone hole as an oscillation shaft Cs.SELECTED DRAWING: Figure 5

Description

本発明は、ボールネジのネジ軸の溝を超仕上する装置に関する。 The present invention relates to an apparatus for superfinishing the groove of the screw shaft of a ball screw.

ボールネジは、直線運動を回転運動または回転運動を直線運動に変換する機械要素であり、半導体製造装置および工作機械等の工業用装置、航空宇宙機器および自動車等の運搬機器、ならびに、医療機器およびロボット等を含め、その利用分野は極めて広い。
ボールネジはサーボモータと組み合わされて使用されることが多く、高い動作精度が求められる。また、ボールネジは動作音をより低くすることが求められ、そのためボールネジを構成するネジ軸、ナットおよびボールの摺動面は平滑であることが好ましい。 A ball screw is a machine element that converts linear motion to rotary motion or rotary motion to linear motion, and is used in industrial equipment such as semiconductor manufacturing equipment and machine tools, transportation equipment such as aerospace equipment and automobiles, as well as medical equipment and robots. The field of application is extremely wide, including
Ball screws are often used in combination with servo motors, and require high operational accuracy. In addition, the ball screw is required to have lower operating noise, and therefore, it is preferable that the sliding surfaces of the screw shaft, the nut, and the balls constituting the ball screw are smooth.

ボールネジの構成要素の一つであるネジ軸の平滑化について、ネジ軸のゴシックアーク溝との接触により事前に成形された砥石を、ゴシックアーク溝断面形状に対する特定の揺動軸回りに揺動させ、溝内の２つの曲面（フランク）を同時に超仕上する方法が提案されている（特許文献１）。
ネジ軸のゴシックアーク溝の超仕上において、砥石のまたぎ幅方向の各半分をそれぞれ異なるフランクに接触させ、溝内で揺動する砥石とゴシックアーク溝とが連続した接触加工線となるように揺動軸の傾斜角および揺動軸の位置を設定する方法も提案されている（特許文献２）。 For the smoothing of the screw shaft, which is one of the constituent elements of the ball screw, the grindstone preformed by contact with the gothic arc groove of the screw shaft is oscillated around a specific oscillating axis with respect to the cross-sectional shape of the gothic arc groove. , a method of simultaneously superfinishing two curved surfaces (flanks) in a groove has been proposed (Patent Document 1).
In the superfinishing of the gothic arc groove of the screw shaft, each half of the whetstone in the straddling width direction is brought into contact with different flanks, and the whetstone and the gothic arc groove oscillating in the groove are rocked so as to form a continuous contact processing line. A method of setting the tilt angle of the driving shaft and the position of the swing shaft has also been proposed (Patent Document 2).

特開２００３－１４５４１０号公報Japanese Patent Application Laid-Open No. 2003-145410 特開２００３－１５９６４１号公報Japanese Patent Application Laid-Open No. 2003-159641

しかし、特許文献１および特許文献２におけるゴシックアーク溝の超仕上方法は、主に砥石の揺動軸とゴシックアーク溝との好適な位置関係を提案するもので、この好適な砥石の揺動軸の位置決定に基づいてゴシックアーク溝の超仕上処理を実現する装置については、具体的に提示されていない。
本発明は、上述の問題に鑑みてなされたもので、ボールネジのネジ軸におけるゴシックアーク溝の超仕上処理を実現できる砥石揺動装置および超仕上装置を提供することを目的とする。 However, the methods for superfinishing Gothic arc grooves in Patent Documents 1 and 2 mainly propose a suitable positional relationship between the rocking axis of the grindstone and the Gothic arc grooves. A device for realizing superfinishing of gothic arc grooves based on the determination of the position of is not specifically presented.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a grindstone oscillating device and a superfinishing device capable of superfinishing gothic arc grooves in the screw shaft of a ball screw.

本発明に係る砥石揺動装置は、砥石保持部、砥石押圧部および揺動モータを有する。砥石保持部は、超仕上に用いる砥石を収容するための貫通する砥石孔、および砥石が砥石孔から脱落するのを防止する砥石脱落防止装置を備える。砥石押圧部は、砥石孔に収容された砥石を砥石孔が貫通する方向の一方に向けて押圧するシリンダ装置を備え、揺動モータは、砥石孔が貫通する方向に直交する方向を揺動軸として砥石保持部および砥石押圧部を一体として揺動させるように構成される。 A grindstone rocking device according to the present invention has a grindstone holding portion, a grindstone pressing portion, and a rocking motor. The whetstone holding portion includes a whetstone hole extending therethrough for accommodating a whetstone used for superfinishing, and a whetstone drop prevention device for preventing the whetstone from dropping out of the whetstone hole. The whetstone pressing portion includes a cylinder device that presses the whetstone accommodated in the whetstone hole toward one of the penetrating directions of the whetstone hole. , the whetstone holding portion and the whetstone pressing portion are configured to swing integrally.

砥石孔は、貫通方向に直交する断面形状が揺動軸方向を長手方向とする矩形である。
砥石脱落防止装置は、砥石孔におけるその長手方向の一方の内面近くに挿入された板状の砥石押部、前記長手方向の一方の内面と砥石保持部における前記長手方向の一方側の端面とを貫通する雌ネジ、および雌ネジに螺合する雄ネジを有する。
砥石脱落防止装置は、雄ネジを雌ネジに進入させて砥石押部を砥石孔内の砥石に押圧することにより砥石の砥石孔からの脱落を防止するように形成されている。 The grindstone hole has a rectangular cross-sectional shape perpendicular to the penetrating direction, the longitudinal direction of which is the rocking axis direction.
The whetstone drop-off prevention device comprises a plate-like whetstone pressing portion inserted near one of the longitudinal inner surfaces of the whetstone hole, and the one longitudinal inner surface and one longitudinal end surface of the whetstone holding portion. It has female threads that pass through and male threads that screw into the female threads.
The whetstone dropout prevention device is formed to prevent the whetstone from falling out of the whetstone hole by inserting the male thread into the female thread and pressing the whetstone pressing portion against the whetstone in the whetstone hole.

シリンダ装置としてエアシリンダを用いるのが好ましい。
好ましくは、揺動モータのシャフトの軸心の延長が砥石の揺動軸に一致するように形成される。
本発明に係る超仕上装置は、前述した砥石揺動装置、ボールネジのネジ軸の両端を支持してネジ軸を回転させるネジ軸回転装置、およびネジ軸回転装置が支持するネジ軸の軸心
方向に砥石揺動装置を往復移動させる移動装置を有する。超仕上装置は、ネジ軸回転装置がネジ軸を１回転させる間に、移動装置が砥石揺動装置をネジ軸の１ピッチ分の距離移動させるように構成される。 An air cylinder is preferably used as the cylinder device.
Preferably, the extension of the axial center of the shaft of the swing motor is formed so as to coincide with the swing axis of the grindstone.
The superfinishing device according to the present invention includes the above-described grindstone oscillating device, the screw shaft rotating device that supports both ends of the screw shaft of the ball screw and rotates the screw shaft, and the axial direction of the screw shaft supported by the screw shaft rotating device. has a moving device for reciprocating the whetstone rocking device. The superfinishing device is configured such that while the screw shaft rotating device rotates the screw shaft once, the moving device moves the grindstone oscillating device by a distance corresponding to one pitch of the screw shaft.

本発明によると、ボールネジのネジ軸におけるゴシックアーク溝の超仕上処理を実際に行うことができる砥石揺動装置および超仕上装置を提供することができる。 According to the present invention, it is possible to provide a grindstone oscillating device and a superfinishing device that can actually perform superfinishing of gothic arc grooves in the screw shaft of a ball screw.

図１は超仕上装置の斜視図である。FIG. 1 is a perspective view of a superfinishing apparatus. 図２は超仕上装置の平面図である。FIG. 2 is a plan view of the superfinishing apparatus. 図３は超仕上装置の正面図である。FIG. 3 is a front view of the superfinishing device. 図４は超仕上装置の右側面図である。FIG. 4 is a right side view of the superfinishing device. 図５は砥石揺動装置の側面図である。FIG. 5 is a side view of the grindstone rocking device. 図６は砥石ヘッドの斜視図である。FIG. 6 is a perspective view of the grindstone head. 図７は砥石ヘッドの正面図である。FIG. 7 is a front view of the grindstone head. 図８は砥石ヘッドの平面図である。FIG. 8 is a plan view of the grindstone head. 図９は砥石ヘッドの左側面図である。FIG. 9 is a left side view of the grindstone head. 図１０は図７におけるＡ－Ａ矢視断面図である。10 is a cross-sectional view taken along the line AA in FIG. 7. FIG. 図１１は超仕上げ装置によりネジ軸のゴシックアーク溝の超仕上を行う様子を示す図である。FIG. 11 is a diagram showing how a gothic arc groove of a screw shaft is superfinished by a superfinishing device. 図１２は他の形態による砥石押圧部を示す図である。FIG. 12 is a diagram showing a whetstone pressing portion according to another embodiment.

図１は超仕上装置１の斜視図、図２は超仕上装置１の平面図、図３は超仕上装置１の正面図。図４は超仕上装置１の右側面図、図５は砥石揺動装置２の側面図、図６は砥石ヘッド３の斜視図、図７は砥石ヘッド３の正面図、図８は砥石ヘッド３の平面図、図９は砥石ヘッド３の左側面図、図１０は図７におけるＡ－Ａ矢視断面図である。
超仕上装置１は、ネジ軸回転装置４、砥石揺動装置２および砥石ヘッド移動装置５を有する。ネジ軸回転装置４および砥石ヘッド移動装置５は、基台６に支持される。基台６は、超仕上装置１の各構成要素を支持する基礎をなす部分である。 1 is a perspective view of the superfinishing device 1, FIG. 2 is a plan view of the superfinishing device 1, and FIG. 3 is a front view of the superfinishing device 1. FIG. 4 is a right side view of the superfinishing device 1, FIG. 5 is a side view of the grindstone rocking device 2, FIG. 6 is a perspective view of the grindstone head 3, FIG. 7 is a front view of the grindstone head 3, and FIG. 9 is a left side view of the grindstone head 3, and FIG. 10 is a sectional view taken along the line AA in FIG.
The superfinishing device 1 has a screw shaft rotating device 4 , a grindstone rocking device 2 and a grindstone head moving device 5 . The screw shaft rotating device 4 and the grindstone head moving device 5 are supported by the base 6 . The base 6 is a base portion that supports each component of the superfinishing apparatus 1 .

ネジ軸回転装置４は、主軸台１２および心押台１３からなる。
主軸台１２および心押台１３は、それぞれが超仕上対象のネジ軸Ｗの両端面を支えるためのセンタ１４，１５を有する。主軸台１２は主軸１６を備え、主軸１６はサーボモータ１７により正回転および逆回転する。サーボモータ１７は、図示しない制御装置によりその回転が制御される。 The screw shaft rotating device 4 consists of a headstock 12 and a tailstock 13 .
The headstock 12 and the tailstock 13 each have centers 14 and 15 for supporting both end faces of the screw shaft W to be superfinished. The headstock 12 has a spindle 16 , which is rotated forward and backward by a servomotor 17 . The rotation of the servomotor 17 is controlled by a control device (not shown).

主軸１６にはケレが固定されている。ケレは、センタ１４，１５が支える超仕上対象のネジ軸Ｗを主軸１６と一体に回転させる働きをする。
主軸台１２および心押台１３は、それぞれその下部に一体化されたアリガタがいずれも基台６に固定されたアリミゾ１８に嵌め入れられている。主軸台１２および心押台１３は、センタ１４，１５の並び方向（主軸１６の回転軸方向、アリミゾ１８が伸びた方向）に別個に移動可能である。主軸台１２および心押台１３は、超仕上対象のネジ軸Ｗの長さおよびその溝の位置に応じてそれぞれの位置が決定され、その並び方向への移動がそれぞれの固定装置１９ａ，１９ｂにより個別に制限される。 A burr is fixed to the main shaft 16 . The knurling functions to rotate the screw shaft W to be superfinished supported by the centers 14 and 15 integrally with the main shaft 16 .
The headstock 12 and the tailstock 13 are fitted with dovetail grooves 18 each having an integrated dovetail groove fixed to the base 6 . The headstock 12 and the tailstock 13 are independently movable in the alignment direction of the centers 14 and 15 (rotational axis direction of the main shaft 16, direction in which the dovetail groove 18 extends). The positions of the headstock 12 and the tailstock 13 are determined according to the length of the screw shaft W to be superfinished and the position of its groove. Individually restricted.

砥石揺動装置２は、砥石ヘッド３および揺動モータ２１を有する。
図６～図１０を参照して、砥石ヘッド３は、接続部２２、砥石保持部２３および砥石押圧部２４からなる。
接続部２２は、所謂フランジに類似する形態を有する円形の厚い板である。
砥石保持部２３は、支柱部２５および支持部２６を有する。支柱部２５は断面が略半円の柱状であり、断面半円の弦に相当する面を上に向け断面円弧の曲率中心を円形の接続部２２の中心に一致させて、接続部２２に一体化されている。支持部２６は、接続部２２から突出する支柱部２５の端部に一体化されて前記端部からさらに外方に突出する。支持部２６は、支柱部２５における半円断面の弦に直交する方向に貫通する砥石孔２７を有する
。砥石孔２７は貫通方向に直交する断面が矩形であり、その矩形断面の長手方向が支柱部２５における突出方向に一致する。 The grindstone rocking device 2 has a grindstone head 3 and a rocking motor 21 .
6 to 10, the grindstone head 3 comprises a connecting portion 22, a grindstone holding portion 23 and a grindstone pressing portion .
The connecting portion 22 is a circular thick plate having a shape similar to a so-called flange.
The whetstone holding portion 23 has a support portion 25 and a support portion 26 . The support section 25 has a columnar shape with a substantially semicircular cross section, and is integrated with the connecting section 22 so that the surface corresponding to the chord of the semicircular section faces upward and the center of curvature of the arc of the cross section coincides with the center of the circular connecting section 22 . has been made The support portion 26 is integrated with the end portion of the support portion 25 protruding from the connection portion 22 and further protrudes outward from the end portion. The support portion 26 has a grindstone hole 27 penetrating in a direction perpendicular to the chord of the semicircular cross section of the support portion 25 . The grindstone hole 27 has a rectangular cross section orthogonal to the penetrating direction, and the longitudinal direction of the rectangular cross section coincides with the projecting direction of the column portion 25 .

砥石保持部２３は、砥石孔２７からの砥石Ｓｔの脱落を防止するための砥石脱落防止装置２８を備える。
図１０を参照して、砥石脱落防止装置２８は、砥石押部２９、六角穴付全ネジ３０、緩み止めナット３１および支持部２６に設けられた雌ネジ３２からなる。
砥石押部２９は、砥石孔２７における矩形断面の幅方向を短辺とする矩形の板の長手方向の一方の端が直角に折れ曲がって僅かに突出した、「Ｌ」字状の形状を有する。 The whetstone holding portion 23 includes a whetstone drop prevention device 28 for preventing the whetstone St from dropping out of the whetstone hole 27 .
Referring to FIG. 10, the whetstone dropout prevention device 28 comprises a whetstone pressing portion 29, a hexagon socket screw 30, a locking nut 31, and a female screw 32 provided on the support portion 26. As shown in FIG.
The grindstone pressing portion 29 has an "L" shape in which one end in the longitudinal direction of a rectangular plate whose short sides are in the width direction of the rectangular cross section of the grindstone hole 27 is bent at right angles and protrudes slightly.

支持部２６の砥石孔２７に収容される砥石Ｓｔは、砥石孔２７の断面と略同じ矩形形状の断面を有するが、その長手方向寸法は砥石孔２７の長手方向寸法と比較して砥石押部２９の厚さ分より僅かに小さい。
雌ネジ３２は、支持部２６の突出する側の端面、つまり支柱部２５から離れた側の端面に開口し、この端面と砥石孔２７とを貫通する。 The whetstone St accommodated in the whetstone hole 27 of the support portion 26 has a rectangular cross section that is substantially the same as the cross section of the whetstone hole 27. 29 thickness.
The female screw 32 is opened in the end face of the supporting portion 26 on the protruding side, that is, in the end face on the side away from the support portion 25 , and passes through this end face and the grindstone hole 27 .

砥石保持部２３が砥石孔２７内に砥石Ｓｔを収容するとき、砥石押部２９は、直角に折れ曲がった端側を上に且つ端の直角に折れ曲がって突出する部分を外方に位置させて、砥石孔２７と砥石Ｓｔとにより生ずる隙間に嵌り込んでいる。
砥石脱落防止装置２８は、上記状態で、六角穴付全ネジ３０を螺合する雌ネジ３２に進入させ砥石押部２９を砥石Ｓｔの側面に押圧させることにより、砥石孔２７からの砥石Ｓｔの脱落を防止する。 When the whetstone holding portion 23 accommodates the whetstone St in the whetstone hole 27, the whetstone pressing portion 29 is positioned so that the right-angled bent end faces upward and the right-angled bent protruding portion of the end faces outward. It is fitted in a gap formed between the grindstone hole 27 and the grindstone St.
In the state described above, the whetstone dropout prevention device 28 inserts the hexagon socket head screw 30 into the female thread 32 to be screwed and presses the whetstone pushing portion 29 against the side surface of the whetstone St, thereby preventing the whetstone St from coming out of the whetstone hole 27. prevent it from falling off.

なお、六角穴付全ネジ３０は、砥石孔２７からの砥石Ｓｔの自然落下が防止でき且つ外力（例えば砥石押圧部２４による力）が加えられたときに砥石孔２７内を砥石Ｓｔが移動可能な程度の進入度合いで螺合される。
砥石押圧部２４は、アーム３５、エアシリンダ３６および押圧棒３７を有する。
アーム３５は、支柱部２５から離れた支柱部２５の上方において接続部２２から支柱部２５の突出方向と同方向に延び、延びた先でエアシリンダ３６（のシリンダ）を支持する。 The hexagon socket screw 30 can prevent the grindstone St from falling naturally from the grindstone hole 27, and allows the grindstone St to move within the grindstone hole 27 when an external force (for example, a force from the grindstone pressing portion 24) is applied. It is screwed with a degree of penetration.
The grindstone pressing portion 24 has an arm 35 , an air cylinder 36 and a pressing rod 37 .
The arm 35 extends in the same direction as the projecting direction of the column portion 25 from the connection portion 22 above the column portion 25 away from the column portion 25, and supports (the cylinder of) the air cylinder 36 at the extended end.

エアシリンダ３６は、そのロッド３８の先端部が支柱部２５側に位置するように、またそのロッド３８の軸心が断面半円の支柱部２５の軸心（断面半円の中心）に直交し且つ砥石孔２７の開口の略中央の上方となるようにして、アーム３５に一体化されている。
押圧棒３７は、短冊状の長い板であり、その長手方向をロッド３８の軸心方向に一致させてその長手方向の一方の端がエアシリンダ３６のロッド３８の先端部に（間接的に）連結されている。 The air cylinder 36 is arranged so that the tip of the rod 38 is positioned on the support 25 side, and the axis of the rod 38 is perpendicular to the axis of the support 25 (the center of the semicircle in cross section) of the semicircular cross section. Further, it is integrated with the arm 35 so as to be positioned substantially above the center of the opening of the grindstone hole 27 .
The pressing rod 37 is a long strip-shaped plate whose longitudinal direction is aligned with the axial direction of the rod 38 and whose one end in the longitudinal direction is (indirectly) attached to the tip of the rod 38 of the air cylinder 36 . Concatenated.

揺動モータ２１は、そのシャフトが砥石ヘッド３の接続部２２に連結されて特定の角度内で正転と逆転を繰り返すことにより、砥石ヘッド３を往復揺動させる。その揺動中心（揺動軸）は揺動モータ２１のシャフトの軸心の延長に一致し、図５、図７等において符合Ｃｓで示される。揺動モータ２１は、後述する砥石ヘッド移動装置５の移動体４１に固定され、移動体４１とともに移動する。揺動モータ２１にはサーボモータが使用される。 The swing motor 21 has its shaft connected to the connecting portion 22 of the grindstone head 3 and repeats forward and reverse rotation within a specific angle, thereby swinging the grindstone head 3 back and forth. The swing center (swing axis) coincides with the extension of the axial center of the shaft of the swing motor 21, and is indicated by Cs in FIGS. 5, 7, and the like. The swing motor 21 is fixed to a moving body 41 of the grindstone head moving device 5 to be described later, and moves together with the moving body 41 . A servomotor is used for the swing motor 21 .

砥石ヘッド移動装置５は、移動体４１、一対のリニアガイド４２，４２、ボールネジ４３およびサーボモータ４４を備える。一対のリニアガイ４２，４２は、そのレール４５，４５が互いに平行に且つ主軸台１２と心押台１３との並び方向に伸びて基台６に固定されている。ボールネジ４３は、そのネジ軸４６がレール４５，４５の中間にこれらと平行に配されている。ネジ軸４６の両端の軸受けは基台６に固定されている。 The grindstone head moving device 5 includes a moving body 41 , a pair of linear guides 42 , 42 , a ball screw 43 and a servomotor 44 . A pair of linear guides 42 , 42 are fixed to the base 6 with their rails 45 , 45 extending parallel to each other and in the direction in which the headstock 12 and the tailstock 13 are aligned. The ball screw 43 has its screw shaft 46 arranged between the rails 45, 45 in parallel thereto. Bearings at both ends of the screw shaft 46 are fixed to the base 6 .

移動体４１は、その上面に砥石揺動装置２（の揺動モータ２１）を非固定的に保持している。移動体４１は、その下方にリニアガイド４２，４２のブロックおよびボールネジ４３のボールナットが固定されている。
ネジ軸４６の一端には、サーボモータ４４が連結されている。サーボモータ４４は、基台６に固定されている。サーボモータ４４は、図示しない制御装置によりその回転が制御されて、移動体４１をリニアガイド４２，４２が伸びた方向に往復移動させる。 The moving body 41 holds (the rocking motor 21 of) the grindstone rocking device 2 in a non-fixed manner on its upper surface. Blocks of the linear guides 42 and 42 and a ball nut of the ball screw 43 are fixed to the lower part of the moving body 41 .
A servomotor 44 is connected to one end of the screw shaft 46 . A servo motor 44 is fixed to the base 6 . The rotation of the servomotor 44 is controlled by a control device (not shown) to reciprocate the moving body 41 in the direction in which the linear guides 42 , 42 extend.

砥石ヘッド移動装置５は、ネジ軸回転装置４の横（図２では上）に配される。
なお、砥石揺動装置２は、移動体４１に対して移動体４１の移動方向に直交する方向（図２の上下方向）に移動可能であり、且つこの直交する方向（図２の上下方向）に対して正逆のいずれにも傾斜可能である。さらに砥石揺動装置２は、砥石回転装置２からの超仕上後のネジ軸Ｗの取り出し、未加工のネジ軸Ｗの砥石揺動装置２への取り付けに砥石Ｓｔが干渉しないように、若干の上方への移動が可能である。 The grindstone head moving device 5 is arranged beside (above in FIG. 2) the screw shaft rotating device 4 .
The grindstone oscillating device 2 can move relative to the moving body 41 in a direction perpendicular to the moving direction of the moving body 41 (vertical direction in FIG. 2), and can move in this orthogonal direction (vertical direction in FIG. 2). can be tilted either forwards or backwards with respect to Further, the grindstone oscillating device 2 is slightly adjusted so that the grindstone St does not interfere with taking out the superfinished screw shaft W from the grindstone rotating device 2 and attaching the unprocessed screw shaft W to the grindstone oscillating device 2 . Upward movement is possible.

図１１は超仕上げ装置１によりネジ軸Ｗのゴシックアーク溝の超仕上を行う様子を示す図である。ここで（ａ）は超仕上時の斜視図、（ｂ）は超仕上時にネジ軸Ｗの軸心Ｃａおよび砥石Ｓｔの揺動軸Ｃｓのいずれにも直交する上方から砥石Ｓｔ等を見た図である。なおネジ軸Ｗのゴシックアーク溝（以下「溝」と略すことがある）の超仕上において、（ａ），（ｂ）のいずれも砥石Ｓｔが左から右に移動し、ネジ軸Ｗはその右端から見たときに時計回りに回転する。 11A and 11B are diagrams showing how the gothic arc groove of the screw shaft W is superfinished by the superfinishing apparatus 1. FIG. Here, (a) is a perspective view during superfinishing, and (b) is a view of the grindstone St and the like from above perpendicular to both the axis Ca of the screw shaft W and the swing axis Cs of the grindstone St during superfinishing. is. In the superfinishing of the gothic arc groove (hereinafter sometimes abbreviated as "groove") of the screw shaft W, in both cases (a) and (b), the grindstone St moves from left to right, and the screw shaft W moves to the right end. rotates clockwise when viewed from

砥石Ｓｔの研磨面（溝表面を研磨する面）の（断面）形状は、予めネジ軸Ｗの溝の（断面）形状に合わせて所定の形状に仕上げられている。
超仕上げ装置１によるネジ軸Ｗのゴシックアーク溝の超仕上は、砥石Ｓｔの揺動軸Ｃｓがネジ軸回転装置４に取り付けられたネジ軸Ｗの溝の延びる方向に一致するように、つまりネジ軸Ｗの軸心Ｃａおよび砥石Ｓｔの揺動軸Ｃｓのいずれにも直交する上方から見たとき（図１１（ｂ））ネジ軸Ｗの溝が延びる方向と砥石Ｓｔの揺動軸Ｃｓとが一致するように、移動体４１の移動方向に対する砥石揺動装置２の傾きが調整される。 The (cross-sectional) shape of the polishing surface (surface for polishing the groove surface) of the grindstone St is finished in a predetermined shape in accordance with the (cross-sectional) shape of the groove of the screw shaft W in advance.
The superfinishing of the gothic arc grooves of the screw shaft W by the superfinishing device 1 is performed so that the oscillating axis Cs of the grindstone St coincides with the direction in which the grooves of the screw shaft W attached to the screw shaft rotating device 4 extend. When viewed from above perpendicular to both the axis Ca of the shaft W and the oscillating axis Cs of the grindstone St (FIG. 11(b)), the direction in which the groove of the screw axis W extends and the oscillating axis Cs of the grindstone St are aligned. The inclination of the grindstone oscillating device 2 with respect to the movement direction of the moving body 41 is adjusted so as to match.

ネジ軸Ｗの溝の超仕上は、例えば図１１においては砥石揺動装置２（移動体４１、砥石ヘッド３）を左から右に移動させて行われる。ネジ軸Ｗの溝の超仕上における砥石揺動装置２のネジ軸Ｗ軸心方向への移動は、片道のみ、一往復または数往復のいずれかを選択可能である。
超仕上げ装置１は、ネジ軸回転装置４がネジ軸Ｗを（右端から見たとき時計回りに）１回転させる間に、砥石ヘッド移動装置５が砥石揺動装置２をネジ軸Ｗの１ピッチ分右に移動させる。そして、砥石揺動装置２は、ネジ軸Ｗが回転し砥石ヘッド３が左から右に移動する間、砥石Ｓｔを砥石揺動装置２が揺動軸Ｃｓ回りに高速で揺動させる。また、この間、砥石ヘッド３におけるエアシリンダ３６には加圧エアがそのシリンダ内に供給され、ロッド３８が伸張して押圧棒３７が砥石Ｓｔをネジ軸Ｗの溝に向けて押圧する。 Superfinishing of the groove of the screw shaft W is performed, for example, by moving the grindstone oscillating device 2 (moving body 41, grindstone head 3) from left to right in FIG. The movement of the grindstone oscillating device 2 in the axial direction of the screw shaft W in the superfinishing of the groove of the screw shaft W can be selected from one way, one reciprocation, or several reciprocations.
In the superfinishing device 1, while the screw shaft rotating device 4 rotates the screw shaft W once (clockwise when viewed from the right end), the grinding wheel head moving device 5 moves the grinding wheel swinging device 2 by one pitch of the screw shaft W. minutes to the right. The grindstone oscillating device 2 oscillates the grindstone St around the oscillating axis Cs at high speed while the screw shaft W rotates and the grindstone head 3 moves from left to right. During this time, pressurized air is supplied to the air cylinder 36 in the grindstone head 3, the rod 38 is extended, and the pressing rod 37 presses the grindstone St toward the groove of the screw shaft W. As shown in FIG.

超仕上げ装置１は、砥石Ｓｔを揺動させながらネジ軸Ｗの溝が設け設けられた部分を左端から右端まで移動させて溝の超仕上を行う。溝部分の右端に砥石Ｓｔが到達するとエアシリンダ３６への加圧エアの供給が停止され、超仕上げ装置１は次のネジ軸Ｗの超仕上に備える。砥石ヘッド３における砥石Ｓｔは、ネジ軸Ｗの溝による支えを失った後も、砥石脱落防止装置２８の砥石押部２９により適度な力で砥石孔２７の内面に押しつけられ、砥石孔２７からの下方への落下が防止される。 The superfinishing device 1 performs superfinishing of the groove by moving the grooved portion of the screw shaft W from the left end to the right end while rocking the grindstone St. When the grindstone St reaches the right end of the groove portion, the supply of pressurized air to the air cylinder 36 is stopped, and the superfinishing device 1 prepares for superfinishing of the next screw shaft W. FIG. Even after the grindstone St in the grindstone head 3 loses its support by the groove of the screw shaft W, the grindstone St is pressed against the inner surface of the grindstone hole 27 with an appropriate force by the grindstone pressing portion 29 of the grindstone dropout prevention device 28, and is removed from the grindstone hole 27. A downward fall is prevented.

図１２は他の形態による砥石押圧部２４Ｂを示す図である。
砥石押圧部２４Ｂは、アーム３５、エアシリンダ３６、押圧棒３７Ｂおよび付勢部材３９Ｂを有する。
砥石押圧部２４Ｂにおけるアーム３５およびエアシリンダ３６は、その形態および砥石ヘッド３における働き等が前述した砥石押圧部２４と同一であり、その説明を省略する。 FIG. 12 is a diagram showing a whetstone pressing portion 24B according to another embodiment.
The grindstone pressing portion 24B has an arm 35, an air cylinder 36, a pressing rod 37B and a biasing member 39B.
The arm 35 and the air cylinder 36 in the whetstone pressing portion 24B are the same as those of the whetstone pressing portion 24 described above in terms of the form and function of the whetstone head 3, and the description thereof will be omitted.

押圧棒３７Ｂは、短冊状のやや厚い板であり、その長手方向をロッド３８の軸心方向に一致させてその長手方向の一方の端がエアシリンダ３６のロッド３８の先端部に連結されている。押圧棒３７Ｂは、ロッド３８に連結された側とは反対側の端部に付勢部材３９Ｂを揺動可能に支持する。
付勢部材３９Ｂは、弾性部５１Ｂおよび連結部５２Ｂとからなる。弾性部５１Ｂは、砥石孔２７に嵌め入れられた砥石Ｓｔを上から見たときの矩形形状（上述した矩形断面と同意）と略同じ大きさの弾性を有する短冊状の薄板で形成されている。 The pressing rod 37B is a strip-shaped slightly thick plate, and its longitudinal direction is aligned with the axial direction of the rod 38, and one end in the longitudinal direction is connected to the tip of the rod 38 of the air cylinder 36. . The pressing rod 37B rockably supports the biasing member 39B at the end opposite to the side connected to the rod 38 .
The biasing member 39B is composed of an elastic portion 51B and a connecting portion 52B. The elastic portion 51B is formed of a strip-shaped thin plate having elasticity approximately the same as the rectangular shape (same as the rectangular cross section described above) when the grindstone St fitted in the grindstone hole 27 is viewed from above. .

弾性部５１Ｂは、その矩形形状における長手方向の両端から内方がいずれも平らな当接部５３Ｂ，５３Ｂとなっている。弾性部５１Ｂは、２つの当接部５３Ｂ，５３Ｂの間に、その厚さ方向の一方に凸状に湾曲または盛り上がる中間部５４Ｂを有する。
連結部５２Ｂは、中間部５４Ｂの凸状に突出する表面に一体化され、弾性部５１Ｂの幅
方向に間隔を有し向き合って外方に拡がった、一対の薄板である。 The elastic portion 51B has contact portions 53B, 53B that are both flat inward from both ends in the longitudinal direction of the rectangular shape. The elastic portion 51B has an intermediate portion 54B that is convexly curved or raised in one of its thickness directions between the two contact portions 53B, 53B.
The connecting portion 52B is a pair of thin plates that are integrated with the convexly protruding surface of the intermediate portion 54B and are spaced apart in the width direction of the elastic portion 51B and spread outward.

付勢部材３９Ｂは、連結部５２Ｂが揺動ピン５５Ｂにより押圧棒３７Ｂの端部に揺動可能に連結されている。付勢部材３９Ｂは、その矩形形状における幅方向に軸心が延びた揺動ピン５５Ｂを中心に揺動可能である。
砥石押圧部２４Ｂは、その付勢部材３９Ｂにおける当接部５３Ｂ，５３Ｂの砥石Ｓｔに対する押圧面積が砥石押圧部２４における押圧棒３７（の先端）の砥石Ｓｔに対する押圧面積に比べて大きく砥石Ｓｔへの押圧力が広い範囲に分散するので、砥石Ｓｔの局部的な破損の虞が減少する。 The connecting portion 52B of the biasing member 39B is swingably connected to the end of the pressing rod 37B by a swing pin 55B. The biasing member 39B can swing around a swing pin 55B whose axis extends in the width direction of the rectangular shape.
In the whetstone pressing portion 24B, the pressing area of the contact portions 53B, 53B of the urging member 39B against the whetstone St is larger than the pressing area of (the tip of) the pressing rod 37 of the whetstone pressing portion 24 with respect to the whetstone St. Since the pressing force of is dispersed over a wide range, the risk of local damage to the grindstone St is reduced.

また、付勢部材３９Ｂはその当接部５３Ｂ，５３Ｂが砥石Ｓｔの長手方向端近傍を押圧する。ところで、砥石Ｓｔのネジ軸Ｗの溝の円形断面における法線方向についての押圧力は砥石Ｓｔの長手方向の端ほど小さくなる。付勢部材３９Ｂは、当接部５３Ｂ，５３Ｂが砥石Ｓｔの長手方向端近傍を押圧することによって、砥石Ｓｔの長手方向の端近傍におけるネジ軸Ｗの溝表面に対する押圧力の低下を減少させる効果が期待できる。 Further, the contact portions 53B, 53B of the biasing member 39B press the vicinity of the longitudinal end of the grindstone St. By the way, the pressing force in the direction normal to the circular cross-section of the groove of the threaded shaft W of the grindstone St becomes smaller toward the end in the longitudinal direction of the grindstone St. The biasing member 39B has the effect of reducing the decrease in the pressing force of the threaded shaft W against the groove surface in the vicinity of the longitudinal end of the grindstone St by the contact portions 53B, 53B pressing the vicinity of the longitudinal end of the grindstone St. can be expected.

上述の実施形態において、砥石押圧部２４，２４Ｂにおけるエアシリンダ３６に代えて油圧シリンダを用いることができる。
その他、超仕上げ装置１、および超仕上げ装置１の各構成または全体の構造、形状、寸法、個数、材質などは、本発明の趣旨に沿って適宜変更することができる。 In the above-described embodiments, hydraulic cylinders can be used in place of the air cylinders 36 in the grindstone pressing portions 24, 24B.
In addition, the superfinishing device 1 and each component or the overall structure, shape, size, number, material, etc. of the superfinishing device 1 can be appropriately changed in line with the gist of the present invention.

本発明は、ボールネジのネジ軸の溝を超仕上する装置に利用することができる。 INDUSTRIAL APPLICABILITY The present invention can be used in a device for superfinishing the groove of the screw shaft of a ball screw.

１ 超仕上げ装置
２ 砥石揺動装置
４ ネジ軸回転装置
５ 砥石ヘッド移動装置（移動装置）
２１ 揺動モータ
２３ 砥石保持部
２４，２４Ｂ 砥石押圧部
２７ 砥石孔
２８ 砥石脱落防止装置
２９ 砥石押部
３０ 六角穴付全ネジ（雄ネジ）
３２ （支柱部２５に設けられた）雌ネジ
３６ エアシリンダ（シリンダ装置）
Ｃｓ 揺動軸
Ｓｔ 砥石
Ｗ ボールネジのネジ軸 1 Superfinishing device 2 Grindstone rocking device 4 Screw shaft rotating device 5 Grinding head moving device (moving device)
21 Rocking motor 23 Grindstone holders 24, 24B Grindstone pressing part 27 Grindstone hole 28 Grindstone fall prevention device 29 Grindstone push part 30 Full screw with hexagon socket (male screw)
32 female thread 36 (provided in the strut portion 25) air cylinder (cylinder device)
Cs Oscillation axis St Grindstone W Screw axis of ball screw

Claims (5)

砥石保持部と、
砥石押圧部と、
揺動モータと、を有し、
前記砥石保持部は、超仕上に用いる砥石を収容するための貫通する砥石孔、および前記砥石が前記砥石孔から脱落するのを防止する砥石脱落防止装置を備え、
前記砥石押圧部は、前記砥石孔に収容された前記砥石を前記砥石孔が貫通する方向の一方に向けて押圧するシリンダ装置を備え、
前記揺動モータは、前記砥石孔が貫通する方向に直交する方向を揺動軸として前記砥石保持部および前記砥石押圧部を一体として揺動させる
ことを特徴とする砥石揺動装置。 a grindstone holding portion;
a grindstone pressing portion;
an oscillating motor;
The whetstone holding portion includes a whetstone hole extending therethrough for accommodating a whetstone used for superfinishing, and a whetstone drop prevention device for preventing the whetstone from falling out of the whetstone hole,
The whetstone pressing portion includes a cylinder device that presses the whetstone accommodated in the whetstone hole toward one of the directions in which the whetstone hole penetrates,
The whetstone swinging device, wherein the whetstone swing motor swings the whetstone holding portion and the whetstone pressing portion integrally with a swing axis extending in a direction orthogonal to a direction in which the whetstone hole penetrates. 前記砥石孔は、貫通方向に直交する断面形状が前記揺動軸方向を長手方向とする矩形であり、
前記砥石脱落防止装置は、
前記砥石孔におけるその長手方向の一方の内面近くに挿入された板状の砥石押部と、
前記長手方向の一方の内面と前記砥石保持部における前記長手方向の一方側の端面とを貫通する雌ネジと、
前記雌ネジに螺合する雄ネジと、を有し、
前記雄ネジを前記雌ネジに進入させて前記砥石押部を前記砥石孔内の前記砥石に押圧することにより前記砥石の前記砥石孔からの脱落を防止するように形成された
請求項１に記載の砥石揺動装置。 The grindstone hole has a rectangular cross-sectional shape perpendicular to the through-hole direction with the swing axis direction as the longitudinal direction,
The whetstone dropout prevention device is
a plate-shaped grindstone pressing portion inserted near one inner surface of the grindstone hole in the longitudinal direction thereof;
a female thread penetrating through one longitudinal inner surface and one longitudinal end surface of the grindstone holding portion;
a male screw that is screwed into the female screw,
2. The grindstone is formed so as to prevent the grindstone from falling out of the grindstone hole by inserting the male thread into the female thread and pressing the grindstone pressing portion against the grindstone in the grindstone hole. grinding wheel rocking device. 前記シリンダ装置がエアシリンダである
請求項１または請求項２に記載の砥石揺動装置。 The grindstone oscillating device according to claim 1 or 2, wherein the cylinder device is an air cylinder. 前記揺動モータのシャフトの軸心の延長が前記揺動軸に一致する
請求項１ないし請求項３のいずれか１項に記載の砥石揺動装置。 The grindstone oscillating device according to any one of claims 1 to 3, wherein an extension of the axial center of the shaft of the oscillating motor coincides with the oscillating axis. 請求項１ないし請求項４のいずれか１項に記載の砥石揺動装置と、
ボールネジのネジ軸の両端を支持して前記ネジ軸を回転させるネジ軸回転装置と、
前記ネジ軸回転装置が支持する前記ネジ軸の軸心方向に前記砥石揺動装置を往復移動させる移動装置と、を有し、
前記ネジ軸回転装置が前記ネジ軸を１回転させる間に、前記移動装置が前記砥石揺動装置を前記ネジ軸の１ピッチ分の距離移動させるように構成された
ことを特徴とするネジ軸の超仕上装置。 a grindstone oscillating device according to any one of claims 1 to 4;
a screw shaft rotating device that supports both ends of a screw shaft of a ball screw and rotates the screw shaft;
a moving device for reciprocating the grinding wheel oscillating device in the axial direction of the screw shaft supported by the screw shaft rotating device;
wherein the moving device is configured to move the grindstone swinging device by a distance of one pitch of the screw shaft while the screw shaft rotating device rotates the screw shaft once. Superfinishing equipment.
JP2021094396A 2021-06-04 2021-06-04 Grindstone oscillating device and screw shaft superfinishing device Active JP7518538B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5570956U (en) * 1978-11-02 1980-05-16
JPS58109266A (en) * 1981-12-23 1983-06-29 Osaka Seiki Kk Super finishing for ring-shaped work
JP2004001199A (en) * 2002-04-10 2004-01-08 Nsk Ltd Method for super-finishing of gothic arc slot
JP2004050391A (en) * 2002-07-24 2004-02-19 Koyo Seiko Co Ltd Super-finishing device
JP2008087090A (en) * 2006-09-29 2008-04-17 Jtekt Corp Screw groove cutting method and device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003200341A (en) 2001-12-28 2003-07-15 Daisei Co Ltd Superfinishing machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5570956U (en) * 1978-11-02 1980-05-16
JPS58109266A (en) * 1981-12-23 1983-06-29 Osaka Seiki Kk Super finishing for ring-shaped work
JP2004001199A (en) * 2002-04-10 2004-01-08 Nsk Ltd Method for super-finishing of gothic arc slot
JP2004050391A (en) * 2002-07-24 2004-02-19 Koyo Seiko Co Ltd Super-finishing device
JP2008087090A (en) * 2006-09-29 2008-04-17 Jtekt Corp Screw groove cutting method and device

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