JP5865295B2 - Work pressing tool used in machine tools - Google Patents
Work pressing tool used in machine tools Download PDFInfo
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- JP5865295B2 JP5865295B2 JP2013101121A JP2013101121A JP5865295B2 JP 5865295 B2 JP5865295 B2 JP 5865295B2 JP 2013101121 A JP2013101121 A JP 2013101121A JP 2013101121 A JP2013101121 A JP 2013101121A JP 5865295 B2 JP5865295 B2 JP 5865295B2
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Description
本発明は、工作機械のワーク保持に使用されるワーク押圧具に関する。 The present invention relates to a workpiece pressing tool used for holding a workpiece of a machine tool.
研削箇所の背面からワークを支えるワーク押圧具として、特許文献１に示されるワーク押圧具が知られている。
ワーク押圧具は、ワークの周縁部に押圧力を付与する複数の押圧部が設けられている。ワークは、背面が複雑な形状をしており、ワーク押圧具はこれに倣った位置でロックされ、ワークをバックアップする。研削中、砥石は被加工面部分を押圧し撓み変形させようとするが、押圧部がこの撓み変形を阻止する。
As a workpiece pressing tool that supports a workpiece from the back of a grinding location, a workpiece pressing tool disclosed in Patent Document 1 is known.
The workpiece pressing tool is provided with a plurality of pressing portions that apply a pressing force to the peripheral portion of the workpiece. The work has a complicated shape on the back surface, and the work pressing tool is locked at a position following the work to back up the work. During grinding, the grindstone tends to press and deform the surface of the workpiece, but the pressing portion prevents this deformation.
上記した既存のワーク押圧具においては、押圧部の摩耗が進行するに伴って、ワーク保持装置の構成部品の相互間の隙間や遊動量が漸次に増大する。このため、ワークの保持力を低下させないための工夫が必要である。保持力が低下したままだと、研削精度に影響がでるからである。
また、特許文献１においては、ワークを支える駆動系統とは別に、押圧部を固定するために駆動系統を有しており、装置が複雑化するものとなっている。
本発明は、ワーク押圧具を構成する部品の摩耗が進行しても、押圧部の保持力が低下しない工作機械に使用されるワーク押圧具を提供することを目的とする。また、ワーク押圧具のコンパクト化を図ることも合わせて提案する。
In the above existing workpiece pressing tool, as wear of the pressing portion progresses, the gaps and the amount of play between the component parts of the workpiece holding device gradually increase. For this reason, the device for not reducing the holding | maintenance force of a workpiece | work is required. This is because the grinding accuracy is affected if the holding force remains low.
Moreover, in patent document 1, it has a drive system in order to fix a press part separately from the drive system which supports a workpiece | work, and an apparatus becomes complicated.
An object of the present invention is to provide a work pressing tool used in a machine tool in which the holding force of a pressing portion does not decrease even when wear of parts constituting the work pressing tool progresses. It is also proposed to make the work pressing tool compact.
上記課題を解決するため、本発明に係る工作機械に使用されるワーク押圧具は、研削すべきワークを反対側中央において基準線方向に押圧するプッシャーと、前記基準線の周りに周壁で取り囲み、前記周壁には基準線方向に開口した案内孔が複数設けられた押圧本体部と、前記周壁で取り囲まれた空間内に、前記基準線方向に相対移動可能に配置されたトグル受体と、前記基準線方向に相対移動可能に配置されたトグル受体と、前記基準線方向の複数孔に夫々が配置され、前記開口を介して前記基準線方向に突出してワークに対して進退可能な複数の押圧部材と、一端が前記トグル受体に当接し、前記周壁に設けられた前記案内孔に貫通する孔を介して他端が前記押圧部材に当接した棒状のトグル駒とを有し、前記トグル受体が前記押圧本体部に対して相対移動したときに、前記基準線に対して当初斜めであった複数のトグル駒の姿勢が、前記基準線に対して垂直に近づくことにより、前記トグル駒を前記押圧部材に押し付けて固定することを特徴とする。 In order to solve the above problems, a workpiece pressing tool used in a machine tool according to the present invention is surrounded by a pusher that presses a workpiece to be ground in the direction of the reference line at the opposite center, and a peripheral wall around the reference line, A pressing main body portion provided with a plurality of guide holes opened in a reference line direction in the peripheral wall; a toggle receiver disposed in a space surrounded by the peripheral wall so as to be relatively movable in the reference line direction; A toggle receiver disposed so as to be relatively movable in the reference line direction, and a plurality of holes arranged in the plurality of holes in the reference line direction, and projecting in the reference line direction through the openings and capable of moving forward and backward with respect to the workpiece. A pressing member, and a rod-shaped toggle piece whose one end is in contact with the toggle receiver and whose other end is in contact with the pressing member through a hole penetrating the guide hole provided in the peripheral wall, Toggle receiver is the pressing body When the relative movement is made, the postures of the plurality of toggle pieces that are initially oblique with respect to the reference line approach the perpendicular to the reference line, thereby pressing the toggle piece against the pressing member and fixing it. It is characterized by doing.
本発明によれば、撓み易いワークであってもこれをバックアップし、位置保持させることができ、ワークの他方主面を高精度且つ高能率に工作することが可能となる。
また、構成部品の摩耗が進行すると、基準線に直交した平面に対するトグル駒の長手方向の傾斜角が漸次にゼロに近づくため、押圧部材の固定が緩むどころか、反対により強固になるという効果がある。
また、1つの実施態様によれば、トグル受体にプッシャーが形成され、プッシャーを前記基準線方向に周壁で取り囲まれた空間内から脱する方向に圧縮スプリングの弾力で付勢される構成が採用される。プッシャーがワークに押し付けられることにより、トグル受体が移動して押圧部材がトグル駒により固定されるのである。このように、ワークに押し付けられたプッシャーに連動してトグル受体を移動させることにより、ワークを押圧する駆動系統が押圧部材を固定するための駆動系統を兼用することができ、簡単化・コンパクト化することができる。
According to the present invention, even a work that is easily bent can be backed up and held in position, and the other main surface of the work can be machined with high accuracy and high efficiency.
Further, as the wear of the component progresses, the inclination angle of the toggle piece in the longitudinal direction with respect to the plane orthogonal to the reference line gradually approaches zero, so that there is an effect that the fixing of the pressing member becomes stronger rather than loosened.
Further, according to one embodiment, a configuration is adopted in which a pusher is formed in the toggle receiver, and the pusher is urged by the elasticity of the compression spring in a direction away from the space surrounded by the peripheral wall in the reference line direction. Is done. When the pusher is pressed against the work, the toggle receiver moves and the pressing member is fixed by the toggle piece. In this way, by moving the toggle receiver in conjunction with the pusher pressed against the work, the drive system that presses the work can also be used as the drive system for fixing the pressing member. Can be
以下、図面を参照して、実施例について説明する。
図１において、研削盤１００は、基台１の上面に砥石装置２００及びワーク保持装置３００を装設された研削盤である。
砥石装置２００は基台１の上面に起立状に固定された第１コラム２、及び、この第１コラム２の前面に上下動可能に設けられた砥石ユニット３を備えている。砥石ユニット３は図示しないモータで回転される縦回転軸３ａを具備し、この縦回転軸３ａの下端に研削用の砥石３ｂが固定されている。この研削用砥石３ｂは上面ａ１をワークｗの研削予定箇所に当接される。
Hereinafter, embodiments will be described with reference to the drawings.
In FIG. 1, a grinding machine 100 is a grinding machine in which a grindstone device 200 and a work holding device 300 are installed on the upper surface of a base 1.
The grindstone device 200 includes a first column 2 fixed upright on the upper surface of the base 1, and a grindstone unit 3 provided on the front surface of the first column 2 so as to be movable up and down. The grindstone unit 3 includes a vertical rotation shaft 3a that is rotated by a motor (not shown), and a grinding wheel 3b for grinding is fixed to the lower end of the vertical rotation shaft 3a. The grinding wheel 3b is brought into contact with the planned grinding portion of the workpiece w on the upper surface a1.
ワーク保持装置３００は基台１の上面に第１コラム２と並んで起立状に固定された第２コラム４と、この第２コラム４に設けられた心押台５と、この心押台５に支持されたワーク押圧具４００と、ワーク押圧具４００の真下箇所である基台１の上面箇所に設けられた主軸台６からなっている。 The work holding device 300 includes a second column 4 which is fixed upright on the upper surface of the base 1 along with the first column 2, a tailstock 5 provided on the second column 4, and the tailstock 5 The workpiece pressing tool 400 supported by the workpiece pressing tool 400 and the headstock 6 provided at the upper surface portion of the base 1 which is a position immediately below the workpiece pressing tool 400.
図２において、心押台５は、流体圧により又はネジ軸の回転により上下駆動力を発生する駆動部５ａ１の作動により上下方向へ移動する支持本体部５ａと、支持本体部５ａに組み込まれたホルダ５ｂと、ホルダ５ｂの下端部に同心状に固定されたローリングセンタ５ｃとを備えている。ローリングセンタ５ｃはホルダ５ｂに嵌合状に固定されるシャンクｂ１を具備したセンタ基部５ｃ１及び、このセンタ基部５ｃ１の中心線（基準線ｃ１）回りの回転自在に組み込まれたセンタ回転部５ｃ２を備えている。 In FIG. 2, the tailstock 5 is incorporated in the support main body 5a, which is moved in the vertical direction by the operation of the drive unit 5a1 that generates vertical drive force by fluid pressure or by rotation of the screw shaft. A holder 5b and a rolling center 5c fixed concentrically to the lower end of the holder 5b are provided. The rolling center 5c includes a center base portion 5c1 having a shank b1 fixed to the holder 5b in a fitting manner, and a center rotating portion 5c2 that is rotatably incorporated around a center line (reference line c1) of the center base portion 5c1. ing.
ワーク押圧具４００は、押圧本体部７と、押圧本体部７内を案内され上下へ移動可能なトグル受体８とを備えている。押圧本体部７は図３に示すように下部に円形突部９ａを有する円板体からなるローリングセンタ受け９と、内孔の上端縁を円形突部９ａに外嵌され内孔の下端縁に小径内周面部１０ａを形成され、基準線ｃ１の周りを取り囲んだ周壁の肉厚箇所に複数（図示例では６つ）の基準線ｃ１向きの案内孔１０ｂを基準線ｃ１回りの等角配置に形成された筒状体１０とを備え、これらローリングセンタ受け９及び筒状体１０とを図示しない複数の縦向きボルトで一体状に結合した構成とされている。筒状体１０は内部の中空で、トグル受体８の上下移動を案内する。 The work pressing tool 400 includes a pressing main body portion 7 and a toggle receiver 8 that is guided in the pressing main body portion 7 and is movable up and down. As shown in FIG. 3, the pressing main body 7 has a rolling center receiver 9 made of a disc body having a circular protrusion 9a at the lower portion thereof, and an upper end edge of the inner hole is externally fitted to the circular protrusion 9a and is attached to a lower edge of the inner hole. A plurality of (six in the illustrated example) guide holes 10b facing the reference line c1 are formed in an equiangular arrangement around the reference line c1 in the thick portion of the peripheral wall formed with the small-diameter inner peripheral surface portion 10a and surrounding the reference line c1. The formed cylindrical body 10 is provided, and the rolling center receiver 9 and the cylindrical body 10 are integrally coupled with a plurality of vertical bolts (not shown). The cylindrical body 10 is hollow inside and guides the vertical movement of the toggle receiver 8.
ローリングセンタ受け９は中央に縦向きの中心孔９ｂを形成され、この中心孔９ｂにローリングセンタ５ｃのセンタ回転部５ｃ２の下部を嵌挿され、横向きネジ部材１１を介しセンタ回転部５ｃ２に同心状且つ一体状に結合されている。 The rolling center receiver 9 is formed with a longitudinal center hole 9b in the center, and a lower portion of the center rotating portion 5c2 of the rolling center 5c is fitted into the center hole 9b, and is concentric with the center rotating portion 5c2 via a laterally facing screw member 11. And they are joined together.
図６はトグル受体８を示す斜視図である。トグル受体８は筒状体１０の内孔に案内され上下方向へ変位される第１外周面部８ａ、筒状体１０の小径内周面部１０ａに案内される第２外周面部８ｂ、上面の中心部に形成された円形凹み８ｃ、及び、下面の中心部に形成された円形凸部のプッシャー８ｄを具備している。プッシャー８ｄの下面は、ワーク押圧具４００が降下したとき、図３中の基準位置ｃ２に位置されたワークｗの上面をなす一方主面ｗ１の中央部に当接する。 FIG. 6 is a perspective view showing the toggle receiver 8. The toggle receiver 8 is guided by the inner hole of the cylindrical body 10 and displaced in the vertical direction, the first outer peripheral surface part 8a, the second outer peripheral surface part 8b guided by the small-diameter inner peripheral surface part 10a, and the center of the upper surface. A circular dent 8c formed in the central portion and a circular convex pusher 8d formed in the central portion of the lower surface. When the work pressing tool 400 is lowered, the lower surface of the pusher 8d comes into contact with the central portion of one main surface w1 that forms the upper surface of the work w located at the reference position c2 in FIG.
トグル受体８の上部で基準線ｃ１回りの周方向上には複数（図示例では６つ）のガイド溝ｄ１が筒状体１０の基準線ｃ１向きの案内孔１０ｂに正対するように基準線ｃ１回りの等角配置に形成されている。各ガイド溝ｄ１は底面イ、周方向で対向した一対の第１縦壁面ロ及びハ、この一対の縦壁面ロ及びハの基準線ｃ１側を結合した図４中に示す上方視円弧状の第２縦壁面ニとで囲まれ、上面側や、上部の半径方向外側は開放されている。 A plurality of (six in the illustrated example) guide grooves d1 in the circumferential direction around the reference line c1 at the upper part of the toggle receiver 8 are arranged in such a way as to face the guide holes 10b facing the reference line c1 of the cylindrical body 10. It is formed in an equiangular arrangement around c1. Each guide groove d1 has a bottom arc, a pair of first vertical wall surfaces B and C opposed to each other in the circumferential direction, and a pair of vertical wall surfaces B and C that are arcuately viewed from above as shown in FIG. Surrounded by two vertical wall surfaces, the upper surface side and the upper radial direction outside are open.
図３〜図５において、トグル受体８とローリングセンタ受け９との間には複数（図示例では３つ）の縦向き案内ピン１２が基準線ｃ１回りの等角配置に位置され、一方の端部をトグル受体８の孔８ｅに摺動可能に挿入され、他方の端部をローリングセンタ受け９の孔９ｃに摺動自在に挿入されている。これら案内ピン１２は、トグル受体８とローリングセンタ受け９の上下方向の相対変位は許容するが基準線ｃ１回りの相対回転は規制するように作用する。
筒状体１０の案内孔１０ｂにはピン状の押圧部材１３が摺動自在に挿設され、筒状体１０の壁面に螺着されたボルト１４と、押圧部材１３に形成された溝１３ａとの係合により下方への抜け出しを規制されている。
3 to 5, a plurality of (three in the illustrated example) vertical guide pins 12 are positioned in an equiangular arrangement around the reference line c1 between the toggle receiver 8 and the rolling center receiver 9. One end is slidably inserted into the hole 8 e of the toggle receiver 8, and the other end is slidably inserted into the hole 9 c of the rolling center receiver 9. These guide pins 12 act so as to allow relative displacement in the vertical direction of the toggle receiver 8 and the rolling center receiver 9 but restrict relative rotation around the reference line c1.
A pin-shaped pressing member 13 is slidably inserted in the guide hole 10 b of the cylindrical body 10, a bolt 14 screwed to the wall surface of the cylindrical body 10, a groove 13 a formed in the pressing member 13, and Is prevented from coming out downward.
そして、案内孔１０ｂ内の押圧部材１３の上側領域には押圧部材１３を下方へ付勢するための圧縮スプリング１５が挿設されている。各押圧部材１３の下面はワーク押圧具４００が基準位置ｃ２のワークｗに向かって移動する過程で、ワークｗの周縁部の高さに応じて圧接される。
筒状体１０の高さ中央寄り箇所であって各案内孔１０ｂのガイド溝ｄ１側の周壁部にはその対応するガイド溝ｄ１に正対する円形状の孔ｅ１が形成されている。この孔ｅ１は案内孔１０ｂに貫通しており、その大きさは孔ｅ１に一端部を配置されるトグル駒１６の大きさに対応して決定される。図示例では筒状体１０の各案内孔１０ｂの外側となる周壁部で孔ｅ１と正対する箇所にも雌ネジ付の円形孔ｅ２が形成されている。この円形孔ｅ２は先の孔ｅ１の加工を容易化させると共にトグル駒１６を筒状体１０及びトグル受体８の内方に組み付ける処理を容易化させる上で寄与する。
A compression spring 15 for urging the pressing member 13 downward is inserted in an upper region of the pressing member 13 in the guide hole 10b. The lower surface of each pressing member 13 is pressed in accordance with the height of the peripheral edge of the workpiece w in the process in which the workpiece pressing tool 400 moves toward the workpiece w at the reference position c2.
A circular hole e1 facing the corresponding guide groove d1 is formed in the peripheral wall portion on the guide groove d1 side of each guide hole 10b near the center of the height of the cylindrical body 10. The hole e1 passes through the guide hole 10b, and the size thereof is determined according to the size of the toggle piece 16 having one end disposed in the hole e1. In the illustrated example, a circular hole e2 with a female screw is also formed at a location facing the hole e1 in the peripheral wall portion that is the outside of each guide hole 10b of the cylindrical body 10. This circular hole e2 contributes to facilitating the processing of the previous hole e1 and facilitating the process of assembling the toggle piece 16 inside the cylindrical body 10 and the toggle receiver 8.
１つのガイド溝ｄ１及びその対応する孔ｅ１の存在した箇所からなるガイド溝ｄ１のそれぞれには１つのトグル駒１６がトグル受体８の周方向の遊動を制限された状態でトグル受体８の半径面に沿った姿勢変更可能に配置されている。このトグル駒１６は２つの球体１６ａ、１６ｂとこれら球体１６ａ、１６ｂの間に配置される筒状棒部材１６ｃとからなった棒状の部材である。これら球体１６ａ、１６ｂ、筒状棒部材１６ｃは一体状に固着させてもよいし、それぞれを単独体として相互の摺接変位を許容する連接状態としてもよい。トグル駒１６は、加工の容易性から３つの部材１６ａ、１６ｂ、１６ｃから形成されている。このトグル駒１６を筒状体１０及びトグル受体８の内方に位置させるには、押圧部材１３を筒状体に組み付ける前に孔ｅ１及び円形孔ｅ２を通じて、トグル駒１６をその対応するガイド溝ｄ１内に挿入する。円形孔ｅ２には最終的にプラグ１７が螺着される。押圧部材１３は外周面の一部を切除されて平面箇所を形成されており、トグル駒１６の球体１６ａはこの平面箇所に当接される。なおトグル駒１６は上記したものに代えて、図９に示すように、単一の中実状棒部材の両端を部分球面に形成したとしても差し支えない。 In each of the guide grooves d1 including the one guide groove d1 and the corresponding hole e1, there is one toggle piece 16 in a state where the circumferential movement of the toggle receiver 8 is restricted. It is arranged so that its posture can be changed along the radial plane. The toggle piece 16 is a rod-shaped member composed of two spheres 16a and 16b and a cylindrical rod member 16c disposed between the spheres 16a and 16b. The spherical bodies 16a and 16b and the cylindrical bar member 16c may be fixed integrally, or may be connected to each other so as to allow mutual sliding displacement. The toggle piece 16 is formed of three members 16a, 16b, and 16c for ease of processing. In order to position the toggle piece 16 inside the cylindrical body 10 and the toggle receiver 8, the toggle piece 16 is guided through the hole e1 and the circular hole e2 before the pressing member 13 is assembled to the cylindrical body. Insert into the groove d1. The plug 17 is finally screwed into the circular hole e2. A part of the outer peripheral surface of the pressing member 13 is cut away to form a flat portion, and the spherical body 16a of the toggle piece 16 is brought into contact with the flat portion. The toggle piece 16 may be formed as a partial spherical surface at both ends of a single solid bar member as shown in FIG. 9 instead of the above-described one.
トグル受体８の各ガイド溝ｄ１の下側の肉部には位置調整ネジ１８が螺着されている。各位置調整ネジ１８は上端でガイド溝ｄ１内のトグル駒１６の球体１６ｂを支持することができ、下端にロックナットが螺着されてその弛緩を阻止し得るようになっている。この位置調整ネジ１８の回し操作による上下位置変更により、トグル受体８の押圧本体部７に対する上下方向位置とトグル駒１６の水平面に対する傾斜角θ１との関係を変化させることができる。このように装着された位置調整ネジ１８は研削盤１００によるワークｗの加工過程での調整操作を可能とする。 A position adjusting screw 18 is screwed to the lower meat portion of each guide groove d1 of the toggle receiver 8. Each position adjusting screw 18 can support the sphere 16b of the toggle piece 16 in the guide groove d1 at the upper end, and a lock nut can be screwed to the lower end to prevent the loosening. By changing the vertical position by rotating the position adjusting screw 18, the relationship between the vertical position of the toggle receiver 8 with respect to the pressing main body portion 7 and the inclination angle θ <b> 1 of the toggle piece 16 with respect to the horizontal plane can be changed. The position adjusting screw 18 mounted in this way enables an adjusting operation in the process of processing the workpiece w by the grinding machine 100.
トグル受体８の凹み孔８ｃ（図６）の底面上には円環状のバネ受け１９を挿入する。このバネ受け１９は外周縁が各空所ｄ０の第２縦面壁ニよりもトグル受体８半径方向外側に張り出した状態とされる。これによりトグル駒１６の基準線ｃ１側の球体１６ｂの許容範囲を超える上方変位が規制される。そして、凹み孔８ｃ内のバネ受け１９とローリングセンタ受け９の中心孔９ｂ内のバネ座箇所との間に圧縮スプリング２０を挿設し、トグル受体８が弾力で常に筒状体１０は内部の中空から脱する方向へ付勢された状態とする。 An annular spring receiver 19 is inserted on the bottom surface of the recessed hole 8 c (FIG. 6) of the toggle receiver 8. The spring receiver 19 is in a state in which the outer peripheral edge protrudes outward in the radial direction of the toggle receiver 8 from the second vertical wall d of each space d0. Thereby, the upward displacement exceeding the allowable range of the sphere 16b on the reference line c1 side of the toggle piece 16 is restricted. Then, a compression spring 20 is inserted between the spring receiver 19 in the recess hole 8c and the spring seat portion in the center hole 9b of the rolling center receiver 9, so that the toggle receiver 8 is elastic and the tubular body 10 is always inside. It is set as the state biased in the direction which removes from the hollow.
図１において、主軸台６は、基台１の上面に固定された箱形支持フレーム６ａ及び、これの内方に設けられたモータ２１を備えている。このモータ２１で駆動される縦向きのワーク支持軸２２が箱形支持フレーム６ａに図示しない軸受を介して回転自在に支持され上端部を上面中央部から上方へ突出されている。ワーク支持軸２２は回転中心を、トグル受体８の中心線と合致した基準線ｃ１に合致され上端部に環状水平面からなるワーク支持用の基準座ｆ１を形成され、この基準座ｆ１よりも上側に基準線ｃ１を中心とした細径部２２ａを形成されている。この細径部２２ａにはワークｗの雌スプライン部ｇ１に嵌合される雄スプライン部ｇ２が形成される。 In FIG. 1, the headstock 6 includes a box-shaped support frame 6 a fixed to the upper surface of the base 1, and a motor 21 provided inside the box-type support frame 6 a. A vertical workpiece support shaft 22 driven by the motor 21 is rotatably supported by a box-shaped support frame 6a via a bearing (not shown), and an upper end portion protrudes upward from a central portion of the upper surface. The work support shaft 22 has a center of rotation coincident with a reference line c1 that coincides with the center line of the toggle receiver 8, and a work support reference seat f1 having an annular horizontal surface is formed at the upper end portion. The small diameter portion 22a is formed around the reference line c1. A male spline portion g2 that is fitted to the female spline portion g1 of the workpiece w is formed in the small diameter portion 22a.
次に上記した研削盤１００の使用例及び作用について説明する。
図７はワークｗを示す図である。ワークｗは円盤体であって上側の表面（一方主面）ｗ１の外周縁に周方向へ高さが変化する環状突起ｈ１を有し、かつ下側の表面（他方主面）ｗ２の中央部に下方へ張り出した突出部ｈ２を有している。そして、ワークｗの中心位置には縦向きの透孔ｈ３が形成され、該透孔ｈ３の内周面に雌スプライン部ｇ１が形成されている。
Next, the usage example and effect | action of the above-mentioned grinding machine 100 are demonstrated.
FIG. 7 is a diagram showing the workpiece w. The workpiece w is a disc body and has an annular protrusion h1 whose height changes in the circumferential direction on the outer peripheral edge of the upper surface (one main surface) w1, and the central portion of the lower surface (other main surface) w2. Has a protrusion h2 projecting downward. A vertical through hole h3 is formed at the center position of the workpiece w, and a female spline portion g1 is formed on the inner peripheral surface of the through hole h3.
このような形態のワークｗは突出部ｈ２と環状突起ｈ１との間である領域が肉薄となっているため、中心線ｊ１方向の外力に対する該領域の剛性が他部分に較べ小さい。ワークｗの他方主面ｗ２のうち突出部ｈ２より外方となる領域が研削盤により研削される研削予定箇所ｍ１である。 Since the area between the protrusion h2 and the annular protrusion h1 is thin in the workpiece w having such a configuration, the rigidity of the area with respect to the external force in the direction of the center line j1 is smaller than that of the other parts. Of the other main surface w2 of the workpiece w, a region outside the projecting portion h2 is a planned grinding location m1 to be ground by the grinding machine.
ワークｗの加工に際して、先ず、ワークｗを一点鎖線ｎ１のように移動させてワーク支持軸２２の細径部２２ａの雄スプライン部ｇ２にワークｗの雌スプライン部ｇ１を外嵌させ突出部ｈ２の下端面を基準座ｆ１に当接させた状態とする。 When processing the workpiece w, first, the workpiece w is moved as indicated by the alternate long and short dash line n1, and the female spline portion g1 of the small diameter portion 22a of the workpiece support shaft 22 is externally fitted to the protruding portion h2. The lower end surface is brought into contact with the reference seat f1.
次に、心押台５を降下させ、押圧部材１３の前端面がワークｗの周縁部の環状突起ｈ１の上面に当接して案内孔１０ｂに押し込まれて行く。そして、トグル受体８のプッシャー８ｄがワークｗの一方主面ｗ１の中央部に当接する。図８Ａはこの時点の状態を示している。この時点ではトグル受体８は押圧本体部７に対し上方向へ変位可能であり、また各押圧部材１３は環状突起ｈ１の上面に倣った位置状態となっている。そしてトグル駒１６の水平面（基準線ｃ１に対して垂直な面）に対する傾斜角度θ１は心押台５がワーク供給時の位置にあるときのそれに合致している。 Next, the tailstock 5 is lowered, and the front end surface of the pressing member 13 comes into contact with the upper surface of the annular protrusion h1 at the peripheral edge of the workpiece w and is pushed into the guide hole 10b. Then, the pusher 8d of the toggle receiver 8 comes into contact with the central portion of the one main surface w1 of the workpiece w. FIG. 8A shows the state at this point. At this time, the toggle receiver 8 can be displaced upward with respect to the pressing main body portion 7, and each pressing member 13 is in a position state following the upper surface of the annular protrusion h1. The inclination angle θ1 of the toggle piece 16 with respect to the horizontal plane (a plane perpendicular to the reference line c1) matches that when the tailstock 5 is at the position during workpiece supply.
さらに、心押台５を降下させると、圧縮スプリング２０の下向きの弾力に抗しつつトグル受体８が、押圧本体部７に対して相対的に上昇する。この結果、６つのトグル駒１６は連動し、各トグル駒１６を外側の球体１６ａ及び内側の球体１６ｂのそれぞれを回動中心として縦面に沿うように漸次に傾斜変位させる。これにより水平面に対するその傾斜角θ１が漸減に基準線ｃ１に対して垂直に近くなる。トグル受体８の押圧本体部７に対する変位が増大する過程で、各トグル駒１６はその対応する押圧部材１３をトグル受体８の半径方向外側へ漸次増大する力で押圧するようになり、やがて、全ての押圧部材１３はロックされた状態となる。図８Ｂはこの時点の状態を示している。この時点ではトグル受体８は全ての押圧部材１３及び押圧本体部７に一体状に締結されており、トグル駒１６の水平面に対する傾斜角度θ２は傾斜角度θ１より小さくなっている。 Further, when the tailstock 5 is lowered, the toggle receiver 8 rises relative to the pressing main body portion 7 against the downward elasticity of the compression spring 20. As a result, the six toggle pieces 16 are interlocked, and each toggle piece 16 is gradually tilted and displaced along the vertical plane with the outer sphere 16a and the inner sphere 16b as rotation centers. As a result, the inclination angle θ1 with respect to the horizontal plane gradually decreases and becomes nearly perpendicular to the reference line c1. In the process in which the displacement of the toggle receiver 8 relative to the pressing body 7 increases, each toggle piece 16 presses the corresponding pressing member 13 with a force gradually increasing outward in the radial direction of the toggle receiver 8. All the pressing members 13 are locked. FIG. 8B shows the state at this point. At this time, the toggle receiver 8 is integrally fastened to all the pressing members 13 and the pressing main body portion 7, and the inclination angle θ2 of the toggle piece 16 with respect to the horizontal plane is smaller than the inclination angle θ1.
次にワークｗの下方へ離間した待機位置に位置されていた砥石３ｂを砥石ユニット３の上方変位によりワークｗに近接させ、砥石３ｂを砥石軸３ａ回りへ図示しないモータにより回転させて研削を行う。
研削の過程で砥石３ｂがワークｗを押圧するが、押圧部材１３で受け止められる。
Next, grinding is performed by bringing the grindstone 3b located at the standby position spaced below the workpiece w close to the workpiece w by the upward displacement of the grindstone unit 3 and rotating the grindstone 3b around the grindstone shaft 3a by a motor (not shown). .
The grindstone 3b presses the workpiece w in the grinding process, but is received by the pressing member 13.
ワークｗの研削が終了した後は、心押台５を上昇変位させる。これにより、トグル受体８は圧縮スプリング２０の弾力により押圧本体部７に対し下方へ移動し、トグル駒１６の傾斜角θ２が元の大きさθ1になり、全ての押圧部材１３のロック状態が解放され、押圧部材１３のそれぞれは圧縮スプリング１５の弾力で押圧本体部７に対し下方へ変位され図３に示す状態に復帰される。 After grinding the workpiece w, the tailstock 5 is displaced upward. As a result, the toggle receiver 8 moves downward with respect to the pressing main body portion 7 due to the elasticity of the compression spring 20, the inclination angle θ2 of the toggle piece 16 becomes the original size θ1, and all the pressing members 13 are locked. Each of the pressing members 13 is released and is displaced downward with respect to the pressing main body portion 7 by the elasticity of the compression spring 15 to return to the state shown in FIG.
上記のような研削盤１００によるワークｗの研削を長期に亘り実施すると、トグル受体８、押圧部材１３、トグル駒１６及び調整ネジ１８などの摺接箇所の摩耗が進行する。この摩耗の進行は、押圧部材１３が押圧本体部７に押圧され固定された状態になる時点のトグル受体８の位置が押圧本体部７に対し上方へずれる現象を生じさせる。そして、この現象が水平面に対するトグル駒１６の傾斜角度θ１を漸減させるようになる。その結果、トグル受体８からトグル駒１６に付与される上向き力に基づき押圧部材１３を押圧するように作用する水平力が増大される傾向となる。即ち、トグル受体８、押圧部材１３及びトグル駒１６などの摩耗の進行に伴って水平力が漸次に増大され、ワーク保持装置３００によるワークｗの位置保持能力が漸次に強化されるのである。 When the workpiece w is ground by the grinder 100 as described above over a long period of time, wear of sliding contact portions such as the toggle receiver 8, the pressing member 13, the toggle piece 16, and the adjusting screw 18 proceeds. The progress of the wear causes a phenomenon in which the position of the toggle receiver 8 at the time when the pressing member 13 is pressed and fixed to the pressing main body portion 7 is shifted upward with respect to the pressing main body portion 7. This phenomenon gradually reduces the inclination angle θ1 of the toggle piece 16 with respect to the horizontal plane. As a result, the horizontal force acting to press the pressing member 13 based on the upward force applied from the toggle receiver 8 to the toggle piece 16 tends to increase. That is, as the wear of the toggle receiver 8, the pressing member 13, and the toggle piece 16 progresses, the horizontal force is gradually increased, and the position holding capability of the workpiece w by the workpiece holding device 300 is gradually strengthened.
上記実施例では、基準線ｃ１を縦向きとしてワーク押圧具４００の押圧方向やワーク支持軸２２の支持方向を縦向きとしたが、これに限定するものではなく例えば横向きとしても差し支えない。 In the above embodiment, the reference line c1 is set to the vertical direction, and the pressing direction of the work pressing tool 400 and the support direction of the work support shaft 22 are set to the vertical direction. However, the present invention is not limited to this.
さらにワーク押圧具４００は、工作機械に限らず他の一般機械器具全般において既述したところに準じた作用効果の得られるよう使用することも可能であり、このような使用も本発明の実施の範囲内である。 Furthermore, the workpiece pressing tool 400 can be used not only for machine tools but also for other general machine tools in general so as to obtain the effects similar to those described above. Within range.
４００ ワーク押圧具
７ 押圧本体部
８ トグル受体
８ｄ プッシャー
１３ 押圧部材
１５ 圧縮スプリング
１６ トグル駒
１８ 調整ネジ
２０ 圧縮スプリング
ｃ１ 基準線
400 Work pressing tool 7 Pressing body part 8 Toggle receiver 8d Pusher 13 Pressing member 15 Compression spring 16 Toggle piece 18 Adjustment screw 20 Compression spring c1 Reference line
Claims (5)
前記基準線の周りに周壁で取り囲み、前記周壁には基準線方向に開口した案内孔が複数設けられた押圧本体部と、
前記周壁で取り囲まれた空間内に、前記基準線方向に相対移動可能に配置されたトグル受体と、
前記基準線方向の複数孔に夫々が配置され、前記開口を介して前記基準線方向に突出してワークに対して進退可能な複数の押圧部材と、
一端が前記トグル受体に当接し、前記周壁に設けられた前記案内孔に貫通する孔を介して他端が前記押圧部材に当接した棒状のトグル駒とを有し、
前記トグル受体が前記押圧本体部に対して相対移動したときに、前記基準線に対して当初斜めであった複数のトグル駒の姿勢が、前記基準線に対して垂直に近づくことにより、前記トグル駒を前記押圧部材に押し付けて固定することを特徴とする工作機械に使用されるワーク押圧具。 A pusher that presses the workpiece to be ground in the center of the opposite side in the direction of the reference line;
A pressing main body portion that is surrounded by a peripheral wall around the reference line, and the peripheral wall is provided with a plurality of guide holes that open in the reference line direction;
A toggle receiver disposed in a space surrounded by the peripheral wall so as to be relatively movable in the direction of the reference line;
A plurality of pressing members, each of which is disposed in the plurality of holes in the reference line direction, protrudes in the reference line direction through the opening, and can advance and retreat with respect to the workpiece;
A rod-shaped toggle piece whose one end is in contact with the toggle receiver and whose other end is in contact with the pressing member through a hole penetrating the guide hole provided in the peripheral wall;
When the toggle receiver moves relative to the pressing main body, the plurality of toggle pieces, which are initially oblique with respect to the reference line, approach the perpendicular line with respect to the reference line. A work pressing tool used in a machine tool, wherein a piece is pressed against and fixed to the pressing member.
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| DE3425275A1 (en) * | 1984-07-10 | 1986-01-16 | Optima-Spanntechnik GmbH, 5900 Siegen | CLAMPING DEVICE |
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| JP4204586B2 (en) * | 2005-12-15 | 2009-01-07 | 日清工業株式会社 | Work holding device and grinding device provided with the same |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |