JP4788132B2 - Grinding wheel apparatus and grinding machine equipped with the same - Google Patents
Grinding wheel apparatus and grinding machine equipped with the same Download PDFInfo
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- JP4788132B2 JP4788132B2 JP2004343127A JP2004343127A JP4788132B2 JP 4788132 B2 JP4788132 B2 JP 4788132B2 JP 2004343127 A JP2004343127 A JP 2004343127A JP 2004343127 A JP2004343127 A JP 2004343127A JP 4788132 B2 JP4788132 B2 JP 4788132B2
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Description
本発明は、例えば、円筒状のワークを研削する砥石車装置及びこれを備えた研削盤に関する。 The present invention relates to a grinding wheel device that grinds a cylindrical workpiece, for example, and a grinding machine equipped with the grinding wheel device.
例えば、工作機械としての研削盤は、ワークテーブル及び砥石台を搭載するベッドと、回転駆動装置によって回転駆動可能な砥石軸及びワークを研削する砥石車を有する砥石車装置とを備え、全体の駆動がコンピュータ数値制御(CNC)装置によって制御される。 For example, a grinding machine as a machine tool includes a bed on which a work table and a grindstone table are mounted, a grindstone shaft having a grindstone shaft that can be rotationally driven by a rotational drive device, and a grindstone device that grinds the workpiece, and the entire drive Are controlled by a computer numerical control (CNC) device.
従来、この種の研削盤においては、砥石車の取り付け・取り外し(交換)や保守・点検の作業性が容易であることから、砥石軸を砥石台に対して回転可能に片持ち支持してなるものが採用されている(例えば、特許文献1参照。)。 Conventionally, in this type of grinding machine, the grinding wheel shaft is cantilevered so as to be rotatable with respect to the grinding wheel base because it is easy to attach / remove (replace) the grinding wheel and perform maintenance / inspection. The thing is employ | adopted (for example, refer patent document 1).
このような研削盤においては、砥石軸の剛性を高くし、安定した研削加工を実現することが要求される。 In such a grinding machine, it is required to increase the rigidity of the grinding wheel shaft and realize stable grinding.
ところで、研削盤においては、近年における砥石車の小型化(小径化)に伴い、砥石車(砥粒層)の加工量(加工時間)を十分に確保する面から、またワークテーブル上の心押し台等との干渉を回避するために、砥石軸を支持する軸受の外径をできるだけ縮小することが行われる。
しかし、特許文献1に示す研削盤においては、軸径の外径を縮小すると、砥石軸の軸径が縮小され、その剛性・負荷容量が低下するため、荒研削時に砥石軸が過度に撓み、安定した粗研削加工を行うことができないという問題がある。このことは、精(仕上げ)研削時と比べ粗(荒)研削時において顕著である。 However, in the grinding machine shown in Patent Document 1, when the outer diameter of the shaft diameter is reduced, the shaft diameter of the grindstone shaft is reduced, and its rigidity and load capacity are reduced. Therefore, the grindstone shaft is excessively bent during rough grinding, There is a problem that stable rough grinding cannot be performed. This is more noticeable during rough (rough) grinding than during fine (finish) grinding.
本発明は、このような事情に鑑みてなされたもので、荒研削時に砥石軸における過度の撓み発生を防止することができ、もって安定した粗研削加工を行うことができる砥石車装置及びこれを備えた研削盤を提供する。 The present invention has been made in view of such circumstances, and can provide a grinding wheel device that can prevent excessive bending of the grinding wheel shaft during rough grinding, and can perform stable rough grinding. Provided with a grinding machine.
(1)本発明(第1の発明)の砥石車装置は、砥石台に対して回転可能に片持ち支持され、回転駆動装置によって回転駆動可能な砥石軸と、前記砥石軸の自由端部に取り付けられ、ワークを研削する砥石車とを備えた砥石車装置であって、前記砥石軸のワーク反加工領域側への移動を規制するための移動規制手段をさらに備え、前記移動規制手段は、前記砥石軸の外周面に接触可能な形状を有し、前記砥石台に前記砥石軸と平行な支持軸を有する回転体であり、前記支持軸は、前記砥石軸と平行な仮想線に沿って進退可能に前記砥石台に対し配設されていることを特徴とする。
第1の発明の砥石車装置によれば、ワークの粗研削加工時には砥石軸が研削抵抗によってワーク反加工領域側に撓むと、この撓み力を受けてその一部を矯正するような作用力を移動規制手段が砥石軸に付与し、砥石軸のワーク反加工領域側への移動が規制される。これにより、粗研削時に砥石軸における過度の撓み発生を防止することができ、安定した粗研削加工を高能率で行うことができる。一方、精研削時には、研削抵抗が小さいため、砥石軸が移動規制手段に当接するような撓みが発生せず、砥石軸のみの安定した回転動作となり、精度の高い研削加工を行うことができる。
このように構成されているため、粗研削時に砥石軸の当接によって回転体が回転すると、砥石軸の回転駆動力を大きく増加させることなく砥石軸の受ける研削抵抗が低減できる。
このように構成されているため、砥石軸に対して移動規制手段を接近させるには、支持軸を仮想線に沿って砥石軸側に進行させることになる。一方、砥石軸側から移動規制手段を離間させるには、支持軸を仮想線に沿って砥石軸側から退避させることになる。これにより、砥石車の交換時には、移動規制手段を砥石軸から離間する方向に移動させると、砥石車を交換するための十分なスペースを移動規制手段と砥石軸との間に確保することができる。
(1) A grinding wheel device according to the present invention (first invention) is cantilevered so as to be rotatable with respect to a grinding wheel table, and can be driven to rotate by a rotation driving device, and a free end of the grinding wheel shaft. A grinding wheel device equipped with a grinding wheel for grinding a workpiece, the grinding wheel device further comprising movement restriction means for restricting movement of the grinding wheel shaft to the workpiece opposite processing region side, the movement restriction means, It is a rotating body having a shape that can contact the outer peripheral surface of the grindstone shaft and having a support shaft parallel to the grindstone shaft on the grindstone base, and the support shaft is along a virtual line parallel to the grindstone axis It is arranged relative to the grindstone table so as to be able to advance and retreat .
According to the grinding wheel device of the first aspect of the present invention, when the grinding wheel shaft is bent toward the workpiece counter-working region side by grinding resistance during rough grinding of the workpiece, an acting force that corrects a part thereof by receiving this bending force is obtained. The movement restricting means is applied to the grindstone shaft, and the movement of the grindstone shaft toward the workpiece counter machining area is restricted. Thereby, the excessive bending generation | occurrence | production in a grindstone axis | shaft at the time of rough grinding can be prevented, and the stable rough grinding process can be performed with high efficiency. On the other hand, since the grinding resistance is small at the time of precise grinding, the grinding wheel shaft does not bend so as to come into contact with the movement restricting means, and only the grinding wheel shaft is stably rotated, so that highly accurate grinding can be performed.
Because of this configuration, when the rotating body rotates due to the contact of the grindstone shaft during rough grinding, the grinding resistance received by the grindstone shaft can be reduced without greatly increasing the rotational driving force of the grindstone shaft.
Since it is comprised in this way, in order to make a movement control means approach with respect to a grindstone axis | shaft, a support shaft will be advanced to the grindstone axis | shaft side along a virtual line. On the other hand, in order to separate the movement restricting means from the grindstone shaft side, the support shaft is retracted from the grindstone shaft side along the virtual line. Thereby, when exchanging the grinding wheel, if the movement restricting means is moved in the direction away from the grindstone shaft, a sufficient space for exchanging the grinding wheel can be secured between the movement restricting means and the grindstone shaft. .
(2)上記(1)に記載の砥石車装置において、前記移動規制手段は、前記砥石軸の外周円上に同一面内における前記砥石車の軸心とワーク研削点とを結ぶ仮想延長線から等間隔をもって互いに並列する一対のローラからなることが好ましい。
このように構成されているため、粗研削時に砥石軸からの負荷抵抗が一対のローラに均等に分散され、バランスの良好な砥石軸の回転動作を得ることができる。
( 2 ) In the grinding wheel device according to the above (1 ), the movement restricting means is based on a virtual extension line connecting an axis of the grinding wheel and a workpiece grinding point in the same plane on an outer circumference circle of the grinding wheel shaft. It is preferably composed of a pair of rollers arranged in parallel with each other at equal intervals.
Since it is configured in this manner, the load resistance from the grindstone shaft is evenly distributed to the pair of rollers during rough grinding, and a rotating operation of the grindstone shaft with a good balance can be obtained.
(3)上記(1)又は(2)に記載の砥石車装置において、前記支持軸は、前記砥石台に軸受を介して回転可能に支承されていることが好ましい。
このように構成されているため、支持軸が砥石台に軸受を介して回転することにより、砥石軸の回転駆動力を大きく増加させることなく砥石軸の受ける研削抵抗が低減できる。
( 3 ) In the grinding wheel device according to ( 1 ) or ( 2 ), it is preferable that the support shaft is rotatably supported by the grinding wheel platform via a bearing.
Since it is constituted in this way, the grinding resistance which a whetstone axis receives can be reduced, without greatly increasing the rotational driving force of a whetstone axis by rotating a support axis to a whetstone stand via a bearing.
(4)本発明(第2の発明)の研削盤は、砥石台に対して回転可能に片持ち支持され、回転駆動装置によって回転駆動可能な砥石軸と、前記砥石軸の自由端部に取り付けられ、ワークを研削する砥石車とを有する砥石車装置を備えた研削盤であって、前記砥石車装置は、上記(1)から(3)のいずれかに記載の砥石車装置であることを特徴とする。
第2の発明の研削盤によれば、ワークの粗研削加工時には砥石軸が研削抵抗によってワーク反加工領域側に撓むと、この撓み力を受けてその一部を矯正するような作用力をローラが砥石軸に付与し、砥石軸のワーク反加工領域側への移動が規制される。これにより、安定した粗研削加工を高能率に行うことができる研削盤が得られる。一方、精研削時には、研削抵抗が小さいため砥石軸がローラに当接するような撓みが発生せず、砥石軸のみの安定した回転動作となり、精度の高い研削加工を行うことができる。
( 4 ) The grinding machine of the present invention (second invention) is mounted on the grindstone shaft that is cantilevered and supported rotatably with respect to the grindstone table, and can be rotationally driven by a rotation driving device, and the free end of the grindstone shaft. And a grinding wheel having a grinding wheel device that grinds a workpiece, wherein the grinding wheel device is the grinding wheel device according to any one of (1) to ( 3 ) above. Features.
According to the grinding machine of the second aspect of the present invention, when the grinding wheel shaft is bent toward the workpiece counter-working region side by the grinding resistance during the rough grinding of the workpiece, the roller is applied with an acting force that receives this bending force and corrects a part thereof. Is applied to the grindstone shaft, and the movement of the grindstone shaft toward the workpiece counter-working region is restricted. As a result, a grinding machine capable of performing stable rough grinding with high efficiency can be obtained. On the other hand, at the time of fine grinding, since the grinding resistance is small, the grinding wheel shaft does not bend such that the grinding wheel shaft comes into contact with the roller, and only the grinding wheel shaft is stably rotated, so that highly accurate grinding can be performed.
(実施の形態)
以下、本発明の実施の形態につき、図面に基づいて説明する。
図1は、本発明の実施の形態に係る砥石車装置を備えた研削盤(円筒研削盤)を示す平面図である。図2は、本発明の実施の形態に係る砥石車装置を示す断面図である。図3は、本発明の実施の形態に係る砥石車装置における移動規制部材によって砥石軸が移動規制された状態を示す断面図である。図4は、本発明の実施の形態に係る砥石車装置における移動規制手段の進退動作を説明するために示す断面図であり、図4(a)は、非研削位置における移動規制手段を示す断面図、図4(b)は、研削位置における移動規制手段を示す断面図である。
(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a grinding machine (cylindrical grinding machine) provided with a grinding wheel device according to an embodiment of the present invention. FIG. 2 is a sectional view showing the grinding wheel device according to the embodiment of the present invention. FIG. 3 is a cross-sectional view showing a state where the movement of the grinding wheel shaft is restricted by the movement restricting member in the grinding wheel device according to the embodiment of the present invention. FIG. 4 is a cross-sectional view for explaining the advance / retreat operation of the movement restricting means in the grinding wheel device according to the embodiment of the present invention, and FIG. 4 (a) is a cross section showing the movement restricting means in the non-grinding position. FIG. 4 and FIG. 4B are cross-sectional views showing the movement restricting means at the grinding position.
(各部の構成)
図1において、円筒研削盤1は、基台部としてのベッド2と、ワークWを研削加工するための砥石車装置3と、砥石車装置3における砥石軸31のワーク反加工領域A側への移動を規制するための移動規制部4と、ワークWを支持して回転駆動するためのワーク支持・回転駆動装置5と、ワーク支持・回転駆動装置5及び砥石車装置3等を駆動制御するNC(数値制御)装置(図示せず)とによって大略構成されている。
(Configuration of each part)
In FIG. 1, a cylindrical grinding machine 1 includes a bed 2 as a base, a grinding wheel device 3 for grinding a workpiece W, and a grinding wheel shaft 31 in the grinding wheel device 3 toward a workpiece rework area A side. An NC for driving and controlling the movement regulating unit 4 for regulating movement, the workpiece support / rotation drive device 5 for supporting and rotating the workpiece W, the workpiece support / rotation drive device 5 and the grinding wheel device 3 and the like. (Numerical control) It is roughly constituted by a device (not shown).
ベッド2上には、図1に示すように、第1移動装置(図示せず)によって±X軸方向に進退可能な砥石台21及び第2移動装置(図示せず)によって±Z軸方向に進退可能なワークテーブル22が搭載されている。 On the bed 2, as shown in FIG. 1, a grindstone base 21 that can be advanced and retracted in the ± X-axis direction by a first moving device (not shown) and a ± Z-axis direction by a second moving device (not shown). A work table 22 that can be advanced and retracted is mounted.
砥石車装置3は、図1に示すように、砥石軸31及び砥石車32を有し、砥石台21上に配設されている。そして、回転駆動モータ(図示せず)によって駆動されるように構成されている。 As shown in FIG. 1, the grinding wheel device 3 includes a grinding wheel shaft 31 and a grinding wheel 32, and is disposed on the grinding wheel base 21. And it is comprised so that it may drive with a rotational drive motor (not shown).
砥石軸31は、図2に示すように、砥石台21上に軸受33を介して回転可能に片持ち支持され、各外径が互いに異なる複数の軸部31A〜31C等を有する段付きシャフトによって形成されている。そして、回転駆動装置(砥石車装置3の回転駆動モータ)によって回転駆動されるように構成されている。 As shown in FIG. 2, the grindstone shaft 31 is supported by a cantilever rotatably supported on a grindstone table 21 via a bearing 33, and has a stepped shaft having a plurality of shaft portions 31 </ b> A to 31 </ b> C having different outer diameters. Is formed. And it is comprised so that it may be rotationally driven by the rotational drive apparatus (rotary drive motor of the grinding wheel apparatus 3).
軸部31Aは、他の軸部31B,31Cの外径より大きい外径をもち、流体軸受等の軸受33に回転可能に支承されている。軸部31Aの反砥石車側端部にはプーリ506が固着されている。これにより、回転駆動装置(砥石車装置3の回転駆動モータ)からの回転駆動力が伝達ベルト507を介してプーリ506に伝達され、このプーリ506の回転によって砥石軸31が回転駆動される。軸部31Aの反プーリ側端面の周縁部には、砥石車32のプーリ側への移動を規制するホイールストッパ34が設けられている。また、軸部31Aの反プーリ側端面部(ホイールストッパ側端面部)には、円周方向に等間隔をもって並列する複数(図2では2個)のボルト取付孔35,35,…が設けられている。 The shaft portion 31A has an outer diameter larger than the outer diameter of the other shaft portions 31B and 31C, and is rotatably supported by a bearing 33 such as a fluid bearing. A pulley 506 is fixed to the end of the shaft portion 31A on the side opposite to the grinding wheel. Thereby, the rotational driving force from the rotational driving device (the rotational driving motor of the grinding wheel device 3) is transmitted to the pulley 506 via the transmission belt 507, and the grinding wheel shaft 31 is rotationally driven by the rotation of the pulley 506. A wheel stopper 34 that restricts the movement of the grinding wheel 32 toward the pulley is provided on the peripheral edge of the end surface on the side opposite to the pulley of the shaft portion 31A. Further, a plurality (two in FIG. 2) of bolt mounting holes 35, 35,... Arranged in parallel at equal intervals in the circumferential direction are provided on the end surface portion on the non-pulley side (end surface portion on the wheel stopper side) of the shaft portion 31A. ing.
軸部31Bは、軸部31Aの外径と軸部31Cの外径の中間寸法の外径をもち、軸部31Aの反プーリ側端面の中央部に連設されている。 The shaft portion 31B has an outer diameter that is an intermediate dimension between the outer diameter of the shaft portion 31A and the outer diameter of the shaft portion 31C, and is connected to the central portion of the end surface on the side opposite to the pulley of the shaft portion 31A.
軸部31Cは、他の軸部31A,31Bの各外径より小さい外径をもち、軸部31Bの反プーリ側端面の中央部に連設されている。 The shaft portion 31C has an outer diameter smaller than the outer diameters of the other shaft portions 31A and 31B, and is connected to the central portion of the end surface on the side opposite to the pulley of the shaft portion 31B.
砥石車32は、図2に示すように、ホイール32A及び砥粒層32Bを有し、砥石軸31の自由端部(軸部31A)にボルト36によって取り付けられている。そして、砥石軸31と共に回転駆動されるように構成されている。 As shown in FIG. 2, the grinding wheel 32 has a wheel 32 </ b> A and an abrasive grain layer 32 </ b> B, and is attached to a free end portion (shaft portion 31 </ b> A) of the grinding wheel shaft 31 by a bolt 36. And it is comprised so that it may be rotationally driven with the grindstone axis | shaft 31. FIG.
ホイール32Aは、全体が環状板からなり、そのホイール片側端面をホイールストッパ34に圧接して砥石軸31の軸部31Bに保持されている。ホイール32Aには、複数のボルト取付孔35,35,…にそれぞれ対応する複数のボルト挿通孔32a,32a,…が設けられている。 The wheel 32 </ b> A is entirely formed of an annular plate, and is held by the shaft portion 31 </ b> B of the grindstone shaft 31 with the wheel one side end face being pressed against the wheel stopper 34. The wheel 32A is provided with a plurality of bolt insertion holes 32a, 32a,... Corresponding to the plurality of bolt mounting holes 35, 35,.
砥粒層32Bは、ホイール32Aの外周面に配設され、砥石車32(砥石軸31)の回転によってワークWを研削するように構成されている。 The abrasive grain layer 32B is disposed on the outer peripheral surface of the wheel 32A, and is configured to grind the workpiece W by the rotation of the grinding wheel 32 (grinding wheel shaft 31).
移動規制部4は、図3に示すように移動規制部材としての1対のローラ40,41を有する回転手段からなり、砥石台21に流体軸受等の軸受42(図2に示す)を介して回転可能に支承されている。このため、粗研削時に矢印M方向に回転する砥石軸31(軸部31C)が研削抵抗によって図3に2点鎖線で示す位置から図3に実線で示す位置に移動すると、砥石軸31から受ける回転接触抵抗によってローラ40,41が矢印m,n方向にそれぞれ回転することになる。これにより、砥石軸31の当接によってローラ40,41が回転すると、砥石軸31の受けるローラ40,41からの研削抵抗を低減できる。 As shown in FIG. 3, the movement restricting portion 4 is composed of a rotating means having a pair of rollers 40 and 41 as movement restricting members. It is supported so that it can rotate. For this reason, when the grindstone shaft 31 (shaft portion 31C) rotating in the arrow M direction during rough grinding is moved from the position indicated by the two-dot chain line in FIG. 3 to the position indicated by the solid line in FIG. The rollers 40 and 41 are rotated in the directions of arrows m and n by the rotational contact resistance, respectively. Thereby, when the rollers 40 and 41 are rotated by the contact of the grindstone shaft 31, the grinding resistance from the rollers 40 and 41 received by the grindstone shaft 31 can be reduced.
ローラ40,41は、図3に示すように、砥石軸31(軸部31C)の外周面31cに接触可能な外周面40a,41aを有し、支持軸43A,43Bに軸支されており、砥石軸31の外周円上に同一面(仮想面)内における砥石車32の軸心Oとワーク研削点Pとを結ぶ仮想延長線aから等間隔をもって互いに並列する位置に配設されている。これにより、粗研削時に仮想延長線a上を移動する砥石軸31がその負荷抵抗をローラ40,41に均等に分散して当接するため、バランスの良好な砥石軸31の回転動作を得ることができる。 As shown in FIG. 3, the rollers 40 and 41 have outer peripheral surfaces 40a and 41a that can contact the outer peripheral surface 31c of the grindstone shaft 31 (shaft portion 31C), and are supported by the support shafts 43A and 43B. On the outer circumference of the grindstone shaft 31, they are arranged at positions parallel to each other at equal intervals from a virtual extension line a that connects the axis O of the grinding wheel 32 and the workpiece grinding point P in the same plane (virtual plane). As a result, the grindstone shaft 31 that moves on the virtual extension line a during rough grinding abuts the load resistance evenly distributed on the rollers 40 and 41, so that the rotating operation of the grindstone shaft 31 with good balance can be obtained. it can.
支持軸43A,43Bは、砥石軸31と平行な仮想線bに沿って軸受42と共に進退可能に砥石台21に対し配設されている。このため、図4(a)に示す退避位置にあるローラ40,41(ローラ41のみ図示)を砥石軸31に対して接近させるには、砥石軸31に砥石車32を取り付けた後に、ローラ40,41を軸受42と共に仮想線aに沿って図4(b)に示す進行位置に移動させることになる。 The support shafts 43 </ b> A and 43 </ b> B are disposed with respect to the grindstone table 21 so as to be able to advance and retreat together with the bearing 42 along a virtual line b parallel to the grindstone shaft 31. For this reason, in order to make the rollers 40 and 41 (only the roller 41 shown) in the retracted position shown in FIG. 4A approach the grinding wheel shaft 31, the roller 40 is attached after the grinding wheel 32 is attached to the grinding wheel shaft 31. , 41 together with the bearing 42 are moved along the virtual line a to the advancing position shown in FIG.
一方、図4(b)に示す進行位置にあるローラ40,41を砥石軸31から離間させるには、ローラ40,41を軸受42共に仮想線bに沿って図4(a)に示す退避位置に移動させることになる。これにより、砥石車32の交換時には、ローラ40,41を砥石軸31から離間する方向に軸受42と共に移動させると、図4(a)に示すように砥石車32を交換するための十分なスペースSをローラ40,41と砥石軸31との間に確保することができる。 On the other hand, in order to separate the rollers 40 and 41 in the advancing position shown in FIG. 4B from the grindstone shaft 31, the rollers 40 and 41 together with the bearing 42 are retracted positions shown in FIG. Will be moved to. Thus, when the grinding wheel 32 is replaced, if the rollers 40 and 41 are moved together with the bearing 42 in a direction away from the grinding wheel shaft 31, sufficient space for replacing the grinding wheel 32 as shown in FIG. S can be secured between the rollers 40 and 41 and the grindstone shaft 31.
ワーク支持・回転駆動装置5は、図1に示すように、主軸台5A及び心押し台5Bを有し、ワークテーブル22上に搭載されている。そして、ワークWを支持して回転駆動するように構成されている。 As shown in FIG. 1, the work support / rotation drive device 5 includes a spindle stock 5 </ b> A and a tailstock 5 </ b> B and is mounted on a work table 22. And it is comprised so that the workpiece | work W may be supported and rotationally driven.
主軸台5Aは、心押し台側に突出する主軸51及び主軸51を回転駆動する回転モータ(図示せず)を有し、ワークWを心押し台5Bと共に支持して回転駆動するように構成されている。 The headstock 5A includes a main shaft 51 protruding toward the tailstock and a rotation motor (not shown) that rotationally drives the main shaft 51, and is configured to support and rotate the workpiece W together with the tailstock 5B. ing.
心押し台5Bは、主軸側に突出するセンタ52を有し、ワークWを主軸台5Aと反対側から回転可能に支持するように構成されている。 The tailstock 5B has a center 52 that protrudes toward the main shaft, and is configured to support the workpiece W so as to be rotatable from the opposite side to the main shaft 5A.
NC装置(図示せず)は、ワークWの研削加工に際して実行される加工プログラムを格納するハードディスクを内蔵するコンピュータ数値制御(CNC)装置からなり、砥石台21の第1移動装置及びワークテーブル22の第2移動装置(共に図示せず)や、砥石車装置3及びワーク支持・回転駆動装置5等を駆動制御するように構成されている。 The NC device (not shown) includes a computer numerical control (CNC) device having a built-in hard disk for storing a machining program executed when the workpiece W is ground. The first moving device of the grindstone table 21 and the work table 22 The second moving device (both not shown), the grinding wheel device 3, the work support / rotation drive device 5 and the like are configured to be driven and controlled.
(本実施の形態におけるワークWの研削)
以上の構成により、本実施の形態の研削盤1において、図4(a)に示す状態の砥石車装置3によってワークWを研削するには、ローラ40,41(ローラ41のみ図示)を図4(b)に示す進行位置に軸受42と共に仮想線aに沿って移動させ、ローラ40,41を砥石軸31の周囲に配置してから行う。この場合、ワークの粗研削加工時には砥石軸31が研削抵抗によってワーク反加工領域A側に撓むと、この撓み力を受けてその一部を矯正するような作用力をローラ40,41が砥石軸31(軸部31C)に付与し、砥石軸31のワーク反加工領域A側への移動が規制される。
(Grinding of workpiece W in the present embodiment)
With the above configuration, in the grinding machine 1 of the present embodiment, in order to grind the workpiece W by the grinding wheel device 3 in the state shown in FIG. It moves after moving to the advancing position shown to (b) along the virtual line a with the bearing 42, and arrange | positioning the rollers 40 and 41 around the grindstone axis | shaft 31. In this case, when the grindstone shaft 31 is bent toward the workpiece counter-working region A side by the grinding resistance during the rough grinding of the workpiece, the rollers 40 and 41 receive the bending force to correct a part thereof. 31 (shaft portion 31 </ b> C) and the movement of the grindstone shaft 31 toward the workpiece counter machining area A is restricted.
(本実施の形態の効果)
上記した本実施の形態によると、砥石軸31においては常に許容範囲内の剛性・負荷容量となるので、粗研削時に砥石軸31における過度の撓み発生を防止することができ、安定した高能率の粗研削加工を行うことができる。
(Effect of this embodiment)
According to the above-described embodiment, the grinding wheel shaft 31 always has an allowable rigidity and load capacity, so that excessive bending of the grinding wheel shaft 31 during rough grinding can be prevented, and stable and highly efficient. Coarse grinding can be performed.
また、精研削時には、砥石軸31がローラ40,41に当接するような撓みが発生せず、砥石軸31のみの安定した回転動作となり、精度の高い研削加工を行うことができる。 Further, at the time of fine grinding, the grinding wheel shaft 31 is not bent so as to contact the rollers 40 and 41, and only the grinding wheel shaft 31 is stably rotated, so that the grinding process with high accuracy can be performed.
また、本実施の形態の研削盤1において、図4(b)に示す状態の砥石車装置3の砥石車32を交換するには、ローラ40,41を図4(a)に示す退避位置に軸受42と共に仮想線bに沿って移動させてから行う。この場合、ローラ40,41が軸受42と共に退避位置に配置されると、砥石車32を交換するための十分なスペースSをローラ40,41と砥石軸31との間に確保することができる。 Further, in the grinding machine 1 of the present embodiment, in order to replace the grinding wheel 32 of the grinding wheel device 3 in the state shown in FIG. 4B, the rollers 40 and 41 are moved to the retracted position shown in FIG. It is performed after moving along the virtual line b together with the bearing 42. In this case, when the rollers 40 and 41 are disposed at the retracted position together with the bearings 42, a sufficient space S for exchanging the grinding wheel 32 can be secured between the rollers 40 and 41 and the grinding wheel shaft 31.
なお、本発明の研削盤1(砥石車装置3)を上記の実施の形態に基づいて説明したが、本発明は上記の実施の形態に限定されるものではなく、その要旨を逸脱しない範囲において種々の態様において実施することが可能であり、例えば、次に示すような変形も可能である。 In addition, although the grinding machine 1 (grinding wheel device 3) of the present invention has been described based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and in a range not departing from the gist thereof. The present invention can be implemented in various modes, and for example, the following modifications are possible.
(1)上記実施の形態の砥石車装置3は、移動規制部4がローラ40,41のからなる場合について説明したが、本発明はこれに限定されず、例えば、球体や、砥石軸31の曲率と略同一の曲率をもつ軸受面を有するオイルレスメタル等の軸受からなるものでもよい。 (1) Although the grinding wheel device 3 of the above embodiment has been described with respect to the case where the movement restricting portion 4 is composed of the rollers 40 and 41, the present invention is not limited to this. It may be composed of a bearing such as an oilless metal having a bearing surface having a curvature substantially the same as the curvature.
(2)上記実施の形態の砥石車装置3は、砥石台21に支持軸43A,43Bを回転可能に支承する軸受42として流体軸受(すべり軸受)である場合について説明したが、本発明はこれに限定されず、転がり軸受(ラジアル軸受)であってもよく、粗研削時にローラ40,41の接触によって砥石車32による研削動作を妨げるものでないなら、他の軸受であっても差し支えない。 (2) Although the grinding wheel device 3 of the above embodiment has been described as a fluid bearing (slide bearing) as the bearing 42 for rotatably supporting the support shafts 43A and 43B on the grinding wheel base 21, the present invention is However, it may be a rolling bearing (radial bearing), and other bearings may be used as long as the grinding operation by the grinding wheel 32 is not hindered by the contact of the rollers 40 and 41 during rough grinding.
1…円筒研削盤、2…ベッド、3…砥石車装置、4…移動規制部、5…ワーク支持・回転駆動装置、5A…主軸台、5B…心押し台、21…砥石台、22…ワークテーブル、31…砥石軸、31A,31B,31C…軸部、31c…外周面、32…砥石車、32A…ホイール、32B…砥粒層、32a…ボルト挿通孔、33軸受、34…ホイールストッパ、35…ボルト取付孔、40,41…ローラ、40a,41a…外周面、42…軸受、43A,43B…支持軸、51…主軸、52…センタ、506…プーリ、507…伝達ベルト、A…ワーク反加工領域、a…仮想延長線、b…仮想線、M…砥石軸の回転方向、m…ローラ40の回転方向、n…ローラ41の回転方向、P…ワーク研削点、O…軸心、S…スペース、W…ワーク DESCRIPTION OF SYMBOLS 1 ... Cylindrical grinder, 2 ... Bed, 3 ... Grinding wheel apparatus, 4 ... Movement control part, 5 ... Work support / rotation drive device, 5A ... Spindle head, 5B ... Tailstock, 21 ... Grinding wheel base, 22 ... Workpiece Table, 31 ... Grinding wheel shaft, 31A, 31B, 31C ... Shaft, 31c ... Outer peripheral surface, 32 ... Grinding wheel, 32A ... Wheel, 32B ... Abrasive layer, 32a ... Bolt insertion hole, 33 bearing, 34 ... Wheel stopper, 35 ... bolt mounting hole, 40, 41 ... roller, 40a, 41a ... outer peripheral surface, 42 ... bearing, 43A, 43B ... support shaft, 51 ... main shaft, 52 ... center, 506 ... pulley, 507 ... transmission belt, A ... work Counter machining area, a ... virtual extension line, b ... virtual line, M ... rotation direction of grinding wheel axis, m ... rotation direction of roller 40, n ... rotation direction of roller 41, P ... workpiece grinding point, O ... axis, S ... Space, W ... Work
Claims (4)
前記砥石軸の自由端部に取り付けられ、ワークを研削する砥石車とを備えた砥石車装置であって、
前記砥石軸のワーク反加工領域側への移動を規制するための移動規制手段をさらに備え、
前記移動規制手段は、前記砥石軸の外周面に接触可能な形状を有し、前記砥石台に前記砥石軸と平行な支持軸を有する回転体であり、
前記支持軸は、前記砥石軸と平行な仮想線に沿って進退可能に前記砥石台に対し配設されていることを特徴とする砥石車装置。 A grindstone shaft that is cantilevered and rotatably supported by a grindstone base, and can be rotationally driven by a rotational drive device;
A grinding wheel device equipped with a grinding wheel that is attached to a free end of the grinding wheel shaft and grinds a workpiece,
A movement restricting means for restricting the movement of the grindstone shaft toward the workpiece re-working region side;
The movement restricting means is a rotating body having a shape capable of contacting an outer peripheral surface of the grindstone shaft, and having a support shaft parallel to the grindstone shaft on the grindstone base,
The grinding wheel device according to claim 1, wherein the support shaft is disposed with respect to the grinding wheel base so as to advance and retreat along a virtual line parallel to the grinding wheel shaft .
前記砥石軸の自由端部に取り付けられ、ワークを研削する砥石車とを有する砥石車装置を備えた研削盤であって、
前記砥石車装置は、請求項1から3のいずれか1項に記載の砥石車装置であることを特徴とする研削盤。 A grindstone shaft that is cantilevered and rotatably supported by a grindstone base, and can be rotationally driven by a rotational drive device;
A grinding machine provided with a grinding wheel device attached to a free end of the grinding wheel shaft and having a grinding wheel for grinding a workpiece,
The grinding wheel device according to any one of claims 1 to 3 , wherein the grinding wheel device is the grinding wheel device.
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