JP2011194561A - Chamfering device for disk-like workpiece - Google Patents

Chamfering device for disk-like workpiece Download PDF

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Publication number
JP2011194561A
JP2011194561A JP2010251142A JP2010251142A JP2011194561A JP 2011194561 A JP2011194561 A JP 2011194561A JP 2010251142 A JP2010251142 A JP 2010251142A JP 2010251142 A JP2010251142 A JP 2010251142A JP 2011194561 A JP2011194561 A JP 2011194561A
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Prior art keywords
chamfering
workpiece
grindstone
disk
shaft
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Japanese (ja)
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Takahiro Ueda
貴大 上田
Koichi Okuwa
幸一 大桑
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Nakamura Tome Precision Industry Co Ltd
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Nakamura Tome Precision Industry Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
    • B24B9/107—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass for glass plates while they are turning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/14—Zonally-graded wheels; Composite wheels comprising different abrasives

Abstract

PROBLEM TO BE SOLVED: To eliminate secondary grinding after chamfering by minimizing the occurrence of chipping generated at corners between chamfering faces and front and rear surfaces in a chamfering device for outer peripheral corners of a disk-like workpiece formed of a hard and brittle material.SOLUTION: The chamfering device for a disk-like workpiece includes upper and lower cup-like grinding wheels slidingly rubbing the outer peripheral corners on the upper surface side and the lower surface side of the disk-like workpiece held by a vertical rotary workpiece shaft, upper and lower chamfering grinding wheel shafts mounted with the upper and lower grinding wheels, and grinding wheel motors rotationally driving the grinding wheel shafts. The upper and lower grinding wheel shafts are arranged in a direction obliquely crossing three-dimensionally with an axis of the workpiece shaft so that peripheral edges of the upper and lower grinding wheels mounted thereon contact the upper and lower chamfering faces of the disk-like workpiece at one position respectively. The grinding wheel motors rotationally drive the grinding wheels toward the rotational direction with which both of the slindingly rubbing direction of the upper and lower grinding wheels at contact positions between the grinding wheels and the disk-like workpiece become the direction directed from the inner side to the outer side of the disk-like workpiece.

Description

この発明は、ＨＤＤ（ハードディスクドライブ）の記録媒体として広く用いられているガラスやセラミックスなどの硬質脆性材料からなる円盤状ワークの外周角の面取加工装置に関するものである。   The present invention relates to a chamfering device for an outer peripheral angle of a disk-shaped workpiece made of a hard brittle material such as glass or ceramics, which is widely used as a recording medium for HDD (Hard Disk Drive).

ＨＤＤの記録媒体として用いる円盤状のワークは、高い記録密度と安定した高速回転を実現するために、情報の記録面となる表裏面の高い面精度が要求されると共に、その外周部の加工においても、高い加工精度が要求される。従来、この種円盤状ワークの表裏面は、２回の研削加工（ラッピング）とその後の仕上げ研磨とによって加工されており、外周部は、外周研削と面取加工とによって加工されている。その一般的な加工順序は、表裏面の１次研削を行ったあと、外周研削と面取を行い、そのあと表裏面の２次研削を行って研磨仕上げするというものである。   In order to realize high recording density and stable high-speed rotation, disk-shaped workpieces used as HDD recording media require high surface accuracy on the front and back surfaces that serve as information recording surfaces. However, high processing accuracy is required. Conventionally, the front and back surfaces of this kind of disk-shaped workpiece have been processed by two times of grinding (lapping) and subsequent finish polishing, and the outer peripheral portion has been processed by outer peripheral grinding and chamfering. The general processing order is to perform primary grinding on the front and back surfaces, then perform peripheral grinding and chamfering, and then perform secondary grinding on the front and back surfaces to finish polishing.

外周角（表裏面と外周面との間の稜線）の面取加工は、従来、図８に示すように、総形砥石６を用いて行っている。すなわち、加工しようとする円盤状ワーク１を鉛直方向の回転ワーク軸１１の上端に水平に保持してその軸心回りに回転し、当該ワーク軸１１と平行な面取砥石軸６１に装着した総形砥石６を回転させて、砥石の外周に設けた台形溝６５に円盤状ワーク１の外周部を挿入することにより、上下の外周角を同時に面取するというものである。この場合の円盤状ワーク１の面取面１６における砥石６の摺擦方向は、図９に矢印ｄで示すように、円盤状ワーク１の円の接線方向である。   The chamfering of the outer peripheral angle (ridge line between the front and rear surfaces and the outer peripheral surface) is conventionally performed using a general-purpose grindstone 6 as shown in FIG. That is, the disc-like workpiece 1 to be machined is held horizontally at the upper end of the rotating workpiece shaft 11 in the vertical direction and rotated around its axis, and is attached to the chamfering grindstone shaft 61 parallel to the workpiece shaft 11. The upper and lower outer peripheral angles are chamfered simultaneously by rotating the shaped grindstone 6 and inserting the outer peripheral portion of the disc-like workpiece 1 into a trapezoidal groove 65 provided on the outer periphery of the grindstone. In this case, the rubbing direction of the grindstone 6 on the chamfered surface 16 of the disc-shaped workpiece 1 is a tangential direction of the circle of the disc-shaped workpiece 1 as indicated by an arrow d in FIG.

硬質脆性板の研削においては、研削面とこれに隣接する面との角の部分に微少な割れや欠け（チッピング）が発生する。図８に示した従来の面取加工においては、面取面１６と情報の記録面となる表裏面１７との間の角１８に５０ミクロン程度のチッピングが発生する可能性があった。このチッピングは、前述した２次研削加工の研削代と研磨代とからなる取り代を６０ミクロン程度とすることで除去していた。   In grinding a hard brittle plate, minute cracks and chips (chipping) occur at the corners between the ground surface and the adjacent surface. In the conventional chamfering process shown in FIG. 8, there is a possibility that chipping of about 50 microns occurs at a corner 18 between the chamfered surface 16 and the front and back surfaces 17 which are information recording surfaces. This chipping has been removed by setting the machining allowance consisting of the grinding allowance and polishing allowance of the above-described secondary grinding process to about 60 microns.

特開２００５−２７１１０５号公報JP-A-2005-271105

円盤状ワークの生産性を向上させ、円盤状ワークをより安価に提供できるようにするために、円盤状ワークの加工工程の短縮化が要望されている。例えば、上記の加工において、研削加工を１工程にできないかという要望がある。２次研削加工を省略して面取加工のあと直ちに研磨仕上を行うことができれば、円盤状ワークの加工工程を大幅に短縮できる。   In order to improve the productivity of the disk-shaped workpiece and to provide the disk-shaped workpiece at a lower cost, there is a demand for shortening the machining process of the disk-shaped workpiece. For example, in the above processing, there is a demand for whether grinding can be performed in one step. If the secondary grinding process is omitted and the polishing finish can be performed immediately after the chamfering process, the machining process of the disk-shaped workpiece can be greatly shortened.

また、従来の面取加工用の総形砥石６は、金属ベース上にダイヤモンド砥粒を電着してなる砥石であり、砥石が摩耗したときには、砥石６自体の交換が必要であった。また、総形砥石であり、砥石軸６１とワーク軸１１が平行であるために、砥石とワークの接触線が長く、かつ円盤状の表裏の角を同時に加工するため、加工負荷も大きいという問題があった。   Further, the conventional grindstone 6 for chamfering is a grindstone formed by electrodepositing diamond abrasive grains on a metal base. When the grindstone is worn, it is necessary to replace the grindstone 6 itself. In addition, since this is a general-purpose grindstone, and the grindstone shaft 61 and the workpiece shaft 11 are parallel, the contact line between the grindstone and the workpiece is long, and the disk-shaped front and back corners are simultaneously machined. was there.

この発明は、これらの問題を解決するためになされたもので、面取面１６と情報の記録面となる表裏面１７との間の角１８に生ずるチッピングの発生を可及的に防止することにより、面取加工後の２次研削加工を省略できるようにすることを第一の課題としている。   The present invention has been made to solve these problems, and to prevent as much as possible the occurrence of chipping at the corner 18 between the chamfered surface 16 and the front and back surfaces 17 serving as information recording surfaces. Therefore, the first problem is to enable the secondary grinding after chamfering to be omitted.

また、加工負荷が小さく、かつ砥石が摩耗したときにも砥石の交換をすることなく、砥石と円盤状ワークとの相対位置の調整によって高精度の加工形状を維持できる円盤状ワークの面取装置を得ることを課題としている。   In addition, a chamfering device for a disk-shaped workpiece that can maintain a highly accurate machining shape by adjusting the relative position of the grinding wheel and the disk-shaped workpiece without changing the grinding wheel even when the processing load is small and the wheel is worn. The challenge is to obtain.

この出願の発明に係る円盤状ワークの面取装置は、軸心を鉛直方向にして設けられた回転ワーク軸１１と、当該ワーク軸１１の上端に設けられて加工しようとする円盤状ワーク１を水平に保持するワークホルダ１２と、当該ワークホルダ１２で保持された円盤状ワーク１の外周角を摺擦するカップ状の面取砥石２と、この面取砥石を装着した砥石軸２１と、この砥石軸を回転駆動する砥石モータ２３とを備えている。   The disk-shaped workpiece chamfering apparatus according to the invention of this application includes a rotating workpiece shaft 11 provided with an axial center in a vertical direction, and a disk-shaped workpiece 1 provided at the upper end of the workpiece shaft 11 to be machined. A work holder 12 held horizontally, a cup-shaped chamfering grindstone 2 for rubbing the outer peripheral angle of the disc-shaped work 1 held by the work holder 12, a grindstone shaft 21 equipped with the chamfering grindstone, And a grindstone motor 23 that rotationally drives the grindstone shaft.

面取砥石軸２１は、これに装着した面取砥石２の周縁が円盤状ワーク１の外周角の一箇所で接触するように、ワーク軸１１の軸心と斜めに立体交差する方向で設けられている。例えば、面取砥石軸２１は、ワーク軸１１の軸心を含む面ｐから一方の側に偏倚させかつ当該面と平行な面ｓ内で軸心を斜めにして設けられている。   The chamfering grindstone shaft 21 is provided in a direction obliquely intersecting with the axis of the work shaft 11 so that the peripheral edge of the chamfering grindstone 2 mounted on the chamfering grindstone 2 is in contact with the outer peripheral angle of the disc-shaped work 1. ing. For example, the chamfering grindstone shaft 21 is provided so as to be biased to one side from the surface p including the axis of the work shaft 11 and to be inclined in the plane s parallel to the surface.

砥石モータ２３は、面取砥石２と円盤状ワーク１との接触箇所における面取砥石２の摺擦方向ｄが円盤状ワーク１の内側から外側へと向かう方向、すなわち面取砥石２の外周が円盤状ワーク１の面取面１６を表裏面１７側から外周面１５側へと移動する方向となるように、面取砥石２を回転駆動する。   The grindstone motor 23 has a direction in which the rubbing direction d of the chamfering grindstone 2 at the contact point between the chamfering grindstone 2 and the disc-shaped workpiece 1 is directed from the inside to the outside of the disc-shaped workpiece 1, that is, the outer periphery of the chamfering grindstone 2. The chamfering grindstone 2 is rotationally driven so that the chamfered surface 16 of the disc-shaped workpiece 1 moves in the direction from the front and back surface 17 side to the outer peripheral surface 15 side.

面取砥石２は、円盤状ワーク１の上面側の外周角を摺擦する上面取砥石２ａと、下面側の外周角を摺擦する下面取砥石２ｂとを一対にして設けるのが好ましい。上下の面取砥石２ａ、２ｂは、円盤状ワークを挟んでその直径方向の両側に配置するか、両者を近接させて片側に配置する。前者の配置によれば、一対の面取砥石２ａ、２ｂの加工反力をバランスさせることができる。   The chamfering grindstone 2 is preferably provided with a pair of a top chamfering grindstone 2a that rubs the outer peripheral angle on the upper surface side of the disc-shaped workpiece 1 and a bottom chamfering grindstone 2b that rubs the outer peripheral angle on the lower surface side. The upper and lower chamfering grindstones 2a and 2b are arranged on both sides in the diametrical direction with a disc-shaped workpiece sandwiched therebetween, or are arranged on one side with the two being close to each other. According to the former arrangement, the processing reaction forces of the pair of chamfering grindstones 2a and 2b can be balanced.

上下一対の面取砥石２ａ、２ｂを設けたときは、円盤状ワーク１の外周面１５を研削する外周砥石５を設けることで、円盤状ワーク１の外周面１５と面取面１６の加工とを同時に又は連続して行うことができる。外周砥石５は、一対の面取砥石２ａ、２ｂが円盤状ワーク１を摺擦する位置ａ、ｂを結んだ線の中点と直交する線上に軸心を一致させて設けるのが好ましい。   When the upper and lower pair of chamfering grindstones 2a and 2b are provided, by providing the outer grindstone 5 for grinding the outer circumferential surface 15 of the disc-shaped workpiece 1, the processing of the outer circumferential surface 15 and the chamfered surface 16 of the disc-shaped workpiece 1 can be performed. Can be performed simultaneously or sequentially. The outer peripheral grindstone 5 is preferably provided with its axis aligned on a line perpendicular to the midpoint of the line connecting the positions a and b where the pair of chamfering grindstones 2a and 2b rub the disc-like workpiece 1.

一対の面取砥石２ａ、２ｂを円盤状ワーク１の片側に近接させて設けたときは、外周砥石５の配置位置は、円盤状ワーク１を挟んで面取砥石２ａ、２ｂと対向する位置とする。これにより、面取砥石２の加工反力と外周砥石５の加工反力をバランスさせることができる。   When the pair of chamfering grindstones 2a and 2b are provided close to one side of the disc-shaped workpiece 1, the position of the outer peripheral grindstone 5 is the position facing the chamfering grindstones 2a and 2b with the disc-shaped workpiece 1 sandwiched therebetween. To do. Thereby, the processing reaction force of the chamfering grindstone 2 and the processing reaction force of the outer peripheral grindstone 5 can be balanced.

この発明の面取装置では、砥石２が円盤状ワーク１の面取面１６を、情報の記録面となる表裏面１７から外周面１５に向う方向に摺擦して、外周角の面取を行う。これにより、砥石２の摺擦方向ｄの上流側となる面取面１６と表裏面１７との間の角１８に生ずるチッピングの発生が減少し、砥石が離れて行く方向となる面取面１６と外周面１５との間の角１９におけるチッピングの発生が増大する。外周面側の角１９のチッピングは、大きな問題にはならないので、表裏面側の角１８のチッピングが減少することによって、２次研削加工を省略することができることによる利益が大きい。   In the chamfering apparatus of the present invention, the grindstone 2 rubs the chamfered surface 16 of the disk-shaped workpiece 1 in the direction from the front and back surfaces 17 serving as the information recording surface toward the outer peripheral surface 15 to chamfer the outer peripheral angle. Do. As a result, the occurrence of chipping at the corner 18 between the chamfering surface 16 on the upstream side in the rubbing direction d of the grindstone 2 and the front and back surfaces 17 is reduced, and the chamfering surface 16 in the direction in which the grindstone moves away. And the occurrence of chipping at the corner 19 between the outer peripheral surface 15 increases. The chipping of the corner 19 on the outer peripheral surface side is not a big problem, so that the advantage of being able to omit the secondary grinding is great by reducing the chipping of the corner 18 on the front and back surfaces side.

また、面取砥石２が円盤状ワーク１の外周角の一箇所のみを摺擦しており、かつその摺擦方向が摺擦長さの短い面取面の幅方向であるため、砥石２に作用する負荷が小さい。更に砥石２が摩耗したときは、その摩耗量に応じてワーク軸１１と砥石軸２１との位置関係を調整することにより、すなわち砥石が摩耗した分だけ砥石軸２１をワーク軸１１に近付ける方向に送るか、又は摩耗した分だけ砥石軸２１を軸方向にワークに向けて進出させることにより、砥石を交換することなく、高精度の面取加工を行うことができる。   Further, since the chamfering grindstone 2 rubs only at one location on the outer peripheral angle of the disk-shaped workpiece 1 and the rubbing direction is the width direction of the chamfering surface having a short rubbing length, The acting load is small. Further, when the grindstone 2 is worn, the positional relationship between the work shaft 11 and the grindstone shaft 21 is adjusted according to the amount of wear, that is, the grindstone shaft 21 is moved closer to the work shaft 11 by the amount worn by the grindstone. By feeding or advancing the grindstone shaft 21 toward the workpiece in the axial direction by the amount worn, high-precision chamfering can be performed without exchanging the grindstone.

第１実施例の要部を側方から見た斜視図The perspective view which looked at the principal part of 1st Example from the side 第１実施例の要部の平面図The top view of the principal part of 1st Example カップ状砥石の模式的な断面図Schematic cross-sectional view of a cup-shaped grindstone 面取加工された円盤状ワークの外周部の部分平面図Partial plan view of the outer periphery of a chamfered disc-shaped workpiece 同部分断面図Partial sectional view of the same 第２実施例の要部を示す平面図The top view which shows the principal part of 2nd Example 同側面図Side view 従来の面取加工装置の要部を示す側面図Side view showing the main parts of a conventional chamfering device 従来装置により面取加工された円盤状ワークの外周部の部分拡大平面Partially enlarged plane of the outer periphery of a disk-shaped workpiece chamfered by a conventional device

以下、図面を参照して、この発明の実施例を説明する。図１ないし図４は、上下一対の面取砥石２（２ａ、２ｂ）を加工対象となる円盤状ワーク１の直径方向の両端の位置に配置した第１実施例を示した図である。５は円盤状ワーク１の外周面１５を研削加工する外周砥石である。   Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing a first embodiment in which a pair of upper and lower chamfering grindstones 2 (2a, 2b) are arranged at both ends in the diameter direction of a disk-like workpiece 1 to be machined. Reference numeral 5 denotes an outer peripheral grindstone for grinding the outer peripheral surface 15 of the disk-shaped workpiece 1.

円盤状ワーク１は、鉛直方向のワーク軸１１の上端のワークホルダ１２に保持されている。ワーク軸１１は、図示しない主軸モータで、比較的遅い速度（２〜２００ｒｐｍ）で回転駆動される。上下のカップ状砥石２ａ、２ｂは、それぞれ砥石軸２１ａ、２１ｂの先端に装着され、砥石モータ２３ａ、２３ｂにより、図の矢印Ｒａ、Ｒｂ方向に比較的高速（５０００〜１５０００ｒｐｍ）で回転駆動される。   The disk-shaped workpiece 1 is held by a workpiece holder 12 at the upper end of a workpiece shaft 11 in the vertical direction. The work shaft 11 is a spindle motor (not shown) and is driven to rotate at a relatively slow speed (2 to 200 rpm). The upper and lower cup-shaped grindstones 2a and 2b are mounted at the tips of the grindstone shafts 21a and 21b, respectively, and are driven to rotate at relatively high speeds (5000 to 15000 rpm) in the directions indicated by the arrows Ra and Rb by the grindstone motors 23a and 23b. .

上下の砥石モータ２３ａ、２３ｂは、図示しない上下の砥石台にそれぞれ搭載されており、これらの砥石台は、ＮＣ制御される図示しない送りモータ及び送りねじにより、砥石軸２１ａ、２１ｂと平行に進退する。砥石台を進出させると、カップ状砥石２のカップの周縁２５が円盤状ワーク１の外周角に接触し、当該外周角の面取加工が行われる。面取寸法は、ＮＣ装置に設定した砥石台の進出終了位置により決定される。   The upper and lower grinding wheel motors 23a and 23b are respectively mounted on upper and lower grinding wheel bases (not shown). These grinding wheel bases are advanced and retracted in parallel with the grinding wheel shafts 21a and 21b by a feed motor and feed screw (not shown) controlled by NC. To do. When the grindstone is advanced, the peripheral edge 25 of the cup of the cup-shaped grindstone 2 comes into contact with the outer peripheral angle of the disc-shaped workpiece 1 and the chamfering of the outer peripheral angle is performed. The chamfer dimension is determined by the advance end position of the grindstone table set in the NC device.

砥石軸２１ａ、２１ｂの軸心は、同一の鉛直面ｓ上に配置されており、この砥石軸配置面ｓは、ワーク軸１１の軸心を含む面ｐと平行で、かつ距離ｅだけ偏倚している。砥石軸２１ａ、２１ｂは、砥石軸配置面ｓ上で４５度傾斜した角度で配置されている。その結果、図３に示すカップ状砥石２の周縁２５は、図２の平面視で円盤状ワーク１の外周とカップ状砥石２ａ、２ｂの周縁２５の楕円弧とが交差する２点の内のワーク軸配置面ｐに近い側の点である一箇所ａ、ｂで円盤状ワーク１の外周角に接触する。   The axes of the grindstone shafts 21a and 21b are arranged on the same vertical plane s, and this grindstone shaft arrangement plane s is parallel to the plane p including the axis of the work shaft 11 and is offset by a distance e. ing. The grindstone shafts 21a and 21b are arranged at an angle of 45 degrees on the grindstone shaft arrangement surface s. As a result, the peripheral edge 25 of the cup-shaped grindstone 2 shown in FIG. 3 is a work at two points where the outer periphery of the disc-shaped work 1 and the elliptical arc of the peripheral edge 25 of the cup-shaped grindstones 2a and 2b intersect in the plan view of FIG. The outer peripheral angle of the disk-shaped workpiece 1 is brought into contact at one point a, b which is a point on the side close to the shaft arrangement surface p.

そして、カップ状砥石２ａ、２ｂの回転方向が図１に矢印Ｒａ、Ｒｂで示す方向であることから、この接触箇所ａ、ｂにおいて、カップ状砥石の周縁２５は、図４の矢印ｄで示すように、円盤状ワーク１の内側から外側に向けて円盤状ワーク１の外周角を摺擦する。すなわち、円盤状ワーク１の面取面１６は、図４、５に示すように、ワークの表裏面１７側から外周面１５側へと弧状に走行する砥石周縁２５によって研削される。   And since the rotation direction of the cup-shaped grindstones 2a and 2b is the direction indicated by arrows Ra and Rb in FIG. 1, the peripheral edge 25 of the cup-shaped grindstone is indicated by the arrow d in FIG. In this way, the outer peripheral angle of the disc-like workpiece 1 is rubbed from the inside to the outside of the disc-like workpiece 1. That is, as shown in FIGS. 4 and 5, the chamfered surface 16 of the disk-shaped workpiece 1 is ground by the grindstone peripheral edge 25 that travels in an arc shape from the front and back surfaces 17 side of the workpiece to the outer peripheral surface 15 side.

図３に例示したカップ状砥石２は、その周縁部分の内側と外側とが粒度の異なる砥石２５ｉと２５ｅで形成されたいわゆるマルチ砥石で、砥石軸２１の傾斜角を変えることにより、粗研削と仕上げ研削とが行われるものである。   The cup-shaped grindstone 2 illustrated in FIG. 3 is a so-called multi grindstone formed by grindstones 25i and 25e having different particle sizes on the inner and outer sides of the peripheral portion thereof. By changing the inclination angle of the grindstone shaft 21, rough grinding is performed. Finish grinding is performed.

外周砥石５は、周面が円筒形の砥石で、ワーク軸１１に平行に設けた外周砥石軸５１に装着されている。外周砥石軸５１は、ワーク軸１１に対して接近離隔する図示しない砥石台に軸支されており、回転しながら円盤状ワーク１に接触することによって、円盤状ワーク１の外周面１５を研削加工する。この外周面の研削加工は、従来装置と異なる所はない。   The outer peripheral grindstone 5 is a grindstone having a cylindrical peripheral surface, and is attached to an outer peripheral grindstone shaft 51 provided in parallel to the workpiece shaft 11. The outer peripheral grindstone shaft 51 is pivotally supported by a grindstone table (not shown) that approaches and separates from the work shaft 11 and contacts the disk-shaped work 1 while rotating to grind the outer peripheral surface 15 of the disk-shaped work 1. To do. This grinding of the outer peripheral surface is not different from the conventional apparatus.

図６及び７は、上下一対の面取砥石２ａ、２ｂを円盤状ワーク１の片側に近接させて配置した第２実施例を示した図で、第１実施例で説明した部材と同一の部材には同一の符号が付してある。面取砥石２ａ、２ｂは、第１実施例と同様に砥石モータ２３ａ、２３ｂで回転駆動（５０００〜１５０００ｒｐｍ）される砥石軸２１ａ、２１ｂに装着されている。   6 and 7 are views showing a second embodiment in which a pair of upper and lower chamfering grindstones 2a and 2b are arranged close to one side of the disk-like workpiece 1, and are the same members as those explained in the first embodiment. Are given the same reference numerals. The chamfering grindstones 2a and 2b are mounted on grindstone shafts 21a and 21b that are rotationally driven (5,000 to 15000 rpm) by the grindstone motors 23a and 23b, as in the first embodiment.

砥石軸２１ａ、２１ｂの軸心は、ワーク軸１１の軸心を含む面ｐと平行でかつ距離ｅだけ偏倚したそれぞれの砥石軸配置面ｓａ、ｓｂに４５度傾斜した角度で配置されている。その結果、上下の面取砥石２ａ、２ｂの周縁は、図６の平面視で円盤状ワーク１の外周とカップ状砥石２ａ、２ｂの周縁２５の楕円弧とが交差する点ａ、ｂで円盤状ワーク１の外周角に接触する。   The shaft centers of the grindstone shafts 21a and 21b are arranged at an angle of 45 degrees with respect to the respective grindstone shaft arrangement surfaces sa and sb that are parallel to the surface p including the axis of the workpiece shaft 11 and are offset by the distance e. As a result, the peripheral edges of the upper and lower chamfering grindstones 2a and 2b are disk-shaped at points a and b where the outer periphery of the disc-shaped workpiece 1 and the elliptical arc of the peripheral edge 25 of the cup-shaped grindstones 2a and 2b intersect in the plan view of FIG. It contacts the outer peripheral angle of the workpiece 1.

上下の面取砥石の砥石軸２１ａ、２１ｂは、同一の送り台２６にそれぞれの砥石軸の軸方向に進退自在に装着した砥石台２４ａ、２４ｂに軸支されている。一般的には、砥石モータ３３としてビルトイン型のモータを用い、当該モータの回転子軸を砥石軸とする。この場合は、砥石モータ２３ａ、２３ｂを砥石台２４ａ、２４ｂに固定することにより、砥石軸２１ａ、２１ｂが砥石台２４ａ、２４ｂに軸支される。   The grindstone shafts 21a and 21b of the upper and lower chamfering grindstones are pivotally supported by grindstone platforms 24a and 24b mounted on the same feed base 26 so as to be able to advance and retreat in the axial direction of the respective grindstone shafts. Generally, a built-in type motor is used as the grindstone motor 33, and the rotor shaft of the motor is a grindstone shaft. In this case, the grindstone shafts 21a and 21b are pivotally supported by the grindstone platforms 24a and 24b by fixing the grindstone motors 23a and 23b to the grindstone platforms 24a and 24b.

送り台２６をワーク軸１１に向けて進出させることにより、面取砥石２ａ、２ｂの周縁２５が円盤状ワーク１の上下の外周角に同時に接触する。砥石モータ２３ａ、２３ｂが面取砥石２ａ、２ｂを図の矢印Ｒａ、Ｒｂで示す方向に回転駆動している関係上、第１実施例と同様に、上下の面取砥石２ａ、２ｂは、円盤状ワーク１の上下の外周角を内側から外側へと摺擦して、当該外周角の面取加工を行う。   By moving the feed base 26 toward the workpiece shaft 11, the peripheral edges 25 of the chamfering grindstones 2 a and 2 b simultaneously contact the upper and lower outer peripheral angles of the disk-shaped workpiece 1. The upper and lower chamfering stones 2a and 2b are discs as in the first embodiment because the grindstone motors 23a and 23b rotate and drive the chamfering grindstones 2a and 2b in the directions indicated by the arrows Ra and Rb. The upper and lower outer peripheral angles of the workpiece 1 are rubbed from the inner side to the outer side to chamfer the outer peripheral angle.

上下の面取面１６の寸法は、送り台２６の進出位置（ワーク軸１１側への移動終了位置）によって設定される。面取砥石が摩耗したときの補正は、上下の砥石２ａ、２ｂの摩耗量が等しければ、送り台２６の進出位置の補正により補正できるが、上下の砥石２ａ、２ｂりの摩耗量が異なるときは、それぞれの砥石を軸支している砥石台２４ａ、２４ｂの砥石軸方向の進出位置を補正することにより補正する。   The dimensions of the upper and lower chamfered surfaces 16 are set by the advance position of the feed base 26 (movement end position toward the work shaft 11). The correction when the chamfering wheel is worn can be corrected by correcting the advance position of the feed base 26 if the wear amount of the upper and lower grindstones 2a and 2b is equal, but when the wear amount of the upper and lower grindstones 2a and 2b is different. Is corrected by correcting the advancing position in the wheel axis direction of the wheel heads 24a and 24b supporting the respective wheels.

以上説明したように、この発明の面取装置は、面取砥石２の周縁２５がワーク軸１１に保持された円盤状ワーク１の外周角に一箇所で接触し、当該接触箇所における面取砥石の摺擦方向が円盤状ワーク１の内側から外側に向う方向となるように、砥石軸２１の位置及び砥石モータ２３の回転方向が設定されている。   As described above, in the chamfering device of the present invention, the peripheral edge 25 of the chamfering grindstone 2 contacts the outer peripheral angle of the disc-shaped workpiece 1 held by the workpiece shaft 11 at one location, and the chamfering grindstone at the contact location is provided. The position of the grindstone shaft 21 and the direction of rotation of the grindstone motor 23 are set so that the rubbing direction of the disc becomes a direction from the inside to the outside of the disc-shaped workpiece 1.

このように、円盤状ワークの外周角を砥石で内側から外側へと摺擦して面取を行うと、加工された面取面１６と情報の記録面となる円盤状ワークの表裏面１７との間の角１８におけるチッピングの発生を防止することができ、従来行われていた表裏面１７の２次研削加工を省略して、表裏面の１次研削加工、外周加工及び面取加工並びに仕上研磨の３工程で円盤状ワークの研削・研磨を行うことができ、加工工程の大幅な短縮が可能になる。   Thus, when chamfering is performed by rubbing the outer peripheral angle of the disk-shaped workpiece from the inside to the outside with a grindstone, the processed chamfered surface 16 and the front and back surfaces 17 of the disk-shaped workpiece serving as an information recording surface Chipping at the corner 18 between the front and back surfaces can be prevented, and the conventional secondary grinding of the front and back surfaces 17 can be omitted, and the primary grinding, outer periphery and chamfering and finishing of the front and back surfaces can be omitted. The disk-like workpiece can be ground and polished in the three polishing steps, and the machining process can be greatly shortened.

１ 円盤状ワーク
２ａ、２ｂ カップ状の面取砥石
１１ ワーク軸
１２ ワークホルダ
１６ 面取面
１７ 表裏面
１８ 角
２１ 砥石軸
２３ 砥石モータ
ａ、ｂ ワークと面取砥石の接触箇所
ｄ 面取砥石の摺擦方向
ｐ ワーク軸の軸心を含む面
Ｒａ、Ｒｂ 面取砥石の回転方向
ｓ 砥石軸の配置面 DESCRIPTION OF SYMBOLS 1 Disc shaped workpiece 2a, 2b Cup-shaped chamfering grindstone 11 Work shaft 12 Work holder 16 Chamfering surface 17 Front and back surface 18 Angle 21 Grinding wheel shaft 23 Grinding wheel motor a, b Contact part of workpiece and chamfering grindstone d Sliding direction p Surface including axis of workpiece axis Ra, Rb Rotating direction of chamfering grindstone s Arrangement surface of grindstone shaft

Claims (4)

軸心を鉛直方向にして設けられた回転ワーク軸と、当該ワーク軸の上端に設けられて円盤状ワークを水平に保持するワークホルダと、当該ワークホルダで保持された円盤状ワークの外周角を摺擦する面取砥石と、当該面取砥石の砥石軸を回転駆動する砥石モータとを備えた円盤状ワークの面取装置において、
前記砥石軸が、これに装着したカップ状の面取砥石の周縁が前記円盤状ワークの外周角の一箇所に接触するように前記ワーク軸の軸心と立体交差する方向で設けられ、
前記砥石モータが、面取砥石の周縁と円盤状ワークとの接触箇所における面取砥石の摺擦方向が円盤状ワークの内側から外側へと向かう方向となる回転方向に、面取砥石を回転駆動することを特徴とする、
円盤状ワークの面取装置。 A rotating work shaft provided with the shaft center in the vertical direction, a work holder provided at the upper end of the work shaft to hold the disc-shaped work horizontally, and an outer peripheral angle of the disk-shaped work held by the work holder. In a chamfering device for a disk-shaped workpiece, comprising a chamfering grindstone for rubbing and a grindstone motor for rotationally driving a grindstone shaft of the chamfering grindstone,
The grindstone shaft is provided in a direction that three-dimensionally intersects with the axis of the workpiece shaft so that the peripheral edge of the cup-shaped chamfering grindstone mounted on the grindstone shaft contacts one location of the outer peripheral angle of the disc-shaped workpiece,
The grinding wheel motor drives the chamfering grindstone in a rotational direction in which the rubbing direction of the chamfering grindstone at the contact point between the peripheral edge of the chamfering grindstone and the disc-shaped workpiece is directed from the inside to the outside of the disc-shaped workpiece. It is characterized by
A chamfering device for disk-shaped workpieces. 前記面取砥石の砥石軸が、ワーク軸の軸心を含む面の一方の側に偏倚して、かつ当該面と平行な面内で、軸心をワーク軸に対して斜めにして設けられている、請求項１記載の円盤状ワークの面取装置。   The grindstone axis of the chamfering grindstone is biased to one side of the surface including the axis of the workpiece axis, and the axis is provided obliquely with respect to the workpiece axis in a plane parallel to the surface. The disc-shaped workpiece chamfering device according to claim 1. 円盤状ワークの上下の外周角をそれぞれ面取りする上下一対の面取砥石を備え、当該一対の面取砥石が、ワーク軸に保持された円盤状ワークの直径方向の両端の位置で当該ワークを摺擦するように配置されている、請求項１又は２記載の円盤状ワークの面取装置。   A pair of upper and lower chamfering wheels that chamfer the upper and lower outer peripheral angles of the disk-shaped workpiece are provided, and the pair of chamfering wheels slide the workpiece at positions at both ends in the diameter direction of the disk-shaped workpiece held on the workpiece shaft. The disk-shaped workpiece chamfering device according to claim 1 or 2, which is arranged to rub. 円盤状ワークの上下の外周角をそれぞれ面取りする上下一対の面取砥石を備え、当該一対の面取砥石が、ワーク軸に保持された円盤状ワークの直径方向の片側の近接した位置で当該ワークを摺擦するように配置され、当該ワークの外周面を研削する外周砥石が、一対の面取砥石と当該ワークを挟んで対向する位置に配置されている、請求項１又は２記載の円盤状ワークの面取装置。   A pair of upper and lower chamfering grindstones that chamfer the upper and lower outer peripheral angles of the disc-shaped workpiece, respectively, and the pair of chamfering grindstones are located close to each other on one side in the diameter direction of the disc-shaped workpiece held by the workpiece shaft. The disk-like shape according to claim 1 or 2, wherein an outer peripheral grindstone for grinding the outer peripheral surface of the workpiece is disposed at a position facing the pair of chamfering grindstones with the workpiece interposed therebetween. Work chamfering device.
JP2010251142A 2010-02-26 2010-11-09 Chamfering device for disk-like workpiece Pending JP2011194561A (en)

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