JP7074254B1 - How to finish the sliding surface of the master jaw - Google Patents

How to finish the sliding surface of the master jaw Download PDF

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JP7074254B1
JP7074254B1 JP2021182736A JP2021182736A JP7074254B1 JP 7074254 B1 JP7074254 B1 JP 7074254B1 JP 2021182736 A JP2021182736 A JP 2021182736A JP 2021182736 A JP2021182736 A JP 2021182736A JP 7074254 B1 JP7074254 B1 JP 7074254B1
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sliding surface
grindstone
master jaw
finishing
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祥弘 早川
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Howa Machinery Ltd
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Abstract

【課題】幅広部の摺動面を短時間で研削でき、且つ作業空間を省スペースで形成できるようにする。【解決手段】仕上げ加工前の複数のマスタジョー１０を、所定の回転中心Ｏとの同心円上で、且つ当該同心円の径方向外側で同一平面上に摺動面１４が位置するようにそれぞれ放射方向に配置し、各マスタジョー１０を回転中心Ｏを軸として同時に回転させながら、回転する砥石４を放射方向へ直線移動させて各摺動面１４を仕上げ加工する。【選択図】図２PROBLEM TO BE SOLVED: To grind a sliding surface of a wide portion in a short time and to form a work space in a small space. SOLUTION: A plurality of master jaws 10 before finishing are radiated in a radial direction so that a sliding surface 14 is located on a concentric circle with a predetermined rotation center O and on the same plane outside the radial direction of the concentric circle. While rotating each master jaw 10 at the same time with the rotation center O as an axis, the rotating grindstone 4 is linearly moved in the radial direction to finish each sliding surface 14. [Selection diagram] Fig. 2

Description

本開示は、工作機械に設けられ、ワークを把持するチャックに用いられるマスタジョーの摺動面を仕上げ加工する方法に関する。 The present disclosure relates to a method of finishing a sliding surface of a master jaw provided in a machine tool and used for a chuck for gripping a work.

ワークを回転させて加工を行うＮＣ旋盤等の工作機械には、ワークを保持するチャックが設けられている。このチャックは、ワークの把持爪として、正面視で径方向にスライドする複数のマスタジョーと、マスタジョーの前面にボルトで固定されるトップジョーとを備えている。マスタジョーは、チャック本体の前面へ径方向に形成された横断面Ｔ字状の取付溝に嵌合して、チャック本体に設けた駆動機構によって同期してスライドすることで、トップジョーによるワークのクランプ及びアンクランプを行う。
図５に示すように、マスタジョー１０は、取付溝から前方へ突出してトップジョーが固定される幅狭部１１と、取付溝内で抜け止めされる幅広部１２とを含む横断面Ｔ字状を有する金属製で、幅広部１２の長手方向の一端部に、プランジャ等を有する駆動機構に連結される連結部１３が略直角に連設されている。幅広部１２において、連結部１３を除く全域には、取付溝の内面に対して摺動する平坦な摺動面１４が形成されている。
この摺動面１４は、例えば特許文献１に開示されるように、高度な寸法精度及び平滑度を得るために、取付溝内での摺動方向と直交する幅方向に研削する仕上げ加工が施されている。 A machine tool such as an NC lathe that rotates a work to perform machining is provided with a chuck for holding the work. This chuck includes a plurality of master jaws that slide in the radial direction in the front view as gripping claws for the work, and a top jaw that is bolted to the front surface of the master jaw. The master jaw is fitted into a mounting groove having a T-shaped cross section formed in the radial direction on the front surface of the chuck body, and slides synchronously by the drive mechanism provided on the chuck body to allow the work by the top jaw. Clamp and unclamp.
As shown in FIG. 5, the master jaw 10 has a T-shaped cross section including a narrow portion 11 that protrudes forward from the mounting groove and the top jaw is fixed, and a wide portion 12 that is prevented from coming off in the mounting groove. At one end of the wide portion 12 in the longitudinal direction, a connecting portion 13 connected to a drive mechanism having a plunger or the like is continuously provided at a substantially right angle. In the wide portion 12, a flat sliding surface 14 that slides with respect to the inner surface of the mounting groove is formed in the entire area except the connecting portion 13.
As disclosed in Patent Document 1, for example, the sliding surface 14 is subjected to a finishing process of grinding in a width direction orthogonal to the sliding direction in the mounting groove in order to obtain high dimensional accuracy and smoothness. Has been done.

特許第６４１１６１９号公報Japanese Patent No. 6411619

上記従来の摺動面１４の仕上げ加工方法では、図６に示すように、複数のマスタジョー１０，１０・・を、各摺動面１４が同一面上に揃うように図示しないベース上へ直線状に並べ、このベースを、回転軸が横向きの砥石２０に対して矢印で示す方向へ直線移動させる。すると、相対移動する砥石２０によって各摺動面１４が摺動方向との直交方向に研削されることになる。
しかし、この場合、砥石２０の移動距離が大きくなって全体の研削時間が長くなる上、往復移動させると効率が悪くなる。また、作業空間も大きくなってしまう。 In the conventional finishing method of the sliding surface 14, as shown in FIG. 6, a plurality of master jaws 10, 10 ... Are straight lines on a base (not shown) so that the sliding surfaces 14 are aligned on the same surface. Arranged in a shape, the base is linearly moved in the direction indicated by the arrow with respect to the grindstone 20 whose axis of rotation is lateral. Then, each sliding surface 14 is ground in a direction orthogonal to the sliding direction by the grindstone 20 that moves relative to each other.
However, in this case, the moving distance of the grindstone 20 becomes large, the entire grinding time becomes long, and the efficiency deteriorates when the grindstone 20 is reciprocated. In addition, the work space becomes large.

そこで、本開示は、複数の幅広部の摺動面を短時間で研削でき、且つ作業空間を省スペースで形成できるマスタジョーの摺動面の仕上げ加工方法を提供することを目的としたものである。 Therefore, it is an object of the present disclosure to provide a method for finishing the sliding surface of a master jaw, which can grind a plurality of wide sliding surfaces in a short time and can form a work space in a small space. be.

上記目的を達成するために、本開示は、工作機械のチャックに用いられ、チャックに設けた取付溝の内面に沿って摺動するマスタジョーにおいて、前記内面との摺動面を仕上げ加工する方法であって、
仕上げ加工前の複数の前記マスタジョーを、所定の回転中心との同心円上で、且つ当該同心円の径方向外側で同一平面上に前記摺動面が位置するようにそれぞれ放射方向に配置し、
各前記マスタジョーを前記回転中心を軸として同時に回転させながら、回転する砥石を、前記放射方向で前記摺動面から離れる位置と前記摺動面上となる位置との間を、下端面の高さを変えながら前記放射方向に繰り返し直線移動させて各前記摺動面を仕上げ加工することを特徴とする。
本開示の別の態様は、上記構成において、前記砥石は、前記軸と平行な回転軸を中心に回転することを特徴とする。
本開示の別の態様は、上記構成において、前記砥石は、前記軸と直交する回転軸を中心に回転することを特徴とする。
In order to achieve the above object, the present disclosure is a method of finishing a sliding surface with the inner surface of a master jaw which is used for a chuck of a machine tool and slides along an inner surface of a mounting groove provided in the chuck. And
The plurality of master jaws before finishing are arranged in the radial direction on a concentric circle with a predetermined rotation center and on the same plane on the radial outside of the concentric circle.
While rotating each master jaw at the same time about the center of rotation , the height of the lower end surface of the rotating grindstone is set between a position away from the sliding surface in the radial direction and a position on the sliding surface. It is characterized in that each of the sliding surfaces is finished by repeatedly linearly moving in the radial direction while changing the size.
Another aspect of the present disclosure is characterized in that, in the above configuration, the grindstone rotates about a rotation axis parallel to the axis.
Another aspect of the present disclosure is characterized in that, in the above configuration, the grindstone rotates about a rotation axis orthogonal to the axis.

本開示によれば、砥石の移動距離が短くなり、全体の研削時間が短くて済む上、回転運動のため効率が良くなる。また、作業空間もコンパクトとなる。よって、複数の幅広部の摺動面を短時間で仕上げ加工でき、且つ作業空間を省スペースで形成可能となる。
本開示の別の態様によれば、上記効果に加えて、砥石を、軸と平行な回転軸を中心に回転させるので、砥石の広い端面を利用して効率よく研削可能となる。
本開示の別の態様によれば、上記効果に加えて、砥石を、軸と直交する回転軸を中心に回転させるので、砥石の周面と摺動面との位置合わせがしやすくなる。 According to the present disclosure, the moving distance of the grindstone is shortened, the entire grinding time can be shortened, and the efficiency is improved due to the rotational movement. In addition, the work space is also compact. Therefore, the sliding surfaces of a plurality of wide portions can be finished in a short time, and a work space can be formed in a small space.
According to another aspect of the present disclosure, in addition to the above effects, since the grindstone is rotated about a rotation axis parallel to the axis, it is possible to efficiently grind using the wide end face of the grindstone.
According to another aspect of the present disclosure, in addition to the above effect, since the grindstone is rotated about a rotation axis orthogonal to the axis, it becomes easy to align the peripheral surface of the grindstone with the sliding surface.

マスタジョーの斜視図である。It is a perspective view of a master jaw. 形態１のマスタジョーの摺動面の仕上げ加工方法を示す説明図である。It is explanatory drawing which shows the finishing process of the sliding surface of the master jaw of Embodiment 1. FIG. 形態２のマスタジョーの摺動面の仕上げ加工方法を示す説明図である。It is explanatory drawing which shows the finishing process of the sliding surface of the master jaw of the 2nd form. 変更例のマスタジョーの摺動面の仕上げ加工方法を示す説明図である。It is explanatory drawing which shows the finishing processing method of the sliding surface of the master jaw of the modification example. 従来のマスタジョーの斜視図である。It is a perspective view of a conventional master jaw. 従来のマスタジョーの摺動面の仕上げ加工方法を示す説明図である。It is explanatory drawing which shows the finishing processing method of the sliding surface of the conventional master jaw.

以下、本開示の実施の形態を図面に基づいて説明する。
［形態１］
図２は、マスタジョーの摺動面の仕上げ加工方法の一例を平面で示す説明図である。
この仕上げ加工方法では、ロータリー研削盤１が使用される。ロータリー研削盤１の旋回テーブル２上に、研削する複数（ここでは１２個）のマスタジョー１０，１０・・を、回転中心Ｏとの同心円上に等間隔で放射方向に配置する。
各マスタジョー１０は、図５に示したものと略同じで、トップジョーが固定される幅狭部１１と、チャック本体に設けた取付溝内で抜け止めされる幅広部１２とを含む横断面Ｔ字状の金属製で、幅広部１２の長手方向の一端部に、チャック本体に設けた駆動機構に連結される連結部１３が略直角に連設されている。幅広部１２における幅狭部１１と反対側の面に、取付溝との摺動面１４が形成されている。但し、摺動面１４にはグリス供給用の溝１５が形成されている。仕上げ加工前のマスタジョー１０は、鍛造若しくは汎用の丸材、角材から切削加工し、研削加工により形成される。
各マスタジョー１０は、幅広部１２の摺動面１４が上面となり、連結部１３が回転中心Ｏ側となる向きで旋回テーブル２上に配置されている。よって、各摺動面１４は、旋回テーブル２の径方向外側で略同一平面上に位置している。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[Form 1]
FIG. 2 is an explanatory view showing an example of a finishing method for a sliding surface of a master jaw in a plane.
In this finishing method, the rotary grinding machine 1 is used. On the swivel table 2 of the rotary grinding machine 1, a plurality of (12 in this case) master jaws 10, 10 ... To be ground are arranged in the radial direction on a concentric circle with the rotation center O at equal intervals.
Each master jaw 10 is substantially the same as that shown in FIG. 5, and has a cross section including a narrow portion 11 to which the top jaw is fixed and a wide portion 12 to be prevented from coming off in the mounting groove provided in the chuck body. It is made of T-shaped metal, and at one end of the wide portion 12 in the longitudinal direction, a connecting portion 13 connected to a drive mechanism provided on the chuck body is continuously provided at a substantially right angle. A sliding surface 14 with a mounting groove is formed on the surface of the wide portion 12 opposite to the narrow portion 11. However, a groove 15 for supplying grease is formed on the sliding surface 14. The master jaw 10 before finishing is formed by forging or cutting from general-purpose round lumber and square lumber and grinding.
Each master jaw 10 is arranged on the swivel table 2 with the sliding surface 14 of the wide portion 12 on the upper surface and the connecting portion 13 facing the rotation center O side. Therefore, each sliding surface 14 is located on substantially the same plane on the outer side in the radial direction of the swivel table 2.

このマスタジョー１０，１０・・の配置列の外側に、旋回テーブル２の回転中心Ｏを通る鉛直方向の軸Ｌと回転軸が平行となる円盤状の砥石４を有する駆動ユニット３を配置して、砥石４を図２（Ａ）の矢印Ａ方向に回転させる。これと同時に旋回テーブル２を矢印Ｂ方向に回転させる。
砥石４及び旋回テーブル２が規定の回転数に達すると、砥石４を、同図（Ａ）の位置から、位置αの摺動面１４に対して矢印Ｃ方向へ直線状に前進させる。すると、砥石４は、同図（Ｂ）～同図（Ｄ）の順で位置αの摺動面１４上に移動する。こうして砥石４を、下端面の高さを変えながら同図（Ａ）と同図（Ｄ）との間を繰り返し移動させることで、砥石４の下端面によって複数の摺動面１４を連続して研削する。よって、全ての摺動面１４が平滑な摺動面１４に仕上げ加工される。 A drive unit 3 having a disk-shaped grindstone 4 whose vertical axis L passing through the rotation center O of the swivel table 2 and the rotation axis are parallel to each other is arranged outside the arrangement row of the master jaws 10, 10 ... , The grindstone 4 is rotated in the direction of the arrow A in FIG. 2 (A). At the same time, the swivel table 2 is rotated in the direction of arrow B.
When the grindstone 4 and the swivel table 2 reach the specified rotation speed, the grindstone 4 is linearly advanced in the direction of arrow C with respect to the sliding surface 14 at the position α from the position shown in FIG. Then, the grindstone 4 moves on the sliding surface 14 at the position α in the order of the figure (B) to the figure (D). In this way, by repeatedly moving the grindstone 4 between the lower end surface of the figure (A) and the figure (D) while changing the height of the lower end surface, the plurality of sliding surfaces 14 are continuously made by the lower end surface of the grindstone 4. Grind. Therefore, all the sliding surfaces 14 are finished to be smooth sliding surfaces 14.

このように、上記形態１のマスタジョー１０の摺動面１４の仕上げ加工方法は、仕上げ加工前の複数のマスタジョー１０を、所定の回転中心Ｏとの同心円上で、且つ当該同心円の径方向外側で同一平面上に摺動面１４が位置するようにそれぞれ放射方向に配置し、各マスタジョー１０を回転中心Ｏを軸として同時に回転させながら、回転する砥石４を摺動面１４側へ放射方向に直線移動させて各摺動面１４を仕上げ加工する。
この構成によれば、砥石４の移動距離が短くなり、全体の研削時間が短くて済む上、砥石４及び旋回テーブル２が回転運動のため高効率加工が可能となる。また、作業空間もコンパクトとなる。よって、複数の幅広部１２の摺動面１４を短時間で仕上げ加工でき、且つ作業空間を省スペースで形成可能となる。
特に、砥石４を、軸Ｌと平行な回転軸を中心に回転させるので、砥石４の広い端面を利用して効率よく研削可能となる。 As described above, in the finishing method of the sliding surface 14 of the master jaw 10 of the first embodiment, the plurality of master jaws 10 before finishing machining are placed on a concentric circle with a predetermined rotation center O and in the radial direction of the concentric circle. The sliding surfaces 14 are arranged in the radial direction so that the sliding surfaces 14 are located on the same plane on the outside, and the rotating grindstone 4 is radiated to the sliding surface 14 side while simultaneously rotating each master jaw 10 with the rotation center O as an axis. Each sliding surface 14 is finished by moving it linearly in the direction.
According to this configuration, the moving distance of the grindstone 4 is shortened, the entire grinding time is short, and the grindstone 4 and the swivel table 2 are rotationally moved, so that high-efficiency machining is possible. In addition, the work space is also compact. Therefore, the sliding surfaces 14 of the plurality of wide portions 12 can be finished in a short time, and a work space can be formed in a small space.
In particular, since the grindstone 4 is rotated about a rotation axis parallel to the axis L, it is possible to efficiently grind using the wide end face of the grindstone 4.

［形態２］
次に、本開示の別の形態を説明する。但し、形態１と同じ構成部には同じ符号を付して重複する説明は省略する。
図３に示すように、この形態２では、駆動ユニット３における砥石４が、回転軸が軸Ｌと平行でなく、軸Ｌと直交する横向きとなっている点で形態１と異なっている。後は形態１と同じである。
ここでも旋回テーブル２を矢印Ｂ方向に回転させながら、砥石４を、周面の最下位置の高さを摺動面１４に合わせて矢印Ａ方向に回転させ、図３（Ａ）の位置から、位置αの摺動面１４に対して、二点鎖線で示すように、同図（Ｂ）（Ｃ）のように矢印Ｃ方向へ直線状に前進させる。そして、砥石４を、高さを変えながら同図（Ａ）と同図（Ｄ）との間を繰り返し移動させることで、砥石４の周面によって複数の摺動面１４を連続して研削する。よって、全ての摺動面１４が平滑な摺動面１４に仕上げ加工される。 [Form 2]
Next, another embodiment of the present disclosure will be described. However, the same components as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.
As shown in FIG. 3, this embodiment 2 differs from the first embodiment in that the grindstone 4 in the drive unit 3 is not parallel to the axis L but is oriented laterally orthogonal to the axis L. The rest is the same as Form 1.
Again, while rotating the swivel table 2 in the direction of arrow B, the grindstone 4 is rotated in the direction of arrow A so that the height of the lowest position of the peripheral surface is aligned with the sliding surface 14, from the position of FIG. 3 (A). As shown by the alternate long and short dash line, the sliding surface 14 at position α is linearly advanced in the direction of arrow C as shown in FIGS. (B) and (C). Then, by repeatedly moving the grindstone 4 between the figure (A) and the figure (D) while changing the height, the plurality of sliding surfaces 14 are continuously ground by the peripheral surface of the grindstone 4. .. Therefore, all the sliding surfaces 14 are finished to be smooth sliding surfaces 14.

このように、上記形態２のマスタジョーの摺動面１４の仕上げ加工方法も、各マスタジョー１０を回転中心Ｏを軸として同時に回転させながら、回転する砥石４を摺動面１４側へ放射方向に直線移動させて各摺動面１４を仕上げ加工するので、砥石４の移動距離が短くなり、全体の研削時間も短くて済む上、砥石４及び旋回テーブル２が回転運動のため高効率加工が可能となる。また、作業空間もコンパクトとなる。よって、複数の幅広部１２の摺動面１４を短時間で仕上げ加工でき、且つ作業空間を省スペースで形成可能となる。
特に、砥石４を、軸Ｌと直交する回転軸を中心に回転させるので、砥石４の周面と摺動面１４との位置合わせがしやすくなる。 As described above, also in the finishing method of the sliding surface 14 of the master jaw of the second embodiment, the rotating grindstone 4 is radiated toward the sliding surface 14 while rotating each master jaw 10 simultaneously with the rotation center O as an axis. Since each sliding surface 14 is finished by moving it linearly, the moving distance of the grindstone 4 is shortened, the total grinding time is short, and the grindstone 4 and the swivel table 2 are rotationally moved for high-efficiency machining. It will be possible. In addition, the work space is also compact. Therefore, the sliding surfaces 14 of the plurality of wide portions 12 can be finished in a short time, and a work space can be formed in a small space.
In particular, since the grindstone 4 is rotated about a rotation axis orthogonal to the axis L, it becomes easy to align the peripheral surface of the grindstone 4 with the sliding surface 14.

以下、変更例を説明する。
形態１，２に共通して、旋回テーブルの回転方向及び砥石の回転方向はそれぞれ逆であってもよい。特に形態１では、図４（Ａ）に示すように、各マスタジョー１０を、回転中心Ｏ側に摺動面１４がそれぞれ位置する向きとして同心円上に配置すると共に、マスタジョー１０の配列の内側に砥石４を配置してもよい。この場合も、砥石４を矢印Ａ方向に、旋回テーブル２を矢印Ｂ方向に回転させながら砥石４を矢印Ｃ方向へ同図（Ｂ）～（Ｄ）のように直線移動させる動きを繰り返せば、各摺動面１４を仕上げ加工することができる。
砥石の形状及び大きさは、上記形態１，２に限らない。複数の砥石をマスタジョーの配列に対してそれぞれ異なる放射方向から進退動させてもよい。
本開示の仕上げ加工方法を実施する機械は、ロータリー研削盤に限らない。マスタジョーを配列する数も適宜増減できる。
仕上げ加工するマスタジョーの形状は、上記形態に限らない。例えば摺動面の溝の形態が異なるものや、溝がない摺動面を有するものであっても本開示は適用可能である。 An example of the change will be described below.
Common to the first and second forms, the rotation direction of the swivel table and the rotation direction of the grindstone may be opposite to each other. In particular, in the first embodiment, as shown in FIG. 4A, the master jaws 10 are arranged on concentric circles in the direction in which the sliding surfaces 14 are located on the rotation center O side, and inside the arrangement of the master jaws 10. The grindstone 4 may be arranged at the center. In this case as well, if the grindstone 4 is rotated in the direction of arrow A and the swivel table 2 is rotated in the direction of arrow B and the grindstone 4 is linearly moved in the direction of arrow C as shown in FIGS. Each sliding surface 14 can be finished.
The shape and size of the grindstone are not limited to the above forms 1 and 2. A plurality of grindstones may be moved forward and backward from different radial directions with respect to the arrangement of the master jaws.
The machine that implements the finishing method of the present disclosure is not limited to the rotary grinding machine. The number of master jaws arranged can be increased or decreased as appropriate.
The shape of the master jaw to be finished is not limited to the above form. For example, the present disclosure is applicable even if the form of the groove on the sliding surface is different or the sliding surface has no groove.

１・・ロータリー研削盤、２・・旋回テーブル、３・・駆動ユニット、４・・砥石、１０・・マスタジョー、１１・・幅狭部、１２・・幅広部、１３・・連結部、１４・・摺動面、Ｏ・・回転中心、Ｌ・・軸。 1 ... rotary grinding machine, 2 ... swivel table, 3 ... drive unit, 4 ... grindstone, 10 ... master jaw, 11 ... narrow part, 12 ... wide part, 13 ... connecting part, 14・ ・ Sliding surface, O ・ ・ Center of rotation, L ・ ・ Axis.

Claims (3)

工作機械のチャックに用いられ、チャックに設けた取付溝の内面に沿って摺動するマスタジョーにおいて、前記内面との摺動面を仕上げ加工する方法であって、
仕上げ加工前の複数の前記マスタジョーを、所定の回転中心との同心円上で、且つ当該同心円の径方向外側で同一平面上に前記摺動面が位置するようにそれぞれ放射方向に配置し、
各前記マスタジョーを前記回転中心を軸として同時に回転させながら、回転する砥石を、前記放射方向で前記摺動面から離れる位置と前記摺動面上となる位置との間を、下端面の高さを変えながら前記放射方向に繰り返し直線移動させて各前記摺動面を仕上げ加工することを特徴とするマスタジョーの摺動面の仕上げ加工方法。 A method of finishing the sliding surface with the inner surface of a master jaw that is used for a chuck of a machine tool and slides along the inner surface of a mounting groove provided in the chuck.
The plurality of master jaws before finishing are arranged in the radial direction on a concentric circle with a predetermined rotation center and on the same plane on the radial outside of the concentric circle.
While rotating each master jaw at the same time about the center of rotation , the height of the lower end surface of the rotating grindstone is set between a position away from the sliding surface in the radial direction and a position on the sliding surface. A method for finishing a sliding surface of a master jaw, which comprises repeatedly linearly moving the sliding surface in the radial direction while changing the size of the sliding surface. 前記砥石は、前記軸と平行な回転軸を中心に回転することを特徴とする請求項１に記載のマスタジョーの摺動面の仕上げ加工方法。 The method for finishing a sliding surface of a master jaw according to claim 1, wherein the grindstone rotates about a rotation axis parallel to the axis. 前記砥石は、前記軸と直交する回転軸を中心に回転することを特徴とする請求項１に記載のマスタジョーの摺動面の仕上げ加工方法。 The method for finishing a sliding surface of a master jaw according to claim 1, wherein the grindstone rotates about a rotation axis orthogonal to the axis.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5621756A (en) * 1979-07-23 1981-02-28 Torasaburou Kobayashi Grinding method
JPS6094263A (en) * 1983-10-28 1985-05-27 Hitachi Metals Ltd Grinding method
JPS6179556A (en) * 1984-09-26 1986-04-23 Hitachi Metals Ltd Grinding method
JPH07246550A (en) * 1994-03-12 1995-09-26 Sumitomo Heavy Ind Ltd Double head surface grinder
JP2019098467A (en) * 2017-12-01 2019-06-24 株式会社北川鉄工所 Chuck and production method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5621756A (en) * 1979-07-23 1981-02-28 Torasaburou Kobayashi Grinding method
JPS6094263A (en) * 1983-10-28 1985-05-27 Hitachi Metals Ltd Grinding method
JPS6179556A (en) * 1984-09-26 1986-04-23 Hitachi Metals Ltd Grinding method
JPH07246550A (en) * 1994-03-12 1995-09-26 Sumitomo Heavy Ind Ltd Double head surface grinder
JP2019098467A (en) * 2017-12-01 2019-06-24 株式会社北川鉄工所 Chuck and production method thereof

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