JPS6144748Y2 - - Google Patents

Description

【考案の詳細な説明】 (a) 考案の技術分野 本考案は角度割出し治具に係り、特に回転部
の面振れ精度を向上する改良された治具構造に
関する。[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to an angle indexing jig, and particularly to an improved jig structure that improves the surface runout accuracy of a rotating part.

(b) 技術の背景 角度割出し治具の精度といえば従来はその割
出し角度の精度のことを指していたが近年に至
り、該角度割出し治具の回転部の面振れの精度
を厳しく要求する場合が出てくるようになつて
きた。(b) Background of the technology The accuracy of an angle indexing jig used to refer to the accuracy of its indexing angle, but in recent years, the accuracy of the surface runout of the rotating part of the angle indexing jig has been strictly controlled. There are now cases where requests are made.

(c) 従来技術と問題点 専門メーカにより製作される角度割出し治具
の従来の面振れ精度は直径200mmにおいて20μ
程度までが限度であつた。ところが例えば第１
図に示すような内接円直径が80mmの正多角形体
１の各垂直面２と下面３との間の角度θの精度
が±2.0秒を要求されると上記の精度の割出し
治具では精度が不足し、従つてもう一桁高い面
振れ精度を有する割出し治具が待望されてい
た。(c) Conventional technology and problems The conventional surface runout accuracy of angle indexing jigs manufactured by specialized manufacturers is 20 μ at a diameter of 200 mm.
That was the limit. However, for example, the first
If the accuracy of the angle θ between each vertical surface 2 and the bottom surface 3 of a regular polygon 1 with an inscribed circle diameter of 80 mm as shown in the figure is required to be ±2.0 seconds, an indexing jig with the above accuracy will require an accuracy of ±2.0 seconds. Accuracy is lacking, and therefore, there has been a long-awaited indexing jig with an order of magnitude higher surface runout accuracy.

(d) 考案の目的 本考案は前述の点に鑑みなされたもので、出
来るだけ機構を簡単にして面振れ精度の高い角
度割出し治具を提供しようとするものである。(d) Purpose of the invention The present invention was devised in view of the above points, and aims to provide an angle indexing jig with high surface runout accuracy by simplifying the mechanism as much as possible.

(e) 考案の構成 上記の考案の目的は、固定基台４と該固定基
台４の高い平面度を有する上面５に設けられ、
同心円で大きさの異なる２つのガイドリング９
と前記上面５によつて構成された環状ガイド溝
１０と、前記環状ガイド溝１０にその全長に渡
り交互に配列した大小２種の鋼球と、前記固定
基台４上に所定の割出し位置に応じて回転自在
に設けられ、且つそれぞれ高い平面度および平
行度を有する、前記大径に鋼球１１に接する下
面７と逓前記工作物を載置する上面８とを備え
た回転部６と、前記割出し位置において前記回
転部６を前記固定基台４に対し固定する手段と
より構成されてなることを特徴とする角度割出
し治具を使用する事により容易に達成される。(e) Structure of the invention The purpose of the above invention is to provide a fixed base 4 and an upper surface 5 of the fixed base 4 with high flatness,
Two concentric guide rings 9 of different sizes
and an annular guide groove 10 constituted by the upper surface 5, two kinds of large and small steel balls arranged alternately in the annular guide groove 10 over its entire length, and a predetermined index position on the fixed base 4. a rotating part 6, which is rotatably provided according to the invention, and has a lower surface 7 in contact with the steel ball 11 on the large diameter and an upper surface 8 on which the workpiece is placed, each having high flatness and parallelism; This can be easily achieved by using an angle indexing jig characterized by comprising means for fixing the rotary part 6 to the fixed base 4 at the indexed position.

(f) 考案の実施例 以下本考案の実施例につき図面を参照して説
明する。第２図は本考案に基づく角度割出し治
具の一実施例の構成を概念的に示す断面図であ
る。(f) Embodiments of the invention Examples of the invention will be described below with reference to the drawings. FIG. 2 is a sectional view conceptually showing the structure of an embodiment of the angle indexing jig based on the present invention.

角度割出し治具の固定基台４の上面５および
回転部６の下面７と上面８の平面度を充分に仕
上げ、且つ上記平面７，８の相互間の平行度も
高精度に仕上げる。固定基台４と回転部６は軸
Ｘ−Ｘを共有して面５と面７とで接することに
なるが、両平面同志が直接潤滑油膜を介して接
する時は、該油膜の厚さが場所的、時間的に変
化して到底上記の精度が保証出来ない上、回転
トルクも大きいので作業上にも難点があり好ま
しくない。 The flatness of the upper surface 5 of the fixed base 4 of the angle indexing jig and the lower surface 7 and upper surface 8 of the rotating part 6 are sufficiently finished, and the parallelism between the planes 7 and 8 is also finished with high precision. The fixed base 4 and the rotating part 6 share the axis XX and are in contact with each other at surfaces 5 and 7. However, when the two planes directly contact each other through a lubricating oil film, the thickness of the oil film is The above accuracy cannot be guaranteed due to changes in location and time, and the rotational torque is also large, which is undesirable since it is difficult to operate.

面５，７の間にスラストベアリングを介在さ
せる場合は、回転部６の面振れ精度は上記スラ
ストベアリングのレースの面振れ精度に依存す
るが現在満足し得る精度を持つものは見当らな
い。 When a thrust bearing is interposed between the surfaces 5 and 7, the surface run-out accuracy of the rotating part 6 depends on the surface run-out accuracy of the race of the thrust bearing, but there is currently no one that has a satisfactory accuracy.

従つて第２図に示すように、固定基台４の上
面５に大きさの異なる２個のガイドリング９を
同心円状に設けることにより環状のガイド溝１
０を形成し、その中に大小２種の鋼球を交互に
配列して回転部６をその下面７で支える構造と
する。此の際、第３図の断面図で容易に判るよ
うに軸方向負荷は大鋼球１１が支え、小鋼球１
２は大鋼球１１のスペーサ、即ち、通常のスラ
ストボール軸受のリテーナーの役割を果たす。 Therefore, as shown in FIG. 2, by providing two guide rings 9 of different sizes concentrically on the upper surface 5 of the fixed base 4, an annular guide groove 1 can be formed.
0 is formed, and steel balls of two sizes, large and small, are arranged alternately therein, and the rotating part 6 is supported by the lower surface 7 thereof. In this case, as can be easily seen in the cross-sectional view of Fig. 3, the axial load is supported by the large steel ball 11, and the small steel ball 1
2 serves as a spacer for the large steel balls 11, that is, a retainer of a normal thrust ball bearing.

以上の説明より判るように回転部６の上面
８、即ち本考案の角度割出し治具の面振れ精度
は平面５，７，８の平面度および大鋼球１１の
機械的精度のみに依存し他の要素が介入しな
い。平面５，７，８および大鋼球１１の直径の
精度は充分に確保することができるから、現在
の機械加工技術の精度水準で上記の角度割出し
治具の面振れ精度に対する要求を満足させるこ
とが出来る。 As can be seen from the above explanation, the surface runout accuracy of the upper surface 8 of the rotating part 6, that is, the angle indexing jig of the present invention, depends only on the flatness of the flat surfaces 5, 7, and 8 and the mechanical accuracy of the large steel ball 11. No other factors intervene. Since the accuracy of the diameters of the flat surfaces 5, 7, 8 and the large steel ball 11 can be ensured sufficiently, the above-mentioned requirements for surface run-out accuracy of the angle indexing jig can be satisfied with the accuracy level of current machining technology. I can do it.

さて、第１図に示す正多角形体１を上記の角
度割出し治具に固定するには第２図に示すよう
に該正多角形体１の中央孔２ａを上記割出し治
具の回転部６の円筒部６ａに嵌合させて挿入
し、押え金具１３を被せてねじ１４で締定すれ
ばよい。 Now, in order to fix the regular polygonal body 1 shown in FIG. 1 to the above-mentioned angle indexing jig, as shown in FIG. It is only necessary to fit and insert it into the cylindrical portion 6a, cover it with the presser metal fitting 13, and tighten it with the screw 14.

尚、この場合、前記の角度割出し治具が専用
機であるので、図には示していないが、固定基
台４の上面５と回転部６とにそれぞれ対応して
等角度に設けられた複数組の小孔群の一組に嵌
合するピンを差し込んで割出し位置を出す方法
をとつており、十分な割出し角度の精度が得ら
れている。 In this case, since the above-mentioned angle indexing jig is a special-purpose machine, although it is not shown in the figure, it is provided at equal angles corresponding to the upper surface 5 of the fixed base 4 and the rotating part 6, respectively. The indexing position is determined by inserting a pin that fits into one of a plurality of small hole groups, and sufficient accuracy of the indexing angle is obtained.

例えば、第１図の正多角形１の側面２の回転
軸Ｘ−Ｘに対する傾き角度、所謂、面倒れ角度
は市販の精密級軸受を用いた場合の約10分の１
に減少することができた。 For example, the inclination angle of the side surface 2 of the regular polygon 1 in FIG.
was able to decrease to.

(g) 考案の効果 以上の説明から明らかなように、本考案によ
る角度割出し治具は高い面振れ精度を有するの
で、これを使用することにより例えば第１図に
示すような正多角形体の垂直端面の角度振れの
加工精度を所定値まで向上させ得るという効果
がある。(g) Effect of the invention As is clear from the above explanation, the angle indexing jig according to the invention has high surface run-out accuracy, so by using it, for example, regular polygons as shown in Fig. 1 can be formed. This has the effect of improving the machining accuracy of the angular runout of the vertical end face to a predetermined value.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案で使用する工作物の一例として
の正多角形体の斜視図、第２図は本考案による角
度割出し治具の構造を概念的に示す断面図、第３
図は第２図における鋼球の配列を示す断面図であ
る。 図において、１は正多角形体、２は垂直面、３
は下面、４は固定基台、６は回転部、９はガイド
リング、１０はガイド溝、１１，１２は鋼球、１
３は押え金具、１４はねじをそれぞれ示す。 Fig. 1 is a perspective view of a regular polygon as an example of a workpiece used in the present invention, Fig. 2 is a sectional view conceptually showing the structure of the angle indexing jig according to the present invention, and Fig. 3
The figure is a sectional view showing the arrangement of steel balls in FIG. 2. In the figure, 1 is a regular polygon, 2 is a vertical surface, and 3 is a regular polygon.
is the lower surface, 4 is a fixed base, 6 is a rotating part, 9 is a guide ring, 10 is a guide groove, 11 and 12 are steel balls, 1
3 indicates a presser metal fitting, and 14 indicates a screw.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 工作物の角度割出しに使用する治具であつて、
固定基台４と、該固定基台４の高い平面度を有す
る上面５に設けられ、同心円で大きさの異なる２
つのガイドリグ９と前記上面５によつて構成され
た環状ガイド溝１０と、該環状ガイド溝１０に全
長に渡り交互に配列した大小２種の鋼球１１，１
２と、前記固定基台４上に所定の割出し位置に応
じて回転自在に設けられ、且つそれぞれ高い平面
度および平行度を有する、前記大径の鋼球１１に
接する下面７と前記工作物を載置する上面８とを
備えた回転部６と、前記割出し位置において前記
回転部６を前記固定基台４に対し固定する手段１
３，１４とより構成されてなることを特徴とする
角度割出し治具。 A jig used for indexing the angle of a workpiece,
A fixed base 4 and two concentric circles of different sizes provided on the upper surface 5 of the fixed base 4 with high flatness.
An annular guide groove 10 constituted by two guide rigs 9 and the upper surface 5, and two types of large and small steel balls 11, 1 arranged alternately over the entire length in the annular guide groove 10.
2, a lower surface 7 in contact with the large-diameter steel ball 11, which is rotatably provided on the fixed base 4 according to a predetermined index position, and has high flatness and parallelism, respectively; and a lower surface 7 and the workpiece. a rotating part 6 having an upper surface 8 on which the rotating part 6 is placed; and means 1 for fixing the rotating part 6 to the fixed base 4 at the index position.
An angle indexing jig comprising: 3 and 14.