JPS6346220Y2

JPS6346220Y2 -

Info

Publication number: JPS6346220Y2
Application number: JP1984005003U
Authority: JP
Priority date: 1984-01-18
Filing date: 1984-01-18
Publication date: 1988-12-01
Also published as: JPS60117046U

Description

【考案の詳細な説明】（産業上の利用分野）本考案は各種の孔の内周面を精度良く研削加工
することができる内面研削装置に関するものであ
る。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an internal grinding device that can grind the inner peripheral surfaces of various holes with high precision.

（従来の技術）内面研削装置は回転砥石を先端部に備えた単一
の回転軸を主軸台上に設け、被加工物を回転させ
ながら主軸台を被研削孔の長手方向に移動させつ
つ被研削孔の内周面を研削加工するものである
が、被研削孔に対する回転砥石の相対位置は専ら
回転軸の剛性によつて維持されているため回転砥
石が研削抵抗により研削面から逃げることを防止
することが困難であり、外面研削装置に比較して
高い寸法精度が得られない欠点があつた。(Prior art) An internal grinding device has a single rotating shaft equipped with a rotating grindstone at the tip on the headstock, and rotates the workpiece while moving the headstock in the longitudinal direction of the hole to be ground. The inner circumferential surface of the grinding hole is ground, but since the relative position of the grinding wheel to the hole to be ground is maintained solely by the rigidity of the rotating shaft, it is difficult for the grinding wheel to escape from the grinding surface due to grinding resistance. It is difficult to prevent this and has the disadvantage that higher dimensional accuracy cannot be obtained compared to external grinding equipment.

（考案が解決しようとする課題）本考案はこのような従来の欠点を解決して極め
て高い寸法精度を得ることができる内面研削装置
を目的として完成されたものである。(Problems to be Solved by the Invention) The present invention has been completed with the aim of providing an internal grinding device that can solve these conventional drawbacks and obtain extremely high dimensional accuracy.

（課題を解決するための手段）本考案は被研削孔の内周面にそれぞれ内接する
回転砥石を先端部に備えた回転軸の複数本を主軸
台に互いに平行に取付けるとともに、これらの回
転軸の中央部に挿入された支持棒の先端には各回
転軸の先端部付近と係合して各回転軸を相互に外
方へ押圧拡開する拡開部材を設けたことを特徴と
するものであり、以下、図示の実施例について詳
細に説明する。(Means for Solving the Problems) The present invention involves attaching a plurality of rotary shafts each having a rotary grindstone at the tip, which is inscribed in the inner circumferential surface of the hole to be ground, to the headstock parallel to each other, and An expansion member is provided at the tip of the support rod inserted into the center of the rotating shaft, which engages with the vicinity of the tip of each rotating shaft and presses and expands each rotating shaft mutually outward. The illustrated embodiment will be described in detail below.

（実施例）１は主軸台、２は該主軸台１上に互いに平行に
取付けられた複数本の回転軸であつて、各回転軸
２の基部はスピンドル部３を介して主軸台１に支
持されており、各回転軸２の先端部には回転砥石
４が固定されて各回転砥石４は第２図に示される
ように被加工物１０の被研削孔１１の内周面にそ
れぞれ内接するよう配置されている。そして、こ
れらの回転軸２の先端方部には各回転軸４を外方
へ押圧拡開する拡開部材５が設けられている。該
拡開部材５は複数の回転軸２の中央部に回転軸２
と平行に突出させた支持棒６の先端に設けられる
ものであり、支持棒６の管路７を介して供給され
る油圧により突出する複数本の腕８を備えてい
る。各腕８の先端は回転軸２の先端部付近と係合
しているので、管路７の油圧を適宜の圧力制御ユ
ニツトにより制御すれば各回転軸２は相互に外方
へ押圧拡開され、同時に各回転砥石４は所定の圧
力で被研削孔１１の内周面に押圧されることとな
る。なお、拡開部材５は油圧式に限定されるもの
ではなく、空気圧式、機械式、電磁力式等の種々
の機構を採ることもできるが、拡開部材５は被加
工物１０の被研削孔１１と直接接することはな
い。(Example) 1 is a headstock, 2 is a plurality of rotating shafts mounted on the headstock 1 in parallel with each other, and the base of each rotating shaft 2 is supported by the headstock 1 via a spindle part 3. A rotating grindstone 4 is fixed to the tip of each rotating shaft 2, and each rotating grindstone 4 is inscribed in the inner peripheral surface of the hole 11 to be ground in the workpiece 10, as shown in FIG. It is arranged like this. An expanding member 5 is provided at the distal end of each rotating shaft 2 to press and expand each rotating shaft 4 outward. The expansion member 5 has a plurality of rotation shafts 2 at the center thereof.
It is provided at the tip of a support rod 6 that protrudes parallel to , and is provided with a plurality of arms 8 that are protruded by hydraulic pressure supplied through a conduit 7 of the support rod 6 . Since the tip of each arm 8 is engaged with the vicinity of the tip of the rotating shaft 2, if the hydraulic pressure of the pipe line 7 is controlled by an appropriate pressure control unit, the rotating shafts 2 can be pushed outward and expanded relative to each other. At the same time, each rotating grindstone 4 is pressed against the inner peripheral surface of the hole to be ground 11 with a predetermined pressure. Note that the expanding member 5 is not limited to a hydraulic type, and various mechanisms such as a pneumatic type, a mechanical type, and an electromagnetic force type can be adopted, but the expanding member 5 can be used to It does not come into direct contact with the hole 11.

（作用）このように構成されたものは、被加工物１０を
常法によりセツトしたうえで主軸台１を被加工物
１０の方向へ移動させ、主軸台１に互いに平行に
取付けられた複数本の回転軸２を被研削孔１１の
内部へ挿入して各回転軸２の先端部に備えられた
回転砥石４を被研削孔１１の内周面に内接させる
とともに、これらの回転軸２の中央部に挿入され
た支持棒６の先端に設けられた拡開部材５の複数
本の腕８により各回転軸２を相互に外方へ押圧拡
開すれば、各回転砥石４は所定の圧力で被研削孔
１１の内周面に押圧されつつ能率良く内面研削を
行うこととなる。この間、各回転軸２は先端部付
近を拡開部材５の腕８により支持されているため
仮に回転軸２が細長く剛性が小さい場合にも回転
砥石４が研削抵抗により研削面から逃げることが
なく、極めて寸法精度の高い内面研削加工を行う
ことができる。なお、回転軸２及び回転砥石４の
数は２又は３とするのが好ましい。また各回転軸
２には作用・反作用の原理によつて均等な押圧力
を与えることができるので、被研削孔１１の内周
面を均一に内面研削することができる。(Function) In the device configured as described above, the workpiece 10 is set in a conventional manner, and then the headstock 1 is moved in the direction of the workpiece 10. The rotary shafts 2 of the rotary shafts 2 are inserted into the holes 11 to be ground, and the rotary grindstones 4 provided at the tips of the rotary shafts 2 are inscribed in the inner circumferential surface of the hole 11 to be ground. When the rotating shafts 2 are pressed outward and expanded by the plurality of arms 8 of the expanding member 5 provided at the tip of the support rod 6 inserted into the center, each rotating grindstone 4 is applied with a predetermined pressure. As a result, the inner surface of the hole 11 to be ground is pressed and the inner surface is efficiently ground. During this time, each rotating shaft 2 is supported near its tip by the arm 8 of the expanding member 5, so even if the rotating shaft 2 is long and thin and has low rigidity, the grinding wheel 4 will not escape from the grinding surface due to grinding resistance. , it is possible to perform internal grinding with extremely high dimensional accuracy. Note that the number of rotating shafts 2 and rotating grindstones 4 is preferably two or three. Further, since equal pressing force can be applied to each rotary shaft 2 based on the principle of action and reaction, the inner circumferential surface of the hole to be ground 11 can be internally ground uniformly.

（考案の効果）本考案は以上の説明からも明らかなように、孔
の内周面を極めて高い寸法精度で研削加工するこ
とができるものであり、従来の内面研削装置の欠
点を解決したものとして実用的価値は大なもので
ある。(Effects of the invention) As is clear from the above explanation, the present invention is capable of grinding the inner peripheral surface of a hole with extremely high dimensional accuracy, and solves the drawbacks of conventional internal grinding devices. As such, it has great practical value.

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

第１図は本考案の実施例を示す要部の一部切欠
正面図、第２図は同じく第１図のＡ−Ａ断面図で
ある。１……主軸台、２……回転軸、４……回転砥
石、５……拡開部材、６……支持棒、１１……被
研削孔。 FIG. 1 is a partially cutaway front view of a main part showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1. DESCRIPTION OF SYMBOLS 1... Headstock, 2... Rotating shaft, 4... Rotating grindstone, 5... Expanding member, 6... Support rod, 11... Hole to be ground.

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

被研削孔の内周面にそれぞれ内接する回転砥石
４を先端部に備えた回転軸２の複数本を主軸台１
に平行に取付けるとともに、これらの回転軸２の
中央部に挿入された支持棒６の先端には各回転軸
２の先端部付近と係合して各回転軸２を相互に外
方へ押圧拡開する拡開部材５を設けたことを特徴
とする内面研削装置。 A plurality of rotary shafts 2 each having a rotary grindstone 4 inscribed in the inner peripheral surface of the hole to be ground at the tip thereof are mounted on a headstock 1.
At the same time, the tip of a support rod 6 inserted into the center of these rotating shafts 2 engages with the vicinity of the tip of each rotating shaft 2 to press and expand each rotating shaft 2 outward from each other. An internal grinding device characterized by being provided with an expanding member 5 that opens.