JPH0525765Y2

JPH0525765Y2 -

Info

Publication number: JPH0525765Y2
Application number: JP17793784U
Authority: JP
Priority date: 1984-11-22
Filing date: 1984-11-22
Publication date: 1993-06-29
Anticipated expiration: 1999-11-22
Also published as: JPS6196602U

Description

【考案の詳細な説明】〔産業上の利用分野〕本考案は、工作機械の心押センタ構造に関する
ものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tailstock center structure for a machine tool.

[Conventional technology]

従来この種の心押センタは円筒研削盤、旋盤等
に用いられ、その先端部は円錐状に形成され、加
工物の円錐状のセンタ穴にその先端部を嵌入さ
れ、加工物の一方端面を回転自在に支持するよう
に構成されている。 Conventionally, this type of tailstock center has been used in cylindrical grinders, lathes, etc., and its tip is formed into a conical shape, and the tip is inserted into the conical center hole of the workpiece, so that one end surface of the workpiece is It is configured to be rotatably supported.

[The problem that the idea attempts to solve]

しかしながら、その心押センタの円錐状の先端
部と加工物の円錐状のセンタ穴とは接触状態のた
め、その接触摩擦によつて加工物の回転に影響を
及ぼし、超精密加工に当たつては切削面、研削面
に弊害を生じさせる要因となる不都合な面を有し
ている。 However, since the conical tip of the tailstock center and the conical center hole of the workpiece are in contact, the contact friction affects the rotation of the workpiece, making it difficult to perform ultra-precision machining. has an inconvenient surface that causes harmful effects on the cutting surface and the grinding surface.

[Means to solve the problem]

本考案はこれらの不都合を解消することを目的
とするもので、その要旨は、加工物端面の円錐状
のセンタ穴に嵌入される心押センタであつて、該
心押センタの先端部に円錐状の多孔質セラミツク
製の軸受部材を設け、心押センタの内部に供給穴
を形成し、該供給孔を介して軸受部材内部に圧縮
空気又は圧油を供給し、該圧縮空気又は圧油を軸
受部材の外表面から噴出せしめる圧縮空気又は圧
油の供給部を設けたことを特徴とする工作機械の
心押センタ構造にある。 The purpose of the present invention is to eliminate these inconveniences, and its gist is a tailstock center that is fitted into a conical center hole on the end face of a workpiece, and a conical center at the tip of the tailstock center. A bearing member made of porous ceramic is provided, a supply hole is formed inside the tailstock center, compressed air or pressure oil is supplied to the inside of the bearing member through the supply hole, and the compressed air or pressure oil is supplied to the inside of the bearing member through the supply hole. A tailstock center structure for a machine tool is characterized in that it is provided with a supply section for compressed air or pressurized oil that is blown out from the outer surface of a bearing member.

[Effect]

供給孔を介して軸受部材内部に圧縮空気又は圧
油を供給すると、それらは軸受部材の外表面から
噴出し、センタ穴内面に衝突し、センタ穴内面と
軸受部材外表面との間隙に空気膜層又は油膜層を
形成する。 When compressed air or pressure oil is supplied into the bearing member through the supply hole, it is ejected from the outer surface of the bearing member and collides with the inner surface of the center hole, creating an air film in the gap between the inner surface of the center hole and the outer surface of the bearing member. Forms a layer or oil film layer.

〔Example〕

第１，２図は本考案を適用した心押センタ構造
の実施例を示し、１は加工物、２はその円錐状の
センタ穴である。 Figures 1 and 2 show an embodiment of the tailstock center structure to which the present invention is applied, in which 1 is a workpiece and 2 is its conical center hole.

３は心押台、４は心押センタであつて、その先
端部には円錐状の多孔質セラミツク製の軸受部材
５が取付けられ、心押センタ４の中心軸線上内部
には供給孔６が形成され、供給孔６は図外の圧縮
空気源又は油圧源たる圧縮空気又は油圧の供給部
に連通されている。 3 is a tailstock, and 4 is a tailstock center. A conical bearing member 5 made of porous ceramic is attached to the tip of the tailstock, and a supply hole 6 is provided inside the tailstock center 4 on the center axis. The supply hole 6 is connected to a compressed air or hydraulic pressure supply section, which is a compressed air source or hydraulic pressure source (not shown).

[Effect of idea]

本考案は上述の如く構成したから、軸受部材の
外表面から噴出する圧縮空気又は圧油によつてセ
ンタ穴内面と軸受部材外表面との間隙に空気膜層
又は油膜層が形成され、このため無接触状態で加
工物を支持でき、摩擦が著しく低下し、このため
加工物の回転性を向上でき、心押センタ先端部の
摩損に伴う精度低下も防止でき、超精密切削及び
研削を可能にできる。 Since the present invention is configured as described above, an air film layer or an oil film layer is formed in the gap between the inner surface of the center hole and the outer surface of the bearing member by the compressed air or pressure oil jetted from the outer surface of the bearing member. The workpiece can be supported without contact, and friction is significantly reduced. This improves the rotatability of the workpiece. It also prevents precision loss due to wear and tear on the tip of the tailstock center, making ultra-precision cutting and grinding possible. can.

以上、所期の目的を充分達成することができ
る。 As described above, the intended purpose can be fully achieved.

[Brief explanation of the drawing]

図面は本考案の一実施例を示すもので、第１図
は要部断面図、第２図はその拡大断面図である。１……加工物、２……センタ穴、４……心押セ
ンタ、５……軸受部材、６……供給孔。 The drawings show one embodiment of the present invention, with FIG. 1 being a sectional view of a main part, and FIG. 2 being an enlarged sectional view thereof. 1... Workpiece, 2... Center hole, 4... Tailstock center, 5... Bearing member, 6... Supply hole.

Claims

[Scope of utility model registration request]

A tailstock center structure for a machine tool, which is a tailstock center to be fitted into a conical center hole in an end face of a workpiece, a conical porous ceramic bearing member is provided at the tip of the tailstock center, a supply hole is formed inside the tailstock center, compressed air or pressurized oil is supplied to the inside of the bearing member through the supply hole, and a compressed air or pressurized oil supply section is provided which causes the compressed air or pressurized oil to be sprayed from the outer surface of the bearing member.