Spindle device for machine tools
AssigneeMori Seiki Co., Ltd.
InventorsMasamitsu Nakaminami, Kazuhiko Matsumoto
Life of this patent
Estimating the term…
Abstract
A spindle device for machine tools that can eliminate the need for laborious air bleeding work and labor-demanding fitting/removing work for maintenance. The spindle device for machine tools includes a drawbar that is axially movably inserted into an axial hole of a tool spindle body. The drawbar serves to bias a tool in a clamping direction. An unclamping cylinder mechanism is provided in a rear of the tool spindle and serves to move the drawbar in an unclamping direction. The unclamping cylinder mechanism has a cylinder block fixed to a rear end wall of the tool spindle body and includes a plurality of bolts. A relay oil passage allows a hydraulic passage in the tool spindle body and a hydraulic passage in the cylinder block to communicate with each other.
Claims15
A spindle device for a machine tool, comprising:
- a tool spindle body having an axial hole therein;
- a drawbar movably disposed in the axial hole of said tool spindle body for biasing a tool in a clamping direction;
- and
- an unclamping cylinder mechanism provided at a rear portion of said tool spindle body for moving the drawbar in an unclamping direction, said unclamping cylinder mechanism including a cylinder block having a hydraulic passage therein, said cylinder block being connectable to a rear end wall of said tool spindle body with a plurality of bolts, a relay oil passage partially disposed in one of said plurality of bolts for allowing hydraulic fluid to communicate with said hydraulic passage in said cylinder block, and the unclamping cylinder mechanism being supportable by said one of said plurality of bolts so as to be pivotable between a locked position and a released position.
A tool post, comprising:
- a tool post body including an upper wall;
- a rotary union mounted on said upper wall of said tool post body, said rotary union having a cylindrically shaped first union member and a columnar shaped second union member, said second union member being disposed in said first union member so as to be rotatable relative thereto, said second union member having a plurality of axially extending flow passages therein and a plurality of inlets, each of said inlets being connected to a respective one of said axially extending flow passages and wherein said plurality of inlets being formed in said second union member with predetermined circumferential angular spacing and wherein said plurality of inlets each has a longitudinal axis that is disposed substantially perpendicular to a longitudinal axis of said second union member.
A machine tool comprising:
- a tool spindle body having an axial hole therein and an upper wall;
- a drawbar movably disposed in the axial hole of said tool spindle body for biasing a tool in a clamping direction;
- and
- an unclamping cylinder mechanism provided at a rear portion of said tool spindle body for moving the drawbar in an unclamping direction, said unclamping cylinder mechanism including a cylinder block having a hydraulic passage therein, said cylinder block being connectable to a rear end wall of said tool spindle body with a plurality of bolts, a relay oil passage partially disposed in one of said plurality of bolts for allowing hydraulic fluid to communicate with said hydraulic passage in said cylinder block, and the unclamping cylinder mechanism being supportable by said one of said plurality of bolts so as to be pivotable between a locked position and a released position;
- and
- a rotary union mounted on said upper wall of said spindle tool body, said rotary union having a cylindrically shaped first union member and a columnar shaped second union member, said second union member being disposed in said first union member so as to be rotatable relative thereto, said second union member having a plurality of axially extending flow passages therein and a plurality of inlets, each of said inlets being connected to a respective one of said axially extending flow passages.
Dependencies are inferred from the claim text.