Turret device
An outer cylinder unit ( 20 ) of a turret device ( 1 ) has a cylindrical housing space ( 24 ) in a front side thereof and has a coolant discharge flow path ( 22 ) opened as a connection port ( 22 a ) in an inner peripheral surface ( 24 a ) of the housing space ( 24 ), and the connection port ( 22 a ) is formed at a predetermined pitch interval in a circumferential direction. A coolant supply mechanism ( 25 ) arranged on an end of a shaft unit ( 10 ) is disposed in the housing space ( 24 ) and an opening of the outer cylinder unit ( 20 ) is closed by a lid ( 39 ). The coolant supply mechanism ( 25 ) includes a reciprocating rod ( 30 ) advancing and retracting with respect to the inner peripheral surface ( 24 a ) of the housing space ( 24 ) and a shaft receiving unit ( 26 ) supporting the reciprocating rod ( 30 ). The reciprocating rod ( 30 ) has a supply hole ( 34, 53 ) opened in a distal end thereof and has an annular elastic body ( 50 ) arranged to surround the opening of the supply hole ( 34, 53 ). When the reciprocating rod ( 30 ) advances, the elastic body ( 50 ) comes into contact with the inner peripheral surface ( 24 a ) of the housing space ( 24 ) to surround the connection port ( 22 a ) in the inner peripheral surface ( 24 a ).
1 . A turret device comprising:
a shaft unit, the shaft unit being non-rotatable and having at least one supporting part with an outer peripheral surface of a cylindrical shape; and
an outer cylinder unit comprising a hollow polygonal prismatic body having openings at opposing ends thereof, the outer cylinder unit having, at least on each planar surface of an outer periphery thereof, a respective attachment surface for attaching a tool thereto,
wherein:
the outer cylinder unit has at least one supported part having a corresponding inner peripheral surface of a cylindrical shape, and the outer cylinder unit is rotatably supported by the shaft unit with the at least one supported part externally fitted on the at least one supporting part of the shaft unit which is inserted through a first one of the openings;
the turret device is configured to index each of the attachment surfaces formed on the outer peripheral surface of the outer cylinder unit into a predetermined machining position;
the outer cylinder unit has, on a side of a second one of the openings, a housing space having a corresponding inner peripheral surface of a cylindrical shape and further has a coolant discharge flow path opened as a connection port in the inner peripheral surface of the housing space; the connection port being formed at a predetermined pitch interval in a circumferential direction in correspondence with the attachment surfaces;
a coolant supply mechanism arranged on an end of the shaft unit is disposed in the housing space of the outer cylinder unit, and the second one of the openings of the outer cylinder unit is closed by a lid;
the coolant supply mechanism includes:
a reciprocating rod disposed along a radial direction of the outer cylinder unit and configured to advance and retract with respect to the inner peripheral surface of the housing space; and
a shaft receiving unit supporting the reciprocating rod in such a manner as to allow the reciprocating rod to advance and retract, the shaft receiving unit including a drive unit configured to advance and retract the reciprocating rod;
the drive unit includes:
a piston externally fitted onto the reciprocating rod;
a pressure chamber formed in the shaft receiving unit; and
by supplying pressure fluid into the pressure chamber on a front side of the piston in an advancing and retracting direction, the reciprocating rod is retracted from the inner peripheral surface of the housing space;
the reciprocating rod has a supply hole bored along an axis of the reciprocating rod and opened in a distal end of the reciprocating rod, and the reciprocating rod has an annular elastic body arranged on the distal end thereof to surround the supply hole; and
when the reciprocating rod is advanced, the elastic body comes into contact with the inner peripheral surface of the housing space to surround the connection port formed in the inner peripheral surface of the housing space.
2 . The turret device according to claim 1 , wherein:
the pressure chamber has the piston inserted therein; and
by supplying pressure fluid into the pressure chamber on a rear side of the piston in the advancing and retracting direction, the reciprocating rod is advanced toward the inner peripheral surface of the housing space.
3 . The turret device according to claim 1 , wherein:
the reciprocating rod has a stepped portion on an intermediate portion thereof and further has a small diameter portion on a rear side in the advancing and retracting direction and a large diameter portion on a front side in the advancing and retracting direction;
the shaft receiving unit has an annular contact surface configured to come into contact with an entire surface of the large diameter portion of the reciprocating rod, wherein the contact surface provides sealing in cooperation with the large diameter portion when the reciprocating rod is retracted, and said contact surface separates from the large diameter portion when the reciprocating rod is advanced;
the shaft receiving unit further has a coolant supply chamber formed in a predetermined area including the contact surface in the advancing and retracting direction;
the reciprocating rod has a connection port formed in an outer peripheral surface thereof on the rear side of the stepped portion, the connection port communicating with the supply hole; and
a coolant supply flow path formed in the shaft unit and connected to a predetermined coolant supply source is opened in the coolant supply chamber on the front side of the contact surface in the shaft receiving unit.
4 . The turret device according to claim 1 , wherein the elastic body is detachably mounted via a holding member on the distal end of the reciprocating rod.
5 . The turret device according to claim 1 , wherein a front end surface of the elastic body is formed in a convex curved surface having a predetermined curvature.
6 . The turret device according to claim 1 , wherein the at least one supporting part of the shaft unit and the at least one supported part of the outer cylinder unit externally fitted on the at least one supporting part are liquid-tightly sealed therebetween by a sealing member.