Patent ID: 6626075
Filing Date: 2003-09-30
Classification: B23B,B23P,B23Q,Y10T

Abstract:
A composite NC lathe, comprising:a left main shaft and a right main shaft facing each other on a first axis; a left turret rest and a right turret rest positioned on a lower front side of the respective left and right main shafts when viewed from an operator; a third tool rest positioned on an upper rear side of the left and right main shafts when viewed from the operator and has a tool spindle directed toward a work; a tool magazine for holding tools to be fixed to the third tool rest; and an automatic tool changing device for changing tools between the tool magazine and third tool rest; wherein the left and right main shafts comprise respective main shaft motors capable of controlling angles around the first axis and capable of being driven independently and being synchronized with each other, wherein the third tool rest is movable in a direction of the first axis, a direction of a second axis, the direction of the second axis being a tool feeding direction, and a direction of a third axis which is orthogonal to the first and second axial directions, and wherein the tool spindle is provided on the third tool rest, the tool spindle is capable of controlling an angular position of the tool spindle around the third axis and fixing the angular position of the tool spindle, the left turret rest includes a left tool turret and the right tool rest includes a right tool turret, and strokes of the left and right tool turrets in the first axial direction range from a left end position opposite to a work gripped by the left main shaft to a right end position opposite to the work gripped by the right main shaft.