BACK PROCESSING METHOD AND BACK PROCESSING DEVICE IN NC AUTOMATIC LATHE

摘要

PROBLEM TO BE SOLVED: To process the back face of a work without increasing the shaft numbers of a NC device by moving a back processing device toward a sub- spindle through a material by utilizing the movement of a spindle stock. ;SOLUTION: A drill 28 is conformed to the shaft center of a work W1 on a sub-spindle 12 side. When the rotation of a main spindle is stopped, and a spindle stock 3 is advanced toward the sub-spindle 12 side, the main spindle 31 is also advanced while holding a material W, and the tip of the material W touches the rear end of a drill spindle 23. When the spindle stock 3 is further advanced, the drill spindle 23 is pushed on the sub-spindle 12 side while contracting a return spring 26, a drilling can be performed to the back face of the work W1.;COPYRIGHT: (C)1997,JPO