Positioning fixture for turning

The utility model discloses a positioning fixture for turning. The positioning fixture comprises a spring chuck (1), a positioning rod (2), a positioning nut (3) and a fastening nut (4), the rear section of an inner hole of the spring chuck (1) is connected with an outer cylindrical thread of the positioning nut (3) in a matched mode, the positioning rod (2) extends into the bottom of the inner hole of the spring chuck and is assembled with an inner thread of the positioning nut (3) in a matched mode, and the fastening nut (4) is arranged on the positioning rod (2) in a sleeved mode to press the outer end face of the positioning nut (3) so as to ensure that the positioning rod (2) is reliably fixed in the axial direction. The utility model has the advantage of improving the workpiece processing and positioning precision and the production switching efficiency. 本实用新型公开了一种用于车削加工的定位夹具，它包括弹簧夹头（1）、定位杆（2）、定位螺母（3）和紧固螺母（4）；所述弹簧夹头（1）的内孔后段与定位螺母（3）外圆柱螺纹配合装接，定位杆（2）伸入弹簧夹头的内孔底部、且与定位螺母（3）内螺纹配合组装，紧固螺母（4）套在定位杆（2）上压紧定位螺母（3）外端面