Die for machining inner groove of steel pipe

The utility model relates to the technical field of metal pipe fitting machining, in particular to a die for machining an inner groove of a steel pipe. The die consists of a frustum part, a connecting part and a cylindrical part; the frustum-shaped frustum part and the cylindrical part are connected through a connecting part; a plurality of axial raised lines are formed on the frustum part, the connecting part and the cylindrical part in the circumferential direction; and the number of the raised lines and the layout on the circumference are arranged according to the inner grooves required for processing the steel pipe. Cold-drawing forming of the inner groove of the steel pipe can be achieved; the inner groove of the steel pipe can be machined. 本实用新型涉及金属管件加工技术领域，尤其是一种实现钢管内槽加工的模具。所述的模具由锥台部、连接部和圆柱部组成；锥台状的锥台部和圆柱状的圆柱部通过连接部连接；沿着圆周方向，锥台部、连接部和圆柱部上形成若干轴向的凸条；凸条的数量和圆周上的布局按照加工钢管所需的内槽而布设。本实用新型可以实现钢管内槽的冷拔成型；可以钢管内槽的加工。