Research on NC machining technology of extrusion screw

The screw extruder is widely applied in material compression, transportation and mixture, procedures in chemical industry, rubber machinery, foodstuff and so on. The extrusion screw, as a key part of extruder, has high requirement for its shape and capability. Aimed at the characteristic of complex shapes of extrusion screw, such as varying lead, varying head number, varying ground radius, taper and so on, this paper presents a technology that can process all kinds of complex shaped screw by using the same end mill, just by changing the position of the end mill. It determines the machining path, realizes the auto-programming of screw machining process, and accomplishes the application of this technology based on NC machine of four universal driving shafts.