Nowadays taper threads and variable pitch threads are widely used in mechanical, medical, and other sectors. Taper threads are generally used for fixing objects to others such as wood. Variable pitch threads are mainly useful for fastening objects to soft materials with some elasticity due to their fastening characteristics changed with forward movement. For this reason, screws with the two characteristics combined are now designed and widely used. However, there are some disadvantages for machining these screws.
Kim Hak Song, a section head at the Faculty of Mechanical Science and Technology, has put forth the problems arising in the design and machining of variable pitch threads, and proposed a method for calculation of tool path and generation of NC program for cutting them on 5-axis CNC tool grinder and for virtual cutting simulation by virtual cutting simulation program VERICUT8.2.
The proposed method can be used in the design and manufacturing of implants and transmission system of taper threads with variable pitch.
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