An Analysis of Profile Error for Resharpened Screw Rotor Hob, Relieved with Pencil Type Grinding Wheel.

A new method is proposed for calculating the profile of the cutting edge of the screw rotor hob. It is first gourd with a pencil type grinding wheel and then msharpened. When the profile of a pencil wheel is given as a dispersive points, theoretical equations are derived from them which represent the profile of the cutting edge after the resharpening. The profile error of the cutting edge of the hob was 16μm by the numerical analysis when the resharpening angle of the hob was 5 degrees. The calculation is made for the profile of the screw rotor which is cut by using the resharpened hob. Finally, it is clarified that the relationship between the resharpening angle of the hob and the profile error of the screw rotor.