Patent ID: 8424427

Claim:
A roll surface machining method for forming a three-dimensional pattern of protrusions or recesses in a helical arrangement at a predetermined lead angle in the surface of a roll by using a NC roll turning lathe provided with an indexing axis (C-axis) roll motor and Z-axis motor for controlling a position of a cutting tool in the axial direction, and a NC control unit constructed and arranged to calculate C-Z axis interpolation data with a start position of the cutting tool and a lead angle as inputs using a C-Z axis interpolation function, said method comprising: setting a machining start position of the cutting tool with respect to the surface of the roll by C-axis indexing of the roll with respect to the cutting tool and positioning of the cutting tool in an axial direction (Z-axis direction) with respect to the roll; and rotating the roll and moving the cutting tool in the axial direction of the roll while controlling the position of the cutting tool to form a first groove in a first direction, reposition the tool to a second start position, and use the C-Z axis interpolation data to control the roll motor and the saddle motor to synchronize rotation of the roll and movement of the cutting tool in the axial direction of the roll starting from the second start position to form a second groove in the first direction, thereby forming the three-dimensional pattern in the surface of the roll, and repeating the setting and the rotating to form the three-dimensional pattern in the surface of the roll.