Roll manufacturing method, roll manufacturing apparatus, roll, and transfer object

A roll manufacturing apparatus comprising:

• a rotary device configured to rotate a cylindrical or columnar roll in a circumferential direction and including a rotary encoder that output a signal corresponding to a rotational position of the roll;
• a cutting tool stage movable in a radial direction of the roll, the cutting tool stage being configured to hold a spindle unit reciprocatably in the radial direction of the roll, the spindle unit including a cutting blade rotatable with the radial direction of the roll as a rotation axis;
• a signal generator configured to generate, based on the signal output from the rotary encoder, a control waveform indicating a movement pattern of the cutting blade to reciprocate the cutting blade in the radial direction of the roll at a position corresponding to a predetermined cutting portion on a surface of the roll;
• and
• a controller configured to move the cutting tool stage in the radial direction of the roll so that a cutting process of reciprocating the cutting blade in the radial direction of the roll while rotating the cutting blade, according to the control waveform, to cut the predetermined cutting portion once or multiple times with the reciprocating cutting blade at a predetermined cutting depth is performed multiple times.

A cylindrical or columnar roll comprising a surface made of metal or an alloy,

• wherein
• a plurality of recesses is formed in an array on the surface of the roll,
• a wall surface of each of the recesses constitutes a part of a sphere, and
• d≥5 μm,θ≥40°
• wherein d represents a depth of each of the recesses, and θ represents an incident angle that is an inclination of the wall surface of each of the recesses, with respect to the surface of the roll, at an opening end of each of the recesses.