Workpiece holder and method for slicing workpiece

A method for slicing a workpiece, comprising pressing a workpiece made of a columnar single crystal held by a workpiece holder against a wire row of a wire saw to slice the workpiece with the use of the wire saw comprising the wire row formed by winding a wire which reciprocatively travels in an axial direction around a plurality of grooved rollers,

• wherein the workpiece holder comprises:
• a workpiece plate which is bonded and fixed to the workpiece through a pad plate;
• and
• a holder main body which supports the workpiece plate from a surface of the workpiece plate, the surface being an opposite side of another surface of the workpiece plate to which the workpiece is bonded and fixed,
• assuming that, of radial directions of the workpieces, a direction parallel to the surface of the workpiece plate to which the workpiece is bonded and fixed is an x axis direction and a direction vertical to the surface of the workpiece plate to which the workpiece is bonded and fixed is a y axis direction, the workpiece plate is bonded and fixed to the workpiece so as to correct a deviation of a crystal orientation axis of the workpiece in the x axis direction,
• the workpiece holder has a function to adjust a tilt in the y axis direction of the workpiece held by the workpiece plate by tilting the workpiece plate in the y axis direction and to enable fixing the workpiece plate and the workpiece to the holder main body at the adjusted tilt,
• the workpiece plate has a protruding portion, which protrudes toward an outer side of the workpiece plate in a longitudinal direction and has a curved tip portion, on the surface thereof on the opposite side of another surface thereof on which the workpiece is held,
• the holder main body has a receiving portion which sandwiches the curved tip portion of the protruding portion from upper and lower sides, the receiving portion sandwiches the curved tip portion of the protruding portion from the upper and lower sides by two forward-and-backward movable pieces, and each of the two movable pieces is formed into a tapered shape having a tilt on a surface thereof which comes into contact with the curved tip portion of the protruding portion, and
• the workpiece holder being configured to tilt the workpiece plate in the y axis direction by adjusting a positional relationship of the two movable pieces, which sandwich the curved tip portion of the protruding portion, by each forward or backward movement, to adjust a tilt of the workpiece in the y axis direction, and to fix the workpiece at this position,
• the workpiece plate is bonded and fixed to the workpiece so as to correct a deviation of the crystal orientation axis of the workpiece in the x axis direction at the time of holding the workpiece by the workpiece holder,
• a tilt in the y axis direction of the workpiece held by the workpiece plate is adjusted by tilting the workpiece plate bonded and fixed to the workpiece in the y axis direction, and the workpiece is held by the workpiece holder by fixing the workpiece plate and the workpiece to the holder main body at the adjusted tilt, and
• the workpiece fixed by adjusting the tilt is disposed to the wire saw through the workpiece holder, and the workpiece is pressed against the wire row to slice the workpiece.