Method for slicing workpiece and wire saw

A wire saw comprising:

• a wire row formed of a fixed abrasive grain wire which has abrasive grains secured to a surface thereof and is wound around a plurality of grooved rollers;
• a workpiece-feeding mechanism configured to press a workpiece against the wire row while holding the workpiece;
• and
• a coolant-supplying mechanism configured to supply a coolant onto the wire row, wherein
• the workpiece-feeding mechanism feeds the workpiece for slicing to the wire row to which a coolant is being supplied by the coolant-supplying mechanism while the fixed abrasive grain wire reciprocatively travels in an axial direction thereof, thereby slicing the workpiece at a plurality of positions aligned in an axial direction of the workpiece simultaneously,
• wherein the coolant-supplying mechanism supplies a coolant for workpiece slicing onto the wire row when the workpiece is being sliced with the fixed abrasive grain wire, and supplies a coolant for workpiece drawing, which is different from the coolant for workpiece slicing and has a higher viscosity than the coolant for workpiece slicing, onto the wire row when the workpiece is drawn out from the wire row after the slicing of the workpiece.