1. A water jet processing method for cutting a workpiece having a first group composed of first plural cutting lines extending
in a predetermined direction and a second group composed of second plural cutting lines formed perpendicular to the first
plural cutting lines by injecting a water jet along the first plural cutting lines and the second plural cutting lines formed
on the workpiece, comprising the steps of:
a first cutting step for repeating a first step for moving the water jet and the workpiece relative to each other from one
end to the other end of a first cutting line of the first cutting lines formed on one side of the first group formed on the
workpiece while the water jet is injected along the first cutting line, a second step for moving the water jet and the workpiece
relative to each other from the other end of the first cutting line of the first cutting lines to the other end of a second
cutting line adjacent to the first cutting line of the first cutting lines, a third step for moving the water jet and the
workpiece relative to each other along the second cutting line of the first cutting lines, and a fourth step for moving the
water jet and the workpiece relative to each other from one end of the second cutting line of the first cutting lines to one
end of a third cutting line adjacent to the second cutting line of the first cutting lines, up to the last cutting line of
the first cutting lines formed on the other side of the first group formed on the workpiece; and
a second cutting step for repeating a first step for moving the water jet and the workpiece relative to each other from one
end to the other end of a first cutting line of the second cutting lines formed on one side of the second group formed on
the workpiece while the workpiece which has undergone the first cutting step is supported by a support member having through-grooves
corresponding to the cutting lines of the second group formed on workpiece and the water jet is injected along the first cutting
line, a second step for moving the water jet and the workpiece relative to each other from the other end of the first cutting
line to the other end of a second cutting line adjacent to the first cutting line of the second cutting lines, a third step
for moving the water jet and the workpiece relative to each other from the other end to one end along the second cutting line
of the second cutting lines, and a fourth step for moving the water jet and the workpiece relative to each other from one
end of the second cutting line to one end of a third cutting line adjacent to the second cutting line of the second cutting
lines, up to the last cutting line of the second group formed on the other side of the second group.
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