Steel strip notching method, cold rolling method, and method for producing cold-rolled steel strip

A steel strip notching method comprising:

• forming a notch at an end portion of a joint of a steel strip in a strip width direction, the joint being formed by joining a trailing end of a preceding steel strip to a leading end of a succeeding steel strip;
• and
• removing at least part of a region of the notch through grinding by:
• cutting the region with a rotary grinding tool by feeding the rotary grinding tool in the strip width direction,
• feeding the rotary grinding tool in a strip vertical direction at a feed rate within a predetermined range with respect to a feed rate of the rotary grinding tool in the strip width direction,
• giving a predetermined feed amount in a strip longitudinal direction while feeding the rotary grinding tool by a predetermined feed amount in the strip width direction simultaneously with feeding the rotary grinding tool in the strip vertical direction, and
• cutting the region while oscillating the rotary grinding tool in the strip longitudinal direction.