Roll state monitor device

A roll state monitor device comprising:

• a rolling force detector configured to detect rolling force of a monitored roll selected from an upper roll set and a lower roll set when a rolled material is rolled between the upper roll set and the lower roll set, the upper roll set having at least one roll and the lower roll set having at least one roll;
• a force variation value extractor configured to extract a rolling force variation value which is a value of each rolling force for each rotation position of the monitored roll;
• an identification part configured to identify a roll eccentricity amount for each rotation position of the monitored roll based on the rolling force variation value;
• a recorder recording a plurality of roll eccentricity amounts identified by the identification part in accordance with a plurality of rotation positions of the monitored roll in a first rolling period which is determined in advance;
• and
• a roll state determining part determining state of the monitored roll in a second rolling period which is after the first rolling period, based on a normal roll eccentricity amount representative value which is a first representative value calculated from the plurality of the roll eccentricity amounts identified by the identification part in the first rolling period, and based on a plurality of roll eccentricity amounts identified by the identification part in accordance with a plurality of rotation positions of the monitored roll in the second rolling period, the normal roll eccentricity amount representative value being any one of a normal roll eccentricity amount peak-to-peak value, a normal roll eccentricity amount maximal average value, and a normal roll eccentricity amount minimal average value.

A roll state monitor device comprising:

• a rolling force detector configured to detect rolling force of a monitored roll selected from an upper roll set and a lower roll set when a rolled material is rolled between the upper roll set and the lower roll set, the upper roll set having at least one roll and the lower roll set having at least one roll;
• a force variation value extractor configured to extract a rolling force variation value which is a value of each rolling force for each rotation position of the monitored roll;
• an identification part configured to identify a roll eccentricity amount for each rotation position of the monitored roll based on the rolling force variation value;
• a recorder recording a plurality of roll eccentricity amounts identified by the identification part in accordance with a plurality of rotation positions of the monitored roll in a first rolling period which is determined in advance, the first rolling period being a period required to roll one or a plurality of the rolled materials;
• and
• a roll state determining part determining a state of the monitored roll in a second rolling period which is after the first rolling period, based on a normal roll eccentricity amount representative value which is a first representative value calculated from the plurality of the roll eccentricity amounts identified by the identification part in the first rolling period, and based on a plurality of roll eccentricity amounts identified by the identification part in accordance with a plurality of rotation positions of the monitored roll in the second rolling period, the second rolling period being a period having a same length as the first rolling period.