Cold rolling facility, cold rolling method, and manufacturing method of metal plate

A cold rolling facility comprising:

• a cold tandem mill including a plurality of rolling stands;
• a supply controller;
• and
• a rolling supply system configured to supply rolling oil to the cold tandem mill,
• wherein the rolling supply system includes
• a first rolling oil supply system that includes:
• a first rolling oil pipe line having one end portion connected to a clean tank;
• and
• a lubrication coolant header and a cooling coolant header that are branched at another end portion of the first rolling oil pipe line, the first rolling oil supply system being configured to supply first emulsion rolling oil, and
• a second rolling oil supply system that includes:
• a second rolling oil pipe line having one end portion connected to the first rolling oil pipe line;
• a third rolling oil pipe line having one end portion connected to an emulsion tank;
• a flow rate control valve connected to the second rolling oil pipe line and the third rolling oil pipe line, the flow rate control valve being configured to form mixed rolling oil in accordance with a command from the supply controller;
• a lubrication coolant header;
• and
• a mixed rolling oil pipe line having one end connected to the flow rate control valve and another end connected to the lubrication coolant header, the second rolling oil supply system being configured to supply second emulsion rolling oil having a higher concentration than the first emulsion rolling oil, and
• wherein the supply controller is configured to supply the mixed rolling oil obtained by mixing the first emulsion rolling oil and the second emulsion rolling oil at least to a specific rolling stand among the plurality of rolling stands in such a manner as to satisfy the following formula (2),
• 0.6≤F3/F1≤1.4 (2),
• where F1 denotes first horizontal force acting in a rolling direction on a roll included in the specific rolling stand,
• and F3 denotes third horizontal force identified based on a past rolling result of the specific rolling stand.

A method for cold-rolling a rolling object material, the method comprising:

• providing a cold rolling facility comprising:
• a cold tandem mill including a plurality of rolling stands;
• a supply controller;
• and
• a rolling supply system configured to supply rolling oil to the cold tandem mill,
• wherein the rolling supply system includes
• a first rolling oil supply system that includes:
• a first rolling oil pipe line having one end portion connected to a clean tank;
• and
• a lubrication coolant header and a cooling coolant header that are branched at another end portion of the first rolling oil pipe line, the first rolling oil supply system being configured to supply first emulsion rolling oil, and
• a second rolling oil supply system that includes:
• a second rolling oil pipe line having one end portion connected to the first rolling oil pipe line;
• a third rolling oil pipe line having one end portion connected to an emulsion tank;
• a flow rate control valve connected to the second rolling oil pipe line and the third rolling oil pipe line, the flow rate control valve being configured to form mixed rolling oil in accordance with a command from the supply controller;
• a lubrication coolant header;
• and
• a mixed rolling oil pipe line having one end connected to the flow rate control valve and another end connected to the lubrication coolant header, the second rolling oil supply system being configured to supply second emulsion rolling oil having a higher concentration than the first emulsion rolling oil,
• cold-rolling the rolling object with the cold rolling facility;
• and
• supplying the mixed rolling oil obtained by mixing the first emulsion rolling oil and the second emulsion rolling oil at least to a specific rolling stand among the plurality of rolling stands in such a manner as to satisfy:
• option A) the following formula (1),
• 0.6≤F2/F1≤1.4 (1),
• where F1 denotes first horizontal force acting in a rolling direction on a roll included in the specific rolling stand, and
• F2 denotes second horizontal force acting in a rolling direction on a roll included in an upstream side rolling stand arranged on an upstream side of the specific rolling stand and neighboring with the specific rolling stand;
• or
• option B) the following formula (2),
• 0.6≤F3/F1≤1.4 (2),
• where F3 denotes third horizontal force identified based on a past rolling result of the specific rolling stand.

A manufacturing method of a metal plate, the method comprising:

• providing a cold rolling facility comprising:
• a cold tandem mill including a plurality of rolling stands;
• a supply controller;
• and
• a rolling supply system configured to supply rolling oil to the cold tandem mill,
• wherein the rolling supply system includes
• a first rolling oil supply system that includes:
• a first rolling oil pipe line having one end portion connected to a clean tank;
• and
• a lubrication coolant header and a cooling coolant header that are branched at another end portion of the first rolling oil pipe line, the first rolling oil supply system being configured to supply first emulsion rolling oil, and a second rolling oil supply system that includes:
• a second rolling oil pipe line having one end portion connected to the first rolling oil pipe line;
• a third rolling oil pipe line having one end portion connected to an emulsion tank;
• a flow rate control valve connected to the second rolling oil pipe line and the third rolling oil pipe line, the flow rate control valve being configured to form mixed rolling oil in accordance with a command from the supply controller;
• a lubrication coolant header;
• and
• a mixed rolling oil pipe line having one end connected to the flow rate control valve and another end connected to the lubrication coolant header, the second rolling oil supply system being configured to supply second emulsion rolling oil having a higher concentration than the first emulsion rolling oil,
• cold-rolling a rolling object material into the metal plate with the cold rolling facility;
• and
• supplying the mixed rolling oil obtained by mixing the first emulsion rolling oil and the second emulsion rolling oil at least to a specific rolling stand among the plurality of rolling stands in such a manner as to satisfy:
• option A) the following formula (1),
• 0.6≤F2/F1≤1.4 (1),
• where F1 denotes first horizontal force acting in a rolling direction on a roll included in the specific rolling stand, and
• F2 denotes second horizontal force acting in a rolling direction on a roll included in an upstream side rolling stand arranged on an upstream side of the specific rolling stand and neighboring with the specific rolling stand;
• or
• option B) the following formula (2),
• 0.6≤F3/F1≤1.4 (2),
• where F3 denotes third horizontal force identified based on a past rolling result of the specific rolling stand.