Hairpin coil flattening control system and method therefor

A method for processing a rectangular material from a coil, the method comprising:

• identifying, by a reader and based on batch information on a bobbin, information on physical properties of the rectangular material;
• disposing, based on a thickness and a width of the rectangular material, a plurality of flattening rollers at clamp positions of upper and lower sides of the rectangular material and left and right sides of the rectangular material;
• based on an initial yield strength of the coil based on the batch information and a reference graph of a pressing amount for each batch of the bobbin, deriving a target yield strength corresponding to the batch information;
• determining, based on a deviation of the initial yield strength from the target yield strength, a maximum pressing amount of an individual flattening roller of the plurality of flattening rollers;
• and
• controlling, based on the maximum pressing amount, the individual flattening roller.

An apparatus comprising:

• a plurality of flattening rollers configured to flatten a rectangular material unwound from a coil wound on a bobbin, wherein the plurality of flattening rollers are positioned on upper and lower sides of the unwound rectangular material and on left and right sides along a lengthwise direction of the unwound rectangular material;
• a mold configured to transform the flattened rectangular material into a hairpin configuration;
• a reader configured to recognize, based on scanning an identification code of the bobbin, batch information;
• and
• a controller configured to:
• store, based on the batch information, a reference graph of a pressing amount for each batch of the bobbin set through a test;
• calculate, based on the stored reference graph and a change in physical properties of the rectangular material, a pressing amount for the rectangular material;
• and
• selectively control, based on the calculated pressing amount, a pressing amount of an individual flattening roller of the plurality of flattening rollers.