Rolled part temperature obtaining method and device for plate-strip hot-rolling production line

The invention discloses a rolled part temperature collection method for a plate and strip hot rolling production line, which comprises the following steps of: constructing equipment arrangement of theplate and strip hot rolling production line, and obtaining related process parameters; dividing a rolled part heat exchange area according to equipment arrangement on the production line, wherein theheat exchange area comprises an air cooling area, a water cooling area, a roll gap contact heat conduction area and a heat radiation heat preservation area; dividing width-thickness section grid nodes of the rolled part, and establishing coordinate system parameters and a temperature calculation model of each node; obtaining initial temperature distribution of the rolled part at the initial calculation position; from the initial calculation position to the final calculation position, the heat exchange area where the rolled part section is located is judged firstly when calculation is conducted every time, and then the