Method for differential temperature rolling of composite strips based on actions of friction roller and device thereof

A method for differential temperature rolling of composite strips based on actions of a friction roller, comprising steps of:

• S1:
• preparing a metal strip to be bonded (2), and performing surface treatment on the metal strip to be bonded (2);
• S2:
• frictionally heating the metal strip to be bonded (2) by a plurality of sets of friction roller heating devices (3), measuring a surface temperature of the friction-heated metal strip to be bonded (2) by a temperature detector (4);
• according to a measured temperature, adjusting a rotation speed of the friction roller (9) in the friction roller heating devices (3);
• the friction roller is a high-speed rotating roller with a rotation speed in a range of 2000-20000 r/min, utilizing a friction and heat generation effect of the friction roller (9) rotating at a high speed with the metal strip (2) to be bonded, heating both sides of the metal strip (2) to be bonded or an independent heating of the metal strip to be bonded on one side by adjusting the speed of the friction roller (9), thereby generating different temperature rises to realize the differential temperature rolling of the metal strip (2) to be bonded, each friction roller heating device of the plurality of sets of friction roller heating devices contains an upper friction roller and a lower friction roller, and that each friction roller meets all limitations described in the step S2 mentioned above, a surface roughness of each of the upper friction roller and the lower friction roller in the friction roller heating devices (3) is different, and different friction coefficients are produced when they contact the upper and lower surfaces of the metal strip (2) to be bonded;
• combining pressing of the friction roller (9) and the high-speed rotation, the metal strip (2) to be bonded forms a temperature gradient along a thickness direction, a direction of a friction force acting on the metal strip (2) to be bonded by the friction roller (9) is opposite to a rolling direction, which generates tension and reduces a thickness of the metal strip (2) to be bonded, coordinately controlling the tension by displacement, the rotation speed and the surface roughness of the friction roller (9);
• S3:
• transporting the metal strip to be bonded (2) heated to a rolling mill (6) for rolling to obtain a metal composite strip, wherein a rotation direction of the friction roller (9) in the step S2 is opposite to a rotation direction of a roller of the rolling mill (6)
• wherein a diameter and surface roughness of the two friction rollers (9) in a same one of the friction roller heating devices (3) are different;
• wherein each of the friction roller heating devices (3) in step S2 comprises two brackets (11), two bearing seats (8) are respectively provided in the two brackets (11), and a first bearing seat of the bearing seats (8) at a lower part is fixedly provided, a second bearing seat of the bearing seats (8) at an upper part is movably provided;
• an upper surface of the second seat of the bearing seats (8) located in the upper part is connected with a pressing down device (10), wherein the pressing down device (10) is installed on the two brackets (11), and the friction rollers (9) are provided in the bearing seats (8) corresponded on the two brackets (11), an end of the friction rollers (9) is connected to an output shaft of a reducer (13) through a cardan shaft (12), and an input shaft of the reducer (13) is connected with an output shaft of a motor (14);
• wherein an included angle between an axial direction of the friction roller (9) in the friction roller heating device (3) and a rolling direction of the metal strip (2) to be bonded is greater than 0° and less than or equal to 90°.