METHOD TO PRODUCE HEAT EXCHANGER PLATES Russian patent published in 2010 - IPC B21B1/22 

FIELD: process engineering.

SUBSTANCE: invention is intended for fabrication of flat preforms for heat exchangers with preset-shape relief on one side of the plates. Proposed method comprises lengthwise hot drawing in horizontal rollers. Preforms with preset-shape high-quality surface are produced thanks to that one roll has smooth body while another roll has body with trapezoidal-cross section circular grooves made over body length that narrow towards roll axis and have depth equal to sum of minimum reduction width and maximum relative reduction thickness in millimeters and inclination of lateral sides of 1-5° and have anti-adhesion coat applied on body surface. Note here that rolling is performed with strain degree not exceeding 90% of material relative elongation at rolling temperature. First roll peripheral speed exceeds that of second roll by 3…40%.

EFFECT: invention preforms with preset-shape high-quality surface made from high-strength steels.

2 cl, 1 ex