Determination of metal pressure on the rolls during the formation of the relief on flat working areas of curved profiles

Abstract

A complex of experimental and theoretical studies of forming relief on flat sections of corrugated bent profiles in a rolling mill 1-8 × 60-730 mm was performed. For the formation of the figure, special washers were made from steel 45 with subsequent heat treatment to a hardness of 400-450 HV. The main types of drawings knurled taken Christmas tree-type and pyramid-type. Christmas- tree-type knurling is made on a flat working proiles surface 45 mm wide at an angle of 45 ° with dimensions: notch width 0.3 mm, notch depth 0.6-0.7 mm, pitch between them 5 mm. The pyramid-type knurling is performed on a flat working proiles surface 40 mm wide with a surface inclination angle of 45 ° indented pyramids and an indentation depth of 0.5-0.8 mm. It has been established that during the forming of relief on flat working proiles surface, the depth of knurling depends on the size of the gap between the rollers, the elastic deformation of the stand, the thickness and plasticity of the rolled metal. A method for calculating the pressure of the metal on the rolls during knurling on a roll forming mill is proposed, depending on the required indenta-tion depth for various types of knurling. The unit pressure when rolling on a roll forming mill should be taken equal to 4.1 40.2 of the rolled metal. Measured pressure at pyramidal knurling was 88200 N, and when knurling Christmas-tree type 137200 N. The developed technology allows us to make the surface of the bending profiles on the profiled state in one flow. When rolling down bending profiles on profilesignal state, the depth of rotation depends on the size of the gap between the rolls, the elastic deformation of the cage, the thickness and elasticity of the rolling metal. The proposed method of calculation will allow to determine the pressure of the metal on the rollers when rolling on the profilegeal state depending on the required depth of inhibition for different types of rolling. The specific pressure during rolling on the profiled state must be taken to be 4.1 Ϭ0.2 rolled metal.