METHOD OF MANUFACTURING ROOFS OF CLOSE CONSTRUCTION Russian patent published in 2017 - IPC D07B3/00 

FIELD: metallurgy.

SUBSTANCE: method of making ropes of a closed structure is as follows. The steel core 1 is made in one technological operation with a linear contact of the wires both over the layers and in the layer itself. All layers of the core are made with the same pitch of the web, in one direction with simultaneous deformation with a reduction ratio of the cross-sectional area of the core 8÷12%. On top of the steel core are coils of shaped wires 2 and 3 of different profile and section. Subsequent extraction of the rope with a fixed load, by applying a load in the range (0.35÷0.55) P, where P - aggregate breaking force of a rope, endurance of loading and the subsequent unloading. The cycle is repeated one to five times. Such a drawing mode allows to stabilise the elastoplastic properties, to remove the residual structural elongation.

EFFECT: improving the quality of the rope of a closed structure, increasing the service life, increasing the efficiency when commissioning.

1 dwg