Cold rolling technical standards for galvanized H-beams, operation of production process

Cold-rolling methods and technical standards for galvanized H-section steel, the galvanized H-section steel manufacturer believes that when manufacturing large and medium-sized H-beams, it is necessary to fully prepare from the following several aspects and control various influencing factors during the production process.

Pressing quantity distribution is crucial. The feed beam end of the BD extrusion press should be as thin as possible, which not only reduces the deformation of the beam end and flange during cold rolling but also facilitates the qualification of the flange specifications for the head and tail sections of the rolled piece.

At the front stage of the extruder, thinning the end of the beam is performed, with higher cold rolling force required, and the stand rolls are pressed down relatively; at the middle stage, both horizontal and stand rolls are used for uniform cold rolling; in the last two stages, a slight downward pressure is applied to the end of the beam with lower cold rolling force, ensuring that the tensile strength of the flange exceeds the beam end and the tensile stress at the beam end.

The temperature reduction manipulation of end beam can be approached from two aspects: cold rolling and refrigeration. The geometric specifications of the rolled pieces should be controlled based on the positive error of the end beam thickness and the negative error of the flange thickness for cold rolling. Additionally, the end beam has different amounts of compression at two main and secondary passes, allowing it to generate deformation heat to compensate for the temperature drop.