APPROACH GUIDE UNIT FOR SQUARE BILLET IN HOT PIERCING PLANT

摘要

PURPOSE:To make possible the approach of the square billet to be stably guided, by arranging the stationary guide for bearing the adjoining two planes of the square billet and the flexible, movable guide for bearing other two planes, in the approach guide for the square billet. CONSTITUTION:The stationary guides 13, are attached to the frame 12 of L-type section in order to bear the bottom plane lowering its temperature faster than other planes, and to bear one side plane; the movable guides 16, are attached to the frame 14 of L-type section through the coil spring 15, for bearing other two planes keeping higher temperatures than other planes. The center of the billet 1 displaces from A-B owing to the pressure of the press machine. The center of the piercing plug is located so as to point A; however, the piercing plug pierces the billet moving toward the interior of the billet being held at higher temperatures and showing less resistance force; hereby, the eccentricity of thus prepared hollow blank pipe becomes small. And then, the square billet 1 with enlarged sectional area is smoothly guided into the hot piercing plant.