Roll forming method of hollow disk forgings of large and medium-sized structural steel

Abstract

The invention discloses a method for rolling and forming a hollow disk-shaped forging of large and medium-sized structural steel. Firstly, the structural steel bar is subjected to upsetting, pressing, and punching to form a hollow disk blank, and then the disk blank is put into a rolling machine for rolling. system. Within 60s of rolling, the disk blank is widened at a speed of 5mm / s~12mm / s with an axial feed rate of 1.5mm / s and an axial rolling force of 4500KN~4900KN; within 60s~100s of rolling, With an axial feed rate of 1.2mm / s, under an axial rolling force of 3000KN~3900KN and a radial rolling force of 3500KN~4000KN, the disk blank is widened at a speed of 3mm / s~10mm / s; rolling Within 100s ~ 120s, with the axial feed speed of 0.8mm / s, under the axial rolling force of 2000KN ~ 3000KN and the radial rolling force of 2500KN ~ 3000KN, the disk blank is fed at a speed of 2mm / s ~ 6mm / s Speed ​​widening, one-fire rolling into a hollow disc forging. This method is mainly used for rolling disc-shaped forgings with excellent shape, size, structure and performance.

Description

technical field [0001] The invention relates to a rolling forming method of forgings, in particular to a rolling forming method of large and medium-sized structural steel hollow disk forgings. Background technique [0002] The Chinese invention patent specification CN101020282A published on August 22, 2007 discloses a rolling forming method for large and medium-sized hollow disc-shaped forgings. Hollow disc blanks are formed, and the hollow disc blanks are heated and then installed, positioned, axially rolled and radially-axially rolled to form hollow disc-shaped forgings. This method only solves the technical problem of rolling forming of large and medium-sized hollow disk-shaped forgings. When using this method to roll large and medium-sized structural steel hollow disc forgings, when the upper tapered roller of the rolling mill moves axially towards the disc blank to roll the disc blank, if the feed speed is too high, it will cause the disc blank When the temperature ri...

AI Technical Summary

Problems solved by technology

When using this method to roll large and medium-sized structural steel hollow disc forgings, when the upper tapered roller of the rolling mill moves axially towards the disc blank to roll the disc blank, if the feed speed is too high, it will cause the disc blank When the temperature rises during rolling, it is easy to cause defects such as overheating, overburning, and structural variation; if the feed rate is too small, it will cause the plate to dissipate heat too quickly during rolling, resulting in no rolling, or increased rolling time and rolling times, reduce rolling efficiency, and also cause defects such as insufficient filling of the peripheral part of the ring sharp corner near the outer ring surface of the disk forging

And when adopting this method to roll disc-shaped forgings, it is necessary to make the shape and size of disc-shaped forgings reach the requirements through repeated multi-turn rolling, which not only increases production costs, reduces productivity, but also repeatedly rolls for many times. Process and quality control add difficulty