Roll forming method of large and medium-sized aluminum alloy hollow disc forgings

Abstract

The invention discloses a rolling forming method of a large and medium-sized aluminum alloy hollow disc forging. Firstly, the aluminum alloy bar is subjected to upsetting, pressing and punching to form a hollow disc blank, and then the disc blank is put into a rolling machine for rolling. system. Within 20s of rolling, the disk blank is widened at a speed of 9mm / s~12mm / s at an axial feed rate of 1.9mm / s and an axial rolling force of 4000KN~4900KN; within 20s~40s of rolling, The disc blank is widened at a speed of 8mm / s to 10mm / s at an axial feed rate of 0.9mm / s, an axial rolling force of 3000KN~3500KN and a radial rolling force of 3000KN~4000KN; rolling Within 40s ~ 70s, with the axial feed speed of 0.5mm / s, under the axial rolling force of 2500KN ~ 3000KN and the radial rolling force of 2000KN ~ 3000KN, the disk blank is fed at a speed of 5mm / s ~ 8mm / 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 a forging, in particular to a rolling forming method of a large and medium-sized aluminum alloy hollow disc forging. 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 aluminum alloy 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 rise...

AI Technical Summary

Problems solved by technology

When using this method to roll large and medium-sized aluminum alloy 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