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

Abstract

The invention discloses a roll forming method of large and medium-size structural steel hollow disk-shaped forgings, comprising the following steps of: firstly preparing structural steel bar stocks into hollow disk blanks through upsetting, profiling and punching, and then feeding the disk blanks into a rolling mill for rolling; broadening the disk blanks at the speed of 5-12 mm / s under the axial rolling force of 4500 kN-4900 kN within the rolling time of 60s and at the axial feeding speed of 1.5 mm / s; broadening the disk blanks at the speed of 3-10 mm / s under the axial rolling force of 3000 kN-3900 kN and the radial rolling force of 3500 kN-4000 kN within the rolling time of 60s-100s and at the axial feeding speed of 1.2 mm / s; and broadening the disk blanks at the speed of 2-6 mm / s under the axial rolling force of 200 kN-3000 kN and the radial rolling force of 2500 kN-3000 kN within the rolling time of 100-120s and at the axial feeding time of 0.8 mm / s, and then rolling the disk blanks into the hollow disk-shaped forgings under fire. The method is mainly used for rolling the disk-shaped forgings with excellent shapes, sizes, tissues and properties.

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