1.The mainstream materials for forged steel cold rolling rolls include Cr2, Cr3, Cr5, Cr6, semi-high-speed steel and high-speed steel grades. 2.Forged steel cold rolling rolls are mainly applied as work rolls and intermediate rolls for various continuous cold rolling mills and single-stand cold rolling mills for ferrous metals; work rolls for cold and hot skin pass mills; work rolls and backup rolls for small-sized cold rolling mills; and cold rolling work rolls and backup rolls for non-ferrous metal rolling mills. 3.Forged steel cold rolling rolls adopt a three-stage smelting process consisting of electric furnace melting, vacuum refining and electroslag remelting (ESR). Combined with forging, multiple heat treatments, cryogenic treatment and machining processes.
Roller cutters for raise boring machines serve as the core rock-breaking tools for raise boring construction in underground engineering, and their performance directly governs drilling efficiency, construction cost and project quality. This paper systematically elaborates on the technical principles, classification, structural features and key technologies of raise boring disc cutters, analyzes the innovative progress of core technologies including cutter mounting positioning, bearing sealing and insert profile design, and prospects the future technical development trends of such cutters.
The ultra-wide square plate forging for shield cutter heads features a special structure characterized by large width and small thickness. The ultra-wide thin-plate cutter head square plate forging manufactured this time, with dimensions of 5750 mm × 5750 mm × 380 mm, belongs to the field of extreme manufacturing. It presents extremely high difficulty in width expansion and imposes stricter requirements on grain size and molten steel purity control. The traditional process route of "upsetting and drawing + wide-anvil flat drawing + 90° rotary drawing" is very difficult to control. Through process innovation, a new process scheme of "dimension-controlled preforming + rotary anvil-feeding width-expansion drawing + four-side flattening" is proposed. By strengthening the control over smelting and heat treatment processes, the production trial has been successfully completed.
