Raise boring tool

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.

IntroductionRaise boring machines are among the key pieces of equipment used for mining in underground mines. As the core component of the machine, the drill pipe is subjected to significant pressure and friction, and is frequently eroded by dust and water during operation. The failure of drill pipe