Raise boring tool

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.

● Raise Boring Tools are essential for safe and efficient shaft construction in mining and underground engineering. ● Key components include the raise boring cutter, raise boring drill pipe, reamer, and drill string connections. ● Tool selection should match rock conditions, shaft depth, diameter, torque demand, and fatigue loading. ● Raise boring drill pipe quality strongly influences load transfer, drilling stability, and service life. ● Correct maintenance and inspection reduce downtime and improve performance consistency.

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