Analysis of cutting performance and pressure characteristics of mine water jet cutting machine

Abstract

Mine waterjet cutting machine is mainly used for cutting steel strands in coal mines, and can also be used for cutting anchor rods and clearing rescue channels, etc. It has no cutting sparks, no thermal deformation, smooth and intact cuts, no pollution and sufficient abrasive sources, and is complementary to other cutting technologies. The system adopts premixed abrasive water-jet cutting technology, with the working pressure of 40 MPa, mass fraction of garnet of 20%, and target distance of 3~5 mm. With the case of Φ21.8 mm steel strand, its cutting speed is 45 mm/min and feedrate is 30 m/min. Under the assumed conditions, the pressure change model shows that, to ensure the cutting quality, steel strands should be cut only after the system pressure rises to close to the working pressure after about 100 s. After the system stops operation, its pressure needs to be reduced from the working pressure to the ambient pressure after 23 s.