FIELD: machine building.
SUBSTANCE: tool contains casing, cylindrical element for feeding of pneumatic abrasive mixture, discharge jet in the form of convergent-divergent channel with device for axial movement, branch, reciprocal displacements facilities and fixation and swirler for formation of local water curtain around abrasive jet. Discharge jet is installed open coaxial-to cylindrical element from its other end with formation in casing of annular groove. Branch is connected to cavity of annular groove. Swirler is provided for formation of local water curtain around abrasive jet and is installed at the end of cylindrical element. Output cross-section swirler is open to convergent tube of convergent-divergent channel, and input - to mentioned annular groove. Branch is connected to water source. External diametre of cylindrical element is more than dimension of critical section of convergent-divergent channel.
EFFECT: there is provided settlement of products of abrasion in working area.
2 cl, 2 dwg
