Custom Internal Shot Blasting Machine Factory & Manufacturer

Lance deflection over long strokes (e.g., 12m to 18m) is a major cause of blast asymmetry. We combat this using two patented configurations: (1) For rotating workpieces, we utilize high-modulus carbon-fiber sleeved lances or pre-stressed steel truss supports equipped with non-marking polyurethane radial roller guide stabilizers that self-center within the tube bore. (2) For non-rotating large pipes, we deploy self-propelled motorized crawlers (internal blast tractors) that ride along the pipe invert with 360-degree rotary heads, completely eliminating cantilever bending moments.

Static tungsten carbide or boron carbide deflection cones deflect an axial blast stream into a 360-degree radial ring. While cost-effective and compact for small bores (Ø15mm–Ø80mm), they experience high impact wear and deliver lower kinetic impact velocity. In contrast, pneumatically or servo-driven rotary blast heads rotate two or four opposing venturi nozzles perpendicular to the tube wall at 30 to 120 RPM. This concentrates maximum kinetic energy onto the metal substrate, enabling higher throughput and clean surface profiles on difficult mill scale and heavy oxide layers.

For blind-ended tubulars and gas cylinders, gravity ejection is impossible. We design dual-channel concentric lances where blast air and abrasive enter through the center tube, while an integrated annular outer vacuum sleeve or reverse high-vacuum suction line draws spent media and broken debris out continuously during the blast cycle. Following the blast pass, a high-pressure air purge cycle blows out residual trapped particles while the workpiece is tilted at a 15–30 degree decline, leaving zero grit inside the component.

Yes. Our internal peening systems for aerospace landing gears, rotor masts, and APU drive shafts are engineered to meet AMS 2430 and AMS 2432 (computer-monitored peening). The machine continuously logs blast air pressure within ±0.1 bar, shot flow rate via closed-loop MagnaValves within ±5%, workpiece spindle rotational speed, and CNC lance axial traversal rate. A specialized internal Almen fixture maps saturation curves prior to production runs, producing full digital traceability for Nadcap accreditation.

Air demand depends on the blast nozzle throat diameter and operational pressure. A standard dual-nozzle #7 (11.0mm venturi) internal rotary blast head operating at 7.0 bar (100 psi) consumes approximately 14.8 m³/min (520 CFM) of clean, dry compressed air. For high-throughput industrial pipe plants running quad-lance simultaneous lines, we engineer centralized air receiver buffers and integrated refrigerant air dryers delivering 45 to 60 m³/min with pressure dew points below +3°C to prevent media agglomeration.