Custom Abrasive Blast Cleaning Machine Factory & Companies

Abrasive blast cleaning is primarily an abrasive, subtractive process engineered to clean, descale, or generate a specific micro-roughness profile ($Ra/Rz$) for mechanical interlocking prior to coating, welding, or bonding. Sharp angular media (e.g., aluminum oxide, chilled iron grit) is frequently utilized. Shot peening, conversely, is a cold-working metallurgical process using spherical, conditioned media (cast steel shot, ceramic beads, cut wire) that impacts the surface elastically/plastically without material removal. Its goal is to induce deep residual compressive stress layers, which counteracts operational tensile stresses and extends fatigue life, stress corrosion cracking resistance, and fretting tolerance.

Suction blast systems operate on the venturi principle where compressed air moving through a gun body creates a vacuum that pulls abrasive from an unpressurized hopper. This is suitable for lighter-duty profiling, localized deburring, and continuous operations with lower airflow demands. Direct pressure systems place the entire abrasive reservoir under pressure; when the blast valve opens, media is forced into the airstream under full system pressure. Direct pressure delivers 3 to 4 times the impact energy and particle velocity of suction systems at the same PSI, making it essential for heavy descaling, deep profiles, rapid cycle times, and structural shot peening.

Nadcap checklist AC7117 (and sub-tiers such as AC7117/2 for automated peening) requires documented proof of process control. KOSHIN machines provide the necessary prerequisites: automatic parameter interlocks (machine halts if blast pressure or media flow rate drifts beyond ±10%), digital data-logging of part ID, cycle time, target intensity, and turntable speed, annual sensor calibration records traceable to national standards, and Almen strip saturation curve software matching SAE J443 standards.

Blasting titanium or nickel-based superalloys with media previously used on carbon steel can embed ferrous debris, triggering galvanic corrosion and micro-cracking during heat treat. KOSHIN addresses this by building custom machines with polyurethane or manganese-lined blast cabinets, integrated dual/triple media hoppers with automated clean-out cycles, or configuring dedicated, isolated blasting chambers within a single robotic cell.

Nozzle orifice diameter (e.g., No. 5 at 5/16" [8.0 mm] vs. No. 7 at 7/16" [11.0 mm]), blast pressure target (e.g., 6 bar / 90 psi), and the number of active blast nozzles determine total CFM (Cubic Feet per Minute) or $m^3/min$ air demand. For example, a single #6 (3/8" / 9.5 mm) venturi nozzle blasting at 90 psi consumes approximately 220 CFM (6.2 $m^3/min$). Sizing a system also requires factoring a 25% safety reserve for compressor duty cycle and nozzle wear expansion over time.