Rod Shot Blasting Machine (Round Bar & Wire Rod Descaling Machine)

The Rod Shot Blasting Machine manufactured by Finishree Equipment’s Pvt. Ltd. is an advanced, high-speed, continuous through-feed surface preparation system engineered specifically for descaling, rust removal, oxide layer stripping, and mechanical surface etching of solid cylindrical metal rods. This includes carbon steel rods, alloy steel rounds, stainless steel rods, high-tensile wire rods, reinforcement rebars, peeled rods, and automotive suspension rods.

Equipped with a precision motorized skew roller conveyor (diabolo conical rollers), the machine imparts simultaneous forward linear traverse and continuous axial rotation to the rods as they advance through a heavy-duty manganese-lined blast chamber. High-efficiency centrifugal blast wheels launch steel abrasive media at velocities up to 80 m/s across the entire circumference, achieving 100% uniform 360-degree surface cleanliness compliant with SA 2.5 and SA 3.0 (ISO 8501-1) standards with zero shadowing or surface deformation.

Working Principle & Operational Process

The rod shot blasting process is completely automated and operates on a continuous through-feed cycle designed for high tonnage daily throughput:

1. Automated Infeed & Skew Roller Conveyance: Solid rods are placed onto the infeed storage rack and transferred to the motorized skew roller conveyor table. The precision angled conical diabolo rollers drive each rod forward while continuously rotating it along its longitudinal axis. Conveyor speed is controlled through a Variable Frequency Drive (VFD), allowing variable line speeds from 2 to 15 meters per minute depending on the initial scale thickness.

2. Multi-Angle High-Velocity Blasting: As the rotating rod enters the central blast cabinet, high-power centrifugal blast wheels strategically mounted at calibrated oblique angles fire high-velocity cast steel shots (S230/S280/S330) or fine steel grit. The high kinetic energy of the abrasive stream pulverizes mill scale, rolling oxides, corrosion, and drawing residues in seconds.

3. Heavy-Duty Manganese Armor Enclosure: The blast zone is fully protected with replaceable high-manganese alloy cast liners (Mn13) to ensure decades of structural integrity under abrasive wear. Entrance and exit vestibules are fitted with multi-layer heavy-duty hanging rubber curtains that effectively contain flying media while allowing seamless continuous rod passage.

4. Automatic Media Recovery & Air-Wash Separation: Spent abrasive, detached mill scale, and fine dust drop through floor grates into the hopper screw conveyor, which feeds a heavy-duty vertical bucket elevator. The elevator discharges media into a rotary screen and Air-Wash Separator, where usable abrasives are aerodynamically separated from broken fines and dust, returning clean media to the active blast hopper.

5. Reverse Pulse-Jet Dust Extraction: An industrial negative-pressure pulse-jet cartridge dust collector continuously extracts airborne dust from the blast cabinet and separator, maintaining dust emission levels below 10 mg/Nm³ for environmental compliance and shop-floor safety.

6. High-Pressure Air Blow-Off & Clean Discharge: High-velocity air blow-off nozzles purge any residual abrasive media from the rod surface before exiting onto the pneumatic discharge collection rack, delivering pristine, stress-relieved, clean rods ready for cold drawing, peeling, threading, or anti-corrosion coating.

Key Machine Features

• High-Throughput Continuous Operation: Through-feed skew diabolo conveyor enables continuous line speeds up to 15 m/min for maximum production efficiency.
• Uniform 360-Degree Cleanliness: Continuous axial rotation guarantees complete surface cleaning without unblasted flat spots or shadowing.
• Beneficial Shot Peening Effect: Shot impact induces compressive residual stresses on the rod surface, significantly enhancing fatigue life and tensile strength.
• Acid Pickling Replacement: 100% mechanical dry cleaning process eliminates hazardous chemical acid pickling, effluent treatment costs, and hydrogen embrittlement.
• Wide Diameter Processing Range: Handles solid rods from Ø6 mm up to Ø150 mm with fast adjustments between batches.
• Long-Life Mn13 Wear Protection: Blast chamber armored with replaceable high-manganese cast plates for minimal maintenance downtime.
• Closed-Circuit Abrasive Recycling: Automatic screening and multi-stage air-wash separation ensure minimal media consumption and prolonged blade life.
• Integrated PLC Safety Control: IP55 centralized electrical panel with touch HMI, digital speed displays, interlocks, and emergency stops.

Industrial Applications

• Cold Drawing & Wire Rod Processing: Descaling raw hot-rolled wire rods and carbon steel rods prior to continuous wire drawing or cold extrusion.
• Automotive Steering & Suspension: Surface cleaning and peening of steering rods, torsion bars, tie rods, stabilizer rods, and drive shafts.
• Fastener & Cold Heading Industry: Oxide and scale removal on alloy steel round bars prior to forging bolts, studs, and heavy-duty fasteners.
• Reinforcement Steel & Rebar (TMT): Descaling high-yield rebar and prestressed concrete steel bars for enhanced bonding with concrete.
• Hydraulic Cylinder Piston Rods: Anchor profiling and etching of precision ground rods prior to hard chrome electroplating.
• Stainless Steel Rod Conditioning: Oxide removal and uniform satin finishing of Austenitic and Martensitic stainless steel round bars.