SHOT BLASTING
MACHINE (AIRLESS).
Metaflux Spray Solutions manufactures airless shot blasting machines in Pimpri-Chinchwad, Pune, for descaling and surface preparation of steel castings, forgings and fabrications before coating.
Direct drive turbine wheels throw steel shot at the component instead of blowing it with compressed air, so running cost per square metre stays low. Batch, table and hanger models strip mill scale, sand and rust to SA 2.5. Ask for the price and cycle time on your part.
MACHINE MODELS.
Built for high volume descaling of structural steel, foundry castings, forgings and fabricated weldments across India and the Middle East.
Batch Type Shot Blasting Machine
"Built for small-to-medium castings and forgings in repeat batches. The airwash separator keeps re-circulated abrasive clean, so the profile stays consistent from the first part to the last."
Hanger Type Shot Blasting Machine
"For complex three-dimensional weldments that cannot tumble. Parts hang on an overhead rail and rotate between synchronised wheels for even coverage on every face."
TYPICAL SPECIFICATIONS.
Wheel count, motor rating and cycle time are chosen against your part weight, scale condition and parts-per-shift target. Send us a drawing and we will quote the machine and the running cost together.
| Parameter | Typical Range |
|---|---|
| Batch / hanger load capacity | 100 kg to 800 kg per batch, up to 3,000 kg on hanger models |
| Table diameter / drum volume | Table 900 to 2,000 mm dia; tumblast drum 100 to 600 litres |
| Number of blast wheels | 1 to 4 direct drive turbines |
| Wheel motor rating | 5.5 kW, 7.5 kW, 11 kW or 15 kW per wheel |
| Wheel speed | 2,200 to 3,000 RPM, variable via VFD |
| Abrasive throughput | 120 to 400 kg per minute per wheel |
| Typical cycle time | 3 to 12 minutes, depending on scale thickness and part geometry |
| Abrasive media | Steel shot S-110 to S-460, steel grit G-18 to G-50, chilled iron grit |
| Dust collector airflow | 1,500 to 6,000 CFM, pulse jet cartridge type |
| Cabinet liner | 12 mm manganese steel or bolted Hi-Cr cast liners |
| Achievable cleanliness | SA 2.5 (ISO 8501-1), profile 40 to 90 microns Rz |
Indicative ranges across the standard build. Exact specifications vary by configuration and are confirmed on the approved general arrangement drawing for your order.
Frequently Asked Questions.
Direct answers on airless shot blasting machines, abrasive media and achievable surface cleanliness.
What is the difference between shot blasting and sand blasting?
Shot blasting throws abrasive mechanically from a spinning centrifugal turbine wheel, while sand blasting propels abrasive with compressed air through a nozzle. Shot blasting moves far more abrasive per minute — 120 to 400 kg per minute per wheel — which makes it the economic choice for repeat batches of steel components. Air blasting is slower but reaches complex geometry, works on site and can run fine media at low pressure. Metaflux Spray Solutions manufactures both types in Pune.
Does a shot blasting machine need an air compressor?
An airless shot blasting machine does not need a compressor for the blast itself, because the turbine wheels are driven by electric motors of 5.5 kW to 15 kW each. Compressed air is only required for pulse-jet cleaning of the dust collector cartridges and for pneumatic controls, which is a small fraction of what an equivalent air blasting installation would consume. That difference in energy per square metre cleaned is the main reason high-volume steel plants specify airless machines.
What abrasive media is used in a shot blasting machine?
Airless shot blasting machines run steel shot from S-110 to S-460, steel grit from G-18 to G-50, or chilled iron grit. Round steel shot peens and cleans the surface and leaves a smoother, rounded finish; angular steel or chilled iron grit cuts a sharp anchor profile and is the correct choice when a coating has to bond afterwards. The media is recirculated through an airwash separator that screens out fines and broken particles so the profile stays consistent from the first part in the batch to the last.
What surface cleanliness does a shot blasting machine achieve?
Metaflux shot blasting machines are built to reach SA 2.5 to ISO 8501-1 with a surface profile of roughly 40 to 90 microns Rz. That is the cleanliness normally specified before painting, galvanising or thermal spray coating. The result depends on media selection, wheel speed and exposure time, so cycle time is set against the scale condition of the actual component rather than assumed.
How long is a shot blasting cycle?
A typical shot blasting cycle runs 3 to 12 minutes depending on scale thickness, part geometry and the number of wheels fitted. Heavily scaled hot-rolled steel at the long end of that range; lightly rusted fabrications at the short end. Metaflux Spray Solutions sizes wheel count, motor rating and cycle time against the part weight and the parts-per-shift target before quoting.
MEDIA
AND WEAR PARTS.
Media
"Steel shot S-110 to S-460 and grit G-18 to G-50, matched to the profile you need."
Blast Wheels
"Direct drive turbines with bolt-out blades, changed without pulling the motor."
Liners
"12 mm manganese steel cabinet liners, replaceable panel by panel."