Artillery Shell Case Blasting Machine

Artillery Shell Case Blasting Machine

An artillery shell case blasting machine cleans the internal and external surfaces of artillery shell cases, cartridge cases and similar thin-walled cylindrical workpieces in a single clamping, ahead of painting, coating or reloading. It is a two-process machine: the outer wall is cleaned by wheel blasting, the bore by sandblasting through a blast gun. Loading and unloading are automatic and both surfaces are finished in one cycle. The same equipment is supplied for internal and external cleaning of steel cylinders, acetylene cylinders and oxygen cylinders — workpieces that share the case geometry: a closed or semi-closed body, a narrow bore, and a wall thin enough to distort if it is gripped badly. It is a cleaning machine. It does not resize, anneal or proof-load a case, and it is not a shot peening machine.

How Wheel Blasting and Gun Blasting Work Together

Two processes, and the reason for both.The outer wall runs on wheel blasting: abrasive is thrown by a rotating blast wheel, no compressed air involved, which is why the external pass is fast and cheap per square metre. The bore runs on sandblasting: abrasive is carried by compressed air through a blast gun that enters the case mouth. The two are not interchangeable, and the reason is geometric. A blast wheel throws abrasive in a fan; that fan is what makes it efficient across a flat outer surface and exactly what stops it from reaching the bottom of a narrow cavity. A blast gun can be aimed anywhere the nozzle fits, but it cleans a spot rather than a surface, so running the outside on a gun would be uneconomically slow.

Carrying both is therefore not a feature list item. It is the only way to finish a case inside and out in one cycle. A single-process machine forces a choice: either the bore stays untouched, or the outside is cleaned at a rate that makes the line uncompetitive.

Loading and clamping.Cases enter the blast enclosure on an automatic handling system and are held by a clamp that stays engaged for the whole cycle — loading, blasting, discharge — with no re-fixturing between the outer and inner pass. Re-clamping is where thin-walled parts take damage. Every additional grip is another chance to ovalise a mouth that has to chamber to tolerance, and a case that springs back after release will fail a gauge check even though it looked round in the fixture. The clamping is described as flexible because it is designed to hold the case without point loading on the wall, rather than gripping it at one hard spot and letting the rest of the body carry the deflection.

Abrasive.The two passes do not necessarily run the same abrasive. Wheel blasting works on steel shot or steel grit in the S-330 to G-12 range. A blast gun firing into a narrow bore needs a finer, free-flowing abrasive and a nozzle small enough to enter the mouth — the abrasive that performs best on the outside is frequently too coarse to pass a bore nozzle without bridging. Whether the two passes share one recovery and separation system or run separate hoppers is a configuration decision taken against the case drawing, not a fixed feature.

Dust.Dust is drawn off through an integrated cartridge dust collector sized to the enclosure. Both passes generate dust, and the gun pass generates it deeper inside the machine, so the extraction points are placed for the bore as well as the outer wall rather than only at the wheel.

What the Machine Buys You

One clamping, two surfaces. Inner and outer walls are cleaned without the case leaving the fixture. Handling between two separate operations is what produces the dents that scrap a finished case.

Thin walls held rather than squeezed. Flexible clamping is designed around the failure mode of a thin wall — point loading at the grip. A case clamped this way is not deformed by the fixture before the abrasive ever reaches it.

A bore that is actually cleaned. The gun pass is what separates this machine from an external-only case blaster. External-only cleaning leaves scale, carbon and old primer in the one place a reloaded case cannot tolerate them.

Throughput set by the handling cycle, not by operator pace. Loading, blasting and unloading are automatic, so output repeats shift to shift instead of tracking whoever is standing at the machine.

Abrasive economy. Abrasive is recovered and classified before reuse. On a dedicated case line the cost that matters is abrasive consumed per thousand pieces, not the price of the first charge.

A surface grade you can inspect against. Sa 2½ and Sa 3 to ISO 8501-1, with roughness set by abrasive size. Both are written as acceptance criteria, not as adjectives.