Specialized micro-blast or micro-jet machines are available for applications requiring selective surface preparation, material removal and finishing. Blasting makes the surface suitable for subsequent coating operations such as thermal spraying, painting or plating.
Sand blasting equipments contain several major components.
1. The pressure generator: it uses a crankshaft or plunger pump to increase the pressure of the carrier.
2. Abrasive injectors: they deliver the abrasive from a hopper or tank to either a blasting wheel, or directly to a nozzle, gun, head or lance.
3. Blast cabinets: they hold smaller work pieces, while blast rooms are used for larger ones.
4. The dust collection / filtration system removes fine particles of abrasive, media, and blasting waste from the air.
5. The media separator / declaimer remove undersized abrasive, media, or coarse waste.
The other components are
1.Blast pots.
2.Blast nozzles.
3.Blast hoses.
4.Vacuum blaster
5.filter units
6.Blasters protection
7.Quick blasts stop.
8.blast accessories
There are several important specifications for sandblasters. The media flow is the rate at which the abrasive grain feeds into the system. The blast pressure is the water or air pressure. They are used to create a jet or blast stream for cutting or propelling abrasive particles. The abrasive linear speed is the particle velocity of abrasive grains as first projected from the blast wheel or nozzle.
Some equipment is small enough for portable or handheld use, or can be mounted on a bench, pedestal, cart, hand truck, floor, or skid. Other's are large enough to be put onto a trailer or vehicle that can be driven to the worksite requiring blasting, such as the side of a steel tank, ship's hull, or building wall. Crawler or track mounted units can uniformly clean or roughen a surface.
On large fixed surfaces, operators guide sandblasters across the surface for cutting or cleaning. Smaller surfaces often require work piece loading. For example, parts can be mounted on a conveyor, tumbler, or spinner. They can also be held by hand and be put any where that we want to. CNC controllers and PC interfaces can be used in conjunction with sandblasters to automate and regulate the delivery of the abrasive.
Some machines refine, roughen or clean surfaces while others debur sharp edges, remove flashing, wash parts, or strip unwanted materials such as heat-treat scale. Other machines peen or burnish glass beads, metal shot or other smooth, rounded shaped media. For example, shafts and turbine blades are sometimes peened or shot blasted because peening improves the fatigue strength of metallic materials by imparting a residual compressive stress on the parts.
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