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Blast Cleaning and Finishing System : |
| Abrasive
Blasting as a finishing process has been successfully utilized
on metal, glass, ceramics, plastic and stone. Purpose includes
deburring, descaling, peening, polishing, stress relieving, deflashing & cleaning. |
| ABOUT
ABRASIVE BLASTING |
The
Process
It entails forceful direction of abrasive particles-dry or suspended in a liquid
against the surface of matal part or product, to remove contaminants or to impart
desired finish. The process is also called sand blasting, grit blasting, shot
blasting or liquid honing etc. |
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Abrasives
used
Chilled iron grit, Steel shot, Aluminium oxide, Silicon carbide, Glass beads,
Walnut shell, Plastic grit, Saw dust are used as blasting media. Selection depends
upon type of surface, contamination to be removed, type of finish needed & required
production. |
Nature
of Finish obtained
It is most important to recognise that blasting always produces
a "non-directional" (isotropic)
matte surface as opposed to a directional surface imparted
by conventional polishing methods utilizing wheels or belts.
Blasted surfaces are never highly light reflective, but are
of satin, matte and non glaring. Still there is no relationship
between reflectivity and smoothness. A dl appearing blasted
finish can be smoother than a bright or polished finish.
100
magnification micro photograph shows blasted surface (top)
as opposed to polished surface (bottom). |
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What
is a Blast Cabinet?
Blast Cabinet is an enclosure which houses the abrasive propelling mechanism
(blat gun), jolds work in position and confines flying abrasive particles and
dust. |
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| METHODS
OF ABRASIVE BALSTING |
What
are Super Blaster (SB), Pressure Blaster (PB) and Wet Blaster
(WB) machines ?
There are basically three established methods of abrasive blasting i.e. INDUCTION-SUCTION
(SUPPER BLASTER), DIRECTOR PRESSURE (PRESSURE BLASTER) and SLURRY PUMPING (WET
BLASTER). These are briefly described below : |
Induction
- Suction
In this method, abrasive is drawn from hopper into the blast gun by a partial
vacuum created by high velocity airflow. This is useful for light-weight abrasive
and cleaning of light corrossion. |
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Direct
Pressure
In this method, abrasive is pressurised in a pressure vessel by compressed air
and then for nozzle. It imparts high abrasive velocity and blasting is faster. |
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Slurry
Pumping
In this method, pump draws fine abrasive mixed in water (slurry) from bottom
of hopper and forces it to blast gun where compressed air is introduced to atomise
the slurry. Slurry is impacted on the surface to be cleaned. |
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| Selection
of Abrasives |
| In blasting
operaion, the abrasive used will substantially affect the result
and cost of your operation. We offer all types of abrasives and
dependable advice for right selection to obtain best results at
low cost. Some of the abrasives are : |
Aluminium
Oxide
Brown & While types, low breakdown rate & highly effective cutting action.
Suitable to treat castings, metals and where discolorations is to be avoided. |
Glass
Beads
Unique abrasive for cleaning, finishing and shot peening. It is chemically inert,
good for shot peening & for glaring/shine finish. Does not abrade the surface
and keeps job tolerances intact. |
Iron
Grit & Shot
Chilled iron angular grit & round shots are used extensively for removal
of heavy scale and rust. It is a low cost abrasive with lowest brekdown rate.
Suitable for surface preparation before recoating or painting. |
Walnut
Shell
Used for cleaning delicate surfaces and deflashing of plastic parts. It is cheap
and economical in use. |
Plastic
Grit
Plastic granular particles particularly acrylic and urea are most suitable for
stripping surface coatings while maintaining substrate integrity and dimensional
tolerances intact. |
| Cabinet
Specification |
| MODEL |
PRESSURE BLASTER (PB) |
SUPER BLASTER (SB) |
WET BLASTER (WB) |
| |
KVP
91/82 |
KVC
120/90 |
KVC
150/120 |
KVS
60/60 |
KVS
91/82 |
KVS
120/90 |
KVW
91/82 |
KVW
120/90 |
| Overall Dimension mm |
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| Height |
2130 |
2030 |
2080 |
1660 |
2120 |
2570 |
1940 |
2235 |
| Width |
1100 |
1365 |
1665 |
800 |
1070 |
1365 |
1070 |
1365 |
| Depth |
2500 |
2430 |
2730 |
1500 |
1400 |
1700 |
1500 |
1700 |
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