Double Disc Metallographic Pre-Grinding Machine with Speed 450rpm
Water Cooling
Brief Introduction:
iqualitrol MP-2 is suitable for pre-grinding, grinding and
polishing metallographic specimens. Since the machine is
speed-adjusted by a transducer, it can run 450rpm and 600rpm ,
which favors the machine with wide applications.
The machine is equipped with cooling system which can cool down the
specimen during rough grinding so as to prevent overheating and
avoid damage the metallographic structure .
Featuring easy operation and reliable performance, it is an
indispensable device for the factories, research institutions and
college labs to prepare metallographic specimen.
Technical Specifications:
| Model | MP-2 |
| Grinding/polishing disc diameter | φ203mm/203mm |
| Rotate speed: | 450rpm/600rpm |
| Power Supply | AC220V/50Hz/1Ph |
| Grinding/Polishing disc quantity | 2 |
| Motor Power Consumption | 370W |
| Dimension | 700mm x610mm x280mm |
| Net weight | 45kg |
Surface layers damaged by cutting must be removed by grinding.
Mounted specimens are ground with rotating discs of abrasive paper,
for example wet silicon carbide paper.
The coarseness of the paper is indicated by a number: the number of
grains of silicon carbide per square inch. So, for example, 180
grit paper is coarser than 1200 grit.
The grinding procedure involves several stages, using a finer paper
(higher number) each time. Each grinding stage removes the
scratches from the previous coarser paper.
This can be easily achieved by orienting the specimen perpendicular
to the previous scratches. Between each grade the specimen is
washed thoroughly with soapy water to prevent contamination from
coarser grit present on the specimen surface. Typically, the finest
grade of paper used is the 1200, and once the only scratches left
on the specimen are from this grade.
The series of photos below shows the progression of the specimen
when ground with progressively finer paper.
Polishing discs are covered with soft cloth impregnated with
abrasive diamond particles and an oily lubricant or water
lubricant.
Particles of two different grades are used: a coarser polish -
typically with diamond particles 6 microns in diameter which should
remove the scratches produced from the finest grinding stage,
and a finer polish – typically with diamond particles 1 micron in
diameter, to produce a smooth surface.
Before using a finer polishing wheel the specimen should be washed
thoroughly with warm soapy water followed by alcohol to prevent
contamination of the disc. The drying can be made quicker using a
hot air drier.
Mechanical polishing will always leave a layer of disturbed
material on the surface of the specimen. Electropolishing or
chemical polishing can be used to remove this, leaving an
undisturbed surface.
