The Castings
Castings cover the target with a small resin. For ease of grip. And sample preparation steps. If the piece is large, it may not be convenient handle Castings. Such housing is necessary to complete the edges. For example, to maintain the thickness of the coating. Castings and should be cleaned before work to enhance the adhesion between slices proceed with resin. There are 2 types of Castings
Castings hot the
specimen is first compressed with high compression and heat until the resin powder. Curing the specimens in Castings. Such housing is suitable for products that do not change the structure at about 150 C, a temperature at which air Castings work. And a pressure of about 4,000 psi, and how hot it is designed to house a lot. Need high quality of housing The size and shape of the house, of course. Castings and spent a short time in
the evening Forms Castings
Castings is no pressure and heat involved. It uses a liquid resin mixed with a housing made of solid material. Let's place the specimen in the mold upside plane to study. Then pour the resin mixture into the mold. The duration of the erection of about 16-24 hours of Castings are suitable for many types of work. And parts with just one. Most often it is designed to be a very sentimental. And pieces that do not withstand the pressure and heat
to prepare the mechanical
prep work by removing the surface of the skin to the desired quality in a high gloss. Sample preparation procedure is divided into two steps, namely
the planar grinding and polishing of
the polished plane
is the first step to tune out the damaged surface. And to make a smooth, level surface that is possible. By sanding with coarse sandpaper
to shine
after polishing to the plane of the specimen. Must shine with coarse sandpaper to view. The number of paper to be polished in the same direction as the surface. And, when the number of detail sander, turn specimens as shown in Figure 90, then polished until the grinding marks disappear. Do this repeatedly until Paper No. 1200.
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