Cast Aluminium Plaques
Working closely alongside our local foundry manufacturer, we are now able to offer cast aluminium plaques. This is particularly exciting news for us, as it means we can manufacture items which are normally too large using our traditional stamping and lost wax techniques.
Sand casting is a method where compacted grains of sand are used as the mold material. It is one of the oldest and most widely used metal casting skills. Listed below are some of the key steps in the production method for the Scooby Clinic cast aluminium plaques we recently manufactured.
A pattern is made based on the desired design. A bottom mold is filled with compacted sand and the pattern is pressed into the sand. The top mold is then aligned and placed on to the bottom mold. More sand is added to the top mold and compacted until almost solid. The top mold is then carefully lifted and the pattern removed, leaving a vacuum in the the sand. The top mold is then re-aligned again to the bottom, and molten metal (in this case aluminium) is poured into the vacuum and allowed to cool. Once cooled, the top and bottom molds are separated to leave the aluminium casting.
Once the aluminium castings have been made, they are fettled to remove any blemishes/grains of sand sometimes caused by the molds and start to look more like a finished item. For these particular plaques, black enamel was then filled into the recessed areas of the castings and left to cure/dry overnight.
Leaving the castings overnight, gave the enamel enough time to dry. We then polished the surface of each casting which also removed any enamel that had accidentally spilled over onto the raised areas. This left the plaques with a smooth and shiny surface, giving them a nice contrast to the black enamelled areas. Finally we sprayed each plaque with clear lacquer to protect the plaques and give them a high gloss finish.