After placing the clay core, cover the upper cavity of the casting cavity. This process of placing the clay core is called "lowering the core".
The box is closed to form a cast outer surface. When lifting the sand box from the wet mold, pay attention to make the sand box have a small displacement to avoid sand sticking to the flat plate. For covered boxes, attention should be paid to the safety of rummaging and the collapse of sand during rummaging. Pay attention to whether the pin positioning is in place or whether the mark positioning is correct when closing the box, so as to avoid the wrong box.
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Gravity casting: sand casting, hard mold casting. The molten metal is injected into the cavity by the gravity of the metal itself. Pressure casting: low pressure casting, high pressure casting. The molten metal is instantly pressed into the casting cavity by extra pressure.
Mold preparation (container for making liquid metal into solid castings) can be divided into sand mold, metal mold, ceramic mold, clay mold, graphite mold, etc. According to the use times, it can be divided into disposable mold, semi-permanent mold and permanent mold. Mold quality is the main factor affecting the quality of castings;
Melting and pouring of casting metal, casting metal (casting alloy) mainly includes all kinds of cast iron, cast steel and casting non-ferrous metals and alloys; Casting processing and inspection. Casting processing includes removing foreign bodies from the core and casting surface, cutting off risers, shoveling off burrs, overlapping seams and other protrusions, as well as heat treatment, shaping, rust prevention and rough machining.
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