Brass casting is a typical non-ferrous metal casting, and its casting process must have the same features as general non-ferrous casting. However, due to the special nature of the material, the handling of some details will be different. In addition to understanding the processing of brass castings, it is important to understand how the performance of the castings changes.
When processing brass castings, casting temperature control is critical, generally at least 980 degrees Celsius, and this is only for high-zinc brass materials, if it is low-zinc brass casting temperature is even higher. There are three specific casting processes, namely lost wax casting, die casting and sand casting.
When the lost wax casts the brass casting, the molten alloy is injected into the molten alloy through the wax mold, and the desired casting is obtained after being cooled and solidified; and the die casting can reuse a single mold to complete the molding of the brass casting. Although sand casting is old, it is also very common, especially for small foundries.
The specific operation, the first is the mold preparation, to know the quality of the mold preparation is the main factor affecting the quality of brass castings; followed by the casting metal melting and casting; then the casting processing and inspection, including the removal of the core And foreign materials on the casting surface, cutting water rising mouth, shovel polishing burrs and crevices and other projections and heat treatment, shaping, anti-rust treatment and roughing.
The facts prove that the hardness of brass castings can be further increased by corresponding means. For example, adding trace amounts of cobalt to the raw materials can effectively reduce the grain size of the as-cast alloy and change the shape of the crystal grains, thereby increasing the resistance of the alloy. Pull strength, hardness, and ensure that the alloy has good ductility.
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