Precision casting, literally meaning its process, compared with sand mold casting, no matter on dimension or surface, will be much better. Nowadays, precision casting usually includes Investment casting (Lost Wax), Ceramic mold, and Plaster Mold. Currently lost wax is the most adopted process in precision casting because of its advantages on higher dimension accuracy, automatic mass production, and almost any metal. The process is to make a wax pattern, covered with layers of zircon sand with preset gate and runners, then wait for layers to dry. Heat up to melt the wax to make an empty shell. Pour metal melting into the shell. After cooling, remove the shell and retrieve the casting. From ancient Chinese bronze castings, we know that lost wax process was employed thousands of years ago.
Followings are the benefits of Lost Wax Process
- Thin Wall casting with thickness to 0.5mm
- Accurate dimension, +/- 0.5 - 1.0%, and smooth surface, roughness 2 - 20 μ.
- Complex casting or difficult cutting metal: Save machining time
- Precious metal parts
- Net shape parts
- Apply to almost metal, such as: cast iron, cast steel, ally steel, stainless steel, super alloy, nickel based alloy, cobalt based alloy, titanium alloy, copper alloy, aluminum alloy, etc.
- Cast different parts into one piece to save weight, improve mechanical performance and dimension accuracy, and also lower the machining time and operating cost.