One of the more commonly used precision castings is investment casting, also known as lost wax casting: use suitable investment materials (such as paraffin) to make investment molds; repeat the steps of dipping refractory paint and sprinkling refractory sand on the investment mold, hardening the shell and Dry; then melt the internal investment to obtain a cavity; roast the shell to obtain sufficient strength and burn off the remaining investment material; cast the required metal materials; solidify and cool, and clean the sand after removing the shell. In order to obtain high-precision finished products.
According to product needs or heat treatment, cold processing and surface treatment. For example, sand casting, mass production factories should create conditions to adopt technologically advanced modeling and core-making methods. The old-fashioned shock-type or shock-type molding machine production line is not high enough in productivity, the labor intensity of the workers is large, the noise is large, and it is not suitable for the requirements of mass production, so it should be gradually reformed. For small castings, a boxless high-pressure moulding machine production line with horizontal or vertical parting can be used. The production efficiency of solid moulding is high and the floor space is small. For middle parts, various boxed high-pressure moulding machine production lines and gas can be used. Molding line to meet the requirements of fast, high-precision molding production line, core-making methods can be selected: cold core box, hot core box, shell core and other high-efficiency core-making methods. Medium-volume large castings can consider the application of resin self-setting sand molding and core making.
For heavy castings produced in small batches of a single piece, manual modeling is still an important method. Manual modeling can adapt to various complex requirements and is more flexible, and does not require a lot of process equipment. Water glass sand molds, VRH water glass sand molds, organic ester water glass self-hardening sand molds, clay dry molds, resin self-hardening sand molds and cement sand molds can be used; for single-piece heavy castings, the pit molding method is used for low cost and put into production quick.
Mass production or long-term production of shaped products adopt multi-box modeling and split-box modeling. Although the initial investment in molds and sand boxes is high, it can be compensated by saving modeling man-hours and improving product quality.
Low pressure casting, die casting, centrifugal casting and other casting methods are only suitable for mass production due to the expensive equipment and molds.
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