1. The resin sand mold has good rigidity and high strength in the initial stage of pouring. This makes it possible to utilize the graphitization expansion of cast iron during solidification to effectively eliminate shrinkage cavities and shrinkage defects, and realize the casting of gray cast iron and ductile iron parts with few or no risers.
2. In the production of solid casting, polystyrene foam molds are used, and self-hardening sand molds are used. When the molten metal is poured into the mold, the foam plastic mold is rapidly vaporized and burned under the action of high-density molten metal. The molten metal replaces the position originally occupied by the foam plastic and cools and solidifies into a solid casting with the same shape as the mold.
3. Relatively speaking, lost foam casting has great advantages over traditional sand molds for the production of single or small batches of large molds such as automobile covers and machine tool beds. It not only saves the expensive wooden mold costs, but also is easy to operate, shortens the production cycle, improves production efficiency, and has the advantages of high dimensional accuracy, small processing allowance, and good surface quality.
Large resin sand castings are all made of resin sand and lost foam casting, with a single piece of more than 40 tons and an annual production of about 8,500 tons. Including bed, workbench, column, gantry top, connecting beam. The internationally popular heat treatment process reduces the stress and deformation of the casting to a minimum. Long-term use is more stable. Our factory specializes in large-scale super-long machine processing, milling, planing and boring. For example, a set of 2*8m gantry milling and planing machine bed (the overall length of the bed reaches 16 meters) is divided into two sections during casting, and can be divided into two sections during rough processing, but they can be connected together during fine processing.