The product model that needs Dalian casting parts is made of paraffin or foam, and the surface is coated with refractory coating. The model is buried in the column yarn, and then the molten metal liquid is poured into the model, so that the paraffin or foam in the model is vaporized and melted metal occupies the position of the model. After condensation, the refractory material on the surface is removed, and the casting products can be obtained. Vanishing film castings have the advantages of high precision, short processing time, cleanliness and pollution-free, and are mainly used for manufacturing precision castings such as engine box bends.
Precision casting, especially precision casting using induction melting equipment, typically uses some type of non-contact infrared radiation thermal resistance or pyrometer as the primary or secondary method for metal temperature detection. People who use traditional pyrometers may not be aware of the potential sources of deviation in their measurements and simply focus on the technical conditions of the instrument's "accuracy", thus often being misled. These precise technical conditions are only ideal targets in laboratory environments.
What types of castings are available in Dalian
Castings can be divided into ordinary sand castings, metal castings, die castings, centrifugal castings, connecting castings, investment castings, ceramic castings, electroslag remelting castings, bimetallic castings, etc. Among them, ordinary sand castings are widely used, accounting for about 80% of the total production of castings. However, most non-ferrous metal castings such as aluminum, magnesium, and zinc are die castings. The quality of castings has a significant impact on the performance of mechanical products.
When the thin-walled part of the automotive casting releases solid phase transformation, the thick walled part is already in an elastic state. If the volume of the new phase is greater than that of the old phase, the thick walled part will be elastically stretched to form tensile stress, while the thin walled part will be elastically compressed to form temporary compression. At this point, the symbol of phase change stress is the same as that of thermal stress, that is, stress superposition. When the automotive casting continues to cool until phase transformation occurs in the thick walled part, the specific volume increases and swells, causing the phase transformation stress formed by the previous part to disappear.
Precision casting is a general term for obtaining precision size castings. Compared with traditional sand casting processes, precision casting produces more accurate casting dimensions and better surface finish. Including: investment casting, ceramic mold casting, metal mold casting, pressure mold casting, and lost foam casting. Precision casting is also known as wax loss casting. The product is complex and approaches the shape required by the parts. It can be used directly without the need for processing or minimal processing. This is an advanced technology that is almost mesh like.
