Cast steel parts, as the name suggests, are components made by pouring molten steel. Compared to ordinary cast iron parts, cast steel parts have better strength and ductility. However, casting manufacturers often encounter various challenges during the production of cast steel parts. How should they respond?
Ductile iron is one of our more common materials, because of the good characteristics of ductile iron, so it is generally used in the production of parts with complex stress, strength, toughness and wear resistance, etc., some tractors, internal combustion engines The crankshaft and camshaft of these machines, as well as the medium pressure gate valve in the general machinery are cast with ductile iron, so when the ductile iron is cast, what does its fluidity and pouring process look like?
Due to its relatively high carbon and silicon content, ductile iron, like gray cast iron, exhibits excellent fluidity and self-feeding capacity. However, differences in ladle treatment processes and solidification processes lead to significant disparities in casting properties between ductile iron and gray cast iron, resulting in distinct casting processes for the two materials.
Gray iron castings use lost foam and resin sand casting processes, equipped with large gas tempering kilns, manual aging, and quenching to release internal stress, thereby improving the accuracy of the castings after processing. During the finishing process of the bed body, the machine tool experiences heating of the spindle due to prolonged cutting, which causes thermal deformation and affects the ultimate processing accuracy. For high-precision machine tools and large machine tools, processing errors caused by thermal deformation account for about 40-70%. Since thermal deformation can only be improved and cannot be eliminated, under the condition of a fixed machine tool, it is generally only possible to stabilize the machine tool temperature by controlling the cutting conditions, thus avoiding the impact of temperature changes on processing accuracy. The measures to control temperature changes during the processing of the bed body mainly include:
Currently, China’s exports of precision casting molds are primarily concentrated in Europe, North America, Japan, and South Korea, and for many companies, the export volume of molds accounts for over 30% of their total production value. From the perspective of our country's macroeconomic policies, market development, and both international and domestic demand, the market for large and medium-sized complex precision casting molds and die-cast parts is extremely vast. Considering our country’s macroeconomic policies and market development, the sales market for large and medium-sized complex precision casting molds and die-cast parts, both internationally and domestically, remains very large.
Ductile iron castings are widely used as a casting material due to their good mechanical properties and corrosion resistance, finding applications in mechanical manufacturing, the automotive industry, aerospace, and other fields. Selecting the appropriate processing technology for ductile iron castings is critical to ensuring their quality and efficiency.
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