Process for producing cast pieces of spheroidal graphite with high geometrical and dimensional precision and improved mechanical properties

摘要

The manufacturing process uses cast iron containing the following materials (percentage weight in brackets): C (3 - 4); Si (1.7 - 3); Mn (0.1 - 0.7); Ni (0 - 4); Cu (0 - 1.5); Mo (0 - 0.5); residual Mg (0.025 - 0.080), and the remainder iron and impurities, poured in a liquid state at a temperature of 1350 - 1550 degrees C. The cast iron is essentially bainitic, perlitic or ferritic in structure, and moulded blanks made from it have a volume more or less identical to the finished component and are shaped by hot plastic deformation using calibration in containers or closed matrices to avoid any side burrs.