Ductile cast iron as well as ductile cast iron piston and casting process thereof

Abstract

The invention discloses a ductile cast iron as well as a ductile cast iron piston and a casting process thereof. The ductile cast iron comprises the following components in percentage by weight: 3.50-3.60 percent of C, 1.90-2.10 percent of Si, greater than 0.50 percent and not more than 0.60 percent of Mn, greater than 0 percent and not more than 0.030 percent of P, greater than 0 percent and not more than 0.01 percent of S, 0.50-0.60 percent of Cu, 0.010-0.030 percent of RE, 0.030-0.050 percent of Mg and the balance of Fe. The ductile cast iron piston is produced by the ductile cast iron. The ductile cast iron piston is produced by coating thin-layer molding sand on a roughly-formed iron mold inner cavity. The filling, solidifying and cooling steps of a casting are finished under one perfect condition by reasonably controlling the quality and the wall thickness of the iron mold and the thickness of the coating sand layer, so that the factors for generating casting defects are eliminated to the maximum extent and further the quality of the casting is greatly improved.

Description

technical field [0001] The invention relates to a nodular cast iron, a nodular cast iron piston manufactured by the nodular cast iron, and a casting process for the nodular cast iron piston. Background technique [0002] The piston is one of the key components of the diesel pile driver, and its performance directly affects the life of the diesel pile driver. When the piston collides with the hammer seat longitudinally when it is working, it will generate a strong impact force due to the sudden change of speed. At the same time, the piston must also withstand the high temperature and high pressure of diesel combustion; therefore, the piston material is required to have high rigidity and fatigue strength and good wear resistance. With the development of nodular cast iron technology, its performance is constantly improving. High-quality and cheap nodular iron has become one of the important materials for making pistons. Nodular cast iron pistons have become a trend. It is easy...

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned casting process, the casting is at the root of the large riser, which is prone to shrinkage and shrinkage defects, resulting in unstable casting quality and high scrap rate

Moreover, the operability of the casting process is also deviated, and the workers are more dangerous. At the same time, it occupies a large area of ​​the site and the production cycle is also long.