Manufacturing process of high-strength spheroidal graphite cast iron sleeve pieces

Abstract

The invention relates to the casting industry, and provides a manufacturing process of high-strength spheroidal graphite cast iron sleeve pieces. The products manufactured by means of the process arehigh-strength spheroidal iron which mainly has the shop signs of the national standard QT700-3 and the national standard QT900-2. For the QT700-3 spheroidal iron, the tensile strength is larger than or equal to 800 Mpa, and the ductility is larger than or equal to 3%; and for the QT900-2 spheroidal iron, the tensile strength is larger than or equal to 900 Mpa, and the ductility is larger than or equal to 2%. The QT700-3 spheroidal iron reaches the advanced international standard-American standard ASTM A536 Grade100-70-03, the QT900-2 spheroidal iron correspondingly reaches the advanced international standard-American standard ASTM A536 Grade120-90-02, the spheroidization rate reaches 85% or above, and the compactness of the metallographic structure is high. The oxide inclusion is not higher than level II. The high-strength spheroidal graphite cast iron sleeve pieces are resistant to corrosion, abrasion and high temperature, and capable of achieving a good shock absorption effect, are not liable to crack, and are high in strength and free of deformation. The high-strength spheroidal graphite cast iron sleeve pieces are widely applied to crankshafts, shaft sleeves, gears, tool tracksand other mechanical parts.

Description

technical field [0001] The invention relates to the foundry industry, and relates to a manufacturing process for high-strength nodular cast iron sleeve blanks. The application of this process can achieve American Standard ASTM A536 Grade100-70-03, the international advanced standard of ductile iron American Standard American Standard ASTM A536 Grade120-90-02, the nodularization rate is over 85%, the metallographic structure is good, and the oxidized inclusions are not high In class II, corrosion resistance, wear resistance, high temperature resistance, good shock absorption effect, not easy to crack, high strength, no deformation. Background technique [0002] High-strength nodular cast iron is the focus and hot spot of mechanical parts such as crankshafts, bushings, gears, and machine tool rails. It uses special casting technology to improve quality and strength. All kinds of high-strength ductile iron parts on the device require corrosion resistance, wear resistance, high...

AI Technical Summary

Problems solved by technology

The conventional casting process cannot guarantee the strength and elongation, and there will be serious accidents of functional failure during use