Spheroidal graphite ausferrite cast iron grinding ball suitable for being used in semi-automatic grinding machine and preparation process

Abstract

The invention relates to a spheroidal graphite ausferrite cast iron grinding ball suitable for being used in a semi-automatic grinding machine and a preparation process. The spheroidal graphite ausferrite cast iron grinding ball is prepared from the following components in percentage by mass: 3.2 to 3.9 percent of carbon, 2.30 to 2.93 percent of silicon, 0.96 to 2.80 percent of manganese, 0.21 to 0.90 percent of chromium, 0.11 to 0.60 percent of copper, 0.10 to 0.80 percent of molybdenum, 0.10 to 0.68 percent of vanadium, 0.10 to 0.78 percent of titanium, 0.01 to 0.09 percent of niobium, greater than or equal to 0 and less than 0.05 percent of phosphorus, greater than or equal to 0 and less than 0.03 percent of sulfur, 0.03 to 0.05 percent of magnesium, 0.02 to 0.03 percent of rare earth elements and the balance of iron. The preparation process comprises the following steps: firstly, performing casting forming to prepare a cast grinding ball; secondly, performing thermal treatment on the cast grinding ball to prepare the spheroidal graphite ausferrite cast iron grinding ball. The hardness of the heart part of the spheroidal graphite ausferrite cast iron grinding ball disclosed by the invention is 54 HRC, and the surface hardness is 58 HRC; the impact toughness is 17 to 20 J / cm2; furthermore, the spheroidal graphite ausferrite cast iron grinding ball is higher in processing hardening capacity; in a wear process, a worn layer is processed to be hardened, so that the hardness can be up to 62 to 64 HRC, and the wear amount is 70 percent of that of a general forged ball.

Description

technical field [0001] The invention relates to an ausferitic nodular iron grinding ball, in particular to an ausferitic nodular iron grinding ball suitable for use in a semi-autogenous mill and a processing technique thereof. Background technique [0002] At present, the existing domestic grinding balls include high chromium balls, low chromium balls, forged steel balls, ADI grinding balls, CADI grinding balls and so on. [0003] High chromium balls and low chromium balls are cast processing balls. Due to defects such as low impact toughness, high ball breaking rate, low hardness, and poor wear resistance, they are mainly composed of carbides and martensite, and can only be used in small ball mills. [0004] Due to the large radius of the semi-autogenous mill, the impact value of the required grinding balls must be high. At present, semi-autogenous mills use universal forged balls for grinding balls at home and abroad. They are made by cutting, forging and heat treatment of...

AI Technical Summary

Problems solved by technology

[0006] Austenite ductile iron grinding ball is a kind of grinding ball with high strength and toughness, especially strong work hardening ability. It has a wide range of applications and is suitable for high impact and wear-resistant occasions. It belongs to the field of casting processing. It is widely used in manufacturing, thermal power generation and other fields, but due to casting defects, complex heat treatment process, and low impact value, austeric ductile iron grinding balls have not been used in semi-autogenous grinding machines.

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