Thermoplastic upsetting-forming method for abrasive ball

Abstract

The present invention discloses a thermoplastic upsetting formation process of abrasive ball as one kind of grinding material. Into iron-base material, Cr, C, Mo, V, Mn, Si, RE and other alloy elements are added to form alloy material, which are passed through smelting, casting, cutting, thermoplastic upsetting and forging formation, post-forging treatment to produce the various kinds of abrasive ball. The abrasive ball product has diameter 30-140 mm, ellipticity less than 3mm, impact toughness over 10 joule / sq cm, and breaking rate less than 0.35%. It is used widely in grinding Fe, Al, Cu and other metal ore powder as well as coal, quartz, various ceramic powder and other non-metal ore powder with microhardness lower than 1000 Hv.

Description

technical field [0001] The invention belongs to the scope of grinding material preparation, in particular to a thermoplastic upsetting-forming method of grinding balls. Background technique [0002] There are many kinds of grinding balls, and their chemical composition is an important factor to determine their performance. Therefore, they are divided into cast or forged grinding balls made of iron with carbon, silicon, manganese and other elements. The interior of the manganese steel grinding ball mainly composed of high manganese steel is mainly Fe-c type carbide, which has low microhardness and poor wear resistance; holes, segregation and shape errors are inevitable during casting, and it is difficult to achieve broken balls. The requirements for using the two indicators of rate and out-of-roundness. The most popular high-chromium cast iron wear-resistant material is suitable for making industrial ore powder and other industries with impact wear parts, but its impact toug...

AI Technical Summary

Problems solved by technology

In the 1990s, my country's steel mold ball casting technology made a breakthrough, giving full play to the advantages of high-chromium cast iron materials. Its products have been widely promoted in China, and its impact toughness index has increased to nearly 8 joules / cm 2 , but the continuous casting and continuous rolling production line has huge investment, many technically influencing factors, casting defects with many holes and gaps in the center of the product have not been effectively eliminated, the utilization rate of molten iron is not high, and the production scale is difficult to expand

For the alloying ratio of high-chromium as-cast grinding balls, substantial progress has been made in the theoretical and applied research of casting molding and heat treatment, but the impact toughness values ​​of as-cast high-chromium grinding balls are generally low. Cracks often occur and fail, reducing the working life