AGGREGATE CRUSHING TOOL

摘要

An improved crushing tool for the processing of aggregates, and a heat treatment method for metals used in the fabrication of such tools, is provided. The crushing tool may comprise an attachment portion having a relatively low material hardness and a crushing portion having, in comparison to the attachment portion, a relatively high material hardness. For example, the hardness of the attachment portion may be in the range of 20-35 HRC, and that of the crushing portion may be in the range of 50-60 HRC. Use of tool-grade steel, such as AISI S7 steel, may thereby result in a tool offering a compromise between the hardness (wear-resistance) of the crushing portion and the toughness of the attachment portion. A heat treatment process for the tool-grade steel may involve distinct heating, quenching, and tempering cycles in order to achievable desirable material properties.

主权项

1. A method of heat treating a material, comprising:
heating the material to a first temperature within the range of 1650° F. to 1850° F. and holding the material at the first temperature for a first period of time within the range of 1.5 to 3 hours; quenching in a cooling environmental until the material reaches a second temperature within the range of 125° F. to 240° F.; and tempering the material at least once at a third temperature within the range of 325° F. to 450° F. for a second period of time within the range of 1.5 to 3 hours.