PULVERIZING AND GRINDING HAMMER

摘要

An improved pulverizing and grinding hammer and methods of making and using such a hammer in a hammer mill are disclosed. The improved hammer has a trapezoidal insert made of a hard metal such as STELLITE 12 that is brazed onto a groove in a conventional hammer to form a contact face having an approximately ten degree layback angle with the vertical. The improved hammer provides a clear visible boundary between the insert material and base metal of the hammer, which acts as a wear indicator when the layback angle wears to approximately 40 to 50 degrees, the critical angle at which the size reduction efficiency of the mill decreases.