Martillos de Chancador | Piezas para Chancador de Martillos | ATF

Crusher Hammers: Impact Elements for Size Reduction

Hammers are the primary impact elements in hammer crushers and hammer mills, mounted on rotor pins within a spinning assembly that delivers high-energy impacts to feed material at tip speeds typically ranging from 25 to 50 meters per second. Each hammer strike transfers kinetic energy proportional to the hammer mass and the square of the rotor velocity, making both weight and speed critical parameters in determining size reduction efficiency. Hammer design geometry, including the face angle, thickness, and overall profile, directly influences product gradation, throughput capacity, and energy consumption per ton processed. ATF manufactures hammers in weights ranging from 10 kg for small hammer mills up to 500 kg for large primary hammer crushers, with every set precision weight-matched to prevent rotor imbalance that accelerates bearing and housing wear.

Material selection for hammer crusher hammers depends on the balance between impact loading and abrasive wear specific to each application, as well as the presence of tramp metal in the feed. Austenitic manganese steel grades (Mn14Cr2 and Mn18Cr2 per ASTM A128) provide excellent impact toughness and progressive work-hardening from 200 HB to over 500 HB at the striking face, making them ideal for high-impact applications such as clinker crushing, demolition recycling, and hard rock processing where tramp metal is present. Martensitic steel hammers at 450-550 BHN offer a balanced solution for moderate impact and abrasion, arriving hard as-delivered without requiring work-hardening. High-chrome white iron at 60-64 HRC maximizes abrasion resistance for clean, non-metallic feeds such as coal, glass cullet, and mineral sands, but is brittle and will fracture under heavy impact loading or tramp metal events.