1. Product Introduction
The hammer head of the crusher is the core vulnerable working part of crushing equipment such as hammer crushers and impact crushers. It is installed on the rotor of the crusher and uses the centrifugal force generated by the high-speed rotation of the rotor to impact, strike and squeeze materials such as ore, coal, construction waste, limestone, etc., to achieve the crushing processing of materials. It is an indispensable core component in the crushing production line. Its performance directly determines the crushing efficiency, the particle size of the crushed materials, the stability of the equipment operation and the production cost, and is widely used in many industries such as mining, construction aggregate processing, coal crushing, chemical raw material processing, construction waste recycling, etc.
2. Materials used
The core principle for the material selection of the crusher hammer head is "high strength, high wear resistance, impact resistance, good toughness", taking into account both wear resistance and fracture resistance to avoid cracking and breaking of the hammer head under high-speed impact. High manganese steel (ZGMn13) : The traditional mainstream hammerhead material, which has excellent toughness and work hardening properties, will quickly form a hardened layer on the surface (hardness can reach HRC50 or more) when impacted by the material, while the core still maintains good toughness and is not prone to cracking. It is suitable for crushing medium and low hardness materials (such as limestone, gypsum, coal, etc.) and offers good value for money.
The material ratio and heat treatment process directly determine the performance of the hammer head. The core ratios and heat treatment requirements for different materials are shown in the table below. By precisely controlling the composition and process, balance the wear resistance and toughness of the hammer head:
Material type | Core component ratio (mass fraction) | Heat treatment process | Core Purpose |
High manganese steel (ZGMn13) | Mn: 11% 14%, C: 1.0% - 1.4%, Si: 0.3% - 1.0%, 0.07% or less P, S 0.05% or less | Water toughening treatment (heating and holding at 1050 ° C -1100 ° C, water quenching and cooling) | Eliminate carbides, obtain a single-phase austenite structure, and enhance toughness and work hardening ability |
Chromium-molybdenum alloy steel | C: 0.3% 0.6%, Cr: 3% - 8%, Mo: 0.5% - 2.0%, Mn: 1.0% - 2.5%, V: 0.1% 0.5% | Quenching (850℃-950℃) + high-temperature tempering (200℃-350℃) | Refine grains, form tempered martensitic structure, and enhance hardness, wear resistance and toughness |
Bimetallic composite (high chromium + high manganese steel) | Wear-resistant layer: Cr:15%-20%, C:2.0%-3.0%; Base: Mn:11%-13%, C:1.0%-1.2% | After composite casting, quench and temper the whole | Achieve metallurgical bonding of the wear-resistant layer to the base, taking into account high wear resistance and high toughness |
3. Performance Introduction
The core performance of the crusher hammer heads revolves around four dimensions: wear resistance, impact resistance, toughness, and crushing efficiency. The performance of hammer heads varies greatly depending on the material and process, and the appropriate product should be selected based on the hardness of the material and the crushing conditions. The following provides a detailed description of the core performance characteristics and key indicators of the hammer heads, and presents a comparison of the performance of hammer heads made of different materials in the form of charts: During high-speed rotation (up to 800-1500r/min), the hammer head needs to withstand the high-frequency impact of the material. Therefore, it is necessary to have good impact resistance and toughness to avoid faults such as chipping, cracking, and breaking to ensure the stable operation of the equipment. In some crushing scenarios (such as crushing of chemical raw materials and moisture-containing materials), the hammer head needs to have a certain degree of corrosion resistance to avoid being eroded by corrosive materials and extend its service life, which can be enhanced by surface coating, alloying element addition, etc.
4. Specifications for Use
The specifications of the hammer heads of the crusher must be strictly matched with the model of the crusher, rotor size, rotational speed and the requirements of the crushed material. A design pattern combining standardization and customization should be adopted to ensure that the hammer heads are perfectly matched with the equipment to achieve the best crushing performance. Before installation, inspect the appearance of the hammer head to ensure there are no defects such as chipped corners, cracks, and air holes. At the same time, remove debris and rust from the surface of the hammer head and the connection part of the rotor to ensure a tight connection; When installing, the hammer heads should be installed symmetrically to ensure balanced rotation of the rotor and avoid excessive vibration during operation of the equipment.
5. Prospects for use
Product technology continues to be upgraded
In the future, the hammerhead of the crusher will be upgraded towards "high wear resistance, long service life, energy saving and customization". In terms of materials, the proportion of alloying elements will be further optimized, new wear-resistant alloy materials will be developed to enhance the wear resistance and toughness of the hammer heads while reducing material costs; In terms of process, advanced processes such as composite casting, precision forging, and surface spraying will be promoted to further optimize hammerhead performance and extend service life. For example, bimetallic composite hammerheads will gradually replace traditional high manganese steel hammerheads and become the mainstream choice for medium and high-end crushing scenarios.
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