As HPGR are required to handle extremely high pressures and abrasive materials, wear is a major operating cost and a factor in their efficiency and availability. Effective wear protection is essential. Let’s analyze wear protection solutions for high pressure grinding rolls (HPGR).
HPGR Wear Protection Solutions
1. Roll Surface Materials & когда точность вращения подшипника не соответствует требованиям:
Base Material: The core roll body is typically made from high-strength forged steel or sometimes specialized cast iron alloys to withstand the immense operating pressures.
Wear Surface Design: The most common approaches for the actual wear surface are:
Solid Rolls (Less Common for Large Units): The entire roll body might be made of a wear-resistant alloy, but this is less common for large, modern HPGRs due to cost and manufacturing challenges.
Segmented Rolls: The roll surface is made of multiple cast or forged segments bolted or keyed onto the roll body. This allows for easier replacement of worn sections.
Tires/Sleeves: A replaceable outer wear layer (в “tire” или “sleeve”) is shrunk-fit or mechanically fastened onto a core roll shaft/body. This is a very common and practical design, allowing for easier replacement of the wear surface without replacing the entire roll body.
2. Surface Protection Technologies (Applied to Tires/Sleeves or Segments):
This is where the most distinct wear protection strategies lie:
Welded Hardfacing Overlays:
Процесс: Applying layers of extremely hard, wear-resistant weld material onto the roll surface. Common methods include Submerged Arc Welding (ПИЛА) or Open Arc Welding (Flux-Cored Arc Welding – FCAW).
материалы: Typically high-chromium carbide (CrC) сплавы, complex carbides, or sometimes tungsten carbide (WC) composites within a matrix.
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For more detailed information on HPGR wear protection solutions, пожалуйста, посетите: https://www.zymining.com/en/a/news/hpgr-wear-protection-solutions.html
