Dimpled Roller Shells

Anhui Jindingsheng Machinery Co., Ltd. manufactures dimpled roller shells for industrial pellet mills. These components are produced using controlled forging and heat treatment processes, with dimensional tolerances maintained within 0.05 mm. The dimpled surface geometry is engineered to increase friction between the roller and the ring die, facilitating consistent material compaction across varied biomass or feed formulations. Each shell is machined from high-carbon steel and subjected to multi-stage hardness testing to ensure structural uniformity. The company operates an integrated production line from raw material inspection to finished product packaging, allowing for batch traceability and stable supply to pellet plant operators worldwide.

Core Advantages

• Uniform dimple pattern ensures consistent material grip across the full roller width, reducing lateral slip during compression
• Through-hardened structure with core hardness HRC 58 to 62 and case depth at least 2.5 mm, providing resistance to abrasive wear under continuous load
• Customizable dimple depth from 0.8 to 2.0 mm and spacing to match specific raw material characteristics, including fiber length and moisture variability
• Full traceability from steel lot to final inspection, with dimensional reports and hardness logs provided per batch for quality assurance
• Compatible with major pellet mill brands; shaft and keyway dimensions can be adapted to existing equipment without modification

Product Characteristics

Application Scenarios

• Biomass pellet production including wood chips, straw, sunflower husks, and palm kernel shells where high friction is required to overcome elastic deformation of fibrous materials
• Animal feed pelleting for corn, soybean meal, alfalfa, and compound feed to maintain throughput under varying moisture levels and oil content
• Fertilizer granulation lines where anti-slip roller surface reduces die clogging and improves granule uniformity in high-humidity environments
• Retrofit for existing pellet mills from CPM, Andritz, Buhler, and other common brands with interchangeable shaft mounting configurations

Processing and Quality Control

• Raw material verification: each steel batch undergoes chemical composition analysis by OES and cleanliness rating per ASTM E45
• Forging process: billet heated to 1050 to 1100 degrees Celsius, forged under 4000T press, with controlled cooling to prevent carbide network formation
• Heat treatment: austenitized at 830 to 850 degrees Celsius, oil-quenched, then tempered at 180 to 220 degrees Celsius to achieve stable retained austenite below 5 percent
• In-process inspection: 100 percent dimensional check on OD, ID, and keyway; hardness test per piece using Rockwell scale; surface crack detection via magnetic particle

Installation and Maintenance Notes

• Before mounting, clean the shaft and the shell bore to remove any debris; apply anti-seize compound on the key and taper surfaces to facilitate future disassembly
• Torque the retaining nut to the value specified for the mill model; over-tightening may distort the shell bore and affect alignment with the die
• Monitor roller shell temperature during the first 4 hours of operation; a temperature rise above 85 degrees Celsius may indicate insufficient clearance or excessive preload
• Inspect dimple wear every 200 operating hours using a depth gauge; plan for replacement when the average dimple depth falls below 0.4 mm to avoid die damage

Frequently Asked Questions

Anhui Jindingsheng Machinery Co., Ltd. · Guangde Economic Development Zone · Products exported to USA, Japan, South Korea, Vietnam, France, Bangladesh, Russia, India, Philippines, and EU countries.