Fleshing Cylinder

The fleshing cylinder is a critical rotating component within a fleshing machine used in leather processing. It consists of a cylindrical drum with specialized blades or cutting edges that rotate against the flesh side of animal hides to mechanically remove unwanted tissue, fat, and membrane layers, preparing the hide for subsequent tanning and finishing processes. The cylinder is typically manufactured from high-carbon steel, tool steel, or stainless steel, with a surface hardness of 50–60 HRC and a surface roughness of Ra 0.8–1.6 µm. The working width ranges from 1500 to 3200 mm, and the cylinder diameter from 200 to 400 mm, depending on the machine model and hide size capacity. Rotational speed is typically 50–150 rpm, driven by a motor with power ranging from 7.5 to 30 kW. The operating temperature range is 5–40 °C. The cylinder material is often ductile iron (e.g., QT500-7 per GB/T 1348), while blade material may be Cr12MoV per GB/T 1299. The weight of the cylinder assembly ranges from 800 to 2500 kg, and the IP rating is typically IP54–IP65 per IEC 60529. These parameters are reference ranges; actual values must be confirmed with the manufacturer for specific models. The fleshing cylinder operates by rotating at controlled speeds while the hide is fed against its surface. The cutting edges scrape away flesh and fat layers through mechanical action, with pressure and feed rate carefully controlled to ensure uniform removal without damaging the grain layer. Proper maintenance includes regular inspection of blade sharpness, cylinder balance, and bearing condition. Signs of wear include reduced flesh removal efficiency, increased vibration, or visible blade dulling. Failure boundaries include excessive wear, blade breakage, or cylinder deformation, which can compromise hide quality and machine safety. When selecting a fleshing cylinder, consider hide type, desired throughput, and compatibility with existing fleshing machines. Verify model-specific dimensions, materials, and standards with the legal manufacturer or supplier.

The fleshing cylinder rotates at controlled speeds while the hide is fed against its surface. The cutting edges on the cylinder's surface scrape away flesh and fat layers through mechanical action. Pressure and feed rate are carefully controlled to ensure uniform removal without damaging the grain layer of the hide. The cylinder's speed and the hide's feed rate are adjusted based on hide thickness and condition. The blades are designed to maintain a consistent cutting angle and depth, and the cylinder's surface hardness and roughness are optimized for wear resistance and effective flesh removal. The process requires careful monitoring to avoid over-cutting or tearing the hide. The cylinder's rotational speed, typically 50–150 rpm, is set to balance throughput and quality. The motor power, ranging from 7.5 to 30 kW, provides the necessary torque. The working width and cylinder diameter determine the maximum hide size that can be processed. The system is designed to operate within a temperature range of 5–40 °C to maintain lubrication and material properties. Regular maintenance includes checking blade sharpness, cylinder balance, and bearing condition. Signs of wear include reduced flesh removal efficiency, increased vibration, or visible blade dulling. Failure boundaries include excessive wear, blade breakage, or cylinder deformation, which can compromise hide quality and machine safety.