Heavy Duty Sugar Milling Section Wear Plate & Roller Bushings

Introduction to the Cane Diffusion & Milling Section

The cane diffusion and milling section is the most heavily loaded area in a sugar factory. Extracting juice from sugarcane generates extreme forces, placing significant stress on equipment. In such demanding conditions, bronze wear plates with embedded solid lubricants play a critical role in ensuring reliable operation.

These wear plates and bushings are commonly used in key components:

• Feeding Rollers: Continuously exposed to abrasive particles, moisture, and heavy loads while transporting raw cane into the mill.
• Mill Adjustment Mechanisms: Sliding parts that regulate roller gaps must withstand high pressure and maintain stability.
• Discharge Flap Mechanisms: Subjected to frequent reciprocating motion and challenging lubrication conditions.

To handle these harsh environments, high-strength brass alloys such as CuZn25Al5Mn4Fe3 (C86300) are widely used. Their high hardness (HB > 210) and excellent compressive strength make them ideal for heavy-duty applications. Additionally, a high concentration of embedded graphite ensures effective self-lubrication under low-speed, high-load operating conditions typical of sugar milling.

Core Applications in the Milling Tandem

The milling tandem depends on several critical sliding components to maintain alignment and withstand the extreme forces generated during sugarcane juice extraction.

1. Mill Housing Guides – Sugar Milling Section Wear Plates Self-Lubricating Wear Plates

Mill housing guides are among the most critical and high-cost sliding components in the milling frame. They are exposed to severe lateral forces as roller chocks move vertically with fluctuations in cane thickness.

To minimize wear, large graphite-plugged wear plates are installed on the sliding surfaces. These plates are typically mounted on the sides of the roller chocks. Due to the acidic nature of sugarcane juice, high-strength brass is used as the base material to prevent galling and seizure under heavy contact pressure.

2. Distance Adjustment Mechanisms – Flange Bushings C93700 Centrifugal Casting LBC-3 Bronze Bearings for Sugar Mill Tandems

Distance adjustment systems, whether manual or hydraulic, require durable flange bushings. These bushings must support both:

• Radial loads from the adjustment rods
• Axial thrust generated during positioning

We supply LBC-3 (C93700) centrifugal casting bronze bushings for milling tandems, manufactured to drawing and controlled to ASTM/JIS standards.

Core Components & Wear Challenges

Key Technical Solutions for Heavy-Duty Sugar Milling section Wear Plates

1. Fiber “Chip Removal” Design

Bagasse fibers can penetrate sliding surfaces and accelerate wear. Key design features include:

• Chamfered edges: Help scrape out trapped fibers during movement
• Staggered graphite layout: Ensures full-surface lubrication in all directions
• Graphite ratio (25–30%): Balances lubrication and structural strength

2. Dual Lubrication System

Under ultra-heavy loads (>100 N/mm²), relying solely on graphite is insufficient.

• Structure: Diamond or spiral oil grooves between graphite plugs
• Function:
  • EP grease is supplied during startup
  • Graphite provides backup lubrication under extreme conditions

This combined system can extend service life by 3–5 times.

3. Resistance to Electrochemical Corrosion

The milling environment is highly acidic (pH 4.0–5.5), often combined with stray electrical currents.

• Upgrade option: Aluminum bronze
• Advantage: Forms a dense protective oxide layer, significantly improving corrosion resistance compared to standard brass

4. Eliminating Stick-Slip (Crawling)

Heavy loads can cause unstable, jerky motion in sliding systems.

• Design approach:
  • Thick wear plates
  • Deep “X” or “#” oil groove patterns
• Mechanism:
  • Graphite generates micro-particles during friction
  • These form a ~0.5 μm transfer film on the surface
  • Ensures smooth, continuous motion and eliminates stick-slip

Importance of High-Strength Brass Base

Reliable performance depends on using CuZn25Al5Mn4Fe3 (C86300) with hardness ≥ HB210.

Technical Specifications (Heavy-Duty Wear Plates)

Material Comparison

By selecting high-strength brass with superior hardness and compressive strength, sugar mills can significantly reduce wear, extend service life, and ensure stable, continuous operation of the milling tandem.