Conveyor Belt Roller Aluminum Tube Precision Machining Process CNC Lathe Anodizing

This case details the manufacturing process of conveyor belt rollers (aluminum tube), including material selection, CNC machining, surface treatment, and quality inspection. Precision engineering ensures high accuracy, low runout (radial runout ≤0.35mm), and long service life (≥30,000 hours).

1. Material Preparation: 6061 aluminum alloy tubes are selected and inspected for diameter, wall thickness, and straightness. Tubes are cut to custom length (item width + 50mm).

2. CNC Machining:

• CNC lathe processes tube ends to achieve shaft hole tolerance (H7 grade).

• Machining shoulder structures to adapt to internal thread or spring press-in installation.

3. Shaft Assembly: Cold-rolled steel shafts (precision IT6) are pressed into tube ends using hydraulic presses to ensure concentricity.

4. Bearing and Seal Installation:

• HRB or ZWZ bearings are installed, pre-filled with lithium-based grease (2/3 of cavity volume).

• Labyrinth seal structure passes 72-hour waterproof test (zero water ingress).

5. Surface Treatment:

• Anodizing: Forms 10–15μm oxide layer for corrosion resistance.
• Optional coating: NBR or polyurethane coating (thickness ≥5mm) for friction or noise reduction.

6. Dynamic Balance Test: Testing on balancing machine for radial runout (≤0.35mm) and rotation resistance coefficient (≤0.02).

7. Quality Inspection:

• Load test: Dynamic load capacity ≥1.2 times design value.
• Visual inspection: Surface must be free of scratches and text (except SINBO laser engraving).

Rollers produced by this process are suitable for:

• Clean Rooms: Food/pharmaceutical industries with stainless steel or coated rollers.
• High-Temperature Environments: Quenched alloy steel shafts for temperatures above 200°C.
• Automated Units: Integration with manipulators for processing and handling systems.

Custom diameter, length, surface treatment (e.g., zinc plating, coating), and installation structures available. 3D drawing confirmation and sample prototyping provided.

• Technical consultation on machining process
• Quality reports (with test data)
• Small-batch trial production and large-order delivery