High Quality Rivets for Precision CNC Machining(alodine aluminum Troy)
- source:BAGANZ CNC Machining
What Makes a Good CNC Rivet?
Several factors determine the suitability of a rivet for CNC machining:
Material - Aircraft-grade aluminum is the most common material for CNC rivets due to its strength, corrosion resistance, and machinability. Steel, titanium, copper, and other alloys are also used for specialized applications. The material must be durable enough to withstand machine-driven installation forces.
Head Shape - Round, flat, and countersunk head shapes allow the rivet to sit flush on the workpiece surface. CNC machines require consistent head shapes to smoothly grab and upset the rivets.
Shank Length and Diameter - Precision shank dimensions allow the rivets to be fed reliably through CNC machinery and ensure consistent fit into pre-drilled holes. Longer shanks are needed for thicker material stacks.
Grip Range - The undeformed shank length should cover the total thickness of the materials being joined, allowing the rivet to expand within the hole and grip both sides. Standard grip ranges are available.
Drivability - The hardness and ductility of the rivet metal affects how easily it upsets and work-hardens during rivet setting. Rivets must upset without cracking or becoming too hard.
Precision and Consistency
The chief advantages of using CNC machines for riveting are precision and consistency. This requires every rivet fed into the machine to have near-identical properties within very tight tolerances. Some factors that must be tightly controlled:
- Diameter - Variations above a few thousandths of an inch will cause poor fit in holes.
- Length - Even small length deviations will prevent proper setting.
- Head height/shape - Inconsistent heads disrupt machine feeding.
- Material composition - Differences in hardness or ductility will affect drivability.
- Surface defects - Cracks or voids can cause rivets to fail during upset.
By specifying and sourcing rivets held to tight tolerances in these areas, CNC setups can achieve fast, accurate, and repeatable rivet installation unachievable through manual processes.
Quality Assurance Testing
Reputable rivet manufacturers carry out extensive quality testing to verify critical dimensions, material properties, surface quality, and performance characteristics. Common tests include:
- Push/pull testing - Measures tensile and shear strength of set rivets.
- Hardness testing - Checks material hardness to prevent cracking.
- Microscopy - Detects microscopic defects in the rivet surface.
- Salt spray testing - Assesses corrosion resistance by exposing rivets to salt fog.
- Sample riveting - Tests drivability and hole fill percentage.
- Dimensional inspection - Confirms rivet head, shank, and grip length dimensions.
By testing across production runs, manufacturers can validate the reliability and consistency from batch-to-batch. Certificates of conformance are typically provided with purchased rivets.
CNC Riveting Applications
With quality rivets, CNC machines enable automated riveting for mass production across many industrial sectors:
Aerospace - Riveting of aircraft fuselages, wings, and other components where high strength and reliability are critical.
Automotive - Robotic riveting of auto body panels, frames, and sheet metal components on assembly lines.
Appliances - High-speed joining of home appliance casings and interior parts.
Construction - Riveting of HVAC ducting, heavy equipment, and structural building components.
Electronics - Riveting internal electronics enclosures with consistent precision.
Transportation - Rail, shipbuilding, and other transportation equipment use rivets for structural assembly.
Key Benefits of CNC Riveting
Compared to manual riveting, automated CNC setups provide major benefits:
- Speed - CNC machines can install up to several thousand rivets per hour.
- Repeatability - Rivets are identically driven for consistent joint integrity.
- Quality - Automated precision reduces human error and material waste.
- Load capacity - CNC machines can exert the high forces needed to set heavy-duty rivets.
- Reduce labor - One machine operator oversees a robotic work cell.
- Flexibility - Quick changeovers between different rivet locations and diameters.
By combining CNC efficiency with optimized, precision-manufactured rivets, manufacturers can improve product quality and throughput across nearly any production line. The consistency of automated riveting raises the bar on performance standards in every industry.
From aircraft assembly to appliances, CNC riveting automation drives improvements in manufacturing. To leverage the benefits of CNC rivet setting, quality rivets designed for precision machinery are essential. With rigorous quality control and testing, today's high-performance rivets meet the demands of automated production. Together, CNC machines and optimized rivets will continue modernizing assembly across industrial sectors. CNC Milling