High Quality Rivets for CNC Machined Parts(strip plating Kama)
- source:GAENOR CNC Machining
What Makes a Quality Rivet?
A quality rivet has several important characteristics:
Material - Aircraft grade aluminum is the most common material for high strength structural rivets. Stainless steel and titanium are also options for very high strength applications. The material must be compatible with the parts being joined.
Strength - The rivet must have adequate shear and tensile strength for the application. This is dependent on rivet diameter, material, grip length, and head style.
Consistency - Quality rivets have minimal variability in material properties and dimensions. Rivets from the same batch and supplier should have consistent strength.
Durability - A quality rivet maintains its strength after being installed. It has good corrosion and fatigue resistance for the expected lifetime of the component.
Precision - Diameter tolerances of ±0.001" or better ensure consistent grip length and hole fill. Consistent head height, shape, and diameter are also essential.
Testing - Reputable suppliers rigorously test rivets to verify they meet specifications for material properties, dimensions, and performance.
Types of Rivets for CNC Machining
Several types of rivets are commonly used in CNC machined products:
Blind Rivets - Also called pop rivets, these have a mandrel through the hollow body which is pulled to flare out the tail. Blind rivets are easy to install with access only to one side.
Solid Rivets - Solid shank rivets require access to both sides of a joint. They are installed by upsetting the tail with a rivet gun or hammer. Very strong and secure.
Self-Plugging Rivets - These have a tapered mandrel that fills the hole after installation so no shavings are left inside the material. Common in aircraft production.
Drive Rivets - Also known as screw rivets, they are threaded and driven like a screw with access to only one side needed.
Structural Rivets - Extra strong rivets used for highly stressed connections on aircraft, vehicles, and other structures. Typically made from 2117 aluminum alloy.
Countersunk Head Rivets - The head is cone or cup shaped to fit flush in a countersunk hole. Used when a flat surface is needed for aerodynamics or appearance.
Domed Head Rivets - Have a shallow convex head that provides a smooth, finished look. Common for visible surfaces.
Selecting the Best Rivets
To select the optimal rivets for a CNC machined component, consider these factors:
Joint Strength Needed - Determine the shear and tensile loads. Structural rivets are required for high strength.
Material Being Joined - Match rivet material to the base material to avoid galvanic corrosion.
Hole Sizes - Rivet diameter must match hole size. Allowance is needed for expansion during installation.
Grip Range - Grip is the combined thickness of materials being joined. Make sure rivet length spans the grip range.
Accessibility - Closed rivets require only one side access. Solid rivets need two sides.
Environment - Pick rivets with suitable corrosion resistance and weatherability.
Appearance - If appearance matters, choose rivets with domed or countersunk smooth heads.
Cost - Less expensive rivets may sacrifice durability. Prioritize strength over minor savings.
Testing - Verify rivet performance under simulated operating loads during prototyping.
By carefully analyzing the application requirements and selecting high quality rivets purpose-made for the job, CNC machinists can produce components with optimal strength, lifetime, and aesthetic appeal. Investing in precision aerospace or military-grade rivets brings significant quality dividends for critical machined products. CNC Milling CNC Machining