High Quality Rivets for Precision CNC Machining(manual machining Jodie)
- source:BAGANZ CNC Machining
Aircraft grade aluminum is a popular rivet material for CNC machined components. 6000 series aluminum alloys like 6061 and 2024 provide high strength-to-weight ratios. 2117 aluminum is also used for its excellent shear and tensile strength. Titanium and stainless steel rivets offer high strength and corrosion resistance where needed. Using rivets made from the same material as the components they join reduces the risk of galvanic corrosion.
The grip range, diameter, and ultimate shear and tensile strength ratings are key metrics for rivet strength. A wide grip range provides flexibility to join varying material thicknesses. Large diameter rivets and high shear/tensile strength ratings result in stronger joints. Discuss your application with your rivet supplier to select the optimal rivet strength for your design.
Rivet Head Styles
Popular rivet head styles include:
- Countersunk - Flush smooth surface for aerodynamic profiles.
- Universal/Flat - Low profile smooth surface.
- Round - Conical shape for welding applications.
- Brazier - High strength large head.
- Modified Brazier - Higher shear strength than standard Brazier.
The head style impacts the look, strength, and assembly technique, so consider each carefully. Ask for samples to test different head styles.
Precision Tolerance Rivets
Tolerances on the rivet diameter, head height, grip length, and other dimensions should match the precision needs of your CNC machined components. Request certification documents to confirm the rivet tolerances. For ultra-high precision assemblies, custom diameter and grip length rivets may be warranted.
Rivet Insertion Techniques
Common techniques to insert rivets during CNC machined product assembly include:
- Automated riveting - High volume production with automatic tool changing.
- Manual riveting - Operator uses a rivet gun for lower volume production.
- Hot riveting - Rivets inserted in a malleable state then formed in place.
- Cold riveting - Rivets driven into place at room temperature.
- Self-piercing rivets - Pierce and join metal sheets without pre-drilled holes.
- Blind rivets - Installed from one side without access to the rear.
Discuss the pros and cons of each technique with your assembly team to select the optimal method.
Reputable rivet suppliers thoroughly test their products to validate strength and quality. Ask for test reports for shear, tensile, cleavage, mandrel retention, and other key characteristics. Rigorous testing ensures reliable performance of rivets in your machined components.
In some cases, secondary operations may be applied to rivets to enhance their functionality, such as:
- Coatings: Lubricity, anti-galling, corrosion resistance.
- Etching: Improves paint adhesion.
- Color-coding: Visual identification.
Talk through secondary operation needs with your rivet supplier early in the design process.
Partnering with a capable and reliable rivet supplier is key to success. Seek suppliers with:
- Broad range of rivet styles and materials.
- Consistent lot-to-lot quality.
- Flexible order quantities and lead times.
- Exceptional customer service.
- Value-added services like custom etching.
- Conformance to standards like AS9100 and ISO 9001.
By taking the time to carefully select your rivets and supplier, you can achieve consistently high quality and reliable performance in your CNC machined end products. Precision engineered rivets complement the automated accuracy of CNC manufacturing. Discuss your project with a knowledgeable rivet supplier early in the design phase to ensure optimal material selection and head styles. CNC Milling