High Quality Rivets for Precision CNC Machining(service de traitement thermique des métaux Hazel)
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What are Rivets?
A rivet is a mechanical fastener that consists of a cylindrical shaft and head. The shaft is inserted into pre-drilled holes in the materials being joined. The tail end is then mechanically deformed, usually with a rivet gun. This creates a second head and clamps the materials together. Common rivet types are blind, tubular and solid. Blind rivets can be installed from one side, tubular rivets have a hollow shaft, while solid rivets are entirely solid.
Benefits of Rivets for CNC Machining
Rivets offer numerous advantages for CNC machined parts and products:
- Permanent and secure fastening - Once installed, the rivet heads cannot pass back through the drilled hole, providing a permanent joint.
- Vibration resistance - Riveted joints can withstand vibration, shock loading and strain better than many other fastener types.
- Strength - The compressive clamping force created by rivet installation results in high shear and tensile strength.
- No threads or corrosion - Unlike screws and bolts, rivets do not have threads that can be damaged or corrode over time.
- Weight savings - Rivets allow lightweight and efficient joining of thin sheets of material.
- Speed of installation - Automated riveting is extremely fast compared to other techniques like welding or bolting.
- Variety - Many rivet styles, materials, sizes and strengths are available.
CNC Machining Considerations
To maximize rivet performance in CNC machined products:
- Hole alignment is critical - Any misalignment between rivet holes can induce stresses and joint failure. CNC hole positioning accuracy is vital.
- Hole sizing - Holes must be precisely sized for each rivet type and situation. Too large and rivets will be loose. Too small and material deformation or rivet breakage can occur during installation.
- Rivet selection - Consider the materials being joined and service loads. Select rivet material, head styles, grip range and break load accordingly.
- Automated riveting - Use CNC automated riveting systems for fast, consistent, high-quality installation. Manual techniques introduce variables.
- Quality checking - 100% inspect machined holes as well as installed rivets for defects. Check for cracks, damage, looseness and ensure full head formation.
Characteristics of High Quality Rivets
For reliable CNC machined products, rivets must be exceptionally consistent and flawless:
- Precisely controlled dimensions - Diameter, head height, head diameter, grip length, tail length and other dimensions should have very tight tolerances.
- Consistent hardness - The shaft and head hardness should be uniform from rivet to rivet for the same performance.
- Smooth surface finish - Any surface defects can reduce strength or cause cracking under stress. Top quality rivets have a smooth, uniform finish.
- Axial straightness - The rivet shaft must be perfectly straight along its axis to avoid assembly issues and irregular stress distribution.
- Concentricity - Heads should be precisely concentric to ensure uniform compression and clamping loads.
- Minimal flash - Excess material ("flash") around the rivet head should be minimized for easier installation and improved appearance.
- No defects - Cracks, porosity, voids and inclusions are unacceptable in high performance rivets. Careful manufacturing and quality control prevents defects.
Leading Rivet Brands for CNC Machining
High quality rivets optimized for CNC applications are offered by these top brands:
Cherry Aerospace
- Offers a full range of blind, solid and specialty rivets specifically for precision machining. Known for consistency and tight tolerances. Popular for aircraft and defense components.
Stanley Engineered Fastening
- Wide selection of standard, blind, tubular and semi-tubular rivets with alumimum, steel, stainless steel and specialty alloys available. Tight quality control.
LISI Aerospace
- Major global supplier of rivets for defense, aerospace, automotive and other industries. Stringent manufacturing and testing.
Arconic Fastening Systems
- Large catalog of optimized rivets for CNC automation. Capabilities from prototyping to full high-volume production.
Bollhoff
- Reputed for German-engineered rivets meeting stringent standards. CNC-focused blind and multi-grip rivets for diverse applications.
Conclusion
From critical aerospace components to high-volume automotive assemblies, quality rivets are indispensable for precision CNC machined products. Partnering with a leading fastener supplier and integrating automated quality inspections will ensure rivets uphold manufacturing consistency, performance and reliability specifications. With robust processes, CNC's automation and accuracy can be fully leveraged for flawless riveting and end products. CNC Milling CNC Machining