Quality Rivets: The Key to Durable and Reliable CNC Machined Parts(manufacturing parts Valentine)

  • Time:
  • Click:6
Rivets are a crucial component in many CNC machined parts and products. While they may seem insignificant, the quality and durability of rivets can make or break the structural integrity and lifespan of assembled components. This is especially true for parts made using computer numerical control (CNC) machining, where precision and consistency are paramount.
When sourcing rivets for a CNC machining application, there are several key factors to consider regarding quality:
Material Grade: Aircraft-grade aluminum is the gold standard for rivets in high-stress applications. The alloy is lightweight while maintaining good ductility, strength, and corrosion resistance. Steel and titanium alloys are other suitable materials. The material grade must match the base components being joined.
Dimensional Consistency: Quality rivets have an optimally designed shank, head, and point geometry. Deviations in dimensions by even a few thousandths of an inch can compromise the rivet's ability to securely join materials without cracking or pulling through. Rivet suppliers should provide certifications to confirm dimensional uniformity.
Surface Finish: The surface condition of the rivet impacts grip and pullout resistance. A smooth, uniform finish allows the rivet to slide into the prepunched hole cleanly. Rough surfaces introduce friction and galling that can weaken the joint.
Head Integrity: CNC machined components often undergo dynamic loading. The rivet head must be properly formed so it has sufficient bearing area to distribute force without buckling or snapping off from the shank. This requires a tight dimensional tolerance on head height and diameter.
Point Uniformity: For blind rivets, the pre-formed point must have a centered chisel point to penetrate and spread material evenly on the opposite side. Off-center points cause uneven deformation that makes the rivet prone to failure under load.
With so many critical quality factors, choosing the right rivet supplier is essential for CNC machined parts. Here are best practices for sourcing high-quality rivets:
- Verify certified test reports for minimum mechanical properties and chemical composition. Reputable manufacturers will provide lot traceability.
- Check dimensional tolerances and 100% inspection criteria. Sample audits help confirm production quality control.
- Request samples for test fitting, pulling, and sectioning to examine points and head formation.
- Ask about sourcing of base materials and in-house vs. outsourced finishing processes. Vertically integrated suppliers control quality better.
- Review packaging methods to ensure rivets are protected from moisture and contamination during handling and storage.
- Confirm availability of different head styles, sizes, grip lengths and point types for design flexibility.
The riveting process for CNC machined parts also impacts joint quality:
- Use properly sized dies in riveting tools to form heads without cracking. Replace worn dies promptly.
- Follow recommended pull pressures so rivets have sufficient clamping force but avoid shank shearing.
- Make sure parts are aligned squarely when riveting to prevent off-axis loading on rivets. Fixtures help.
- Deburr holes thoroughly so rivet shanks slide through freely without binding or shaving material.
- Apply sealants sparingly and avoid contaminating faying surfaces which can reduce friction for grip.
With diligent sourcing of high-quality rivets and proper installation techniques, CNC machined products will have durable, vibration-resistant riveted joints that withstand years of service. The upfront time invested in researching and qualifying rivets pays dividends through improved product reliability and reduced warranty claims. Precision-machined components deserve precision rivets engineered to optimize strength, durability and structural integrity. CNC Milling