Uses for Rivets in CNC Manufacturing and Design(aerospace cnc machine James)
- source:NEWRGY CNC Machining
Joining Thin Sections
Rivets are ideal for joining thin sections of material that may be difficult to weld or bolt together. The riveting process deforms the rivet shank, forming a strong mechanical connection even with very thin material. CNC machining allows for precision drilling of rivet holes even in delicate materials. Rivets are commonly used to assemble aluminum alloys, sheet metal, and other thin materials in aircraft and transportation applications.
Assembling Dissimilar Materials
Rivets can join different metals or other materials that have different properties. For example, rivets provide a simple way to assemble steel and aluminum components while avoiding some of the distortion caused by welding dissimilar metals. The mechanical grip of the rivet can accommodate differences in thermal expansion and conductivity between materials. Riveting also produces little heat distortion compared to welding.
Quick and Efficient Assembly
Automated riveting with CNC technology provides a fast, consistent production method. CNC machines can be programmed to drill rivet holes and insert rivets rapidly and precisely. Multiple rivets can be installed simultaneously in a pattern to distribute load and stress. This can significantly reduce production time compared to manual drilling and riveting. Automotive, aerospace, appliance, and other manufacturers use CNC riveting for mass production.
No Adhesives or Curing
Structural adhesives require clamping and curing time to reach full bond strength. Rivets provide immediate full mechanical strength upon installation. This allows faster production by eliminating wait and cure times. Rivets also avoid concerns about adhesive expiry or temperature sensitivity. The purely mechanical nature of rivets provides reliable performance.
Disassembly and Maintenance
Rivets allow non-destructive disassembly for maintenance and part replacement. By drilling out the rivet head, technicians can remove and replace individual components from an assembly. In comparison, welds and adhesive bonds require destructive methods to separate. Rivets make disassembly easier for maintenance, upgrades, and repairs.
CNC riveting tools allow access to confined spaces. Right angle rivet guns can insert fasteners in areas beyond easy reach or line of sight. This facilitates riveting internal structures, spaceframes, and compartments. Automated riveting can improve consistency in hard to access locations.
High Strength Options
While rivets traditionally offer less shear and tensile strength than bolts, advances in rivet materials and designs increase strength capabilities. Specialty rivet types such as blind, flush, and self-piercing provide very strong connections. Exotic alloys and mechanical locking spike rivets also increase rivet strength. CNC allows precise installation of these high-strength rivets.
Joining Composite Materials
Blind rivets and specialty fasteners allow riveting of composite materials. Plastics, carbon fiber panels, and fiber-reinforced polymer composites can be riveted to join dissimilar materials. Rivets minimize drilling and machining of brittle composites. Careful process control with CNC reduces potential for delamination damage.
Many rivet alloys provide excellent corrosion resistance for demanding operating environments. Stainless steel, aluminum, nickel alloy, and titanium rivets withstand corrosion, chemicals, and salt spray. Plastisol coatings can also improve corrosion protection. Rivets offer reliable fastening without external threads prone to corrosion.
The one-way installation of rivets creates permanent fastening. Rivets cannot loosen over time from vibration or shock like threaded fasteners. The blind side deformation resists tampering or disassembly. High shear strength deters forced removal. These properties help security-sensitive applications in aerospace, defense, banking, and others.
Electrical and Thermal Conductivity
Metal rivets maintain electrical continuity and allow current flow across a joint. This is important in grounding applications. Rivets also provide good thermal conduction between components, helping dissipate heat. Copper and aluminum rivets optimize conductivity. Insulating materials can electrically isolate riveted joints when needed.
Noise and Vibration Damping
Properly installed rivets have minimal rattle or vibration issues. The tight tolerance and rivet deformation creates solid connections. Lack of threads avoids any potential for loosening. Rivets provide consistent and dependable noise suppression. Viscous damping coatings can further reduce vibration transmission through riveted structures.
Because rivets seal and mechanically interlock materials, they can create water-resistant joints. Properly seated rivets prevent fluid ingress, an advantage for marine and underwater applications. Rivets avoid leaks caused by corrosion or loosening of threaded fasteners. Sealing washers can enhance the water barrier.
High Fatigue Strength
While rivets have lower tensile strength than bolts, their fatigue strength can exceed bolts. Fatigue is failure from cyclic loading rather than static forces. The rivet grip distributes flexing over a wider area, reducing crack initiation points. Applications such as aircraft that undergo dynamic loading take advantage of rivets’ high fatigue life.
Rivets allow more freedom in design compared to welds and adhesives. Joints can be optimized for efficient load transfer because rivets come in a wide range of diameters and materials. Gussets and brackets provide flexible reinforcement options. Riveting also facilitates curved geometries and complex assembly contours and angles.
Rivets are among the lightest possible mechanical fasteners, an essential factor in aircraft and space applications. Small rivets can provide sufficient fastening strength while minimizing weight. High-strength aluminum rivets are popular in aerospace manufacturing. CNC automation maximizes riveting while optimizing the number of fasteners.
Rivets provide a cost-effective assembly method. Raw rivet materials are relatively inexpensive. Automated CNC machinery allows rapid installation with minimal labor. Modular riveted designs facilitate repairs and part replacement. The combination of speed, flexibility, and disassembly makes riveting very economical for high production rates.
These are some of the advantages that make rivets a popular choice for CNC-based manufacturing. From precision aerospace structures to large-scale industrial applications, automated riveting improves quality, speed, and reliability. CNC technology combines versatile rivet designs and specialized fasteners with automated precision to enable widespread use in manufacturing. Continued development expands the capabilities of riveted connections, making them a staple fastening method in modern production. By leveraging rivets’ unique benefits, CNC processes maximize manufacturing productivity and efficiency. CNC Milling CNC Machining