High Quality Rivets for CNC Machining(large cnc machining directcnc net Bard)
- source:MAJA CNC Machining
What Makes a Good Rivet?
For CNC machined products, rivets need to have specific qualities to perform well:
- Strength - The rivet must be strong enough to handle expected loads and forces without failing. Aircraft and industrial rivets are designed for shear and tensile strength.
- Durability - Resistance to weathering, corrosion, vibration, and fatigue are vital. Aerospace rivets are made from aluminum alloys for durability. Stainless steel offers high strength and corrosion resistance.
- Precision - Consistent and standard diameters, head shapes, and lengths allow for automated installation in CNC processes.
- Reliability - Quality rivets install predictably without jamming equipment. Structural rivets must perform consistently without fail.
- Material compatibility - Rivets should be made from a material compatible with the metals used in the CNC machined parts they are joining. This prevents galvanic corrosion.
Key Rivet Materials
- Aluminum - Lightweight, strong, and corrosion resistant. Widely used for aircraft and other CNC machined components.
- Steel - High strength and hardness. Used for high stress applications. Can be heat treated to customize strength. Prone to corrosion.
- Stainless Steel - Strong, corrosion and heat resistant. Ideal for harsh environments. More expensive than other steels.
- Titanium - Extremely strong but lightweight. Resists corrosion and high temperatures. Costly but ideal for aerospace.
- Monel - Stronger than stainless steel and resists corrosion. Mainly used in marine and chemical industries.
- Copper - Heavy but highly resistant to fatigue and corrosion. Used in pipes and boilers.
- Shear strength - Resistance to transverse forces. Important for aircraft and structural joints.
- Tensile strength - Resistance to being pulled apart. Critical for attachments that undergo tension.
- Fatigue strength - Ability to withstand cyclic loads without failure. Necessary for dynamic components.
- Pressure tightness - Leak resistance and ability to maintain joint integrity. Vital for pipelines and vessels.
How Rivets Are Installed
- Hand riveting - Manual installation with a rivet gun or hammer. Lower throughput but useful for prototyping or low volume production.
- Pneumatic riveting - Rivet gun driven by compressed air. Faster than manual and useful for medium production runs.
- Hydro-pneumatic riveting - Combination of hydraulic pressure and compressed air for high speed automated riveting.
- Impact riveting - High energy impact hammering machines to cold form rivets. Produces flush surface and high clamp loads.
- Orbital riveting - Spindle with off-center cam creates radial impacts to install rivets. Excellent for automated aircraft production.
- Robotically automated - Robots with specialty riveting end effectors provide flexible high speed installation. Ideal for mass production.
Rivet Quality Control
Strict quality control is crucial when sourcing rivets for CNC machined products:
- Raw material certification - Chemical composition and mechanical testing data for source metal.
- Dimensional inspection - Sample testing of rivet diameters, lengths, head shapes, and geometries.
- Mechanical testing - Measurement of shear, tensile, and fatigue strengths on sample rivets.
- Process audits - Inspection of manufacturer's production and quality control processes.
- Surface finish checks - Examination of rivet surface qualities and absence of flaws.
- Batch traceability - Detailed records linking rivets to production batches and raw materials.
- Staff training - Validation of worker skills and riveting proficiency.
Choosing the optimal rivets and verifying their quality is essential for creating durable CNC machined products that perform reliably in demanding conditions. Careful attention to rivet specifications and manufacturing quality control processes is key. CNC Milling CNC Machining