Riveting Sheet Metal - A Key Process in Metal Fabrication(difference between pla and abs Lilith)
- source:BAGANZ CNC Machining
How Riveting Works
Riveting entails drilling holes on the materials to be joined, usually sheet metals, inserting rivets in them and deforming the rivet heads to clamp the materials together. The rivet shank acts as a dowel, while the deformed head applies pressure like a clamp to hold the materials. The rivet head can be deformed using hammering, squeezing or rolling. The friction and compression between rivet, materials and deformed rivet head create the joint.
Various Rivet Types
- Solid/Drive Rivets: Have heads on both ends and are driven using hammering or squeezing. Used for non-structural applications.
- Blind Rivets: Have heads on one end and stems on the other. Inserted in pre-drilled holes and set using rivet guns. Used where access is limited to one side.
- Self-Piercing Rivets: Do not need pre-drilled holes. Drive through stack of materials and head flares to join them. Used to join dissimilar or soft materials.
- Structural Rivets: Have large heads and high shear strength. Used for load-bearing structures like bridges. Made from steel, aluminum etc.
- Semi-Tubular Rivets: Tubular body with large head. Provides leak-proof joint. Used in shipbuilding, boilers etc.
Common materials used for rivets include:
- Aluminum: Lightweight, corrosion resistant and strong. Used for aircraft and other applications.
- Steel: High strength and hardness. Used for load-bearing structures and heavy fabrication.
- Copper: Easy to work and corrosion resistant. Used in building construction.
- Monel: Corrosion resistant nickel-copper alloy. Used in marine applications.
- Titanium: Very strong but expensive. Used in aircraft and high-tech applications.
The material is chosen based on strength, durability, corrosion resistance and cost requirements.
Riveting Tools and Equipment
- Rivet guns: Pneumatic, hydraulic, battery or hand operated. Exert force to deform rivet heads.
- Rivet sets: Shape rivet heads using hammer blows. Come in various head profiles.
- Rivet nuts: Allow riveting thick stacks without buckling. Provides good grip.
- Auto-feed rivet tools: Feed and set rivets automatically for efficiency. Used in mass production.
- Rivet cutters: Cut excess length of bucked rivets. Keep work neat.
- Hole punches: Punch rivet holes accurately instead of drilling. Quicker process.
- Bucking bars: Support set head while deforming shop head during riveting.
- Punching/drilling holes: Accurately space and punch/drill holes for rivets. Ensure hole size matches rivet shank.
- Countersinking: Sink hole to accommodate rivet head profile. Allows flush driving.
- Inserting rivets: Insert rivets in punched/drilled holes. Ensure proper fit.
- Bucking: Hold deformation die or bucking bar against set head. Absorbs force from rivet gun.
- Setting: Use rivet gun or hammer to deform shop head. Fill hole and clamp sheets.
- Forming heads: Use correct profiled rivet set to shape shop head. Match set head shape.
- Cutting stems: Cut excess rivet stem flush with shop head. Makes joint neat.
- Inspecting: Inspect set rivet for defects like cracks, improper seating, underfill etc.
Riveting has many uses in metal fabrication including:
- Aircraft assembly: Riveting aluminum sheets to make lightweight, sturdy aircraft bodies and wings.
- Metal building construction: Riveting studs, girts, roofing sheets etc. in steel buildings.
- Shipbuilding: Riveting hulls, decks and other marine steel fabrication. Resists corrosion.
- Automotive industry: Self-piercing riveting of auto body sheets and structural frames.
- Consumer products: Riveting aluminum sheets in electronics, appliances etc. Allows recycling.
- Steel bridges: Structural riveting provides bolted strength but avoids on-site welding.
- Piping systems: Riveted steel pipe joints are strong, leak-proof and easy to install.
Proper riveting technique produces permanent, vibration resistant and leak-proof joints while avoiding the distortion caused by welding or screws. Understanding the riveting process helps manufacturers assemble high-quality products efficiently. With the growth of automated riveting technology, this time-tested mechanical fastening method continues finding new applications across industries. CNC Milling