Analysis Of Custom Brass Sheet Metal Stamping And Bronze Stamped Parts For Electrical Switches, Relays, And Terminals

C2680 brass and phosphor bronze are widely used in Brass Sheet Metal Stamping for electrical terminals, spring contacts, relay components, connector parts, and switch components. Material selection, progressive die design, plating control, springback compensation, and burr management directly affect contact force, dimensional accuracy, and long-term electrical connection performance.

 

 

C2680 brass provides a practical balance of electrical conductivity, ductility, and stamping formability. It is suitable for terminals, conductive connectors, switch components, and formed electrical parts.

 

Phosphor bronze provides better elastic recovery and fatigue resistance, making it suitable for spring contacts and components that require repeated insertion, compression, or switching.

 

Material	Main Characteristics	Typical Parts
C2680 Brass	Good conductivity and formability	Terminals, connectors, switch parts
Phosphor Bronze	Elastic recovery and fatigue resistance	Spring contacts, relay terminals
C1100 Copper	Very high electrical conductivity	Conductive plates, terminals

 

Material thickness, temper, grain direction, and mechanical properties should be considered during die and forming design.

 

 

High-speed progressive stamping can combine piercing, blanking, bending, forming, coining production sequence.

Key process variables include:

 

• Strip feeding pitch and positioning accuracy
• Pilot positioning
• Bend radius and forming height
• Springback compensation
• Tool wear and alignment
• Material thickness consistency

 

Trial stamping is used to verify hole position, bend angle, contact height, flatness, and other critical dimensions before mass production.

 

 

Springback is affected by material temper, thickness, bend radius, grain direction, and forming sequence. For precision terminals and spring contacts, the forming process should account for the material's elastic recovery before final tooling release.

 

Burr formation is controlled through:

 

• Punch and die clearance
• Tool edge condition
• Punch-to-die alignment
• Material hardness and thickness
• Cutting sequence
• Tool maintenance intervals

 

Critical dimensions can be verified using optical measurement, gauges, or CMM inspection. Burr height requirements should be defined according to the customer's assembly and electrical-contact requirements.

 

 

Surface plating is selected according to contact current, mating frequency, corrosion conditions, soldering requirements, and electrical interface requirements for Brass Sheet Metal Stamping.

 

Plating	Main Function	Typical Application
Silver	High electrical conductivity	Power contacts and switches
Gold	Stable contact interface	Signal terminals and low-current contacts
Tin	Solderability and corrosion protection	Electrical terminals

 

Selective plating can restrict the coating to functional contact areas, reducing precious-metal consumption. XRF testing can be used for non-destructive coating-thickness verification, while cross-sectional analysis can verify individual plating layers.

 

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Stamped brass and bronze components can be designed with integrated holes, slots, tabs, contact areas, spring sections, and formed connection points.

 

For switch and relay applications, the key engineering parameters normally include:

 

• Contact position and contact height
• Spring force and displacement
• Terminal insertion dimensions
• Hole and slot tolerances
• Flatness after forming
• Burr height
• Plating coverage and thickness

 

For components requiring repeated mechanical movement, spring force and permanent deformation should be evaluated together rather than relying only on dimensional inspection.

 

 

A production quality plan can include material verification, dimensional inspection, plating measurement, spring-force testing, and final visual inspection.

 

Typical controls include:

 

• Material grade and thickness verification
• First-piece and in-process dimensional inspection
• CMM measurement for critical geometry
• Optical inspection for burrs and surface defects
• XRF plating-thickness measurement
• Spring force and displacement testing
• Lot identification and production traceability

 

For automotive projects, documentation can be aligned with IATF 16949, APQP, PPAP, PFMEA, Control Plan, MSA, and SPC requirements where specified by the customer.

 

 

The manufacturing workflow can be organized as:

 

2D/3D Drawing Review → DFM Analysis → Material Selection → Progressive Die Design → Tool Trial → Sample Inspection → Customer Validation → Mass Production

 

For early-stage projects, laser cutting or CNC machining can be used for prototype parts before production tooling is completed. This allows engineers to verify installation dimensions and assembly interfaces before progressive die investment.

 

For production tooling, die design can integrate multiple operations to reduce secondary processing and maintain consistent part positioning throughout the stamping sequence.

 

 

Custom Brass Sheet Metal Stamping are commonly specified for:

 

• Electrical Switches: terminals, conductive parts, spring contacts, and connection components
• Relays: static terminals, dynamic spring assemblies, and conductive supports
• Contactors: terminals, contact supports, and current-carrying components
• Connectors: stamped terminals and mating interfaces
• Automotive Electrical Systems: connection terminals and switching components
• Industrial Controls: relay terminals, switch components, and conductive structural parts

 

Material, geometry, plating, and spring characteristics should be selected according to the actual electrical load, mechanical cycle requirements, and assembly conditions.

 

 

 

 

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