Overview

Titanium spring etching uses photochemical machining to cut fine, compliant spring geometries into thin titanium sheet without mechanical force or a stamping die. A photoresist mask is exposed with the spring artwork, developed, and the unprotected metal is dissolved in a chemistry matched to titanium, so beam width, gap and outline are set by the artwork and etch time rather than tool pressure. Typical substrates are Ti-6Al-4V (Grade 5), CP titanium Gr1/Gr2 and beta-titanium alloys between 0.08 mm and 0.60 mm, chosen for high specific strength, a low elastic modulus that gives generous deflection, and corrosion resistance that holds fatigue life in body-fluid, marine and chemical environments.

For medical, aerospace and connector buyers, titanium spring etching solves three recurring problems: titanium is hard and springy so stamping thin sheet curls, tears and wears dies quickly, fine cantilever and serpentine beams below 0.15 mm are hard to hold with a punch, and titanium is heat-sensitive so laser dross and discoloration become fatigue crack starters. Chemical machining forms every beam on a sheet at the same rate, holding width and gap consistent from the first sample through volume production, while keeping the part flat, burr-free and free of the heat-affected zone that shortens a cycling spring's life.

Parameter Window

• Available Materials: Ti-6Al-4V (Grade 5), CP titanium Gr1/Gr2, beta-titanium, nickel-titanium; also stainless and nickel for mixed builds
• Material Thickness Range: 0.08–0.60 mm
• Tolerance: ±0.02 mm on beam width, ±0.03 mm on outline and gap
• Minimum Feature: 0.12 mm spring beam width, 0.10 mm gap/clearance
• Surface Options: acid pickling & passivation, anodized color coding, electropolishing, light sandblast, stress-relief anneal, ultrasonic cleaning
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Nesting — Convert the spring beams to vector art, check beam-to-thickness and gap rules, and lay out panels with shared registration marks.
2. Material Certification & Prep — Verify grade, mill certificate and thickness, inspect for scratches and flatness, then shear to exposure size.
3. Cleaning & Lamination — Degrease and laminate dry-film resist under matched heat and pressure so no bubbles sit under fine beams.
4. UV Exposure — Expose through high-resolution film with the spring pattern registered to the sheet edge for panel-level beam consistency.
5. Development — Wash out unexposed resist to open the gap areas and inspect for residue that would bridge or blunt a beam.
6. Controlled Etching — Spray titanium-matched chemistry, tuning time, temperature and conveyor speed to hold sidewalls and avoid beam thinning.
7. Stripping & Passivation — Remove resist, neutralize, then pickle/passivate or anodize, and apply a controlled stress-relief anneal.
8. Inspection & Packaging — Measure beam width, gap and outline on a vision system, verify flatness and spring-back, then pack on liner.

Core Advantages

1. Burr-free beams: Chemical removal leaves no rolled edge or heat-affected zone, removing the crack starters that shorten a cycling spring's life.
2. No die cost: Each spring layout is a new film, keeping prototypes and frequent design revisions economical without a stamping tool.
3. High elastic deflection: Titanium's low modulus and high strength give generous, repeatable travel in a thin, lightweight beam.
4. Long corrosion fatigue life: The passive oxide resists chlorides and body fluids, suiting long-life medical and marine spring duty.
5. Stress-free flatness: With no shear or heat input, thin sheet stays flat, so forming, heat-setting or bonding will not warp the beams.
6. Repeatable custom geometry: titanium spring etching can combine cantilevers, serpentine beams and contact pads on one part, reproduced from first article to volume.

Typical Applications

• Medical device clips: Lightweight, corrosion-resistant elastic clips and retention springs for surgical instruments and implants.
• Aerospace lightweight springs: Mass-saving latch, lock and damping springs for airborne equipment.
• Connector contact springs: Compliant contact beams in high-reliability electrical connectors and sockets.
• Sensor elastic elements: Force and displacement sensing beams in transducers and micro-switches.
• Eyewear & consumer hinges: Thin, springy hinge and temple elements that resist sweat and corrosion.
• MEMS micro-springs: Fine suspension beams for micro-mirrors, accelerometers and micro-actuators.

Design Notes & Process Considerations

1. Beam-to-thickness ratio: Keep beam width at or above roughly the sheet thickness; narrow beams in thick stock distort from undercut and thin out.
2. Spring rate callout: State beam width, length, thickness and target stiffness or deflection, since these set the force-deflection curve.
3. Grade selection: Choose Grade 5 for strength, Gr1/Gr2 for formability, or nickel-titanium for shape-memory behavior, and note the certificate needs.
4. Surface and fatigue: Define passivation, anodize and electropolish level, as surface finish strongly affects fatigue life on a cycling spring.
5. Nesting and tie bars: Leave adequate tie bars and process borders, and specify final singulation so fine beams survive stripping and heat-setting.
6. Handling and cleanliness: With titanium spring etching, specify liner packaging, flatness, residual-ion limits and spring-back inspection for medical and battery parts.