Custom Stainless Steel Sensor Bracket: A Progressive Die Stamping Case Study from DFM to 20,000-Piece Production

OEM CASE STUDY

Custom Stainless Steel Sensor Bracket: A Progressive Die Stamping Case Study from DFM to 20,000-Piece Production

1. The Challenge: One Stamped Part Must Replace a Four-Piece Welded Assembly

A European industrial automation OEM was redesigning the mounting system of a new generation of position sensors used in washdown and high-vibration environments. The previous design was a four-piece welded assembly: two plates, one tube and a spacer, welded and then re-machined. It was expensive, heavy and suffered from weld distortion that shifted the sensor axis. The OEM's engineering team issued a clear brief for a redesign:

• Produce the bracket as one stamped part in SUS304 stainless steel, 1.2 mm thick, with an integral 105° locating bend.
• Hold ±0.05 mm on the two mounting-hole positions and ±0.10 mm flatness, with burr below 0.05 mm on all edges.
• Withstand a 500 N static load and salt-spray exposure of 96 hours without red rust (neutral salt spray, ISO 9227).
• Initial order of 20,000 pieces, with samples required within 3 weeks and full production within 7 weeks.
• Submit PPAP Level 3 documentation before volume shipment.

The OEM had already failed with one supplier: hole positions drifted by ±0.15 mm during production, burrs damaged the sensor sealing lip during press-fit, and deliveries slipped twice. They needed a partner who could design the tooling, control the process and document everything — not just run a press.

Project Requirements at a Glance

2. Our Solution: DFM Review, In-House Tooling and a Progressive Die Built for Consistency

DEEPLINK's engineering team treated the project as a design-for-manufacturability (DFM) program, not a simple quote. Before cutting steel, we ran a strip-layout study with forming simulation to balance material utilization, bend compensation and die strength.

2.1 DFM Review and Strip Layout

• Re-located the two mounting holes relative to the bend line to keep edge distances within safe limits and eliminate micro-cracking risk in SUS304.
• Added a 0.4 mm overbend compensation so the 105° angle springs back to exactly 105° at 20°C.
• Optimized nesting raised material utilization from 61% to 78%, directly reducing blank cost.
• Recommended laser-cut prototype samples during die build so the customer could fit-test in the first week — we deliver these in as little as 3 days.

2.2 Eight-Station Progressive Die

We designed and built an 8-station progressive die in-house (our tooling shop supports quick-change inserts and in-die sensing):

• Station layout: piloting → forming the locating bend (with overbend) → restrike for springback recovery → precision piercing of mounting holes → coining of the sealing face → trimming → cutoff.
• Carbide (tungsten) inserts on piercing and forming stations for long tool life at 110 SPM.
• Nitrogen die springs and a fixed-strip design that keeps strip position stable, eliminating hole-position drift between stations.
• Tool steel certified and heat-treated in-house, with a documented die try-out and FAI before production release.

2.3 Surface Treatment and Compliance

After stamping, the brackets were electropolished and passivated to remove micro-burrs, brighten the surface and build a passive film that passed the 96-hour salt spray test. All consumables and coatings are RoHS and REACH compliant, supported by material and process certificates.

3. Project Timeline: From RFQ to 20,000 Pieces in 45 Days

4. Quality Control: 39+ Checks per Project, From Material to Packing

Quality was managed as a closed loop under our ISO 9001 system, mirroring the four-stage control described in our metal stamping process guide:

• Incoming material inspection — mill certificates, spectro analysis and surface checks before the coil enters the press.
• First article inspection (FAI) — 39+ dimensional and visual checks per project on the CMM, verified against the customer drawing before batch release.
• In-process control — SPC sampling every 2 hours, GO/NO-GO gauging, and inline CCD optical inspection on mounting-hole position, with automatic rejection of out-of-tolerance parts.
• Final inspection & packaging — AQL sampling, 96-hour salt spray and 500 N load sampling per batch, then protective packing with lot traceability.

5. Results: Measurable Impact for the Customer

Target vs. Delivered

6. Why Global OEMs Choose DEEPLINK for Progressive Die Stamping

This project is typical of how we work, not an exception. As an ISO 9001 certified metal stamping factory with more than 5,000 square meters of workshop, 100+ staff and in-house tooling support, DEEPLINK brings three things that matter most on volume stamping programs:

• Tooling ownership: dies designed and built in-house means faster iteration, lower tooling cost and full control of quality — see what factors affect stamping precision and how we control them.
• Process discipline: documented inspection and traceability from incoming material to final packing, with the consistency controls needed in mass production.
• Flexible volume: high-volume metal stamping with no minimum order quantity — the same engineering team moves you from a single-unit sample to 20,000-piece runs.

For buyers comparing suppliers, we also cover the full process chain under one roof — laser cutting, custom metal stamping parts, sheet metal fabrication, CNC machining and welding — so follow-on operations never need a second vendor.

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