Automotive Tier 1 Vibration Damper Family — 68k pcs/yr

The challenge

A Fortune 500-caliber automotive Tier 1 OEM — the tier of buyer that supplies engine mounts and vibration dampers to global OEM assembly plants and publishes case studies with Trelleborg, Freudenberg-Sealing, or Vibracoustic — needed a qualified second-source for a 5-SKU HTV silicone damper family during a mid-cycle vehicle refresh. The incumbent European supplier had missed a PPAP Level 3 re-submission window after a compound-house consolidation event drifted their Shore A baseline by 4 points across two production campaigns, invalidating the customer's NVH sign-off and forcing an emergency re-qualification. The customer's supplier-quality office needed a second source that could carry IATF 16949-adjacent PPAP Level 3 discipline, submit a full 5-phase APQP deliverable set on a 45-day gate-to-gate schedule, prove dimensional Cpk ≥ 1.67 on the critical damper ID/OD across a 30-piece first-article layout, and validate dynamic stiffness Kdyn and loss factor tan δ against measured NVH targets on an MTS 831 elastomer test rig — all before releasing a 500-piece pilot PO. The buyer-side risk was a 3-month vehicle-program schedule slip if the second-source qualification stalled at PSW sign-off.

How we approached it

We qualified an HTV silicone (VMQ) compound at Shore A 55 ±3 per ASTM D2000 M2GE507 A14 B14 EA14 against the customer's spec window (−40 °C to +200 °C under-hood continuous, ozone and salt-spray gates on the bonded-metal cores). APQP phase gates ran on the customer's 45-day schedule: design freeze on day 5 after DFM annotation delivery, DVP&R matrix locked on day 12, tool kick-off on day 15, first-article off-tool on day 32, PPAP Level 3 submission on day 45. DOE across three cure profiles (170/175/180 °C × 4/5/6 min) locked cycle time at 175 °C × 5 min as the sweet spot between compression set (18–22% per ASTM D395 Method B at 22 h × 175 °C) and 8-cavity tool throughput. Hardened P20 compression tool with cavity-ID marking on every part — a 15-year batch-traceability requirement the incumbent had been running as a paper log rather than a molded feature. Dimensional capability study on the 30-piece first-article layout: Cpk 1.82 on critical damper ID, Cpk 1.71 on OD, both verified on a Zeiss Contura CMM with gauge R&R under 10%. NVH validation on an MTS 831 elastomer test rig: dynamic stiffness Kdyn 340 N/mm at 100 Hz, loss factor tan δ 0.11 at 25 °C, sweep-frequency 10–500 Hz retained with the PPAP binder. Durability qualification: heat aging 150 °C × 1000 h (Shore A drift 3 points, tensile retention 84% per ASTM D573), ozone 50 pphm × 72 h no cracking per ASTM D1149, salt spray 96 h on bonded-metal cores per ASTM B117, 10⁶-cycle fatigue at ±2 mm with no crack initiation. Full PPAP element list (18 elements per AIAG PPAP 4th ed.) submitted and PSW signed on first pass with zero rejections.

Outcome

Two years of running production. 24-month scoreboard: 187 PPM defect rate across all 5 SKUs, 99.1% on-time delivery FOB Yantian to the Tier-1 assembly plant, and a ramp curve that walked from a 500-piece pilot at 4.8% scrap through a 5,000-piece EOP validation at 1.6% scrap to steady-state production at 5,700 pieces per month with 0.9% scrap. The customer's supplier-quality office signed the PSW on first submission — zero PPAP rejections, zero re-submission cycles, and the NVH sign-off held through both mid-cycle vehicle refreshes during the program window. Kanban pull against a 4-week rolling forecast with ASN/EDI to the Tier-1 assembly plant, packaging DFMEA locked at PPAP Level 3, and container consolidation cadenced weekly out of Yantian Port. All 15-year batch records — cavity-ID by production date, material COA by drum lot, cure-profile chart by press shift — retained per the customer's IATF 16949-adjacent QMS. Cost-down mechanism disclosed in the year-1 review: the 8-cavity compression tool cut cycle-time-per-part 38% versus the incumbent's 4-cavity setup, and the 175 °C × 5 min cure profile from the DOE cut oven dwell 22% versus the incumbent's conservative 180 °C × 6 min profile. Program is ongoing at ~68,000 pcs/yr and the customer's advanced-purchasing team has asked us to quote a sixth SKU — a bonded-metal transmission mount — under the same PPAP Level 3 discipline for the next-generation vehicle platform.