Case Study: Tool Transfer and Quality Recovery
How KastMfg onboarded transferred die casting tooling, corrected process instability, restored first article approval, and restarted production for an export buyer.
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Customer: UK equipment manufacturer Program: Zinc die cast lock housing Annual volume: 120,000 pieces/year Material: Zamak 5 Scope: Tool audit, hot-chamber die casting, plating coordination, inspection, export packing
The Buyer Situation
The buyer's previous supplier had rising rejection rates on plated parts. The main complaints were flash at the parting line, inconsistent cosmetic finish, and occasional assembly interference around a locking feature.
Because the tool was customer-owned, the buyer decided to transfer the die rather than build a new tool immediately.
Tool Audit Findings
KastMfg inspected the incoming tool and found:
- Parting line wear in one cavity area
- Ejector pin witness marks close to a visible surface
- Inconsistent vent cleaning records
- Minor buildup near a thin locking feature
- No reliable shot count history from the previous supplier
The tool was repairable, but it needed refurbishment before production restart.
Recovery Plan
KastMfg proposed a staged recovery plan:
- Clean and inspect all vents
- Polish the visible cosmetic surfaces
- Repair worn parting line area
- Trial cast with controlled process parameters
- Sort samples before plating
- Approve plated samples before mass production
- Add in-process flash checks at the critical locking feature
Results
| Metric | Result |
|---|---|
| Tool status | Existing tool recovered without new tooling |
| First article result | Approved after refurbishment and plated sample review |
| Cosmetic complaints | Reduced after surface and vent maintenance |
| Assembly issue | Controlled with added in-process gauge check |
| Supply continuity | Production restarted without a full new mold program |
Procurement Lesson
Transferred tooling should never move directly into production without inspection. A short tool audit can reveal whether the issue is process control, tool wear, plating preparation, or part design. This keeps the buyer from paying for new tooling before understanding the real failure mode.
For buyer guidance, see die casting tooling ownership and die casting tool transfer.
Tool transfer inquiry: yaoqingpu1983@gmail.com | +86 138 1403 4409 | No.6, Rungu Road, Nanjing, China
Related Resources
Next steps for die casting tool transfer quality recovery
Case Study: Supplier Switch Reduced Finished Part Cost
How KastMfg helped an industrial equipment buyer switch die casting suppliers, stabilize quality, and reduce finished component cost through tooling review and in-house machining.
CapabilityQuality Control
Review inspection workflow, traceability support, and process control standards before launch.
Process GuideDie Casting Process
See how casting, trimming, machining, finishing, and inspection fit together in production.
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