Die Casting Tool Transfer and Quality Recovery

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

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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.

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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.

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Recovery Plan

KastMfg proposed a staged recovery plan:

1. Clean and inspect all vents
2. Polish the visible cosmetic surfaces
3. Repair worn parting line area
4. Trial cast with controlled process parameters
5. Sort samples before plating
6. Approve plated samples before mass production
7. Add in-process flash checks at the critical locking feature

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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

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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.

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Tool transfer inquiry: yaoqingpu1983@gmail.com | +86 138 1403 4409 | No.6, Rungu Road, Nanjing, China