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Quality is a record, not a promise

Every dimension we claim has a reading behind it, every part a lot number, and every lot a document set you can file. Here is exactly what gets measured and what gets handed over.

Quality control at Jingcheng Mold means three things in practice: inspection happens during machining rather than only after it, readings are recorded against the drawing revision they were measured, and the resulting records travel with the parts. If a feature cannot be verified with the equipment we hold, we say so at quotation stage instead of discovering it at final inspection.

Inspection plan

What gets checked, and how

Inspection methods by feature type
Feature	Method	Typical capability	Record
Critical dimensions	CMM, temperature-compensated	±0.005 mm	Actual reading per feature
Bores and diameters	Bore gauge, pin gauge, micrometer	±0.005 mm	Actual reading with gauge ID
Flatness and parallelism	CMM or surface plate with indicator	0.01 mm	Reported as form value
Surface roughness	Portable roughness tester	Ra 0.4 µm	Ra value plus cut-off setting
Mold fit and shut-off	Blue check, feeler gauge, press trial	Contact pattern full face	Trial report with photos
Appearance (cosmetic parts)	Visual against limit sample, gloss meter	SPI A1–C3	Per-cavity appearance check
Material grade	Mill or resin certificate review	Certificate on file	Certificate matched to lot

Capability figures are typical values for the named method, not a guarantee for every geometry. A thin wall, a deep rib or a difficult datum can reduce what is achievable — we state the realistic figure in the quotation.

Checks by stage

Incoming materialBefore cutting
Steel and resin certificates are checked against the ordered grade and filed with the job number.
In-processDuring machining
Critical features are checked as setups complete, so a drift is corrected before the next operation builds on it.
First articleBefore the run
Every ballooned feature on the drawing is measured and recorded once, with the datum scheme stated.
In-run samplingDuring production
Sampling frequency follows your plan, or a default of five parts per shift per cavity.
Final and packingBefore shipment
Final dimensional check, visual check, packing method and label review, then the document set is assembled.

Records you receive

First article inspection report with actual readings against the ballooned drawing
CMM report stating the datum scheme and the program revision used
In-process and sampling records for the lot
Material certificates matched to the lot number
Certificate of conformity against the drawing revision you supplied
Mold trial report with process parameters, for tooling orders
Tool history file listing every change after tryout
Photographs of the finished cavity, core and ejection layout for tooling orders

When something is out of tolerance

Hold

The lot is stopped; nothing moves to packing while a deviation is open

Find the cause

Tool wear, program error, material batch or setup — identified before any rework

Tell you first

You receive the finding, the reading and the proposed route before we act

Correct or deviate

Rework, remake, or a written deviation with your agreement — never a shipment on assumption

Record the closure

The corrected reading and the reason are added to the lot record

Ask about a specific record

Quality FAQ

Can I see the CMM report before shipment?

Yes. The inspection report is sent for review before the parts are packed. If a reading falls outside the drawing, we tell you before shipment rather than after, and propose either a correction or a written deviation for your decision.

What happens when a dimension is out of tolerance?

The lot is held. We identify the cause, decide whether the feature can be corrected, and send you the finding with a proposed route. Nothing ships on a deviation without your written agreement.

Are you certified to ISO 9001 or IATF 16949?

We state our current certifications in writing with the quotation rather than making a general claim on this page. If a program requires a specific certificate or a customer audit, raise it at the enquiry stage so we can confirm feasibility before you plan around it.

Do you keep records after shipment?

Inspection and material records are retained for three years by default, longer if your contract requires it. Give us the lot number and we can retrieve the record for that shipment.

Ask what a dimension claim actually rests on

Send a drawing and we will tell you which features we can verify, with what equipment, and what the report will contain.

Request a quote