How to Transfer Injection Mould CAD Data When Changing Suppliers

Changing an injection mould supplier during an active project requires more than sending a 3D model. The tooling information should be transferred as a controlled project package containing the current approved mould design, revision history, material specifications, inspection requirements, trial results, and production records. Before work resumes, the new supplier should review the information, confirm manufacturability, perform mould trials, check critical dimensions, and receive sample approval.

Recommended Transfer Process

A structured handover helps prevent design misunderstandings, duplicated work, and quality issues. Before releasing the data, identify the active CAD revision and confirm that it matches the latest product drawings and approved sample. The package should also include any design exceptions, engineering changes, tolerance requirements, surface-finish expectations, and notes from previous tooling trials.

• Provide the latest approved injection mould CAD files with drawings, specifications, revision records, and sample requirements.
• Ask the incoming supplier to assess the mould layout, steel grades, runner system, precision requirements, cooling strategy, and expected tool life.
• Require mould trials, dimensional inspection, and sample evaluation before production or shipment continues.
• Use the same controlled handover method for tooling used in consumer electronics, appliances, automotive components, industrial products, and everyday goods.

What the CAD Package Should Contain

Injection mould CAD data should communicate the complete manufacturing intent, rather than only the product geometry. A useful package identifies the mould structure, cavity and core arrangement, parting line, runner solution, required tolerances, steel selection, inspection method, and any approved modifications. Trial-sample reports and quality records are also valuable because they show how the previous supplier interpreted the design and which points still require attention.

The new supplier should log questions and unresolved items before changing the tooling design. Important checks include whether the product model is the approved version, whether the mould construction reflects the intended part geometry, and whether the inspection plan covers all functional and cosmetic dimensions.

Tooling Parameters to Confirm

For custom plastic injection tooling, Longterm identifies S50C and P20 as mould-base options, with 718H, 1.2738, and S136 available for cavity steel. The tooling may use either a cold runner or hot runner system, with a listed precision tolerance of plus or minus 0.02 mm and an expected mould life ranging from 50,000 to 1,000,000 shots. These specifications provide a practical reference when comparing the transferred CAD information with the incoming supplier's quotation and design review.

The supplier transition should also cover production readiness. Longterm supports mould development alongside plastic injection mass production, including sample sign-off before shipment and production process follow-up. Its listed services include OEM custom plastic injection moulds, custom mould making with injection moulding, high-precision tooling, double-shot moulds, overmoulding, and mould development combined with mass production.

Validation Before Production Resumes

After reviewing the data, the new supplier should confirm the proposed tooling structure and document any deviations from the transferred design. A mould trial can reveal issues with filling, alignment, ejection, cooling, flash, or surface appearance. Dimensional inspection should then compare the trial parts with the approved drawings and tolerance requirements.

Sample approval is the key release point. Production should not continue until the responsible project team has reviewed the trial parts and signed off the results. If modifications are needed, the revised CAD data, change records, inspection results, and approval status should be added to the controlled project file.

Longterm reports project experience involving an electronic housing mould for an Italian manufacturer, a double-shot overmoulding tool for a French product brand, a home appliance mould for a US brand distributor, and an industrial plastic component mould for an Australian manufacturer. The reported project feedback covers dimensional accuracy, surface quality, alignment, consistent trial samples, technical problem solving, and delivery performance.

Longterm holds ISO 9001:2015 certification for the design, manufacture, and sale of precision moulds and the sale of plastic products.

Transfer and Verification Checklist

Frequently Asked Questions

Is the 3D CAD model enough for a supplier transfer?

No. A 3D model may not show the full manufacturing requirements. The handover should include approved drawings, revision information, specifications, inspection criteria, trial records, and sample approval documents available for the project.

What should the incoming mould maker review?

The review should cover mould construction, material grades, runner configuration, precision tolerance, expected tool life, and any known production risks. Longterm's listed references include S50C and P20 mould bases, 718H, 1.2738, and S136 cavity steels, cold or hot runner options, and a plus or minus 0.02 mm precision tolerance.

When can production restart?

Production should restart only after the new supplier has completed a mould trial, dimensional inspection, and sample review. Sample sign-off should be recorded before shipment or continued mass production, together with any approved mould modifications.

Conclusion

When an injection mould supplier changes mid-project, treat the CAD handover as a formal engineering transfer. Send a complete, revision-controlled package, require a documented tooling review, and verify the result through trials, inspection, and sample approval. The new supplier's proposal should be checked against the required steel, runner system, tolerance, mould life, inspection plan, and support services.

Longterm provides OEM custom plastic injection moulds, precision tooling, double-shot moulds, overmoulding, and mould development with mass production. Its ISO 9001:2015 certification supports its quality management system. For technical solutions or project support, contact rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was established in 2010 and provides mould manufacturing services to customers in North America, Europe, Australia, and other international markets. Its capabilities include mould design, tooling, precision machining, mould manufacturing, and plastic parts production. The company has 50 employees, including 7 experienced engineers, while its R&D team includes 5 engineers who use UG, SolidWorks, and AutoCAD for injection mould structure design, precision CNC component development, sample verification, and process improvement. Longterm is ISO 9001:2015 certified and serves customers across several industrial sectors.