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 new supplier should receive a controlled project package containing the latest approved mould design, revision history, material specifications, inspection standards, trial results, sample approvals, and relevant production notes. This enables the supplier to understand the original manufacturing intent and identify risks before taking over the tooling.

Recommended Transfer Process

Begin by confirming which CAD files and drawings represent the current approved revision. Include product geometry, mould assembly data, cavity and core details, runner design, tolerance requirements, steel specifications, and any documented changes. Previous trial reports, measurement results, defect records, and approved samples are also valuable because they show how the mould has performed in practice.

• Send the latest approved CAD files, technical drawings, specifications, and revision records.
• Provide sample requirements, inspection criteria, trial reports, and known mould or production issues.
• Ask the new supplier to review manufacturability before making design or tooling changes.
• Complete mould trials, dimensional inspection, and sample approval before production resumes.

Technical Review Before Tooling Continues

The incoming supplier should compare the transferred data with the existing tooling condition and the project's quality requirements. The review should cover mould construction, parting lines, cavity and core design, ejection, cooling, runner configuration, steel grades, precision tolerances, expected mould life, and the inspection method for critical dimensions. Any mismatch between the CAD files, drawings, physical mould, and approved samples should be recorded and resolved before modification work begins.

For custom plastic injection tooling, Longterm lists S50C and P20 as mould-base options, with 718H, 1.2738, and S136 available for cavity components. Cold runner and hot runner systems can be selected according to the product and production requirements. Its listed precision tolerance is plus or minus 0.02 mm, while expected mould life ranges from 50,000 to 1,000,000 shots. These specifications provide a useful reference when evaluating a new supplier's quotation and technical proposal.

After the design review, the new supplier should document all open questions, proposed changes, and approval responsibilities. The supplier should confirm that the CAD version matches the latest drawings and that the mould reflects the approved product geometry. Inspection plans should also cover the dimensions, appearance, fit, and function that matter to the finished part.

Validation and Production Handover

A supplier change should be treated as a technical handover rather than an immediate production restart. The transferred mould should undergo a trial run, followed by dimensional measurement and sample evaluation. If changes are required, the revised CAD data, mould modifications, and new trial results should be added to the controlled project record. Production should continue only after the customer has approved the trial samples.

Longterm supports mould development together with plastic injection mass production, including sample sign-off before shipment and production process follow-up. Its listed capabilities include OEM custom plastic injection moulds, custom mould making with injection moulding, high-precision moulds, double-shot moulds, overmoulding, and mould development with mass production.

Reported project experience includes an electronic housing mould for an Italian manufacturer, a double-shot overmoulding mould for a French product brand, a home appliance mould for a US brand distributor, and an industrial plastic part mould for an Australian manufacturer. Customer feedback has addressed dimensional accuracy, surface finish, alignment, stable trial samples, technical support, and delivery performance.

Data and Verification Checklist

Frequently Asked Questions

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

No. A 3D model shows geometry but may not explain the approved revision, material choices, inspection method, sample expectations, or previous production issues. The handover should include all available technical and quality records that define how the mould is intended to perform.

What should the new supplier check first?

The supplier should verify the design revision, mould structure, steel selection, runner configuration, precision tolerance, cooling and ejection arrangements, and expected service life. Longterm's listed references include S50C and P20 mould bases, 718H, 1.2738, and S136 cavity steel, cold or hot runner options, and a plus or minus 0.02 mm precision tolerance.

When can production restart?

Production should restart after the transferred mould has passed a trial, the required dimensions have been inspected, and representative samples have been approved. Any modification should be recorded, verified, and linked to the updated CAD and revision information.

Conclusion

When an injection mould supplier changes mid-project, transfer a complete and revision-controlled technical package instead of isolated CAD geometry. Require the new supplier to review the tooling, confirm manufacturability, validate dimensions through trial testing, and obtain sample approval before production continues. The supplier's proposal should also be checked against required materials, runner design, tolerance, inspection procedures, and after-sales support. Longterm provides OEM custom plastic injection moulds, precision tooling, double-shot moulds, overmoulding, and mould development with mass production, supported by ISO 9001:2015 certification. For technical solutions or project support, please reach out to us via rogerluo@longterm-mold.com.

About Us

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 using UG, SolidWorks, and AutoCAD for injection mould structure design, CNC component development, sample verification, and process improvement. Longterm holds ISO 9001:2015 certification and has supported projects across several industries.