Tiếng Việt
English
日本語
An injection mould DFM checklist helps technical teams identify open issues before the mould structure is approved. At HA NOI MOULD TECHNOLOGY COMPANY LIMITED, DFM information is used to clarify product data, material, appearance, mould mechanisms and production conditions before detailed mould design begins.
What is injection mould DFM?
Design for Manufacturing reviews whether a product design can be tooled and injection moulded as intended. The purpose is not to change the product without approval. It is to identify items that may affect filling, shrinkage, venting, part release, appearance, stability and mould maintenance. Proposed changes should be reviewed and confirmed by the relevant project teams.
Input data to prepare
- 3D data: the latest geometry file with confirmed units.
- 2D drawing: critical dimensions, tolerances, assembly interfaces and technical notes.
- Plastic material: resin family, specified grade when available, colour, additives and product-related requirements.
- Surface requirements: appearance areas, gloss, texture, marking, logo and areas where visible marks are restricted.
- Quantity and schedule: expected volume, sample requirements and project milestones.
- Use conditions: part function, assembly position, loads and operating environment when relevant.
DFM checklist before mould design
- Data revision: confirm that the 2D and 3D files use the same revision, units and design intent.
- Wall thickness: identify thickness transitions, material concentrations and areas that may require closer review for sink or uneven cooling.
- Ribs, bosses and joints: review their relationship to surrounding walls and assembly requirements.
- Draft: check surfaces in the mould-opening direction, especially textured areas, deep walls and surfaces sensitive to drag marks.
- Parting line: propose a location based on geometry, appearance, machining access and part release.
- Undercuts and mechanisms: identify side holes, retaining features and other geometry that may require slides, lifters or another agreed solution.
- Gate and runner: discuss gate location, acceptable gate vestige, expected flow direction and the runner requirement defined for the project.
- Venting: identify end-of-fill areas, potential weld regions and locations that need priority during vent review.
- Ejection: define areas where ejector pins, plates or other mechanisms can act without affecting critical functional or appearance surfaces.
- Cooling: review thick regions, deep cores and restricted geometry to guide cooling layout before detailed design.
- Critical dimensions: classify dimensions for inspection, identify datums and agree how samples will be evaluated after the mould trial.
- Machine conditions and component standards: provide the intended machine interface, connector, electrical, hydraulic and component-standard requirements when specified.
Expected DFM outputs
A DFM review can close with an open-item list, annotated images and a record of agreed decisions. Typical decisions cover mould-opening direction, parting line, undercuts, gate location, ejection, appearance areas, inspection dimensions and any missing technical inputs.
When should mould design remain open?
Detailed design should not be frozen while 2D and 3D data conflict, the plastic material is unconfirmed, critical tolerances are unclear, appearance requirements are incomplete or product changes remain open. HANOI MOULD can consolidate technical questions for confirmation before the next step.
Next step
See the plastic injection mould design and manufacturing process for the sequence from DFM through mould trials and handover. To prepare a technical review package, use the injection mould RFQ data checklist.
