Every mold project starts with a part model and a deadline. The gap between the two is usually closed by assumptions — and assumptions are expensive once steel is on the machine.
A structured DFM review is the cheapest insurance available. Before design freeze, we ask five questions that repeatedly uncover the issues most likely to cause delay, rework or a marginal tool.
1. Is the draft angle real, or only in the model?
Draft is often drawn in the CAD model but lost in a corner, a rib or a texture. A 0.5° draft on a 40 mm deep wall may be theoretically sufficient, but polishing, texturing and tool wear all consume clearance. We check every vertical face against the final surface treatment, not the nominal model.
2. Where will the part stick?
Ejection marks, white stress marks and cracked ribs usually trace back to insufficient ejection area or unbalanced ejection force. At DFM we review the ejector layout, the part stiffness and the expected shrinkage — especially for thin walls and long cores.
3. Does the gate location match the cosmetic requirement?
A gate that fills the part efficiently can still leave a visible mark, a weld line in a high-gloss area, or a flow orientation that warps the part. We map gate location against the cosmetic surfaces and the expected flow front before agreeing the runner layout.
4. Is the tolerance stack-up measurable?
A drawing may specify ±0.01 mm on several features that stack in the same direction. If the measurement method and datum scheme are not defined, the tool can be built correctly and still fail inspection. We agree critical dimensions, datums and gauges at DFM stage.
5. What does the press actually allow?
Mold size, tie-bar spacing, shot capacity, clamp force and ejection stroke all constrain the design. A tool optimized for a 250 T press may not run in the 180 T machine available for production. Sharing the target press early prevents a costly surprise.
Good DFM does not make a project slower. It moves the difficult conversations to a point where changing a line costs minutes, not weeks.
If you have a part model and a target volume, send it over. We will review it against these five questions and return a written DFM report with clear actions.