Frame the problem correctly
A DFM review should expose geometry that affects tooling, filling, cooling, ejection and inspection before steel is committed.
The goal is not to simplify every part; it is to identify features whose manufacturing consequences are easy to miss in CAD.
A useful DFM review records decisions, not just observations. If a wall is thick because it carries a thread insert, note that functional reason before proposing a core. If an undercut is required by an assembly latch, compare tool actions against alternative latch geometry. Each accepted change should be tied to the drawing revision so the toolmaker, buyer and designer are reviewing the same geometry.
Geometry, material and duty
Review wall transitions, draft, undercuts, ribs/bosses, gate options, parting lines, inserts, cosmetic zones and critical dimensions.
尽可能将这些信息添加到受控图纸、规格说明或询价附件中。避免在非正式的沟通渠道中发布这些信息，有助于供应商比较和后续修改的管理。
Where the risk appears
A generic checklist becomes ineffective when it does not distinguish functional constraints from negotiable geometry.
First-sample evidence
Record each DFM decision against the controlled drawing revision and carry accepted changes into the sample plan.
For Injection Molding DFM Checklist, close the DFM loop by updating the controlled CAD/drawing and sample plan. A recommendation that never reaches the released revision cannot be inspected consistently in production.
Production-release notes
Before requesting a price for injection molding dfm checklist, identify the current drawing revision, production quantity, material constraint and the feature that most strongly affects function. Ask the supplier to flag any deviation from those inputs in the quotation so technical alternatives stay visible.
针对此决策的实用设计审查
Housing DFM starts with a functional wall map. Keep wall transitions deliberate, use ribs and bosses to carry defined loads, provide draft where the tool needs release, and consider how gate and ejection locations interact with cosmetic and dimensional surfaces. The supplier should review these decisions against the selected resin and tool layout.
将假设条件记录在图纸或询价单中，以便供应商在报价前进行确认。如果某个数值未知，应将其标识为待定工程项目，而不是直接复制可能与实际装配不符的通用产品目录编号。
验证工作表
- Nominal wall and transitions
- Rib/boss load path
- Draft and undercuts
- Insert / fastener loads
- Gate / parting / ejector restrictions
- Flatness and critical datums
使用第一个样品，通过尺寸验证和相关的功能检查来确认这些要点。任何可接受的偏差都应在重复生产前的受控修订中记录下来。
