Quick answer: The steel-release review is a cross-functional decision gate, not a CAD presentation. Confirm one product and resin basis, close DFM actions, trace each critical requirement to mold features and validation, prove feed, venting, cooling, ejection and machine interfaces, and record open risks with owners. Release only the components whose inputs are stable enough to cut.
Release Decision Matrix
| Review stream | Approval evidence | Stop-release condition |
|---|---|---|
| Product basis | Released CAD/drawing, resin, shrinkage, CTQs and cosmetics | Conflicting revision or undefined requirement |
| Molding concept | Cavities, feed, parting, actions, vents and ejection | Unresolved feasibility or damage mechanism |
| Thermal/system | Cooling circuits, analysis/rationale and machine interface | No route to stable cycle or compatible press |
| Validation/change | T1 plan, measurements, samples, steel-safe and approval matrix | No acceptance method or unowned high risk |
Approval Checklist
- Confirm one released product, resin and shrinkage basis.
- Trace CTQs, cosmetics and assembly needs to mold decisions.
- Close parting, action, gate, runner and vent risks.
- Review cooling performance and trial measurement points.
- Prove ejection, handling and complete motion sequence.
- Verify steels, components, support, access and spares.
- Overlay all destination machine and utility interfaces.
- Approve T1, steel-safe, change-control and open-risk records.
Freeze the Review Basis
List product CAD and drawing revision, units, resin grade, color/additives, shrinkage basis, annual volume, expected life, cavity count, machine and regulatory or customer requirements. Resolve conflicts between model, drawing, purchase information and DFM record.
Mark CTQs, datums, cosmetic zones, no-gate/no-ejector areas, assembly interfaces and conditioning requirements. The team cannot approve a tool against adjectives such as good appearance or tight tolerance without an evaluation method.
Close Product and Parting Decisions
Review draft, shutoffs, undercuts, steel-safe intent, wall transitions, ribs, bosses and expected deformation. Trace every side action and lifter to its product feature and operating sequence. Confirm where witness, mismatch and flash limits will be assessed.
Inspect parting surfaces through realistic opening and closing motion. Protect thin steel, texture boundaries and sealing lands. Assign unresolved product concessions explicitly instead of letting the mold design silently absorb them.
Review Feed, Venting and Cavity Balance
Confirm sprue or hot-runner interface, runner sizing basis, gate type, location, vestige, access and removal. Review flow length, weld locations, pressure demand and cavity-to-cavity balance using analysis or documented engineering rationale appropriate to risk.
Map expected last-to-fill areas and provide maintainable vent paths. Include inserts, ejector clearances or vacuum only when the design and maintenance plan support them. A vent callout without access or cleaning criteria is incomplete.
Prove Cooling and Ejection
Review circuit routes, spacing, flow path, connectors, pressure test and interference with fasteners or actions. Identify hot regions around deep cores, thick sections and slides and show how temperature will be checked during trials.
Evaluate release direction, texture drag, vacuum, ejector contact stress, balance and part handling. Simulate the full sequence with side actions and robot where relevant. Confirm that ejector marks and deformation can be evaluated against requirements.
Confirm Construction and Machine Integration
Review steel and hardness by wear, polish, corrosion, resin and repair need. Check inserts, replaceable wear components, support, guidance, fasteners, lifting and service access. Align purchased-component specifications and spare strategy with the BOM.
Overlay the destination machine: tie bars, platen, nozzle, locating, clamp, opening, ejection, utilities and automation. Document assumptions for any secondary machine and the qualification required after a move.
Release With a Validation and Change Plan
Define T1 objectives, sample quantity, cavities, resin, process records, dimensional layout, appearance method, assembly tests and report timing. Identify steel-safe dimensions and the evidence required before correction. Distinguish design validation from process capability work.
Log each decision, open point, owner, due date and affected component. Partial release can be controlled when stable plates proceed and risk-sensitive inserts remain blocked. Any later change must update impacted drawings, BOM, programs, inspection and as-built records.
Illustrative Conditional Steel Release
Illustrative engineering example—not a claimed CKMOLD customer result: The mold base and cooling layout are approved, but the customer has not resolved a connector datum that controls a cavity insert. The team releases only unaffected base work, blocks the insert and records schedule impact. This avoids cutting critical geometry to an unapproved product revision while preserving useful progress.
Supporting Review Resources
Questions Before Approval
Who should attend a steel-release review?
At minimum include product, mold design, manufacturing, molding/process, quality and the buyer or authorized product decision maker.
Can part of a mold be released early?
Yes, when interfaces and revision control are clear and risk-sensitive components remain formally blocked with owners and schedule impact recorded.
Is mold flow analysis generally required?
Use analysis proportionate to geometry, material, cavities and consequence; whether simulated or reasoned, feed, balance, pressure, weld and air risks still need evidence.
What makes a review approval auditable?
A fixed input revision, decision log, closed actions, named approvers, open-risk disposition and controlled released drawing and BOM package.
Apply the Injection Mold Design Review Gate Before Steel Release review to your released design. Share the function, exact resin, annual volume, CTQs, cosmetic limits and launch timing through the CKMOLD project form. If CAD is relevant, send it directly to jerry@ckmold.com; the form does not require an upload.