Mold Design Course

Lesson 1 • Part Geometry and Moldability

Analyzes how wall thickness, draft, and undercuts affect moldability. Students evaluate a part design for basic manufacturability before detailing the mold.

Lesson 2 • Industry Standards and Documentation

Introduces mold classification systems, drawing standards, and design documentation practices. Proper documentation ensures consistent communication with toolmakers and customers.

Lesson 3 • Mold Anatomy and Terminology

Identifies and names every major mold assembly and sub-assembly. Shared vocabulary enables precise communication throughout the course.

Lesson 4 • Injection Molding Process Overview

Covers the full injection molding cycle from material plasticization to part ejection. Establishes process context that informs every subsequent design decision.

Lesson 1 • Cavity and Core Tolerancing

Applies shrinkage allowances and dimensional tolerances to cavity and core geometry. Accurate tolerancing ensures molded parts meet drawing specifications.

Lesson 2 • Mold Base Selection and Sizing

Guides selection of standard mold base sizes and plate configurations. A correctly sized mold base reduces custom machining and lead time.

Lesson 3 • Single-Cavity Mold Configuration

Establishes cavity and core block sizing for a single-impression mold. Proper block dimensions ensure structural integrity under clamp and injection forces.

Lesson 4 • Multi-Cavity Layout Strategies

Covers balanced and unbalanced cavity arrangements and their trade-offs. Students select cavity count and layout based on production volume and press size.

Lesson 1 • Gate Sizing and Pressure Calculations

Applies rheological principles to size gates for target fill time and pressure. Correctly sized gates prevent premature freeze-off and excessive shear heating.

Lesson 2 • Gate Types and Selection

Surveys edge, submarine, pin, fan, and film gate geometries and their applications. Gate selection affects fill pattern, vestige, and part aesthetics.

Lesson 3 • Balanced Runner Design

Demonstrates naturally and artificially balanced runner layouts for multi-cavity molds. Balanced fill ensures uniform part quality across all cavities.

Lesson 4 • Hot Runner System Integration

Covers manifold design, nozzle selection, and thermal control for hot runner systems. Proper integration eliminates cold slugs and reduces material degradation.

Lesson 1 • Conformal Cooling Design

Introduces cooling channels that follow cavity contours, enabled by additive manufacturing. Conformal cooling reduces cycle time and warpage on complex geometries.

Lesson 2 • Heat Transfer Fundamentals in Molds

Quantifies heat input from the melt and the cooling capacity needed to extract it. Thermal analysis provides the basis for all cooling circuit decisions.

Lesson 3 • Thermal Simulation and Validation

Uses mold-flow thermal analysis to predict temperature distribution and cycle time. Simulation results guide iterative refinement before cutting steel.

Lesson 4 • Coolant Flow and Pressure Analysis

Calculates flow rate, Reynolds number, and pressure drop to ensure turbulent flow. Turbulent flow maximizes heat transfer efficiency in cooling circuits.

Lesson 1 • Stripper Plate and Ring Ejection

Applies stripper plate and stripper ring designs for parts with large perimeter contact. These systems distribute ejection force across the full part perimeter.

Lesson 2 • Ejector Pin Systems

Covers standard, blade, and sleeve ejector pin types and their layout rules. Pin placement must distribute force evenly to prevent part warpage during ejection.

Lesson 3 • Air-Assist and Robotic Ejection

Introduces air-assist valves and robotic part removal for delicate or deep-draw parts. These methods supplement mechanical ejection to reduce cycle time and part damage.

Lesson 4 • Ejector System Timing and Sequencing

Designs ejector plate travel, stroke, and sequenced ejection for complex parts. Correct sequencing prevents interference between ejectors and moving mold components.

Lesson 1 • Collapsible Cores and Unscrewing Mechanisms

Applies collapsible core segments and rack-and-pinion unscrewing for threaded or deep internal features. These mechanisms handle undercuts that lifters cannot reach.

Lesson 2 • Lifter Design for Internal Undercuts

Designs angled lifter pins and lifter blades that retract during ejection to clear internal undercuts. Lifter geometry must avoid interference with ejector pins.

Lesson 3 • Undercut Classification and Strategy

Categorizes external and internal undercuts and maps each to appropriate release mechanisms. Early undercut identification prevents costly mold redesign.

Lesson 4 • Side-Action Timing and Interference Analysis

Sequences slide retraction, core pull, and ejection to prevent mechanical interference. A complete motion study validates the design before mold fabrication.

Lesson 1 • Design for Mold Maintenance

Incorporates access features, wear inserts, and modular components to simplify maintenance. Maintainability reduces downtime and extends mold service life.

Lesson 2 • Venting Design and Placement

Sizes and positions vents to evacuate trapped air and prevent burn marks. Vent depth must allow gas escape without causing flash.

Lesson 3 • Dimensional Tolerancing for Mold Components

Applies geometric dimensioning and tolerancing to mold plates, inserts, and moving components. Correct tolerancing ensures interchangeability and repeatable part dimensions.

Lesson 4 • Surface Finish Specifications

Translates part appearance requirements into cavity surface finish grades and machining sequences. Surface finish affects release force, gloss, and texture fidelity.

Lesson 1 • Defect Diagnosis and Correction

Maps common molding defects to their root causes in mold design or process settings. Systematic diagnosis guides targeted mold modifications rather than trial-and-error adjustments.

Lesson 2 • Pre-Trial Mold Inspection

Establishes a structured checklist for verifying mold assembly, cooling connections, and ejector function before the first shot. Pre-trial inspection prevents costly press-side failures.

Lesson 3 • Dimensional and Cosmetic Validation

Measures molded parts against drawing tolerances using CMM and visual inspection protocols. Validation data confirms whether mold corrections or process adjustments are needed.

Lesson 4 • Scientific Molding Trial Protocol

Applies a structured four-stage trial sequence to separate machine, material, and mold variables. Scientific molding isolates root causes and produces a robust process window.