SMED - Single Minute Exchange of Die

Single-Minute Exchange of Die (SMED) is a methodology reducing equipment changeover times from hours to minutes (under 10 minutes ideally) through systematic analysis and optimization. SMED distinguishes internal activities (requiring equipment stopped) from external activities (performable while running) and optimizes both. IoT systems guide changeover procedures and track performance.

SMED Methodology

Current State Analysis Video recording and IoT timing accurately measure changeover duration and activities. Detailed analysis reveals time allocation and improvement opportunities invisible during observations.

Internal/External Separation Classify activities as internal (must be performed while stopped) or external (can be done while running). Converting internal to external activities dramatically reduces stopped time.

Optimize Internal Activities Streamline remaining internal activities through better procedures, quick-change fixturing, standardized adjustments, and elimination of search/travel. IoT-guided procedures ensure consistency.

Continuous Improvement Regular measurement and review sustain improvements and identify additional optimization opportunities. IoT tracking reveals performance variations requiring attention.

Why It Matters

Capacity Generation Reducing changeover time increases available production time. Converting 60-minute changeovers to 15 minutes on equipment with six daily changeovers generates 4.5 hours additional capacity (19% increase).

Flexibility Quick changeovers enable economical small batch production and frequent product switches. This flexibility supports high-mix manufacturing and responsive customer service.

Inventory Reduction Short changeovers allow production in smaller batches reducing work-in-process inventory and finished goods stocks. Lower inventory improves cash flow and reduces obsolescence risk.

Related Terms

• Internal Activities - Changeover tasks requiring equipment stopped
• External Activities - Preparatory tasks performable while equipment runs
• Quick-Change Tooling - Fixtures enabling rapid setup
• One-Touch Setup - Ideal of single-motion changeover

Example

An injection molding facility producing automotive components performs six mold changes daily averaging 75 minutes each. This consumes 7.5 hours (31% of available time) reducing capacity and forcing large batch production.

SMED analysis using CleverIoT changeover tracking reveals: 25 minutes locating and transporting molds (external activity), 15 minutes physical mold swap (internal), 20 minutes heating new mold to temperature (partially external), and 15 minutes process parameter adjustments (internal).

Improvements implement: mold staging areas enabling pre-positioning during production, mold heaters preheating externally, quick-connect fittings for utilities, and IoT-guided parameter loading from validated recipes. Optimized changeover time averages 18 minutes (76% reduction).

Saved time generates 5.7 hours daily additional capacity worth $420,000 annual revenue. Reduced batch sizes cut inventory by 35% improving $180,000 cash flow. Combined benefits provide 6-month ROI on SMED implementation.