The difficulties of small quantity and multi-species are: high mold amortization, high switching cost, and difficult quality consistency. This paper introduces the idea of mold modularity and quick mold changeover to help balance between cost, lead time and quality.
1. Cost structure disaggregation: where the money is spent
- Mold machining and trial molding: one-time cost
- Mold Changes and Machine Setups: The Hidden Costs of Every Changeover
- Scrap and rework: from unstable windows and unclear standards
2. Die modularization: limiting "change" to the local level
- Universal base + interchangeable inserts: suitable for serialized products
- Universal gate/runner system: Reduces uncertainty with each mold trial
- Standardized positioning and cooling interfaces: Reduced set-up time
3. Quick mold change (SMED) in silicone parts landing points
- Standardized mold interfaces: positioning, piping, and wiring for quick connections
- Parameter templating: curing time, temperature profiles, injection/holding pressure profiles
- First Article Confirmation Sheet: Solidifying Experience into Inspection Items
4. Consistency of quality: small quantities require more standards
- Appearance standardized samples: reducing subjective judgments
- Critical dimensions and inspection methods: written into drawings and inspection specifications
- Change management: re-validation rules for changes in inserts, material lots, process parameters
5. Applicable and inapplicable scenarios
- Application: serialized seals, keyed parts, thermal conductive gaskets, etc.
- Not applicable: platforms with very different structures and no commonalities
FAQ
- Does modularity sacrifice accuracy?
Proper design does not. The key is in the positioning datum and machining accuracy control, as well as the first piece confirmation and process monitoring after assembly.
- Does a quick mold change always reduce costs?
Effective in small-volume scenarios where switching is frequent; gains may be limited if large-volume singles are used for long periods of time.