Die design (模具設計) is influenced by a comprehensive set of technical, economic, and operational factors12. Based on the source manuals, these factors are categorized into six key domains:
1. Production Volume and Economic Requirements
- Production Scale: The total required production quantity and monthly volume dictate the die classification—such as simple single-station dies for low volumes, compound dies for medium volumes, or multi-station progressive/transfer dies for mass production1more_horiz.
- Die Materials & Grade: High production volumes justify higher-grade alloy steels (e.g., SKD11) or tungsten carbide inserts, whereas low volumes utilize simpler structural steel or cast iron shoes35.
- Costs and Lead Time: Target unit cost, total tooling budget, and delivery deadlines dictate whether standard off-the-shelf die components are prioritized to shorten lead times1more_horiz.
2. Stamped Part Geometry and Material Properties
- Material Characteristics: Sheet thickness ($t$), tensile strength ($\sigma_b$), shear strength ($\tau$), yield strength, elongation, and grain direction dictate required press force, minimum bend radii, and springback allowance5more_horiz.
- Dimensional Accuracy & Surface Quality: Required tolerance grades (IT levels), allowed burr heights, and sheared edge smoothness determine the process type (e.g., standard blanking vs. fine blanking) and edge machining tolerances4more_horiz.
- Part Complexity & Formability: Intricate profiles, deep-drawing ratios, hole-to-edge spacing, and minimum die wall thickness limits dictate whether operations must be split across multiple stations12more_horiz.
3. Press Machine Specifications
- Tonnage Capacity & Working Energy: The die’s total calculated stamping force (cutting, stripping, and forming forces combined) must remain safely below the press’s rated tonnage capacity16more_horiz.
- Dimensional Envelope: The die’s closed shut height, outer length/width, and bed opening must match the press bolster dimensions, slide shut height adjustment range, and scrap drop-hole layout18more_horiz.
- Stroke & Speed: Press stroke length, SPM (strokes per minute), and press mechanism type (mechanical, hydraulic, or servo) affect strip advance speed, dynamic vibration, and drawing behavior19more_horiz.
4. Process Engineering and Structural Layout
- Strip Layout & Feed Pitch: Optimizing nesting configurations and strip width maximizes material utilization while maintaining bridge strength to advance the strip smoothly16more_horiz.
- Cutting Clearance: Selecting the proper punch-to-die clearance ($Z$) based on material thickness and hardness directly governs sheared edge quality, punching force, and tool wear10more_horiz.
- Center of Pressure Alignment: Aligning the combined geometric centroid of all stamping forces with the press slide centerline prevents off-center loading, slide tilting, and uneven die wear1628.
- Guiding & Positioning: The choice of guide posts, guide bushings, pilot pins, and stock wipers ensures precise, repeatable alignment across rapid stroke cycles29more_horiz.
5. Stripping, Ejection, and Material Handling
- Stripping Mechanics: Calculated stripping forces ($F_{\text{strip}}$) and ejector forces ($F_{\text{push}}$) govern the selection of springs, pressure pads, and gas/pneumatic cushions17more_horiz.
- Scrap & Part Discharge: Designing unobstructed scrap fall-through holes and reliable part ejection (e.g., air blow, scrap cutters, or transfer grippers) prevents slug jamming and tool damage1more_horiz.
6. Safety, Maintenance, and Tooling Life
- Maintainability & Re-sharpening: Utilizing insert blocks, split die sections, and grinding shims simplifies re-sharpening and localized component replacement29more_horiz.
- Safety & Foolproofing: Incorporating mis-feed detection sensors, safety stop blocks, and poka-yoke locators prevents mis-hits and protects operators during setup16more_horiz.
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