模具设计流程: 从 3D 概念到生产工具 2026
7 步模具设计. 成本, 交付时间, 材料, 定制箱 OEM 常见陷阱.
定制防护箱 OEM 始于模具设计。本 7 步流程指南涵盖 3D 设计、模具材料选择、机加工、测试和验证 — 附 B2B 买家成本和交付时间基准。
7-Step Mold Design Process
- Step 1: 3D Design (3-5 days) — Customer provides specification or 3D model (STEP, IGES, SolidWorks). Our engineering team creates optimized design with draft angles, wall thickness, ribs, and bosses. Free service for orders 1,000+ units.
- Step 2: Mold Flow Analysis (2-3 days) — Moldflow simulation predicts filling, cooling, warping. Identifies potential defects before machining. Saves 2-4 weeks of trial-and-error.
- Step 3: Mold Material Selection (1-2 days) — Choose mold steel based on production volume:
- PP+ABS: P20 (pre-hardened steel), 1,000-50,000 cycles
- PP+GF: H13 (hardened steel), 50,000-500,000 cycles
- Aluminum: 7075-T6 (for prototypes), 1,000-10,000 cycles
- Step 4: Mold Machining (15-25 days) — CNC milling, EDM (electrical discharge machining), grinding. Precision: ±0.02mm. Includes cooling channels, ejector pins, parting line.
- Step 5: Mold Polishing & Assembly (3-5 days) — Mirror polish for high-gloss finish, texture for matte. Assembly: cores, cavities, slides, lifters.
- Step 6: First Article Testing (5-10 days) — T0 (initial sample) injection, dimensional check, material testing. Iterate 2-3 times to T1/T2/T3 (final samples).
- Step 7: Mass Production (30-45 days) — Full production run with IQC/IPQC/OQC. First batch: 5-10% scrap rate acceptable, then < 0.5% for stabilized process.
Total lead time: 60-90 days from spec to first production batch.
Mold Cost Benchmarks (2026)
| Case Size | Complexity | Material | Mold Cost (USD) | Cycle Life | Lead Time |
|---|---|---|---|---|---|
| Small (5-15L) | Simple (1 cavity) | Aluminum | $3,000-5,000 | 10K cycles | 30-45 days |
| Small (5-15L) | Moderate (1 cavity + slider) | P20 steel | $5,000-10,000 | 50K cycles | 40-55 days |
| Medium (15-50L) | Moderate (1 cavity + inserts) | P20 steel | $8,000-20,000 | 100K cycles | 50-65 days |
| Medium (15-50L) | Complex (multi-cavity) | H13 steel | $25,000-50,000 | 500K cycles | 60-80 days |
| Large (50-100L) | Complex (multi-cavity + slider) | H13 steel | $40,000-80,000 | 500K cycles | 70-90 days |
| Custom (100L+) | Very complex (multi-action) | H13 + beryllium copper | $80,000-150,000 | 1M cycles | 90-120 days |
Amortization Strategies
Mold cost is a one-time investment amortized over production volume. Three common strategies:
- Volume-based amortization — Buyer pays $50K mold, amortized over 100K units = $0.50/unit. Standard B2B practice.
- Free mold with volume commitment — Factory absorbs mold cost in exchange for multi-year purchase commitment (typically 5K+ units/year for 3-5 years). Win-win for stable volume.
- Shared mold — For standard sizes (e.g., 20L camera case), factory offers existing mold with $500-2000 customization fee for unique features (color, branding). Fastest lead time (15-25 days).
Common Mold Design Pitfalls
Pitfall 1: Inadequate draft angles (less than 1°). Causes part sticking, warping, and shortened mold life. Standard: 1-2° for PP, 2-3° for ABS+PC.
Pitfall 2: Uniform wall thickness. Causes sink marks, warping, voids. Vary thickness 25-40% (e.g., 2.5mm wall + 3.5mm rib base).
Pitfall 3: Poor gate location. Causes weld lines, flow hesitation. Gate should be at thickest section, oriented with material flow direction.
Pitfall 4: Inadequate cooling channels. Causes cycle time increase (15-30% longer) and warping. Use conformal cooling for complex parts.
Pitfall 5: No design for assembly (DFA). Snap fits, threaded inserts, hinges should be designed into the part, not assembled later. Reduces assembly time and cost.
Design Validation Checklist
Before approving mold production, validate:
- ✓ Wall thickness 2-4mm (uniform ±10%)
- ✓ Draft angles 1-3°
- ✓ Radii ≥ 0.5mm (avoid sharp corners)
- ✓ Rib thickness ≤ 0.6× wall thickness
- ✓ Boss diameter ≥ 2× hole diameter
- ✓ Parting line location (visible vs hidden)
- ✓ Gate location (thickest section, no flow hesitation)
- ✓ Cooling channel placement (uniform, near hot spots)
- ✓ Ejector pin location (no cosmetic surface marks)
- ✓ Material shrinkage compensation (1-2.5% for PP+GF)
KeXinMaterials Mold Capabilities
- 3 in-house mold design stations (SolidWorks + AutoCAD + Moldflow)
- Sample lead time: 7-10 days for standard, 14-30 days for custom
- Mold cost range: $3,000-150,000 depending on complexity
- Production lead time: 30-45 days from T1 approval
- Free mold for orders 5,000+ units (with 3-year volume commitment)
- 20+ patents on case design and mold cooling
Next Steps
For custom case OEM, email kexin@beeaa.com or WhatsApp +86 13590555309 with: case dimensions, application, quantity, target cost. We provide free 3D design and mold flow analysis for orders 1,000+ units.
Email: kexin@beeaa.com | WhatsApp: +86 13590555309