This document presents the entire SEAMAC propeller manufacturing workflow, highlighting our breakthroughs in casting technology, machining processes, and quality control. By integrating 12 proprietary technologies—including rapid-dry sand-mold casting and 5-axis simultaneous machining—our propellers exceed industry benchmarks by more than 20 % in accuracy, efficiency, and service life. The paper dissects all 23 critical operations from mold design to final delivery, revealing the technological backbone behind SEAMAC’s superior performance.
1. Process Overview
SEAMAC propellers are manufactured using a composite manufacturing process combining precision casting and CNC machining. The entire production process consists of six major stages and 23 key processes, all of which are carried out in accordance with the ISO 9001 quality management system. Compared with traditional processes, our manufacturing cycle has been shortened by 30%, product performance has been improved by 25%, and the scrap rate has been controlled to less than 0.5%.
2. Mold Design & Fabrication
2.1 3-D Modeling
Technical Highlights：
- Parametric design software
- Blade-section curves refined from 20+ years of data
- Automatic tool-path generation
2.2 Core Machining
3. Casting Workflow
3.1 Rapid-Dry Sand Mold Preparation (patented)
Breakthroughs：
- New binder formulation：
- Drying time: 72 h (traditional)→8 h (SEAMAC)
- 40% increase in strength
- Air permeability increased by 35%
- Molding system：
- Accuracy：±0.1mm
- Multi-cavity per pattern plate
3.2 Melting & Pouring
Process control：
- Medium-frequency induction furnace (max 20 t)
- Temperature control：±5℃
- Degassing: rotary argon lance
- Degassing: rotary argon lance
- Low-pressure pouring：
- Pouring rate：3-5kg/s
- Controlled temperature gradient
- Directional solidification
4. Heat Treatment
4.1 Solid solution treatment
Parameter control：
- Temperature：950±10℃
- Holding time： wall thickness (mm)×1.2minutes
4.2 Ageing Treatment
Innovation：
- Multi-stage ageing
- Temperature uniformity（±5℃）
- Furnace-atmosphere monitoring
5. Machining Workflow
5.1 Roughing Processing
Equipment configuration：
- Large vertical lathe
- Maximum machining diameter：5m
- Positioning accuracy：01mm
- Equipped with an automatic measurement system
6. Surface Finishing
6.1 Polishing
All blades are hand-finished by veteran craftsmen for mirror-like smoothness.
6.2 Anti-corrosion Coating
Patented technology：
- Multi-layer composite spray
- 80–120 µm thick
- NDT to ensure defect-free surfaces
- Friction coefficient reduced by 30%
7. Quality Inspection
7.1 Full-Process Control
Key checkpoints：
- 12 incoming material tests
- 8 in-process casting QC gates
- 23 final performance verifications
7.2 Advanced Test Equipment
8. Process Advantages
8.1 Compared Conventional Processes
Performance gains：
- Efficiency boost: +18-25%
- Service life: +30-40%
- Vibration noise: -15dB
- Weight accuracy: ±1%
8.2 Core Technological Breakthroughs
- Rapid-dry sand mold
- 72% reduction in manufacturing cycle time
- Reduce mold costs by 45%
- Improve dimensional accuracy by 2 levels
- Composite processing technology：
- 60% increase in processing efficiency
- Tool life extended by 3 times
- Energy consumption reduced by 35%
9. Application Cases
9.1 Container-ship Propeller
Project data：
- Diameter：5m
- Weight：12T
- Delivery time：45 days (industry average 60 days)
- Verified efficiency: 72.5 % (2.3 % above contract)
9.2 Luxury Cruise Propeller
Innovations：
- Low-noise design
- Asymmetric blade geometry
- Intelligent monitoring system
10. Conclusion
Through an innovative manufacturing system, SEAMAC propellers achieve：
- Precision: key tolerances to IT6 grade
- Efficiency: 15–20 % ahead of industry average
- Durability: design life≥10 years
- Service: delivery time 30 % shorter
Our core strengths：
- 12 proprietary patents
- 12 proprietary patents
- Continuous process innovation
- Custom-engineered solutions
By choosing SEAMAC, you receive：
- Proven superior performance
- Significant economic benefits
- Reliable quality assurance
- Comprehensive technical support
