Cold Forged Heat Sinks: Maximum Surface Area, Zero Interface Resistance
Engineered for high-power density applications, Jindu’s advanced cold forging technology delivers superior thermal conductivity and structural integrity where traditional extrusion reaches its limits. By forming the base and fins from a single piece of aluminum, we eliminate the thermal interface resistance common in bonded solutions.
- Continuous Metal Fiber Structure for 100% thermal path efficiency.
- ±0.05mm Precision Tolerances for high-end electronic fitment.
- 85-95% Material Utilization reducing total cost of ownership.
What is Cold Forging? Solving the "Extrusion Limit"
A Cold Forged Heat Sink is a high-performance thermal component shaped under extreme pressure at room temperature. Unlike traditional extrusion, which is often limited by a low fin-to-gap aspect ratio, Jindu’s cold forging process enables the creation of dense, high-aspect-ratio fins (up to 3x the base diameter) in a single, solid piece.
The Jindu Manufacturing Process
Material Engineering & Simulation
Core Forging & Strengthening
T6 Solution & Artificial Aging: Heat treatment is performed in precision-controlled furnaces at 530±5°C, followed by aging to reach a target hardness of 90-100 HB. This prevents dimensional warping during long-term field operation.
Precision Finishing & Quality Assurance
Functional Surface Engineering: We offer 15±2μm Anodizing, Electroless Nickel, or Teflon coatings. All finishes are verified by 96-hour neutral salt spray tests (Rating ≥9) to meet industrial-grade anti-corrosion requirements.
100% Critical Dimension Inspection: Utilizing Hexagon CMM (Coordinate Measuring Machines) to verify fin height, base thickness, and hole positions.
Technical Specifications Matrix
| Category | Specification | Control Method |
| Materials | AA6061, AA6063 (T6) | Material Certification |
| Fin Surface | Ra ≤ 1.6um | Precision Profilometer |
| Flatness | ≤ 0.05mm/ 100mm | Marble Platform |
| Hardness | 90-100 HB (for 6061-T6) | Brinell/Webster Tester |
| Salt Spray | ≤ 96 Hours (Grade 9) | Salt Spray Chamber |
Industry Applications: Targeted Thermal Solutions
Jindu cold forged heat sinks are engineered to solve specific industry pain points where performance is non-negotiable.
New Energy Vehicles (EV/HEV)
●The Jindu Edge: The cold forging process provides exceptional mechanical strength. In high-vibration automotive environments (compliant with 3-axis random vibration testing), the monolithic fins carry zero risk of loosening or snapping, ensuring a service life of 15+ years.
5G Telecommunications & RF Modules
●The Jindu Edge: 5G hardware suffers from high heat density in restricted spaces. Jindu can manufacture asymmetric pin-fin patterns that optimize airflow and reduce pressure drop, improving cooling power by over 30% in forced-convection environments.
Power Electronics & IGBT Modules
●The Jindu Edge: These applications require extreme baseplate flatness (≤0.05mm) to match large IGBT modules. Jindu’s integrated forging-CNC process provides a solid base up to 20mm thick, acting as a highly efficient thermal buffer.
High-Power LED Industrial Lighting
● The Jindu Edge: By achieving high aspect ratios through cold forging, we maximize convection surface area without increasing weight. This reduces LED junction temperatures by 10-15°C, significantly slowing lumen depreciation and reducing maintenance costs.
FAQ Section
down to "Grain Flow" and "Geometric Flexibility." Extrusion grain structures are stretched longitudinally, and die limits prevent dense fin spacing. Cold forging compresses the metal in three dimensions, resulting in a denser grain. Most importantly, cold forging allows for Pin Fins, which break the linear airflow of extrusions and significantly enhance air turbulence for better cooling.
A: We set strict CTQs (Critical to Quality points). We monitor forging pressure fluctuations (≤±5%) via sensors and use multi-point thermocouples to ensure a uniform temperature field (±5°C) during T6 treatment. This ensures the 100,000th part has the exact same metallurgical structure as the 1st.
Cold forging is ideal for round, square, or polygonal symmetric shapes. For highly asymmetrical or complex structures, Jindu offers a leading "Cold Forging + Precision CNC" hybrid solution, retaining the thermal core of the forging while meeting complex assembly requirements.
Post-forging aluminum is in an unstable state. T6 treatment (solution + aging) eliminates residual internal stresses and increases tensile strength to over 290MPa. This is essential for parts requiring precision tapping or those operating in high-temperature environments to ensure dimensional stability.
We understand project urgency. Jindu has an in-house tool center. For new cold forged projects, die design and fabrication take 15-20 working days, with initial samples produced within 25-30 working days. Once the die is finalized, mass production reaches speeds of 20-60 pieces per minute.