logo e

Custom Heat Sink & Cold Plate Manufacturing:
Built to your drawings. Optimized for manufacturability. Manufactured for reliable performance.

Extrusion Process

Home / SERVICES / custom heatsinks / Extrusion Process

Aluminum extrusion stands as a cornerstone manufacturing technique, transforming aluminum billets into complex, custom cross-sectional profiles through controlled pressure and thermal processing. This efficient method has become indispensable across industries, valued for its design flexibility, cost-effectiveness, and ability to produce lightweight yet durable components .

extrusion process - BY Thermal

How Aluminum Extrusion Works

extrusion - BY Thermal

The process begins with billet preparation: cylindrical aluminum alloy blocks are preheated to 400–480°C (750–900°F) to enhance malleability without melting . The heated billet is placed in a hydraulic press container, where a ram applies intense pressure to force the metal through a precision tool steel die . As the aluminum flows through the die’s shaped opening, it takes on the desired profile—similar to squeezing toothpaste from a tube . Post-extrusion, the continuous profile is cooled via air or water quenching, stretched to straighten and align grain structure, cut to length, and often aged to boost mechanical properties . Direct extrusion, the most common method, is used for solid rods, tubes, and complex sections, while careful temperature control ensures consistent quality .

Talk to the experts!

Key Advantages of Extrusion Process

Design Flexibility: Custom dies enable intricate, consistent profiles tailored to specific applications, from simple rods to complex structural shapes .

Strength-to-Weight Ratio: Extruded aluminum offers exceptional strength while remaining lightweight, outperforming many materials in structural efficiency .

Cost-Effectiveness: Tooling costs are manageable, and fast production turnarounds reduce lead times for both standard and custom orders .

Natural Benefits: Aluminum’s inherent corrosion resistance (from a protective oxide layer) and excellent thermal conductivity add functional value .

Industry Applications

Consumer electronics (e.g., gaming laptops, high-power smartphones, and mini PCs) face tightening space constraints and rising heat generation from high-performance chips, making extruded aluminum heat sinks a go-to solution. Using ultra-thin-walled extrusion technology with alloys like 6061-T6, manufacturers create compact, slim heat sinks that fit into 5-10mm thick device casings—while their multi-finned structure expands heat dissipation area by 2-3x compared to flat metal plates. For gaming laptops, extruded aluminum vapor chamber combinations reduce CPU/GPU temperatures by 12-18℃ during heavy load, preventing thermal throttling and maintaining frame rates. In smartphones, micro-extruded aluminum heat dissipation strips integrate seamlessly with internal components, leveraging aluminum’s high thermal conductivity to spread heat quickly across the device body. Moreover, extruded aluminum’s aesthetic versatility (via anodization in matte black, silver, or custom colors) aligns with consumer electronics’ design needs, making it a staple in premium devices.
Consumer Electronics Industry
LED lamp efficiency and lifespan depend heavily on heat control, and aluminum extrusion is the preferred solution for its customizability. Extruded heat dissipation profiles (using alloys like 6063-T5) can have complex fin designs tailored to lamp structures. With anodized surfaces, they balance aesthetics and heat dissipation, quickly transferring heat from LED chips to avoid light decay. Compared to stamping or casting, extruded LED heat sinks have no pores (higher thermal conductivity), controllable mold costs, and support small-batch customization. They are widely used in indoor lighting, outdoor street lamps, and landscape lights—their lightweight design eases installation, and weather resistance ensures long-term stable outdoor operation.
LED Lighting Heat Dissipation
Industrial robots and precision electronic control units operate at high frequency in enclosed spaces, demanding compact, efficient heat dissipation—exactly what extruded aluminum heat sinks deliver. Optimized extrusion mold designs produce thin-walled finned heat sinks, maximizing heat dissipation area in limited space while reducing equipment weight. For example, an automation enterprise switched from cast to extruded aluminum heat sinks; using alloy 6063 improved formability, thinning fin walls. This boosted heat dissipation efficiency, cut material costs and processing steps, and enhanced equipment stability. Additionally, extruded profiles’ electromagnetic shielding protects control systems from interference, and their corrosion resistance adapts to humid, dusty factory environments—making them ideal for PLC controllers, servo drives, and industrial sensors.
Industrial Automation Equipment
Aluminum extrusion is critical for NEV heat dissipation, especially in battery liquid-cooled plates and motor/electronic control systems. Extruded aluminum liquid-cooled plates (using alloys like 3003) offer high thermal conductivity (237W/m·K), lightweight (1/3 the density of steel), and corrosion resistance, stabilizing battery temperatures within the optimal 15-35℃ range. Models like Tesla Model 3/Y adopt integrated extruded liquid-cooled plates; their precision internal flow channels ensure uniform coolant distribution, boosting heat dissipation efficiency significantly while reducing vehicle weight and increasing range by 5%-10%. Additionally, extruded motor housings with spiral heat dissipation channels lower motor temperatures by 15%-20%, enhancing powertrain lifespan and efficiency.
New Energy Vehicle (NEV) Thermal Management Systems
BY Thermal

Free Thermal Analysis

If you need to know more about how to apply thermal analysis to specific products (such as skived heat sinks, electronic stamping heat sinks), or want to obtain a customized thermal analysis guide for your industry, you can leave a message on our website, and our professional team will provide you with one-on-one support.

Need more help?
Facebook Youtube Pinterest Instagram

Copyright © 2025 BY Thermal | All Rights Reserved.

Terms and Coditions

Privacy Policy

sitemap

Scroll to Top