Extruded Heatsinks  Manufacturers, Traders, Suppliers

Fischer Elektronik, founded in 1968, is one of Europe’s leading manufacturers of electro-mechanical components such as heatsinks, enclosures, connectors and thermal interface materials.
At our headquarters in Lüdenscheid, North Rhine-Westphalia, which covers an area of 28,000 m², over 400 employees ensure manufacturing under optimal conditions.
The application of the most modern techniques and production processes as well as the continuous development of new products are of utmost importance to us.
Our standard product portfolio comprises over 75,000 items, which can be easily traced in our well-known catalogues.
Besides our vast standard portfolio, we are specialized in offering customer-specific solutions, either based on our standard items or completely new developments.
Our extraordinary production depth allows to put almost every customer demand into practice.
Highest quality and environmental awareness belong to our company’s philosophy and are practiced throughout the entire enterprise
Since 1994, Fischer Elektronik is certified according to ISO 9001 for its quality management system and has obtained its certificate according to ISO 14001 for its environmental management system shortly after in 1998. Since 2011, Fischer Elektronik is also certified according to DIN ISO/IEC 27001 for its information security management system..

1、Material and mold parameters
Aluminum material selection:
The commonly used AA6063 aluminum alloy has a thermal conductivity of 160-180 W/m · K. It is necessary to ensure that the surface of the ingot is smooth and free of segregation nodules, and the flatness error of the end face is ≤ 3mm.
The recommended length of the ingot is 0.6-0.85 times the normal length, and short casting rods (0.4-0.6 times) are preferred during mold testing.
Mold requirements:
Using H13 steel or imported high-quality steel, vacuum heating quenching+high-pressure pure nitrogen quenching, hardness HRC48-52.
The mold design needs to control the fin thickness to length ratio to be ≤ 1:18, and the rationality of the working zone needs to be verified through simulation for complex cross-sections.
2、 Extrusion process parameters
Temperature control:
The heating temperature for aluminum ingots is 480-520 ℃, and the heating temperature for molds is 480 ℃ (with a diameter of less than 200mm and insulation for ≥ 2 hours).
The temperature difference between the mold and the ingot should be ≤ 50 ℃ to avoid mold blockage caused by a decrease in metal temperature.
Pressure and speed:
Initial pressure ≤ 8MPa, low-speed trial mold (discharge for 3-5 minutes), normal production pressure ≤ 120kg/cm ².
The extrusion speed should be stable to avoid sudden acceleration causing tooth breakage or uneven discharge.
3、 Post processing and detection
Timeliness processing:
The aging temperature is 190 ± 5 ℃, and the insulation time is 2.5-4 hours. After being taken out of the furnace, it is air-cooled
Quality inspection:
Dimensional tolerance: ± 0.1mm (national standard requirement).
Surface defects: The oxide slag should be ≤ 0.1mm, and the micropore rate should be ≤ 3%
4、 Process optimization direction
Reduce extrusion pressure: Reduce the risk of tooth breakage by shortening the ingot length and optimizing the mold flow design
Improving heat dissipation efficiency: using serrated or buckle Fin technology to break through the limitation of fin aspect ratio (up to 1:60)