Professional High Power Cooling Solution Service Provider And Heat Sink Manufacturer

Cold forging is to recrystallization temperature of profile below (generally refers to room temperature) forming processing, forging technology. Cold forging material is mostly below room temperature deformation resistance is lesser, plasticity better aluminum and partial alloy, copper and partial alloy, cold forging can make profile produces work hardening in processing process (strain hardening), can make intensity and hardness increase.Cold forged heat sink is a good choice for casting complex shapes with excellent thermal conductivity. The cold forging process allows an almost perfect straightness of more fins per square millimeter. The shapes of cold forged heat sink include plate fin heat sink, round pin heatsink and oval fin heat sinks.The manufacture of forged heat sinks are well suited to the use of copper because the copper heatsinkcan be shaped without high temperatures and can be formed with minimal damage. Cold forging heatsink manufacturing can often include secondary processing operations such as holes, chamfering and steps to reduce unnecessary waste.Cold forging technology has been widely used by heat sink manufacturers in the production of light source heat sinks and LED heat sinks. LORI is one of the few companies who used cold forging to produce heat sinks in early days and we have accumulated abundant experience of cold forging technology. In addition to the production of heat sinks for typical light sources, LORI has gained experiences in the manufacturing techniques for high power cold forged heat sink. We have resolved the problems such as the low thermal conductivity of die-casting micro-channels and higher costs for machining micro-channels. We have already applied cold forging heatsink  to cooling solutions including high-voltage inverters, wind power converters, and electric motor controllers.

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Forging Heat sink

Forged heat sinks are made by modifying this process (called cold forged). Cold forged is a manufacturing process in which aluminum or copper heatsinks are formed by the use of local compression forces.  Cold forging uses high pressure and low temperature to ensure that there are no bubbles, pores or other impurities in the material. This improves the thermal performance of the heat sinks and increases the density of the materials,  thus produces high quality products. LORI uses special die opening tools and great pressure to produce high precision heat sinks with high aspect ratios. Forged heat sink is usually manufactured one part at a time and material can be made from AL 6063 or C1100. A maximum aspect ratio of 35:1 is feasible and no draft angle is required on the fin. Cold forging fins can be round, elliptical, straight or any combination on the same part. Aspect ratio up to 35:1 are feasible, and no draft angles required on fins. 

When working with a high aspect ratio or a dense heat sink, the forged heat sink has no thermal interface between the heat sink and the base, resulting in better heat dissipation performance than the pressed heat sink or bonded heat sink.The heat distribution of the aluminum heat sink can be further improved by embedding the copper plug into the base during the forging process.Because this process is quite expensive, it may be worth exploring ways to produce square pins using cross-cutting for small quantities.For larger quantities, die casting is a good choice.

Another benefit of this process is that a forged heatsink of the same design can be used to produce heat sink of different heights using only one set of forging die. When working with a high aspect ratio or a dense heat sink, there is no thermal interface between the fins/pins and base of the forged heat sink, and the base will have better performance than the stamping fin or bonded fin heat sink .The heat distribution of the heat sink can be further improved by embedding a copper in the bottom of the aluminum heat sink during the forging process. Since this process is quite expensive for small volumes, it may be worth exploring the extrusion and crosscutting fin production, For larger volumes, cold forging is a good choice.


This process is an integrated structure and in most cases we use a "cold forged" process. We insert the aluminum alloy material into the forging die through high pressure.

Through cold forging process, we can produce accurate size, solid surface, reliable structure of the heat sink. And can make the heat sink fin higher, thus expanding the cooling area. One of the classic applications is in the field of leds.

● high aspect ratio or a dense heat sink fins maximize surface area

● cold forging materials can come in many sizes

● one operation can form a round pin, hole and standoffs on the forging die

● round shape heat sink (very suitable for LED cooling)

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