Clear Anodized Extruded Aluminum Heat Sink

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Extrusion technology is the most common and cost-saving process in thermal industry, usually the material is aluminum alloy which includes AL 6061 and AL  6063 which have excellent malleability and thermal conductivity. The aluminum heat sink extrusions often need to be anodized, and the color can be customized, but the most common types are black anodized and clear anodized, the color is based on the customer's requirements.

Anodization is very important for a aluminum extruded heat sink, compared with painting or power coating, there is no element attached in the heat sink surface, actually the anodization process is to create an oxide layer on the aluminum surface to protect the heat sink from corrison and electric conduction.

There are a lot of benefits on anodization:

1, Protect the heat sink from corrison;

2, Protect the heat sink from wear;

3, Protect the heat sink from electric conduction;

4, Improve the heat sink surface emissivity.

What should be careful about before processing aluminum extruded heat sink?

  Aluminum extruded heat sink is processed by aluminum profile, so in the process from aluminum profile to finished heat sink, what problems should be paid attention to, we will introduce them to you one by one, let's talk about the first process of aluminum profile heat sink process - precautions for cutting.

  The cutting of the aluminum profile is the first process of forming the aluminum extruded heat sink. The semi-finished product is the prototype of the aluminum profile heat sink. When cutting, special attention should be paid to the following issues: (1) Special care should be taken when moving the aluminum profile to the cutting table. , Do not let the corners of the cutting table scratch or bruise the aluminum profile; (2) During cutting, the aluminum scraps on the cutting table need to be cleaned up, so as to avoid affecting the position of the aluminum profile during cutting and thus affecting the size of the aluminum profile heat sink extrusion ; (3) Carefully set the size of the cutting, and strictly follow the size of the drawing; (4) Check the blade before cutting; (5) Pay attention to the temperature change of the blade when cutting, whether it needs to add water, etc.; (6) After cutting the first one, , to check the size.

  The cut aluminum heat sink semi-finished products will be flowed to the CNC machining center for next processing. What should be concerned  on CNC machining? 

what should be concerned on CNC machining of aluminum heat sink?

  During the production of aluminum profile heat sink extrusion, after the aluminum profiles are cut into semi-finished products, they will be processed by CNC. CNC processing is a relatively refined operation. There are many problems in the operation process that should be paid attention to. otherwise it will result in a higher failure rate of aluminum heat sink.

  For example, when processing an aluminum radiator on a horizontal machining center, multi-station processing is generally required, so it is necessary to consider the optimal position of the parts (including fixtures) on the machine table. In the process of technical preparation, it is necessary to take into account the formation of the machine tool, and to optimize and match the tool length of each part. If the consideration is not thoughtful, it will directly cause the machine tool to overtravel and replace the tool, so as to meet the machining accuracy or re-enter the test. In the cutting stage, it will waste more time and increase the defective rate, so this problem must be considered before processing the aluminum heat sink.

   If the CNC machining machine has the function of automatic tool change, it is determined that its biggest weakness is the cantilever machining of the tool, and the boring die and bracket cannot be used during the machining process. When processing multi-station parts, we need to accurately calculate the distance from each processing surface of each station to the end face of the machine tool spindle and select the best tool length. After setting,it's necessary to inspect  the first aluminum heat sink:

  In addition, the CNC machining of aluminum heat sink should be concerned on the following issues:

(1) If the aluminum profile heat sink is too high, especially when processing some high-power heat sinks, it should be roughened with knives of different lengths in layers. After roughing with a large knife, the remaining material should be removed with a small knife .

(2) Use flat-bottomed knives to process the surface, and rarely use ball knives to reduce processing time; if there is a slope, and it is an integer, use a sloped tool for processing.

(3) Reasonablely setting of tolerances, so that the machining accuracy and computer calculation time are balanced with each other, and more processes are performed to reduce the time for empty tools.

(4) If the material hardness of the aluminum heat sink is high, choose up milling; if the material hardness of the aluminum heat sink is low, choose down milling. In addition, roughing up milling and finishing down milling.

(5) The tool material has good toughness and low hardness and is suitable for rough machining, while the tool material has poor toughness and high hardness and is suitable for finishing.

(6) In the process of processing, be careful not to touch the aluminum profile heat sink fins, so as not to damage the fins, especially if some heat sinks have been processed with anodizing.

Sinda Thermal is very experienced and professional to supply clear anodized extruded aluminum heat sink, our factory owns the cutting machines, CNC machining machines, and varieties of mearsurement equipment, we can complete most of the process in house, so we can perfectly control the quality and the cost, Sinda Thermal can provide high quality and most cost effective products than trading companies. Sinda Thermal has been devoted to heat sink design and manufacturing over 7 years, we own plenty of technologies and patents. Please don't hesitate to contact us if you have any thermal issues or heat sink building requirements, we are always provide our best service and thermal solutions.

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