Development Of The Pin-fin Heat-sink With Textile Structure

Currently, cooling problems of electronic products have become the bottleneck whichrestricting the development of electronic products. In various radiator, the pin-fin heat-sink has thebest heat dissipation performance because it’s larger surface area, smaller size and mass, all thismake the area of contact with the air is large. But now there are still many defects inmanufacturing this pin-fin heat-sink, such as difficult to produce, high costs, low yields, thepin-fin can’t be made too tall and thin, all these are seriously affected the widespread use of thepin-fin heat-sink.When the fineness of needle ribs is too slender, the lack of rigidity of the ribs make it hard tomanufacture pin-fin heat-sink by conventional manufacturing methods, but the wires have goodductility, slender wire has the similar processing characteristics with the textile yarn, it’s soft, andhas a certain toughness and difficult to break, it’s suitable for textile processing requirements.Therefore, in order to overcome the difficulties in manufacturing pin-fin heat-sink, this paperexplored the textile weaving methods, eventually proposed a feasible method to woven the pin-finheat-sink. Use the heddle which is used in making leno to make pin-fin heat-sink, the pin-fin loopwas constrained by weft wire and a tool used to form the loop.Since there is no suitable machinery for making such pin-fin heat-sink, in this paper,wechanged some parts of the existing rapier in our school, making it suitable for weaving suchpin-fin heat-sink. The major transformation on the rapier includes: designed looped pieces withthree different heights and mounted them on the rapier, making the rapier is suitable for weavingpin-fin heat-sink; other transformations on the loom include: Increasing cloth fell, installed latchswhich control the movement of the frame, use a specific shuttle to control weft insertion, adjustthe position of the beam to increase the beating force, using a hanging hammer to control thetension of looped warp, all these transformations make the rapier can be used to weave the pin-finheat-sink with textile structures.This paper also designed a weaving parameters of the pin-fin heat-sink, Choose theappropriate raw materials for weaving and eventually produced the eligible pin-fin heat-sink witha textile structure. Then appearance evaluation and size parameters analysis, the results show that:the heat-sinks with copper wire have the same parameters with set ones, while the heat-sink withstainless steel wire doesn’t catch the setting weft density and the height of pin-fin is slightly higher than the height of the piece used to loop.After that, this paper tested the cooling performance of this weaved pin-fin heat-sink,designed a set of simple and convenient thermal performance evaluation methods, set up a testdevice. And the test data obtained were analyzed and summarized. Test results show that: First,this paper presents the thermal performance test method is feasible. Secondly, when the wind has aspeed of2.5m/s, the height had no significant effect on the thermal performance of this type ofheat-sink, which is due to the base structure of the heat-sink isn’t a plate shape, so thetransmission speed of the heat is slow.Finally, this paper proposed a way to reconstruct an automatic loom based on thetransformation of rapier and manual weaving, proposed which institutions should be transformedand how to transform them, the institutions include: device prevent the heald frame to move, weftinsertion device, beating device, take-up device, coiling device. All this laid a solid foundation forachieve continuous production.