MicroForging is one of the world's most advanced cold forging technique, developed from new concepts by ALPHA Company Ltd. This technology permits the mass production of parts with a precision and ultra-fine detail previously considered impossible. When designing a heat sink to be produced by MicroForging, the following points need to be considered.
The cross sectional shape of the fin can be round, square, elliptical, hexagonal or virtually any other.
Fins can be manufactured with a height approximately 50 times their thickness or diameter. Technically more than 80 times is possible, but the rate of increased performance becomes less as height is increased. Taking performance and cost factors into account, we recommend a fin height 45 times the thickness or less.
Ideally, the fins will be arrayed uniformly on the base. However, fins can be deleted from parts of the base, or the density of distribution can change gradually.
The base can be not only square, but also rectangular, round or irregular.
The cross section reduction ratio is the proportion of the total area of the base to the finless area of the base:
(area of the base - total fin area) / ( area of the base )
expressed as a percentage. For example, a heat sink with 2mm square pins with a pitch of 4mm would have a reduction ratio of 75%.
In practice heat sinks, excluding those for natural heat dissipation, have a cross section reduction ratio of 75% to 85%. MicroForging allows production of heat sinks anywhere within this range.
Most of our heat sinks are made from aluminum A6063, but pure aluminum can also be used. Depending on the shape, the use of high strength aluminum (A2000 types) is also possible.
If strength is required solution heat treatment is possible.
© 2007 Alpha Novatech, Inc.