Round holes are preferred for sheet metal parts

Round holes are preferred for sheet metal parts, and the mold processing is easy. The selection of air holes includes round holes, hexagonal holes and square holes. The opening rate of round holes is low and the heat dissipation effect is poor. Hexagonal air hole has high opening rate and good heat dissipation effect. The square air hole has the highest opening rate. On the premise of meeting the heat dissipation requirements of the system, round holes are preferred.

Sheet metal blanking hole spacing and hole edge spacing

When the punching hole of sheet metal is not parallel to the hole or edge, the hole spacing or hole edge spacing shall be at least 1 time of the thickness of sheet metal, i.e. B ≥ t. When parallel, the hole spacing or hole edge spacing shall be at least 1.5 times the thickness of the sheet metal, i.e. C ≥ 1.5T.