Metal tube plate for heat exchanger - has transition radii joining sharp edged pierced hole in tube collars

摘要

The tube plate of metal is used in the motor vehicle heating system heat exchangers or for engine radiators. The tube plate has projecting collars on one side for holding tubes. The extent of metal forming is kept low. The transition radius on the side of plate opposite to that with the raised collar, joining the pierced hole is smaller than or equal to the transition radius of the plate joining the raised collar. The hole has two cold formed internal ribs.