Heat exchanger and corresponding production method

A method to produce a heat exchanger (10, 10′), comprising at least two plates (11, 12) of metal material having a pre-defined shearing perimeter, overlapping and joined together so as to define a perimeter edge (13) beyond the shearing perimeter and at least one circuit (14) for the passage of a heat-carrier fluid defined by at least one or more heat exchange channels (15) made between said plates (11, 12), wherein said method comprises:

• at least one deposition step, to deposit on at least one of two plates (11, 12) a detaching material according to the shape and the path of the heat exchange circuit (14) to be obtained;
• the overlapping and hot rolling of said plates (11, 12) with in the middle the template of the circuit (14) made of detaching material;
• the introduction of a fluid under pressure from at least one aperture made on a perimeter edge (13) made by overlapping the plates (11, 12) and consequent deformation of at least one of the plates (11, 12) in correspondence with said detaching material, thus obtaining, by inflation, one or more channels (15) and at least one heat exchange portion (19, 19′) extending beyond the shearing perimeter and situated in proximity to the perimeter edge (13) of the heat exchanger, that is, at a minimum distance (D1) from said perimeter edge (13),
• cutting the plates (11, 12) along the shearing perimeter, resulting in an exposed aperture of the heat exchange portion (19, 19′), and
• closing the exposed aperture in a finishing step, thereby forming a closing edge (20, 20′) of the heat exchange portion (19, 19′).