Pressing group for a sintering press for sintering electronic components on a substrate

A sintering press comprising

• a pressing group comprising a multi-stem cylinder having a front head and a rear head together delimiting a compression chamber, wherein:
• between the front head and the rear head is interposed an annular sealing element positioned around the compression chamber,
• in the rear head an inlet passage is formed for introducing a pressurized fluid into the compression chamber in the rear head;
• in the front head pressing stems are slidingly supported, parallel and independent from each other, rear ends of said pressing stems protruding into the compression chamber,
• in the compression chamber, an actuating flat gasket extends over the rear ends of the pressing stems in such a way that, when the compression chamber is pressurized, the actuating flat gasket acts on said rear ends to transfer pressure in the compression chamber to each individual pressing stem,
• the actuating flat gasket is fixed to the front head by an anchoring frame which engages a peripheral portion of the actuating flat gasket,
• the anchoring frame is completely housed in the compression chamber so that the pressurized fluid also acts on said anchoring frame,
• wherein the compression chamber forms a bottom wall opposite the actuating flat gasket, wherein the anchoring frame has a rear surface facing and separated from said bottom wall, wherein the compression chamber is radially delimited by a side wall, and wherein the anchoring frame has a side surface facing and separated from said side wall, and
• a support unit facing the pressing group and suitable for supporting at least one substrate, at least one of said pressing group and support unit being axially translatable with respect to the other between a retracted resting position and an advanced pressing position, in which electronic components are engageable by the pressing stems, or by heating the pressing group.