Patent EP-3900024-A1 (EP)
Inventor: SCHIVALOCCHI NICOLA
IPC: B30B15/06
Filed: 2019-12-17
Abstract: A sintering press (1) for sintering electronic components (10) on a substrate (12), comprises a pressing unit comprising a plurality of presser rods (112) controllable to apply sintering pressure to the electronic components (10) to be sintered, a plurality of reaction elements (40) each forming a support plane for a respective substrate (12), an element plate (70) suitable to slidably support the reaction elements (40) and a heating circuit (72) comprising heating elements embedded in a heating body (76) placed around the element plate (70) to bring the element plate (70) to a sintering temperature. A heat diffusion plate (80) is placed in contact with the heating body (76) and extending onto the element plate (70) between the reaction elements (40), the heat diffusion plate (80) being made of a material (e.g., Cu) having a higher thermal conductivity than that of the element plate (70) (e.g., steel). T he heat diffusion plate (80) may comprise at least two end heat collectors (82), opposite each other and fixed, each straddling the heating body (76) and the element plate (70), and a central grid (84) that extends with contact on the element plate (70) surrounding the reaction elements (40). T he pressing unit may comprise a presser heating plate (110) slidably supporting the presser rods (112), the presser heating plate (110) comprising an inner plate (114) suitable to slidably support the presser rods (112) and a presser heating body (116) placed around the inner plate (114) and provided with heating means (118) suitable to heat the inner plate (114) and thus the presser rods (112), wherein the pressing unit may further comprise a second diffusion plate (120) placed in contact with the presser heating body (116) and extending on the inner plate (114), between the presser rods (112), the second diffusion plate (120) being made of a material (e.g., Cu) having a higher thermal conductivity than that of the inner plate (114) (e.g., steel). Compensation holes (88, 124) may be made in the heat diffusion plate (80) and/or the second diffusion plate (120) so as to guarantee uniform heating of all the reaction elements (40) and/or all the presser rods (112). The sintering press (1) may also comprise a plurality of load cells (50), each operatively connected to a reaction element (40), so that said load cell (50) detects, by means of the reaction element (40), the force exerted by one or more presser rods (112), the load cell (50) being housed in a cell holder plate (52) operatively connected to a cooling circuit (54). Each reaction element (40) may have a heating portion (40a) that passes through the element plate (70) and which is suitable to transmit by conduction the heat of the element plate (70) to the substrate (12), and a cooling portion (40b) shaped so as to dissipate the heat transmitted from the element plate (70) to the heating portion (40a). The cooling portion (40b) may comprise an axial succession of dissipating disks (44) that extend coaxially to the axis of the reaction element (40). The cooling portion (40b) may be equipped with an infrared screen (46) facing the load cell (50).