METHOD AND DEVICE FOR ROLLER PRESSING OF SINTERED METALLIC MATERIAL

PURPOSE:To suppress the protrusion of a sintered metallic member to the outside of a die to a negligible level by retreating the parts for forming the side faces of the die in the pressurizing direction by a roller device with a reduction in the size of the sintered metallic material by pressurization. CONSTITUTION:Parts 31, 32 for forming the bottom surface and side surfaces of a die and the space partitioned by a roller 42 are so set as to attain the finishing size of a sintered metallic member when a roller device 4 is lowered down to the position limited by a stopper 34 in the stage of working said member by a roller pressurizing device 1. The device 4 is once risen and the member 2 is contained into a die 3. The parts 32 are risen by means of springs 35 to the height above the top surface 21 of the member 2. When the roller 42 is slid while the top surfaces of the parts 32 and the member 2 are pressed by the descending roller, the member 2 is compacted at the surface 21 and is reduced in a vertical direction. Since the parts 32 are supported by the springs 35, said parts are retreated by the roller 42 and therefore the member 2 is deformed while the side faces are supported by the parts 32 and the protrusion to the outside of the die is limited.