Abstract: A method for fracturing a metal component in which a through hole is included, and groove portions that continue from a first open end to a second open end of the through hole are formed at facing positions in an inner circumferential surface of the through hole, includes specifying positions on which a stress is to concentrate when fracturing of the metal component is started, in the groove portions of the metal component; forming stress concentration portions at positions in bottom portions of the groove portions corresponding to the specified positions such that the specified positions in the groove portions are caused to serve as breaking start points; and causing cracking earlier at the stress concentration portions in the groove portions than at each portion of the groove portions when the fracturing is started and causing cracking to develop from each portion of the groove portions.

Abstract: A method for processing fracture surfaces of a ductile metal component by processing fracture surfaces (51a and 52a) of fracture components (51 and 52) into which the ductile metal component (50) is divided by fracturing the ductile metal component (50) in a fracture direction includes: a holding step of holding the fracture components in a state in which the fracture surfaces of the fracture components are separated from each other; a vibration step of imparting predetermined vibration to at least either one of the fracture components being held in the holding step in a direction intersecting the fracture direction; a pressing step of pressing the fracture surfaces of the fracture components against each other by a specified pressing force in a state in which the vibration is imparted by the vibration step; and a separation step of separating the fracture surfaces of the fracture components from each other after the pressing step in the state in which the vibration is imparted by the vibration step.

Abstract: This is a method of forming a fracture start portion of a ductile metal part on an inner circumferential face of a through hole by irradiating laser to an opposing position of the inner circumferential face of the thorough hole of the ductile metal part having a predetermined through hole and by forming a large number of recess portions separated with a predetermined distance at a predetermined interval from one opening to the other opening of the through hole, in which a recess part is formed, instead of by focusing the laser exactly onto the inner circumferential face of the through hole, by irradiating it onto the inner circumferential face of the through hole while defocusing from the inner circumferential face of the through hole by a predetermined amount as well as by supplying an assist gas to a position of the laser irradiation, and the laser is moved linearly at a predetermined speed from one side opening to the other side opening on the inner circumferential face of the through hole while irradiatin

Abstract: A fracture surface treatment method of a fractured ductile metal part for treating fracture surfaces 51a and 52a of the ductile metal part 50, said fracture surfaces 51a and 52a being fracture surfaces obtained by a fracturing operation of fitting halved mandrel portions into a penetrative bore of the ductile metal part having the penetrative bore and driving a wedge in between the halved mandrel portions, said fracture surface treatment method holding said fractured ductile metal part 50 in a state where said fracture surfaces 51a and 52a are separated from each other so as to keep a certain space between them, applying a specified vibration to at least one of said fractured ductile metal part portions in a direction intersecting the direction of fracture and removing fracture powder 59 stuck on said fracture surfaces 51a and 52a, and thereby enabling the optimum face fitting operation in case of fitting again the fracture surfaces of the fractured ductile metal part to each other.

Abstract: A fracture surface treatment method of a fractured ductile metal part for treating fracture surfaces 51a and 52a of the ductile metal part 50, said fracture surfaces 51a and 52a being fracture surfaces obtained by a fracturing operation of fitting halved mandrel portions into a penetrative bore of the ductile metal part having the penetrative bore and driving a wedge in between the halved mandrel portions, said fracture surface treatment method holding said fractured ductile metal part 50 in a state where said fracture surfaces 51a and 52a are separated from each other so as to keep a certain space between them, applying a specified vibration to at least one of said fractured ductile metal part portions in a direction intersecting the direction of fracture and removing fracture powder 59 stuck on said fracture surfaces 51a and 52a, and thereby enabling the optimum face fitting operation in case of fitting again the fracture surfaces of the fractured ductile metal part to each other.

Abstract: A fracture surface treatment method of a fractured ductile metal part for treating fracture surfaces 51a and 52a of the ductile metal part 50, said fracture surfaces 51a and 52a being fracture surfaces obtained by a fracturing operation of fitting halved mandrel portions into a penetrative bore of the ductile metal part having the penetrative bore and driving a wedge in between the halved mandrel portions, said fracture surface treatment method holding said fractured ductile metal part 50 in a state where said fracture surfaces 51a and 52a are separated from each other so as to keep a certain space between them, applying a specified vibration to at least one of said fractured ductile metal part portions in a direction intersecting the direction of fracture and removing fracture powder 59 stuck on said fracture surfaces 51a and 52a, and thereby enabling the optimum face fitting operation in case of fitting again the fracture surfaces of the fractured ductile metal part to each other.

Abstract: This is a method of forming a fracture start portion of a ductile metal part on an inner circumferential face of a through hole by irradiating laser to an opposing position of the inner circumferential face of the thorough hole of the ductile metal part having a predetermined through hole and by forming a large number of recess portions separated with a predetermined distance at a predetermined interval from one opening to the other opening of the through hole, in which a recess part is formed, instead of by focusing the laser exactly onto the inner circumferential face of the through hole, by irradiating it onto the inner circumferential face of the through hole while defocusing from the inner circumferential face of the through hole by a predetermined amount as well as by supplying an assist gas to a position of the laser irradiation, and the laser is moved linearly at a predetermined speed from one side opening to the other side opening on the inner circumferential face of the through hole while irradiatin

Abstract: A connecting rod fracture machine is disclosed which mateably inserts a half-split type mandrel into an opening of a large end portion of a connecting rod to expand the opening. The machine comprises first and second support members (31), (32) for supporting the connecting rod horizontally, the support members being arranged movably apart from each other on the base of a pallet (24) for placing the connecting rod (1) thereon. Moreover, the machine includes a half-split type mandrel (36), vertically provided on these support members, comprising mandrel half portions (37), (38) with each outer peripheral surface thereof being in contact with the inner surface of the opening. The machine also comprises a wedge (53) for separating the mandrel half portions uniformly apart from each other, the wedge having tapered surfaces in contact with opposite edge surfaces of the mandrel half portions.

Abstract: A connecting rod fracture machine is disclosed which mateably inserts a half-split type mandrel into an opening of a large end portion of a connecting rod to expand the opening. The machine comprises first and second support members (31), (32) for supporting the connecting rod horizontally, the support members being arranged movably apart from each other on the base of a pallet (24) for placing the connecting rod (1) thereon. Moreover, the machine includes a half-split type mandrel (36), vertically provided on these support members, comprising mandrel half portions (37), (38) with each outer peripheral surface thereof being in contact with the inner surface of the opening. The machine also comprises a wedge (53) for separating the mandrel half portions uniformly apart from each other, the wedge having tapered surfaces in contact with opposite edge surfaces of the mandrel half portions.