Abstract:
A forging apparatus 1A includes a swaging apparatus 2 equipped with a fixing die 10, a guide 20 having an insertion passage 22 for inserting and holding a bar-shaped raw material 5 in a buckling preventing state, and a punch 30. The raw material 5 is fixed to the fixing die 10 with the one end portion of the raw material protruded. The one end portion of the raw material 5 is inserted into the insertion passage 22 of the guide 20. Thereafter, while pressing the raw material 5 with the punch 30 in the axial direction, in a state in which an entire peripheral surface of the exposed portion 8 of the raw material 5 exposed between the guide 20 and the fixing die 10 is not restrained, the guide 20 is moved in a direction opposite to the moving direction of the punch 30 so that a length of the exposed portion 8 of the raw material 5 becomes a budding limit length or less at a cross-sectional area of the exposed portion 8 of the raw material 5. Thus, the one end portion of the raw material 5 is subjected to swaging processing.
Abstract:
A tool for removing damaged fasteners and a method for making such tool. A portion (46) of inside surface (40) of tool (10) is in the shape of a hexagonal frustum (54) that includes spiral splines (25). Splines (25) have constant depth between the major end (58) and the minor end (56) of frustum (54) and the relief angle (£) of splines (25) increases in the direction from minor end (56) toward major end (58). In the method for making the tool (10), a tubular section (118) is made from a tapered blank (91) by piercing one end of the tapered blank with a pierce punch (132). The tubular section is then driven onto a splined punch (162) to provide a splined tubular section (165) having splines in one end. The splined tubular section is then extruded through a round-to-hexagonal extrusion insert (182) to provide a splined polygonal section (173) having an inner surface with a tapered, hexagonal shape. A modified round-to-hexagonal extrusion insert (206) provides a tool with corners (202) on the polygonal surface. A modified tool (310) with splines (325) in a clockwise spiral is used to secure tamper-resistant fasteners.
Abstract:
A tool for removing damaged fasteners and a method for making such tool wherein the tool (10) includes a first end (12) and a second end (14) with an outside surface (32) and an inside surface (40) defined between ends (12) and (14). A portion (46) of inside surface (40) is in the shape of an hexagonal frustum (54) that has a major end (58) and that includes spiral splines (25). Splines (25) have constant depth between the major end (58) and the minor end (56) of frustum (54) and the relief angle ( POUND ) of splines (25) decreases in the direction from minor end (56) toward major end (58). In the method for making the tool (10), a tubular section (118) is made from a tapered blank (91) by piercing one end of the tapered blank with a pierce punch (132). One end of the tubular section is then driven onto a splined punch (162) to provide splines in one end of the tubular section. The tubular section is then stripped off of the punch (162) by a kickout sleeve (166) and extruded through a round-to-hexagonal extrusion insert (182) to provide portion (46) of the inner surface (40) with a tapered, hexagonal shape.
Abstract:
A method of making a recess (58) in a drive socket (100) and the like includes forming a groove (72) to extend along a face of an elongated drive opening (66) in a metal workpiece (38) from one end of its drive opening (66), moving material from the surface of the groove (72) to increase its depth from its outer end along only a portion of its length and gathering the material so moved from the groove surface to form a ledge (90) between ends of the groove (72), whereby a recess (58) is defined by the groove extending beyond the ledge (90). In addition, a female drive device for socket wrenches and the like is disclosed having an elongated drive opening (66), a groove (72) longitudinally extending from one end of the drive opening (66) along a face of the drive opening, and a ledge (90) between ends of the groove (72a). The ledge (90) protrudes radially inwardly such that a recess (58) is defined by the groove extending beyond the ledge (90) for retaining a male drive member.