Abstract: A die assembly having a guide rod that includes a lower rod which is fixedly placed on a stripper plate which guides a punch for engagement with a lower die and an upper rod which is placed removably on the stripper plate for engagement with an upper die. When punching a material for punching, the upper rod is removed from the stripper plate so as to put the upper plate and the stripper plate in a disconnected state, i.e., so that the stripper plate is made free to move backwards and forwards relative to the lower die by the lower rod. When the material for punching is not punched, the upper rod is attached to the stripper plate so as to put the upper die and the stripper plate in a connected state by the upper rod, so that the stripper plate is held on to the upper die.

Abstract: A method of producing a laminated variant-shaped core 10, includes punching out core sheets 12-14 from a strip 11 to form the outlines of the core sheets 12-14, and push back the punched out core sheets 12-14 into the strip 11; forming cutouts 28, 30 and 32 reaching outer peripheries of outer plates 27, 29 and 31, the outer plates 27, 29 and 31 being the same in outer shape and respectively containing thereinside the core sheets 12-14, the cutouts 28, 30 and 32 having inner edges respectively in contact with the core sheets 12-14; forming caulking portions 21 in each of the core sheets 12-14 and caulking portions 33 in each of the outer plates 27, 29 and 31; punching out the outer plates 27, 29 and 31 from the strip 11 to form the outlines of the outer plates 27, 29 and 31, and laminating and interlocking the core sheets 12-14 to form the variant-shaped laminated core 10 and laminating and interlocking the outer plates 27, 29 and 31; and removing the outer plates 27, 29 and 31 located outside the laminated an

Abstract: There is provided a method for manufacturing a stator core for an axial air-gap electronic motor, in which core sheets are laminatedly fixed while being shifted with predetermined intervals. The method includes a step in which first side surfaces in the circumferential direction (first slot surfaces 25) of the first to nth (n is a positive integer) core sheets are blanked out of a mother sheet 60 by moving first blanking punches 360 with predetermined intervals via a first control means 700; and a second blanking step in which second side surfaces in the circumferential direction (second slot surfaces 26) of the first to nth (n is a positive integer) core sheets are blanked in succession by moving a second blanking punch 460 with predetermined intervals via a second control means 700.

Abstract: With a view to preventing the generation of a punching failure or damage to punches or a die which is attributed to inclination or sideways movement of a press ram when a punching operation is performed, while preventing damage to the punches which is attributed to sideways movement or inclination of a stripper plate when no punching operation is performed and facilitating maintenance work such as adjustment of punches for registration with the stripper plate, there is provided a die assembly comprising an upper die including a punch and a lower die including a die wherein the upper die mounted on a press ram is connected to the lower die via a die-set guide so as to move backwards and forwards and a material for punching which is pressed against the lower die by a stripper plate is punched through reciprocation of the upper die relative to the lower die, the die assembly being characterized by comprising a guide rod made up of a lower rod which is fixedly placed on the stripper plate which guides the punch f

Abstract: A method of producing a laminated variant-shaped core 10, comprising: Step A of punching out a required number of core sheets 12-14 for each of plural types, from a strip 11 to be processed, to form the outlines of the core sheets 12-14, and push back the punched out core sheets 12-14 into the strip 11; Step B of forming cutouts 28, 30 and 32 reaching outer peripheries of outer plates 27, 29 and 31, the outer plates 27, 29 and 31 being the same in outer shape and respectively containing thereinside the core sheets 12-14, the cutouts 28, 30 and 32 having inner edges respectively in contact with the core sheets 12-14; Step C of forming caulking portions 21 in each of the core sheets 12-14 and caulking portions 33 in each of the outer plates 27, 29 and 31; Step D of punching out the outer plates 27, 29 and 31 from the strip 11 to form the outlines of the outer plates 27, 29 and 31, and laminating and interlocking the core sheets 12-14 to form the variant-shaped laminated core 10 and laminating and interlocking t

Abstract: A laminated core formed by reliably and firmly connecting laminated core segments (10) in an annular form by first and second joining sections (19, 20) thereof, the first and second joining sections (19, 20) formed by alternately laminating sets of core segment sheets (21) and sets of core segment sheets (22), each set consisting of a predetermined number of sheets, the core segment sheets having brimmed concavities (24, 25) and brimmed convexities (23, 26) located at both ends of yoke-segment pieces (27, 36), wherein each laminated core segment (10) has round corners formed at both sides of a magnetic pole shaft section (12) and radially outward sides of a magnetic pole tooth section (13) at lower and upper laminated portions of the laminated core segment (10), thereby preventing damage to wires wound around the magnetic pole shaft section (12).

Abstract: A laminated core formed by reliably and firmly connecting laminated core segments (10) in an annular form by first and second joining sections (19, 20) thereof, the first and second joining sections (19, 20) formed by alternately laminating sets of core segment sheets (21) and sets of core segment sheets (22), each set consisting of a predetermined number of sheets, the core segment sheets having brimmed concavities (24, 25) and brimmed convexities (23, 26) located at both ends of yoke-segment pieces (27, 36), wherein each laminated core segment (10) has round corners formed at both sides of a magnetic pole shaft section (12) and radially outward sides of a magnetic pole tooth section (13) at lower and upper laminated portions of the laminated core segment (10), thereby preventing damage to wires wound around the magnetic pole shaft section (12).

Abstract: There is provided a method for manufacturing a stator core for an axial air-gap electronic motor, in which core sheets are laminatedly fixed while being shifted with predetermined intervals. The method includes a step in which first side surfaces in the circumferential direction (first slot surfaces 25) of the first to nth (n is a positive integer) core sheets are blanked out of a mother sheet 60 by moving first blanking punches 360 with predetermined intervals via a first control means 700; and a second blanking step in which second side surfaces in the circumferential direction (second slot surfaces 26) of the first to nth (n is a positive integer) core sheets are blanked in succession by moving a second blanking punch 460 with predetermined intervals via a second control means 700.