Method for manufacturing stator core and apparatus for manufacturing stator core
AssigneeToyota Boshoku Kabushiki Kaisha
InventorYuka NAKAI
Life of this patent
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Abstract
A method for manufacturing a stator core includes punching out a center hole scrap from a workpiece, thereby forming a first through-hole that forms a center hole, and punching out multiple slot scraps from the workpiece in which the first through-hole has been formed, thereby forming multiple second through-holes that respectively form the multiple slots. The punching out the center hole scrap from the workpiece includes a deformation process. The deformation process is performed only on at least one of inner surfaces of support portions. The inner surfaces of the support portions are parts of the inner surface of the die hole. The support portions are parts of the die that support portions of the workpiece in which the second through-holes are to be formed.
Claims6
A method for manufacturing a stator core, the stator core including a center hole and multiple slots, the slots being continuous with the center hole and spaced apart from each other in a circumferential direction of the center hole, and the stator core being formed by stacking multiple core pieces punched out from a workpiece, the method comprising:
- punching out a center hole scrap from the workpiece through cooperation of a punch and a die that includes a die hole in which the punch moves back and forth, thereby forming a first through-hole that forms the center hole;
- and
- punching out multiple slot scraps from the workpiece in which the first through-hole has been formed, thereby forming multiple second through-holes that respectively form the multiple slots, wherein
- the punching out the center hole scrap from the workpiece includes a deformation process that plastically deforms the center hole scrap by sliding the center hole scrap on a scrap-rising suppressing portion provided on an inner surface of the die hole, thereby increasing a frictional force between the inner surface of the die hole and the center hole scrap, and
- the deformation process is performed only on at least one of inner surfaces of support portions, the inner surfaces of the support portions being parts of the inner surface of the die hole, and the support portions being parts of the die that support portions of the workpiece in which the second through-holes are to be formed.
An apparatus for manufacturing a stator core, the stator core including a center hole and multiple slots, the slots being continuous with the center hole and spaced apart from each other in a circumferential direction of the center hole, and the stator core being formed by stacking multiple core pieces punched out from a workpiece, the apparatus comprising:
- a first punching station that includes a punch and a die that includes a die hole in which the punch moves back and forth, the first punch-out station being configured to punch out a center hole scrap from the workpiece through cooperation of the punch and the die, thereby forming a first through-hole that forms the center hole;
- and
- a second punching station that is configured to punch out multiple slot scraps from the workpiece in which the first through-hole has been formed, thereby forming multiple second through-holes that respectively form the multiple slots, wherein
- a scrap-rising suppressing portion is provided on an inner surface of the die hole, the scrap-rising suppressing portion plastically deforming the center hole scrap by sliding the center hole scrap on the scrap-rising suppressing portion, thereby increasing a frictional force between the inner surface of the die hole and the center hole scrap,
- the die includes support portions that are configured to support portions of the workpiece in which the second through-holes are to be formed, the support portions each having an inner surface that is a part of the inner surface of the die hole, and
- the scrap-rising suppressing portion is provided only on the inner surface of at least one of the support portions.
Dependencies are inferred from the claim text.