Method for manufacturing bearing ring member
OwnerNobuyuki Hagiwara, Kenji Tezukainventors
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Abstract
A method for manufacturing a bearing ring member includes an inversion step of sandwiching a workpiece including a workpiece body portion having an annular shape between a punch disposed on a first side in an axial direction and a die disposed on a second side opposite to the first side, and deforming the workpiece such that the workpiece body portion has a cylindrical shape. The inversion step includes, in the following order, a first step of deforming the workpiece using the punch and the die in a state where no sliding occurs between the workpiece and the die, and a second step of deforming the workpiece using the punch and the die in a state where a sliding occurs between the workpiece and the die.
Claims20
A method for manufacturing a bearing ring member, the method comprising:
- an inversion step of sandwiching a workpiece including a workpiece body portion having an annular shape between one or more punches disposed on a first side in an axial direction and a plurality of dies disposed on a second side opposite to the first side, and deforming the workpiece using the one or more punches and the plurality of dies such that the workpiece body portion has a cylindrical shape,
- wherein the inversion step includes, in the following order, a first step of deforming the workpiece using a first die of the plurality of dies in a state where no sliding occurs between the workpiece and the first die, and a second step of deforming the workpiece using a second die of the plurality of dies in a state where a sliding occurs between the workpiece and the second die, and
- a bending moment acting on the workpiece in the first step is smaller than a predicted value M of a limiting bending moment of the workpiece body portion calculated by Formula (1),
- M
- =
- W
- W
- ×
- t
- 2
- 4
-
- Y
- (
- 1
- )
- where WW is a width of the workpiece body portion, t is a thickness of the workpiece body portion, and Y is a yield stress of the workpiece body portion.
A method for manufacturing a bearing ring member using an inversion process, the method comprising:
- sandwiching a workpiece including a workpiece body portion having an annular shape between one or more punches disposed on a first side in an axial direction and a plurality of dies disposed on a second side opposite to the first side;
- deforming the workpiece a first time, while sandwiching the workpiece, using a first die of the plurality of dies in a state where no sliding occurs between the workpiece and the first die;
- and
- deforming the workpiece a second time, while sandwiching the workpiece, using a second die of the plurality of dies in a state where a sliding occurs between the workpiece and the second die,
- wherein a surface roughness of a second contact surface of the second die which comes into contact with the workpiece is smaller than a surface roughness of a first contact surface of the first die which comes into contact with the workpiece.
A method for manufacturing a bearing ring member using an inversion process, the method comprising:
- sandwiching a workpiece including a workpiece body portion having an annular shape between one or more punches disposed on a first side in an axial direction and a plurality of dies disposed on a second side opposite to the first side;
- deforming the workpiece a first time, while sandwiching the workpiece, using a first die of the plurality of dies in a state where no sliding occurs between the workpiece and the first die;
- and
- deforming the workpiece a second time, while sandwiching the workpiece, using a second die of the plurality of dies in a state where a sliding occurs between the workpiece and the second die,
- wherein a Rockwell C scale hardness of a second contact surface of the second die which comes into contact with the workpiece is larger than a Rockwell C scale hardness of a first contact surface of the first die which comes into contact with the workpiece.
Dependencies are inferred from the claim text.