Method for manufacturing a cup-shaped member, cup-shaped member, and motor

Abstract

The present invention provides a method for manufacturing a cup-shaped member that can suppress the decrease in the accuracy of the inner diameter of the inner circumferential wall caused by the reduction in plate thickness during manufacturing. [Solution] The manufacturing method comprises a first step of obtaining a first intermediate molded product (10A) including a body (11) and a head (12); a second step of obtaining a second intermediate molded product (10B) in which a recess (129) is formed in the head (12) by pushing a part of the head (12) inward into the first intermediate molded product (10A); and a third step of obtaining a cup-shaped member (10) in which a folded partition (123) is formed in the head (12) by pushing a part of the head (12) outward into the second intermediate molded product (10B) at the position of the recess (129). In the first intermediate molded product (10A), the width (D1) of the central part (126) of the head (12) S ) is the width of the torso (11) (D1 L Smaller than ). Width of the central part (126) (D1 S ) is greater than the width (D2) of the recess (129) in the second intermediate molded product (10B).

Claims

1. A method for manufacturing a cup-shaped member, A first step involves drawing a metal plate to obtain a first intermediate molded product which includes a cylindrical body and a head that seals one end of the body in the axial direction and has a shape that protrudes outward from the body in the axial direction, A second step involves pressing a portion of the head toward the inside of the first intermediate molded product to obtain a second intermediate molded product in which a recess is formed in the head, A third step to obtain a cup-shaped member in which a folded partition wall portion is formed on the head, which includes an inner circumferential wall, an outer circumferential wall disposed on the outer circumferential side of the inner circumferential wall, and a folded portion connecting the inner circumferential wall and the outer circumferential wall, by pushing a part of the head toward the outside of the second intermediate molded product at the position of the recess, Equipped with, In the first intermediate molded product, the head includes a central portion located on the outside of the body in the axial direction, and an outer peripheral portion located on the outer periphery of the central portion and connecting the central portion to the body. In the cross-section of the first intermediate molded product including the central axis of the body, the width of the central portion is smaller than the width of the body. A manufacturing method wherein the width of the central portion is greater than the width of the bottom of the recess in the cross-section of the second intermediate molded product including the central axis.

2. A manufacturing method according to claim 1, The width of the central portion is D1 Ｓ The width of the torso is D1 Ｌ In this case, 0.67 ≤ D1 Ｓ / D1 Ｌ The manufacturing method.

3. A manufacturing method according to claim 1, The width of the central portion is D1 Ｓ The width of the torso is D1 Ｌ In that case, D1 Ｓ / D1 Ｌ A manufacturing method where the result is ≤0.

95.

4. A manufacturing method according to claim 1, Let the width of the central part be D1 Ｓ When the width of the bottom part is D2, a manufacturing method satisfying 1.25 ≤ D1 Ｓ / D2

5. A manufacturing method according to claim 1, The width of the central portion is D1 Ｓ When the width of the bottom is D2, D1 Ｓ A manufacturing method where / D2 ≤ 1.

78.

6. The manufacturing method according to claim 1, further, A manufacturing method comprising, after the third step, a fourth step of flattening the portion of the head that is located inside the folded partition wall and the portion of the head that is located outside the folded partition wall.

7. A cup-shaped member, A cylindrical body, The head portion includes a first top wall, a second top wall positioned on the outer circumference of the first top wall when viewed along the axial direction, and a folded partition portion positioned between the first top wall and the second top wall when viewed along the axial direction, which seals one end of the axial direction of the body portion. Equipped with, The aforementioned folded partition wall section is A cylindrical inner circumferential wall is positioned inside the cup-shaped member relative to the first top wall, A cylindrical outer wall is positioned on the inside of the cup-shaped member and on the outer circumference side of the inner circumferential wall relative to the second top wall, A folded portion connecting the inner circumferential wall and the outer circumferential wall on the opposite side of the first top wall and the second top wall, Includes, The head portion is a cup-shaped member having a portion on the outer side of the inner circumferential wall where the plate thickness is smallest.

8. A cup-shaped member according to claim 7, The cup-shaped member is a cup-shaped member that constitutes at least a part of the motor case.

9. It is a motor, The cup-shaped member according to claim 8, A motor body including a stator, a rotor positioned on the inner circumference of the stator and configured to rotate together with the shaft around a central axis, and bearings supporting the shaft, Equipped with, The bearing is located within the inner circumferential wall of the motor.

Images