US 12,251,747 B2
Manufacturing method of plate member
Masahiro Shiotani, Sagamihara (JP)
Assigned to DAIWA CAN COMPANY, Chiyoda-ku (JP)
Appl. No. 17/907,369
Filed by DAIWA CAN COMPANY, Chiyoda-ku (JP)
PCT Filed Jan. 29, 2021, PCT No. PCT/JP2021/003145
§ 371(c)(1), (2) Date Sep. 26, 2022,
PCT Pub. No. WO2021/192604, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-058741 (JP), filed on Mar. 27, 2020.
Prior Publication US 2023/0123829 A1, Apr. 20, 2023
Int. Cl. B21D 22/02 (2006.01); B21D 28/04 (2006.01); B21D 28/06 (2006.01); B21D 28/26 (2006.01); B21D 37/08 (2006.01); B21D 43/05 (2006.01)
CPC B21D 22/02 (2013.01) [B21D 28/26 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of manufacturing plate members sequentially by feeding a strip material at a given pitch to a press machine in which a progressive stamping die having a plurality of stations is placed, and stamping the strip material at each of the stations of the die, comprising:
obtaining a displacement of a pilot hole pierced in the strip material caused by the stamping of the strip material;
determining a shape of the pilot hole or a position of a pilot pin of the die such that the pilot pin is inserted into the pilot hole after being displaced while being brought into contact with an inner edge of the displaced pilot hole;
piercing the pilot hole having the determined shape in the strip material, or adjusting the position of the pilot pin to the determined position; and
stamping the strip material by a plurality of operations while bringing the pilot pin into contact with the inner edge of the pilot hole at an operation of the plurality of operations before the pilot hole is displaced, and at an operation of the plurality of operations after the pilot hole is displaced,
wherein at least one of the operations of the plurality of operations includes a compressing operation to depress the strip material, or a shearing operation to pierce a desired portion of the strip material, and
the strip material is positioned by bringing a plug arranged in the press machine into contact with a side wall of a recess formed by the compressing operation, or bringing the plug into contact with an inner edge of a through hole formed by the shearing operation.
 
6. A method of manufacturing plate members sequentially by feeding a strip material at a given pitch to a press machine in which a progressive stamping die having a plurality of stations is placed, and stamping the strip material at each of the stations of the die, comprising:
obtaining a displacement of a pilot hole pierced in the strip material caused by the stamping of the strip material;
determining a shape of the pilot hole or a position of a pilot pin of the die such that the pilot pin is inserted into the pilot hole after being displaced while being brought into contact with an inner edge of the displaced pilot hole;
piercing the pilot hole having the determined shape in the strip material, or adjusting the position of the pilot pin to the determined position; and
stamping the strip material by a plurality of operations while bringing the pilot pin into contact with the inner edge of the pilot hole at an operation of the plurality of operations before the pilot hole is displaced, and at an operation of the plurality of operations after the pilot hole is displaced,
wherein the displacement of the pilot hole is obtained by the stamping of the strip material by the plurality of operations in advance,
wherein at least one of the operations of the plurality of operations includes a compressing operation to depress the strip material, or a shearing operation to pierce a desired portion of the strip material, and
the strip material is positioned by bringing a plug arranged in the press machine into contact with a side wall of a recess formed by the compressing operation, or bringing the plug into contact with an inner edge of a through hole formed by the shearing operation.