Device for manufacturing laminated iron core and method for manufacturing laminated iron core

Patent metadata

Field	Value
Publication number	US-11524327-B2
Application number	US-202016997322-A
Country	US
Kind code	B2
Filing date	Aug 19, 2020
Priority date	Sep 3, 2019
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

A device for manufacturing a laminated iron core includes: a punch unit configured to form protrusions, and including N number of punches as a set, the N being a natural number larger than M; and N number of auxiliary punches. The N number of auxiliary punches are configured such that L number of auxiliary punches selected from the N number of auxiliary punches performs a nullification processing on a metal sheet, the nullification processing being configured to nullify a processing with the L number of punches among the N number of punches, the L being the natural number that is obtained by subtracting the M from the N. According to the above configurations, for example, since a processing position with the plurality of punches is limited in one position, a positional accuracy of protrusions formed in punched members with the plurality of punches is improved.

First claim

What is claimed is:

1. A device for manufacturing a laminated iron core by punching out a plurality of punched members from a metal sheet and laminating the plurality of punched members while being rotated, the plurality of punched members having an annular shape and having M number of protrusions provided on an inner peripheral edge or an outer peripheral edge of the plurality of punched members, the M being a natural number of 1 or more, the device comprising:
a punch unit configured to form the protrusions, and including punches in an amount of N number as a set, the N being the natural number larger than the M;
auxiliary punches in the amount of N number,
wherein the N number of auxiliary punches are configured such that L number of auxiliary punches selected from the N number of auxiliary punches performs a nullification processing on the metal sheet, the nullification processing being configured to nullify a processing with the L number of punches among the N number of punches, the L being the natural number that is obtained by subtracting the M from the N; and

a blanking punch that punches the metal sheet without punching the formed protrusions to perform a blanking process on the inner peripheral edge or the outer peripheral edge of the plurality of punched members.

2. The device according to claim 1 ,
wherein the punch unit is arranged at a downstream side from the N number of auxiliary punches.

3. The device according to claim 1 , further comprising:
an auxiliary punch unit including the N number of auxiliary punches as a set,
wherein the N number of auxiliary punches are individually operable.

4. The device according to claim 1 ,
wherein the N number of auxiliary punches include:
at least one auxiliary punch arranged at a relatively upstream side of the metal sheet; and
another auxiliary punch arranged at a downstream side from the at least one auxiliary punch so as to perform the nullification processing on the metal sheet at a timing different from the at least one auxiliary punch.

5. The device according to claim 1 , further comprising:
a drive mechanism configured to laminate the plurality of punched members punched out from the metal sheet while being rotated such that the protrusions overlap with each other in a height direction.

6. A method for manufacturing a laminated iron core by punching out a plurality of punched members from a metal sheet and laminating the plurality of punched members while being rotated, the plurality of punched members having an annular shape and having M number of protrusions provided on an inner peripheral edge or an outer peripheral edge of the plurality of punched members, the M being a natural number of 1 or more, the method comprising:
processing the metal sheet with a punch unit of forming the protrusions, and including punches in an amount of N number as a set, the N being a natural number larger than the M;
performing a nullification processing on the metal sheet with L number of auxiliary punches selected from auxiliary punches in the amount of N number so as to nullify a processing with the L number of punches among the N number of punches, the L being the natural number that is obtained by subtracting the M from the N; and
performing a blanking process on the inner peripheral edge or the outer peripheral edge of the plurality of punched members by a blanking punch that punches the metal sheet without punching the formed protrusions.

7. The method according to claim 6 ,
wherein the processing on the metal sheet with the punch unit is performed after the performing of the nullification processing on the metal sheet with the L number of auxiliary punches.

8. The method according to claim 6 ,
wherein the N number of auxiliary punches are grouped in a set as an auxiliary punch unit, and
wherein the N number of auxiliary punches are individually operable.

9. The method according to claim 6 ,
wherein the N number of auxiliary punches include:
at least one auxiliary punch arranged at a relatively upstream side of the metal sheet; and
another auxiliary punch arranged at a downstream side from the at least one auxiliary punch so as to perform the nullification processing on the metal sheet at a timing different from the at least one auxiliary punch.

10. The method according to claim 6 , further comprising:
laminating the plurality of punched members punched out from the metal sheet while being rotated such that the protrusions overlap with each other in a height direction.

Assignees

• Mitsui High Tec

Inventors

• Maruyama Takashi

Classifications

• H02K15/02

  of stator or rotor bodies · CPC title

• B21D28/22 Primary

  Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines · CPC title

• B21D28/20

  Applications of drives {for reducing noise or wear} · CPC title

• B21D28/06

  Making more than one part out of the same blank; Scrapless working · CPC title

• H02K1/146

  consisting of a generally annular yoke with salient poles · CPC title