JPS63248528A - Press die - Google Patents

Press die

Info

Publication number
JPS63248528A
JPS63248528A JP8013587A JP8013587A JPS63248528A JP S63248528 A JPS63248528 A JP S63248528A JP 8013587 A JP8013587 A JP 8013587A JP 8013587 A JP8013587 A JP 8013587A JP S63248528 A JPS63248528 A JP S63248528A
Authority
JP
Japan
Prior art keywords
caulking
core
laminated core
hole
laminated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP8013587A
Other languages
Japanese (ja)
Other versions
JPH0518655B2 (en
Inventor
Tsutomu Ogawa
務 小川
Yasunobu Hirabayashi
平林 康伸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8013587A priority Critical patent/JPS63248528A/en
Publication of JPS63248528A publication Critical patent/JPS63248528A/en
Publication of JPH0518655B2 publication Critical patent/JPH0518655B2/ja
Granted legal-status Critical Current

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  • Manufacture Of Motors, Generators (AREA)

Abstract

PURPOSE:To prevent the inclination of a laminated core caused by a plate thickness deflection of the laminated core, by providing required numbers of neighboring caulking holes and caulking projections to laminate the laminating layers rotatingly by a prescribed angle or prescribed interval. CONSTITUTION:At first, a steel strip 3 is fed intermittently in the direction A positioning a pilot hole 4, then a punching is performed for a slot hole 5 and an inner core diameter 6 of the laminated core 2. The caulking hole 7 and the caulking projection 8 are disposed by the prescribed angle theta of the prescribed interval respectively, when the outer diameter 9 of the laminated core 2 is punched, to position the caulking projection 8 to a enable inserting and press fitting the caulking projection 8 into the caulking hole 7. The die of the press die is rotated by the prescribed angle theta or the prescribed interval to laminate and to fix the laminated core 2, to constitute an iron core 1 of a rotating machine. Therefore, the inclination of the iron core 1 caused by the plate thickness deflection is prevented and the iron core 1 of the rotating machine excellent in the laminating accuracy is obtained.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、積層コアーの板厚偏差により生じる積層鉄
心の傾きを防ぐ回転機鉄心の製造方法に用いて艮好なプ
レス金型に関するものである。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a press mold that is suitable for use in a method for manufacturing a rotating machine core to prevent tilting of a laminated core caused by thickness deviation of the laminated core. be.

〔従来の技術〕[Conventional technology]

第4図は、板厚偏差を有する積層コアーを積層して構成
され1こ回転機鉄心である。
FIG. 4 shows a single rotating machine core constructed by laminating laminated cores having thickness deviations.

第4図において、(1)は回転機鉄心、(2)は回転機
鉄心(1)を構成する積層コアー、(′r)は積j−コ
アー(2)の板厚偏差(Δt)の累積により生じた回転
機鉄心(1)の傾きである。
In Figure 4, (1) is the rotating machine core, (2) is the laminated core that constitutes the rotating machine core (1), and ('r) is the cumulative thickness deviation (Δt) of the product j-core (2). This is the inclination of the rotating machine core (1) caused by.

第5図は、回転機鉄心(1)を構成する積層コアー(2
)の打抜き工程を示す平面図であり、(3)は帯状鋼板
である。
Figure 5 shows the laminated core (2) constituting the rotating machine core (1).
) is a plan view showing the punching process, and (3) is a strip steel plate.

第5図において(3)は、積層コアー(2)を順次打抜
きする帯状鋼板、(4)は帯状鋼板(3)を内方向に送
る時にこの帯状鋼板(3)が所要寸法で正確に次の抜工
程に力)かるまうにするTこめに設けられ1こパイロ・
・・ト穴、(5)はスロ・Jト穴、(6)は積層コアー
(2)の内径、(7) jet m I@ココア−2)
のカシメ穴、(8)はカシメ突起、(9)は積層コアー
(2)の外径である。
In Fig. 5, (3) indicates the steel strip from which laminated cores (2) are punched in sequence, and (4) indicates that when the steel strip (3) is sent inward, the steel strip (3) is exactly the same as the next one with the required dimensions. 1 piece of pyro is installed in the T-piece to make the cutting process easier)
... hole, (5) is the slot/J hole, (6) is the inner diameter of the laminated core (2), (7) jet m I@cocoa-2)
, (8) is the caulking protrusion, and (9) is the outer diameter of the laminated core (2).

次に、動作について説明する。Next, the operation will be explained.

まず、帯状鋼板(3)を矢印fAJ方向にパイロ・シト
穴(4)をパイロ−・トで位置決めして間欠的に送り、
スロ・・・ト穴(5)と積層コアーの内径(6ンの打抜
きを行う。
First, the steel strip (3) is intermittently fed in the direction of the arrow fAJ by positioning the pilot hole (4) with a pilot.
Punch out the slot hole (5) and the inner diameter (6 mm) of the laminated core.

次にカシメ穴(7)の打抜きとカシメ突起(8)の形成
を順次行う。
Next, punching of the caulking hole (7) and formation of the caulking projection (8) are performed in sequence.

尚、カシメ穴(7)は、回転機鉄心(1)をカシメ穴(
7)とカシメ突起(8)とを加圧嵌合して積層固着する
際、相隣接して積層される固定子鉄心(1)を分離させ
゛るためのものであり、このカシメ穴(7)の打抜きは
、相隣接する固定子鉄心(1)の分離面に相当する積層
コアー(2)にのみ、第6図に示すような板カムαOを
駆動装置で作動させることにより、回転機鉄心(1)の
分離用カシメ穴(7)を打抜きするパンチ(6)を打抜
き可能な刃物出代まで移動させて打抜きを行う。
In addition, the caulking hole (7) is the caulking hole (7) for rotating machine iron core (1).
This caulking hole (7) is used to separate the stator cores (1) that are stacked adjacent to each other when the stator core (1) and the caulking projection (8) are press-fitted and fixed together. ) is punched out by operating a plate cam αO as shown in FIG. The punch (6) for punching out the separation caulking hole (7) in (1) is moved to the protrusion of the cutting tool where punching is possible, and punching is performed.

又、カシメ穴(7a)は、カシメ突起(8)の成形と同
時に成形する。最終工程では、積層コアー(2)の外径
(9)の打抜きを行うが、積層コアー(2)に形成し1
こカシメ穴(7)にカシメ突起(8)を嵌合圧入して回
転機鉄心(1)を構成する。
Further, the caulking hole (7a) is formed at the same time as the caulking protrusion (8) is formed. In the final process, the outer diameter (9) of the laminated core (2) is punched out.
The rotating machine core (1) is constructed by fitting and press-fitting the caulking projection (8) into the caulking hole (7).

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の回転機鉄心(1)は、思上のように構成されてい
るので、積層コアー(2)を打抜きする帯状鋼板(3)
に鋼板圧延等の板厚偏差があると、積層し1こ回転機鉄
心が第4図に示すように傾いて積層されることになる問
題点があった。
The conventional rotating machine iron core (1) is constructed in an imaginary manner, so a strip steel plate (3) from which the laminated core (2) is punched is used.
If there is a deviation in plate thickness due to steel plate rolling or the like, there is a problem in that the single laminated rotary machine core is stacked at an angle as shown in FIG.

この発明は、上記のような問題点を解消するため(ζな
されたもので積層コアーのカシメ穴とカシメ突起を嵌合
圧入して積層固着し、回転機鉄心(1)を構成する際積
層固着して積層コアーの板厚偏差による傾きのない回転
機鉄心の打抜き出来るプレス型を得ることを目的として
いる。
In order to solve the above-mentioned problems, this invention is made by fitting and press-fitting the caulking holes and caulking protrusions of the laminated core and laminating and fixing the core (1). The purpose of this invention is to obtain a press die that can punch out a rotating machine core without tilting due to thickness deviation of the laminated core.

〔問題点を解決する1こめの手段〕 この発明によるプレス型は、回転機鉄心の製造方法とし
てカシメ穴とカシメ突起を相隣接するように所定角度或
いは、所定間隔で所要個数だけ配設し、前記カシメ穴に
積層コアーのカシメ突起を嵌合圧入する1こめ、順次積
層コアーを所定角度或いは、所定間隔づつ回転して積層
出来るような構造としγこものである。
[First Means to Solve the Problems] The press die according to the present invention is a method for manufacturing a rotating machine core, and includes arranging a required number of caulking holes and caulking protrusions adjacent to each other at a predetermined angle or at a predetermined interval. After the caulking protrusion of the laminated core is fitted and press-fitted into the caulking hole, the laminated core is sequentially rotated at a predetermined angle or at a predetermined interval to be laminated.

〔作用〕[Effect]

この発明によるプレス型で製造される回転機鉄心は、カ
シメ穴とカシメ突起が相隣接するように配設してあり積
層ファーのカシメ穴にカシメ突起を嵌合圧入する1こめ
積層コアーを順次回転に積層するように打抜きを行う。
The rotating machine core manufactured by the press die according to the present invention has caulking holes and caulking protrusions arranged so as to be adjacent to each other, and the laminated core is sequentially rotated once the caulking protrusions are fitted and press-fitted into the caulking holes of the laminated fur. Punching is performed so that the sheets are stacked on top of each other.

〔発明の実施例〕[Embodiments of the invention]

以下、この発明の一実施例を図について説明する。 An embodiment of the present invention will be described below with reference to the drawings.

第1図は、回転機鉄心を構成する積層コアーの打抜き工
程を示す平面図であり、(3)は積層コアー(2)を順
次打抜きする帯状鋼板、(4)は帯状鋼板(3)をIA
J方向方向Cζ時、この帯状銅板(3)が所要寸法で正
確に次の打抜工程にη)力)るようにするために設けら
れ1こパイロ・リド穴、(5)はスロー、 l−穴、(
6)は積層コアーの内径、(7)は積層コアー(2)の
カシメ穴、(8)はカシメ突起である。(9)は積層コ
アー(2)の外径である。
FIG. 1 is a plan view showing the punching process of a laminated core constituting a rotating machine core, in which (3) is a strip steel plate from which laminated cores (2) are sequentially punched, and (4) is a strip steel plate (3) that is IA
In order to ensure that this strip-shaped copper plate (3) is accurately inserted into the next punching process with the required dimensions in the J-direction Cζ, one pyro lid hole (5) is provided, and the hole (5) is a slow one. −hole, (
6) is the inner diameter of the laminated core, (7) is the caulking hole of the laminated core (2), and (8) is the caulking protrusion. (9) is the outer diameter of the laminated core (2).

次に、動作について説明する。Next, the operation will be explained.

まず、帯状鋼板(3)ヲ矢印rAJ方向にパイロ−・ト
穴(4)ヲパイロ・・・トで位置決めして間欠的に送り
つつスロ・・・ト穴(5)、積層コアー(2)の内径(
6)の打抜きを行う。
First, the strip steel plate (3) is positioned in the direction of arrow rAJ using the pilot hole (4), and while being fed intermittently, the slot hole (5) and the laminated core (2) are inserted. Inner diameter (
6) Perform punching.

次に、カシメ穴(7)の打抜きとカシメ突起(8)の形
成を行う。最終工程では、積層コアー(2)に形成しT
こカシメ穴(7)にカシメ突起(8)を嵌合圧入し、回
転機鉄心(1)を構成するが、積層コアー(2)に形成
し1こカシメ穴(7)とカシメ突起(8)は第2図に示
すように、それぞれ、所定角度(の或いは、所定間隔に
配設されており、積層ファー(2)の外径(9)を打抜
く際、カシメ穴(7)にカシメ突起(8)が嵌合圧入出
来る位置となるように、プレス型のダイ(図示省略)を
所定角度(θ)或いは所定間隔だけ回転させて打抜きを
行い積層コアー(2)を積層固着し、回転機鉄心(1)
を構aする。尚、回転子鉄心(1)全カシメ穴(7)と
カシメ突起(8)とを加圧嵌合し、積層固着して構成す
る際、相隣接して積層される回転子鉄心(1)を分離さ
せるため、回転子鉄心の最下端となる積層コアー(2)
の1〜2枚にカシメ突起(8)を形成する位置にステ穴
(8a)をあける。このステ穴(8a)は、カシメ突起
(8) 71−形成する位置に第6図に示す板カム(1
0を作動させ常時は沈んでいるパンチαDをステ穴(8
a)の打抜き可能なパンチ出代まで移動させて打抜きを
行う ま1こ、上記実施例では、回転機鉄心のうち、固定子鉄
心をごついて説明し1こが、回転子鉄心についても上記
実施例と同様の効果を奏する。
Next, a caulking hole (7) is punched and a caulking projection (8) is formed. In the final process, T is formed on the laminated core (2).
A caulking protrusion (8) is fitted and press-fitted into this caulking hole (7) to form a rotating machine core (1), and one caulking hole (7) and a caulking protrusion (8) are formed in the laminated core (2). As shown in FIG. (8) is in a position where it can be fitted and press-fitted, punching is performed by rotating a press die (not shown) by a predetermined angle (θ) or a predetermined interval, and the laminated core (2) is laminated and fixed. Iron core (1)
Construct. In addition, when forming the rotor core (1) by press-fitting all the caulking holes (7) and the caulking protrusions (8) and laminating and fixing them, the rotor core (1) which is laminated adjacent to each other is The laminated core (2) is the lowest end of the rotor core for separation.
Drill a stem hole (8a) at the position where the caulking protrusion (8) will be formed in one or two of the sheets. The plate cam (1) shown in FIG.
0 is activated and the punch αD, which is normally sunken, is inserted into the stem hole (8
In the above embodiment, the stator core of the rotor core is explained, but the above procedure is also applied to the rotor core. It has the same effect as the example.

尚、回転子鉄心におけるスロー・トのスキュー付けにお
いては、カシメ穴とカシメ突起の配置を隣接スロ、・、
ト間角度だけスキュー付方向に合せて増減し1こ角度で
カシメ穴とカシメ突起を配設するよらにすればよい。
In addition, when skewing the throat in the rotor core, the placement of the caulking holes and caulking protrusions should be arranged in such a way that the adjacent slots...
The crimping hole and the crimping protrusion may be arranged at an angle of 1, which is increased or decreased by the angle between the skewing directions.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、積層コアーのカシメ穴
とカシメ突起とを所定角度、或いは、所定間隔で配設し
、積層コアーの外径を打抜きする際、プレス型のダイを
回転させ、カシメ穴にカシメ突起が嵌合圧入するように
して回転機鉄心を構成するようにし1こので、板厚偏差
による回転機鉄心の傾きが防止でき、積層精度の高い回
転機鉄心が得られる効果がある・
As described above, according to the present invention, the caulking hole and the caulking protrusion of the laminated core are arranged at a predetermined angle or at a predetermined interval, and when punching the outer diameter of the laminated core, the die of the press mold is rotated, The rotating machine core is configured such that the caulking protrusions fit and press-fit into the caulking holes.1 This has the effect of preventing the rotating machine core from tilting due to plate thickness deviation and providing a rotating machine core with high lamination accuracy. be·

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例Cζまる回転機鉄心を構成
する積層ファーの打抜き工程を示す平面図、第2図は、
この発明の一実施例による積層コアーの平面図、第8図
はこの発明の一実施例による、カシメ部を示す部分断面
図、第4図は従来の積層方法による回転機鉄心の側面図
、第5図は従来の積層コアーの打抜き工程を示す平面図
、第6図は一般的に用いられているパンチ駆動部を示す
平面図である。 図において、(1)は回転機鉄心、(2)は積層コアー
、(7)はカシメ穴、(8)はカシメ突起、(θ)は所
定角度である。 なお、図中、同一符号は同一、ま1こは相当部分を示す
FIG. 1 is a plan view showing the punching process of laminated fur constituting the rotary machine core according to an embodiment of the present invention, and FIG.
FIG. 8 is a plan view of a laminated core according to an embodiment of the present invention; FIG. 8 is a partial cross-sectional view showing a caulking portion according to an embodiment of the present invention; FIG. FIG. 5 is a plan view showing a conventional punching process for a laminated core, and FIG. 6 is a plan view showing a commonly used punch drive unit. In the figure, (1) is a rotating machine core, (2) is a laminated core, (7) is a caulking hole, (8) is a caulking protrusion, and (θ) is a predetermined angle. In addition, in the figures, the same reference numerals indicate the same parts, and squares indicate corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 積層コアーにカシメ穴とカシメ突起を設け、カシメ穴に
カシメ突起を順次嵌合圧入して構成する回転機鉄心を製
造するプレス型において、積層するコアーにカシメ穴と
カシメ突起を相隣接するように所定角度或いは、所定間
隔で所要個数だけ配設するように打抜き、成形する工程
と前記カシメ穴に積層するコアーのカシメ突起を嵌合圧
入出来るように、順次、積層コアーを所定角度或いは、
所定間隔づつ回転して積層固着するようにした抜工程と
を有することを特徴とするプレス型。
In a press mold for manufacturing a rotating machine core, which is constructed by providing a laminated core with caulking holes and caulking protrusions, and sequentially fitting and press-fitting the caulking protrusions into the laminated cores, the laminated cores are provided with caulking holes and caulking protrusions adjacent to each other. A process of punching and forming the required number of cores at a predetermined angle or at a predetermined interval, and sequentially inserting the laminated cores at a predetermined angle or at a predetermined interval so that the caulking protrusions of the laminated cores can be fitted and press-fitted into the caulking holes.
1. A press mold comprising a punching step in which the molds are rotated at predetermined intervals and stacked and fixed.
JP8013587A 1987-04-01 1987-04-01 Press die Granted JPS63248528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8013587A JPS63248528A (en) 1987-04-01 1987-04-01 Press die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8013587A JPS63248528A (en) 1987-04-01 1987-04-01 Press die

Publications (2)

Publication Number Publication Date
JPS63248528A true JPS63248528A (en) 1988-10-14
JPH0518655B2 JPH0518655B2 (en) 1993-03-12

Family

ID=13709803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8013587A Granted JPS63248528A (en) 1987-04-01 1987-04-01 Press die

Country Status (1)

Country Link
JP (1) JPS63248528A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003055682A1 (en) * 2001-12-25 2003-07-10 Institute Of Technology Precision Electrical Discharge Work's Method and system for producing laminate
JP2008253135A (en) * 2008-07-09 2008-10-16 Mitsui High Tec Inc Laminated core
WO2012174629A3 (en) * 2011-06-22 2014-06-05 Whirlpool S.A. Stack of metallic laminations, metallic lamination and process for forming a lamination stack
CN113226586A (en) * 2018-12-24 2021-08-06 罗伯特·博世有限公司 Method for producing a stack of stacked metal parts comprising a multi-layer blanking process step
JP2022061068A (en) * 2020-10-06 2022-04-18 三菱電機株式会社 Manufacturing method and manufacturing apparatus of core element, and manufacturing method of split lamination core
WO2024057837A1 (en) * 2022-09-13 2024-03-21 株式会社デンソー Rotary electric machine core and rotary electric machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56129557A (en) * 1980-03-14 1981-10-09 Mitsui Haitetsuku:Kk Manufacture of laminated core for stator
JPS5725956A (en) * 1980-06-16 1982-02-10 Ibm Manufacture of uniform laminated structure
JPS59164459U (en) * 1983-04-18 1984-11-05 株式会社東芝 Stator core of rotating electric machine
JPS62107404U (en) * 1985-12-25 1987-07-09
JPS62172245U (en) * 1986-04-18 1987-10-31

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56129557A (en) * 1980-03-14 1981-10-09 Mitsui Haitetsuku:Kk Manufacture of laminated core for stator
JPS5725956A (en) * 1980-06-16 1982-02-10 Ibm Manufacture of uniform laminated structure
JPS59164459U (en) * 1983-04-18 1984-11-05 株式会社東芝 Stator core of rotating electric machine
JPS62107404U (en) * 1985-12-25 1987-07-09
JPS62172245U (en) * 1986-04-18 1987-10-31

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003055682A1 (en) * 2001-12-25 2003-07-10 Institute Of Technology Precision Electrical Discharge Work's Method and system for producing laminate
US6852189B2 (en) 2001-12-25 2005-02-08 Institute Of Technology Precision Electrical Discharge Work's Method and apparatus for manufacturing laminates
JP2008253135A (en) * 2008-07-09 2008-10-16 Mitsui High Tec Inc Laminated core
WO2012174629A3 (en) * 2011-06-22 2014-06-05 Whirlpool S.A. Stack of metallic laminations, metallic lamination and process for forming a lamination stack
US9768653B2 (en) 2011-06-22 2017-09-19 Whirlpool S. A. Process for the formation of a stack of superposed metallic laminations
US10170948B2 (en) 2011-06-22 2019-01-01 Whirlpool S.A. Process for the formation of a stack of superposed metallic laminations
US10411533B2 (en) 2011-06-22 2019-09-10 Embraco Industria de Compressores e Solucoes em Refrigeracao Ltda. Process for the formation of a stack of superposed metallic laminations
CN113226586A (en) * 2018-12-24 2021-08-06 罗伯特·博世有限公司 Method for producing a stack of stacked metal parts comprising a multi-layer blanking process step
JP2022061068A (en) * 2020-10-06 2022-04-18 三菱電機株式会社 Manufacturing method and manufacturing apparatus of core element, and manufacturing method of split lamination core
US11843289B2 (en) 2020-10-06 2023-12-12 Mitsubishi Electric Corporation Method for manufacturing a core element for an electric machine
WO2024057837A1 (en) * 2022-09-13 2024-03-21 株式会社デンソー Rotary electric machine core and rotary electric machine

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