JPH0530711A - Forging and molding method for forged and molded item - Google Patents
Forging and molding method for forged and molded itemInfo
- Publication number
- JPH0530711A JPH0530711A JP8787691A JP8787691A JPH0530711A JP H0530711 A JPH0530711 A JP H0530711A JP 8787691 A JP8787691 A JP 8787691A JP 8787691 A JP8787691 A JP 8787691A JP H0530711 A JPH0530711 A JP H0530711A
- Authority
- JP
- Japan
- Prior art keywords
- forged
- iron core
- field
- forging
- molding
- 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.)
- Pending
Links
Landscapes
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、車両用スタータモータ
の界磁鉄芯その他これに類似した外形形状を有する鍛造
成形品を鍛造成形するに適した鍛造成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging method suitable for forging a field iron core of a vehicle starter motor and other forged products having an outer shape similar to this.
【０００２】[0002]
【従来技術】従来、例えば、車両に採用されるスタータ
モータにおいて、ステータのヨーク１０の内周壁に溶接
すべき界磁鉄芯２０は、通常、図４（Ａ）（Ｂ）に示す
ごとく、偏平直方体形状のポール２１と、このポール２
１に設けた鍔状のポールシュー２２とを有するように丸
棒状界磁鉄芯材料から鍛造成形されており、ポールシュ
ー２２は、ポール２１の基部からその長手方向に直交す
るように両側に向け円筒壁状に延出している。2. Description of the Related Art Conventionally, for example, in a starter motor used in a vehicle, a field iron core 20 to be welded to an inner peripheral wall of a yoke 10 of a stator is generally flat as shown in FIGS. 4 (A) and 4 (B). A rectangular parallelepiped pole 21 and this pole 2
1 is formed by forging from a round bar-shaped field iron core material so as to have a brim-shaped pole shoe 22. The pole shoe 22 faces both sides from the base of the pole 21 so as to be orthogonal to its longitudinal direction. It extends like a cylindrical wall.
【０００３】[0003]
【発明が解決しようとする課題】ところで、このように
構成した界磁鉄芯２０のポール２１に界磁巻線を巻装し
た場合、この界磁巻線のポール２１の両長手方向外壁に
沿う各巻線部分は、ポールシュー２２のポール２１の両
長手方向外壁からの各延出部分によってポール２１の両
長手方向外壁上に適確に位置決めされる。しかしなが
ら、前記界磁巻線の残余の各巻線部分は、ポールシュー
２２の各延出部分からポール２１の各長手方向外壁に沿
い外方へ突出してしまい、ステータのヨークの軸芯側に
向け屈曲したりする。従って、上述の界磁巻線の残余の
各巻線部分のポール２１に対する位置決め精度が低下す
るという不具合を招く。また、この不具合を防止するに
は、界磁巻線をテープ等により固めればよいが、このよ
うな作業が非常に面倒なため作業効率の低下を招くこと
となる。これに対しては、ポール２１の両長手方向外壁
の各長手方向長さをそれぞれ短くして、ポールシュー２
２を変形してポール２１の基部からその全外周方向に向
け延出させるように鍛造成形することも考えられる。し
かしながら、このような鍛造成形を丸棒状界磁鉄芯材料
に対して行う場合、図５（Ａ）に示すように、鍛造成形
用下型４０及び上型５０を準備し、下型４０には、ポー
ル２１の外形形状に対応するように凹部４１を形成する
とともに、この凹部４１の開口端の周囲に前記変形ポー
ルシューの外周部の表面に対応するように円筒壁状成形
環面部４２を形成し、一方、上型５０には、前記変形ポ
ールシューの全表面に対応するように円筒壁状成形面５
１を形成しておく。そして、所定長さに切断した丸棒状
界磁鉄芯材料（以下、丸棒状界磁鉄芯材料３０という）
を、図５（Ａ）に示すように、下型４０と上型５０の間
に配置した後、図５（Ｂ）（Ｃ）により示すように、上
型５０によりその成形面５１にて界磁鉄芯材料３０を下
型４０の凹部４１内及び成形環面部４２上に押圧して塑
性変形させ界磁鉄芯２０Ａ（図５（Ｂ）（Ｃ）及び図７
（Ｂ）参照）として鍛造成形することとなる。By the way, when a field winding is wound around the pole 21 of the field iron core 20 constructed as described above, the pole 21 of the field winding extends along both outer walls in the longitudinal direction. Each winding portion is properly positioned on both longitudinal outer walls of the pole 21 by each extending portion of the pole shoe 22 from both longitudinal outer walls of the pole 21. However, the remaining winding portions of the field winding project outward from the extending portions of the pole shoe 22 along the longitudinal outer walls of the pole 21 and bend toward the axial center of the yoke of the stator. To do Therefore, the positioning accuracy of the remaining winding portions of the field winding with respect to the pole 21 deteriorates. Further, in order to prevent this problem, the field winding may be fixed with a tape or the like, but since such a work is very troublesome, the work efficiency is lowered. To this end, the lengths of the outer walls of the pole 21 in the longitudinal direction are shortened to reduce the pole shoe 2
It is also conceivable that the 2 is deformed and forged so as to extend from the base of the pole 21 toward the entire outer peripheral direction thereof. However, when such forging is performed on a round bar-shaped field iron core material, a lower die 40 and an upper die 50 for forging are prepared as shown in FIG. , A concave portion 41 is formed so as to correspond to the outer shape of the pole 21, and a cylindrical wall shaped annular surface portion 42 is formed around the open end of the concave portion 41 so as to correspond to the surface of the outer peripheral portion of the modified pole shoe. On the other hand, the upper die 50 has a cylindrical wall-shaped molding surface 5 corresponding to the entire surface of the modified pole shoe.
1 is formed. Then, a round bar-shaped field iron core material cut to a predetermined length (hereinafter referred to as a round bar-shaped field iron core material 30)
Is placed between the lower mold 40 and the upper mold 50 as shown in FIG. 5 (A), and then the upper mold 50 is used to form a boundary on the molding surface 51 as shown in FIG. 5 (B) (C). The magnetic iron core material 30 is pressed into the recess 41 of the lower mold 40 and the molding ring surface portion 42 to be plastically deformed, and the magnetic iron core 20A (FIGS. 5B, 5C and 7).
(See (B)).
【０００４】そこで、図５（Ａ）から図５（Ｃ）までの
鍛造成形工程を詳細に調べてみると、上型５０により界
磁鉄芯材料３０を下型４０上に押圧する場合、上型５０
の成形面５１による押圧力が、その押圧初期には界磁鉄
芯材料３０の上端ｐに直線状に集中し、その後、界磁鉄
芯材料３０の塑性変形を伴いつつ面状に変化して行く。
かかる場合、上述のような直線状の集中押圧力のため
に、界磁鉄芯材料３０においては、その上型５０の成形
面５１との直線状接触部近傍の塑性が先行して大きく変
形する。そして、この界磁鉄芯材料３０の上型５０の成
形面５１との直線状接触部近傍が、同界磁鉄芯材料３０
の塑性変形の進行に伴い、図６（Ａ）に示すように、突
出部２３として局部的に突出し、然る後、図６（Ｂ）に
示すように、巻込部２４を形成してしまう。そして、界
磁鉄芯材料３０の塑性変形がさらに進行するに伴い、巻
込部２４が、図５（Ｃ）及び図７（Ａ）（Ｂ）に示すご
とく、上述の突出部２３を介し上型５０の下面に向けて
貫通し、同突出部２３を、図７（Ｃ）に示すごとく、分
離部２３ａとして分離してしまう。Therefore, a detailed examination of the forging process shown in FIGS. 5A to 5C shows that when the upper die 50 presses the field iron core material 30 onto the lower die 40, Mold 50
The pressing force exerted by the molding surface 51 of No. 1 concentrates linearly on the upper end p of the field iron core material 30 in the initial stage of the pressing, and then changes to a plane shape with plastic deformation of the field iron core material 30. go.
In such a case, in the field iron core material 30, the plasticity in the vicinity of the linear contact portion with the forming surface 51 of the upper mold 50 is largely deformed first due to the linear concentrated pressing force as described above. .. The vicinity of the linear contact portion with the molding surface 51 of the upper mold 50 of the field iron core material 30 is the same as the field iron core material 30.
6A, the protrusion 23 locally projects as shown in FIG. 6A, and then, as shown in FIG. 6B, the winding portion 24 is formed. .. Then, as the plastic deformation of the field iron core material 30 further progresses, the rolled-in portion 24 moves upwards through the above-mentioned protruding portion 23 as shown in FIGS. 5 (C) and 7 (A) (B). Penetrating toward the lower surface of the mold 50, the protruding portion 23 is separated as a separating portion 23a as shown in FIG. 7C.
【０００５】その結果、同分離部２３ａが、界磁鉄芯２
０Ａの繰り返しの鍛造成形毎に、分離形成されると、こ
れら各分離部２３ａが、下型４０の凹部４１内や成形環
面部４２上に堆積して、次の鍛造成形品に欠肉不良等を
招く恐れがある。また、上述の巻込部２４は、界磁鉄芯
２０Ａのポールシューに形成されるので、同ポールシュ
ーの巻込部２４の形成部分にトリミングを施す必要が生
じる。そこで、本発明は、以上のようなことに対処すべ
く、上述したような現象の発生を未然に防止しつつ鍛造
成形するようにした鍛造成形品の鍛造成形方法を提供し
ようとするものである。As a result, the separating portion 23a is replaced by the field iron core 2.
When separated and formed for each repeated forging of 0A, these separating portions 23a are deposited in the recess 41 of the lower die 40 and on the molding ring surface portion 42, resulting in defective wall thickness in the next forged product. May lead to Further, since the winding portion 24 described above is formed on the pole shoe of the field iron core 20A, it is necessary to trim the portion where the winding portion 24 of the pole shoe is formed. Therefore, in order to deal with the above, the present invention is to provide a forging method of a forged product that is forged while preventing the occurrence of the above-mentioned phenomenon. ..
【０００６】[0006]
【課題を解決するための手段】上記課題の解決にあた
り、本発明の構成は、柱状部の外形形状に対応するよう
に形成した凹部、及び前記柱状部にその基部の全周より
も外方に延出するようにー体的に設けられるべき鍔部の
環状表面部に対応するように前記凹部の開口端周囲に環
状に形成した成形環面部を有する下型と、この下型の直
上に配設されて前記鍔部の全表面に対応するように形成
した成形面を有する上型との間にて、所定長さを有する
断面非円形形状の被鍛造金属素材を、その長手状略平面
部にて前記成形面を臨むように前記凹部及び成形環面部
上にて配置して、前記上型によりその成形面にて前記被
鍛造金属素材にその長手方向略平面部に面状に押圧力を
付与しつつ同被鍛造金属素材を前記凹部内及び前記成形
環面部上に押圧して塑性変形させ、前記柱状部及び前記
鍔部を前記凹部内及び前記成形環面部上にそれぞれ成形
し鍛造成形品とするようにしたことにある。In order to solve the above-mentioned problems, the structure of the present invention is such that a concave portion formed so as to correspond to the outer shape of a columnar portion and the columnar portion outwardly of the entire circumference of the base portion thereof. A lower mold having an annular molding surface portion formed around the opening end of the concave portion so as to correspond to the annular surface portion of the flange portion that is to be provided as a body, and is arranged directly above the lower mold. The forged metal material having a non-circular cross-section having a predetermined length is provided between the upper die having a molding surface formed so as to correspond to the entire surface of the flange portion, and the longitudinal substantially flat portion thereof. Is arranged on the concave portion and the molding annular surface portion so as to face the molding surface, and a pressing force is applied to the forging metal material by the molding die in a planar shape on the substantially flat surface portion in the longitudinal direction by the molding surface. While applying, press the same forged metal material in the recess and on the forming ring surface part. It is sex deformed is to the columnar portion and the flange portion is set as the molding forged product respectively in the recess and the molded ring surface on.
【０００７】[0007]
【作用】このように本発明を構成したことにより、前記
下型と前記上型との間において、前記断面非円形形状の
被鍛造金属素材を、その長手方向略平面部にて前記上型
の成形面を臨むように、前記下型の凹部及び成形環面部
上に配置して、前記上型によりその成形面にて前記被鍛
造金属素材にその略長手方向平面部に面状に押圧力を付
与しつつ同被鍛造金属素材を前記凹部内及び前記成形環
面部上に押圧して塑性変形させ、前記柱状部及び前記鍔
部を前記凹部内及び前記成形環面部上にそれぞれ成形し
鍛造成形品とする。By configuring the present invention in this manner, the forged metal material having a non-circular cross-section is provided between the lower die and the upper die at a substantially plane portion in the longitudinal direction of the upper die. It is arranged on the concave portion of the lower die and the forming annular surface portion so as to face the forming surface, and a pressing force is applied by the upper die to the metal surface to be forged at the forming surface in a plane shape in its substantially longitudinal plane portion. While forging, the metal material to be forged is pressed into the concave portion and the forming annular surface portion to be plastically deformed, and the columnar portion and the flange portion are formed in the concave portion and the forming annular surface portion, respectively, and a forged product is formed. And
【０００８】[0008]
【発明の効果】このように、前記鍛造成形品の鍛造成形
にあたっては、被鍛造成形金属素材として断面非円形形
状のものを採用して、前記上型によりその成形面にて前
記被鍛造成形品の長手方向略平面部に対し初期的に面状
に押圧力を付与しつつ同被鍛造成形品の塑性変形を進行
させるようにしたので、前記長手状略平面部やその近傍
部分に対し、従来技術の解決課題にて述べたような線状
の押圧力が加わることがなく、その結果、前記被鍛造成
形金属素材の長手状略平面部やその近傍部分以外の部分
に比べて同長手状略平面部やその近傍部分が先行して著
しく塑性変形してしまうというようなことがない。従っ
て、鍛造成形工程において、従来技術の解決課題にて述
べたような前記鍛造成形品の鍔部の局部的突出部、巻込
部や分離部が工程内不良として生ずることがない。ま
た、前記鍔部が前記柱状部の基部の全周から外方に延出
しているので、前記柱状部に線材を巻装しても、この線
材が前記鍔部により前記柱状部の周囲に確実に位置決め
されることとなる。従って、同線材を前記柱状部の周囲
に位置決めするためにテープ等により固めるというよう
な面倒な作業を省略し得る。As described above, in the forging of the forged product, the forged metal material having a non-circular cross section is adopted, and the forged product is formed on the forming surface by the upper die. Since the plastic deformation of the forging-molded product is made to progress while initially applying a pressing force to the substantially flat surface portion in the longitudinal direction, the conventional substantially flat surface portion and the vicinity thereof are The linear pressing force as described in the technical problem to be solved is not applied, and as a result, the longitudinal metal is substantially longer than that of the forged metal material except the longitudinal plane part and its vicinity. There is no possibility that the flat surface portion and its vicinity will be plastically deformed in advance. Therefore, in the forging-molding process, the local protrusion, the winding part, and the separating part of the collar of the forged-molded product as described in the problem of the prior art do not occur as in-process defects. Further, since the flange portion extends outward from the entire circumference of the base portion of the columnar portion, even if a wire rod is wound around the columnar portion, the wire rod can be securely attached to the periphery of the columnar portion by the collar portion. Will be positioned. Therefore, it is possible to omit the troublesome work of fixing the wire material around the columnar portion with a tape or the like.
【０００９】[0009]
【実施例】以下、本発明のー実施例を図面により説明す
ると、図１は、上述した車両用スタータモータに採用さ
れるステータのヨーク１０に本発明に係る界磁鉄芯６０
が適用された例を示しており、この界磁鉄芯６０は、冷
間鍛造用界磁鉄芯材料により冷間鍛造成形工程を経て一
体的に形成されている。この界磁鉄芯６０は、図１
（Ａ）（Ｂ）に示すごとく、柱状のポール６１を有して
おり、このポール６１は、その偏平状先端突部６１ａに
て、図１（Ａ）に示すごとく、ヨーク１０の内周壁の適
所に溶接される。また、界磁鉄芯６０は、ポール６１の
基部６１ｂに同軸的に形成した鍔状のポールシュー６２
を有しており、このポールシュー６２は、その外周部６
２ａにて、ポール６１の基部６１ｂの全外周面から外方
へ延出している。かかる場合、ポールシュー６２は、ヨ
ーク１０内に同心的に軸支されるロータの外周面に所定
の間隙を介しー様に対向すべく、図１（Ａ）に示すよう
に、図示上下方向中央から上下方向に向け図示右方へ円
筒状に湾曲して形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described with reference to the drawings. FIG. 1 shows a yoke 10 of a stator used in the above-described vehicle starter motor and a field iron core 60 according to the present invention.
The field iron core 60 is integrally formed from a field iron core material for cold forging through a cold forging forming step. This field iron core 60 is shown in FIG.
As shown in (A) and (B), it has a columnar pole 61, and this pole 61 has a flat-shaped tip projection 61a, as shown in FIG. 1 (A), on the inner peripheral wall of the yoke 10. Welded in place. Further, the field iron core 60 has a collar-shaped pole shoe 62 coaxially formed on the base portion 61 b of the pole 61.
This pole shoe 62 has an outer peripheral portion 6
2a, it extends outward from the entire outer peripheral surface of the base 61b of the pole 61. In such a case, the pole shoe 62 is arranged so as to face the outer peripheral surface of the rotor which is concentrically supported in the yoke 10 with a predetermined gap therebetween, as shown in FIG. Is curved in a cylindrical shape in the up-down direction and to the right in the drawing.
【００１０】次に、このように構成した界磁鉄芯６０の
本発明による冷間鍛造成形方法について説明する。ま
ず、被鍛造界磁鉄心材料としての丸棒材料を準備し、こ
の丸棒材料に対し断面略長方形状を有するように引抜加
工等を施して所定長さにて切断し、図２（Ａ）に示すよ
うな被鍛造界磁鉄心素材７０を形成する。但し、被鍛造
界磁鉄心素材７０の上面７１及び下面７２は、共に、同
一方向に幾分湾曲しており、上面７１の曲率半径は上型
５０の成形面５１の曲率半径よりも幾分小さくしてあ
り、一方、下面７２の曲率半径は下型４０の成形面４２
の曲率半径よりも幾分大きくしてある。ついで、被鍛造
界磁鉄心素材７０を、図２（Ｂ）（Ｃ）及び図３（Ａ）
にて示すように、上述した下型４０と上型５０との間に
配置する。かかる場合、被鍛造界磁鉄心素材７０の上面
７１が、上型５０の成形面５１の長手方向中央部に対向
し、また、この被鍛造界磁鉄心素材７０の下面７２が下
型４０の凹部４１及び成形環面部４２の長手方向中央部
に対向するようにする。然る後、上型５０によりその成
形面５１にて被鍛造界磁鉄心素材７０にその上面７１を
介し押圧力を付与しつつ同被鍛造界磁鉄心素材７０を下
型４０の凹部４１内及び成形環面部４２上に押圧して塑
性変形させ、ポール６１及びポールシュー６２を凹部４
１及び成形環面部４２上にそれぞれ冷間鍛造成形し界磁
鉄心６０とする。Next, the cold forging method according to the present invention for the field iron core 60 thus constructed will be described. First, a round bar material as a forged field core material is prepared, and the round bar material is subjected to a drawing process or the like so as to have a substantially rectangular cross section, and cut into a predetermined length. The forged field iron core material 70 as shown in FIG. However, both the upper surface 71 and the lower surface 72 of the forged field core material 70 are curved in the same direction, and the radius of curvature of the upper surface 71 is somewhat smaller than the radius of curvature of the molding surface 51 of the upper die 50. On the other hand, the radius of curvature of the lower surface 72 is equal to the molding surface 42 of the lower mold 40.
It is slightly larger than the radius of curvature of. Next, the forged field iron core material 70 is set in FIGS. 2 (B) (C) and 3 (A).
As shown by, it is arranged between the lower mold 40 and the upper mold 50 described above. In such a case, the upper surface 71 of the forged field core material 70 faces the central portion in the longitudinal direction of the molding surface 51 of the upper die 50, and the lower surface 72 of the forged field core material 70 is the recess of the lower die 40. 41 and the molding annular surface portion 42 so as to face the central portion in the longitudinal direction. After that, the upper die 50 applies a pressing force to the forging field core material 70 at the forming surface 51 through the upper surface 71 of the forging field core material 70, and the forging field core material 70 is placed in the recess 41 of the lower die 40 and The pole 61 and the pole shoe 62 are pressed onto the molding ring surface portion 42 to be plastically deformed, and the pole 61 and the pole shoe 62 are depressed.
1 and the molding annular surface portion 42 are cold forged to form a field core 60.
【００１１】しかして、この冷間鍛造成形工程におい
て、上型５０により被鍛造界磁鉄心素材７０を下型４０
上に押圧する場合、上述のような各曲率半径との関係
で、上型５０の成形面５１による押圧力が、その押圧初
期には被鍛造界磁鉄心素材７０の上面７１のほぼ全体に
作用する。その後、同押圧力の作用面が、被鍛造界磁鉄
心素材７０の塑性変形を伴いつつさらに拡大して行く。
換言すれば、被鍛造界磁鉄心素材７０の上面７１のほぼ
全体に作用する押圧力は、線状に集中する場合に比べ、
著しく緩和されて作用するとともにその作用面積を被鍛
造界磁鉄心素材７０の塑性変形の進行に伴い拡大して行
く。従って、被鍛造界磁鉄心素材７０の上面７１近傍の
部分が、残余の部分に比べて、先行して著しく塑性変形
することがなく、その結果、界磁鉄心６０のポールシュ
ー６２の外周部６２ａに局部的な突出部や巻込部を形成
したり或いは同ポールシュー６２の外周部６２ａからの
分離部を形成するというような不良を招くことなく、界
磁鉄心６０の鍛造成形品質を格段に向上させうる。In the cold forging step, however, the upper die 50 moves the forged field core material 70 into the lower die 40.
When pressing upward, the pressing force by the molding surface 51 of the upper die 50 acts on almost the entire upper surface 71 of the forged field core material 70 in the initial stage of pressing due to the relationship with each radius of curvature as described above. To do. After that, the working surface of the pressing force further expands with the plastic deformation of the forging field core material 70.
In other words, the pressing force that acts on almost the entire upper surface 71 of the forged field core material 70 is greater than that when it is concentrated linearly.
The field is remarkably relaxed and its operating area is expanded as the plastic deformation of the forged field core material 70 progresses. Therefore, the portion near the upper surface 71 of the forged field core material 70 is not plastically deformed significantly as compared with the remaining portion, and as a result, the outer peripheral portion 62a of the pole shoe 62 of the field core 60 is reduced. The forging quality of the field core 60 can be remarkably improved without causing a defect such as forming a local protruding portion or a winding portion or forming a separation portion from the outer peripheral portion 62a of the pole shoe 62. Can be improved.
【００１２】また、上述のように分離部を形成すること
がないので、界磁鉄心６０を繰り返し成形する過程にお
いて同分離部が下型４０の凹部４１内や成形環面部４２
上に順次堆積して行くというようなことはなく、その結
果、次の界磁鉄心の成形にあたり、欠肉不良等を招くこ
ともない。また、ポールシュー６２がポール６１の基部
の全周から外方へ延出しているので、ポール６１に界磁
巻線を巻装しても、この界磁巻線がポールシュー６２の
外周部によりポール６１の周囲に確実に位置決めされる
こととなる。Further, since the separating portion is not formed as described above, in the process of repeatedly forming the field iron core 60, the separating portion is formed in the recess 41 of the lower die 40 or the forming ring surface portion 42.
As a result, there is no case where the layers are sequentially deposited on the upper side, and as a result, in the subsequent molding of the field iron core, defects such as lack of wall thickness do not occur. Further, since the pole shoe 62 extends outward from the entire circumference of the base of the pole 61, even if a field winding is wound around the pole 61, this field winding is The pole 61 is reliably positioned around the pole 61.
【００１３】なお、前記実施例においては、界磁鉄心６
０の冷間鍛造成形にあたり本発明を適用した例について
説明したが、これに限らず、界磁鉄心６０の外形形状と
類似した外形形状を有する鍛造成形品の鍛造成形にあた
り本発明を適用して実施してもよい。かかる場合、界磁
鉄心６０のポールに相当する柱状部の形状を適宜変更し
て実施してもよく、また、界磁鉄心６０のポールシュー
に相当する鍔部は、前記実施例の場合とは逆方向の円筒
壁形状を有するように形成して実施してもよく、また、
平面状に形成して実施してもよい。また、前記実施例に
おいては、被鍛造界磁鉄心素材７０の断面を略長方形状
にした例について説明したが、これに限らず、被鍛造界
磁鉄心素材７０に代えて、非円形形状の断面を有する被
鍛造界磁鉄心素材を準備して、この被鍛造界磁鉄心素材
の長手方向略平面部に対し、上型５０の押圧力を付与す
るようにして実施してもよい。また、本発明の実施にあ
たっては、冷間鍛造方法に限ることなく、例えば熱間鍛
造方法に本発明を適用して実施してもよい。In the above embodiment, the field iron core 6 is used.
Although the example in which the present invention is applied to the cold forging of No. 0 has been described, the present invention is applied to the forging of a forged product having an outer shape similar to the outer shape of the field core 60. You may implement. In such a case, the shape of the columnar portion corresponding to the pole of the field iron core 60 may be changed as appropriate, and the collar portion corresponding to the pole shoe of the field iron core 60 is different from that of the above-described embodiment. It may be formed so that it has a cylindrical wall shape in the opposite direction, and
You may implement | achieve by forming it in a plane form. Moreover, in the said Example, although the example which made the cross section of the forged field iron core material 70 into substantially rectangular shape was demonstrated, it is not limited to this, It replaces with the forged field iron core material 70, and has a non-circular cross section. It is also possible to prepare the forged field core material having the above and apply the pressing force of the upper die 50 to the substantially flat portion in the longitudinal direction of the forged field core material. Further, in carrying out the present invention, the present invention may be applied to, for example, a hot forging method without being limited to the cold forging method.
【図１】本発明に係る鍛造成形方法が適用された界磁鉄
心のー実施例を示す側面図及び正面図である。FIG. 1 is a side view and a front view showing an embodiment of a field iron core to which a forging method according to the present invention is applied.
【図２】被鍛造界磁鉄心素材の冷間鍛造工程を示す縦断
面図である。FIG. 2 is a vertical cross-sectional view showing a cold forging process of a field core material to be forged.
【図３】被鍛造界磁鉄心素材の冷間鍛造工程を示す横断
面図及びその部分拡大図である。FIG. 3 is a cross-sectional view showing a cold forging process of a field core material to be forged and a partially enlarged view thereof.
【図４】従来の界磁鉄心の側面図及び正面図である。FIG. 4 is a side view and a front view of a conventional field core.
【図５】従来の界磁鉄心の鍛造成形工程を示す縦断面図
及び横断面図である。5A and 5B are a longitudinal sectional view and a transverse sectional view showing a conventional field iron core forging process.
【図６】同部分拡大横断面図である。FIG. 6 is an enlarged transverse sectional view of the same portion.
【図７】同部分拡大横断面図、従来の界磁鉄心の最終鍛
造工程における破断正面図及び分離部の正面図である。FIG. 7 is an enlarged cross-sectional view of the same portion, a fracture front view in a final forging step of a conventional field iron core, and a front view of a separating portion.
４０…下型、４１…凹部、４２…成形間面部、５０…上
型、５１…成形面、６０…界磁鉄心、６１…ポール、６
２…ポールシュー、６２ａ…外周縁部、７０…被鍛造界
磁鉄心素材、７１…上面、７２…下面。40 ... Lower mold, 41 ... Recessed portion, 42 ... Molding surface portion, 50 ... Upper mold, 51 ... Molding surface, 60 ... Field core, 61 ... Pole, 6
2 ... Pole shoe, 62a ... Outer peripheral edge portion, 70 ... Forged field core material, 71 ... Top surface, 72 ... Bottom surface.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年９月８日[Submission date] September 8, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Name of item to be corrected] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 鍛造成形品の鍛造成形方法Title of invention Forging method of forged product
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、車両用スタータモータ
の界磁鉄芯その他これに類似した外形形状を有する鍛造
成形品を鍛造成形するに適した鍛造成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging method suitable for forging a field iron core of a vehicle starter motor and other forged products having an outer shape similar to this.
【０００２】[0002]
【従来技術】従来、例えば、車両に採用されるスタータ
モータにおいて、ステータのヨーク１０の内周壁に溶接
すべき界磁鉄芯２０は、通常、図４（Ａ）（Ｂ）に示す
ごとく、偏平直方体形状のポール２１と、このポール２
１に設けた鍔状のポールシュー２２とを有するように丸
棒状界磁鉄芯材料から鍛造成形されており、ポールシュ
ー２２は、ポール２１の基部からその長手方向に直交す
るように両側に向け円筒壁状に延出している。2. Description of the Related Art Conventionally, for example, in a starter motor used in a vehicle, a field iron core 20 to be welded to an inner peripheral wall of a yoke 10 of a stator is generally flat as shown in FIGS. 4 (A) and 4 (B). A rectangular parallelepiped pole 21 and this pole 2
1 is formed by forging from a round bar-shaped field iron core material so as to have a brim-shaped pole shoe 22. The pole shoe 22 faces both sides from the base of the pole 21 so as to be orthogonal to its longitudinal direction. It extends like a cylindrical wall.
【０００３】[0003]
【発明が解決しようとする課題】ところで、このように
構成した界磁鉄芯２０のポール２１に界磁巻線を巻装し
た場合、この界磁巻線のポール２１の両長手方向外壁に
沿う各巻線部分は、ポールシュー２２のポール２１の両
長手方向外壁からの各延出部分によってポール２１の両
長手方向外壁上に適確に位置決めされる。しかしなが
ら、前記界磁巻線の残余の各巻線部分は、ポールシュー
２２の各延出部分からポール２１の各長手方向外壁に沿
い外方へ突出してしまい、ステータのヨークの軸芯側に
向け屈曲したりする。従って、上述の界磁巻線の残余の
各巻線部分のポール２１に対する位置決め精度が低下す
るという不具合を招く。また、この不具合を防止するに
は、界磁巻線をテープ等により固めればよいが、このよ
うな作業が非常に面倒なため作業効率の低下を招くこと
となる。これに対しては、ポール２１の両長手方向外壁
の各長手方向長さをそれぞれ短くして、ポールシュー２
２を変形してポール２１の基部からその全外周方向に向
け延出させるように鍛造成形することも考えられる。し
かしながら、このような鍛造成形を丸棒状界磁鉄芯材料
に対して行う場合、図５（Ａ）に示すように、鍛造成形
用下型４０及び上型５０を準備し、下型４０には、ポー
ル２１の外形形状に対応するように凹部４１を形成する
とともに、この凹部４１の開口端の周囲に前記変形ポー
ルシューの外周部の表面に対応するように円筒壁状成形
環面部４２を形成し、一方、上型５０には、前記変形ポ
ールシューの全表面に対応するように円筒壁状成形面５
１を形成しておく。そして、所定長さに切断した丸棒状
界磁鉄芯材料（以下、丸棒状界磁鉄芯材料３０という）
を、図５（Ａ）に示すように、下型４０と上型５０の間
に配置した後、図５（Ｂ）（Ｃ）により示すように、上
型５０によりその成形面５１にて界磁鉄芯材料３０を下
型４０の凹部４１内及び成形環面部４２上に押圧して塑
性変形させ界磁鉄芯２０Ａ（図５（Ｂ）（Ｃ）及び図７
（Ｂ）参照）として鍛造成形することとなる。By the way, when a field winding is wound around the pole 21 of the field iron core 20 constructed as described above, the pole 21 of the field winding extends along both outer walls in the longitudinal direction. Each winding portion is properly positioned on both longitudinal outer walls of the pole 21 by each extending portion of the pole shoe 22 from both longitudinal outer walls of the pole 21. However, the remaining winding portions of the field winding project outward from the extending portions of the pole shoe 22 along the longitudinal outer walls of the pole 21 and bend toward the axial center of the yoke of the stator. To do Therefore, the positioning accuracy of the remaining winding portions of the field winding with respect to the pole 21 deteriorates. Further, in order to prevent this problem, the field winding may be fixed with a tape or the like, but since such a work is very troublesome, the work efficiency is lowered. To this end, the lengths of the outer walls of the pole 21 in the longitudinal direction are shortened to reduce the pole shoe 2
It is also conceivable that the 2 is deformed and forged so as to extend from the base of the pole 21 toward the entire outer peripheral direction thereof. However, when such forging is performed on a round bar-shaped field iron core material, a lower die 40 and an upper die 50 for forging are prepared as shown in FIG. , A concave portion 41 is formed so as to correspond to the outer shape of the pole 21, and a cylindrical wall shaped annular surface portion 42 is formed around the open end of the concave portion 41 so as to correspond to the surface of the outer peripheral portion of the modified pole shoe. On the other hand, the upper die 50 has a cylindrical wall-shaped molding surface 5 corresponding to the entire surface of the modified pole shoe.
1 is formed. Then, a round bar-shaped field iron core material cut to a predetermined length (hereinafter referred to as a round bar-shaped field iron core material 30)
Is placed between the lower mold 40 and the upper mold 50 as shown in FIG. 5 (A), and then the upper mold 50 is used to form a boundary on the molding surface 51 as shown in FIG. 5 (B) (C). The magnetic iron core material 30 is pressed into the recess 41 of the lower mold 40 and the molding ring surface portion 42 to be plastically deformed, and the magnetic iron core 20A (FIGS. 5B, 5C and 7).
(See (B)).
【０００４】そこで、図５（Ａ）から図５（Ｃ）までの
鍛造成形工程を詳細に調べてみると、上型５０により界
磁鉄芯材料３０を下型４０上に押圧する場合、上型５０
の成形面５１による押圧力が、その押圧初期には界磁鉄
芯材料３０の上端ｐに直線状に集中し、その後、界磁鉄
芯材料３０の塑性変形を伴いつつ面状に変化して行く。
かかる場合、上述のような直線状の集中押圧力のため
に、界磁鉄芯材料３０においては、その上型５０の成形
面５１との直線状接触部近傍の塑性が先行して大きく変
形する。そして、この界磁鉄芯材料３０の上型５０の成
形面５１との直線状接触部近傍が、同界磁鉄芯材料３０
の塑性変形の進行に伴い、図６（Ａ）に示すように、突
出部２３として局部的に突出し、然る後、図６（Ｂ）に
示すように、巻込部２４を形成してしまう。そして、界
磁鉄芯材料３０の塑性変形がさらに進行するに伴い、巻
込部２４が、図５（Ｃ）及び図７（Ａ）（Ｂ）に示すご
とく、上述の突出部２３を介し上型５０の下面に向けて
貫通し、同突出部２３を、図７（Ｃ）に示すごとく、分
離部２３ａとして分離してしまう。Therefore, a detailed examination of the forging process shown in FIGS. 5A to 5C shows that when the upper die 50 presses the field iron core material 30 onto the lower die 40, Mold 50
The pressing force exerted by the molding surface 51 of No. 1 concentrates linearly on the upper end p of the field iron core material 30 in the initial stage of the pressing, and then changes to a plane shape with plastic deformation of the field iron core material 30. go.
In such a case, in the field iron core material 30, the plasticity in the vicinity of the linear contact portion with the forming surface 51 of the upper mold 50 is largely deformed first due to the linear concentrated pressing force as described above. .. The vicinity of the linear contact portion with the molding surface 51 of the upper mold 50 of the field iron core material 30 is the same as the field iron core material 30.
6A, the protrusion 23 locally projects as shown in FIG. 6A, and then, as shown in FIG. 6B, the winding portion 24 is formed. .. Then, as the plastic deformation of the field iron core material 30 further progresses, the rolled-in portion 24 moves upwards through the above-mentioned protruding portion 23 as shown in FIGS. 5 (C) and 7 (A) (B). Penetrating toward the lower surface of the mold 50, the protruding portion 23 is separated as a separating portion 23a as shown in FIG. 7C.
【０００５】その結果、同分離部２３ａが、界磁鉄芯２
０Ａの繰り返しの鍛造成形毎に、分離形成されると、こ
れら各分離部２３ａが、下型４０の凹部４１内や成形環
面部４２上に堆積して、次の鍛造成形品に欠肉不良等を
招く恐れがある。また、上述の巻込部２４は、界磁鉄芯
２０Ａのポールシューに形成されるので、同ポールシュ
ーの巻込部２４の形成部分にトリミングを施す必要が生
じる。そこで、本発明は、以上のようなことに対処すべ
く、上述したような現象の発生を未然に防止しつつ鍛造
成形するようにした鍛造成形品の鍛造成形方法を提供し
ようとするものである。As a result, the separating portion 23a is replaced by the field iron core 2.
When separated and formed for each repeated forging of 0A, these separating portions 23a are deposited in the recess 41 of the lower die 40 and on the molding ring surface portion 42, resulting in defective wall thickness in the next forged product. May lead to Further, since the winding portion 24 described above is formed on the pole shoe of the field iron core 20A, it is necessary to trim the portion where the winding portion 24 of the pole shoe is formed. Therefore, in order to deal with the above, the present invention is to provide a forging method of a forged product that is forged while preventing the occurrence of the above-mentioned phenomenon. ..
【０００６】[0006]
【課題を解決するための手段】上記課題の解決にあた
り、本発明の構成は、柱状部の外形形状に対応するよう
に形成した凹部、及び前記柱状部にその基部の全周より
も外方に延出するようにー体的に設けられるべき鍔部の
環状表面部に対応するように前記凹部の開口端周囲に環
状に形成した成形環面部を有する下型と、この下型の直
上に配設されて前記鍔部の全表面に対応するように形成
した成形面を有する上型との間にて、所定長さを有する
断面非円形形状の被鍛造金属素材を、その長手状略平面
部にて前記成形面を臨むように前記凹部及び成形環面部
上にて配置して、前記上型によりその成形面にて前記被
鍛造金属素材にその長手方向略平面部に面状に押圧力を
付与しつつ同被鍛造金属素材を前記凹部内及び前記成形
環面部上に押圧して塑性変形させ、前記柱状部及び前記
鍔部を前記凹部内及び前記成形環面部上にそれぞれ成形
し鍛造成形品とするようにしたことにある。In order to solve the above-mentioned problems, the structure of the present invention is such that a concave portion formed so as to correspond to the outer shape of a columnar portion and the columnar portion outwardly of the entire circumference of the base portion thereof. A lower mold having an annular molding surface portion formed around the opening end of the concave portion so as to correspond to the annular surface portion of the flange portion that is to be provided as a body, and is arranged directly above the lower mold. The forged metal material having a non-circular cross-section having a predetermined length is provided between the upper die having a molding surface formed so as to correspond to the entire surface of the flange portion, and the longitudinal substantially flat portion thereof. Is arranged on the concave portion and the molding annular surface portion so as to face the molding surface, and a pressing force is applied to the forging metal material by the molding die in a planar shape on the substantially flat surface portion in the longitudinal direction by the molding surface. While applying, press the same forged metal material in the recess and on the forming ring surface part. It is sex deformed is to the columnar portion and the flange portion is set as the molding forged product respectively in the recess and the molded ring surface on.
【０００７】[0007]
【作用】このように本発明を構成したことにより、前記
下型と前記上型との間において、前記断面非円形形状の
被鍛造金属素材を、その長手方向略平面部にて前記上型
の成形面を臨むように、前記下型の凹部及び成形環面部
上に配置して、前記上型によりその成形面にて前記被鍛
造金属素材にその略長手方向平面部に面状に押圧力を付
与しつつ同被鍛造金属素材を前記凹部内及び前記成形環
面部上に押圧して塑性変形させ、前記柱状部及び前記鍔
部を前記凹部内及び前記成形環面部上にそれぞれ成形し
鍛造成形品とする。By configuring the present invention in this manner, the forged metal material having a non-circular cross-section is provided between the lower die and the upper die at a substantially plane portion in the longitudinal direction of the upper die. It is arranged on the concave portion of the lower die and the forming annular surface portion so as to face the forming surface, and a pressing force is applied by the upper die to the metal surface to be forged at the forming surface in a plane shape in its substantially longitudinal plane portion. While forging, the metal material to be forged is pressed into the concave portion and the forming annular surface portion to be plastically deformed, and the columnar portion and the flange portion are formed in the concave portion and the forming annular surface portion, respectively, and a forged product is formed. And
【０００８】[0008]
【発明の効果】このように、前記鍛造成形品の鍛造成形
にあたっては、被鍛造成形金属素材として断面非円形形
状のものを採用して、前記上型によりその成形面にて前
記被鍛造成形品の長手方向略平面部に対し初期的に面状
に押圧力を付与しつつ同被鍛造成形品の塑性変形を進行
させるようにしたので、前記長手状略平面部やその近傍
部分に対し、従来技術の解決課題にて述べたような線状
の押圧力が加わることがなく、その結果、前記被鍛造成
形金属素材の長手状略平面部やその近傍部分以外の部分
に比べて同長手状略平面部やその近傍部分が先行して著
しく塑性変形してしまうというようなことがない。従っ
て、鍛造成形工程において、従来技術の解決課題にて述
べたような前記鍛造成形品の鍔部の局部的突出部、巻込
部や分離部が工程内不良として生ずることがない。ま
た、前記鍔部が前記柱状部の基部の全周から外方に延出
しているので、前記柱状部に線材を巻装しても、この線
材が前記鍔部により前記柱状部の周囲に確実に位置決め
されることとなる。従って、同線材を前記柱状部の周囲
に位置決めするためにテープ等により固めるというよう
な面倒な作業を省略し得る。As described above, in the forging of the forged product, the forged metal material having a non-circular cross section is adopted, and the forged product is formed on the forming surface by the upper die. Since the plastic deformation of the forging-molded product is made to progress while initially applying a pressing force to the substantially flat surface portion in the longitudinal direction, the conventional substantially flat surface portion and the vicinity thereof are The linear pressing force as described in the technical problem to be solved is not applied, and as a result, the longitudinal metal is substantially longer than that of the forged metal material except the longitudinal plane part and its vicinity. There is no possibility that the flat surface portion and its vicinity will be plastically deformed in advance. Therefore, in the forging-molding process, the local protrusion, the winding part, and the separating part of the collar of the forged-molded product as described in the problem of the prior art do not occur as in-process defects. Further, since the flange portion extends outward from the entire circumference of the base portion of the columnar portion, even if a wire rod is wound around the columnar portion, the wire rod can be securely attached to the periphery of the columnar portion by the collar portion. Will be positioned. Therefore, it is possible to omit the troublesome work of fixing the wire material around the columnar portion with a tape or the like.
【０００９】[0009]
【実施例】以下、本発明のー実施例を図面により説明す
ると、図１は、上述した車両用スタータモータに採用さ
れるステータのヨーク１０に本発明に係る界磁鉄芯６０
が適用された例を示しており、この界磁鉄芯６０は、冷
間鍛造用界磁鉄芯材料により冷間鍛造成形工程を経て一
体的に形成されている。この界磁鉄芯６０は、図１
（Ａ）（Ｂ）に示すごとく、柱状のポール６１を有して
おり、このポール６１は、その偏平状先端突部６１ａに
て、図１（Ａ）に示すごとく、ヨーク１０の内周壁の適
所に溶接される。また、界磁鉄芯６０は、ポール６１の
基部６１ｂに同軸的に形成した鍔状のポールシュー６２
を有しており、このポールシュー６２は、その外周部６
２ａにて、ポール６１の基部６１ｂの全外周面から外方
へ延出している。かかる場合、ポールシュー６２は、ヨ
ーク１０内に同心的に軸支されるロータの外周面に所定
の間隙を介しー様に対向すべく、図１（Ａ）に示すよう
に、図示上下方向中央から上下方向に向け図示右方へ円
筒状に湾曲して形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described with reference to the drawings. FIG. 1 shows a yoke 10 of a stator used in the above-described vehicle starter motor and a field iron core 60 according to the present invention.
The field iron core 60 is integrally formed from a field iron core material for cold forging through a cold forging forming step. This field iron core 60 is shown in FIG.
As shown in (A) and (B), it has a columnar pole 61, and this pole 61 has a flat-shaped tip projection 61a, as shown in FIG. 1 (A), on the inner peripheral wall of the yoke 10. Welded in place. Further, the field iron core 60 has a collar-shaped pole shoe 62 coaxially formed on the base portion 61 b of the pole 61.
This pole shoe 62 has an outer peripheral portion 6
2a, it extends outward from the entire outer peripheral surface of the base 61b of the pole 61. In such a case, the pole shoe 62 is arranged so as to face the outer peripheral surface of the rotor which is concentrically supported in the yoke 10 with a predetermined gap therebetween, as shown in FIG. Is curved in a cylindrical shape in the up-down direction and to the right in the drawing.
【００１０】次に、このように構成した界磁鉄芯６０の
本発明による冷間鍛造成形方法について説明する。ま
ず、被鍛造界磁鉄心材料としての丸棒材料を準備し、こ
の丸棒材料に対し断面略長方形状を有するように引抜加
工等を施して所定長さにて切断し、図２（Ａ）に示すよ
うな被鍛造界磁鉄心素材７０を形成する。但し、被鍛造
界磁鉄心素材７０の上面７１及び下面７２は、共に、同
一方向に幾分湾曲しており、上面７１の曲率半径は上型
５０の成形面５１の曲率半径よりも幾分小さくしてあ
り、一方、下面７２の曲率半径は下型４０の成形面４２
の曲率半径よりも幾分大きくしてある。ついで、被鍛造
界磁鉄心素材７０を、図２（Ｂ）（Ｃ）及び図３（Ａ）
にて示すように、上述した下型４０と上型５０との間に
配置する。かかる場合、被鍛造界磁鉄心素材７０の上面
７１が、上型５０の成形面５１の長手方向中央部に対向
し、また、この被鍛造界磁鉄心素材７０の下面７２が下
型４０の凹部４１及び成形環面部４２の長手方向中央部
に対向するようにする。然る後、上型５０によりその成
形面５１にて被鍛造界磁鉄心素材７０にその上面７１を
介し押圧力を付与しつつ同被鍛造界磁鉄心素材７０を下
型４０の凹部４１内及び成形環面部４２上に押圧して塑
性変形させ、ポール６１及びポールシュー６２を凹部４
１及び成形環面部４２上にそれぞれ冷間鍛造成形し界磁
鉄心６０とする。Next, the cold forging method according to the present invention for the field iron core 60 thus constructed will be described. First, a round bar material as a forged field core material is prepared, and the round bar material is subjected to a drawing process or the like so as to have a substantially rectangular cross section, and cut into a predetermined length. The forged field iron core material 70 as shown in FIG. However, both the upper surface 71 and the lower surface 72 of the forging field core material 70 are curved in the same direction, and the radius of curvature of the upper surface 71 is somewhat smaller than the radius of curvature of the molding surface 51 of the upper die 50. On the other hand, the radius of curvature of the lower surface 72 is equal to the molding surface 42 of the lower mold 40.
It is slightly larger than the radius of curvature of. Next, the forged field iron core material 70 is set in FIGS. 2 (B) (C) and 3 (A).
As shown by, it is arranged between the lower mold 40 and the upper mold 50 described above. In such a case, the upper surface 71 of the forged field core material 70 faces the central portion in the longitudinal direction of the molding surface 51 of the upper die 50, and the lower surface 72 of the forged field core material 70 is the recess of the lower die 40. 41 and the molding annular surface portion 42 so as to face the central portion in the longitudinal direction. After that, the upper die 50 applies a pressing force to the forging field core material 70 at the forming surface 51 through the upper surface 71 of the forging field core material 70, and the forging field core material 70 is placed in the recess 41 of the lower die 40 and The pole 61 and the pole shoe 62 are pressed onto the molding ring surface portion 42 to be plastically deformed, and the pole 61 and the pole shoe 62 are recessed 4
1 and the forming annular surface portion 42 are cold forged to form a field iron core 60.
【００１１】しかして、この冷間鍛造成形工程におい
て、上型５０により被鍛造界磁鉄心素材７０を下型４０
上に押圧する場合、上述のような各曲率半径との関係
で、上型５０の成形面５１による押圧力が、その押圧初
期には被鍛造界磁鉄心素材７０の上面７１のほぼ全体に
作用する。その後、同押圧力の作用面が、被鍛造界磁鉄
心素材７０の塑性変形を伴いつつさらに拡大して行く。
換言すれば、被鍛造界磁鉄心素材７０の上面７１のほぼ
全体に作用する押圧力は、線状に集中する場合に比べ、
著しく緩和されて作用するとともにその作用面積を被鍛
造界磁鉄心素材７０の塑性変形の進行に伴い拡大して行
く。従って、被鍛造界磁鉄心素材７０の上面７１近傍の
部分が、残余の部分に比べて、先行して著しく塑性変形
することがなく、その結果、界磁鉄心６０のポールシュ
ー６２の外周部６２ａに局部的な突出部や巻込部を形成
したり或いは同ポールシュー６２の外周部６２ａからの
分離部を形成するというような不良を招くことなく、界
磁鉄心６０の鍛造成形品質を格段に向上させうる。In the cold forging step, however, the upper die 50 moves the forged field core material 70 into the lower die 40.
When pressing upward, the pressing force by the molding surface 51 of the upper die 50 acts on almost the entire upper surface 71 of the forged field core material 70 in the initial stage of pressing due to the relationship with each radius of curvature as described above. To do. After that, the working surface of the pressing force further expands with the plastic deformation of the forging field core material 70.
In other words, the pressing force that acts on almost the entire upper surface 71 of the forged field core material 70 is greater than that when it is concentrated linearly.
The field is remarkably relaxed and its operating area is expanded as the plastic deformation of the forged field core material 70 progresses. Therefore, the portion near the upper surface 71 of the forged field core material 70 is not plastically deformed significantly as compared with the remaining portion, and as a result, the outer peripheral portion 62a of the pole shoe 62 of the field core 60 is reduced. The forging quality of the field core 60 can be remarkably improved without causing a defect such as forming a local protruding portion or a winding portion or forming a separation portion from the outer peripheral portion 62a of the pole shoe 62. Can be improved.
【００１２】また、上述のように分離部を形成すること
がないので、界磁鉄心６０を繰り返し成形する過程にお
いて同分離部が下型４０の凹部４１内や成形環面部４２
上に順次堆積して行くというようなことはなく、その結
果、次の界磁鉄心の成形にあたり、欠肉不良等を招くこ
ともない。また、ポールシュー６２がポール６１の基部
の全周から外方へ延出しているので、ポール６１に界磁
巻線を巻装しても、この界磁巻線がポールシュー６２の
外周部によりポール６１の周囲に確実に位置決めされる
こととなる。Further, since the separating portion is not formed as described above, in the process of repeatedly forming the field iron core 60, the separating portion is formed in the recess 41 of the lower die 40 or the forming ring surface portion 42.
As a result, there is no case where the layers are sequentially deposited on the upper side, and as a result, in the subsequent molding of the field iron core, defects such as lack of wall thickness do not occur. Further, since the pole shoe 62 extends outward from the entire circumference of the base of the pole 61, even if a field winding is wound around the pole 61, this field winding is The pole 61 is reliably positioned around the pole 61.
【００１３】なお、前記実施例においては、界磁鉄心６
０の冷間鍛造成形にあたり本発明を適用した例について
説明したが、これに限らず、界磁鉄心６０の外形形状と
類似した外形形状を有する鍛造成形品の鍛造成形にあた
り本発明を適用して実施してもよい。かかる場合、界磁
鉄心６０のポールに相当する柱状部の形状を適宜変更し
て実施してもよく、また、界磁鉄心６０のポールシュー
に相当する鍔部は、前記実施例の場合とは逆方向の円筒
壁形状を有するように形成して実施してもよく、また、
平面状に形成して実施してもよい。また、前記実施例に
おいては、被鍛造界磁鉄心素材７０の断面を略長方形状
にした例について説明したが、これに限らず、被鍛造界
磁鉄心素材７０に代えて、非円形形状の断面を有する被
鍛造界磁鉄心素材を準備して、この被鍛造界磁鉄心素材
の長手方向略平面部に対し、上型５０の押圧力を付与す
るようにして実施してもよい。また、本発明の実施にあ
たっては、冷間鍛造方法に限ることなく、例えば熱間鍛
造方法に本発明を適用して実施してもよい。In the above embodiment, the field iron core 6 is used.
Although the example in which the present invention is applied to the cold forging of No. 0 has been described, the present invention is applied to the forging of a forged product having an outer shape similar to the outer shape of the field core 60. You may implement. In such a case, the shape of the columnar portion corresponding to the pole of the field iron core 60 may be changed as appropriate, and the collar portion corresponding to the pole shoe of the field iron core 60 is different from that of the above-described embodiment. It may be formed so that it has a cylindrical wall shape in the opposite direction, and
You may implement | achieve by forming it in a plane form. Moreover, in the said Example, although the example which made the cross section of the forged field iron core material 70 into substantially rectangular shape was demonstrated, it is not limited to this, It replaces with the forged field iron core material 70, and has a non-circular cross section. It is also possible to prepare the forged field core material having the above and apply the pressing force of the upper die 50 to the substantially flat portion in the longitudinal direction of the forged field core material. Further, in carrying out the present invention, the present invention may be applied to, for example, a hot forging method without being limited to the cold forging method.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明に係る鍛造成形方法が適用された界磁鉄
心のー実施例を示す側面図及び正面図である。FIG. 1 is a side view and a front view showing an embodiment of a field iron core to which a forging method according to the present invention is applied.
【図２】被鍛造界磁鉄心素材の冷間鍛造工程を示す縦断
面図である。FIG. 2 is a vertical cross-sectional view showing a cold forging process of a field core material to be forged.
【図３】被鍛造界磁鉄心素材の冷間鍛造工程を示す横断
面図及びその部分拡大図である。FIG. 3 is a cross-sectional view showing a cold forging process of a field core material to be forged and a partially enlarged view thereof.
【図４】従来の界磁鉄心の側面図及び正面図である。FIG. 4 is a side view and a front view of a conventional field core.
【図５】従来の界磁鉄心の鍛造成形工程を示す縦断面図
及び横断面図である。5A and 5B are a longitudinal sectional view and a transverse sectional view showing a conventional field iron core forging process.
【図６】同部分拡大横断面図である。FIG. 6 is an enlarged transverse sectional view of the same portion.
【図７】同部分拡大横断面図、従来の界磁鉄心の最終鍛
造工程における破断正面図及び分離部の正面図である。FIG. 7 is an enlarged cross-sectional view of the same portion, a fracture front view in a final forging step of a conventional field iron core, and a front view of a separating portion.
【符号の説明】 ４０…下型、４１…凹部、４２…成形間面部、５０…上
型、５１…成形面、６０…界磁鉄心、６１…ポール、６
２…ポールシュー、６２ａ…外周縁部、７０…被鍛造界
磁鉄心素材、７１…上面、７２…下面。[Explanation of Codes] 40 ... Lower mold, 41 ... Recess, 42 ... Molding surface portion, 50 ... Upper mold, 51 ... Molding surface, 60 ... Field core, 61 ... Pole, 6
2 ... Pole shoe, 62a ... Outer peripheral edge portion, 70 ... Forged field core material, 71 ... Top surface, 72 ... Bottom surface.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森田 正弘 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Morita 1-1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd.
Claims (1)
した凹部、及び前記柱状部にその基部の全周よりも外方
に延出するようにー体的に設けられるべき鍔部の環状表
面部に対応するように前記凹部の開口端周囲に環状に形
成した成形環面部を有する下型と、この下型の直上に配
設されて前記鍔部の全表面に対応するように形成した成
形面を有する上型との間にて、所定長さを有する断面非
円形形状の被鍛造金属素材を、その長手状略平面部にて
前記成形面を臨むように前記凹部及び成形環面部上にて
配置して、前記上型によりその成形面にて前記被鍛造金
属素材にその長手方向略平面部に面状に押圧力を付与し
つつ同被鍛造金属素材を前記凹部内及び前記成形環面部
上に押圧して塑性変形させ、前記柱状部及び前記鍔部を
前記凹部内及び前記成形環面部上にそれぞれ成形し鍛造
成形品とするようにした鍛造成形品の鍛造成形方法。Claim: What is claimed is: 1. A recess formed to correspond to the outer shape of a columnar section, and a body provided so as to extend outward from the entire circumference of the base section of the columnar section. A lower die having a ring-shaped molding annular surface portion formed around the opening end of the recess so as to correspond to the annular surface portion of the collar portion to be formed, and arranged on the entire surface of the collar portion disposed directly above the lower die. Between the upper die having a correspondingly formed forming surface, a metal material to be forged having a non-circular cross-section having a predetermined length, the longitudinal substantially flat portion facing the forming surface The forging metal material is arranged on the concave portion and the molding annular surface portion, and the metallic material to be forged is applied to the forging metal material at its molding surface by the upper die while applying a planar pressing force to the substantially flat surface portion in the longitudinal direction. The columnar portion and the collar portion are pressed and plastically deformed in the recess and on the molding ring surface portion. Forging method forged product which is adapted to forged product molded respectively in the recess and the molded ring surface on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8787691A JPH0530711A (en) | 1991-03-26 | 1991-03-26 | Forging and molding method for forged and molded item |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8787691A JPH0530711A (en) | 1991-03-26 | 1991-03-26 | Forging and molding method for forged and molded item |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0530711A true JPH0530711A (en) | 1993-02-05 |
Family
ID=13927070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8787691A Pending JPH0530711A (en) | 1991-03-26 | 1991-03-26 | Forging and molding method for forged and molded item |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0530711A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4529329A (en) * | 1982-06-16 | 1985-07-16 | Shachihata Industry Co., Ltd. | Ballpoint pen with metallic rod ball seat |
-
1991
- 1991-03-26 JP JP8787691A patent/JPH0530711A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4529329A (en) * | 1982-06-16 | 1985-07-16 | Shachihata Industry Co., Ltd. | Ballpoint pen with metallic rod ball seat |
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