JPH1157914A - Manufacture of drum with boss - Google Patents
Manufacture of drum with bossInfo
- Publication number
- JPH1157914A JPH1157914A JP9231490A JP23149097A JPH1157914A JP H1157914 A JPH1157914 A JP H1157914A JP 9231490 A JP9231490 A JP 9231490A JP 23149097 A JP23149097 A JP 23149097A JP H1157914 A JPH1157914 A JP H1157914A
- Authority
- JP
- Japan
- Prior art keywords
- small
- boss
- diameter cylindrical
- thickness
- drum
- 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
Links
Landscapes
- Forging (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はボス付きドラムの製
造方法に関する。The present invention relates to a method for manufacturing a bossed drum.
【０００２】[0002]
【従来の技術】自動車の変速機に使用するドラム付きク
ラッチギヤは、ドラムとクラッチギヤとを一体に結合し
たものであり、この結合方法については、例えば特開昭
６２−１３８２６号公報「ドラム付きクラッチギア」に
提案されている。この技術は、同公報の第１図に示され
る通り、ドラム部及びギヤ部を個別に加工した後、それ
ぞれの部材を加締めや溶接で結合するものである。2. Description of the Related Art A clutch gear with a drum used for a transmission of an automobile is a clutch gear in which a drum and a clutch gear are integrally connected. Clutch gear ". According to this technique, as shown in FIG. 1 of the publication, after individually processing a drum portion and a gear portion, the respective members are joined by caulking or welding.
【０００３】しかし、ドラム部とギヤ部とを加締めや溶
接で結合すると、ドラム部に対するギヤ部の同軸精度
（以下「同軸度」と記す）度を出すことが難しく、ま
た、溶接で結合すると溶接熱による歪がギヤ部に発生す
る虞れがある。このため、ドラム付きクラッチギヤの品
質を均一に保つことが難しい。また、ドラム部とギヤ部
とを個別に加工した後、それぞれを結合するので、製造
に手間がかかりドラム付きクラッチギヤのコストを下げ
ることが難しい。However, if the drum portion and the gear portion are joined by caulking or welding, it is difficult to obtain the degree of coaxial accuracy (hereinafter referred to as "coaxiality") of the gear portion with respect to the drum portion. There is a possibility that distortion due to welding heat may occur in the gear portion. For this reason, it is difficult to keep the quality of the clutch gear with the drum uniform. In addition, since the drum portion and the gear portion are individually processed and then combined, it takes time and effort to manufacture, and it is difficult to reduce the cost of the clutch gear with the drum.
【０００４】一方、自動二輪車のリヤブレーキに使用す
るボス付きドラムは、ボスをリヤアクスルに取り付けて
ドラムの内側にブレーキシューを設けたものであって、
ブレーキシューでドラムの内周を押圧することにより後
輪の回転を制御するものである。このボス付きドラム
は、プレス成形したドラムと、鍛造成形して内周にスプ
ライン歯を加工したボスとからなり、ドラムとボスとを
個別に形成した後、ドラムにボスを圧入して溶接で結合
した部材である。On the other hand, a bossed drum used for a rear brake of a motorcycle has a boss attached to a rear axle and a brake shoe provided inside the drum.
The rotation of the rear wheel is controlled by pressing the inner periphery of the drum with the brake shoe. This bossed drum consists of a press-formed drum and a boss with forged splines on the inner periphery. After forming the drum and boss individually, press-fit the boss into the drum and join them by welding. It is the member which did.
【０００５】[0005]
【発明が解決しようとする課題】このボス付きドラム
も、上記公報の技術と同様に、ボスとドラムとを個別に
加工した後、それぞれの部材を結合する。このため、ド
ラムに対するボスの同軸度を出すことが難しく、また、
溶接で結合すると溶接熱による歪がボスやドラムに発生
する虞れがある。このため、ボス付きドラムの品質を均
一に保つことが難しい。また、ドラムとボスとを個別に
加工した後、それぞれを結合するので、製造に手間がか
かりボス付きドラムのコストを下げることが難しい。The boss-equipped drum also processes the boss and the drum individually and then connects the respective members in the same manner as in the above-mentioned publication. For this reason, it is difficult to obtain the coaxiality of the boss with respect to the drum,
If they are joined by welding, distortion due to welding heat may occur on the boss or drum. For this reason, it is difficult to keep the quality of the bossed drum uniform. In addition, since the drum and the boss are individually processed and then combined, it is difficult to manufacture the boss and it is difficult to reduce the cost of the boss-mounted drum.
【０００６】そこで、本発明の目的は、品質を均一に維
持することが容易で、且つコストを下げることができる
技術を提供することにある。Accordingly, an object of the present invention is to provide a technique capable of easily maintaining uniform quality and reducing costs.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に請求項１は、中央の小径筒状ボスと、このボスを同心
的に囲う大径筒状ドラムと、これらボスとドラムの一端
同士をつなぐ底部とからなるボス付きドラムの製造方法
であって、予め中央に孔を開けた平板を絞ってドラム用
の有底筒状体を成形する工程と、この有底筒状体の中央
部を逆絞りして開口側に向って小径筒部を成形する工程
と、この小径筒部を増肉してボスにする工程とからなる
ことを特徴とする。In order to achieve the above object, a first aspect of the present invention is to provide a small-diameter central cylindrical boss, a large-diameter cylindrical drum concentrically surrounding the boss, and one end of each of the boss and the drum. A step of forming a bottomed cylindrical body for the drum by squeezing a flat plate having a hole in the center in advance, and a center portion of the bottomed cylindrical body. And forming a small-diameter cylindrical portion toward the opening by reverse drawing, and increasing the thickness of the small-diameter cylindrical portion to form a boss.
【０００８】ボス付きドラムを平板から一体に成形する
ことができるので、別々に加工したドラムとボスとを加
締めや溶接で結合する必要がない。このため、ドラムに
対するボスの同軸度を容易に確保することができ、また
溶接熱でボスやドラムに歪が発生する虞れもない。ま
た、ボス付きドラムを平板から一体成形することができ
るので、ドラムとボスとの２つの部品を別々に加工して
から２つの部品を結合する工程と比較して加工工程を減
らすことができる。Since the bossed drum can be integrally formed from a flat plate, there is no need to connect the separately processed drum and the boss by crimping or welding. For this reason, the coaxiality of the boss with respect to the drum can be easily ensured, and there is no possibility that distortion occurs in the boss or the drum due to welding heat. Further, since the bossed drum can be integrally formed from a flat plate, the number of processing steps can be reduced as compared with the step of separately processing the two parts of the drum and the boss and then combining the two parts.
【０００９】請求項２は、小径筒部を増肉してボスにす
る工程を、小径筒部の先端の肉厚減少部を内側に折曲げ
て金型で挟み、先端を除く小径筒部を縮径し且つ軸方向
に潰すことにより増肉してボスにすることを特徴とす
る。According to a second aspect of the present invention, the step of increasing the thickness of the small-diameter cylindrical portion to form a boss is such that the reduced-thickness portion at the distal end of the small-diameter cylindrical portion is bent inward, and the small-diameter cylindrical portion excluding the distal end is sandwiched by a mold. It is characterized in that a boss is formed by increasing the wall thickness by reducing the diameter and crushing in the axial direction.
【００１０】肉厚減少部を折曲げて挟みながら小径筒部
を増肉するので、肉厚減少部を増肉する必要がない。こ
のため、小径筒部のうちの比較的肉厚の大きな部分を増
肉するだけでよいので、効率よく増肉することができ
る。小径筒部を縮径して増肉し、この増肉した小径筒部
を軸方向に潰してさらに増肉する。２種類の増肉方法を
採用することにより増肉率を高めることができる。Since the small-diameter cylindrical portion is increased in thickness while bending and sandwiching the reduced thickness portion, it is not necessary to increase the thickness of the reduced thickness portion. For this reason, it is only necessary to increase the thickness of the relatively thick portion of the small-diameter cylindrical portion, so that the thickness can be increased efficiently. The small diameter cylindrical portion is reduced in diameter to increase the thickness, and the increased small diameter cylindrical portion is crushed in the axial direction to further increase the thickness. The adoption of two types of thickening methods can increase the rate of thickening.
【００１１】請求項３は、小径筒部を増肉してボスにす
る工程を、小径筒部の先端の肉厚減少部を軸方向に延ば
し、先端を含む小径筒部を縮径し且つ軸方向に潰すこと
によりボスをストレート状に成形することを特徴とす
る。According to a third aspect of the present invention, the step of increasing the thickness of the small-diameter cylindrical portion to form a boss includes extending the reduced-thickness portion at the distal end of the small-diameter cylindrical portion in the axial direction, reducing the diameter of the small-diameter cylindrical portion including the distal end, and forming the boss. The boss is formed in a straight shape by crushing in the direction.
【００１２】小径筒部を縮径して増肉し、この増肉した
小径筒部を軸方向に潰してさらに増肉する。２種類の増
肉方法を採用することにより増肉率を高めることができ
るので、ボスをストレート状に成形して肉厚を均一に増
肉できる。The small diameter cylindrical portion is reduced in diameter to increase the wall thickness, and the increased small diameter cylindrical portion is crushed in the axial direction to further increase the wall thickness. By adopting the two types of thickening methods, the thickening rate can be increased, so that the boss can be formed in a straight shape and the thickness can be uniformly increased.
【００１３】請求項４は、小径筒部を増肉してボスにす
る工程を、小径筒部を縮径し且つ軸方向に潰すことによ
り先端の肉厚減少部を基端より小さく増肉して、ボスを
基端側から先端側に向けて小径となるテーパ状に成形す
ることを特徴とする。According to a fourth aspect of the present invention, the step of increasing the thickness of the small-diameter cylindrical portion to form a boss includes reducing the diameter of the small-diameter cylindrical portion and crushing the small-diameter cylindrical portion in the axial direction to increase the thickness of the thinned portion at the distal end to be smaller than the base end. The boss is formed in a tapered shape having a small diameter from the base end toward the tip end.
【００１４】ボスの形状を先端小径なテーパ状としたの
で、小径筒部の先端の肉厚減少部を、その他の比較的肉
厚の大きい部分に合せて、無理に増肉する必要がない。
このため、小径筒部を無理なく増肉することができる。
小径筒部を縮径して増肉し、この増肉した小径筒部を軸
方向に潰してさらに増肉する。２種類の増肉方法を採用
することにより増肉率を高めることができる。Since the shape of the boss is tapered with a small diameter at the tip, it is not necessary to forcibly increase the thickness of the small-diameter cylindrical portion at the tip of the small-diameter cylindrical portion in accordance with other relatively thick portions.
For this reason, the small-diameter cylindrical portion can be reasonably thickened.
The small diameter cylindrical portion is reduced in diameter to increase the thickness, and the increased small diameter cylindrical portion is crushed in the axial direction to further increase the thickness. The adoption of two types of thickening methods can increase the rate of thickening.
【００１５】[0015]
【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。なお、図面は符号の向きに見る
ものとする。図１は本発明に係る自動二輪車の後輪を示
す斜視図である。自動二輪車の後輪ユニット１は、図示
しないリヤアクスルに取り付けたボス付きドラム２と、
このボス付きドラム２に取付けたリヤホイール１５と、
このリヤホイール１５に取付けたリヤタイヤ１７と、ボ
ス付きドラム２の内部に配置したブレーキシューアッセ
ンブリ２０とからなる。なお、ボス付きドラム２につい
ては図２でさらに詳しく説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a perspective view showing a rear wheel of a motorcycle according to the present invention. The motorcycle rear wheel unit 1 includes a bossed drum 2 attached to a rear axle (not shown),
A rear wheel 15 attached to the bossed drum 2,
It comprises a rear tire 17 mounted on the rear wheel 15 and a brake shoe assembly 20 arranged inside the bossed drum 2. The bossed drum 2 will be described in more detail with reference to FIG.
【００１６】ブレーキシューアッセンブリ２０は、ピン
２１を支点にして開閉する一対のブレーキシュー２２，
２２と、これらのブレーキシュー２２，２２を閉じるた
めの引張ばね２４，２４と、これらの引張ばね２４，２
４のばね力に対向してブレーキシュー２２，２２を開く
カム２６と、このカム２６を操作するアーム２８とから
なる。The brake shoe assembly 20 includes a pair of brake shoes 22, which open and close using a pin 21 as a fulcrum.
22, tension springs 24, 24 for closing these brake shoes 22, 22, and these tension springs 24, 2
A cam 26 that opens the brake shoes 22, 22 in opposition to the spring force of No. 4 and an arm 28 that operates the cam 26.
【００１７】図２は本発明に係るボス付きドラムの断面
図である。ボス付きドラム２は、中央の小径筒状ボス４
と、このボス４を同心的に囲う大径筒状ドラム８と、こ
れらボス４とドラム８の一端同士をつなぐ底部１２とか
らなる。ボス４は、内周にリヤアクスル（図示しない）
に噛み合うスプライン歯６を設けた部材である。ドラム
８は、内周にブレーキシュー２２，２２（図１参照）を
押し付ける部材であって、開口側に拡径部１０を設けた
部材である。FIG. 2 is a sectional view of a bossed drum according to the present invention. The bossed drum 2 has a small cylindrical boss 4 at the center.
And a large-diameter cylindrical drum 8 concentrically surrounding the boss 4 and a bottom portion 12 connecting the boss 4 and one end of the drum 8. The boss 4 has a rear axle (not shown) on the inner periphery.
This is a member provided with spline teeth 6 that mesh with. The drum 8 is a member that presses the brake shoes 22, 22 (see FIG. 1) on the inner periphery, and is a member provided with the enlarged diameter portion 10 on the opening side.
【００１８】以上に述べた本発明に係るボス付きドラム
の製造方法を次に説明する。図３は本発明に係るボス付
きドラムの製造方法を説明するフロー図であり、ＳＴ×
×はステップ番号を示す。 ＳＴ０１；予め中央に小径の孔を開けた平板（ワーク）
を、図示しないトランスファー型の金型にセットして、
ワークを絞り加工することにより有底筒状体を絞り成形
する。 ＳＴ０２；ワークを逆絞り用の金型にセットして、有底
筒状体の中央部を逆絞りすることにより開口側に向って
小径筒部を成形する。Next, a method of manufacturing the bossed drum according to the present invention will be described. FIG. 3 is a flow chart for explaining a method of manufacturing a bossed drum according to the present invention.
X indicates a step number. ST01: Flat plate (work) with a small hole in the center in advance
Into a transfer mold (not shown)
The bottomed cylindrical body is drawn by drawing the work. ST02: The work is set in a mold for reverse drawing, and the central portion of the bottomed cylindrical body is reverse drawn to form a small-diameter cylindrical portion toward the opening side.
【００１９】ＳＴ０３；ワークを増肉用の金型にセット
して、小径筒部を縮径し且つ軸方向に潰して増肉してボ
スにする。 ＳＴ０４；ワークをスプライン歯を成形用の金型にセッ
トして、ボスの内周にスプライン歯を成形すると同時
に、大径筒状体の開口端部を仕上げてドラムにする。 上記ＳＴ０１〜ＳＴ０４の工程については図４〜図１３
でさらに詳しく説明する。ST03: The work is set in a mold for increasing the thickness, and the small-diameter cylindrical portion is reduced in diameter and crushed in the axial direction to increase the thickness to form a boss. ST04: The workpiece is set in a mold for forming spline teeth, and spline teeth are formed on the inner periphery of the boss. At the same time, the open end of the large-diameter cylindrical body is finished to be a drum. 4 to 13 for the steps ST01 to ST04.
This will be described in more detail.
【００２０】ＳＴ０１の有底筒状体を成形する工程につ
いて説明する。図４（ａ），（ｂ）は本発明に係るボス
付きドラムの製造方法の第１説明図である。（ａ）にお
いて、予め中央に孔３０ａを開けた円形の平板（ワー
ク）３０を、トランスファー型の第１金型にセットし、
ワーク３０の外周端３０ｂを第１金型のダイとホルダと
で挟み込む。（ｂ）において、第１金型のパンチ３１を
矢印ａの如く押し付けてワーク３０を絞って有底筒状体
３２にする。The step of forming the bottomed cylindrical body in ST01 will be described. FIGS. 4A and 4B are first explanatory views of the method of manufacturing a bossed drum according to the present invention. In (a), a circular flat plate (work) 30 having a hole 30a formed in the center in advance is set in a transfer-type first die,
The outer peripheral end 30b of the work 30 is sandwiched between the die of the first mold and the holder. In (b), the work 30 is squeezed by pressing the punch 31 of the first mold as shown by the arrow a to form the bottomed cylindrical body 32.
【００２１】ＳＴ０２の小径筒部を成形する工程につい
て説明する。図５（ａ）〜（ｃ）は本発明に係るボス付
きドラムの製造方法の第２説明図である。（ａ）におい
て、ワーク３０をトランスファー型の第２金型にセット
して外周端３０ｂを挟み込む。次に、第２金型のパンチ
３４を矢印ｂの如く押し付けて有底筒状体の中央を逆絞
り加工することにより有底筒状体の開口３２ａ側に向っ
て小径筒部３５を成形する。The step of forming a small-diameter cylindrical portion in ST02 will be described. FIGS. 5A to 5C are second explanatory views of the method for manufacturing a bossed drum according to the present invention. In (a), the work 30 is set in a transfer-type second mold, and the outer peripheral end 30b is sandwiched. Next, the small-diameter cylindrical portion 35 is formed toward the opening 32a side of the bottomed cylindrical body by pressing the punch 34 of the second mold as shown by the arrow b and reverse drawing the center of the bottomed cylindrical body. .
【００２２】（ｂ）において、ワーク３０をトランスフ
ァー型の第３金型にセットして外周端３０ｂを挟み込
む。第３金型のパンチ３６を矢印ｃの如く押し付けて逆
絞り加工する。第３金型のパンチ３６は第２金型のパン
チ３４より小径なので、小径筒部３５の直径ｄを縮径し
ながら絞り深さｈを深くできる。In (b), the work 30 is set in a transfer-type third mold and the outer peripheral end 30b is sandwiched. The punch 36 of the third mold is pressed as shown by the arrow c to perform reverse drawing. Since the punch 36 of the third die is smaller in diameter than the punch 34 of the second die, it is possible to increase the drawing depth h while reducing the diameter d of the small-diameter cylindrical portion 35.
【００２３】（ｃ）において、ワーク３０をトランスフ
ァー型の第４金型にセットして外周端３０ｂを挟み込
む。第４金型のパンチ３８を矢印ｄの如く押し付けて逆
絞り加工する。第４金型のパンチ３８は第３金型のパン
チ３６より小径なので、小径筒部３５の直径ｄをさらに
縮径しながら絞り深さｈをさらに深くできる。小径筒部
３５の先端（以下、「肉厚減少部」と記す。）３５ａは
逆絞り加工する際に、その他の小径筒部３５と比較して
肉厚が小さな肉厚減少部となる。In (c), the work 30 is set in a transfer-type fourth mold and the outer peripheral end 30b is sandwiched. The punch 38 of the fourth mold is pressed as shown by an arrow d to perform reverse drawing. Since the punch 38 of the fourth mold has a smaller diameter than the punch 36 of the third mold, the drawing depth h can be further increased while the diameter d of the small-diameter cylindrical portion 35 is further reduced. The tip (hereinafter, referred to as “thickness reducing portion”) 35 a of the small-diameter cylindrical portion 35 is a reduced-thickness portion having a smaller thickness than the other small-diameter cylindrical portions 35 when performing reverse drawing.
【００２４】ＳＴ０３の増肉工程について説明する。図
６（ａ），（ｂ）は本発明に係るボス付きドラムの製造
方法の第３説明図であり、第１増肉工程を示す。（ａ）
において、逆絞り加工したワーク３０をトランスファー
型の第５金型のダイ４０に載せて、上型４１を矢印ｅの
如く下降する。（ｂ）において、上型４１のホルダ４１
ａとダイ４０とでワーク３０の外周部３０ｂを挟み込
み、同時に上型４１のパンチ４１ｂで小径筒部３５の先
端を押圧する。The thickening step of ST03 will be described. FIGS. 6A and 6B are third explanatory views of the method of manufacturing the bossed drum according to the present invention, and show a first thickening step. (A)
In step (5), the work 30 subjected to reverse drawing is placed on a transfer-type fifth die 40, and the upper die 41 is lowered as indicated by an arrow e. In (b), the holder 41 of the upper die 41
The outer peripheral portion 30b of the work 30 is sandwiched between a and the die 40, and at the same time, the tip of the small-diameter cylindrical portion 35 is pressed by the punch 41b of the upper die 41.
【００２５】図７（ａ），（ｂ）は本発明に係るボス付
きドラムの製造方法の第４説明図であり、第１増肉工程
を示す。（ａ）において、第５金型のパンチリング４１
ｃを矢印ｆの如く下降することにより、小径筒部３５を
縮径する。（ｂ）は、小径筒部３５の外周にパンチリン
グ４１ｃによる絞り力Ｆが作用することにより、小径筒
部３５が縮径してＴ１からＴ２に増肉した状態を示す。FIGS. 7A and 7B are fourth explanatory views of the method of manufacturing a bossed drum according to the present invention, showing a first thickening step. In (a), the punch ring 41 of the fifth mold is used.
The diameter of the small-diameter cylindrical portion 35 is reduced by lowering c as indicated by an arrow f. (B) shows a state in which the small-diameter cylindrical portion 35 is reduced in diameter and increased in thickness from T1 to T2 due to the drawing force F by the punch ring 41c acting on the outer periphery of the small-diameter cylindrical portion 35.
【００２６】図８（ａ），（ｂ）は本発明に係るボス付
きドラムの製造方法の第５説明図であり、第１増肉工程
を示す。（ａ）において、パンチ４１ｂ及びパンチリン
グ４１ｃを同時に矢印ｇの如くＬ１下降させる。FIGS. 8A and 8B are fifth explanatory views of the method of manufacturing a bossed drum according to the present invention, showing a first thickening step. In (a), the punch 41b and the punch ring 41c are simultaneously lowered L1 as indicated by an arrow g.
【００２７】（ｂ）において、パンチ４１ｂ及びパンチ
リング４１ｃを所定位置まで下降することにより、小径
筒部３５を軸方向に潰して（ａ）に示したＴ２からＴ３
まで増肉する。これで第１増肉工程が完了する。このと
き、小径筒部３５の肉厚の小さい肉厚減少部３５ａを内
側に折曲げて、この肉厚減少部３５ａをパンチ４１ｂと
ノックアウト４３とで挟み込みながら小径筒部３５を軸
方向に潰すので、肉厚の小さい肉厚減少部３５ａを増肉
する必要がない。このため、小径筒部３５のなかの比較
的肉厚の大きな部分のみを増肉すればよいので、小径筒
部３５を効率よく均一に増肉することができる。第１増
肉工程の完了後、上型４１を矢印ｈの如く上昇させて、
次いで、ノックアウトリング４４を矢印ｉの如く上昇し
てワーク３０を第５金型から取り出す。In FIG. 3B, the small-diameter cylindrical portion 35 is crushed in the axial direction by lowering the punch 41b and the punch ring 41c to predetermined positions.
To increase meat. This completes the first thickening step. At this time, the small-diameter cylindrical portion 35 is bent inward while the small-thickness reduced portion 35a of the small-diameter cylindrical portion 35 is bent inward, and the small-diameter cylindrical portion 35 is crushed in the axial direction while sandwiching the reduced-thickness portion 35a between the punch 41b and the knockout 43. In addition, there is no need to increase the thickness of the small thickness reduced portion 35a. For this reason, only the relatively thick portion of the small-diameter cylindrical portion 35 needs to be thickened, so that the small-diameter cylindrical portion 35 can be efficiently and uniformly thickened. After the completion of the first thickening step, the upper mold 41 is raised as shown by the arrow h,
Next, knockout ring 44 is raised as indicated by arrow i, and work 30 is taken out of the fifth mold.
【００２８】図９（ａ），（ｂ）は本発明に係るボス付
きドラムの製造方法の第６説明図であり、第２増肉工程
を示す。（ａ）は、第５金型から取り出したワーク３０
を示す。（ｂ）において、ワーク３０をトランスファー
型の第６金型のダイ４６に載せて、上型４７を矢印ｊの
如く下降させる。FIGS. 9A and 9B are sixth explanatory views of the method of manufacturing a bossed drum according to the present invention, showing a second thickening step. (A) is a work 30 taken out from the fifth mold.
Is shown. In (b), the work 30 is placed on the transfer-type sixth die 46 and the upper die 47 is lowered as indicated by the arrow j.
【００２９】図１０（ａ），（ｂ）は本発明に係るボス
付きドラムの製造方法の第７説明図であり、第２増肉工
程を示す。（ａ）において、ダイ４６と上型４７のホル
ダ４７ａとでワーク３０の外周部３０ｂを挟み込み、同
時に上型４７のパンチ４７ｂを小径筒部３５の肉厚減少
部３５ａに押付ける。FIGS. 10A and 10B are seventh explanatory views of the method for manufacturing a bossed drum according to the present invention, showing a second thickening step. 6A, the outer peripheral portion 30b of the work 30 is sandwiched between the die 46 and the holder 47a of the upper die 47, and at the same time, the punch 47b of the upper die 47 is pressed against the reduced thickness portion 35a of the small diameter cylindrical portion 35.
【００３０】次に、パンチリング４７ｃを矢印ｋの如く
下降してパンチリング４７ｃで小径筒部３５を縮径す
る。このとき、図７（ｂ）と同様に、小径筒部３５の外
周にパンチリング４７ｃによる絞り力が作用するので、
小径筒部３５が縮径して増肉する。（ｂ）において、パ
ンチ４７ｂ及びパンチリング４７ｃを同時に矢印ｍ，ｎ
の如くＬ２下降させる。Next, the punch ring 47c is lowered as indicated by the arrow k, and the small-diameter cylindrical portion 35 is reduced in diameter by the punch ring 47c. At this time, as in the case of FIG. 7B, the drawing force by the punch ring 47c acts on the outer periphery of the small-diameter cylindrical portion 35.
The small-diameter cylindrical portion 35 is reduced in diameter to increase the thickness. In (b), the punch 47b and the punch ring 47c are simultaneously moved by arrows m and n.
L2 is lowered as shown in FIG.
【００３１】図１１（ａ）〜（ｃ）は本発明に係るボス
付きドラムの製造方法の第８説明図であり、第２増肉工
程を示す。（ａ）において、パンチ４７ｂ及びパンチリ
ング４７ｃを所定位置まで下降することにより、小径筒
部３５を軸方向に潰してＴ４まで増肉する。これで第２
増肉工程が完了する。FIGS. 11A to 11C are eighth explanatory views of the method for manufacturing a bossed drum according to the present invention, showing a second thickening step. In (a), by lowering the punch 47b and the punch ring 47c to predetermined positions, the small-diameter cylindrical portion 35 is crushed in the axial direction to increase the thickness to T4. This is the second
The thickening process is completed.
【００３２】第２増肉工程のときも第１増肉工程と同様
に、肉厚減少部３５ａをパンチ４７ｂとノックアウト４
９とで挟み込みながら小径筒部３５を軸方向に潰すので
肉厚減少部３５ａを増肉する必要がない。このため、小
径筒部３５のなかの比較的肉厚の大きな部分のみを増肉
すればよいので、小径筒部３５を効率よく均一に増肉で
きる。第２増肉工程の完了後、上型４７を矢印ｐの如く
上昇し、次いで、ノックアウトリング５０を矢印ｑの如
く上昇させてワーク３０を第６金型から取り出す。At the time of the second thickening step, similarly to the first thickening step, the thickness-reducing portion 35a is connected to the punch 47b and the knockout 4a.
9, the small-diameter cylindrical portion 35 is crushed in the axial direction, so that it is not necessary to increase the thickness of the reduced thickness portion 35a. For this reason, only the relatively thick part of the small-diameter cylindrical portion 35 needs to be thickened, and the small-diameter cylindrical portion 35 can be efficiently and uniformly thickened. After the completion of the second thickening step, the upper die 47 is raised as shown by the arrow p, and then the knockout ring 50 is raised as shown by the arrow q, and the work 30 is taken out from the sixth die.
【００３３】（ｂ）は、第６金型から取り出したワーク
３０を示す。このワーク３０をトランスファー型の第７
金型にセットして、第２増肉工程と同様に小径筒部３５
を第３増肉工程で増肉する。(B) shows the work 30 taken out from the sixth mold. This work 30 is transferred to a transfer-type seventh
It is set in a mold and the small-diameter cylindrical portion 35 is set in the same manner as in the second thickening step.
In the third meat increasing step.
【００３４】（ｃ）は、第３増肉工程で小径筒部をＴ５
まで増肉してボス４（図２も参照）にしたワーク３０を
示す。第３増肉工程のときも、第１増肉工程や第２増肉
工程と同様に、肉厚減少部３５ａをパンチとノックアウ
トとで挟み込みながら小径筒部３５を軸方向に潰すので
肉厚減少部３５ａを増肉する必要がない。このため、小
径筒部３５のなかの比較的肉厚の大きな部分のみを増肉
すればよいので、ボス４を効率よく均一に増肉すること
ができる。(C) shows that the small-diameter cylindrical portion is set to T5 in the third thickening step.
The work 30 having the boss 4 (see also FIG. 2) which has been increased in thickness is shown. At the time of the third thickening step, similarly to the first thickening step and the second thickening step, the small-diameter cylindrical portion 35 is crushed in the axial direction while the thinned portion 35a is sandwiched between the punch and the knockout, so that the thickness is reduced. There is no need to increase the thickness of the portion 35a. For this reason, only the relatively thick portion of the small-diameter cylindrical portion 35 needs to be thickened, so that the boss 4 can be efficiently and uniformly thickened.
【００３５】ＳＴ０４のスプライン歯成形工程について
説明する。図１２（ａ），（ｂ）は本発明に係るボス付
きドラムの製造方法の第９説明図であり、スプライン加
工工程を示す。（ａ）において、ワーク３０をトランス
ファー型の第８金型のノックアウトリング５２に載せ
て、上型５３を矢印ｒの如く下降する。The spline tooth forming step of ST04 will be described. FIGS. 12A and 12B are ninth explanatory views of the method of manufacturing the bossed drum according to the present invention, showing a spline processing step. In (a), the work 30 is placed on the knockout ring 52 of the transfer-type eighth die, and the upper die 53 is lowered as shown by the arrow r.
【００３６】（ｂ）において、上型５３のパンチ５３ａ
及びパンチリング５３ｂをワーク３０に押し付ける。こ
のとき、ボス４は、外周４ａがパンチリング５３ｂの内
周に接触し、基端４ｂがノックアウトリング５２の上端
に接触し、先端４ｃがパンチ５３ａの下端に接触する。
また、パンチ５３ａの下端には穴５４を形成し、パンチ
５３ａの肉厚Ｔ６をボス４の肉厚Ｔ５より小さく設定す
る。In (b), the punch 53a of the upper die 53
Then, the punch ring 53b is pressed against the work 30. At this time, the outer periphery 4a of the boss 4 contacts the inner periphery of the punch ring 53b, the base end 4b contacts the upper end of the knockout ring 52, and the tip 4c contacts the lower end of the punch 53a.
A hole 54 is formed at the lower end of the punch 53a, and the thickness T6 of the punch 53a is set smaller than the thickness T5 of the boss 4.
【００３７】この状態で、上型５３のパンチ５３ａ及び
パンチリング５３ｂを矢印ｓの如く下降することによ
り、パンチ５３ａ及びパンチリング５３ｂの押下力でワ
ーク３０及びノックアウトリング５２を同時に下降させ
る。In this state, by lowering the punch 53a and the punch ring 53b of the upper die 53 as shown by the arrow s, the work 30 and the knockout ring 52 are simultaneously lowered by the pressing force of the punch 53a and the punch ring 53b.
【００３８】図１３（ａ），（ｂ）は本発明に係るボス
付きドラムの製造方法の第１０説明図であり、スプライ
ン加工工程を示す。（ａ）において、ボス４をスプライ
ン歯形パンチ５６に嵌め込むことにより、ボス４の内周
にスプライン歯６（図２参照）を成形すると同時に、ワ
ーク３０の開口端部としての外周部３０ｂ（図１２
（ｂ）参照）をダイ５９とパンチリング５３ｂとでしご
いて有底筒状体３２の開口側に拡径部１０（図２も参
照）を成形することによりドラム８（図２参照）にす
る。これでボス付きドラム２の成形工程が完了する。FIGS. 13A and 13B are tenth explanatory views of the method of manufacturing a bossed drum according to the present invention, showing a spline processing step. 2A, the spline teeth 6 (see FIG. 2) are formed on the inner periphery of the boss 4 by fitting the boss 4 into the spline tooth-shaped punch 56, and at the same time, the outer peripheral portion 30b (see FIG. 12
(See FIG. 2B) with the die 59 and the punch ring 53b to form the enlarged diameter portion 10 (see also FIG. 2) on the opening side of the bottomed tubular body 32, thereby forming the drum 8 (see FIG. 2). I do. This completes the step of forming the bossed drum 2.
【００３９】ところで、スプライン歯６を形成する際
に、ボス４は、外周４ａがパンチリング５３ｂの内周に
接触し、基端４ｂがノックアウトリング５２の上端に接
触し、先端４ｃがパンチ５３ａの下端に接触している。
このため、ボス４の内径より最外周が大径のスプライン
歯形パンチ５６にボス４を嵌め込んでも、ボス４の内周
が外側に逃げる虞れはないので、ボス４の内周にスプラ
イン歯６を精度よく加工することができる。When the spline teeth 6 are formed, the outer periphery 4a of the boss 4 contacts the inner periphery of the punch ring 53b, the base end 4b contacts the upper end of the knockout ring 52, and the tip 4c of the boss 4 Contacting the lower end.
For this reason, even if the boss 4 is fitted into the spline tooth-shaped punch 56 whose outermost circumference is larger than the inner diameter of the boss 4, there is no possibility that the inner circumference of the boss 4 escapes outside. Can be accurately processed.
【００４０】また、パンチ５３ａの肉厚Ｔ６をボス４の
肉厚Ｔ５より小さく設定したので、スプライン歯形パン
チ５６の先端がパンチ５３ａの穴５４に入り込んでも、
スプライン歯形パンチ５６がパンチ５３ａに干渉する虞
れはない。さらに、パンチ５３ａの肉厚Ｔ６をボス４の
肉厚Ｔ５より小さく設定したので、ボス４の内周にスプ
ライン歯６（図２参照）を成形する際に、ボス４の先端
４ｃに余肉（例えば、バリ）が発生しても、この余肉を
パンチ５３ａの穴５４に逃がすことができる。Since the thickness T6 of the punch 53a is set smaller than the thickness T5 of the boss 4, even if the tip of the spline tooth punch 56 enters the hole 54 of the punch 53a,
There is no risk that the spline tooth-shaped punch 56 will interfere with the punch 53a. Furthermore, since the thickness T6 of the punch 53a is set smaller than the thickness T5 of the boss 4, when forming the spline teeth 6 (see FIG. For example, even if burrs occur, the excess can be released to the hole 54 of the punch 53a.
【００４１】（ｂ）は、第８金型から取り出したワーク
３０を示す。このワーク３０の中央に成形したボス４の
先端４ｃを機械加工することにより、図２に示すボス付
きドラム２になる。(B) shows the work 30 taken out from the eighth die. By machining the tip 4c of the boss 4 formed in the center of the work 30, the bossed drum 2 shown in FIG. 2 is obtained.
【００４２】前記実施の形態では、ボス４の内周にスプ
ライン歯を成形する工程と、有底筒状体３２の開口部に
拡径部１０を成形する工程とを同時に実施する方法につ
いて説明したが、それぞれの工程を別々に実施しても前
記実施の形態と同様の効果を得ることができる。In the above-described embodiment, a method has been described in which the step of forming the spline teeth on the inner periphery of the boss 4 and the step of forming the enlarged diameter portion 10 in the opening of the bottomed cylindrical body 32 are performed simultaneously. However, the same effect as in the above embodiment can be obtained even if each step is performed separately.
【００４３】前記実施の形態ではトランスファー型を使
用してボス付きドラムを成形する方法について説明した
が、その他の方法として、例えば順送り型を使用してボ
ス付きドラムを成形することも可能である。In the above-described embodiment, a method of forming a bossed drum using a transfer die has been described. However, as another method, for example, a bossed drum can be formed using a progressive die.
【００４４】次に、第２実施例を図１４〜図１９で説明
する。第２実施例のボス付きドラムの製造方法は、第１
実施例のＳＴ０１〜ＳＴ０４のうちのＳＴ０３（増肉工
程）が異なるだけなので、ＳＴ０３のみを説明する。Next, a second embodiment will be described with reference to FIGS. The method of manufacturing the bossed drum of the second embodiment is as follows.
Since only ST03 (thickening step) of ST01 to ST04 of the embodiment is different, only ST03 will be described.
【００４５】図１４（ａ），（ｂ）は本発明に係るボス
付きドラム（第２実施例）の製造方法の第１説明図であ
り、第１増肉工程を示す。（ａ）において、逆絞り加工
したワーク６０をトランスファー型の金型のダイ６１に
載せて、上型６２を矢印の如く下降する。（ｂ）にお
いて、上型６２のホルダ６３とダイ６１とでワーク６０
の外周部６０ａを挟み込む。ワーク６０が下降する際に
小径筒部６６の先端孔６７ａをノックアウト６８の先端
６８ａに嵌込み、上型６２のパンチ６４を小径筒部６６
の先端（以下「肉厚減少部」と記す。）６７に押付け
る。FIGS. 14A and 14B are first explanatory views of a method of manufacturing a bossed drum (second embodiment) according to the present invention, showing a first thickening step. In (a), the reverse drawn workpiece 60 is placed on a transfer die 60 and the upper die 62 is lowered as shown by the arrow. In (b), the work 60 is held by the holder 63 of the upper die 62 and the die 61.
Is sandwiched. When the work 60 descends, the tip hole 67a of the small-diameter cylinder portion 66 is fitted into the tip 68a of the knockout 68, and the punch 64 of the upper die 62 is inserted into the small-diameter cylinder portion 66.
(Hereinafter referred to as “thickness reduced portion”) 67.
【００４６】図１５（ａ），（ｂ）は本発明に係るボス
付きドラム（第２実施例）の製造方法の第２説明図であ
り、第１増肉工程を示す。（ａ）において、第５金型の
パンチリング６５を矢印の如く下降することにより、
小径内部６６を縮径する。（ｂ）は、小径筒部６６の外
周にパンチリング６５による絞り力Ｆが作用することに
より、小径筒部６６が縮径してＴ１０からＴ１１に増肉
した状態を示す。FIGS. 15A and 15B are second explanatory views of the method of manufacturing the bossed drum (second embodiment) according to the present invention, and show a first thickening step. In (a), by lowering the punch ring 65 of the fifth mold as shown by the arrow,
The small diameter interior 66 is reduced in diameter. (B) shows a state in which the small-diameter cylindrical portion 66 is reduced in diameter and increased in thickness from T10 to T11 by the application of the drawing force F by the punch ring 65 to the outer periphery of the small-diameter cylindrical portion 66.
【００４７】図１６（ａ），（ｂ）は本発明に係るボス
付きドラム（第２実施例）の製造方法の第３説明図であ
り、第１増肉工程を示す。（ａ）において、パンチ６４
及びパンチリング６５を同時に矢印の如くＬ１下降す
る。FIGS. 16 (a) and 16 (b) are third explanatory views of a method of manufacturing a bossed drum (second embodiment) according to the present invention, and show a first thickening step. In (a), the punch 64
And the punch ring 65 is simultaneously lowered by L1 as shown by the arrow.
【００４８】（ｂ）において、パンチ６４及びパンチリ
ング６５を所定位置まで下降することにより、小径筒部
６６を軸方向に潰して（ａ）に示したＴ１１からＴ１２
まで増肉する。このとき、小径筒部６６の肉厚減少部６
７もパンチ６４で潰して増肉する。これで第１増肉工程
が完了する。第１増肉工程の完了後、上型６２を矢印
の如く上昇させ、次いで、ノックアウトリング８０を矢
印の如く上昇してワーク６０を金型から取り出す。In (b), the punch 64 and the punch ring 65 are lowered to a predetermined position, so that the small-diameter cylindrical portion 66 is crushed in the axial direction, from T11 to T12 shown in (a).
To increase meat. At this time, the reduced thickness portion 6 of the small diameter cylindrical portion 66
7 is also crushed by the punch 64 to increase the thickness. This completes the first thickening step. After the completion of the first thickening step, the upper die 62 is raised as shown by the arrow, and then the knockout ring 80 is raised as shown by the arrow, and the work 60 is taken out of the die.
【００４９】図１７（ａ），（ｂ）は本発明に係るボス
付きドラム（第２実施例）の製造方法の第４説明図であ
り、第２増肉工程を示す。（ａ）は、金型から取り出し
たワーク６０を示す。（ｂ）において、ワーク６０をト
ランスファー型で下流側の金型のダイ８５に載せて、上
型８６を矢印の如く下降させる。FIGS. 17A and 17B are fourth explanatory views of the method of manufacturing the bossed drum (second embodiment) according to the present invention, and show a second thickening step. (A) shows the work 60 taken out from the mold. In (b), the work 60 is placed on a die 85 of a transfer-side mold and the upper mold 86 is lowered as shown by the arrow.
【００５０】図１８（ａ），（ｂ）は本発明に係るボス
付きドラム（第２実施例）の製造方法の第５説明図であ
り、第２増肉工程を示す。（ａ）において、ダイ８５と
上型８６のホルダ８７とでワーク６０の外周部６０ａを
挟み込み、同時に上型８６のパンチ８８で小径筒部６６
の肉厚減少部６７を押付ける。FIGS. 18A and 18B are fifth explanatory views of a method of manufacturing a bossed drum (second embodiment) according to the present invention, and show a second thickening step. 9A, the outer peripheral portion 60a of the work 60 is sandwiched between the die 85 and the holder 87 of the upper die 86, and at the same time, the small-diameter cylindrical portion 66 is pressed by the punch 88 of the upper die 86.
Is pressed down.
【００５１】次に、パンチリング８９を矢印の如く下
降してパンチリング８９で小径筒部６６を縮径する。こ
のとき、図１５（ｂ）と同様に、小径筒部６６の外周に
パンチリング８９による絞り力が作用するので、小径筒
部６６が縮径して増肉する。（ｂ）において、パンチ８
８及びパンチリング８９を同時に矢印の如くＬ２下降
する。Next, the punch ring 89 is lowered as shown by the arrow, and the small-diameter cylindrical portion 66 is reduced in diameter by the punch ring 89. At this time, as in the case of FIG. 15B, a drawing force by the punch ring 89 acts on the outer periphery of the small-diameter cylindrical portion 66, so that the small-diameter cylindrical portion 66 is reduced in diameter and increased in thickness. In (b), the punch 8
8 and the punch ring 89 are simultaneously lowered L2 as indicated by the arrow.
【００５２】図１９（ａ）〜（ｃ）は本発明に係るボス
付きドラム（第２実施例）の製造方法の第６説明図であ
り、第２増肉工程を示す。（ａ）において、パンチ８８
及びパンチリング８９を所定位置まで下降することによ
り、小径筒部６６を軸方向に潰してＴ１３まで増肉す
る。このとき、小径筒部６６の肉厚減少部６７もパンチ
８８で潰して増肉する。これで第２増肉工程が完了す
る。第２増肉工程の完了後、上型８６を矢印の如く上
昇し、次いで、ノックアウトリング９０を矢印の如く上
昇させてワーク６０を金型から取り出す。FIGS. 19 (a) to 19 (c) are sixth explanatory views of a method of manufacturing a bossed drum (second embodiment) according to the present invention, showing a second thickening step. In (a), the punch 88
By lowering the punch ring 89 to a predetermined position, the small-diameter cylindrical portion 66 is crushed in the axial direction to increase the thickness to T13. At this time, the reduced thickness portion 67 of the small diameter cylindrical portion 66 is also crushed by the punch 88 to increase the thickness. This completes the second thickening step. After the completion of the second thickening step, the upper die 86 is raised as shown by the arrow, and then the knockout ring 90 is raised as shown by the arrow, and the work 60 is taken out of the die.
【００５３】（ｂ）は、金型から取り出したワーク６０
を示す。このワーク６０をトランスファー型で下流側の
金型にセットして、第２増肉工程と同様に小径筒部６６
を第３増肉工程で増肉する。（ｃ）は、第３増肉工程で
小径筒部をＴ１４まで増肉してストレート状のボス９２
にしたワーク６０を示す。(B) shows the work 60 taken out of the mold.
Is shown. The work 60 is set in a downstream mold by a transfer mold, and the small-diameter cylindrical portion 66 is set in the same manner as in the second thickening step.
In the third meat increasing step. (C) is to increase the thickness of the small-diameter cylindrical portion to T14 in the third thickening step and to increase the straight boss 92.
2 shows a work 60 which has been set as shown in FIG.
【００５４】次に、第３実施例を図２０〜図２２で説明
する。第３実施例のボス付きドラムの製造方法は、第２
実施例のＳＴ０３（増肉工程）うちの第３増肉工程が異
なるだけなので、第３増肉工程のみを説明する。Next, a third embodiment will be described with reference to FIGS. The method of manufacturing the bossed drum of the third embodiment
Since only the third thickening step in ST03 (thickening step) of the embodiment is different, only the third thickening step will be described.
【００５５】図２０（ａ），（ｂ）は本発明に係るボス
付きドラム（第３実施例）の製造方法の第１説明図であ
り、第３増肉工程を示す。（ａ）において、第２実施例
の第２増肉工程で成形したワーク９４（図１９（ｂ）の
ワーク６０と同一形状）をトランスファー型の金型のダ
イ９５に載せて、上型９６を白抜き矢印の如く下降す
る。FIGS. 20 (a) and 20 (b) are first explanatory views of a method of manufacturing a bossed drum (third embodiment) according to the present invention, and show a third thickening step. In (a), a work 94 (having the same shape as the work 60 in FIG. 19B) formed in the second thickening step of the second embodiment is placed on a transfer die 95, and the upper die 96 is moved. It descends like a white arrow.
【００５６】（ｂ）において、ダイ９５と上型９６のホ
ルダ９７とでワーク９４の外周部９４ａを挟み込み、同
時に上型９６のパンチ９８を小径筒部１００の肉厚減少
部１０１に押付ける。次に、パンチリング９９を白抜き
矢印の如く下降してパンチリング９９で小径筒部１０
０を縮径する。このとき、小径筒部１００の外周にパン
チリング９９による絞り力が作用するので、小径筒部１
００が縮径して増肉する。In (b), the outer periphery 94 a of the work 94 is sandwiched between the die 95 and the holder 97 of the upper die 96, and at the same time, the punch 98 of the upper die 96 is pressed against the reduced thickness portion 101 of the small-diameter cylindrical portion 100. Next, the punch ring 99 is lowered as indicated by the white arrow, and the small-diameter cylindrical portion 10 is
0 is reduced in diameter. At this time, since the drawing force by the punch ring 99 acts on the outer periphery of the small-diameter cylindrical portion 100, the small-diameter cylindrical portion 1
00 is reduced in diameter and increased in thickness.
【００５７】図２１（ａ），（ｂ）は本発明に係るボス
付きドラム（第３実施例）の製造方法の第２説明図であ
り、第３増肉工程を示す。（ａ）において、パンチ９８
及びパンチリング９９を同時に白抜き矢印の如くＬ３
下降する。（ｂ）において、パンチ９８及びパンチリン
グ９９を所定位置まで下降することにより、小径筒部１
００を軸方向に潰して基端側から先端側に向けて小径と
なるテーパ状に増肉する。これで第３増肉工程が完了す
る。FIGS. 21 (a) and 21 (b) are second explanatory views of a method of manufacturing a bossed drum (third embodiment) according to the present invention, and show a third thickening step. In (a), the punch 98
And punch ring 99 at the same time as indicated by the white arrow L3
Descend. In (b), by lowering the punch 98 and the punch ring 99 to predetermined positions, the small-diameter cylindrical portion 1
00 is crushed in the axial direction to increase the thickness in a tapered shape having a smaller diameter from the base end side toward the distal end side. This completes the third thickening step.
【００５８】第３実施例によれば、小径筒部１００の先
端の肉厚減少部１０１を無理に大きく増肉する必要がな
いので、小径筒部１００を無理なく増肉することができ
る。第３増肉工程の完了後、上型９６を白抜き矢印の
如く上昇し、次いで、ノックアウトリング９９を白抜き
矢印の如く上昇させてワーク９４を金型から取り出
す。According to the third embodiment, it is not necessary to forcibly increase the thickness of the reduced thickness portion 101 at the tip of the small-diameter cylindrical portion 100, so that the small-diameter cylindrical portion 100 can be reasonably thickened. After the completion of the third thickening step, the upper mold 96 is raised as shown by the white arrow, and then the knockout ring 99 is raised as shown by the white arrow, and the work 94 is taken out of the mold.
【００５９】図２２は本発明に係るボス付きドラム（第
３実施例）の製造方法の第３説明図であり、第３増肉工
程を示す。第３増肉工程で小径筒部６６を軸方向に潰し
て基端側から先端側に向けて小径となるテーパ状に増肉
してボス１０２にしたワーク９４を示す。ボス１０２
は、先端を小径Ｄ１とし且つ基端を大径Ｄ２に成形した
ものである。ボス１０２は基端を大径としたので強度的
に問題はない。FIG. 22 is a third explanatory view of the method of manufacturing the bossed drum (third embodiment) according to the present invention, and shows a third thickening step. A work 94 in which the small-diameter cylindrical portion 66 is crushed in the axial direction in the third wall-thickening step and the boss 102 is formed by increasing the taper shape so that the diameter becomes smaller from the base end toward the tip end is shown. Boss 102
Has a small diameter D1 at the distal end and a large diameter D2 at the proximal end. Since the base of the boss 102 has a large diameter, there is no problem in strength.
【００６０】前記第３実施例では、小径筒部１００の肉
厚減少部１０１をパンチ９８で潰して第２実施例と同様
に増肉する内容について説明したが、例えば第１実施例
のように肉厚減少部１０１を折曲げて増肉しないように
してもよい。肉厚減少部１０１を増肉する必要がないの
で増肉率をさらに高めることができる。In the third embodiment, the content in which the thickness reduction portion 101 of the small-diameter cylindrical portion 100 is crushed by the punch 98 to increase the thickness in the same manner as in the second embodiment has been described. The thickness reduction portion 101 may be bent so as not to increase the thickness. Since it is not necessary to increase the thickness of the thickness reducing portion 101, the rate of increasing the thickness can be further increased.
【００６１】[0061]
【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項１は、ボス付きドラムを平板から一体に成
形することができるので、別々に加工したドラムとボス
とを加締めや溶接で一体に結合する必要がない。このた
め、ドラムに対するボスの同軸度を容易に確保すること
ができ、また溶接熱でボスやドラムに歪が発生する虞れ
もない。この結果、ボス付きドラムの品質を均一に保つ
ことが容易にできる。According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect, since the drum with the boss can be integrally formed from a flat plate, it is not necessary to integrally connect the separately processed drum and the boss by crimping or welding. For this reason, the coaxiality of the boss with respect to the drum can be easily ensured, and there is no possibility that distortion occurs in the boss or the drum due to welding heat. As a result, it is easy to keep the quality of the bossed drum uniform.
【００６２】また、ボス付きドラムを平板から一体に成
形できるので、ドラムとボスとの２つの部品を別々に加
工してから２つの部品を結合する工程と比較して加工工
程を大巾に削減することができる。この結果、生産性が
向上してボス付きドラムのコストを下げることができ
る。さらに、例えばトランスファー型を使用して、ボス
付きドラムを連続的に成形することにより効率良く生産
できるので、ボス付きドラムのコストを下げることがで
きる。Further, since the drum with the boss can be integrally formed from a flat plate, the number of processing steps is greatly reduced as compared with the step of separately processing the two parts of the drum and the boss and then joining the two parts. can do. As a result, the productivity is improved and the cost of the bossed drum can be reduced. Furthermore, since the bossed drum can be efficiently produced by continuously molding the bossed drum using, for example, a transfer die, the cost of the bossed drum can be reduced.
【００６３】請求項２は、肉厚減少部を折曲げて挟みな
がら小径筒部を増肉するので、肉厚減少部を増肉する必
要がない。このため、小径筒部のうちの比較的肉厚の大
きな部分を増肉するだけでよいので、効率よく増肉する
ことができる。この結果、ボスの肉厚を均一に成形する
ことができるので品質が向上する。小径筒部を縮径して
増肉し、この増肉した小径筒部を軸方向に潰してさらに
増肉する。２種類の増肉方法を採用することにより増肉
率を高めることができる。According to the second aspect, since the small-diameter cylindrical portion is increased in thickness while bending and sandwiching the reduced-thickness portion, it is not necessary to increase the thickness in the reduced-thickness portion. For this reason, it is only necessary to increase the thickness of the relatively thick portion of the small-diameter cylindrical portion, so that the thickness can be increased efficiently. As a result, the thickness of the boss can be uniformly formed, and the quality is improved. The small diameter cylindrical portion is reduced in diameter to increase the thickness, and the increased small diameter cylindrical portion is crushed in the axial direction to further increase the thickness. The adoption of two types of thickening methods can increase the rate of thickening.
【００６４】請求項３は、小径筒部を縮径して増肉し、
この増肉した小径筒部を軸方向に潰してさらに増肉す
る。２種類の増肉方法を採用することにより増肉率を高
めることができる。この結果、ボスをストレート状に成
形して肉厚を均一に増肉することができるので品質が向
上する。In the third aspect, the small-diameter cylindrical portion is reduced in diameter to increase the thickness.
The thickened small-diameter cylindrical portion is crushed in the axial direction to further increase the thickness. The adoption of two types of thickening methods can increase the rate of thickening. As a result, since the boss can be formed in a straight shape and the thickness can be increased uniformly, the quality is improved.
【００６５】請求項４は、ボスの形状を先端小径なテー
パ状としたので、小径筒部の先端の肉厚減少部を、その
他の比較的肉厚の大きい部分に合せて、無理に増肉する
必要がない。このため、小径筒部を無理なく増肉するこ
とができるので、品質が向上する。小径筒部を縮径して
増肉し、この増肉した小径筒部を軸方向に潰してさらに
増肉する。２種類の増肉方法を採用することにより増肉
率を高めることができる。According to a fourth aspect of the present invention, since the shape of the boss is tapered with a small diameter at the tip, the reduced thickness portion at the tip of the small diameter cylindrical portion is forcibly increased in thickness in accordance with the other relatively large thickness portion. No need to do. Therefore, the thickness of the small-diameter cylindrical portion can be increased without difficulty, and the quality is improved. The small diameter cylindrical portion is reduced in diameter to increase the thickness, and the increased small diameter cylindrical portion is crushed in the axial direction to further increase the thickness. The adoption of two types of thickening methods can increase the rate of thickening.
【図１】本発明に係る自動二輪車の後輪を示す斜視図FIG. 1 is a perspective view showing a rear wheel of a motorcycle according to the present invention.
【図２】本発明に係るボス付きドラム（第１実施例）の
断面図FIG. 2 is a sectional view of a bossed drum (first embodiment) according to the present invention.
【図３】本発明に係るボス付きドラム（第１実施例）の
製造方法を説明するフロー図FIG. 3 is a flowchart illustrating a method of manufacturing a bossed drum (first embodiment) according to the present invention.
【図４】本発明に係るボス付きドラム（第１実施例）の
製造方法の第１説明図FIG. 4 is a first explanatory view of a method for manufacturing a bossed drum (first embodiment) according to the present invention.
【図５】本発明に係るボス付きドラム（第１実施例）の
製造方法の第２説明図FIG. 5 is a second explanatory view of the method of manufacturing the bossed drum (first embodiment) according to the present invention.
【図６】本発明に係るボス付きドラム（第１実施例）の
製造方法の第３説明図FIG. 6 is a third explanatory view of the method of manufacturing the bossed drum (first embodiment) according to the present invention.
【図７】本発明に係るボス付きドラム（第１実施例）の
製造方法の第４説明図FIG. 7 is a fourth explanatory view of the method of manufacturing the bossed drum according to the present invention (first embodiment).
【図８】本発明に係るボス付きドラム（第１実施例）の
製造方法の第５説明図FIG. 8 is a fifth explanatory view of the method of manufacturing the bossed drum (first embodiment) according to the present invention.
【図９】本発明に係るボス付きドラム（第１実施例）の
製造方法の第６説明図FIG. 9 is a sixth explanatory view of the method for manufacturing the bossed drum (first embodiment) according to the present invention.
【図１０】本発明に係るボス付きドラム（第１実施例）
の製造方法の第７説明図FIG. 10 shows a bossed drum according to the present invention (first embodiment).
7th explanatory view of the manufacturing method
【図１１】本発明に係るボス付きドラム（第１実施例）
の製造方法の第８説明図FIG. 11 is a bossed drum according to the present invention (first embodiment).
8th explanatory view of the manufacturing method
【図１２】本発明に係るボス付きドラム（第１実施例）
の製造方法の第９説明図FIG. 12 is a bossed drum according to the present invention (first embodiment).
9th explanatory view of the manufacturing method
【図１３】本発明に係るボス付きドラム（第１実施例）
の製造方法の第１０説明図FIG. 13 is a bossed drum according to the present invention (first embodiment).
10th explanatory view of the manufacturing method of
【図１４】本発明に係るボス付きドラム（第２実施例）
の製造方法の第１説明図FIG. 14 is a bossed drum according to the present invention (second embodiment).
First explanatory view of the manufacturing method of
【図１５】本発明に係るボス付きドラム（第２実施例）
の製造方法の第２説明図FIG. 15 is a bossed drum according to the present invention (second embodiment).
2nd explanatory drawing of the manufacturing method of
【図１６】本発明に係るボス付きドラム（第２実施例）
の製造方法の第３説明図FIG. 16 shows a bossed drum according to the present invention (second embodiment).
3rd explanatory view of the manufacturing method
【図１７】本発明に係るボス付きドラム（第２実施例）
の製造方法の第４説明図FIG. 17 shows a drum with a boss according to the present invention (second embodiment).
4th explanatory view of the method of manufacturing
【図１８】本発明に係るボス付きドラム（第２実施例）
の製造方法の第５説明図FIG. 18 is a bossed drum according to the present invention (second embodiment).
5th explanatory view of the manufacturing method
【図１９】本発明に係るボス付きドラム（第２実施例）
の製造方法の第６説明図FIG. 19 is a bossed drum according to the present invention (second embodiment).
6th explanatory view of the manufacturing method
【図２０】本発明に係るボス付きドラム（第３実施例）
の製造方法の第１説明図FIG. 20 is a bossed drum according to the present invention (third embodiment).
First explanatory view of the manufacturing method of
【図２１】本発明に係るボス付きドラム（第３実施例）
の製造方法の第２説明図FIG. 21 is a bossed drum according to the present invention (third embodiment).
2nd explanatory drawing of the manufacturing method of
【図２２】本発明に係るボス付きドラム（第３実施例）
の製造方法の第３説明図FIG. 22 is a bossed drum according to the present invention (third embodiment).
3rd explanatory view of the manufacturing method
２…ボス付きドラム、４，９２，１０２…小径筒状ボ
ス、８…大径筒状ドラム、１２…底部、３０…平板（ワ
ーク）、３０ａ…孔、３２…有底筒状体、３２ａ…開
口、３５，６６，１００…小径筒部、３５ａ，６７，１
０１…肉厚減少部。2 ... Drum with boss, 4,92,102 ... Small diameter cylindrical boss, 8 ... Large diameter cylindrical drum, 12 ... Bottom part, 30 ... Plate (work), 30a ... Hole, 32 ... Bottomed cylindrical body, 32a ... Opening, 35, 66, 100 ... small-diameter cylindrical part, 35a, 67, 1
01 ... Thickness reduced portion.
Claims (4)
的に囲う大径筒状ドラムと、これらボスとドラムの一端
同士をつなぐ底部とからなるボス付きドラムの製造方法
であって、 予め中央に孔を開けた平板を絞ってドラム用の有底筒状
体を成形する工程と、この有底筒状体の中央部を逆絞り
して開口側に向って小径筒部を成形する工程と、この小
径筒部を増肉してボスにする工程とからなることを特徴
としたボス付きドラムの製造方法。1. A method of manufacturing a bossed drum comprising a central small-diameter cylindrical boss, a large-diameter cylindrical drum concentrically surrounding the boss, and a bottom connecting the boss and one end of the drum, A step of forming a cylindrical body with a bottom by squeezing a flat plate having a hole in the center in advance, and forming a small-diameter cylindrical part toward the opening side by reversely drawing the center of the cylindrical body with a bottom. A method of manufacturing a bossed drum, comprising: a step of increasing the thickness of the small-diameter cylindrical portion to form a boss.
は、小径筒部の先端の肉厚減少部を内側に折曲げて金型
で挟み、先端を除く小径筒部を縮径し且つ軸方向に潰す
ことにより増肉してボスにすることを特徴とした請求項
１記載のボス付きドラムの製造方法。2. The step of increasing the thickness of the small-diameter cylindrical portion to form a boss, wherein the reduced-thickness portion at the distal end of the small-diameter cylindrical portion is bent inward, sandwiched by a mold, and the small-diameter cylindrical portion excluding the distal end is reduced in diameter. 2. The method for manufacturing a bossed drum according to claim 1, wherein the boss is formed by increasing the wall thickness by crushing in the axial direction.
は、小径筒部の先端の肉厚減少部を軸方向に延ばし、先
端を含む小径筒部を縮径し且つ軸方向に潰すことにより
ボスをストレート状に成形することを特徴とした請求項
１記載のボス付きドラムの製造方法。3. The step of increasing the thickness of the small-diameter cylindrical portion to form a boss includes extending the reduced-thickness portion at the distal end of the small-diameter cylindrical portion in the axial direction, reducing the diameter of the small-diameter cylindrical portion including the distal end, and reducing the diameter in the axial direction. The method for manufacturing a bossed drum according to claim 1, wherein the boss is formed into a straight shape by crushing.
は、小径筒部を縮径し且つ軸方向に潰すことにより先端
の肉厚減少部を基端より小さく増肉して、ボスを基端側
から先端側に向けて小径となるテーパ状に成形すること
を特徴とした請求項１記載のボス付きドラムの製造方
法。4. The step of increasing the thickness of the small-diameter cylindrical portion to form a boss includes reducing the diameter of the small-diameter cylindrical portion and crushing the small-diameter cylindrical portion in the axial direction to increase the thickness of the thinned portion at the distal end to be smaller than the base end. 2. The method for manufacturing a bossed drum according to claim 1, wherein the boss is formed into a tapered shape having a smaller diameter from the base end side toward the tip end side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23149097A JP3364124B2 (en) | 1997-08-27 | 1997-08-27 | Manufacturing method of bossed drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23149097A JP3364124B2 (en) | 1997-08-27 | 1997-08-27 | Manufacturing method of bossed drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1157914A true JPH1157914A (en) | 1999-03-02 |
| JP3364124B2 JP3364124B2 (en) | 2003-01-08 |
Family
ID=16924316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23149097A Expired - Fee Related JP3364124B2 (en) | 1997-08-27 | 1997-08-27 | Manufacturing method of bossed drum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3364124B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003064073A1 (en) * | 2002-01-31 | 2003-08-07 | Kanemitsu Corporation | Method of forming spline and keyway for sheet metal rotating member with boss part |
| JP2006289374A (en) * | 2005-04-05 | 2006-10-26 | Toyota Motor Corp | Cold-forging method and raw material therefor |
| KR101111953B1 (en) | 2009-08-04 | 2012-02-13 | 부산대학교 산학협력단 | Method for manufacturing boss with integrated thickened wall and its molding apparatus |
| JP5697787B1 (en) * | 2014-05-19 | 2015-04-08 | 日新製鋼株式会社 | Molding material manufacturing method |
| WO2016158383A1 (en) * | 2015-03-31 | 2016-10-06 | 日新製鋼株式会社 | Manufacturing method of molding material |
-
1997
- 1997-08-27 JP JP23149097A patent/JP3364124B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003064073A1 (en) * | 2002-01-31 | 2003-08-07 | Kanemitsu Corporation | Method of forming spline and keyway for sheet metal rotating member with boss part |
| JP2003225728A (en) * | 2002-01-31 | 2003-08-12 | Kanemitsu:Kk | Method for forming spline and key groove of sheet metal rotary member having boss part |
| US7047787B2 (en) | 2002-01-31 | 2006-05-23 | Kanemitsu Corporation | Method of forming spline and keyway for sheet metal rotating member with boss part |
| JP2006289374A (en) * | 2005-04-05 | 2006-10-26 | Toyota Motor Corp | Cold-forging method and raw material therefor |
| KR101111953B1 (en) | 2009-08-04 | 2012-02-13 | 부산대학교 산학협력단 | Method for manufacturing boss with integrated thickened wall and its molding apparatus |
| WO2015177946A1 (en) * | 2014-05-19 | 2015-11-26 | 日新製鋼株式会社 | Method for manufacturing molded material |
| JP5697787B1 (en) * | 2014-05-19 | 2015-04-08 | 日新製鋼株式会社 | Molding material manufacturing method |
| EA027227B1 (en) * | 2014-05-19 | 2017-07-31 | Ниссин Стил Ко., Лтд. | Method for manufacturing molded material |
| TWI617372B (en) * | 2014-05-19 | 2018-03-11 | 日新製鋼股份有限公司 | Formed material manufacturing method |
| WO2016158383A1 (en) * | 2015-03-31 | 2016-10-06 | 日新製鋼株式会社 | Manufacturing method of molding material |
| TWI666072B (en) * | 2015-03-31 | 2019-07-21 | 日商日新製鋼股份有限公司 | Formed material manufacturing method |
| AU2016241822B2 (en) * | 2015-03-31 | 2020-01-02 | Nippon Steel Nisshin Co., Ltd. | Formed material manufacturing method |
| EA034335B1 (en) * | 2015-03-31 | 2020-01-29 | Ниппон Стил Ниссин Ко., Лтд. | Formed material manufacturing method |
| US11072013B2 (en) | 2015-03-31 | 2021-07-27 | Nisshin Steel Co., Ltd. | Formed material manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3364124B2 (en) | 2003-01-08 |
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