JP2000015387A - Formation of hollow ball stud - Google Patents

Formation of hollow ball stud

Info

Publication number
JP2000015387A
JP2000015387A JP10183595A JP18359598A JP2000015387A JP 2000015387 A JP2000015387 A JP 2000015387A JP 10183595 A JP10183595 A JP 10183595A JP 18359598 A JP18359598 A JP 18359598A JP 2000015387 A JP2000015387 A JP 2000015387A
Authority
JP
Japan
Prior art keywords
forming
ball stud
ball
outer diameter
ball head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10183595A
Other languages
Japanese (ja)
Other versions
JP3594485B2 (en
Inventor
Masuo Kawachi
益雄 河内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Musashi Seimitsu Industry Co Ltd
Original Assignee
Musashi Seimitsu Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Musashi Seimitsu Industry Co Ltd filed Critical Musashi Seimitsu Industry Co Ltd
Priority to JP18359598A priority Critical patent/JP3594485B2/en
Publication of JP2000015387A publication Critical patent/JP2000015387A/en
Application granted granted Critical
Publication of JP3594485B2 publication Critical patent/JP3594485B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a method for forming a hollow ball stud having high precision in a ball head part. SOLUTION: This forming method is composed of a pipe forming process for forming a cylindrical pipe material W3 having almost the same outer diameter as the outer diameter of the ball head part 8 in ball stud W5, a draw- forming process for forming shaft parts by contracting the diameters of the end parts in the pipe material W3 and also, forming a pre-projecting part 6 leaving the straight part 6a having the same outer diameter as the pipe material in the outer periphery at the center part in the axial direction in the unforming part and a finishing process for forming the pre-projecting part 6 to the spherical surface state by pressing the pre-projecting part 6.

Description

【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、略球状の球頭部と、球
頭部から突出する軸部とを有する中空ボールスタッドの
成形方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a hollow ball stud having a substantially spherical ball head and a shaft projecting from the ball head.

【0002】[0002]

【従来の技術】自動車の懸架装置等に使用されるボール
ジョイントは、図3に示す如き構成のものがある。この
ボールジョイント171は、両軸タイプのボールジョイ
ント171である。W105はボールスタッドで、球状
の球頭部108と、その球頭部108から同軸に突出す
る二本の軸部107,107からなり、このボールスタ
ッドW105は中空形状である。また、ボールスタッド
W105の球頭部108の外周側には合成樹脂製で円筒
状のベアリング73が配設され、ベアリング73の外周
側には金属製で円筒状のハウジング72が配設されてい
る。このハウジング72の端部内周には、直接又は間接
的にブーツ74,74の一端端部が装着され、ブーツ7
4,74の他端端部はボールスタッドW105の軸部1
09,109外周に装着されている。
2. Description of the Related Art A ball joint used for a suspension system of an automobile or the like has a structure as shown in FIG. The ball joint 171 is a double shaft type ball joint 171. W105 is a ball stud comprising a spherical ball head 108 and two shaft portions 107, 107 coaxially protruding from the ball head 108. The ball stud W105 has a hollow shape. A cylindrical bearing 73 made of synthetic resin is provided on the outer peripheral side of the ball head 108 of the ball stud W105, and a metallic cylindrical housing 72 is provided on the outer peripheral side of the bearing 73. . One end of the boot 74 is directly or indirectly attached to the inner periphery of the end of the housing 72.
The other end of the shaft 4, 74 is the shaft 1 of the ball stud W105.
09, 109 are mounted on the outer periphery.

【0003】上記ボールジョイント171に使用される
ボールスタッドW105の成形方法を図6乃至図8に基
づいて説明する。
A method of forming the ball stud W105 used for the ball joint 171 will be described with reference to FIGS.

【0004】図6は素材W100からボールスタッドW
105を成形する成形工程を表す。まず、鋼製線材を軸
線垂直方向に切断して、円筒状の素材W100(図6の
(ア)) を形成する。次に、素材W100の一端端部
に若干凹んだ凹部102aを成形した予備材W101
(図6の(イ)) を形成し、続いて、凹部102aを
更に他端端部に延ばし予備穴103を成形することによ
り、他端端部に底部104を成形した片開口材W102
(図6の(ウ)) を形成する。その後、底部104を
打ち抜いて貫通孔105を成形した円筒状のパイプ材W
103(図6の(エ))を形成し、続いてパイプ材W1
03の軸線方向中央部を外周側に膨出させて、球状の球
頭部108とその球頭部108から同軸に突出する軸部
107,107からなる中間材W104(図6の
(オ)) を形成し、最後に球頭部108に転造加工を
施し、ボールスタッドW105(図6の(カ))を形成
していた。
[0004] FIG. 6 shows a ball stud W from a material W100.
105 shows a molding step for molding 105. First, a steel wire rod is cut in the direction perpendicular to the axis line to form a cylindrical raw material W100 (FIG. 6A). Next, a spare material W101 in which a concave portion 102a slightly recessed is formed at one end of the material W100.
(FIG. 6 (a)) is formed, and then the concave portion 102a is further extended to the other end portion to form a preliminary hole 103, thereby forming the one-side opening material W102 having the bottom portion 104 formed at the other end portion.
((C) in FIG. 6) is formed. Thereafter, a cylindrical pipe material W having a through hole 105 formed by punching the bottom portion 104 is formed.
103 (FIG. 6D), followed by the pipe material W1.
The intermediate member W104 (FIG. 6E) comprising a spherical ball head 108 and shafts 107, 107 protruding coaxially from the spherical head 108 by bulging the central portion in the axial direction of 03 toward the outer peripheral side. And finally, the ball head 108 is subjected to a rolling process to form a ball stud W105 ((f) in FIG. 6).

【0005】このボールスタッドW105の成形工程の
中で、特にパイプ材W103から中間材W104を形成
する工程を図7及び図8に基づいて説明する。
[0005] In the process of forming the ball stud W105, a process of forming an intermediate material W104 from a pipe material W103 will be described with reference to FIGS.

【0006】図7は鍛造成形前、図8は鍛造成形後の状
態を表す。まず図7により鍛造装置110の構成を説明
する。この鍛造装置110は、上部にボールスタッドW
105の球頭部108と同一曲率で略下半球状の静型彫
空間134を有し、静型彫空間134対して前後摺動可
能なノックアウトリング135とノックアウトリング1
35の内周に配置された静固定ピン137とを備えた静
金型131と、下部にボールスタッドW105の球頭部
108と同一曲率で略上半球状の動型彫空間114を有
し、動型彫空間114に対して前後摺動可能なリングパ
ンチ115とリングパンチ115の内周に配置された動
固定ピン117とを備えた動金型111とからなる。こ
こで静金型131は、ノックアウトリング135が下方
へ退避した状態で静型彫空間134に連続して下軸保持
空間134aが形成される。また動金型111は、リン
グパンチ115が上方へ退避した状態で動型彫空間11
4に連続して上軸保持空間114aが形成される。
FIG. 7 shows a state before forging, and FIG. 8 shows a state after forging. First, the configuration of the forging device 110 will be described with reference to FIG. This forging device 110 has a ball stud W
A knock-out ring 135 and a knock-out ring 1 which have a substantially lower hemispherical static engraving space 134 with the same curvature as the ball head 108 of 105 and can slide back and forth with respect to the static engraving space 134
A static mold 131 having a static fixing pin 137 arranged on the inner circumference of the ball 35, and a dynamic engraving space 114 having a substantially upper hemispherical shape with the same curvature as the ball head 108 of the ball stud W105 at the lower part; It comprises a moving die 111 having a ring punch 115 slidable back and forth with respect to the moving engraving space 114 and a moving fixing pin 117 arranged on the inner periphery of the ring punch 115. Here, in the static mold 131, a lower shaft holding space 134a is formed continuously with the static engraving space 134 with the knockout ring 135 retracted downward. In addition, the moving mold 111 holds the moving mold engraving space 11 with the ring punch 115 retracted upward.
4, the upper shaft holding space 114a is formed.

【0007】この鍛造装置110で鍛造成形する場合、
予め円筒状に成形されたパイプ材W103を静型彫空間
134の下軸保持空間134aに投入し、ノックアウト
リング135の上面で支持する。続いて、動金型111
を前進させリングパンチ115をパイプ材W103に当
接させると共に、動金型111を前進させリングパンチ
115を動金型111内部に収容する。その後、更に動
金型111は前進しパイプ材W103を上軸保持空間1
14aに嵌合させるとともに、リングパンチ115がパ
イプ材W103に荷重をかけ、図8に示す如くパイプ材
W103の軸線方向中央付近を型彫空間114,134
に沿って外周側に膨出させて中間材W104を形成して
いた。
In the case of forging with this forging device 110,
The pipe W103 previously formed into a cylindrical shape is put into the lower shaft holding space 134a of the static engraving space 134, and is supported on the upper surface of the knockout ring 135. Subsequently, the moving mold 111
Is moved forward to bring the ring punch 115 into contact with the pipe material W103, and the moving die 111 is moved forward to accommodate the ring punch 115 inside the moving die 111. Thereafter, the moving die 111 further moves forward and moves the pipe member W103 to the upper shaft holding space 1.
At the same time, the ring punch 115 applies a load to the pipe material W103, and as shown in FIG.
Along the outer periphery to form the intermediate material W104.

【0008】[0008]

【発明が解決しようとする課題】上述の如く予め円筒状
のパイプ材W103を形成後、軸線方向中央付近を外周
側に膨出させて中間材W104を形成すると、図9に示
す如く外周側に膨出するとともに、更に内周側にも余肉
199が張出すことがある。この場合、内周側に張出し
た余肉199量だけ外周側の膨出が減り球頭部108外
周に欠肉が発生する。そのためその後の転造加工で球頭
部108を修正できず、球頭部108の精度が低下する
ということがある。
After the cylindrical pipe member W103 is formed in advance as described above, the intermediate member W104 is formed by expanding the vicinity of the center in the axial direction to the outer peripheral side to form the intermediate member W104 as shown in FIG. While bulging, the excess thickness 199 may also protrude to the inner peripheral side. In this case, the bulge on the outer peripheral side is reduced by the amount of the extra thickness 199 that protrudes toward the inner peripheral side, and the underfill is generated on the outer periphery of the ball head 108. Therefore, the ball head 108 cannot be corrected by the subsequent rolling process, and the accuracy of the ball head 108 may be reduced.

【0009】従って、本発明は上述の如き課題を解決
し、球頭部の精度の高い中空ボールスタッドを成形する
方法を提供することを目的とする。
Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a method of forming a hollow ball stud with a high precision of a ball head.

【0010】[0010]

【課題を解決するための手段】本発明は以下のとおりで
ある。
The present invention is as follows.

【0011】所望するボールスタッドの球頭部外径と略
同一外径で円筒状のパイプ材を形成するパイプ成形工程
と、パイプ材の端部を縮径して軸部を成形するとともに
未成形部分の軸方向中央外周にパイプ材と同一外径のス
トレート部を残した予備凸部を成形するしぼり成形工程
と、予備凸部を押圧し、予備凸部を球面状に成形する仕
上げ工程とからなる。
A pipe forming step of forming a cylindrical pipe having substantially the same outer diameter as the outer diameter of the ball head of the desired ball stud; forming a shaft by reducing the diameter of the end of the pipe; From the squeezing forming step of forming a preliminary convex part leaving a straight part having the same outer diameter as the pipe material on the axial center outer periphery of the part, and the finishing step of pressing the preliminary convex part and molding the preliminary convex part into a spherical shape Become.

【0012】[0012]

【実施例】以下、本発明の実施例を図1乃至図5に基づ
いて説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

【0013】図3は本発明の実施例により成形されたボ
ールスタッドW5を使用したボールジョイント71を表
す。ボールスタッドW5は、球状の球頭部8とその球頭
部8から同軸に突出する二本の軸部7,7を有する中空
形状で金属製である。73は合成樹脂製で円筒状のベア
リングで、ボールスタッドW5の球頭部8の外周側に配
設されている。ベアリング73はボールスタッドW5の
軸部7, 7を突出させるための開口を両端に備えてお
り、内側にボールスタッドW5の球頭部8と略同一曲率
の内球面73aを有すると共にボールスタッドW5の球
頭部8を揺動回動自在に保持する。72は略円筒状で両
端に開口を有するハウジングで、一端端部の内周側には
略円筒状で内側に延びるフランジ形状を有する抜け止め
リング75が固定され、ベアリング73の軸線方向への
移動が規制されている。74はゴム弾性体製の略円筒状
のブーツで、両端が開口され、大開口部に断面L字で金
属製の環状のカラー76が埋設されている。このブーツ
74,74は抜け止めリング75の内周とボールスタッ
ドW5の一方軸部9の外周との間と、ハウジング72の
一端端部内周とボールスタッドW5の他方軸部9の外周
との間に夫々配設されている。
FIG. 3 shows a ball joint 71 using a ball stud W5 formed according to an embodiment of the present invention. The ball stud W5 is a hollow metal having a spherical ball head 8 and two shaft portions 7, 7 projecting coaxially from the ball head 8. Reference numeral 73 denotes a cylindrical bearing made of synthetic resin, which is provided on the outer peripheral side of the ball head 8 of the ball stud W5. The bearing 73 has openings at both ends for projecting the shaft portions 7, 7 of the ball stud W5. The bearing 73 has an inner spherical surface 73a having substantially the same curvature as the ball head 8 of the ball stud W5 on the inner side. The ball head 8 is swingably held. Reference numeral 72 denotes a substantially cylindrical housing having openings at both ends. A retaining ring 75 having a substantially cylindrical, inwardly extending flange shape is fixed to the inner peripheral side of one end, and the bearing 73 moves in the axial direction. Is regulated. Reference numeral 74 denotes a substantially cylindrical boot made of a rubber elastic body, both ends of which are opened, and a metal annular collar 76 having an L-shaped cross section is embedded in the large opening. The boots 74, 74 are located between the inner periphery of the retaining ring 75 and the outer periphery of the one shaft 9 of the ball stud W5, and between the inner periphery of one end of the housing 72 and the outer periphery of the other shaft 9 of the ball stud W5. Are arranged respectively.

【0014】上記ボールジョイント71に使用されるボ
ールスタッドW5の成形工程を図1に基づいて説明す
る。
The process of forming the ball stud W5 used for the ball joint 71 will be described with reference to FIG.

【0015】図1は素材W0からボールスタッドW5を
成形する成形工程を表す。まず、所望するボールスタッ
ドW5の球頭部8外径と略同一外径の鋼製線材を軸線垂
直方向に切断して、円柱状の素材W0(図1の(ア))
を形成し、続いて、素材W0の一端に若干凹んだ凹部
2aを成形した予備材W1(図1の(イ)) を形成す
る。次に、予備材W1の一端凹部2aを他端端部側に延
ばし予備穴3を成形するとともに他端に凹部2bを成形
した底部4を有するカップ状の片開口材W2(図1の
(ウ)) を形成後、片開口材W2の底部4を図示せぬ
パンチにより打ち抜いて、所望するボールスタッドW5
の球頭部8外径D3と略同一外径D1で円筒状のパイプ
材W3(図1の(エ)) を形成する。その後、パイプ
材W3の両端を縮径して軸部7, 7を成形するととも
に、未成形部分の中央付近をストレート部6aとして残
し、ストレート部6aと軸部7とをつなぐ連接部6bを
円弧形状に成形する中間材W4(図1の(オ)) を形
成する。
FIG. 1 shows a forming step of forming a ball stud W5 from a raw material W0. First, a steel wire rod having substantially the same outer diameter as the outer diameter of the ball head 8 of the desired ball stud W5 is cut in the direction perpendicular to the axis to obtain a cylindrical raw material W0 ((A) in FIG. 1).
Then, a spare material W1 (FIG. 1A) in which a slightly recessed recess 2a is formed at one end of the material W0 is formed. Next, the one-side recessed portion 2a of the spare member W1 is extended toward the other end portion side to form the spare hole 3 and the cup-shaped single-opening member W2 (FIG. )) Is formed, the bottom 4 of the one-side opening material W2 is punched out by a punch (not shown), and a desired ball stud W5 is formed.
A cylindrical pipe member W3 ((D) in FIG. 1) having an outer diameter D1 substantially the same as the outer diameter D3 of the spherical head 8 is formed. Thereafter, the diameters of both ends of the pipe member W3 are reduced to form the shaft portions 7, 7, and the vicinity of the center of the unformed portion is left as a straight portion 6a, and the connecting portion 6b connecting the straight portion 6a and the shaft portion 7 is formed into an arc. An intermediate material W4 ((e) in FIG. 1) to be formed into a shape is formed.

【0016】ここで、このパイプW3から中間材W4を
形成する工程を図4及び図5に基づいて説明する。
Here, the process of forming the intermediate material W4 from the pipe W3 will be described with reference to FIGS.

【0017】図4は鍛造成形前、図5は鍛造成形後の状
態を表す。まず図4により鍛造装置10の構成を説明す
る。この鍛造装置10は、固定された静金型31と、静
金型31に対して進退可能に設けられた動金型11とか
らなる。
FIG. 4 shows a state before forging, and FIG. 5 shows a state after forging. First, the configuration of the forging device 10 will be described with reference to FIG. The forging device 10 includes a stationary metal mold 31 fixed and a moving metal mold 11 provided to be able to advance and retreat with respect to the static metal mold 31.

【0018】静金型31は、上部にパイプ材W3の外径
と略同径の下案内部42と、下案内部42に連続しボー
ルスタッドW5の球頭部8の曲率より大きい曲率の円弧
状で下方に向かって漸次小径となる下しぼり部43が形
成され、下案内部42と下しぼり部43により静型彫空
間34が画成されるダイ32を備える。また、静型彫空
間34に連続し、ボールスタッドW5の軸部7外径と同
径の下軸保持空間34aが形成され、連続的にノックア
ウト孔33を形成する。ノックアウト孔33内には、静
型彫空間34に対して前後摺動可能なノックアウトリン
グ35とカラー36とが配設され、その内周に静ピンガ
イド38で固定される静固定ピン37が挿嵌されてい
る。更に静ピンガイド38は、ノックアウト孔33を塞
ぐ静カバー39にボルト40で一体に固定され、この固
定される静ピンガイド38と静カバー39にはその内部
を貫通しカラー36に当接する静支持ピン41が挿嵌さ
れる。
The static mold 31 has a lower guide portion 42 having a diameter substantially the same as the outer diameter of the pipe member W3 at the upper portion thereof, and a circle having a curvature larger than the curvature of the ball head 8 of the ball stud W5 continuing to the lower guide portion 42. A lower portion 43 having an arc shape and gradually decreasing downward is formed. The lower guide portion 42 and the lower portion 43 define the die 32 in which the static engraving space 34 is defined. Further, a lower shaft holding space 34a having the same diameter as the outer diameter of the shaft portion 7 of the ball stud W5 is formed continuously with the static engraving space 34, and the knockout hole 33 is continuously formed. In the knockout hole 33, a knockout ring 35 and a collar 36 which are slidable back and forth with respect to the static engraving space 34 are disposed, and a static fixing pin 37 fixed by a static pin guide 38 is inserted in the inner periphery thereof. It is fitted. Further, the static pin guide 38 is integrally fixed to a static cover 39 closing the knockout hole 33 with bolts 40, and the static pin guide 38 and the static cover 39 which are fixed penetrate the inside thereof and abut against the collar 36. The pin 41 is inserted.

【0019】また動金型11は、下部にパイプ材W3の
外径と略同径の上案内部22と、上案内部22に連続し
ボールスタッドW5の球頭部8の曲率より大きい曲率の
円弧状で上方に向かって漸次小径となる上しぼり部23
が形成され、上案内部22と上しぼり部23により静型
彫空間14が画成されるパンチガイド12を備える。パ
ンチガイド12には動型彫空間14に連続して内部を軸
方向に貫通するパンチ孔13が設けられている。パンチ
孔13内には、動型彫空間14に対して前後摺動可能な
リングパンチ15とカラー16とが配設され、その内周
に動ピンガイド18で固定される動固定ピン17が挿嵌
されている。更に動ピンガイド18は、パンチ孔13を
塞ぐ動カバー19にボルト20で一体に固定され、この
固定される動ピンガイド18と動カバー19にはその内
部を貫通しカラー16に当接する動支持ピン21が挿嵌
される。尚,リングパンチ15は成形前の状態でパンチ
ガイド12の端面より突出しており、このリングパンチ
15に追従してカラー16と動ピンガイド18も動型彫
空間14側に移動している。
The moving die 11 has an upper guide portion 22 having a diameter substantially equal to the outer diameter of the pipe member W3 at a lower portion, and a curvature larger than the curvature of the ball head 8 of the ball stud W5 connected to the upper guide portion 22. Upper squeezing portion 23 having an arc shape and gradually decreasing in diameter upward.
And a punch guide 12 in which a static engraving space 14 is defined by an upper guide portion 22 and an upper squeezing portion 23. The punch guide 12 is provided with a punch hole 13 penetrating in the axial direction through the inside of the dynamic engraving space 14. A ring punch 15 and a collar 16 slidable back and forth with respect to the dynamic engraving space 14 are provided in the punch hole 13, and a dynamic fixing pin 17 fixed by a dynamic pin guide 18 is inserted in the inner periphery thereof. It is fitted. Further, the moving pin guide 18 is integrally fixed to a moving cover 19 that closes the punch hole 13 with bolts 20, and the fixed moving pin guide 18 and the moving cover 19 penetrate through the inside thereof and contact with the collar 16. The pin 21 is inserted. The ring punch 15 protrudes from the end face of the punch guide 12 before molding, and the collar 16 and the moving pin guide 18 also move toward the moving engraving space 14 following the ring punch 15.

【0020】上記鍛造装置10で鍛造成形する場合、ま
ずパイプ材W3を静金型31の下案内部42から静型彫
空間34に投入する。続いて、動金型11を前進させリ
ングパンチ15をパイプ材W3に当接させるとともに、
動金型11を前進させリングパンチ15を動金型11内
部に収容する。そしてパイプ材W3の上端が動金型11
の上案内部22挿入後、下しぼり部43及び上しぼり部
23に沿ってしぼり加工が施され、図5に示す如く、下
軸保持空間34a及び上軸保持空間14aに軸部7, 7
が形成されるとともに軸方向中央外周にストレート部6
a、そしてストレート部6aと軸部をつなぐ円弧形状の
連接部6bからなる予備凸部6が成形され、中間材W4
を形成する。その後、動金型11が退避するとともに、
静支持ピン41によりノックアウトリング35が静型彫
空間34側に突出され中間材W4が静金型31から取り
出され、本工程による成形が完了する。
In the case of forging with the forging device 10, first, the pipe material W3 is put into the static engraving space 34 from the lower guide portion 42 of the static mold 31. Subsequently, the moving die 11 is advanced to bring the ring punch 15 into contact with the pipe material W3,
The moving die 11 is advanced and the ring punch 15 is accommodated inside the moving die 11. And the upper end of the pipe material W3 is
After the upper guide portion 22 is inserted, squeezing is performed along the lower squeezed portion 43 and the upper squeezed portion 23, and as shown in FIG. 5, the shaft portions 7, 7 are inserted into the lower shaft holding space 34a and the upper shaft holding space 14a.
Is formed and a straight portion 6
a, and a preliminary convex portion 6 comprising an arc-shaped connecting portion 6b connecting the straight portion 6a and the shaft portion is formed, and the intermediate material W4 is formed.
To form Then, while the dynamic mold 11 is retracted,
The knockout ring 35 protrudes toward the static engraving space 34 by the static support pin 41, the intermediate member W4 is taken out of the static mold 31, and the molding in this step is completed.

【0021】そして最後に、図1に示す如く、中間材W
4のストレート部6aと連接部6bとからなる予備凸部
6を球面上に仕上げ、ボールスタッドW5(図1の
(カ))を形成する。
Finally, as shown in FIG.
4 is finished on a spherical surface to form a ball stud W5 ((f) in FIG. 1).

【0022】よって、しぼり加工で軸部7を成形するた
め、中間材W4の予備凸部6に欠肉が発生しない。更に
パイプ材W3からストレート部6aと連接部6bとから
なる予備凸部6を一旦成形後、更に図2に示す如く、球
頭部8を成形するため、無理なく球面状に成形できる。
ここで、中間材W4の予備凸部6の体積を、ボールスタ
ッドW5の球頭部8の体積と略同一に成形すると、仕上
げ成形がより容易となる。
Therefore, since the shaft portion 7 is formed by squeezing, the pre-projection 6 of the intermediate material W4 does not have any underfill. Further, after the preliminary convex portion 6 including the straight portion 6a and the connecting portion 6b is once formed from the pipe material W3, and further the ball head 8 is formed as shown in FIG. 2, the spherical portion can be formed without difficulty.
Here, when the volume of the preliminary projection 6 of the intermediate material W4 is formed to be substantially the same as the volume of the ball head 8 of the ball stud W5, the finish forming becomes easier.

【0023】尚、上記実施例では両軸タイプのボールス
タッドW5を例に取り成形方法を説明したが、本発明は
このような両軸タイプのボールスタッドW5に限定され
るものではなく、片軸タイプのボールスタッドでも良
い。
In the above embodiment, the molding method has been described taking the double-shaft type ball stud W5 as an example. However, the present invention is not limited to such a double-shaft type ball stud W5. A ball stud of type may be used.

【0024】[0024]

【発明の効果】以上のように本発明によれば、所望する
ボールスタッドの球頭部外径と略同一外径で円筒状のパ
イプ材を形成するパイプ成形工程と、パイプ材の端部を
縮径して軸部を成形するとともに未成形部分の軸方向中
央外周にパイプ材と同一外径のストレート部を残した予
備凸部を成形するしぼり成形工程と、予備凸部を押圧
し、予備凸部を球面状に成形する仕上げ工程とからなる
ため、予備凸部に欠肉が発生せず容易に仕上げることが
できるとともに無理なく球面状に成形できるので、ボー
ルスタッドの球頭部を高い精度で成形することが可能と
なる。
As described above, according to the present invention, a pipe forming step of forming a cylindrical pipe material having substantially the same outer diameter as the ball head outer diameter of a desired ball stud, and forming an end portion of the pipe material. The squeeze forming step of reducing the diameter to form the shaft portion and forming a preliminary convex portion leaving a straight portion having the same outer diameter as the pipe material at the axial center outer periphery of the unformed portion, and pressing the preliminary convex portion, Since the finishing process consists of forming the convex portion into a spherical shape, the preliminary convex portion can be easily finished without underfilling and can be easily formed into a spherical shape, so that the ball head of the ball stud has high precision. It is possible to mold with.

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

【図1】本発明の実施例によるボールスタッドの成形工
程を表す断面平面図である。
FIG. 1 is a cross-sectional plan view illustrating a forming process of a ball stud according to an embodiment of the present invention.

【図2】図1のA部の状態を説明するA部拡大図であ
る。
FIG. 2 is an enlarged view of a part A illustrating a state of a part A of FIG. 1;

【図3】本発明の実施例による成形方法により成形され
たボールスタッドを使用するボールジョイントの断面平
面図である。
FIG. 3 is a cross-sectional plan view of a ball joint using a ball stud formed by a forming method according to an embodiment of the present invention.

【図4】本発明の実施例によるパイプ材から中間材を成
形する前の状態を表す断面平面図である。
FIG. 4 is a cross-sectional plan view illustrating a state before an intermediate member is formed from a pipe member according to an embodiment of the present invention.

【図5】本発明の実施例によるパイプ材から中間材を成
形した後の状態を表す断面平面図である。
FIG. 5 is a cross-sectional plan view illustrating a state after an intermediate member is formed from a pipe member according to an embodiment of the present invention.

【図6】従来のボールスタッドの成形工程を表す断面平
面図である。
FIG. 6 is a cross-sectional plan view illustrating a step of forming a conventional ball stud.

【図7】従来の中間材からボールスタッドを成形する前
の状態を表す断面平面図である。
FIG. 7 is a sectional plan view showing a state before a ball stud is formed from a conventional intermediate material.

【図8】従来の中間材からボールスタッドを成形した後
の状態を表す断面平面図である。
FIG. 8 is a sectional plan view showing a state after a ball stud is formed from a conventional intermediate material.

【図9】図8の要部拡大図である。FIG. 9 is an enlarged view of a main part of FIG. 8;

【符号の説明】[Explanation of symbols]

5 貫通孔 6 予備凸部 6a ストレート部 6b 連接部 7 軸部 8 球頭部 W3 パイプ材 W5 ボールスタッド D1 パイプ材の外径 D2 中間材のストレート部外径 D3 ボールスタッドの球頭部外径 5 Through Hole 6 Preliminary Convex Portion 6a Straight Portion 6b Connecting Portion 7 Shaft Portion 8 Ball Head W3 Pipe Material W5 Ball Stud D1 Outer Diameter of Pipe Material D2 Outer Diameter of Straight Portion of Intermediate Material D3 Outer Diameter of Ball Head of Ball Stud

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 略球状の球頭部(8)と該球頭部(8)
から突出する軸部(7)とを有し、軸方向に貫通する貫
通孔(5)を設けた中空ボールスタッドの成形方法にお
いて、所望するボールスタッド(W5)の球頭部(8)
外径(D3)と略同一外径(D1)で円筒状のパイプ材
(W3)を成形するパイプ成形工程と、パイプ材(W
3)の端部を縮径して軸部(7)を成形するとともに未
成形部分の軸方向中央外周にパイプ材(W3)と同一外
径(D2)のストレート部(6a)を残した予備凸部
(6)を成形するしぼり成形工程と、予備凸部(6)を
押圧し、予備凸部(6)を球面状に成形する仕上げ工程
とからなることを特徴とする中空ボールスタッドの成形
方法。
1. A substantially spherical ball head (8) and said ball head (8)
A ball head (8) of a desired ball stud (W5) in a method of forming a hollow ball stud having a shaft portion (7) protruding from the hole and having a through hole (5) penetrating in the axial direction.
A pipe forming step of forming a cylindrical pipe material (W3) having an outer diameter (D1) substantially equal to the outer diameter (D3);
The shaft portion (7) is formed by reducing the diameter of the end portion of (3), and the straight portion (6a) having the same outer diameter (D2) as the pipe material (W3) is left around the center of the unformed portion in the axial direction. A hollow ball stud forming method comprising: a squeezing forming step of forming the convex portion (6); and a finishing step of pressing the preliminary convex portion (6) and forming the preliminary convex portion (6) into a spherical shape. Method.
【請求項2】 前記予備凸部(6)の体積を、前記ボー
ルスタッド(W5)の球頭部(8)の体積と略同一に成
形することを特徴とする請求項1記載の中空ボールスタ
ッドの成形方法。
2. The hollow ball stud according to claim 1, wherein the volume of the preliminary projection is substantially equal to the volume of the ball head of the ball stud. Molding method.
JP18359598A 1998-06-30 1998-06-30 Molding method of hollow ball stud Expired - Fee Related JP3594485B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18359598A JP3594485B2 (en) 1998-06-30 1998-06-30 Molding method of hollow ball stud

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18359598A JP3594485B2 (en) 1998-06-30 1998-06-30 Molding method of hollow ball stud

Publications (2)

Publication Number Publication Date
JP2000015387A true JP2000015387A (en) 2000-01-18
JP3594485B2 JP3594485B2 (en) 2004-12-02

Family

ID=16138577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18359598A Expired - Fee Related JP3594485B2 (en) 1998-06-30 1998-06-30 Molding method of hollow ball stud

Country Status (1)

Country Link
JP (1) JP3594485B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006220233A (en) * 2005-02-10 2006-08-24 Hitachi Ltd Installation ring and its manufacturing method
CN102773398A (en) * 2011-05-09 2012-11-14 上海重型机器厂有限公司 Method for forging slender and thick-walled pipe fittings
CN106475505A (en) * 2015-08-25 2017-03-08 上海精拓模具制造有限公司 A kind of one-shot forming technique of the outer round belt groove product of employing Huff die cold-heading

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006220233A (en) * 2005-02-10 2006-08-24 Hitachi Ltd Installation ring and its manufacturing method
JP4711048B2 (en) * 2005-02-10 2011-06-29 日立オートモティブシステムズ株式会社 Mounting ring manufacturing method
CN102773398A (en) * 2011-05-09 2012-11-14 上海重型机器厂有限公司 Method for forging slender and thick-walled pipe fittings
CN106475505A (en) * 2015-08-25 2017-03-08 上海精拓模具制造有限公司 A kind of one-shot forming technique of the outer round belt groove product of employing Huff die cold-heading

Also Published As

Publication number Publication date
JP3594485B2 (en) 2004-12-02

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