JPS6138733A - Production of ball stud - Google Patents
Production of ball studInfo
- Publication number
- JPS6138733A JPS6138733A JP16084984A JP16084984A JPS6138733A JP S6138733 A JPS6138733 A JP S6138733A JP 16084984 A JP16084984 A JP 16084984A JP 16084984 A JP16084984 A JP 16084984A JP S6138733 A JPS6138733 A JP S6138733A
- Authority
- JP
- Japan
- Prior art keywords
- ball stud
- head
- diameter
- globular
- shaft
- 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)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、自動車等の車両のジヨイント部に使用される
ボールスタッドの製造方法、特に冷間鍛造による製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a ball stud used in a joint portion of a vehicle such as an automobile, and particularly to a method of manufacturing it by cold forging.
（従来技術）
従来、ボールスタッドを冷間鍛造により製造する方法と
しては、例えば第２図に示すように、以下の工程から成
る方法がある。(Prior Art) Conventionally, as a method of manufacturing a ball stud by cold forging, there is a method consisting of the following steps, as shown in FIG. 2, for example.
（１）製造すべきボールスタッドの軸部４の直径とほぼ
同一の外径を有する円柱形材料を切断することにより、
ボールスタッドの全体積とほぼ同一の体積を有する素材
１を形成する（第２図（Ａ））。(1) By cutting a cylindrical material having an outer diameter approximately the same as the diameter of the shaft portion 4 of the ball stud to be manufactured,
A material 1 having a volume almost the same as the total volume of the ball stud is formed (FIG. 2(A)).
（２）前方押出成形によりネジ部２、テーパ部３および
軸部４を順次形成する（同図（Ｂ）および（ｃ）、）。(2) Threaded portion 2, tapered portion 3, and shaft portion 4 are sequentially formed by forward extrusion molding ((B) and (c) in the same figure).
（３）頭部５を含む各部を予備成形する（同図（Ｄ））
。(3) Preform each part including the head 5 ((D) in the same figure)
.
（４）軸部４以下をダイ６に固定して上方からパンチ７
で押圧することにより、パンチ７とダイ６の間で頭部５
の中間部を突出させて突条部（パリ）５ａを形成し、頭
部５を球状に成形する（同図（Ｅ））。この場合、頭部
５の頂上に位置するパンチ７の中心部は開放されて、開
口８となっている。(4) Fix the shaft part 4 and below to the die 6 and punch 7 from above.
By pressing with the head 5 between the punch 7 and the die 6
The middle part of the head 5 is formed into a spherical shape by protruding the middle part of the head 5 (Fig. In this case, the center of the punch 7 located at the top of the head 5 is opened to form an opening 8.
（発明が解決しようとする問題点）
しかしながら、上記の冷間鍛造方法においては、素材１
の外径が製造すべきポールスタッドの軸部の径とほぼ同
一であるため、頭部５を球状に成形する時には、上記の
ようにパンチ７とダイ６の間に挟まれた頭部５の中央に
全周にわたって突条部５ａを突出させることにより、所
定の直径の球形を得るようにしている。そのため、大き
な成形荷重を必要とする一方、パンチ７の下端面がダイ
６の上端面に当接しないから、成形荷重を一定にするこ
とが困難で、歩留りが悪く、鍛造型の寿命も低下する。(Problem to be solved by the invention) However, in the above cold forging method, the material 1
Since the outer diameter of the head 5 is almost the same as the diameter of the shaft of the pole stud to be manufactured, when forming the head 5 into a spherical shape, the outer diameter of the head 5 sandwiched between the punch 7 and the die 6 is A spherical shape with a predetermined diameter is obtained by protruding the protrusion 5a from the center over the entire circumference. Therefore, while a large forming load is required, since the lower end surface of the punch 7 does not come into contact with the upper end surface of the die 6, it is difficult to keep the forming load constant, resulting in poor yield and shortened lifespan of the forging die. .
また、最後に突条部５ａを除去するため機械加工等の後
処理を必要とし、その分材料も無駄になるという問題が
あった。Further, in order to finally remove the protruding stripes 5a, post-processing such as machining is required, and there is a problem in that material is wasted accordingly.
（問題点を解決するための手段）
本発明は、このような従来の問題点に鑑みてなされたも
ので、特に頭部を成形する時に突条部を突出させること
なく球形に鍛造することにより、成形荷重が一定で歩留
りの良い、下記の工程から成るボールスタッドの製造方
法を提供することを目的とする。(Means for Solving the Problems) The present invention has been made in view of such conventional problems, and in particular, by forging the head into a spherical shape without protruding the protrusions when forming the head. It is an object of the present invention to provide a method for manufacturing a ball stud, which has a constant molding load and a high yield, and which consists of the following steps.
すなわち、本発明は冷間鍛造によりボールスタッドを製
造する方法であって、製造すべきボールスタッドの軸部
の直径と球部の直径との間の外径を有する円柱形材料を
切断することにより、該ボールスタッドの全体積とほぼ
同一の体積を有する素材を形成し、前方押出成形により
素材にネジ部、テーパ部および軸部を形成後、素材の頭
部の中間部を円柱形とし、その上部および下部を互いに
対称な円錐台形状に予備成形し、しかる後、頭部を閉塞
鍛造により球形に成形するようにしたものである。That is, the present invention is a method of manufacturing a ball stud by cold forging, which involves cutting a cylindrical material having an outer diameter between the diameter of the shaft and the diameter of the ball of the ball stud to be manufactured. , a material having a volume almost the same as the total volume of the ball stud is formed, and after forming a threaded part, a tapered part, and a shaft part in the material by forward extrusion molding, the middle part of the head of the material is made into a cylindrical shape; The upper and lower parts are preformed into symmetrical truncated conical shapes, and then the head is formed into a spherical shape by closed forging.
（実施例）
第１図は、本発明によるボールスタッドの製造方法を示
す図である。この冷間鍛造による製造方法は、以下の工
程から成る。(Example) FIG. 1 is a diagram showing a method of manufacturing a ball stud according to the present invention. This manufacturing method by cold forging consists of the following steps.
（１）製造すべきボールスタッドの軸部１４の直径ｄ２
と球部１５の直径りとの間の外径ｄ１を有する円柱形材
料を切断することにより、該ボールスタッドの全体積と
ほぼ同一の体積を有する素材１１を形成する （第１図
（Ａ））。例えば、素材１１の外径ｄ１は、球部の直径
りに対しくＤ／ｄｉ）”＝ １．８〜２．３すなわち
ｄｌ＝ ０．８ＥｆＤ〜０．７５０となるようにする。(1) Diameter d2 of shaft portion 14 of ball stud to be manufactured
By cutting a cylindrical material having an outer diameter d1 between and the diameter of the ball stud 15, a material 11 having a volume approximately equal to the total volume of the ball stud is formed (FIG. 1(A)) ). For example, the outer diameter d1 of the material 11 is set so that the diameter of the spherical portion is D/di)''=1.8 to 2.3, that is, dl=0.8EfD to 0.750.
（２）第１図ＣＢ、）および（ｃ）に示すように、前方
押出成形により素材１１にネジ部１２、テーパ部１３お
よび軸部１４を形成する。(2) As shown in FIGS. 1CB, ) and 1C, the threaded portion 12, tapered portion 13, and shaft portion 14 are formed in the material 11 by forward extrusion molding.
（３）同図（Ｄ）に示すように、素材１１の頭部の中間
部を円柱形とし、その上部および下部を互いに対称な円
錐台形状に予備成形する。この場合、上下の円錐台形部
の傾斜角度αおよびβはほぼ等しく、 ８°〜１５°と
する。また、頭部上端の直径ｄ３は軸部１４の直径ｄ２
にほぼ等しい。(3) As shown in Figure (D), the middle part of the head of the material 11 is made into a cylindrical shape, and the upper and lower parts thereof are preformed into a mutually symmetrical truncated conical shape. In this case, the inclination angles α and β of the upper and lower truncated conical portions are approximately equal, and are set at 8° to 15°. Also, the diameter d3 of the upper end of the head is the diameter d2 of the shaft portion 14.
approximately equal to.
（４）最後に、同図（Ｅ）に示すように軸部１４以下を
ダイ１６に固定して上方からパンチエアで押圧すること
により、頭部を球部１５として成形する。この場合、パ
ンチ１７とダイ１６の端面を密着させて殆ど密閉した構
造となるようにするが、両者の半球形四部の周縁を面取
りしておくことにより、球部１５の中間部の周囲に環状
の空間１８を形成すると共に、球部１５の頂上にはわず
かな空間１９を残して鍛造する。なお、パンチエアの中
心軸線に沿ってエアー抜きの細い通孔２０が設けられる
。(4) Finally, as shown in FIG. 4(E), the shaft portion 14 and below are fixed to the die 16 and pressed from above with punch air to form the head portion into a spherical portion 15. In this case, the end faces of the punch 17 and the die 16 are brought into close contact with each other to form an almost airtight structure, but by chamfering the peripheries of the four hemispherical parts of both, an annular shape is formed around the middle part of the spherical part 15. At the same time, a small space 19 is left at the top of the spherical portion 15 during forging. Note that a thin air venting hole 20 is provided along the central axis of the punched air.
か欠して□、ボールスタッドの頭部は、その小間部と頂
上に真珠に近似した平担部を残すのみで、閉塞鍛造によ
り容易に球状に成形される。However, the head of the ball stud can be easily formed into a spherical shape by closed forging, leaving only a flat part resembling a pearl at the bottom and top.
（発明の効果）
以上のように、本発明の方法は、素材の外径を製造すべ
きボールスタッドの軸部の直゛径と球部の直径との間の
値にすると共に、前方押出後の予備成形による素材頭部
の形状を、中間部が円柱形でその上部および下部が互い
に対称な円錐台形状とした上で、閉塞鍛造により球形に
成形するようにしたので、従来のパリ形成に伴なう問題
点を除去し、機械加工等の後処理を殆ど必要としない高
精度の冷間鍛造を実現でき、材料の無駄もなく経済的で
あるという効果を奏する。(Effects of the Invention) As described above, the method of the present invention allows the outer diameter of the material to be set to a value between the diameter of the shaft part and the diameter of the ball part of the ball stud to be manufactured, and also to The head of the material was preformed into a cylindrical middle part and a truncated cone shape with the upper and lower parts symmetrical to each other, and then formed into a spherical shape by closed forging. The accompanying problems can be eliminated, high-precision cold forging that requires almost no post-processing such as machining can be realized, and there is no wastage of material and it is economical.
第１図は本発明によるボールスタッドの製造方法を示す
図、第２図は従来のボールスタッド製造方法を示す図で
ある。
１１−−−一素材、
１２−−−−ネジ部、
１３−−−−テーパ部、
１４−−−一軸部、
１５−−−一球部、
１６−−−−グイ、
１７−−−−パンチ、
１８および１９−−−一空間。
２０−−−一通孔。
出願人 リズム自動車部品製造株式会社代理人 弁理士
竹 内 進
（Ｄ） （Ｅ）
第２図FIG. 1 is a diagram showing a method for manufacturing a ball stud according to the present invention, and FIG. 2 is a diagram showing a conventional method for manufacturing a ball stud. 11---One material, 12---Threaded part, 13---Tapered part, 14---One shaft part, 15---One ball part, 16---Gui, 17------ Punch, 18 and 19---one space. 20---Single hole. Applicant Rhythm Auto Parts Manufacturing Co., Ltd. Agent Patent Attorney Susumu Takeuchi (D) (E) Figure 2
Claims (1)
、 （ａ）製造すべきボールスタッドの軸部の直径と球部の
直径との間の外径を有する円柱形材料を切断することに
より、完成ボールスタッドの全体積とほぼ同一の体積を
有する素材を形成する工程と、（ｂ）前方押出成形によ
り該素材にネジ部、テーパ部および軸部を形成する工程
と、 （ｃ）該素材の頭部の中間部を円柱形とし、その上部お
よび下部を互いに対称な円錐台形状に予備成形する工程
と、 （ｄ）該頭部を閉塞鍛造により球形に成形する工程と から成ることを特徴とするボールスタッドの製造方法。[Claims] A method for manufacturing a ball stud by cold forging, comprising: (a) a cylindrical material having an outer diameter between the diameter of the shank and the diameter of the ball of the ball stud to be manufactured; (b) forming a threaded portion, a tapered portion, and a shaft portion in the material by forward extrusion molding; c) Preforming the middle part of the head of the material into a cylindrical shape, and preforming the upper and lower parts into a mutually symmetrical truncated cone shape; (d) Forming the head into a spherical shape by closed forging. A method of manufacturing a ball stud, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16084984A JPS6138733A (en) | 1984-07-31 | 1984-07-31 | Production of ball stud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16084984A JPS6138733A (en) | 1984-07-31 | 1984-07-31 | Production of ball stud |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6138733A true JPS6138733A (en) | 1986-02-24 |
| JPH0459059B2 JPH0459059B2 (en) | 1992-09-21 |
Family
ID=15723728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16084984A Granted JPS6138733A (en) | 1984-07-31 | 1984-07-31 | Production of ball stud |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6138733A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62183930A (en) * | 1986-02-08 | 1987-08-12 | Rizumu Jidosha Buhin Seizo Kk | Manufacture of ball stud |
| JPS62183929A (en) * | 1986-02-08 | 1987-08-12 | Rizumu Jidosha Buhin Seizo Kk | Manufacture of ball stud |
| JPS6330142A (en) * | 1986-07-22 | 1988-02-08 | Musashi Seimitsu Ind Co Ltd | Manufacture of ball stud |
| JPS6372447A (en) * | 1986-09-17 | 1988-04-02 | Musashi Seimitsu Ind Co Ltd | Manufacture of ball stud with neck groove |
| JPS63309346A (en) * | 1987-06-10 | 1988-12-16 | Musashi Seimitsu Ind Co Ltd | Manufacture of ball stud for rack end ball joint |
| EP1640086A1 (en) * | 2004-09-24 | 2006-03-29 | Aisan Kogyo Kabushiki Kaisha | Methods for making elongated products having enlarged head portions and forging machines used therein |
| JPWO2007013675A1 (en) * | 2005-07-29 | 2009-02-12 | 昭和電工株式会社 | Forging mold, forged molded product manufacturing method and forged molded product |
| US8508511B2 (en) | 2007-11-07 | 2013-08-13 | Panasonic Corporation | Inputting device |
| CN108246961A (en) * | 2017-12-18 | 2018-07-06 | 重庆标准件工业有限责任公司 | Studs upsetting ball technique |
-
1984
- 1984-07-31 JP JP16084984A patent/JPS6138733A/en active Granted
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62183930A (en) * | 1986-02-08 | 1987-08-12 | Rizumu Jidosha Buhin Seizo Kk | Manufacture of ball stud |
| JPS62183929A (en) * | 1986-02-08 | 1987-08-12 | Rizumu Jidosha Buhin Seizo Kk | Manufacture of ball stud |
| JPS6330142A (en) * | 1986-07-22 | 1988-02-08 | Musashi Seimitsu Ind Co Ltd | Manufacture of ball stud |
| JPS6372447A (en) * | 1986-09-17 | 1988-04-02 | Musashi Seimitsu Ind Co Ltd | Manufacture of ball stud with neck groove |
| JPS63309346A (en) * | 1987-06-10 | 1988-12-16 | Musashi Seimitsu Ind Co Ltd | Manufacture of ball stud for rack end ball joint |
| EP1640086A1 (en) * | 2004-09-24 | 2006-03-29 | Aisan Kogyo Kabushiki Kaisha | Methods for making elongated products having enlarged head portions and forging machines used therein |
| JPWO2007013675A1 (en) * | 2005-07-29 | 2009-02-12 | 昭和電工株式会社 | Forging mold, forged molded product manufacturing method and forged molded product |
| JP2012232347A (en) * | 2005-07-29 | 2012-11-29 | Showa Denko Kk | Forging mold |
| US8508511B2 (en) | 2007-11-07 | 2013-08-13 | Panasonic Corporation | Inputting device |
| CN108246961A (en) * | 2017-12-18 | 2018-07-06 | 重庆标准件工业有限责任公司 | Studs upsetting ball technique |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0459059B2 (en) | 1992-09-21 |
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