JPH0459059B2 - - Google Patents
Info
- Publication number
- JPH0459059B2 JPH0459059B2 JP16084984A JP16084984A JPH0459059B2 JP H0459059 B2 JPH0459059 B2 JP H0459059B2 JP 16084984 A JP16084984 A JP 16084984A JP 16084984 A JP16084984 A JP 16084984A JP H0459059 B2 JPH0459059 B2 JP H0459059B2
- Authority
- JP
- Japan
- Prior art keywords
- head
- ball stud
- diameter
- manufacturing
- forming
- 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.)
- Expired
Links
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000010273 cold forging Methods 0.000 claims description 7
- 238000005242 forging Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Landscapes
- Forging (AREA)
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ツドの製造方法、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 part of a vehicle such as an automobile, and particularly to a method of manufacturing it by cold forging.
（従来技術）
従来、ボールスタツ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ツドの軸部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、ボールスタツ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 that is approximately the same as the diameter of the shaft portion 4 of the ball stud to be manufactured, a material 1 having a volume that is approximately the same as the total volume of the ball stud is formed. Figure 2A).
(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（バ
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となつ
ている。(4) By fixing the shaft part 4 and below to the die 6 and pressing it with the punch 7 from above, the punch 7 and the die 6
The middle part of the head 5 is made to protrude between the two to form a protrusion (burr) 5a, and the head 5 is formed into a spherical shape (FIG. E). In this case, the center of the punch 7 located at the top of the head 5 is open 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ボールスタツドの
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つて突
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。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つた。(Problems to be Solved by the Invention) However, in the above cold forging method, since the outer diameter of the material 1 is almost the same as the diameter of the shaft of the ball stud to be manufactured, the head 5 is formed into a spherical shape. When forming, punch 7 and die 6 are used as described above.
A spherical shape with a predetermined diameter is obtained by protruding a protrusion 5a from the center of the head 5 sandwiched between the two parts 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. . Additionally, post-processing such as machining is required to remove the protruding portion 5a at the end, resulting in a problem in that material is also wasted.
（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
成るボールスタツ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. ,
The object of the present invention is to provide a method for manufacturing ball studs, 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
ツドを製造する方法であつて、製造すべきボール
スタツ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
ールスタツ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 shank 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, and the 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ツドの製造
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ツドの軸部１４の直径
ｄ２と球部１５の直径Ｄ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
ルスタツ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Ｄに対し
（Ｄ／d1）2＝1.8〜2.3すなわちd1＝0.66D〜
0.75Dとなるようにする。(1) By cutting a cylindrical material having an outer diameter d1 between the diameter d2 of the shaft part 14 and the diameter D of the ball part 15 of the ball stud to be manufactured, a material having approximately the same total volume as that of the ball stud is cut. A material 11 having a volume is formed (FIG. 1A). For example, the outer diameter d1 of the material 11 is (D/d1) 2 = 1.8 to 2.3, or d1 = 0.66D to the diameter D of the spherical part.
Make it 0.75D.
(2) 第１図Ｂ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. 1B and C, the material 11 has a threaded part 12 and a tapered part 13 by front extrusion molding.
and the shaft portion 14 is formed.
(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 are preformed into a symmetrical truncated cone shape. in this case,
The inclination angles α and β of the upper and lower truncated conical portions are approximately equal, and are 8° to 15°. Further, the diameter d3 of the upper end of the head is approximately equal to the diameter d2 of the shaft portion 14.
(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１７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、両者の半球形凹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１７の中心軸線に沿つてエアー抜きの細
い通孔２０が設けられる。(4) Finally, as shown in FIG. E, the shaft portion 14 and below are fixed to the die 16 and pressed from above with a punch 17 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 periphery of the hemispherical recess 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. In addition,
A narrow through hole 20 for venting air is provided along the central axis of the punch 17.
かくして、ボールスタツドの頭部は、その中間
部と頂上に真球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。 In this way, the head of the ball stud only has a flat part that approximates a true sphere in the middle and at the top.
Easily formed into a spherical shape by closed forging.
（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ツ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、従来のバ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 By forming the head of the material into a cylindrical middle part and a symmetrical truncated cone shape at the top and bottom, the head is formed into a spherical shape by closed forging, which eliminates the problem of conventional burr formation. This eliminates the problem of high precision cold forging that requires almost no post-processing such as machining, and has the effect of being economical without wasting material.
第１図は本発明によるボールスタツドの製造方
法を示す図、第２図は従来のボールスタツド製造
方法を示す図である。
１１……素材、１２……ネジ部、１３……テー
パ部、１４……軸部、１５……球部、１６……ダ
イ、１７……パンチ、１８および１９……空間、
２０……通孔。
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...Material, 12...Threaded part, 13...Tapered part, 14...Shaft part, 15...Spherical part, 16...Die, 17...Punch, 18 and 19...Space,
20...Through hole.
Claims (1)
法であつて、 (a) 製造すべきボールスタツ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、完成ボールスタツドの全体
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ツドの製造
方法。[Claims] 1. A method for manufacturing a ball stud by cold forging, comprising: (a) 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; (b) forming a threaded portion, a tapered portion, and a shaft portion in the material by forward extrusion molding; (c) forming 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 conical shape; (d) forming the head into a spherical shape by closed forging; A method for manufacturing a ball stud, characterized by comprising the steps of:
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 JPS6138733A (en) | 1986-02-24 |
| JPH0459059B2 true 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) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0688097B2 (en) * | 1986-02-08 | 1994-11-09 | リズム自動車部品製造株式会社 | Ball stud manufacturing method |
| JPH0688096B2 (en) * | 1986-02-08 | 1994-11-09 | リズム自動車部品製造株式会社 | Ball stud manufacturing method |
| 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 |
| JPH0683884B2 (en) * | 1987-06-10 | 1994-10-26 | 武蔵精密工業株式会社 | Manufacturing method of ball studs for rack end ball joints |
| JP2006088197A (en) * | 2004-09-24 | 2006-04-06 | Aisan Ind Co Ltd | Manufacturing method for axial product with expanded head, manufacturing method for engine valve, and forging die used for manufacturing axial product with expanded head |
| 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 |
| JP5151405B2 (en) | 2007-11-07 | 2013-02-27 | パナソニック株式会社 | Input 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6138733A (en) | 1986-02-24 |
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