JPH0346208B2 - - Google Patents
Info
- Publication number
- JPH0346208B2 JPH0346208B2 JP12678883A JP12678883A JPH0346208B2 JP H0346208 B2 JPH0346208 B2 JP H0346208B2 JP 12678883 A JP12678883 A JP 12678883A JP 12678883 A JP12678883 A JP 12678883A JP H0346208 B2 JPH0346208 B2 JP H0346208B2
- Authority
- JP
- Japan
- Prior art keywords
- material tube
- ball joint
- mold
- press
- cylindrical
- 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
- 239000000463 material Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/02—Making hollow objects characterised by the structure of the objects
- B21D51/08—Making hollow objects characterised by the structure of the objects ball-shaped objects
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
- Forging (AREA)
- Pivots And Pivotal Connections (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は円筒状の素材管の両端のみを加熱し
た後に金型プレス成形するところの、素材管から
中空のボール継手を成形する方法に関するもので
ある。[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method for forming a hollow ball joint from a cylindrical material tube, which involves heating only both ends of the material tube and then press-molding it with a mold. It is.
一般に構築物などのパイプ状の梁の交点にはボ
ール状の継子がよく用いられている。
Generally, ball-shaped steps are often used at the intersections of pipe-shaped beams in structures.
従来のボール継手は鋳造や鍛造によつて中実状
の物しか製作できなかつたため、外周面に梁を接
続する穴加工が困難であつたとともに、重量も重
くなり、更に仕上りあるいは寸法精度などの点で
難があつた。また従来も円筒状の素材管から中空
のボールを成形する方法はあつたが、それは第９
図(a)，(b)に示すように、比較的薄肉の円筒状素材
管１をその両端を筒軸にほぼ直角に切断した状態
で、上型２及び下型３にそれぞれ球状の凹部４，
５が対峙して形成される金型プレス６の凹部４，
５内に挿入され、その後冷間加工によつて、上型
２の押圧力により球状に成形される方法であつ
た。 Conventional ball joints could only be made in solid form by casting or forging, which made it difficult to drill holes to connect the beams on the outer circumferential surface, increased the weight, and caused problems in terms of finish and dimensional accuracy. There was a problem. There was also a method of forming a hollow ball from a cylindrical material tube, but this method was
As shown in Figures (a) and (b), with both ends of a relatively thin cylindrical material tube 1 cut at almost right angles to the cylinder axis, spherical recesses 4 are formed in the upper mold 2 and the lower mold 3, respectively. ，
The recessed portion 4 of the mold press 6 is formed by facing each other.
5, and then cold-worked into a spherical shape by the pressing force of the upper mold 2.
しかしこの方法ではすべて冷間で成形されるた
め、比較的薄肉の中空ボールしか製造できず、構
築物などの継手に使用するには強度的に問題があ
つた。また従来の中空ボール成形方法では、第９
図(b)に示すように、両端に穴７が大きく残つてし
まい、例えばボール継手として使用する場合に
は、何らかの方法によりその穴７を適当な大きさ
に狭める必要があるという面倒な作業が必要であ
つた。
However, because this method is entirely cold-formed, only relatively thin-walled hollow balls can be produced, which poses problems in terms of strength when used in joints for structures and the like. In addition, in the conventional hollow ball forming method, the 9th
As shown in Figure (b), large holes 7 remain at both ends, and when used as a ball joint, for example, the holes 7 must be narrowed to an appropriate size by some method, which is a troublesome process. It was necessary.
この発明は以上に述べた事情に鑑みなされたも
ので、両端部に外方へ向つてそれぞれテーパ状拡
開部が形成される比較的肉厚の円筒状を呈し、両
端部周辺のみを加熱された素材管を挿入すべくこ
の素材管の径より大きくした径を有する半球状凹
部を形成した上型と下型とをそれぞれ対峙して形
成される金型プレスからなり、前記半球状凹部内
に前記素材管の筒軸が上下方向になるように挿入
し、前記両型の押圧力によりこの挿入された素材
管を球状に加工するようにしたことを特徴とする
素材管から中空のボール継手を成形する方法を提
供するものである。
This invention was made in view of the above-mentioned circumstances, and has a relatively thick cylindrical shape with outwardly tapered openings formed at both ends, and is heated only around both ends. The mold press is formed by opposing an upper mold and a lower mold each forming a hemispherical recess having a diameter larger than the diameter of the material pipe into which the material pipe is inserted. A hollow ball joint is made from a material tube, characterized in that the material tube is inserted so that its cylindrical axis is in the vertical direction, and the inserted material tube is processed into a spherical shape by the pressing force of the two molds. The present invention provides a method for molding.
上記方法において、前記上型と下型との間に素
材管を、その筒軸が上下になるように挿入し、両
型の押圧力により、前記素材管を球状に加工する
ものである。
In the above method, a material tube is inserted between the upper mold and the lower mold so that its cylindrical axis is vertically aligned, and the material tube is processed into a spherical shape by the pressing force of both molds.
以下に添付図面に基づいてこの発明を詳細に説
明する。
The present invention will be described in detail below based on the accompanying drawings.
第１図から第７図はこの発明による成形する方
をこの工程の順序にしたがつて示す断面図で、ま
ず第１図に示すように長尺の比較的肉厚のパイプ
１０を適当な長さに切断し素材管１１が形成され
る。次に第２図に示すように素材管１１の両端部
にそれぞれ外方に向つてテーパ状拡開部１２が形
成される。そして第３図に示すようにテーパ状拡
開部１２が形成された素材管１１はその両端部周
辺が加熱された後に、直ちに上型１３と下型１４
との間に持ち来たす。これら上型１３と下型１４
には前記素材管１１の径より大きくした径を有す
る半球状凹部１５，１６が対峙して形成され、か
つ下型１４の上下方向には凹部１６に連結される
小孔１７が穿設されるととももに、小孔１７内に
は押し棒１８が摺動可能に内設され、全体として
金型プレス１９が構成され、前述の半球状凹部１
５，１６内に素材管１１の筒軸が上下方向となる
ように挿入される。半球状凹部１５，１６内に挿
入された素材管１１は第４図に示すように上型１
３の下降によつて押圧変形され、ほぼ球状に成形
される。そして第５図に示すように、上型１３及
び下型１４が上下方向に開き、押し棒１８の摺動
によつて球状に成形された中空のボール継手２０
が、半球状凹部１５，１６から取り出される。 FIGS. 1 to 7 are cross-sectional views showing the method of forming according to the present invention according to the order of the steps. First, as shown in FIG. A material tube 11 is formed by cutting the material into a material tube 11. Next, as shown in FIG. 2, outwardly tapered enlarged portions 12 are formed at both ends of the material tube 11, respectively. As shown in FIG. 3, after the material tube 11 with the tapered expanded portion 12 is heated around both ends thereof, the upper mold 13 and the lower mold 14 are immediately heated.
I will bring it between. These upper mold 13 and lower mold 14
Hemispherical recesses 15 and 16 having a diameter larger than the diameter of the material tube 11 are formed facing each other, and a small hole 17 connected to the recess 16 is bored in the vertical direction of the lower mold 14. In addition, a push rod 18 is slidably installed inside the small hole 17, and a mold press 19 is constructed as a whole, and the hemispherical recess 1 described above is
The material tube 11 is inserted into the tubes 5 and 16 so that its cylindrical axis is oriented in the vertical direction. The material tube 11 inserted into the hemispherical recesses 15 and 16 is inserted into the upper mold 1 as shown in FIG.
3, it is pressed and deformed and formed into a substantially spherical shape. As shown in FIG. 5, the upper mold 13 and the lower mold 14 are opened in the vertical direction, and a hollow ball joint 20 is formed into a spherical shape by sliding the push rod 18.
is taken out from the hemispherical recesses 15 and 16.
なお前述のように素材管１１の両端部にはテー
パ状拡開部１２が形成されるが、これは仮に素材
管１１の両端部を筒軸にほぼ直角に切断したまま
（第１図に示す）であると、素材管１１が比較的
肉厚であるため、球状に形成した後に第６図に示
すように、両端に残る孔２１が皿状になり、第７
図に示すようにねじ加工する際に、所定のねじ加
工が困難となるのを防止するためである。また素
材管１１を金型プレス１９によつて押圧成形する
前に、素材管１１の両端部周辺のみを加熱する
が、これは仮に素材管１１全体を加熱して押圧成
形した場合には第８図に示すように素材管１１の
側部が座屈して突条23等ができるため、これを防
止するために素材管１１の両端部周辺のみを加熱
することとしたのである。 As mentioned above, the tapered expanded portions 12 are formed at both ends of the material tube 11, but these are created by cutting both ends of the material tube 11 at approximately right angles to the cylinder axis (as shown in FIG. 1). ), since the material tube 11 is relatively thick, the holes 21 remaining at both ends become dish-shaped after being formed into a spherical shape, as shown in FIG.
This is to prevent predetermined thread processing from becoming difficult when threading as shown in the figure. Also, before the material tube 11 is press-formed by the die press 19, only the periphery of both ends of the material tube 11 is heated. However, if the entire material tube 11 is heated and press-formed, As shown in the figure, the side portions of the material tube 11 buckle, forming protrusions 23, etc., so in order to prevent this, it was decided to heat only the periphery of both ends of the material tube 11.
この発明によるボール継手を成形する方法によ
れば、かなり肉厚のボール継手を金型プレス成形
によつて成形することができ、また成形されたボ
ール継手は中空なので、穴加工やねじ加工がしや
すく、更に円筒状の素材管を使用して、プレス加
工により中空のボール継手とした際にも、両端に
残る小孔を小さくすることができるため、ねじ加
工すればそのまま梁等を連結するための連結手段
とすることも可能である。なお中空のボール継手
であるため、より軽量とすることができ、そして
プレス成形なので大量生産することができ、ボー
ル継手を安価に製造することが可能で、更に表面
もなめらかとなり、したがつて塗装などがしやす
くなり、寸法精度が高く、均一なボール継手を成
形することができる等の有効な効果を有し、その
利用価値は顕著である。
According to the method for molding a ball joint according to the present invention, a fairly thick ball joint can be molded by die press molding, and since the molded ball joint is hollow, it is easy to drill holes and threads. It is easy to use, and even when a cylindrical material pipe is used to make a hollow ball joint by press processing, the small holes remaining at both ends can be made smaller, so it is possible to connect beams, etc. as is by threading it. It is also possible to use it as a connecting means. Since it is a hollow ball joint, it can be made lighter, and since it is press-formed, it can be mass-produced, making it possible to manufacture ball joints at low cost.The surface is also smooth, so it is easy to paint. It has the advantageous effects of being able to easily form a ball joint with high dimensional accuracy, uniformity, etc., and its utility value is remarkable.
一般に素材管の両端部にテーパ加工が施こされ
ない場合には、素材管の両端の開口は、押圧成形
後、皿状の孔になり、これはその皿状の孔に所定
径のねじ加工を施すことを困難にさせるが、この
発明によれば、円筒状の素材管の両端部には、外
方へ向つてテーパ状拡開部がそれぞれ形成される
ので、素材管の両端の開口は、押圧成形後、円柱
孔とすることができ、その後のねじ加工に支障が
生じるのを回避することができる。 Generally, if both ends of the material tube are not tapered, the openings at both ends of the material tube will become dish-shaped holes after pressure forming, and this will require threading of a predetermined diameter into the dish-shaped holes. However, according to the present invention, outwardly tapered widening portions are formed at both ends of the cylindrical material tube, so that the openings at both ends of the material tube are After the press molding, a cylindrical hole can be formed, and it is possible to avoid problems in subsequent thread processing.
また素材管を型によりその筒軸方向へ押圧する
のに先立つて、素材管の両端部周辺のみを加熱す
る操作を省略した場合には、素材管の筒軸方向中
間部に、突条２３等が生じることがあるが、この
発明では、テーパ状拡開部を形成された素材管の
両端部周辺のみが加熱されてから、素材管が型に
よりその筒軸方向へ押圧されるので、筒軸方向中
間部に突条が生じるような事態を確実に回避する
ことができる。 In addition, if the operation of heating only the periphery of both ends of the material tube before pressing the material tube in the direction of its cylinder axis with a mold is omitted, a protrusion 23 etc. However, in this invention, only the periphery of both ends of the material tube in which the tapered expanded portion is formed is heated, and then the material tube is pressed by the mold in the direction of its cylinder axis. It is possible to reliably avoid a situation where a protrusion occurs in the intermediate portion in the direction.
第１図から第５図はこの発明による方法を示す
それぞれの工程の断面図、第６図は従来の方法に
より成形した場合のボール継手を示す断面図、第
７図はこの発明による方法で成形したボール継手
の一部断面図、第８図は素材管全体を加熱した際
の変形状態を示す断面図で、第９図ａ，ｂは従来
の方法を示す断面図である。
なお図面において、１１…素材管、１２…テー
パ状拡開部、１３…上型、１４…下型、１５，１
６…半球状凹部、１９…金型プレスである。
Figures 1 to 5 are cross-sectional views showing each step of the method according to the present invention, Figure 6 is a cross-sectional view showing a ball joint formed by the conventional method, and Figure 7 is a cross-sectional view showing the ball joint formed by the method according to the present invention. FIG. 8 is a sectional view showing a deformed state when the entire material pipe is heated, and FIGS. 9a and 9b are sectional views showing a conventional method. In the drawings, 11...Material tube, 12...Tapered expanded portion, 13...Upper mold, 14...Lower mold, 15,1
6... Hemispherical recess, 19... Die press.
Claims (1)
部が形成される比較的肉厚の円筒状を呈し、両端
部周辺のみを加熱された素材管を挿入すべくこの
素材管の径より大きくした径を有する半球状凹部
を形成した上型と下型とをそれぞれ対峙して形成
される金型プレスからなり、前記半球状凹部内に
前記素材管の筒軸が上下方向になるように挿入
し、前記両型の押圧力によりこの挿入された素材
管を球状に加工するようにしたことを特徴とする
素材管から中空のボール継手を成形する方法。1 It has a relatively thick cylindrical shape with outwardly tapered openings at both ends, and the diameter of the heated material tube is larger than that of the material tube only around both ends. The material tube is inserted into the hemispherical recess so that the cylindrical axis of the material tube is in the vertical direction. A method for forming a hollow ball joint from a material tube, characterized in that the inserted material tube is processed into a spherical shape by the pressing force of the two molds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12678883A JPS6018238A (en) | 1983-07-12 | 1983-07-12 | Method for forming hollow ball joint from blank pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12678883A JPS6018238A (en) | 1983-07-12 | 1983-07-12 | Method for forming hollow ball joint from blank pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6018238A JPS6018238A (en) | 1985-01-30 |
| JPH0346208B2 true JPH0346208B2 (en) | 1991-07-15 |
Family
ID=14943950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12678883A Granted JPS6018238A (en) | 1983-07-12 | 1983-07-12 | Method for forming hollow ball joint from blank pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6018238A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0751251B2 (en) * | 1988-03-11 | 1995-06-05 | 株式会社小澤商会 | Steel pipe space truss manufacturing method |
| US20100310815A1 (en) | 2008-02-01 | 2010-12-09 | Omnidea, Lda. | Plastic deformation technological process for production of thin wall revolution shells from tubular billets |
| CN103240347B (en) * | 2013-05-08 | 2015-04-15 | 宁波奥特唯工具有限公司 | Portable multi-caliber pipe pressing device |
-
1983
- 1983-07-12 JP JP12678883A patent/JPS6018238A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6018238A (en) | 1985-01-30 |
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