JP2614593B2 - Eye joint manufacturing method - Google Patents

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、アイ形ジョイントの製
造方法、即ちアイ（ｅｙｅ）形の頭部と側方へ突設した
パイプ部との間に連通孔を有する構造の流体給・排用の
ジョイントを製造する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an eye-shaped joint, that is, a fluid supply / drainage structure having a communication hole between an eye-shaped head and a pipe projecting sideways. And a method for manufacturing a joint for use with the same.

【０００２】[0002]

【従来の技術】アイ形ジョイントは、例えば自動車で燃
料・オイル等の流体を給・排用に、タンク部と配管との
接続箇所で用いられるものであり、その形状は一般に図
１２・図１３・図１４で示すようなものである。その使
用状態は図１３で示す如く、タンク部４３に形成したネ
ジ孔４４上に、シール材４５を介して該アイ形ジョイン
トの頭部を載置させ、側部から先端部にかけて通孔４７
をもつ締付けボルト４６を、上記頭部を経てタンク部４
３のネジ孔４４に螺合させる。他方、頭部側方へ突設し
た接続パイプ３５に配管４８を繋ぐことで、タンク部４
３と配管４８とを連通状態にて接続させるものである。2. Description of the Related Art An eye-shaped joint is used at a connection point between a tank portion and a pipe for supplying and discharging a fluid such as fuel or oil in an automobile, for example. -It is as shown in FIG. As shown in FIG. 13, the head of the eye-shaped joint is placed on a screw hole 44 formed in a tank portion 43 via a sealing material 45 as shown in FIG.
The tightening bolt 46 having the shape shown in FIG.
3 is screwed into the screw hole 44. On the other hand, by connecting the pipe 48 to the connection pipe 35 protruding toward the head side, the tank section 4
3 and the pipe 48 are connected in a communicating state.

【０００３】このアイ形ジョイントを製造するには、従
来の一般技術からして、１）鋳造で成形した後に切削し
て仕上げる方法、２）丸棒材を冷間鍛造して成形した後
に、切削して仕上げる方法等が考えられる。しかし、上
記１）の鋳造で成形するものは、内部に巣が生じ易い
し、その後の切削仕上げが難しいという問題点がある。
また上記２）の丸棒材から冷間鍛造で成形するものは、
コストが高くつくし、やはりその後に切削仕上げする必
要があった。[0003] In order to manufacture the eye-shaped joint, according to the conventional general technology, 1) a method of finishing by forming after casting, and 2) a method of forming a round bar by cold forging and then cutting. And finishing. However, there is a problem that the cavities are easily formed in the mold formed by the casting of the above 1), and the subsequent cutting is difficult.
In the case of the above-mentioned 2) which is formed by cold forging from a round bar material,
The cost was high, and it was necessary to finish the work afterwards.

【０００４】そこで開発されたのが、金属の平板条材か
ら切削にて製造する方法である。この製造方法は、例え
ば厚みが１５ｍｍ、幅２８ｍｍ、長さ４ｍ程度の金属の
平板条材から、１個分ずつ頭部とパイプ部をもつ外形に
切削するとともに、頭部にアイ形用孔を、またパイプ部
に通孔を各々穿設し、次にアイ形用孔の内周面を湾曲状
に切削し、パイプ部の通孔のバリ取りをした後、頭部の
両側端面等を切削し、かつパイプ部の通孔に段部を形成
するものである。A method developed by cutting from a flat metal strip has been developed. In this manufacturing method, for example, a metal plate having a thickness of 15 mm, a width of 28 mm, and a length of about 4 m is cut into an outer shape having a head and a pipe portion by one piece, and an eye-shaped hole is formed in the head. Also, drill through holes in the pipe part, then cut the inner peripheral surface of the eye-shaped hole into a curved shape, deburr the through hole in the pipe part, and then cut both end faces of the head, etc. And a step portion is formed in the through hole of the pipe portion.

【０００５】[0005]

【発明が解決しようとする課題】ところが、上記の金属
の平板条材から切削して製造する方法は、切削除去する
部分が非常に多く、材料に対する製品の重量比は３分の
１程度になってしまい、材料費が非常に不経済である。
また、上記の切削加工に数種類の単能機・専用機・自動
機等を必要とするので、加工費も高くついているし、生
産効率もあまり高くない、という問題点が別個に生じて
くる。However, in the above-mentioned method of manufacturing by cutting from a metal flat plate, the portion to be cut and removed is very large, and the weight ratio of the product to the material is reduced to about one third. The cost of materials is very uneconomical.
In addition, since several types of single-purpose machines, special-purpose machines, automatic machines, and the like are required for the above-mentioned cutting, the problems that the machining cost is high and the production efficiency is not so high arise separately.

【０００６】そこでこの製造方法では、材料費や加工費
を低減するため、これまでも機械の改良その他種々な工
夫がなされてきたが、それももはや限界になっている。
しかし加工メーカーには、さらに一層のコストダウンが
求められている現状にある。In order to reduce material and processing costs, various improvements and other improvements have been made so far in this manufacturing method, but this is no longer the limit.
However, processing manufacturers are now required to further reduce costs.

【０００７】本発明は、上記従来のアイ形ジョイントの
製造方法がもつ問題点を解決しようとするものである。
即ち、本発明の目的は、従来の製造方法を見直し、材料
の無駄を無くすとともに、高精度な仕上がりで切削仕上
げ加工を不要とし、かつ生産効率も向上させることによ
り、大幅にコストダウンを図れるような、アイ形ジョイ
ントの製造方法を提供することにある。An object of the present invention is to solve the problems associated with the above-described conventional method for manufacturing an eye-shaped joint.
That is, an object of the present invention is to reconsider the conventional manufacturing method, eliminate waste of materials, eliminate the need for cutting and finishing with a high-precision finish, and improve production efficiency, so that cost can be significantly reduced. Another object of the present invention is to provide a method for manufacturing an eye-shaped joint.

【０００８】[0008]

【課題を解決するための手段】本発明に係るアイ形ジョ
イントの製造方法は、製品であるアイ形ジョイントＡの
外径Ｄとほぼ等しい外径で、その高さＨに応じて所定の
長さに切断した金属パイプ製の素管ａを、三段階のプレ
ス工程とパイプ接続工程を経てアイ形ジョイントＡに形
成するものであり、According to the present invention, there is provided a method of manufacturing an eye-shaped joint having an outer diameter substantially equal to an outer diameter D of an eye-shaped joint A as a product, and a predetermined length corresponding to a height H thereof. A metal pipe a cut into a pipe is formed into an eye-shaped joint A through a three-stage pressing step and a pipe connecting step,

【０００９】第１プレス工程では、上記金属パイプ製の
素管ａを、該素管ａの厚みと等しい間隙の環状凹溝３，
４で、その各奥端に凹曲面部５，６を各々有する第１固
定金型１と第１押し金型２とでプレスして、素管ａの各
端縁に凸曲面部８，９をもつ第１中間製品７を形成し
（図１ないし図４参照）、In the first pressing step, the raw pipe a made of metal pipe is inserted into the annular concave grooves 3 having a gap equal to the thickness of the raw pipe a.
At 4, the first fixed mold 1 and the first pressing mold 2 each having concave curved surface portions 5 and 6 at the respective back ends thereof are pressed to form convex curved surface portions 8 and 9 at each edge of the base tube a. To form a first intermediate product 7 having (see FIGS. 1 to 4),

【００１０】第２プレス工程では、上記第１中間製品７
を、アイ形ジョイントＡの外径Ｄと等しい内径の短円柱
状孔１２，１３で、その各奥部に奥端寄りほど小径の円
錐台状孔１４，１５を各々有する第２固定金型１０と第
２押し金型１１とでプレスして、第１中間製品７の下寄
り部分と上寄り部分とに、中心線方向へ傾いた断面テー
パ状部１７，１８をもつ第２中間製品１６を形成し（図
５ないし図７参照）、In the second pressing step, the first intermediate product 7
A second fixed mold 10 having short cylindrical holes 12 and 13 having an inner diameter equal to the outer diameter D of the eye-shaped joint A and having truncated conical holes 14 and 15 each having a smaller diameter toward the inner end thereof. And a second pressing die 11 to form a second intermediate product 16 having tapered cross-sections 17, 18 inclined in the center line direction at the lower part and the upper part of the first intermediate product 7. (See FIGS. 5-7)

【００１１】第３プレス工程では、上記第２中間製品１
６を、アイ形ジョイントＡの外径Ｄと高さＨに等しい外
径と深さの短円柱状孔２１をもつ第３固定金型１９と、
平板状の押し面２２をもつ第３押し金型２０とでプレス
して、第２中間製品１６の下寄り部分と上寄り部分を、
中心線Ｘに直交する平面をもつ中央孔付き円板状部２
３，２４に形成するとともに（図８ないし図９参照）、In the third pressing step, the second intermediate product 1
6, a third fixed mold 19 having a short cylindrical hole 21 having an outer diameter and a depth equal to the outer diameter D and the height H of the eye-shaped joint A;
By pressing with a third pressing mold 20 having a flat pressing surface 22, the lower part and the upper part of the second intermediate product 16 are
Disc 2 with a central hole having a plane orthogonal to the center line X
3 and 24 (see FIGS. 8 and 9),

【００１２】かつ各中央孔２５，２６に、外径がアイ形
ジョイントＡの内周端縁２７，２８の各内径ｄに等しい
中央孔補正棒２９を圧入して、所定の内径の内周端縁３
１，３２をもつ第３中間製品３０を形成し（図１０ない
し図１１参照）、A central hole correction rod 29 having an outer diameter equal to the inner diameter d of the inner peripheral edge 27, 28 of the eye-shaped joint A is press-fitted into each of the central holes 25, 26, and the inner peripheral end having a predetermined inner diameter is inserted. Rim 3
Forming a third intermediate product 30 having 1, 32 (see FIGS. 10 and 11);

【００１３】パイプ接続工程は、上記第３中間製品３０
の側周部３３の一部に通孔３４を形成した後に、該通孔
３４に接続パイプ３５を固着するものである（図１２・
図１４参照）。In the pipe connecting step, the third intermediate product 30
After forming a through hole 34 in a part of the side peripheral portion 33, a connecting pipe 35 is fixed to the through hole 34 (FIG. 12).
See FIG. 14).

【００１４】なお、上記アイ形ジョイントＡの上・下の
円板状部２３，２４は、プレス加工で平坦面に仕上がっ
ているが、使用時にシール材と密着させた際のシール効
果を高めるため、同心円状の条で浅い凹凸面が形成され
るように、敢えて切削加工を施しておいてもよい。The upper and lower disc-shaped portions 23 and 24 of the eye-shaped joint A are finished to be flat by press working. However, in order to enhance the sealing effect when they are brought into close contact with a sealing material during use. Alternatively, a cutting process may be performed so that a concavo-convex strip forms a shallow uneven surface.

【００１５】[0015]

【作用】上記本発明に係るアイ形ジョイントＡの製造方
法では、素材としては、製品としてのアイ形ジョイント
Ａの外径Ｄとほぼ等しい外径で、かつその高さに応じて
所定の長さに切断した短円筒状の金属パイプ製の素管ａ
を用いればよい（図１参照）。そのため、従来の丸棒材
や平板条材を用いてアイ形ジョイントを製造するもの
が、不要部を切削・除去したり打ち抜いたりする必要が
あったのと異なり、本発明での素管ａは、バリ３６にな
る部分を除くと、体積を変えること無しにアイ形ジョイ
ントＡに変形されるので、材料が無駄にならずコストを
大幅に低減している。In the method of manufacturing the eye-shaped joint A according to the present invention, the material is an outer diameter substantially equal to the outer diameter D of the eye-shaped joint A as a product, and has a predetermined length according to its height. Tube a made of short cylindrical metal pipe
(See FIG. 1). Therefore, unlike the conventional method of manufacturing an eye-shaped joint using a round bar or a flat strip, it is necessary to cut, remove, or punch out unnecessary portions. Excluding the portion that becomes the burr 36, the joint is deformed into the eye-shaped joint A without changing the volume, so that the material is not wasted and the cost is greatly reduced.

【００１６】本製造方法の第１プレス工程では、上記金
属パイプ製の素管ａの各端縁に凸曲面状部８，９を形成
している（図４参照）。そのため、後の第３プレス工程
において、第３固定金型１９と第３押し金型２０でプレ
スして、上・下面を中心線Ｘに直交する平面をもつ中央
孔付き円板状部２３，２４を形成した後、その各中央孔
２５，２６に中央孔補正棒２９を圧入する際、該中央孔
補正棒２９の圧入をスムーズに行うことができ（図１０
参照）、かつ該各中央孔２５，２６の内周端縁３１，３
２が補正棒２９の外周面に沿って高精度な内周面を形成
することができる（図１１参照）。In the first pressing step of the present manufacturing method, convex curved portions 8 and 9 are formed at each end of the metal pipe a (see FIG. 4). Therefore, in the subsequent third pressing step, the upper and lower surfaces are pressed by the third fixed die 19 and the third pressing die 20 to form a disc-shaped portion 23 with a central hole having a plane perpendicular to the center line X, When the central hole correction rod 29 is press-fitted into each of the central holes 25 and 26 after the formation of the central hole 24, the central hole correction rod 29 can be smoothly pressed (FIG. 10).
And the inner peripheral edges 31 and 3 of the central holes 25 and 26, respectively.
2 can form a highly accurate inner peripheral surface along the outer peripheral surface of the correction rod 29 (see FIG. 11).

【００１７】また、本製造方法の第２プレス工程では、
第１中間製品７の下寄り部分と上寄り部分とを中心線Ｘ
方向へ折り曲げ、中心線Ｘ方向へ傾いた断面テーパ状部
１７，１８に形成している（図６・図７参照）。そのた
め、後の第３プレス工程において、第３固定金型１９と
第３押し金型２０間でプレスして、中心線Ｘに直交する
平面をもつ中央孔付き円板状部２３，２４を形成する際
に、無理なくかつスムーズに内方へ折れ曲がり、中心線
Ｘに直交する中央孔付き円板状部２３，２４を形成する
ことができる（図９参照）。Further, in the second pressing step of the present manufacturing method,
Center line X between the lower part and the upper part of the first intermediate product 7
It is bent in the direction and formed in the tapered sections 17 and 18 inclined in the direction of the center line X (see FIGS. 6 and 7). Therefore, in the subsequent third pressing step, the disk is pressed between the third fixed die 19 and the third pressing die 20 to form the disc-shaped portions 23 and 24 with the central holes having a plane perpendicular to the center line X. In doing so, it is possible to smoothly and smoothly bend inward to form the disk-shaped portions 23, 24 with central holes orthogonal to the center line X (see FIG. 9).

【００１８】上記の如く、第１プレス工程・第２プレス
工程・第３プレス工程を経て成形された第３中間製品３
０は、その外径および高さは製品としてのアイ形ジョイ
ントＡの外径Ｄ・高さＨと同一の寸法に形成されるとと
もに、その中央孔付き円板状部２３，２４の内周端縁３
１，３２も、アイ形ジョイントＡの内周端縁２７，２８
の内径と同一寸法に高精度に形成される。そのため、そ
れらの部分を切削仕上げする必要は全くない。なお、該
第３中間製品３０の側周部３３の内径は、当初の素管ａ
から僅かに肉厚を増している程度であるから、その内周
部を切削して内径を大きくするような必要がない。As described above, the third intermediate product 3 formed through the first pressing step, the second pressing step, and the third pressing step
0 indicates that the outer diameter and height are formed to be the same as the outer diameter D and the height H of the eye-shaped joint A as a product, and the inner peripheral ends of the disc-shaped portions 23 and 24 with central holes. Rim 3
1, 32 are also the inner peripheral edges 27, 28 of the eye-shaped joint A.
It is formed with the same dimensions as the inner diameter of the high precision. Therefore, there is no need to cut and finish those portions. The inner diameter of the side peripheral portion 33 of the third intermediate product 30 is the same as the initial tube a
Therefore, it is not necessary to cut the inner peripheral portion to increase the inner diameter.

【００１９】したがって、この第３中間製品３０に対
し、次のパイプ接続工程において側周部に形成した通孔
３４へ接続パイプ３５を固着すれば、これで低コストか
つ高精度な製品としてのアイ形ジョイントＡが出来上が
る。Therefore, if the connecting pipe 35 is fixed to the through hole 34 formed in the side peripheral portion in the next pipe connecting step, the third intermediate product 30 can be used as an inexpensive and highly accurate product. Shape joint A is completed.

【００２０】[0020]

【実施例】図１２・図１３・図１４は、本発明に係る製
造方法で製造したアイ形ジョイントＡを示し、図１ない
し図１２は、本発明に係るアイ形ジョイントの製造方法
の各工程を示している。本発明に係るアイ形ジョイント
の製造方法では、素材として、製品であるアイ形ジョイ
ントＡの外径Ｄとほぼ等しく、かつその高さＨに応じて
所定の長さに切断した金属パイプ製の素管ａを用いる。
ここで金属パイプとは、例えば鉄やステンレスパイプで
ある（図１参照）。FIG. 12, FIG. 13 and FIG. 14 show an eye joint A manufactured by the manufacturing method according to the present invention, and FIGS. 1 to 12 show the respective steps of the manufacturing method of the eye joint according to the present invention. Is shown. In the method for manufacturing an eye-shaped joint according to the present invention, as a material, a metal pipe element which is substantially equal to the outer diameter D of the eye-shaped joint A as a product and cut to a predetermined length in accordance with the height H thereof. Use tube a.
Here, the metal pipe is, for example, an iron or stainless steel pipe (see FIG. 1).

【００２１】第１プレス工程での第１固定金型１と第１
押し金型２は各々、上記該素管ａの厚みと等しい間隙の
環状凹溝３，４を有し、かつその奥端部に凹曲面部５，
６を有する。この第１固定金型１と第１押し金型２でプ
レスすることにより、素管ａの各端縁に凸曲面状部８，
９を有する第１中間製品７が形成する（図１ないし図４
参照）。The first stationary mold 1 and the first stationary mold 1 in the first pressing step
Each of the pressing dies 2 has annular concave grooves 3 and 4 having a gap equal to the thickness of the base tube a, and a concave curved surface portion 5 at the inner end thereof.
6. By pressing the first fixed mold 1 and the first pressing mold 2, a convex curved surface portion 8,
A first intermediate product 7 having a first intermediate product 9 is formed.
reference).

【００２２】上記第１固定金型１と第１押し金型２で、
各環状凹溝３，４の各奥端部の凹曲面部５，６の形状
は、素管ａの厚みにほぼ等しい半径の曲面に形成してお
くのがよい。なお第１固定金型１は単体ではなく、上方
へ摺動可能な内金型３７との間で、上記環状凹溝３と凹
曲面部５を形成しており、また該内金型３７の下部に第
１中間製品推出し棒３８を螺装してある（図２参照）。The first fixed die 1 and the first pressing die 2
It is preferable that the shape of the concave curved surface portions 5 and 6 at the innermost ends of the annular concave grooves 3 and 4 be formed in a curved surface having a radius substantially equal to the thickness of the base tube a. Note that the first fixed mold 1 is not a single unit, but forms the annular groove 3 and the concave curved surface portion 5 with an inner mold 37 slidable upward. A first intermediate product pushing rod 38 is screwed on the lower part (see FIG. 2).

【００２３】また第１固定金型１の環状凹溝３の深さ
は、第１押シ金型２の環状凹溝３の深さよりも少し深め
にして、両金型１，２が離脱後に第１中間製品７が残る
ようにしてある。なお図示は省略するが、第１中間製品
７の上・下寄り部分が端部寄り程、肉厚をやや薄くして
おいてもよい。Further, the depth of the annular groove 3 of the first fixed mold 1 is set to be slightly larger than the depth of the annular groove 3 of the first pressing mold 2, and after the two molds 1 and 2 are separated. The first intermediate product 7 remains. Although not shown, the upper and lower portions of the first intermediate product 7 may be slightly thinner toward the ends.

【００２４】第２プレス工程での第２固定金型１０と第
２押し金型１１は各々、アイ形ジョイントＡの外径Ｄに
等しい内径の短円柱状孔１２と、その奥部に奥端寄りほ
ど小径の円錐台状孔１４を有する。この第２固定金型１
０と第２押し金型１１でプレスすることで、第１中間製
品７の下部寄りと上部寄り部分に、中心線Ｘ方向へ傾い
た断面テーパ状部１７，１８をもつ第２中間製品１６を
形成する（図５ないし図７参照）。In the second pressing step, the second stationary mold 10 and the second pressing mold 11 are each provided with a short cylindrical hole 12 having an inner diameter equal to the outer diameter D of the eye-shaped joint A, and a rear end at the back. It has a truncated conical hole 14 with a smaller diameter as it gets closer. This second fixed mold 1
The second intermediate product 16 having tapered sections 17 and 18 inclined in the direction of the center line X at the lower and upper portions of the first intermediate product 7 by pressing the first intermediate product 7 with the second pressing die 11. (See FIGS. 5 to 7).

【００２５】この第２プレス工程で用いる第２固定金型
１０と第２押し金型１１で、その各円錐台状孔１４，１
５における傾斜周面は、中心線Ｘに対して４０ないし６
０度程度の角度、換言すれば水平面に対して３０ないし
５０度程度の角度にしておくのがよいが、必ずしもこれ
に限らない（図５参照）。またこの第２固定金型１０
も、第２押し金型１１が離脱後に第２中間製品１６が残
るように、第２押し金型１１よりもやや深めに形成して
ある。３９は第２中間製品押出し棒を示す。The second stationary die 10 and the second pressing die 11 used in the second pressing step are used to form the respective truncated conical holes 14, 1.
5 has a slope of 40 to 6 with respect to the center line X.
It is preferable to set the angle to about 0 degree, in other words, about 30 to 50 degrees with respect to the horizontal plane, but it is not necessarily limited to this (see FIG. 5). Also, the second fixed mold 10
Also, the second pressing die 11 is formed slightly deeper than the second pressing die 11 so that the second intermediate product 16 remains after the second pressing die 11 is detached. Reference numeral 39 denotes a second intermediate product push rod.

【００２６】第３プレス工程での第３固定金型１９は、
アイ形ジョイントＡの外径Ｄと高さＨに等しい外径と深
さの短円柱状孔２１を有し、第３押し金型２０は中心線
Ｘと直交する平板状の押し面２２を有する（図８参
照）。この第３固定金型１９と第３押し金型２０でプレ
スすることで、第２中間製品１６の中心線方向へ傾いた
上部寄りと下部寄り部分をさらに屈曲させて、中心線Ｘ
に直交する平面をもつ中央孔付き円板状部２３，２４を
形成する（図９参照）。上記第３固定金型１９の底面４
０と第３押し金型２０の下の押し面２２とで、中心線Ｘ
に対して直交する中央孔付き円板状部２３，２４を形成
させている。In the third pressing step, the third fixed mold 19 is
It has a short cylindrical hole 21 having an outer diameter and depth equal to the outer diameter D and height H of the eye-shaped joint A, and the third pressing mold 20 has a flat pressing surface 22 orthogonal to the center line X. (See FIG. 8). By pressing with the third fixed mold 19 and the third pressing mold 20, the upper and lower portions of the second intermediate product 16 inclined toward the center line are further bent, and the center line X
The disk-shaped portions 23, 24 with a central hole having a plane perpendicular to the plane are formed (see FIG. 9). The bottom surface 4 of the third fixed mold 19
0 and the pressing surface 22 below the third pressing mold 20, the center line X
The disk-shaped portions 23, 24 with a central hole are formed perpendicular to.

【００２７】さらに第３プレス工程では、上記の中心線
Ｘに直交する中央孔付き円板状部２３，２４の中央孔２
５，２６に、外径がアイ形ジョイントＡの内周端縁２
７，２８の内径ｄに等しい中央孔補正棒２９を圧入させ
て、所定の内径の各内周端縁３１，３２をもつ第３中間
製品３０を形成する。この中央孔補正棒２９は、やや大
径の第３中間製品押出し棒４２の上部寄り部分に形成し
てある（図１０参照）。Further, in the third pressing step, the center holes 2 of the disk-shaped portions 23, 24 having the center holes orthogonal to the center line X are formed.
5 and 26, the outer diameter of the inner peripheral edge 2 of the eye joint A
The third intermediate product 30 having the inner peripheral edges 31 and 32 having a predetermined inner diameter is formed by press-fitting the center hole correction rod 29 equal to the inner diameter d of each of the inner and outer diameters 7 and 28. The center hole correcting rod 29 is formed at a portion near the upper part of the third intermediate product pushing rod 42 having a slightly larger diameter (see FIG. 10).

【００２８】その後のパイプ接続工程は、上記第３中間
製品３０の側周部３３の一部に通孔３４を穿設した後
に、該通孔３４に接続パイプ３５を溶着するものであり
（図１２参照）。このようにして製造されたアイ型ジョ
イントＡを使用した例を、図１３で示してある。なお図
において、４３はタンク部、４４はネジ孔、４５はシー
ル材、４６は締付けボルト、４７は通孔、４８は配管を
各々示す。In the subsequent pipe connecting step, after a through hole 34 is formed in a part of the side peripheral portion 33 of the third intermediate product 30, a connecting pipe 35 is welded to the through hole 34 (FIG. 2). 12). FIG. 13 shows an example in which the eye joint A manufactured as described above is used. In the drawing, 43 is a tank portion, 44 is a screw hole, 45 is a sealing material, 46 is a fastening bolt, 47 is a through hole, and 48 is a pipe.

【００２９】[0029]

【発明の効果】以上で明らかな如く、本発明に係るアイ
形ジョイントの製造方法は、材料の無駄を無くすことが
できるとともに、プレス加工だけの高精度な仕上がりで
切削仕上げ加工を不要にでき、生産効率も向上できるこ
とによって、大幅にコストダウンを図ることができる。As is clear from the above, the method for manufacturing an eye-shaped joint according to the present invention can eliminate waste of material, and can eliminate the need for cutting and finishing with a high-precision finish only by press working. Since the production efficiency can be improved, the cost can be significantly reduced.

【００３０】即ち、従来のアイ形ジョイントを製造方法
の内で、鋳造で成形した後に切削仕上げする方法は、内
部に巣が生じ易いしその後の切削仕上げが難しく、また
丸棒材を冷間鍛造して成形した後に切削仕上げする方法
は、コストが高くつくし切削仕上げする必要があった。
また金属の平板条材から切削にて製造する方法は、切削
除去する部分が非常に多く材料費が非常に不経済であ
り、切削加工に数種類の単能機・専用機・自動機等が必
要で、加工費も高くついていた。That is, in the conventional method of manufacturing an eye-shaped joint, the method of cutting and finishing after forming by casting is such that nests are easily formed in the inside and the subsequent cutting is difficult, and the round bar is cold forged. The method of cutting and finishing after forming is costly and requires cutting.
In addition, the method of manufacturing by cutting from metal flat strips requires a lot of parts to be cut and removed, which is extremely uneconomical, and requires several types of single-purpose machines, special-purpose machines, and automatic machines for cutting. The processing cost was high.

【００３１】これに対して本発明に係るアイ形ジョイン
トの製造方法は、上記の如く素材は製品であるアイ形ジ
ョイントとほぼ等しい外径と内径で、かつアイ形ジョイ
ントの高さに応じ所定の長さに切断した短円筒状の金属
パイプ製の素管を用いるものであり、体積を変えること
無くアイ形ジョイントが成形されるので、材料が無駄に
ならずコストを大幅に低減できる。On the other hand, in the method of manufacturing an eye-shaped joint according to the present invention, as described above, the material is an outer diameter and an inner diameter substantially equal to the eye-shaped joint, which is a product, and a predetermined value is determined according to the height of the eye-shaped joint. It uses a short cylindrical metal pipe cut into a length, and the eye-shaped joint is formed without changing the volume, so that the material is not wasted and the cost can be greatly reduced.

【００３２】また、第１プレス工程で素管の各端縁に凸
曲面状部を形成しているため、第３プレス工程で中央孔
補正棒の圧入をスムーズに行うことができ、かつ該各中
央孔の内周端縁を補正棒の外周面に沿って高精度に内周
面を形成できる。また第２プレス工程で中心線方向へ傾
いた断面テーパ状部を形成しているため、第３プレス工
程で中央孔付き円板状部を形成する際に、無理なくスム
ーズに内方へ折れ曲がり、中心線に直交する中央孔付き
円板状部を、精度良く形成することができる。Further, since the convex-curved portions are formed at the respective edges of the raw tube in the first pressing step, the press-fitting of the center hole correction rod can be smoothly performed in the third pressing step. The inner peripheral edge of the central hole can be formed with high precision along the outer peripheral surface of the correction rod. In addition, since the cross-section tapered portion inclined in the center line direction is formed in the second pressing process, when forming the disc-shaped portion with the center hole in the third pressing process, it bends smoothly and inward without difficulty, A disk-shaped portion with a central hole orthogonal to the center line can be formed with high accuracy.

【００３３】上記の如く最後のパイプ接続工程を除け
ば、短円筒形の素管から単にプレス工程だけで、所定の
形状・寸法のアイ形ジョイントを製造することができる
のであり、従来と異なり切削により仕上げ加工の必要が
ない。そのため、生産効率も向上できるとともに、製造
コストを大幅にダウンさせることができるものである。Except for the final pipe connection step as described above, an eye-shaped joint having a predetermined shape and dimensions can be manufactured from a short cylindrical pipe simply by a pressing step. There is no need for finishing. Therefore, the production efficiency can be improved, and the production cost can be significantly reduced.

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

【図１】本発明に係るアイ形ジョイントの製造方法の実
施例で用いる素材としての素管の縦断正面図である。FIG. 1 is a longitudinal sectional front view of a raw pipe as a raw material used in an embodiment of a method of manufacturing an eye-shaped joint according to the present invention.

【図２】図１で示した素管を第１プレス工程でプレス前
の縦断正面図である。FIG. 2 is a longitudinal sectional front view of the raw tube shown in FIG. 1 before being pressed in a first pressing step.

【図３】第１プレス工程でプレス時の縦断正面図であ
る。FIG. 3 is a vertical sectional front view at the time of pressing in a first pressing step.

【図４】第１中間製品の縦断正面図である。FIG. 4 is a vertical sectional front view of a first intermediate product.

【図５】図４で示した第１中間製品を第２プレス工程で
プレス前の縦断正面図である。5 is a vertical sectional front view of the first intermediate product shown in FIG. 4 before being pressed in a second pressing step.

【図６】第２プレス工程でプレス時の縦断正面図であ
る。FIG. 6 is a vertical sectional front view at the time of pressing in a second pressing step.

【図７】第２中間製品の一部縦断正面図である。FIG. 7 is a partial longitudinal front view of a second intermediate product.

【図８】図７で示した第２中間製品を第３プレス工程で
プレス前の縦断正面図である。8 is a vertical sectional front view of the second intermediate product shown in FIG. 7 before being pressed in a third pressing step.

【図９】第３プレス工程でプレス時の縦断正面図であ
る。FIG. 9 is a vertical sectional front view at the time of pressing in a third pressing step.

【図１０】第３プレス工程で中央孔補正棒を圧入時の縦
断正面図である。FIG. 10 is a longitudinal sectional front view when a central hole correction rod is pressed in a third pressing step.

【図１１】第３中間製品の縦断正面図である。FIG. 11 is a vertical sectional front view of a third intermediate product.

【図１２】アイ形ジョイントの一部切り欠き正面図であ
る。FIG. 12 is a partially cutaway front view of the eye joint.

【図１３】アイ形ジョイントの使用状態を示す一部切り
欠き正面図である。FIG. 13 is a partially cutaway front view showing a use state of the eye joint.

【図１４】アイ形ジョイントの平面図である。FIG. 14 is a plan view of an eye joint.

【符号の説明】[Explanation of symbols]

Ａ−アイ形ジョイント ａ−素管 １−第１固定金型 ２−第２押し金型 ３−環状凹溝 ４−環状凹溝 ５−凹曲面部 ６−凹曲面部 ７−第１中間製品 ８−凸曲面部 ９−凸曲面部 １０−第２固定金型 １１−第２押し金型 １２−短円柱状孔 １３−短円柱状孔 １４−円錐台状孔 １５−円錐台状孔 １６−第２中間製品 １７−断面テーパ状部 １８−断面テーパ状部 １９−第３固定金型 ２０−第３押し金型 ２１−短円柱状孔 ２２−押し面 ２３−中央孔付き円板状部 ２４−中央孔付き円板状
部 ２５−中央孔 ２６−中央孔 ２７−円周端縁 ２８−円周端縁 ２９−中央孔補正棒 ３０−第３中間製品 ３１−内周端縁 ３２−内周端縁 ３３−側周部 ３４−通孔 ３５−接続パイプ ３６−バリ ３７−内金型 ３８−第１中間製品押出
し棒 ３９−第２中間製品押出し棒 ４０−底面 ４２−第３中間製品押出し棒 ４３−タンク部 ４４−ネジ孔 ４５−シール材 ４６−締付けボルト ４７−通孔 ４８−配管 Ｄ−外径 ｄ−内径 Ｈ−高さ Ｘ−中心線A-eye joint a-base tube 1-first fixed mold 2-second press mold 3-circular concave groove 4-cyclic concave groove 5-concave curved surface portion 6-concave curved surface portion 7-first intermediate product 8 -Convex curved surface portion 9-convex curved surface portion 10-second fixed mold 11-second pressing mold 12-short cylindrical hole 13-short cylindrical hole 14-frustoconical hole 15-frustoconical hole 16-first 2 Intermediate product 17-tapered section 18-tapered section 19-third fixed die 20-third pressing die 21-short cylindrical hole 22-pressing surface 23-disc part with central hole 24- Disc-shaped part with center hole 25-Center hole 26-Center hole 27-Circumference edge 28-Circumference edge 29-Central hole correction rod 30-Third intermediate product 31-Inner edge 32-Inner edge Rim 33-side peripheral part 34-through hole 35-connection pipe 36-burr 37-inner die 38-first intermediate product push rod 39-second intermediate product pusher Extension rod 40-Bottom surface 42-Third intermediate product push rod 43-Tank 44-Screw hole 45-Seal material 46-Clamp bolt 47-Through hole 48-Piping D-Outer diameter d-Inner diameter H-Height X-Center line

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】製品であるアイ形ジョイントＡとほぼ等し
い外径で、その高さに応じて所定の長さに切断した金属
パイプ製の素管ａを、三段階のプレス工程とパイプ接続
工程を経てアイ形ジョイントＡに形成するものであり、 第１プレス工程では、上記金属パイプ製の素管ａを、該
素管ａの厚みと等しい間隙の環状凹溝３，４で、その各
奥端に凹曲面部５，６を各々有する第１固定金型１と第
１押し金型２とでプレスして、素管ａの各端縁に凸曲面
部８，９をもつ第１中間製品７を形成し、 第２プレス工程では、上記第１中間製品７を、アイ形ジ
ョイントＡの外径Ｄと等しい内径の短円柱状孔１２，１
３で、その各奥部に奥端寄りほど小径の円錐台状孔１
４，１５を各々有する第２固定金型１０と第２押し金型
１１とでプレスして、第１中間製品７の下寄り部分と上
寄り部分とに、中心線方向へ傾いた断面テーパ状部１
７，１８をもつ第２中間製品１６を形成し、 第３プレス工程では、上記第２中間製品１６を、アイ形
ジョイントＡの外径Ｄと高さＨに等しい外径と深さの短
円柱状孔２１をもつ第３固定金型１９と、平板状の押し
面２２をもつ第３押し金型２０とでプレスして、第２中
間製品１６の下寄り部分と上寄り部分を、中心線Ｘに直
交する平面をもつ中央孔付き円板状部２３，２４に形成
し、かつ各中央孔２５，２６に、外径がアイ形ジョイン
トＡの内周端縁２７，２８の各内径ｄに等しい中央孔補
正棒２９を圧入して、所定の内径の内周端縁３１，３２
をもつ第３中間製品３０を形成し、 パイプ接続工程では、上記第３中間製品３０の側周部３
３の一部に通孔３４を形成した後に、該通孔３４に接続
パイプ３５を固着するようにした、アイ形ジョイントの
製造方法。1. A metal pipe blank a having an outer diameter substantially equal to that of a product eye-shaped joint A and cut to a predetermined length in accordance with the height thereof, is subjected to a three-stage pressing step and a pipe connecting step. In the first pressing step, the base pipe a made of a metal pipe is formed by annular concave grooves 3 and 4 having a gap equal to the thickness of the base pipe a in the first pressing step. The first intermediate product having the convex curved surface portions 8 and 9 at each edge of the base tube a is pressed by the first fixed die 1 and the first pressing die 2 each having the concave curved surface portions 5 and 6 at the ends. In the second pressing step, the first intermediate product 7 is inserted into the short cylindrical holes 12, 1 having an inner diameter equal to the outer diameter D of the eye-shaped joint A.
3, a truncated conical hole 1 having a smaller diameter toward the far end in each deep portion thereof.
Pressed by the second fixed mold 10 and the second pressing mold 11 each having the first and fourth molds 4 and 15, the lower part and the upper part of the first intermediate product 7 are tapered in cross section inclined in the center line direction. Part 1
In the third pressing step, the second intermediate product 16 having the outer diameter D equal to the outer diameter D of the eye-shaped joint A and a short circle having a depth equal to the height H is formed. The lower part and the upper part of the second intermediate product 16 are pressed by a third fixed die 19 having a columnar hole 21 and a third pressed die 20 having a flat pressing surface 22 so that the center line is formed. It is formed in the disc-shaped portions 23, 24 having a center hole having a plane orthogonal to X, and the outer diameter of each of the center holes 25, 26 is equal to the inner diameter d of the inner peripheral edge 27, 28 of the eye joint A. An equal center hole correction rod 29 is press-fitted and inner peripheral edges 31 and 32 having a predetermined inner diameter.
In the pipe connecting step, the side peripheral portion 3 of the third intermediate product 30 is formed.
3. A method of manufacturing an eye-shaped joint, wherein a connection pipe 35 is fixed to a through hole 34 after forming the through hole 34 in a part of the third joint 3.