JP3114918B2 - Manufacturing method of curved hollow pipe - Google Patents
Manufacturing method of curved hollow pipeInfo
- Publication number
- JP3114918B2 JP3114918B2 JP07313871A JP31387195A JP3114918B2 JP 3114918 B2 JP3114918 B2 JP 3114918B2 JP 07313871 A JP07313871 A JP 07313871A JP 31387195 A JP31387195 A JP 31387195A JP 3114918 B2 JP3114918 B2 JP 3114918B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow pipe
- curved
- bent
- curved hollow
- mold
- 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 - Fee Related
Links
Landscapes
- Vehicle Body Suspensions (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は湾曲中空パイプの製
造方法に関する。この製造方法は例えばサスペンション
アームの製造方法に供して好適である。[0001] The present invention relates to a method of manufacturing a curved hollow pipe. This manufacturing method is suitable for use in, for example, a method for manufacturing a suspension arm.
【０００２】[0002]
【従来の技術】従来、特開昭６３−２７８６１４号公報
に湾曲中空パイプの製造方法が開示されている。この製
造方法では、まず縦方向及び横方向に延在する平板を高
さ方向からプレス加工することにより、縦方向と高さ方
向とがなす平面内で湾曲し、かつ横方向と高さ方向とが
なす平面内の両鍔部が高さ方向の下方にそれぞれ延在さ
れた断面山形状の粗形材を得る。そして、粗形材を高さ
方向からプレス加工することにより、両鍔部が互いに近
づく方向に屈曲された屈曲粗形材を得る。この後、複数
の分割中子をリンクにより屈伸可能に連結してなる中子
を屈曲粗形材内に入れ、この状態で両鍔部の寄せ曲げを
行なうことにより、両鍔部が互いに当接された湾曲中空
パイプを得る。得られた湾曲中空パイプ内から中子を抜
き出す場合には、各分割中子を屈伸させつつ中空の開口
側から順次抜き取ることを行なう。2. Description of the Related Art A method of manufacturing a curved hollow pipe has been disclosed in Japanese Patent Application Laid-Open No. 63-278614. In this manufacturing method, first, a flat plate extending in the vertical direction and the horizontal direction is pressed in the height direction, thereby being curved in a plane formed by the vertical direction and the height direction, and in the horizontal direction and the height direction. A rough material having a mountain-shaped cross section is obtained in which both flange portions in a plane formed by the respective members extend downward in the height direction. Then, the rough shaped material is pressed from the height direction to obtain a bent rough shaped material in which both flange portions are bent in a direction approaching each other. Thereafter, a core formed by connecting a plurality of divided cores so as to be able to bend and extend by a link is put into a bent rough material, and the both flanges are brought into contact with each other by bending the both flanges in this state. Obtained curved hollow pipe. When extracting a core from the inside of the obtained curved hollow pipe, each of the divided cores is sequentially extracted from the hollow opening side while bending and extending.
【０００３】こうして得られる湾曲中空パイプは、中空
のサスペンションアームとして、近年、軽量化が行われ
ている車両に採用可能である。[0003] The curved hollow pipe thus obtained can be used as a hollow suspension arm in a vehicle whose weight has been reduced in recent years.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来の製
造方法では、中子を開口側から抜き取らなければならな
いため、断面が異形の湾曲中空パイプを製造できない。
また、この製造方法では、複数の分割中子を屈伸可能に
連結してなる部品点数の多い中子を採用しなければなら
ず、かつこの中子を屈曲粗形材内に入れた後に湾曲中空
パイプ内から抜き出すための出し入れ機構をも要するた
め、複雑な設備により製造コストの高騰化を招来してし
まう。However, in the above-mentioned conventional manufacturing method, the core must be removed from the opening side, so that it is not possible to manufacture a curved hollow pipe having an irregular cross section.
Further, in this manufacturing method, a core having a large number of parts formed by connecting a plurality of divided cores so as to be able to bend and stretch must be employed, and after the core is placed in a bent coarse shaped material, a curved hollow is formed. Since a mechanism for taking in and out from the pipe is also required, complicated equipment causes an increase in manufacturing cost.
【０００５】特に、上記従来の製造方法では、まず両鍔
部を高さ方向の下方にそれぞれ延在させることとしてい
るため、湾曲中空パイプを複雑に湾曲しにくい。そし
て、この場合、中子を複雑なリンクで連結しなければな
らない。このため、中子が大型化し、開口から中子をよ
り一層抜き取りにくいことになる。また、これにより中
子及び出し入れ機構がより複雑化し、製造コストのより
一層の高騰化を招来してしまう。[0005] In particular, in the above-mentioned conventional manufacturing method, since the first and second flange portions are respectively extended downward in the height direction, the curved hollow pipe is hardly bent in a complicated manner. In this case, the cores must be connected by complicated links. For this reason, the core becomes large and it becomes more difficult to remove the core from the opening. In addition, this makes the core and the loading / unloading mechanism more complicated, which leads to a further increase in manufacturing cost.
【０００６】本発明は、上記従来の実情に鑑みてなされ
たものであって、湾曲中空パイプが複雑に湾曲している
ものであっても、その湾曲中空パイプを断面形状に制限
なく、安価に製造可能な製造方法を提供することを課題
とする。The present invention has been made in view of the above-mentioned conventional circumstances, and even if a curved hollow pipe is complicatedly curved, the curved hollow pipe is not limited in cross-sectional shape and is inexpensive. It is an object to provide a manufacturing method that can be manufactured.
【０００７】[0007]
【課題を解決するための手段】請求項１の湾曲中空パイ
プの製造方法は、第１方向及び該第１方向と直交する第
２方向に延在する平板を該第１方向及び該第２方向と直
交する第３方向からプレス加工することにより、該第１
方向と該第３方向とがなす平面内で湾曲し、かつ該第２
方向と該第３方向とがなす平面内の両鍔部が互いに遠ざ
かる方向に延在された断面山形状の粗形材を得る粗成形
工程と、該粗形材を該第３方向からプレス加工すること
により、該両鍔部が該第３方向と略平行に屈曲された断
面山形状の屈曲粗形材を得る屈曲工程と、該屈曲粗形材
を該第３方向からプレス加工することにより、該両鍔部
を成形型の凹部に案内させつつ他の部位を該成形型で拘
束し、該両鍔部を互いに当接させた湾曲中空パイプを得
る当接工程と、を有することを特徴とする。According to a first aspect of the present invention, there is provided a method for manufacturing a curved hollow pipe, comprising: forming a flat plate extending in a first direction and a second direction orthogonal to the first direction in the first direction and the second direction. Press working from a third direction orthogonal to
Direction in the plane formed by the third direction and the third direction, and the second direction
Forming process of obtaining a rough shaped material having a mountain-shaped cross section in which both flange portions in a plane formed by the direction and the third direction extend in a direction away from each other, and pressing the rough shaped material from the third direction A bending step of obtaining a bent coarse shaped material having a mountain-like cross section in which both flange portions are bent substantially parallel to the third direction, and pressing the bent rough shaped material from the third direction. Contacting the two flanges with the recesses of the molding die while guiding the two flanges to the recesses of the molding die to obtain a curved hollow pipe in which the two flanges are in contact with each other. And
【０００８】請求項１の製造方法では、まず粗成形工程
として、平板を第３方向からプレス加工する。これによ
り、第１方向と第３方向とがなす平面内で湾曲し、かつ
第２方向と第３方向とがなす平面内の両鍔部が互いに遠
ざかる方向に延在された断面山形状の粗形材を得る。こ
のとき、両鍔部が成形型に挟持されることから、他の部
位が変形しやすいため、従来のように両鍔部を第３方向
にそれぞれ延在させている場合よりも、複雑な湾曲形状
の付与が可能である。According to the manufacturing method of the first aspect, first, as a rough forming step, a flat plate is pressed from a third direction. Accordingly, a rough section having a mountain-shaped cross section that curves in a plane formed by the first direction and the third direction and extends in a direction in which both flange portions in a plane formed by the second direction and the third direction are away from each other. Obtain a profile. At this time, since the two flanges are sandwiched by the molding die, the other parts are easily deformed. Therefore, a more complicated bending than in the case where the both flanges are extended in the third direction as in the related art. It is possible to give a shape.
【０００９】そして、屈曲工程として、粗形材を第３方
向からプレス加工する。これにより、両鍔部が第３方向
と略平行に屈曲された断面山形状の屈曲粗形材を得る。
このとき、湾曲形状は粗成形工程において既に付与され
ているため、粗形材が複雑な湾曲形状を有していても、
両鍔部の変形が容易である。この後、従来のように両鍔
部を互いに近づく方向に屈曲させることが最終的な両鍔
部の当接のために好ましい。Then, as a bending step, the rough material is pressed from a third direction. Thereby, a bent rough shaped material having a mountain-shaped cross section in which both flange portions are bent substantially parallel to the third direction is obtained.
At this time, since the curved shape has already been given in the rough forming step, even if the rough material has a complicated curved shape,
Both flanges can be easily deformed. After that, it is preferable to bend the two flanges in a direction approaching each other as in the related art, for the final abutment of the two flanges.
【００１０】次いで、当接工程として、屈曲粗形材を第
３方向からプレス加工する。これにより、両鍔部を成形
型の凹部に案内させつつ他の部位をその成形型で拘束
し、両鍔部を互いに当接させた湾曲中空パイプを得る。
したがって、この製造方法では、中子を採用することな
く複雑に湾曲した湾曲中空パイプを製造できる。これに
より得られる湾曲中空パイプは、全てプレス加工により
成形されていることから、中子を採用するような制限が
断面形状にない。また、湾曲中空パイプの製造に際し
て、部品点数の削減と、出し入れ機構の省略とが実現さ
れ、比較的簡易な成形型による同一方向からのプレス加
工を行えば足りるため、湾曲中空パイプの製造コストの
低廉化が実現される。Next, as a contacting step, the bent rough material is pressed from a third direction. In this way, a curved hollow pipe is obtained in which the flanges are guided into the recesses of the mold while the other parts are restrained by the mold, and the flanges are brought into contact with each other.
Therefore, according to this manufacturing method, it is possible to manufacture a complicatedly curved hollow pipe without employing a core. Since the curved hollow pipe obtained by this is all formed by press working, there is no limitation in the cross-sectional shape such as employing a core. Also, when manufacturing a curved hollow pipe, the number of parts can be reduced and the insertion / removal mechanism can be omitted, and press work from the same direction with a relatively simple mold is sufficient. Cost reduction is realized.
【００１１】[0011]
【発明の実施の形態】以下、請求項１の発明を具体化し
た実施形態を図面を参照しつつ説明する。この実施形態
では、図１に示す湾曲中空パイプＰを製造する。この湾
曲中空パイプＰは湾曲軸線Ｓに沿った形状をなしてい
る。湾曲軸線Ｓは、一端側の開口Ｐａから他端側の開口
Ｐｂまでで説明すれば、直線ｌ方向に延在した後、直線
ｌより上方のＯ1 を中心とした曲率Ｒ1 に屈曲され、段
差ｅを有して直線ｌより上方のＯ 2 を中心とした曲率Ｒ
2 に屈曲され、直線ｌと平行な直線ｌ’に対してθだけ
傾斜されている。また、この湾曲中空パイプＰの断面形
状は、曲率Ｒ1 をもつ位置Ａから開口Ｐａまでが直径φ
Ｄの真円形であり、曲率Ｒ1 をもつ位置Ａから曲率Ｒ2
をもつ位置Ｂまでが徐々に変形され、曲率Ｒ2 をもつ位
置Ｂから開口Ｐｂまでが横幅Ｗ1 、縦幅Ｗ2 （Ｗ1 ＞Ｗ
2 ）の矩形をしている。BEST MODE FOR CARRYING OUT THE INVENTION
The embodiment will be described with reference to the drawings. This embodiment
Then, the curved hollow pipe P shown in FIG. 1 is manufactured. This bay
The curved hollow pipe P has a shape along the curved axis S.
You. The bending axis S extends from the opening Pa on one end to the opening on the other end.
Explaining up to Pb, after extending in the straight line l direction,
O above l1Curvature R centered on1Bent into a step
O above line l with difference e TwoCurvature R centered on
TwoAnd a straight line l ′ parallel to the straight line l is θ
It is inclined. Also, the cross-sectional shape of this curved hollow pipe P
The shape is curvature R1From the position A with the opening Pa to the diameter φ
D is a perfect circle and the curvature is R1From position A with curvature RTwo
Is gradually deformed to a position B having a curvature RTwoRank with
The width W from the position B to the opening Pb1, Vertical width WTwo(W1> W
Two) Has a rectangular shape.
【００１２】「粗成形工程」まず、図２に示すように、
座標軸上に第１方向（縦方向）としてｘ方向、ｘ方向と
直交する第２方向（横方向）としてｙ方向、そしてｘ方
向及びｙ方向と直交する第３方向（高さ方向）としてｚ
方向を定める。また、ｘ方向及びｙ方向に延在する鋼板
製の平板Ｐ0 を用意する。"Rough forming step" First, as shown in FIG.
On a coordinate axis, an x direction as a first direction (longitudinal direction), a y direction as a second direction (horizontal direction) orthogonal to the x direction, and z as a third direction (height direction) orthogonal to the x and y directions.
Determine the direction. Further, providing a flat plate P 0 of steel plate extending in the x and y directions.
【００１３】一方、図３及び図４に示すように、第１下
型１と第１上型２とからなる第１成形型３を用意する。
第１下型１の上面１ａはｙ方向と平行に形成されてお
り、上面１ａには、ｘ方向とｚ方向とがなす平面内で湾
曲軸線Ｓに沿って湾曲し、かつｙ方向とｚ方向とがなす
平面内で断面山形状の凸部１ｂが突設されている。ま
た、第１上型２の下面２ａもｙ方向と平行に形成されて
おり、この下面２ａには第１下型１の凸部１ｂと整合す
る凹部２ｂが凹設されている。第１上型２の下面２ａ及
び凹部２ｂは、第１上型２の下死点位置において、第１
下型１の上面１ａ及び凸部１ｂと平板Ｐ0 のほぼ厚さ分
だけ平行に隔てられるようになっている。On the other hand, as shown in FIGS. 3 and 4, a first molding die 3 including a first lower die 1 and a first upper die 2 is prepared.
The upper surface 1a of the first lower mold 1 is formed in parallel with the y direction. The upper surface 1a is curved along the bending axis S in a plane formed by the x direction and the z direction, and is also formed in the y direction and the z direction. A convex portion 1b having a mountain-shaped cross section protrudes in a plane formed by the two. The lower surface 2a of the first upper die 2 is also formed in parallel with the y direction, and the lower surface 2a is provided with a concave portion 2b that matches the convex portion 1b of the first lower die 1. The lower surface 2a and the concave portion 2b of the first upper die 2 are located at the bottom dead center position of the first upper die 2,
Only approximately the thickness of the upper surface 1a and the projection 1b and the flat plate P 0 of the lower mold 1 is adapted to be spaced in parallel.
【００１４】そして、第１成形型３の第１下型１と第１
上型２との間に平板Ｐ0 を載置し、第１上型２を下死点
まで下降させて平板Ｐ0 をｚ方向からプレス加工する。
これにより、平板Ｐ0 は、湾曲軸線Ｓに沿って湾曲し、
かつｙ方向とｚ方向とがなす平面内の両鍔部Ｅ1 、Ｅ2
が互いに遠ざかる方向に延在された断面山形状の粗形材
Ｐ1 に成形される。このとき、両鍔部Ｅ1 、Ｅ2 が第１
下型１の上面１ａと第１上型２の下面２ａとに挟持され
ることから、他の部位が変形しやすいため、従来のよう
に両鍔部を第３方向にそれぞれ延在させている場合より
も、複雑な湾曲形状の付与が可能である。Then, the first lower mold 1 and the first lower mold 1 of the first molding die 3
The flat plate P 0 is placed between the upper die 2 and the first upper die 2 is lowered to the bottom dead center, and the flat plate P 0 is pressed from the z direction.
Thereby, the flat plate P 0 bends along the bending axis S,
And both flange portions E 1 , E 2 in a plane defined by the y direction and the z direction.
There are formed in the cross-sectional mountain shape coarse profile P 1 that extends in a direction away from each other. At this time, both flange portions E 1 and E 2 are in the first position.
Since the lower portion 1 is sandwiched between the upper surface 1a of the lower die 1 and the lower surface 2a of the first upper die 2, the other portions are easily deformed. Therefore, both flange portions extend in the third direction as in the related art. It is possible to provide a more complicated curved shape than in the case.
【００１５】「屈曲工程」次いで、図５及び図６に示す
ように、第２下型４と第２上型５とからなる第２成形型
６を用意する。第２下型４の上面４ａはｙ方向と平行に
形成されており、上面４ａには、ｘ方向とｚ方向とがな
す平面内で湾曲軸線Ｓに沿って湾曲し、かつｙ方向とｚ
方向とがなす平面内で断面山形状の凸部４ｂが突設され
ている。また、第２上型５の下面５ａもｙ方向と平行に
形成されており、下面５ａには凸部４ｂと整合する凹部
５ｂが凹設されている。第２下型４の凸部４ｂ及び第２
上型５の凹部５ｂは、第２上型５の下死点位置におい
て、粗形材Ｐ1 の両鍔部Ｅ1 、Ｅ2 が第２下型４の上面
４ａから離反するべく、上記第１下型１の凸部１ｂ及び
第１上型２の凹部２ｂよりｚ方向に大きく形成されてい
る。[Bending Step] Next, as shown in FIGS. 5 and 6, a second molding die 6 including a second lower die 4 and a second upper die 5 is prepared. The upper surface 4a of the second lower mold 4 is formed parallel to the y direction. The upper surface 4a is curved along the bending axis S in a plane formed by the x direction and the z direction, and
A convex portion 4b having a mountain-shaped cross section protrudes in a plane defined by the directions. The lower surface 5a of the second upper die 5 is also formed in parallel with the y direction, and the lower surface 5a is provided with a concave portion 5b that matches the convex portion 4b. The convex portion 4b of the second lower mold 4 and the second
The concave portion 5b of the upper mold 5 is provided with the second upper mold 5 at the bottom dead center position so that both the flange portions E 1 and E 2 of the coarse material P 1 are separated from the upper surface 4a of the second lower mold 4. The protrusions 1 b of the lower mold 1 and the recesses 2 b of the first upper mold 2 are formed larger in the z direction.
【００１６】そして、第２成形型６の第２下型４と第２
上型５との間に粗形材Ｐ1 を載置し、第２上型５を下死
点まで下降させて粗形材Ｐ1 をｚ方向からプレス加工す
る。これにより、粗形材Ｐ1 は、両鍔部Ｅ1 、Ｅ2 が第
２下型４の凸部４ｂと第２上型５の凹部５ｂとに挟持さ
れてｚ方向と略平行に屈曲され、第１屈曲粗形材Ｐ2に
成形される。The second lower mold 4 and the second lower mold 4
Placing the Sokatachizai P 1 between the upper die 5, the coarse profile P 1 lowers the second upper die 5 to the bottom dead center pressing the z-direction. As a result, the rough shaped material P 1 is bent substantially parallel to the z direction, with the both flange portions E 1 and E 2 sandwiched between the convex portion 4b of the second lower die 4 and the concave portion 5b of the second upper die 5. It is formed into the first bent roughness profile P 2.
【００１７】この後、図７及び図８に示すように、第３
下型７と第３上型８とからなる第３成形型９を用意す
る。第３下型７の上面７ａはｙ方向と平行に形成されて
おり、上面７ａには、ｘ方向とｚ方向とがなす平面内で
湾曲軸線Ｓに沿って湾曲し、かつｙ方向とｚ方向とがな
す平面内で断面山形状の凸部７ｂが突設されている。ま
た、第３上型８の下面８ａもｙ方向と平行に形成されて
おり、下面８ａには凸部７ｂと整合する凹部８ｂが凹設
されている。第３上型８の凹部８ｂは上記第２上型５の
凹部５ｂよりもｙ方向で小さな曲率に形成されており、
第３下型７の凸部７ｂは上記第２下型４の凸部４ｂより
もｙ方向で幅狭に形成されている。また、第３上型８の
下死点位置において、第３下型７の上面７ａと第３上型
８の下面８ａとの間には間隙Ｃが確保されるようになっ
ている。Thereafter, as shown in FIG. 7 and FIG.
A third mold 9 including a lower mold 7 and a third upper mold 8 is prepared. The upper surface 7a of the third lower mold 7 is formed in parallel with the y direction. The upper surface 7a is curved along the bending axis S in a plane formed by the x direction and the z direction, and is curved in the y direction and the z direction. A convex portion 7b having a mountain-shaped cross section protrudes in a plane formed by the two. The lower surface 8a of the third upper die 8 is also formed in parallel with the y direction, and the lower surface 8a is provided with a concave portion 8b that matches the convex portion 7b. The concave portion 8b of the third upper die 8 is formed to have a smaller curvature in the y direction than the concave portion 5b of the second upper die 5,
The convex portion 7b of the third lower die 7 is formed to be narrower in the y direction than the convex portion 4b of the second lower die 4. At the bottom dead center position of the third upper die 8, a gap C is secured between the upper surface 7a of the third lower die 7 and the lower surface 8a of the third upper die 8.
【００１８】そして、第３成形型９の第３下型７と第３
上型８との間に第１屈曲粗形材Ｐ2を載置し、第３上型
８を下死点まで下降させて第１屈曲粗形材Ｐ2 をｚ方向
からプレス加工する。これにより、第１屈曲粗形材Ｐ2
は、両鍔部Ｅ1 、Ｅ2 が間隙Ｃ内に維持され、他の部位
が第３下型７の凸部７ｂと第３上型８の凹部８ｂとによ
りｙ方向で小さな曲率に変形されるため、両鍔部Ｅ1 、
Ｅ2 が互いに近づく方向に屈曲され、第２屈曲粗形材Ｐ
3 に成形される。Then, the third lower mold 7 and the third lower mold 7
The first bent coarse profile P 2 is placed between the upper die 8, the first bending coarse profile P 2 lowers the third upper die 8 to the bottom dead center pressing the z-direction. Thereby, the first bent coarse material P 2
Is that the two flange portions E 1 and E 2 are maintained in the gap C, and the other portion is deformed to a small curvature in the y direction by the convex portion 7b of the third lower die 7 and the concave portion 8b of the third upper die 8. Therefore, both collars E 1 ,
E 2 are bent in a direction approaching each other, and the second bent coarse material P
Molded into 3 .
【００１９】「当接工程」次いで、図９〜１１に示すよ
うに、第４下型１０と第４上型１１とからなる第４成形
型１２を用意する。第４下型１０の上面１０ａはｙ方向
と平行に形成されており、上面１０ａには、ｘ方向とｚ
方向とがなす平面内で湾曲軸線Ｓに沿って湾曲し、かつ
ｙ方向とｚ方向とがなす平面内において、図中右側では
直径φＤの半円形をなし、中央部では徐々に変形され、
図中左側では半矩形をなした凹部１０ｂが凹設されてい
る。また、第４上型１１の下面１１ａもｙ方向と平行に
形成されており、下面１１ａには凹部１０ｂと整合する
凹部１１ｂが凹設されている。第４上型１１の下面１１
ａは、第４上型１１の下死点位置において、第４下型１
０の上面１０ａと密接されるようになっている。[Abutment Step] Next, as shown in FIGS. 9 to 11, a fourth molding die 12 including a fourth lower die 10 and a fourth upper die 11 is prepared. The upper surface 10a of the fourth lower mold 10 is formed parallel to the y direction, and the upper surface 10a is
Curved along the curved axis S in the plane defined by the directions, and in the plane defined by the y direction and the z direction, the right side in the drawing forms a semicircle having a diameter φD, and is gradually deformed in the center,
On the left side in the figure, a concave portion 10b having a semi-rectangular shape is provided. The lower surface 11a of the fourth upper die 11 is also formed in parallel with the y direction, and the lower surface 11a is provided with a concave portion 11b that matches the concave portion 10b. Lower surface 11 of fourth upper mold 11
a is the fourth lower mold 1 at the bottom dead center position of the fourth upper mold 11.
0 is in close contact with the upper surface 10a.
【００２０】そして、第４成形型１２の第４下型１０と
第４上型１１との間に第２屈曲粗形材Ｐ3 を載置し、第
４上型１１を下死点まで下降させて第２屈曲粗形材Ｐ3
をｚ方向からプレス加工する。これにより、第２屈曲粗
形材Ｐ3 は、両鍔部Ｅ1 、Ｅ 2 が第４下型１０の凹部１
０ｂに案内されて互いに当接され、他の部位が第４下型
１０の凹部１０ｂと第４上型１１の凹部１１ｂとに拘束
されるため、図１に示す湾曲中空パイプＰに成形され
る。The fourth lower mold 10 of the fourth molding die 12 and
The second bent coarse material P between the fourth upper die 11ThreePut on the
4 Lower the upper die 11 to the bottom dead center, andThree
Is pressed from the z direction. Thereby, the second bending coarse
Profile PThreeIs both tsuba E1, E Two Is the concave portion 1 of the fourth lower mold 10
0b is guided by each other, and the other part is the fourth lower mold.
10 and the concave portion 11b of the fourth upper die 11
Is formed into a curved hollow pipe P shown in FIG.
You.
【００２１】したがって、この製造方法では、中子を採
用することなく複雑に湾曲した湾曲中空パイプＰを製造
できる。これにより得られる湾曲中空パイプＰは、全て
プレス加工により成形されていることから、中子を採用
するような制限が断面形状にない。また、湾曲中空パイ
プＰの製造に際して、部品点数の削減と、出し入れ機構
の省略とが実現され、比較的簡易な第１〜４成形型３、
６、９、１２による同一方向からのプレス加工を行えば
足りるため、湾曲中空パイプＰの製造コストの低廉化が
実現される。Therefore, according to this manufacturing method, it is possible to manufacture a complicatedly curved curved hollow pipe P without employing a core. Since the curved hollow pipes P obtained by this are all formed by press working, there is no limitation on the cross-sectional shape such as employing a core. In manufacturing the curved hollow pipe P, reduction in the number of parts and omission of the insertion / removal mechanism are realized, and the first to fourth molding dies 3, which are relatively simple,
Since it is sufficient to perform press working from 6, 9, and 12 in the same direction, the manufacturing cost of the curved hollow pipe P can be reduced.
【００２２】この後、湾曲中空パイプＰの両鍔部Ｅ1 、
Ｅ2 の当接部を溶接し、やや偏平状にプレス加工した
後、穴明け、トリム及びバーリングを施すことにより、
中空のＬ型サスペンションアームを製造することができ
る。なお、実施形態の湾曲中空パイプＰは断面形状が真
円形及び矩形であったが、両鍔部Ｅ1 、Ｅ2 のｙ方向の
長さ及び断面山形状の曲率の調整並びに湾曲軸線Ｓの曲
率の調整により、断面形状が楕円、レーストラック形状
等の湾曲中空パイプを製造することも可能である。Thereafter, both flange portions E 1 of the curved hollow pipe P,
Welding the abutting portion of the E 2, after pressing slightly flat, drilling, by performing trim and burring,
A hollow L-shaped suspension arm can be manufactured. Although the cross-sectional shape of the curved hollow pipe P according to the embodiment is a true circle or a rectangle, the length of the both flange portions E 1 and E 2 in the y direction and the curvature of the cross-sectional mountain shape are adjusted, and the curvature of the bending axis S is adjusted. It is also possible to manufacture a curved hollow pipe having an elliptical cross section, a race track shape, or the like by adjusting.
【００２３】また、上記第１〜４成形型３、６、９、１
２は、同一厚さの平板Ｐ0 ばかりでなく、異なった厚さ
の平板Ｐ0 を採用しても外形上同一の湾曲中空パイプを
製造できる。The first to fourth molding dies 3, 6, 9, 1
2, the same thickness as well flat P 0 of can be produced by the same curved hollow pipe on the outer shape be employed a plate P 0 of different thicknesses.
【図１】実施形態に係り、所望の湾曲中空パイプの底面
図、両側面図及び平面図である。FIG. 1 is a bottom view, a side view, and a plan view of a desired curved hollow pipe according to an embodiment.
【図２】実施形態に係り、座標軸及び平板の斜視図であ
る。FIG. 2 is a perspective view of a coordinate axis and a flat plate according to the embodiment.
【図３】実施形態に係る第１成形型を示す図４のＩＩＩ
−ＩＩＩ矢視断面図である。FIG. 3 is a diagram illustrating a first mold according to the embodiment;
FIG. 3 is a cross-sectional view taken along the arrow III.
【図４】実施形態に係る第１成形型を示す図３のＩＶ−
ＩＶ矢視断面図である。FIG. 4 is a view illustrating a first mold according to the embodiment;
FIG. 4 is a sectional view taken along the arrow IV.
【図５】実施形態に係る第２成形型を示す図６のＶ−Ｖ
矢視断面図である。FIG. 5 is a cross-sectional view of the second mold according to the embodiment, taken along line VV of FIG. 6;
It is arrow sectional drawing.
【図６】実施形態に係る第２成形型を示す図５のＶＩ−
ＶＩ矢視断面図である。FIG. 6 illustrates a second mold according to the embodiment;
FIG. 6 is a sectional view taken along the arrow VI.
【図７】実施形態に係る第３成形型を示す図８のＶＩＩ
−ＶＩＩ矢視断面図である。FIG. 7 is a view illustrating a third mold according to the embodiment;
FIG. 7 is a cross-sectional view taken along arrow VII.
【図８】実施形態に係る第３成形型を示す図７のＶＩＩ
Ｉ−ＶＩＩＩ矢視断面図である。FIG. 8 is a view showing a third mold according to the embodiment, and is a sectional view taken along line VII of FIG. 7;
It is I-VIII arrow sectional drawing.
【図９】実施形態に係る第４成形型を示す図１０及び図
１１のＩＸ−ＩＸ矢視断面図である。FIG. 9 is a cross-sectional view taken along the line IX-IX of FIGS. 10 and 11 showing a fourth molding die according to the embodiment.
【図１０】実施形態に係る第４成形型を示す図９のＸ−
Ｘ矢視断面図である。FIG. 10 is a cross-sectional view of a fourth mold according to the embodiment, taken along line X- in FIG. 9;
It is X sectional view taken on the arrow.
【図１１】実施形態に係る第４成形型を示す図７のＸＩ
−ＸＩ矢視断面図である。FIG. 11 is a cross-sectional view illustrating a fourth mold according to the embodiment, taken along line XI in FIG. 7;
FIG. 11 is a sectional view taken along arrow XI.
ｘ…第１方向 ｙ…第２方向 ｚ…第３方向 Ｐ0 …平板 Ｐ1 …粗形材 Ｐ2 、Ｐ3 …屈曲粗形材（Ｐ2 …第１屈曲粗形材、Ｐ3
…第２屈曲粗形材） Ｐ…湾曲中空パイプ Ｅ1 、Ｅ2 …両鍔部 ３、６、９、１２…成形型（３…第１成形型、６…第２
成形型、９…第３成形型、１２…第４成形型） １０ｂ…凹部x: first direction y: second direction z: third direction P 0 : flat plate P 1 : coarse material P 2 , P 3 : bent coarse material (P 2 : first bent coarse material, P 3
... second bent coarse profile) P ... curved hollow pipe E 1, E 2 ... Ryotsuba section 3,6,9,12 ... mold (3 ... first mold, 6: second
Molding die, 9: third molding die, 12: fourth molding die) 10b: concave portion
Claims (1)
向に延在する平板を該第１方向及び該第２方向と直交す
る第３方向からプレス加工することにより、該第１方向
と該第３方向とがなす平面内で湾曲し、かつ該第２方向
と該第３方向とがなす平面内の両鍔部が互いに遠ざかる
方向に延在された断面山形状の粗形材を得る粗成形工程
と、 該粗形材を該第３方向からプレス加工することにより、
該両鍔部が該第３方向と略平行に屈曲された断面山形状
の屈曲粗形材を得る屈曲工程と、 該屈曲粗形材を該第３方向からプレス加工することによ
り、該両鍔部を成形型の凹部に案内させつつ他の部位を
該成形型で拘束し、該両鍔部を互いに当接させた湾曲中
空パイプを得る当接工程と、を有することを特徴とする
湾曲中空パイプの製造方法。1. A flat plate extending in a first direction and a second direction orthogonal to the first direction is pressed from a third direction orthogonal to the first direction and the second direction to form the first plate. A roughly shaped material having a mountain-shaped cross section that is curved in a plane defined by the first direction and the third direction, and extends in a direction in which both flanges in a plane defined by the second direction and the third direction move away from each other. A rough forming step of obtaining, by pressing the rough shaped material from the third direction,
A bending step of obtaining a bent coarse shaped material having a mountain-like cross section in which the both flange portions are bent substantially parallel to the third direction; and pressing the bent rough shaped material from the third direction, thereby forming the both flanges. The other part being constrained by the molding die while guiding the part to the concave part of the molding die, to obtain a curved hollow pipe in which the two flange parts are brought into contact with each other. Pipe manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07313871A JP3114918B2 (en) | 1995-12-01 | 1995-12-01 | Manufacturing method of curved hollow pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07313871A JP3114918B2 (en) | 1995-12-01 | 1995-12-01 | Manufacturing method of curved hollow pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09155446A JPH09155446A (en) | 1997-06-17 |
| JP3114918B2 true JP3114918B2 (en) | 2000-12-04 |
Family
ID=18046514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07313871A Expired - Fee Related JP3114918B2 (en) | 1995-12-01 | 1995-12-01 | Manufacturing method of curved hollow pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3114918B2 (en) |
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| JPH09155446A (en) | 1997-06-17 |
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