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JP5783598B2 - Pipe-shaped bending apparatus - Google Patents

Pipe-shaped bending apparatus Download PDF

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JP5783598B2
JP5783598B2 JP2011079624A JP2011079624A JP5783598B2 JP 5783598 B2 JP5783598 B2 JP 5783598B2 JP 2011079624 A JP2011079624 A JP 2011079624A JP 2011079624 A JP2011079624 A JP 2011079624A JP 5783598 B2 JP5783598 B2 JP 5783598B2
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mold
pipe
bending
shaped member
diameter side
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JP2012213783A (en
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由起緒 品川
由起緒 品川
誠 是繁
誠 是繁
長谷川 和也
和也 長谷川
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Daihatsu Motor Co Ltd
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Description

本発明は、パイプ状部材の曲げ成形装置に関する。   The present invention relates to a pipe-shaped member bending apparatus.

パイプ状の部材を曲げ成形により製作する場合、パイプベンダーと呼ばれる成形装置を用いるのが一般的である。この種の装置を用いた曲げ成形は、パイプ状部材の一端部と他端部をそれぞれ押し型と曲げ型とでクランプした状態で曲げ型を回転させて強制的にパイプ状部材を曲げることで行われる。ところが、パイプ状部材のうち上述した型でクランプされる部分は曲げ成形後に切断等により廃棄する必要が生じるため、特に丈の短いパイプ状部材に曲げ成形を施す場合、歩留まりの低下が問題となっていた。また、曲げ型でクランプした状態で強制的にパイプ状部材を曲げるために、例えば曲げ部の大径側領域など引き伸ばされながら曲げ変形を生じた領域では板厚が薄くなり、また、曲げ部の小径側領域など圧縮されながら曲げ変形を生じた領域では圧潰を生じる、といった品質の低下も問題となっていた。   When a pipe-shaped member is manufactured by bending, it is common to use a molding device called a pipe bender. Bending using this type of device is done by forcibly bending the pipe-shaped member by rotating the bending mold in a state where one end and the other end of the pipe-shaped member are clamped by the pressing mold and the bending mold, respectively. Done. However, since the portion clamped by the above-mentioned mold of the pipe-shaped member needs to be discarded by cutting or the like after bending, particularly when bending the pipe-shaped member having a short length, a decrease in yield becomes a problem. It was. In addition, in order to forcibly bend the pipe-shaped member in a state where it is clamped with a bending die, for example, in the region where the bending deformation occurs while being stretched, such as the large-diameter side region of the bending portion, the plate thickness becomes thin, and the bending portion There has also been a problem of quality degradation such as crushing in a region where bending deformation has occurred while being compressed, such as a region on the small diameter side.

上記以外の曲げ成形方法として、例えばプレス機を用いてパイプ状部材に曲げ成形を施す方法もあるが、この場合には、パイプ状部材がプレス圧で潰れないようにするため、パイプ状部材の中に砂や水などを入れた状態でプレス成形を行う必要が生じる。そのため、砂や水などが漏れないようにパイプ状部材の両端に栓をする必要が生じ、結局廃棄扱いとなる部位が生じる。また、通常のプレス設備と比べて設備費用が高額となるため、コストの面でも好ましいとは言えない。   As a bending method other than the above, there is also a method of bending the pipe-shaped member using, for example, a press machine. In this case, in order to prevent the pipe-shaped member from being crushed by the press pressure, It is necessary to perform press molding with sand or water inside. Therefore, it is necessary to plug the both ends of the pipe-like member so that sand, water, etc. do not leak, resulting in a portion that is eventually discarded. Further, since the equipment cost is higher than that of a normal press equipment, it cannot be said that it is preferable in terms of cost.

ここで、例えば下記特許文献1には、予め複数の部品を組付けることで、曲げ成形完了後の形状に準じたキャビティを内部に形成する固定金型を用意し、この固定金型のキャビティに向けてパイプ状部材を押込むことで、パイプ状部材に対して所定の曲げ成形を施す方法が開示されている。   Here, for example, in Patent Document 1 below, a fixed mold is prepared in which a plurality of parts are assembled in advance so as to form a cavity in accordance with the shape after the completion of the bending, and the cavity of the fixed mold is prepared. A method is disclosed in which a predetermined bending process is performed on a pipe-shaped member by pushing the pipe-shaped member toward the surface.

特開昭63−80924号公報JP-A-63-80924

上記特許文献1に記載の成形方法によれば、パイプ状部材の両端部が廃棄扱いにならずに済み、また、薄肉部も発生しないため材料コストや品質の面でも好ましいように思われる。しかしながら、この方法では、予め複数の部品を組付けることで曲げ成形のための空間(キャビティ)を形成しておき、この空間にパイプ状部材を押込む形態を採ることから、パイプ状部材の押込み先端側には内面側と外面側の双方から多大な負荷が掛かる傾向にある。そのため、押込み先端側を含む曲げ成形後のパイプ状部材の品質は必ずしも良好とはいえない。また、複数の部品で上記成形用空間を区画形成することから、曲げ成形後には、パイプ状部材を内側から成形する金型の分割をはじめとして上記成形用空間を形成する部品やその周辺部品の取外しを行い、然る後、別途設けたノックアウトパンチで曲げ成形後のパイプ状部材を成形金型から押し出す必要がある。このため、部品点数や加工工数が非常に多くなり、作業効率の低下、ひいては製造コストの増大が懸念される。   According to the molding method described in Patent Document 1, it seems that both ends of the pipe-shaped member do not have to be disposed of, and a thin portion is not generated, so that it is preferable in terms of material cost and quality. However, in this method, a space (cavity) for bending is formed by assembling a plurality of parts in advance, and the pipe-like member is pushed into this space. There is a tendency that a large load is applied to the tip side from both the inner surface side and the outer surface side. For this reason, the quality of the pipe-shaped member after bending including the indentation tip side is not necessarily good. In addition, since the molding space is defined by a plurality of parts, after bending, the parts forming the molding space and its peripheral parts, including the division of a mold for molding the pipe-shaped member from the inside, are provided. After removal, it is necessary to extrude the pipe-shaped member after bending from a molding die with a knockout punch provided separately. For this reason, the number of parts and the number of processing man-hours are extremely increased, and there is a concern that the work efficiency is lowered, and consequently the manufacturing cost is increased.

以上の事情に鑑み、高い寸法精度を確保でき、かつ加工工数の低減化と設備の簡素化を通じて製造コストの低減化を図ることが可能なパイプ状部材の曲げ成形技術を提供することを、本発明により解決すべき技術的課題とする。   In view of the above circumstances, it is an object of the present invention to provide a bending technique for a pipe-shaped member that can ensure high dimensional accuracy and can reduce the manufacturing cost by reducing the number of processing steps and simplifying the equipment. It is a technical problem to be solved by the invention.

前記課題の解決は、本発明に係るパイプ状部材の曲げ成形装置により達成される。すなわち、この曲げ成形装置は、型締めに伴い、パイプ状部材を曲げ成形するための湾曲筒状面が形成される一対の金型と、パイプ状部材を湾曲筒状面に向けて押込むための押込み型とを具備し、押込み型でパイプ状部材を押込むことで、一対の金型内に、パイプ状部材の曲げ成形完了後の形状に準じた湾曲筒状のキャビティが区画形成されるパイプ状部材の曲げ成形装置であって、一方の金型に、湾曲筒状面の小径側領域が形成され、他方の金型に、湾曲筒状面の大径側領域が形成され、押込み型は、曲げ成形の完了位置までパイプ状部材を押込んだ状態で、湾曲筒状面の大径側領域との間にキャビティの大径側空間を区画形成する点をもって特徴付けられる。   The solution to the above-described problem is achieved by the pipe-shaped member bending apparatus according to the present invention. That is, this bending apparatus includes a pair of molds in which a curved cylindrical surface for bending a pipe-shaped member is formed as the mold is clamped, and a push for pressing the pipe-shaped member toward the curved cylindrical surface. A pipe-shaped member in which a curved cylindrical cavity is formed in a pair of molds in accordance with the shape after the bending of the pipe-shaped member is completed by pressing the pipe-shaped member with a pressing mold. A bending apparatus for a member, wherein a small diameter side region of the curved cylindrical surface is formed in one mold, and a large diameter side region of the curved cylindrical surface is formed in the other mold, It is characterized in that the large-diameter side space of the cavity is defined between the large-diameter side region of the curved cylindrical surface in a state where the pipe-shaped member is pushed to the bending forming completion position.

以下、本発明に係る曲げ成形装置の成形動作(作用)を説明する。上記構成の曲げ成形装置において、まず一対の金型を型締めした状態で、押込み型によりパイプ状部材を湾曲筒状面に向けて押込むことで、パイプ状部材の押込み先端側が湾曲筒状面に押付けられ、これによりパイプ状部材の曲げ成形が開始する。そして、押込み型により曲げ成形の完了位置までパイプ状部材を押込んだ状態では、押込み型と湾曲筒状面の大径側領域との間に、パイプ状部材の曲げ成形完了後の形状に準じた湾曲筒状のキャビティの大径側空間が区画形成される。これにより、湾曲筒状面により曲げ成形を受けた部分が、押込み型によりその内面側からも押圧され、最終的にキャビティに準じた形状に曲げ成形される。このように、パイプ状部材の内面側と外面側とで曲げ成形の開始時期に時間差を設けることで、パイプ状部材の押込み先端側に多大な負荷が掛かる事態を可及的に避けて、先端側を傷付けることなくパイプ状部材全体を高精度に成形することが可能となる。この結果、形状精度の向上と共に歩留まりの向上を図ることが可能となる。   The molding operation (action) of the bending apparatus according to the present invention will be described below. In the bending apparatus having the above-described configuration, the pipe-shaped member is pushed toward the curved cylindrical surface by the pushing mold in a state where the pair of dies are clamped, so that the pushing tip side of the pipe-shaped member is the curved cylindrical surface. As a result, bending of the pipe-shaped member is started. Then, in a state where the pipe-shaped member is pushed to the bending completion position by the push die, the shape after the bending of the pipe-like member is completed between the push die and the large-diameter side region of the curved cylindrical surface. A large-diameter space of the curved cylindrical cavity is defined. As a result, the portion that has undergone bending molding by the curved cylindrical surface is also pressed from the inner surface side by the pressing die, and is finally bent into a shape that conforms to the cavity. In this way, by providing a time difference in the start time of bending molding between the inner surface side and the outer surface side of the pipe-shaped member, it is possible to avoid as much as possible a situation in which a large load is applied to the pushing tip side of the pipe-shaped member. The entire pipe-shaped member can be formed with high accuracy without damaging the side. As a result, it is possible to improve the shape accuracy and the yield.

また、本発明に係る曲げ成形装置によれば、曲げ成形後、押込み型を引抜き、一対の金型を型開きすることにより、湾曲筒状面の大径側領域を構成する他方の金型が、同筒状面の小径側領域を構成する一方の金型から離間し、キャビティの大径側が開放される。このように、型開き等の必要最小限の動作だけで曲げ成形後のパイプ状部材を曲げ成形装置から取出すことができるので、作業効率にも優れている。また、非常に少ない部品点数でもって曲げ成形後のパイプ状部材を容易に取出し可能なキャビティを構成することができるので、設備コストの高騰を抑えることもできる。   Further, according to the bending apparatus according to the present invention, after bending, the pressing mold is pulled out and the pair of molds are opened, so that the other mold constituting the large-diameter side region of the curved cylindrical surface is The large-diameter side of the cavity is opened away from one mold forming the small-diameter side region of the cylindrical surface. Thus, since the pipe-shaped member after bending can be taken out from the bending apparatus only with the minimum necessary operation such as mold opening, the working efficiency is excellent. Moreover, since the cavity which can take out the pipe-shaped member after bending shaping | molding with a very small number of parts can be comprised, it can also suppress the increase in installation cost.

また、本発明に係る曲げ成形装置は、一方の金型が、湾曲筒状面の小径側領域を有する金型本体と、金型本体に対して弾性支持された弾性支持型とを有し、弾性支持型は、型締め時、弾性力に抗して金型本体に近接することで、金型本体との間にキャビティの小径側空間を区画形成するものであってもよい。   Further, the bending apparatus according to the present invention has a mold body in which one mold has a small-diameter side region of a curved cylindrical surface, and an elastic support mold that is elastically supported with respect to the mold body. The elastic support mold may be configured to define a space on the small-diameter side of the cavity between the mold body and the mold body by approaching the mold body against the elastic force when the mold is clamped.

このように、湾曲筒状面の小径側領域が形成される一方の金型を、金型本体と弾性支持型とで構成することで、型締めだけの単純かつ必要最小限の動作でキャビティの小径側空間を形成することができる。また、曲げ成形後には、同じく型開きのみの単純な動作で、弾性支持型が型締めにより附勢される前の位置に戻る。これにより、曲げ成形を施したパイプ状部材の小径側領域の拘束が解除されるので、当該パイプ状部材を非常に容易かつ傷付けることなく取出すことができ、作業効率の更なる改善を図ることが可能となる。   In this way, by configuring the mold on which the small-diameter side region of the curved cylindrical surface is formed with the mold body and the elastic support mold, the cavity can be operated with a simple and minimal operation only by clamping. A small-diameter side space can be formed. In addition, after the bending, the elastic support die is returned to the position before being urged by the clamping by a simple operation with only the mold opening. As a result, the restriction on the small-diameter side region of the pipe-shaped member subjected to bending molding is released, so that the pipe-shaped member can be taken out very easily and without being damaged, and the work efficiency can be further improved. It becomes possible.

また、本発明に係る曲げ成形装置は、押込み型と弾性支持型に、押込み型によるパイプ状部材の押込み動作に伴い、押込み方向に直交する向きで互いに係合可能な一対の係合部が設けられているものであってもよく、また、この場合、パイプ状部材の曲げ成形開始時に、一対の係合部の少なくとも一部同士が係合しているものであってもよい。   In the bending apparatus according to the present invention, a pair of engaging portions that can be engaged with each other in a direction orthogonal to the pressing direction are provided in the pressing mold and the elastic support mold in accordance with the pressing operation of the pipe-shaped member by the pressing mold. In this case, at least a part of the pair of engaging portions may be engaged with each other at the start of bending of the pipe-shaped member.

このように、押込み型と弾性支持型とに互いに係合可能な一対の係合部を設けることで、相対的に位置精度が確保しやすい側の成形型(押込み型)に合わせて、金型本体に弾性支持されている成形型(弾性支持型)を位置決めすることができる。これにより、金型本体と弾性支持型との間にキャビティの小径側空間を形成する場合においても高い形状精度を得ることができる。また、この場合、パイプ状部材の曲げ成形開始時に一対の係合部同士が係合するように構成することで、弾性支持型が確実に位置決めされた状態で曲げ成形を開始することができる。よって、キャビティの形状精度をさらに高めて、曲げ成形の一層の精度向上を図ることが可能となる。   In this way, by providing a pair of engaging portions that can be engaged with each other between the push mold and the elastic support mold, the mold is matched to the mold (push mold) on the side where the positional accuracy is relatively easily secured. A mold (elastic support mold) that is elastically supported by the main body can be positioned. Thereby, even when the small-diameter side space of the cavity is formed between the mold body and the elastic support mold, high shape accuracy can be obtained. Further, in this case, by forming the pipe-shaped member so that the pair of engaging portions are engaged with each other at the start of bending, bending can be started in a state where the elastic support mold is reliably positioned. Therefore, it is possible to further improve the shape accuracy of the cavity and further improve the accuracy of the bending.

以上のように、本発明に係る曲げ成形装置によれば、高い寸法精度を確保しつつも、加工工数の低減化と設備の簡素化を通じて製造コストの低減化を図ることが可能となる。   As described above, according to the bending apparatus according to the present invention, it is possible to reduce the manufacturing cost by reducing the number of processing steps and simplifying the equipment while ensuring high dimensional accuracy.

本発明の一実施形態に係るパイプ状部材の曲げ成形装置の断面図である。It is sectional drawing of the bending apparatus of the pipe-shaped member which concerns on one Embodiment of this invention. 図1に示す曲げ成形装置の要部拡大断面図である。It is a principal part expanded sectional view of the bending apparatus shown in FIG. 図1に示す曲げ成形装置の(a)a−a断面図、(b)b−b断面図である。It is (a) aa sectional drawing and (b) bb sectional drawing of the bending apparatus shown in FIG. 図1に示す装置を用いた曲げ成形動作を説明するための要部拡大断面図であって、それぞれ(a)曲げ成形開始直後、(b)曲げ成形途中、(c)曲げ成形完了時における湾曲筒状面の大径側領域を拡大して示す断面図である。It is a principal part expanded sectional view for demonstrating the bending operation | movement using the apparatus shown in FIG. 1, Comprising: (a) Immediately after the start of bending forming, (b) During bending forming, (c) The curve at the time of completion of bending forming It is sectional drawing which expands and shows the large diameter side area | region of a cylindrical surface. 図1に示す装置を用いた曲げ成形動作を説明するための断面図である。It is sectional drawing for demonstrating the bending shaping | molding operation | movement using the apparatus shown in FIG. 図1に示す装置を用いた曲げ成形動作を説明するための断面図である。It is sectional drawing for demonstrating the bending shaping | molding operation | movement using the apparatus shown in FIG. 図1に示す装置を用いた曲げ成形の後、当該曲げ成形を施したパイプ状部材を取出す際の動作を説明するための断面図である。It is sectional drawing for demonstrating the operation | movement at the time of taking out the pipe-shaped member which performed the said bending molding after the bending using the apparatus shown in FIG.

以下、本発明に係るパイプ状部材の曲げ成形装置の一実施形態を図面に基づき説明する。なお、以下の説明では、説明の便宜上、一対の金型の型締め方向を上下方向として説明するが、本曲げ成形装置の使用の形態はこれに限定されるものではない。   Hereinafter, an embodiment of a pipe-shaped member bending apparatus according to the present invention will be described with reference to the drawings. In the following description, for convenience of explanation, the mold clamping direction of the pair of molds will be described as the vertical direction, but the form of use of the present bending apparatus is not limited to this.

図1は、本発明の一実施形態に係るパイプ状部材の曲げ成形装置1の断面図を示している。この曲げ成形装置1は、直線状に伸びるパイプ状部材2の全体又は一部を湾曲筒状に曲げ成形するためのものであって、型締めに伴い、パイプ状部材2を曲げ成形するための湾曲筒状面3が形成される一対の金型4,5と、パイプ状部材2を湾曲筒状面3に向けて押込むための押込み型6とを具備する。そして、押込み型6でパイプ状部材2を押込むことで、一対の金型4,5内に、パイプ状部材2の曲げ成形完了後の形状に準じた湾曲筒状のキャビティ7が区画形成されるようになっている。   FIG. 1 shows a cross-sectional view of a pipe-shaped member bending apparatus 1 according to an embodiment of the present invention. This bending apparatus 1 is for bending a whole or a part of a pipe-like member 2 extending in a straight shape into a curved cylinder, and for bending the pipe-like member 2 in accordance with clamping. A pair of molds 4 and 5 in which the curved cylindrical surface 3 is formed, and a pressing die 6 for pressing the pipe-shaped member 2 toward the curved cylindrical surface 3 are provided. Then, by pushing the pipe-like member 2 with the pushing die 6, a curved cylindrical cavity 7 conforming to the shape after the bending of the pipe-like member 2 is completed is defined in the pair of molds 4, 5. It has become so.

一対の金型4,5は、この実施形態では、型締めした状態で一端開口側(図1でいうと左側)からパイプ状部材2を挿入可能な挿入孔8を形成しており、この挿入孔8の他端側(図1でいうと右側)には、湾曲筒状面3が連続している。この実施形態では、図3(a)(b)に示すように、挿入孔8と湾曲筒状面3は何れも断面真円状をなし、各々の中心軸線を通る断面で上型4と下型5に分割形成されている。従い、下型5には、挿入孔8の下側半筒領域と湾曲筒状面3の小径側領域9が形成される。また、上型4には、挿入孔8の上側半筒領域と湾曲筒状面3の大径側領域10が形成される。   In this embodiment, the pair of dies 4 and 5 is formed with an insertion hole 8 into which the pipe-like member 2 can be inserted from one end opening side (left side in FIG. 1) in a clamped state. The curved cylindrical surface 3 is continuous with the other end side of the hole 8 (the right side in FIG. 1). In this embodiment, as shown in FIGS. 3 (a) and 3 (b), the insertion hole 8 and the curved cylindrical surface 3 both have a perfect circular cross section, and the upper die 4 and the lower die 4 are cross sections passing through the respective central axes. The mold 5 is divided and formed. Accordingly, the lower mold 5 is formed with the lower half cylinder region of the insertion hole 8 and the small diameter region 9 of the curved cylindrical surface 3. Further, the upper mold 4 is formed with an upper half cylinder region of the insertion hole 8 and a large diameter side region 10 of the curved cylindrical surface 3.

下型5は、この実施形態では、図1に示すように、湾曲筒状面3の小径側領域9を有する金型本体11と、この金型本体11に対して弾性体12を介して上方に附勢支持された弾性支持型13とで構成されている。また、一対の金型4,5の型締め時、上型4の下端面14は弾性支持型13の上端面15と当接して下方に押圧されるようになっており、弾性体12の附勢力に抗して弾性支持型13が金型本体11に近接することで、弾性支持型13と金型本体11との間にキャビティ7の小径側空間16が区画形成されるようになっている。なお、この実施形態では、図2に示すように、弾性支持型13の一部が挿入孔8の内部に位置しており、弾性支持型13と挿入孔8との間に、キャビティ7の小径側空間16と連続する直線状の案内空間17が形成されている。この案内空間17は、押込み型6によるパイプ状部材2の押込み動作の開始に伴い、パイプ状部材2の下側部分をキャビティ7の小径側空間16にスムーズに案内する役割を果たす。   In this embodiment, as shown in FIG. 1, the lower die 5 is a mold main body 11 having a small-diameter side region 9 of the curved cylindrical surface 3, and an upper side of the mold main body 11 via an elastic body 12. It is comprised with the elastic support type | mold 13 energized and supported by. Further, when the pair of molds 4 and 5 are clamped, the lower end surface 14 of the upper die 4 is in contact with the upper end surface 15 of the elastic support die 13 and is pressed downward. The elastic support mold 13 comes close to the mold body 11 against the force, so that the small-diameter side space 16 of the cavity 7 is defined between the elastic support mold 13 and the mold body 11. . In this embodiment, as shown in FIG. 2, a part of the elastic support mold 13 is located inside the insertion hole 8, and the small diameter of the cavity 7 is interposed between the elastic support mold 13 and the insertion hole 8. A linear guide space 17 that is continuous with the side space 16 is formed. The guide space 17 plays a role of smoothly guiding the lower portion of the pipe-like member 2 to the small-diameter side space 16 of the cavity 7 with the start of the pushing operation of the pipe-like member 2 by the pushing die 6.

押込み型6は、一対の金型4,5の型締め方向に対して直交する向きに沿って往復動可能に構成されるもので、基端側に設けられ、挿入孔8内に配置したパイプ状部材2をキャビティ7側に向けて押込むための押圧面18と、押圧面18からキャビティ7側に伸び、挿入孔8との間でパイプ状部材2を拘束する拘束部19と、拘束部19からさらにキャビティ7側に伸び、曲げ成形完了位置において、パイプ状部材2を内面側から押圧成形する成形部20とを有する。このうち成形部20は、曲げ成形完了位置(図1中、鎖線で示す位置)まで押込み型6を湾曲筒状面3の内部に導入した状態で、湾曲筒状面3の大径側領域10との間にキャビティ7の大径側空間21を区画形成するようになっている。   The pushing mold 6 is configured to be reciprocable along a direction orthogonal to the clamping direction of the pair of molds 4 and 5, and is provided on the proximal end side and is a pipe disposed in the insertion hole 8. A pressing surface 18 for pushing the cylindrical member 2 toward the cavity 7, a restraining portion 19 extending from the pressing surface 18 toward the cavity 7, and restraining the pipe-shaped member 2 between the insertion hole 8, Furthermore, it has the shaping | molding part 20 which extends to the cavity 7 side and press-molds the pipe-shaped member 2 from an inner surface side in the bending shaping completion position. Among these, the molding part 20 is the large-diameter side area | region 10 of the curved cylindrical surface 3 in the state which introduce | transduced the pressing type | mold 6 into the inside of the curved cylindrical surface 3 to the bending completion completion position (position shown with a dashed line in FIG. 1). A large-diameter space 21 of the cavity 7 is defined between the two.

押込み型6と弾性支持型13には、押込み型6によるパイプ状部材2の押込み動作に伴い、押込み方向に直交する向き(図1中、紙面を貫通する向き)で互いに係合可能な一対の係合部が設けられており、パイプ状部材2の曲げ成形開始時、一対の係合部の少なくとも一部同士が係合するようになっている(後述する図5を参照)。この実施形態では、図1に示すように、押込み型6の一部下方が切欠かれた形状をなし、この切欠き部24に弾性支持型13の一端が嵌り合うようになっている。また、弾性支持型13の上端には、押込み方向に伸びる一方の係合部としての突条部22が設けられると共に、押込み型6の切欠き部24の下端には、押込み方向に伸びる他方の係合部としての溝部23が設けられている。これら一対の係合部としての突条部22と溝部23は、押込み型6による押込み動作によりパイプ状部材2が湾曲筒状面3に到達する前に、互いに嵌合を開始するようになっている(図5を参照)。   The pushing die 6 and the elastic support die 13 are engaged with each other in a direction perpendicular to the pushing direction (direction penetrating the paper surface in FIG. 1) in accordance with the pushing operation of the pipe-shaped member 2 by the pushing die 6. An engaging portion is provided, and at the time of starting the bending of the pipe-shaped member 2, at least a part of the pair of engaging portions is engaged with each other (see FIG. 5 described later). In this embodiment, as shown in FIG. 1, the push die 6 has a shape in which a part below is cut out, and one end of the elastic support die 13 is fitted into the cut portion 24. The upper end of the elastic support die 13 is provided with a protrusion 22 as one engaging portion extending in the pushing direction, and the other end of the notch 24 of the pushing die 6 is extended in the pushing direction. A groove portion 23 is provided as an engaging portion. The protrusions 22 and the grooves 23 as the pair of engaging portions start to be fitted to each other before the pipe-like member 2 reaches the curved cylindrical surface 3 by the pushing operation by the pushing die 6. (See FIG. 5).

以下、上記構成の曲げ成形装置1の動作の一例を説明する。   Hereinafter, an example of the operation of the bending apparatus 1 having the above configuration will be described.

まず、図1に示すように、一対の金型4,5の型締め動作により当該一対の金型4,5内に挿入孔8を形成すると共に、挿入孔8の他端側に連続して湾曲筒状面3を形成する。また、この型締めに伴い、上型4の下端面14を、下型5を構成する弾性支持型13の上端面15に当接させ、弾性体12の付勢力に抗して上端面15を下方に押圧することで、弾性支持型13と金型本体11との間にキャビティ7の小径側空間16を区画形成する。   First, as shown in FIG. 1, the insertion hole 8 is formed in the pair of molds 4, 5 by the clamping operation of the pair of molds 4, 5, and continuously to the other end side of the insertion hole 8. A curved cylindrical surface 3 is formed. As the mold is clamped, the lower end surface 14 of the upper die 4 is brought into contact with the upper end surface 15 of the elastic support die 13 constituting the lower die 5, and the upper end surface 15 is made to resist the urging force of the elastic body 12. By pressing downward, the small-diameter side space 16 of the cavity 7 is partitioned between the elastic support mold 13 and the mold body 11.

然る後、挿入孔8の一端開口側からパイプ状部材2を挿入し、押込み型6を湾曲筒状面3に向けて移動させることで、押込み型6の押圧面18でパイプ状部材2を湾曲筒状面3に向けて押込む(図5を参照)。これにより、パイプ状部材2が湾曲筒状面3の大径側領域10に押し付けられ、図4(a)に示すように、大径側領域10に倣って内径側に向けて曲げ変形を開始する。また、案内空間17を介してキャビティ7の小径側空間16に導入されたパイプ状部材2の押込み先端部が外径側(上型4から離間する向き)に向けて曲げ変形を開始する。なお、横置きの場合であれば、型締め前に、下型5の金型本体11に設けた挿入孔8の下側半筒領域上にパイプ状部材2を載置し、然る後、型締めを行うようにしてもよい。このようにパイプ状部材2をセットすることで、押込み型6に必要なストローク量を小さくできる。   Thereafter, the pipe-shaped member 2 is inserted from one end opening side of the insertion hole 8 and the pushing die 6 is moved toward the curved cylindrical surface 3, so that the pipe-like member 2 is moved by the pressing surface 18 of the pushing die 6. It pushes toward the curved cylindrical surface 3 (refer FIG. 5). As a result, the pipe-like member 2 is pressed against the large-diameter side region 10 of the curved cylindrical surface 3, and as shown in FIG. 4A, bending deformation is started toward the inner-diameter side following the large-diameter side region 10. To do. In addition, the pushing tip of the pipe-shaped member 2 introduced into the small-diameter side space 16 of the cavity 7 via the guide space 17 starts bending deformation toward the outer-diameter side (direction away from the upper mold 4). In the case of horizontal placement, the pipe-like member 2 is placed on the lower half cylinder region of the insertion hole 8 provided in the mold body 11 of the lower die 5 before clamping, and then, Mold clamping may be performed. By setting the pipe-like member 2 in this way, the stroke amount required for the pushing die 6 can be reduced.

ここで、パイプ状部材2の大径側となる領域は、図4(a)(b)に示すように、押込み型6と同期して湾曲筒状面3の他端側に移動し、当該移動に伴って上記大径側となる領域がその押込み先端側から基端側にかけて順次、内径側への曲げ変形を生じる。この際、パイプ状部材2の押込み先端部は、押込み動作(曲げ成形動作)が進行するにつれて湾曲筒状面3の大径側領域10から離れる向きに変形していく一方、押込み型6の成形部20とパイプ状部材2の押込み先端部とのすき間は、押込み動作(曲げ成形動作)が進行するにつれて小さくなっていく。そして、押込み型6が曲げ成形完了位置(図1中、鎖線で示す位置)に到達すると、押込み型6の成形部20と湾曲筒状面3の大径側領域10との間にキャビティ7の大径側空間21が形成される。これにより、パイプ状部材2が成形部20によって外径側に曲げ戻され(図4(c)を参照)、最終的に、キャビティ7の大径側空間21に準じた形状にパイプ状部材2が曲げ成形される。もちろん、パイプ状部材2の小径側となる部分についても、キャビティ7の小径側空間16に導入されることで、小径側空間16に準じた形状に曲げ成形される(図6を参照)。この実施形態では、両端面が平行なままの状態で曲げ成形が完了する。   Here, the region on the large diameter side of the pipe-like member 2 moves to the other end side of the curved cylindrical surface 3 in synchronization with the push-in die 6 as shown in FIGS. Along with the movement, the region on the large diameter side sequentially undergoes bending deformation toward the inner diameter side from the pushing distal end side to the proximal end side. At this time, the pushing tip portion of the pipe-like member 2 is deformed in a direction away from the large-diameter region 10 of the curved cylindrical surface 3 as the pushing operation (bending molding operation) proceeds, while the pushing die 6 is molded. The clearance between the portion 20 and the indentation tip of the pipe-shaped member 2 becomes smaller as the indentation operation (bending molding operation) proceeds. When the pressing die 6 reaches a bending forming completion position (a position indicated by a chain line in FIG. 1), the cavity 7 is formed between the forming portion 20 of the pressing die 6 and the large-diameter side region 10 of the curved cylindrical surface 3. A large-diameter side space 21 is formed. As a result, the pipe-shaped member 2 is bent back to the outer diameter side by the molding portion 20 (see FIG. 4C), and finally the pipe-shaped member 2 has a shape corresponding to the large-diameter side space 21 of the cavity 7. Is bent. Of course, the portion on the small diameter side of the pipe-shaped member 2 is also bent into a shape corresponding to the small diameter side space 16 by being introduced into the small diameter side space 16 of the cavity 7 (see FIG. 6). In this embodiment, bending is completed with both end faces being parallel.

このようにしてパイプ状部材2に曲げ成形を施した後、当該パイプ状部材2を一対の金型4,5から取出す。具体的には、図7に示すように、まず押込み型6をパイプ状部材2から引抜き、一対の金型4,5外へ退避させる。そして、一対の金型4,5の型開きにより、上型4の下端面14と弾性支持型13の上端面15との当接状態を解消することで、弾性支持型13を金型本体11に対して上方に浮上させ、弾性支持型13をパイプ状部材2の内周面から離間させる。これにより、パイプ状部材2は何らの拘束を受けることなく金型本体11上に載置された状態となるので、これを少し上方に移動した後、一端側にスライドさせることで、当該パイプ状部材2を金型本体11と弾性支持型13との間から極めて容易に取出すことができる。併せて、この実施形態では、湾曲筒状面3と挿入孔8が共に、中心軸線を常に含む位置で上型4と下型5とに分割形成されているので(図3を参照)、金型本体11に設けた挿入孔8の分割面や湾曲筒状面3の小径側領域9に引っ掛かることなく取出すことができる。   After bending the pipe-like member 2 in this way, the pipe-like member 2 is taken out from the pair of molds 4 and 5. Specifically, as shown in FIG. 7, first, the pushing die 6 is pulled out from the pipe-like member 2 and retracted out of the pair of dies 4 and 5. Then, by opening the pair of molds 4 and 5, the contact state between the lower end surface 14 of the upper mold 4 and the upper end surface 15 of the elastic support mold 13 is eliminated, so that the elastic support mold 13 is moved to the mold body 11. The elastic support die 13 is separated from the inner peripheral surface of the pipe-like member 2. Thereby, since the pipe-shaped member 2 will be in the state mounted on the metal mold | die main body 11, without receiving any restrictions, after moving this a little upwards, the said pipe-shaped member 2 is made to slide to one end side. The member 2 can be taken out very easily between the mold body 11 and the elastic support mold 13. In addition, in this embodiment, since both the curved cylindrical surface 3 and the insertion hole 8 are divided into the upper mold 4 and the lower mold 5 at a position always including the central axis (see FIG. 3), the gold It can be taken out without being caught by the divided surface of the insertion hole 8 provided in the mold main body 11 or the small-diameter side region 9 of the curved cylindrical surface 3.

このように、本発明に係る曲げ成形装置1によれば、先に湾曲筒状面3の大径側領域10によりパイプ状部材2の押込み先端部が曲げ成形を受け、然る後、押込み型6によりその内面側から曲げ戻されることで、最終的にキャビティ7に準じた形状に曲げ成形される。従って、パイプ状部材2の押込み先端側に多大な負荷が掛かる事態を可及的に避けて、押込み先端部を傷付けることなくパイプ状部材2全体を高精度に成形することができ、これにより、高い歩留まりを達成することができる。また、型締めによりキャビティ7の小径側空間16を形成し、型開きにより曲げ成形を完了したパイプ状部材2の内周面から離間可能なように、下型5を、金型本体11と、金型本体11に弾性支持された弾性支持型13とで構成したので、曲げ成形後、押込み型6を引抜き、一対の金型4,5を型開きするだけの動作でもって、曲げ成形後のパイプ状部材2を曲げ成形装置1から取出すことができる。また、非常に少ない部品点数で曲げ成形後のワークを取出し可能なキャビティを構成することができるので、設備コストの高騰を抑えることができ、またメンテナンスも容易である。   As described above, according to the bending apparatus 1 according to the present invention, the pushing tip portion of the pipe-like member 2 is first subjected to bending molding by the large-diameter side region 10 of the curved cylindrical surface 3, and thereafter, the pushing mold is used. By being bent back from the inner surface side by 6, it is finally bent into a shape according to the cavity 7. Therefore, avoiding as much as possible the situation where a large load is applied to the pushing tip side of the pipe-like member 2, the entire pipe-like member 2 can be formed with high accuracy without damaging the pushing tip portion, High yield can be achieved. Further, the lower mold 5 is formed with the mold body 11 so as to be separable from the inner peripheral surface of the pipe-shaped member 2 which has formed the small-diameter side space 16 of the cavity 7 by mold clamping and has been bent by mold opening. Since it is composed of the elastic support mold 13 elastically supported by the mold main body 11, after the bending molding, the pushing mold 6 is pulled out and the pair of molds 4 and 5 are simply opened. The pipe-shaped member 2 can be taken out from the bending apparatus 1. In addition, since a cavity capable of taking out a workpiece after bending forming can be configured with a very small number of parts, an increase in equipment cost can be suppressed, and maintenance is easy.

また、この実施形態では、押込み型6と弾性支持型13とに、押込み方向に直交する向きで互いに係合可能な一対の係合部となる突条部22と溝部23とをそれぞれ設けるようにした。これにより、パイプ状部材2の押込み動作に伴い、押込み型6の拘束部19が挿入孔8の位置精度に倣って位置決めされる。また、この拘束部19と共に押込み型6に一体に形成される溝部23が突条部22と嵌り合うことで、突条部22を一体に有する弾性支持型13が押込み型6の位置精度に倣って位置決め(特に押込み方向と直交する水平方向の位置決め)がなされる。従って、キャビティ7の小径側空間16を金型本体11と弾性支持型13との間に形成されるキャビティ7の小径側空間16の形状精度を高めることができる。特に、パイプ状部材2の曲げ成形開始時までに一対の係合部(突条部22、溝部23)同士を係合させることで、弾性支持型13が確実に位置決めされた状態で曲げ成形を開始することができる。これにより、キャビティ7の形状精度をさらに高めて、曲げ成形の精度を一層向上させることが可能となる。   Further, in this embodiment, the pushing die 6 and the elastic support die 13 are provided with a pair of protrusions 22 and a groove 23 which are a pair of engaging portions that can be engaged with each other in a direction orthogonal to the pushing direction. did. Thereby, the restraining part 19 of the pushing die 6 is positioned following the positional accuracy of the insertion hole 8 with the pushing operation of the pipe-shaped member 2. Further, the groove portion 23 formed integrally with the pushing die 6 together with the restraining portion 19 is fitted to the protruding portion 22, so that the elastic support die 13 having the protruding portion 22 integrally follows the positional accuracy of the pushing die 6. Positioning (especially positioning in the horizontal direction perpendicular to the pushing direction). Therefore, the shape accuracy of the small-diameter side space 16 of the cavity 7 formed between the mold body 11 and the elastic support die 13 in the small-diameter side space 16 of the cavity 7 can be increased. In particular, by bending the pipe-like member 2 by the time when the bending of the pipe-shaped member 2 is started, the bending of the elastic support die 13 is reliably performed by engaging the pair of engaging portions (the protruding portion 22 and the groove portion 23) with each other. Can start. Thereby, the shape accuracy of the cavity 7 can be further increased, and the accuracy of bending can be further improved.

なお、上記実施形態では、パイプ状部材2の曲げ成形開始時までに一対の係合部(突条部22、溝部23)同士を係合させるようにした場合を説明したが、パイプ状部材2が湾曲筒状面3に向けてスムーズに導入されるのであれば、必ずしもパイプ状部材2の曲げ成形開始時までに係合させる必要はない。例えば、曲げ成形途中で突条部22と溝部23とが嵌合を開始するように構成してもよい。むしろ、曲げ成形開始時、弾性支持型13に若干の遊びがあることで、パイプ状部材2をキャビティ7の小径側空間16に向けてスムーズに導入できる場合もあり得る。もちろん、型締めにより弾性支持型13が完全に位置決め固定されているのであれば、押込み型6との間で互いに係合可能な一対の係合部を設けずともよい。   In the above-described embodiment, the case where the pair of engaging portions (the protruding portion 22 and the groove portion 23) are engaged with each other by the time when the bending of the pipe-shaped member 2 is started has been described. Is smoothly introduced toward the curved cylindrical surface 3, it is not always necessary to engage the pipe-shaped member 2 before the start of bending. For example, you may comprise so that the protrusion part 22 and the groove part 23 may start fitting in the middle of bending molding. Rather, there may be a case where the pipe-like member 2 can be smoothly introduced toward the small-diameter side space 16 of the cavity 7 due to some play in the elastic support mold 13 at the start of bending. Of course, if the elastic support die 13 is completely positioned and fixed by clamping, it is not necessary to provide a pair of engaging portions that can engage with the pusher die 6.

また、上記実施形態では、下型5を、金型本体11と、金型本体11に対して弾性支持される弾性支持型13とで構成した場合を例示したが、もちろんこれ以外の構成を取ることも可能であり、例えば金型本体11との間に常時キャビティ7の小径側空間16が形成されるように、弾性支持型13を金型本体11に固定する(あるいは一体に形成する)ようにしてもよい。このように構成することで、キャビティ7の小径側空間16を非常に高精度に形成することができるので、要求される曲げ成形精度が非常に高い場合に有効である。   Moreover, in the said embodiment, although the case where the lower mold | type 5 was comprised with the metal mold | die main body 11 and the elastic support type | mold 13 elastically supported with respect to the metal mold | die main body 11 was illustrated, of course, other structures are taken. For example, the elastic support mold 13 is fixed to the mold body 11 (or formed integrally) so that the small-diameter side space 16 of the cavity 7 is always formed between the mold body 11 and the mold body 11. It may be. With such a configuration, the small-diameter side space 16 of the cavity 7 can be formed with very high accuracy, which is effective when the required bending accuracy is very high.

1 パイプ状部材の曲げ成形装置
2 パイプ状部材
3 湾曲筒状面
4 上型
5 下型
6 押込み 型
7 キャビティ
8 挿入孔
9 小径側領域
10 大径側領域
11 金型本体
12 弾性体
13 弾性支持型
16 小径側空間
17 案内空間
18 押圧面
19 拘束部
20 成形部
21 大径側空間
22 突条部
23 溝部
DESCRIPTION OF SYMBOLS 1 Pipe-shaped member bending apparatus 2 Pipe-shaped member 3 Curved cylindrical surface 4 Upper mold | type 5 Lower mold | type 6 Push type | mold 7 Cavity 8 Insertion hole 9 Small diameter side area | region 10 Large diameter side area | region 11 Mold body 12 Elastic body 13 Elastic support Mold 16 Small-diameter side space 17 Guide space 18 Pressing surface 19 Restraining portion 20 Molding portion 21 Large-diameter side space 22 Projection portion 23 Groove portion

Claims (2)

型締めに伴い、パイプ状部材を曲げ成形するための湾曲筒状面が形成される一対の金型と、前記パイプ状部材を前記湾曲筒状面に向けて押込むための押込み型とを具備し、前記押込み型で前記パイプ状部材を押込むことで、前記一対の金型内に、パイプ状部材の曲げ成形完了後の形状に準じた湾曲筒状のキャビティが区画形成されるパイプ状部材の曲げ成形装置であって、
前記一方の金型に、前記湾曲筒状面の小径側領域が形成され、前記他方の金型に、前記湾曲筒状面の大径側領域が形成され、
前記押込み型は、前記曲げ成形の完了位置まで前記パイプ状部材を押込んだ状態で、前記湾曲筒状面の大径側領域との間に前記キャビティの大径側空間を区画形成し、
前記一方の金型は、前記湾曲筒状面の小径側領域を有する金型本体と、該金型本体に対して弾性支持された弾性支持型とを有し、
前記弾性支持型は、前記型締め時、弾性力に抗して前記金型本体に近接することで、前記金型本体との間に前記キャビティの小径側空間を区画形成することを特徴とする、パイプ状部材の曲げ成形装置。
Along with mold clamping, a pair of molds formed with a curved cylindrical surface for bending a pipe-shaped member, and a pressing mold for pressing the pipe-shaped member toward the curved cylindrical surface, Bending of a pipe-shaped member in which a curved cylindrical cavity conforming to the shape after the bending of the pipe-shaped member is completed is formed in the pair of molds by pushing the pipe-shaped member with the pushing mold. A molding device,
A small diameter side region of the curved cylindrical surface is formed in the one mold, and a large diameter side region of the curved cylindrical surface is formed in the other mold,
The indentation mold defines the large-diameter side space of the cavity between the large-diameter side region of the curved cylindrical surface in a state where the pipe-shaped member is indented to the bending molding completion position ,
The one mold includes a mold body having a small-diameter side region of the curved cylindrical surface, and an elastic support mold that is elastically supported with respect to the mold body.
The elastic support die is formed close to the mold main body against an elastic force at the time of clamping, thereby forming a small-diameter side space of the cavity between the mold main body and the elastic support mold. , Bending device for pipe-shaped members.
前記押込み型と前記弾性支持型には、前記押込み型による前記パイプ状部材の押込み動作に伴い、押込み方向に直交する向きで互いに係合可能な一対の係合部が設けられており、前記パイプ状部材の曲げ成形開始時、前記一対の係合部の少なくとも一部同士が係合している、請求項1に記載のパイプ状部材の曲げ成形装置。The pushing mold and the elastic support mold are provided with a pair of engaging portions that can be engaged with each other in a direction orthogonal to the pushing direction in accordance with the pushing operation of the pipe-shaped member by the pushing mold. 2. The pipe-shaped member bending apparatus according to claim 1, wherein at least a part of the pair of engaging portions is engaged with each other at the start of bending of the shaped member.
JP2011079624A 2011-03-31 2011-03-31 Pipe-shaped bending apparatus Expired - Fee Related JP5783598B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105798620A (en) * 2016-04-15 2016-07-27 宁波金田铜管有限公司 Device for automatic bending, automatic shaping and automatic orifice flattening of copper pipes

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* Cited by examiner, † Cited by third party
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KR101598435B1 (en) * 2014-06-10 2016-02-29 최수미 Method and Apparatus for Manufacturing Pipe Bend
KR102111545B1 (en) * 2018-12-03 2020-05-18 주식회사 정우 Pipe bending device

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US1370075A (en) * 1919-05-05 1921-03-01 Harriman Nat Bank Of The City Tube-bending apparatus
US2740455A (en) * 1952-12-08 1956-04-03 Northern Indiana Brass Co Apparatus for making short radius elbows
JPH07106391B2 (en) * 1992-02-28 1995-11-15 株式会社ベンカン Curved pipe manufacturing equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105798620A (en) * 2016-04-15 2016-07-27 宁波金田铜管有限公司 Device for automatic bending, automatic shaping and automatic orifice flattening of copper pipes
CN105798620B (en) * 2016-04-15 2017-12-26 宁波金田铜管有限公司 The automatic bend pipe automatic shaping and automatic port flattening device of copper pipe

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