JP5713309B2 - Undercut processing mechanism - Google Patents

Undercut processing mechanism Download PDF

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JP5713309B2
JP5713309B2 JP2010160864A JP2010160864A JP5713309B2 JP 5713309 B2 JP5713309 B2 JP 5713309B2 JP 2010160864 A JP2010160864 A JP 2010160864A JP 2010160864 A JP2010160864 A JP 2010160864A JP 5713309 B2 JP5713309 B2 JP 5713309B2
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stopper
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正典 反本
正典 反本
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Technocrats Corp
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Description

本発明は、被プレス成形品としての素材に対して、その両壁面を相対向する内側に凹ますプレス加工を行った後、該プレス加工時に素材内に挿入していた受け側金型を素材外に取り出し可能とするアンダーカット処理機構に関する。ここでプレス加工とは、特にバーリング加工等が該当する。 The present invention is, with respect to Material as an object to be press-formed article, after the press working recessing inwardly opposed the both wall surfaces, receiving-side metal which has been inserted into the Material during the press working mold relating undercut processing mechanism that enables taken out material. Here, the press processing particularly corresponds to burring processing or the like.

従来、この種のプレス成形装置としては、例えばバーリング加工装置が知られている。すなわち、穴の縁にフランジを成形する加工装置であり、通常は金属素材に予め開けてある下穴に、該下穴の内径より大きな外径のバーリングパンチを押し込み、下穴の縁を広げながらフランジを成形するものである。   Conventionally, for example, a burring apparatus is known as this type of press molding apparatus. In other words, it is a processing device that forms a flange at the edge of the hole, and normally, a burring punch having an outer diameter larger than the inner diameter of the prepared hole is pushed into a prepared hole that has been previously drilled in a metal material, and the edge of the prepared hole is expanded. The flange is formed.

かかるバーリング加工装置においては、金属素材の被加工部に下穴を開ける穿設作業時の押圧力と、バーリング加工時のバーリングパンチによるに押圧力や引き上げ力が働くことにより、被加工部に歪みや変形が生じやすく、これらの不具合を防ぐために、金属素材の被加工部の内側にダイス（受け金型）を配置した状態で、下穴の穿設作業やバーリング加工を行う工夫がなされている。   In such a burring apparatus, the work part is distorted due to the pressing force during the drilling operation for drilling the pilot hole in the work part of the metal material and the urging force or lifting force due to the burring punch during the burring process. In order to prevent these problems, ingenuity has been made to drill holes and burring with a die (receiving die) placed inside the metal workpiece. .

ただし、金属素材が板状のものではなく閉断面を有する管状であって、特に一端が閉塞されていたり、一端が屈曲している場合には、次の問題があった。すなわち、管材の内側に対向するようなバーリング加工を行うと、管内に挿入していたパンチ受け側金型（以下、ダイスという）がバーリング形状に干渉することになり、ダイスを管外へ取り外すことができないという問題があった。   However, the metal material is not a plate-like material but a tubular shape having a closed cross section, and particularly when one end is closed or one end is bent, the following problems have occurred. That is, when burring is performed so as to face the inside of the pipe material, the punch receiving die (hereinafter referred to as a die) inserted in the pipe interferes with the burring shape, and the die is removed from the pipe. There was a problem that could not.

このような問題を解消し得る従来の技術として、例えば、特許文献１に記載されたハイドロフォームを用いた装置が知られている。すなわち、ハイドロフォーム金型に、金属管の一部を穿孔する穿孔手段と、該穿孔手段の周囲に円筒状で外側が凸状の肩部を有する分割金型を組み込み、前記金属管に内圧を負荷してハイドロフォーム加工を行った後に、前記穿孔手段により金属管の一部を穿孔した後、肩部により前記穿孔した穴の周囲を金属管の内面側に押し込み、内面側にバーリング加工する装置である。   As a conventional technique capable of solving such a problem, for example, an apparatus using a hydroform described in Patent Document 1 is known. That is, a perforating means for perforating a part of a metal tube and a split mold having a cylindrical shoulder and a convex outer portion around the perforating means are incorporated in the hydroform mold, and an internal pressure is applied to the metal tube. After carrying out hydroform processing by loading, after punching a part of the metal tube by the punching means, the periphery of the drilled hole is pushed into the inner surface side of the metal tube by the shoulder, and burring is performed on the inner surface side It is.

同様に前記問題を解消し得る従来の技術として、他にも特許文献２に記載された入れ子および鋼球を使用したバーリング加工装置が知られている。すなわち、下穴が形成された金属管の内部に傾斜部を有する治具を挿入するように配置し、治具の傾斜部を下穴の位置に合わせて治具と金属管とを固定した後、金属管の内部でこの傾斜部に下穴よりも直径の大きな鋼球を押し付けることにより、下穴の位置から鋼球を金属管の外部に押し出すことによりバーリング加工を行う装置である。   Similarly, as a conventional technique capable of solving the above-described problem, a burring apparatus using a nesting and a steel ball described in Patent Document 2 is known. That is, after a jig having an inclined portion is inserted into the inside of a metal tube in which a pilot hole is formed, and the jig and the metal tube are fixed by aligning the inclined portion of the jig with the position of the pilot hole This is a device that performs burring by pushing a steel ball having a diameter larger than that of the pilot hole to the inclined portion inside the metal pipe, thereby pushing the steel ball from the position of the pilot hole to the outside of the metal pipe.

特開２００５−２９７０６０号公報JP 2005-297060 A 特開平０８−１９７１５１号公報Japanese Patent Laid-Open No. 08-197151

しかしながら、前述したような特許文献１に記載された従来の技術では、成形サイクルが長く加工に多くの時間がかかるという問題がある。また、穿孔手段や凸状の肩部を含むパンチ圧入機構が複雑で高価なものになり、コスト高を招くという問題があった。また、高圧を生成するための特別な設備も必要となり、装置全体が大型で高価なものとなり、汎用に適さないという問題があった。   However, the conventional technique described in Patent Document 1 as described above has a problem that a molding cycle is long and a long time is required for processing. In addition, there is a problem that the punch press-in mechanism including the punching means and the convex shoulder becomes complicated and expensive, resulting in high cost. In addition, special equipment for generating high pressure is required, and the entire apparatus is large and expensive, which is not suitable for general use.

また、前述したような特許文献２に記載された従来の技術では、前記同様に成形サイクルが長く加工に多くの時間がかかるという問題がある。また、複数箇所において同時に成形加工することはできないという問題があった。さらに、金属管の外側に突出するようなバーリング形状しか成形することができないという問題があった。   In addition, the conventional technique described in Patent Document 2 as described above has a problem that the molding cycle is long as described above and a long time is required for processing. Moreover, there existed a problem that it was impossible to shape | mold simultaneously in several places. Furthermore, there is a problem that only a burring shape protruding outside the metal tube can be formed.

本発明は、前述したような従来の技術が有する問題点に着目してなされたもので、成形サイクルが短くて済み、構成が簡単で組み立てに手間と時間がかからず、コストダウンを実現することができ、コンパクトに構成することが可能となり省スペース化の要請に応じることができ、特に成形品の内側に相対向して凹むプレス加工を同時に行うことが可能なアンダーカット処理機構を提供することを目的としている。   The present invention has been made by paying attention to the problems of the conventional techniques as described above, and requires only a short molding cycle, is simple in construction, requires less labor and time for assembly, and realizes cost reduction. Provided is an undercut processing mechanism that can be compactly configured and meet the demand for space saving, and in particular, can simultaneously perform pressing that is recessed opposite to the inside of a molded product. The purpose is that.

前述した目的を達成するための本発明の要旨とするところは、以下の各項の発明に存する。
［１］被プレス成形品としての素材（１）に対して、その両壁面を相対向する内側に凹ますプレス加工を行った後、該プレス加工時に素材（１）内に挿入していた受け側金型（１０）を素材（１）外に取り出し可能とするアンダーカット処理機構であって、
前記受け側金型（１０）を駆動する駆動手段（２５０）を有し、
前記受け側金型（１０）は、前記素材（１）の一端側開口に当接させるストッパ（２０）より延び出た状態で前記素材（１）内に挿入させるものであり、該素材内に挿入させる方向と直交する厚さ方向に３分割され、前記素材（１）内に一端側開口より挿入されて前記両壁面の被加工部（２）を内側から支える一対の保持部（１１，１２）と、各保持部（１１，１２）間に挟まれた中間部（１３）と、を備え、
前記各保持部（１１，１２）は、互いに厚さ方向に離間して前記被加工部（２）に対接する支え位置と、互いに厚さ方向に近接して前記被加工部（２）より離脱する逃げ位置とに、それぞれ移動可能に一端側が前記ストッパ（２０）に支持され、
前記中間部（１３）は、基端部が前記駆動手段（２５０）に取り付けられ、前記各保持部（１１，１２）間で前記ストッパ（２０）より進退する前後方向に移動可能に支持され、前記各保持部（１１，１２）間への進入に伴い各保持部（１１，１２）を前記支え位置へ従動させる一方、前記各保持部（１１，１２）間からの退出に伴い各保持部（１１，１２）を前記逃げ位置へ従動させるものであり、
前記駆動手段（２５０）と前記ストッパ（２０）とは一体のユニットとして形成され、該ユニットを前記前後方向に往復移動可能に加工台（２６０）上に取り付けたことを特徴とするアンダーカット処理機構。 The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] Receiving material that has been inserted into the material (1) at the time of pressing after pressing the material (1) as a press-molded product into the inner sides facing each other. An undercut processing mechanism that enables the side mold (10) to be taken out of the material (1),
Drive means (250) for driving the receiving mold (10);
The receiving side mold (10) is intended to be inserted into the material (1) one end the material (1) in extends out state the stopper (20) to abut against the opening, into the material A pair of holding portions (11, 12) that are divided into three in the thickness direction perpendicular to the insertion direction and are inserted into the material (1) from one end side opening and support the processed portions (2) of the both wall surfaces from the inside. ) And an intermediate part (13) sandwiched between the holding parts (11, 12),
The holding parts (11, 12) are spaced apart from each other in the thickness direction and are in contact with the processed part (2), and are separated from the processed part (2) close to each other in the thickness direction. One end side is supported by the stopper (20) so as to be movable to the escape position to be
The intermediate portion (13) has a base end portion attached to the driving means (250) and supported so as to be movable in the front-rear direction between the holding portions (11, 12) and forward and backward from the stopper (20). Each holding portion (11, 12) is driven to the support position as it moves between the holding portions (11, 12), and each holding portion is moved away from each holding portion (11, 12). (11, 12) is driven to the escape position,
The drive means (250) and the stopper (20) are formed as an integral unit, and the unit is mounted on a processing table (260) so as to be reciprocally movable in the front-rear direction. .

［２］前記各保持部（１１，１２）の外面は、それぞれが対向する前記両壁面の被加工部（２）に適合する形状に形成されたことを特徴とする［１］に記載のアンダーカット処理機構。 [ 2 ] The under surface according to [1 ], wherein the outer surface of each holding portion (11, 12) is formed in a shape suitable for the processed portions (2) of the opposite wall surfaces. Cut processing mechanism.

［３］前記中間部（１３）の両面には、前記各保持部（１１，１２）の間に進入するに連れて各保持部（１１，１２）の間の距離を拡げるテーパーがつけられていることを特徴とする［１］または［２］に記載のアンダーカット処理機構。 [ 3 ] The both sides of the intermediate part (13) are tapered to increase the distance between the holding parts (11, 12) as they enter between the holding parts (11, 12). undercut processing mechanism according to [1] or [2], wherein the are.

［４］前記各保持部（１１，１２）の内面と、これらの間の前記中間部（１３）のテーパー面とは、該中間部（１３）の進退方向に沿って互いに相対的に移動可能に連結されていることを特徴とする［３］に記載のアンダーカット処理機構。 [ 4 ] The inner surface of each holding portion (11, 12) and the tapered surface of the intermediate portion (13) between them can move relative to each other along the advancing / retreating direction of the intermediate portion (13). The undercut processing mechanism according to [ 3 ], wherein the undercut processing mechanism is connected to the undercut processing mechanism.

［５］前記ストッパ（２０）内に、前記各保持部（１１，１２）の一端側をそれぞれ前記中間部（１３）の進退方向と交差して、互いに近接ないし離間する方向へ案内するガイド手段（２２，２３）を設けたことを特徴とする［１］，［２］，［３］または［４］に記載のアンダーカット処理機構。 [ 5 ] Guide means for guiding the one end side of each of the holding portions (11, 12) into the stopper (20) in a direction that crosses the advancing / retreating direction of the intermediate portion (13) and approaches or separates from each other. (22, 23), characterized in that the provided [1], [2], [3] or undercut processing mechanism set forth in [4].

［６］前記［１］，［２］，［３］，［４］または［５］に記載のアンダーカット処理機構によって加工されたことを特徴とする前記被プレス成形品。 [6] [1], [2], [3], [4] or the object to be press-formed article characterized in that it is processed by the undercut processing mechanism according to [5].

前記本発明は次のように作用する。
前記［１］に記載のアンダーカット処理機構によれば、素材（１）に所定のプレス加工を行う前に、受け側金型（１０）を素材（１）の一端側開口より素材（１）内に挿入するが、この挿入時には受け側金型（１０）の中間部（１３）を一対の保持部（１１，１２）間からの退出させておき、各保持部（１１，１２）を互いに厚さ方向に近接した逃げ位置に移動させておく。 The present invention operates as follows.
According to the undercut processing mechanism according to [1], before the predetermined press working Material (1), by one end opening of the receiving side mold (10) and Material (1) Rimoto Although inserted into the material (1), the intermediate part (13) of the receiving mold (10) is withdrawn from between the pair of holding parts (11, 12) at the time of this insertion, and each holding part (11, 12) are moved to the escape positions close to each other in the thickness direction.

受け側金型（１０）を素材（１）内に挿入した後、受け側金型（１０）の中間部（１３）を一対の保持部（１１，１２）間に進入させることにより、各保持部（１１，１２）を互いに厚さ方向に離間させて、素材（１）の被加工部（２）に内側から対接する支え位置に保持する。かかる状態で、素材（１）の両壁面にある被加工部（２）を同時に外側から押圧し、該両壁面をそれぞれ内側に凹ますプレス加工を行う。ここで素材（１）の両壁面は、上下の壁面でも両側の壁面でもかまわない。 After receiving-side mold (10) was inserted into Material (1) in an intermediate portion (13) by entering between the pair of holding portions (11, 12) of the receiving side mold (10), each holding portion (11, 12) by separating the in the thickness direction to each other, held to make contact support position from the inside portion to be processed (2) of material (1). In this state, the work unit at the both walls of Material (1) (2) was pressed from the outside at the same time, performs the press working recessing the both said wall inward, respectively. Wherein both wall surfaces of Material (1), may be on both sides of the wall at the upper and lower walls.

プレス加工時に、素材（１）の両壁面の被加工部（２）は、加工が妨げられない範囲でそれぞれ前記各保持部（１１，１２）によって内側から支えられている。これにより、プレス加工に伴って被加工部（２）の周囲が過度に内側に撓んで変形するおそれはなく、被加工部（２）の周囲における歪みや変形を防止することができる。 During pressing, the processed portions of the wall of Material (1) (2) is supported from the inside by the respective holding portions each in a range of processing is not prevented (11, 12). Thereby, there is no possibility that the periphery of the processed part (2) will be excessively bent inward and deformed with the press working, and distortion and deformation around the processed part (2) can be prevented.

プレス加工後は、受け側金型（１０）の中間部（１３）を一対の保持部（１１，１２）間から退出させることにより、各保持部（１１，１２）を互いに厚さ方向に近接させて、素材（１）の被加工部（２）より離脱する逃げ位置に変位させる。これにより、受け側金型（１０）は素材（１）内にて被加工部（２）に引っ掛かることなく、素材（１）外に容易に取り出すことができる。 After press working, the holding part (11, 12) is brought close to each other in the thickness direction by retracting the intermediate part (13) of the receiving mold (10) from between the pair of holding parts (11, 12). by, displacing the relief position disengaged from the machined portion of material (1) (2). Accordingly, the receiving side mold (10) without being caught on the processed section (2) in Material (1) within Material (1) can be easily taken out to the outside.

また、前記受け側金型（１０）は、素材（１）の一端側開口に当接させるストッパ（２０）より延び出た状態で素材（１）内に挿入させる。ここで各保持部（１１，１２）は、支え位置と逃げ位置とにそれぞれ移動可能に一端側がストッパ（２０）に支持される。また、中間部（１３）は、ストッパ（２０）より進退する前後方向に駆動可能に支持される。このような構成により、受け側金型（１０）をストッパ（２０）によって素材（１）内の適所に位置決めすることができる。 Moreover, the said receiving side metal mold | die (10) is inserted in a raw material (1) in the state extended from the stopper (20) contact | abutted to the opening of the one end side of a raw material (1). Here, one end side of each holding part (11, 12) is supported by the stopper (20) so as to be movable between a support position and a relief position. Further, the intermediate portion (13) is supported so as to be able to be driven in the front-rear direction to advance and retract from the stopper (20). With such a configuration, the receiving mold (10) can be positioned at an appropriate position in the material (1) by the stopper (20).

さらに、前記中間部（１３）の駆動手段（２５０）と前記ストッパ（２０）は一体のユニットとして形成され、該ユニットを前記素材（１）の前後方向に往復移動可能に加工台（２６０）上に取り付ける。これにより、前記受け側金型（１０）をストッパ（２０）と中間部（１３）の駆動手段（２５０）ごと加工台（２６０）上を移動させることで、容易に受け側金型（１０）を位置決めされた素材（１）内に挿入したり、素材（１）外に取り出すことができる。 Further, the driving means (250) of the intermediate portion (13) and the stopper (20) are formed as an integral unit, and the unit can be moved back and forth in the front-rear direction of the material (1) on the processing table (260). Attach to. Thus, the receiving mold (10) can be easily moved by moving the receiving mold (10) on the processing table (260) together with the stopper (20) and the driving means (250) of the intermediate portion (13). Can be inserted into the positioned material (1) or taken out of the material (1).

前記［２］に記載のアンダーカット処理機構によれば、前記受け側金型（１０）の各保持部（１１，１２）の外面は、それぞれが対向する前記素材（１）の両壁面の被加工部（２）に適合する形状に形成される。これにより、プレス加工時に各保持部（１１，１２）が被加工部（２）に対して歪みや変形を生じさせることがなく、被加工部（２）の所要の機能形状を得ることができる。 According to the undercut processing mechanism according to [2], the outer surface of the holding portion of the receiving-side mold (10) (11, 12), both wall surfaces of Kimoto material before the respective facing (1) It is formed in a shape that fits the workpiece (2). Thereby, the required functional shape of the processed part (2) can be obtained without causing the holding parts (11, 12) to be distorted or deformed with respect to the processed part (2) during press working. .

前記［３］に記載のアンダーカット処理機構によれば、前記受け側金型（１０）の中間部（１３）の両面には、各保持部（１１，１２）の間に進入するに連れて各保持部（１１，１２）の間の距離を拡げるテーパーがつけられている。このような簡易な構成により、中間部（１３）を各保持部（１１，１２）の間に進退させるだけで、各保持部（１１，１２）を互いに離間する支え位置と互いに近接する逃げ位置に移動させることができる。 According to the undercut processing mechanism described in [ 3 ], the both sides of the intermediate part (13) of the receiving mold (10) enter between the holding parts (11, 12). The taper which extends the distance between each holding | maintenance part (11,12) is attached. With such a simple configuration, only by moving the intermediate portion (13) forward and backward between the holding portions (11, 12), the supporting positions separating the holding portions (11, 12) and the escape positions approaching each other. Can be moved to.

前記［４］に記載のアンダーカット処理機構によれば、前記受け側金型（１０）の各保持部（１１，１２）の内面と、これらの間の中間部（１３）のテーパー面とを、該中間部（１３）の進退方向に沿って互いに相対的に移動可能に連結する。このような簡易な構成により、中間部（１３）を各保持部（１１，１２）の間にてスムーズに進退するように案内することができる。 According to the undercut processing mechanism described in [ 4 ] above, the inner surface of each holding portion (11, 12) of the receiving mold (10) and the taper surface of the intermediate portion (13) between them. The intermediate portion (13) is connected to be movable relative to each other along the advancing / retreating direction. With such a simple configuration, the intermediate portion (13) can be guided so as to smoothly advance and retract between the holding portions (11, 12).

前記［５］に記載のアンダーカット処理機構によれば、前記ストッパ（２０）内に、前記各保持部（１１，１２）の一端側をそれぞれ前記中間部（１３）の進退方向と交差して、互いに近接ないし離間する方向へ案内するガイド手段（２２，２３）を設けた。これにより、中間部（１３）を各保持部（１１，１２）の間に進退させるに伴って、各保持部（１１，１２）を互いに離間する支え位置と互いに近接する逃げ位置とに確実に案内することができる。 According to the undercut processing mechanism described in [ 5 ], one end side of each holding portion (11, 12) is crossed with the advancing / retreating direction of the intermediate portion (13) in the stopper (20). , Guide means (22, 23) for guiding in directions close to or away from each other are provided. As a result, as the intermediate portion (13) is advanced and retracted between the holding portions (11, 12), the holding portions (11, 12) are surely moved to the support positions that are separated from each other and the escape positions that are close to each other. I can guide you.

本発明に係るアンダーカット処理機構によれば、素材の両壁面を相対向する内側に凹ますプレス加工を行った後、該プレス加工時に素材内に挿入していた受け側金型を素材外に容易に取り出すことができ、成形サイクルが短くて済み、構成が簡単で組み立てに手間と時間がかからず、コストダウンを実現することができ、コンパクトに構成することが可能となり省スペース化の要請に応じることができる。 According to the undercut processing mechanism according to the present invention, after the press working recessing inwardly opposing both walls of the Material, the receiving-side mold was inserted into the Material during the press working can be easily taken out to the outside material, requires in the molding cycle is short, the configuration does not take labor and time to simple assembly, it is possible to realize cost reduction, it is possible to configure a compact Ministry It is possible to respond to requests for space.

本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の原理を示す断面図である。It is sectional drawing which shows the principle of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の組み立て工程を示す斜視図である。It is a perspective view which shows the assembly process of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の動作の仕組みを示す説明図である。It is explanatory drawing which shows the mechanism of operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の動作を中心とした成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の動作を中心とした成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の動作を中心とした成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の動作を中心とした成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第１実施の形態に係るアンダーカット処理機構の受け側金型の動作を中心とした成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. 本発明の第２実施の形態に係るアンダーカット処理機構の受け側金型の組み立て工程を示す斜視図である。It is a perspective view which shows the assembly process of the receiving side metal mold | die of the undercut process mechanism which concerns on 2nd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構の受け側金型を分解して示す斜視図である。It is a perspective view which decomposes | disassembles and shows the receiving side metal mold | die of the undercut process mechanism which concerns on 3rd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構の動作を示す斜視図である。It is a perspective view which shows operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構によりバーリング加工する管状素材を示す斜視図である。It is a perspective view which shows the tubular raw material which carries out a burring process with the undercut process mechanism which concerns on 3rd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構の成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構の成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構の成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構の成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. 本発明の第３実施の形態に係るアンダーカット処理機構の成形動作の工程を示す説明図である。It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention.

以下、図面に基づき、本発明を代表する各種実施の形態を説明する。
図１〜図８は、本発明の第１実施の形態を示している。
図１は、アンダーカット処理機構の要部である受け側金型の原理を示す断面図である。図２は、受け側金型の組み立て工程を示す斜視図である。図３は、受け側金型の動作の仕組みを示す説明図である。図４〜図８は、受け側金型の動作を中心としたアンダーカット処理機構の成形動作の工程を示す説明図である。 Hereinafter, various embodiments representing the present invention will be described with reference to the drawings.
1 to 8 show a first embodiment of the present invention.
FIG. 1 is a cross-sectional view showing the principle of a receiving mold that is a main part of an undercut processing mechanism. FIG. 2 is a perspective view showing the assembly process of the receiving mold. FIG. 3 is an explanatory diagram showing a mechanism of operation of the receiving mold. 4-8 is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism centering on operation | movement of a receiving side metal mold | die.

アンダーカット処理機構は、被プレス成形品としての素材である管状素材１に対して、その両壁面を相対向する内側に凹ますプレス加工を行った後、該プレス加工時に管状素材１内に挿入していた受け側金型１０を管状素材１外に取り出し可能とするものである。本第１実施の形態に係る管状素材１は、一端側のみ開口して他端側は塞がれた矩形断面の部材である。この管状素材１の両壁面である上下壁面に、プレス加工としてバーリング加工を施す場合を例に以下説明する。 The undercut processing mechanism presses the tubular material 1 that is the material to be pressed as a material to be pressed and dents both wall surfaces inwardly, and then inserts into the tubular material 1 during the pressing. The receiving mold 10 that has been made can be taken out of the tubular material 1. The tubular material 1 according to the first embodiment is a member having a rectangular cross section that is opened only at one end side and closed at the other end side. The case where burring processing is performed as press processing on the upper and lower wall surfaces, which are both wall surfaces of the tubular material 1, will be described as an example.

管状素材１の上下壁には、それぞれ対向する円穴２が予め汎用のパンチング等により穿設されている。前記バーリング加工とは、管状素材１の上下壁面にある円穴２の縁にそれぞれ同時に管状素材１内に突出するフランジを成形することである。図１に示すように、管状素材１に対して上下より近接可能な一対のバーリングパンチ３が配され、各バーリングパンチ３は、それぞれ図示省略した油圧シリンダのピストンロッドに取り付けられている。   Opposite circular holes 2 are previously formed in the upper and lower walls of the tubular material 1 by general-purpose punching or the like. The burring process is to form flanges that protrude into the tubular material 1 simultaneously at the edges of the circular holes 2 on the upper and lower wall surfaces of the tubular material 1. As shown in FIG. 1, a pair of burring punches 3 that can approach the tubular material 1 from above and below are arranged, and each burring punch 3 is attached to a piston rod of a hydraulic cylinder (not shown).

前記油圧シリンダの駆動によって、管状素材１の上下壁にある円穴２に各バーリングパンチ３の先端部が外側から強挿され、同時に上下の円穴２の縁に内側に向うフランジ２ａが成形される。この時、管状素材１は図示省略した治具等によって固定されている。ここで油圧シリンダ等の構成は一般的であるので詳細な説明は省略する。なお、管状素材１の具体的な材質は、アルミニウムあるいはアルミニウム合金等、プレス加工が可能な金属であれば何でも良い。   By driving the hydraulic cylinder, the tip of each burring punch 3 is forcibly inserted into the circular holes 2 on the upper and lower walls of the tubular material 1 from the outside, and at the same time, flanges 2 a facing inward are formed at the edges of the upper and lower circular holes 2. The At this time, the tubular material 1 is fixed by a jig or the like not shown. Here, since the configuration of the hydraulic cylinder and the like is common, detailed description is omitted. The specific material of the tubular material 1 may be any metal that can be pressed, such as aluminum or aluminum alloy.

図１〜図３に示すように、受け側金型１０は、管状素材１の一端側開口より挿入する方向と直交する厚さ方向に３分割されている。３分割された受け側金型１０は、管状素材１内に一端側開口より挿入されて前記上下壁面の被加工部である円穴２周囲を内側から支える一対の保持部１１，１２と、各保持部１１，１２間に挟まれた中間部１３とから成る。各保持部１１，１２と中間部１３は、３段に重なった状態で管状素材１の内部空間に合致する略立方体形状のダイスとなる。 As shown in FIGS. 1 to 3, the receiving side mold 10 is divided into three in the thickness direction orthogonal to the direction of insertion from the one end side opening of the tubular material 1. The receiving die 10 divided into three parts is inserted into the tubular material 1 from one end side opening, and a pair of holding parts 11 and 12 for supporting the periphery of the circular hole 2 which is a processed part of the upper and lower wall surfaces from the inside, The intermediate portion 13 is sandwiched between the holding portions 11 and 12. Each holding part 11, 12 and the intermediate part 13 form a substantially cube-shaped die that matches the internal space of the tubular material 1 in a state of being overlapped in three stages.

上下の各保持部１１，１２は管状素材１内において、互いに厚さ方向に離間して前記円穴２周囲に対接する支え位置と、互いに厚さ方向に近接して前記円穴２周囲より離脱する逃げ位置とに、それぞれ移動可能に支持される。中央の中間部１３は、各保持部１１，１２間で管軸方向でもある前後方向に移動可能に支持され、各保持部１１，１２間への進入に伴い各保持部１１，１２を前記支え位置へ従動させる一方、各保持部１１，１２間からの退出に伴い各保持部１１，１２を前記逃げ位置へ従動させるものである。 The upper and lower holding portions 11 and 12 are separated from each other in the thickness direction in the tubular material 1 and are separated from the circumference of the circular hole 2 close to each other in the thickness direction. Each escaping position is supported so as to be movable. The central intermediate portion 13 is supported between the holding portions 11 and 12 so as to be movable in the front-rear direction , which is also the tube axis direction , and supports the holding portions 11 and 12 as they enter between the holding portions 11 and 12. While being driven to the position, the holding parts 11 and 12 are driven to the escape position as the holding parts 11 and 12 are withdrawn.

受け側金型１０は、管状素材１の一端側開口に当接させるストッパ２０より延び出た状態で管状素材１内に挿入させるものである。図３に示すように、各保持部１１，１２は、前記支え位置と前記逃げ位置とにそれぞれ上下方向に移動可能に一端側が前記ストッパ２０に支持されている。詳しく言えば各保持部１１，１２の一端側には、それぞれ前記ストッパ２０と共に管状素材１の一端側開口に当接してストッパの役目を果す基端部１４，１５が一体成形されている。   The receiving side mold 10 is inserted into the tubular material 1 in a state of extending from the stopper 20 that is brought into contact with the one end side opening of the tubular material 1. As shown in FIG. 3, each holding portion 11, 12 is supported by the stopper 20 at one end side so as to be movable in the vertical direction between the support position and the escape position. More specifically, base end portions 14 and 15 are integrally formed on one end sides of the holding portions 11 and 12 so as to abut the stoppers 20 and the openings on the one end side of the tubular material 1 to serve as stoppers.

各基端部１４，１５は、それぞれ各保持部１１，１２の一端側にて左右に張り出す立方体形状に成形されており、ストッパ２０の間にて上下方向に移動可能に支持される。ストッパ２０は、左右に対向する一対の板材２１，２１から成る。各板材２１の内面には、それぞれ前記各保持部１１，１２の基端部１４，１５が上下方向に移動可能に案内されるガイド手段が設けられている。このガイド手段は、上側の保持部１１に対応する一対の凹溝２２，２２と、下側の保持部１２に対応する一対の凹溝２３，２３である。   Each of the base end portions 14 and 15 is formed in a cubic shape projecting left and right at one end side of each of the holding portions 11 and 12, and is supported between the stoppers 20 so as to be movable in the vertical direction. The stopper 20 is composed of a pair of plate materials 21 and 21 facing left and right. On the inner surface of each plate member 21, guide means for guiding the base end portions 14 and 15 of the holding portions 11 and 12 so as to be movable in the vertical direction is provided. The guide means includes a pair of concave grooves 22 and 22 corresponding to the upper holding portion 11 and a pair of concave grooves 23 and 23 corresponding to the lower holding portion 12.

上側の保持部１１の基端部１４の両側端面には、それぞれ前記各凹溝２２に摺動可能に嵌合する一対の凸条１６，１６が突設されている。また、下側の保持部１２の基端部１５の両側端面にも、それぞれ前記各凹溝２３に摺動可能に嵌合する一対の凸条１７，１７が突設されている。ここで凸条１６，１７は、ストッパ２０と保持部１１，１２との何れに設けても良く、何れか他方に凹溝２２，２３を設けることになる。要するに、各保持部１１，１２が互い近接ないし離間する方向へ案内される構造であれば良く、ストッパ２０側に設けられた方がガイド手段に該当する。   On both side end surfaces of the base end portion 14 of the upper holding portion 11, a pair of ridges 16, 16 that slidably fit into the respective concave grooves 22 are projected. A pair of ridges 17, 17 that slidably fit into the respective concave grooves 23 are also provided on both side end surfaces of the base end portion 15 of the lower holding portion 12. Here, the ridges 16 and 17 may be provided on either the stopper 20 or the holding portions 11 and 12, and the concave grooves 22 and 23 are provided on either one of them. In short, any structure may be used as long as the holding portions 11 and 12 are guided in directions close to or away from each other, and the one provided on the stopper 20 side corresponds to the guide means.

また、各保持部１１，１２の外面、すなわち上側の保持部１１の上面と下側の保持部１２の下面とは、それぞれが対向する前記管状素材１の上下壁面の円穴２周囲に適合する形状に形成されている。詳しくは図１，図２に示すように、各保持部１１，１２の外面には、円穴２周囲に形成されるフランジ２ａとバーリングパンチ３の先端が、それぞれフランジ２ａの高さ分だけ嵌入し得る凹部１８，１９が形成されている。   Moreover, the outer surface of each holding | maintenance part 11 and 12, ie, the upper surface of the upper holding | maintenance part 11, and the lower surface of the lower holding | maintenance part 12, fit each circumference | surroundings of the circular hole 2 of the up-and-down wall surface of the said tubular raw material 1. It is formed into a shape. As shown in detail in FIGS. 1 and 2, the flanges 2a and the burring punch 3 formed around the circular hole 2 are inserted into the outer surfaces of the holding portions 11 and 12 by the height of the flange 2a. Possible recesses 18 and 19 are formed.

図３に示すように、受け側金型１０の中間部１３は、前記ストッパ２０より進退する前後方向に駆動可能に支持される。本実施の形態では図示省略したが、後述する第２実施の形態に示したように、中間部１３の基端部は、駆動手段である油圧シリンダ２５０のピストンロッド２５１に取り付けられている。かかる油圧シリンダ２５０の駆動によって、中間部１３は、ストッパ２０内を貫通し各保持部１１，１２間に挟まれた状態で前後方向に移動し、管状素材１に一端側開口より進退するように設定されている。 As shown in FIG. 3, the intermediate portion 13 of the receiving mold 10 is supported so as to be able to be driven in the front-rear direction that advances and retracts from the stopper 20. Although not shown in the present embodiment, as shown in a second embodiment to be described later, the base end portion of the intermediate portion 13 is attached to a piston rod 251 of a hydraulic cylinder 250 that is a driving means. By driving the hydraulic cylinder 250, the intermediate portion 13 passes through the stopper 20 and moves in the front-rear direction while being sandwiched between the holding portions 11 and 12, so that the tubular material 1 advances and retreats from the opening on the one end side. Is set.

また、中間部１３は、その先端に向って漸次厚さが薄くなる先細り断面形状に形成されている。これにより、中間部１３の上下両面には、前記各保持部１１，１２の間に進入するに連れて各保持部１１，１２の間の距離を拡げるテーパーがつけられている。さらに、中間部１３のテーパー面と各保持部１１，１２の内面とは、中間部１３の進退方向に沿って互いに相対的に移動可能に連結されている。   Moreover, the intermediate part 13 is formed in the taper cross-sectional shape from which the thickness becomes thin gradually toward the front-end | tip. Thus, the upper and lower surfaces of the intermediate portion 13 are tapered so as to increase the distance between the holding portions 11 and 12 as they enter between the holding portions 11 and 12. Furthermore, the taper surface of the intermediate portion 13 and the inner surfaces of the holding portions 11 and 12 are connected to each other so as to be relatively movable along the advancing / retreating direction of the intermediate portion 13.

詳しくは図２，図３に示すように、中間部１３の上下のテーパー面には、それぞれ中心に長手方向に延びる凸条１３ａ，１３ｂが突設されている。一方、各保持部１１，１２の互いに対向する内面には、それぞれ前記凸条１３ａ，１３ｂが摺動可能に嵌合する蟻溝１１ａ，１２ａが設けられている。ここで蟻溝１１ａ，１２ａに嵌合する凸条１３ａ，１３ｂは、これらの長手方向と交差する上下方向には抜け出ることはない。なお、各保持部１１，１２の内面に凸条を設ける一方、中間部１３のテーパー面に蟻溝を設けても良い。   In detail, as shown in FIGS. 2 and 3, the upper and lower tapered surfaces of the intermediate portion 13 are respectively provided with protrusions 13 a and 13 b extending in the longitudinal direction at the center. On the other hand, dovetail grooves 11a and 12a, in which the protrusions 13a and 13b are slidably fitted, are provided on the inner surfaces of the holding portions 11 and 12 facing each other. Here, the ridges 13a and 13b fitted into the dovetail grooves 11a and 12a do not come out in the vertical direction intersecting these longitudinal directions. In addition, you may provide a dovetail groove | channel in the taper surface of the intermediate part 13, while providing a protrusion on the inner surface of each holding | maintenance part 11 and 12. FIG.

次に、第１実施の形態に係るアンダーカット処理機構の作用について説明する。
受け側金型１０を組み立てるには、図２（ａ）に示すように、ストッパ２０の一対の板材２１，２１の間に、上下に対向する各保持部１１，１２を組み付ける。すなわち、上側の保持部１１の基端部１４にある一対の凸条１６，１６を、各板材２１の内面上側にある一対の凹溝２２，２２に嵌合させる。同様に、下側の保持部１２の基端部１５にある一対の凸条１７，１７を、各板材２１の内面下側にある一対の凹溝２３，２３に嵌合させる。ここで各板材２１は、金型等の他の部材に固定されている。 Next, the operation of the undercut processing mechanism according to the first embodiment will be described.
In order to assemble the receiving side mold 10, as shown in FIG. 2A, the holding portions 11 and 12 that face each other vertically are assembled between the pair of plate materials 21 and 21 of the stopper 20. That is, the pair of ridges 16, 16 on the base end portion 14 of the upper holding portion 11 are fitted into the pair of concave grooves 22, 22 on the inner surface upper side of each plate member 21. Similarly, the pair of ridges 17 and 17 on the base end portion 15 of the lower holding portion 12 are fitted into the pair of concave grooves 23 and 23 on the lower inner surface of each plate member 21. Here, each plate 21 is fixed to another member such as a mold.

続いて図２（ｂ）に示すように、中間部１３をストッパ２０内を貫通させて、各保持部１１，１２間に挟まれる状態に挿入する。この時、中間部１３の上側のテーパー面にある凸条１３ａは、上側の保持部１１の基端部１４にある蟻溝１１ａに嵌合させる。また、中間部１３の下側のテーパー面にある凸条１３ｂは、下側の保持部１２の基端部１５にある蟻溝１２ａに嵌合させる。これにより、図２（ｃ）に示すように、受け側金型１０の組み立ては完了する。なお、中間部１３の基端部は、図示省略したが駆動手段である油圧シリンダ２５０のピストンロッド２５１（図１３参照）に取り付けられる。   Subsequently, as shown in FIG. 2 (b), the intermediate portion 13 is inserted through the stopper 20 so as to be sandwiched between the holding portions 11 and 12. At this time, the ridge 13 a on the upper tapered surface of the intermediate portion 13 is fitted into the dovetail groove 11 a in the proximal end portion 14 of the upper holding portion 11. Further, the ridge 13 b on the lower tapered surface of the intermediate portion 13 is fitted into the dovetail groove 12 a in the proximal end portion 15 of the lower holding portion 12. Thereby, as shown in FIG.2 (c), the assembly of the receiving side metal mold | die 10 is completed. Although not shown, the base end portion of the intermediate portion 13 is attached to a piston rod 251 (see FIG. 13) of a hydraulic cylinder 250 that is a driving means.

図３に示すように、受け側金型１０の各保持部１１，１２は、それぞれ支え位置と逃げ位置とに移動可能に基端部１４，１５がストッパ２０に支持される。図３（ａ）に示すように、保持部１２は、その凸条１７が嵌合している板材２１の凹溝２３に沿って上下方向に移動する。また図３（ｂ）に示すように、中間部１３は、その凸条１３ｂ（図３（ｄ）参照）が嵌合している保持部１２の蟻溝１２ａに沿って進退方向に移動する。   As shown in FIG. 3, the holding portions 11 and 12 of the receiving mold 10 are supported by stoppers 20 on the base end portions 14 and 15 so as to be movable between a support position and a relief position, respectively. As shown in FIG. 3A, the holding portion 12 moves in the vertical direction along the concave groove 23 of the plate material 21 in which the ridge 17 is fitted. Further, as shown in FIG. 3 (b), the intermediate portion 13 moves in the forward / backward direction along the dovetail groove 12a of the holding portion 12 with which the ridge 13b (see FIG. 3 (d)) is fitted.

中間部１３の両面には、各保持部１１，１２の間に進入するに連れて各保持部１１，１２の間の距離を拡げるテーパーがつけられている。従って、中間部１３を各保持部１１，１２の間に進退させるだけで、各保持部１１，１２を互いに離間する支え位置と互いに近接する逃げ位置に移動させることができる。   Both surfaces of the intermediate portion 13 are tapered so as to increase the distance between the holding portions 11 and 12 as they enter between the holding portions 11 and 12. Therefore, the holding portions 11 and 12 can be moved to the support positions that are separated from each other and the escape positions that are close to each other only by moving the intermediate portion 13 between the holding portions 11 and 12.

図３（ｃ）に示すように、中間部１３を図中の左方向に引き抜くと、保持部１２は、ストッパ２０の凹溝２３と中間部１３の凸条１３ｂ（図３（ｄ）参照）に沿って移動動作を強制され、図中の上方に移動する。なお、図３（ｄ）は、図３（ｃ）の矢印方向の断面図を示している。このような構成により、中間部１３を各保持部１１，１２の間に進退させるに伴って、各保持部１１，１２を互いに離間する支え位置と互いに近接する逃げ位置とに確実に案内することができる。   As shown in FIG. 3 (c), when the intermediate portion 13 is pulled out in the left direction in the drawing, the holding portion 12 becomes the concave groove 23 of the stopper 20 and the ridge 13b of the intermediate portion 13 (see FIG. 3 (d)). The movement operation is forced along the line and moves upward in the figure. FIG. 3D shows a cross-sectional view in the direction of the arrow in FIG. With such a configuration, as the intermediate portion 13 is moved back and forth between the holding portions 11 and 12, the holding portions 11 and 12 are surely guided to the support positions that are separated from each other and the escape positions that are close to each other. Can do.

また、各保持部１１，１２の内面と、中間部１３のテーパー面とは、該中間部１３の進退方向に沿って互いに相対的に移動可能に連結されているから、中間部１３を各保持部１１，１２の間にてスムーズに進退するように案内することができる。中間部１３は、ストッパ２０より進退する前後方向（管軸方向）に駆動可能に支持されている。また、受け側金型１０をストッパ２０によって管状素材１内の適所に位置決めすることができると共に、受け側金型１０をストッパ２０と一緒にまとめてコンパクトに支持することができる。   Moreover, since the inner surface of each holding | maintenance part 11 and 12 and the taper surface of the intermediate part 13 are connected so that it can mutually move along the advancing / retreating direction of this intermediate part 13, each intermediate | middle part 13 is hold | maintained. It is possible to guide between the portions 11 and 12 so as to smoothly advance and retreat. The intermediate portion 13 is supported so as to be drivable in the front-rear direction (tube axis direction) that advances and retreats from the stopper 20. Further, the receiving side mold 10 can be positioned at an appropriate position in the tubular material 1 by the stopper 20, and the receiving side mold 10 can be collectively supported together with the stopper 20.

次に、図４〜図８に示すように、受け側金型１０を金型に組み込んだ際の成形動作工程を説明する。図４において、受け側金型１０を、管状素材１の一端側開口に当接させるストッパ２０より延び出た状態で矢印ａ方向に管状素材１内に挿入する。この挿入時には、中間部１３を一対の保持部１１，１２間から退出させておき、各保持部１１，１２を互いに厚さ方向に近接した逃げ位置としておく。   Next, as shown in FIGS. 4 to 8, a molding operation process when the receiving mold 10 is incorporated in the mold will be described. In FIG. 4, the receiving side mold 10 is inserted into the tubular material 1 in the direction of the arrow a in a state of extending from the stopper 20 that contacts the one end side opening of the tubular material 1. At the time of this insertion, the intermediate part 13 is withdrawn from between the pair of holding parts 11 and 12, and the holding parts 11 and 12 are set to escape positions close to each other in the thickness direction.

図５において、受け側金型１０を管状素材１内に挿入した後、中間部１３を一対の保持部１１，１２間に進入させる。すると、各保持部１１，１２は、それぞれ厚さ方向に離間して、管状素材１の円穴２周囲に内側から対接する支え位置に保持される。この時、受け側金型１０の総厚さは管状素材１内寸法の厚さに合致する。なお、図５（ｂ）は、図５（ａ）の矢印方向の断面図を示している。   In FIG. 5, after the receiving mold 10 is inserted into the tubular material 1, the intermediate portion 13 is inserted between the pair of holding portions 11 and 12. Then, each holding | maintenance part 11 and 12 is spaced apart in the thickness direction, respectively, and is hold | maintained in the support position which contact | connects the circumference | surroundings of the circular hole 2 of the tubular raw material 1 from the inner side. At this time, the total thickness of the receiving side mold 10 matches the thickness of the inner dimension of the tubular material 1. FIG. 5B shows a cross-sectional view in the direction of the arrow in FIG.

図６において、管状素材１内で各保持部１１，１２を支え位置に保持した状態で、管状素材１の上下壁面にある円穴２を同時にバーリングパンチ３によって外側から押圧し、円穴２の縁をそれぞれ内側に突出させてフランジ２ａを成形するバーリング加工を行う。この時、円穴２周囲は、それぞれフランジ２ａの加工が妨げられない範囲で各保持部１１，１２によって内側から支えられる。これにより、バーリング加工に伴って円穴２周囲が過度に内側に撓んで変形するおそれはなく、円穴２周囲における歪みや変形を防止することができる。なお、図６（ｂ）は、図６（ａ）の矢印方向の断面図を示している。   In FIG. 6, in a state where the holding portions 11 and 12 are held in the support position in the tubular material 1, the circular holes 2 on the upper and lower wall surfaces of the tubular material 1 are simultaneously pressed from the outside by the burring punch 3, Burring is performed to form the flange 2a with the edges projecting inward. At this time, the periphery of the circular hole 2 is supported from the inside by the holding portions 11 and 12 within a range in which the processing of the flange 2a is not hindered. Thereby, there is no possibility that the circumference of the circular hole 2 is excessively bent inward with the burring process, and the distortion and deformation around the circular hole 2 can be prevented. FIG. 6B shows a cross-sectional view in the direction of the arrow in FIG.

図７において、バーリング加工後に、中間部１３を一対の保持部１１，１２間から退出させることにより、各保持部１１，１２を互いに厚さ方向に近接させて、管状素材１の被加工部２より離脱する逃げ位置に移動させる。これにより、受け側金型１０の総厚さがバーリング寸法を越えて縮むことになる。従って図８に示すように、受け側金型１０を管状素材１内でフランジ２ａに引っ掛かることなく、管状素材１外に容易に取り出すことができる。なお、図７（ｂ）は、図７（ａ）の矢印方向の断面図を示している。   In FIG. 7, after burring, the intermediate portion 13 is withdrawn from between the pair of holding portions 11, 12, so that the holding portions 11, 12 are brought close to each other in the thickness direction, and the processed portion 2 of the tubular material 1. Move to the escape position to leave more. As a result, the total thickness of the receiving mold 10 shrinks beyond the burring dimension. Therefore, as shown in FIG. 8, the receiving mold 10 can be easily taken out of the tubular material 1 without being caught by the flange 2 a in the tubular material 1. FIG. 7B shows a cross-sectional view in the direction of the arrow in FIG.

図９は、本発明の第２実施の形態を示している。
本実施の形態では、前述した第１実施の形態に係る受け側金型１０と基本的な構成は共通するがストッパ２０がなく、各保持部１１，１２を上下方向に案内する凹溝２２，２３もなく、一対のピン部材２５，２５によってガイド手段が構成されている。なお、ストッパは図９中では図示省略したが、各ピン部材２５を支持する部材が各保持部１１，１２の基端部１４，１５と共にストッパとなる。 FIG. 9 shows a second embodiment of the present invention.
In the present embodiment, the basic configuration is the same as that of the receiving mold 10 according to the first embodiment described above, but there is no stopper 20 and the concave grooves 22 that guide the holding portions 11 and 12 in the vertical direction. 23, a pair of pin members 25 and 25 constitute a guide means. Although the stopper is not shown in FIG. 9, a member that supports each pin member 25 becomes a stopper together with the base end portions 14 and 15 of the holding portions 11 and 12.

上側の保持部１１の基端部１４の両側には、それぞれ上下方向に貫通する一対のガイド孔２６，２６が穿設されている。また、下側の保持部１２の基端部１５の両側にも、それぞれ上下方向に貫通する一対のガイド孔２７，２７が穿設されている。これらのガイド孔２６，２７に前記ピン部材２５が相対的に移動可能に挿通した状態で、前記ピン部材２５は図示省略したストッパに支持されている。なお、上下の基端部１５，１６同士が互いに対向する面には、それぞれ中間部１３の先端側が嵌入する凹部２８，２９が形成されている。   A pair of guide holes 26 are formed on both sides of the base end portion 14 of the upper holding portion 11 so as to penetrate in the vertical direction. Also, a pair of guide holes 27 are formed on both sides of the base end portion 15 of the lower holding portion 12 so as to penetrate in the vertical direction. The pin member 25 is supported by a stopper (not shown) in a state where the pin member 25 is inserted into the guide holes 26 and 27 so as to be relatively movable. In addition, in the surfaces where the upper and lower base end portions 15 and 16 are opposed to each other, concave portions 28 and 29 into which the distal end side of the intermediate portion 13 is respectively inserted are formed.

図９（ａ）に示すように、一対のピン部材２５，２５に対して、上下から各保持部１１，１２のガイド孔２６，２７を貫通させる。続いて図９（ｂ）に示すように、中間部１３を各保持部１１，１２の凹部２８，２９から各保持部１１，１２間に挟まれる状態に挿入する。すると、図９（ｃ）に示すように、受け側金型１０の組み立ては完了する。本第２実施の形態に係る受け側金型１０によれば、各保持部１１，１２は互い近接ないし離間する方向へとピン部材２５の軸方向である上下方向に沿って案内されることになる。なお、第１実施の形態と同種の部位には同一符号を付して重複した説明を省略する。   As shown in FIG. 9A, the guide holes 26 and 27 of the holding portions 11 and 12 are passed through the pair of pin members 25 and 25 from above and below. Subsequently, as shown in FIG. 9 (b), the intermediate portion 13 is inserted into the state sandwiched between the holding portions 11 and 12 from the recesses 28 and 29 of the holding portions 11 and 12. Then, as shown in FIG.9 (c), the assembly of the receiving side metal mold | die 10 is completed. According to the receiving side mold 10 according to the second embodiment, the holding portions 11 and 12 are guided along the vertical direction which is the axial direction of the pin member 25 in the direction of approaching or separating from each other. Become. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 1st Embodiment, and the overlapping description is abbreviate | omitted.

図１０〜図１７は、本発明の第３実施の形態を示している。
本実施の形態では、前述した第１実施の形態に係る受け側金型１０と基本的な構成は共通するが、アンダーカット処理機構の装置全体を図示している点と、被プレス成形品としての管状素材の形状が異なっている。 10 to 17 show a third embodiment of the present invention.
In the present embodiment, the basic configuration is the same as that of the receiving mold 10 according to the first embodiment described above, but the entire apparatus of the undercut processing mechanism is illustrated, and as a pressed product The shape of the tubular material is different.

図１０は、アンダーカット処理機構の要部である受け側金型を分解して示す斜視図である。図１１は、受け側金型の動作を示す斜視図である。図１２は、管状素材の加工前と加工後を示す斜視図である。図１３〜図１７は、受け側金型の動作を中心としたアンダーカット処理機構の成形動作の工程を示す説明図である。   FIG. 10 is an exploded perspective view showing a receiving mold that is a main part of the undercut processing mechanism. FIG. 11 is a perspective view showing the operation of the receiving mold. FIG. 12 is a perspective view showing the tubular material before and after processing. 13-17 is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism centering on operation | movement of a receiving side metal mold | die.

本第３実施の形態に係る管状素材５は、図１２に示すように、矩形断面（閉断面）を有する押出材を所定の長さに切断し、その略中央で所定の角度だけ折り曲げた部材である。管状素材５の上下壁面には、それぞれ外側に張り出すリブ６が長手方向に延びるように形成されている。このリブ６の両側縁にかかる大きさの円穴７が、一端側開口に近い位置に予め穿設されている。本実施の形態でも、プレス加工として前記円穴７にバーリング加工を施す場合を例に説明する。   As shown in FIG. 12, the tubular material 5 according to the third embodiment is a member obtained by cutting an extruded material having a rectangular cross section (closed cross section) into a predetermined length and bending it at a predetermined angle at a substantially center thereof. It is. Ribs 6 projecting outward are formed on the upper and lower wall surfaces of the tubular material 5 so as to extend in the longitudinal direction. A circular hole 7 having a size on both side edges of the rib 6 is previously drilled at a position close to the one end side opening. Also in this embodiment, a case where burring processing is performed on the circular hole 7 as press processing will be described as an example.

図１０に示すように、受け側金型１００は、前記第１実施の形態に係る受け側金型１０との基本的な構成は共通しており、管状素材５の一端側開口より挿入する方向と直交する厚さ方向に３分割されている。かかる３分割された受け側金型１００は、管状素材５内に一端側開口より挿入されて上下壁面の被加工部である円穴７周囲を内側から支える一対の保持部１１０，１２０と、各保持部１１０，１２０間に挟まれた中間部１３０とから成る。 As shown in FIG. 10, the receiving die 100 has the same basic configuration as the receiving die 10 according to the first embodiment, and is inserted in the opening on the one end side of the tubular material 5. It is divided into three in the thickness direction orthogonal to. The three-part receiving side mold 100 is inserted into the tubular material 5 from one end side opening, and a pair of holding parts 110 and 120 that support the periphery of the circular hole 7 that is a processed part of the upper and lower wall surfaces from the inside, The intermediate portion 130 is sandwiched between the holding portions 110 and 120.

上側の保持部１１０の基端部１４０の両側端面には、それぞれストッパ２００を構成する板材２１０に設けられた凹溝２２０に摺動可能に嵌合する一対の凸条１６０，１６０が突設されている。また、下側の保持部１２０の基端部１５０の両側端面にも、それぞれ前記凹溝２２０に摺動可能に嵌合する一対の凸条１７０，１７０が突設されている。   A pair of ridges 160, 160 that slidably fit into concave grooves 220 provided in the plate material 210 that constitutes the stopper 200 are projected from both end surfaces of the base end portion 140 of the upper holding portion 110. ing. In addition, a pair of ridges 170, 170 that slidably fit in the concave groove 220 are also provided on both end surfaces of the base end portion 150 of the lower holding portion 120.

また、各保持部１１０，１２０の外面、すなわち上側の保持部１１０の上面と下側の保持部１２０の下面とは、それぞれが対向する前記管状素材５の上下壁面の円穴７周囲に適合する形状に形成されている。各保持部１１０，１２０の外面には、円穴７周囲に形成されるフランジ７ａとバーリングパンチ３の先端が、それぞれフランジ７ａの所定の高さ分だけ嵌入し得る凹部１８０，１９０が形成されている。   Further, the outer surfaces of the holding portions 110 and 120, that is, the upper surface of the upper holding portion 110 and the lower surface of the lower holding portion 120 are fitted around the circular holes 7 on the upper and lower wall surfaces of the tubular material 5 facing each other. It is formed into a shape. On the outer surface of each holding part 110, 120 is formed recesses 180, 190 into which the flange 7a formed around the circular hole 7 and the tip of the burring punch 3 can be inserted by a predetermined height of the flange 7a, respectively. Yes.

図１１に示すように、受け側金型１００の中間部１３０は、前記ストッパ２００より進退する前後方向に駆動可能に支持される。後述するが中間部１３０の基端部は、駆動手段である油圧シリンダ２５０のピストンロッド２５１に取り付けられている。かかる油圧シリンダ２５０の駆動によって、中間部１３０は、ストッパ２００内を貫通し各保持部１１０，１２０間に挟まれた状態で前後方向に移動し、管状素材５に一端側開口より進退するように設定されている。 As shown in FIG. 11, the intermediate part 130 of the receiving mold 100 is supported so as to be able to be driven in the front-rear direction that advances and retracts from the stopper 200. As will be described later, the base end portion of the intermediate portion 130 is attached to a piston rod 251 of a hydraulic cylinder 250 which is a driving means. By driving the hydraulic cylinder 250, the intermediate portion 130 passes through the stopper 200 and moves in the front-rear direction while being sandwiched between the holding portions 110 and 120, so that the tubular material 5 advances and retreats from the one end side opening. Is set.

また、中間部１３０の上下のテーパー面と各保持部１１０，１２０の内面とは、中間部１３０の進退方向に沿って互いに相対的に移動可能に連結されている。すなわち、中間部１３０の上下のテーパー面には、それぞれ中心に長手方向に延びる凸条１３０ａ，１３０ｂが突設されている。一方、各保持部１１０，１２０の互いに対向する内面には、それぞれ前記凸条１３０ａ，１３０ｂが摺動可能に嵌合する蟻溝１１０ａ，１２０ａが設けられている。なお、各保持部１１０，１２０の内面に凸条を設ける一方、中間部１３０のテーパー面に蟻溝を設けても良い。   In addition, the upper and lower tapered surfaces of the intermediate portion 130 and the inner surfaces of the holding portions 110 and 120 are connected to each other so as to be relatively movable along the advancing and retreating direction of the intermediate portion 130. In other words, the upper and lower tapered surfaces of the intermediate portion 130 are provided with protrusions 130a and 130b extending in the longitudinal direction at the center. On the other hand, dovetail grooves 110a and 120a into which the protruding strips 130a and 130b are slidably fitted are provided on the inner surfaces of the holding portions 110 and 120 facing each other. In addition, while providing a protruding item | line on the inner surface of each holding | maintenance part 110,120, you may provide a dovetail groove in the taper surface of the intermediate part 130. FIG.

図１３に示すように、中間部１３０の駆動手段である油圧シリンダ２５０と前記ストッパ２００は、一体のユニットとして形成されている。油圧シリンダ２５０のピストンロッド２５１が出没する前端部にはホルダー２５２が固定されており、このホルダー２５２の先端に前記ストッパ２００が固定されている。ピストンロッド２５１の先端には前記受け側金型１００の中間部１３０が取り付けられている。   As shown in FIG. 13, the hydraulic cylinder 250, which is a driving means of the intermediate portion 130, and the stopper 200 are formed as an integral unit. A holder 252 is fixed to the front end of the hydraulic cylinder 250 where the piston rod 251 protrudes and retracts, and the stopper 200 is fixed to the tip of the holder 252. An intermediate portion 130 of the receiving mold 100 is attached to the tip of the piston rod 251.

前記ユニットは、加工台２６０上にて直線方向に往復移動可能に取り付けられている。加工台２６０は、前記管状素材５の傾斜して位置決めされた一端側開口の前後方向と同一方向に傾斜する支持面２６１を有している。この支持面２６１上に前記ユニットは、管状素材５の前後方向に往復移動可能に取り付けられている。これにより、受け側金型１００をストッパ２００と油圧シリンダ２５０ごと加工台２６０上を移動させることで、容易に受け側金型１００を管状素材５内に挿入したり、管状素材５外に取り出すことができる。 The unit is mounted on the processing table 260 so as to be able to reciprocate in a linear direction. The processing table 260 has a support surface 261 that is inclined in the same direction as the front-rear direction of the one end side opening of the tubular material 5 that is positioned at an inclination. The unit is mounted on the support surface 261 so as to be reciprocally movable in the front-rear direction of the tubular material 5. Thereby, the receiving mold 100 is easily inserted into the tubular material 5 or removed from the tubular material 5 by moving the receiving mold 100 together with the stopper 200 and the hydraulic cylinder 250 on the processing table 260. Can do.

次に、図１３〜図１７に示すように、受け側金型１００の成形動作工程を説明する。図１３において、受け側金型１００を、管状素材５の一端側開口に当接させるストッパ２００より延び出た状態で管状素材５内に挿入する。この挿入時には、中間部１３０を一対の保持部１１０，１２０間から退出させておき、各保持部１１０，１２０を互いに厚さ方向に近接した逃げ位置としておく。   Next, as shown in FIGS. 13 to 17, a molding operation process of the receiving mold 100 will be described. In FIG. 13, the receiving mold 100 is inserted into the tubular material 5 in a state of extending from the stopper 200 that abuts against the opening on the one end side of the tubular material 5. At the time of this insertion, the intermediate part 130 is withdrawn from between the pair of holding parts 110 and 120, and the holding parts 110 and 120 are set to escape positions close to each other in the thickness direction.

図１４において、受け側金型１００を管状素材５内に挿入した後、図１５において、油圧シリンダ２５０の駆動により中間部１３０を一対の保持部１１０，１２０間に進入させる。すると、各保持部１１０，１２０は、それぞれ厚さ方向に離間して、管状素材５の円穴７周囲に内側から対接する支え位置に保持される。この時、受け側金型１００の総厚さは管状素材５内寸法の厚さに合致する。   In FIG. 14, after the receiving mold 100 is inserted into the tubular material 5, the intermediate portion 130 is caused to enter between the pair of holding portions 110 and 120 by driving the hydraulic cylinder 250 in FIG. 15. Then, each holding | maintenance part 110,120 is spaced apart in the thickness direction, respectively, and is hold | maintained in the support position which contacts the circumference | surroundings of the circular hole 7 of the tubular raw material 5 from the inner side. At this time, the total thickness of the receiving-side mold 100 matches the thickness of the inner dimension of the tubular material 5.

図１６において、管状素材５内で各保持部１１０，１２０を支え位置に保持した状態で、管状素材５の上下壁面にある円穴７を同時にバーリングパンチ３によって外側から押圧し、円穴７の縁をそれぞれ内側に突出させてフランジ７ａ（図１２参照）を成形するバーリング加工を行う。この時、円穴７周囲は、それぞれフランジ７ａの加工が妨げられない範囲で各保持部１１０，１２０によって内側から支えられる。   In FIG. 16, in a state where the holding portions 110 and 120 are held in the support position in the tubular material 5, the circular holes 7 on the upper and lower wall surfaces of the tubular material 5 are simultaneously pressed from the outside by the burring punch 3. Burring is performed to project the flange 7a (see FIG. 12) with the edges protruding inward. At this time, the circumference of the circular hole 7 is supported from the inside by the holding portions 110 and 120 within a range in which the processing of the flange 7a is not hindered.

図１７において、バーリング加工後は、油圧シリンダ２５０の駆動により中間部１３０を一対の保持部１１０，１２０間から退出させることにより、各保持部１１０，１２０を互いに厚さ方向に近接させて、管状素材５の円穴７周囲より離脱する逃げ位置に変位させる。これにより、受け側金型１００の総厚さがバーリング寸法を越えて縮むことになり、管状素材５外に容易に取り出すことができる。   In FIG. 17, after the burring process, the intermediate portion 130 is retracted from between the pair of holding portions 110 and 120 by driving the hydraulic cylinder 250, so that the holding portions 110 and 120 are brought close to each other in the thickness direction. The material 5 is displaced to the escape position where the material 5 is separated from the periphery of the circular hole 7. As a result, the total thickness of the receiving mold 100 shrinks beyond the burring dimension and can be easily taken out of the tubular material 5.

なお、本発明の実施の形態を図面によって説明してきたが、具体的な構成は前述した各実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲における変更や追加があっても本発明に含まれる。例えば、管状素材１，５や被加工部である円穴２、７の形状は、具体的に図示したものに限定されるわけではない。また、本アンダーカット処理機構によって加工される被プレス成形品には、管状素材１，５のように完全に管である閉鎖断面の素材に限らず、略Ｃ字形断面や略コ字形断面のような素材も含まれる。また、管状素材は、少なくとも一端側が開口していれば、他端側は閉じていても良い。   Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and changes and additions may be made without departing from the scope of the present invention. It is included in the present invention. For example, the shapes of the tubular materials 1, 5 and the circular holes 2, 7 that are parts to be processed are not limited to those specifically illustrated. In addition, the press-formed product processed by the undercut processing mechanism is not limited to a closed cross-section material such as a tubular material 1 or 5, but a substantially C-shaped cross section or a substantially U-shaped cross section. Including other materials. Moreover, as long as at least one end side is opening the tubular raw material, the other end side may be closed.

アンダーカット処理機構は、予め金型に組み込んだ形でユニットとして構成することができ、作業効率が良く高効率に素材の両壁面にて内側に相対向するバーリング加工を行うことができ、素材の被加工部が歪んだり変形したりすることなく、加工精度の高い成形品を量産するという用途・機能に適する。 Undercut processing mechanism in advance mold shape at can be configured as a unit incorporating, you can perform burring which faces inwardly at both wall surfaces of Material well efficient work efficiency, containing Suitable for applications and functions to mass-produce molded parts with high processing accuracy without distorting or deforming the workpiece.

１…管状素材
２…円穴
２ａ…フランジ
３…バーリングパンチ
５…管状素材
６…リブ
７…円穴
１０…受け側金型
１１…保持部
１１ａ…蟻溝
１２…保持部
１２ａ…蟻溝
１３…中間部
１３ａ…凸条
１３ｂ…凸条
１４…基端部
１５…基端部
１６…凸条
１７…凸条
１８…凹部
１９…凹部
２０…ストッパ
２１…板材
２２…凹溝
２３…凹溝
２５…ピン部材
２７…ガイド孔
２８…凹部
２９…凹部
１００…受け側金型
１１０，１２０…保持部
１３０…中間部
１３０ａ，１３０ｂ…凸条
１４０…基端部
１５０…基端部
１６０…凸条
１７０…凸条
１８０…凹部
２００…ストッパ
２２０…凹溝
２５０…油圧シリンダ
２５１…ピストンロッド
２５２…ホルダー
２６０…加工台
２６１…支持面 DESCRIPTION OF SYMBOLS 1 ... Tubular material 2 ... Circular hole 2a ... Flange 3 ... Burring punch 5 ... Tubular material 6 ... Rib 7 ... Circular hole 10 ... Receiving side metal mold 11 ... Holding part 11a ... Dovetail groove 12 ... Holding part 12a ... Dovetail groove 13 ... Intermediate part 13a ... convex strip 13b ... convex strip 14 ... base end portion 15 ... base end portion 16 ... convex strip 17 ... convex strip 18 ... concave portion 19 ... concave portion 20 ... stopper 21 ... plate material 22 ... concave groove 23 ... concave groove 25 ... Pin member 27 ... guide hole 28 ... concave 29 ... concave 100 ... receiving side mold 110, 120 ... holding portion 130 ... intermediate portion 130a, 130b ... projection strip 140 ... base end portion 150 ... base end portion 160 ... projection strip 170 ... Convex ridge 180 ... Concavity 200 ... Stopper 220 ... Concave groove 250 ... Hydraulic cylinder 251 ... Piston rod 252 ... Holder 260 ... Work table 261 ... Support surface

Claims (6)

被プレス成形品としての素材に対して、その両壁面を相対向する内側に凹ますプレス加工を行った後、該プレス加工時に素材内に挿入していた受け側金型を素材外に取り出し可能とするアンダーカット処理機構であって、
前記受け側金型を駆動する駆動手段を有し、
前記受け側金型は、前記素材の一端側開口に当接させるストッパより延び出た状態で前記素材内に挿入させるものであり、該素材内に挿入させる方向と直交する厚さ方向に３分割され、前記素材内に一端側開口より挿入されて前記両壁面の被加工部を内側から支える一対の保持部と、各保持部間に挟まれた中間部と、を備え、
前記各保持部は、互いに厚さ方向に離間して前記被加工部に対接する支え位置と、互いに厚さ方向に近接して前記被加工部より離脱する逃げ位置とに、それぞれ移動可能に一端側が前記ストッパに支持され、
前記中間部は、基端部が前記駆動手段に取り付けられ、前記各保持部間で前記ストッパより進退する前後方向に移動可能に支持され、前記各保持部間への進入に伴い各保持部を前記支え位置へ従動させる一方、前記各保持部間からの退出に伴い各保持部を前記逃げ位置へ従動させるものであり、
前記駆動手段と前記ストッパとは一体のユニットとして形成され、該ユニットを前記前後方向に往復移動可能に加工台上に取り付けたことを特徴とするアンダーカット処理機構。 After pressing the material to be pressed into the inner wall facing each other, the receiving mold that was inserted into the material at the time of pressing can be taken out of the material. Undercut processing mechanism
Drive means for driving the receiving mold,
The receiving-side mold is intended to be inserted into said material in a state of extending out from the stopper to abut on the one end side opening of the material, three portions in the thickness direction perpendicular to the direction to insert into the material A pair of holding parts that are inserted into the material from one end side opening and support the processed parts of both wall surfaces from the inside, and an intermediate part sandwiched between the holding parts,
Each holding portion is movably connected to a supporting position that is spaced apart from each other in the thickness direction and is in contact with the processed portion, and a clearance position that is adjacent to each other in the thickness direction and is separated from the processed portion. The side is supported by the stopper,
The intermediate portion is attached to the driving means at the base end, and is supported so as to be movable in the front-rear direction between the holding portions so as to advance and retreat from the stopper. While being driven to the support position, each holding part is driven to the escape position as it is withdrawn from between the holding parts.
The undercut processing mechanism, wherein the driving means and the stopper are formed as an integral unit, and the unit is mounted on a processing table so as to be reciprocally movable in the front-rear direction. 前記各保持部の外面は、それぞれが対向する前記両壁面の被加工部に適合する形状に形成されたことを特徴とする請求項１に記載のアンダーカット処理機構。 2. The undercut processing mechanism according to claim 1, wherein an outer surface of each of the holding portions is formed in a shape that fits to the processed portions of the two wall surfaces facing each other. 前記中間部の両面には、前記各保持部の間に進入するに連れて各保持部の間の距離を拡げるテーパーがつけられていることを特徴とする請求項１または２に記載のアンダーカット処理機構。 Wherein on both sides of the middle portion, according the to claim 1 or 2 to be characterized in that tapered to widen the distance between the holding portions brought to enter between the holding portions Undercut processing mechanism. 前記各保持部の内面と、これらの間の前記中間部のテーパー面とは、該中間部の進退方向に沿って互いに相対的に移動可能に連結されていることを特徴とする請求項３に記載のアンダーカット処理機構。 Wherein the inner surface of the holding portion, and the tapered surface of the intermediate portion between these, in Claim 3, characterized in that along the moving direction of the intermediate portion is relatively movably connected to each other The undercut processing mechanism described. 前記ストッパ内に、前記各保持部の一端側をそれぞれ前記中間部の進退方向と交差して、互いに近接ないし離間する方向へ案内するガイド手段を設けたことを特徴とする請求項１，２，３または４に記載のアンダーカット処理機構。 A guide means is provided in the stopper for guiding one end side of each holding portion in a direction that crosses the advancing and retreating direction of the intermediate portion and approaches or separates from each other. 3 or undercut processing mechanism according to 4. 前記請求項１，２，３，４または５に記載のアンダーカット処理機構によって加工されたことを特徴とする前記被プレス成形品。 Claim 1, 2, 3, wherein the press-molded article characterized in that it is processed by the undercut processing mechanism according to 4 or 5.
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