JP2010094725A - Hole punching mold - Google Patents

Hole punching mold Download PDF

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JP2010094725A
JP2010094725A JP2008269756A JP2008269756A JP2010094725A JP 2010094725 A JP2010094725 A JP 2010094725A JP 2008269756 A JP2008269756 A JP 2008269756A JP 2008269756 A JP2008269756 A JP 2008269756A JP 2010094725 A JP2010094725 A JP 2010094725A
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die
workpiece
punching
hole
mold
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Makoto Umezawa
誠 梅澤
Hitoshi Tsuyose
仁志 強▲瀬▼
Yoshitaka Hishiyama
芳隆 菱山
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SHODA SEISAKUSHO KK
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SHODA SEISAKUSHO KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hole punching mold capable of reducing sagging deformation liable to occur on the peripheral part of a punched hole, and forming a highly accurate punched hole when forming the punched hole on a hollow-shaped workpiece W the one end of which is opened. <P>SOLUTION: A die mold is made into a fixed die mold (1A) which has a relief through part (4) on the one side of which is formed into the punched hole and is controlled in movement to the longitudinal direction of the workpiece on one side and a slide die mold (1B) which is movable between a standby position in the longitudinal direction of the workpiece and a predetermined position on the other side, has slidable inclined planes (5, 6) which are inclined at the same angle to the longitudinal direction of the workpiece on the side of the center of the workpiece of the sides of the respective tip parts, arranged putting in side by side in the punching direction so as to be brought into contact with each other through the inclined planes (5, 6) and is formed so that parts on the opposite side of the peripheral part of the through parts (4) and a relief recessed part (4) are made in close contact with the inside of the workpiece (W) in the state where the slide die mold (1B) is slid to the predetermined position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、一端が開口された中空形状のワークに高精度な打抜き穴を形成することができる穴打抜き金型に関する。   The present invention relates to a hole punching die capable of forming a highly accurate punching hole in a hollow workpiece having one end opened.

一端が開口された中空形状の部品の一例として、自動車ステアリング用のアッパーシャフト（以下、アウターシャフト10と称す）が挙げられる。
アウターシャフト10（ワークＷ）は、図４に示したように、ワーク長手方向の一端部ＷＬに内径スプライン部を、反対側の他端部ＷＲに雄セレーション部を、長手方向中央部ＷＭにキーロック穴11を有する。この雄セレーション部には、図示しないステアリングホイールが連結され、キーロック穴11にはハンドルロック用キーが取付けされる。キーロック穴11が形成される長手方向中央部ＷＭの内径は、一端部ＷＬおよび他端部ＷＲよりも大きい。 An example of a hollow-shaped part having one end opened is an automobile steering upper shaft (hereinafter referred to as an outer shaft 10).
As shown in FIG. 4, the outer shaft 10 (work W) has an inner diameter spline portion at one end WL in the work longitudinal direction, a male serration portion at the other end WR on the opposite side, and a key at the longitudinal central portion WM. A lock hole 11 is provided. A steering wheel (not shown) is connected to the male serration portion, and a handle lock key is attached to the key lock hole 11. The inner diameter of the longitudinal center WM in which the key lock hole 11 is formed is larger than the one end WL and the other end WR.

このようなアウターシャフトを得るには、特許文献１の場合、図８に示されるように、円筒状の素材25を用い、長手方向中央部ＷＭには縮径加工を施さず、中間素材を経て製造している。すなわち特許文献１の場合には、先ずワーク長手方向の他端部ＷＲ側にプレス押し込み加工あるいはロータリースエージング加工等の縮径加工を施し、縮径部の内径が最終形状の雄セレーション部30よりも大きい第１中間素材26を得る。次いで、ワーク長手方向の一端部ＷＬ側に同様な縮径加工を施し、縮径部の内径が最終形状の内径スプライン部（特許文献１では雌セレーション部という）29と一致する第２中間素材27を得、この第２中間素材27の一端部ＷＬ内に内径スプライン部29を形成して第３中間素材28とする。この一端部ＷＬ内に内径スプライン部29を形成された第３中間素材28の他端部ＷＲ側に再度、縮径加工を施して雄セレーション部30や雄ねじ部31を形成し、アウターシャフト10を得ている。   In order to obtain such an outer shaft, in the case of Patent Document 1, as shown in FIG. 8, a cylindrical material 25 is used, and the central portion WM in the longitudinal direction is not subjected to diameter reduction processing, and passes through an intermediate material. Manufacture. That is, in the case of Patent Document 1, first, diameter reduction processing such as press indentation processing or rotary swaging processing is performed on the other end WR side in the workpiece longitudinal direction, and the inner diameter of the diameter reduction portion is from the male serration portion 30 having the final shape. The first intermediate material 26 having a larger length is obtained. Next, the same diameter reduction process is performed on the one end WL side in the workpiece longitudinal direction, and the second intermediate material 27 in which the inner diameter of the reduced diameter part coincides with the inner diameter spline part 29 (referred to as a female serration part in Patent Document 1). An inner diameter spline portion 29 is formed in one end portion WL of the second intermediate material 27 to form a third intermediate material 28. The third intermediate material 28 in which the inner diameter spline portion 29 is formed in the one end portion WL is subjected to diameter reduction processing again on the other end portion WR side to form the male serration portion 30 and the male screw portion 31, and the outer shaft 10 is It has gained.

また、特許文献１に記載の場合、第３中間素材28の長手方向中央部ＷＭにキーロック穴11を削り加工等で形成するとしている。
このように一端が開口された中空形状のワークＷに対し、高精度なキーロック穴11を削り加工で形成すると、時間がかかり、コストと製造効率の点で難がある。
一方、一端が開口された中空形状のワークＷに対し、打抜き穴などを形成する際、打抜き部のバリ除去加工を不要としたプレス金型およびその金型によるプレス加工方法が提案されている（特許文献２）。 In addition, in the case of Patent Document 1, the key lock hole 11 is formed in the longitudinal center portion WM of the third intermediate material 28 by cutting or the like.
If the highly accurate key lock hole 11 is formed by cutting the hollow workpiece W having one end opened in this way, it takes time and is difficult in terms of cost and manufacturing efficiency.
On the other hand, when a punched hole or the like is formed in a hollow workpiece W having an open end, a press die that eliminates the need to remove burrs at the punched portion and a press working method using the die have been proposed ( Patent Document 2).

特許文献２のプレス金型は、図６（ａ）、（ｂ）に示したように、ワークＷに対して打抜き部を形成する逃げ凹部９ａを有する型形成金型９（下部金型）と、型形成金型９に配設されたワークＷを上方から支持するワーク支持金型（上部金型）と、逃げ凹部９ａに対応し、ワークＷの内部に配設されるピン７と、該ピン７をワークＷの内部から外部に移動させ、逃げ凹部９ａと合致させるスライド可能なスライド金型８とを備える。
特開平１１−２４７８３５号公報 特開平６−３９４５５号公報 As shown in FIGS. 6A and 6B, the press die of Patent Document 2 includes a die forming die 9 (lower die) having a relief recess 9a that forms a punched portion with respect to the workpiece W. A workpiece supporting mold (upper mold) for supporting the workpiece W arranged on the mold forming die 9 from above, a pin 7 corresponding to the relief recess 9a and arranged inside the workpiece W, A slidable slide mold 8 is provided to move the pin 7 from the inside of the workpiece W to the outside and match the escape recess 9a.
Japanese Patent Laid-Open No. 11-247835 JP-A-6-39455

しかしながら、特許文献２のプレス金型は、ワークＷに対して一端から離れた部分に打抜き部を形成しようとすると、打抜き部を形成するピンを介してスライド金型８に大きな曲げモーメントが作用する。したがって、図４に示したようなワークＷの長手方向中央部ＷＭにキーロック穴11を形成するには難がある。
また、従来の穴打抜き金型を用いた場合、図４に示したようなワークＷの長手方向中央部ＷＭに高精度な打抜き穴を形成することが難しいという課題があった。この従来の穴打抜き金型の課題を以下に説明する。 However, in the press die of Patent Document 2, when a punched portion is formed at a portion away from one end with respect to the workpiece W, a large bending moment acts on the slide die 8 via a pin that forms the punched portion. . Therefore, it is difficult to form the key lock hole 11 in the longitudinal central portion WM of the workpiece W as shown in FIG.
Further, when a conventional punching die is used, there is a problem that it is difficult to form a punching hole with high accuracy in the longitudinal center WM of the workpiece W as shown in FIG. The problem of this conventional hole punching die will be described below.

従来の穴打抜き金型は、図７（ａ）、（ｂ）、（ｃ）に示したように、打抜き穴を形成する逃げ貫通部４を有する一体のロッド状のダイ金型１（ダイスともいう）と、逃げ貫通部４に対応してワークＷの外部に配置される打抜き方向へ移動可能なパンチ２と、ワークＷの外周面と接触してワークＷを支持するワーク支持金型３とからなる。前記したダイ金型１は、ワーク長手方向への移動が規制されており、ワーク支持金型３の上方に固定保持されている。   As shown in FIGS. 7A, 7B, and 7C, the conventional hole punching die is an integral rod-shaped die die 1 (also referred to as a die) having an escape through portion 4 that forms a punching hole. A punch 2 that is disposed outside the workpiece W in correspondence with the escape through-hole 4 and that can move in the punching direction, and a workpiece support die 3 that contacts the outer peripheral surface of the workpiece W and supports the workpiece W. Consists of. The die mold 1 described above is restricted from moving in the workpiece longitudinal direction, and is fixedly held above the workpiece support mold 3.

そして、打抜き穴の形成時、固定保持されているダイ金型１に向かってワークＷが、一端部ＷＬ側から挿入され、ストッパ23に当接し、長手方向中央部の打抜き穴形成箇所が逃げ貫通部４と合致するように位置決めされる（図７（ａ）、（ｂ）参照）。このワークＷの長手方向中央部の内径は一端部ＷＬの内径よりも大きいために、一体のダイ金型外面とワーク内面間のギャップｇが、許容すき間を超える（図７（ｂ）、（ｃ）参照）。このギャップｇは、穴許容すき間に、ワークＷの長手方向中央部の内径と一端部ＷＬの内径との差の半分を加えた値である。   When the punching hole is formed, the workpiece W is inserted from the one end WL side toward the die mold 1 that is fixed and held, contacts the stopper 23, and the punching hole forming portion in the central portion in the longitudinal direction escapes and penetrates. It is positioned so as to coincide with the part 4 (see FIGS. 7A and 7B). Since the inner diameter of the central portion in the longitudinal direction of the workpiece W is larger than the inner diameter of the one end WL, the gap g between the outer surface of the integrated die mold and the inner surface of the workpiece exceeds the allowable clearance (FIGS. 7B and 7C). )reference). This gap g is a value obtained by adding a half of the difference between the inner diameter of the center portion in the longitudinal direction of the workpiece W and the inner diameter of the one end portion WL to the hole permissible clearance.

したがって、従来の穴打抜き金型では、一端が開口された中空形状のワークＷに打抜き穴を形成する際、打抜き穴周辺部に大きな「だれ」変形が生じてしまい、高精度な打抜き穴を形成することが難しくなるという課題があった。
本発明は、上記従来技術の問題点を解消し、一端が開口された中空形状のワークＷに打抜き穴を形成する際、打抜き穴周辺部に生じ易い「だれ」変形を小さくすることができ、高精度な打抜き穴を形成することができる穴打抜き金型を提供することを目的とする。 Therefore, in the conventional hole punching die, when the punching hole is formed in the hollow workpiece W having one end opened, a large “sag” deformation occurs in the periphery of the punching hole, and a highly accurate punching hole is formed. There was a problem that it was difficult to do.
The present invention solves the above-mentioned problems of the prior art, and when forming a punched hole in a hollow workpiece W having one end opened, it is possible to reduce the "sag" deformation that is likely to occur around the punched hole, An object of the present invention is to provide a hole punching die capable of forming a highly accurate punching hole.

本発明者等は、穴打抜き金型について鋭意検討した結果、一体のダイ金型に代え、２分割構造のダイ金型とすれば上記課題を解決できることを見出し、この知見に基づいて本発明をなすに至った。
すなわち本発明は、以下のとおりである。
１．打抜き穴を形成する逃げ貫通部を有しワークの内部に配設される２分割構造のダイ金型と、前記逃げ貫通部に対応してワークの外部に配置される打抜き方向へ移動可能なパンチと、前記ワークをその外周面から支持するワーク支持金型とを備え、前記ワークに打抜き穴を形成するための穴打抜き金型であって、
前記ダイ金型は、一方が打抜き穴を形成する逃げ貫通部を有しワーク長手方向への移動が規制される固定ダイ金型、他方がワーク長手方向の待機位置から所定位置までの間をスライド可能なスライドダイ金型とされ、それぞれの先端部側のワーク中心寄りに、ワーク長手方向に対して同じ角度に傾けられたスライド可能な傾斜平面を有し、該傾斜平面を介して互いに接触可能なように打抜き方向に並べて配設されてなり、前記スライドダイ金型を前記所定位置にまでスライド移動させた状態で前記逃げ貫通部の周辺部および前記逃げ貫通部と反対側の一部が、前記打抜き穴を形成するワークの内面と密着するように形成されていることを特徴とする穴打抜き金型。
２．前記スライドダイ金型の支持部側に、ダイ金型間の間隔が広くなることを防止する付勢手段が具備されていることを特徴とする上記１．に記載の穴打抜き金型。
３．前記ダイ金型の先端側に、ワーク長手方向に直角な断面が凸形状とされた凸部と、該凸部が嵌まり込むように凹形状とされた凹部とからなるガイド手段が具備されていることを特徴とする上記１．または２．に記載の穴打抜き金型。 As a result of intensive studies on the hole punching die, the present inventors have found that the above-mentioned problem can be solved by using a die die having a two-part structure instead of an integral die die, and the present invention is based on this finding. It came to an eggplant.
That is, the present invention is as follows.
1. A die mold having a two-part structure having an escape through portion for forming a punch hole and disposed inside the workpiece, and a punch movable in the punching direction arranged outside the workpiece corresponding to the escape through portion And a workpiece supporting mold for supporting the workpiece from its outer peripheral surface, a hole punching die for forming a punching hole in the workpiece,
One of the die dies has an escape through portion that forms a punching hole, and a fixed die die whose movement in the longitudinal direction of the workpiece is restricted, and the other slides between a standby position in the longitudinal direction of the workpiece and a predetermined position. It is a slidable die mold that has a slidable inclined plane that is inclined at the same angle with respect to the workpiece longitudinal direction near the center of the workpiece on the tip side, and can contact each other via the inclined plane. In such a state that the slide die mold is slid to the predetermined position, the peripheral portion of the escape through portion and a part on the opposite side of the escape through portion are arranged in the punching direction as described above. A hole punching die, wherein the punching die is formed so as to be in close contact with an inner surface of a workpiece forming the punching hole.
2. 1. The urging means for preventing the space between the die dies from being widened is provided on the support side of the slide die dies. The hole punching die described in 1.
3. Guide means comprising a convex portion whose cross section perpendicular to the longitudinal direction of the workpiece is convex and a concave portion that is concave so that the convex portion is fitted is provided on the tip side of the die mold. The above-described 1. Or 2. The hole punching die described in 1.

本発明によれば、一端が開口された中空形状のワークＷに打抜き穴を形成する際、打抜き穴周辺部に生じ易い「だれ」変形を小さくすることができ、高精度な打抜き穴を形成することができる。したがって、打抜き穴周辺のバリ除去加工を不要とすることができ、コストと製造効率の点で有利である。また、本発明によれば、一端が開口された中空形状のワーク長手方向の一端部、長手方向中央部、それよりも奥の他端部にも高精度に打抜き穴を形成することができ、本発明の穴打抜き金型は特にアウターシャフトに用いて好適である。   According to the present invention, when a punched hole is formed in a hollow workpiece W having one end opened, it is possible to reduce the “sag” deformation that is likely to occur around the punched hole, thereby forming a highly accurate punched hole. be able to. Therefore, the burr removal process around the punched hole can be eliminated, which is advantageous in terms of cost and manufacturing efficiency. Further, according to the present invention, it is possible to form a punched hole with high accuracy in one end portion in the longitudinal direction of the hollow workpiece whose one end is opened, in the longitudinal center portion, and in the other end portion in the back. The hole punching die of the present invention is particularly suitable for use in an outer shaft.

以下、本発明例の穴打抜き金型について説明する。
図１（ａ）、（ｂ）、（ｃ）は、本発明例の穴打抜き金型の構成およびその使用手順を示す一部断面側面図であり、図２は、図１（ｃ）のＸ−Ｘ断面図である。また図３は、２分割構造のダイ金型１Ａ、１Ｂの作用を説明する側面図である。
本発明例の穴打抜き金型は、図１（ａ）〜（ｃ）に示したように、打抜き穴を形成する逃げ貫通部４を有しワークの内部に配設される２分割構造のダイ金型１Ａ、１Ｂと、逃げ貫通部４に対応してワークＷの外部に配設される打抜き方向に可動なパンチ２と、ワークＷをその外周面から支持するワーク支持金型３とを備え、ワークＷの長手方向中央部に打抜き穴を形成するようにしている。 Hereinafter, the hole punching die of the present invention example will be described.
1 (a), (b), and (c) are partially sectional side views showing the configuration of a punching die according to the present invention and the procedure for using it, and FIG. 2 is a cross-sectional side view of FIG. -X sectional drawing. FIG. 3 is a side view for explaining the operation of the die molds 1A and 1B having a two-part structure.
As shown in FIGS. 1 (a) to 1 (c), the hole punching die of the present invention has a two-part structure die having a relief through portion 4 for forming a punching hole and disposed inside the workpiece. There are provided dies 1A and 1B, a punch 2 which is disposed outside the workpiece W in correspondence with the escape through portion 4 and movable in the punching direction, and a workpiece supporting die 3 which supports the workpiece W from its outer peripheral surface. A punching hole is formed in the center in the longitudinal direction of the workpiece W.

ワークＷは、図１（ａ）、（ｂ）中の矢印で示したように、右方向から供給され、ストッパ23に当接することで、打抜き穴を形成する箇所が逃げ貫通部４と合致するように位置決めされる。パンチ２およびワーク支持金型３は従来例の穴打抜き金型と同様な構成である。
２分割構造のダイ金型１Ａ、１Ｂの先端部側は、図１（ｃ）に示したように、打抜き穴の形成時、ワークＷの長手方向中央部内に配設され、先端部側よりも細く形成された支持部側はワークＷの一端部ＷＬ内からワーク外にわたり配設される。図１、図２中、逃げ貫通部４を有し上側（打抜き穴に近い側）に配設される方が、固定ダイ金型１Ａであり、逃げ貫通部４を設けず固定ダイ金型１Ａの下側に配設される方がスライドダイ金型１Ｂである。すなわち、逃げ貫通部４を有する固定ダイ金型１Ａは、ワーク長手方向への移動が規制され、支持部側よりも太く形成された先端部側の逃げ貫通部４が、パンチ２に対応してワーク支持金型３の上方に来るように固定保持されている。一方、固定ダイ金型１Ａの下側に配設されるスライドダイ金型１Ｂは、支持部側よりも太く形成された先端部側が、ワーク長手方向の待機位置からワーク長手方向の所定位置にまでスライド移動可能となっている。このスライドダイ金型１Ｂの支持部側には、ダイ金型間の間隔が広くなるのを防止するための付勢手段22が具備されている。なお、打抜き方向に平行な方向を上下方向、打抜き方向に直角な２軸方向をそれぞれ、長手方向および幅方向とする。 As shown by the arrows in FIGS. 1A and 1B, the workpiece W is supplied from the right direction and abuts against the stopper 23, so that the portion where the punched hole is formed coincides with the escape through portion 4. Are positioned as follows. The punch 2 and the work support die 3 have the same configuration as the conventional hole punching die.
As shown in FIG. 1 (c), the tip end side of the die molds 1A and 1B having a two-part structure is disposed in the center in the longitudinal direction of the workpiece W when the punching hole is formed. The thin support portion side is disposed from one end WL of the work W to the outside of the work. In FIG. 1 and FIG. 2, the fixed die mold 1 </ b> A having the escape through portion 4 and disposed on the upper side (side closer to the punching hole) is the fixed die die 1 </ b> A without providing the escape through portion 4. The one disposed on the lower side is the slide die mold 1B. That is, the fixed die mold 1A having the escape through portion 4 is restricted from moving in the longitudinal direction of the workpiece, and the escape through portion 4 on the tip side formed thicker than the support side corresponds to the punch 2. It is fixedly held so as to be above the workpiece support mold 3. On the other hand, in the slide die mold 1B disposed below the fixed die mold 1A, the tip end portion formed thicker than the support portion side extends from a standby position in the workpiece longitudinal direction to a predetermined position in the workpiece longitudinal direction. Slide movement is possible. On the support portion side of the slide die mold 1B, an urging means 22 is provided for preventing the interval between the die dies from becoming wide. The direction parallel to the punching direction is the vertical direction, and the biaxial directions perpendicular to the punching direction are the longitudinal direction and the width direction, respectively.

スライドダイ金型１Ｂの待機位置とは、図１（ａ）、（ｂ）に示したように、スライドダイ金型１Ｂの先端が固定ダイ金型１Ａの段差部５Ａよりも少し後方に位置しているときであり、スライドダイ金型１Ｂの所定位置とは、図１（ｃ）に示したように、スライドダイ金型１Ｂの先端が固定ダイ金型１Ａの先端近くに位置しているときである。
また、２分割構造のダイ金型１Ａ、１Ｂは、それぞれの先端部側のワーク中心寄りに、ワーク長手方向に対して同じ角度に傾けられたスライド可能な傾斜平面５、６を有する（図１、図２参照）。 As shown in FIGS. 1A and 1B, the standby position of the slide die mold 1B is such that the tip of the slide die mold 1B is located slightly behind the step portion 5A of the fixed die mold 1A. The predetermined position of the slide die mold 1B is when the tip of the slide die mold 1B is located near the tip of the fixed die mold 1A as shown in FIG. 1 (c). It is.
Moreover, the die molds 1A and 1B having a two-part structure have slidable inclined planes 5 and 6 that are inclined at the same angle with respect to the workpiece longitudinal direction near the workpiece center on the tip side (FIG. 1). FIG. 2).

すなわち、本発明例の２分割構造のダイ金型は、一方が逃げ貫通部４を有しワーク長手方向への移動が規制される固定ダイ金型１Ａ、他方がワーク長手方向の待機位置から所定位置までの間をスライド可能なスライドダイ金型１Ｂとされ、それぞれの先端部側のワーク中心寄りに、ワーク長手方向に対して同じ角度に傾けられたスライド可能な傾斜平面５、６を有し、傾斜平面５、６を介して互いに接触可能に打抜き方向に並べて配設されてなることが特徴である。   That is, in the die mold of the two-part structure of the present invention example, one is a fixed die mold 1A that has the escape through portion 4 and is restricted from moving in the work longitudinal direction, and the other is predetermined from the standby position in the work longitudinal direction. The slide die mold 1B is slidable up to a position, and has slidable inclined planes 5 and 6 that are inclined at the same angle with respect to the workpiece longitudinal direction near the workpiece center on the tip side. It is characterized by being arranged in the punching direction so as to be in contact with each other via the inclined planes 5 and 6.

次いで、本発明例の２分割構造のダイ金型１Ａ、１Ｂの作用について、図３を用い、説明する。図３中の(イ)で示したスライドダイ金型１Ｂの位置が、待機位置に相当し、図３中の（ハ）で示したスライドダイ金型１Ｂの位置が、所定位置の近くに相当する。スライドダイ金型１Ｂは、図３中の（ロ）で示したように、固定ダイ金型１Ａとスライド可能な傾斜平面５、６で接触させつつ、前進移動（図３で右方向への移動を前進移動という）させることにより、固定ダイ金型１Ａの上端からスライドダイ金型１Ｂの下端までの距離（ダイ金型高さという）を可変にできる。このダイ金型高さの可変量は、傾斜平面５、６のワーク長手方向距離と傾き角度θに応じて決まる。   Next, the operation of the die molds 1A and 1B having a two-part structure of the present invention will be described with reference to FIG. The position of the slide die mold 1B indicated by (A) in FIG. 3 corresponds to the standby position, and the position of the slide die mold 1B indicated by (C) in FIG. 3 corresponds to the vicinity of the predetermined position. To do. The slide die mold 1B moves forward (moves in the right direction in FIG. 3) while contacting the fixed die mold 1A with the slidable inclined planes 5 and 6, as shown in FIG. (Referred to as forward movement), the distance from the upper end of the fixed die mold 1A to the lower end of the slide die mold 1B (referred to as the die mold height) can be made variable. The variable amount of the die mold height is determined according to the workpiece longitudinal direction distance and the inclination angle θ of the inclined planes 5 and 6.

本発明はこの原理を利用している。すなわち、スライドダイ金型１Ｂを所定位置にスライド移動させた状態では、上下方向のダイ金型高さが高くなるため、逃げ貫通部４の周辺部および逃げ貫通部４と反対側の一部が、打抜き穴を形成するワークＷの内面と密着する（図１（ｃ）、図２参照）ようにダイ金型１Ａ、１Ｂを形成できる。
つまり、図２に示したように、固定ダイ金型１Ａの外周面上の点ＰＱの範囲およびスライドダイ金型１Ｂの外周面上の点ＲＳの範囲が、打抜き穴を形成するワークＷの長手方向中央部の内面と合致する形状とされている。 The present invention utilizes this principle. That is, in the state where the slide die mold 1B is slid to a predetermined position, the die mold height in the vertical direction increases, so that the peripheral part of the escape through part 4 and a part on the opposite side to the escape through part 4 are formed. The die molds 1A and 1B can be formed so as to be in close contact with the inner surface of the workpiece W that forms the punching hole (see FIGS. 1C and 2).
That is, as shown in FIG. 2, the range of the point PQ on the outer peripheral surface of the fixed die mold 1A and the range of the point RS on the outer peripheral surface of the slide die mold 1B are the length of the workpiece W forming the punching hole. The shape matches the inner surface of the central portion in the direction.

一方スライドダイ金型１Ｂを待機位置にスライド移動させた状態では、上下方向のダイ金型高さが低くなるため、ワークＷの長手方向中央部に比べて内径が小さい一端部ＷＬの内周面と、ダイ金型の外周面とが非接触状態となる（図１（ａ）参照）。
また、図２に示したように、固定ダイ金型１Ａの外周面には、点Ｐ、点Ｑよりも下側寄りに逃がしが形成され、同様にスライドダイ金型１Ｂの外周面にも、点Ｒ、点Ｓよりも上側寄りに逃がしが形成されている。この逃がしによって、スライドダイ金型１Ｂを待機位置にスライド移動させた状態で、ワーク長手方向に直角なダイ金型の幅方向に対し、ワークＷの一端部ＷＬの内周面と、ダイ金型の外周面とが非接触状態となる。 On the other hand, in the state in which the slide die 1B is slid to the standby position, the die die height in the vertical direction is lowered, so that the inner peripheral surface of the one end WL having a smaller inner diameter than the longitudinal central portion of the workpiece W. And the outer peripheral surface of the die mold is in a non-contact state (see FIG. 1A).
In addition, as shown in FIG. 2, relief is formed on the outer peripheral surface of the fixed die mold 1 </ b> A below the points P and Q, and similarly, on the outer peripheral surface of the slide die mold 1 </ b> B, Relief is formed on the upper side of points R and S. With the relief, the slide die 1B is slid to the standby position, and the inner peripheral surface of the one end WL of the workpiece W with respect to the width direction of the die die perpendicular to the workpiece longitudinal direction, and the die die Is in a non-contact state.

以上説明した本発明例の２分割構造のダイ金型によれば、スライドダイ金型１Ｂを所定位置にまでスライド移動させた状態で、固定ダイ金型１Ａの逃げ貫通部４の周辺部および逃げ貫通部４と反対側のスライドダイ金型１Ｂの一部が、打抜き穴を形成するワークＷの内面と密着する。したがって、打抜き穴の形成時、パンチ２から加わる打抜き力を、傾斜平面５、６を介して互いに接触しているダイ金型１Ａ、１Ｂを経てワーク支持金型３に伝えることができる（図1（ｃ）、図２参照）。このため、中空形状のワークＷの打抜き穴周辺部に生じ易い「だれ」変形を小さくすることができ、高精度な打抜き穴を形成することができる。   According to the die mold having the two-divided structure according to the present invention described above, the peripheral portion of the escape through-hole 4 of the fixed die mold 1A and the relief in the state where the slide die mold 1B is slid to the predetermined position. A part of the slide die mold 1B opposite to the penetrating part 4 is in close contact with the inner surface of the workpiece W forming the punching hole. Therefore, the punching force applied from the punch 2 when the punching hole is formed can be transmitted to the work support die 3 through the die dies 1A and 1B in contact with each other via the inclined planes 5 and 6 (FIG. 1). (C), see FIG. 2). For this reason, it is possible to reduce the “sag” deformation that easily occurs in the peripheral portion of the punched hole of the hollow workpiece W, and it is possible to form a highly accurate punched hole.

一方、従来例の穴打抜き金型の場合には、一体のダイ金型外面とワーク内面とを密着状態とすることができず、ダイ金型外面とワーク内面間のギャップｇが許容すき間を超えてしまうことが起こる（図７（ｂ）、（ｃ）参照）。このため、従来例の穴打抜き金型では、パンチ２から加わる打抜き力によって、打抜き穴周辺部に大きな「だれ」変形が生じてしまい、高精度な打抜き穴を形成することが難しい。   On the other hand, in the case of the conventional punching die, the outer surface of the die die and the inner surface of the workpiece cannot be brought into close contact with each other, and the gap g between the outer surface of the die die and the inner surface of the workpiece exceeds the allowable clearance. (See FIGS. 7B and 7C). For this reason, in the conventional hole punching die, the punching force applied from the punch 2 causes a large “sag” deformation in the periphery of the punching hole, and it is difficult to form a highly accurate punching hole.

ところで、図１中、22は、スライドダイ金型１Ｂの支持部側に具備した、ダイ金型間の間隔が広くなるのを防止するための付勢手段22である。スライドダイ金型１Ｂの支持部側にダイ金型間の間隔が広くなるのを防止するための付勢手段22を具備することが好ましい。この理由はスライドダイ金型１Ｂに付勢手段22を具備していない場合、スライドダイ金型１Ｂを所定位置から待機位置に戻したときに、スライドダイ金型１Ｂの自重によって、ダイ金型１Ａ、１Ｂ間の上下方向の間隔が広くなり、ワークＷを供給する際、ワークＷの一端部ＷＬの内周面と、ダイ金型１Ａ、１Ｂの外周面とが接触してしまうことが起こり得るからである。付勢手段22としては、ばねやエアーシリンダなどが好適である。   In FIG. 1, reference numeral 22 denotes a biasing means 22 provided on the support portion side of the slide die mold 1B for preventing the interval between the die molds from becoming wide. It is preferable to provide a biasing means 22 for preventing the space between the die dies from becoming wide on the support portion side of the slide die dies 1B. This is because, when the slide die mold 1B is not provided with the urging means 22, when the slide die mold 1B is returned from the predetermined position to the standby position, the die mold 1A is caused by its own weight. When the workpiece W is supplied, the vertical interval between 1B increases and the inner peripheral surface of one end WL of the workpiece W may come into contact with the outer peripheral surface of the die molds 1A and 1B. Because. As the biasing means 22, a spring, an air cylinder or the like is suitable.

なお、ダイ金型間の間隔が広くなるのを防止する付勢手段22は固定ダイ金型１Ａの支持部側に具備することもできる。
また、ダイ金型１Ａ、１Ｂの先端部側に、ワーク長手方向に直角な断面が凸形状とされた凸部20と該凸部20が嵌まり込む凹形状の凹部21とからなるガイド手段が具備されているのが好ましい（図２参照）。この理由は、スライドダイ金型１Ｂをスライド移動させる際、ダイ金型１Ａ、１Ｂ同士を傾斜平面５、６で接触させつつ前進移動させ、あるいは後退移動させることを確実にすることができるからである。 The urging means 22 for preventing the interval between the die dies from becoming wide can be provided on the support portion side of the fixed die dies 1A.
Further, guide means comprising a convex portion 20 having a convex section in a cross section perpendicular to the workpiece longitudinal direction and a concave portion 21 having a concave shape into which the convex portion 20 fits is provided on the tip end side of the die molds 1A and 1B. It is preferably provided (see FIG. 2). This is because when the slide die mold 1B is slid and moved, the die molds 1A and 1B can be reliably moved forward or backward while being in contact with the inclined planes 5 and 6. is there.

特に固定ダイ金型１Ａの傾斜平面５の後端に段差部５Ａを設けた場合、スライドダイ金型１Ｂを待機位置から所定位置にまで前進移動させるには、この段差部５Ａを乗り越えてスライド移動させる必要があるから、このガイド手段が有効に作用する。この固定ダイ金型１Ａの段差部５Ａは、上下方向のダイ金型高さの可変量（傾斜平面５、６のワーク長手方向距離と傾き角度θに応じて決まる。図３参照）が不十分であるとき、それを補うためのものである。   In particular, when a step portion 5A is provided at the rear end of the inclined flat surface 5 of the fixed die mold 1A, the slide die mold 1B is moved over the step portion 5A and slid to move the slide die die 1B forward from the standby position to a predetermined position. This guide means works effectively. The step portion 5A of the fixed die mold 1A has a variable amount of the die mold height in the vertical direction (determined according to the work longitudinal direction distance and the tilt angle θ of the inclined planes 5 and 6; see FIG. 3). Is to make up for it.

以上の説明では、一端が開口された中空形状のワークＷの長手方向中央部に高精度な打抜き穴を１つ形成する場合を示した（図１、図２参照）。
この打抜き穴を形成するワークＷが、図４に示したようなアウターシャフト10のように、円筒形状である場合、ダイ金型の外周面上の点ＰＱおよび点ＲＳの範囲は、ワーク長手方向中央部における内径寸法と同じ内径寸法をもつ円弧形状に形成される。ただし、本発明の穴打抜き金型で打抜き穴を形成する対象は、図４に示したようなアウターシャフト10のように、円筒形状のワークＷに限定されない。 In the above description, the case where one highly accurate punching hole is formed in the center part in the longitudinal direction of the hollow workpiece W having one end opened (see FIGS. 1 and 2).
When the workpiece W forming the punched hole is cylindrical like the outer shaft 10 as shown in FIG. 4, the range of the point PQ and the point RS on the outer peripheral surface of the die mold is the workpiece longitudinal direction. It is formed in an arc shape having the same inner diameter dimension as the inner diameter dimension in the central portion. However, the object for forming the punching hole with the hole punching die of the present invention is not limited to the cylindrical workpiece W like the outer shaft 10 as shown in FIG.

また、図５（ａ）、（ｂ）に示したような形状のワークＷにも高精度な打抜き穴24を形成できる。図７（ａ）は、一端部ＷＬの内径と長手方向中央部ＷＭの内径とが同じ場合であり、図５（ｂ）は、図５（ａ）と同じ形状のワークＷに対して、打抜き穴24を形成する位置を、長手方向中央部ＷＭに代えて一端部ＷＬとした場合である。打抜き穴24の数は、複数個とすることも可能である。   Further, a highly accurate punching hole 24 can be formed in the workpiece W having a shape as shown in FIGS. FIG. 7A shows a case where the inner diameter of the one end WL is the same as the inner diameter of the central portion WM in the longitudinal direction, and FIG. 5B shows the punching of a workpiece W having the same shape as FIG. This is a case where the position where the hole 24 is formed is the one end WL instead of the longitudinal center WM. The number of punched holes 24 may be plural.

本発明例の穴打抜き金型を用い、図４に示したようなアウターシャフト10（ワークＷ）の長手方向中央部ＷＭにキーロック穴11を形成した。このワークＷは厚みが３ｍｍの構造用炭素鋼管を用い、長手方向中央部ＷＭには縮径加工を施さず、その両側部分にプレス押し込み加工あるいはロータリースエージング加工等の縮径加工を施して作成した。なお、キーロック穴11は、ワークＷの一端部ＷＬ内に内径スプラインを形成した後に、竪型プレスに組み込んだ本発明例の穴打抜き金型で一端から１５０ｍｍの位置に形成した。   The key lock hole 11 was formed in the longitudinal center part WM of the outer shaft 10 (work W) as shown in FIG. This work W is made by using a structural carbon steel pipe with a thickness of 3 mm. The central part WM in the longitudinal direction is not subjected to diameter reduction processing, and both sides are subjected to diameter reduction processing such as press indentation processing or rotary swaging processing. did. The key lock hole 11 was formed at a position 150 mm from one end by a hole punching die according to the present invention incorporated in a vertical press after forming an inner diameter spline in one end WL of the workpiece W.

ワークＷの内径寸法は次のとおりである。一端部ＷＬの内径＝１９．０ｍｍ、長手方向中央部ＷＭの内径＝２２．０ｍｍ、他端部ＷＲの内径＝５．０ｍｍ。
本発明例の２分割構造のダイ金型１Ａ、１Ｂは以下とした（図１、図２参照）。傾斜平面５、６のワーク長手方向距離＝4５ｍｍ、傾き角度θ＝３°、ダイ金型高さの可変量＝最大で２．３５ｍｍ（≒４５×ｔａｎ３°）。そして、傾斜平面５の段差部５Ａの量（上下方向の段差量）は０．６５ｍｍ以上とした。段差部５Ａの量≧ＷＭの内径−ＷＬの内径−ダイ金型高さの可変量＝０．６５ｍｍ。 The inner diameter of the workpiece W is as follows. The inner diameter of the one end WL = 19.0 mm, the inner diameter of the longitudinal center WM = 22.0 mm, and the inner diameter of the other end WR = 5.0 mm.
The die molds 1A and 1B having a two-part structure according to the present invention were as follows (see FIGS. 1 and 2). Workpiece longitudinal distance of inclined planes 5 and 6 = 45 mm, inclination angle θ = 3 °, variable amount of die mold height = 2.35 mm at maximum (≈45 × tan 3 °). The amount of the step portion 5A on the inclined plane 5 (the step amount in the vertical direction) was set to 0.65 mm or more. The amount of the stepped portion 5A ≧ the inner diameter of WM−the inner diameter of WL−the variable amount of the die mold height = 0.65 mm.

その結果、本発明例の穴打抜き金型を用いた場合、ハンドルロック用キーが取付けされる高精度なキーロック穴11を形成することができた。   As a result, when the hole punching die of the example of the present invention was used, a highly accurate key lock hole 11 to which a handle lock key was attached could be formed.

（ａ）、（ｂ）、（ｃ）は本発明の穴打抜き金型の構成を示す一部断面側面図である。(A), (b), (c) is a partial cross section side view which shows the structure of the punching die of this invention. 図１（ｃ）のＸ−Ｘ断面図である。It is XX sectional drawing of FIG.1 (c). 本発明例の２分割構造のダイ金型の作用を説明する側面図である。It is a side view explaining the effect | action of the die metal mold | die of the 2 division structure of the example of this invention. アウターシャフトの構造を示す一部断面側面図である。It is a partial cross section side view which shows the structure of an outer shaft. 本発明を適用できる部品の形状を示す一部断面側面図である。It is a partial cross section side view which shows the shape of the components which can apply this invention. 特許文献１に記載のプレス金型の要部断面図である。2 is a cross-sectional view of a main part of a press die described in Patent Document 1. FIG. 従来例の穴打抜き金型の問題点を説明する一部断面側面図である。It is a partial cross section side view explaining the problem of the hole punching die of a prior art example. 特許文献２に記載のアウターシャフトの製造工程を示す一部断面側面図である。It is a partial cross section side view which shows the manufacturing process of the outer shaft described in patent document 2.

符号の説明Explanation of symbols

Ｗ ワーク
ＷＬ 一端部
ＷＲ 他端部
ＷＭ 長手方向中央部
ｇ ダイ金型外面とワーク内面間のギャップ
θ 傾き角度
Ｐ、Ｑ、Ｒ、Ｓ 外周面上の点
１ 一体のダイ金型
１Ａ 固定ダイ金型
１Ｂ スライドダイ金型
２ パンチ
３ ワーク支持金型
４ 逃げ貫通部
５、６ 傾斜平面
５Ａ 段差部
７ ピン
８ 移動金型
９ 型形成金型
９ａ 逃げ凹部
10 アウターシャフト
11 キーロック穴
20 凸部
21 凹部
22 付勢手段
23 ストッパ
24 打抜き穴
25 素材
26 第１中間素材
27 第２中間素材
28 第３中間素材
29 内径スプライン部（特許文献１では雌セレーション部）
30 アウターシャフト
30 雄セレーション部
31 雄ねじ部 W Workpiece WL One end portion WR Other end portion WM Longitudinal central portion g Gap between die die outer surface and workpiece inner surface θ Inclination angle P, Q, R, S Point on outer peripheral surface 1 Integral die die 1A Fixed die die Mold 1B Slide die mold 2 Punch 3 Work support mold 4 Escape through part 5, 6 Inclined plane 5A Stepped part 7 Pin 8 Moving mold 9 Mold forming mold 9a Escape recess
10 Outer shaft
11 Key lock hole
20 Convex
21 recess
22 Energizing means
23 Stopper
24 punched holes
25 materials
26 First intermediate material
27 Second intermediate material
28 3rd intermediate material
29 Inner-diameter spline (female serration in Patent Document 1)
30 Outer shaft
30 Male Serration Club
31 Male thread

Claims (3)

打抜き穴を形成する逃げ貫通部を有しワークの内部に配設される２分割構造のダイ金型と、前記逃げ貫通部に対応してワークの外部に配置される打抜き方向へ移動可能なパンチと、前記ワークをその外周面から支持するワーク支持金型とを備え、前記ワークに打抜き穴を形成するための穴打抜き金型であって、
前記ダイ金型は、一方が打抜き穴を形成する逃げ貫通部を有しワーク長手方向への移動が規制される固定ダイ金型、他方がワーク長手方向の待機位置から所定位置までの間をスライド可能なスライドダイ金型とされ、それぞれの先端部側のワーク中心寄りに、ワーク長手方向に対して同じ角度に傾けられたスライド可能な傾斜平面を有し、該傾斜平面を介して互いに接触可能なように打抜き方向に並べて配設されてなり、前記スライドダイ金型を前記所定位置にまでスライド移動させた状態で前記逃げ貫通部の周辺部および前記逃げ貫通部と反対側の一部が、前記打抜き穴を形成するワークの内面と密着するように形成されていることを特徴とする穴打抜き金型。 A die mold having a two-part structure having an escape through portion for forming a punch hole and disposed inside the workpiece, and a punch movable in the punching direction arranged outside the workpiece corresponding to the escape through portion And a workpiece supporting mold for supporting the workpiece from its outer peripheral surface, a hole punching die for forming a punching hole in the workpiece,
One of the die dies has an escape through portion that forms a punching hole, and a fixed die die whose movement in the longitudinal direction of the workpiece is restricted, and the other slides between a standby position in the longitudinal direction of the workpiece and a predetermined position. It is a slidable die mold that has a slidable inclined plane that is inclined at the same angle with respect to the workpiece longitudinal direction near the center of the workpiece on the tip side, and can contact each other via the inclined plane. In such a state that the slide die mold is slid to the predetermined position, the peripheral portion of the escape through portion and a part on the opposite side of the escape through portion are arranged in the punching direction as described above. A hole punching die, wherein the punching die is formed so as to be in close contact with an inner surface of a workpiece forming the punching hole. 前記スライドダイ金型の支持部側に、ダイ金型間の間隔が広くなることを防止する付勢手段が具備されていることを特徴とする請求項１に記載の穴打抜き金型。   2. The punching die according to claim 1, further comprising an urging unit for preventing a space between the die dies from being widened on a support portion side of the slide die dies. 前記ダイ金型の先端部側に、ワーク長手方向に直角な断面が凸形状とされた凸部と、該凸部が嵌まり込むように凹形状とされた凹部とからなるガイド手段が具備されていることを特徴とする請求項１または２に記載の穴打抜き金型。   Guide means comprising a convex portion whose cross section perpendicular to the workpiece longitudinal direction is convex and a concave portion that is concave so that the convex portion fits is provided on the tip end side of the die mold. The hole punching die according to claim 1 or 2, wherein the die is punched.
JP2008269756A 2008-10-20 2008-10-20 Hole punching mold Pending JP2010094725A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102615172A (en) * 2011-01-28 2012-08-01 旭东机械(昆山)有限公司 Punching piercing mechanism
CN109290446A (en) * 2018-09-25 2019-02-01 珠海格力精密模具有限公司 A kind of hole flanging mold structure and process for stamping
CN111054870A (en) * 2019-11-19 2020-04-24 南通永大管业股份有限公司 Ultra-long upsetting device for large-wall-thickness seamless steel pipe and using method thereof
WO2022152964A1 (en) * 2021-01-15 2022-07-21 Leo Larikka Method and apparatus for making a t-branch collar in a pipe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS564928A (en) * 1979-06-27 1981-01-19 Tech Res & Dev Inst Of Japan Def Agency Pulse repetitive frequency discrimination system
JPS56148419A (en) * 1980-04-17 1981-11-17 Nippon Koki Kk Patterning method for extruded cylindrical material made of aluminum
JPH05111724A (en) * 1991-05-28 1993-05-07 Kenji Jitsuhara Device and method for supporting female die at the time of tube hole opening
JPH11244957A (en) * 1998-03-03 1999-09-14 Toyota Auto Body Co Ltd Die blade support structure of punching device
WO2006095754A1 (en) * 2005-03-09 2006-09-14 Eizou Ueno Method and device for making through hole in circumferential wall of work

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS564928A (en) * 1979-06-27 1981-01-19 Tech Res & Dev Inst Of Japan Def Agency Pulse repetitive frequency discrimination system
JPS56148419A (en) * 1980-04-17 1981-11-17 Nippon Koki Kk Patterning method for extruded cylindrical material made of aluminum
JPH05111724A (en) * 1991-05-28 1993-05-07 Kenji Jitsuhara Device and method for supporting female die at the time of tube hole opening
JPH11244957A (en) * 1998-03-03 1999-09-14 Toyota Auto Body Co Ltd Die blade support structure of punching device
WO2006095754A1 (en) * 2005-03-09 2006-09-14 Eizou Ueno Method and device for making through hole in circumferential wall of work

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102615172A (en) * 2011-01-28 2012-08-01 旭东机械(昆山)有限公司 Punching piercing mechanism
CN109290446A (en) * 2018-09-25 2019-02-01 珠海格力精密模具有限公司 A kind of hole flanging mold structure and process for stamping
CN109290446B (en) * 2018-09-25 2024-05-24 珠海格力精密模具有限公司 Hole flanging die structure and stamping method
CN111054870A (en) * 2019-11-19 2020-04-24 南通永大管业股份有限公司 Ultra-long upsetting device for large-wall-thickness seamless steel pipe and using method thereof
CN111054870B (en) * 2019-11-19 2022-04-05 南通永大管业股份有限公司 Ultra-long upsetting device for large-wall-thickness seamless steel pipe and using method thereof
WO2022152964A1 (en) * 2021-01-15 2022-07-21 Leo Larikka Method and apparatus for making a t-branch collar in a pipe

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