JP5732230B2 - Punching method and mold - Google Patents

Punching method and mold Download PDF

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JP5732230B2
JP5732230B2 JP2010245377A JP2010245377A JP5732230B2 JP 5732230 B2 JP5732230 B2 JP 5732230B2 JP 2010245377 A JP2010245377 A JP 2010245377A JP 2010245377 A JP2010245377 A JP 2010245377A JP 5732230 B2 JP5732230 B2 JP 5732230B2
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die
punch
workpiece
punching
cylindrical portion
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JP2012096258A (en
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啓太 野村
啓太 野村
竜太 森
竜太 森
正道 三輪
正道 三輪
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Unipres Corp
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Description

この発明はワークに開口をパンチ及びダイにより打抜きにより加工する方法に関し、打抜き加工時に開口縁に必然的に生ずるバリをそのままに放置しておいても後工程に影響しないようにすることができるものである。   The present invention relates to a method for punching a workpiece by punching with a punch and a die, and it is possible to prevent a subsequent process from being affected even if a burr that is inevitably generated at the opening edge is left as it is during punching. It is.

パンチ及びダイにより打抜きにより加工する方法(ピアス加工)においては、打抜きによるパンチの抜け側であるダイ側開口縁にバリが残される。バリはワーク一般面から突出し、そこが他部品との当たり面になる場合の如く平滑性が必要な場合はバリ取り作業のための工程が必須となり、そのため製造コストがバリ取りの分だけ嵩み、延いては製品コストが嵩むことになる。また、バリ取り作業はそれにより発生する切粉の付着による二次的な不具合があり、この点でもバリ取り作業は可能な限り省きたい要請がある。   In a method of piercing with a punch and a die (piercing), burrs are left on the die-side opening edge that is the punch removal side by punching. The burr protrudes from the general work surface, and if smoothness is required, such as when it comes into contact with other parts, a deburring process is essential, and the manufacturing cost is increased by the amount of deburring. As a result, the product cost increases. In addition, the deburring work has a secondary problem due to the adhesion of chips generated thereby, and there is a demand for eliminating the deburring work as much as possible.

そこでバリ取り工程の省略のため、ピアス加工を2段階で実施し、ピアス加工の前段の第1工程において第1のダイと第1のポンチによってワークのダイ側面に台形断面の環状凹部を形成し、第2段階の加工において第2のダイと第2のポンチによってピアス打抜きを行うが、この際、第2のポンチを、第1段階において形成される凹部の台形断面におけける下底の外縁より小径としている。ピアス打抜きのための第2のポンチが凹部の台形断面におけける下底の外縁より小径であるため、ピアス打抜きにより形成される穿孔部の内縁は台形の傾斜面部位に位置する。穿孔部におけるダイ側内周縁にはバリが形成されるが、バリは傾斜面部位から突出するためその突出先端部位は相対的に引っ込み、ワーク下面から突出することがない。そのため、バリはそのままに放置しても平滑性に影響することがないため、バリ取り作業を省略することができる(特許文献1)。
特開2008−229710号公報
Therefore, in order to omit the deburring process, the piercing process is performed in two stages, and in the first process before the piercing process, an annular recess having a trapezoidal cross section is formed on the die side surface of the workpiece by the first die and the first punch. In the second stage processing, piercing is performed by using the second die and the second punch, and at this time, the second punch is used as the outer edge of the lower base in the trapezoidal section of the recess formed in the first stage. The diameter is smaller. Since the second punch for piercing punching has a smaller diameter than the outer edge of the lower bottom in the trapezoidal cross section of the recess, the inner edge of the perforated portion formed by piercing punching is located at the trapezoidal inclined surface portion. Although burrs are formed on the inner peripheral edge of the die in the perforated portion, the burrs protrude from the inclined surface portion, so that the protruding tip portion is relatively retracted and does not protrude from the work lower surface. Therefore, even if the burr is left as it is, it does not affect the smoothness, so the deburring operation can be omitted (Patent Document 1).
JP 2008-229710 A

従来技術はピアス加工を環状凹部の形成のための第1段階とピアス打抜きのための第2段階との2工程で実施している。そのため、一つの孔の加工のためダイとポンチとからなる金型が2組必要であり、型コストが嵩むことになり、また、事実上ワークを凹部形成とピアス打抜きとで一つの孔の加工のため2箇所に移送させて行う必要があり、製造効率の面でも不利である。   The prior art performs piercing in two steps, a first stage for forming an annular recess and a second stage for piercing. Therefore, two sets of dies composed of a die and a punch are required for processing a single hole, which increases the cost of the mold. In fact, a single hole can be processed by forming a recess and punching a pierce. Therefore, it is necessary to carry out the transfer to two places, which is disadvantageous in terms of manufacturing efficiency.

この発明は以上の問題点に鑑みてなされたものであり、バリ取りを省略しつつ1回の工程で完了させることができるようにすることを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to be able to be completed in one step while omitting deburring.

この発明になる、パンチとダイ間に配置されたワークにパンチのダイに対する相対運動により打抜き加工する方法においては、打抜き加工のためのパンチのダイに対する1サイクルの相対移動開始後、打抜き完了前に、ダイに対向したワーク面に凹形状部を形成し、打抜き完了後のパンチによる打抜き縁は前記凹形状部に位置するようにしたことを特徴とする。   In the method of punching a workpiece disposed between a punch and a die by relative movement of the punch with respect to the die according to the present invention, after the start of relative movement of one cycle with respect to the die of the punch for punching, before the punching is completed. A concave shape portion is formed on the work surface facing the die, and a punching edge by the punch after the punching is completed is located in the concave shape portion.

パンチによる打抜き縁となるべきダイに対向したワークの部位を凹形状に形成するため、ダイはダイ孔の開口端面に環状突起部を備えることができる。そして、ダイの環状突起部はパンチと直接又はパッドを介して協働することでワークを上下に挟着し、前記凹形状部の形成を行う。   The die can be provided with an annular protrusion on the opening end face of the die hole in order to form the workpiece portion facing the die to be a punching edge by punching in a concave shape. Then, the annular projecting portion of the die cooperates with the punch directly or via a pad to sandwich the workpiece vertically, thereby forming the concave portion.

この方法実施のための金型は、穿孔のためのパンチ及びダイに加えて、パンチとダイとの相対移動開始後、打抜き完了前に、前記相対移動に連動してワークを上下に加圧挟着する加圧挟着手段を備え、ダイはダイ孔の開口端面に環状突起部を備え、加圧挟着手段による上下からのワークの挟着時に前記環状突起部によりワーク面に凹形状部を形成し、パンチによる打抜き縁は凹形状部に位置させる。   In addition to the punch and die for punching, the mold for carrying out this method is configured to press and hold the workpiece up and down in conjunction with the relative movement after the start of the relative movement between the punch and the die and before the punching is completed. The die is provided with an annular protrusion on the opening end surface of the die hole, and a concave portion is formed on the work surface by the annular protrusion when the work is sandwiched from above and below by the pressure sandwiching means. The punching edge is formed and positioned in the concave shape portion.

この発明によれば、打抜き完了前にダイに対向したワーク面に凹形状部を形成し、打抜き時のパンチによる打抜き縁を凹形状部に位置させているため、打抜き時にワークのダイ側打抜き開口縁に形成されるバリはワーク一般面より凹まされた部位より突出する。バリがワークの一般面から突出しないように凹部の深さを設定することができるため、バリを放置しておいてもワークのダイ側の平滑性に影響がなく、バリ取り作業を省略することができ、また、ピアス加工の1サイクル中にピアス穿孔に先立って凹部形成を済ませることができ、工程数は1サイクルのままで増やすことがなく、設備コスト及び操業コストを削減することができ、延いては製品コストを下げることができる。   According to the present invention, since the concave portion is formed on the work surface facing the die before the punching is completed, and the punching edge by the punch at the time of punching is located in the concave portion, the die side punching opening of the workpiece at the time of punching The burr formed on the edge protrudes from a portion recessed from the general work surface. Since the depth of the recess can be set so that the burr does not protrude from the general surface of the workpiece, leaving the burr does not affect the smoothness on the die side of the workpiece and omits the deburring operation In addition, the concave portion can be formed prior to piercing drilling during one cycle of piercing, and the number of steps does not increase as one cycle, and the equipment cost and operation cost can be reduced. As a result, the product cost can be reduced.

図1はこの発明の実施形態におけるワークとしての自動車変速機用のクラッチドラムの断面図である。FIG. 1 is a sectional view of a clutch drum for an automobile transmission as a work in an embodiment of the present invention. 図2は図1のクラッチドラムのシール取付孔のピアス加工のための専用機の概略図である。FIG. 2 is a schematic view of a dedicated machine for piercing the seal mounting hole of the clutch drum of FIG. 図3は図2のクラッチドラムのシール取付孔のピアス加工のための専用機におけるダイ及びパンチの部位の拡大図である。FIG. 3 is an enlarged view of a die and punch portion in a dedicated machine for piercing the seal mounting hole of the clutch drum of FIG. 図4は図3におけるダイ及びパンチの模式的部分詳細図であり、この発明におけるピアス加工の1サイクルにおける工程(イ)−(ヘ)を示す。FIG. 4 is a schematic partial detailed view of the die and punch in FIG. 3 and shows steps (a) to (f) in one cycle of piercing in the present invention. 図5は図1の部分拡大図であり、この発明の方法によるピアス加工により得られたクラッチドラム中間筒状部におけるシール部品取り付け孔の詳細形状を示す。FIG. 5 is a partially enlarged view of FIG. 1 and shows a detailed shape of the seal part mounting hole in the intermediate drum portion of the clutch drum obtained by piercing according to the method of the present invention. 図6は図3と同様であるが別実施形態におけるダイ及びパンチの部位の拡大図である。FIG. 6 is an enlarged view of a portion of the die and punch according to another embodiment similar to FIG. 図7は図6におけるダイ及びパンチの部分拡大図であり、この発明におけるピアス加工の1サイクルにおける工程(イ)−(ヘ)を示す。FIG. 7 is a partially enlarged view of the die and punch in FIG. 6 and shows steps (a) to (f) in one cycle of piercing in the present invention.

以下この発明を自動車自動変速機におけるクラッチドラムにおけるシール取付孔のピアス加工において実施した場合を説明する。   Hereinafter, the case where the present invention is implemented in the piercing process of the seal mounting hole in the clutch drum in the automobile automatic transmission will be described.

図1は板材からのプレス成形品であるそれ自体は周知のクラッチドラム10を示しており、変速機軸の挿通のための中央の内周筒状部10-1と、その外周におけるシール部品保持のための中間筒状部10-2と、クラッチ板の保持のための外周筒状部10-3を備えている。中間筒状部10-2と外周筒状部10-3との間は環状の空洞部12を形成し、周知のようにこの空洞部12にクラッチパックやピストン等のクラッチ部品が収容されるようになっている。周知のように外周筒状部10-3はクラッチ部品の収容のためスプラインを形成している。中間筒状部10-2はその内周に環状シール部品を保持し、環状シール部品のための組み付け孔14を備える。中間筒状部10-2に対する環状シール部品のための組み付け孔14の加工はピアス加工の場合、通常は後述のように専用機を使用して行うが、この場合パンチは外周側(図1の空洞部12の側)、ダイを内周側にして加工を行うが、パンチの抜け側である中間筒状部10-2の内周側(ダイ側)における開口縁にバリが発生する。中間筒状部10-2の内周側においてはシール部品が摺動するため、そのままではバリは放置できずバリ取りの必要があったが本発明はピアス加工工程の工夫でバリ取りを不要とするものである。尚、環状シール部品のための組み付け孔14の加工はドリル加工により行うことも可能であるが、この場合は開口縁の両側にバリが形成されるため、環状シール部品の組み付け側である内周面側のバリ取りは同様に必須である。   FIG. 1 shows a clutch drum 10 known per se, which is a press-molded product from a plate material, and has a central inner cylindrical portion 10-1 for insertion of a transmission shaft and a seal part holding member on the outer periphery thereof. An intermediate cylindrical portion 10-2 for holding the outer peripheral cylindrical portion 10-3 for holding the clutch plate. An annular cavity 12 is formed between the intermediate cylindrical part 10-2 and the outer cylindrical part 10-3 so that clutch parts such as a clutch pack and a piston can be accommodated in the cavity 12 as is well known. It has become. As is well known, the outer cylindrical portion 10-3 forms a spline for accommodating clutch parts. The intermediate cylindrical portion 10-2 holds an annular seal part on its inner periphery and includes an assembly hole 14 for the annular seal part. In the case of piercing, the assembly hole 14 for the annular seal part for the intermediate cylindrical portion 10-2 is usually processed by using a dedicated machine as will be described later. Processing is performed with the die on the inner peripheral side), but burrs are generated at the opening edge on the inner peripheral side (die side) of the intermediate cylindrical portion 10-2 that is the punch removal side. Since the seal part slides on the inner peripheral side of the intermediate cylindrical portion 10-2, the burr cannot be left as it is and it was necessary to remove the burr. To do. The assembly hole 14 for the annular seal part can be processed by drilling. In this case, since burrs are formed on both sides of the opening edge, the inner periphery on the assembly side of the annular seal part is formed. Deburring on the side is equally essential.

図2はこの発明のピアス加工装置の実施形態を模式的に示しており、この実施形態はワークとしてのクラッチドラム10のピアス加工のための専用機による場合を説明するが、汎用のプレス機においても金型保持部の構造の工夫によりこの発明のアイディアは実施可能である。クラッチドラム用ピアス加工機は支持台20と昇降体22とを備え、クラッチドラム10の外周筒状部10-3はその外周端面において支持台20に載置支持される。支持台20上にワーク外周係合部材24が直径対立して配置され、クラッチドラム10の外周筒状部10-3を外側より保持する。昇降体22はその下面よりワーク内周保持部26が垂下形成され、ワーク内周保持部26はクラッチドラムの内周筒状部10-1及び中間筒状部10-2に嵌挿位置するべく段形状をなしている。昇降体22からはワーク押え28が垂下され、押えプレート29を介してクラッチドラム10を下方に幾分の弾性下で押圧しており、加工中におけるワークの上下の保持を行う。昇降体22は図示しない油圧機構により矢印F方向に昇降可能であり、他方、支持台20上の外周係合部材24はクラッチドラムの外周筒状部10-3の外面のスプライン溝に選択的に係合するべく半径方向(矢印G)に往復移動可能であるとともに、支持台20上の回転板25が回転することによりワークとしてのクラッチドラム10のインデックスが可能となっている。   FIG. 2 schematically shows an embodiment of the piercing apparatus according to the present invention. In this embodiment, a case of a dedicated machine for piercing the clutch drum 10 as a workpiece will be described. The idea of the present invention can be implemented by devising the structure of the mold holding part. The clutch drum piercing machine includes a support base 20 and an elevating body 22, and the outer peripheral cylindrical portion 10-3 of the clutch drum 10 is placed and supported on the support base 20 at the outer peripheral end face. A workpiece outer periphery engaging member 24 is disposed on the support base 20 so as to oppose the diameter, and holds the outer peripheral cylindrical portion 10-3 of the clutch drum 10 from the outside. The lifting body 22 has a workpiece inner periphery holding portion 26 suspended from its lower surface, and the workpiece inner periphery holding portion 26 is positioned so as to be fitted and inserted into the inner cylindrical portion 10-1 and the intermediate cylindrical portion 10-2 of the clutch drum. It has a step shape. A work presser 28 is suspended from the elevating body 22 and presses the clutch drum 10 downward with some elasticity via a presser plate 29 to hold the work up and down during processing. The elevating body 22 can be raised and lowered in the direction of arrow F by a hydraulic mechanism (not shown), while the outer peripheral engagement member 24 on the support base 20 is selectively formed in a spline groove on the outer surface of the outer peripheral cylindrical portion 10-3 of the clutch drum. The clutch drum 10 can be moved back and forth in the radial direction (arrow G) to be engaged, and the rotary plate 25 on the support base 20 is rotated so that the clutch drum 10 can be indexed as a workpiece.

ピアス加工のためのダイ30はワーク内周保持部26にクラッチドラムの中間筒状部10-2の内周に対向するように設けられ、パンチ32はクラッチドラム10の中間筒状部10-2を挟んで中間筒状部10-2の外周に対向するように配置される。図3はダイ及びパンチの拡大図を示し、ダイ30はダイ孔30Aを備え、ダイ孔30Aの開口端面に環状突起部30-1を形成する。即ち、環状突起部30-1はワークに面したダイ30の端面においてダイ孔30Aの開口縁から半径方向に所定距離の環状領域を占めている。環状突起部30-1はピアス打抜きに先立ってパンチ側と協働してワークを加圧挟着(ダイ30はパンチ32と直接協働することでこの発明の加圧挟着手段を構成)することで、ダイ30の側のクラッチドラム10対向面に適当な深さの凹形状部を形成するためのものである。後述のように環状突起部30-1の高さh(図4(イ)も参照)はダイ30に対向したワーク面に形成される凹形状部の深さd(図4(ニ)が適当な値となるように設定される。図3において、ダイ孔30Aはパンチから離間した部位30A-1においては抜きカスの排出性のためテーパ形状を呈している。パンチ32はこの実施形態においては駆動アーム34に直接取り付け構造となっており、先端32-1がダイ孔30Aと協働することによりワークの穿孔を行うものである。パンチ32を先端に取り付けた駆動アーム34は図2に示すように一旦は下方に延びるが途中でL状に曲折され、支持台20の半径方向の空洞を水平に延びており、図示しない他端に油圧シリンダ(図示せず)のピストンが取り付けられ、油圧シリンダへの油圧の供給方向の制御により駆動アーム34は矢印Bのように水平方向に往復駆動し、これに準じてパンチ32は図3の矢印Hのように往復される。これにより、ダイ30及びパンチ32によるピアス加工を行うことができる。   The die 30 for piercing is provided on the work inner periphery holding portion 26 so as to face the inner periphery of the intermediate cylindrical portion 10-2 of the clutch drum, and the punch 32 is the intermediate cylindrical portion 10-2 of the clutch drum 10. Is disposed so as to face the outer periphery of the intermediate cylindrical portion 10-2. FIG. 3 shows an enlarged view of the die and punch. The die 30 has a die hole 30A, and an annular protrusion 30-1 is formed on the opening end surface of the die hole 30A. That is, the annular protrusion 30-1 occupies an annular region of a predetermined distance in the radial direction from the opening edge of the die hole 30A on the end face of the die 30 facing the workpiece. Prior to piercing punching, the annular protrusion 30-1 cooperates with the punch side to press-clamp the work (the die 30 directly cooperates with the punch 32 to constitute the pressure-clamping means of the present invention). Thus, the concave portion having an appropriate depth is formed on the surface facing the clutch drum 10 on the die 30 side. As will be described later, the height h (see also FIG. 4 (a)) of the annular protrusion 30-1 is appropriately the depth d (FIG. 4 (d)) of the concave portion formed on the work surface facing the die 30. In Fig. 3, the die hole 30A has a tapered shape at the portion 30A-1 spaced from the punch for the removal of the punched residue, and the punch 32 is in this embodiment. The structure is directly attached to the drive arm 34, and the tip 32-1 cooperates with the die hole 30A to punch the workpiece. The drive arm 34 with the punch 32 attached to the tip is shown in FIG. In this way, it extends downward, but is bent in an L shape in the middle, horizontally extends in the radial cavity of the support base 20, and a piston of a hydraulic cylinder (not shown) is attached to the other end (not shown). For controlling the direction of hydraulic pressure supply to the cylinder Accordingly, the drive arm 34 is reciprocated in the horizontal direction as indicated by an arrow B, and the punch 32 is reciprocated as indicated by an arrow H in Fig. 3. Thereby, piercing by the die 30 and the punch 32 is performed. Can do.

次に、この発明の実施形態としてのクラッチドラムの環状シール部品のための組み付け孔のピアス加工方法を説明すると、図4はダイ及びパンチによる1回の加工サイクル(パンチ32を取り付けたアーム34を駆動する油圧シリンダの1回の往復運動)におけるピアス打抜き加工動作を段階(イ)−(ヘ)を追って相当に模式化してかつ一部誇張して図示するものである。即ち、ダイ孔30Aの内径に対するパンチ32の外径差は実際の外径差より相当誇張して描かれている。また、加工の進行の過程でのワーク変形形状はあくまで模式的に表したものである。加工サイクルの開始時は(イ)に示し、ダイ30及びパンチ32はワークとしてのクラッチドラム10を介して離間して位置している。ダイ30はワークに対向した端面に高さhの環状突起部30-1を備える。パンチ32はワーク10に向け前進を開始し(ロ)に至るとパンチ32の先端32-1がワーク10に当接し、、次に(ハ)に示すようにワークはダイ30の環状突起部30-1にも押し付けられ、ワークはダイ30及びパンチ32間に挟着される。パンチ32の更なる前進により、(ニ)に示すようにパンチ32側ではパンチ先端32-1がワークに食い込み始め、同時にダイ30側では環状突起部30-1 がワークに食い込み、その結果、塑性変形により環状突起部30-1との当接部においてワーク10に凹部10Aが形成される。凹部10Aは環状突起部30-1の断面形状に準じて環状をなすが塑性塑性変形によりややダレた断面形状をなす。凹部10Aの深さdは環状突起部30-1の高さhに応じた値となる。パンチ32の前進は(ホ)のように更に継続し、ワークに対するパンチ先端32-1の食い込みは深くなってゆき、他方、ダイ側ではワークにおける凹部10Aの内側の肉がダイ孔30Aに次第に抜けて行く。最終段階(ヘ)においてはパンチ先端32-1がワークを突き抜け(抜きカスをWにて表す)、ピアス打抜きが完了し、ワーク10に環状シール部品のための組み付け孔14が打抜かれ、打抜により形成される孔14の縁部14´は凹部10Aに位置している。   Next, a method for piercing an assembly hole for an annular seal part of a clutch drum as an embodiment of the present invention will be described. FIG. 4 shows a single machining cycle by a die and a punch (an arm 34 to which a punch 32 is attached). The piercing punching operation in one reciprocating motion of the hydraulic cylinder to be driven) is schematically illustrated and partially exaggerated in stages (A) to (F). That is, the difference in the outer diameter of the punch 32 with respect to the inner diameter of the die hole 30A is drawn considerably exaggerated from the actual outer diameter difference. Further, the workpiece deformation shape in the process of processing is merely schematically shown. At the start of the machining cycle, shown in (a), the die 30 and the punch 32 are located apart via the clutch drum 10 as a workpiece. The die 30 includes an annular protrusion 30-1 having a height h on the end face facing the workpiece. When the punch 32 starts to advance toward the workpiece 10 (b), the tip 32-1 of the punch 32 comes into contact with the workpiece 10, and then the workpiece 32 is an annular protrusion 30 of the die 30 as shown in (c). -1 is also pressed, and the work is clamped between the die 30 and the punch 32. Further advancement of the punch 32 causes the punch tip 32-1 to start to bite into the workpiece on the punch 32 side as shown in (d), and at the same time, the annular protrusion 30-1 bites into the workpiece on the die 30 side. Due to the deformation, a recess 10A is formed in the workpiece 10 at the contact portion with the annular protrusion 30-1. The recess 10A has an annular shape according to the cross-sectional shape of the annular protrusion 30-1, but has a slightly sagging cross-sectional shape due to plastic plastic deformation. The depth d of the recess 10A is a value corresponding to the height h of the annular protrusion 30-1. The advancement of the punch 32 continues further as shown in (e), and the biting of the punch tip 32-1 into the workpiece becomes deeper. On the other hand, on the die side, the meat inside the recess 10A in the workpiece gradually falls into the die hole 30A. Go. In the final stage (f), the punch tip 32-1 penetrates the workpiece (the punching residue is indicated by W), the piercing punching is completed, and the assembly hole 14 for the annular seal part is punched in the workpiece 10 and punched. The edge 14 'of the hole 14 formed by the above is located in the recess 10A.

環状シール部品のための組み付け孔14は図1に示すように円周方向にも軸方向にも位置を変えて複数設けられており、軸方向に整列し円周方向において異なった位置の組み付け孔14については、ワーク外周係合部材24を半径外方に後退させ、回転板25を回転させることで、ダイ30及びポンチ32による打抜き箇所にワーク10のインデックスを行うことで加工を行う。また、軸方向に異なった位置の組み付け孔14については隣接ステーションに設置される同様な構成であるがダイ30及びポンチ32の高さが幾分異なる加工機までワークを搬送して加工を行う。   As shown in FIG. 1, a plurality of assembly holes 14 for the annular seal part are provided in different positions in the circumferential direction and in the axial direction, and the assembly holes 14 are aligned in the axial direction and located at different positions in the circumferential direction. 14, the workpiece outer periphery engaging member 24 is retracted radially outward and the rotating plate 25 is rotated, whereby the workpiece 10 is indexed at the punched portion by the die 30 and the punch 32. Further, the assembly holes 14 at different positions in the axial direction have the same configuration installed in adjacent stations, but the work is conveyed to a processing machine with somewhat different dies 30 and punches 32 for processing.

図5はピアス加工完了後におけるクラッチドラム10(ワーク)の中間筒状部10-2にピアス打抜きされた環状シール部品用組み付け孔14を幾分模式的に拡大して示しており、パンチ32の導入側(図1の空洞12の側)である中間筒状部10-2の外周における打ち抜き開口縁はピアス加工に伴うダレ14-1が環状に形成される。パンチ30の抜け側における開口縁にはバリ50が形成される。しかしながら、バリ50の存在は環状シール部品が取り付けられるクラッチドラム10の中間筒状部10-2の内側一般面10Bの平滑性に影響を及ぼさない。即ち、ダイ30の抜き孔30Aへのパンチ32の先端32-1の抜けによる打抜き完了前に中間筒状部10-2(ワーク)の部位に環状突起部30-1の断面形状に準じた断面形状の凹部10Aが形成されている。環状突起部30-1は図3に示すようにパンチ孔30A-1の開口端面に形成されており、パンチ32による打抜き縁(図4(ヘ)の14´)は凹部10Aに位置し、打抜き縁に形成されるバリ50は凹部10Aの底面若しくは底面に連なる傾斜面から起立している。そして、凹部10Aの深さdはバリ50の高さを超えるように環状突起部30-1の高さh、換言すれば、図4(ニ)に示すワークとしてのクラッチドラム10のダイ側面への環状突起部30-1の食い込み量、を設定することが可能であり、バリ50の先端は環状シール部品が組み付くクラッチドラム10の中間筒状部10-2の一般面10Bより内側に後退位置しており、バリ50は一般面10Bの平滑性に影響しないようにでき、そのため、バリ取りの工程を省くことができる。   FIG. 5 schematically shows a somewhat enlarged view of the assembly hole 14 for the annular seal part punched into the intermediate cylindrical portion 10-2 of the clutch drum 10 (workpiece) after completion of the piercing process. A punching opening edge on the outer periphery of the intermediate cylindrical portion 10-2 which is the introduction side (the side of the cavity 12 in FIG. 1) is formed with a sag 14-1 in an annular shape due to piercing. A burr 50 is formed at the opening edge of the punch 30 on the exit side. However, the presence of the burr 50 does not affect the smoothness of the inner general surface 10B of the intermediate cylindrical portion 10-2 of the clutch drum 10 to which the annular seal component is attached. That is, the cross-section conforming to the cross-sectional shape of the annular protrusion 30-1 at the site of the intermediate cylindrical portion 10-2 (workpiece) before completion of punching by the removal of the tip 32-1 of the punch 32 into the punching hole 30A of the die 30. A concave portion 10A having a shape is formed. As shown in FIG. 3, the annular protrusion 30-1 is formed on the opening end face of the punch hole 30A-1, and the punching edge (14 'in FIG. 4F) by the punch 32 is located in the recess 10A. The burr 50 formed on the edge stands up from the bottom surface of the recess 10A or an inclined surface continuous with the bottom surface. The depth d of the recess 10A exceeds the height h of the burr 50, ie, the height h of the annular protrusion 30-1, in other words, to the die side surface of the clutch drum 10 as the workpiece shown in FIG. The amount of biting of the annular protrusion 30-1 can be set, and the tip of the burr 50 is retracted inward from the general surface 10B of the intermediate cylindrical portion 10-2 of the clutch drum 10 to which the annular seal part is assembled. Therefore, the burr 50 can be prevented from affecting the smoothness of the general surface 10B, and therefore, the deburring process can be omitted.

図6は図3の幾分の変形である第2の実施形態を示しており、専用機のワーク内周保持部26に設けられたダイ30と、ダイ30にワークを挟んで対向するようにアーム34に設けられたパンチ32とによりクラックドラム10のピアス打抜きを行うことは第1の実施形態と同様である。相違点はアーム34の先端部分に環状パッド52がパンチの先端部分を包囲するように設けられ、環状パッド52は弾性部材54を介してアーム34に連結されることである。この実施形態においては、ダイ30がその環状突起部30-1が環状パッド52と協働することでこの発明の加圧挟着手段を構成する。   FIG. 6 shows a second embodiment which is a slight modification of FIG. 3, and the die 30 provided in the work inner periphery holding part 26 of the dedicated machine is opposed to the die 30 with the work sandwiched therebetween. The piercing of the crack drum 10 with the punch 32 provided on the arm 34 is performed in the same manner as in the first embodiment. The difference is that an annular pad 52 is provided at the distal end portion of the arm 34 so as to surround the distal end portion of the punch, and the annular pad 52 is connected to the arm 34 via an elastic member 54. In this embodiment, the die 30 constitutes the pressure clamping means of the present invention by the annular projection 30-1 cooperating with the annular pad 52.

この第2の実施形態の動作をダイ30とパンチ32の先端部32-1及びパッド52を示す図7によって説明すると、加工サイクルの開始時は(イ)に示し、ダイ30に対してパンチ32及びパッド52とはワーク10を介して離間して位置している。パンチ32及びパッドは前進を開始し(ロ)に至るとパンチ32の先端32-1及びパッドがワーク10に当接し、以後はワーク10はダイ30に向けて変位され、(ハ)ではワークはダイ30の環状突起部30-1にも当接し、ワークはダイ30とパンチ32及びパッド間に挟着される。パンチ32の更なる前進により、(ニ)に示すようにパンチ32側ではパンチ先端32-1がワークに食い込み始め、パッド52はワークとの当接を維持し、他方弾性部材54の収縮によってパンチ32の更なる前進は許容され、同時にダイ30側では環状突起部30-1 がワークに食い込み、その結果、環状突起部30-1の対向面においてワークに凹部10Aが形成される。環状突起部30-1によりワーク10のダイ側面に凹部10Aを形成した状態でパンチ32の前進は(ホ)のように更に継続し、ワークに対するパンチ先端32-1の食い込みは深くなって行く。最終段階(ヘ)においてはパンチ先端32-1がワークを突き抜け、ピアス打抜きが完了する。この実施形態においても、ダイ30に対向してワーク10に凹形状部10Aを形成し、パンチ32による打抜時の打抜き縁を凹形状部10Aに位置させているため、打抜き時にワークのダイ側打抜き開口縁に形成されるバリは凹形状部10Aより起立する。そのため、ダイ30の環状突起部30-1の高さを適当に設定することで、ダイ側打抜き開口縁に形成されるバリがワークの一般面から突出しないようにすることができるため、バリがそのままでもワークのダイ側一般面の平滑性に影響がなく、バリ取り作業を省略することができる。そして、この実施形態においてはパッド52を備えていることから、凹部10Aの形成の際にパンチ外周部位でのワークの保持を確実に行うことができる利点がある。   The operation of the second embodiment will be described with reference to FIG. 7 showing the die 30, the tip end portion 32-1 of the punch 32, and the pad 52. And the pad 52 are spaced apart via the workpiece 10. When the punch 32 and the pad start moving forward (b), the tip 32-1 and the pad of the punch 32 come into contact with the workpiece 10, and thereafter the workpiece 10 is displaced toward the die 30. The workpiece also abuts on the annular protrusion 30-1 of the die 30, and the work is sandwiched between the die 30, the punch 32, and the pad. As the punch 32 is further advanced, the punch tip 32-1 starts to bite into the workpiece on the side of the punch 32 as shown in (d), and the pad 52 maintains contact with the workpiece, while the elastic member 54 contracts and punches. Further advancement of 32 is allowed, and at the same time, the annular protrusion 30-1 bites into the workpiece on the die 30 side, and as a result, a concave portion 10A is formed in the workpiece on the opposite surface of the annular protrusion 30-1. With the annular protrusion 30-1 forming the concave portion 10A on the die side surface of the workpiece 10, the advancement of the punch 32 continues further as shown in (e), and the punch tip 32-1 bites into the workpiece deeper. In the final stage (f), the punch tip 32-1 penetrates the workpiece and the piercing punching is completed. Also in this embodiment, the concave portion 10A is formed on the workpiece 10 so as to face the die 30, and the punching edge at the time of punching by the punch 32 is positioned at the concave portion 10A. The burrs formed on the punched opening edge stand up from the recessed portion 10A. Therefore, by appropriately setting the height of the annular protrusion 30-1 of the die 30, it is possible to prevent the burrs formed on the die side punching opening edge from protruding from the general surface of the workpiece. Even if it is as it is, there is no influence on the smoothness of the general surface of the workpiece on the die side, and the deburring operation can be omitted. In this embodiment, since the pad 52 is provided, there is an advantage that the work can be reliably held at the outer periphery of the punch when the recess 10A is formed.

以上の実施形態はワークとしての自動車変速機用のクラッチドラムにおけるシール取付孔のピアス加工を専用機により行うものに向けられているが、本発明は専用機によらず汎用のプレス機において行う場合にも実施可能である。この場合、クラッチドラムの空洞部にダイ及びパンチを汎用プレス機のヘッド及びメインスライドに連結する連結具が必要となるが、アイディアとしては相違がなく本発明に包含される。また、ワークとしてもクラッチドラムに限定されず、様々なワークの加工のために利用できることは言うまでもない。   Although the above embodiment is directed to the piercing process of the seal mounting hole in the clutch drum for an automobile transmission as a work by a dedicated machine, the present invention is performed in a general-purpose press machine without using a dedicated machine. Can also be implemented. In this case, a connecting tool for connecting the die and the punch to the head and the main slide of the general-purpose press machine is required in the cavity of the clutch drum, but the idea is not different and is included in the present invention. Needless to say, the workpiece is not limited to the clutch drum and can be used for processing various workpieces.

10…クラッチドラム(ワーク)
10A…凹部
10-1…クラッチドラムの内周筒状部
10-2…クラッチドラムの中間筒状部
10-3…クラッチドラムの外周筒状部
14…環状シール部品用組み付け孔
20…支持台
22…昇降体
24…ワーク外周係合部材
26…ワーク内周保持部
30…ダイ
30-1…環状突起
32…パンチ
50…バリ
52…環状パッド
54…弾性部材
10 ... Clutch drum (work)
10A ... recess
10-1 ... Inner cylindrical part of clutch drum
10-2… Intermediate cylindrical part of clutch drum
10-3 ... outer peripheral cylindrical part 14 of clutch drum ... assembly hole 20 for annular seal part ... support base 22 ... lifting body 24 ... work outer periphery engaging member 26 ... work inner peripheral holding part 30 ... die
30-1 ... annular protrusion 32 ... punch 50 ... burr 52 ... annular pad 54 ... elastic member

Claims (3)

ワークが変速機軸の挿通のための中央の内周筒状部と、クラッチ板の保持のための外周筒状部と、前記内周筒状部及び外周筒状部間の中間筒状部とを備え、かつ外周筒状部にスプライン溝を形成した自動車自動変速機のクラッチドラム用であり、ダイはダイ孔の開口端面に環状突起部を備え、ダイを中間筒状部の内周側に位置させ、パンチを中間筒状部の外周側に位置させ、パンチとダイ間に配置されたワークの中間筒状部に、パンチのダイに対する相対運動により、円周方向に離間した複数の孔を打抜き加工する方法において、ワークは外周筒状部にて直立支持されていると共に、ワークの外周筒状部の外面側において半径方向に往復移動可能に直径上対立位置に外周係合部材が配置され、ワークの回転及び外周係合部材のスプライン溝に対する選択的係合により打抜き箇所へのワークのインデックスを行い、インデックスされた打ち抜き位置においてダイに対するパンチの1サイクルの相対移動によりワークの中間筒状部の打抜き加工を行うようにし、打抜き加工のためのパンチのダイに対する1サイクルの相対移動開始時に、パンチはワークの中間筒状部の対向面より外側に離間位置すると共に、ダイはその環状突起部がワークの中間筒状部の対向面より内側に離間位置し、前記相対移動開始後、打抜き完了前に、ダイに対向したワークの中間筒状部内周面にダイの前記環状突起部はパンチ側とでワークの中間筒状部を上下に加圧挟着することにより凹形状部を形成し、打抜き完了後のパンチによる打抜き縁は前記凹形状部に位置するようにしたことを特徴とする打抜き加工方法。 A central inner peripheral cylindrical portion for inserting a transmission shaft, a peripheral cylindrical portion for holding a clutch plate, and an intermediate cylindrical portion between the inner peripheral cylindrical portion and the outer peripheral cylindrical portion. For use in automobile automatic transmission clutch drums with spline grooves formed in the outer cylindrical part, the die is provided with an annular protrusion on the opening end face of the die hole, and the die is positioned on the inner peripheral side of the intermediate cylindrical part The punch is positioned on the outer peripheral side of the intermediate cylindrical part, and a plurality of holes spaced in the circumferential direction are punched in the intermediate cylindrical part of the workpiece arranged between the punch and the die by relative movement of the punch with respect to the die In the processing method, the workpiece is supported upright by the outer peripheral cylindrical portion, and the outer peripheral engagement member is disposed at the opposite position on the diameter so as to be reciprocally movable in the radial direction on the outer surface side of the outer peripheral cylindrical portion of the workpiece. Rotating the workpiece and spline groove on the outer peripheral engagement member Selectively engageable to index the workpiece to punching positions by which, to perform the punching of the intermediate tubular portion of the workpiece by relative movement of one cycle of the punch to the die in the indexed punching position, the punching At the start of one cycle of relative movement of the punch with respect to the die , the punch is spaced apart from the opposing surface of the intermediate cylindrical portion of the workpiece, and the die has its annular projection on the inner side of the opposing surface of the intermediate cylindrical portion of the workpiece After the start of the relative movement and before punching is completed, the annular projecting portion of the die is added to the inner peripheral surface of the intermediate cylindrical portion of the workpiece facing the die, and the intermediate cylindrical portion of the workpiece is vertically added to the punch side. forming a concave portion by圧挟wear, punching stamping edge by punch after punching completion, characterized in that so as to be positioned in said concave portion Law. 請求項に記載の発明おいて、ダイの環状突起部はパンチと直接協働することでワークを上下に挟着し、前記凹形状部の形成を行うことを特徴とする打抜き加工方法。 The punching method according to claim 1 , wherein the annular projecting portion of the die directly cooperates with the punch to sandwich the workpiece vertically and form the concave portion. 請求項に記載の発明おいて、ダイの環状突起部はパンチに設けたパッドと協働することでワークを上下に挟着し、前記凹形状部の形成を行うことを特徴とする打抜き加工方法。 The punching process according to claim 1 , wherein the annular protrusion of the die cooperates with a pad provided on the punch to sandwich the work up and down to form the concave portion. Method.
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