JPH08332529A - Die for working pierce hole and method thereof - Google Patents
Die for working pierce hole and method thereofInfo
- Publication number
- JPH08332529A JPH08332529A JP14332095A JP14332095A JPH08332529A JP H08332529 A JPH08332529 A JP H08332529A JP 14332095 A JP14332095 A JP 14332095A JP 14332095 A JP14332095 A JP 14332095A JP H08332529 A JPH08332529 A JP H08332529A
- Authority
- JP
- Japan
- Prior art keywords
- die
- hole
- punch
- tip
- pierce
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- Punching Or Piercing (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、比較的厚手の金属板な
どのピアス孔加工に適する孔加工用金型とピアス孔の加
工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole forming die suitable for forming a pierce hole on a relatively thick metal plate and a method for forming a pierce hole.
【0002】[0002]
【従来の技術】各種機械類などに使用される金属製の板
状構造材において、所定位置に孔をあける必要がある場
合、通常のせん断打ち抜きによるピアス孔加工では、ダ
イとポンチを用いてワークに孔をあけるようにしてい
る。通常のピアス孔加工では、図6に示すように、ピア
ス孔2の周りに、程度の差こそあれ、ポンチ側の開口縁
3に「だれ」と呼ばれる深さdの窪んだ形状の部分が生
じ、ダイ側の開口縁4には「かえり」と呼ばれる高さh
の突起状の部分が生じる。2. Description of the Related Art When it is necessary to form a hole at a predetermined position in a metal plate-like structural material used in various machines, in a normal piercing hole processing by shear punching, a work is performed by using a die and a punch. I try to make a hole in it. In the normal piercing hole processing, as shown in FIG. 6, a pitted portion having a depth d called "drip" is formed around the piercing hole 2 to some extent in the opening edge 3 on the punch side. , The height h called "burr" at the opening edge 4 on the die side
The protruding part of
【0003】上記のように単なるピアス孔加工では、ピ
アス孔の周りに不可避的に欠陥部が生じ、特に高張力鋼
板では、上述の「だれ」や「かえり」が顕著に現われる
傾向がある。このようなピアス孔が形成されたワークに
ついて耐久試験を行うと、せん断分離面や上記欠陥部が
破断の起点になって早期に破壊する事例が見られ、単な
るピアス孔をそのままにしておくと疲労強度にとって好
ましくないという問題がある。As described above, mere piercing hole processing inevitably causes a defect portion around the piercing hole, and in particular in a high-strength steel sheet, the above-mentioned "dag" or "burr" tends to appear remarkably. When a durability test is performed on a work with such pierced holes, there are some cases where the shear separation surface or the above-mentioned defective part becomes the starting point of rupture and early destruction occurs. There is a problem that it is not preferable for strength.
【0004】そこで、図7(a)に示すようにコイニン
グポンチ6を用いてワーク1の表面に円環凹状にコイニ
ング加工された部分7を成形したのち、図7(b)に示
すように、上記部分7をピアスポンチ8とダイ9によっ
て打ち抜くことも行われている。この場合、単なるピア
ス孔加工に比べて「だれ」「かえり」の発生が少なくな
り、しかも予めピアス孔の周りがコイニング加工されて
いて加工硬化を生じていることにより、耐久性を向上さ
せることが可能である。Therefore, as shown in FIG. 7 (a), a coining punch 6 is used to mold a portion 7 coined into a concave annular shape on the surface of the work 1, and then as shown in FIG. 7 (b). It is also practiced to punch the above portion 7 with a piercing punch 8 and a die 9. In this case, compared to mere piercing hole processing, the occurrence of "sag" and "burr" is reduced, and since the area around the piercing hole is coined beforehand to cause work hardening, durability can be improved. It is possible.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、上述の
ようにコイニング加工とピアス孔加工の2工程に分けて
実施する場合には、その分だけ工程数が多くなり、加工
に要する設備費用や作業時間が通常のピアス加工よりも
大である。また、ピアス孔加工後に程度の差こそあれ前
述の欠陥部(だれ,かえり等)を生じることが避けられ
ず、疲労強度が低下する原因となっている。However, when the two steps of coining and piercing are separately performed as described above, the number of steps is increased by that much, and the equipment cost and working time required for processing are increased. Is larger than normal piercing. Further, it is inevitable that the above-mentioned defective portions (sags, burrs, etc.) will be produced to some extent after the piercing process, which causes a decrease in fatigue strength.
【0006】従って本発明の目的は、ピアス孔があけら
れたワークの疲労強度を向上させることができるような
ピアス孔の加工を1回のプレス工程で実施できるような
金型とピアス孔の加工方法を提供することにある。Therefore, an object of the present invention is to process a die and a piercing hole so that the working of the piercing hole which can improve the fatigue strength of the work having the piercing hole can be carried out in one pressing step. To provide a method.
【0007】[0007]
【課題を解決するための手段】前記目的を果たすために
開発された本発明のピアス孔加工用金型は、ピアス孔に
応じた形状のダイス穴を有するダイと、上記ダイス穴の
穴幅よりも幅の大きい基部を有するとともに上記ダイス
穴に挿入可能な幅の先端部を有していて上記ダイに対し
て所定位置まで前進した状態において上記先端部が上記
ダイス穴に挿入されるポンチとを具備し、上記ダイス穴
のポンチ側の開口縁部に、ポンチ側に突出しかつその先
端からダイ表面に向って外周面がテーパ状に広がるよう
に傾斜するダイ側テーパ部を有する突縁を設けるととも
に、上記ポンチの先端部と基部との間に、上記ダイ側テ
ーパ部と対向しかつこのポンチの上記先端部から上記基
部に向ってテーパ状に幅が広がるポンチ側テーパ部を設
けたものである。A die for forming a pierce hole of the present invention, which has been developed to achieve the above object, comprises a die having a die hole having a shape corresponding to the pierce hole, and a die width of the die hole. Also has a base having a large width and has a tip portion having a width that can be inserted into the die hole, and a punch in which the tip portion is inserted into the die hole in a state of being advanced to a predetermined position with respect to the die. A punch edge having a die side taper portion that projects toward the punch side and inclines so that the outer peripheral surface tapers toward the die surface from the tip thereof is provided at the punch side opening edge portion of the die hole. A punch-side taper portion that is opposed to the die-side taper portion and has a taper width that widens from the tip-end portion of the punch toward the base portion between the tip portion and the base portion of the punch. .
【0008】また、上記ダイと上記ポンチとを用いる本
発明の孔加工方法は、上記ダイとポンチとの間にワーク
を配置し、ポンチの先端部を上記ダイス穴に進入させて
ワークにピアス孔を打ち抜くとともに更にこのポンチを
所定位置まで前進させることにより、ダイ側テーパ部と
ポンチ側テーパ部とによってピアス孔の内周部を加圧し
てこれらテーパ部に応じた形状にピアス孔の内周部を成
形することを特徴とする加工方法である。Further, in the hole drilling method of the present invention using the die and the punch, the work is arranged between the die and the punch, and the tip of the punch is inserted into the die hole to pierce the work. By punching the punch and advancing the punch further to a predetermined position, the die side taper portion and the punch side taper portion pressurize the inner peripheral portion of the piercing hole to form a shape corresponding to these tapered portions. Is a molding method.
【0009】[0009]
【作用】ダイの上にワークを載置し、ダイに対してポン
チを降下させることにより、ポンチの先端部によってワ
ークにピアス孔が打ち抜かれ、更にポンチが降下するこ
とにより、打ち抜かれたピアス孔の内周部がダイ側テー
パ部とポンチ側テーパ部とによって加圧され、「だれ」
や「かえり」等の欠陥部の発生が回避される。しかもピ
アス孔の内周部が加工硬化を生じるとともに、ピアス孔
の内周部の表面が滑らかでかつ緻密なものとなるなど、
好ましい表面状態が得られる。こうして加工されたピア
ス孔は、通常の孔加工が行われたワークに比べて疲労強
度が大幅に向上し、しかも1回のプレス工程で上記のピ
アス孔加工を実施できるので、作業能率が高い。[Function] The work is placed on the die, and the punch is lowered with respect to the die. The tip of the punch punches a piercing hole in the work. The inner peripheral part of the die is pressed by the die side taper part and the punch side taper part, and
Occurrence of defective portions such as “blur” and the like is avoided. Moreover, work hardening occurs in the inner peripheral part of the piercing hole, and the surface of the inner peripheral part of the piercing hole becomes smooth and dense.
A favorable surface condition is obtained. The pierce hole processed in this manner has a significantly improved fatigue strength as compared with a work that has been subjected to normal hole processing, and since the above pierce hole processing can be performed in one pressing step, the work efficiency is high.
【0010】[0010]
【実施例】以下に本発明の一実施例について、図1ない
し図5を参照して説明する。図1に示すようにピアス孔
加工用の金型10は、図示下側に位置するダイ11と、
ダイ11の上方に設けられたポンチ12とを備えて構成
されている。ポンチ12は図示しないプレス機のポンチ
駆動機構によって上下方向に所定のストロークで往復運
動することができるようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a die 10 for piercing holes includes a die 11 located on the lower side in the drawing,
The punch 12 is provided above the die 11. The punch 12 can reciprocate vertically with a predetermined stroke by a punch driving mechanism of a press machine (not shown).
【0011】ダイ11にダイス穴15が設けられてい
る。このダイス穴15のポンチ側の開口縁部に、外側に
突出する突縁16が設けられている。この突縁16は、
ダイス穴15の全周にわたって環状に連続している。突
縁16の断面形状は、先端17が尖った三角形に近い形
となっている。突縁16の外周面は、その先端17から
根元側(ダイ表面側)に向かってテーパ状に広がるよう
に傾斜したテーパ部18となっている。このテーパ部1
8がダイ11の軸線となす角度θ1 は、おおむね45°
である。A die hole 15 is provided in the die 11. A projecting edge 16 protruding outward is provided at an opening edge portion of the die hole 15 on the punch side. This tongue 16 is
The die hole 15 is continuously annularly formed around the entire circumference. The cross-sectional shape of the projecting edge 16 is a shape close to a triangle with a sharp tip 17. The outer peripheral surface of the projecting edge 16 is a tapered portion 18 that is inclined so as to spread in a taper shape from the tip 17 toward the root side (die surface side). This taper part 1
The angle θ1 formed by 8 with the axis of the die 11 is about 45 °.
Is.
【0012】ダイス穴15の内面は、上下方向の中間部
20から突縁16の先端17にわたる領域では穴幅W1
が実質的に一定であり、中間部20から下側は、僅かに
穴幅W2 が下側にゆくほど増加するようなテーパ形状と
なっている。The inner surface of the die hole 15 has a hole width W1 in the region extending from the intermediate portion 20 in the vertical direction to the tip 17 of the projecting edge 16.
Is substantially constant and has a tapered shape such that the hole width W2 slightly increases from the middle portion 20 to the lower side as it goes downward.
【0013】ポンチ12は、ダイス穴15の穴幅W1 よ
りも大きい幅D1 の基部25と、基部25の下方に連な
りかつ基部25の幅D1 よりも小さな幅D2 の先端部2
6とを有するとともに、基部25と先端部26との間に
このポンチ12の全周にわたって連続するテーパ部27
を備えている。The punch 12 has a base portion 25 having a width D1 larger than the hole width W1 of the die hole 15 and a tip portion 2 connected to the lower side of the base portion 25 and having a width D2 smaller than the width D1 of the base portion 2.
6, and a taper portion 27 which is continuous between the base portion 25 and the tip portion 26 over the entire circumference of the punch 12.
It has.
【0014】ダイス穴15とポンチ12の形状は、打ち
抜くべきピアス孔の形状に応じている。例えば円形のピ
アス孔を打ち抜く場合にはダイス穴15も円形であるか
ら、ポンチ12の基部25と先端部26はいずれも円柱
状のものを用いる。ピアス孔が非円形の場合にはその形
状に応じた形状の基部25と先端部26を有するポンチ
12が採用される。The shapes of the die hole 15 and the punch 12 correspond to the shape of the pierce hole to be punched. For example, when punching out a circular piercing hole, the die hole 15 is also circular, so that both the base portion 25 and the tip portion 26 of the punch 12 are cylindrical. When the pierce hole is non-circular, the punch 12 having the base portion 25 and the tip portion 26 having a shape corresponding to the shape is adopted.
【0015】ポンチ先端部26の幅D2 はダイス穴15
の穴幅W1 よりも若干小さく、この先端部26がダイス
穴15に入り込んだ時に、ダイス穴15の内面とポンチ
先端部26との間に、適当な寸法の隙間(W1 とD2 と
の差)が確保されるようになっている。ポンチ側テーパ
部27がポンチ12の軸線となす角度θ2 は、例えば4
5°前後であるが、この角度θ2 は必要に応じて適宜に
設定される。The width D2 of the punch tip 26 is defined by the die hole 15
Is slightly smaller than the hole width W1 of the punch hole, and when this tip portion 26 enters the die hole 15, a clearance of a proper size (difference between W1 and D2) between the inner surface of the die hole 15 and the punch tip portion 26. Is being secured. The angle θ2 formed by the punch side taper portion 27 and the axis of the punch 12 is, for example, 4
Although it is about 5 °, this angle θ2 is appropriately set as necessary.
【0016】次に、上記構成のピアス孔加工用金型10
の作用について説明する。ダイ11の上にセットされる
ワーク1の一例は、例えば構造材に使用される板厚が数
mm程度の高張力鋼板である。図1に示すように、ダイ
11の上にワーク1をセットし、図示しないポンチ駆動
機構によってポンチ12を降下させる。なお、ワーク1
の上面側は、ポンチ12の周りにおいて、図示しないワ
ーク押さえリングないしストリッパ等によって押さえる
ようにしている。Next, the die 10 for forming a pierce hole having the above structure.
The operation of will be described. An example of the work 1 set on the die 11 is, for example, a high-tensile steel plate having a plate thickness of about several mm used for a structural material. As shown in FIG. 1, the work 1 is set on the die 11, and the punch 12 is lowered by a punch driving mechanism (not shown). In addition, work 1
The upper surface side of the above is pressed around the punch 12 by a work pressing ring or a stripper (not shown).
【0017】ポンチ12が降下すると、図2に示すよう
にポンチ12の先端部26がダイス穴15に進入するこ
とにより、ワーク1が打ち抜かれてピアス孔30があく
とともに、抜き屑1aがポンチ12の下方に落とされ
る。When the punch 12 descends, the tip portion 26 of the punch 12 enters the die hole 15 as shown in FIG. 2, whereby the work 1 is punched out to form the pierce hole 30 and the scrap 1a is punched. Dropped below.
【0018】更にポンチ12が所定の下降側ストローク
端まで降下することにより、図3に示すように、ダイ側
テーパ部18とポンチ側テーパ部27とによって、ピア
ス孔30の内周部31,32が加圧される。こうして加
工されたピアス孔30は、図4に示されるように、内周
部31,32がテーパ状に成形され、「だれ」や「かえ
り」等の欠陥の発生が回避されるとともに、この内周部
31,32を含むピアス孔30の周縁部分が加工硬化を
生じる。しかもピアス孔30の内周部31,32の表面
が平滑かつ緻密なものとなる。また、上記金型10を用
いたピアス孔加工を冷間で行えば、ピアス孔30の周縁
部分に、疲れ強さを高める上で好ましいファイバーフロ
ー(材料の繊維組織の流れ)が生じ、更に効果的に疲労
強度が向上する。As the punch 12 further descends to a predetermined stroke end on the descending side, the inner peripheral portions 31, 32 of the piercing hole 30 are formed by the die side taper portion 18 and the punch side taper portion 27 as shown in FIG. Is pressurized. As shown in FIG. 4, in the pierce hole 30 thus processed, the inner peripheral portions 31 and 32 are formed in a tapered shape to prevent the occurrence of defects such as “dare” and “burr”, and Work hardening occurs in the peripheral portion of the piercing hole 30 including the peripheral portions 31 and 32. Moreover, the surfaces of the inner peripheral portions 31 and 32 of the piercing hole 30 are smooth and dense. Further, if the piercing hole processing using the mold 10 is performed cold, a preferable fiber flow (flow of the fiber structure of the material) for increasing the fatigue strength is generated in the peripheral portion of the piercing hole 30, which is further effective. Fatigue strength is improved.
【0019】図5は各種ワークの耐久試験を実施した結
果を示している。この耐久試験は、長方形の高張力鋼板
(HTP55材)からなるテストピースに規定の応力振
幅で引っ張り荷重を繰り返し負荷し、破断に至るまでの
繰返し数を調査したものである。図5において、線分A
は孔を設けなかったテストピースであり、疲労強度が最
も高い。FIG. 5 shows the results of carrying out durability tests on various works. In this durability test, a tensile load was repeatedly applied to a test piece made of a rectangular high-strength steel plate (HTP55 material) with a prescribed stress amplitude, and the number of repetitions until fracture was investigated. In FIG. 5, line segment A
Is a test piece with no holes and has the highest fatigue strength.
【0020】これに対し、本実施例の金型10を用いて
ピアス孔30をあけたテストピースは、線分Bに示すよ
うに、孔を設けなかったテストピースにつぐ疲労強度を
発揮できることが確認された。線分Cは、コイニング加
工後にピアス孔加工を行ったもの(図7)であり、本実
施例のものよりも耐久性がかなり低くなっている。線分
Dはピアス孔加工後に孔の周りを機械加工によって面取
りしたものである。線分Eはピアス孔加工をしたままの
ものであり、孔のせん断分離面がかなり荒れた状態とな
っているため耐久性が低いものとなっている。On the other hand, the test piece having the piercing hole 30 formed by using the mold 10 of this embodiment can exhibit fatigue strength comparable to the test piece having no hole as shown by the line segment B. confirmed. The line segment C is obtained by performing piercing hole processing after coining processing (FIG. 7), and has much lower durability than that of the present embodiment. A line segment D is a chamfer around the hole after machining the piercing hole. The line segment E is the one that has been subjected to the pierce hole processing, and the shear separation surface of the hole is in a considerably rough state, so that the durability is low.
【0021】[0021]
【発明の効果】本発明によれば、ピアス孔の周縁部に
「だれ」や「かえり」などの欠陥部が生じることを防止
でき、ピアス孔の内周部の表面状態を疲労強度を高める
上で好ましい状態に加工できるとともに、ピアス孔まわ
りの加工硬化などによって疲労強度を高めることができ
る。特に、高張力鋼板に冷間で上記のピアス孔を加工す
ると上記効果が顕著である。そして本発明では上記ピア
ス孔加工を1回のプレス工程で行うことができ、従来の
ようにコイニング加工とピアス孔加工との2工程を実施
していた場合に比べて作業能率がきわめて高い。According to the present invention, it is possible to prevent the occurrence of defects such as "sag" and "burr" at the peripheral portion of the piercing hole, and to improve the fatigue strength of the surface condition of the inner peripheral portion of the piercing hole. In addition to being able to be processed into a preferable state, the fatigue strength can be increased by work hardening around the pierce holes. In particular, when the high-strength steel plate is cold-worked with the pierce hole, the above effect is remarkable. Further, in the present invention, the above-mentioned piercing hole processing can be performed in one pressing step, and the work efficiency is extremely high compared to the case where two steps of coining processing and piercing hole processing are conventionally performed.
【図1】本発明の一実施例を示すピアス孔加工用金型の
一部の縦断面図。FIG. 1 is a vertical cross-sectional view of a part of a die for piercing holes showing an embodiment of the present invention.
【図2】図1に示された金型によってピアス孔を打ち抜
く途中の断面図。FIG. 2 is a cross-sectional view in the process of punching out a pierce hole with the mold shown in FIG.
【図3】図1に示された金型によってピアス孔を打ち抜
いた状態の断面図。FIG. 3 is a cross-sectional view showing a state where a pierce hole is punched out by the mold shown in FIG.
【図4】図1に示された金型によってピアス孔が打ち抜
かれたワークの断面図。FIG. 4 is a cross-sectional view of a work in which pierce holes are punched out by the mold shown in FIG.
【図5】各種テストピースの疲労強度を示す図。FIG. 5 is a diagram showing the fatigue strength of various test pieces.
【図6】従来のピアス孔が形成されたワークの一部の断
面図。FIG. 6 is a cross-sectional view of a part of a conventional work in which pierce holes are formed.
【図7】従来のピアス孔加工方法の一例を工程順に示す
断面図。FIG. 7 is a cross-sectional view showing an example of a conventional piercing hole processing method in the order of steps.
1…ワーク 10…金型 11…ダイ 12…ポンチ 15…ダイス穴 16…突縁 18…ダイ側テーパ部 25…ポンチの基部 26…ポンチの先端部 27…ポンチ側テーパ部 30…ピアス孔 DESCRIPTION OF SYMBOLS 1 ... Work 10 ... Mold 11 ... Die 12 ... Punch 15 ... Die hole 16 ... Projection edge 18 ... Die side taper part 25 ... Punch base part 26 ... Punch tip part 27 ... Punch side taper part 30 ... Pierce hole
Claims (4)
金型であって、 上記ピアス孔に応じた形状のダイス穴を有するダイと、 上記ダイス穴の穴幅よりも幅の大きい基部を有するとと
もに上記ダイス穴に挿入可能な幅の先端部を有していて
上記ダイに対して所定位置まで前進した状態において上
記先端部が上記ダイス穴に挿入されるポンチとを具備
し、 上記ダイス穴のポンチ側の開口縁部に、ポンチ側に突出
しかつその先端からダイ表面に向って外周面がテーパ状
に広がるように傾斜するダイ側テーパ部を有する突縁を
設けるとともに、 上記ポンチの先端部と基部との間に、上記ダイ側テーパ
部と対向しかつこのポンチの上記先端部から上記基部に
向ってテーパ状に幅が広がるポンチ側テーパ部を設けた
ことを特徴とするピアス孔加工用金型。1. A die for forming a piercing hole in a plate-shaped work, the die having a die hole having a shape corresponding to the piercing hole, and a base having a width larger than the hole width of the die hole. And a punch having a tip portion having a width that can be inserted into the die hole and being advanced to a predetermined position with respect to the die, the tip portion being inserted into the die hole. At the punch edge of the hole, there is provided a projecting edge having a die side taper portion that projects toward the punch side and inclines so that the outer peripheral surface tapers from the tip toward the die surface. A piercing hole drilling characterized in that a punch side taper portion is provided between the base portion and the base portion so as to face the die side taper portion and widen in a taper shape from the tip end portion of the punch toward the base portion. Money Type.
り、かつ、このポンチの基部が前記先端部よりも大径な
円柱状をなしており、前記ポンチ側テーパ部がポンチの
全周に設けられているとともに、前記ダイ側テーパ部が
ダイの全周に設けられていることを特徴とする請求項1
記載のピアス孔加工用金型。2. The tip of the punch has a cylindrical shape, the base of the punch has a cylindrical shape with a diameter larger than that of the tip, and the punch side taper portion is the entire circumference of the punch. 2. The die side taper portion is provided on the entire circumference of the die.
Mold for piercing hole described.
突縁を有しかつこの突縁の外周面がその先端から根元側
に向ってテーパ状に広がるテーパ部となっているダイ
と、 上記ダイス穴の穴幅よりも幅の大きい基部と上記ダイス
穴に挿入可能な幅の先端部とを有しかつ上記先端部と基
部との間にテーパ状に幅が広がるテーパ部を有するポン
チとを用い、 上記ダイとポンチとの間にワークを配置し、 上記ポンチの先端部を上記ダイス穴に進入させて上記ワ
ークにピアス孔を打ち抜くとともに更にこのポンチを所
定位置まで前進させることにより、上記ダイ側テーパ部
とポンチ側テーパ部とによってピアス孔の内周部を加圧
してこれらテーパ部に応じた形状にピアス孔の内周部を
成形することを特徴とするピアス孔の加工方法。3. A die having a projecting edge projecting toward the punch side at an opening edge portion of the die hole, and an outer peripheral surface of the projecting edge being a taper portion expanding in a taper shape from a tip end thereof toward a root side. A punch having a base portion having a width larger than the hole width of the die hole and a tip portion having a width insertable into the die hole, and having a taper portion having a taper width between the tip portion and the base portion. By using, and arranging a work between the die and the punch, by making the tip of the punch enter the die hole to punch out the pierce hole in the work and further advancing the punch to a predetermined position, A method for processing a pierce hole, characterized in that the die-side taper portion and the punch-side taper portion press the inner peripheral portion of the pierce hole to form the inner peripheral portion of the pierce hole into a shape corresponding to these tapered portions.
ス孔加工を冷間で行うことを特徴とする請求項3記載の
ピアス孔の加工方法。4. The method of processing a piercing hole according to claim 3, wherein the work is a high-strength steel plate, and the piercing hole processing is performed cold.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14332095A JPH08332529A (en) | 1995-06-09 | 1995-06-09 | Die for working pierce hole and method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14332095A JPH08332529A (en) | 1995-06-09 | 1995-06-09 | Die for working pierce hole and method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08332529A true JPH08332529A (en) | 1996-12-17 |
Family
ID=15336049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14332095A Withdrawn JPH08332529A (en) | 1995-06-09 | 1995-06-09 | Die for working pierce hole and method thereof |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08332529A (en) |
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-
1995
- 1995-06-09 JP JP14332095A patent/JPH08332529A/en not_active Withdrawn
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Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020903 |