JP3823726B2 - Mold equipment - Google Patents

Mold equipment Download PDF

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Publication number
JP3823726B2
JP3823726B2 JP2000400457A JP2000400457A JP3823726B2 JP 3823726 B2 JP3823726 B2 JP 3823726B2 JP 2000400457 A JP2000400457 A JP 2000400457A JP 2000400457 A JP2000400457 A JP 2000400457A JP 3823726 B2 JP3823726 B2 JP 3823726B2
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JP
Japan
Prior art keywords
step bending
hole
punch
workpiece
processing
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.)
Expired - Fee Related
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JP2000400457A
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Japanese (ja)
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JP2002192263A (en
Inventor
英夫 森田
達彦 山下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
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Application filed by Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Panasonic Corp
Priority to JP2000400457A priority Critical patent/JP3823726B2/en
Publication of JP2002192263A publication Critical patent/JP2002192263A/en
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Publication of JP3823726B2 publication Critical patent/JP3823726B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、薄板帯状形状の金属材に対して段差曲げ加工を行うために使用する金型装置に関するものである。
【0002】
【従来の技術】
従来における、薄板帯状形状の金属材に対して段差曲げ加工を行うために使用する金型装置について図面を用いて説明する。
【0003】
図4は従来における段差曲げ加工のための金型装置の要部断面図、図5(a)は同段差曲げ加工済における形状例の斜視図、図5(b)は同要部拡大斜視図である。
【0004】
図4において、1はワークである薄板帯状形状の金属材でなる被加工体、2は超鋼材でなる段差曲げパンチであり、下端に所定形状に段差曲げ加工するための加工部3を設けており、上部がパンチプレート4に固定されている。5は段差曲げパンチ2が挿通する孔6を有し、被加工体1を押え保持する材料押えプレート、7はパンチプレート4の上面に密着固定した上バッキングプレート、8は上バッキングプレート7の上面に密着固定した上下移動自在なパンチホルダーである。
【0005】
9は下先端を材料押えプレート5の上面端部に固着した吊りボルトであり、その本体部はパンチプレート4および上バッキングプレート7を挿通した挿通孔を上下移動自在に挿通し、またその上端部はパンチホルダー8に設けられた孔内に突出している。そして、前記孔内に配設した圧縮バネ10と止めネジ11により、材料押えプレート5を下方向に付勢している。以上により上型を構成している。
【0006】
12は段差曲げパンチ2の加工部3に対向した加工部13を上端に設けた超鋼材でなる段差曲げダイであり、下部でダイプレート14に固定されている。15はダイプレート14の下面に密着固定した下バッキングプレート、16は下バッキングプレート15の下面に密着固定したダイホルダーである。
【0007】
17は被加工体1を段差曲げパンチ2と段差曲げダイ12で所定形状に段差曲げ加工する際に、被加工体1を上方向に付勢しながら保持する材料押えピンであり、下端部はダイホルダー16に設けられた孔内に突出しており、その孔内に配設した圧縮バネ18と止めネジ19により材料押えピン17を上方向に付勢している。以上により下型を構成している。
【0008】
前記構成による段差曲げ加工のための金型装置において、被加工体1を送り方向にピッチで移送し、パンチホルダー8の上下移動動作による段差曲げパンチ2と段差曲げダイ12により、被加工体1に対して所定の曲げ加工を行うのである。
【0009】
【発明が解決しようとする課題】
しかしながら、前記従来の段差曲げ加工のための金型装置では、特に金属材が薄板形状で曲げRが小さく、段差の大きい加工を行う際に、図5(a),(b)に示すように、被加工体1を段差曲げ加工する工程において、矢印で示す方向に被加工体1を伸長しようとする応力が発生するため、段差曲げコーナー部でクラック21が発生したり、あるいは被加工体1に亀裂の発生や引き千切れたりして、所定の段差曲げ形状や寸法が得られないという課題を有していた。
【0010】
本発明は、前記課題を解決しようとするものであり、供給し移送された被加工体1を段差曲げコーナー部において、クラック、亀裂の発生あるいは引き千切れが無く、高精度に所定の段差曲げ形状や寸法を得ることができる金型装置を提供することを目的とするものである。
【0011】
本発明の請求項1に記載の発明は、被加工体に段差曲げ部を加工する一対の段差曲げパンチおよび段差曲げダイと、前記段差曲げ部の端部近傍に長円や楕円孔など所定形状の打抜き孔を加工する一対の打抜きパンチおよび加工孔部とを備え、前記打抜き孔を施して前記段差曲げ加工を行う金型装置であって、前記打抜き孔と前記段差曲げ部との継ぎ部の長さを、前記段差曲げ部より長くするとともに、前記打抜き孔の径を前記継ぎ部の幅の4倍程度とした金型装置としたものであり、薄板材で曲げRが小さく、段差が大きくても、クラック、亀裂の発生および引き千切れが無く段差曲げ加工ができるという作用を有する。
【0012】
本発明の請求項1に記載の発明は、被加工体の段差曲げ加工部の近傍に打抜き孔を設け、その打抜き孔は残存する被加工体の部分より長手方向および幅方向ともに大きく長円あるいは楕円の形状とし、段差曲げ加工部との継ぎ部分は延伸して円滑に段差曲げ加工部分に引き込まれることにより所定の段差曲げ加工を行うように構成した金型装置としたものであり、薄板材で曲げRが小さく、段差が大きくても、クラック、亀裂の発生および引き千切れが無く段差曲げ加工ができるという作用を有する。
【0015】
【発明の実施の形態】
(実施の形態1)
以下、本発明の実施の形態における段差曲げ加工のための金型装置について図面を用いて説明する。図1は本発明の実施の形態における段差曲げ加工のための金型装置の要部断面図、図2(a)は同被加工体を段差曲げ加工した斜視図、同(b)はその要部拡大斜視図、図3(a),(b)は同打抜き孔を施した事例の要部の平面図および側面図である。
【0016】
図1において、32は超鋼材でなる打抜きパンチであり、前記従来の技術において説明した被加工体1を長円や楕円孔など所定形状に打抜き加工するための加工部41を下端に設けており、上部が鋼材でなるパンチプレート34に固着されている。33は超鋼材でなり、被加工体1を所定形状に段差曲げ加工するための加工部42を下端に設けた段差曲げパンチであり、打抜きパンチ32とは所定ピッチで連接しており、上部がパンチプレート34に固着されている。
【0017】
35はパンチプレート34の上面に密着固定した鋼材でなる上バッキングプレート、36は上バッキングプレート35の上面を密着固定した鋼材でなり上下移動自在なパンチホルダーである。37は打抜きパンチ32および段差曲げパンチ33の挿通する孔52、孔53および孔54を有する鋼材でなる材料押えプレート、38は下端部を材料押えプレート37の上面に固着した吊りボルトである。
【0018】
吊りボルト38の本体部は上バッキングプレート35に設けた挿通孔を上下移動自在に挿通し、また、その上端部は上バッキングプレート35に設けた孔を挿通し、上下移動自在なパンチホルダー36の下面で規制される事により、材料押えプレート37を垂直方向の所定位置に保持している。39は圧縮バネであり、上下移動自在なパンチホルダー36に設けられた孔内に配設され、上端は止めネジ40によりパンチホルダー36に保持され、下端は吊りボルト38の上面に当接して、吊りボルト38を下方向に付勢している。以上により上型部を構成している。
【0019】
43は前記段差曲げパンチ33の先端部における加工部42と対向した加工部50を先端に設けた超鋼材でなる段差曲げダイ、44は鋼材でなる材料押えピンであり、下端部は鋼材でなるダイホルダー49に設けられた孔内に突出しており、その孔内に配設した圧縮バネ45と止めネジ46により、被加工体1を段差曲げパンチ33と段差曲げダイ43により所定形状に段差曲げ加工する際に、被加工体1を上方向に付勢し保持するのである。
【0020】
51は前記打抜きパンチ32の先端部における加工部41が挿入される加工孔部、47は前記加工孔部51を設けられ、段差曲げダイ43を内蔵し固着している鋼材でなるダイプレート、48はダイプレート47の下面に密着固定し、加工孔部51に連通する加工後の不要材などの排出孔55を有する鋼材でなる下バッキングプレートである。そして、49は下バッキングプレート48の下面に密着固定し、前記排出孔55に連通する排出孔56を有する鋼材でなるダイホルダーである。以上により下型部を構成している。
【0021】
次に前記構成による段差曲げ加工のための金型装置の動作について説明する。すなわち、被加工体1を送り方向に所定ピッチ移送し所定位置に供給した後、パンチホルダー36の上下移動動作により打抜きパンチ32と加工孔部51、および段差曲げパンチ33と段差曲げダイ43により、所定の孔の打抜きと段差曲げ加工を行うのである。
【0022】
さて、前記動作の加工順序は、被加工体1を所定位置に移送し供給した後、パンチホルダー36を降下させて、被加工体1を材料押えプレート37、ダイプレート47および材料押えピン44により保持する。そして、さらにパンチホルダー36を降下させて、まず打抜きパンチ32の加工部41と対向する加工孔部51により、図2および図3に示すように被加工体1の段差曲げ加工部62の直線延長上でかつ加工済み製品における端部近傍に打抜き孔60を打抜き加工する。同時あるいは続けてパンチホルダー36を降下させて、段差曲げパンチ33の加工部42と段差曲げダイ43の加工部50により、被加工体1の所定箇所に所定形状、寸法の段差曲げ加工を施すのである。
【0023】
図3は打抜き孔60の形状例であり、被加工体1の段差曲げ加工部62の長手方向両端で加工済み製品における端部近傍に、長手方向l1は段差曲げ加工部62の幅l2以上大きく両方にはみ出し、また幅方向w1は残存する部分w2の4倍程度の幅としてなる長円あるいは楕円の形状としているのである。
【0024】
前記の打抜き孔60を施した後、被加工体1における厚みの5倍程度の高さ、そして厚みより小さい曲げRによる段差曲げ加工をする際、図2(b)に示すように矢印方向に継ぎ61が延伸して円滑に引き込まれることにより、クラック、亀裂の発生および引き千切れが無く所定の段差曲げ加工ができるのである。なお、63は被加工体1を所定ピッチで移送するためのガイド孔である。
【0025】
【発明の効果】
以上のように本発明の、被加工体に段差曲げ部を加工する一対の段差曲げパンチおよび段差曲げダイと、前記段差曲げ部の端部近傍に長円や楕円孔など所定形状の打抜き孔を加工する一対の打抜きパンチおよび加工孔部とを備え、前記打抜き孔を施して前記段差曲げ加工を行う金型装置によれば、前記打抜き孔と前記段差曲げ部との継ぎ部の長さを、前記段差曲げ部より長くするとともに、前記打抜き孔の径を前記継ぎ部の幅の4倍程度とするため段差曲げ加工する際に、打抜き孔と段差曲げ加工部との間に形成された継ぎ部を延伸させることができ、その結果、薄板材でその厚みより小さい曲げRや、段差が大きくても、クラック、亀裂、引き千切れが無い段差曲げ加工が可能になるという効果を有する。
【図面の簡単な説明】
【図1】本発明の実施の形態における段差曲げ加工のための金型装置の要部断面図
【図2】(a)同被加工体を段差曲げ加工した要部斜視図
(b)その要部拡大斜視図
【図3】(a)同打抜き孔を施した被加工体の要部平面図
(b)同側面図
【図4】従来における段差曲げ加工のための金型装置の要部断面図
【図5】(a)同段差曲げ加工済における形状例の要部斜視図
(b)その要部拡大斜視図
【符号の説明】
1 被加工体
2,33 段差曲げパンチ
3,13,41,42,50 加工部
4,34 パンチプレート
5,37 材料押えプレート
6,52,53,54 孔
7,35 上バッキングプレート
8,36 パンチホルダー
9,38 吊りボルト
10,18,39,45 圧縮バネ
11,19,40,46 止めネジ
12,43 段差曲げダイ
14,47 ダイプレート
15,48 下バッキングプレート
16,49 ダイホルダー
17,44 材料押えピン
21 クラック
32 打抜きパンチ
51 加工孔部
55,56 排出孔
60 打抜き孔
61 継ぎ
62 段差曲げ加工部
63 ガイド孔
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold apparatus used to perform a step bending process on a thin metal strip-shaped metal material.
[0002]
[Prior art]
A conventional mold apparatus used to perform a step bending process on a thin metal strip metal material will be described with reference to the drawings.
[0003]
4 is a cross-sectional view of a main part of a conventional mold apparatus for step bending, FIG. 5A is a perspective view of a shape example after the step bending, and FIG. 5B is an enlarged perspective view of the main part. It is.
[0004]
In FIG. 4, 1 is a workpiece made of a thin strip-shaped metal material as a workpiece, 2 is a step bending punch made of super steel material, and a processing portion 3 for bending the step into a predetermined shape is provided at the lower end. The upper part is fixed to the punch plate 4. 5 is a material presser plate having a hole 6 through which the step bending punch 2 is inserted, and presses and holds the workpiece 1. 7 is an upper backing plate that is closely fixed to the upper surface of the punch plate 4, and 8 is an upper surface of the upper backing plate 7. It is a punch holder that can be moved up and down and fixed in close contact.
[0005]
9 is a suspension bolt whose lower end is fixed to the upper end portion of the material presser plate 5, and its main body portion is inserted through an insertion hole through which the punch plate 4 and the upper backing plate 7 are inserted so as to be movable up and down, and its upper end portion Protrudes into a hole provided in the punch holder 8. The material presser plate 5 is urged downward by the compression spring 10 and the set screw 11 disposed in the hole. The upper mold | type is comprised by the above.
[0006]
Reference numeral 12 denotes a step bending die made of a super steel material provided with a processing portion 13 facing the processing portion 3 of the step bending punch 2 at the upper end, and is fixed to the die plate 14 at the lower portion. Reference numeral 15 denotes a lower backing plate that is tightly fixed to the lower surface of the die plate 14, and 16 is a die holder that is fixed to the lower surface of the lower backing plate 15.
[0007]
Reference numeral 17 denotes a material presser pin for holding the workpiece 1 while urging the workpiece 1 in an upward direction when the workpiece 1 is bent into a predetermined shape by the step bending punch 2 and the step bending die 12. It protrudes into a hole provided in the die holder 16, and the material pressing pin 17 is urged upward by a compression spring 18 and a set screw 19 disposed in the hole. The lower mold is configured as described above.
[0008]
In the mold apparatus for step bending with the above configuration, the workpiece 1 is transferred at a pitch in the feed direction, and the workpiece 1 is moved by the step bending punch 2 and the step bending die 12 by the vertical movement operation of the punch holder 8. Is subjected to a predetermined bending process.
[0009]
[Problems to be solved by the invention]
However, in the conventional mold apparatus for step bending, as shown in FIGS. 5 (a) and 5 (b), when a metal material is a thin plate and bending R is small and processing with a large step is performed. In the step of bending the workpiece 1 with a step, a stress is generated to extend the workpiece 1 in the direction indicated by the arrow, so that a crack 21 is generated at the step bending corner or the workpiece 1 is bent. In other words, there is a problem that a predetermined step bending shape and dimensions cannot be obtained due to occurrence of cracks or tearing.
[0010]
The present invention is intended to solve the above-described problem, and the workpiece 1 supplied and transferred has no predetermined step bending at a step bending corner portion with no cracks, generation of cracks or tearing. An object of the present invention is to provide a mold apparatus capable of obtaining a shape and dimensions.
[0011]
The invention according to claim 1 of the present invention includes a pair of step bending punches and a step bending die for processing a step bending portion on a workpiece, and a predetermined shape such as an ellipse or an elliptic hole near the end of the step bending portion. A die device that includes a pair of punching punches and a processing hole portion for processing the punching holes, and performs the step bending process by applying the punching holes, wherein a joint portion between the punching hole and the step bending portion is provided. The mold device has a length longer than the step bending portion and the diameter of the punched hole is about four times the width of the joint portion. However, there is an effect that a step bending can be performed without cracks, generation of cracks and tearing.
[0012]
According to the first aspect of the present invention , a punching hole is provided in the vicinity of the step bending portion of the workpiece, and the punching hole is larger in both the longitudinal direction and the width direction than the remaining portion of the workpiece. an elliptical shape, joint portion between the stepped bent portion is for the predetermined step bent configuration the mold apparatus so as to perform by being drawn into smooth stepped bent portion extends, thin plate Even when the bending R is small and the step is large, there is an effect that the step bending can be performed without cracks, generation of cracks and tearing .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, a mold apparatus for step bending in an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a mold apparatus for step bending in the embodiment of the present invention, FIG. 2 (a) is a perspective view of the workpiece to be bent, and FIG. FIG. 3A and FIG. 3B are a plan view and a side view of the main part of an example in which the punched holes are provided.
[0016]
In FIG. 1, 32 is a punching punch made of super steel material, and a lower end is provided with a processing portion 41 for punching the workpiece 1 described in the prior art into a predetermined shape such as an ellipse or an elliptical hole. The upper part is fixed to a punch plate 34 made of steel. 33 is a step bending punch made of super steel material and provided with a processing portion 42 at the lower end for step bending the workpiece 1 into a predetermined shape, and is connected to the punching punch 32 at a predetermined pitch, It is fixed to the punch plate 34.
[0017]
Reference numeral 35 denotes an upper backing plate made of a steel material that is closely fixed to the upper surface of the punch plate 34, and 36 denotes a punch holder that is made of a steel material that has the upper surface of the upper backing plate 35 fixedly fixed thereto and is movable up and down. Reference numeral 37 denotes a material pressing plate made of a steel material having holes 52, 53 and 54 through which the punching punch 32 and the step bending punch 33 are inserted, and 38 is a suspension bolt whose lower end is fixed to the upper surface of the material pressing plate 37.
[0018]
The main body of the suspension bolt 38 is inserted through an insertion hole provided in the upper backing plate 35 so as to be movable up and down, and the upper end thereof is inserted through a hole provided in the upper backing plate 35 so that the punch holder 36 is movable up and down. The material pressing plate 37 is held at a predetermined position in the vertical direction by being restricted by the lower surface. Reference numeral 39 denotes a compression spring, which is disposed in a hole provided in the vertically movable punch holder 36, and has an upper end held by the punch holder 36 by a set screw 40, and a lower end abutting against the upper surface of the suspension bolt 38, The suspension bolt 38 is urged downward. The upper mold | type part is comprised by the above.
[0019]
43 is a step bending die made of super steel material provided with a processing part 50 at the tip of the step bending punch 33 facing the processing part 42, 44 is a material presser pin made of steel, and the lower end part is made of steel. The workpiece 1 protrudes into a hole provided in the die holder 49, and the workpiece 1 is bent into a predetermined shape by the step bending punch 33 and the step bending die 43 by the compression spring 45 and the set screw 46 disposed in the hole. When processing, the workpiece 1 is biased upward and held.
[0020]
51 is a processing hole portion into which the processing portion 41 is inserted at the tip of the punching punch 32, 47 is a die plate made of a steel material provided with the processing hole portion 51 and having a built-in step bending die 43, 48. Is a lower backing plate made of a steel material that is tightly fixed to the lower surface of the die plate 47 and has a discharge hole 55 such as an unnecessary material after processing that communicates with the processing hole portion 51. Reference numeral 49 denotes a die holder made of a steel material that is closely fixed to the lower surface of the lower backing plate 48 and has a discharge hole 56 communicating with the discharge hole 55. The lower mold part is configured as described above.
[0021]
Next, the operation of the mold apparatus for the step bending process with the above configuration will be described. That is, after the workpiece 1 is transported at a predetermined pitch in the feed direction and supplied to a predetermined position, the punching punch 32 and the processing hole 51, and the step bending punch 33 and the step bending die 43 are moved by the vertical movement of the punch holder 36. A predetermined hole is punched and a step bending process is performed.
[0022]
The processing sequence of the operation is as follows. After the workpiece 1 is transferred and supplied to a predetermined position, the punch holder 36 is lowered, and the workpiece 1 is moved by the material pressing plate 37, the die plate 47 and the material pressing pin 44. Hold. Then, the punch holder 36 is further lowered, and first, a linear extension of the step bending portion 62 of the workpiece 1 as shown in FIGS. 2 and 3 by the processing hole portion 51 facing the processing portion 41 of the punching punch 32. The punching hole 60 is punched near the end of the processed product. At the same time or successively, the punch holder 36 is lowered, and a step bending process of a predetermined shape and size is performed on a predetermined portion of the workpiece 1 by the processing portion 42 of the step bending punch 33 and the processing portion 50 of the step bending die 43. is there.
[0023]
FIG. 3 shows an example of the shape of the punched hole 60. The longitudinal direction l 1 is the width l 2 of the step bending portion 62 near the end of the processed product at both ends in the longitudinal direction of the step bending portion 62 of the workpiece 1. The width direction w 1 has a shape of an ellipse or an ellipse having a width about four times that of the remaining portion w 2 .
[0024]
After performing the punching hole 60, when performing step bending with a bending R that is about five times the thickness of the workpiece 1 and smaller than the thickness, as shown in FIG. By extending and smoothly drawing the joint 61, a predetermined step bending process can be performed without cracks, generation of cracks and tearing. Reference numeral 63 denotes a guide hole for transferring the workpiece 1 at a predetermined pitch.
[0025]
【The invention's effect】
As described above, according to the present invention, a pair of step bending punches and a step bending die for processing a step bending portion on a workpiece, and a punching hole having a predetermined shape such as an ellipse or an elliptic hole near the end of the step bending portion. According to a mold apparatus that includes a pair of punching punches and a processing hole portion, and performs the step bending process by applying the punching hole, the length of a joint portion between the punching hole and the step bending portion is In order to make the punched hole longer than the step bent portion and the diameter of the punched hole to be about four times the width of the jointed portion, the joint formed between the punched hole and the step bent processed portion when the step bending is performed. As a result, there is an effect that a bending R smaller than the thickness of the thin plate material or a step bending process without cracks, cracks and tearing can be achieved even if the step is large.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of a mold apparatus for step bending in an embodiment of the present invention. FIG. 2 (a) is a perspective view of an essential part obtained by bending a step of the workpiece (b). [FIG. 3] (a) Plan view of the main part of the workpiece with the punched holes (b) Side view thereof [FIG. 4] Cross section of the main part of a conventional mold apparatus for step bending [FIG. 5] (a) Perspective perspective view of an example of a shape in the same step bending process (b) Enlarged perspective view of the relevant part [Explanation of symbols]
1 Workpiece 2, 33 Step bending punch 3, 13, 41, 42, 50 Machining part 4, 34 Punch plate 5, 37 Material presser plate 6, 52, 53, 54 Hole 7, 35 Upper backing plate 8, 36 Punch Holder 9, 38 Hanging bolt 10, 18, 39, 45 Compression spring 11, 19, 40, 46 Set screw 12, 43 Step bending die 14, 47 Die plate 15, 48 Lower backing plate 16, 49 Die holder 17, 44 Material Presser pin 21 Crack 32 Punch punch 51 Processing hole 55, 56 Discharge hole 60 Punch hole 61 Joint 62 Step bending process part 63 Guide hole

Claims (1)

被加工体に段差曲げ部を加工する一対の段差曲げパンチおよび段差曲げダイと、前記段差曲げ部の端部近傍に長円や楕円孔など所定形状の打抜き孔を加工する一対の打抜きパンチおよび加工孔部とを備え、前記打抜き孔を施して前記段差曲げ加工を行う金型装置であって、前記打抜き孔と前記段差曲げ部との継ぎ部の長さを、前記段差曲げ部より長くするとともに、前記打抜き孔の径を前記継ぎ部の幅の4倍程度とした金型装置。A pair of step bending punch and step bending die for processing a step bending portion on a workpiece, and a pair of punching punch and processing for processing a punch hole of a predetermined shape such as an ellipse or an elliptic hole near the end of the step bending portion. A mold apparatus for performing the step bending process by providing the punched hole, wherein a length of a joint portion between the punched hole and the step bent part is made longer than the step bent part. A mold apparatus in which the diameter of the punched hole is about four times the width of the joint.
JP2000400457A 2000-12-28 2000-12-28 Mold equipment Expired - Fee Related JP3823726B2 (en)

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JP2004042122A (en) * 2002-07-15 2004-02-12 Press Kogyo Co Ltd Method and apparatus for molding to exceed elongation ratio of press mold
CN102284617A (en) * 2011-07-04 2011-12-21 无锡市中捷减震器有限公司 One-time forming die for processing plate
JP5878026B2 (en) * 2011-09-28 2016-03-08 盛岡セイコー工業株式会社 Pressed part and method for manufacturing pressed part
CN103611789A (en) * 2013-11-27 2014-03-05 梧州恒声电子科技有限公司 Front clamping plate fine blanking and blanking technology
CN104384342A (en) * 2014-11-27 2015-03-04 柳州市飞歌汽车配件有限公司 Spring seat plate forming die
CN108284150A (en) * 2017-12-30 2018-07-17 天津市维丹科技有限责任公司 A kind of metallic plate drilling aid
CN108555151A (en) * 2018-05-17 2018-09-21 贵州新双立科技有限公司 A kind of refrigerator bottom plate Bending Mould

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