JPS59220227A - Forming method of thin plate - Google Patents
Forming method of thin plateInfo
- Publication number
- JPS59220227A JPS59220227A JP58097137A JP9713783A JPS59220227A JP S59220227 A JPS59220227 A JP S59220227A JP 58097137 A JP58097137 A JP 58097137A JP 9713783 A JP9713783 A JP 9713783A JP S59220227 A JPS59220227 A JP S59220227A
- Authority
- JP
- Japan
- Prior art keywords
- thin plate
- molded product
- product
- punch
- formed product
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 10
- 230000037303 wrinkles Effects 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 14
- 238000000465 moulding Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は薄板の成形方法に関し、特に成形品の寸法精
度の向上を目的としたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a thin plate, and is particularly aimed at improving the dimensional accuracy of a molded product.
一般に材料を変形させて成形する加工は、材料の塑性変
形を利用するものであるが、完全な塑性体としての材料
はなく、程度の差こそあれ必ず弾性を有し、成形後にも
弾性が残存することから外力を除いたときにいわゆるス
プリングバック現象が起き、これが成形品の寸法精度の
悪化、形状不良等の原因になっている
このスプリングバック現象は、板厚が薄い程、又変形抵
抗が大きく、弾性係数が小さい材料程大きく、例えば薄
板の角筒絞り加工による成形品は第１図に示すように、
部分的にスプリングバックを起こし所定の形状・寸法が
得られない。つまり同図（イ）に示すように直辺部にお
いて所定の位１６から角度（のだけスプリングバックを
生じ、角部はスプリングバックが発生していない。こＩ
／Ｊように角筒絞り加工においては、通常直辺部（イ）
の付近は単純な曲げによる引張り応力が主であり、加工
度が小さいために弾性の残存割合が多く、逆に脚部（ロ
）の付近は圧縮応力と引帰り応力が入り交って生ずる大
きな加工度となり、弾性の残存割合が少ない。Processing that deforms and forms materials generally utilizes the plastic deformation of the material, but no material is a perfect plastic body; it always has elasticity to varying degrees, and elasticity remains even after forming. Therefore, when the external force is removed, a so-called springback phenomenon occurs, which causes deterioration of dimensional accuracy and shape defects of molded products. The larger the material and the smaller the elastic modulus, the larger the material.For example, a molded product made by drawing a thin plate into a rectangular cylinder is shown in Figure 1.
Partial springback occurs, making it impossible to obtain the desired shape and dimensions. In other words, as shown in the same figure (A), springback occurs at a predetermined angle (16) at the right side, and no springback occurs at the corner.
/J In square tube drawing, usually the right side part (A)
In the vicinity of the leg (b), the tensile stress is mainly due to simple bending, and the degree of working is small, so there is a large proportion of remaining elasticity.On the contrary, in the vicinity of the leg (b), there is a large stress caused by a mixture of compressive stress and return stress. The degree of processing is low, and the remaining elasticity is low.
したがって成形品のスプリングバックは加工度に依存す
るといえる。Therefore, it can be said that the springback of a molded product depends on the degree of processing.
このようにスプリングバックを防止する従来法の一例と
して、第２図に示すような角筒絞りの成形方法があった
。すなわち同図において、（１）は成形型、（Ｌａ）は
成形型］１）の中央部に設けた四角状の孔、（１ｂ）は
孔（Ｉａ）の底面、（Ｌｃ）は上記成形型１１）の上面
に形成された平面、（２）は成形型（１）の平面（ｌｏ
）に支持される被成形薄板、（２ａ）は成形品、（８）
は被成形薄板（２）の周縁部を押圧するしわ押え具１．
（８ａ）はしわ押え具（３）の中央部に設けられた四角
状の貫通孔、（４）は上記しわ押え具（８）の貫通孔（
８ａ）に案内される四角状の成形ポンチ、（４１）は成
形ポンチ（４）の下端面の角部に形成した凸状のビード
、（５）は上記成形ポンチ（４）を昇降及び押圧させる
図示しない他の加圧装置によって作動される主加圧ラム
、（６）は上記しわ押え具ｌ１１）を昇降及び押圧させ
る図示しない他の加圧ｇ置によって作動される副加圧ラ
ム、（γ）は成形型ｆ１）の支持台である。As an example of a conventional method for preventing springback in this way, there is a rectangular tube drawing method as shown in FIG. That is, in the same figure, (1) is the mold, (La) is the square hole provided in the center of the mold 1), (1b) is the bottom of the hole (Ia), and (Lc) is the mold. 11) is a plane formed on the upper surface, (2) is a plane formed on the upper surface of the mold (1) (lo
), (2a) is the molded product, (8)
1. is a wrinkle presser that presses the peripheral edge of the thin plate (2) to be formed.
(8a) is a square through hole provided in the center of the wrinkle presser (3), and (4) is a through hole (4) of the wrinkle presser (8).
A square forming punch guided by 8a), (41) a convex bead formed at the corner of the lower end surface of the forming punch (4), and (5) lifting and pressing the forming punch (4). The main pressurizing ram (6) is operated by another pressurizing device (not shown), and the auxiliary pressurizing ram (γ ) is a support for the mold f1).
以上のように構成された第２図において、被成形薄板（
２）の周縁は、成形型（１）の平向部（ｌｅ）としわ押
え具（８）を介して副加圧ラム（６）によってしわが生
じないような適度なしわ押え圧力が加えられる。In FIG. 2 configured as above, the thin plate to be formed (
Appropriate wrinkle-pressing pressure to prevent wrinkles from forming is applied to the peripheral edge of 2) by the auxiliary pressure ram (6) via the flat part (le) of the mold (1) and the wrinkle-pressing device (8). .
次いで成形ポンチ（４）を介した主加圧ラム（６）によ
って成形型（１）の孔（１ａ）の下方向に向って絞り込
まれる。そして加工終期においては第２図（ｂ）に示す
ように、成形品（２ａ）の底部内面は成形ポンチ（４）
のビード（４ｔＬ）と成形型（１）の内底部（Ｌｂ）と
の間で圧印される。したがって成形品（２ａ）の底部内
面は局部的に大きな加工度となり、成形品（２ａ）を取
り出した後のスプリングバックが少なくなるものである
。Next, the hole (1a) of the mold (1) is squeezed downward by the main pressure ram (6) via the mold punch (4). At the final stage of processing, as shown in Figure 2(b), the bottom inner surface of the molded product (2a) is pressed against the molding punch (4).
is coined between the bead (4tL) and the inner bottom (Lb) of the mold (1). Therefore, the inner surface of the bottom part of the molded product (2a) has a locally large degree of processing, and the springback after the molded product (2a) is taken out is reduced.
しかし被成形材料が極く薄い板材であったり、又変形抵
抗の大きな板材である場合には圧印加工が不可能になる
ことと、仮に圧印できたとしても成形品（２ａ）の底部
内面の一部が圧印加工のため薄くなることから、成形品
の強度及び意匠的な面で問題を残す等の欠点をもってい
る。However, if the material to be formed is an extremely thin plate material or a plate material with high deformation resistance, the coining process will be impossible, and even if coining is possible, the bottom inner surface of the molded product (2a) will be damaged. Since the part becomes thin due to the coining process, it has drawbacks such as problems in terms of strength and design of the molded product.
この発明は上記のような従来の加工法の欠点を除去する
ものである。すなわちこの発明は、角筒絞り加工の終期
において成形品のスプリングバックの起こる直辺部のみ
を側方がら押圧して内側へ向って曲げておき、成形品を
取り出した後スプリングバックにより所定の形状に戻す
ことを特徴とするものであり、以下その一実施例を示す
第８図〜第５図について説明する。The present invention eliminates the drawbacks of conventional processing methods as described above. In other words, in the present invention, in the final stage of rectangular tube drawing, only the right sides of the molded product where springback occurs are pressed from the sides and bent inward, and after the molded product is taken out, the springback causes the molded product to be shaped into a predetermined shape. 8 to 5 showing one embodiment thereof will be described below.
図において、（Ｌａ）は成形型（１）の孔（１ａ）の４
面の所定の位置に形成した溝、（４ｂ）は成形ポンチ（
４）の４面の所定の位置に形成した凹欠部、（８）は晟
形型（１）の上記溝（ｌａ）に嵌合した押し具であり、
これは図示していない他の加圧装置によって作動される
加工ラム（９）Ｋそれぞれ直結され、孔（Ｌａ）に対し
て出入動作するようＫなっている。In the figure, (La) is the hole (1a) of the mold (1).
The grooves (4b) formed at predetermined positions on the surface are formed using a forming punch (
4) recessed notches formed at predetermined positions on the four sides; (8) is a pusher fitted into the groove (la) of the square shape (1);
These machining rams (9) K are directly connected to each other and are operated by other pressurizing devices (not shown), and are adapted to move in and out of the hole (La).
ところで成形品（２ａ）は第８図に示すように、被成形
薄板（２）の周縁を平面部（（Ｃ）としわ押え具（８）
によって適度なしわ押え圧力が加えられた状態で成形ポ
ンチ（４）によって絞り込まれる。そして上記絞り加工
が終了した時点で第４図に示すように、成形品（２ａ）
の直辺＆ｌ（４面は押し具（８）を介する加圧ラム（９
）によって内側へ曲げ加工される。この曲げ量は、成形
品（２ａ）を取り出した後のスプリングバックによって
所定の形状に戻る分量に応じて決定されるものである。By the way, as shown in FIG. 8, the molded product (2a) has a flat part ((C) and a wrinkle presser (8) on the periphery of the thin plate to be molded (2).
The material is squeezed with a forming punch (4) while applying a suitable wrinkle pressing pressure. When the above-mentioned drawing process is completed, the molded product (2a) is formed as shown in Fig. 4.
The right side &l (the 4th side is the pressurizing ram (9
) is bent inward. The amount of bending is determined according to the amount by which the molded product (2a) returns to a predetermined shape due to springback after being taken out.
次いで第５図に示すように、加工ラム（９）を後退させ
押し具（８）を溝（［ｄ）内へ収納した後、しわ押え具
１３）を上昇させ、更に成形ポンチ（４）を主加圧ラム
（６）によって上昇させる。そして成形品（２ａ）の取
り外し工稈に入るが、ここで成形品（２ａ）の直辺部は
スプリングバックによって所定の形状に戻っているので
容易に取り外される。Next, as shown in FIG. 5, after the processing ram (9) is moved back and the pusher (8) is stored in the groove (d), the crease presser 13) is raised, and the forming punch (4) is moved up. It is raised by the main pressure ram (6). The molded product (2a) is then removed, but since the right side of the molded product (2a) has returned to its predetermined shape due to springback, it can be easily removed.
なお、以上の実施例では成形型を固定して成形ポンチを
移動させる構造を示しているが、成形ポンチを固定し、
成形型としわ押え具を連動して移動させるという形式の
絞り加工装置を採用してもよく、又押し具（８）の作動
は、加圧ラムに代るカムスライド機溝を用いる等の変更
は自由であり、更に角筒絞り加工に限定されない。In addition, although the above embodiment shows a structure in which the mold is fixed and the molding punch is moved, it is possible to fix the molding punch and move the molding punch.
A drawing device in which the mold and wrinkle presser are moved in conjunction with each other may be adopted, and the operation of the presser (8) may be changed by using a cam slide machine groove instead of a pressurizing ram. is free, and is not limited to rectangular cylinder drawing.
以上のようにこの発明によれば、加工終期において成形
品のスプリングバックの起る直辺部を側方から押圧し内
側へ曲げ加工を行ない、成形品取り出し後所ｒ・〕形状
に戻すものであり、被成形材料が極く薄い板材や変形抵
抗の大きな板材であっても簡単な操作によって寸法精度
の良い成形品を提供することができる。更にスプリング
バックの調整は、上記他方からの曲げ加工量によって適
量性なうことができるため、成形品の板厚や材質に変更
があっても同−型で対応できる。As described above, according to the present invention, at the final stage of processing, the right side part of the molded product where springback occurs is pressed from the side and bent inward, and after the molded product is taken out, it returns to the shape. Even if the material to be molded is an extremely thin plate material or a plate material with high deformation resistance, a molded product with good dimensional accuracy can be provided by simple operations. Furthermore, since the springback can be adjusted appropriately by the amount of bending from the other side, even if the plate thickness or material of the molded product is changed, it can be handled with the same mold.
第１図（ａ）は一般的に薄板材を角筒絞り加工した場合
のスプリングバックによる変形を示した平面図、同図（
ｂ）は同図ｂ−ｂ断面図、第２図（ＦＬ）は加工中期の
状態を示す縦断面図、同図中）は加工終期の状態を示す
縦断面図、第３図〜第５図はこの発明の一実施例を示し
、第８図は絞り加工終期の状態を示す縦断面図、第４図
は直辺部側面の曲げｊＪＯ工状工状水す縦断面図、第５
図は成形品を取り出した状態を示す縦断面図である。
図中、（１）は成形型、（Ｌａ）は孔、（Ｌｏ）は平面
、（１ｄ）は溝、（２）は被成形薄板、（２ａ）は成形
品、（８）はしわ押え具、（８ａ）は貫通孔、（４）は
成形ポンチ、（４１））は凹欠部、（８）は押し具であ
る。
尚、図中同一符号は同−又は相当部分を示す。
代地へ 大 岩 増 雄
第７３１４
第４図
第５図
手続補正書（自発）
ｈ′許庁長官殿
１、事件の表示 特願昭５８−９７１８７号２、発
明ノ名称 薄板の成形方法
３、補正をする者
名 称 （６０１）三菱電機株式会社代表者片山仁八
部
４、代理人
５、補正の対象
明細書の発明の詳細な説明の樒
６、補正の内容
明細書第２頁第１０行に「脚部（ロ）」とあるのを「角
部（ロ）」に訂正する。
以 七Figure 1(a) is a plan view showing the deformation caused by springback when a thin plate material is generally drawn into a rectangular tube.
b) is a cross-sectional view taken along line b-b in the same figure, Figure 2 (FL) is a vertical cross-sectional view showing the state in the middle stage of machining, Figure 2 (FL) is a vertical cross-sectional view showing the state in the final stage of machining, and Figures 3 to 5 8 shows an embodiment of the present invention, FIG. 8 is a longitudinal sectional view showing the state at the end of drawing process, FIG.
The figure is a longitudinal sectional view showing the molded product taken out. In the figure, (1) is the mold, (La) is the hole, (Lo) is the plane, (1d) is the groove, (2) is the thin plate to be formed, (2a) is the molded product, and (8) is the wrinkle presser. , (8a) is a through hole, (4) is a forming punch, (41)) is a recessed notch, and (8) is a push tool. Note that the same reference numerals in the figures indicate the same or corresponding parts. To the substitute land Masuo Oiwa No. 7314 Figure 4 Figure 5 Procedural amendment (voluntary) h' To the Commissioner of the Office of Public Affairs 1, Indication of the case Patent Application No. 1987-97187 2, Title of invention Method for forming thin plates 3, Name of the person making the amendment Name (601) Mitsubishi Electric Co., Ltd. Representative Hitoshi Katayama 4, Agent 5, Detailed explanation of the invention in the specification to be amended 6, Description of the contents of the amendment, page 2, 10 Correct the line ``leg (b)'' to ``corner (b)''. seven
Claims (1)
辺部を側方から押圧して所定量内側へ曲げておき、成形
品取出し後スブリンパックにより上記所定の形状に戻す
ことを特徴とする薄板の成形方法。In the final process of drawing a rectangular cylindrical product, etc., the right side of the shaped product is pressed from the side to bend it inward by a predetermined amount, and after the molded product is taken out, it is returned to the predetermined shape using a shrink pack. A thin plate forming method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58097137A JPS59220227A (en) | 1983-05-30 | 1983-05-30 | Forming method of thin plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58097137A JPS59220227A (en) | 1983-05-30 | 1983-05-30 | Forming method of thin plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59220227A true JPS59220227A (en) | 1984-12-11 |
Family
ID=14184178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58097137A Pending JPS59220227A (en) | 1983-05-30 | 1983-05-30 | Forming method of thin plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59220227A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009101378A (en) * | 2007-10-23 | 2009-05-14 | Aisin Takaoka Ltd | Pressing device for die quenching technique |
| JP2010017729A (en) * | 2008-07-08 | 2010-01-28 | Ntn Corp | Die device for forging outside joint member and method of manufacturing outside joint member |
| EP2845662A1 (en) * | 2013-09-04 | 2015-03-11 | Ford Otomotiv Sanayi Anonim Sirketi | Pressing method, press, profile and vehicle |
| CN110475624A (en) * | 2017-03-28 | 2019-11-19 | 杰富意钢铁株式会社 | The manufacturing method of press molding equipment and stamping product |
-
1983
- 1983-05-30 JP JP58097137A patent/JPS59220227A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009101378A (en) * | 2007-10-23 | 2009-05-14 | Aisin Takaoka Ltd | Pressing device for die quenching technique |
| JP2010017729A (en) * | 2008-07-08 | 2010-01-28 | Ntn Corp | Die device for forging outside joint member and method of manufacturing outside joint member |
| EP2845662A1 (en) * | 2013-09-04 | 2015-03-11 | Ford Otomotiv Sanayi Anonim Sirketi | Pressing method, press, profile and vehicle |
| CN110475624A (en) * | 2017-03-28 | 2019-11-19 | 杰富意钢铁株式会社 | The manufacturing method of press molding equipment and stamping product |
| US11135634B2 (en) | 2017-03-28 | 2021-10-05 | Jfe Steel Corporation | Press forming device and method for producing press-formed articles |
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