JPS62234623A

JPS62234623A - Method and device for ironing drawing

Info

Publication number: JPS62234623A
Application number: JP61078464A
Authority: JP
Inventors: Kunio Miyauchi; 宮内　邦雄
Original assignee: RIKEN
Current assignee: RIKEN
Priority date: 1986-04-04
Filing date: 1986-04-04
Publication date: 1987-10-14
Anticipated expiration: 2010-12-13
Also published as: JPH07115089B2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】（産業上の利用分野）本発明はしごき絞り加工法および装置に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method and apparatus for ironing and drawing.

（従来の技術およびその問題点）通常のしごき絞りまたはしごき再絞り加工では、内側面
はポンチに押しつけられはするが、加工中に生じたヰＡ
斜の塑性変形が原因となる内側面の凸凹は取り除くこと
が出来ない。この凸凹は、ショックアブソバ−のような
内側面の寸法精度ばかりでなく、微小な凸凹も問題にな
る製品では、内側面の再研磨のような後加工が必要にな
る。これは生産性向」二の重大な障害になることが多い
。本発明は、高い生産性を実現し、なおかつ、コストダ
ウンも可能な生産方法とそのための装置を提供すること
を目ｒ白とする。(Prior art and its problems) In normal ironing or ironing and redrawing, the inner surface is pressed against the punch, but the
The unevenness of the inner surface caused by oblique plastic deformation cannot be removed. These irregularities require post-processing such as re-polishing of the inner surface in products such as shock absorbers where not only the dimensional accuracy of the inner surface but also minute irregularities are a problem. This is often a serious impediment to productivity. The present invention aims to provide a production method that achieves high productivity and also enables cost reduction, and an apparatus therefor.

（問題点を解決するだめの手段）一１１記目的は、被加工物体の側壁の外側面と内側面の
両側からしごき加工を行うことによって達成される。(Means for Solving the Problem) The object 111 is achieved by ironing from both the outer and inner surfaces of the side wall of the workpiece.

（発明の効果）本発明に従ってしぼり加工を行うと、内側面の寸法精度
が高く、後加工が必要とされず、生産性が向上しコスト
ダウンが可能となる。また、内側面に凹凸が存在する場
合、内圧のかかる製品ではこの微小な凸凹がクラック成
長の引き金に成り易く、この凹凸を無くずことは製品品
質を向」ニさせることになるが、本発明によればこの凹
凸を切削や研磨で削り落とすのではなく、加工硬化を伴
いながら、平滑化するた必、製品の強度をさらに上げろ
ことができる。これは製品の軽量化にもつながる。(Effects of the Invention) When the drawing process is performed according to the present invention, the dimensional accuracy of the inner surface is high, no post-processing is required, productivity is improved, and costs can be reduced. Furthermore, if there are irregularities on the inner surface, these minute irregularities can easily become a trigger for crack growth in products subject to internal pressure, and eliminating these irregularities will improve product quality. According to the authors, rather than removing these irregularities by cutting or polishing, it is necessary to smooth them out through work hardening, thereby further increasing the strength of the product. This also leads to lighter products.

（実施例）以下、本発明を、図面を参照しつつしごき再絞りを例に
とって説明する。(Example) Hereinafter, the present invention will be explained by taking ironing and re-drawing as an example with reference to the drawings.

既に深絞りされて筒状の容器６となったものを図に示す
ようにダイス５の」二にセットする。ポンチ１及び内側
面しごき工具２が一緒に落下し、容器６に接し、しごき
再絞りが始まる。ポンチが１゛の位置まで降りたとき、
しごき二「具２は２“の状態となり、支持工具３で落下
が止められ、以後この位置で容器側壁のしごきを安定し
て同一条件で行う。ポンチはなお進行を続け、１″の状
態になり、しごかれた容器６″を得て、加工を完了する
。The cylindrical container 6 that has already been deep drawn is set in the second part of the die 5 as shown in the figure. The punch 1 and the inner side ironing tool 2 fall together and come into contact with the container 6, and ironing and re-squeezing begins. When the punch descends to the 1゛ position,
The tool 2 is in the state of 2", its fall is stopped by the support tool 3, and from now on, the side wall of the container is stably rubbed in this position under the same conditions. The punch continues to advance until it reaches the 1" position, yielding a squeezed container 6" and completing the processing.

内側面しごき工具のしごき肩半径Ｒ“としごきダイスの
肩半径Ｒの大小関係を調整することにより側壁の残留応
力状態を変化させることが可能なので、目的に応じて両
者の大小関係を変え、希望の製品を作ることができる。It is possible to change the residual stress state of the side wall by adjusting the size relationship between the shoulder radius R of the inner side ironing tool and the shoulder radius R of the ironing die. products can be made.

本実施例において使用された装置は、その構造的特徴に
より、製品のポンチへの密着というトラブルが発生し難
いので潤滑油を内外どちらの面にも適用できる。これは
、製造方法に大きなフレキシビリティを与えるもので、
広い範囲に沿って本発明を適用することができる。Due to its structural features, the device used in this example is unlikely to cause problems such as the product adhering to the punch, so lubricating oil can be applied to both the inside and outside surfaces. This gives great flexibility in manufacturing methods.
The invention can be applied along a wide range.

[Brief explanation of drawings]

図は本発明を説明する平断面図。 ■、■”、１パ　　ポンチ、２．２’、２”　　・しごき工具、３　・・・支持工具、５・・　ダイス、６・・・・・容
器。The figure is a plan sectional view explaining the present invention. ■,■", 1 Pa punch, 2.2', 2" - Ironing tool, 3... Support tool, 5... Dice, 6... Container.

Claims

[Claims]

(1) A method of ironing and drawing in which ironing is performed from both the outer and inner surfaces of the workpiece.

(2) A die that has an opening and is provided around the opening with an outer contact portion having a curvature that contacts the outer surface of the workpiece, which passes through the opening of the die to push and pull the workpiece. a punch, an ironing tool slidably fitted to the punch and provided with an inner abutment portion having a curvature that abuts the inner surface of the workpiece, and a transition of the ironing tool performed together with the punch; An ironing and drawing processing device comprising a regulating means that regulates the inner abutting portion at a position opposite to the outer abutting portion via the workpiece.