JPH07185704A - Method for working end face of flange of pan with fluororesin - Google Patents

Abstract

PURPOSE:To prevent flawing of a fluororesin surface and to improve the finish appearance without generating cut layers by subjecting a flange to pressing to a V shape from its both surfaces, then rupturing the V of both surfaces form each other, trimming the edges, pressuring a roll to the ruptured surfaces and plastically working the surface to an arc-shaped section. CONSTITUTION:Both of the front end angles of V parts 4a, 3a of an upper mold and a lower mold are specified to about 50 to 90 deg. and the flange part of a metallic pan 1 coated with the fluororesin is cut off at these parts. In such a case, the projecting angle parts of the flange 1a are slightly bulged by the V pressing but are molded to the arc shape by rolling. Then, the cut layers are not generated and, therefore, the flawing of the fluororesin surface by contact of the cut layers therewith does not arise any more and in addition, the need for treatment of the cut layers is eliminated and, therefore, the automation of the production stages is facilitated. The fluororesin is infiltrated to the plate thickness surface by the V pressing and, therefore, the product having the good finish appearance is obtd.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、内面にフッ素樹脂コー
ティングを施した金属鍋の製造方法の改良に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for manufacturing a metal pot having an inner surface coated with a fluororesin.

【０００２】[0002]

【従来の技術】従来、鍋のフランジ部はプレスによる剪
断加工により縁切りを行なった後、バイトによる切削加
工により端面を円弧状断面としていた。2. Description of the Related Art Conventionally, the flange portion of a pot has been cut off by a shearing process using a press, and then the end face has an arcuate cross section by a cutting process using a cutting tool.

【０００３】[0003]

【発明が解決しようとする課題】従来の切削加工による
方法では、切削屑が発生し、フランジのフッ素樹脂面に
切削屑が接触してキズが付き不良品を多発し、また切削
屑の発生は製造工程の自動化を困難にしていた。In the conventional method of cutting, cutting scraps are generated, and the scraps come into contact with the fluororesin surface of the flange to cause scratches, resulting in frequent defective products. It made it difficult to automate the manufacturing process.

【０００４】また、鍋は正確な真円でないため、回転切
削の場合円周位置によりフッ素樹脂の切れ目が一定でな
く、製品の外観も良くなかった。Further, since the pot is not an exact circle, the cut of the fluororesin is not constant depending on the circumferential position in the rotary cutting, and the appearance of the product is not good.

【０００５】[0005]

【課題を解決するための手段】この目的を達成するた
め、本発明では、フランジ両面よりＶ字状にプレス加工
した後、両面のＶの間を破断して縁落としを行なう。次
いで該破断面にロールを押し付けて製品を回転すること
により端面を円弧状断面に塑性加工を行なう。In order to achieve this object, in the present invention, after press working from both sides of the flange into a V shape, the V between the both sides is broken to trim the edges. Then, by pressing a roll against the fracture surface and rotating the product, the end face is plastically processed into an arc-shaped cross section.

【０００６】フランジ両面をＶ字状にプレス加工する際
に、製品側端面凸角部を圧縮加工するようにすることが
好ましい。When pressing both sides of the flange into a V shape, it is preferable that the convex corners of the end face on the product side are compressed.

【０００７】[0007]

【作用】切削加工がないので、切削屑の発生がなく、フ
ッ素樹脂面のキズが防止されるだけでなく、Ｖ字状加工
により板厚面にフッ素樹脂が廻り仕上がりの外観が良く
なる。Since there is no cutting work, no cutting dust is generated and scratches on the fluororesin surface are prevented, and the V-shaped work allows the fluororesin to rotate around the plate thickness surface, improving the appearance.

【０００８】フランジ両面をＶ字状にプレス加工する際
に、膨らみが発生する端面凸角部を圧縮加工を行なうこ
とにより、ロール加工を行なう面積が少なくなるほか、
フッ素樹脂面の割れや剥離の発生を防止することができ
る。When pressing both sides of the flange into a V-shape, by compressing the convex corners of the end face where bulges occur, the area to be rolled is reduced and
It is possible to prevent cracking or peeling of the fluororesin surface.

【０００９】[0009]

【実施例】以下、本発明の実施例を添付の図面に基いて
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.

【００１０】図１、図２、図３は本発明をアルミニウム
製鍋に実施した例を示す加工工程図であり、図１の
（Ａ）は加工前、（Ｂ）はＶ字状加工、図２は縁落と
し、図３はロール加工を示す。FIGS. 1, 2 and 3 are processing step diagrams showing an example in which the present invention is applied to an aluminum pot. FIG. 1 (A) is before processing, (B) is V-shaped processing, and FIG. 2 shows edge trimming, and FIG. 3 shows roll processing.

【００１１】本例では、Ｖの先端角は上下とも５０゜〜
９０゜とし、この部分でフッ素樹脂を切る。Ｖの先端角
をこれより鋭角にすると損耗が大きく、また鈍角にする
と喰込みが悪くなる。Ｖの高さはＶとＶが接触しない範
囲で間隙を極力小さく０.００２〜０.１０ｍｍとなるよ
うにする。この場合Ｖ字状プレス加工によりフランジの
端面凸角部に若干の膨らみが発生するが、図３のロール
加工により円弧状に成形する。In the present example, the tip angle of V is 50 ° both above and below.
90 ° and cut the fluororesin at this point. If the tip angle of V is more acute than this, the wear is large, and if it is obtuse, the biting becomes worse. The height of V is as small as possible within a range where V and V do not contact each other, and is set to 0.002 to 0.10 mm. In this case, a slight bulge is generated at the convex corner portion of the flange due to the V-shaped press working, but it is formed into an arc shape by the roll working shown in FIG.

【００１２】下型３のＶ部３ａと上型４のＶ部４ａとを
正確に対向させるため、下型３と上型４に遊隙の小さい
はめ合い部３ｂ、４ａ、及び面取り又はＲ部３ｃ、４ｃ
を設けて、正確な位置合せをする。同時にＶ部３ａ、４
ａの先端が接触することなく正確な位置で停止するよう
に３ｂと４ｂを当り止めとする。In order to make the V portion 3a of the lower die 3 and the V portion 4a of the upper die 4 exactly face each other, the lower die 3 and the upper die 4 have fitting portions 3b and 4a with a small play, and a chamfer or an R portion. 3c, 4c
For accurate alignment. At the same time, V parts 3a, 4
Stops 3b and 4b so that the tip of a stops at an accurate position without contact.

【００１３】図２に示される実施例では、Ｖ字状プレス
加工において端面凸角部を圧縮加工するようにしたもの
である。Ｖ字状プレス加工の段階で断面形状が円弧状断
面に近くなる。In the embodiment shown in FIG. 2, the convex corners of the end face are compressed in the V-shaped press working. At the stage of V-shaped press working, the cross-sectional shape becomes close to an arc-shaped cross section.

【００１４】先端角４０゜〜８０゜のＶの高さｈの０.
３〜０.６ｈの位置から両側１〜５ｈの範囲を広角のＶ
とした例を示すが、これを滑らかな曲線としてもよい。
広角のＶと組合せると先端部の高さが低くなるので先端
角は単独Ｖより鋭角にすることができる。The height h of V at the tip angle of 40 ° to 80 ° is 0.
Wide angle V from the position of 3 to 0.6h to both sides of 1 to 5h
However, this may be a smooth curve.
When combined with a wide-angle V, the height of the tip portion becomes low, so the tip angle can be made more acute than the single V.

【００１５】図５に示される実施例では、Ｖ字状プレス
加工において製品側端面凸角部のみを圧縮加工するよう
にし、縁落とし側の端面凸角部の金型には逃げを設けた
例である。In the embodiment shown in FIG. 5, in the V-shaped press working, only the product-side end surface convex corner portion is compressed, and a relief is provided in the die of the edge-cutting side end surface convex corner portion. Is.

【００１６】[0016]

【発明の効果】請求項１記載のフランジ端面加工方法を
用いれば、切削屑が発生しないのでフッ素樹脂面に切削
屑が接触してキズが付くことが無くなるだけでなく、切
削屑の処理が不要になるため製造工程の自動化が容易に
なる。When the flange end face processing method according to the first aspect is used, no cutting dust is generated, so that the cutting dust does not come into contact with the fluororesin surface to be scratched, and the processing of the cutting dust is unnecessary. Therefore, the automation of the manufacturing process becomes easy.

【００１７】Ｖ字状プレス加工により板厚面にフッ素樹
脂が廻るので、仕上り外観が良好な製品が得られる。Since the fluororesin is spread around the plate thickness by the V-shaped press working, a product having a good finished appearance can be obtained.

【００１８】切削加工或いはロール加工に加工時間を要
するのでこれがネック工程になることが多いが、請求項
２記載のフランジ端面加工法を用いれば、Ｖ字状プレス
加工の段階で断面形状が円弧状断面に近くなるので、ロ
ール加工の加工面積が少なくなり加工速度が向上する。Since a cutting process or a rolling process requires a processing time, this often becomes a neck process. However, if the flange end face processing method according to claim 2 is used, the cross-sectional shape is an arc shape at the stage of V-shaped press processing. Since it is close to the cross section, the processing area for roll processing is reduced and the processing speed is improved.

【００１９】製品側端面凸角部は、膨らみの発生後ロー
ル成形するとフッ素樹脂面が荒れて密着の低下や割れが
生じ易いが、膨らみが生じないように圧縮成形すること
により防止することができる。The convex corners on the product-side end surface are likely to cause a decrease in adhesion and cracking due to roughening of the fluororesin surface when roll molding is performed after bulging occurs, but can be prevented by compression molding so that bulging does not occur. .

【００２０】圧縮成形はプレスの加圧力の増加が必要に
なるが、縁落とし側の端面凸角部の金型に逃げを設ける
と不要なプレス加圧力の増加をなくす効果がある。In compression molding, it is necessary to increase the pressurizing force of the press, but providing a relief in the mold of the edge convex portion on the edge drop side has the effect of eliminating an unnecessary pressurizing force increase.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明のＶ字状加工の一実施例を示す説明図
で、（Ａ）は加工前、（Ｂ）はＶ字状加工示す。FIG. 1 is an explanatory view showing an embodiment of a V-shaped processing of the present invention, (A) shows before processing, and (B) shows V-shaped processing.

【図２】本発明の工程中の縁落とし示す説明図である。FIG. 2 is an explanatory diagram showing edge trimming during the process of the present invention.

【図３】本発明の工程中のロール加工を示す説明図であ
る。FIG. 3 is an explanatory view showing roll processing during the process of the present invention.

【図４】本発明のＶ字状加工のほかの実施例を示す説明
図である。FIG. 4 is an explanatory view showing another embodiment of V-shaped processing according to the present invention.

【図５】本発明のＶ字状加工のほかの実施例を示す説明
図である。FIG. 5 is an explanatory view showing another embodiment of V-shaped processing according to the present invention.

【図６】製品の一例の断面図である。FIG. 6 is a cross-sectional view of an example of a product.

【図７】従来の加工方法を示す工程図で（Ａ）は加工
前、（Ｂ）は剪断加工、（Ｃ）は切削加工を示す説明図
である。7A and 7B are process diagrams showing a conventional processing method, FIG. 7A is an explanatory view showing a state before processing, FIG. 7B is a shearing process, and FIG.

【符号の説明】 １ 金属鍋 １ａ 金属鍋のフランジ部 ２ 縁屑 ３ 下型 ３ａ 下型Ｖ部 ３ｂ 下型のはめ合い部 ３ｃ 下型面取り又はＲ部 ４ 上型 ４ａ 上型Ｖ部 ４ｂ 上型はめ合い部 ４ｃ 上型面取り又はＲ部 ５ ロール ６ 切削バイト[Explanation of symbols] 1 metal pan 1a flange part of metal pan 2 edge scrap 3 lower mold 3a lower mold V part 3b lower mold fitting part 3c lower mold chamfer or R part 4 upper mold 4a upper mold V part 4b upper mold Fitting part 4c Upper chamfer or R part 5 Roll 6 Cutting tool

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 フッ素樹脂付き金属鍋のフランジを切断
・成形する加工において、フランジ両面よりＶ字状にプ
レス加工した後、両面のＶの間を破断して縁落としを行
ない、該破断面にロールを押し付けて円弧状断面に塑性
加工を行なうフランジ端面加工法。1. In the process of cutting and forming a flange of a metal pot with a fluororesin, after press-working from both sides of the flange into a V shape, the V on both sides is broken to trim the edges, A flange end face processing method that presses a roll to perform plastic working on an arcuate cross section. 【請求項２】 フランジ両面をＶ字状にプレス加工する
際に、製品側端面凸角部を圧縮加工するようにしたこと
を特徴とする請求項１記載のフランジ端面加工法。2. The method for processing a flange end surface according to claim 1, wherein when the both surfaces of the flange are pressed into a V shape, the convex corners on the product side end surface are compressed.