折り目
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鉄の円盤の縁を折るには、端を全部折り上げなければならない
プレス加工は、材料の塑性次第です。
密封の要件はありますか？作成する構造はヘッドに似ているように思えます。このような構造は、一般的にプレス加工または旋圧によって作られる。
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