公开(公告)号：US20030046971A1

公开(公告)日：2003-03-13

申请号：US10230139

申请日：2002-08-29

Applicant: DAIWA CAN COMPANY

Inventor： Yasushi Enoki

IPC: B21D022/21

CPC classification number: B21D22/30 ,  B21D51/26

Abstract: A bottle-shaped can manufacturing method for forming a shoulder portion having a slope and a diametrically small cylindrical neck portion integrally by further working a bottom side of a bottomed cylindrical can which is formed thinner at its trunk wall than at its bottom wall by drawing a metallic sheet having a thickness of 0.1 to 0.4 mm and by executing at least one thinning working of a bending/extending working and an ironing working. This method comprises: a first diametrically small cylindrical portion forming step of drawing the bottom and the trunk of the can into a diametrically smaller bottomed cylindrical shape than the trunk portion, and forming a bottom corner portion of the can into a curved face (or a curved shoulder face) having an arcuate longitudinal section, with the curved face of the bottom corner portion and the curved face being unwrinkled; a second diametrically small cylindrical portion forming step of re-drawing the bottomed cylindrical portion drawn into a diametrically smaller bottomed cylindrical shape at the previous step, with the bottom corner portion being unwrinkled by the surface of a tool; and a shoulder portion reforming step of pushing and extending the shoulder portion, which is formed by the first diametrically small cylindrical portion forming step and the second diametrically small cylindrical portion forming step into a smooth slope leading to the curved shoulder face on the trunk side, after the diameter of the bottomed cylindrical portion formed by executing the drawing working of the second diametrically small cylindrical portion forming step once or two or more times becomes substantially equal to a diameter of the neck portion.

Abstract translation: 一种瓶形罐制造方法，用于通过进一步加工有底圆柱形罐的底侧而形成具有斜面和径向小的圆柱形颈部的肩部，所述底部圆柱形罐的底侧在其主干壁处比通过拉伸 通过执行弯曲/延伸加工和熨烫加工的至少一个减薄加工，具有厚度为0.1〜0.4mm的金属板。 该方法包括：第一直径较小的圆筒形部分形成步骤，其将罐的底部和躯干拉伸成比主干部分直径较小的有底圆柱形，并且将罐的底角部分形成为曲面（或 弯曲的肩面）具有弓形的纵向截面，底角部分的弯曲面和曲面被打皱; 第二直径较小的圆柱形部分形成步骤，在前一步骤中重新拉伸有底圆柱形部分，其被拉伸成直径较小的有底圆柱形，底部拐角部分被工具的表面打皱; 以及肩部重整工序，其通过第一直径小的圆筒部形成工序和第二径向小的圆筒部形成工序形成为将肩部延伸到通向躯干侧的弯曲的肩部的平滑的斜面上的肩部， 在通过执行第二直径小的圆筒形部分形成步骤的拉伸加工形成的有底圆筒部分的直径一次或两次或更多次之后，基本上等于颈部的直径。