JP2001505132A - Method of manufacturing a can having a polygonal cross section and a can having a polygonal cross section - Google Patents

Abstract

(57) Abstract: A method of manufacturing a can having a polygonal cross section and a can having a polygonal cross section, wherein the cylinder is continuous, axially spaced from one another, and has a tubular body (10). Milling the cylindrical sidewall of the tubular body (10) to provide the wall with a plurality of circumferential ribs (20) defined by a required degree of plastic deformation in each circumferential region of the tubular sidewall. Expanding the formed tubular body (10) and deforming the tubular body to define a longitudinal edge (12) where the circumferential rib (20) is to be removed; and a bottom wall of the can. And double winding the upper wall around the tubular body (10). The method defines a can having any polygonal cross-section and having circumferential ribs (20) on sidewalls between longitudinal edges (12).

Description

DETAILED DESCRIPTION OF THE INVENTION                    Method for producing cans with polygonal cross section                        And cans with polygonal cross section Field of the invention   The present invention relates to a polygonal, usually rectangular section having a tubular body with longitudinal transverse seams. The invention relates to a method for producing a can having a surface. Background of the Invention   The metal plate is cut, and the metal plate is calendered into a cylindrical tubular body. Cylindrical shape obtained by conventional work of welding a metal plate vertically to close the body sideways A can having a tubular body is known.   Axially spaced from each other to increase the structural strength of the side walls of the can body A predetermined number of ribs that protrude slightly inward from the can body and reinforce in the circumferential direction In many cases, the can body is usually processed with a milling machine to provide .   The rib is obtained by deforming the cylindrical side wall of the can body, and the structural strength in the radial direction of the can is obtained. Is increased, and as a result, Thinner metal plates can be used, and thus the cost of the final product can be reduced appropriately.   Still, without interruption and without axially weakening the structure of the can, the ribs Only when applying the solution of the above configuration to a cylindrical can that is deployed in the circumferential direction Economically and industrially viable. For cylindrical cans, continuous circumference By providing a directional rib, the normal function (operation) of the can is impaired There is no reduction in the structural strength of the can to the axial compression force. Therefore, the supplement The provision of the strong ribs can compensate for a decrease in the thickness of the metal plate.   However, in the case of cans having a polygonal cross section, more specifically, For cans with rounded longitudinal edges, the wall can withstand radial forces. In order to increase the thickness and correspondingly reduce the thickness of the metal plate, The provision of reinforced circumferential ribs significantly reduces the resistance to axial compressive forces. The ribs weaken the longitudinal edges of the cans, impairing the function of the cans, and are not considered to be convenient. It has not been done. With a continuous circumferential rib, it has a square cross section. For attempts to compensate for the reduced thickness of the metal plate of the can, see the longitudinal edge of the can. , Satisfactory results have not been obtained due to the degree of weakness occurring in   However, the interruption of the circumferential ribs in the region of the longitudinal edges of the can, Fairly complex which will cause undesirable wrinkles in the end areas of each part The work requires that the ribs be made only on the side wall portions. these Due to inconvenience, canisters with a polygonal, usually rectangular cross section, have circumferential reinforcing ribs However, it was not possible to compensate for the reduction in the thickness of the metal plate. Disclosure of the invention   An object of the present invention is to provide a circumferential reinforcing rib on the side wall of the can by a simple operation, No weakness at the vertical edge and reduced thickness of the metal plate forming the side wall of the can A method for producing cans having a polygonal, usually rectangular cross-section To provide.   Another object of the present invention is to provide a can having a polygonal cross section, wherein the can The tubular body is provided with circumferential reinforcing ribs interrupted at the longitudinal edges of the can. ing.   The method for producing cans having a polygonal cross-section involves longitudinal seaming. Forming an initial step of forming a tubular body with a cylindrical side wall with seams from a metal plate Be prepared.   According to the present invention, the manufacturing method comprises:   Continuous, axially spaced from each other, the cylindrical side wall of the tubular body Multiple circumferences defined by the required degree of plastic deformation in each circumferential area Milling the cylindrical side wall of the tubular body to provide a directional rib on said wall When,   The area where the tubular body of the can is expanded to the desired polygonal cross-section and the circumferential ribs are removed Deforming its sidewalls to define a longitudinal edge;   Double winding the bottom and top walls of the can into a tubular body of polygonal cross section; Is further provided.   According to this novel method, the steps of forming the can body are simple and complex. No treatment or process is required, and up to the point where the tubular body of the can is closed Is the same as the process used for However, from this point, the polygonal cross section The steps for forming a can with are different from those known. And a tubular body During the step of forming the tubular body from the original cylindrical shape to the desired polygonal tubular shape Removed from the longitudinal edge of the can A continuous circumferential rib is provided.   The degree of deformation of the side wall to form the rib expands the tubular body into a polygonal shape After the step, maintain the structural integrity of the struts defined by the longitudinal edges While the ribs are effectively removed from the area of the longitudinal edges of the can, the ribs The structure of these side wall portions is maintained along each side wall portion of the tubular body having a polygonal shape. Increases yield strength and substantially reduces metal sheet thickness without compromising can structure Determined to be able to. BRIEF DESCRIPTION OF THE FIGURES   The present invention will be described below with reference to the accompanying drawings.   FIG. 1 shows a partially cut oblique view of a can having a square cross section, with a circumferential rib according to the invention. FIG.   FIG. 2 shows an enlarged partial longitudinal sectional view of a side wall portion of the can of FIG. 1, showing possible rib cross sections. You.   FIG. 3 is an enlarged partial longitudinal sectional view of a longitudinal edge of the can of FIG. Indicates that the circumferential rib is deformed in the opposite direction.   FIG. 4 is an enlarged cross-sectional view of the can of FIG. 1 taken along a rib extension of a side wall portion of the can. The rib outline in the area of the vertical edge Indicates a change. BEST MODE FOR CARRYING OUT THE INVENTION   As shown in FIG. 1, an object of the present invention is to provide a can having a polygonal cross section, usually a square cross section. It is intended to be applied to the production of 9 liter cans having   In this method, after calendering, the perimeter of the polygonal cross section of the Dimensions calculated to form a cylindrical tubular body 10 of approximately equal circumference To form a tubular body, such as a step of cutting a metal plate of a predetermined thickness with a method Known steps are required. The lateral (lateral) closure of the tubular body 10 is usually The edges of the metal plates that have been processed are welded to each other in the vertical (longitudinal) direction. It is obtained by forming seams 11.   According to the method proposed herein, the cylindrical shape as shown in FIGS. The side walls are deformed in the circumferential and radial directions and are continuous along the entire circumference. The calender still comprises a plurality of circumferential ribs 20 projecting radially inside the Milling a processed cylindrical body 10 having a known suitable structure Work (mill) with a machine (not shown).   The degree of deformation of the side wall of the tubular body 10 allows a reduction in the thickness of the metal plate to about 15%. It is determined to increase the structural strength of the radial side wall while doing so.   Appropriate devices (FIG. 1) are provided to prevent the ribs 20 from weakening the longitudinal edges 12 of the can. (Not shown) during the step of expanding the tubular body 10 to the desired polygonal cross-sectional shape. The ribs are removed in the region of the edge. The step of expanding the tubular body 10 In the step, the radius added to form the arcuate (curved) longitudinal edge 12 The directional force is sufficient to deform the rib 20 in these areas in the opposite direction. Thus, in effect, the structural effects on the struts defined by the longitudinal edges 12 Remove the rib from the point.   Therefore, without changing the profile of the side wall in the area of the edge, the central part of the side wall Only the longitudinal ribs 20 can be provided.   After expansion of the tubular body 10, the bottom and top walls of the can are turned into a tubular body 10 of polygonal cross section. Perform the step of double seaming.   This new method has a polygonal cross section and the metal plate thickness is relatively reduced. On a plane that crosses the axis of the can And obtained by radial deformation of the side wall of the tubular body, and in the axial direction Removed in the area of the longitudinal edge of the can to maintain the structural integrity of the edge A can that is structurally reinforced by circumferential ribs can be obtained.   In the illustrated embodiment, the circumferential rib 20 has a rounded V-section. Only While ignoring the desired radial reinforcing function, It should be understood that certain changes can be made.

Claims (1)

[Claims] 1. A tubular body (10) having a cylindrical side wall with longitudinal seams (11) is made of metal For producing cans having a polygonal cross section, comprising an initial step of forming from a plate Method,   Continuous, axially spaced apart cylinders of a tubular body (10) Defined by the required degree of plastic deformation in the radial direction in each circumferential region of the A cylindrical side wall of the tubular body (10) for providing a number of circumferential ribs (20) on said wall; Milling the   The can tubular body (10) is expanded to the desired polygonal cross-section and the circumferential ribs (20) are removed. Deforming its side walls to define the longitudinal edge (12), the area to be removed Steps and   Double winding the bottom and top walls of the can into a tubular body of polygonal cross section; A method comprising: 2. Radial deformation of the cylindrical side wall (10) to form the circumferential rib (20) Is generated from the outside of the can to the inside of the can. Method. 3. Arc-shaped vertical edges (12) and vertical seams (11) Tubular body formed by a side wall portion defined by a single metal plate comprising Can having a polygonal cross-section, defined between the longitudinal edges (12) arcuate surfaces of the can Of each circumferential rib (2) disposed on a plurality of planes transverse to the axis of the can. 0) wherein the ribs are axially spaced from one another Both cans are formed by radial deformation of the side wall portion of the tubular body. 4. Circumferential ribs (20) radially deforming the can from outside to inside The can according to claim 3, wherein the can is formed by: