JP4629561B2 - Drum can and manufacturing method thereof - Google Patents

Description

  The present invention relates to a drum can and a manufacturing method thereof.

  A drum can is used for containers of various substances, and after use once, the inner surface side of the drum can is often washed to be used as a container of the same or different substances. In such a case, if the previous contents remain after washing, the quality of the next contents is affected. Therefore, it is preferable to have a structure in which no residue remains as much as possible.

  As shown in FIG. 6, the normal drum can has a structure in which the lower end portion of the body plate 1, the bottom plate 2, and the cylindrical side wall portion 5 subsequent thereto are tightened by a tightening portion 6 to prevent leakage of contents. In addition, the welding portion 3 is provided at a position close to the base portion of the bent portion 8. For this reason, a wedge-shaped space 7 is formed over the entire circumference between the trunk plate 1 and the bent portion 8.

  If there is such a wedge-shaped space 7 inside the drum, foreign matter and solution enter and are trapped, so the inner surface of the drum can not be cleaned sufficiently and corrodes over a long period of time. There is a problem that things may leak out.

  As a method for solving these problems, Patent Document 1 discloses, as shown in FIG. 7, an annular shape along the upper edge (curved portion 8) of the cylindrical side wall portion 5 of the bottom plate 2 at a portion near the lower end of the body plate 1. A drum can is disclosed in which an inward convex portion 22 is provided, and a tip end portion of the annular inward convex portion 22 and a peripheral edge portion of the bottom plate 2 are fillet welded over the entire circumference to fill the wedge-shaped space 7. Yes.

  In Patent Document 2, as shown in FIG. 8, the bent portion 8 of the bottom plate 2 facing the wedge-shaped space 7 inside the drum can and the body plate 1 are melted from the outside of the drum can by laser welding 24, and the molten metals are fused. A method of filling the wedge-shaped space 7 to form the welded wall 23 is disclosed.

In Patent Document 3, as shown in FIG. 9, a short cylindrical joint 1 </ b> A that is reduced in diameter from the intermediate portion 1 </ b> B and is in contact with the outer surface side of the peripheral portion 2 </ b> A following the bottom plate 2 is provided at the lower end of the body plate 1. A drum can is disclosed in which the joint 1A and the peripheral portion 2A following the bottom plate 2 are welded from the outside of the container (W is a weld) at the reduced diameter base of the joint 1A.
Japanese Utility Model Publication No. 58-26896 JP-A-5-69166 JP-A-5-319433

  In the technique of Patent Document 1, fillet welding is performed over the entire circumference from the inner surface side of the drum can to the contact portion between the body plate 1 and the bottom plate 2 to fill the wedge-shaped space 7, so there is an advantage that no residue remains. When manufacturing a drum can, welding slag is scattered on the inner surface side of the drum can in the welding operation, and the slag adheres to the bottom and body of the drum can and contaminates the inner surface side of the drum can. There is a problem that it takes time and effort. Further, since it is necessary to weld the entire circumference from the inner surface side of the drum can, it takes time and effort for the welding work, and the manufacturing cost is increased, so that the drum can only be used for special purposes.

  Even in the technique of Patent Document 2, laser welding is performed from the outer surface side of the drum can to the contact portion between the body plate 1 and the bottom plate 2 to fill the wedge-shaped space 7, so that there is no residue. When manufacturing a drum can, it takes time for welding work and increases the manufacturing cost, so it is used only for special purposes.

  In the technique of Patent Document 3, a wide space is formed between the peripheral portion of the bottom plate 2 and the body plate 1, but welding performed on the reduced diameter base portion of the joint portion 1 </ b> A fills the wedge-shaped space 7. This is an auxiliary tool for tightening, and it is not necessary to weld all around the circumference.Furthermore, since the welded part is provided below the reduced diameter base, Even if it goes, the problem that the wedge-shaped space 7 remains over the entire circumference and the contents are trapped in the wedge-shaped space 7 remains as it is.

  It is an object of the present invention to provide a drum can structure that solves the above-mentioned problems in a method that is relatively inexpensive and inexpensive to manufacture.

  The features of the present invention for solving such problems are as follows.

  1. A first aspect of the present invention is a drum can having a barrel plate forming a cylindrical body portion, a bottom plate fixed to an inner surface of a lower end portion of the barrel plate, and a cylindrical side wall portion following the bottom plate. The body plate portion above the upper end of the joining portion with the side wall portion forms an outward convex portion with respect to the cylindrical body portion, and the bottom plate, the upper end of the joining portion, and the outward convex portion are continuous. A drum can characterized by forming a smooth surface.

  2. According to a second aspect of the present invention, there is provided a drum can manufacturing method comprising: a body plate forming a cylindrical body portion; a bottom plate fixed to an inner surface of a lower end portion of the body plate; and a cylindrical side wall portion following the bottom plate. Joining the cylindrical side wall part, forming an outward convex part with respect to the cylindrical body part at the body plate part above the upper end of the joint part, and forming the bottom plate, the upper end of the joint part and the outward convex part It is the manufacturing method of the drum can characterized by processing so that a part may form the continuous smooth surface.

  In the drum can of the present invention, since there is no wedge-shaped gap in the contact portion between the body plate and the bottom plate, there is an effect that the cleaning property is improved and the residue after cleaning is not generated. In addition, since there is no wedge-shaped gap, there is an effect that, even if coating is performed on the inner surface side of the drum can, a coating defect does not occur.

  As shown in FIG. 1, the drum can according to the present invention has a cylindrical body portion that forms the entire drum can in a portion of the body plate 1 above the upper end of the joint portion 3 between the body plate 1 and the tubular side wall portion 5. The outer convex part 4 is formed with respect to 10, and the bottom plate 2, the welded part 3 (corresponding to the upper end of the contact part between the body plate 1 and the cylindrical side wall part 5) and the outer convex part 4 are continuous and smooth. A surface is formed.

  By adopting such a shape, when the contents filled in the drum can have been used and cleaned, there are no places where fingers or cleaning tools can reach and the cleaning performance is improved, and the bottom plate 2 and the welded portion 3 Since the outer convex part 4 forms a continuous and smooth surface, the wedge-shaped space 7 and the convex part do not exist, so that the contents can be discharged smoothly, and the residue substantially remains in the drum. There is no. Therefore, the contents will not leak due to corrosion.

  For welding for forming the welded portion 3, resistance welding is usually used, but covered arc welding, thermite welding, or FSW (Friction Stir Welding) may be used. When the body plate 1 and the bottom plate 2 are made of a material such as stainless steel or aluminum, a TIG arc welding method, a MIG arc welding method, or an electron beam welding method can also be used. Or if the laser beam welding method is used, the application range of material will further expand. In addition, you may adhere | attach using a normal resin-type adhesive agent.

  Hereinafter, the manufacturing method of the drum can of this invention is described in an Example.

  1 and 2 show an embodiment of the cross-sectional shape of the drum can of the present invention. FIG. 1 is an enlarged view of a main part, and FIG. 2 is a diagram showing the whole and the main part. The outer diameter line indicated by the solid line is the cross-sectional shape of the present invention, and the line indicated by the broken line is the cross-sectional shape of a normal drum can. 1 is a body plate, 2 is a bottom plate, 3 is a welded portion, 4 is an outward convex portion of the body plate, and 6 is a tightening portion. A conventional drum can has a wedge-shaped space 7 as shown in FIG. 6, but the shape of the drum can of the present invention is as shown in FIG. And the outward convex portion 4 form a continuous and smooth surface, and the wedge-shaped space 7 and the convex portion do not exist on the surface. As a result, the contents can be smoothly discharged, and substantially no residue remains in the drum. Therefore, the contents will not leak due to corrosion.

  FIG. 3 is an example showing a welding method, and shows an example using a resistance welding method. The resistance welding method is a method generally used as a drum can welding method because it does not use a molten material, has a beautiful finish, and can be performed at low cost. A conventional normal drum can is one in which the electrode 11 is pressed against the contact surface between the body plate 1 and the cylindrical side wall portion 5 and is energized and fused. As previously shown in FIG. 6, since the bent portion 8 exists between the bottom plate 2 and the cylindrical side wall portion 5, the upper end of the welded portion is usually a cylindrical shape at the lower end of the bent portion 8. The point in contact with the side wall 5 is the uppermost end.

  Therefore, after the welding, the wedge-shaped space 7 is present. In the present invention, how to eliminate the wedge-shaped space 7 will be described later, but it is preferable to follow such resistance welding. Such welding is performed when the content to be filled in the drum can is a liquid, and the liquid is prevented from leaking from the winding portion 6 through the gap between the cylindrical side wall portion 5 and the body plate 1. It is to do. Furthermore, in order to prevent liquid leakage more reliably, a packing can be inserted into the winding tightening portion 6.

  FIG. 4 shows an embodiment of a processing method for forming a smooth surface in which the bottom plate 2, the welded portion 3, and the outward projection 4 are continuous without the wedge-shaped space 7 using the drum can assembled in FIG. 3. It is an example and the case by spinning process is shown.

  FIG. 4A shows that while rotating the roll 12, the corner plate 1 and the bottom plate 2 of the drum can 15 installed on the mold 14 are spread out so that the body plate 1 and the cylindrical side wall 5 Processing method for forming the outward convex portion 4 in the portion of the body plate 1 above the upper end of the joint portion 3 and forming a continuous surface of the welded portion 3, the bottom plate 2 and the outward convex portion 4 FIG.

  FIG. 4B is a diagram for explaining a processing method for smoothing the surface formed in FIG. 4A, in particular, the upper end portion of the welded portion 3 with the roll 13. By the above two processing methods, the bottom plate 2, the welded portion 3, and the outward convex portion 4 form a continuous and smooth surface.

  FIG. 5 is a diagram illustrating the cross-sectional shape of the drum can before and after the spinning process. FIG. 5A is a diagram for explaining a cross-sectional shape before spinning, and a wedge-shaped space 7 exists. FIG. 5B is a diagram for explaining the cross-sectional shape after the spinning process, in which the wedge-shaped space 7 does not exist, and the bottom plate 2, the welded portion 3, and the outward convex portion 4 form a smooth surface. .

  In the first embodiment, the outer convex portion 4 is formed in the portion of the body plate 1 above the upper end of the joint portion 3 between the body plate 1 and the cylindrical side wall portion 5 by spinning after assembling the drum can. Although shown, in the present embodiment, an embodiment is shown in which the body plate 1 in which the outward projection 4 is formed in the lower part of the body plate 1 is used.

  1 and 2 are sectional views showing the product shape of the present invention. The body plate 1, the cylindrical side wall portion 5, and the bottom plate 2, which are formed by pressing the outer convex portion 4 at the lower portion of the body plate 1, are shown in FIGS. An integrated member is prepared. The prepared body plate 1, the cylindrical side wall portion 5 and the bottom plate 2 are combined together, and the curved portion of the cylindrical side wall portion 5 following the bottom plate 2 and the outward convex portion 4 of the body plate 1 are continued. Resistance welding is performed by applying an electrode for resistance welding to a contact portion with the bent portion, and the welded portion 3 is formed.

  In this case, the curvature of the curved portion 8 of the cylindrical side wall portion 5 following the bottom plate 2 and the curvature of the curved portion following the outward convex portion 4 of the trunk plate 1 are made as tight as possible, and the trunk plate 1 and the cylindrical side wall portion 5 are as much as possible. When the wedge-shaped space 7 is resistance welded when a member in which the base plate 2 and the bottom plate 2 are integrated is combined, it is preferable that the radius of curvature of both curved portions is made small to such an extent that it virtually disappears. Also by this method, the wedge-shaped space 7 as shown in FIGS. 1 and 2 does not exist, and a smooth surface in which the bottom plate 2, the welded portion 3, and the outward convex portion 4 are continuous can be formed. The winding part 6 may be formed at either timing before or after welding.

  Similar to the second embodiment, a body plate 1 in which an outward projection 4 is formed on the lower portion of the body plate 1 by pressing or the like, a member in which the cylindrical side wall portion 5 and the bottom plate 2 are integrated are prepared. Next, the prepared body plate 1, the cylindrical side wall portion 5, and the bottom plate 2 are combined to form the welded portion 3 by covering arc welding, laser welding, or FSW (Friction Stir Welding). In this case, the weld built-up portion formed on the inner surface side of the can is removed by a grinder or the like so that the bottom plate 2, the welded portion 3, and the outward convex portion 4 form a smooth surface.

  In the same manner as in Example 2 or Example 3, a member obtained by integrating the body plate 1, the cylindrical side wall portion 5, and the bottom plate 2 in which the outward projection 4 is formed on the lower portion of the body plate 1 by pressing or the like is prepared. To do. Next, the welded portion 3 can be formed by thermite welding by combining the prepared body plate 1, the cylindrical side wall portion 5, and the member obtained by integrating the bottom plate 2. In addition, you may adhere | attach using a normal resin-type adhesive agent.

  Thermite welding is welding using reaction heat generated by a chemical reaction between iron oxide and aluminum powder solvent (aluminum oxidation), and the body plate 1, the cylindrical side wall portion 5 and the bottom plate 2 are integrated. Even if there are some gaps between them, it can be filled by adjusting the amount of the solvent. By polishing the upper surface of the welded portion with a grinder or the like, it is possible to form a smooth surface in which the bottom plate 2, the welded portion 3, and the outward convex portion 4 are continuous.

  According to the present invention, since a continuous and smooth surface can be formed, the present invention can be applied to containers in which leakage of contents such as paint cans and chemical cans becomes a problem in addition to drum cans.

It is a figure explaining the cross-sectional shape of the drum can of one Example of this invention. It is a figure explaining the cross-sectional shape of the drum can of one Example of this invention. It is a figure explaining a resistance welding method. It is a figure explaining the 1st process of spinning processing. It is a figure explaining the 2nd process of spinning processing. It is a figure explaining the cross-sectional shape of the drum can corner | angular part before a spinning process. It is a figure explaining the cross-sectional shape of the drum can corner | angular part after a spinning process. It is a figure explaining a prior art. It is a figure explaining a prior art. It is a figure explaining a prior art. It is a figure explaining a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body plate 2 Bottom plate 3 Welding part 4 Outward convex part 5 Cylindrical side wall part 6 Winding part 7 Wedge-like space 8 Curved part 10 Cylindrical body part 11 Electrode 12 1st roll 13 2nd roll 14 Mold 15 Drum can 21 Circumferential welding Part 22 Restricted part formed in the can body

Claims (2)

In a drum can having a body plate forming a cylindrical body part, a bottom plate fixed to an inner surface of a lower end part of the body plate, and a cylindrical side wall part following the bottom plate, a joint part between the body plate and the cylindrical side wall part The body plate portion above the upper end forms an outward convex portion with respect to the cylindrical body portion, and further, the bottom plate, the joint upper end and the outward convex portion form a smooth surface. A drum can characterized by that.
  In a method for manufacturing a drum can having a barrel plate that forms a cylindrical barrel portion, a bottom plate that is fixed to the inner surface of the lower end portion of the barrel plate, and a cylindrical sidewall portion that follows the bottom plate, the barrel plate, the cylindrical sidewall portion, And forming an outward convex portion with respect to the cylindrical body portion in the body plate portion above the upper end of the joint portion, and the bottom plate, the upper end of the joint portion, and the outward convex portion being continuous. A method for manufacturing a drum can, characterized by processing to form a smooth surface.

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