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JP-2026075956-A - Corner structure, corner welding joining method, and method for manufacturing a box with an external fitting lid.

JP2026075956AJP 2026075956 AJP2026075956 AJP 2026075956AJP-2026075956-A

Abstract

[Problem] To provide a corner welding joining method that can be manufactured in a short time and maintains a high-quality appearance of the welded joint. [Solution] The corner welding joining method is formed by making a first part (1) from sheet metal (W) having a first base (11) and a first upright part (12) bent at 90° relative to the first base (11), and making a second part (2) from sheet metal (W) having a second base (21) and a second upright part (22) bent at 90° relative to the second base (21) and the end of the second upright part (22) The part (22a) is formed to have a protruding portion (221) that extends outward at its base, and the protruding portion (221) is formed to conform to the outer radius shape of the base of the first upright portion (12) at the corner formed by abutting the end portion (22a) of the second upright portion (22) against the outer surface (12b) of the first upright portion (12) of the first part (1), and the abutting portion at the corner is welded together. [Selection Diagram] Figure 4A

Inventors

  • 武田 知里
  • 小林 泰之

Assignees

  • 株式会社アマダ

Dates

Publication Date
20260511
Application Date
20241023

Claims (6)

  1. A first part formed from sheet metal, having a first base and a first upright portion bent at a 90° angle to the first base, A second part formed of sheet metal, having a second base, a second upright portion bent at a 90° angle to the second base, and a protrusion formed at the base of the end of the second upright portion so as to project outward, Equipped with, A corner structure in which the end of the second upright portion abuts against the outer surface of the first upright portion of the first part, and the protrusion protrudes along the outer radius shape of the base of the first upright portion to form a corner.
  2. The corner structure according to claim 1, wherein the outer shape of the protrusion is formed by straight lines only, curves only, or a mixture of straight lines and curves.
  3. The first part is formed from sheet metal having a first base and a first upright portion bent at a 90° angle to the first base. The second part is formed from sheet metal having a second base, a second upright portion bent at a 90° angle to the second base, and a protrusion that projects outward at the base of the end of the second upright portion. The aforementioned protrusion is The corner formed by abutting the end of the second upright portion against the outer surface of the first upright portion of the first part is formed to conform to the outer radius shape of the base of the first upright portion. A corner welding method for welding together the abutting portion at the corner.
  4. The corner welding joining method according to claim 3, wherein the outer shape of the second part is formed by cutting the sheet metal along a predetermined cutting line using a laser, and within the range of the cutting line forming the end portion, a protruding line forming the convex portion and a recessed line that recesses inward for a predetermined length including the position where it intersects with the bending line of the second upright portion are provided.
  5. The corner welding joint method according to claim 4, wherein the protruding line is provided as a straight line only, a curved line only, or a mixture of straight lines and curves.
  6. It has a lid and body in the style of an inro (a type of Japanese medicine box), A method for manufacturing a box equipped with an external fitting lid, wherein the main body is manufactured using the corner welding joining method described in any one of claims 3 to 5.

Description

This invention relates to a corner structure, a method for welding and joining corners, and a method for manufacturing a box equipped with an external fitting lid. Patent Document 1 describes how a bulge occurs in the direction of the fold line at the bend when a metal plate is bent, and a method for setting the cutting line of a product to prevent this bulge from occurring when the product is bent. Patent Document 2 describes a wooden box, known as an inro box, in which the lid is fitted over the main body with the lid facing outwards (external fitting type). An inro-type box with the lid facing outwards (hereinafter referred to as a box with an external fitting lid) has a frame-like protruding part from the main body, and the lid engages with this protruding part, creating a double-layered structure at the engagement point. Because this box with an external fitting lid easily achieves watertightness due to its double-layered structure when the lid is placed over the main body, it is used in metal form, for example, as a metal box for a distribution panel. Patent No. 6899253Japanese Patent Publication No. 2008-280075 Figure 1A is a perspective view of the assembled main body C manufactured by the corner welding method according to the second embodiment of the present invention.Figure 1B is a perspective view showing a box CD comprising the main body C and the outer fitting lid D.Figure 2A is an assembly diagram of the first part 1 and the second part 2 for illustrating the corner welding method according to a second embodiment of the present invention.Figure 2B is a perspective view showing the first part 1.Figure 2C is a perspective view showing the second part 2.Figure 3A is a plan view showing a portion of the cutting line LP when cutting out the second part 2.Figure 3B is an enlarged view of section B in Figure 3A.Figure 4A is a partial perspective view showing abutment body KT formed by abutting the second part 2 against the first part 1.Figure 4B is a partial perspective view showing the welded body YT obtained by welding to the butt body KT.Figure 5A is a partial perspective view showing abutment body KTP, which is a comparative example of abutment body KT.Figure 5B is a partial perspective view showing weld YTP, which is a comparative example of weld YT. (Regarding the main body C of the box CD equipped with an external fitting lid D) The main body C of the box CD equipped with an external fitting lid D will be described with reference to Figures 1A and 1B. Figure 1A is a perspective assembly drawing of the main body C having the corner structure of the first embodiment of the present invention and manufactured by the corner welding method of the second embodiment. Figure 1B is a perspective view showing the box CD equipped with an external fitting lid D including the main body C. For the sake of explanation, the up and down directions are defined by the directions indicated by arrows in each figure. Also, the thickness of the sheet metal is omitted in Figures 1A and 1B. As shown in Figure 1B, the box CD is composed of a main body C and an outer fitting lid D. Hereafter, the outer fitting lid D will also be simply referred to as lid D. Similarly, the box CD equipped with the outer fitting lid D will also be simply referred to as box CD. The main body C is formed from a metal plate. As shown in Figure 1A, the main body C is formed by abutting a pair of side panels C2 against the end of the base C1 (see arrow DR1), and welding the abutted portion together with a welded joint E, as shown in Figure 1B. The main body C has a frame-shaped projection C3 extending upward. The lid D engages almost seamlessly with the projection C3, with the lid facing outwards, creating a double-layered structure. That is, the box CD is constructed so that the lid D fits over the main body C, and the abutting portions of the multiple parts of the main body C are welded together, allowing for watertight sealing. In particular, the projection C3 has a draining function, making it suitable for use, for example, as a container for an electrical distribution panel. As shown in Figure 1A, the base C1 is a member with a roughly U-shaped cross-section, formed from a metal sheet by punching and three-stage bending. Specifically, the base C1 has a bottom wall C11, a pair of side walls C12, a pair of flanges C13, and a pair of uprights C14. The uprights C14 are raised from a position that extends inward by a predetermined distance La from both end faces of the flanges C13. The base C1 is a flat plate and forms the bottom plate of the box CD. The pair of side wall sections C12 are bent at a 90° angle from the pair of side edges of the base C1 to form the side plates of the box CD. The flange sections C13 are bent at a 90° angle from the ends of each side wall section C12, moving inward and parallel to the base C1. The flange sections C13 are the parts that abut against when the lid D is placed on top. The upright sections C14 are parts