JP2021137389A - Method of manufacturing sheet-metal structure, method of manufacturing store fixture with top board, and sheet-metal structure - Google Patents

Abstract

To prevent an unnecessary gap from being made at a corner part, in a sheet-metal structure having the corner part with a coated surface.SOLUTION: A method of manufacturing a sheet-metal structure includes: a bending step of making mutually adjacent ends of first and second surface parts 40 and 50 close to each other by bending parts, which serve as first and second ridge lines L1 and L2, of a sheet metal 70; a crushing step of forming a third ridge line L3 by crushing the adjacent ends of the first and second surface parts 40 and 50 from the outside and making the adjacent ends abut on each other; and a coating step of coating outer surfaces of the first and second surface parts 40 and 50 in a range including at least the third ridge line L3.SELECTED DRAWING: Figure 7

Description

The present invention relates to a method for manufacturing a sheet metal structure, a method for manufacturing furniture with a top plate, and a sheet metal structure.

In offices, public facilities, and other office spaces, fixtures are generally installed to improve the work efficiency of employees. As such fixtures, for example, as disclosed in Patent Document 1, fixtures with a top plate having a top plate supported by a leg or the like are widely used.

Japanese Patent No. 6019145

For example, a part of the top plate is formed of sheet metal and has corners formed by bending a plurality of edges of the sheet metal. In such a corner portion, a minute gap is generated between one ends of the bent edge portion. When the decorative plate is installed on the surface of the sheet metal, the gap is covered with the decorative plate. However, when the decorative plate is not installed on the surface of the sheet metal and the sheet metal is colored by painting, the gap is exposed to the outside. For this reason, when the worker touches one end of the edge, the worker feels uncomfortable or the appearance of the top plate deteriorates.

In furniture, not only the top plate but also a sheet metal structure formed of sheet metal is used in many parts such as the upper part of the cabinet. Among such sheet metal structures, those having corners formed by bending the edges of the sheet metal all have the same problem when a gap is generated in the corners.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to prevent unnecessary gaps from being generated in the corners of a sheet metal structure having corners whose surface is painted.

The present invention employs the following configuration as a means for solving the above problems.

In the first invention, the base surface portion, the first surface portion that bends and extends from the first ridge line of the base surface portion, and the first surface portion are adjacent to the first ridge line on the same side as the side extending from the base surface portion. A method for manufacturing a sheet metal structure in which a sheet metal structure having a second surface portion that bends and extends from a second ridge line is manufactured from a plate-shaped material to be formed by sheet metal processing. A bending step in which the 1st ridge line and the portion to be the 2nd ridge line are bent so that the adjacent ends of the 1st surface portion and the 2nd surface portion are brought close to each other, and the 1st surface portion and the 2nd surface portion are adjacent to each other. A crushing step of forming a third ridge by crushing at least one of the ends from the outside to bring the adjacent ends into contact with each other, and the first surface and the second for a range including at least the third ridge. A configuration is adopted in which the outer surface of the surface portion is coated with a coating process.

In such a first invention, at least one of the adjacent ends of the first surface portion and the second surface portion arranged close to each other is crushed, so that between the adjacent ends of the first surface portion and the second surface portion. The gap can be eliminated or reduced. Therefore, by painting the portion including the third ridge line formed by abutting the adjacent end portions, the gap between the adjacent end portions becomes invisible, and the base surface portion, the first surface portion, and the second surface portion are made invisible. The surface of the corner portion formed by the surface portion can be smoothed. Therefore, according to the present invention, it is possible to prevent unnecessary gaps from being generated at the corners of the sheet metal structure.

In the second invention, in the first invention, the crushing step is a top crushing step of crushing the top to which the first ridge line, the second ridge line and the third ridge line are connected, and the adjacent end portion. A configuration is adopted in which at least one of the above is curved from the outside to the inside with an end bending step.

According to the second invention as described above, since the top portion to which the first ridge line, the second ridge line and the third ridge line are connected is crushed, it is possible to prevent the occurrence of a sharp portion with respect to the corner portion. Further, according to the present invention, since at least one of the adjacent ends of the first surface portion and the second surface portion is curved, the surface of the corner portion can be made smoother.

In the third invention, in the second invention, the configuration in which the end bending step is performed after the top crushing step is adopted.

According to such a third invention, it is possible to prevent the adjacent ends of the first surface portion and the second surface portion from being separated from each other when the top portion is crushed.

The fourth invention has a configuration in which, in any one of the first to third inventions, there is a polishing step of polishing the outer surfaces of the adjacent end portions after the crushing step and before the painting step. adopt.

According to the fourth invention as described above, since the surfaces of the adjacent end portions of the first surface portion and the second surface portion are polished, the surface of the corner portion can be made smoother. Therefore, the coating can be uniformly performed on the surface of the corner portion, and the appearance of the sheet metal structure can be further improved.

In the fifth invention, in any one of the first to fourth inventions, a configuration is adopted in which the bending step is followed by a welding step for connecting the first surface portion and the second surface portion.

According to such a fifth invention, the first surface portion and the second surface portion are joined by a welding step. Therefore, it is possible to prevent the first surface portion and the second surface portion from being separated by external pressure, and for example, it is possible to prevent a gap from being formed at the corner portion after the start of use of the sheet metal structure.

The sixth invention is a method for manufacturing furniture with a top plate, and the top plate including the sheet metal structure at least in a part is formed by the method for manufacturing a sheet metal structure according to any one of the first to fifth inventions. A configuration is adopted in which the top plate forming step and the support structure mounting step of mounting the support structure for supporting the top plate from below to the top plate are provided.

According to such a sixth invention, it is possible to manufacture a furniture with a top plate having a top plate on which at least a part is formed by using the method for manufacturing a sheet metal structure of the present invention. Therefore, it is possible to manufacture furniture with a top plate that can prevent unnecessary gaps from being generated at the corners of the top plate.

The seventh invention is a sheet metal structure, in which a plate-shaped base surface portion, a plate-shaped first surface portion bent and extended from the first ridge line of the base surface portion, and the first surface portion extend from the base surface portion. A plate-shaped second surface portion that bends and extends from the second ridge line adjacent to the first ridge line is provided on the same side as the side, and at least one of the first surface portion and the adjacent end portions of the second surface portion is outside. A third ridge line is formed by being crushed from the surface, and the outer surface of the first surface portion and the second surface portion is painted over at least the range including the third ridge line.

According to the seventh invention as described above, since at least one of the adjacent ends of the first surface portion and the second surface portion arranged close to each other is crushed, the adjacent ends of the first surface portion and the second surface portion are crushed. The gap between the parts can be eliminated or reduced. Therefore, by painting the portion including the third ridge line formed by abutting the adjacent end portions, the gap between the adjacent end portions becomes invisible, and the base surface portion, the first surface portion, and the second surface portion are made invisible. The surface of the corner portion formed by the surface portion can be smoothed. Therefore, according to the present invention, it is possible to prevent unnecessary gaps from being generated at the corners of the sheet metal structure.

According to the present invention, the adjacent ends of the first surface portion and the second surface portion arranged in close proximity to each other are crushed, so that the surfaces of the corner portions formed by the base surface portion, the first surface portion and the second surface portion are smoothed. This makes it possible to prevent unnecessary gaps from being generated at the corners of the sheet metal structure.

It is a perspective view which shows the schematic structure of the desk unit provided with the desk in one Embodiment of this invention. It is a perspective view which shows the schematic structure of the desk in one Embodiment of this invention. It is an exploded perspective view which shows the schematic structure of the desk in one Embodiment of this invention. It is an enlarged perspective view of the part where the corner part of the upper structure part provided with the desk in one Embodiment of this invention is provided, (a) is the perspective view seen from above, and (b) is the state which turned upside down. It is a perspective view of. It is a schematic view of the sheet metal used for the manufacturing method of the upper structure part provided with the desk in one Embodiment of this invention, (a) is a plan view, and (b) is a perspective view. (A) is a perspective view of the sheet metal including the top as viewed from above, and (b) is a cross-sectional view taken along the line AA of (a). (A) is a perspective view showing a corner portion in a state where one end portion of the first edge portion and one end portion of the second edge portion are in contact with each other, and (b) is a one end portion and the second end portion of the first edge portion. It is a horizontal cross-sectional view of the corner part in a state where one end part of an edge part is in contact with each other. It is a horizontal cross-sectional view of the corner part in the state where one end part of the 1st edge part and one end part of the 2nd edge part were polished. It is a perspective view which turned upside down the corner part which shows the state of welding a 1st edge part and a 2nd edge part. It is a schematic perspective view which shows the state of painting a sheet metal. It is a schematic perspective view which shows the leg body attachment process which attaches the leg body which supports the top plate from below to the top plate.

Hereinafter, a method for manufacturing a sheet metal structure, a method for manufacturing a fixture with a top plate, and an embodiment of the sheet metal structure according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of the desk unit 1. The desk unit 1 is a fixture installed in an office space such as an office or a public facility to provide an employee with a work space for efficiently handling electronic devices and the like. As shown in FIG. 1, the desk unit 1 is a desk 2 (Furniture with top plate), wagon 3, clamp device 4, lighting device 5, and desktop tap 6 are provided. The desk unit 1 does not necessarily have a configuration including the wagon 3, and may be configured not to include the wagon 3. Further, the desk unit 1 may be provided with other optional members or the like.

In the following description, the front side of the desk unit 1 is referred to as a front, the back side is referred to as a rear, the left hand side is referred to as a left, and the right hand side is referred to as a right when viewed from an operator who works on the desk unit 1. That is, as shown in FIG. 1, the direction in which the pair of legs 10 described later of the desk 2 are arranged apart from each other is defined as the left-right direction, and the horizontal direction orthogonal to the left-right direction is defined as the front-rear direction. Further, the direction of gravity (the direction along the normal line of the floor on which the desk 2 is placed) is the vertical direction.

FIG. 2 is a perspective view of the desk 2. Further, FIG. 3 is an exploded perspective view of a part of the desk 2. The desk 2 is a fixture that provides a work surface on which electronic devices and the like used by workers can be placed. As shown in FIGS. 2 and 3, a pair of legs 10 (support structure) and a ceiling A plate 11, a curtain plate 12, a wiring duct 13, a cover portion 14, and a vertical wiring duct 15 are provided.

Each leg 10 includes a frame-shaped frame 10a in which four linear frames are connected in a square frame shape, and an adjuster 10b connected to the lower end of the frame-shaped frame 10a. The adjusters 10b are brought into contact with the floor surface of these legs 10 to support the top plate 11 from below.
As shown in FIG. 2, these pair of leg bodies 10 are arranged so as to be separated from each other in the left-right direction with the frame-shaped frames 10a facing each other. That is, in the present embodiment, the left-right direction is the separation direction of the pair of legs 10. The leg body 10 may be provided with a panel for closing the opening of the frame-shaped frame 10a, or may be provided with a panel-shaped frame instead of the frame-shaped frame 10a.

The top plate 11 is a plate-shaped member with the front and back surfaces facing in the vertical direction, and in the present embodiment, the top plate 11 has a rectangular shape in a plan view in which the left-right direction is the longitudinal direction and the front-rear direction is the lateral direction. The top plate 11 has legs 10 fixed to each of the lower surface of the left edge and the lower surface of the right edge by fasteners (not shown) or the like, and is supported from below by these legs 10. The upper surface 11a of such a top plate 11 forms a work surface on which an employee places an electronic device or the like. The length dimension of the top plate 11 in the front-rear direction is substantially the same as the length dimension of the leg body 10 in the front-rear direction.

As shown in FIGS. 1 to 3, the top plate 11 includes an upper structure portion 20 (sheet metal structure) having a work surface (upper surface 11a) and a lower structure portion 30 that supports the upper structure portion 20 from below. ing. The upper structure portion 20 is formed by bending the edge portion of a flat plate-shaped sheet metal, and the surface thereof is painted. 4A and 4B are enlarged perspective views of a portion of the upper structure portion 20 where the corner portion 60 is provided, FIG. 4A is a perspective view seen from above, and FIG. 4B is a perspective view in a state of being turned upside down. be. As shown in FIG. 4, the upper structure portion 20 of the top plate 11 has a flat plate portion 21 (base surface portion), a peripheral wall portion 22, a stretched piece 23, and a joint portion 24.

The flat plate portion 21 is a flat plate-shaped portion whose upper surface is a work surface (upper surface 11a), and has a rectangular shape in a plan view. The peripheral wall portion 22 is a portion that hangs downward from the outer edge of the flat plate portion 21 (the outermost edge in a plan view and corresponding to the four sides of the rectangular flat plate portion 21). That is, the peripheral wall portions 22 are provided on each of the four sides of the flat plate portion 21 having a rectangular shape in a plan view, and are arranged in a frame shape as a whole.

The horizontal ends of these peripheral wall portions 22 are curved so as to face the inside of the top plate 11 in a plan view, and are in contact with each other. In the present embodiment, when the ends of the peripheral wall portions 22 come into contact with each other, the minute gaps generated at the boundaries between the end portions of the peripheral wall portions 22 are buried by the coating film provided on the surface, and are external. It is said that it is not visually visible.

The stretched piece 23 is a portion stretched from the lower end of the peripheral wall portion 22 toward the central portion of the flat plate portion 21 in a plan view. That is, the stretch piece 23 provided at the lower end of the peripheral wall portion 22 connected to the outer edge on the front side of the flat plate portion 21 is extended from the peripheral wall portion 22 toward the rear. Further, the extension piece 23 provided at the lower end of the peripheral wall portion 22 connected to the outer edge on the rear side of the flat plate portion 21 is extended from the peripheral wall portion 22 toward the front. Further, the extension piece 23 provided at the lower end of the peripheral wall portion 22 connected to the outer edge on the left side of the flat plate portion 21 is extended from the peripheral wall portion 22 toward the right. Further, the extension piece 23 provided at the lower end of the peripheral wall portion 22 connected to the outer edge on the right side of the flat plate portion 21 is extended from the peripheral wall portion 22 toward the left. These stretched pieces 23 are arranged below the flat plate portion 21 and are horizontally stretched so as to be parallel to the flat plate portion 21.

As shown in FIG. 4B, the joint portion 24 is a portion for joining two adjacent stretched pieces 23. The joint portion 24 is formed by arc welding the boundary portion between two stretched pieces 23 arranged adjacent to each other. Such a joint portion 24 prevents the two peripheral wall portions 22 from being moved in a direction in which the two peripheral wall portions 22 are separated from each other due to the assembly of the desk 2 or the aged deterioration of the desk 2, and the upper structural portion 20 of the top plate 11. Prevents the shape of the.

The upper structure portion 20 is formed by bending a flat sheet metal 70 (see FIG. 5) by sheet metal processing. The peripheral wall portion 22 and the stretched piece 23 are portions formed by the bent edge portion of the sheet metal 70, and the flat plate portion 21 is a flat portion formed by the unbent portion of the sheet metal.

Here, for convenience of explanation, the peripheral wall portion 22 located on the right side in FIG. 4A is referred to as a first surface portion 40, and the peripheral wall portion 22 located on the left side in FIG. 4A is referred to as a second surface portion 50. In such an upper structure portion 20, the first surface portion 40 that bends from the first ridge line L1 of the flat plate portion 21 and extends downward, and the first surface portion 40 to the same side (lower side) as the side extending from the flat plate portion 21. It has one ridge line L1 and a second surface portion 50 that bends and extends from a second ridge line L2 adjacent to the ridge line L1. Further, the upper structure portion 20 is provided with a third ridge line L3 in which the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are in contact with each other. Further, the upper structure portion 20 is provided with a corner portion 60 formed by the flat plate portion 21, the first surface portion 40, and the second surface portion 50.

Further, in such a corner portion 60, the first ridge line L1 formed by bending the first surface portion 40 with respect to the flat plate portion 21 and the second surface portion 50 are bent with respect to the flat plate portion 21. The portion (top 61) where the second ridge line L2 and the third ridge line L3 formed in the above are connected is crushed from diagonally above toward the inside of the top plate 11. By being crushed in this way, as shown in FIG. 4A, the top portion 61 has a substantially flat chamfered shape having no sharp portion. Further, in the corner portion 60, the end portion 41 of the first surface portion and the end portion 51 of the second surface portion 50 are curved so as to be crushed from the outside to the inside of the top plate 11. That is, in the present embodiment, the corner portion 60 is crushed toward the inside of the top plate 11. The surface of the sheet metal is painted including the portion having the corner portion 60 crushed in this way.

According to such an upper structure portion 20 (that is, a desk 2 having the upper structure portion 20), a third ridge line L3 formed by abutting the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50. Since the corner portion 60 including the above is crushed, the gap between the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 can be eliminated or reduced. Therefore, by painting the portion having the corner portion 60, the gap between the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 cannot be visually recognized from the outside, and the surface of the corner portion 60 is smoothed. Can be. Therefore, according to the upper structure portion 20 of the present embodiment, it is possible to prevent an unnecessary gap from being generated in the corner portion 60.

Returning to FIGS. 1 to 3, the curtain plate 12 is a plate-shaped member that connects the rear end portion of one leg body 10 and the rear end portion of the other leg body 10. The curtain plate 12 is fixed to each leg 10 by a fastener (not shown). The curtain plate 12 has a curtain plate vertical frame 12a directly fixed to the frame-shaped frame 10a of the leg body 10 and a curtain plate panel 12b supported by the curtain plate vertical frame 12a. The curtain plate vertical frame 12a is arranged at each of the left and right ends of the curtain plate 12, and is fixed to the frame-shaped frame 10a by fasteners (not shown). The curtain plate panel 12b is a panel body in which each of the left and right end portions is fixed to the curtain plate vertical frame 12a, and the front and back surfaces are arranged so as to face the front-rear direction. The upper end edge and the lower end edge of the curtain plate panel 12b are folded back toward the front. Further, a gap S is provided between the top plate 11 and the curtain plate 12. Through this gap S, a wiring cable or the like can be taken in and out of the wiring accommodation area R of the wiring duct 13 from the rear side of the top plate 11.

The wiring duct 13 is arranged below the top plate 11 and has a wiring accommodating area R extending in the left-right direction. As shown in FIG. 3, the wiring duct 13 has a bottom plate 13a, a rear standing piece 13b, and a front standing piece 13c. The bottom plate 13a forms the bottom portion of the wiring duct 13, and has a plate shape with the mounting surface on which the contained items such as wiring can be placed facing upward. The bottom plate 13a has a long plate shape that is long in the left-right direction. For example, as shown in FIG. 3, the length dimension from one curtain plate vertical frame 12a of the curtain plate 12 to the other curtain plate vertical frame 12a. Has been done.

The rear standing piece 13b is erected upward from the rear side end portion of the bottom plate 13a. Further, a claw portion that can be locked to the curtain plate 12 is formed on the upper end edge of the rear standing piece 13b. The claws are provided so as to project horizontally from the rear side to the front, and are provided over the entire area of the rear standing piece 13b in the left-right direction. By locking the claw portion to the curtain plate panel 12b, the wiring duct 13 is supported with respect to the curtain plate 12. Such a rear standing piece 13b is arranged so as to face or approach the curtain plate panel 12b of the curtain plate 12. The front standing piece 13c is erected upward from the front side end portion of the bottom plate 13a. The vertical dimension of the front standing piece 13c is smaller than the vertical dimension of the rear standing piece 13b. That is, the front standing piece 13c is formed lower than the rear standing piece 13b.

Such a wiring duct 13 is formed of, for example, a hard resin, and forms a wiring accommodating area R surrounded by a bottom plate 13a, a rear standing piece 13b, and a front standing piece 13c.
Such a wiring accommodating area R is open upward, and wiring and the like can be taken in and out from above. Further, the wiring duct 13 has an open end in the left-right direction. Therefore, it is possible to insert wiring or the like from the outside of the wiring duct 13 into the wiring accommodating area R via the left-right end of the wiring duct 13.

The cover portion 14 is a member that can be attached to and detached from the wiring duct 13 and covers the wiring accommodating area R of the wiring duct 13 from the front side in a mounting posture mounted on the wiring duct 13. The width dimension of the cover portion 14 in the left-right direction is shorter than, for example, the distance dimension from one curtain plate vertical frame 12a of the curtain plate 12 to the other curtain plate vertical frame 12a. In the present embodiment, the width dimension of the cover portion 14 in the left-right direction is half of the separation dimension from one curtain plate vertical frame 12a of the curtain plate 12 to the other curtain plate vertical frame 12a, and one curtain plate. Two cover portions 14 can be mounted from the vertical frame 12a to the other curtain plate vertical frame 12a. That is, a plurality of (two in the present embodiment) cover portions 14 cover the entire wiring accommodation area R of the wiring duct 13. Each cover portion 14 has flexibility and is formed of, for example, a soft resin.

As shown in FIGS. 2 and 3, the vertical wiring duct 15 is fixed to the left leg 10 of the two legs 10. Specifically, of the four linear frames forming the frame-shaped frame 10a of the left leg body 10, the vertical frame is fixed in contact with the front side surface of the vertical frame arranged at the rear. The vertical wiring duct 15 is a member for guiding the wiring cable from the outside of the desk 2 to the wiring duct 13, and the main body duct 15a having an internal space for accommodating the wiring and the like and the main body duct 15a are combined with the frame-shaped frame 10a. It includes a fixture 15b for fixing and a detachable duct 15c that can be attached to and detached from the main body duct 15a.

A power strip D drawn out from the floor surface is attached to such a desk 2, for example, as shown in FIG. The power tap D includes a tap main body D1 provided with an outlet, and a wiring cable D2 connected to the tap main body D1. The tap body D1 of such a power tap D is placed in the wiring accommodation area R of the wiring duct 13, and the wiring cable D2 connected to the tap body D1 passes through the wiring duct 13 and the vertical wiring duct 15, for example, on the floor. Reached to the surface.

Returning to FIG. 1, the wagon 3 is a fixture that can accommodate the baggage and the like of the worker who uses the desk unit 1, and can be accommodated between the two legs 10 and below the top plate 11. .. The wagon 3 is provided with casters (not shown) on the lower surface thereof so that the wagon 3 can be easily moved in the front-rear direction.

The clamp device 4 is a fixture for supporting the lighting device 5 and the desktop tap 6. In the present embodiment, the clamping device 4 is fixed to the top plate 11 by sandwiching the trailing edge portion of the top plate 11 from above and below. Since the desk unit 1 of the present embodiment includes the lighting device 5 and the desktop tap 6, two clamp devices 4 are provided. A lighting device 5 is connected to one clamp device 4, and a desktop tap 6 is connected to the other clamp device 4.

Subsequently, a manufacturing method of the desk 2 of the present embodiment (manufacturing method of furniture with a top plate) will be described. In the following description, a particularly characteristic method of manufacturing the upper structure portion 20 of the top plate 11 (method of manufacturing a sheet metal structure) will be mainly described.

When manufacturing the upper structure portion 20, first, as shown in FIG. 5A, a sheet metal 70 (material to be molded) is prepared. FIG. 5A is a schematic plan view showing a part of the sheet metal 70. The sheet metal 70 has a flat plate shape, and has a portion that becomes the first surface portion 40 and the second surface portion 50 described above. These first surface portions 40 and second surface portions 50 will later become peripheral wall portions 22.

Subsequently, as shown in FIG. 5B, the portions to be the first surface portion 40 and the second surface portion 50 are bent. FIG. 5B is a schematic perspective view of the sheet metal 70. Here, the first surface portion 40 is bent with respect to the flat plate portion 21 so that the boundary between the first surface portion 40 and the flat plate portion 21 (the portion that becomes the first ridge line L1) is a mountain fold. Further, the second surface portion 50 is bent with respect to the flat plate portion 21 so that the boundary between the second surface portion 50 and the flat plate portion 21 (the portion that becomes the second ridge line L2) is mountain-folded. The mountain fold here means that the portion to be bent is bent downward when viewed from above. By bending the first surface portion 40 and the second surface portion 50 with respect to the flat plate portion 21 in this way, as shown in FIG. 5 (b), the end portion 41 and the second surface portion 50 of the first surface portion 40 The end 51 is brought close to it. That is, in the step shown in FIG. 5B, the portions of the sheet metal 70 that are the first ridge line L1 and the second ridge line L2 are bent so that the adjacent ends of the first surface portion 40 and the second surface portion 50 are brought close to each other. The bending process is shown.

Further, as shown in FIG. 5B, in the first surface portion 40 and the second surface portion 50, the portion of the first surface portion 40 and the second surface portion 50 where the extension piece 23 is formed so that the boundary between the peripheral wall portion 22 and the extension piece 23 is a mountain fold is the peripheral wall portion 22. It is bent with respect to the part to be.

Subsequently, as shown in FIG. 6, the first ridge line L1 formed by bending the first surface portion 40 with respect to the flat plate portion 21 and the second surface portion 50 formed by bending with respect to the flat plate portion 21. The top 61 connected to the second ridge line L2 is crushed. Note that FIG. 6A is a perspective view of the sheet metal 70 including the top portion 61 as viewed from above. Further, FIG. 6B is a cross-sectional view taken along the line AA of FIG. 6A. As shown in these figures, the top 61 is substantially flattened by being crushed. Such a step shown in FIG. 6 shows a top crushing step of crushing the top 61 to which the portions to be the first ridge line L1, the second ridge line L2, and the third ridge line L3 are connected. In such a top crushing step, for example, a core is inserted inside the sheet metal 70 in which the first surface portion 40 and the second surface portion 50 are bent, and a mold is formed with respect to the top 61 from diagonally above the sheet metal 70. By striking, the top 61 is crushed.

Subsequently, as shown in FIG. 7, the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are curved. In FIG. 7A, the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are curved so that the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are formed. It is a perspective view which shows the corner part 60 in the contact state. Further, FIG. 7B is a horizontal cross-sectional view of the corner portion 60 in a state where the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are in contact with each other. Here, for example, as shown in FIG. 7B, the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are curved inward of the upper structure portion 20 by using the mold K. Crush. As a result, the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are brought into contact with each other to form the third ridge line L3. Such a step shown in FIG. 7 shows an end bending step of bending the end 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 from the outside to the inside.

In the steps shown in FIGS. 6 and 7, the adjacent ends of the first surface portion 40 and the second surface portion 50 are crushed from the outside to bring the adjacent ends into contact with each other to form the third ridge line L3. The crushing process to be performed is shown. That is, in the present embodiment, the above-mentioned crushing step includes a top crushing step of crushing the top 61 and an end bending step of bending the end 41 of the first surface portion 40 and the end 51 of the second surface portion 50. Have.

Subsequently, as shown in FIG. 8, the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are polished. FIG. 8 is a horizontal cross-sectional view of the corner portion 60 in a state where the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are polished. Here, the end portion 41 and the second surface portion 50 of the first surface portion 40 are polished from the outside of the corner portion 60 using a file or the like. For example, when the end surface of the end portion 41 of the first surface portion 40 and the end surface of the end portion 51 of the second surface portion 50 are not in contact with each other in the entire area, but are in contact only with the inner portion of the corner portion 60. On the outer side of the corner 60, the end face of the end 41 of the first face 40 and the end face of the end 51 of the second face 50 are slightly separated from each other. Therefore, when polishing the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50, the end surface of the end portion 41 of the first surface portion 40 and the end surface of the end portion 51 of the second surface portion 50 are formed. Polishing is performed so as to scrape the portion where the end surface of the end portion 41 of the first surface portion 40 and the end surface of the end portion 51 of the second surface portion 50 are separated from each other, leaving the contacted portion. Such a step shown in FIG. 8 shows a polishing step of polishing the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50.

Subsequently, as shown in FIG. 9, the first surface portion 40 and the second surface portion 50 are welded. FIG. 9 is a perspective view in which the corner portion 60 showing how the first surface portion 40 and the second surface portion 50 are welded is turned upside down. As shown in this figure, the stretched piece 23 of the first surface portion 40 and the stretched piece 23 of the second surface portion 50 are subjected to arc welding or gas welding. As a result, the joint portion 24 is formed, and the first surface portion 40 and the second surface portion 50 are joined. Such a process shown in FIG. 9 shows a welding process for joining the first surface portion 40 and the second surface portion 50.

Subsequently, as shown in FIG. 10, the sheet metal 70 is painted. FIG. 10 is a schematic perspective view showing how the sheet metal 70 is painted. Here, the paint is applied to the surface of the sheet metal 70 (upper structure portion 20) including the corner portion 60, and then the paint is dried to perform the coating. For the main coating, the same coating material may be applied a plurality of times, or different types of coating materials may be applied so as to overlap each other. Such a step shown in FIG. 10 shows a painting step of painting the outer surface of the sheet metal 70 in a range including at least the third ridge line L3.

The upper structure portion 20 is manufactured by the above steps. After that, the top plate 11 is manufactured by joining the upper structure portion 20 and the lower structure portion 30 manufactured separately (top plate manufacturing process). Further, as shown in the perspective view of FIG. 11, the desk 2 is manufactured by performing a leg body attaching step (support structure attaching step) of attaching the leg body 10 that supports the top plate 11 from below to the top plate 11. ..

As described above, the flat plate portion 21, the first surface portion 40 that bends and extends from the first ridge line L1 of the flat plate portion 21, and the first ridge line L1 to the same side as the side where the first surface portion 40 extends from the flat plate portion 21. The method for manufacturing the upper structure portion 20 having the second surface portion 50 bent and extending from the adjacent second ridge line L2 from the plate-shaped sheet metal 70 by sheet metal processing is the first of the sheet metal 70. A bending step in which the portions to be the first ridge line L1 and the second ridge line L2 are bent so that the adjacent ends of the first surface portion 40 and the second surface portion 50 are brought close to each other, and the first surface portion 40 and the second surface portion 50 are adjacent to each other. The crushing step of forming the third ridge line L3 by crushing the end portions from the outside to bring the adjacent ends into contact with each other, and the range including at least the third ridge line L3 of the first surface portion 40 and the second surface portion 50. It has a painting process to paint the outer surface.

In such a method of manufacturing the upper structure portion 20, adjacent ends of the first surface portion 40 and the second surface portion 50 arranged close to each other are crushed, so that the adjacent ends of the first surface portion 40 and the second surface portion 50 are crushed. The gap between them can be eliminated or reduced. Therefore, by painting the portion including the third ridge line L3 formed by abutting the adjacent end portions, the gap between the adjacent end portions becomes invisible, and the flat plate portion 21 and the first surface portion 40 are made invisible. And the surface of the corner portion 60 formed by the second surface portion 50 can be smoothed. Therefore, according to the present embodiment, it is possible to prevent an unnecessary gap from being generated in the corner portion 60 of the upper structure portion 20.

Further, in the method for manufacturing the upper structure portion 20 of the present embodiment, the crushing step is adjacent to the top crushing step of crushing the top 61 to which the first ridge line L1, the second ridge line L2 and the third ridge line L3 are connected. It has an end bending step of bending at least one of the portions from the outside to the inside.

According to the method of manufacturing the upper structure portion 20 of the present embodiment, the top portion 61 to which the first ridge line L1, the second ridge line L2, and the third ridge line L3 are connected is crushed, so that the corner portion 60 is crushed. It is possible to prevent the occurrence of sharp parts. Further, according to the present embodiment, since the adjacent ends of the first surface portion 40 and the second surface portion 50 are curved, the surface of the corner portion 60 can be made smoother.

Further, in the method for manufacturing the upper structure portion 20 of the present embodiment, the end bending step is performed after the top crushing step. Therefore, when the top portion 61 is crushed, it is possible to prevent the adjacent ends of the first surface portion 40 and the second surface portion 50 from being separated from each other.

Further, in the method for manufacturing the upper structure portion 20 of the present embodiment, a polishing step of polishing the outer surfaces of adjacent ends of the first surface portion 40 and the second surface portion 50 is performed after the crushing step and before the painting step. Have. Therefore, since the surfaces of the adjacent ends of the first surface portion 40 and the second surface portion 50 are polished, the surface of the corner portion 60 can be made smoother. Therefore, the surface of the corner portion 60 can be uniformly painted, and the appearance of the upper structure portion 20 can be further improved.

Further, the manufacturing method of the upper structure portion 20 of the present embodiment includes a welding step of connecting the first surface portion 40 and the second surface portion 50 after the bending step. Therefore, the first surface portion 40 and the second surface portion 50 are joined by the welding process. Therefore, it is possible to prevent the first surface portion 40 and the second surface portion 50 from being separated by external pressure, and to prevent a gap from being formed in the corner portion 60 after the start of use of the upper structure portion 20, for example.

Further, the manufacturing method of the desk 2 of the present embodiment includes a top plate forming step of forming the top plate 11 having the corners 60 by the manufacturing method of the upper structure portion 20, and a leg body 10 for supporting the top plate 11 from below. It has a leg attachment step of attaching to the top plate 11. Therefore, it is possible to manufacture a desk 2 capable of preventing an unnecessary gap from being generated in the corner portion 60 of the top plate 11.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above-described embodiment. The various shapes and combinations of the constituent members shown in the above-described embodiment are examples, and can be variously changed based on design requirements and the like without departing from the spirit of the present invention.

For example, in the above embodiment, the configuration in which the sheet metal structure is the upper structure portion 20 of the top plate 11 has been described. However, the present invention is not limited to this. It is also possible to apply the present invention to other sheet metal structures having corners and methods for manufacturing the same. For example, it is also possible to apply the present invention to a sleeve desk formed of sheet metal or a cabinet formed of sheet metal.

Further, in the above embodiment, a configuration has been described in which both the end portion 41 of the first surface portion 40 and the end portion 51 of the second surface portion 50 are crushed in the crushing step. However, the present invention is not limited to this. For example, it is also possible to adopt a configuration in which either the end portion 41 of the first surface portion 40 or the end portion 51 of the second surface portion 50 is crushed.

Further, in the above embodiment, the configuration in which the top crushing step, the polishing step, and the welding step are performed has been described. However, the present invention is not limited to this. For example, it is also possible to adopt a configuration in which any one of these steps or a plurality of steps is not performed.

1 ... Desk unit, 2 ... Desk (furniture with top plate), 10 ... Leg body (support structure), 11 ... Top plate, 11a ... Top surface, 20 ... Upper structure part (sheet metal structure), 21 ... Flat plate part (base surface part), 22 ... Peripheral wall part, 23 ... Stretched piece, 24 ... Joint part, 40 ... First surface part, 41 ... End part, 50 ... Second surface part, 51 ... ... end, 60 ... corner, 61 ... top, 70 ... sheet metal (material to be molded), L1 ... 1st ridge, L2 ... 2nd ridge, L3 ... 3rd ridge

Claims (7)

The base surface portion, the first surface portion that bends and extends from the first ridge line of the base surface portion, and the first surface portion that bends from the second ridge line adjacent to the first ridge line to the same side as the side that extends from the base surface portion. It is a method of manufacturing a sheet metal structure for manufacturing a sheet metal structure having a second surface portion extending from a plate-shaped material to be formed by sheet metal processing.
A bending step of bending the first ridge line and the second ridge line portion of the material to be molded to bring the adjacent ends of the first surface portion and the second surface portion close to each other.
A crushing step of forming a third ridge line by crushing at least one of the adjacent ends of the first surface portion and the second surface portion from the outside to bring the adjacent ends into contact with each other.
A method for manufacturing a sheet metal structure, which comprises a painting step of painting the outer surface of the first surface portion and the second surface portion for a range including at least a third ridge line. The crushing step is
A top crushing step of crushing the top to which the first ridge, the second ridge, and the third ridge are connected, and
The method for manufacturing a sheet metal structure according to claim 1, further comprising an end bending step of bending at least one of the adjacent ends from the outside to the inside. The method for manufacturing a sheet metal structure according to claim 2, wherein the end bending step is performed after the top crushing step. The sheet metal structure according to any one of claims 1 to 3, further comprising a polishing step of polishing the outer surfaces of the adjacent ends after the crushing step and before the painting step. Production method. The method for manufacturing a sheet metal structure according to any one of claims 1 to 4, further comprising a welding step for connecting the first surface portion and the second surface portion after the bending step. A top plate forming step of forming a top plate containing at least a part of the sheet metal structure by the method for manufacturing a sheet metal structure according to any one of claims 1 to 5.
A method for manufacturing a fixture with a top plate, which comprises a support structure attaching step of attaching a support structure for supporting the top plate from below to the top plate. Plate-shaped base surface and
A plate-shaped first surface portion that bends and extends from the first ridge line of the base surface portion, and
A plate-shaped second surface portion extending from the second ridge line adjacent to the first ridge line is provided on the same side as the side extending from the base surface portion.
At least one of the first surface portion and the adjacent end portions of the second surface portion is crushed from the outside to form a third ridge line.
A sheet metal structure characterized in that the outer surfaces of the first surface portion and the second surface portion are painted in a range including at least the third ridge line.

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