JP7389769B2 - Curved bent products and their manufacturing method - Google Patents

Description

The present invention relates to a curved bent product and a manufacturing method thereof, and more particularly to a curved bent product used for forming curved parts of steel furniture and the like and a manufacturing method thereof.

BACKGROUND ART Top plates of tables, desks, and the like are known to have a curved portion with a large radius on the outer edge (for example, Patent Documents 1, 2, and 3). A top plate having such a curved portion with a large radius is often manufactured by cutting a wooden board such as particle board into a predetermined shape including the curved portion.

Japanese Patent Application Publication No. 2003-111624 Japanese Patent Application Publication No. 2004-166937 JP2021-27863A

A top board manufactured by cutting a wooden board into a predetermined shape including a curved part has a cut-off part, so compared to a rectangular top board, the yield of material is lower and the material cost tends to increase. Moreover, productivity is also poor.

If an attempt is made to manufacture the outer edge of a steel top plate having a curved portion with a large radius by bending instead of cutting, the number of parts and man-hours will increase, resulting in poor productivity.

The problem to be solved by the present invention is to realize a curved bent product with a high material yield and excellent productivity.

A curved and bent product according to one embodiment of the present invention is a curved and bent product that includes a strip plate (12) that curves with a predetermined curvature, and the strip plate is provided at predetermined intervals in the longitudinal direction of the curve. Each slit has a plurality of slits (24), each of which has an outer end (26A) opened at the outer curved edge (D), extends in the curved radial direction, and has first end surfaces facing each other in the curved longitudinal direction. (28) and a second end surface (30); a third end surface (34) that is continuous with the first end surface at an inner end (26B) of the first slit portion; A terminal end (32D) that includes a fourth end surface (36) that is continuous with the second end surface at the inner end (26B) of the first slit portion and has a portion that abuts the third end surface, and that is closed on the curved inner edge side. The second slit portion (32) has a second slit portion (32).

According to this configuration, it is possible to realize a curved bent product with a high material yield and excellent productivity.

A curved and bent product according to one embodiment of the present invention is a curved and bent product that includes a strip plate (12) that is curved with a predetermined curvature, and the strip plate is provided at a predetermined interval in the longitudinal direction. It has a plurality of slits (24), each slit has an outer end (26A) opening at a first edge (D) that becomes a curved outer edge, and has a first end face (28) and a first end face (28) facing each other in the longitudinal direction. A first slit part (26) including two end faces (30), a third end face (34) continuous with the first end face at the inner end (26B) of the first slit part, and an inner part of the first slit part. It includes a fourth end surface (36) that is continuous with the second end surface at the end (26B) and faces the third end surface at a predetermined interval, and is closed on the side of the second edge (E) that becomes the curved inner edge. a straight line with a second slit portion (32) having a curved terminal end (32D); and the first end surface and the second end surface of each slit are curved so that the first edge portion is a curved outer edge. The distance between the third end face and the fourth end face is reduced compared to the time of the straight line state, and the distance between the third end face and the fourth end face is reduced compared to the time of the straight line state. It is deformable between a curved state in which the part of the third end face and the part of the fourth end face are in contact with each other.

According to this configuration, it is possible to realize a curved bent product with a high material yield and excellent productivity.

In the above curved and bent product, preferably, the third end surface includes an inverted surface (a) facing in a direction opposite to the first end surface, and the fourth end surface includes an opposing surface portion (b) facing the inverted surface portion. The inverted surface portion and the opposing surface portion are in contact with each other.

According to this configuration, the third end surface and the fourth end surface are reliably brought into contact.

In the curved bent product, preferably, the first slit portion extends linearly in the radial direction of the curve, the second slit portion includes a circular arc portion (32B), and the third end face of the circular arc portion and The fourth end surface is provided with the inverted surface portion and the opposing surface portion.

According to this configuration, the third end surface and the fourth end surface are reliably brought into contact with each other with a simple structure.

In the curved bent product, preferably, the slit includes a hook-shaped portion formed by the first slit portion and the second slit portion.

According to this configuration, the third end surface and the fourth end surface are reliably brought into contact with each other with a simple structure.

A curved and bent product according to one embodiment of the present invention is a curved and bent product that includes a strip plate (12) that curves with a predetermined curvature, and the strip plate has a predetermined width in the radial direction of the curve. , and a plurality of slits (24) extending in the circumferential direction, cut radially inward from the outer circumferential edge, and provided at predetermined intervals in the longitudinal direction, thereby forming a plurality of slits (24) extending radially outward. an undercut recess extending into the tooth from one side at the base of each tooth by a slit extension (32) comprising a tooth (25) and provided radially inwardly of said slit; (27), and a tongue portion (29) extending from the other side surface and projecting into the undercut recess provided in the opposing and adjacent toothed portion, the tongue portion (29) extending from the other side and protruding into the undercut recess provided in the opposing and adjacent toothed portion. The defining portion of the toothed portion and the tongue portion provided on the adjacent toothed portion are each provided with abutting surfaces (a, b) that face each other in the circumferential direction with respect to the expanding direction of the slit. .

According to this configuration, it is possible to realize a curved bent product with a high material yield and excellent productivity.

A method of manufacturing a curved bent product according to an embodiment of the present invention is a method of manufacturing a curved product by bending a linear strip-shaped plate material (40), wherein the strip-shaped plate material is bent in the longitudinal direction. first end surfaces (28) having a plurality of slits (24) provided at predetermined intervals, having an outer end (26A) opening at the first edge (D), and facing each other in the longitudinal direction; and a first slit portion (26) including a second end surface (30), a third end surface (34) that is continuous with the first end surface at an inner end (26B) of the first slit portion, and the first slit portion. A second edge opposite to the first edge, including a fourth end surface (36) that is continuous with the second end surface at an inner end (26B) and faces the third end surface at a predetermined interval. and a second slit portion (32) having a closed end (32D) on the side thereof, and the strip plate material is arranged so that the first edge becomes the curved outer edge (D). The bending process is performed while enlarging the distance between the first end surface and the second end surface and reducing the distance between a portion of the third end surface and the fourth end surface. The bending process is completed when the four end faces come into contact with the above-mentioned portions.

According to this manufacturing method, a curved bent product can be manufactured with excellent material economy and productivity.

According to the curved bent product according to the present invention, the material yield is high and excellent productivity can be obtained.

(A) is a plan view showing one embodiment of the curved bent product according to the present invention, and (B) is an end view. An enlarged perspective view of the main parts of the curved and bent product according to this embodiment (A) is an enlarged plan view of the main part of the curved bent product according to the present embodiment in a straight state, and (B) is an enlarged plan view of the main part of the curved bent product in the curved state. (A) is a developed view including a partially enlarged view of the curved bent product according to the present embodiment, and (B) is a plan view of the curved bent product according to the present embodiment in a straight state. A bottom view showing an example of application of the curved bent product according to the present embodiment to a top plate. (A) is an enlarged plan view of the main part of a curved bent product according to another embodiment in a straight state, and (B) is an enlarged plan view of the main part of the same curved bent product in a curved state. (A) is an enlarged plan view of the main part of a curved bent product according to another embodiment in a straight state, and (B) is an enlarged plan view of the main part of the same curved bent product in a curved state. (A) is an enlarged plan view of the main part of a curved bent product according to another embodiment in a straight state, and (B) is an enlarged plan view of the main part of the same curved bent product in a curved state. A bottom view showing another example of application of the curved bent product according to the present embodiment to a top plate. (A) is an enlarged plan view of the main part of a curved bent product according to another embodiment in a straight state, and (B) is an enlarged plan view of the main part of the same curved bent product in a curved state. A bottom view showing another example of application of the curved bent product according to the present embodiment to a top plate.

Hereinafter, one embodiment in which a curved bent product according to the present invention is applied to a curved member for the outer edge of a top plate will be described with reference to FIGS. 1 to 5.

FIG. 1 shows a curved member (curved and bent product) 10 for the outer edge of the top plate. The curved member for the outer edge of the top plate (hereinafter abbreviated as the curved member) 10 is made of a steel plate and stands up from a bottom piece (band-shaped plate material) 12 forming a band and one edge (curved inner edge) of the bottom piece 12. a vertical piece 14; a top piece 16 bent from the upper edge of the vertical piece 14 to face the bottom piece 12; and a hanging piece 18 bent downward from the tip edge of the top piece 16. and includes an arcuate curved portion 20 with an angle of approximately 90 degrees. In the arcuate curved portion 20, each piece has a curved band shape. The bottom piece 12 has a larger curved radial dimension than the top piece 16. The vertical dimension of the vertical piece 14 determines the vertical thickness of the top plate 100 (see FIG. 5).

The upper piece 16 and the hanging piece 18 have a plurality of upper slits 22 formed in an arcuate curved portion 20 at predetermined intervals. As shown in FIG. 2, each upper slit 22 is continuous across the upper piece 16 and the hanging piece 18, has an outer end 22A that is open toward the curved outside, and extends in the curved radial direction. It extends in a straight line. Each upper slit 22 has a closed end (inner end) 22B opposite the outer end 22A. The terminal end 22B extends at the boundary between the vertical piece 14 and the upper piece 16, spanning both parts.

The bottom piece portion 12 has a plurality of lower slits 24 formed in the arcuate curved portion 20 at predetermined intervals in the longitudinal direction of the curve. The lower slit 24 is a main component of this embodiment, and has an outer end 26A that opens at a curved outer edge (first edge) D, as shown in FIGS. 2 and 3. The first slit portion 26 extends linearly in the curved radial direction and includes a first end surface 28 and a second end surface 30 facing each other, and is continuous with the first end surface 28 at an inner end 26B of the first slit portion 26. The second slit section 32 includes a third end surface 34 and a fourth end surface 36 that is continuous with the second end surface 30 at the inner end 26B of the first slit section 26.

The second slit portion 32 includes a short straight portion 32A extending in the curved longitudinal direction from one end communicating with the inner end 26B of the first slit portion 26, and a short straight portion 32A extending approximately 180 degrees from the one end communicating with the terminal end of the straight portion 32A. A circular arc portion 32B having an angle of approximately 180 degrees (deployment angle) extending with a shape bulging toward the curved outer edge at an angle, and a straight line inclined toward the vertical piece portion 14 from one end communicating with the terminal end of the circular arc portion 32B. It has a continuous inclined linear portion 32C extending in a shape, and the other end of the inclined linear portion 32C is a closed terminal end 32D. In other words, the second slit portion 32 has a closed end 32D on the side of the second edge E, which is the curved inner edge. The terminal end 32D is expanded into a substantially circular shape and extends at the boundary between the bottom piece 12 and the vertical piece 14 (folding line A), spanning both parts. The third end surface 34 includes an inverted surface portion (a part of the third end surface 34) a facing the first end surface 28 in the circular arc portion 32B, and the fourth end surface 36 includes an opposing surface portion (a fourth (a part of the end surface 36) b.

In other words, the bottom piece portion 12 has a predetermined width in the curved radial direction, extends in the circumferential direction, is cut radially inward from the outer peripheral edge, and is provided at predetermined intervals in the longitudinal direction. The plurality of first slits 26 include a plurality of teeth 25 extending radially outward. Further, the bottom piece part 12 has a second slit part 32 that forms a slit extension part that is continuously provided inside the first slit part 26 in the radial direction, so that a tooth-shaped part 12 is formed at the base of each toothed part 25 from one side. A substantially semicircular undercut recess 27 extending into the portion 25 and a substantially semicircular undercut recess 27 extending from the other side and projecting into the undercut recess 27 provided in the opposing and adjacent toothed portion 25. It has a tongue piece part 29.

The portion of the toothed portion 25 that defines the undercut recess 27 and the tongue portion 29 provided on the adjacent toothed portion 25 each have abutment surfaces that face each other in the circumferential direction in the expansion direction of the first slit portion 26. An inverted surface portion a and a facing surface portion b are provided.

As shown in FIG. 4(A), the curved member 10 includes a linear band-shaped plate 40 formed by punching and press-forming a plurality of upper slits 22 and lower slits 24, and three parts extending parallel to each other. As shown in FIGS. 2 and 4(B), the bottom piece 12, the vertical piece 14, the top piece 16 and It is formed in a groove-shaped cross-sectional shape including a hanging piece portion 18.

By bending the strip plate material 40 so that the first edge D becomes the curved outer edge D, the vertical piece 14 is deformed into a curve, thereby forming the curved member 10 as shown in FIG. is manufactured. In this bending process, the first slit portions 26 of each upper slit 22 and each lower slit 24 are expanded.

In this bending process, paying attention to the lower slit 24, as shown in FIG. When the distance between the inverted surface portion a of the third end surface 34 and the opposing surface portion b of the fourth end surface 36 is reduced and a predetermined bending process (designed bending process) is performed, the distance between the inverted surface part a of the third end surface 34 and the opposing surface part b of the fourth end surface 36 is reduced. The opposing surface portions b come into contact with each other, and further bending is prevented. In other words, the bending process is performed until the inverted surface part a of the third end surface 34 and the opposing surface part b of the fourth end surface 36 come into contact with each other, and the bending process is finished at the point of contact, thereby achieving a predetermined bending angle. The curved member 10 having this structure is uniquely manufactured with high precision.

In summary, the curved member 10 has a plurality of lower slits 24 provided at predetermined intervals in the longitudinal direction, and each lower slit 24 has an outer end 26A opening at a first edge D that becomes a curved outer edge. a first slit portion 26 including a first end surface 28 and a second end surface 30 facing each other in the longitudinal direction; and a third end surface 34 continuous with the first end surface 28 at an inner end 26B of the first slit portion 26. and a side of the second edge E that is continuous with the second end surface 30 at the inner end 26B of the first slit portion 26, includes a fourth end surface 36 that faces the third end surface 34 at a predetermined interval, and is a curved inner edge. The first end face 28 and the second end face 30 of each lower slit 24 are curved so that the first edge D becomes a curved outer edge. When the distance between a portion of the third end surface 34 (inverted surface portion a) and a portion of the fourth end surface 36 (opposed surface portion b) is in the linear state, It is possible to deform between a curved state in which a portion of the third end surface 34 (inverted surface portion a) and a portion of the fourth end surface 36 (opposing surface portion b) are in contact with each other.

The bending angle of the bending member 10 is determined by the development range and number of the upper slit 22 and the lower slit 24, and the distance between the inverted surface portion a of the third end surface 34 and the opposing surface portion b of the fourth end surface 36 in the linear state. The distance between the inverted surface portion a of the third end surface 34 and the opposing surface portion b of the fourth end surface 36 is determined by Due to the protrusions, the size is reduced to approximately 1/2 of that of other items. This is because the lower slits 24 at both ends are connected to the straight portion, and the bending angle of this portion is approximately 1/2 of the bending angle of the other portions.

The inclined straight portion 32C extending toward the curved inner edge E of each lower slit 24 contributes to reducing the load necessary for the above-mentioned bending process. The substantially circularly expanded terminal end 32D of each lower slit 24 relieves stress concentration during the above-mentioned bending process. The terminal end 22D of each upper slit 22 extends across the boundary between the vertical piece part 14 and the upper piece part 16, and the terminal end 32D of the lower slit 24 extends between the bottom piece part 12 and the vertical piece part 16. Extending across both parts at the boundary with part 14 contributes to reducing the load required for bending press forming along folding lines A and B.

FIG. 5 shows an embodiment in which the curved member 10 is applied to a top plate 100 of furniture with a top plate. The top plate 100 is made of a steel plate and has an L shape in plan view, and the curved member 10 is used to form one curved recessed portion indicated by the symbol F. The curved member 10 includes portions extending linearly on both sides of the curved recess F. The vertical piece 14 forms an outer edge surface corresponding to the thickness of the top plate 100.

The five convex curved portions of the top plate 100 are each formed by a bent molded product 104 of a steel plate. Each linear outer edge surface 106 of the top plate 100 is formed by bending the outer edge of the top plate 100. Like the vertical piece 14, the outer edge surface 106 does not have an outer edge surface corresponding to the thickness of the top plate 100, and a resin decorative band (not shown) is attached to the outer surfaces of the vertical piece 14 and the outer edge surface 106. Ru. Note that a plurality of reinforcing beam members 108 each having a groove-shaped cross section are joined to the lower surface (back surface) of the top plate 100 at various parts.

FIG. 6 shows another embodiment of the curved member 10. In FIG. 6, parts corresponding to those in FIG. 3 are designated by the same reference numerals as those in FIG. 3, and the explanation thereof will be omitted.

In this embodiment, the arcuate portion 32B of the second slit portion 32 is expanded at an angle close to 360 degrees, and the tip of the extension portion 31 extending from the first end surface 28 toward the adjacent toothed portion 25 is curved. A substantially circular tongue portion 29 is formed on one side.

In this embodiment as well, since the tongue portion 29 and the toothed portion 25 are provided with the inverted surface portion a and the opposing surface portion b that come into contact with each other due to the bending of the bending member 10, operations and effects similar to those of the above-described embodiment can be obtained. It will be done.

FIG. 7 shows another embodiment of the curved member 10. In FIG. 7, parts corresponding to those in FIG. 3 are designated by the same reference numerals as those in FIG. 3, and the explanation thereof will be omitted.

In this embodiment, substantially semicircular tongue portions 29 are formed on the curved outer side and the curved inner side of the tip of the extension portion 31 extending from the first end surface 28 toward the adjacent toothed portion 25. has been done.

In this embodiment, the tongue portion 29 and the toothed portion 25 are provided with an inverted surface portion a and an opposing surface portion b on each of the tongue portion 29 and the toothed portion 25 on the curved outer side and the curved inner side. As a result, the load due to the contact between the inverted surface portion a and the opposing surface portion b acts on both sides of the extension portion 31, the bending moment acting on the extension portion 31 is canceled out, and the bending moment acts on the extension portion 31. There is no. As a result, in this embodiment, in addition to obtaining the same functions and effects as those of the above-described embodiment, it is possible to further obtain the effect of improving durability.

FIG. 8 shows another embodiment of the curved member 10. In FIG. 8, parts corresponding to those in FIG. 3 are designated by the same reference numerals as those in FIG. 3, and the explanation thereof will be omitted.

In this embodiment, the lower slit 24 has a hook shape formed by the first slit portion 26 and the second slit portion 32, as shown in FIG. In this embodiment as well, since the inverted surface portion a and the opposing surface portion b are provided which come into contact with each other due to the bending of the bending member 10, the same functions and effects as in the above-described embodiment can be obtained.

FIG. 9 shows another embodiment in which the curved member 10 is applied to a top plate 100 of furniture with a top plate. In FIG. 9, parts corresponding to those in FIG. 5 are designated by the same reference numerals as those in FIG. 5, and the explanation thereof will be omitted.

In this embodiment, as shown in FIG. 9, a curved member 50 is used to form a curved convex portion G at one location on the top plate 100. The curved member 50 is a press-formed product of a steel plate, and as shown in FIG. 10(A), in a straight state before being curved, a plurality of trapezoidal slits 52 that expand toward the inside of the curve extend in the longitudinal direction. are formed at predetermined intervals.

As shown in FIG. 10(B), the curved member 50 is prevented from further curving in a predetermined curved state because the opposing end surfaces 54 and 56 of the slit 52 abut each other.

As a result, the bending process is performed until the end surfaces 54 and 56 of each slit 52 come into contact with each other, and the bending process is terminated at the time of contact, so that the bending member 50 having a predetermined bending angle is uniquely accurate. Well manufactured.

FIG. 11 shows another embodiment in which the curved member 50 is applied to a top plate 100 of furniture with a top plate. In FIG. 11, parts corresponding to those in FIG. 9 are designated by the same reference numerals as those in FIG. 9, and the explanation thereof will be omitted.

In this embodiment, the curved member 50 is used to form the curved convex portions G at four locations on the top plate 100, which is rectangular in plan view.

Although the present invention has been described above with reference to its preferred embodiments, as will be easily understood by those skilled in the art, the present invention is not limited to such embodiments, and there may be no deviation from the spirit of the present invention. It can be changed as appropriate to the extent that it does not. Further, all of the constituent elements shown in the above embodiments are not necessarily essential, and can be selected as appropriate without departing from the spirit of the present invention.

10: Curved member 12: Bottom piece (band)
14: Vertical piece 16: Upper piece 18: Drooping piece 20: Arc-shaped curved part 22: Upper slit 22A: Outer end 22B: Termination 24: Lower slit (slit)
25 : Teeth-like part 26 : First slit part (slit)
26A: Outer end 26B: Inner end 27: Undercut recess 28: First end surface 28D: Terminating end 29: Tongue portion 30: Second end surface 31: Extension portion 31
32: Second slit part (slit extension part)
32A: Straight section 32B: Arc section 32C: Slanted straight section 32D: End 34: Third end surface 36: Fourth end surface 40: Band member 50: Curved member 52: Slit 54: End surface 56: End surface 100: Top plate 104: Folded Curved molded product 106: Edge 108: Reinforcement beam member A: Folding line B: Folding line C: Folding line D: Curved outer edge (first edge)
E: Curved inner edge (second edge)
F: Curved concave portion G: Curved convex portion a: Inverted surface portion (impact surface)
b: Opposing surface part (impinging surface)

Claims (7)

A curved bent product including a strip plate curved with a predetermined curvature,
The strip plate has a plurality of slits provided at predetermined intervals in the longitudinal direction of the curve,
Each slit is
a first slit portion that has an outer end that opens at the outer edge of the curve, extends in the radial direction of the curve, and includes a first end surface and a second end surface that face each other in the longitudinal direction of the curve;
A third end surface that is continuous with the first end surface at the inner end of the first slit portion, and a portion that is continuous with the second end surface and abuts the third end surface at the inner end of the first slit portion. A curved bent product comprising a second slit portion including a fourth end surface and having a terminal end closed on the curved inner edge side. A curved bent product including a strip plate curved with a predetermined curvature,
The strip plate has a plurality of slits provided at predetermined intervals in the longitudinal direction, each slit has an outer end opening at a first edge that becomes a curved outer edge, and first slits facing each other in the longitudinal direction. a first slit portion including an end surface and a second end surface; a third end surface continuous with the first end surface at an inner end of the first slit portion; and a third end surface continuous with the second end surface at an inner end of the first slit portion. and a second slit portion including a fourth end face facing the third end face at a predetermined interval and having a closed end on the side of the second edge that becomes the curved inner edge;
The first edge is curved to become a curved outer edge, the distance between the first end surface and the second end surface of each slit is expanded compared to when the slit is in the straight line state, and the distance between the third end surface and the second end surface is increased. The distance between the part of the third end face and the fourth end face is reduced compared to the straight state, and the part of the third end face is deformed between the curved state and the part of the fourth end face in contact with each other. Possible curved bending products. The third end surface includes an inverted surface portion facing in a direction opposite to the first end surface, the fourth end surface includes an opposing surface portion facing the inverted surface portion, and the inverted surface portion and the opposing surface portion abut each other. The curved and bent product according to 1 or 2. The first slit portion extends linearly in a curved radial direction, the second slit portion includes an arc portion, and the inverted surface portion and the opposing surface portion are provided on the third end surface and the fourth end surface of the arc portion. A curved bent product according to claim 3, wherein the curved bent product is provided. The curved bent product according to claim 3, wherein the slit includes a hook-shaped portion formed by the first slit portion and the second slit portion. A curved bent product including a strip plate curved with a predetermined curvature,
The strip plate has a predetermined width in the curved radial direction, extends in the circumferential direction, and has a plurality of slits cut radially inward from the outer peripheral edge and provided at predetermined intervals in the longitudinal direction. a plurality of radially outwardly extending teeth;
A slit extension provided radially inwardly of the slit allows the base of each tooth to have an undercut recess extending into the tooth from one side and an opposing recess extending from the other side. and a tongue portion protruding into the undercut recess provided in the adjacent toothed portion,
A curvature in which a portion of the toothed portion defining the undercut recess and the tongue portion provided on the adjacent toothed portion are each provided with abutting surfaces facing in the circumferential direction with respect to the expansion direction of the slit. Bending products. A method of manufacturing a curved product by bending a straight strip-shaped plate material, the method comprising:
The strip-shaped plate material has a plurality of slits provided at predetermined intervals in the longitudinal direction, has an outer end opening at the first edge, and has a first end surface and a second end surface facing each other in the longitudinal direction. a third end surface that is continuous with the first end surface at an inner end of the first slit section, and a third end surface that is continuous with the second end surface at an inner end of the first slit section; and a second slit portion including fourth end faces facing each other at a predetermined interval, and a second slit portion having a closed end on a second edge side opposite to the first edge,
The strip-shaped plate material is expanded so that the first edge becomes a curved outer edge, the distance between the first end surface and the second end surface of each slit is increased, and a portion of the third end surface and the fourth end surface are A method for manufacturing a curved bent product, wherein the bending process is performed while reducing the interval between the parts, and the bending process is completed when the part of the third end face and the part of the fourth end face come into contact with each other.

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