Molding device

Abstract

To provide a molding device capable of improving the quality of a deck plate after molding.SOLUTION: A regulating portion 62 is provided not on a first mold 40 in which a deck plate 106 is set, but on a second mold 60 that approaches the first mold 40 relatively. An inner side surface 62a of the regulating portion 62 in a width direction D2 is arranged so as to form a slight gap GP2 between itself and an outer side surface 56a of a base portion 56 of a flat plate molding portion EF2 in the width direction. Since the gap GP2 is positioned on a lower side, an influence on an upwardly bent end portion 25 is reduced. Further, formation of a gap between the regulating portion 62 and a main body portion 61 of the upper second mold 60 can be suppressed. Therefore, it is possible to avoid a situation where a gap is formed between the second mold 60 and the regulating portion 62 that relatively approach each other, and to avoid the end portion 25 of the deck plate 6 being caught in such a gap. As shown in a Fig.15(a), deformation of the end portion 25 can be suppressed.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a molding apparatus. [Background technology]

[0002] A conventional deck slab forming device is known from Patent Document 1. This deck slab forming device forms an end-closed shape by crushing one end of the deck plate in the span direction with an upper mold and a lower mold. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-40746 Summary of the Invention [Problem to be solved by the invention]

[0004] In molding devices for forming end-closed shapes, restrictors are sometimes provided at the widthwise ends of the mold to prevent the deck plate from expanding in the width direction. In this case, the end of the deck plate may become deformed by entering the gap between the mold and the restrictor. This can result in a problem of reduced quality of the formed deck plate.

[0005] The present invention has been made to solve such problems, and has an object to provide a forming device that can improve the quality of the formed deck plate. [Means for solving the problem]

[0006] The forming device of the present invention is a forming device that forms an end-closed shape by crushing one first end portion in the span direction of the deck plate with a first mold and a second mold, and the first mold and second mold have a normal forming section that forms a normal portion having a constant cross-sectional shape extending in the span direction, a flat plate forming section that forms a flat plate portion, and a transition forming section that forms a transition portion that transitions from the normal portion to the flat plate portion, and the deck plate is set in the first mold at the start of forming, and the second mold moves relative to the first mold, and the second mold is provided with a first regulating section that regulates the expansion of the second end portion in the width direction of the deck plate due to forming.

[0007] In the molding apparatus according to the present invention, a deck plate is set in the first mold at the start of molding. The second mold moves relative to the first mold. The end of the deck plate is thereby crushed between the first mold and the second mold, forming an end-closed shape. The second mold is provided with a first restricting portion that restricts the expansion of the second end of the deck plate in the width direction associated with molding. This suppresses the deck plate from expanding in the width direction associated with molding, allowing the desired shape to be obtained. Furthermore, the first restricting portion is provided not in the first mold in which the deck plate is set, but in the second mold that approaches relatively to the first mold. This prevents a gap from forming between the relatively approaching second mold and the first restricting portion, preventing the second end of the deck plate from becoming caught in the gap. As a result, the quality of the deck plate after molding can be improved.

[0008] The end-closed shape may be an inverted end-closed shape, in which case the effects of employing the above-described structure become more pronounced.

[0009] The second mold may have a first restricting portion in the flat plate molding portion, in which case the above-mentioned effect can be obtained for the flat plate portion that tends to expand in the width direction.

[0010] The deck plate has an upper flange, a lower flange, and side walls between the upper flange and the lower flange. The first mold has a second restricting portion that is positioned between the pair of side walls of the deck plate at the start of molding to restrict inward deformation of the side walls, and in the transition molding portion, the second restricting portion may contact at least a portion of the side walls at the start of molding. In the transition molding portion, the side walls are prone to inward deformation during molding. In contrast, the second restricting portion can support the side walls from the inside, thereby preventing the side walls from deforming inward during molding. This prevents the package from becoming taller due to deformation of the side walls when multiple deck plates are stacked after molding.

[0011] The second restricting portion may be larger than the upper flange in the width direction of the deck plate, in which case the second restricting portion can further suppress inward deformation of the side wall.

[0012] The side wall may have a jaw portion recessed inward, and the second restricting portion may restrict inward deformation of the jaw portion. Since the jaw portion is the portion of the side wall that is most likely to deform inward during molding, the second restricting portion may restrict deformation of that portion, thereby restricting inward deformation of the entire side wall.

[0013] The end-closed shape is formed as an inverted end-closed shape, and the first mold may have an elastic member in the normal forming section that causes the forming surface to sink as the forming process progresses. In this case, forming can be performed with the valley side facing downward. This eliminates the need to turn the deck plate upside down to set it in the forming device. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a forming device that can improve the quality of the formed deck plate. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic side view showing a reverse end-closed deck plate installed on a beam. [Figure 2] Fig. 2(a) is a cross-sectional view taken along line IIa-IIa in Fig. 1. Fig. 2(b) is a cross-sectional view taken along line IIb-IIb in Fig. 1. Fig. 2(c) is a cross-sectional view taken along line IIc-IIc in Fig. 1. [Figure 3] Fig. 3(a) is a perspective view from below of a reverse end-closed deck plate 6. Fig. 3(b) is a perspective view from above of a deck plate 106, which is the base material before molding. [Figure 4] FIG. 2 is a schematic side view of the molding device. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 illustrates a transition molding. [Figure 8] FIG. 10 illustrates a transition molding. [Figure 9] FIG. 10 is a view showing a flat plate molding part EF2. [Figure 10] FIG. 10 is a view showing a flat plate molding part EF2. [Figure 11] FIG. 10 is a cross-sectional view of a molding device according to a modified example. [Figure 12] FIG. 10 is a diagram showing details of a moving mold. [Figure 13] FIG. 10 is a cross-sectional view of a molding device according to a comparative example. [Figure 14] 10A and 10B are diagrams for explaining a gap between a restricting portion and a mold. [Figure 15] 10 is a photograph showing the state of the end of the deck plate after molding. [Figure 16] FIG. 10 is a diagram showing deck plates in a stacked state. [Figure 17] FIG. 10 is a diagram showing another end-closed shape. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0017] The forming device according to this embodiment is a device that forms an end-closed shape by forming one first end portion in the span direction of the deck plate. In this embodiment, the forming device forms an inverted end-closed shape as the end-closed shape. First, the inverted end-closed shape of the deck plate 6 will be described with reference to FIGS. 1 to 3.

[0018] FIG. 1 is a schematic side view showing an inverted end-closed deck plate 6 installed on a beam 2. FIG. 2(a) is a cross-sectional view taken along line IIa-IIa in FIG. 1. FIG. 2(b) is a cross-sectional view taken along line IIb-IIb in FIG. 1. FIG. 2(c) is a cross-sectional view taken along line IIc-IIc in FIG. 1. FIG. 3(a) is a perspective view of the inverted end-closed deck plate 6 as seen from below. FIG. 3(b) is a perspective view of the deck plate 106, which serves as the base material before forming, as seen from above.

[0019] Here, the span direction D1 and width direction D2 of the deck plate 6 will be described. The direction in which the uneven shape of the deck plate 6 extends is referred to as the span direction D1 of the deck plate 6, and the direction in which the uneven shape is aligned is referred to as the width direction D2 of the deck plate 6. In the following description, when simply referred to as the "span direction" and "width direction," these will refer to the span direction D1 and width direction D2 of the deck plate 6. The deck plate 6 has an inverted end-closed shape 22 at one end 21 in the span direction D1 where it is joined to the beam 2. The deck plate 6 has a normal portion E1, a flat portion E2, and a transition portion E3. The flat portion E2 and the transition portion E3 are provided at one end 21 (first end) of the deck plate 6 in the span direction D1. The normal portion E1 is a portion with a constant cross-sectional shape extending in the span direction D1. The flat portion E2 is a portion formed in a flat plate shape at the end 21. The transition portion E3 is a portion where the normal portion E1 transitions to the flat portion E2. The thickness a of the normal portion E1 is constant, the thickness b of the flat portion E2 is constant, and the thickness of the transition portion E3 changes from thickness a to thickness b.

[0020] FIG. 2(a) corresponds to a cross section of the normal portion E1. FIG. 2(b) corresponds to a cross section of the transition portion E3. FIG. 2(c) corresponds to a cross section of the flat portion E2. As shown in FIGS. 2(a) and 2(b), the deck plate 6 has alternating peaks 6a and valleys 6b in the width direction D2. The peaks 6a are arranged to protrude upward from the bottom surfaces of the valleys 6b. The peaks 6a extend parallel to each other in the span direction D1, spaced apart from each other in the width direction D2. The peaks 6a form both side walls of the valleys 6b. The cross-sectional shape of the normal portion E1 is constant in the span direction D1, as shown in FIG. 2(a). The cross-sectional shape of the transition portion E3 is not constant, as shown in FIG. 2(b), and the height of the peaks 6a decreases toward the flat portion E2 in the span direction D1. The cross-sectional shape of the flat plate portion E2 is constant in the span direction D1 as shown in FIG. 2(c).

[0021] The shape of the end of the deck plate 6 will be described with reference to FIG. 3(a). The normal portion E1 and transition portion E3 of the deck plate 6 have a horizontally extending upper flange 26 that forms the upper surface of the upper flange 26. The upper flange 26 is flush with the flat-plate-shaped joint portion 28 that forms the flat portion E2. The joint portion 28 is placed on and fixed to the upper surface of the beam 2 (see FIG. 1). The normal portion E1 and transition portion E3 of the deck plate 6 have a horizontally extending lower flange 27 that forms the lower surface of the peak portion 6a. The normal portion E1 and transition portion E3 of the deck plate 6 have side walls 29 that extend upward from the end of the lower flange 27 in the width direction D2 and connect to the end of the upper flange 26 in the width direction D2. At the transition portion E3, the leading ends of the pair of side walls 29 and the lower flange 27 in the span direction D1 are closed by an inclined portion 30. The inclined portion 30 slopes upward as it approaches the joint portion 28 of the flat portion E2. The inclined portion 30 extends to the joint 28 of the upper flange 26. The side wall 29 may have a jaw portion 31 recessed inward at a midpoint in the vertical direction (see FIG. 2(a)).

[0022] As shown in Figure 3(b), the deck plate 106, which is the base material before forming, has an open shape 24 at one end 21. The open shape 24 is a shape that opens at the tip in the span direction D1 while maintaining the cross-sectional shape of the normal portion E1 at the tip.

[0023] Next, the molding apparatus 100 according to this embodiment will be described with reference to FIGS. 4 to 10. FIG. 4 is a schematic side view of the molding apparatus 100. FIG. 4(a) shows the molding apparatus 100 at the start of molding. FIG. 4(b) shows the molding apparatus 100 at the completion of molding. FIGS. 5 and 6 are cross-sectional views showing the normal molding section EF1. FIG. 5 shows the state at the start of molding, immediately before deformation of the deck plate 106 begins as the deck plate 106 is pressed against the second mold 60. FIG. 6 shows the state at the completion of molding. FIGS. 7 and 8 are cross-sectional views showing the transition molding section EF3. FIG. 7 shows the state at the start of molding, immediately before deformation of the deck plate 106 begins as the deck plate 106 is pressed against the second mold 60. FIG. 8 shows the state at the completion of molding. FIGS. 9 and 10 are cross-sectional views showing the plate molding section EF2. FIG. 9 shows the state at the start of molding, immediately before deformation of the deck plate 106 begins as the deck plate 106 is pressed against the second mold 60. FIG. 10 shows the state when molding is completed.

[0024] As shown in FIG. 4 , the forming apparatus 100 forms an end-closed shape (here, an inverse end-closed shape 22) by compressing one end 21 in the span direction D1 of the deck plate 106, which is the base material, with a first mold 40 and a second mold 60. In this embodiment, the upper second mold 60 is a movable mold that moves up and down. The lower first mold 40 is a fixed mold that does not have a movement mechanism using a drive unit. However, the first mold 40 and the second mold 60 only need to move relative to each other, and the first mold may be driven instead of or in addition to the second mold 60. The first mold 40 is a mold into which the deck plate 106, which is the base material, is set at the start of forming. The first mold 40 is disposed on a base 41 provided below. The second mold 60 is a mold that moves reciprocally relative to the first mold 40 in which the deck plate 106 is set.

[0025] The first mold 40 and the second mold 60 have a normal molding section EF1, a flat plate molding section EF2, and a transition molding section EF3. The normal molding section EF1 is a section that molds the normal section E1 of the deck plate 6. The flat plate molding section EF2 is a section that molds the flat plate section E2 of the deck plate 6. The transition molding section EF3 is a section that molds the transition section E3 of the deck plate 6.

[0026] The second mold 60 has a normal molding portion EF1, a flat molding portion EF2, and a transition molding portion EF3 each having a structure similar to that of the others.

[0027] The first mold 40 has a movable mold 42 in the normal molding section EF1. The movable mold 42 is a mold that moves downward as molding progresses. The upper surface of the movable mold 42 forms a molding surface 42a for maintaining the shape of the normal section E1 of the deck plate 6. The first mold 40 has an elastic member 43 in the normal molding section EF1 that causes the molding surface to sink as molding progresses.

[0028] The first mold 40 has a fixed mold 44 in the flat mold portion EF2 and the transition mold portion EF3. The fixed mold 44 is a mold fixed to the base 41. The upper surface of the fixed mold 44 forms a molding surface for molding the flat portion E2 and the transition portion E3. Specifically, the fixed mold 44 has a molding surface 44a for molding the inclined portion 30 of the transition portion E3. The fixed mold 44 also has a molding surface 44b for molding the flat portion E2.

[0029] As shown in FIG. 5, the movable mold 42 of the normal molding section EF1 includes a base portion 51 and a restricting portion 52. The base portion 51 is a plate-like member extending horizontally. An elastic member 43 is provided between the lower surface of the base portion 51 and the base 41. The restricting portion 52 is provided on the upper surface of the base portion 51. The restricting portion 52 is disposed within the ridge portion 6a, thereby restricting inward deformation of the ridge portion 6a in the width direction D2 and the up-down direction. At the start of molding, the side wall 29 and the upper flange 26 are disposed so as to be in approximate contact with the outer surface of the restricting portion 52. At the start of molding, the lower flange 27 is disposed so as to be in approximate contact with the upper surface of the base portion 51. The molding surface 42a is formed by the upper surface of the base portion 51 and the outer surface of the restricting portion 52. The main body 61 of the second mold 60 is provided with a pressing portion 64 that extends downward from the underside of the main body 61 and presses down on the valley portions 6b of the deck plate 106 from above. In this embodiment, the deck plate 106 has three valley portions 6b, and therefore the main body 61 has three pressing portions 64 at positions corresponding to these valley portions 6b. As the second mold 60 is lowered, the movable mold 42 sinks downward together with the deck plate 106. As shown in FIG. 6 , upon completion of molding, the normal portion E1 of the deck plate 6 maintains the original shape of the deck plate 106. Note that deformation accompanying deformation of the transition portion E3 is restricted by the restricting portion 52 and the pressing portion 64.

[0030] As shown in FIG. 7 , the transition molding section EF3 includes a fixed mold 44 and a movable mold 46. The fixed mold 44 includes a base portion 53. The base portion 53 is a plate-like member extending horizontally on the base 41. The movable mold 46 is disposed inside the ridge portion 6a and supports the upper flange 26. An elastic member 49 is provided between the lower surface of the movable mold 46 and the base 41. The movable mold 46 is disposed so as to be sandwiched between the base portion 53 on both sides in the width direction D2. The movable mold 46 is disposed between the pair of side walls 29 at the start of molding, thereby restricting inward deformation of the side walls 29 in the width direction D2. In the transition molding section EF3, the movable mold 46 may contact at least a portion of the side walls 29 at the start of molding. The movable mold 46 may also restrict inward deformation of the jaws 31. In this embodiment, the outer surface of the movable mold 46 is capable of abutting against the jaws 31 of the side walls 29. At the start of molding, the side wall 29 is positioned so as to be in approximate contact with the outer surface of the movable mold 46. At the start of molding, the lower flange 27 is positioned so as to be in approximate contact with the upper surface of the base portion 53. In the transition molding portion EF3, the main body portion 61 of the second mold 60 is also provided with a pressing portion 65 that presses down on the valley portion 6b of the deck plate 106 from above. However, the pressing portion 65 of the transition molding portion EF3 is shorter than the pressing portion 64 of the normal molding portion EF1. Therefore, at the start of molding, the pressing portion 65 is not in contact with the valley portion 6b.

[0031] The inclined forming surface 44a (see FIG. 4) is formed by the upper surface of the base portion 53. The upper surface of the base portion 53 (i.e., the inclined forming surface 44a) is positioned at the same height as the upper surface of the base portion 51 (see FIG. 6) at the boundary with the normal forming portion EF1. The upper surface of the base portion 53 extends diagonally upward from the normal forming portion EF1 toward the plate forming portion EF2. The upper surface of the base portion 53 is positioned at the same height as the upper surface of the base portion 51 at the boundary with the plate forming portion EF2 at the same height as the upper surface of the base portion 51 at the completion of forming. As the second mold 60 is lowered, the movable mold 46 sinks downward together with the deck plate 106. As shown in FIG. 8, the transition portion E3 of the deck plate 6 at the completion of forming is formed so that the depth of the valley portions 6b is shallower than that of the original deck plate 106. Movement of the peak portions 6a in the width direction D2 is restricted by the movable mold 46. Furthermore, when molding is completed, the pressing portion 65 presses the valley portion 6b between the base portion 53. As described above, the movable mold 46 is disposed between the pair of side walls 29 of the deck plate 106 at the start of molding, and functions as a restricting portion (second restricting portion) that restricts the side walls 29 from deforming inward.

[0032] As shown in FIG. 9 , the flat plate molding section EF2 includes a fixed mold 44 and a movable mold 47. The fixed mold 44 includes a base portion 56. The base portion 56 is a plate-like member extending horizontally on the base 41. The movable mold 47 is disposed inside the ridge portion 6a and supports the upper flange 26. An elastic member 48 is provided between the lower surface of the movable mold 47 and the base 41. The movable mold 47 is the same as the movable mold 46 of the transition molding section EF3. At the start of molding, the lower flange 27 is positioned so as to be in substantial contact with the upper surface of the base portion 56. The molding surface 44b is formed by the upper surface of the base portion 53 and the upper surface of the movable mold 47. In the flat plate molding section EF2, the main body portion 61 does not include a retainer portion 64. As the second mold 60 is lowered, the movable mold 47 sinks downward together with the deck plate 106. As shown in FIG. 10, when forming is completed, the flat plate portion E2 of the deck plate 6 has the peaks 6a and valleys completely crushed.

[0033] As shown in FIGS. 5 to 10 , the second mold 60 is provided with restricting portions 62 (first restricting portions) that restrict the expansion of the end portion 25 (second end portion) of the deck plate 6 in the width direction D2 during molding. The restricting portions 62 are provided at both ends of the flat plate-shaped main body portion 61 of the second mold 60 in the width direction D2. Each restricting portion 62 extends downward from both ends of the main body portion 61 in the width direction D2. In this embodiment, each restricting portion 62 is provided throughout the normal molding portion EF1, the transition molding portion EF3, and the flat plate molding portion EF2. However, the deck plate 6 in the width direction D2 during molding is largest in the flat plate molding portion EF2. Therefore, it is sufficient for the second mold 60 to have restricting portions 62 at least in the flat plate molding portion EF2.

[0034] The structure of the lower fixed mold is not limited to the above-described embodiment and may be modified as appropriate. For example, the movable molds 46, 47 may be those shown in FIG. 12. As shown in FIG. 12, the movable molds 46, 47 are larger than the upper flange 26 in the width direction D2. Furthermore, the movable molds 46, 47 come into contact with the jaw portion 31, thereby restricting inward deformation of the jaw portion 31. The movable molds 46, 47 come into contact with the upper flange 26.

[0035] Next, the operation and effect of the molding device 100 according to this embodiment will be described.

[0036] In the molding apparatus 100 according to this embodiment, a deck plate 106 is set in the first mold 40 at the start of molding. The second mold 60 moves relative to the first mold 40. As a result, the end 21 of the deck plate 106 is crushed by the first mold 40 and the second mold 60, thereby forming an inverted end-closed shape 22. Here, the second mold 60 is provided with a restricting portion 62 that restricts the expansion of the end 25 of the deck plate 106 in the width direction D2 that occurs during molding. This prevents the deck plate 6 from expanding in the width direction D2 that occurs during molding, allowing the desired shape to be obtained.

[0037] Here, as a comparative example, a molding apparatus shown in FIG. 13 will be described. In this molding apparatus, a restricting portion 62 is provided in the first mold 40. At this time, as shown in FIG. 14(b), a gap GP1 is formed between the inner side surface 62a of the restricting portion 62 and the outer side surface 61a of the main body portion 61 of the second mold 60. Here, if the inward deformation of the side wall 29 is restricted by the movable molds 46, 47 as shown in FIG. 13, the end portion of the formed deck plate 6 in the width direction D2 will jump upward along the restricting portion 62. At this time, the end portion 25 of the deck plate 6 will enter the gap GP1. In this case, the end portion 25 will be deformed as shown in FIG. 15(b).

[0038] In contrast, in this embodiment, as shown in FIG. 11 , the restricting portion 62 is provided not in the first mold 40 in which the deck plate 106 is set, but in the second mold 60, which is relatively close to the first mold 40. The inner side surface 62a of the restricting portion 62 in the width direction D2 is positioned so as to form a small gap GP2 with the outer side surface 56a of the base portion 56 of the flat plate molding portion EF2 in the width direction (see FIG. 14(a)). However, because the gap GP2 is positioned on the lower side, it has little effect on the protruding end portion 25. Meanwhile, the formation of a gap between the restricting portion 62 and the main body portion 61 of the upper second mold 60 can be prevented. This prevents a gap from being formed between the second mold 60, which is relatively close, and the restricting portion 62, and prevents the end portion 25 of the deck plate 6 from getting caught in the gap. Therefore, as shown in FIG. 15(a), deformation of the end portion 25 can be suppressed. As a result, the quality of the deck plate 6 after molding can be improved.

[0039] The end-closed shape may be an inverse end-closed shape 22. In this case, the effect of employing the above-described structure becomes more pronounced.

[0040] The second mold 60 may have a restricting portion 62 in the flat plate molding portion EF2. In this case, the above-described effect can be obtained for the flat plate portion E2 that tends to expand in the width direction D2.

[0041] When the deck plates 106, which serve as base materials before forming, are stacked together, the peaks and valleys of the upper and lower deck plates 106 fit together well, resulting in a low package height, as shown in Figure 16(a). On the other hand, if the peaks of the deck plate 6 after forming are significantly deformed inward at the transition section E3, they will interfere with the other deck plates 6 when stacked. In this case, the package height will be high, as shown in Figure 16(b).

[0042] In contrast, the deck plate 6 has an upper flange 26, a lower flange 27, and side walls 29 between the upper flange 26 and the lower flange 27. The first mold 40 has a movable mold 46 that is positioned between the pair of side walls 29 of the deck plate 6 at the start of molding to restrict inward deformation of the side walls 29. In the transition molding section EF3, the movable mold 46 may contact at least a portion of the side walls 29 at the start of molding. In the transition molding section EF3, the side walls 29 are prone to inward deformation during molding. In contrast, the movable mold 46 can support the side walls 29 from the inside, thereby preventing the side walls 29 from deforming inward during molding. This prevents the package from becoming taller due to deformation of the side walls 29 when multiple molded deck plates 6 are stacked together.

[0043] The movable mold 46 may be larger than the upper flange 26 in the width direction D2 of the deck plate 6. In this case, the movable mold 46 can further suppress the side wall 29 from deforming inward.

[0044] The side wall 29 has a jaw portion 31 that is recessed inward, and the movable mold 46 may restrict inward deformation of the jaw portion 31. Since the jaw portion 31 is the portion of the side wall 29 that is most likely to deform inward during molding, the movable mold 46 can restrict deformation of that portion, thereby restricting inward deformation of the entire side wall 29.

[0045] The end-closed shape is formed as an inverted end-closed shape 22, and the first mold 40 may have an elastic member 43 in the normal forming section EF1 that causes the forming surface to sink as forming progresses. In this case, forming can be performed with the valley side facing downward. This eliminates the need to turn the deck plate 106 upside down to set it in the forming device 100.

[0046] The present invention is not limited to the above-described embodiments.

[0047] In the above-described embodiment, the inverse end-closed shape 22 is exemplified as the end-closed shape formed by the forming apparatus 100. Alternatively, the forming apparatus 100 may form a normal end-closed shape 122 as the end-closed shape, as shown in FIG. 17(a). In the normal end-closed shape 122, the sloped portion slopes diagonally upward from the end. Alternatively, the forming apparatus 100 may form an intermediate end-closed shape 222 as the end-closed shape. The intermediate end-closed shape has a sloped portion 30 that slopes upward from the end and a sloped portion 30 that slopes downward from the end.

[0048] [Form 1] A forming device that forms an end-closed shape by crushing one first end portion in the span direction of a deck plate with a first mold and a second mold, The first mold and the second mold are a normal forming portion that forms a normal portion having a constant cross-sectional shape extending in the span direction; a flat plate forming section that forms a flat plate-shaped portion; a transition molding portion that molds a transition portion that transitions from the normal portion to the flat plate portion, The deck plate is set in the first mold at the start of molding, and the second mold moves relatively to the first mold, The second mold is provided with a first restricting portion that restricts expansion of the second end portion in the width direction of the deck plate that occurs during molding. [Form 2] The molding device of aspect 1, wherein the end-closed shape is an inverted end-closed shape. [Form 3] 3. The molding apparatus according to claim 1, wherein the second mold has the first regulating portion in the flat plate molding portion. [Form 4] The deck plate has an upper flange, a lower flange, and a side wall between the upper flange and the lower flange, the first mold has a second restricting portion that is disposed between the pair of side walls of the deck plate at the start of molding to restrict inward deformation of the side walls, 4. The molding device according to any one of aspects 1 to 3, wherein in the transition molding section, the second restricting section contacts at least a part of the side wall at the start of molding. [Form 5] The forming apparatus according to aspect 4, wherein the second restricting portion is larger than the upper flange in the width direction. [Form 6] the sidewall has an inwardly recessed ledge; The molding device according to aspect 4 or 5, wherein the second restricting portion restricts inward deformation of the jaw portion. [Form 7] The end-closed shape is formed as an inverted end-closed shape, 7. The molding apparatus according to any one of aspects 1 to 6, wherein the first mold has, in the normal molding section, an elastic member that causes the molding surface to sink as molding progresses. [Explanation of symbols]

[0049] 6,106...deck plate, 21...end (first end), 22...reverse end closed shape, 25...end (second end), 26...upper flange, 27...lower flange, 29...side wall, 31...jaw portion, 40...first mold, 43...elastic member, 46,47...movable mold (second regulating portion), 60...second mold, 62...regulating portion (first regulating portion), 100...molding device, E1...normal portion, E2...flat plate portion, E3...transition portion, EF1...normal molding portion, EF2...flat plate molding portion, EF3...transition molding portion.

Claims

1. A forming device that forms an end-closed shape by crushing one first end portion in a span direction of a deck plate with a first mold and a second mold, The first mold and the second mold are a normal forming portion that forms a normal portion having a constant cross-sectional shape extending in the span direction; a flat plate forming section that forms a flat plate-shaped portion; a transition molding portion that molds a transition portion that transitions from the normal portion to the flat plate portion, The deck plate is set in the first mold at the start of molding, and the second mold moves relatively to the first mold; A molding device, wherein the second mold is provided with a first restricting portion that restricts expansion of the second end portion in the width direction of the deck plate due to molding.

2. The molding device according to claim 1 , wherein the end-closed shape is an inverted end-closed shape.

3. The molding apparatus according to claim 1 , wherein the second mold has the first restricting portion in the flat plate molding portion.

4. The deck plate has an upper flange, a lower flange, and a side wall between the upper flange and the lower flange, the first mold has a second restricting portion that is disposed between the pair of side walls of the deck plate at the start of molding to restrict inward deformation of the side walls, The molding device according to claim 1 , wherein in the transition molding section, the second restricting portion contacts at least a portion of the side wall at the start of molding.

5. The molding device according to claim 4 , wherein the second restricting portion is larger than the upper flange in the width direction.

6. the sidewall has an inwardly recessed ledge; The molding device according to claim 4 , wherein the second restricting portion restricts inward deformation of the jaw portion.

7. The end-closed shape is formed as an inverted end-closed shape, The molding apparatus according to claim 1 , wherein the first mold has an elastic member in the normal molding section that causes the molding surface to sink as molding progresses.

Images