Method for manufacturing molded articles, molded articles, and molding members

Abstract

The challenge is to provide a manufacturing method that can suppress the detachment of cut pieces from the main body. [Solution] A molded member 10 is provided, which has an outer peripheral portion 11-14 having an inner space 17-19 that opens at the ends in the longitudinal direction and a cross-sectional shape that is twice symmetrical perpendicular to the longitudinal direction, and a pair of screw hole portions 20, 22 that are formed on the inner surface of the outer peripheral portion 11-14 extending in the longitudinal direction and facing each other in the width direction. The molded member 10 is divided into a cut piece 40 including the end 41 in the longitudinal direction and a main body 30 by cutting along a cutting surface 92 oblique to a surface 99 defined by the longitudinal direction and the width direction. The cut piece 40 is rotated 180° from its position before cutting around an axis perpendicular to the cutting surface 92, and the cut surfaces 92 of the cut piece 40 and the main body 30 are brought together to join the cut piece 40 and the main body 30.

Description

Technical Field

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[0001] The present invention relates to a method for manufacturing a molded product, a molded product, and a molding member.

Background Art

[0002] Patent Document 1 discloses a method for manufacturing a molded product. Specifically, first, the molding member is cut along a cut surface (92) that is inclined 45° with respect to the length direction of the long molding member, thereby dividing the molding member into a cut piece and a main body. Then, with the opening at the end of the cut piece facing in a direction intersecting the length direction, the cut piece and the main body are abutted, and these cut piece and the main body are joined using an adhesive. As a result of the adhesive deteriorating due to factors such as aging, wind and rain, sunlight, or temperature changes, the deterioration of the adhesive becomes a cause of the detachment of the cut piece from the main body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The problem to be solved by the present invention is to suppress the detachment of the cut piece from the main body.

Means for Solving the Problems

[0005] The reference signs shown in the following parentheses are referred to in FIGS. 1 to 5.

[0006] To solve the above problems, according to claim 1, a molded member (10) is provided which has an outer peripheral portion (11-14) having an internal space (17-19) that opens at the ends in the longitudinal direction and a cross-sectional shape that is twice symmetrical perpendicular to the longitudinal direction, and a pair of screw hole portions (20 and 22) formed on the inner surface of the outer peripheral portion (11-14) that extend in the longitudinal direction and face each other in the width direction, and a surface (99) defined by the longitudinal direction and the width direction. A method for manufacturing a molded product is provided, characterized by cutting along an oblique cutting surface (92) to divide the molded member (10) into a cut piece (40) including the end (41) in the longitudinal direction and the main body (30), rotating the cut piece (40) 180° from its pre-cutting position around an axis perpendicular to the cutting surface (92) to butt the cut surfaces (92) of the cut piece (40) and the main body (30) together, and joining the cut piece (40) and the main body (30).

[0007] According to claim 2, a method for manufacturing a molded article according to claim 1 is provided, characterized in that screws (24 and 26) are passed through the inside of the screw holes (20 and 22) of the cut piece (40) and the screws (24 and 26) are screwed into the screw holes (20 and 22) of the main body (30).

[0008] According to claim 2 as described above, the cut piece (40) is joined to the main body (30) by screws (24 and 26). Such joining by screws (24 and 26) helps to prevent the cut piece (40) from detaching from the main body (30).

[0009] According to claim 3, a method for manufacturing a molded article according to claim 1 or 2 is provided, characterized in that the cut surface (92) is oblique to the surface (99) defined by the length direction and the width direction at a 45° angle.

[0010] According to claim 4, a method for manufacturing a molded article according to claim 1 or 2 is provided, characterized in that the screw hole portions (20 and 22) are arranged offset from the intermediate surface (99) of the molded member (10) in the thickness direction.

[0011] According to claim 5, a method for manufacturing a molded article according to claim 1 or 2 is provided, characterized in that the cut surface (92) passes through the edge (43) of the molded member (10) in the thickness direction and the length direction.

[0012] According to claim 6, a method for manufacturing a molded article according to claim 1 or 2 is provided, characterized in that the cut surface (92) is oblique to the surface (99) defined by the length direction and the width direction, the cut surface (92) passes through the edge (43) of the molded member (10) in the thickness direction and the length direction, the cut piece (40) and the main body (30) are aligned in the thickness direction and the width direction, and the screw hole portions (20 and 22) are offset from the intermediate surface of the molded member (10) in the thickness direction toward the edge (43) of the molded member (10) in the thickness direction and the length direction.

[0013] According to claim 6 as described above, even if the cut piece (40) is rotated 180° from its pre-cutting position around an axis perpendicular to the cut surface (92), the size of the cut piece (40) in the thickness direction is equal to the thickness of the main body (30). The divided cut piece (40) and the main body (30) are aligned in the thickness direction and width direction, and then joined together. As a result, the finished molded product (1) is in the shape of a strip, and there is no step on the upper surface of the molded product (1), nor is there a step on the lower surface. The screw holes (20 and 22) are offset from the intermediate surface of the molded member (10) in the thickness direction towards the edge (43) of the molded member (10) in the thickness direction and length direction. Therefore, even if the cut piece (40) is rotated 180° from its pre-cutting position around an axis perpendicular to the cut surface (92), the screws (24, 26) can be passed through the screw holes (22, 20) of the cut piece (40) and their tips will be securely screwed into the screw holes (20, 22) of the main body (30).

[0014] According to claim 7, a molded article (1) comprising a molded member body (30) and an end member (40) joined thereto, wherein the molded member body (30) has an internal space (17-19) that opens at the end in the longitudinal direction and a first outer peripheral portion (11-14) having a cross-sectional shape that is twice symmetrical perpendicular to the longitudinal direction, and a pair of first screw hole portions (20 and 22) formed on the inner surface of the first outer peripheral portion (11-14) that extend in the longitudinal direction and are opposite in the width direction, and the end face of the molded member body (30) in the longitudinal direction is oblique to a plane defined by the longitudinal direction and the width direction, and the longitudinal direction is around an axis perpendicular to the end face (92) of the molded member body (30) A molded product (1) is provided, having a second outer periphery having a second internal space that opens at the end in the second longitudinal direction rotated by 180°, and a pair of second screw hole portions formed on the inner surface of the second outer periphery extending in the second longitudinal direction and facing each other in the width direction, wherein the cross-sectional shape of the second outer periphery perpendicular to the second longitudinal direction is the same as the cross-sectional shape of the first outer periphery (11-14), the end face of the end member (40) in the second longitudinal direction is oblique to a plane defined by the second longitudinal direction and the width direction, and the end face of the end member (40) abuts against the end face of the molded member body (30) so that the end member (40) is joined to the molded member body (30).

[0015] According to claim 8, the molded article according to claim 7 is provided, characterized in that it comprises screws (24 and 26) that are passed through the inside of the second screw hole portions (22 and 20) and screwed into the first screw hole portions (20 and 22).

[0016] According to claim 8 as described above, the end member (40) is joined to the molded member body (30) by screws (24 and 26). Such joining by screws (24 and 26) contributes to preventing the end member (40) from detaching from the molded member body (30).

[0017] According to claim 9, there is provided a molding member (10) comprising: an outer peripheral portion (11 - 14) having an internal space (17 - 19) that opens at an end in the longitudinal direction and having a two-fold symmetric cross-sectional shape orthogonal to the longitudinal direction; and a pair of screw hole portions (20 and 22) formed to extend in the longitudinal direction on the inner surface of the outer peripheral portion (11 - 14) and facing each other in the width direction.

Advantages of the Invention

[0018] The manufacturing method contributes to preventing the detachment of the cut piece from the main body.

Brief Description of the Drawings

[0019] [Figure 1] FIG. 1 is a perspective view of the molding member. [Figure 2] FIG. 2 is a front view of the molding member. [Figure 3] FIG. 3 is for explaining the joining of the cut piece to the main body. [Figure 4] FIG. 4 is a side view of the molded product. [Figure 5] FIG. 5 is a side view of the molded product of the modified example.

Embodiments for Carrying Out the Invention

[0020] [[ID=3*]]Hereinafter, embodiments will be described with reference to the drawings. The features and technical effects of the embodiments will be understood from the following detailed description and the drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. Since the drawings are provided for illustrative purposes only, the scope of the present invention is not limited to the illustrations in the drawings.

[0021] <1. Molding Member> Figure 1 is a perspective view of the molded member 10. The molded member 10 is an extruded material produced by extrusion molding using an extrusion molding machine. The main components of the molded member 10 are polyethylene resin (PE), polypropylene resin (PP), polybutylene terephthalate resin (PBT), polyethylene terephthalate resin (PET), polyvinyl chloride resin (PVC), polystyrene resin (PS), acrylonitrile-butadiene-styrene copolymer resin (ABS), acrylonitrile-styrene copolymer resin (AS), acrylic resin (PMMA), polyamide resin (PA), polyacetal resin (POM), and polyphenylene ether resin (PPE). The material is a thermoplastic resin such as ultra-high molecular weight polyethylene resin (UHMW-PE), polycarbonate resin (PC), polyphenylene sulfide resin (PPS), polyetheretherketone (PEEK), polyimide resin (PI), liquid crystal polymer (LCP), fluororesin, polyarylate resin (PAR), polysulfone resin (PSU), polyetheresulfone resin (PES), polyamide resin (PAI), polyetherimide resin (PEI), or thermoplastic polyurethane resin. The entire component of the molded member 10 may be a thermoplastic resin. The thermoplastic resin may be a foamed resin having a large number of microcavities. By adding cellulose-based fine powder such as wood powder to the thermoplastic resin, the molded member 10 may be a wood-like molded material having a texture similar to natural wood. Wood powder from waste materials may be used as the cellulose-based fine powder. The cellulose-based fine powder may be uniformly dispersed in the thermoplastic resin or heterogeneously dispersed in the thermoplastic resin. The molded member 10 may be colored by adding a coloring agent, pigment, or dye to the thermoplastic resin. The molded member 10 may have a single color if the coloring agent, pigment, or dye is uniformly dispersed in the matrix phase. The molded member 10 may have a pattern on its surface if the coloring agent, pigment, or dye is non-uniformly dispersed in the matrix phase and the coloring agent, pigment, or dye is exposed on the surface of the molded member 10. The pattern may be, for example, a striped pattern or a straight grain pattern. The matrix phase may be a thermoplastic resin alone, a mixture of a thermoplastic resin and cellulose-based fine powder, a mixture of a thermoplastic resin, cellulose-based fine powder and pigment, or a mixture of a thermoplastic resin, cellulose-based fine powder and pigment.A coloring agent refers to a thermoplastic resin that has been colored with a pigment or dye. The molded member 10 may be an extruded aluminum material instead of an extruded resin material.

[0022] The molded member 10 has the outer shape of a strip. The molded member 10 has a length in the front-to-back direction, a width in the left-to-right direction, and a thickness in the up-to-down direction, and has a rectangular outer shape along a cross section parallel to the left-to-right and up-to-down directions. Here, the front-to-back direction, the left-to-right direction, and the up-to-down direction are orthogonal to each other. The up-to-down direction does not necessarily mean the vertical direction. Hereafter, the front-to-back direction will also be called the length direction, the left-to-right direction will also be called the width direction, and the up-to-down direction will also be called the thickness direction. The length direction is the direction in which the molded member 10 is extruded by the extrusion molding machine.

[0023] The molded member 10 has an outer periphery extending in the longitudinal direction, and the outer periphery has left and right side plates 11, 12 and upper and lower webs 13, 14. The side plates 11, 12 are spaced apart in the width direction and are parallel to each other. The side plates 11, 12 are parallel to each other in the longitudinal and thickness directions. The webs 13, 14 are spaced apart in the thickness direction and are parallel to each other. The webs 13, 14 are parallel to each other in the longitudinal and width directions. The upper web 13 is provided between the upper ends of the side plates 11, 12, and the lower web 14 is provided between the lower ends of the side plates 11, 12. The molded member 10 has an internal space enclosed by the side plates 11, 12 and the webs 13, 14. The internal space extends from one end to the other of the molded member 10 in the longitudinal direction. The internal space opens at one end and the other end of the molded member 10.

[0024] The molded member 10 has two partition walls 15 and 16 on its inside, parallel to the length and thickness directions. The side plate 11, partition wall 15, partition wall 16, and side plate 12 are arranged at equal intervals in the left-right direction. The partition walls 15 and 16 rise from the lower web 14 and extend to the upper web 13. The partition walls 15 and 16 extend in the length direction from one end to the other of the outer periphery, and the internal space enclosed by the outer periphery is divided into three hollows 17 to 19 by these partition walls 15 and 16. The hollows 17 to 19 open at one end and the other end of the molded member 10. The partition walls 15 and 16 contribute to improving the strength of the molded member 10.

[0025] The molded member 10 has left and right screw hole portions 20 and 22 formed on the inner surfaces of the side plates 11 and 12, respectively. The screw hole portions 20 and 22 protrude inward from the inner surfaces of the side plates 11 and 12, and extend longitudinally along the inner surfaces of the side plates 11 and 12, respectively. The screw hole portions 20 and 22 are cylindrical in shape. The screw hole portion 20 has a slit 21 cut out from the outer circumference to the inside, and the screw hole portion 22 has a slit 23 cut out from the outer circumference to the inside. The slits 21 and 23 extend longitudinally. The shape of the screw hole portions 20 and 22 in a cross-section parallel to the longitudinal and width directions is C-shaped. Note that the slits do not necessarily have to be formed in the screw hole portions 20 and 22.

[0026] The screw holes 20 and 22 are positioned closer to one of the webs 14 than the intermediate surface 99 between the upper and lower surfaces of the outer periphery. The intermediate surface 99 is parallel to the upper and lower surfaces of the outer periphery, and the distance from the intermediate surface 99 to the upper surface of the outer periphery is equal to the distance from the intermediate surface 99 to the lower surface of the outer periphery. The upper and lower surfaces of the outer periphery are parallel to the plane defined by the length and width directions, and perpendicular to the thickness direction. The upper surface of the outer periphery is the upper surface of the web 13, and the lower surface of the outer periphery is the lower surface of the web 13.

[0027] The outer periphery of the molded member 10 is symmetric with respect to the intermediate surface 99. The cross-sectional shape of the outer periphery is twofold symmetric. The combination of the outer periphery and the partition walls 15 and 16 is symmetric with respect to the intermediate surface 99. The cross-sectional shape of this combination is twofold symmetric. Here, the cross-sectional shape refers to the cross-sectional shape on a plane perpendicular to the length direction. Furthermore, when n is an integer of 2 or more, the property that a cross-sectional shape overlaps with its own shape when rotated (360 / n)° around its center is called nfold symmetry.

[0028] <2. Method for manufacturing molded products> The molded member 10 is divided into the main body 30 and the cut piece 40 by cutting along the cut surface 92. The cut surface 92 is oblique to the plane defined by the length direction and the width direction at a 45° angle. The cut surface 92 intersects the upper surface of the web 13 at an angle at a position away from the edge 42 of the web 13 in the length direction. Specifically, the cut surface 92 intersects the web 13 at a 45° angle at a position at a distance from the edge 42 of the web 13 corresponding to the thickness of the molded member 10. The cut surface 92 intersects the web 14 at the edge 43 of the molded member 10 in the length direction and the thickness direction, that is, at the edge 43 of the web 14 in the length direction. The cut surface 92 is perpendicular to the side plates 11 and 12.

[0029] As shown in Figures 3 and 4, the cut piece 40 is rotated 180° from its pre-cutting position around an axis perpendicular to the cut surface 92 of the cut piece 40. As a result, the length direction of the cut piece 40 becomes the length direction of the main body 30 rotated 180° around an axis perpendicular to the cut surface of the cut piece 40. The length direction of the rotated cut piece 40 is called the second length direction. Because the cross-sectional shape of the outer circumference of the molded member 10 is 2 times symmetrical, the cross-sectional shape of the outer circumference of the cut piece 40 perpendicular to the second length direction is the same as the cross-sectional shape of the outer circumference of the main body 30 perpendicular to the length direction. Because the cross-sectional shape of the combination of the outer circumference of the molded member 10 and the partition walls 15,16 is 2 times symmetrical, the cross-sectional shape of the combination of the outer circumference of the cut piece 40 perpendicular to the second length direction and the partition walls 16,15 is the same as the cross-sectional shape of the combination of the outer circumference of the main body 30 perpendicular to the length direction and the partition walls 15,16. The rotation of the cut piece 40 as described above reverses the left and right sides of the cut piece 40 and changes the orientation of the end face 41 of the cut piece 40 from the length direction to the thickness direction. The cut surface 92 of the cut piece 40 is one end face of the cut piece 40 in the second length direction, and the other end face is the end face 41. The cut surface 92 of the main body 30 is the end face of the main body 30 in the length direction. After the cutting piece 40 has been rotated, the cut surface 92 of the cutting piece 40 is brought into contact with the cut surface 92 of the main body 30. At this time, the cutting piece 40 and the main body 30 are aligned in the thickness and width directions. That is, the side surface of the cutting piece 40 is made flush with the side surface of the main body 30, and the end surface 41 of the cutting piece 40 is made flush with the surface of the web 13 of the main body 30. Here, the hollows 17, 18, and 19 of the cutting piece 40 are open at the end surface 41.

[0030] Next, screws 24 and 26 are inserted into the screw holes 22 and 20 of the cut piece 40, respectively, and then screwed into the screw holes 20 and 22 of the main body 30, respectively. The diameters of screws 24 and 26 are smaller than the inner diameters of the screw holes 22 and 20 of the cut piece 40, so screws 24 and 26 are only inserted into the screw holes 22 and 20 of the cut piece 40 and do not engage with the screw holes 22 and 20. Screws 24 and 26 engage with the screw holes 20 and 22 of the main body 30. The joining piece 40, joined to the main body 30 by screws 24 and 26 in this way, is used as an end member of the molded product 1.

[0031] The other end may be processed in the same way. This completes the molded product 1.

[0032] Furthermore, when cutting the molded member 10, the cut surface 92 may intersect the web 13 at a 45° angle at a position further away from the edge 42 of the web 13 than the distance corresponding to the thickness of the molded member 10. In this case, the cut surface 92 intersects the web 14 at a 45° angle at a position far from the edge 43 of the web 14 in the longitudinal direction. Therefore, as shown in Figure 5, in the finished molded product 1, the cut piece 40 protrudes from the web 13 in a direction perpendicular to the web 13.

[0033] <3. Applications of molded products> The molded product 1 may be used, for example, as flooring material. A floor is constructed by laying multiple molded products 1 along a horizontal plane with the web 13 of the main body 30 and the end faces 41 of the cut pieces 40 facing downward in the vertical direction. The floor may be installed indoors or outdoors of a building. The floor may be, for example, a balcony, terrace, corridor, entrance hall, or entrance floor.

[0034] The molded product 1 may be used as a fence. A fence is constructed by arranging multiple molded products 1 along a vertical plane with the web 13 of the main body 30 and the end faces 41 of the cut pieces 40 facing horizontally.

[0035] The molded product 1 may be used as a louver slat or shelf.

[0036] <4. Summary> (1) The cut piece 40 is joined to the main body 30 by screws 24 and 26. This joining with screws 24 and 26 helps to prevent the cut piece from detaching from the main body.

[0037] (2) The cut surface 92 is oblique to a plane perpendicular to the thickness direction, for example, the intermediate surface 99, at a 45° angle. Furthermore, the cut surface 92 passes through the edge 43 of the molded member 10 in the thickness direction and the length direction. Therefore, even if the cut piece 40 is rotated 180° from its pre-cutting position around an axis perpendicular to the cut surface 92, the size of the cut piece 40 in the thickness direction is equal to the thickness of the main body 30. Thus, the finished molded product 1 is in the shape of a strip, and no steps are created on the upper surface of the molded product 1, nor on the lower surface.

[0038] (3) The divided cut pieces 40 and the main body 30 are aligned in the thickness direction and width direction, and then joined together. As a result, the finished molded product 1 is in the shape of a strip, and there are no steps on the top surface of the molded product 1, no steps on the bottom surface, no steps on the left side, and no steps on the right side.

[0039] (4) The side plates 11, partitions 15, partitions 16, and side plates 12 of the molded member 10 are arranged at equal intervals in the left-right direction. Even if the cut piece 40 is rotated 180° from its pre-cutting position around an axis perpendicular to the cut surface 92, the hollow 17 of the cut piece 40 becomes continuous with the hollow 19 of the main body 30, the hollow 19 of the cut piece 40 becomes continuous with the hollow 17 of the main body 30, and the hollow 18 of the cut piece 40 becomes continuous with the hollow 18 of the main body 30. Furthermore, the hollow 18 of the main body 30 does not connect to the hollows 17 and 19 of the cut piece 40, and the hollow 18 of the cut piece 40 does not connect to the hollows 17 and 19 of the main body 30. Therefore, even if water penetrates the inside of the molded product 1, the water is easily drained.

[0040] (5) The screw holes 20 and 22 are offset from the intermediate surface 99 toward the lower web 14. Therefore, when the cut piece 40 is rotated 180° from its pre-cutting position around an axis perpendicular to the cutting surface 92, the end portion of the screw hole portion 20 of the main body 30 is directly below the screw hole portion 22 of the cut piece 40, and the end portion of the screw hole portion 22 of the main body 30 is directly below the screw hole portion 20 of the cut piece 40. Therefore, when a screw 24 is passed through the screw hole portion 22 of the cut piece 40, the tip of the screw 24 is securely screwed into the screw hole portion 20 of the main body 30. When a screw 26 is passed through the screw hole portion 20 of the cut piece 40, the tip of the screw 26 is securely screwed into the screw hole portion 22 of the main body 30.

[0041] (6) The diameters of the screws 24 and 26 are smaller than the inner diameters of the screw holes 22 and 20 of the cut piece 40, so the screws 24 and 26 do not engage with the screw holes 22 and 20 of the cut piece 40. This makes it easy to tighten the screws 24 and 26 with low torque and prevents damage to the screw holes 22 and 20 of the cut piece 40.

[0042] (7) The screw holes 22 and 20 of the cut piece 40 function as guides to lead the screws 24 and 26 into the screw holes 20 and 22 of the main body 30. The screw holes 22 and 20 of the cut piece 40 function as locking parts that catch on the heads of the screws 24 and 26.

[0043] (8) The cut pieces 40 are cut out from the molded member 10. The cut pieces 40 are used as covering material to cover the openings of the hollows 17-19 of the main body 30. Therefore, there is no need to prepare a covering material separately from the molded member 10, and the covering material can be easily obtained.

[0044] (9) The molded member 10 may be formed by mixing cellulose-based fine powder, thermoplastic resin, and pigment, and then melting and molding this mixed material. A molded product 1 manufactured from such a molded member 10 has a wood-like texture, and the surface pattern of the molded product 1 is a wood grain pattern that is very similar to that of wood. If the diameter of the cellulose-based fine powder is 1 to 100 μm, the cellulose-based fine powder does not form ciliary protrusions on the surface of the molded product 1, so the molded product 1 has waterproof and rot-resistant properties.

[0045] (10) When the molded product 1 is used as flooring material, the openings of the hollows 17-19 of the cut pieces 40 are directed vertically downward. Therefore, water can be effectively drained from the inside of the molded product 1.

[0046] (11) The energy used from the production to the disposal of wood is less than the energy used from the production to the disposal of metal or concrete materials. Therefore, if wood flour is used as cellulosic fine powder, molded product 1 will contribute to the realization of a decarbonized society by promoting carbon neutrality, which will result in virtually zero carbon dioxide emissions, and to the achievement of the Sustainable Development Goals (SDGs).

[0047] (12) The embodiments disclosed herein are for illustrative purposes only and are not intended to limit the scope of the invention. The scope of the invention should be interpreted by the terms of the claims. [Explanation of Symbols]

[0048] 1 Molded product 10 Molded member 11,12 Side panels 13,14 Web 17~19 hollow 20,22 Screw hole section 24,26 Bis 30 Main Unit 40 Cut pieces (end members) 92 Cut surface 99 Intermediate surface

Claims

1. A molded member having an outer periphery having an internal space that opens at the end in the longitudinal direction and a cross-sectional shape that is twice symmetrical perpendicular to the longitudinal direction, and a pair of screw holes formed on the inner surface of the outer periphery extending in the longitudinal direction and facing each other in the width direction, is cut along a cutting plane oblique to the plane defined by the longitudinal direction and the width direction, thereby dividing the molded member into a cut piece including the end in the longitudinal direction and the main body. The cut piece is rotated 180° from its pre-cutting position around an axis perpendicular to the cut surface, and the cut surfaces of the cut piece and the main body are brought into contact, thereby joining the cut piece and the main body. A method for manufacturing molded articles, characterized by the following:

2. Insert the screw through the inside of the screw hole in the cut piece and screw the screw into the screw hole in the main body. A method for manufacturing a molded article as described in claim 1.

3. The cross-section is oblique to the surface defined by the length direction and the width direction at a 45° angle. A method for manufacturing a molded article according to claim 1 or 2.

4. The screw hole portion is positioned offset from the intermediate surface of the molded member in the thickness direction. A method for manufacturing a molded article according to claim 1 or 2.

5. The aforementioned cut surface passes through the edges of the molded member in the thickness direction and the length direction. A method for manufacturing a molded article according to claim 1 or 2.

6. The aforementioned cross-section is oblique to the surface defined by the length direction and the width direction at a 45° angle. The aforementioned cut surface passes through the edges of the molded member in the thickness direction and the length direction, The cut piece and the main body are aligned in the thickness direction and the width direction, The screw hole portion is positioned offset from the intermediate surface of the molded member in the thickness direction toward the edge of the molded member in both the thickness direction and the length direction. A method for manufacturing a molded article according to claim 1 or 2.

7. A molded product comprising a molded member body and an end member joined thereto, The aforementioned molded member body, A first outer periphery having an internal space that opens at the end in the longitudinal direction and having a cross-sectional shape that is twice symmetrical in the longitudinal direction, The inner surface of the first outer periphery has a pair of first screw hole portions that extend in the longitudinal direction and are opposite in the width direction, In the longitudinal direction, the end face of the molded member body is oblique to the plane defined by the longitudinal direction and the width direction. The second outer periphery has a second internal space that opens at the end in a second longitudinal direction obtained by rotating the longitudinal direction by 180° around an axis perpendicular to the end face of the molded member body, The inner surface of the second outer periphery has a pair of second screw hole portions that extend in the second longitudinal direction and face each other in the width direction, The cross-sectional shape of the second outer periphery perpendicular to the second longitudinal direction is the same as the cross-sectional shape of the first outer periphery. The end face of the end member in the second longitudinal direction is oblique to the plane defined by the second longitudinal direction and the width direction, and the end face of the end member abuts against the end face of the molded member body, thereby joining the end member to the molded member body. A molded product characterized by the following features.

8. A screw that is passed through the inside of the second screw hole and screwed into the first screw hole. The molded article according to claim 7, characterized by comprising the above.

9. An outer periphery having an internal space that opens at the ends in the longitudinal direction and having a cross-sectional shape that is twice symmetrical in the longitudinal direction, On the inner surface of the outer periphery, a pair of screw holes are formed that extend in the longitudinal direction and face each other in the width direction, A molded member characterized by comprising the following features.

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