JP2020015201A - Method for manufacturing resin molded article - Google Patents

Abstract

To provide a method of manufacturing a resin molded article capable of embedding a fastening member at a predetermined position of the resin molded article.SOLUTION: The method includes: a step of preparing a molding die 20 composed of an upper mold 21 in which an engagement hole 26 is formed at a place where an insert nut 15 is embedded and a lower die 22; a step of engaging a fixing plug 27 with the engagement hole 26 of the upper mold 21 to attach the insert nut 15 to the fixing plug 27; a step of molding a resin inside a cavity 25 formed by bringing the upper mold 21 and the lower mold 22 closer to each other; a step of removing a resin molded article from the molding die with the insert nut 15 attached thereto from the molding die 20; and a step of separating the fixing plug 27 from the resin molded article.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a resin molded product, and more particularly, to a method for manufacturing a resin molded product in which a resin molded product is molded using a molding die.

  In recent years, a resin transfer molding (RTM) method or the like has been used as a method for producing a fiber-reinforced composite material part. In these methods, a laminate in which a plurality of reinforcing fiber sheets are laminated is set in a mold, and after clamping, the uncured resin is injected, and the laminate is impregnated and cured. According to this method, since a laminate made of a dry base material not impregnated with a resin is shaped, it is possible to manufacture a molded article having a relatively complicated shape.

  In some cases, PCM (Prepreg Compression Molding) is employed as a method of manufacturing a fiber-reinforced composite material part. In this method, a prepreg in which a resin is impregnated into a reinforcing fiber sheet is placed in a cavity of a molding die, and high temperature and high pressure are applied to the reinforcing fiber sheet of the prepreg to produce a fiber reinforced composite material part.

  However, the reinforced fiber sheet before impregnating with the resin is poor in handleability, for example, the reinforced fiber sheet laminated during transportation becomes different. For this reason, there is a case where a preliminary shaping step is usually set before the main shaping in which the resin is impregnated (Patent Document 1).

  In the preliminary shaping step, one reinforcing fiber sheet is set in a mold for preliminary shaping, a powdery fixing material is sprayed on the surface of the reinforcing fiber sheet, and the next reinforcing fiber sheet is laminated thereon. These steps are sequentially repeated to form a reinforced fiber sheet laminate, and thereafter, mold clamping is performed by a pre-shaping mold. Thereby, the reinforcing fiber sheets are fixed to each other, and a preform preformed into a shape suitable for the subsequent main shaping is formed. In the main shaping step, the preform body is set in a metal mold for the main shaping, thereby facilitating the positioning and preventing a displacement during the main shaping.

  Also, a manufacturing method of embedding an insert nut in a resin molded product when performing injection molding has been developed (Patent Document 2). Here, the insert nut is attracted to the inner wall of the mold using magnetic force, and in this state, the resin molded body is injection-molded together with the insert nut. By doing so, a resin molded body in which the insert nut is embedded can be molded.

JP 2008-179130 A JP-A-6-63987

  However, in the resin molding method described in Patent Literature 2, even if the insert nut is adhered to the mold by magnetic force, the insert nut is displaced from a predetermined position if the internal pressure of the mold during resin molding increases. was there.

  Even if the insert nut is brought into close contact with the inner wall of the mold by magnetic force, the resin may enter between the insert nut and the inner wall of the mold during molding, and the resin may enter the hole of the insert nut. there were.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for manufacturing a resin molded product in which a fastening member can be embedded at a predetermined position of the resin molded product.

  The present invention relates to a method for manufacturing a resin molded product in which a resin molded product in which a fastening member is embedded is provided, wherein a first mold having an engaging portion formed in a location where the fastening member is embedded is provided. Preparing a molding die comprising: a die; attaching the fastening member to the engaging portion of the first die via a fixing plug; and forming the first die and the second die. A step of molding a resin inside a cavity formed by bringing the mold close to the mold, a step of taking out the resin molded article with the fixing plug attached thereto from the molding die, and a step of removing the resin molded article from the resin molded article. Removing the fixing plug.

  In the method for manufacturing a resin molded product according to the present invention, the fastening member is an insert nut, and the insert nut is fixed to the fixing plug by a screwing structure.

  In the method for manufacturing a resin molded product of the present invention, the engagement portion is an engagement hole formed in the first mold, and the fixing plug is inserted into the engagement hole. It is characterized by being fixed to the first mold.

  In the method for manufacturing a resin molded product according to the present invention, an O-ring is provided between the fixing plug and the engagement hole.

  In the method for manufacturing a resin molded product of the present invention, a concave portion may be formed by depressing an outer peripheral surface of the fixed plug all around, and the O-ring may be engaged with the concave portion of the fixed plug. It is characterized by.

  In the method for manufacturing a resin molded product of the present invention, a flange portion is formed at an end of the fixed plug, and in the molding step, the flange portion of the fixed plug is brought into contact with an inner surface of the first mold. It is characterized by contact.

  Further, in the method for producing a resin molded product according to the present invention, the resin molded product is a fiber-reinforced composite material part.

  In the method of manufacturing a resin molded product according to the present invention, a magnet is provided near the fixing plug.

  The present invention relates to a method for manufacturing a resin molded product in which a resin molded product in which a fastening member is embedded is provided, wherein a first mold having an engaging portion formed in a location where the fastening member is embedded is provided. Preparing a molding die comprising: a die; attaching the fastening member to the engaging portion of the first die via a fixing plug; and forming the first die and the second die. A step of molding a resin inside a cavity formed by bringing the mold close to the mold, a step of taking out the resin molded article with the fixing plug attached thereto from the molding die, and a step of removing the resin molded article from the resin molded article. Removing the fixing plug. Therefore, in the method for producing a resin molded product of the present invention, the position of the fastening member inside the cavity is determined by the fixing plug, and further, in the releasing step, the fixing plug is taken out of the molding die together with the fastening member. The fastening member can be stably embedded in the molded product.

  In the method for manufacturing a resin molded product according to the present invention, the fastening member is an insert nut, and the insert nut is fixed to the fixing plug by a screwing structure. Therefore, in the method for manufacturing a resin molded product of the present invention, the insert nut can be stably embedded in the resin molded product.

  In the method for manufacturing a resin molded product of the present invention, the engagement portion is an engagement hole formed in the first mold, and the fixing plug is inserted into the engagement hole. It is characterized by being fixed to the first mold. Therefore, according to the method for manufacturing a resin molded product of the present invention, the position of the fastening member in the resin molded product can be accurately defined with a simple configuration in which the fixing plug is inserted into the insertion hole.

  In the method for manufacturing a resin molded product according to the present invention, an O-ring is provided between the fixing plug and the engagement hole. Therefore, according to the method of manufacturing a resin molded product of the present invention, by disposing the O-ring between the fixing plug and the engaging hole, the fixing plug is disposed in the engaging hole of the first mold. Can be. In the detaching step, the fixing plug can be easily detached from the engagement hole.

  In the method for manufacturing a resin molded product of the present invention, a concave portion may be formed by depressing an outer peripheral surface of the fixed plug all around, and the O-ring may be engaged with the concave portion of the fixed plug. It is characterized by. Therefore, according to the method for manufacturing a resin molded product of the present invention, the engagement between the fixed plug and the O-ring can be enhanced by engaging the O-ring with the concave portion of the fixed plug. Therefore, in the molding step, the fixing plug is firmly engaged with the engaging portion of the first mold by the O-ring, so that careless movement and detachment of the fixing plug can be prevented. Further, the O-ring together with the fixing plug can be easily taken out of the molding die in the detaching step.

  In the method for manufacturing a resin molded product of the present invention, a flange portion is formed at an end of the fixed plug, and in the molding step, the flange portion of the fixed plug is brought into contact with an inner surface of the first mold. It is characterized by contact. Therefore, according to the method for manufacturing a resin molded product of the present invention, by causing the flange portion of the fixed plug to abut against the inner surface of the first mold, it is possible to prevent the resin from entering between the fixed plug and the engaging portion. Can be prevented.

  Further, in the method for producing a resin molded product according to the present invention, the resin molded product is a fiber-reinforced composite material part. Therefore, according to the method of manufacturing a resin molded product of the present invention, the fiber of the fiber-reinforced composite material component is prevented from entering between the engaging portion and the fixing plug, and the resin is inserted into the gap between the fixing plug and the engaging portion. Can be prevented from entering.

  In the method of manufacturing a resin molded product according to the present invention, a magnet is provided near the fixing plug. Therefore, according to the method for manufacturing a resin molded product of the present invention, the fixing plug can be temporarily fixed to the first mold by the magnetic force of the magnet.

It is a figure which shows the resin molded article manufactured by the manufacturing method of the resin molded article of this invention, (A) is a perspective view which shows a resin molded article, (B) is a cut surface line AA of (A). FIG. 2C is a cross-sectional view of FIG. It is a perspective view which shows the molding die used for the manufacturing method of the resin molded article of this invention. It is a perspective view showing the upper metallic mold used for the manufacturing method of the resin molding of the present invention. (A) is a perspective view showing an engagement jig and an insert nut used in the method of manufacturing a resin molded product of the present invention, and (B) is a perspective view showing an insert nut. It is a perspective view showing the state where the engaging jig and insert nut used for the manufacturing method of the resin molding of the present invention were combined. It is a figure which shows the manufacturing method of the resin molded product of this invention, (A) is sectional drawing which shows a shaping | molding die, (B) is an enlarged sectional view which expands and shows the principal part of (A). It is a figure which shows the manufacturing method of the resin molded product of this invention, (A) is sectional drawing which shows a shaping | molding die, (B) is an enlarged sectional view which expands and shows the principal part of (A). It is a figure which shows the manufacturing method of the resin molded product of this invention, (A) is sectional drawing which shows a shaping | molding die, (B) is an enlarged sectional view which expands and shows the principal part of (A). It is a figure which shows the manufacturing method of the resin molded product of this invention, (A) is sectional drawing which shows a shaping | molding die, (B) is an enlarged sectional view which expands and shows the principal part of (A). It is a figure which shows the manufacturing method of the resin molded product of this invention, (A) shows the taken-out resin molded product, (B) is an expanded sectional view which expands and shows the important point of (A). It is a figure which shows the manufacturing method of the resin molded product of this invention, Comprising: (A) and (B) are the expanded sectional views which expand and show an important point.

  Hereinafter, a method for manufacturing a resin molded product according to the present embodiment will be described with reference to the drawings. In the following description, the same members are denoted by the same reference numerals in principle, and the repeated description will be omitted.

  With reference to FIG. 1, a fiber-reinforced composite part 10 which is a resin molded product manufactured by the manufacturing method according to the present embodiment will be described. FIG. 1A is a perspective view of the fiber reinforced composite material component 10 as viewed from above, and FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A. (C) is an enlarged perspective view showing the mounting portion 16.

  Referring to FIG. 1A, the fiber-reinforced composite material component 10 is, for example, CFRP (Carbon Fiber Reinforced Plastics). The fiber-reinforced composite part 10 has a substantially tray shape as an example. Specifically, the fiber-reinforced composite material component 10 includes a substantially square bottom surface portion 13 as viewed from above, and a frame-shaped side surface portion 14 erected upward from the periphery of the bottom portion 13. Have. Here, in this embodiment, it is also possible to manufacture a resin molded body that does not contain fibers.

  Referring to FIG. 1 (B), a fiber-reinforced composite material component 10 includes a reinforcing fiber sheet 11 and a resin 12 impregnated into the reinforcing fiber sheet 11 and cured.

  As the reinforcing fibers constituting the reinforcing fiber sheet 11, for example, carbon fibers, glass fibers, aramid fibers and the like can be used. As a form of the reinforcing fiber sheet 11, a fabric material such as a woven fabric or a knitted fabric, or a UD material (unidirectional material) can be adopted. The reinforcing fiber sheet 11 is configured as a laminate in which a plurality of sheet-like reinforcing fibers are laminated.

  As the resin 12, a thermosetting resin such as an epoxy resin or a thermoplastic resin such as polyamide (PA) or polypropylene (PP) can be adopted. The resin 12 is cured in a state of being impregnated in the reinforcing fiber sheet 11, that is, in a state of entering the reinforcing fiber sheet 11.

  Referring to FIG. 1 (C), mounting portion 16 is formed by partially raising the above-described bottom portion 13 partially upward. The mounting portion 16 protrudes upward in a substantially cylindrical shape. The attachment portion 16 is made of a composite material of the resin 12 and the reinforced fiber sheet 11, like the other portions of the fiber reinforced composite material component 10. The upper surface of the mounting portion 16 is substantially flat.

  An insert nut 15 is embedded on the upper surface of the mounting portion 16 as a fastening member. The insert nut 15 is a member for fastening the fiber-reinforced composite material component 10 to another member, and has a thread groove formed therein. The upper surface of the insert nut 15 is arranged on the same plane as the upper surface of the mounting portion 16.

  As described later, according to the method for manufacturing a resin molded product according to the present embodiment, since the resin component is prevented from flowing into the internal space of the insert nut 15, the screw hole of the insert nut 15 is Can be prevented from being accidentally buried.

  FIG. 2 is a perspective view of a molding die 20 used in the method of manufacturing the fiber reinforced composite material component 10 as viewed from above. Here, the upper mold 21 and the lower mold 22 are shown separated vertically.

  The molding die 20 is a resin molding die, and has an upper die 21 (first die) and a lower die 22 (second die). In the molding step, when the upper mold 21 descends and approaches the lower mold 22, a cavity 25 (FIG. 8A) is formed as a gap between the upper mold 21 and the lower mold 22. You. Further, by raising the upper mold 21 and separating it from the lower mold 22, the fiber-reinforced composite material component 10, which is a resin molded product, can be taken out of the molding mold 20. Further, an engagement hole 26 is formed in the upper mold 21. The engagement hole 26 is an engagement portion for engaging a jig for fixing the insert nut 15 described above.

  FIG. 3 shows the upper mold 21 described above. FIG. 3 is a perspective view of the upper mold 21 as viewed from below. Referring to this figure, an engagement hole 26 is formed in upper mold 21. The engagement hole 26 is a through hole that passes through the upper mold 21 in the thickness direction.

  With reference to FIG. 4, the configuration and the like of the engagement jig 30 that engages the mounting portion 16 in the molding process will be described. FIG. 4A is a perspective view of the engagement jig 30 and the insert nut 15 as viewed from below, and FIG. 4B is a perspective view of the insert nut 15 as viewed from above.

  Referring to FIG. 4A, the engagement jig 30 has a fixing plug 27, an O-ring 28, and a fixing bolt 37.

  The fixing plug 27 is a jig inserted into the inner end of the engagement hole 26 described above, and includes a tubular portion 33 and a flange portion 34. As the material of the fixing plug 27, metal, silicon, resin, wood, or the like molded into a predetermined shape can be adopted. The concave part 29 is formed by depressing the middle part in the vertical direction of the cylindrical part 33 inward. The concave portion 29 is formed along the periphery of the cylindrical portion 33 in a band shape and over the entire circumference. The flange portion 34 is a portion that extends from the lower end of the tubular portion 33 toward the outside in the radial direction. The lower surface and the upper surface of the flange portion 34 are formed flat. The flange portion 34 is a portion that comes into surface contact with the periphery of the engagement hole 26 of the upper mold 21 described above. Further, a hole 38 penetrating the fixing plug 27 along the central axis is formed. The hole 38 is formed in a size that allows the fixing bolt 37 to be inserted.

  The O-ring 28 is made of an elastic body such as rubber formed in a ring shape, and is fitted into the concave portion 29 of the fixing plug 27. The O-ring 28 is a member for engaging the engaging jig 30 with the engaging hole 26 of the upper mold 21 described above.

  The fixing bolt 37 includes a shaft portion 32 and a head portion 31 and is formed of a steel material formed into a predetermined shape. A thread is formed in the shaft portion 32. Although not shown here, a hole that can be fitted with a tool such as a hexagon wrench is formed on the upper surface of the head 31.

  The insert nut 15 is made of steel, plastic, or the like molded into a predetermined shape, and has a cylindrical portion 35 and a flange portion 36. The cylindrical portion 35 is formed in a substantially cylindrical shape. The flange portion 36 is formed by expanding the upper end portion of the cylindrical portion 35 outward in the radial direction. The upper surface of the flange portion 36 is a flat surface. During molding, the upper surface of the flange 36 of the insert nut 15 is in close contact with the lower surface of the flange 34 of the fixed plug 27.

  Referring to FIG. 4B, a hole 39 is formed in insert nut 15. On the inner surface of the hole 39, a screw groove which can be screwed with the screw thread formed on the fixing bolt 37 is formed. Here, the hole 39 is a bottomed hole, but the hole 39 may be a bottomless hole penetrating the insert nut 15.

  FIG. 5 is a perspective view showing a state in which the insert nut 15 is incorporated in the engagement jig 30. Here, a thread formed on the fixing bolt 37 is screwed into a thread groove formed inside the insert nut 15. By doing so, the lower surface of the flange portion 34 of the fixed plug 27 and the upper surface of the flange portion 36 of the insert nut 15 can be brought into close contact. Accordingly, it is possible to prevent the resin from entering between the flange portion 36 and the flange portion 34 and from entering the inside of the insert nut 15 in the resin molding step described later.

  Next, a method for manufacturing the fiber-reinforced composite material component 10 shown in FIG. 1 will be described with reference to FIGS.

  With reference to FIG. 6, the cross section of the molding die 20 used in the method of manufacturing the fiber reinforced composite component 10 will be described. FIG. 6A is a cross section of the molding die 20 taken along the line BB of FIG. 2, and FIG. 6B is an enlarged view of a portion surrounded by a dotted line circle in FIG. It is an expanded sectional view shown.

  Referring to FIG. 6A, first, a molding die 20 including an upper die 21 and a lower die 22 is prepared. A convex portion 23 is formed at a lower portion of the lower mold 22, and a concave portion 24 is formed at an upper portion of the lower mold 22. An engagement hole 26 that penetrates the upper mold 21 in the up-down direction is formed, and the lower end of the engagement hole 26 is enlarged to form a mounting portion forming portion 40.

  By lowering the upper mold 21 and inserting the convex portion 23 of the upper mold 21 into the concave portion 24 of the lower mold 22, a cavity 25 described later is formed between the convex portion 23 and the concave portion 24. I do.

  Referring to FIG. 6 (B), mounting portion forming portion 40 is a portion for forming mounting portion 16 shown in FIG. 1 (C). The mounting portion forming portion 40 has a tapered shape whose width gradually increases downward. Further, a flat flange receiving portion 41 is formed at the upper end of the mounting portion forming portion 40. The size of the flange receiving portion 41 is equivalent to the size of the flange portion 34 of the fixed plug 27 shown in FIG. By doing so, as described later, the upper surface of the flange portion 34 of the fixed plug 27 is brought into contact with the upper surface of the flange receiving portion 41, and it is possible to prevent fibers and resin from entering the gap between the two in the molding process. Can be prevented.

  Next, referring to FIG. 7, an engagement jig 30 to which the insert nut 15 is attached is fitted into the molding die 20. FIG. 7A is a cross-sectional view showing this step, and FIG. 7B is an enlarged cross-sectional view showing a portion surrounded by a dotted line in FIG. 7A.

  Referring to FIG. 7 (A), when the upper mold 21 and the lower mold 22 of the molding die 20 are separated from each other, the engaging jig is engaged with the mounting portion forming portion 40 of the molding die 20. 30 is fitted.

  Referring to FIG. 7 (B), when fitting engagement jig 30 into attachment portion forming portion 40 of upper mold 21, fixing plug 27 of engagement jig 30 is inserted into engagement hole 26. . As described above, the fixed plug 27 is provided with the O-ring 28 made of rubber formed in an annular shape. Therefore, when the fixing plug 27 is inserted into the engaging hole 26 from below, the inner wall of the engaging hole 26 and the outer wall of the cylindrical portion 33 of the fixing plug 27 come into contact via the O-ring 28 deformed by the compressive force. I have. Therefore, the fixed plug 27 comes into close contact with the inner wall of the engagement hole 26 due to the large frictional force of the O-ring 28. Therefore, when the engagement jig 30 is inserted into the engagement hole 26, the engagement jig 30 does not separate from the engagement hole 26 by the action of gravity.

  The upper surface of the flange portion 34 of the fixed plug 27 is in close contact with the lower surface of the flange receiving portion 41 of the upper mold 21. By doing so, in the resin molding process, it is possible to prevent the resin from entering between the flange receiving portion 41 and the flange portion 34, and prevent the resin from entering the inside of the cylindrical portion 35. .

  By arranging the engagement jig 30 as described above, the insert nut 15 is arranged on the mounting portion forming portion 40.

  Next, referring to FIG. 8, the reinforcing fiber sheet 11 is arranged in the molding die 20. FIG. 8A is a cross-sectional view showing this step, and FIG. 8B is an enlarged cross-sectional view showing a portion surrounded by a dotted line in FIG. 8A.

  8 (A) and 8 (B), the reinforcing fiber sheet 11 is arranged on the upper surface of the concave portion 24 of the lower mold 22, and the upper mold 21 is lowered, so that the inside of the cavity 25 is reduced. The reinforcing fiber sheet 11. Here, the reinforcing fiber sheet 11 may be prepared in a prepreg state in which the resin 12 is impregnated.

  Referring to FIG. 8 (B), reinforcing fiber sheet 11 is also arranged at mounting part forming part 40. This is to increase the strength of the mounting portion 16 (FIG. 1C) formed in the mounting portion forming portion 40. As described above, since the flange portion 36 of the insert nut 15 and the flange portion 34 of the fixing plug 27 are in close contact with each other, the fibers constituting the reinforcing fiber sheet 11 are located between the insert nut 15 and the fixing plug 27. You will not enter. Similarly, since the flange receiving portion 41 of the upper mold 21 and the flange portion 34 of the fixing plug 27 are in close contact with each other, the fibers constituting the reinforcing fiber sheet 11 are located between the flange receiving portion 41 and the flange portion 34. There is no approach.

  Referring to FIG. 9, resin formation is performed. FIG. 9A is a cross-sectional view showing this step, and FIG. 9B is an enlarged cross-sectional view showing a portion surrounded by a dotted line in FIG. 9A.

  Referring to FIGS. 9A and 9B, resin molding is performed in a state where upper mold 21 and lower mold 22 are heated. When the reinforcing fiber sheet 11 is a prepreg, the resin 12 impregnated in the reinforcing fiber sheet 11 is cured by heating and forming the reinforcing fiber sheet 11 with the upper mold 21 and the lower mold 22. On the other hand, only the reinforcing fiber sheet 11 may be built in the cavity 25, and then the resin 12 may be injected into the cavity 25.

  Referring to FIG. 9B, in this step, the flange portion 36 of the insert nut 15 and the flange portion 34 of the fixing plug 27 are in close contact with each other by the fastening force of the fixing bolt 37, so that the resin 12 It does not enter between the insert nut 15 and the fixing plug 27. Further, since the flange receiving portion 41 of the upper mold 21 and the flange portion 34 of the fixed plug 27 are in close contact with each other, the resin 12 does not enter between the flange receiving portion 41 and the flange portion 34. Here, the flange portion 34 of the fixed plug 27 is pressed against the flange receiving portion 41 of the upper mold 21 by the internal pressure at the time of molding.

  After this step is completed, the upper mold 21 is lifted to separate the upper mold 21 from the lower mold 22.

  FIG. 10A shows the fiber-reinforced composite material part 10 released from the molding die 20 shown in FIG. 9A. FIG. 10A is a cross-sectional view of the fiber-reinforced composite component 10. As shown in FIG. 10 (A), the mounting portion 16 is formed on the upper surface of the bottom portion 13 by releasing the fiber-reinforced composite material component 10 from the molding die 20 in the above-described process.

  FIG. 10B is a cross-sectional view showing the vicinity of the mounting portion 16. Referring to this figure, insert nut 15 is embedded in mounting portion 16. Further, since the fixing bolt 37 is screwed into the insert nut 15, when the fiber reinforced composite material component 10 is released from the molding die 20, the engaging jig 30 is molded together with the fiber reinforced composite material component 10. It comes off the mold 20. In this state, the fixing bolt 37 is detached from the insert nut 15 by rotating the fixing bolt 37 using a tool.

  Since the fixing plug 27 is taken out of the molding die 20 together with the fiber-reinforced composite material component 10, there is no need to remove the fixing plug 27 from the molding die 20 separately from the fiber-reinforced composite material component 10. Therefore, the use of the fixing plug 27 suppresses the complexity of the release process.

  Further, as shown in FIG. 4B, the O-ring 28 is attached to the concave portion 29 of the fixed plug 27. Therefore, the O-ring 28 can be taken out together with the fiber-reinforced composite material component 10, and the O-ring 28 does not remain in the molding die 20. For this reason, there is no need to remove the O-ring 28 from the molding die 20 separately from the fiber-reinforced composite material part 10. Thus, the use of the O-ring 28 prevents the release process from becoming complicated.

  FIG. 11A is a cross-sectional view of the vicinity of the mounting portion 16 after the fixing bolt 37 is detached. Referring to this figure, fixing plug 27 is placed on the upper surface of mounting portion 16.

  FIG. 11B is a cross-sectional view after the fixing plug 27 is released. The insert nut 15 is embedded in the mounting portion 16. Further, the upper surface of the flange portion 36 of the insert nut 15 is arranged on the same plane as the upper surface of the mounting portion 16.

  Here, as described above, the above-described resin molding is performed while the upper surface of the flange portion 36 of the insert nut 15 is in close contact with the lower surface of the flange portion 34 of the fixed plug 27 shown in FIG. I have. Therefore, the resin 12 and the reinforcing fiber sheet 11 shown in FIG. 10B and the like do not enter the inside of the insert nut 15. Therefore, the inside of the insert nut 15 is in a normal state in which foreign matter is not mixed.

  After the above steps are completed, the fiber-reinforced composite component 10 is incorporated into a device as a part of a structure or a housing. For example, the fiber-reinforced composite material part 10 is a member constituting a bottom part of a large scale and a part of an automobile.

  As described above, the embodiments of the present invention have been described, but the present invention is not limited thereto, and can be changed without departing from the spirit of the present invention.

  Referring to FIG. 1 (C), in the above-described embodiment, insert nut 15 is employed as a fastening member embedded in fiber-reinforced composite material part 10, but an insert bolt may be employed as a fastening member. Further, as a member embedded in the fiber-reinforced composite material part 10, an insert plate having a screwing structure can be adopted.

  Referring to FIG. 4A, although fixing bolt 37 and fixing plug 27 are formed as separate members in engagement jig 30, fixing plug 27 and fixing bolt 37 are formed as an integral member. Can also. However, as described above, by using the fixing plug 27 and the fixing bolt 37 as separate components, the fixing bolt 37 corresponding to the insert nut 15 can be adopted, and the versatility of the engaging jig 30 is improved. be able to.

  Further, referring to FIG. 7B, in the above-described embodiment, the fixing plug 27 is temporarily fixed by the O-ring 28, but a magnet may be used instead of the O-ring 28. In this case, a magnet is arranged inside the engaging hole 26 above the fixing plug 27 made of a ferromagnetic material. By doing so, the magnetic force of the magnet draws the fixed plug 27, so that the fixed plug 27 can be engaged. After the molding is completed, the fixing plug 27 can be easily removed.

REFERENCE SIGNS LIST 10 fiber reinforced composite component 11 reinforced fiber sheet 12 resin 13 bottom part 14 side part 15 insert nut 16 mounting part 20 molding die 21 upper die 22 lower die 23 convex part 24 concave part 25 cavity 26 engaging hole 27 Fixing plug 28 O-ring 29 Concave portion 30 Engagement jig 31 Head 32 Shaft portion 33 Cylindrical portion 34 Flange portion 35 Cylindrical portion 36 Flange portion 37 Fixing bolt 38 Hole portion 39 Hole portion 40 Mounting portion forming portion 41 Flange receiver Department

Claims (8)

In a method for manufacturing a resin molded product in which a resin molded product in which a fastening member is buried is molded,
A step of preparing a molding die including a first die in which an engagement portion is formed at a location where the fastening member is embedded, and a second die;
Attaching the fastening member to the engagement portion of the first mold via a fixing plug;
Molding a resin inside a cavity formed by bringing the first mold and the second mold close to each other;
Removing the resin molded product with the fixing plug attached thereto from the molding die;
Removing the fixing plug from the resin molded product.   The method according to claim 1, wherein the fastening member is an insert nut, and the insert nut is fixed to the fixing plug by a screwing structure. The engagement portion is an engagement hole formed in the first mold,
The method for manufacturing a resin molded product according to claim 1, wherein the fixing plug is fixed to the first mold by being inserted into the engagement hole.   The method according to claim 3, wherein an O-ring is provided between the fixing plug and the engagement hole. Forming a concave portion by depressing the outer peripheral surface of the fixing plug all around,
The method for manufacturing a resin molded product according to claim 4, wherein the O-ring is engaged with the concave portion of the fixing plug. Forming a flange portion at the end of the fixed plug,
The method of manufacturing a resin molded product according to any one of claims 1 to 5, wherein in the molding step, the flange portion of the fixed plug is brought into contact with an inner surface of the first mold. .   The method for manufacturing a resin molded product according to claim 1, wherein the resin molded product is a fiber-reinforced composite material part. The method for manufacturing a resin molded product according to claim 1, wherein a magnet is provided near the fixing plug.

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