JP5681617B2 - Manufacturing method of fiber reinforced resin member with nut - Google Patents

Description

The present invention includes a cylindrical portion in which an internal thread is formed and an annular flange portion extending radially outward from the cylindrical portion, and a plurality of through holes arranged in the circumferential direction are formed in the flange portion. The present invention relates to a method for manufacturing a fiber reinforced resin member with a nut in which a nut is embedded in a fiber reinforced resin member .

  A metal insert having a female thread is fixed to the wall of an automobile cabin formed of FRP, and the lower end of the metal pillar is fastened to the insert with a bolt to integrally couple the cabin and the pillar. Is known from Patent Document 1 below.

  Also, an insert having an outer peripheral wall, a rib, and a fastening portion is arranged inside a frame configured to have a closed cross section with FRP, and the fastening member is fastened to the fastening portion of the insert with a bolt so that the frame and the fastening member are integrated. What is coupled is known from US Pat.

JP 2004-34977 A JP 2009-255799 A

  By the way, what was described in the said patent document 1 is considered that the insertion body is fixed to the wall part of a cabin by adhesion | attachment, and it is difficult to manage adhesive strength so that an adhesion part may not peel off. There is.

  Further, the one described in Patent Document 2 has a problem that the manufacturing process becomes complicated because it is necessary to bond an insert to the inside in the process of forming a frame made of FRP.

  Therefore, it is conceivable to embed the nut inside the fiber reinforced resin member and integrate both, but when the nut slips against the fiber reinforced resin member due to the torque when screwing the bolt into the nut. There is a possibility that sufficient fastening force cannot be obtained.

  The present invention has been made in view of the above circumstances, and an object thereof is to firmly fix a nut embedded in a fiber-reinforced resin member.

In order to achieve the above object, according to the first aspect of the present invention, the apparatus includes a cylindrical portion in which an internal thread is formed, and an annular flange portion extending radially outward from the cylindrical portion, A manufacturing method of a fiber reinforced resin member with a nut in which a nut having a plurality of through holes arranged in a circumferential direction in a flange portion is embedded in a fiber reinforced resin member, wherein the first dry A step of arranging a sheet, a step of fixing a base end side of the cylindrical portion through an opening formed in the first dry sheet in the cavity of the fixed mold , and fitting on an outer peripheral surface of the flange portion A step of laminating a second dry sheet having an opening that can be joined to the first dry sheet, and a third dry sheet having an opening that can be fitted to the outer peripheral surface on the distal end side of the cylindrical portion. Laminating to, A step of closing the cavity by coupling a movable die in serial fixed, said resin is injected into the cavity first dry sheet, impregnated into the second dry sheet and the third dry sheet, and the resin A step of intruding into the through-hole of the flange portion; and a step of opening the movable mold after the resin is cured and taking out the fiber-reinforced resin member in which the nut is embedded. A method for manufacturing a reinforced resin member is proposed.

According to the invention described in claim 2, in addition to the structure of claim 1, a support hole in which a base end side of the cylindrical portion can be fitted is formed in the bottom of the fixed mold, and the support hole A pin is erected, and the first dry sheet is disposed in the cavity of the fixed mold, and then the base end side of the cylindrical portion is passed through the opening of the first dry sheet to form the support hole. And the nut is fixed in the cavity of the fixed mold by fitting the female screw of the cylindrical portion to the pin. Is proposed.

  In addition, the 1st, 2nd cylindrical part 11b, 11c of embodiment respond | corresponds to the cylindrical part of this invention, and the epoxy resin 16 of embodiment respond | corresponds to resin of this invention.

According to the configuration of claim 1, the nut embedded in the fiber reinforced resin member includes a cylindrical portion in which an internal thread is formed, and an annular flange portion extending radially outward from the cylindrical portion, A plurality of through holes arranged in the circumferential direction are formed in the flange, so that when the torque is applied to the nut, the resin shear stress that enters the through hole counteracts the torque, thereby reinforcing the fiber. The slip of the nut with respect to the resin member can be reliably prevented.

Further, a second dry sheet having an opening that can be fitted to the outer peripheral surface of the flange portion by fixing the proximal end side of the cylindrical portion through the opening formed in the first dry sheet in the fixed mold cavity. Since the third dry sheet having an opening that can be fitted to the outer peripheral surface on the distal end side of the cylindrical portion is laminated on the second dry sheet, the second dry sheet is positioned by positioning the nut with respect to the fixed mold. Not only can the dry sheet and the third dry sheet be laminated easily and with high accuracy, but also the flange portion is sandwiched between the first and third dry sheets, so that the resistance against the twisting of the nut is effectively achieved. Can be increased.

According to the second aspect of the present invention, since the female screw of the nut is closed with the pin when the resin is injected , the resin does not adhere to the female screw.

The perspective view of a nut. (First embodiment) Sectional drawing of the fiber reinforced resin board | plate material which embed | buried the nut. (First embodiment) Explanatory drawing of the manufacturing process of the fiber reinforced resin board material which embed | buried the nut. (First embodiment) Explanatory drawing of the manufacturing process of the fiber reinforced resin board material which embed | buried the nut. (First embodiment) The figure which shows the state which fastened the vehicle-mounted components with the volt | bolt to the nut. (First embodiment) The perspective view of a nut. (Second Embodiment)

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a metal nut 11 embedded in a fiber reinforced resin member includes first and second cylindrical portions 11 b and 11 c each having an internal thread 11 a formed on an inner peripheral surface, and first, An annular flange portion 11d that protrudes radially outward from between the second cylindrical portions 11b and 11c is provided, and six circular through holes 11e are formed in the flange portion 11d at intervals of 60 °. The

  As shown in FIG. 2, the fiber reinforced resin member 12 in which the nut 11 is embedded is obtained by laminating three dry sheets 13, 14, 15 in which carbon fibers are woven into a plain weave, and a reinforcing material inside the epoxy resin 16. As buried. The dry sheets 13, 14, 15 are composed of a central second dry sheet 14 and first and third dry sheets 13, 15 laminated on both sides thereof. The central first dry sheet 14 has a large diameter. An opening 14a is formed, and small diameter openings 13a and 15a are formed in the first and third dry sheets 13 and 15 on both sides thereof.

  The opening 13 a of the first dry sheet 13 is fitted to the outer periphery of the first cylindrical portion 11 b on the proximal end side of the nut 11, and the opening 14 a of the second dry sheet 14 is fitted to the outer periphery of the flange portion 11 d of the nut 11. The opening 15 a of the third dry sheet 15 is fitted to the outer periphery of the second cylindrical portion 11 c on the tip end side of the nut 11. The epoxy resin 16 impregnates the carbon cloth of the first to third dry sheets 13, 14, 15 and covers the surface, and penetrates into the through holes 11 e... Of the flange portion 11 d. At this time, the tip of the second cylindrical portion 11 c is covered with the epoxy resin 16.

  Next, the process of manufacturing the fiber reinforced resin member 12 with the nut 11 having the above-described configuration will be described.

  First, as shown in FIG. 3, a mold 17 for molding the fiber reinforced resin member 12 includes a fixed mold 18 and a movable mold 19, and the first cylindrical portion 11 b of the nut 11 is fitted to the bottom of the fixed mold 18. A support hole 18a having a possible circular cross section is formed, and a pin 18b is erected at the center of the support hole 18a. After the first dry sheet 13 cut into a predetermined shape is disposed at the bottom of the fixed mold 18, the first cylindrical portion 11 b of the nut 11 is passed through the opening 13 a of the first dry sheet 13 to support the support hole 18 a of the fixed mold 18. The nut 11 is fixed in the cavity 20 of the mold 17 by fitting the female screw 11a of the nut 11 to the pin 18b of the fixed mold 18.

  Subsequently, as shown in FIG. 4, the second dry sheet 14 cut into a predetermined shape so as to fit the opening 14 a is laminated on the outer periphery of the flange portion 11 d of the nut 11, and the second cylindrical portion of the nut 11 is further laminated. After laminating the third dry sheet 15 cut into a predetermined shape so that the opening 15 a is fitted to the outer periphery of 11 c, the movable die 19 is coupled to the fixed die 18. At this time, the nut 11 has the first cylindrical portion 11b fitted into the support hole 18a of the fixed mold 18 and fixed inside the mold 17. Therefore, the second dry sheet 14 and the second dry sheet 14 are fixed inside the fixed mold 18. The operation of laminating the three dry sheets 15 can be performed easily and with high accuracy.

  Subsequently, by injecting the epoxy resin 16 into the cavity 20 of the mold 17, the epoxy resin 16 is impregnated in the first to third dry sheets 13 to 15, and the through holes 11 e of the flange portion 11 d of the nut 11. Intrude into. After the epoxy resin 16 is cured, the movable mold 19 is opened, and the fiber reinforced resin member 12 with the nut 11 is taken out from the mold 17. When the epoxy resin 16 is injected, the internal thread 11a of the nut 11 is closed by the pin 18b, so that the epoxy resin 16 does not adhere to the internal thread 11a.

  In order to fix the vehicle-mounted component 21 to the fiber reinforced resin member 12 thus completed, a bolt 22 penetrating the vehicle-mounted component 21 may be screwed into the female screw 11a of the nut 11 as shown in FIG. Since the vehicle-mounted component 21 is fastened in contact with the end surface of the first cylindrical portion 11 b of the nut 11, high coupling strength can be obtained. Moreover, since the 2nd cylindrical part 11c of the nut 11 is not directly exposed to the upper surface of the fiber reinforced resin member 12, the appearance of the fiber reinforced resin member 12 can be improved.

  When the bolt 22 is screwed into the nut 11, the nut 11 tries to rotate relative to the fiber reinforced resin plate 11 with the fastening torque of the bolt 22, but the flange portion 11 d of the nut 11 contacts the epoxy resin 16 with a large surface area. Therefore, not only the flange portion 11d is firmly integrated with the epoxy resin 16 that functions as an adhesive at the time of curing, but also the shear stress of the epoxy resin 16 inserted into the through-holes 11e of the flange portion 11d becomes the torque. By opposing, the slip of the nut 11 with respect to the fiber reinforced resin member 12 can be reliably prevented.

  Moreover, since the through holes 11e are of the same shape and are arranged at equal intervals in the circumferential direction of the flange portion 11d, the shear stress that opposes the fastening torque of the bolt 22 is uniformly exhibited in each circumferential portion of the flange portion 11d. Thus, not only can the slip of the nut 11 be more reliably prevented, but also the magnitude of the fastening torque that the nut 11 can withstand can be easily set only by changing the diameter and number of the through holes 11e.

  Further, the nut 11 embedded in the fiber reinforced resin member 12 is sandwiched between the first and third dry sheets 13 and 15 on both sides of the flange portion 11d. Can be enhanced.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, frictional force increasing means 11f made of concentric concave and convex portions are formed on both surfaces of the flange portion 11d of the nut 11. By this frictional force increasing means 11 f..., The contact area between the flange portion 11 d of the nut 11 and the epoxy resin 16 of the fiber reinforced resin member 12 is increased and the two are firmly coupled. It is possible to prevent the rotation more reliably.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the fiber reinforced resin member 12 is not necessarily made of CFRP (carbon fiber reinforced plastic), but may be made of FRP (fiber reinforced plastic).

  The fiber reinforced resin member 12 is not limited to the cabin of an automobile.

11 Nut 11a Female thread 11b First cylindrical part (cylindrical part)
11c 2nd cylindrical part (cylindrical part)
11d Flange portion 11e Through hole 12 Fiber reinforced resin member 13 First dry sheet 13a Opening 14 Second dry sheet 14a Opening 15 Third dry sheet 15a Opening 16 Epoxy resin (resin)
18 Fixed mold 18a Support hole
18b pin 19 movable type 20 cavity

Claims (2)

A cylindrical portion (11b, 11c) in which an internal thread (11a) is formed; and an annular flange portion (11d) extending radially outward from the cylindrical portion (11b, 11c), the flange portion (11d) ) In which a nut (11) in which a plurality of through-holes (11e) arranged in the circumferential direction is formed is embedded in the fiber-reinforced resin member (12), and a method for producing a fiber-reinforced resin member with a nut,
Placing the first dry sheet (13) in the cavity (20) of the stationary mold (18);
The step of fixing the base end side of the fixed mold (18) the cavity (20) wherein the cylindrical portion extends through the opening (13a) formed in a first dry sheet (13) in the (11b, 11c) When,
Laminating a second dry sheet (14) having an opening (14a) that can be fitted to the outer peripheral surface of the flange portion (11d) on the first dry sheet (13);
Laminating a third dry sheet (15) having an opening (15a) that can be fitted to the outer peripheral surface on the distal end side of the cylindrical portion (11b, 11c) on the second dry sheet (14);
Coupling a movable mold (19) to the stationary mold (18) to close the cavity (20);
Resin (16) is injected into the cavity (20) to impregnate the first dry sheet (13), the second dry sheet (14), and the third dry sheet (15), and the resin (16) Intruding into the through hole (11e) of the flange portion (11d) ,
Opening the movable mold (19) after curing the resin (16) and taking out the fiber reinforced resin member (12) in which the nut (11) is embedded;
The manufacturing method of the fiber reinforced resin member with a nut characterized by including these. A support hole (18a) into which the base end side of the cylindrical portion (11b, 11c) can be fitted is formed at the bottom of the fixed mold (18), and a pin (18b) is raised in the support hole (18a). Established,
After disposing the first dry sheet (13) in the cavity (20) of the fixed mold (18), the base end side of the cylindrical portion (11b, 11c) is placed on the first dry sheet (13). By fitting the female screw (11a) of the cylindrical part (11b, 11c) to the pin (18b) while passing through the opening (13a) and fitting into the support hole (18a), The method for producing a fiber-reinforced resin member with a nut according to claim 1, wherein the nut (11) is fixed in the cavity (20) of the fixed mold (18).

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