JP6396513B2 - Resin reinforced metal parts - Google Patents

Description

  The present invention relates to a resin-reinforced metal part in which a CFRP reinforcing material is bonded to the surface of a metal part with a thermosetting adhesive.

When moisture adheres to a contact portion of different metals having different ionization tendencies, electrochemical corrosion occurs at the contact portion. In addition, even in a contact portion between a metal and CFRP (carbon fiber reinforced resin), if water adheres between the carbon fiber exposed from the end of the CFRP and the metal, electrochemical corrosion may occur in the metal.

  Therefore, in a resin reinforced metal part in which a CFRP reinforcing material is laminated on a metal part, the end of the CFRP reinforcing material is separated from the surface of the metal part, and even if moisture adheres, the carbon fiber between the CFRP reinforcing material and the metal part It is known from Patent Documents 1 to 3 below to prevent electrochemical corrosion of metal parts by cutting off the electrical continuity.

Japanese Unexamined Patent Publication No. 2013-212603 Japanese Unexamined Patent Publication No. 2013-212604 Japanese Unexamined Patent Publication No. 2013-212605

  By the way, when a CFRP reinforcing material is bonded to the surface of a metal part via a thermosetting adhesive to form a resin-reinforced metal part, if the adhesive is cured by heating and then cooled, a metal having a high coefficient of thermal expansion Residual shear stress is generated in the adhesive sandwiched between the CFRP reinforcing material having a small amount of thermal shrinkage and the coefficient of thermal expansion. If the resin reinforced metal part is used in the state where this residual shear stress exists, the adhesive is There is a possibility of peeling.

  The present invention has been made in view of the above circumstances, and in a resin-reinforced metal part in which a CFRP reinforcing material is bonded to the surface of a metal part via a thermosetting adhesive, the residual shear stress of the adhesive is reduced. The purpose is to prevent peeling of the adhesive and bending of the resin-reinforced metal part.

In order to achieve the above object, according to the present invention, there is provided a resin reinforced metal part in which a CFRP reinforcing material is bonded to a surface of a metal part with a thermosetting adhesive, and the bonding at an end of the CFRP reinforcing material. the thickness of the material is much larger than the thickness of the adhesive in the intermediate portion over the entire width of the end portion, and the residual shear stress of the adhesive in the end, the heating condition of said adhesive over A resin-reinforced metal part having the first characteristic that the thickness is smaller than the shear strength of the adhesive when the resin-reinforced metal part is used at a temperature of 80 ° C. Proposed.

According to the present invention, in addition to the first feature, there is provided a resin-reinforced metal part having a second feature in which a recess is formed on a surface of the metal part to which an end of the CFRP reinforcing material is bonded. Proposed.

According to the present invention, in addition to the second feature, there is proposed a resin-reinforced metal part having a third feature that the recess extends beyond a corner of the end portion of the CFRP reinforcement.

According to the present invention, in addition to the first feature, a resin-reinforced metal part having a fourth feature in which an end portion of the CFRP reinforcing material is bent away from the surface of the metal part is proposed. Is done.

According to the invention, in addition to any one of the first to fourth features, the metal part is a body frame part having a hollow closed cross section, and the CFRP reinforcing material is applied to a surface on which a tensile load acts. A resin-reinforced metal part having a fifth feature of being bonded is proposed.

According to the present invention, the first to be added to the fifth one of characteristics of the CFRP reinforcement of sixth to heat curing the adhesive in a state fixed with a clip to the metal component A featured resin reinforced metal part is proposed.

According to the present invention, in addition to the first to fourth any one feature, the CFRP reinforcement, resin that contains carbon continuous fibers oriented in the longitudinal direction and the seventh feature Reinforced metal parts are proposed.

According to the invention, in addition to the second feature, the CFRP reinforcing material includes continuous carbon fibers oriented in one direction, and the recess is formed along both ends of the CFRP reinforcing material in the one direction. A resin-reinforced metal part having the eighth feature is proposed.

According to the invention, in addition to the second feature, the CFRP reinforcing material may be a continuous carbon fiber oriented in two directions orthogonal to each other, or carbon oriented in multiple directions so as to have pseudo-isotropic properties. comprises continuous fibers, the recess resin reinforcing metal components to the ninth aspect of the being formed along the entire circumference of the CFRP reinforcement is proposed.

According to the first aspect of the present invention, the resin-reinforced metal part in which a CFRP reinforcing material is bonded to the surface of the metal part with a thermosetting adhesive has a thermal expansion coefficient of the metal part higher than that of the CFRP reinforcing material. Therefore, at the time of cooling after curing the thermosetting adhesive by heating, shear stress is applied to the adhesive sandwiched between the metal part and the CFRP reinforcement due to the difference in thermal shrinkage between the metal part and the CFRP reinforcement. Residual and the residual shear stress increases at the end of the CFRP reinforcement. Since the thickness of the adhesive at the end of the CFRP reinforcing material is larger than the thickness of the adhesive at the intermediate portion over the entire width of the end, the residual shear stress of the adhesive at the end of the CFRP reinforcing material is alleviated. , It is possible to prevent peeling of the adhesive.

Also, the heating conditions of the adhesive is over-baked, and when the use environment of the resin reinforcing metal component is a hot 80 ° C, shear strength of the adhesive is lowered to a predetermined intensity, the end of the CFRP reinforcement The thickness of the adhesive at the end is such that the residual shear stress of the adhesive at the end is smaller than the predetermined strength, so that it is ensured that the residual shear stress is greater than the predetermined strength and the adhesive is peeled off. Can be prevented.

According to the second feature of the present invention, since the concave portion is formed on the surface of the metal part to which the end portion of the CFRP reinforcing material is bonded, the thickness of the adhesive at the end portion of the CFRP reinforcing material is equal to the depth of the concave portion. The thickness can be increased.

According to the third feature of the present invention, the residual shear stress of the adhesive is maximized at the corner of the end, but the recess extends beyond the corner of the end of the CFRP reinforcement, so that the peeling is the most. It is possible to prevent peeling of the adhesive at the corners of the end portion of the CFRP reinforcing material that is easily generated.

According to the fourth feature of the present invention, since the end of the CFRP reinforcement is bent away from the surface of the metal part, the end of the CFRP reinforcement is bent without processing the recess in the metal part. Accordingly, the thickness of the adhesive at the end of the CFRP reinforcing material can be increased.

According to the fifth aspect of the present invention, the metal part is a body frame part having a hollow closed cross section, and the CFRP reinforcement is bonded to the surface on which the tensile load acts, so that the metal part is lighter than the metal reinforcement. Thus, the strength of the vehicle body skeleton component can be efficiently increased with a CFRP reinforcing material having a high tensile strength.

According to the sixth aspect of the present invention, since the adhesive is heat-cured in a state where the CFRP reinforcing material is fixed to the metal part with a clip, the adhesive is cured and the metal part and the CFRP reinforcing material are integrated. Up to this point, the CFRP reinforcing material is prevented from falling off or being displaced from the metal part.

According to the seventh aspect of the present invention, since the CFRP reinforcing material includes carbon continuous fibers oriented in the longitudinal direction, the carbon continuous fibers can increase the tensile strength of the CFRP reinforcing material.

According to the eighth aspect of the present invention, the CFRP reinforcing material includes carbon continuous fibers oriented in one direction, and the recesses are formed at both ends of the CFRP reinforcing material in one direction. While increasing the bending strength in one direction of the metal part, the peeling of the adhesive can be prevented by the recess.

According to a ninth aspect of the present invention, the CFRP reinforcing material includes carbon continuous fibers oriented in two directions orthogonal to each other, or carbon continuous fibers oriented in multiple directions so as to have pseudo-isotropic properties, Since the concave portion is formed on the entire circumference of the CFRP reinforcing material, it is possible to prevent the adhesive from being peeled off by the concave portion while increasing the bending strength of the resin-reinforced metal part in a plurality of directions with the CFRP reinforcing material.

FIG. 1 is a perspective view of a resin-reinforced metal part. (First embodiment) 2 is an enlarged sectional view taken along line 2-2 of FIG. (First embodiment) FIG. 3 is a view in the direction of arrows 3 in FIG. (First embodiment) FIG. 4 is an explanatory diagram of the residual shear stress acting on the adhesive. (First embodiment) FIG. 5 is a perspective view of a resin-reinforced metal part. (Second Embodiment) 6 is an enlarged sectional view taken along line 6-6 of FIG. (Second Embodiment) FIG. 7 is a plan view of the resin-reinforced metal part. (Third embodiment) FIG. 8 is a perspective view of a resin-reinforced metal part. (Fourth embodiment) 9 is an enlarged sectional view taken along line 9-9 of FIG. (Fourth embodiment)

11 Metal part 11a Recess 12 CFRP reinforcement 12a End 12b Corner 13 Adhesive 14 Carbon continuous fiber 16 Clip P Resin reinforced metal part

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

First embodiment

  First, as shown in FIGS. 1 to 3, a resin-reinforced metal part P has a strip-like CFRP (carbon fiber reinforced resin) reinforcing material 12 bonded to one surface of a metal part 11 made of a steel pipe having a square cross section. Bonded with the agent 13. The CFRP reinforcing material 12 is obtained by curing a prepreg in which a large number of continuous carbon fibers 14 arranged in one direction are embedded in a matrix resin 15. The orientation direction of the continuous carbon fibers 14 is the longitudinal direction of the CFRP reinforcing material 12. Match the direction. On one surface of the metal part 11 facing the two end portions 12a, 12a in the longitudinal direction of the CFRP reinforcing material 12, two concave portions 11a, 11a made of linear grooves along the end portions 12a, 12a are formed. A part of the adhesive 13 is filled in the recesses 11a and 11a to bond the end portions 12a and 12a of the CFRP reinforcing material 12 to positions beyond the corner portions 12b.

  If the thickness of the adhesive 13 in the portions other than the recesses 11a and 11a of the metal part 11 is t1, and the depth of the recesses 11a and 11a is d, the thickness of the adhesive 13 in the recesses 11a and 11a is t1 + d. The thickness of the adhesive 13 is increased by the depth d of 11a and 11a.

  In the manufacturing process of the resin-reinforced metal part P, when the thermosetting adhesive 13 is heated and cured at 170 ° C. in a heating furnace and then cooled, the coefficient of thermal expansion of the metal part 11 is the CFRP reinforcing material 12 and Since the thermal expansion coefficient of the metal part 11 is larger than the thermal contraction amount of the CFRP reinforcing material 12 and the adhesive 13 because the thermal expansion coefficient of the adhesive 13 is larger, the resin reinforced metal part P is closer to the CFRP reinforcing material 12 side. The metal part 11 side is curved so as to be convex and a residual shear stress is generated in the adhesive 13. When the residual shear stress is equal to or higher than the shear strength of the adhesive 13, the adhesive 13 is peeled off, and the CFRP reinforcing material 12 is peeled off from the metal part 11, so that the strength of the resin reinforced metal part P is lowered.

  As shown in FIG. 4, when a relative movement amount δ1 is generated between the metal part 11 and the CFRP reinforcing material 12 due to a difference in thermal expansion coefficient, a residual shear stress is generated in the adhesive 13 according to the relative movement amount δ1. At this time, even if the relative movement amount δ1 is the same, if the thickness of the adhesive 13 is t1, the residual shear stress is small τ1, but if the thickness of the adhesive 13 is small t2, the residual shear is The stress becomes large τ2. That is, the greater the thickness of the adhesive 13, the smaller the residual shear stress. Since the relative movement amount δ1 between the metal part 11 and the CFRP reinforcing material 12 becomes the maximum at the two end portions 12a and 12a in the longitudinal direction of the CFRP reinforcing material 12, the peeling of the adhesive 13 due to the residual shear stress is the end portion. It starts at 12a, 12a.

  In the present embodiment, since the concave portions 11a and 11a are formed on one surface of the metal part 11 corresponding to the end portions 12a and 12a of the CFRP reinforcing material 12 where the residual shear stress of the adhesive 13 is maximized, the concave portions 11a and 11a are formed. By increasing the thickness of the adhesive 13 by the depth d, it is possible to reduce the residual shear stress of the adhesive 13 at the end portions 12a and 12a and prevent the occurrence of peeling. For example, when the thickness of the adhesive 13 is increased from 0.5 mm to 1.5 mm, the residual shear stress is reduced by 40%.

  In the present embodiment, the thickness of the adhesive 13 at the ends 12a and 12a of the CFRP reinforcing material 12 is determined as follows. When the heating temperature when heating the high-toughness thermosetting adhesive 13 in a heating furnace exceeds 170 ° C., the shear strength of the adhesive 13 is 8. 9% lower. When the completed resin-reinforced metal part P is used in a high temperature environment of 80 ° C., the shear strength of the adhesive 13 is reduced by 40% with respect to the original shear strength.

  Accordingly, the adhesive 13 is overbaked over 170 ° C., and the use environment of the resin reinforced metal part P is set to the reference value of the shear strength of the adhesive 13 under the adverse condition of 80 ° C. The thickness of the adhesive 13 at the end portions 12a and 12a is determined so that the residual shear stress does not exceed the reference value of the shear strength. If the thickness of the adhesive 13 at the ends 12a and 12a of the CFRP reinforcing material 12 is determined in this way, the residual shear stress of the adhesive 13 can be prevented from exceeding the reference value of the shear strength even under the above-mentioned adverse conditions. Thus, peeling due to insufficient strength of the adhesive 13 is prevented.

  In FIG. 4, when the residual shear stress is the predetermined value τ1, if the thickness of the adhesive 13 is t1, the relative movement amount between the metal part 11 and the CFRP reinforcing material 12 becomes large δ1, If the thickness of the agent 13 is small t2, the relative movement amount between the metal part 11 and the CFRP reinforcing material 12 is small δ2. That is, when the residual shear stress is the predetermined value τ1, the relative movement amount between the metal part 11 and the CFRP reinforcement 12 increases as the thickness of the adhesive 13 increases. Residual shear stress due to the difference in shrinkage can be reduced.

  Of the end portions 12a, 12a of the CFRP reinforcing member 12 where the residual shear stress of the adhesive 13 increases, the residual shear stress of the adhesive 13 becomes maximum at the corner portions 12b. However, since the concave portions 11a and 11a of the metal part 11 are formed so as to cover the corner portions 12b of the end portions 12a and 12a, the residual shear stress of the adhesive 13 in the corner portions 12b is reliably reduced, and the corner portions It is possible to avoid the situation where the adhesive 13 is peeled off from 12b.

  Further, the CFRP reinforcing material 12 has the continuous carbon fibers 14 oriented along the longitudinal direction thereof, so that the tensile strength is maximized, and a load is applied to the central portion of the resin reinforced metal part P supported at both ends. The strength is effectively increased when bending by inputting.

  Next, a second embodiment of the present invention will be described based on FIG. 5 and FIG.

Second embodiment

In the first embodiment, the recesses 11a and 11a are formed in the metal part 11 so that the thickness of the adhesive 13 in the portions is increased over the entire width of the end portions 12a and 12a of the CFRP reinforcing material 12. However, in the second embodiment, the metal part 11 is not provided with the recesses 11a and 11a, and instead, the CFRP reinforcing material 12 is provided at the bent parts 12c and 12c near the end parts 12a and 12a. 11 is bent in a direction away from one surface.

According to the present embodiment, the thickness of the adhesive 13 is increased over the entire width of the end portions 12a and 12a at the end portions 12a and 12a of the CFRP reinforcing member 12 by the bent portions 12c and 12c. The same effect as that of the embodiment can be achieved. Moreover, since it is easier to form the bent portions 12c and 12c in the CFRP reinforcing material 12 than to form the recesses 11a and 11a in the metal part 11, it is possible to reduce the processing cost as a whole.

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

Third embodiment

  In the embodiment shown in FIG. 7A, the carbon continuous fibers 14 of the CFRP reinforcing material 12 are oriented in two directions orthogonal to each other, and the recesses 11a of the metal part 11 are all around the CFRP reinforcing material 12. Is formed so as to surround. Further, in the embodiment shown in FIG. 7B, the carbon continuous fibers 14 of the CFRP reinforcing material 12 are oriented in four directions of 0 °, 90 °, 45 °, and −45 ° to give pseudo-isotropic properties. The recesses 11 a of the metal part 11 are formed so as to surround the entire circumference of the CFRP reinforcing material 12.

  According to these embodiments, the CFRP reinforcing material 12 is laminated on the tensile side of the metal part 11, and the CFRP reinforcing material 12 is bonded to the metal part 11 while effectively exerting the reinforcing effect of the CFRP reinforcing material 12. It is possible to prevent the adhesive 13 to be peeled off by the residual pre-stress by the recesses 11a.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS.

Fourth embodiment

  In the fourth embodiment, the resin-reinforced metal part P of the first embodiment is applied to a vehicle body part. The center pillar of an automobile is configured by joining a center pillar inner located on the inner side of the vehicle body and an outer center pillar located on the outer side of the vehicle body with a joining flange, and has a closed cross section. Is applied to the center pillar inner.

  The metal component 11 constituting the center pillar inner includes a main body portion 11b having a groove-shaped cross section, a pair of joint flanges 11c and 11c bent at both ends in the width direction of the main body portion 11b, and a central portion in the width direction of the main body portion 11b. A CFRP reinforcing material 12 having a hat-shaped cross section is bonded to the inner surface of the member with an adhesive 13. A pair of recesses 11a, 11a is formed in the metal part 11 facing the two end portions 12a, 12a in the longitudinal direction of the CFRP reinforcing material 12, and a part of the adhesive 13 is filled in the recesses 11a, 11a. The thickness of the adhesive 13 is larger at the concave portions 11a and 11a than at the other portions.

  The metal part 11 and the CFRP reinforcing material 12 are temporarily fixed by a plurality of clips 16... Until the adhesive 13 is heat-cured, and the CFRP reinforcing material 12 is detached or displaced from the metal part 11. The CFRP reinforcing material 12 is temporarily fixed so that it does not.

  When the car falls down, the roof is deformed toward the passenger compartment and the upper part of the center pillar is bent toward the inner side in the vehicle width direction, so that the inner part in the vehicle width direction of the center pillar inner of the center pillar of the closed section is pulled and deformed . Since the center pillar inner that undergoes tensile deformation is configured by bonding the metal part 11 and the CFRP reinforcing material 12 with the adhesive 13, the CFRP reinforcing material 12 having high tensile strength can suppress tensile deformation.

  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, a vehicle body skeleton component to which the present invention is applied is not limited to a center pillar.

Claims (9)

A resin reinforced metal part in which a CFRP reinforcing material (12) is bonded to the surface of a metal part (11) with a thermosetting adhesive (13),
The thickness of the adhesive (13) at the end (12a) of the CFRP reinforcing material (12) is larger than the thickness of the adhesive (13) at the intermediate portion over the entire width of the end (12a). And the residual shear stress of the adhesive (13) at the end (12a) is that the heating condition of the adhesive (13) is overbaked, and the usage environment of the resin-reinforced metal part (P) is resin reinforced metal part, wherein the thickness der Rukoto be less than the shear strength of the adhesive (13) when it is hot 80 ° C. The resin-reinforced metal part according to claim 1, wherein a concave part (11a) is formed on a surface of the metal part (11) to which an end part (12a) of the CFRP reinforcing material (12) is bonded. The resin-reinforced metal part according to claim 2 , wherein the recess (11a) extends beyond a corner (12b) of an end (12a) of the CFRP reinforcement (12). The resin-reinforced metal part according to claim 1, wherein an end (12a) of the CFRP reinforcement (12) is bent in a direction away from the surface of the metal part (11). The metal part (11) is a vehicle body framework component of the hollow closed section, characterized in that the tensile load is adhered to the CFRP reinforcement on the surface to act (12), one of claims 1 to 4 The resin-reinforced metal part according to claim 1. Characterized by heat-curing the adhesive (13) the CFRP reinforcement material (12) in a state of being fixed with a clip (16) to said metal part (11), any one of claims 1 to 5 The resin-reinforced metal part according to item 1. The resin-reinforced metal part according to any one of claims 1 to 4 , wherein the CFRP reinforcing material (12) includes carbon continuous fibers (14) oriented in a longitudinal direction thereof. The CFRP reinforcement (12) includes continuous carbon fibers (14) oriented in one direction, and the recess (11a) is formed along both ends of the CFRP reinforcement (12) in the one direction. The resin-reinforced metal part according to claim 2 , wherein The CFRP reinforcing material (12) includes carbon continuous fibers (14) oriented in two directions orthogonal to each other, or carbon continuous fibers (14) oriented in multiple directions so as to have pseudo-isotropic properties, and the recesses The resin-reinforced metal part according to claim 2 , wherein (11a) is formed along the entire circumference of the CFRP reinforcing material (12).

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