KR20190055376A - Reinforcement member for car pillar and manufacturing method for the same - Google Patents

Abstract

According to one embodiment of the present invention, provided is a reinforcement material for a vehicle pillar, which comprises a front portion placed in the front of a pillar, a rear portion placed in the rear of the pillar, and an intermediate portion bent while connecting the front portion and the rear portion. In the front portion and the intermediate portion, a first reinforcing material and a second reinforcing material having a carbon fiber reinforced composite material are laminated, and a carbon fiber contained in the first reinforcing material placed in the front portion is arranged in the same direction as a direction in which the front portion extends. A carbon fiber contained in the first reinforcing material placed in the intermediate portion is arranged in a direction of ± 40-50 degrees with respect to a direction in which the carbon fiber positioned in the front portion extends.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filler reinforcing material for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle filler reinforcement and a method of manufacturing the same.

The pillar of the vehicle is generally composed of A, B, and C fillers, which are used mainly to protect the passenger in the event of a vehicle collision, and are mainly made of metal.

The weight of the vehicle increases when the reinforcing material is used in a large amount and the size of the A filler located in the front part of the vehicle is made smaller in order to secure the visibility of the driver. The strength of the A filler is inevitably weakened.

Accordingly, attempts have been made to apply fiber-reinforced composite materials, which can be made lighter in weight to increase the strength of the vehicle filler, while securing strength, as a reinforcing material.

Examples of the method for producing a reinforcing material formed of a fiber reinforced composite material include press molding, RTM (resin transfer molding) molding, FW (filament winding) molding, autoclave molding, injection molding, drawing molding, There are various methods. In the production of automotive fillers, mainly press molding using a prepreg or RTM molding method using a woven fabric is used, and in the case of a cylindrical molded product, a braiding method and an RTM molding method are used.

However, in the case of the braiding molding, since the physical properties of the directional material corresponding to the direction in which the filler extends are lower than the prepreg, the light weighting rate may be lowered to obtain a certain level of strength or more, and in the case of press molding using prepreg, There is a problem in that the productivity is low.

Particularly, in the case of an A-pillar reinforcement having a narrow cross-section and a folded structure of a filler, the manufacturing process is complicated and difficult, and thus, Is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a filler reinforcing material for a vehicle having excellent mass productivity and light weight, and having excellent strength, and a method of manufacturing the same.

According to an embodiment of the present invention, there is provided a pillar comprising: a front portion located forward of a pillar; a rear portion located behind the pillar; and a middle portion bent between the front portion and the rear portion, And the intermediate portion includes a first reinforcing member and a second reinforcing member stacked together, the first reinforcing member including a carbon fiber-reinforced composite material, and the carbon fibers contained in the first reinforcing member located at the front portion are in the same direction as the direction in which the front portion extends And the carbon fibers included in the first reinforcing member located in the middle portion are arranged in a direction of +/- 40 to 50 degrees with respect to a direction in which the carbon fibers positioned in the front portion extend.

The rear portion may have the second reinforcing material stacked.

The rear portion may have the first reinforcing member and the second reinforcing member stacked.

The first stiffener of the front portion is 1 to 5.5 mm, the second stiffener is 1 to 17 mm, the first stiffener of the rear portion is 1 to 4.2 mm, the second stiffener is 1 to 7.8 mm, 1 stiffener may have a thickness of 1 to 8.8 mm, and the second stiffener may have a thickness of 1 to 20 mm.

According to another embodiment of the present invention, a carbon fiber prepreg is laminated and formed on a mold or a mandrel including a front portion, a rear portion, and an intermediate portion bent from the front portion and the rear portion to form a first reinforcing material Forming a second reinforcing member by laminating carbon fibers on the first reinforcing member by braiding and injecting and hardening a matrix resin, and removing the mold or the mandrel, wherein the front portion Wherein the carbon fibers contained in the first reinforcing member are arranged in the same direction as the direction in which the front portion extends, and the carbon fibers contained in the first reinforcing member located in the middle portion are arranged in the front portion The present invention provides a method for manufacturing a vehicle filler reinforcement arranged in a direction of +/- 40 to 50 degrees with respect to a direction in which carbon fibers extend.

INDUSTRIAL APPLICABILITY As described above, according to the automotive pillar reinforcement according to one embodiment of the present invention and the method of manufacturing the same, it is possible to realize mass production with excellent mass productivity, and excellent strength.

1 is a side view showing a vehicle pillar according to an embodiment of the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
3 is a photograph of a vehicle filler manufactured according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. It will be understood that when an element such as a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the element directly over another element, Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. Also, although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described herein.

Hereinafter, a vehicle filler reinforcement according to an embodiment of the present invention and a method of manufacturing the same will be described in detail with reference to FIGS. 1 and 2. FIG.

FIG. 1 is a side view showing a vehicle pillar according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG.

First, a vehicle filler reinforcement according to an embodiment of the present invention will be described.

The filler reinforcing material for a vehicle according to the embodiment of the present invention includes a front portion 10 positioned in front of a filler, a rear portion 20 positioned behind a filler, and a front portion 10 and a rear portion 20, As shown in FIG.

The filler reinforcement may be formed of a carbon fiber reinforced composite material, and the carbon fiber reinforced composite material may include a carbon fiber and a matrix resin impregnated in the carbon fiber.

The matrix resin may include an epoxy resin, a polyester resin, a vinyl ester resin, and the like, but may not be limited thereto and may include various resins.

The filler reinforcement according to the embodiment of the present invention may be in the form of a laminate of the first reinforcement 50 and the second reinforcement 55.

The first stiffener 50 of the front portion 10 may be laminated to a thickness of 1 to 5.5 mm and the second stiffener 55 may be laminated to a thickness of 1 to 17 mm and the first stiffener 50 And the second stiffener 55 may be laminated to a thickness of 1 to 7.8 mm and the first stiffener 50 of the middle portion 30 may have a thickness of 1 to 8.8 mm, The second stiffener 55 may be laminated to a thickness of 1 to 20 mm.

In this thickness range, it is possible to realize a light weight and secure sufficient strength.

The carbon fibers contained in the first reinforcing member 50 located at the front portion 10 of the filler reinforcing member may be arranged in the same direction as the direction in which the front portion 10 extends .

The carbon fibers included in the first reinforcing member 50 located at the rear portion 20 of the filler reinforcing member may also be arranged in the 0 degree direction with respect to the direction in which the rear portion 20 extends.

The carbon fibers contained in the first reinforcing material 50 located in the intermediate portion 30 of the filler reinforcing material may be in the range of about 40 to about 40 times the carbon fibers of the first reinforcing material 50 located in the front portion 10, 50 degrees, and preferably in a direction of +/- 45 degrees.

The vehicle pillar reinforcement according to the embodiment of the present invention has been described in which the first reinforcing member 50 and the second reinforcing member 55 are laminated on the front portion 10, the middle portion 30 and the rear portion 20 The front portion 10 and the middle portion 30 are stacked with the first stiffener 50 and the second stiffener 55 and the rear portion 20 is formed by stacking only the second stiffener 55 Structure.

Next, a method for manufacturing a vehicle-use pillar reinforcement according to an embodiment of the present invention will be described.

The manufacture of a vehicle pillar reinforcement according to an embodiment of the present invention includes the steps of forming a first reinforcing material 50 through a carbon fiber prepreg lamination and molding on a mold or a mandrel, braiding method, injecting and hardening a matrix resin to form a second reinforcing material 55, and removing the mold or the mandrel.

Hereinafter, each step will be described in order.

First, a first reinforcing material 50 is formed through a carbon fiber prepreg lamination and molding in a mold or a mandrel.

The carbon fiber prepreg can be a unidirectional (UD) prepreg. The first reinforcing material 50 can be formed by laminating a carbon fiber prepreg on a mold or a mandrel and then applying heat thereto.

The first stiffener 50 of the front part 10 has a thickness of 1 to 5.5 mm and the first stiffener 50 of the rear part 20 has a thickness of 1 to 4.2 mm, May be laminated to a thickness of 1 to 8.8 mm.

In this thickness range, it is possible to realize a light weight and secure sufficient strength.

The front portion 10 of the filler reinforcing member can be formed such that the carbon fibers are arranged in the 0 degree direction with respect to the direction in which the front portion 10 extends.

The rear portion 20 of the filler reinforcing member can be formed such that the carbon fibers are arranged in the 0 degree direction with respect to the direction in which the rear portion 20 extends.

The intermediate portion 30 of the filler reinforcement may be formed such that the carbon fibers are arranged in the direction of +/- 40 to 50 degrees with respect to the direction in which the carbon fibers located in the front portion 10 extend, As shown in Fig.

Next, a carbon fiber is laminated on the formed first stiffener 50 by a braiding method, and a matrix resin is injected and cured to form a second reinforcing material 55.

The second stiffener 55 of the front portion 10 is 1 to 17 mm thick and the second stiffener 55 of the rear portion 20 is 1 to 7.8 mm thick. The second stiffener 55 may be laminated to a thickness of 1 to 20 mm.

The second reinforcing material 55 may be formed by forming a carbon fiber by a braiding method in three or two axes, and then injecting and curing a matrix resin.

Thereafter, the mold or mandrel is removed to complete the filler reinforcing material for a vehicle according to the embodiment of the present invention.

The actual manufactured vehicle filler reinforcement is shown in Fig.

Hereinafter, the structure and effect of the present invention will be described in more detail with reference to examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

Example 1

A mandrel was produced by compression molding of a urethane foam in a mold, and a carbon fiber prepreg (CU150NS, Korea Carbon Co., Ltd.) was laminated on the mandrel. At this time, the front part is laminated so that the carbon fibers are arranged in the direction of 0 degrees with respect to the direction in which the front part extends, and the middle part is laminated so that the carbon fibers are arranged in the direction of +/- 45 degrees with respect to the direction in which the carbon fibers arranged in the front part extend, The rear portion was laminated so that the carbon fibers were arranged in the 0 degree direction with respect to the direction in which the rear portion extended. The carbon fiber prepregs laminated on the front part, the middle part and the rear part were laminated to have a thickness of 3.5 mm.

A hot press was preheated at 120 deg. C and a mandrel having a carbon fiber prepreg laminated thereon was put into a mold, and then molded at 120 DEG C and 1 MPa pressure for 1 hour to prepare a first reinforcing material.

The carbon fiber (T700SC-12K-50C, Toray Hi-tech) is braided on the first stiffener with three axes of 0 degrees / +45 degrees / -45 degrees using a braiding machine (FAW360gsm) Respectively.

(SIC-500R / L, Shin-A T & C) was injected into the mold at 120 ° C under a pressure of 3 MPa for 5 minutes and cured for 30 minutes to prepare a second reinforcing material.

The mandrel was then removed to produce a hollow A filler reinforcement.

Example 2

A mandrel was produced by compression molding of a urethane foam in a mold, and a carbon fiber prepreg (CU150NS, Korea Carbon Co., Ltd.) was laminated on the mandrel. At this time, the front portion was laminated such that the carbon fibers were arranged in the 0 degree direction with respect to the direction in which the front portion extended, and the middle portion was laminated such that the carbon fibers were arranged in the direction of +/- 45 degrees with respect to the direction in which the carbon fibers arranged in the front portion extended. The carbon fiber prepregs laminated on the front portion and the middle portion were all laminated to have a thickness of 3.5 mm.

A hot press was preheated at 120 deg. C and a mandrel having a carbon fiber prepreg laminated thereon was put into a mold, and then molded at 120 DEG C and 1 MPa pressure for 1 hour to prepare a first reinforcing material.

Thereafter, a mandrel of the rear portion was connected, and carbon fibers (T700SC-12K-50C, Toray Advanced Material) were stuck to the first stiffener of the front portion and the middle portion of the rear portion and the mandrel of the rear portion using a braiding machine (FAW360gsm) / -45 degrees in three axes.

(SIC-500R / L, Shin-A T & C) was injected into the mold at 120 ° C under a pressure of 3 MPa for 5 minutes and cured for 30 minutes to prepare a second reinforcing material.

The mandrel was then removed to produce a hollow A filler reinforcement.

Comparative Example 1

A mandrel was produced by compression molding of a urethane foam in a mold, and a carbon fiber prepreg (CU150NS, Korea Carbon Co., Ltd.) was laminated on the mandrel. At this time, the front part is laminated so that the carbon fibers are arranged in the direction of 0 degrees with respect to the direction in which the front part extends, and the middle part is laminated so that the carbon fibers are arranged in the direction of +/- 45 degrees with respect to the direction in which the carbon fibers arranged in the front part extend, The rear portion was laminated so that the carbon fibers were arranged in the 0 degree direction with respect to the direction in which the rear portion extended. The carbon fiber prepregs stacked on the front side were laminated to a thickness of 5.5 mm, the carbon fiber prepregs laminated on the middle side were 8.8 mm thick, and the carbon fiber prepregs laminated on the rear side were 4.2 mm thick.

A hot press was preheated at 120 deg. C and a mandrel having a carbon fiber prepreg laminated thereon was put into a mold, and then molded at 120 DEG C and 1 MPa pressure for 1 hour to prepare a first reinforcing material.

The mandrel was then removed to produce a hollow A filler reinforcement.

Comparative Example 2

(T700SC-12K-50C, manufactured by Toray Advanced Material Co., Ltd.) was placed on a mandrel using a braiding machine (FAW360gsm) at a temperature of 0 degree / +45 degrees / -45 degrees Three-axis braiding was performed.

At this time, the front portion was laminated to a thickness of 17 mm, the middle portion to a thickness of 20 mm, and the rear portion to a thickness of 7.8 mm.

(SIC-500R / L, Shin-A T & C) was injected into the mold at 120 ° C under a pressure of 3 MPa for 5 minutes and cured for 30 minutes to prepare a second reinforcing material.

The mandrel was then removed to produce a hollow A filler reinforcement.

Comparative Example 3

The carbon fiber prepreg as the first reinforcing material was arranged such that the direction of arrangement of the carbon fibers was 0 degree in both the front part, the middle part and the rear part. The front part was 3.5 mm thick, the middle part was 0.4 mm thick, A hollow type A filler reinforcing material was prepared in the same manner as in Example except that the second reinforcing material was laminated with a front portion of 5.3 mm thick, a middle portion of 14 mm thick, and a rear portion of 4.5 mm thick.

Comparative Example 4

A hollow A filler reinforcing material was prepared in the same manner as in Example except that carbon fiber prepregs located in the middle portion of the first reinforcing material were arranged so that the direction of arrangement of carbon fibers was ± 30 degrees.

Comparative Example 5

A hollow A filler reinforcing material was prepared in the same manner as in Example except that carbon fiber prepregs located in the middle portion of the first reinforcing material were arranged so that the direction of arrangement of carbon fibers was ± 60 degrees.

Experimental Example

(1) Weighing

The weight of the hollow A filler reinforcement prepared according to Examples 1 to 2 and Comparative Examples 1 to 5 was measured.

(2) A-pillar forward deflection measurement

The A-pillar frontal deformation was measured by FEM analysis, and the results were derived by linear static analysis using the Nastran program and the optimization using the Genesis program.

The results are shown in Table 1 below.

Weight (kg) A Amount of deformation of the front part of the pillar (mm) Example 1 1.50 1.60 Example 2 1.47 1.60 Comparative Example 1 1.69 2.30 Comparative Example 2 3.59 3.30 Comparative Example 3 2.33 2.60 Comparative Example 4 1.47 3.40 Comparative Example 5 1.47 2.30

As shown in Table 1, Examples 1 and 2, in which the first reinforcing material and the second reinforcing material were laminated together, showed the lightening effect and the least amount of deformation of the front portion of the A pillar. In Comparative Examples 1 to 5, Which is larger than those of Examples 1 and 2.

INDUSTRIAL APPLICABILITY As described above, according to the automotive pillar reinforcement according to the embodiment of the present invention and its manufacturing method, it is possible to realize mass production with excellent mass productivity, and excellent strength.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

10: front portion 20: rear portion
30: Middle section

Claims (7)

A front portion located in front of the filler,
A rear portion located behind the pillar, and
And a middle portion bent between the front portion and the rear portion,
Wherein the front portion and the middle portion are laminated with a first reinforcing material and a second reinforcing material including a carbon fiber reinforced composite material,
The carbon fibers included in the first reinforcing member located in the front portion are arranged in the same direction as the direction in which the front portion extends,
Wherein the carbon fibers included in the first reinforcing member located at the intermediate portion are arranged in a direction of +/- 40 to 50 degrees with respect to a direction in which the carbon fibers positioned in the front portion extend. The method of claim 1,
And the rear portion is formed by laminating the second reinforcing member. The method of claim 1,
And the rear portion has the first reinforcing member and the second reinforcing member laminated. 4. The method of claim 3,
The first stiffener of the front portion is 1 to 5.5 mm, the second stiffener is 1 to 17 mm, the first stiffener of the rear portion is 1 to 4.2 mm, the second stiffener is 1 to 7.8 mm, 1 reinforcing material is 1 to 8.8 mm, and the second reinforcing material is laminated to a thickness of 1 to 20 mm. Forming a first reinforcing material by laminating and forming a carbon fiber prepreg on a mold or a mandrel including a front portion, a rear portion, and an intermediate portion bent to the front portion and the rear portion;
Stacking carbon fibers on the first stiffener by a braiding process, injecting and hardening a matrix resin to form a second stiffener, and
Removing the mold or the mandrel,
The carbon fibers included in the first reinforcing member located in the front portion are arranged in the same direction as the direction in which the front portion extends,
Wherein the carbon fibers contained in the first reinforcing member located at the intermediate portion are arranged in a direction of +/- 40 to 50 degrees with respect to a direction in which the carbon fibers positioned in the front portion extend. The method of claim 5,
And the carbon fibers included in the first reinforcing member located at the rear portion are arranged in the same direction as the extending direction of the rear portion. The method of claim 6,
The first stiffener of the front portion is 1 to 5.5 mm, the second stiffener is 1 to 17 mm, the first stiffener of the rear portion is 1 to 4.2 mm, the second stiffener is 1 to 7.8 mm, 1 reinforcing member is 1 to 8.8 mm, and the second reinforcing member is laminated to a thickness of 1 to 20 mm.

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