JP2007313919A - Vehicular panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly forecast the destruction form of a vehicular panel at a collision and to facilitate the design of a safety structure. <P>SOLUTION: The vehicular panel is used as an outer sheath member and an interior member of a vehicle. In the panel 10, a fragile part 30 having weaker rupture strength than the other portion (main panel part 20) in a surface direction by partially making a composition material different is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a panel for use as an exterior member or interior member of various vehicles, and relates to a vehicle panel having a partially different breaking strength.

  In recent years, in the field of automobiles, in order to reduce the weight of the car body, instead of conventional steel or aluminum alloy fibers, this is a fiber in which synthetic fibers are mixed with reinforcing fibers to increase their strength. A fiber board using a reinforced plastic (FRP) or mixed with a binder resin for binding to natural fibers has been proposed. As a thing using a fiber board, there exists patent document 1, for example. In order to eliminate the occurrence of delamination, the fiber board of Patent Document 1 has a single-layer structure, and gradually increases hardness from one side surface in the thickness direction to the other side surface or from the center in the thickness direction to both side surfaces. It is different.

JP 2000-141524 A

  The fiber board of Patent Document 1 can also be used as a panel member for interior and exterior of a vehicle, and in order to join it to a vehicle body, it is fixed with a nail, a bolt or the like, or an adhesive is used. Furthermore, recently, depending on the application location, there has been a high demand for joining panel members. In this case, joining with an adhesive is the most efficient. When bonding panel members made of fiberboard with an adhesive, it is naturally desirable to use an adhesive with high adhesive strength so that it does not easily peel off from the object to be bonded. However, at this time, the peeling mechanism of the panel member when an external impact such as a collision is applied becomes a problem. The mechanism by which the panel member is peeled off from the object to be bonded by external impact is roughly divided into a cohesive failure mechanism in which the panel member is peeled off by cohesive failure of the adhesive and a base material breaking mechanism in which the panel member itself is broken and peeled off. If an adhesive having a relatively weak adhesive strength is used, the adhesive strength of the adhesive becomes smaller than the fracture strength of the panel member, and a cohesive failure mechanism is formed. Conversely, if an adhesive having a strong adhesive strength is used, the adhesive is used. It is clear that the adhesive strength of the base material becomes larger than the fracture strength of the panel member and becomes a base material fracture mechanism.

  However, the adhesive strength of the adhesive is not necessarily constant depending on various external environments such as temperature and humidity during application. In addition, when the adhesive strength is strong and the base material destruction mechanism is used, it is difficult to predict which part of the panel member will cause the base material destruction. In this case, even if the same adhesive is used, depending on the environment at the time of application, it may be a base material destruction mechanism or a cohesive failure mechanism, and the break location of the panel member is not constant, It becomes difficult to predict the destruction mode of the panel member at the time of a vehicle collision, and the design of the collision safety structure for ensuring the safety of passengers is hindered. When a non-metallic material is used as a panel member as in the invention described in Patent Document 1, when an impact due to a collision accident or the like is applied, there is a risk of not only bending like a metal but also breaking and scattering. high. For this reason as well, when a non-metallic material is used as the panel member, the design of the collision safety structure is an important matter.

  By increasing the breaking strength of the panel member and the adhesive strength of the adhesive, there is a limit to be able to withstand the impact at the time of collision, which is not efficient in terms of productivity and cost. Therefore, as a result of intensive studies by the present inventors, instead of increasing the breaking strength to the limit, conversely, if a weak portion with weak breaking strength is provided and the portion is preferentially broken, the breaking mode at the time of collision Therefore, the present invention has been completed.

  That is, the problem to be solved by the present invention is to accurately predict the destruction mode of the vehicle panel at the time of a collision and to facilitate the design of the safety structure.

  As a means for solving the above-mentioned problems, the present invention according to claim 1 is a vehicle panel used as an exterior member or interior member of a vehicle, the panel partially comprising a composition material thereof. By making it different, a weak portion having a weaker fracture strength than the other portions in the surface direction is provided. In other words, by using a composition material that has a lower mechanical strength than the composition material used in the other part of the part in the plane direction of the vehicle panel, the strength of the fracture is partially varied to provide the strength. ing. The “other part” here means a part that can exhibit the original function of the panel. Further, the “fragile” of the weak part means that it is weaker than other parts, and does not necessarily need to be weaker than the mechanical strength standard of a general vehicle panel. By setting it as such a structure, when a big impact at the time of a collision acts on the panel for vehicles, a weak part will be destroyed in preference to another part. As the previous stage, the fragile part is compressed in preference to the other part, so it can function as an impact energy absorbing part. The main composition material used for the vehicle panel according to claim 1 may be wood fiber, inorganic fiber, wood piece or the like.

  According to a second aspect of the present invention, in the vehicle panel according to the first aspect, the weak portion is sandwiched between the other portions, and is provided in an intermediate region in the surface direction of the panel. Here, “provided in the intermediate region” means that the fragile portion is positioned other than the end portion of the panel, and does not need to be the center position in the front-rear direction or the left-right direction of the panel. According to a third aspect of the present invention, the vehicle panel according to the first or second aspect is a molded product of a fiber mat in which a fiber material and a binder resin for binding the fiber material are mixed. In addition, the present invention described in claim 4 provides the strength of breaking strength in the vehicle panel described in claim 3 by making the composition of the fiber material different. Alternatively, as in the fifth aspect of the present invention, the strength of the breaking strength in the vehicle panel according to the third aspect may be provided by changing the composition of the binder resin.

  In the present invention according to claim 6, first, the fiber material and the binder resin are mixed, and the composition material thereof is partially made different so that the fragile portion having a weaker fracture strength than the other portions in the surface direction. A fiber mat provided with is prepared. Next, a vehicle panel molded into a predetermined shape can be manufactured by hot pressing the fiber mat.

  According to the first aspect of the present invention, since the fragile portion having a weaker fracture strength than the other portion is provided in the plane direction, if an impact such as a collision acts on the panel, the fragile portion is It is destroyed in preference to the part. Therefore, it is possible to accurately predict the panel breaking mode at the time of collision at the time of designing the vehicle, and to facilitate the design of the safety structure. Depending on the magnitude and direction of the impact acting on the vehicle body, if the panel does not break or before it breaks, the weakened part is compressed with priority over other parts. Since it can function also as an energy absorption part, the safety | security of a vehicle can be improved more. Even when the panels are joined by an adhesive, an adhesive having a high adhesive strength can be used so as not to be easily peeled off by applying an adhesive to another portion having sufficient strength. Even if an adhesive having high adhesive strength is used, the location where the base material is broken can be made constant, and the influence of variations in adhesive strength due to the environment during application can be avoided. Furthermore, it is not necessary to consider the balance between the adhesive strength of the adhesive and the breaking strength of the panel in the design of the vehicle panel.

  For example, when panels are joined to each other, if the weak part is formed in the joint part with another panel, the main part of the weak part that is destroyed in preference to the other part cannot be fully exhibited. . Therefore, according to the second aspect of the present invention, the weakened portion is sandwiched between the other portions and is provided in an intermediate region in the panel surface direction (not necessarily at the center position in the panel surface direction). Therefore, when the panels are joined to each other, there is no fragile portion at the outer peripheral edge (end portion) where the joint with the other panel is formed. The effect can be exerted greatly, and the destruction mode of the panel is still easy to predict. In addition, it is easy to assemble without forcibly avoiding the weak part and joining the panels together.

  According to this invention of Claim 3, higher intensity | strength can be ensured by mix | blending a fiber material rather than shape | molding a panel with a resin single-piece | unit. In particular, when the main composition material of the panel is wood fiber, the vehicle can be lightened while securing the strength. In addition, if wood fiber is used as the main composition material, it has less impact on global warming as if fossil resources were used when incinerating the panels, and it is not a finite resource, so it is friendly to the global environment. .

  According to the present invention described in claims 4 and 5, since the strength of the fracture strength can be provided only by partially differentiating the fiber material or binder resin as the composition material, it is necessary to employ a complicated structure. Productivity is high.

  For example, when manufacturing a weak panel and other parts separately and then joining them together to produce a single panel, the joining operation is complicated, and at the boundary between the weak part and the other part. Not a few steps and grooves will occur. However, according to the present invention described in claim 6, since one panel is manufactured from one fiber mat, the smoothness of the boundary portion between the fragile portion and the other portion is high, and the productivity and design are improved. The property is also high.

  Embodiments of a vehicle panel according to the present invention will be described below with reference to the drawings. FIG. 1 shows a longitudinal sectional view of a vehicle panel according to the present invention. FIG. 2 is an explanatory view showing a destructive form of the vehicle panel according to the present invention. FIG. 3 shows an example of a method for joining vehicle panels according to the present invention. FIG. 4 is an explanatory view showing a manufacturing process of the vehicle panel according to the present invention.

  In FIG. 1, the panel body 10 of the present embodiment is provided with a weakened portion 30 having a weaker breaking strength than the other portion (main panel portion 20) in the surface direction by partially changing the composition material thereof. ing. That is, the panel body 10 of the present embodiment has a main panel portion 20 that occupies most of the panel main body and exhibits an original function as a panel, and a fragile portion 30 having a weaker breaking strength than this, The fragile portion 30 is provided in an intermediate region in the surface direction of the panel body 10 while being sandwiched between the main panel portions 20. And the weak part 30 uses the composition material whose mechanical strength is weaker than the composition material currently used for the main panel part 20, By making the fracture strength of the panel main body 10 partially different, the strength is weakened. It is the provided structure.

  In addition, the vehicle panel of the present embodiment can be applied to various vehicles such as automobiles, trains, trains, and freight cars, and is preferably used for automobiles. When used in automobiles, it can be used as exterior members such as bumpers, fenders, door panels, front panels, rear panels, or as interior members such as door trims, inner panels, pillar garnishes, rear packages, ceiling base materials, and shock absorbers. it can. Even when used as an exterior member or interior member of an automobile, the destruction mode of the fiber board according to the present invention is constant. Therefore, the destruction mode can be easily predicted at the time of designing the automobile, which is advantageous in improving safety.

  That is, as can be seen from the vehicle panel destruction mechanism shown in FIG. 2, when the vehicle panel of this embodiment is used as an exterior member of a vehicle, it is one side or both sides of the front and rear or the left and right due to a vehicle collision or the like. When the impact energy E acts in the plane direction from the first, the weak part 30 having a low breaking strength is first compressed in preference to the other part (main panel part 20). Next, when a compressive force is further applied in the plane direction by the impact energy E from this state, the vehicle panel cannot maintain its shape and buckles (buckles) from the fragile portion 30 to break the vehicle panel. It will be. In this way, by providing the vehicular panel with the weakened portion 30 having a lower breaking strength than the other portions, it is possible to design the vehicular panel breakage point at an arbitrary place and to accurately determine the breakage mode. Can be predicted. Further, since the fragile portion 30 is compressed prior to buckling, the fragile portion 30 also functions as an impact energy absorbing portion although it is slightly.

  As a main composition material used for the vehicle panel, a fiber material or a wood piece made of wood fiber or inorganic fiber can be used. Specifically, the wood fiber is a fiber that can be collected from trees and herbs. As woody species, coniferous trees such as cedar and cypress, broad-leaved trees such as shii, oak, cherry, and tropical trees can be used, and as herbs, bast plants that are easy to obtain good quality fibers are preferable, Examples include kenaf, ramie (linen), linen (flax), abaca (manila hemp), heneken (sisal hemp), jute (cannabis), hemp (palm), palm, palm, mulberry, straw and bagasse. Further, mechanical pulp, chemical pulp, semi-chemical pulp, and various artificial cellulosic fibers synthesized from these pulps may be used. Examples of the inorganic fiber include glass fiber, carbon fiber, and metal fiber. As the wood piece, for example, wood chips, wood flakes or wood powder obtained from thinned wood, wood ends, waste wood or the like can be used.

  In addition, a binder resin for binding the main composition material is mixed in the vehicle panel. The binder resin is not particularly limited as long as it functions as an adhesive for the main composition material, and various thermoplastic resins and thermosetting resins can be used. Typical examples of the thermoplastic resin include well-known synthetic resins such as polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and vinyl chloride. Examples of the thermosetting resin include a phenol resin, an epoxy resin, a melamine resin, and an unsaturated polyester resin, and lignin obtained from higher plants can also be used. These binder resins can be used in various forms such as powder, fiber and solvent solution.

  These composition materials can be arbitrarily selected for the vehicle panel. In general, a board or mat mainly composed of inorganic fibers, wood fibers, and wood fragments has a high breaking strength in this order. Utilizing this characteristic, the composition of the main panel portion 20 is inorganic fiber, and the composition of the fragile portion 30 is wood fiber. The composition of the main panel portion 20 is inorganic fiber, and the composition of the fragile portion 30 is a wood piece. The composition of the main panel 20 is made of wood fiber, and the composition of the fragile part 30 is made of wood. Furthermore, although the main panel part 20 and the weak part 30 are the same wood fiber etc., the combination which makes a specific material different is also considered. Moreover, you may provide the strength of fracture strength by varying the composition of binder resin. As described above, there are a wide variety of combinations of the composition materials used for the main panel portion 20 and the fragile portion 30. In short, if the fragile portion 30 has a lower breaking strength than the main panel portion 20, It is not particularly limited.

  The mixing ratio of the main composition material such as a fiber material is not particularly limited, but it is preferably 50 to 90% by weight with respect to the total weight of the vehicle panel to be obtained, for example. More preferably, the mixed fiber material is 50 to 70% by weight with respect to the total weight of the vehicle panel to be obtained. That is, in the vehicle panel, the ratio between the fiber material and the binder resin is 50:50 to 90:10, preferably 50:50 to 70:30, by weight.

The vehicle panel of the present embodiment only needs to have at least a density equivalent to that of a fiber board conventionally used in the automobile field, and is 0.5 to 1.5 g / cm ³ , preferably 0.7 to 1.0 g. In the range of / cm ³ , it may be set as appropriate according to the place of application and expected impact characteristics.

  Moreover, the thickness dimension of the panel of this embodiment should just be equivalent to the fiber board conventionally used for the automotive field at least, and its application place and prediction are in the range of 2-20 mm, preferably 5-15 mm. What is necessary is just to set suitably according to an impact characteristic.

Depending on the vehicle panel manufacturing method, the density of the main panel portion 20 and the fragile portion 30 may be different. That is, the density of the main panel portion 20 may be larger than the density of the fragile portion 30. In such a case, the main panel portion 20 occupying most of the area of the vehicle panel is a portion that fulfills the original function as the vehicle panel, and therefore the density of the main panel portion 20 may be matched to the above conditions. . On the other hand, the density of the fragile portion 30 is smaller than that of the main panel portion 20, but the fragile portion 30 is originally a portion that should be destroyed in preference to the main panel portion 20. There is no problem. However, the density of the fragile portion 30 is desirably 0.3 g / cm ³ or more.

  As shown well in FIG. 2, the fragile portion 30 is a portion that functions as a so-called destruction allowance that should be destroyed in preference to the main panel portion 20 when an impact due to a collision or the like acts on the vehicle panel. Also functions as a shock absorber. Accordingly, it is desirable that the shape is formed in a narrow band shape in plan view, and the width dimension is set larger than the thickness dimension of the panel. This is because if the width dimension of the fragile portion 30 is narrower than the thickness dimension of the panel, the compressibility when the load is applied in the surface direction becomes small, and it is likely to be easily buckled. In the drawing, the fragile portion 30 is drawn with emphasis, and the width dimension of the fragile portion 30 is limited by the ratio of the width dimension of the fragile portion 30 to the length dimension or width dimension of the panel body 10 in the drawing. There is no.

  The portion forming the fragile portion 30 and the shape thereof are particularly limited as long as the start end and the end thereof are formed from one side end of the panel body 10 to another side end adjacent to or opposite to the panel main body 10. It can be suitably designed according to the shape of the panel body 10, the place where it is applied to the vehicle, and the desired fracture shape. For example, the panel main body 10 may be provided in a straight line shape across the lateral or longitudinal ends of the panel body 10, provided in an L shape across one corner, or in a cross shape, or may be a curved line. Of course, if the panel body 10 has a complicated shape, the shape of the fragile portion 30 will be complicated accordingly. Further, as shown in FIG. 3, the vehicle panel may overlap another vehicle panel and a part of the outer peripheral edge, and may be joined with an adhesive. It is necessary to take care not to cover the joint.

  As shown in FIG. 3, when one vehicle panel and another vehicle panel are bonded, the adhesive 40 is applied to the main panel portion 20 having sufficient breaking strength. At this time, in order to improve the adhesive strength, it is preferable to degrease and clean the vehicle panel before bonding. Although not shown, it goes without saying that the fiber board may be directly bonded to a base frame of an automobile or the like. Further, as shown in FIG. 2, the fiber boards may be overlapped with each other at the joining allowance 20 site, and the joining portion may be joined by driving in a nail or a staple. Even in this case, even if an impact such as a collision is applied to the vehicle panel, the fragile portion 30 remains preferentially destroyed over the main panel portion 20.

  Examples of the adhesive used for joining include urethane, epoxy, chloroprene, silicone, cyanoacrylate, olefin, and acrylic adhesives. In the case where the panel 10 is used as an automobile exterior material, an epoxy-based or urethane-based adhesive having relatively high adhesive strength is preferable among these. These adhesives may be applied to both sides of the film and used as a double-sided tape.

The range in which the adhesive 40 is applied is 5 to 30 mm inward from the side edge of the vehicle panel, preferably 10 to 30 mm, and more preferably 10 to 25 mm. Further, the amount of the adhesive 40 applied at that time varies slightly depending on the type of the adhesive 40 to be used, but is preferably 20 to 60 g / m ² in the dry weight of the solvent evaporated, and 20 to 30 g. / m ² is more preferable.

  Next, the manufacturing method of the vehicle panel of this embodiment is demonstrated. The panel body 10 of the present embodiment is manufactured by laminating a plurality of mats formed by mixing a fiber material or a wood piece with a binder resin. A method of manufacturing a fiber mat using wood fibers as the main composition material will be described as an example. First, fibers are collected from the wood fiber bast. As for the collection method, if it is a fiber derived from herbs, the woody material is left in the water, biodegradation (letting) that decomposes hemicellulose, which is an adhesive component, by microorganisms in the water, and is exposed to high-temperature water vapor. Fiber derived from woody materials that can be used for steaming to break down the ingredients, steaming under high-pressure conditions, releasing the pressure to atmospheric pressure at once, expanding the water that penetrates the raw material at once, and subdividing the raw material If so, it can also be obtained by dry opening using, for example, a disc refiner. Then, the obtained wood fiber is defibrated by a card machine or an air array machine to form a web, and a binder resin is mixed therewith. The wood fiber obtained by defibration is not particularly limited, but if the diameter is 16 to 22 µm, the moldability is good.

  When the fibrous binder resin is mixed, the binder resin spun by a known method such as a centrifugal method or a melt blow method may be blended with the wood fiber using a blender or the like. In the case of using a granular binder resin, there are a method of spraying or blowing air on the wood fiber web, or applying a binder resin powder adhered to a roller to the wood fiber web by electrical application. When the thermoplastic resin is mixed as a solvent solution, the solvent solution can be sprayed on the wood fiber web, or a mat that has been laminated and pressed as described later can be immersed in the solvent solution. And although it may be only the state which mixed binder resin, from now on, it forms in mat shape by a fleece, a needle punch, etc. At that time, if necessary, the fiber orientation may be aligned in a certain direction by combing. The same is basically true when inorganic fibers or wood fragments are used as the main composition material of the vehicle panel. That is, the binder resin may be mixed with the inorganic fiber or wood piece obtained by a well-known method in the above-described manner and formed into a mat shape. At this time, two types of mats are prepared: a mat 20a for the main panel portion 20 and a mat 30a for the fragile portion 30 made of a composition material having a weaker breaking strength.

  Then, after cutting the two kinds of mats having different breaking strengths obtained in this way into predetermined shapes, they are laminated at predetermined positions as shown in FIG. The panel for vehicles as an interior / exterior member for vehicles can be manufactured by binding the composition material by secondarily pressing hot. Specifically, in FIG. 4, for the main panel portion 20 at both ends of the mat 30a for the fragile portion 30 made of a composition material having a low breaking strength, in other words, a portion other than the portion where the fragile portion 30 is to be formed. The mat 20a is disposed so as to be sandwiched from above and below. In this state, primary mixing is performed to produce one mixed mat. At this time, a mixed layer in which fibers of both mats 20a and 30a are entangled with each other is formed at the bonding interface between the mat 20a and the mat 30a. And the panel for vehicles is completed by carrying out the secondary press of hot to the shape of the final product calculated | required, and hardening. Therefore, strictly speaking, in the vehicle panel according to the present embodiment, the main panel portion 20 has a three-layer structure (5 layers considering the mixed layer), and the fragile portion 30 has a single-layer structure. Accordingly, the density of the main panel portion 20 is higher than the density of the fragile portions 30.

Example 1
In the first embodiment, the fragile portion 30 is formed by partially changing the type of the binder resin in the composition material of the vehicle panel. That is, a mat 20a in which lignin and lignin were mixed for the main panel portion 20 was produced, and a mat 30a in which polypropylene (PP) was mixed for the fragile portion 30 was produced. The weight ratio of the binder resin and kenaf fiber in both mats 20a and 30a was about 70:30. Then, the mat 20a is sandwiched between the mats 30a and subjected to primary pressing at 180 ° C., which is higher than the melting point of polypropylene and lower than the curing temperature of lignin, and then temporarily molded, and then secondary at 230 ° C., which is higher than the curing temperature of lignin. Pressed to form. When the mats 30a are sandwiched between the mats 20a, the mats 20a and 20a arranged in parallel are arranged at an interval of 10 mm with the end portions of the mats 30a and the end portions of the mats 20a being aligned with a 10 mm width dimension. A fragile part 30 was formed. Further, the thickness of the mat 20a before obtaining the mixed mat was 10 mm, and the thickness of the mat 30a was 10 mm. Finally, a vehicle panel having a thickness of 10 mm was obtained.

  In the vehicle panel of the first embodiment, the binder resin of the main panel portion 20 is lignin, and the binder resin of the fragile portion 30 is polypropylene. Therefore, since the resin strength of polypropylene is lower than the resin strength of lignin, the fragile portion 30 is weaker in breaking strength than the main panel portion 20. Therefore, when an impact such as a collision acts on the vehicle panel, the fragile portion 30 is destroyed in preference to the main panel portion 20.

(Example 2)
In the second embodiment, the fragile portion 30 is formed by partially varying the type of wood fiber that is the main composition material among the composition materials of the vehicle panel. That is, a mat 20a in which lignin was mixed with ramie fiber for the main panel portion 20 was produced, and a mat 30a in which lignin was mixed with kenaf fiber was produced for the fragile portion 30. Others are the same as in the first embodiment, and a description thereof will be omitted.

  In the vehicle panel of the second embodiment, the wood fiber of the main panel portion 20 is a ramie fiber, and the wood fiber of the fragile portion 30 is a kenaf fiber. Therefore, since the fiber strength of the kenaf fiber is weaker than that of the ramie fiber, the fragile portion 30 is weaker in breaking strength than the main panel portion 20. Therefore, when an impact such as a collision acts on the vehicle panel, the fragile portion 30 is destroyed in preference to the main panel portion 20.

(Other examples)
In addition to Example 1 and Example 2, glass fiber or carbon fiber is used for the mat 20a for the main panel unit 20, and wood fiber is used for the mat 30a for the fragile unit 30. Even if a wood fiber is used for the mat 20a and a wood piece is used for the mat 30a for the fragile portion 30, the same function can be exhibited.

  In the first embodiment and the second embodiment, the end of the mat 30a and the end of the mat 20a are arranged so that the mat 20a alone layer does not exist in the surface direction. By disposing the end portion of 20a so as to protrude from the end portion of the mat 30a, it is possible to form the mat 30a so that only the mat 20a surrounds the periphery of the mat 30a.

  In the above embodiment, the portion other than the fragile portion in the surface direction is made into two layers (strictly, three layers), but it can also be obtained by forming a single mat with partially different materials and hot pressing. It is done. For example, by preparing a single fiber mat in advance and impregnating only the portion corresponding to the fragile portion with a solution containing lignin resin and impregnating the other portion with a solution containing phenol resin, the composition material is partially different. A single mat is formed. Then, you may obtain the vehicle panel in this invention by heat-pressing the obtained mat | matte at 150 degreeC or more.

  Moreover, in the said Example, although the planar vehicle panel is formed, an uneven | corrugated shape can also be given by using the press die of an uneven | corrugated plane.

It is a longitudinal cross-sectional view of the panel for vehicles. It is explanatory drawing which shows the destruction form of the panel for vehicles. It is a front view which shows the case where the panels for vehicles are adhere | attached. It is explanatory drawing which shows the manufacturing process of the panel for vehicles.

Explanation of symbols

10 Panel body 20 Main panel section 30 Weak section

Claims (6)

A vehicle panel used as an exterior member or interior member of a vehicle,
The panel according to claim 1, wherein the panel is provided with a fragile portion having a weaker breaking strength than other portions in the surface direction by partially changing the composition material thereof.   The vehicle panel according to claim 1, wherein the fragile portion is provided in an intermediate region in a surface direction of the panel in a state of being sandwiched between the other portions.   The vehicle panel according to claim 1, wherein the panel is a molded product of a fiber mat in which a fiber material and a binder resin are mixed.   The vehicle panel according to claim 3, wherein the strength of the breaking strength in the panel is provided by changing the composition of the fiber material.   The vehicle panel according to claim 3, wherein the strength of the breaking strength of the panel is provided by varying the composition of the binder resin. By mixing the fiber material and the binder resin and making the composition material partially different, the fiber mat provided with a fragile portion having a weaker fracture strength than other portions in the surface direction is hot pressed. And forming the vehicle panel into a predetermined shape.

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