JP6232783B2 - Reinforcing method for vehicle door not provided with reinforcement and vehicle door not provided with reinforcement - Google Patents

Description

The present invention relates to a vehicle door which is not provided with a reinforcement method and reinforcement of a vehicle door having no reinforcement, more particularly with respect to exterior materials of a vehicle door having no reinforcement The present invention relates to a reinforcing method for imparting impact resistance, rigidity, vibration proofing, and the like, and a vehicle door.

  An exterior material used for an upper structure such as a vehicle body or a door is three-dimensionally formed by pressing a thin steel plate and has rigidity by itself. And in order to protect a passenger | crew with respect to the impact from the side surface of a vehicle, the metal reinforcement member is provided along the inner side of an exterior material. As this reinforcing member, an impact bar and a reinforcement are attached.

  For example, as shown in Patent Document 1, a vehicle door structure in which an impact bar and a reinforcement are provided at the height of a bumper inside an outer panel of a door is disclosed. Thereby, in the event of a collision with another vehicle, the outer panel can be prevented from being greatly recessed inward by the impact bar and the reinforcement, and the occupant can be protected. In addition to the door, a reinforcing member may be provided on the inner side of the exterior material on the side or ceiling of the body corresponding to the seat of the occupant to enhance the impact resistance of the exterior material. Further, Patent Document 2 discloses a vehicle side impact absorbing structure in which an impact absorbing member is attached along an inner surface of an outer panel of a door having a plurality of impact bars. Examples of the impact absorbing member include a low impact urethane, a rib reinforcement of a trim, a honeycomb structure, a cylindrical impact absorbing material formed of a metal foil, paper, a resin sheet, or the like.

  In recent years, steel sheets used for the superstructure of automobiles have been used to reduce the weight of the car body by using thin steel sheets with a thickness of 0.6 to 0.8 mm, and using high-tensile steel sheets to reduce the thickness and weight. Therefore, on average, the weight reduction of 100 kg reduces the fuel consumption by about 1 km / liter, and the exhaust gas can also be reduced. However, even if the vehicle exterior material is made thinner, it is necessary to use a highly rigid metal reinforcing member in order to ensure impact resistance, even if the weight can be reduced by that much. It was a hindrance.

  Patent Document 3 discloses a reinforcing sheet that is attached to the inside of an automobile body steel plate to reinforce rigidity. This reinforcing sheet is obtained by laminating a constraining layer on an unvulcanized sheet, and is a method in which an uncured sheet side is laminated and pasted so that the unvulcanized sheet side is in contact with an automobile body steel plate and then passed through an oven in an automobile production line By being heated and fired by this, and cured by cross-linking, it is firmly bonded to the steel sheet to form a laminate. However, the reinforcing sheet needs to be preliminarily cut into a predetermined complicated shape, and the workability is very poor, and since it is a rubber material, the reinforcing effect is not sufficient.

  Polyurea resin, on the other hand, has a fast curing time, durability, waterproofness, chemical resistance, and elongation of 280% or more, so it is used for waterproofing by spraying on concrete surfaces in civil engineering and construction fields. Yes. For example, it is formed on the inner surface of a floor surface of a rooftop parking lot, a tunnel, an underground tank, a swimming pool, a waterway, and the like. In addition, since it has a high anti-rust effect, it has been used on ships.

JP 2010-137754 A JP 2009-173140 A JP 2001-038842 A

Accordingly, the present invention is in view of the circumstances described above, it is an attempt to solve, for the exterior material of a vehicle door having no reinforcement, impact resistance, stiffness, to impart vibration damping property and the like as well as a possible, it is to provide an light weight, vehicle door which is not provided with a reinforcement method and reinforcement of a vehicle door having no reinforcement that can reduce the cost as a whole.

In order to solve the above-mentioned problems, the present invention provides a vehicle door provided with an impact bar on the lower side of the inner surface of an exterior material made of a steel plate having a thickness of 0.6 to 0.8 mm and not provided with a reinforcement on the upper side. A reinforcing method of
On the inner surface of the exterior material, an isocyanate supplied from an independent raw material supply hose and a polyamine having an amino group as a curing agent are applied with a collision mixing spray gun to form a polyurea resin reinforcement layer along the inner surface. and, the polyurea resin is strain (elongation) of 2% when the tensile stress is above 10 MPa, the breaking stress Ri der least 20 MPa,
The vehicle door is placed horizontally with the outer surface of the exterior material facing upward and supporting both sides, and an 11 kg weight consisting of a concrete block whose surface is covered with polyurea resin is placed at a height of 2 m. the drop impact test by dropping from a, to constitute a reinforcing method of a vehicle door having no reinforcement, characterized in that to obtain the results overall dent is not (claim 1).

Further, the present invention is that the impact bar to the underside of the inner surface of the outer package made of steel plate having a thickness of 0.6~0.8mm provided a vehicle door having no reinforcement to the upper,
Along the inner surface of the outer member, the strain (elongation) of 2% when the tensile stress is above 10 MPa, the reinforcing layer of the polyurea resin breaking stress is more than 20MPa provided,
The vehicle door is placed horizontally with the outer surface of the exterior material facing upward and supporting both sides, and an 11 kg weight consisting of a concrete block whose surface is covered with polyurea resin is placed at a height of 2 m. A vehicle door without a reinforcement, which is characterized by obtaining a result having no overall dent by a drop impact test for dropping, is constructed (claim 2).

Reinforcing method of a vehicle door having no reinforcement of the present invention obtained by the above, the impact bar provided below the inner surface of the outer package made of steel plate having a thickness of 0.6 to 0.8 mm, the upper side A method for reinforcing a vehicle door that does not include reinforcement, and is a collision-mixing spray of isocyanate supplied from an independent raw material supply hose and a polyamine having an amino group as a curing agent on the inner surface of the exterior material. was applied by gun, to form a reinforcing layer of polyurea resin along the inner surface, the polyurea resin is strain (elongation) of 2% when the tensile stress is above 10 MPa, the breaking stress Ri der than 20 MPa, the vehicle The door is placed horizontally with the outer surface of the exterior material facing upward and supporting both sides, and a concrete block whose surface is covered with polyurea resin at the center. The drop impact test for dropping a weight of 11kg consisting click from a height of 2m, therefore obtain results overall dent is not, an impact applied from the outside of the opposite side of the formed internal surface a reinforcing layer, impact Tensile stress acts on the reinforcement layer of polyurea resin in the area where the force acts, and compressive stress acts on the outer periphery, but polyurea resin has an extremely high initial modulus of elasticity, so that deformation of the exterior material is made elastic. It can prevent and absorb impact force, and is very excellent in impact resistance.

  Polyurea resin is produced by urea bonding of isocyanate and amino group-containing curing agent, but the reaction is very fast and can be contact-cured in a few seconds, so the subsequent process can be performed immediately and produced. Efficiency is improved. In addition, the polyurea resin has a stronger binding force than the polyurethane resin and does not hydrolyze, so it has excellent water resistance, corrosion resistance, and chemical resistance.

Vehicle door having no reinforcement of the present invention, the impact bar provided below the inner surface of the outer package made of steel plate having a thickness of 0.6 to 0.8 mm, does not have a reinforcement in the upper A vehicular door provided with a polyurea resin reinforcing layer having a tensile stress of 10 MPa or more and a breaking stress of 20 MPa or more when the strain (elongation) is 2% along the inner surface of the exterior material. The outer surface of the exterior material is horizontally supported with both sides facing upward, and an 11 kg weight consisting of a concrete block whose surface is covered with polyurea resin is dropped from a height of 2 m at the center. the drop impact test, since obtaining the overall dent is not a result, it is possible to reduce the weight without deteriorating the impact resistance as a whole, in particular, provided on the lower side of the inner surface of the outer member Is provided with the reinforcing layer of the polyurea resin in combination with Npakutoba, it can be enhanced further impact resistance than those of the conventional structure. In addition, by forming a polyurea resin reinforcement layer over a large area of the exterior material, vibration and sound insulation can be improved, and rigidity and impact resistance at locations where there are no metal reinforcement members have been added. Can be granted.

It is a side view of the commercial door of the state which removed the interior member. It is a side view of the door of the state which similarly removed one metal reinforcement member. FIG. 3 is a side view of the door in a state where a polyurea resin reinforcing layer is formed on the inner surface of the exterior material of FIG. 2. It is a fragmentary sectional view which shows the laminated structure of an exterior material and the reinforcement layer of a polyurea resin. It is a strain-stress diagram of various grades of polyurea resin and urethane resin. FIG. 6 is an enlarged view of a region with a small strain in FIG. 5. It is a graph of the storage elastic modulus and tan-delta of polyurea resin and urethane resin of various grades.

  Next, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings. 1 to 4 show an embodiment in which a polyurea resin reinforcing layer is provided on the inner surface of a door exterior material, and FIGS. 5 to 7 show the characteristics of various grades of polyurea resin in comparison with urethane resin. .

  As a vehicle exterior material to be used in the present invention, an upper structure to be attached to a carriage frame made of a steel plate having a thickness of 0.6 to 0.8 mm, specifically a body (including a side plate, a roof, and a floor plate), Examples include doors, hoods, trunk lids, bumpers, and the like, and they are basically made of a thin metal material such as a rigid load carrier material or container attached to a vehicle. Furthermore, the exterior material of a vehicle may be comprised with a carbon fiber reinforced resin.

  Inside the exterior material of the vehicle, a metal reinforcing member for improving impact resistance is disposed at a proper position. These reinforcing members include a door impact bar, a front bumper beam, a rear bumper beam, a cross member, a front pillar reinforcement, a center pillar reinforcement, and a side sill.

  The polyurea resin used in the present invention comprises an isocyanate and a curing agent having an amino group, and particularly uses a polyamine as the curing agent. A polyurea resin is cured by a reaction in which a urea bond is formed by mixing an isocyanate and a curing agent having an amino group. Since the urea bond formation reaction is very fast, such as several seconds, it is difficult to perform normal molding using a molding die. Therefore, a coating film is formed on the surface of the substrate by a method in which an isocyanate supplied from an independent raw material supply hose and a curing agent having an amino group are applied by a collision mixing spray gun.

  The characteristics of general polyurea resins are that they cure quickly and are not easily affected by moisture and moisture in the air, that they can cure quickly and form a good coating film even at low temperatures, and that they have excellent chemical resistance. It is excellent in the adhesiveness with respect to the material surface, and has an elongation of 280% or more, and can sufficiently follow the cracks and maintain the adhesion.

  There are several grades of polyurea resin, each having different characteristics. Therefore, it is necessary to select and use an optimum grade for reinforcement of a vehicle exterior material. The polyurea resin used in the present embodiment is preferably a resin having high initial elastic modulus and elastic limit stress, large elongation, and high yield strength as tensile properties. Specifically, a polyurea resin manufactured by LINE-X, trade name: PAXCON XS-350 was used.

  FIG. 1 is a side view of a commercially available door 1 of an automobile viewed from the inside with an interior member removed. The exterior material 2 of the door 1 is also called an outer panel, and metal reinforcement members 3 and 4 are attached to the inner side of the door 1 on both sides to give impact resistance from the outside. The upper reinforcing member 3 may be called a reinforcement, and the lower reinforcing member 4 may be called an impact bar. Two same doors 1 were prepared for the experiment, and the upper reinforcing member 3 was removed from one door 1 as shown in FIG. Then, as shown in FIG. 3, a polyurea resin was applied over the entire inner surface of the exterior member 2 of the door 1 from which the reinforcing member 3 had been removed to provide a reinforcing layer 5 having a predetermined thickness. FIG. 4 is a partial cross-sectional view showing a simple structure in which the steel plate of the exterior material 2 and the polyurea resin of the reinforcing layer 5 are laminated.

  In order to form the polyurea resin reinforcing layer 5 on the inner surface of the vehicle exterior material 2, an isocyanate supplied from an independent raw material supply hose (not shown), a curing agent having an amino group (polyamine), and Is applied with an impact mixing spray gun (not shown). Immediately upon application, the isocyanate and polyamine form a urea bond and cure.

  In order to confirm the effect of the present invention, a drop impact test was performed. The door in the original state (original door) in FIG. 1 and the door (polyurea resin reinforced door) formed by removing the upper reinforcing member 3 in FIG. The outer surface is faced upwards, and both sides are supported by a resin pallet and left to stand horizontally. And the 11 kg weight which covered the surface of the concrete block with the polyurea resin in order to prevent the fracture | rupture at the time of a drop impact was prepared, and it was dropped from the height of 2 m to the center part of the said door. These drop impact tests were videotaped and analyzed.

  As a result, at the moment when the concrete block collided with the original door, the exterior material 2 was recessed by about 140 mm, and after that, it was slightly restored, but an overall recess of about 80 mm remained. On the other hand, in the case of the polyurea resin reinforced door, the exterior material 2 was recessed about 30 mm at the moment when the concrete block collided, but then it was completely restored to its original shape and there was no overall dent, and the block hit the part. Only a recess of about 0.3 mm remained.

  Next, the product of LINE-X used in the present embodiment, product name: PAXCON XS-350 and other grades (PX-100, PX-2100, SE-500) and the result of comparing the characteristics of the urethane resin with reference. Is shown in FIGS.

  The storage elastic modulus E ′ is the real part of the complex elastic modulus measured in the tensile test mode, and represents the hardness of the sample. Tan δ is a loss tangent, and a peak occurs at a temperature at which molecular motion begins, and this temperature corresponds to the glass transition temperature.

<1. Tensile test>
It can be seen that the polyurea resin: XS-350 has a high elastic deformation limit stress (yield strength), and has a tensile stress of 10 MPa or more and a breaking stress of 20 MPa or more when the strain (elongation) is 2%. Other grades of polyurea resin are not very expensive (SE-500 is unknown). The urethane resin has a small elastic deformation limit stress, but has a breaking stress exceeding 30 MPa, and the elongation at that time is as large as about 380%. That is, the urethane resin has a large distortion even under a small stress, and is soft and rubbery. Polyurea resins: PX-100 and PX-2100 show almost the same behavior. XS-350 exhibits excellent impact resistance, particularly due to its high stress limit and strain (elongation).

<2. Viscoelasticity test>
Polyurea resin: PX-100 and PX-2100 behave substantially the same as in the tensile test. Two tan δ peaks are observed around 80 ° C and around 190 ° C. Moreover, a shoulder is seen at around -15 ° C. Polyurea resin: XS-350 has small and broad peaks at around −15 ° C. and around 80 ° C., and a large peak at 200 ° C. or more. Polyurea resin: SE-500 has a large peak in the vicinity of 160 ° C. and a very small peak in the vicinity of −40 ° C. In contrast, urethane resin has a large peak at a slightly lower temperature than 10 ° C.

  From the above, the polyurea resin: PX-100 and PX-2100 are composed of two types of segments that are relatively soft and have a low transition point, and the polyurea resin: XS-350 includes the above-mentioned segments. , The amount is very small, and it can be inferred that a segment that is harder than these and has a high transition point exists as a main component. In addition, it can be inferred that polyurea resin: SE-500 is composed of a rigid structure and a segment having a lower transition point than a small amount of PX-100 and PX-2100.

  From the above, it can be understood that the polyurea resin has better impact resistance than the urethane resin, and XS-350 has the most excellent impact resistance among a plurality of polyurea resin grades.

1 door,
2 exterior materials,
3 Reinforcing members,
4 Reinforcing members,
5 Reinforcing layer of polyurea resin.

Claims (2)

A method for reinforcing a vehicle door that is provided with an impact bar on the lower side of an inner surface of an exterior material made of a steel plate having a thickness of 0.6 to 0.8 mm, and does not include a reinforcement on the upper side,
On the inner surface of the exterior material, an isocyanate supplied from an independent raw material supply hose and a polyamine having an amino group as a curing agent are applied with a collision mixing spray gun to form a polyurea resin reinforcement layer along the inner surface. and, the polyurea resin is strain (elongation) of 2% when the tensile stress is above 10 MPa, the breaking stress Ri der least 20 MPa,
The vehicle door is placed horizontally with the outer surface of the exterior material facing upward and supporting both sides, and an 11 kg weight consisting of a concrete block whose surface is covered with polyurea resin is placed at a height of 2 m. A method for reinforcing a vehicle door without a reinforcement, characterized in that a drop impact test is performed to obtain a result having no overall dent . The thickness of the impact bar to the underside of the inner surface of the outer package made of steel 0.6~0.8mm provided a vehicle door having no reinforcement to the upper,
Along the inner surface of the outer member, the strain (elongation) of 2% when the tensile stress is above 10 MPa, the reinforcing layer of the polyurea resin breaking stress is more than 20MPa provided,
The vehicle door is placed horizontally with the outer surface of the exterior material facing upward and supporting both sides, and an 11 kg weight consisting of a concrete block whose surface is covered with polyurea resin is placed at a height of 2 m. A vehicle door without a reinforcement, characterized in that a drop impact test is performed to obtain a result without an overall dent .

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