JP2680277B2 - Manufacturing method of structural member for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a structural member for a vehicle such as a floor material for a truck, a bolster, a tilt and a floor board for a bus.

[0002]

2. Description of the Related Art Vehicle structural members such as those described above have been manufactured from wood with high strength such as APITON in the past, but recently, in response to the problem of depletion of forest resources and the demand for vehicle weight reduction, composite The use of wood has been studied and put to practical use. For example, Japanese Utility Model Application No. 3-107285
The publication discloses a truck bolster in which a laminated layer of hard wood is adhered to both left and right sides of a central layer made of soft wood. When manufacturing such a structural member for vehicles, conventionally, a laminated material in which hard wood veneers are applied with an adhesive between them and laminated in the cross direction is arranged on both left and right side surfaces of a core material made of soft wood. However, the method of simultaneously press-molding the whole has been taken. The pressure applied at this time must be relatively low so that soft wood is not crushed.
The pressure was 10 kg / cm ² or less.

However, due to the increase in size of trucks and buses, regulation of overloading, regulation of exhaust gas, etc., structural members for vehicles such as floorboards and bolsters are required to be lighter and have high rigidity and impact resistance. The conventional simultaneous molding method has reached its limit despite various efforts such as various types of adhesives and adhesives.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a method capable of manufacturing a structural member for a vehicle, which has greater rigidity and impact resistance than conventional products. It was made.

[0005]

A method for manufacturing a structural member for a vehicle according to the present invention for solving the above-mentioned problems is provided by Apiton,
Adhesive is applied between the veneers of either Kruin or Kapole and laminated in the cross direction, and then pressure-molded at a high pressure of 15 to 25 kg / cm ² , and the obtained laminated material is a softwood or MDF.
It is characterized in that pressure bonding at 10 kg / cm ² or less of pressure on both sides of the more becomes the core material.

[0006]

According to the present invention, a much higher pressure than before is applied.
As a single plate of hard wood such as Apiton, Kruyne, and Kapole is pressure-molded at 15 to 25 kg / cm ² , as shown in the examples described later, the bending Young's modulus that directly affects the rigidity and impact resistance is It can be increased significantly. Such high specific gravity hard wood such as Apiton, Quruin, Capo
The laminated material with high-pressure adhesive is strong and has high impact resistance. Moreover, it is lightweight because it can be made as thin as about 1 mm. Furthermore, since it is impregnated with a resin inside and it is half plasticized, it has a high breaking strength and is useful for preventing the contact between the bolster and the floor plate from being scratched, and also preventing the floor surface from being worn and scratched. In addition, this laminated material is used as a softwood material or MDF.
10 kg / cm ² as before when bonded to a core material consisting of
Since pressure bonding is performed under the following pressure, the structure of the lightweight core material is not destroyed, and the vehicle structural member that is lightweight and has a bending fracture strength higher than conventional products can be obtained. Hereinafter, the present invention will be described in more detail with reference to Examples.

[0007]

EXAMPLES Example 1-Truck Bolster First, a sliced veneer of the South Sea Dipterocarpaceae Apiton (thickness 0.5 mm) is laminated in three plies by alternately crossing the grain directions. At this time, an adhesive prepared by mixing 100 parts of a phenolic adhesive with 15 parts of an extender at a rate of 250 g / m ² was applied to both sides of the central sliced veneer at a rate of 22 kg / cm ² . Pressure molding with pressure. The temperature at this time is 135 to 140 ° C., and the pressurizing time is about 1 minute. The Apiton laminated material having a total thickness of about 1 mm obtained in this manner is cut to a required size, and one surface is roughened by sanding. The grain direction of the outer veneer is set to match the longitudinal direction of the bolster.

On the other hand, three softwood softwood lumbers of Yonematsu (38 × 42 × 2070 mm) are bonded by a cold press machine to obtain a soft wood laminated material as a core material. The pressure applied at this time was 10 kg / cm ² , the pressing time was about 20 minutes, and the amount of adhesive applied was 250 g / m ² .

Next, 200 g / m ^{2 of} an adhesive prepared by mixing 100 parts of a phenol-based adhesive with 15 parts of a filler was added to one surface of the above-mentioned laminated material.
And apply it to both the left and right sides of the core material. Then, a hot press machine is used for pressure bonding at a pressure of 8 to 10 kg / cm ² . At this time, the temperature is 135 to 140 ° C. and the pressurizing time is about 1 minute. As a result, needles as shown in FIG. 1
Apiton the left and right side surfaces of the core member 1 made of wood material, crazy
As a result, a bolster to which the hard wood laminated material 2 of either one of the two is bonded is obtained.

When this bolster was set in a testing machine and a strength test was conducted, the bending fracture strength was 626 kg / cm on average.
^{It was 2} and showed almost the same strength as a bolster of the same size composed entirely of a single material of hard and high specific gravity APITON. Moreover, the bending Young's modulus of the bolster obtained by the method of the present invention is 101 kg / cm ² on average, which is inferior to 117 kg / cm ² which is the average value of the bending Young's modulus of the single material of Apiton, but the simultaneous pressing of the conventional method. The bolster produced by the molding method showed a high value about 3 times as large as the average value of the bending Young's modulus of 31 kg / cm ² . Since the bolster obtained by the method of the present invention can reduce the weight by about 20% compared to the bolster of the same size made of a single material of Apiton, its superiority in fuel efficiency improvement is clear. .

Next, when the pressurizing force at the time of pressure molding of the Apiton veneer was changed from 8 kg / cm ² to 30 kg / cm ² , the influence on the bending fracture strength and bending Young's modulus of the bolster was examined. pressure excellent results as described above in the range of 15 to 25 kg / cm ² was obtained, in particular pressure most favorable results were obtained in the vicinity of 20 kg / cm ^2. However, when the applied pressure is less than this range, both the bending fracture strength and the bending Young's modulus are lowered, and the bending Young's modulus is particularly lowered.
On the contrary, when the applied pressure exceeded 25 kg / cm ² , the Young's modulus of bending gradually decreased and it tended to snap at a certain moment. It is presumed that this is because the structure of the APITON veneer was destroyed due to the excessively high pressure, and the plasticization inside proceeded.

Example 2-Bath Floor Plate Apiton sliced veneer (thickness 0.5 m) as in Example 1.
m) are laminated by alternately crossing the grain direction, coated with a phenolic adhesive on both sides, press-molded with a hot press machine at a pressure of 20 kg / cm ² , and the product of Apiton <br /> A layer board 2 was obtained. As shown in FIG. 2, this was pressure-bonded to the upper and lower surfaces of a flat core material 1 made of MDF (Middle Density Fiber Board) at a pressure of 10 kg / cm ² . Like the first embodiment, this floor plate for a bus is light in weight, has a large bending fracture strength and a large bending Young's modulus, and is also excellent in soundproofing. Therefore, it is suitable for blocking engine noise from under the floor. Further, if the LM type is used for the MDF, it has a high antiseptic property and can prevent the corrosion of the floorboard.

[Example 3—Floorboard for trucks] Instead of the MDF of Example 2, a core material obtained by laminating 5-ply cross laminated rotary veneers of Yonematsu with a thickness of 2.4 mm was used.
Other conditions were the same as in Example 2 to manufacture a truck floorboard. Pressure from 8kg / cm ² to 30 for pressure molding of laminated materials
The results obtained by measuring the flexural fracture strength and the flexural Young's modulus of the floorboard while changing to kg / cm ² are as shown in Table 1 below. It should be noted that this floor plate can be used as a floor plate for a bath and has high antiseptic properties as in Example 2.

[0014]

[Table 1]

According to the present invention, as shown in Table 1, 15 to 25 kg
At high pressure of / cm ² , either Apiton, Quruin, or Kapole
The floor plate for a truck using a laminated plate obtained by pressure-molding the above single plate is advantageous in that it has a high bending Young's modulus that directly affects rigidity and impact resistance. In the case of simultaneous molding as before, the Young's modulus of bending is 31 kg / cm ² when the pressure is 8 kg / cm ² , and the Young's modulus of bending is 49 kg / cm ² when the pressure is 15 kg / cm ^2. And the difference from the conventional method is clear.

In each of the above-mentioned embodiments, Apiton was used as the hard wood, but it is also possible to use cruin or capol of the South Sea dipterocarp family. Further, in Examples 1 and 3 , the core material was composed of a softwood material such as rice pine, but it is also possible to use pine species of coniferous trees such as Japanese pine, Kara pine, Chile and New Zealand radiator pine.

[0017]

As described above, according to the method for manufacturing a structural member for a vehicle of the present invention, the structural member for a vehicle is much lighter than the conventional structural member for a vehicle made of a single material of APITON and has a high rigidity. Further, there is an advantage that it is possible to manufacture structural members for vehicles such as truck floor materials, bolsters, tilts, and bus floor boards, which are comparable to impact resistance.

The laminated material obtained by this manufacturing method is semi-plasticized, is resistant to abrasion and scratches, and prevents water from being poured from below. The nail head is not cut and the nail holding power is maintained. Also, when used for bolsters, floorboards and tilting materials, it has high antiseptic properties and does not easily rot. In this way, the conventional kine-in body material and the kine-in plywood-track body material have the same functions, and the drawbacks thereof are overcome . Therefore, the present invention has a high industrial value as a method for manufacturing a structural member for a vehicle that solves the conventional problems.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bolster manufactured by the method of Example 1.

FIG. 2 is a perspective view of a bath flooring material manufactured by the method of Example 2.

[Explanation of symbols]

 1 Core material 2 Hard wood laminated material

Claims (1)

(57) [Claims] 1. An APITON, a KURUIN, or a CAPOL
Both sides of the single plate by applying an adhesive between each other and pressure-molded at a high pressure of 15 to 25 kg / cm ² after having laminated the cross direction, the core made of softwood or MDF laminated material obtained material 10 on the surface
A method for manufacturing a structural member for a vehicle, which comprises press-bonding with a pressure of kg / cm ² or less.