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Title:
CFRP BEAM OF PLATE STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2011/064047
Kind Code:
A1
Abstract:
The present invention relates to a Carbon Fiber Reinforced Plastic (CFRP) beam of plate structure; more specifically, it relates to a CFRP beam of plate structure (20) constituting structural material used in building materials, structures, automobiles, vessels, etc. The CFRP beam of plate structure according to the present invention is constituted by a CFRP plate (11); multiple flex preventing members (21) for preventing the flexing of the CFRP plate; an aluminum plate (22) equipped on the flex preventing members; and multiple support blocks (31) for supporting the aluminum plate.

Inventors:
LEE JIN HONG (KR)
Application Number:
PCT/EP2010/065497
Publication Date:
June 03, 2011
Filing Date:
October 15, 2010
Export Citation:
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Assignee:
HEIDENHAIN GMBH DR JOHANNES (DE)
SOONHAN ENG CORP (KR)
LEE JIN HONG (KR)
International Classes:
B60J5/04; B62D29/00
Domestic Patent References:
WO2003037668A12003-05-08
WO2006091794A12006-08-31
WO2004041622A22004-05-21
WO2004043873A12004-05-27
Foreign References:
EP1302605A22003-04-16
US20020053179A12002-05-09
Other References:
None
Attorney, Agent or Firm:
DR. JOHANNES HEIDENHAIN GMBH (Traunreut, DE)
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Claims:
Claims

1 . CFRP beam of plate structure, characterized by being constituted of CFRP plates (1 1 ); multiple flex preventing members (21 ) for preventing the flexing of the CFRP plate (1 1 ); an aluminum plate (22); and multiple support blocks (31 ) for supporting the aluminum plate (22). 2. CFRP beam of plate structure of claim 1 , characterized by being constituted of two elongated CFRP plates (1 1 ) facing each other, the flex preventing members (21 ), the aluminum plate (22), and the support blocks (31 ) being arranged between the CFRP plates (1 1 ), defining a distance between the CFRP plates (1 1 ) and thereby a width of the CFRP beam of plate structure (20).

3. CFRP beam of plate structure of claim 1 , characterized by the aluminum plate (22) being fixed to the support blocks (31 ).

4. CFRP beam of plate structure of claim 3, characterized by the support blocks (31 ) being fixed to the CFRP plates (1 1 ). 5. CFRP beam of plate structure of claim 1 , characterized by the flex preventing members (21 ) being fixed to the CFRP plates (1 1 ).

6. CFRP beam of plate structure of Claim 1 , wherein the flex preventing members (21 ) are arranged so that they mutually alternate with each other on the upper and lower side of the aluminum plate (22). 7. CFRP beam of plate structure of Claim 1 , wherein the flex preventing members (21 ) extend in the width direction.

Description:
CFRP beam of plate structure

The present invention relates to a Carbon Fiber Reinforced Plastic (abbreviated as "CFRP below) beam of plate structure; more specifically, it relates to a CFRP beam of plate structure constituting structural material used in building materials, structures, automobiles, vessels, etc. Generally speaking, a CFRP beam of plate structure is used in public works, structures and automobiles, vessels, etc.

Moreover, as depicted in Drawings 1 and 2, a CFRP beam with a square pipe form is primarily used as the traditional CFRP beam.

Herein, as described above, CFRP constitutes various composites of carbon fibers and heat-hardened plastics as carbon fiber reinforced plastic.

Such CFRP have the following characteristics.

First, it has a high strength to weight ratio, and is light and strong. The carbon fiber has the same level of tension as high tension steel in the fiber direction, has a higher rate of elasticity than titanium, and is an ultralight material with a specific gravity that is 60% of that of aluminum.

Second, contraction and expansion hardly occurs at all, and the degree of measuring precision is extremely high. With CFRP, the calculation of heat expansion in the fiber direction is almost the same as 0, and there is small shrinkage at high temperatures. Therefore, when laminated by a lamination method, CFRP with a heat expansion calculation of 0 may be obtained. Third, shock absorbency is good, and it is highly effective in earthquakes. Due to the combined action of the plastic and fiber, CFRP is highly shock absorbent and it has a high attenuation rate.

Consequently, because of such characteristics, CFRP is used as structural material.

Drawing 1 is a perspective view of the traditional square pipe-shaped CFRP beam; Drawing 2 is an expanded view of one portion of Drawing 1 .

In referring to Drawings 1 and 2, the traditional square pipe-shaped CFRP beam is constituted of CFRP plate 1 1 , square internal mold 12 and mold support member 13.

Herein, if the size of such traditional square pipe-shaped CFRP beam is modified, the internal mold must be newly manufactured, the size modification is difficult to conduct, the manufacturing period requires a long period of time, and expensive manufacturing costs are incurred, which are problematic.

In addition, such traditional square pipe-shaped CFRP beam is incapable of serving as a countermeasure to increased external load conditions, which is problematic.

Accordingly, the invention has been produced for the purpose of solving these problems; its purpose is to provide a CFRP beam of plate structure with a high degree of precision and high level of strength applied to a project cross axis of 10G or greater.

The CFRP beam of plate structure according to the present invention is constituted by a CFRP plate; multiple flex preventing members for preventing the flexing of the CFRP plate; an aluminum plate equipped on the flex preventing members; and multiple support blocks for supporting the aluminum plate. Additionally, the invention is characterized wherein the flex preventing members are arranged so that they mutually alternate with each other on the upper and lower surface of the aluminum plate.

Moreover, the invention is characterized wherein the flex preventing members may extend in the width direction.

Further, the invention is characterized wherein the flex preventing members are located at close intervals, so that it may serve as a countermeasure to external pressure conditions.

As described above, The CFRP beam of plate structure according to the present invention is able to obtain the following effects.

First, due to the built-up type plate structure, the manufacturing period is reduced so that manufacturing costs may be reduced, which is beneficial.

Second, manufacturing is easily accomplished due to the CFRP plate, which is beneficial. Third, manufacturing of the mold is simple, and it possible to use an ordinary material when the mold is manufactured, which is beneficial.

Fourth, modifications aside from the size in the lengthwise direction to include the size in the width direction may also freely be made, which is beneficial. Fifth, countermeasures to external load conditions are possible due to reinforcing of the mold, which is beneficial. Sixth, processing costs may be reduced due to minimizing of the processing surface of the CFRP plate.

Below, The CFRP beam of plate structure according to the present invention are described in greater detail through referencing drawings. Drawing 1 is a perspective view of the structural members of the traditional CFRP material.

Drawing 2 is an expanded view of one portion of Drawing 1 .

Drawing 3 is a perspective view of the CFRP beam of plate structure according to the present invention. Drawing 4 is an exploded perspective view of the CFRP beam of plate structure according to the present invention.

In explaining the present invention, where specific explanations of related publicly available art or compositions are judged to possibly render the substance of the present invention as unnecessary, the detailed explanation of such is omitted. Further, the terms that are referenced herein have been defined in consideration of the functions of the present invention; consequently, they may differ depending on purposes of the client, operator or user. Consequently, the definitions must be based on the general details involving the present invention. The reference nu mbers used in all of the d rawings denote the same structural elements.

Drawing 3 is a perspective view of the CFRP beam of plate structure according to the present invention; Drawing 4 is an exploded perspective view of the CFRP beam of plate structure according to the present invention. In referring to Drawings 3 through 4, CFRP beam 20 of plate structure according to the present invention is constituted by two CFRP plates 1 1 ; multiple flex preventing members 21 for preventing the flexing of the CFRP plates 1 1 ; an aluminum plate 22; and multiple support blocks 31 for supporting the aluminum plate 22.

Herein, the flex preventing members 21 are arranged so that they mutually alternate with each other on the upper and lower side of the aluminum plate 22, so that the invention may serve as an effective countermeasure to external load applied to the CFRP plate 1 1. The results of measuring such volume of change due to changes to the temperature of the CFRP beam 20 of plate structure according to the present invention are depicted in Table 1 below.

Table 1 : Volume of change due to changes to the temperature With respect to the conditions used in measurement in Table 1 , the initial temperature was 22°C, and the volume of changes in length due to changes to the temperature from 20°C to 100°C were measured in the X, Y and Z directions; a height gauge and vernier caliper were used as the measuring instruments. In referring to Table 1 , as the measured results indicate, changes occurred due to the differences in temperature; results were exhibited in which the volume of error increased as the temperature increased.

Aluminum showed an average increased volume of 0.02mm per 10°C, while CFRP exhibited a volume of change that was 1/3 that of the aluminum. In addition, when set to the initially measured temperature, the volume of change exhibited the value measured at the time that the temperature was initially measured.

As compared with the traditional square pipe form CFRP beam 10, the left and right sides of CFRP beam 20 of plate structure according to the present invention are formed as CFRP plate 1 1 , so that the manufacturing unit cost may be reduced and the manufacturing period reduced as compared with the traditional square pipe form CFRP beam 10.

Furthermore, it is possible for the CFRP beam 20 of plate structure according to the present invention to be extended, the same as with the traditional square pipe form CFRP beam 10; because the internal mold is unnecessary with the present invention, it may be extended in the width direction, which is not possible with traditional square pipe form CFRP beam 10. For example, if only the length of the flex preventing members 21 equipped on aluminum plate 22 is extended, CFRP beam 20 of plate structure may be extended as far as desired in the width direction.

Moreover, through increasing the number of the flex preventing members 21 simply equipped on aluminum plate 22, the invention may serve as a countermeasure to external pressure conditions. Herein, it is possible for flex preventing members 21 for preventing the flexing of the CFRP plate 1 1 , aluminum plate and multiple support blocks 31 to use general steel material or high-strength steel material.

With the CFRP beam of plate structure according to the present invention, an internal mold is rendered unnecessary, the manufacturing of a mold for external temperature and high pressure use is simple, the manufacturing period is reduced and weight decreased, size changes and processing in the lengthwise and width directions are easily conducted, and large-volume lamination transport is possible. In this manner, although the CFRP beam of plate structure according to the present invention is lightweight in comparison with the traditional square pipe form CFRP beam, it is superior in terms of strength.

Additionally, because the length from existing pressure eliminates the restricting factors, it may be applied to semiconductor systems from the 10th generation and beyond.

Further, due to the design of the plate structure, the invention may serve as an immediate countermeasure for various system designs.

Moreover, the plate structure with which a mold is unnecessary may serve as a countermeasure for gradually developing supply chain management market conditions.

The CFRP beam of the plate structure according to the present invention may be applied to systems requiring Stoke of 2500mm or greater, systems with high speed and high acceleration conditions, systems requiring a high level of precision within a small area, and systems requiring high pay load conditions. The invention as described above has been explained based on fine working examples, but these working examples are not intended to restrict the present invention but are rather used for the purpose of illustration; consequently, it is possible for a person skilled in the art of the present invention to apply a variety of changes, modifications or adjustments to the above working examples without deviating from the art of the present invention. Therefore, the protective scope of the present invention must be interpreted to comprise all examples of changes, modifications or adjustments contained within the substance of the art of the present invention.