JP3976429B2 - Method for preventing resonance vibration of thick steel plate forming hollow part - Google Patents
Method for preventing resonance vibration of thick steel plate forming hollow part Download PDFInfo
- Publication number
- JP3976429B2 JP3976429B2 JP34875298A JP34875298A JP3976429B2 JP 3976429 B2 JP3976429 B2 JP 3976429B2 JP 34875298 A JP34875298 A JP 34875298A JP 34875298 A JP34875298 A JP 34875298A JP 3976429 B2 JP3976429 B2 JP 3976429B2
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- JP
- Japan
- Prior art keywords
- steel plate
- thick steel
- hollow portion
- thickness
- resonance vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【０００１】
【発明の属する技術分野】
本発明は、中空部を形成する鋼板の制振方法に関する。
【０００２】
【従来の技術】
強度、加工性、意匠性等に優れるため、あらゆる場面に使用されている鋼板であるが、反面、重い、錆び易い、振動を伝え易い、熱を伝え易い等の物理的な欠点もある。このため薄板にすることでの軽量化、防錆剤を挟み込むことによる防錆鋼板化、粘弾性物質を挟み込むことによる制振鋼板化など、様々な改良が加えられて実用化している。
【０００３】
特に、自動車などの輸送機械においては、鋼板の軽量化を要求される分野であり、昨今の自動車用鋼板は板厚が０．８ｍｍ程度であり、強度を確保するためにビード形状としたり、防錆化、制振化された鋼板が開発され、また粘弾性物質による制振材の使用も一般的に行われている。
【０００４】
しかしながら、土木・建築・構築物や工業用プラント、作業・建設用機械等に使用される鋼板は、大きな強度や剛性が要求されるため、板厚が２ｍｍ以上の厚物鋼板であることがほとんどである。
【０００５】
０．８ｍｍ程度の板厚の鋼板に対して制振効果を有する制振材に関しては、アスファルト系、ゴム系、樹脂系を始め、拘束鋼板を用いる系など有効なものが開発されているが、２ｍｍ以上の厚物鋼板の場合、鋼板自身の振動エネルギーが大きく、このため上記の従来の制振材では制振効果がなく、実用上使用できる制振材や制振方法がない、というのが現状であった。
【０００６】
さらに、建築・構築物用鋼板や、土木建設・作業用機械に使用される鋼板は、必要な強度を発揮するために、内部が中空の袋状の形状に加工される場合が多く、この場合には広範に伝わった振動が袋状の中空部において共鳴を起こし、一層大きな騒音を発生してしまう。
【０００７】
【発明が解決しようとする課題】
そこで本発明は、従来対策し得なかった厚さ２ｍｍ以上の厚物鋼板においても制振効果があり、さらに中空部を形成することによる共鳴現象を防止して、発生する騒音を低減する方法の開発を課題とする。
【０００８】
【課題を解決するための手段】
かかる課題を解決せんとして、本発明者らは鋭意研究の結果、特定の発泡組成物によって中空部を充填することにより、中空部の共鳴を防止し得ることを見出したものであり、しかして本発明の要旨は、以下に存する。
【０００９】
中空部を有する袋状の形状に加工された厚さ２ｍｍ以上の厚物鋼板の共鳴振動防止方法であって、実施直前にポリエステルポリオール、触媒、発泡剤、整泡剤を含む主剤とジフェニルメタンジイソシアネートを含む硬化剤とを反応当量比で混合攪拌された組成物を建築・構築物用、または土木建設・作業用機械用厚さ２ｍｍ以上の厚物鋼板により内部が中空の袋状の形状に形成される該中空部の部分開口部へ注入し、発泡により該中空部を多数のセルによる嵩高性で低密度なフォーム材で充填することを特徴とする厚物鋼板の共鳴振動防止方法。
【００１０】
本発明における中空部を形成する鋼板とは、広く一般に土木・建築・構築物や工業用プラント等に使用されている鋼板であり、厚さは２ｍｍ以上の一般に厚物鋼板と言われるものである。構築物やプラントの構造部材、例えば支柱や横桁、梁、補強材等に使用される。また、各種の土木建設・作業用機械にも使用される。
【００１１】
これらの鋼板は、大きな応力に耐えるために、平面の加工だけではなく、中空部を有する袋状の形状に加工されて使用されることが多い。こうした形状を有する鋼板の制振方法を開発することを目的とする。
【００１２】
本発明に使用するポリウレタンを主成分とする組成物とは、ポリアミン、ポリアミド、ポリオール等の樹脂に、発泡剤、発泡助剤、整泡剤、分散剤、反応触媒等の配合物を分散混合させた主剤と、各種のイソシアネートを予め重合反応等により高分子化したプレポリマーによる硬化剤とからなる。
【００１３】
主剤と硬化剤を反応当量で混合させることにより、プレポリマーがウレタン結合による網目状構造の高分子化合物を作る。この過程において発泡剤が発生するガスにより、高分子化合物は多数のセルと呼ばれる細かく分割された空室を形成する。これらの多数のセルにより嵩高性で低密度なフォーム材ができる。
【００１４】
主剤に使用する樹脂としては、ポリアミン、ポリアミド、ポリオール等が例示できる。特に、中空部を充填して制振性を発揮させるためには、ポリオールの使用が好ましい。
【００１５】
その他の主剤の配合物としては、触媒、発泡剤、各種の添加剤、着色剤、整泡剤などがあげられる。
【００１６】
本発明に使用する硬化剤としては、一般にポリウレタンフォームを生成するために使用されている各種のイソシアネートが例示できる。
【００１７】
イソシアネートとしては、トリレンジイソシアネート、ジフェニルメタンジイソシアネート、ヘキサメチレンジイソシアネート、イソホロンジイソシアネート等があげられる。これらの中でも、ジフェニルメタンジイソシアネートの使用が好ましい。
【００１８】
以上説明した配合物は主剤と硬化剤とに分離して製造保管し、中空部への制振方法を実施する直前に当量比にて混合し、中空部へ注入する。注入方法は、従来公知の方法が制限無く使用できる。主剤と硬化剤を混合攪拌後に中空部の開口部より投入する方法、主剤と硬化剤とを別々にエアレスポンプその他の圧送手段で送り、途中で合流・混合して吐出注入する方法などがあげられる。
【００１９】
【発明の実施の形態】
本発明の理解に供するため、以下に実施例を記載する。いうまでもなく、本発明は以下の実施例に限定されるものではない。
【００２０】
【実施例１】
ポリエステルポリオール、水、触媒、整泡剤を含有する主剤と、ジフェニルメタンジイソシアネートからなる硬化剤を反応当量比で混合攪拌し、厚さ２ｍｍの鋼板により形成された鋼板構築物の構造材の部分開口部より注入し、構造材内部の中空部を発泡充填することにより、制振処理１を行った。
【００２１】
【実施例２】
ポリエステルポリオール、水、触媒、整泡剤を含有する主剤と、ジフェニルメタンジイソシアネートからなる硬化剤を反応当量比で混合攪拌し、厚さ２ｍｍの鋼板により形成された建設作業機械の構造部材中空部に注入し、中空部を発泡充填することにより、制振処理２を行った。
【００２２】
【試験方法】
１）制振処理１を施した構築物と、未処理の構築物に発生する騒音をそれぞれ騒音計により測定し、比較した。
２）制振処理２を施した建設作業機械と、未処理の同じ機械により、同じ作業を行った時に発生する騒音を騒音計によりそれぞれ測定し、比較した。
【００２３】
【結果】
試験結果は以下の通りであった。
１）制振処理１により発生した騒音は、未処理の騒音より５ｄＢ低下した。
２）制振処理２により発生した騒音は、未処理の騒音より８ｄＢ低下した。
【００２４】
【発明の効果】
本発明になる制振方法によれば、従来防音対策が不可能であったため未処理であった場所に、容易に制振処理を行えるため、鋼板構築物などの騒音低減対策が容易となり、また、中空部の共鳴振動により騒音を発生していた作業・建設機械などは、作業時に発生する騒音を著しく減少させることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for damping a steel sheet that forms a hollow portion.
[0002]
[Prior art]
Although it is a steel plate used in every scene because it is excellent in strength, workability, designability, etc., it has physical defects such as heavy, rusty, easy to transmit vibration, and easy to transfer heat. For this reason, various improvements, such as weight reduction by making a thin plate, making a rust-proof steel plate by sandwiching a rust inhibitor, and making a damping steel plate by sandwiching a viscoelastic substance, have been put into practical use.
[0003]
In particular, transportation machinery such as automobiles is a field where it is required to reduce the weight of steel sheets. Modern automobile steel sheets have a plate thickness of about 0.8 mm. Steel plates that have been rusted and damped have been developed, and damping materials made of viscoelastic materials are generally used.
[0004]
However, steel plates used for civil engineering / architecture / construction, industrial plants, work / construction machines, etc. are required to have high strength and rigidity, so they are mostly thick steel plates with a thickness of 2 mm or more. is there.
[0005]
As for the damping material having a damping effect for a steel plate having a thickness of about 0.8 mm, effective materials such as asphalt type, rubber type, resin type, and a system using a restrained steel plate have been developed. In the case of a thick steel plate of 2 mm or more, the vibration energy of the steel plate itself is large. Therefore, the conventional damping material described above has no damping effect, and there is no damping material or damping method that can be used practically. It was the current situation.
[0006]
Furthermore, steel plates used for construction / construction steel plates and civil engineering / working machines are often processed into a hollow bag-like shape in order to demonstrate the required strength. The vibration transmitted over a wide area causes resonance in the bag-like hollow portion, which generates a larger noise.
[0007]
[Problems to be solved by the invention]
Therefore, the present invention provides a vibration damping effect even in a thick steel plate having a thickness of 2 mm or more, which has not been able to be countermeasures in the past, and further prevents a resonance phenomenon caused by forming a hollow portion and reduces the generated noise. Development is an issue.
[0008]
[Means for Solving the Problems]
In order to solve such a problem, the present inventors have found that, as a result of intensive studies, the resonance of the hollow portion can be prevented by filling the hollow portion with a specific foamed composition. The gist of the invention resides in the following.
[0009]
A method for preventing resonance vibration of a thick steel plate having a thickness of 2 mm or more processed into a bag-like shape having a hollow portion, wherein a main component containing a polyester polyol, a catalyst, a foaming agent, and a foam stabilizer and diphenylmethane diisocyanate are added immediately before implementation. A composition obtained by mixing and stirring a curing agent containing a reaction equivalent ratio is formed into a hollow bag-like shape by a thick steel plate having a thickness of 2 mm or more for a building / construction or civil engineering / working machine. A method for preventing resonance vibration of a thick steel plate, characterized in that the hollow portion is injected into a partial opening of the hollow portion, and the hollow portion is filled with a bulky and low-density foam material by a large number of cells.
[0010]
The steel sheet forming the hollow portion in the present invention is a steel sheet that is widely used in civil engineering, architecture, structures, industrial plants, etc., and is generally called a thick steel sheet having a thickness of 2 mm or more. It is used for structural members of structures and plants, such as struts, cross girders, beams and reinforcing materials. It is also used in various civil engineering and work machines.
[0011]
These steel plates are often used after being processed into a bag-like shape having a hollow portion in addition to processing a flat surface in order to withstand a large stress. The object is to develop a method of damping a steel plate having such a shape.
[0012]
The composition mainly composed of polyurethane used in the present invention is a mixture of a foaming agent, a foaming aid, a foam stabilizer, a dispersant, a reaction catalyst, etc. dispersed in a resin such as polyamine, polyamide, or polyol. And a curing agent made of a prepolymer obtained by polymerizing various isocyanates in advance by a polymerization reaction or the like.
[0013]
By mixing the main agent and the curing agent in a reaction equivalent, the prepolymer forms a polymer compound having a network structure with urethane bonds. In this process, the polymer compound generates finely divided vacancies called a large number of cells by the gas generated by the foaming agent. A large number of these cells make a foam material having a low bulk density.
[0014]
Examples of the resin used for the main agent include polyamine, polyamide, polyol and the like. In particular, it is preferable to use a polyol in order to fill the hollow portion and exhibit vibration damping properties.
[0015]
Examples of other main ingredient blends include catalysts, foaming agents, various additives, colorants, foam stabilizers and the like.
[0016]
As a hardening | curing agent used for this invention, the various isocyanate currently generally used in order to produce | generate a polyurethane foam can be illustrated.
[0017]
Examples of the isocyanate include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate. Among these, use of diphenylmethane diisocyanate is preferable.
[0018]
The formulation described above is manufactured and stored separately into the main agent and the curing agent, mixed at an equivalent ratio immediately before the vibration damping method for the hollow portion is performed, and injected into the hollow portion. As the injection method, a conventionally known method can be used without limitation. Examples include a method in which the main agent and the curing agent are mixed and stirred from the opening of the hollow portion, and a method in which the main agent and the curing agent are separately fed by an airless pump or other pressure feeding means, and merged and mixed in the middle to be discharged and injected. .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
In order to provide an understanding of the present invention, examples are described below. Needless to say, the present invention is not limited to the following examples.
[0020]
[Example 1]
From the partial opening part of the structural material of the steel sheet construction formed by mixing and stirring the main component containing polyester polyol, water, catalyst, foam stabilizer and the curing agent composed of diphenylmethane diisocyanate at a reaction equivalent ratio, and formed by a steel plate having a thickness of 2 mm The damping treatment 1 was performed by pouring and filling the hollow portion inside the structural material with foam.
[0021]
[Example 2]
A main component containing polyester polyol, water, catalyst and foam stabilizer and a curing agent consisting of diphenylmethane diisocyanate are mixed and stirred at a reaction equivalent ratio and injected into a structural member hollow part of a construction machine formed of a steel plate having a thickness of 2 mm. And the damping process 2 was performed by foam-filling the hollow part.
[0022]
【Test method】
1) The noise generated in the structure subjected to vibration suppression treatment 1 and the untreated structure were measured with a sound level meter and compared.
2) The noise generated when the same work was performed by the construction work machine subjected to the vibration damping process 2 and the same untreated machine was measured with a sound level meter and compared.
[0023]
【result】
The test results were as follows.
1) The noise generated by the vibration damping process 1 was 5 dB lower than the untreated noise.
2) The noise generated by the vibration damping process 2 was 8 dB lower than the unprocessed noise.
[0024]
【The invention's effect】
According to the vibration damping method of the present invention, it is possible to easily perform the vibration damping treatment in a place that has not been treated since the conventional soundproofing measures were impossible. A work / construction machine or the like that generates noise due to the resonance vibration of the hollow portion can significantly reduce the noise generated during the work.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34875298A JP3976429B2 (en) | 1998-12-08 | 1998-12-08 | Method for preventing resonance vibration of thick steel plate forming hollow part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34875298A JP3976429B2 (en) | 1998-12-08 | 1998-12-08 | Method for preventing resonance vibration of thick steel plate forming hollow part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000170838A JP2000170838A (en) | 2000-06-23 |
| JP3976429B2 true JP3976429B2 (en) | 2007-09-19 |
Family
ID=18399136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34875298A Expired - Lifetime JP3976429B2 (en) | 1998-12-08 | 1998-12-08 | Method for preventing resonance vibration of thick steel plate forming hollow part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3976429B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10041162A1 (en) * | 2000-08-21 | 2002-03-07 | Basf Ag | Composite elements containing polyisocyanate polyaddition products |
-
1998
- 1998-12-08 JP JP34875298A patent/JP3976429B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000170838A (en) | 2000-06-23 |
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