JPH0321444A - Resin sandwiched type damping thick steel plate excellent in weldability - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin sandwich type damping thick steel plate with excellent weldability.

[Prior Art] In recent years, in the fields of ships, industrial machinery, building structures, etc., there has been an increasing need to reduce vibration and noise generated from engines, etc., and vibration damping materials that meet these needs have been desired. ing. In this regard, for example, a resin sandwich type damping thick steel plate disclosed in Japanese Patent Application Laid-Open No. 83-158242 has a high damping performance and is highly effective in reducing vibration and noise of ships, industrial machinery, and building structures. It is considered to be a promising material.

[Problems to be Solved by the Invention] However, since the resin sandwich type damping thick steel plate has a resin layer, some discontinuous welding such as spot welding is possible, but it is difficult to weld thick steel plates. When performing continuous welding such as arc welding, which is essential for At present, the quality of the arc weld is reduced by creating blowholes, such as reducing the strength of the weld, and as a result of the limited construction methods, its applications are currently being significantly narrowed down.

One way to solve this problem is to remove 10 to 20 mm of resin from the groove surface where butt welding is performed, for example, but when manufacturing large structures such as ships, the groove surface where welding is performed It can be said that it is extremely difficult to remove the thin resin layer between the steel plates from the surface.

Also, for the same reason, shield welding and lap welding may be performed after removing the resin, but
This is also difficult.

As described above, resin sandwich-type damping thick steel plates have high damping performance, but they are not widely used because continuous welding such as arc welding is difficult in practice, and improvements in arc weldability are desired. It is rare.

[Means for Solving the Problems] The present invention advantageously solves the above problems,
The gist is a resin sandwich type vibration damping thick steel plate with excellent weldability, in which a resin sandwich type vibration damping metal plate with a smaller area than a thick steel plate is placed in the center of the thick steel plate surface via an adhesive resin, and a plate thickness of 6 ■ From the thick steel plate above,
A damping metal plate with a damping resin of 0.02 to 6.0 mm thick is placed between two metal plates with a side length of 10 mm or more and a small thickness of 0.02 to 6.0 mm. This is a resin sandwich-type damping thick steel plate with excellent weldability, which is placed in the center of the thick steel plate with adhesive resin interposed in between.

[Function] The present invention is a resin sandwich-type vibration-damping thick steel plate that can be easily arc-welded and has excellent other properties, ie, strength and bending workability. In other words, the resin sandwich type damping thick steel plate of the present invention has a damping metal plate on one side of a thick steel plate that provides welding strength and rigidity, and a resin sandwiched between two metal plates with a smaller area than the thick steel plate. A welding groove is formed around the thick steel plate by attaching it to the center of the thick steel plate. In other words, since there is no vibration damping metal plate laminated with resin near the welding groove, there is no problem in performing arc welding, and welding similar to ordinary steel plate welding can be performed, making it an excellent arc welding method. This enables welding at any location around thick steel plates. In other words, in order to reduce gas generation, stabilize the arc, and prevent blowholes from forming in the welding part,
The side length of the damping metal plate attached to the thick steel plate is 10 mm.
In other words, the weld groove surface is one side of the thick steel plate, but by keeping the damping metal plate 5 mm or more away from that surface, gas generation due to resin burning during arc welding will be significantly reduced. At the same time, the welding arc is stabilized, blowholes in the weld are significantly reduced, and the soundness of the weld is extremely high.

Thick steel plates are welded to the welded material after arc welding, and must be thick to provide welding strength. In order to ensure the welding strength required for ships, industrial machinery, and building structures, it is necessary that the plate thickness be 6 mm or more. Regarding the strength of steel, steel having a strength of about 25 to 150 kgf/mm2 can be used depending on the level of strength and toughness required for the application.

The damping metal plate is made by placing a resin between two metal plates, and the metal plates can be made of, for example, steel plates, stainless steel, non-ferrous metals, etc. Thick steel plates require strength characteristics such as rigidity and bendability, as well as formability. The rigidity of a conventional resin sandwich type vibration damping steel plate, in which a resin is inserted between two steel plates and the two skin steel plates have the same thickness, is that of a single steel plate with the same thickness. It is 70-90%,
In order to obtain the same rigidity, the thickness of the damping steel plate must be increased, resulting in an increase in weight. In contrast, in the present invention, the properties such as welding strength and rigidity are provided by the thick steel plate, and the vibration-damping metal plate bonded thereto with resin is solely responsible for the damping property of reducing vibration and sound. Therefore, in order to reduce the weight increase as much as possible, it is better to use a thin damping metal plate. Regarding the thickness of the resin used for the vibration damping metal plate,
If the resin thickness becomes significantly thinner than the roughness of the metal plate, the resin will not be able to adhere to the surface of the metal plate, so the lower limit of the thickness is set at 0.02 Inlll. In addition, if it is thicker than necessary, a large amount of resin will be required when manufacturing a resin sandwich type damping thick steel plate, which will increase the cost, so the upper limit of the thickness should be set as B. Let it be Omm. As the metal plate, a nonferrous metal plate such as a steel plate, an aluminum plate, a titanium plate, a copper plate, etc. can be used. The resin may be a rubber-based, polyethylene-based, polyolefin-based, polyisobutyl-based, epoxy-based resin, etc., which are commonly used for resin sandwich type vibration damping thick steel plates.
It may be a thermosetting type, a thermoplastic type, a resin that utilizes a cross-linking reaction, etc. Alternatively, a resin in which metal powder, metal net, wood powder, paper powder, carbon powder, resin powder, etc. are mixed depending on the purpose may be used.

Similarly, the adhesion between the thick steel plate and the damping metal plate is 0.02 to 6.
This is done with On+m resin, but if you use room temperature curing resin, you can attach a damping metal plate to the thick steel plate already used in the structure, and vibration and noise countermeasures are already taken. 1 for the completed structure
is also possible.

For lamination, a hot press method, a roll pressure bonding method, etc. can be used.

Next, the construction of the resin sandwich type damping thick steel plate with excellent weldability of the present invention will be explained using drawings. In Fig. 1, a thick steel plate 5 with a thickness of 6 mm or more is provided with a thickness of 0.02 mm between two metal plates 1 and 3 whose side length is 10 mm or more shorter than the thick steel plate and whose thickness is smaller. ~6. hm
The damping metal plate 6 is made of a resin sandwich-type damping thick steel plate in which the damping metal plate 6 is laminated with an adhesive resin 4 of 0.02 to 6.0++ m.

[Examples] Examples of the present invention are shown in Table 1 along with comparative examples. The damping thick steel plate was manufactured by hot pressing method. At that time, the maximum heating temperature was 200 t: and the pressing force was 3 kgf/cab'. The resin used is polyolefin-based thermoplastic resin. During welding, gas generation and welding arc stability were visually observed. Furthermore, after welding, the welded portion was cut at right angles to the arc weld line to examine the occurrence of blowholes. When the gas generation during welding was very small, it was judged as O, when it was small, it was judged as ○, and when it was large, it was judged as ×. Regarding arc stability, cases where continuous welding is possible are judged as ○, and cases where intermittent welding is possible are judged as poor. Furthermore, regarding the occurrence of blowholes, the case where there were few blowholes was judged as ○, and the case where there were many blowholes was judged as ×.

As is clear from Table 1, all of the examples exhibited excellent weldability, with less gas generation during arc welding, more stable arcs, and fewer blowholes in the welded areas than in the comparative examples.

On the other hand, in Comparative Example 4, the distance from the welding groove surface to the damping thick steel plate was 0, so gas generation during welding, arc stability was poor, and many blowholes were generated. Comparative Example 5 is made by laminating a thin plate to a thick steel plate with a resin, and although the weldability is good, the loss coefficient η is low because the laminated plate is a blank thin plate. Comparative Example 6 is a conventional resin sandwich type damping thick steel plate in which the two skin steel plates have the same thickness. Since the distance from the welding groove surface to the damping thick steel plate is O, gas generation during welding, arc stability is poor, and many blowholes occur.

[Effects of the Invention] As explained above, the resin sandwich type damping thick steel plate of the present invention has excellent weldability, and can be used with resins that require high weldability mainly for ships, industrial machinery, building structures, etc. This will greatly contribute to the application of sandwich-type damping thick steel plates.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a resin sandwich type damping thick steel plate of the present invention. ! ... Metal plate 2 ... Damping resin 3 ...
Metal plate 4...Adhesive resin 5...Thick steel plate
6... Vibration-damping metal plate and 4 others Figure 1: Metal plate 2: Vibration-damping resin 3: Metal plate 4: Adhesive resin 5: Thick steel plate 6: Vibration-damping metal plate

Claims (1)

[Scope of Claims] 1. A resin sandwich-type vibration-damping thick steel plate with excellent weldability, in which a resin-sandwich-type vibration-damping metal plate having a smaller area than the thick steel plate is arranged at the center of the surface of the thick steel plate via an adhesive resin. 2. A damping resin with a thickness of 0.02 to 6.0 mm is placed on a thick steel plate with a thickness of 6 mm or more between two metal plates whose side length is 10 mm or more shorter and smaller in thickness than the thick steel plate. A resin sandwich-type vibration-damping thick steel plate with excellent weldability, in which a vibration-damping metal plate with a 0.02 to 6.0 mm adhesive resin is placed in the center of the thick steel plate.