JPS63151447A - Vibration-damping metallic plate - 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] [Industrial Application Field] The present invention relates to base metals and gears of diamond cutters, chip saws, etc., which are used as high-speed rotating bodies.

Or structural materials that require vibration damping properties in moving structures such as automobiles, etc., as well as heat resistance and weldability.

The present invention relates to a vibration damping metal plate suitable for use as a member requiring toughness.

[Conventional technology]

Conventionally, 12Cr3 is a material that requires vibration damping properties.
Those that utilize magnetostriction represented by AQ-Fe and Mn-
Cu-based alloys, cast iron, etc. have been known for a long time, and in recent years, sandwiched steel plates in which a plastic material is sandwiched between steel plates have been put into practical use.

[Problem that the invention seeks to solve]

In these various conventional vibration damping materials, 12Cr-3
Those that utilize magnetostriction represented by Ml-Fe and Kn
-Cu-based alloys have the drawback that their damping performance drops significantly when plastically worked, and that their damping performance also drops even when the temperature rises, and the limit temperature for use is 380°C for the former and 80°C for the latter. Furthermore, there were problems in that the weldability was poor and the manufacturing cost was high. Also.

Cast iron is also a material that has been attracting attention for its vibration damping properties for a long time.
The damping performance is not so good, and the damping performance is simply achieved by its mass, so although it is cheap in terms of cost, it is inferior in plastic workability and weldability, and it is also weak and weak in strength. Due to its stability, there was a problem that it could not be used for structural materials with small cross-sectional areas. Furthermore, sand-inch steel plates, which have a plastic material sandwiched between steel sheets, are a vibration damping material that is currently attracting attention because of their excellent vibration damping performance and the ability to be processed plastically. Since a plastic material is used as the material, the limit temperature for use is as low as 100° C., which not only has poor heat resistance, but also lacks weldability due to lack of conductivity.

In addition, as a very special vibration damping material, the surface layer of the metal plate is treated with grain boundary oxidation, sensitization treatment, or mechanically scratched on the surface.
Methods have also been proposed to impart vibration damping properties to metal plates whose surface layers have been processed in this way, such as by subjecting them to processes such as cold rolling to introduce intergranular cracks or by making surface flaws into bald spots. However, the damping material obtained by this method has problems in that it has poor plastic workability due to the presence of cracks on the surface, and its fatigue strength is also significantly degraded, making it unreliable as a structural material. .

[Means for solving problems]

The present inventors have solved the above-mentioned problems of the prior art, and have developed a damping material that is suitable for use as a member that is plastically workable, requires heat resistance, weldability, toughness, etc., and also has excellent vibration damping properties. As a result of intensive research to develop a shaken metal plate, the metal plates were joined together by biting minute protrusions integrally formed on the surface of the other metal plate into the other metal plate. The present invention was completed by discovering that it is possible to obtain a vibration-damping metal plate with desired characteristics by limiting the bonding area into which the minute protrusions bite into a certain range.

That is, in the present invention, two metal plates are joined by having minute protrusions that are metallurgically integrated on the surface of at least one metal plate bitten into the other metal plate. , the total projected area of the portions of the microprotrusions biting into the metal plate is 1 to 20% of the metal plate, and the portions of the two metal plates where the microprotrusions do not exist are mutually The present invention relates to a vibration-damping metal plate characterized in that the plates are brought into contact without being metallurgically bonded.

Hereinafter, the damping metal plate according to the present invention will be explained in detail with reference to four drawings.

FIG. 1 is a cross-sectional explanatory diagram schematically showing an example of a vibration-damping metal plate according to the present invention, FIG. 2 is a plan view showing an example of the shape and distribution of microprojections, ) is A-A in (a)
(C) is a cross-sectional view taken along the line B-B in (A); FIG. 3 shows another example of the shape of the microprojections;
B) is a sectional view taken along the line C-C in (A), FIG. 4 is an explanatory diagram showing an example of the method for manufacturing a damping metal plate according to the present invention, and FIG. 5 shows a sound pressure level measuring device. Perspective view, Figure 6 (a), (
B) and FIGS. 7A and 7B are a front view and a side view, respectively, showing the shape of a test piece for measuring shear load.

[Explanation of configuration]

In the drawings, reference numeral 1 denotes a damping metal plate according to the present invention, and as shown in FIG. This is a type of composite metal plate that is joined by having minute protrusions 4 that are metallurgically integrated on its surface bitten into another metal plate (metal plate 3 in the illustrated example). The projected area (
In other words, in the illustrated example, the total (hereinafter sometimes simply referred to as the projected area) of the cutting area of the metal plate 3 by the surface on the metal plate 2 side is the area of the metal plates 2 and 3 (also referred to as the combined area). (which is the same as the area of one side of the vibration-damping metal plate 1), and the parts of the two metal plates 2 and 3 where the minute protrusions 4 are not present are metallurgical. They are abutted without being mechanically joined (hereinafter referred to as
According to the illustrated example, the minute protrusions 4 are formed only on the metal plate 2, and the other metal plate into which the minute protrusions 4 bite is only the metal plate 3. This also includes the case where minute protrusions 4 are formed on both metal plates 2 and the minute protrusions 4 are bitten into the metal plates on the other side.
, 3 is the sum of the projected areas of each of the minute protrusions 4, while the areas of the metal plates 2 and 3 do not change)
.

The metal plates 2 and 3 include ordinary steel plates such as ultra-low carbon steel plates and low carbon steel plates, carbon tool steel plates, special steel plates such as stainless steel plates and nickel-chromium molybdenum steel plates, and non-ferrous plates such as aluminum plates, copper plates, titanium plates, and nickel plates. Metal plates, the above-mentioned ordinary steel plates, special steel plates, and plated metal plates made by plating non-ferrous metal plates.

Furthermore, various metal plates such as a clad metal plate made by laminating these various metal plates can be used, and these metal plates have been subjected to carburizing, nitriding, quenching and tempering, etc. in advance depending on the purpose of use of the vibration damping metal plate 1. The material may be subjected to a desired hardening heat treatment to impart not only vibration damping properties but also wear resistance, toughness, and the like. In addition.

The metal plates 2 and 3 mentioned above do not need to be made of the same material, and may be a combination of metal plates made of appropriate materials depending on the intended use of the vibration damping metal plate 1. Needless to say.

The minute protrusions 4 that are metallurgically integrated on the surface of the metal plate 2 are not particularly limited as long as they can bite into the other metal plate 3 to be joined and join the metal plates 2 and 3 together. It's not something you can do. For example, the micro protrusions 4 are formed by surface processing of the metal plate 2, such as cutting or grinding the surface of the metal plate 2, rolling the metal plate 2 with a rolling roll having depressions, etching the surface of the metal plate 2, etc. There may also be welded metal partially welded to the surface of the metal plate 2, welded metal or welded ceramics partially sprayed to the surface of the metal plate 2, or partially plated to the surface of the metal plate 2. It may also be formed with minute protrusions 4 separately fixed to the surface of the metal plate 2, such as plated metal or the like.

The shape of the microscopic protrusions 4 can be broadly classified into dot-like and continuous convex strip-like shapes, and dot-like ones include a conical shape as shown in Fig. 1, Fig. 2 (a), In addition to regular shapes such as a rectangular parallelepiped shape as shown in (b) and (c) and a truncated cone shape as shown in Figure 3, there are irregular mountain shapes obtained by the above-mentioned thermal spraying etc., and convex strip-like shapes. has a shape as a continuum of these. Although any of these shapes can be used, a shape with a rounded corner and a high height is superior in terms of ease of cutting into the other metal plate 3 to be joined. Regarding the size of the minute protrusions 4, the higher the height, the greater the bonding strength at the part of the minute protrusions 4. However, if the height is too high, it will bite into the other metal plate 3 and the bonding strength will increase. It is preferable that the height of the minute protrusion 4 is lower than the thickness of the other metal plate 3 because an indentation will appear on the surface or the tip of the minute protrusion 4 will be exposed on the surface. Also, the size of the base of the microprotrusion 4 and the size of the plane of association with the surface of the metal plate 2, which is also basically the same as the size of the projected surface of the biting part of the microprotrusion 4), i.e. The diameter of the point-like microprojections 4 and the width of the creases in the case of convex stripes should not be made too small in relation to the height of the microprojections 4, and generally 0.1 m or more. Preferably, on the other hand, if the size is too large, the projected area of the microprotrusions 4 biting into the metal plate 3 is controlled to the constant value,
Since the distribution state of the minute protrusions 4 becomes too coarse and the non-uniformity of the vibration damping metal plate becomes significant, it is appropriate to suppress the size to about 5 nn or less.

In the damping metal plate 1 according to the present invention, the minute protrusions 4 having the shape and size as described above are formed on the surface of the metal plate 2 in the form of lines, meshes, or dots as shown in FIG. 2(A). The two metal plates 2 and 3 are joined by being distributed and biting into the metal plate 3, and the parts where the minute protrusions 4 are not present are in contact with each other without being metallurgically joined. 6 [Description of manufacturing method] In order to manufacture the vibration damping metal plate 1 according to the present invention, first, as described above, the surface of the metal plate is processed by rolling with a rolling roll having recesses, etching, etc. A metal plate 2 having minute protrusions 4 having a predetermined shape and size on its surface is prepared by welding, welding, and plating on the plate surface.1 Next, the metal plate 2 and the metal plate 3 are assembled as shown in FIG. As shown in FIG. 2, the fine protrusions 4 on the surface of the metal plate 2 are bitten into the metal plate 3 by cold or warm pressure contact using a rolling roll 5.

Regarding the temperature when performing such pressure welding, the higher the temperature, the easier the pressure welding, but it is difficult to perform pressure welding work at high temperatures, and there are disadvantages such as increased variation in the bonding area. It is preferable to carry out the pressure welding work either warmly or coldly at a temperature of 700°C or less, since the surface texture of the resulting product will deteriorate due to scaling, etc., and if the metal plate is a high carbon steel plate, there is a risk of decarburization. When warm pressure welding is performed, the resulting vibration-damping metal plates exhibit relatively good shear adhesive strength, but further diffusion annealing improves the adhesive strength even further, making it possible to obtain good strength even with a small bonding area. I can do it. When the metal plate is a steel plate, this diffusion annealing is preferably carried out in the ferrite phase region, but since the diffusion rate is low and the effect is small at low temperatures, the temperature is preferably 650°C or higher. When entering the austenite phase region, the diffusion rate decreases, but the effect of temperature rise is large, so 1, 2
It is preferable that the temperature is 00°C or lower, and sufficient diffusion annealing is preferably performed in this temperature range for 0.5 hours or more.

Although FIG. 1 shows a case in which only the metal plate 2 has minute protrusions 4, two metal plates having minute protrusions are also passed between rolling rolls to remove the minute protrusions from the other metal. It can also be cut into the board.

In addition to rolling with the rolling rolls 5, there are pressure welding methods such as pressing and explosive bonding, but since the pressure welding force is strong, it is necessary to select the shape of the minute protrusions 4 that is difficult to break, and Metal plates 2 and 3 without protrusions 4
Pressure contact using the rolling rolls 4 is most preferable in order to bring the parts into contact with each other without metallurgically bonding, that is, without pressure bonding.

[Action and effect]

In the vibration-damping metal plate 1 according to the present invention, a metal plate 2 and a metal plate 3 are joined by biting of minute protrusions 4, and the parts of the metal plates 2 and 3 where no protrusions 4 are present are connected to each other. Since the two parts are in contact without metallurgically bonding, vibration and noise are reduced due to the friction generated in this part. In such a structure, the smaller the projected area of the biting part of the micro protrusions 4, the greater the damping performance, but the lower the bonding strength of the damping metal plate 1; Although the joint strength increases, the vibration damping performance decreases. Therefore.

If the projected area is made too small, the bonding strength between the metal plates 2 and 3 will decrease, resulting in misalignment of the end faces during plastic working and metal plate 2.
The adverse effects of peeling between and 3 are prevented by setting the lower limit of the projected area of the biting part to 1%, and the vibration damping performance decreases if the projected area becomes excessively large. It is possible to prevent the object of the present invention from being achieved too much by setting the upper limit of the projected area of the biting portion to 20%. In this way, in the present invention, by defining the projected area of the biting portion of the micro protrusions 4 within an appropriate range, the vibration damping performance of the vibration damping metal plate 1 is high and the bonding strength is sufficient for practical use. It has become.

Furthermore, since the damping metal plate according to the present invention is a composite metal plate using a non-conductive organic material such as plastic as a bonding medium, it has heat resistance and can be heat treated depending on the purpose of use. Not only can vibration damping properties be maintained,
Conductivity is obtained through the abutting portions that are not metallurgically bonded and the biting portions of the minute protrusions, thereby making spot welding fully possible.

Due to the above-mentioned excellent characteristics, the vibration-damping metal plate according to the present invention has
It is a vibration-damping metal plate suitable for use as base metals and gears of high-speed rotating bodies such as diamond cutters and chip saws, and as structural materials for automobiles, boilers, etc. that require vibration damping properties as well as weldability and heat resistance.

〔Example〕

EXAMPLES Below, the damping metal plate according to the present invention will be explained in more detail with reference to Examples.

In each of the examples described below, the damping performance was determined by suspending the composite metal plate Hammer 8 rotatably attached
is rotated and dropped from a horizontal state, and the sound of the hammer 8 hitting the composite metal plate
The sound pressure level was measured and evaluated based on the sound pressure level.

In addition, the bonding strength as a mechanical property is shown in Figure 6 (a) and (
(b) Or tensile test results of test pieces made by cutting off one side of a composite metal plate with a width of 20 cm and providing a slit with a joint part of 10+ m in length as shown in Figures 7 (a) and (b). The evaluation was based on the shear load obtained by

Examples 1-3. Comparative Examples 1 to 3 Low carbon steel plate thickness 0.8n having the chemical composition shown in Table 1
o cold rolled steel sheet and sheet thickness 1 having the chemical composition shown in Table 2
．． Various composite metal plates including vibration-damping metal plates were manufactured using cold-rolled aluminum plates of 0 rrn as material metal plates.

That is, first, the shape and distribution state on the surface of the cold-rolled steel plate of low carbon steel is as shown in FIG. 2, and the length and width are 89 mm.
Height C is 2 mm and 0.8 mm, respectively.

Microscopic protrusions with a size of 0.4 cm were placed at various lateral spacings of Ω.

They were formed with a vertical spacing of m. For the formation of minute protrusions, an acid etching method is used to apply an acid-resistant film to the areas where the minute protrusions are to be formed, and then etching with acid dissolves the areas without the acid-resistant film. Microscopic protrusions were formed on the surface of the rolled steel plate.

Next, the cold-rolled low-carbon steel sheet on which the micro-protrusions thus obtained and the above-mentioned cold-rolled aluminum plate are stacked and cold-rolled as shown in FIG. These metal plates are joined by biting into a rolled aluminum plate, and the plate thickness is 1.6 nyn, and the projected area of the biting part on the metal plate is various (for example, the horizontal spacing Q is 3.2 m, and the vertical spacing is 3.2 m). When m is 4 m, the projected area is 7%) vibration-damping metal plates (Examples 1 to 3) and composite metal plates (Comparative Examples 2 to 3) according to the present invention were obtained.

Apart from this, the same chemical composition as above (Table 1, 2
The cold-rolled low-carbon steel plates, cold-rolled aluminum plates, and mini-lamb plates shown in Table) were stacked on top of each other with no minute protrusions on either surface, and 6
A clad plate (Comparative Example 1) having a thickness of 1.6 nm was obtained by cold rolling at a rolling rate of 0%. The thicknesses of the low carbon steel layer (cold rolled steel plate portion) and the aluminum layer (cold rolled aluminum portion) of this clad plate were each 09.8+m.

The damping properties and bonding strength of each of the above Examples and Comparative Examples were investigated using the methods described above. The results are shown in Table 3.

Table 3 As is clear from Table 3, the damping metal plate according to the present invention (
It can be seen that Examples 1, 2, and 3) have lower sound pressure levels and superior vibration damping properties than the clad plate (Comparative Example 1).
Note that the difference in sound pressure level between 20 db and 6 db corresponds to a difference of 1/10 and 1/2, respectively, when converted to sound pressure, so the damping performance of the damping metal plate according to the present invention is It is easy to see whether it is superior to the following:

In addition, in Comparative Example 3, in which the projected area of the biting part of the micro protrusions exceeds 20%, the shear load is large and therefore the bonding strength is large, but the vibration damping performance is similar to that of the cladding plate (there is almost no difference from Comparative Example 1). Comparative Example 2, in which a sufficient distribution effect cannot be obtained and the projected area of the biting portion is less than 1%, has a small shear load and cannot be used as a structural material.

Example 4. Comparative Example 4 Plate thickness of stainless steel having the chemical composition shown in Table 4: 1.
On one side of a 0n11 cold-rolled steel plate, there was a minute protrusion with the shape shown in Fig. 3, the diameter d of the bottom surface being 1.3+m, the diameter e of the top surface being 0.3m, and the height f being 0.3mm. As shown in FIG. 2, a cold-rolled stainless steel plate was manufactured in which the horizontal and vertical intervals Q and m were distributed in a manner of 4 degrees each.

Table 4 (wt%) To form the microprotrusions, a rolling method was used in which a roll was provided with depressions in the same shape as the microprotrusions.

In addition, a low carbon steel layer and a stainless steel layer are formed by hot rolling and cold rolling from a low carbon steel having a chemical composition shown in Table 1 and the stainless steel described above, each layer having a thickness of 1.0 ma+ and a plate thickness of 2.0 mm. A 0 mm clad plate was obtained.

The thus obtained cold-rolled stainless steel sheet having minute protrusions and a cladding plate are stacked and cold-rolled so that the minute protrusions bite into the cladding plate, and the stainless steel plate - low carbon steel layer is made of stainless steel. A vibration-damping metal plate (Example 4) according to the present invention was manufactured, which had a three-layer structure, each layer having a thickness of 1.0+no+, and a plate thickness of 3.0 mm.

In the above, a stainless steel cold-rolled steel plate without minute protrusions is used and rolled with a clad plate to produce stainless steel - low carbon.

A clad plate (Comparative Example 4) consisting of three layers of steel and stainless steel and each layer having a thickness of 1.0 m and a plate thickness of 3.0 mm was obtained.

Table 5 shows the results of examining the vibration damping properties and bonding strength of Example 4 and Comparative Example 4 thus obtained by the same method as above.

Table 5 As is clear from Table 5, the three-layer damping metal plate (Example 4) according to the present invention is different from the three-layer cladding plate (Comparative Example 4) having the same metal layers and plate thickness. In comparison, the sound pressure level is low and the shear load is high at 69 kgf, making it fully possible to use it as a structural material and showing excellent properties as a vibration damping metal plate.

Margin Examples 5 to 7 below. Comparative Examples 5 to 8 Linear overlay was applied to one side of a 1.6 m thick cold rolled steel plate of carbon tool steel (SK5) having the chemical composition shown in Table 6 by IG welding to form a lattice pattern. This was done to form microprotrusions.

Table 6 (wt%) The cross-sectional shape of this microprotrusion is approximately semicircular with a height of 1m and a width of 2m, and by changing the density of the grid lines, the projected area of the microprotrusion on the steel plate surface can be Various proportions were obtained.

One cold-rolled steel sheet of carbon tool steel having minute protrusions obtained in this manner was stacked with another sheet having the same chemical composition and thickness except that no minute protrusions were formed, and then cooled. After rolling, the damping metal plate according to the present invention was annealed at 700°C for 1 hour and had a thickness of 3.2 mm (Examples 5 to 7).
and composite metal plates (Comparative Examples 6 to 8) were manufactured.

Separately from the above, a single cold-rolled steel plate of carbon tool steel with the same chemical composition (Table 6) with a plate thickness of 3.2 mm was annealed under the same conditions as above, and a comparative vibration-damping metal plate (Comparative Example 5) was annealed under the same conditions as above. ).

Table 7 shows the results of similarly examining the vibration damping properties and bonding strength of composite metal plates and single plates manufactured by the above and above methods for each of the Examples and Comparative Examples thus obtained. .

Table 7 Note 1) ★: Peeled off without being pressure-welded during rolling Note 2)
Comparative Example 5 is a single steel plate, as is clear from Table 7, a damping metal plate according to the present invention (
Examples 5, 6, and 7) have lower sound pressure levels and better vibration damping properties than the single-plate comparative material (Comparative Example 5), and have a large shear load of 55 kgf or more, making them suitable as structural materials. It can be seen that it is fully usable. In Comparative Example 8, in which the proportion of the projected area of the biting part of the minute protrusions exceeds 20%, the shear load is high, but the sound pressure level is not much different from that of a single plate, and a sufficient vibration damping effect cannot be obtained. In Comparative Example 6, where the projected area ratio of the biting part is 0.2%, the two cold rolled steel plates peeled off after rolling and the joint state could not be maintained; In Example 7, even if the bonded state was maintained, the shear load was extremely small, so it could not be used as a structural material.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram schematically showing an example of a vibration-damping metal plate according to the present invention, FIG. 2 is a plan view showing an example of the shape and distribution of microprojections, ) is A-A in (a)
(C) is a cross-sectional view taken along the line B-B in (A); FIG. 3 shows another example of the shape of the microprojections;
B) is a sectional view taken along the line C-C in (A), FIG. 4 is an explanatory diagram showing an example of the method for manufacturing a damping metal plate according to the present invention, and FIG. 5 shows a sound pressure level measuring device. Perspective view, Figure 6 (a), (
B) and FIGS. 7A and 7B are a front view and a side view, respectively, showing the shape of a test piece for measuring shear load. In the drawings l... Vibration-damping metal plate 2 according to the present invention... Metal plate 3... Metal plate 4... Minute protrusions 5... Roll roll 6... Support column Frame 7... Thread 8... Hammer 9... Bearing 10... Microphone 11... Amplifier X... Composite metal plate No. 1121 Figure 2 (A) B, J 3rd w1 (A) 4121 Figure 5 6rM (A) (O) 171m (A) (O)

Claims (1)

[Scope of Claims] 1 Metal plates are formed by having minute protrusions that are metallurgically integrated on the surface of at least one metal plate bitten into the other metal plate. are joined, and the total projected area of the portions of the microprotrusions biting into the metal plate is 1 to 20% of the metal plate, and
A vibration-damping metal plate characterized in that parts of the two metal plates in which minute protrusions do not exist are brought into contact with each other without being metallurgically bonded. 2. The damping metal plate according to claim 1, wherein at least one of the metal plates is a common steel plate. 3. The damping metal plate according to claim 1 or 2, wherein at least one of the metal plates is a special steel plate. 4. The damping metal plate according to any one of claims 1 to 3, wherein at least one metal plate is a nonferrous metal plate. 5. The damping metal plate according to any one of claims 1 to 4, wherein at least one metal plate is a clad metal plate. 6. The damping metal plate according to any one of claims 1 to 5, wherein the minute protrusions are formed by processing the surface of the metal plate. 7. The vibration-damping metal plate according to any one of claims 1 to 5, wherein the minute protrusions are formed by separately adhering to the surface of the metal plate.