JPS5942739B2 - Method of manufacturing high damping material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a highly attenuated material used in audio equipment, industrial machinery, etc. that requires reduction of vibration and noise.

First, the basic concept of the present invention will be explained. As shown in FIG. 1A, a material 1 has grooves 2 formed on its surface, and as shown in FIG. When spread or stretched, an interface 4 as shown in Figure 2 is formed.
Rolled materials 1a and Ib containing a and 4b are obtained.

Considering the process in which the material 1 is spread or stretched, if the material 1 is a flat plate, the side walls and bottom walls of the groove 2 bulge inwardly due to pressure from above and below, causing the cross-sectional shape to change. It is considered that an inverted T-shaped interface 4a (opening in Figure 1) is formed.

It has been confirmed that when an interface exists inside a material, consideration of its shape improves the damping performance of the material. However, when a foreign material 3 is present in the groove 2 (Fig. 1 c), the deformation and restraint situation in the internal direction of the groove 2 is different from that at the opening in Fig. 1, and at the same time, part or all of the foreign material 3 is It stays inside groove 2.

Therefore, the interface shape 4b is significantly different from the above-mentioned interface shape 4a, as shown in FIG. The present invention was made based on the above-mentioned basic concept, and aims to provide a method for manufacturing a high-damping material with excellent damping performance and mechanical performance. It is characterized by spreading or stretching after inserting a foreign material into the groove. The present invention will be described in detail below with reference to examples.

(i) Pitch 5.5mm grooves with a width of 2.5mm and a depth of 50mm on the surface of a steel plate SS4l (250 x 450 x 10t)
2.4φ in these grooves.
After inserting a welding steel wire (different material), the plate is rolled in the longitudinal direction of the groove to a plate thickness of 2.0 m with a cross-sectional shape as shown in Figure 1-2.
A thin plate of m was prepared. Next, a sample (30 x 145 x 2 tons) was cut out from the thin plate in a direction perpendicular to the groove.
After annealing at ℃×1/2 hr, damping performance was measured by a transverse vibration method. The results are as shown by mark A (black circle) in FIG. On the other hand, a sample similar to the above (one in which no foreign material (welded steel wire) was inserted into the groove) was measured in the same manner. The results are as shown by mark B (white circle) in FIG. The above results show that in the former sample in which a foreign material is inserted into the groove, the damping performance does not change much even if the maximum strain amplitude increases, whereas in the latter sample in which a foreign material is not inserted in the groove, the maximum strain amplitude It is clear that the damping performance is significantly reduced when the value is 10-4 or more.

In addition, when samples with the foreign material inserted and samples without the foreign material inserted are cut out in the direction parallel to the groove, the damping performance of the former is marked C (black square mark), while the latter is marked D ( It is represented by a white square mark).

In other words, the damping performance of the latter is almost the same as the damping performance E of the material, but the damping performance of the former is 2.1× higher than that of the latter.
It can be easily understood from FIG. 2 that it is about 10-2. A plurality of the foreign materials 3 may be inserted into one groove 2, and it is effective to use a hard material for the material 1.

In addition, when bending deformation occurs in the direction parallel to the groove,
It is better to use a different material that has a Young's modulus different from that of the material.
(11) (A! Figure 3 A and Figure 3 are enlarged views of the interfaces in Figure 1 and Figure 2. From this, the interface that contributes to vibration damping for bending moment 5 has the maximum strain amplitude. In a small area, the interfaces 4a1 and 4a2 in FIG.
In the mouth of FIG. 3, these are interfaces 4b1, 4b2, 3a, and 3b.

The degree to which the interface contributes to vibration damping depends on the shape of the interface.
In Figure 3A, interface 4a2 is larger than interface 4a1, and in Figure 3, interface 3b is larger, interface 4b1 is larger, and interfaces 3a and 4b are larger.
There are two relationships. However, in order for the above-mentioned interface to effectively exhibit vibration damping, it is necessary that the interface exists at a position (0.1 x 0.7) x plate thickness from the surface.

Therefore, in Figure 3 A, the depth of the groove is (0.1 to 067) x
It is sufficient to process the material to make it thicker, but in order to set the interface 3a to (0.1 to 0.7) x board thickness in Figure 3, it is necessary to make the depth of the groove in the material even deeper. be. Therefore, in order to make the attenuation performance of the sample shown in Fig. 3A and mouth almost the same, the position of the interface 3b from the surface should be changed to the interface 4a2.
must be greater than that of

For this reason, it is presumed that the mechanical properties of the sample shown in FIG. 3A are lower than those of the member shown in FIG. 3A, so that the effect of inserting a foreign material into the groove is significantly reduced. In this example, in order to improve the above points, after inserting a different material into the groove provided in the material, the macroscopic shape of the interface obtained by spreading or stretching is adjusted. This will be explained in detail next.

A plate 1 having a groove having the same shape as in item (1) above was used, and a plate (SNCM) with a width of 2.5 mm and a thickness of 0.8 mm was placed near the bottom of the groove.
8) By inserting 6 and then processing in the same manner as in item (1) above, material 1c having the cross-sectional shape shown in FIG. 4A was obtained.

When the damping performance of this material was measured in the same manner as in section (1) above, the logarithmic damping rate was 5.3 x 10-2 (
Maximum amplitude: 5 x 10-4). Next, a fatigue test piece (120 x 15 x 2 tons) was taken from the above material and subjected to a double-sided fatigue test. As a result, the fatigue limit (N-1
07) was 1.4 times that of the material in item (1) above. 3)
A different material (width 25, thickness 3
．． 2. The central part 1.8) was inserted into the bottom of the groove of the material in item (4) above, processed in the same manner, and a test piece was taken and measured.

As a result, a material 1d having the cross-sectional shape shown in FIG.
Moreover, the fatigue limit was 1.7 times that of the material in item (1) above.
The reason for this is that when the bending 5 acts on the material 1d due to vibration, the deformation of the surface and the area surrounded by the interface 4a and the interface 7a is in the direction of making close contact at the interface 7a, resulting in large frictional damping. It seems that this is for the purpose.

Furthermore, in the bending direction 5a, the portion surrounded by the surface and the interfaces 4a and 7a becomes a so-called leaf spring.
Attenuation is expected to be due to the viscoelasticity of the material itself. (C) Fourth
As shown in Fig. 2, a different material 8 (width 2.5 mm x height 2.0 mm) with a triangular cross section is inserted into the bottom of the groove 2 provided in the material 1c, and then rolled alternately in a direction perpendicular to and parallel to the groove 2. By this, material 1 having a cross-sectional shape as shown in FIG.
generated e.

A sample was taken from this material 1e and its attenuation performance was measured. As a result, the logarithmic attenuation rate was a large value of 9.0 x 10-2. The reason for this is that when bending 5 acts on the material 1e, the portion surrounded by the surface, interface 4a, and interface 8a deforms more easily than the portion surrounded by the surface, interface 4a, and interface 8c. Therefore, the contact at the interface 4a is more dense than in the case of Fig. 3 and Fig. 4 A. As mentioned above, after inserting the foreign material into the groove of the material, it is difficult to spread or expand it. Adjustment of the macroscopic shape of the interface obtained by the method, namely, changing the shape of the interface edge of the component parallel to the surface (Fig. 4 A), changing the interface direction of the component parallel to the surface (Fig. 4 C), and changing the interface direction perpendicular to the surface. By changing the interface shape to make the contact state of the interface of the directional component dense (FIG. 4(e)), the damping performance or fatigue characteristics can be improved.

(1)) Pure Al plate (250 x 450 x 10t) with a width of 2.
5m77! , a groove with a depth of 5.0 mm was provided in a striped pattern with a pitch of 5.5 mm, and after inserting a welding steel wire (2.4φ) 9 with a gear-shaped cross section (Fig. 5 A) into the groove, It was rolled in a direction perpendicular to the direction and the groove to form a thin plate 1f having a thickness of 2.0 mm as shown in the opening of FIG.

A sample (30 x 145 x 2 tons) was taken from this plate and its damping performance was measured by a transverse vibration method. As a result, the logarithmic damping rate was 5.1 x 10-2 (maximum strain amplitude: 10-4).
On the other hand, the logarithmic attenuation rate when a general welding steel wire was used was 2.2 x 10-2. Also, instead of the above A' steel wire for welding, 18-
18 stainless steel thin wire (0.2φ, 9800CX2→
The damping performance was measured after rolling in the same manner as above using a material (water-cooled material) rolled into a complicated shape (the true volume is the same as the Al steel wire).

As a result, the macroscopic shape of the cross section was almost the same as that shown in the opening of Figure 5, but the microscopic shape was complicated due to the aluminum material entering the voids of the thin stainless steel wire at the interface, and its logarithmic attenuation. The ratio was 6.9 x 10-2. When micro-shaped irregularities are provided on the spread or stretched interface as described above, the sliding resistance of the interface can be increased and the damping performance can be improved.

1) Highly attenuating materials with built-in interfaces may cause the following problems during normal use and manufacturing processes.

(a) After long-term use at large amplitudes, the interfaces will wear out and the damping performance will deteriorate.

(b) Corrosive substances such as moisture enter and remain between the interfaces, causing corrosion at the interfaces, resulting in sticking by corrosion products at the interfaces or increasing the width between the interfaces, resulting in a reduction in damping performance.

(c) When used at high temperatures for a long period of time, the interfaces become stuck and bonded to each other, resulting in a decrease in damping performance.

(d) During the spreading and stretching process, the material and the different material stick together, and there is no apparent interface.

In this example, the above-mentioned problems were solved by using the materials shown in Table 1 below and different materials, and the details thereof will be described below.

First, regarding (a) above, a sample was processed and sampled in the same manner as in section (1) above, and the damping performance was measured.

In this case, the damping performance was also measured at the point in time when the number of repetitions was N=107 at a maximum amplitude of 5×10 −4 .
From this, the damping performance generally decreases as the number of repetitions increases, but the degree of decrease in waterfall 2 is smaller than that in waterfall 1.
Furthermore, the degree of decrease in Rin 3 to Rin 5 is even smaller. Therefore, it is effective to reduce the hardness of the material, the different material, or both (Taki 3, 4), or to consider the combination of the material and the different material at the interface (.462, 5). the above(
Regarding b), the grooves of SS4l were made of different materials shown in Table 2 below, processed in the same manner as in item (1) above, samples were collected, and the damping performance was measured after conducting a corrosion test.

The results are shown in Table 2. From Table 2 above, the decline in attenuation performance before and after the sample is extremely small and can be ignored for waterfalls 3 and 4, whereas /F6l, 2
In this case, the damping performance decreases, and the decrease is particularly large in waterfall 2.

On the other hand, when observing the cross-sectional state of the interface after the test, it was found that in Taki 1, corrosion progressed along the interface, so the interface width partially widened, and in 7f62, the chip-shaped Cr plating layer destroyed by rolling scraped the interface. , corrosion had progressed severely. Further, in 7f63, only slight corrosion was observed along the interface rather than the surface, and in Taki 4, no corrosion was observed. Therefore, it is necessary to consider the combination of materials at the interface (washing 2, 3), and it is effective to configure the interface with a corrosion-resistant material (7f64). Regarding (c) above, the damping performance of the material No. 1 in Table 2 was measured after holding it at 600° C. and 800° C. for 1 hr, respectively. As a result, the logarithmic decay rate is 5.0×10−2, 3.0×10−2
It was hot. on the other hand. /161, when using Ni-plated 2.4φ welding steel wire as the dissimilar material, 4.9
×10−2, 4.8×10−2. This is because the interface was partially fixed during the heat treatment mentioned above, and also due to the N
It is thought that the degree of adhesion was less for those with i plating. Therefore, when used at high temperatures, consideration must be given to the material forming the interface. Regarding (d) above, rolling was performed at 300° C. using a 2.4φ aluminum wire as a different material in the second Omotetaki 3.

The damping performance of the material obtained in this way is
It was 0.5 x 10-2 or less, which is equivalent to Tohoma. When I looked at the cross section, I found that the material and the foreign material were almost completely stuck together.
The interface between the two was hardly recognized. On the other hand, 7f63 in Table 2 provides a material exhibiting high damping performance. As described above, damping performance can be improved by making a part of the interface obtained by spreading or stretching so that the material and the different materials or the different materials come into contact with each other.

Ij) Width 2.5m on pure Al plate (250 x 450 x 2t)
Grooves with a depth of 5.0 m and 71 L are provided in a striped pattern with a pitch of 5.5 m and 1 L, and a welding steel wire (different material) having a gear-shaped cross section is inserted into this groove.

Thereafter, it was rolled in the direction of the groove, and then rolled in the direction perpendicular to the groove (different material) to create a thin plate. The tensile strength and damping performance of this plate are as shown in Taki 1 in Table 3 below. Washing 2 in the same table is made of the same material as 7I61, but no foreign material is inserted into the groove. In addition, for waterfall 3, welded steel wire (2.0φ x 2mm) 5m7 in the groove made of the same material as waterfall 1.
! This shows the material inserted and rolled at L intervals. From this Table 3. /F6l has greater tensile strength and damping performance in the direction perpendicular to the groove than Fu2. 46.3 is. It is clear that the tensile strength and damping performance in the groove direction are greater than that of 462.

By inserting a different material into the groove of the material as described above,
Tensile strength and damping performance can be improved.

In particular, rolling the dissimilar material perpendicularly or crosswise to the longitudinal direction is effective in preventing the dissimilar material from breaking due to rolling. (V) Steel plate SS4l (250 x 450 x 10t
) grooves with a width of 2.5 mm and a depth of 5.0 mm are provided in a striped pattern with a pitch of 5.5 mm, and after inserting a different material of viscoelastic material as shown below into these grooves, rolling is performed in the longitudinal direction of the groove. A thin plate was created. (a) 2.4φ polyethylene rod (b) 2.4φ butadiene rubber rod (c) 2.

4φ pure lead rod material (d) 2.4φ polyethylene rod and a width 2.5×
Next, a sample was taken from the thin plate and the damping performance was measured.

The results were as follows. As a result of measuring the damping performance at 80°C for the sample using the different materials shown in (a) above, the logarithmic damping rate was 1/2 compared to the case at 30°C.
．． It became 8. On the other hand, commercially available Sandi I Tsuchi board (SUS
3O4O. According to the results of similar measurements, the value at 30°C is greater than the value of the logarithmic attenuation rate in (a) above, but the value at 80°C is 1. .0×1.0-
It was 2 or less. As described above, by applying internal pressure to the material using a different viscoelastic material, it is possible to improve the damping performance at room temperature and to reduce the deterioration of the damping performance even at relatively high temperatures.

As explained above, according to the present invention, it is possible to produce a high damping material with excellent damping performance and mechanical performance.

[Brief explanation of drawings]

FIGS. 1 to 5 are explanatory diagrams showing an embodiment of the method for manufacturing a high-damping material according to the present invention. 1...Material, 2...Concave groove, 3,8...
...Different material, 3a, 3b, 74a? 4a1?4a2ra4
bra4b174b2...interface.

Claims (1)

[Scope of Claims] 1 A large number of grooves are provided on the surface of the material, and after inserting a different material into these grooves, the gap between the side walls of the groove, the side wall and the bottom wall, or the space between the different material and the side wall and the bottom wall. 1. A method for producing a high-damping material, which comprises spreading or elongating the material so as to form an interface that rubs against the material. 2. A method for manufacturing a high-damping material according to claim 1, characterized in that unevenness is provided on the interface obtained by spreading or stretching. 3. The method for producing a high attenuation material according to claim 1, wherein a part of the interface obtained by spreading or stretching is made such that two different materials come into contact with each other. 4. The method for manufacturing a high-damping material according to claim 1, characterized in that the spreading or stretching is carried out at right angles to the longitudinal direction of the dissimilar materials or perpendicularly to each other. 5. The method of manufacturing a high damping material according to claim 1, characterized in that steel is used as the raw material and a viscoelastic substance is used as the different material.