JPH05222467A - Laminated bending member for damper - Google Patents

Abstract

PURPOSE:To improve strength, stress resistance relaxing characteristic and environment resistance characteristic by laminating aramid fibers or carbon fibers on a copper alloy material. CONSTITUTION:Aramid fibers or carbon fibers excellent in vibration fatigue resistance are laminated on a copper alloy material excellent in strength, stress resistance relaxing characteristic and environment resistance characteristic by which a laminated bending member for damper can be formed. As for the form of lamination, arbitrary form of lamination, such as form for which the fibers are laminated on one side or both sides of the copper alloy material and a form where the copper alloy material and the fibers are alternately laminated, can be adopted. It is preferable that the copper alloy material has a composition consisting of, by weight, at least one kind among 1.2-3.6% Ni, 0.3-1.0% Si, 0.2-2.5% Be, 0.2-4.5% Ti, 0.1-3.5% Sn, 0.1-2.5% Co, 0.1-5.0% Zn, and 0.05-0.5% Mg and the balance Cu with inevitable impurities.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite bending member for a damper which is excellent in strength, stress relaxation resistance, vibration fatigue resistance and environment resistance.

[0002]

2. Description of the Related Art A member for a damper having a vibration absorbing ability is used for a fixture for fixing pipes accompanied by vibration such as a duct to a building wall portion, etc., in order to prevent vibration noise.
For this damper member, an elasto-plastic damper member utilizing the elasto-plastic deformation of metal itself has been put into practical use. However, in this elasto-plastic damper member, the frequency range of vibration that can be absorbed is limited depending on the material of the metal material used, so it is necessary to use various damper members properly according to the application, It was also disadvantageous in terms of cost.
For this reason, as the damper member, a damper bending member formed by corrugating a metal material has been used. This bending member for damper absorbs vibration by elasto-plastic deformation of its corrugated portion, and its vibration absorption ability is not influenced by the material of the metal material, and therefore the metal material can be selected from a wide field of view. was there. By the way, in the bending member for damper, strength enough to support pipes, stress relaxation resistance capable of maintaining a waveform, vibration fatigue resistance resistant to vibration absorption, and bending member for damper are
Since environmental factors such as temperature, pressure and humidity are placed under severe conditions, environmental resistance characteristics that can withstand such a corrosive environment have been required.

[0003]

However, ordinary steel (for example, SS-490) and phosphor bronze alloy that have been conventionally used as bending members for dampers do not satisfy the above characteristics, and new materials have been developed. Was strongly demanded. From this, the present inventor has made various copper alloy materials as prototypes and investigated the suitability, but among the characteristics required for the bending member for the damper, the characteristics that should sufficiently satisfy the vibration fatigue resistance. No material was obtained.

[0004]

The present invention has conducted intensive studies in view of such a situation, and by combining a copper alloy material with aramid fiber or carbon fiber, the vibration bending fatigue resistance of the bending member for damper is sufficiently high. Found that the value can be improved,
After further research, the present invention has been completed. That is, the present invention is characterized in that a copper alloy material excellent in strength, stress relaxation resistance and environment resistance is combined with aramid fiber and / or carbon fiber.

The composite bending member for a damper of the present invention is a composite of aramid fiber and / or carbon fiber in a copper alloy material, and the copper alloy material mainly functions to maintain high strength and stress relaxation resistance. In fact, the aramid fiber and the carbon fiber are responsible for improving the vibration fatigue resistance, and the fiber is coated with a copper alloy material to improve its environmental resistance. The composite form of the composite bending member for a damper of the present invention is, as illustrated in FIGS. 1A to 1E, a composite of the aramid fiber 2 on one surface of the copper alloy material 1 (FIG. A), a plurality of coppers. The alloy material 1 and the aramid fiber 2 are alternately compounded (Figs. B and C), the copper alloy material 1 is compounded so as to cover the entire outer periphery with the aramid fiber 2 (Fig. D), and both surfaces of the copper alloy material 1 are covered. Any composite form such as a composite of aramid fibers 2 (Fig. E) is applied. The composite of the aramid fibers 2 shown in the above-mentioned FIG. 2 along the entire circumference of the copper alloy material 1 is a composite form in which the advantage of the high corrosion resistance of the aramid fibers 2 is fully exhibited. In the above, carbon fiber may be used instead of aramid fiber, or aramid fiber and carbon fiber may be used in combination.

In the present invention, usual commercial products can be applied to the aramid fiber or carbon fiber which is compounded with the copper alloy material. Further, as the compounding method, a method of warm pressure bonding with an adhesive is preferable because high bonding strength can be obtained. Further, as the fibers, a large number of fibers may be directly arranged on the surface of the copper alloy material in the vertical and horizontal directions and bonded, or a plate-shaped body woven of the fibers may be used. The copper alloy material used in the present invention includes Ni1.2 to 3.6 wt%, Si0.3 to 1.0 wt%, Be.
0.2-2.5 wt%, Ti0.2-4.5 wt%, Sn0.1-3.5
wt%, Co0.1 to 2.5 wt%, Zn0.1 to 5.0 wt%, Mg
A copper alloy material containing at least one of 0.05 to 0.5 wt% and the balance Cu and unavoidable impurities is preferable. The alloying element mainly has a function of maintaining strength and stress relaxation resistance to a high degree, and its concentration range is Ni1.2 to 3.6 wt%, S
i0.3-1.0 wt%, Be0.2-2.5 wt%, Ti0.2-4.
5 wt%, Sn0.1-3.5 wt%, Co0.1-2.5 wt%, Z
The reason for limiting n0.1 to 5.0 wt% and Mg0.05 to 0.5 wt% is that when the concentration of each alloying element exceeds the upper limit of the limiting range, casting defects or This is because rolling defects occur and it becomes difficult to process the copper alloy material into a predetermined shape, and the environment resistance characteristics also deteriorate. Further, if the concentration of each of the alloying elements falls below the lower limit of the limited range, sufficient strength and stress relaxation resistance cannot be obtained. Furthermore, V, Zr,
One or two or more of Cr, Y and rare earth elements (MM) may be added in a total amount of about 0.005 to 0.2 wt% to refine the crystal grains and further improve the strength.

[0007]

The composite bending member for a damper of the present invention is a composite of a copper alloy material excellent in strength, stress relaxation resistance and environmental resistance, and aramid fiber or carbon fiber excellent in vibration fatigue resistance. All the characteristics required for the bending member for vehicle are satisfied.

[0008]

EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 Among the alloys shown in Table 1, alloy Nos. A to F were melted,
It was cast into an ingot, and this ingot was hot-rolled at 900 ° C to obtain a rolled material having a thickness of 10 mm. Next, after the surface of this rolled material was ground, it was processed into a plate material having a thickness of 0.6 mm by cold rolling. After that, this plate material is subjected to intermediate heat treatment at 850 ° C. for 60 seconds, rapidly cooled from the heat treatment temperature, pickled and polished, and then cold rolled to a plate material having a thickness of 0.35 mm. After the plate is heat-treated at 320-450 ℃ for 2 hours,
This was densely covered with aramid fiber or carbon fiber to a thickness of 0.2 mm, and was compounded in the form shown in FIG. The aramid fiber or the carbon fiber was compounded with the copper alloy plate material by a warm pressure bonding method using an adhesive. Also, high-strength para-aramid fiber Technora (trade name) manufactured by Teijin Ltd. was used as the aramid fiber, and PAN-based carbon fiber trading card (trade name) manufactured by Toray Co., Ltd. was used as the carbon fiber.

Comparative Example 1 Alloy No. 1 produced in Example 1 Copper alloy plate materials of thickness A and D having a thickness of 0.35 mm were used as they were as bending members for damper without compounding aramid fiber or carbon fiber. Comparative Example 2 Alloy No. shown in Table 1. The G to H copper alloys were processed into a 0.35 mm-thick copper alloy sheet by the same method and conditions as in Example 1, and then heat-treated at 320 to 450 ° C. for 2 hours, and then this copper alloy sheet was made of aramid. Fibers or carbon fibers were compounded in the form shown in FIG. 1A or B to fabricate a composite bending member for a damper. Conventional Example 1 Commercially available ordinary steel (SS-490) having a thickness of 0.35 mm and 8% phosphor bronze were used as the bending member for the damper.

Samples were cut out from the composite bending members for damper or the bending members for damper thus obtained, and the tensile strength, stress relaxation resistance, vibration fatigue resistance, and environment resistance were investigated. The results are shown in Table 2. The tensile test was performed according to JIS-Z2241. During the tensile test, a weak current was applied to the copper alloy member portion of the damper composite bending member, and it was determined whether or not the fracture site was the copper alloy member portion based on the presence or absence of energization at the time of fracture. For the stress relaxation resistance, a strip of 10 mm wide and 200 mm long was cut out from the test material, and this strip was bent at a load stress of 500 N / mm ² and held at 150 ° C for 500 hours. The amount of flexure remaining after release of the load stress was calculated as a percentage. For vibration fatigue resistance, a strip with a width of 10 mm and a length of 100 mm is cut out from the test material, the center part is bent 90 degrees with a curvature of 5 mm, one end is fixed and the other end has an amplitude of 30 m.
The test was performed by repeatedly applying bending vibration with m and a period of 0.1 second.
The maximum test time was 48 hours, and the time until breakage was shown.
For environmental resistance characteristics, use the same strips used in the vibration fatigue test as "hold for 15 minutes in salt spray of 10% NaCl → 100 at 40 ° C.
% Corrosion atmosphere for 30 minutes → 80 ° C. 30% RH atmosphere for 60 minutes ”, the corrosion cycle was repeated 30 times, and a vibration fatigue test was conducted under the same conditions as described above for evaluation.
However, the maximum test time was 24 hours.

[0011]

[Table 1]

[0012]

[Table 2] Type: Ara → Aramid fiber, Carbon → Carbon fiber, Form:
The form shown in FIG. Fracture site: Gold is the copper alloy member part.
○ indicates 48 hours or more. ○ indicates 24 hours or more.

As is clear from Table 2, the composite bending members for dampers (Nos. 1 to 8) of the present invention were tested in all test items of tensile strength, stress relaxation resistance, vibration fatigue resistance, and environment resistance. It showed good results. On the other hand, Comparative Examples Nos. 9 and 10 did not contain aramid fiber or carbon fiber, so that the vibration fatigue resistance and the environment resistance were deteriorated. Also No. In Nos. 11 and 12, the tensile strength, stress relaxation resistance, and environmental resistance were deteriorated because the alloy element concentration of the copper alloy material used was low. As for the vibration fatigue resistance, the composite effect of aramid fiber and carbon fiber was not recognized because the vibration fatigue resistance of the copper alloy itself deteriorated. Also No. For Nos. 13 and 14, because the alloying element concentration of the copper alloy material was too high, rolling defects occurred during the manufacturing process, and it was not possible to machine into plate materials with the prescribed shape. No. of conventional materials
In Nos. 15 and 16, strength, stress relaxation resistance, vibration fatigue resistance, and environment resistance were all low. When the damper composite bending member of the present invention was used to support a duct in a factory, it could be stably used for a long period of time without generating noise.

[0014]

[Effect] As described above, the composite bending member for a damper of the present invention is excellent in strength, stress relaxation resistance, vibration fatigue resistance, and environment resistance, and has a remarkable industrial effect.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing an example of a mode of a composite bending member for a damper of the present invention.

[Explanation of symbols]

 1 Copper alloy material 2 Aramid fiber

Claims (2)

[Claims] 1. A composite bending member for a damper, comprising a copper alloy material excellent in strength, stress relaxation resistance and environment resistance, and aramid fiber and / or carbon fiber being compounded. 2. The copper alloy material is Ni1.2 to 3.6 wt%, S
i0.3-1.0 wt%, Be0.2-2.5 wt%, Ti0.2-4.
5 wt%, Sn0.1-3.5 wt%, Co0.1-2.5 wt%, Z
n0.1-5.0 wt%, Mg0.05-0.5 wt% at least 1
The composite bending member for a damper according to claim 1, wherein the composite bending member includes a seed and the balance is Cu and unavoidable impurities.