JPS601938B2 - Zn alloy for audio parts with excellent vibration absorption performance and high strength - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has excellent vibration absorption performance and high strength, and is particularly applicable to various audio components such as electric motor boards, turntables, insulator arm boards, turntable seats, stabilizers, head shells, Cartridges, deck transformers, speaker boxes,
This invention also relates to Zn alloys used in the manufacture of support parts for vibration generating equipment, such as the same frames.

Generally, audio equipment generates vibrations inside and outside of it, but if left unchecked, this vibration will have a negative effect on sound recording and playback, making it difficult to capture the original clear and true sound. Therefore, materials with excellent vibration absorption performance are used to manufacture the supporting parts of the above-mentioned vibration generating equipment. Currently, this material with excellent vibration absorption performance has a composition (hereinafter referred to as %
(denotation means weight %) Zn alloys having
Although this conventional Zn alloy has been widely used in practical use, it is currently unable to sufficiently respond to the recent changes in design flexibility and weight reduction due to its inferior strength. Therefore, from the above-mentioned viewpoint, the present inventors focused on the above-mentioned conventional Zn alloy, and conducted research to add high strength to this Zn alloy without impairing its excellent vibration absorption performance. As a result, Cu: 0.001-1.0% and Mg: 0.001 were added to the Zn alloy containing AI: 20-24%.
When one or two of these Zn alloys are contained in an amount of 0.1%, the strength of the Zn alloy is significantly improved without impairing the excellent vibration absorption performance of the Zn alloy. When used in the manufacture of support parts for vibration generators in audio components, it exhibits excellent performance.
They also discovered that their high strength makes it possible to reduce the weight, and also significantly expands the range of design tolerances that were previously restricted by mechanical strength.

This invention was made based on the above knowledge, and the reason why the component composition was limited as described above will be explained below.

{a) AI The AI component has the effect of uniformly dispersing in the Zn matrix and refining the Zn crystal grains, ensuring excellent vibration absorption performance and plastic workability, and improving strength. If the amount is less than 20%, the desired Zn crystal grain refinement cannot be achieved;
On the other hand, if the content exceeds 24%, the alloy will form arms and the plastic workability will deteriorate, so the content should be reduced to 20%.
It was set at ~24%.

{b) Cu and Mg These components have the ability to further improve the strength of the alloy and improve plastic workability, in addition to the strength-improving effect of AI, without impairing the vibration absorption performance provided by Zn and AI. Although there is an equivalent effect, Cu: 0.
If the content is less than 0.001% and Mg: less than 0.001%, the desired effect cannot be obtained in the above action, while Cu: 1.0%
and Mg: If the content exceeds 0.1%,
Since plastic workability and vibration absorption performance deteriorate, the content of each is set to Cu: 0.001 to 1.
0%, Mg: 0.001 to 0.1%.

Next, the Zn alloy of the present invention will be explained using examples and comparing with comparative examples. Example Using a high-frequency induction furnace, each of the first
A molten Zn alloy having the composition shown in the table was prepared, and a molten Zn alloy was prepared using a semi-continuous casting method.
After making an ingot with the size of 00 willow, temperature: 28
Zn alloys 1 to 9 of the present invention and comparative Zn alloys 1 to 8 were prepared by hot rolling at a temperature of 0.000 to obtain a hot rolled plate with a thickness of 5 mm, and then rapidly cooling the hot rolled plate after hot rolling. Manufactured.

Next, a test piece with dimensions of diameter: 50 mm x length: 50 mm was cut from the resulting Zn alloy, and one end of this test piece was used as an input end, and the other end was used as an output device. , the constant excitation force applied to this input end becomes 9 at the output end.
The vibration absorption performance is evaluated by measuring the time required for the vibration to decrease to 0%, and if this time is within 25/100 sand, it is rated A, and if the current sand is 25/1000 to 50/100, it is rated B. In addition, cases where sand of 50/100 or more was required were rated C.

This measurement was carried out using an acceleration pickup as shown in Table 1, based on the vibration drawn on an oscilloscope.

The tensile properties of the Zn alloy were also measured. These measurement results are summarized in Table 1. From the results shown in Table 1, Zn alloys 1 to 9 of the present invention all have excellent vibration absorption performance and high strength, while
If the content of any of the constituent components (indicated by * in Table 1) falls outside the scope of this invention, as seen in Comparative Zn Alloys 1 to 8, out of these two properties, It is clear that one or both of them will be inferior.

As mentioned above, the Zn alloy of the present invention has excellent vibration absorption performance, so it is suitable for use in manufacturing audio parts, especially support parts for vibration generating equipment such as the above, and has high strength and good properties. Because it has good plastic workability, it has industrially useful properties such as making it possible to reduce the weight of these supporting parts and to allow for freedom in design.

Claims (1)

[Claims] 1 Contains Al: 20 to 24% and further Cu: 0.0
01 to 1.0% and Mg: 0.001 to 0.1%, and the remainder is Zn and unavoidable impurities (weight %). Zn alloy for audio parts with excellent vibration absorption performance and high strength.