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Micro porous metal plate making method and product

A metal plate and microporous technology, which is applied in metal processing and other directions, can solve the problems of narrow sound absorption frequency band, low absorption efficiency, and effort, and achieve the effect of narrow sound absorption frequency band, low sound absorption efficiency, and simple and easy processing method

Inactive Publication Date: 2004-01-28
北京绿创声学工程设计研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the field of noise control and building decoration sound-absorbing materials, the microporous sound-absorbing panels widely used have a micropore diameter greater than 0.5mm, and their sound-absorbing frequency band is narrow, the absorption efficiency is low, and the sound absorption coefficient exceeds the octave band of 0.5. Only about 1, or even smaller, in addition, because the existing micro-orifice plate can not change the hole diameter and hole spacing according to the actual use requirements to obtain the effect of broadband and high sound absorption
If it needs to be changed, the mold must be reprocessed, which is laborious and expensive

Method used

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  • Micro porous metal plate making method and product
  • Micro porous metal plate making method and product
  • Micro porous metal plate making method and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1. A stainless steel plate with a thickness of t=0.1 mm and a square of 200 mm×200 mm is processed by a chemical etching method. The stainless steel microporous sound-absorbing plate will be used in occasions such as indoor sound absorption and mufflers. For example, in order to reduce the noise in the range of 250Hz-1250Hz, the sound absorption coefficient of the sound-absorbing material in this frequency band is required to be higher than 0.5. For this reason, the aperture of the microporous plate is designed as d=0.1 mm, the hole spacing b=1 mm, and the perforation rate is 0.79%.

[0028] Process flow chart of microporous metal plate processing Figure 1 The specific implementation steps are as follows:

[0029] 1) According to the above-mentioned sound-absorbing requirements, the diameter of the micropores is designed to be equal to 0.1mm, the perforation rate is 0.79%, and the distance between the holes is 1mm (calculated according to the square arrange...

Embodiment 2

[0036] Embodiment 2. The cold-rolled thin steel plate with a thickness of 0.5mm and a square of 400mm×400mm is processed by chemical corrosion method, and the microporous sound-absorbing panel of the cold-rolled thin steel plate will be used in places such as indoor sound absorption and mufflers. For example: Indoor sound absorption requires that the sound absorption number in the range of 250Hz-1000Hz is not less than 0.4. To do this, take the following steps:

[0037] 1) According to the above sound-absorbing requirements, the designed microholes are square holes with a side length equal to 0.4mm, a perforation rate of 1.03%, and a distance between holes of 3.5mm (calculated according to a square arrangement). According to this, the computer can be used Draw the microhole layout and print the microhole pattern on the printing screen;

[0038] 2) Clean the steel plate to be processed in a washing machine to remove oil and dust on the surface;

[0039] 3) Use resist ink to p...

Embodiment 3

[0043] Embodiment 3. In order to obtain a better sound absorption effect for the single-layer microporous structure, the absorption frequency band of the microporous plate must be widened. For example: the noise in the room of rotating power equipment is dominated by medium and low frequencies. In order to make the indoor reverberation time within the range of 125Hz-1250Hz not exceed 7 seconds, the sound absorption coefficient within the frequency bandwidth of 125Hz-1250Hz is required to be no less than 0.4. For this reason, it is necessary to process micropores with different pore diameters on the same microporous plate, such as image 3 As shown, in this embodiment, two types of micropores 1 with different diameters are processed on the same 400 mm×400 mm square cold-rolled steel plate 2 to achieve the effect of widening the absorption frequency band. Implementation steps:

[0044] 1) Take steel plate 2 thick t=0.3mm, high frequency resonance (f 0 = 500Hz, α max = 1) the...

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Abstract

The present invention relates to a method for producing microporous metal plate and its product, belonging to the field of utilizing microporous plate technology to control noise pollution. In said invention chemically corrosion method is used to produce microporous metal plate, can product lots of metal microporous plates whose pore size is 0.4mm-0.1mm and perforating rate is in the range of 10.01%-0.06% and the pore size and pitch of pores can be regulated according to the requirement. Said invented production method is simple and easy to implement, its cost is low, and its microporous plate possesses good sound-absorbing effect and wide sound-absorbing frequency band, so that it possesses extensive application field.

Description

Technical field: [0001] The invention belongs to the technical field of metal plate processing, in particular to the technical field of controlling noise pollution by using a micro-perforated plate. Background technique: [0002] So far, the production and processing of metal microporous plates at home and abroad mainly adopts the method of drilling, punching, and piercing holes. This method can only process metal microporous plates with a pore diameter of 0.5mm or more. For large-scale processing of metal plates below 0.4mm It is almost impossible to use laser technology to process microporous sound-absorbing panels with a diameter of less than 0.4mm, but the cost is very expensive and the processing time is long, so it cannot be widely used. In addition, due to the limitation of the mold used in the traditional microporous plate processing method, the hole diameter and hole spacing are basically fixed and difficult to adjust, so the hole diameter and hole spacing cannot be...

Claims

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Application Information

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IPC IPC(8): B26F1/00B26F3/00
Inventor 谢威张斌丁辉
Owner 北京绿创声学工程设计研究院有限公司
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