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Preparation device for sound absorbing sample and preparation method thereof

A technology for preparing devices and samples, applied in the field of sound-absorbing sample preparation, can solve problems such as gaps in test results, performance advantages and disadvantages, and impact on sound-absorbing test data results.

Inactive Publication Date: 2019-03-29
镇江立达纤维工业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now the more advanced the car, the manufacturer will find a way to make the noise inside the car as low as possible when driving, which is the NVH performance often mentioned in the automotive field.
The quality of NVH performance is an important detection index in the whole vehicle. It is imperative to improve the NVH performance. At present, various noise reduction and heat insulation pads must be equipped in motor vehicles to effectively reduce noise pollution. How to identify the noise reduction effect? Can only be detected by standard methods
[0003] In order to test the quality of noise reduction materials, the reverberation method is commonly used for testing (GB / T 20247-2006 or 7414Z-SNA-0000). The reverberation method has requirements for the production of samples, especially the density and thickness should be consistent with each The material specifications are consistent. Therefore, in order to ensure the accuracy of the test results, the production of test samples of the tested material should meet the requirements of the standard, and the resin semi-cured base material is the basis for making engine compartment and cover heat insulation pads. Material, the existing detection method is to directly make the semi-cured resin material into the size, thickness and density of the test sample, and then iron the non-woven fabric with PE powder on the back with an electric iron and other tools. At this time, the resin in the material is still The semi-cured state is different from the state of the actual finished product (resin curing), so there is actually a gap in the test results, and there is an error in the thickness of each test sample, which will also affect the data results of the sound absorption test

Method used

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  • Preparation device for sound absorbing sample and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Test sample requirements:

[0042] Substrate: thickness: 15±1mm, surface density: 1000g / m 2 ±50g / m 2

[0043] Size: 1005×1010mm

[0044] Fabric: black non-woven fabric (with PE powder on the back) 100g / m 2

[0045] 4.1 Install the upper and lower plates in the four-column forming hydraulic press, connect the power supply, and adjust the temperature;

[0046] 4.2 Place four limit blocks with a thickness of 15mm respectively within 20mm from the edge of the lower plate to form a rectangular frame;

[0047] 4.3 Set the process parameters:

[0048] The four heating zones on the upper plate are at 160°C, the four heating zones on the lower plate are at 200°C, the hot-pressing time is 80S, and the hot-pressing pressure is 40MPa.

[0049] 4.4 will be 100g / m 2 Black non-woven fabric is laid flat at 1000g / m 2 Put the resin semi-cured felt on the center of the lower plate together, start the button to press, and check whether the thickness of the material meets the requi...

Embodiment 2

[0053] Test sample requirements:

[0054] Substrate: thickness: 10±1mm, surface density: 700g / m 2 ±50g / m 2

[0055] Size: 1005×1010mm

[0056] Fabric: black non-woven fabric (with PE powder on the back) 80g / m 2

[0057] 5.1 Install the upper and lower plates in the four-column forming hydraulic press, connect the power supply, and adjust the temperature;

[0058]5.2 Place four limit blocks with a thickness of 10mm respectively within 20mm from the edge of the lower plate to form a rectangular frame;

[0059] 5.3 Set the process parameters:

[0060] The four heating zones on the upper plate are at 160°C, the four heating zones on the lower plate are at 180°C, the hot-pressing time is 60S, and the hot-pressing pressure is 30MPa.

[0061] 5.4 will be 80g / m 2 The black non-woven fabric is laid flat on the 700g / m2 resin semi-cured felt, and then placed in the center of the lower plate, the button is activated to press, and the thickness of the material is checked from the c...

Embodiment 3

[0065] Test sample requirements:

[0066] Substrate: thickness: 30±1mm, surface density: 1600g / m 2 ±80g / m 2

[0067] Size: 1005×1010mm

[0068] Fabric: black non-woven fabric (with PE powder on the back) 180g / m 2

[0069] 6.1 Install the upper and lower plates in the four-column forming hydraulic press, connect the power supply, and adjust the temperature;

[0070] 6.2 Place four limit blocks with a thickness of 30mm respectively within 20mm from the edge of the lower plate to form a rectangular frame;

[0071] 6.3 Set the process parameters:

[0072] The four heating zones on the upper plate are at 190°C, the four heating zones on the lower plate are at 220°C, the hot-pressing time is 100S, and the hot-pressing pressure is 50MPa.

[0073] 6.4 will be 180g / m 2 The black non-woven fabric is laid flat on the 1600g / m2 resin semi-cured felt, and then placed in the center of the lower plate, the button is started to press, and the thickness of the material is checked from t...

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Abstract

The invention discloses a preparation device for a sound absorbing sample and a preparation method thereof. The preparation device comprises a hydraulic machine, an upper plate, a lower plate and a limiting device, the upper plate and the lower plate are internally provided with heating components, the limiting device is located around the lower plate for defining the sample hydraulic thickness limit. The invention provides a sound absorbing sample which is consistent with the actual use state and has the same preparation quality to significantly improve the reliability and accuracy of the sound absorbing sample detecting structure.

Description

technical field [0001] The invention relates to a preparation device and method for a sound-absorbing sample for testing the sound-absorbing coefficient of a resin semi-cured noise-reducing material used in a motor vehicle using the reverberation method (GB / T20247-2006 or 7414Z-SNA-0000), which belongs to the sound-absorbing sample Parts preparation technology field. Background technique [0002] With the progress of the times, cars have entered the homes of ordinary people as a very convenient means of transportation, and the most intuitive reflection of the quality of cars is the comfort when driving. The level of noise emitted by a car during driving seriously affects the driver's experience, so in order to improve the driver's experience, the improvement of the noise inside the car is the general trend. Now the more advanced the car, the manufacturer will find a way to make the noise inside the car as low as possible when driving, which is the NVH performance that is of...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/36G01B21/08
CPCG01B21/08G01N1/286G01N1/36G01N2001/366
Inventor 李强刘晨程永强
Owner 镇江立达纤维工业有限责任公司
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