Sound-absorbing cotton processing method, sound-absorbing cotton and wheel cover type sound-absorbing cotton

Abstract

The invention discloses a processing method of sound-absorbing cotton, the sound-absorbing cotton and wheel cover type sound-absorbing cotton, and relates to the technical field of automobile sound insulation and noise reduction, upper and lower molds matched with a to-be-mounted component in shape are used for processing, and the processing method comprises the following steps that S1, a low-gram-weight PET layer with a PE film on the lower surface is laid on the upper mold; the high-gram-weight PET layer with the PE film on the upper surface is laid on the lower mold; s2, carrying out upper and lower die assembly, compressing the low-gram-weight PET layer and the high-gram-weight PET layer, carrying out pressure-maintaining molding, and heating to melt a PE film between the low-gram-weight PET layer and the high-gram-weight PET layer to form a bonding layer; and S3, opening the mold and taking out the sound-absorbing cotton. The invention further discloses sound-absorbing cotton and wheel cover type sound-absorbing cotton processed and formed by the sound-absorbing cotton. According to the processing method of the sound-absorbing cotton, the sound-absorbing cotton and the wheel cover type sound-absorbing cotton, the sound-absorbing cotton and the wheel cover type sound-absorbing cotton have the sound insulation and sound absorption functions at the same time, processing is easy, and the weight is light.

Description

technical field [0001] The application relates to the technical field of sound insulation and noise reduction for automobiles, and in particular to a processing method of sound-absorbing cotton, sound-absorbing cotton and wheel cover-type sound-absorbing cotton. Background technique [0002] At present, vehicle NVH (Noise, Vibration, Harshness, noise, vibration and harshness) is an important indicator of vehicle comfort, and it is an area that major car manufacturers focus on improving. During the operation of the car, the main factors that generate noise are wind noise, tire noise, engine running noise, chassis and suspension vibration and so on. To isolate the above-mentioned noise, the body sheet metal of the whole vehicle plays a certain role in sound insulation; however, a considerable part of the noise will still be transmitted to the interior of the car. Therefore, in order to reduce the NVH of the vehicle, designers need to arrange sound-absorbing cotton in some pos...

AI Technical Summary

Problems solved by technology

[0004] However, the two-component sound-absorbing cotton of the first technical solution has the following disadvantages. The reduction of automobile noise is mainly divided into two steps. The first step is to isolate sound, and the second step is to absorb sound; , the effect of absorbing sound is good, but it cannot achieve the effect of isolating sound, and the overall effect of reducing noise is single

Two-component sound-absorbing cotton cannot be finalized due to structural limitations. It cannot be used in areas where parts of the car need to be profiled, and the application conditions are limited.

At the same time, the cost of two-component sound-absorbing cotton is high, and the cost performance is relatively low.

However, the composite material sound insulation pad of the second technical solution is heavy after the whole part is formed, and the weight of a single part can even exceed 10kg. It is difficult for online workers to pick up the parts and assemble them.

The part forming process is also relatively complicated, requiring two sets of molds, one set of molds is used for hot-press molding of EVA or POE (parts profiling), and the other set of molds is used to put the formed EVA or POE into the foaming mold and use PU to cast Foaming to form final parts, long processing cycle, large investment in molds, high cost of parts

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