CN115312018A - A kind of bridge acoustic wrapping and integral molding processing method - Google Patents

Abstract

The embodiment of the invention discloses a bridge acoustic wrapping and integrated forming processing method. According to the bridge acoustic package, the motor part, the speed reducer part and the electric control unit part are integrally designed, and the electric control unit part comprises the following components in sequence from top to bottom: first black flame-retardant nonwoven fabric, V ₀ A grade thermoplastic elastomer or a felt material mixed with polyester and preoxidized polyester fiber, LDPUR semi-open pore type light foaming and second black flame-retardant non-woven fabric. The acoustic package of the bridge can effectively solve the sound insulation problem of the bridge.

Description

Acoustic wrapping and integral molding processing method of electric bridge

technical field

The embodiments of the present invention relate to the technical field of vehicles, and in particular to an acoustic wrapping and integral molding processing method for an electric bridge.

Background technique

When the electric bridge is working on the car, it will emit order single-frequency noise, which is then transmitted to the car, and it is called air noise when it is transmitted to the car through the air transmission path. In order to improve the interior sound quality of the car and reduce the air noise radiated from the electric bridge to the interior of the car, at present, the form of adding the acoustic package of the electric bridge is often used to suppress the influence of the air noise generated by the electric bridge on the interior of the car. Like general sound insulation measures, the current bridge acoustic package is mostly separated, that is, the motor, reducer and high-voltage electronic control unit are separately packaged, and the package mainly includes a sound insulation layer and a sound absorption layer. This structure The sound insulation is not ideal.

Contents of the invention

An embodiment of the present invention provides an acoustic wrapping and integral molding processing method for an electric bridge, which can effectively solve the sound insulation problem of the electric bridge.

An embodiment of the present invention provides an electric bridge acoustic package, including: a motor part, a reducer part and an electronic control unit part;

The motor part, the reducer part and the electronic control unit part are designed in one piece, and from top to bottom are: the first black flame-retardant non-woven fabric, V ₀ grade thermoplastic elastomer or a mixture of polyester Felt of ester and pre-oxidized polyester fiber, LDPUR semi-open cell lightweight foam and second black flame-retardant non-woven fabric.

Adopting this technical solution can not only reduce the introduction of noise at the gap, but also match the characteristics of the four-layer material, so that the acoustic package of the bridge can better fit the bridge, and achieve better molding and sound insulation and sound absorption effects.

In a feasible solution, the second black flame-retardant non-woven fabric adopts a specification of 50-150 g/m ² and has a thickness of 0.5-1 mm.

This technical solution is adopted to make the bridge and the acoustic package of the bridge well flame-retardant, and to maintain a certain stability between the bridge and the second black flame-retardant non-woven fabric during long-term use , to avoid the failure of the inner layer of the second black flame-retardant non-woven fabric during long-term use, resulting in the overall failure of the entire bridge acoustic package.

In a feasible solution, the thermoplastic elastomer is a sheet material with a thickness of 1-5 mm extruded from TPU/EVA material.

This technical solution is adopted to provide good sound insulation and mechanical properties after deformation while ensuring flame retardancy, and after deformation, the first black flame-retardant non-woven fabric and the second flame-retardant non-woven fabric can be better bonded On the outside of the bridge; if the size is too large, the first black flame-retardant non-woven fabric is prone to deformation after lamination, is easy to tear or will be lifted after long-term use; if the size is too small, the sound insulation effect is not good, and It is not easy to keep the shape after fitting.

In a feasible solution, the density of the LDPUR semi-open-cell lightweight foam is 8-20 kg/m ³ and the thickness is 5-25 mm.

This technical solution is adopted to ensure a good sound-absorbing effect, and at the same time make it cooperate with thermoplastic elastomers, so that the service life of the bridge acoustic package is longer.

In a feasible solution, the felt material mixed with polyester and pre-oxidized polyester fiber is a black hard layer felt with an area density of 800-1500 g/m ² and a thickness of 1-5 mm.

The purpose of adopting this technical solution is to improve the anti-wear ability while ensuring a certain flame-retardant effect, so as to prolong the service life.

The present invention also provides an integral molding processing method for bridge acoustic wrapping, comprising the following steps:

S1. Lay the first black flame-retardant non-woven fabric, V ₀ grade thermoplastic elastomer or felt mixed with polyester and pre-oxidized polyester fiber, and then laminate and bond them together after heating at 130-200°C. Form the upper layer sheet; after superimposing the LDPUR semi-open-cell lightweight foam and the second black flame-retardant non-woven fabric, they are laminated and bonded together after heating at 130-200°C to form the lower layer sheet;

S2. Place the upper layer sheet in the lower mold, cool the setting temperature to 0-20°C, and stick it on the inner side of the lower mold of the forming mold;

S3, placing the lower sheet in the upper mold, and raising the temperature to 180-230°C;

S4. Using a pressure of 180 to 300 tons, press and form the upper sheet and the lower sheet in the upper mold and the lower mold respectively, and hold for 30 seconds;

S5. Place the upper sheet, the formed parts, and the lower sheet in sequence in the shearing mold, heat up to 80-85°C, press them together, and place the required holes and surrounding waste at one time Die cut to remove.

By adopting this technical solution, a good integrated molding effect can be obtained, and at the same time, the second black flame-retardant non-woven fabric can maintain a certain stiffness, so as to avoid lifting after long-term use, which affects the service life. At the same time, due to the treatment method of cooling first and then heating and pressing, it can improve the anti-deformation and anti-wear capabilities of the outermost layer while ensuring the sound insulation and sound absorption effects.

In a feasible solution, step S1 specifically includes:

S101, brushing a layer of adhesive on the outside of the thermoplastic elastomer of _V0 grade;

S102. Paste the first black flame-retardant non-woven fabric on the outside of the thermoplastic elastomer of V ₀ grade.

The adoption of this technical solution is to increase the adhesive to achieve the effect of auxiliary shaping, and at the same time make the bonding between the layers more firm, and the sound insulation and sound absorption effects are better.

In a feasible solution, step S1 specifically includes:

S111. Heat the inner side of the first black flame-retardant non-woven fabric to 180±5°C, and the outer temperature must not exceed 130°C;

S112. Attach the high-temperature side of the first black flame-retardant non-woven fabric to the outside of the thermoplastic elastomer of V ₀ grade, and drive out the gas to make it closely adhere.

In this technical solution, the first black flame-retardant non-woven fabric and the thermoplastic elastomer are laminated by hot pressing, on the one hand to improve the firmness of the combination between the two, on the other hand In order to make the transmission resistance of noise between the two higher.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a partial cross-sectional view of the bridge acoustic package in Embodiment 1 of the present invention;

Fig. 2 is the view after forming of the bridge acoustic package in Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of the assembly relationship between the bridge acoustic package and the bridge in Embodiment 1 of the present invention;

Fig. 4 is a flow chart of the integral molding processing method of the bridge acoustic package in the third embodiment of the present invention.

Labels in the figure:

1. The first black flame-retardant non-woven fabric; 2. V ₀ grade thermoplastic elastomer; 3. LDPUR semi-open-cell lightweight foam; 4. The second black flame-retardant non-woven fabric.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", and "circumferential" are based on the drawings The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the scope of the present invention. limit.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , can also be integrated; it can be mechanical connection, electrical connection, or communication connection; it can be direct connection or indirect connection through an intermediary, it can be the internal communication of two components or two components interactions, unless otherwise expressly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations. The technical solution of the present invention will be described in detail below with specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

The electric bridge is the collective name of the motor, reducer and high-voltage electronic control unit. All three will generate noise on the car, which will be transmitted to the interior of the car to form air noise. The air noise in the car greatly affects the sound quality in the car. In order to eliminate this part of air noise, the three sub-components are usually wrapped separately, and the sound insulation materials used are mostly simple sound insulation layer and sound absorption layer. The sound insulation effect of this structure is not very ideal at present.

Embodiment one

Fig. 1 is a partial cross-sectional view of the bridge acoustic package in Embodiment 1 of the present invention, Fig. 2 is a view after molding of the bridge acoustic package in Embodiment 1 of the present invention, and Fig. 3 is a view of the bridge acoustic package in Embodiment 1 of the present invention and Schematic diagram of the assembly relationship of the bridge.

As shown in Figures 1 to 3, the bridge acoustic package provided by the embodiment of the present invention includes: a motor part, a reducer part and an electronic control unit part.

The motor part, the reducer part and the electronic control unit part are designed in one piece, and from top to bottom are: the first black flame-retardant non-woven fabric 1, V ₀ grade thermoplastic elastomer 2, LDPUR semi-open hole Type lightweight foam 3 and second black flame retardant non-woven fabric 4.

As shown in Figure 1, it is a partial cross-sectional view of the acoustic package of the bridge. It can be seen that the acoustic package of the bridge uses four layers of materials, among which, the black flame-retardant non-woven fabrics on the upper and lower sides are V ₀ grades respectively. Thermoplastic elastomer 2 and LDPUR semi-open cell lightweight foam 3.

At the same time, since the acoustic package of the bridge is integrated, the motor, reducer and electronic control unit are all packaged in the acoustic package of the bridge. On the one hand, this is to reduce the noise transmitted from the gap when using a separate package. On the other hand, it is to cooperate with the material structure to realize the shaping effect of the acoustic package of the bridge and the sound insulation and sound absorption effect.

It should be noted that the main function of the thermoplastic elastomer 2 of V ₀ level is sound insulation, the main function of the first black flame-retardant non-woven fabric 1 and the second black non-woven fabric 4 is sound-absorbing and flame-retardant, LDPUR semi-open cell type The main function of lightweight foam 3 is sound absorption. The first black flame-retardant non-woven fabric 1 and the second black flame-retardant non-woven fabric 4 are arranged on the inside and outside, together with V ₀ -level thermoplastic elastomer 2 and LDPUR semi-open-cell lightweight Quality foaming 3, to cooperate with each other for shaping, and in the process of use after shaping, due to the characteristics of the material properties, the acoustic wrapping of the bridge is better wrapped on the bridge, and it is not easy to fall off.

Adopting this technical solution can not only reduce the introduction of noise at the gap, but also match the characteristics of the four-layer material, so that the acoustic package of the bridge can better fit the bridge, and achieve better molding and sound insulation and sound absorption effects.

Optionally, in the bridge acoustic package provided by the embodiment of the present invention, the second black flame-retardant non-woven fabric has a specification of 50-150 g/m ² and a thickness of 0.5-1 mm.

This technical solution is adopted to make the bridge and the acoustic package of the bridge well flame-retardant, and to maintain a certain stability between the bridge and the second black flame-retardant non-woven fabric during long-term use , to avoid the failure of the inner layer of the second black flame-retardant non-woven fabric during long-term use, resulting in the overall failure of the entire bridge acoustic package.

Optionally, in the bridge acoustic package provided by the embodiment of the present invention, the thermoplastic elastomer with V ₀ flame retardancy is a sheet material with a thickness of 1-5 mm extruded from TPU/EVA material.

The purpose of this technical solution is to provide good sound insulation and improve the mechanical properties after deformation while ensuring flame retardancy; sound insulation can reduce noise, and after deformation, the first black flame-retardant non-woven fabric and the second The flame-retardant non-woven fabric is better attached to the outside of the bridge; if the size is too large, the first black flame-retardant non-woven fabric is prone to deformation after lamination, and it is easy to tear or will be lifted after long-term use; if the size is too large If it is small, the sound insulation effect is not good, and it is not easy to maintain the shape after bonding.

Optionally, for the bridge acoustic package provided by the embodiment of the present invention, LDPUR semi-open-cell lightweight foam is selected with a density of 8-20 kg/m ³ and a thickness of 5-25 mm. Preferably, it is 13kg/m ³ , and the thickness is 11-12mm.

This technical solution is adopted to ensure a good sound-absorbing effect, and at the same time make it cooperate with thermoplastic elastomers, so that the service life of the bridge acoustic package is longer.

Embodiment two

The embodiment of the present invention also provides an electric bridge acoustic package. On the basis of the first embodiment, the first black flame-retardant non-woven fabric, the felt material mixed with polyester and pre-oxidized polyester fiber, LDPUR semi-open cell lightweight foam and second black flame retardant nonwoven fabric.

The felt material mixed with polyester and pre-oxidized polyester fiber is used to replace the thermoplastic elastomer of V ₀ grade, and the felt material mixed with polyester and pre-oxidized polyester fiber adopts a black hard layer with an area density of 800-1500g/ ^m2 Felt, and the thickness is 1-5mm. It is preferably 1250g/m ² , a felt material mixed with polyester and pre-oxidized polyester fibers with a thickness of 3.5-3.7mm.

This technical solution is adopted, in order to ensure a certain flame retardant effect, improve the wear resistance and prolong the service life; at the same time, the mechanical performance of the acoustic package of the bridge is higher, and the sound insulation effect is slightly lower than that of the original solution. There is improvement, and it is not easy to age.

Embodiment Three

Fig. 4 is a flow chart of the integral molding processing method of the bridge acoustic package in the third embodiment of the present invention. As shown in Figure 2, Embodiment 3 of the present invention provides an integral molding processing method for bridge acoustic wrapping, including the following steps:

S1. First form the upper sheet, stack the first black flame-retardant non-woven fabric, V ₀ grade thermoplastic elastomer or felt mixed with polyester and pre-oxidized polyester fiber, and cover it after heating at 130-200°C glued together. At the same time, the lower layer sheet is formed; after the LDPUR semi-open-cell lightweight foam and the second black flame-retardant non-woven fabric are stacked, they are laminated and bonded together after heating at 130-200°C to form the lower layer sheet .

S2. Place the upper layer sheet in the lower mold, cool to a setting temperature of 0-20° C., and stick it on the inner side of the lower mold of the forming mold.

One possible cooling method is: liquid nitrogen spray cooling.

S3, placing the lower sheet in the upper mold, and raising the temperature to 180-230°C. The heating method may be infrared heating.

S4. Using a pressure of 180-300 tons, press and form the upper layer sheet and the lower layer sheet in the upper mold and the lower mold respectively, and hold for 30 seconds.

S4. Place the upper sheet, formed parts, and lower sheet in the shearing die in sequence, heat up to 80-85°C, press them together, and punch out the required holes and surrounding waste materials at one time.

By adopting this technical solution, a good integrated molding effect can be obtained, and at the same time, the second black flame-retardant non-woven fabric can maintain a certain stiffness, so as to avoid lifting after long-term use, which affects the service life. At the same time, due to the treatment method of cooling first and then heating and pressing, it can improve the anti-deformation and anti-wear capabilities of the outermost layer while ensuring the sound insulation and sound absorption effects.

Optionally, in the integral molding processing method of the bridge acoustic package provided in Embodiment 3 of the present invention, step S1 specifically includes:

S101. Brush a layer of adhesive on the outside of the thermoplastic elastomer of grade _V0 .

At present, there are many adhesives for bonding thermoplastic elastomers to black flame-retardant non-woven fabrics, which need to be determined in accordance with the specific physical properties of thermoplastic elastomers, and all of them belong to the prior art.

S102. Paste the first black flame-retardant non-woven fabric on the outside of the _V0 grade thermoplastic elastomer.

The adoption of this technical solution is to increase the adhesive to achieve the effect of auxiliary shaping, and at the same time make the bonding between the layers more firm, and the sound insulation and sound absorption effects are better.

Optionally, in the integral molding processing method of the bridge acoustic package provided in Embodiment 2 of the present invention, step S1 specifically includes:

S111. Heat the inside of the first black flame-retardant non-woven fabric to 180±5° C., and the outside temperature must not exceed 130° C.

S112. Attach the high-temperature side of the first black flame-retardant non-woven fabric to the outside of the thermoplastic elastomer of V ₀ grade, and drive out the gas to make it closely adhere.

In this technical solution, the first black flame-retardant non-woven fabric and the thermoplastic elastomer are laminated by hot pressing, on the one hand to improve the firmness of the combination between the two, on the other hand In order to make the transmission resistance of noise between the two higher.

In the present invention, unless otherwise clearly specified and limited, a first feature may be "on" or "under" a second feature in that the first feature and the second feature are in direct contact, or the first feature and the second feature pass through the middle. Media indirect contact.

Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

In the description of this specification, reference to the description of the terms "one embodiment", "some embodiments", "example", "specific examples" or "some examples" means that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (8)

1. A bridge acoustic package, comprising: the electric motor part, the speed reducer part and the electric control unit part;

the motor part the reduction gear part with the design of electrical control unit part formula as an organic whole, and from last down do in proper order: first black flame-retardant nonwoven fabric, V ₀ A grade flame-retardant thermoplastic elastomer or a felt material mixed with polyester and pre-oxidized polyester fiber, LDPUR semi-open-hole type light foaming and a second black flame-retardant non-woven fabric.

2. The acoustic bridge enclosure of claim 1 wherein the second black flame retardant nonwoven fabric comprises a caliper from 0.5 to 1mm in a range from 50 to 150 grams per square meter.

3. The bridge acoustic package of claim 2, wherein the thermoplastic elastomer is a sheet extruded from a TPU/EVA alloy and has a thickness of 1-5 mm.

4. The acoustic bridge pack of claim 3, wherein the LDPUR semi-open cell lightweight foam has a density of 8 to 20kg/m ³ And the thickness is 5-25 mm.

5. The acoustic bridge package of claim 4, wherein the felt material mixed with polyester and pre-oxidized polyester fibers has an areal density of 800-1500 g/m ² The black hard layer felt has a thickness of 1-5 mm.

6. An integrated forming processing method for bridge acoustic packaging is characterized by comprising the following steps:

s1, mixing the first black flame-retardant non-woven fabric and V ₀ Thermoplastic elastomers of the classSuperposing felt materials mixed with polyester and pre-oxidized polyester fibers, heating at 130-200 ℃, and laminating and bonding together to form an upper layer sheet; after the LDPUR semi-open pore type light foaming and the second black flame-retardant non-woven fabric are overlapped, the LDPUR semi-open pore type light foaming and the second black flame-retardant non-woven fabric are heated at 130-200 ℃ and then are combined and bonded together to form a lower layer sheet;

s2, placing the upper layer sheet into a lower die, cooling to a setting temperature of 0-20 ℃, and attaching the upper layer sheet to the inner side of the lower die of a forming die;

s3, placing the lower-layer sheet in an upper die, and heating to 180-230 ℃;

s4, respectively pressing and molding the upper layer sheet and the lower layer sheet on an upper die and a lower die at a pressure of 180-300 tons, and keeping for 30 seconds;

and S5, sequentially placing the upper layer sheet, the formed part and the lower layer sheet in a shearing die, heating to 80-85 ℃, pressing together, and punching and removing the required holes and peripheral waste materials at one time.

7. The integrated molding processing method according to claim 6, wherein the step S1 specifically comprises:

s101 at V ₀ Brushing a layer of adhesive on the outer side of the thermoplastic elastomer;

s102, sticking the first black flame-retardant non-woven fabric on the V ₀ An outer side of said thermoplastic elastomer of the stage.

8. The integrated forming processing method according to claim 6, wherein the step S1 specifically comprises:

s111, heating the inner side of the first black flame-retardant non-woven fabric to 180 +/-5 ℃, wherein the outer side temperature is not more than 130 ℃;

s112, sticking the high-temperature side of the first black flame-retardant non-woven fabric to V ₀ And the outer side of the thermoplastic elastomer is pressed out to drive gas out so as to make the thermoplastic elastomer tightly fit.

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