JP2001280415A - Vibration control and noise insulation structure, and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control and noise insulation structure that has high effect for vibration control and noise insulation, a lightweight (thin type), good stiffness and durability, and an easy manufacturing, and provide its manufacturing method. SOLUTION: The vibration control and noise insulation structure comprises the resin-molded body 12 including blind hollows 11, and the vibration control and noise insulation material 15. Also, after filling the material into blind hollows 11, the structure seals the openings 13 of the resin body 12. The material 15, whose density is larger than that of the resin body 12, is solid and/or fluid. The manufacturing method of the structure is that the material 15 is filled by vacuuming the hollows inside. The manufacturing method of the structure is that the material 15 is filled by pressurizing the material 15. After the material 15 is filled, the openings 18 are sealed by heating the resin formed to the opening shape, or by the friction welding of the openings 13 with resin pieces. The openings 13 are sealed by the pressure compressing or the heating compressing of a vibration control material encapsulating the openings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a building, an automobile,
The present invention relates to a vibration-damping and sound-insulating structure used for vibration-damping and sound-insulating of railway vehicles, ships, industrial equipment, and the like, and a method of manufacturing the same. The present invention also relates to a vibration-damping and sound-insulating structure in which the above-mentioned blind sound-insulating material is filled in the blind cavity, and a method for manufacturing the same. The vibration-damping and sound-insulating structure of the present invention has high vibration-damping (vibration-isolating) and sound-insulating properties, is lightweight, has good rigidity, etc., and particularly when used in an automobile, reduces noise and vibration of the engine. This is preferable because propagation or propagation inside or outside the vehicle can be prevented and a quiet automobile and a comfortable interior environment can be maintained even during traveling.

[0002]

2. Description of the Related Art Various types of vibration damping materials and sound insulating materials have been developed and used. However, with recent advances in technology, these vibration damping and sound insulating materials have become more sophisticated. Things are desired. Here, the vibration damping material is a material that absorbs vibration energy that has propagated through a solid, partially eliminates it as heat energy due to frictional resistance or the like, and reduces noise generated by vibration.
On the other hand, the sound insulating material is a material that is effective for reducing the sound (airborne sound) that noise propagates through the air. For example, it is effective to prevent or reduce the noise generated from the engine of the vehicle from propagating in the air and transmitted to the passenger compartment.

[0003] The above-mentioned vibration damping material and sound insulating material are prepared by mixing mica, foil (such as aluminum foil) or lead fiber with synthetic rubber or synthetic resin and molding the mixture into a sheet, or by applying it to a metal plate such as a steel plate. There are known asphalt and synthetic rubber used as well as a sandwich-like steel plate in which a viscoelastic substance such as a synthetic resin is sandwiched between two metal plates.

[0004] For example, Japanese Patent Publication No. 4-23141 discloses a resin-inorganic composite vibration damping material in which a needle-like crystalline inorganic substance (zonolite, potassium titanate) is blended with a polyvinyl chloride resin. Also, Japanese Patent Publication No. 54-8497
Japanese Patent Laid-Open Publication No. H11-157, discloses a heat-resistant vibration damping composition in which a scaly inorganic filler (mica) is blended with a thermosetting resin, a rubber-like substance, or a thermoplastic resin. Furthermore, Japanese Patent Application No. Hei 2-19405
Japanese Patent Publication No. 7 discloses a sheet-like lightweight vibration damping material in which a hollow filler (glass balloon, shirasu balloon, etc.) and surface-treated calcium carbonate are blended into asphalt.

[0005] In particular, as the vibration damping material and the sound insulating material, asphalt-based materials and rubber-based materials are often used, and are used in various fields. However, although these materials are inexpensive, they have a low damping / sound insulation effect, and when trying to increase the damping / sound insulation ability, they become thicker and heavier. There was a problem of conversion. In addition, since the material itself has no rigidity and needs to be reinforced with a steel plate or a resin component, there is a problem of providing rigidity.

For example, a high-strength and ultra-light honeycomb structure is used as a vibration damping material and a sound insulating material in aircraft and various other fields, but there is a problem that vibration is easily generated. As a measure to prevent the vibration, asphalt is applied to the side surface of the honeycomb structure, rubber is attached, or a steel plate is attached. But,
Since the effect of preventing vibration is small and the characteristics of the honeycomb structure such as light weight cannot be fully utilized, there has been a problem of increasing the vibration damping effect and reducing the weight. In addition, since many steps such as lamination and heating are required for manufacturing a honeycomb structure, and the laminated portion of the obtained structure is easily peeled off, there is a problem that the steps are simplified, rigidity and durability are imparted. there were.

On the other hand, resin components are often used in vibration damping materials and sound insulation materials installed around the engine of an automobile in order to reduce weight and shorten the manufacturing process for improving fuel efficiency. Since noise easily leaks into the passenger compartment and silence is reduced, foamed resin materials and fibers are laminated on the resin portion to provide a vibration damping and sound insulation effect. However, since the obtained vibration damping and sound insulation effects are small, and the number of processing steps is large and the parts are thick, there have been problems of improving the sound insulation effect, simplifying the processing steps, and reducing the weight (thinning).

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the purpose of the present invention is to have a high vibration suppression and sound insulation effect, to be lightweight (thin-walled), to have rigidity, An object of the present invention is to provide a vibration-damping and sound-insulating structure that has good durability and is easy to manufacture, and a method for manufacturing the same.

[0009]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, filling the blind cavity of the resin molded body with a predetermined vibration-damping and sound-insulating material has resulted in the problems described above. Have been solved, and the present invention has been completed.

[0010] That is, the vibration damping and sound insulating structure of the present invention has a resin molded body including a plurality of independent blind cavities having an opening on the front surface and extending in the rear direction, and a vibration damping and sound insulating material. A vibration-insulation structure, wherein the density of the vibration-damping and sound-insulating material is higher than the density of the resin molded body, and the vibration-damping and sound-insulating material is filled in the blind cavity, and the opening is sealed. Features.

In a preferred form of the vibration damping and sound insulating structure of the present invention, the vibration damping and sound insulating material is a solid and / or a fluid.

Further, another preferred embodiment of the vibration damping and sound insulating structure according to the present invention is characterized in that the solid has a longest diameter equal to or less than １ ／ of the opening diameter of the opening.

Still another preferred embodiment of the vibration-damping and sound-insulating structure according to the present invention is characterized in that the fluid is heated to show a liquid state or is vibrated to increase fluidity.

Further, a method of manufacturing a vibration damping / insulating structure according to the present invention is a method of manufacturing the above-described vibration damping / insulating structure, wherein the inside of the blind cavity is decompressed and the vibration damping / insulating material is filled. Features.

Further, another manufacturing method of the vibration damping sound insulating structure according to the present invention is a method of manufacturing the above vibration damping sound insulating structure,
The inside of the blind cavity may be filled with the vibration damping material under pressure.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vibration damping and sound insulating structure according to the present invention will be described in detail. As described above, the vibration-damping and sound-insulating structure of the present invention includes a resin molded body including a blind cavity and a vibration-damping and sound-insulating material.

Here, the resin constituting the portion other than the blind cavity in the resin molded body, that is, the raw material resin constituting the resin molded body, may be any resin which has fluidity during heat molding. Any of a plastic resin and a thermosetting resin can be used. In particular, it is preferable to use a thermoplastic resin which can easily adjust the viscosity of the resin by heating and can easily set the formation time of a blind cavity having an opening.

When a thermoplastic resin is used, the setting time of the blind cavity can be easily set. Therefore, a thermoplastic resin generally used in general injection molding, injection compression molding, compression molding, extrusion molding, stamping molding and the like is used. Specifically, olefin resins such as polyethylene and polypropylene, acrylic resins such as acrylonitrile, polystyrene resins such as ABS and polystyrene, polyamide resins, saturated polyester resins such as polycarbonate, PBT and PET, polyacetals and polyethers Sulfone, polysulfone, polyphenylene oxide, polyphenylene sulfide, polyetherimide, aromatic polyester, fluororesin, vinyl resin, or an alloy obtained by arbitrarily combining these components can also be used.

On the other hand, when a thermosetting resin is used, the curability can be adjusted by selecting the type of catalyst, the amount of catalyst, the heating temperature, and the like. In addition, these thermoplastic resins and thermosetting resins include talc, glass beads, silicon oxide, coloring pigment, metal powder, calcium carbonate, glass fiber, polyamide fiber, carbon fiber, light stabilizer, lubricant, antistatic agent,
Various additives such as a filler such as an antioxidant and a fiber reinforcing agent can be appropriately added.

A plurality of blind cavities contained in the resin molded body are present independently of each other, and the openings of these blind cavities extend toward the rear surface facing the surface of the resin molded body. In other words, such blind cavities mean cavities in which the front and back surfaces do not penetrate, and the blind cavities are not in contact with each other and form independent spaces. The blind cavity typically extends and expands in a direction from a surface (front surface) where the opening is present (front surface) to a surface (rear surface) facing the opening, and is typically cylindrical, circular,
It has a hole shape such as an elliptical sphere, a prism having an approximately square or hexagonal cross section, an eggplant shape, or a naked light bulb shape. In addition,
In the present specification, the surface where the opening of the resin molded body is present is referred to as “front surface”, and the other surface is referred to as “back surface”. However, there is no essential difference between them, and for convenience of explanation. It goes without saying that even if both are described interchangeably, they are included in the scope of the present invention.

Next, the vibration-damping and sound-insulating structure of the present invention is formed by filling the blind cavity with a vibration-damping and sound-insulating material. Here, the density of the vibration damping and sound insulating material is higher than the density of the resin molded body. When the density of the vibration-damping and sound-insulating material is equal to or less than the density of the resin molded body, the vibration-damping properties are equivalent to those without a blind cavity. Here, the density of the vibration damping sound insulating material indicates the weight of the filled vibration damping sound insulating material with respect to the volume of the blind cavity.

As the above-mentioned vibration-damping and sound-insulating material, those which can be filled in the blind cavity and exhibit desired vibration-damping and sound-insulating properties can be used. However, solid and / or fluid vibration-damping and sound-insulating materials are preferable. . In addition, whether the vibration damping material is solid or fluid can be distinguished at normal temperature, but in the present specification, for the sake of convenience of description, those that are heated and show flow or thixotropic properties are also fluid. include.

The solid vibration-damping and sound-insulating material may be metal, ceramics, resin, or particles obtained by arbitrarily combining these. For example, as shown in FIG. 10, metal particles 15a and ceramic particles 15b are contained in a resin 15e, and the resin can be used as particles 15 having a predetermined size and shape. As the above metal,
Examples include iron, copper, aluminum or zinc, alloys arbitrarily combining these, oxides of these metals, and the like.
In addition, the above-mentioned metal may be easily available, such as cutting chips and casting chips discharged in the processing step. Examples of the ceramics include silicon nitride, silicon carbide, alumina or silica, a composite oxide obtained by arbitrarily combining these, and a ceramic obtained by arbitrarily combining and mixing these ceramics and solidifying with a resin. Furthermore, examples of the resin include a polypropylene resin, a fluorine resin, a polyethylene resin, an ABS resin, and a mixture of these resins. Further, an organic fiber, an inorganic fiber, a metal fiber, or the like of less than 1 mm may be mixed therein. it can.

Further, the above particles can be coated with at least one resin layer. For example, as shown in FIG. 9, the inner layer 15c and the surface layer 15d are formed on the surface of the metal particles 15a.
Can be coated. As the resin to be coated,
Examples thereof include polypropylene resin, fluorine resin, polyethylene resin or ABS resin having high heat resistance and friction resistance, and a mixture of these resins.

Further, the above-mentioned solid vibration damping material (particles, etc.)
It is preferable that the longest diameter is not more than の of the opening diameter of the blind cavity. With such a size, it is easy to fill (inject) the vibration-damping and sound-insulating material into the blind cavity through the opening. If the longest diameter exceeds １ ／, the particles are likely to be clogged in the opening, and the filling may be extremely difficult. In addition, after filling, the volume increases or adheres to each other,
A vibration-damping and sound-insulating material having a longest diameter exceeding one half of the opening may be used. Furthermore, the shape of the vibration-damping and sound-insulating material is desirably a shape that can be easily moved and rotated in the blind cavity, and examples thereof include a spherical shape, a conical shape, and a cylindrical shape, and a spherical shape is particularly preferable.

On the other hand, as the vibration damping and sound insulating material for the fluid, there can be used a material which exhibits a liquid state when heated, and a material which increases the fluidity by being subjected to vibration. As a material that shows a liquid state when heated, asphalt, paraffin, stearic acid, or a low-molecular-weight synthetic resin that is solid at room temperature (normal temperature) but becomes a liquid state when heated, or a combination of any of these, etc. Can be illustrated. In particular, the opening sealing step (about 50 to
It is desirable that the asphalt or paraffin be in the form of a solid or solid solution at 100 ° C) and be liquid at the installation site (about 100 to 150 ° C) near the heat source such as around the engine. Examples of the asphalt include natural asphalt and petroleum asphalt. Examples of the petroleum asphalt include straight asphalt, blown asphalt,
Includes semi-blown asphalt and rubber-modified asphalt. These can be used alone or as a mixture of several types. On the other hand, the paraffin desirably has a melting point of 50 ° C. or higher, and examples thereof include liquid paraffin, bulk paraffin, and tablet paraffin.

[0027] Examples of the material which increases the fluidity by applying vibration, that is, the material having a thixotropic property in which the fluidity is poor in a stationary state and the fluidity is increased by applying a vibration, include calcium carbonate and talc. , Mica, aluminum oxide or silicon oxide, and any combination thereof, or a combination thereof with a synthetic resin having a molecular weight of 500,000 or less (eg, polyethylene, polypropylene, and polymethyl methacrylate). Can be.

Here, the solid vibration damping material (particles, particles + resin layer, etc.) and the fluid vibration damping material (heating type, thixotropic type) can be arbitrarily added according to the desired vibration damping / sound insulating effect. The blind cavity can be filled in combination to produce a vibration damping sound insulation structure. For example, the blind cavity of the resin molded body as shown in FIG. 3 is filled with only asphalt which is an example of a vibration damping and sound insulating material of a fluid (FIG. 4), and only spherical particles which are an example of a solid vibration damping and sound insulating material are filled. (FIG. 5),
By filling both (asphalt and spherical particles) (FIG. 6), a vibration damping sound insulating structure can be manufactured. Further, a vibration damping sound insulating structure in which a covering material (such as a sheet-like resin) is coated on the surface of the vibration damping sound insulating structure may be used (FIGS. 7 and 8).

Further, after filling the blind sound-absorbing material (such as spherical particles) into the blind cavity, a resin or the like is filled as a binder into the gap between the vibration-damping and sound-insulating materials and solidified, and the vibration is damped in the blind cavity. A vibration-damping and sound-insulating structure in which the sound insulating material is fixed can be provided. At this time, as the resin to be filled to fix the vibration damping and sound insulating material, a resin whose temperature can be easily set is desirable, for example, a resin that can be easily reused, that is, a resin that is the same as the constituent resin of the resin molded body, In addition, a thermosetting resin (such as an epoxy resin, a phenol resin, a melamine resin, or an unsaturated polyester resin) having little thermal deformation can be used. In particular, it is desirable to use the same resin as the resin molded body.

The resin contained in the above-mentioned vibration damping sound insulating material and the resin filling the blind cavity as a binder include organic fiber powder, metal fiber powder, calcium carbonate, talc, mica, aluminum oxide and silicon. Various additives such as a filler and an antioxidant can be blended in any combination.

Next, the vibration-damping and sound-insulating structure of the present invention is formed by sealing an opening of a blind cavity filled with the above-described vibration-damping and sound-insulating material.
Such an opening can be sealed by heating a part of the resin molded body forming the vicinity of the opening as described later, or by covering with a resin piece or a sheet-like vibration damping material. As the resin piece and the vibration damping material, a resin that can withstand frictional heat (heat resistance) and high abrasion resistance can be used, and it is particularly preferable to use a fluororesin.

Here, in the vibration-damping and sound-insulating structure of the present invention, the vibration-damping and sound-insulating material absorbs vibration energy transmitted through a solid or vibration energy transmitted through air, and a part of the absorbed energy. Is eliminated as heat energy due to frictional resistance or the like, thereby reducing or preventing sound generated due to vibration. That is, when the vibration damping and sound insulating material is a fluid, a part of the vibration energy that has propagated in the solid or in the air is blended into the frictional energy between the vibration damping sound insulating material and the inner wall of the blind cavity, the vibration damping sound insulating material. Vibration damping and sound insulation by being converted into frictional energy between metal fibers or organic fibers, frictional energy between metal particles or ceramic particles, or energy for fibers or particles to move in a fluid, and absorbed and reduced The effect can be exhibited. When the material is a vibration-damping and sound-insulating material (thixotropic) which is applied with vibration to increase fluidity, the energy required when the fluidity increases and the phase changes from solid to liquid in addition to the above energy Due to the additional consumption, more vibration-damping and sound-insulating properties can be exhibited.

On the other hand, when the vibration-damping and sound-insulating material is solid, the vibration-damping and sound-insulating material acts as a movable body inside the blind cavity, causing friction with the inner wall of the blind cavity, collision and friction between the solids, and movement of the solids. For example, the vibration energy is absorbed and reduced, and a vibration damping and sound insulating effect can be exhibited. In addition, the size and shape of the vibration damping material,
By mutually adjusting the volume of the blind cavity, the material and composition of the solid to be filled, and the volume and shape of each solid, it is possible to control the expression of the vibration-damping and sound-insulating effect of the vibration-damping and sound-insulating structure. Furthermore, when the vibration-damping and sound-insulating material is a resin-coated material (such as resin-coated metal particles), the durability period can be controlled by adjusting the resin coating thickness and the number of resin coatings (the number of resin layers). The frequency band in which vibration energy can be absorbed and reduced can be controlled by appropriately selecting the coating resin. When the vibration damping and sound insulating material is spherical, the durability and energy absorption of the vibration damping sound insulating structure tend to be high. Further, when the material is a vibration damping sound insulating material having irregularities on the surface, the initial energy absorption rate is high, but the durability tends to be poor.

Next, a method for manufacturing the vibration damping and sound insulating structure of the present invention will be described. The vibration-damping and sound-insulating structure is manufactured by molding a resin molded body having a blind cavity, filling the inside of the blind cavity with a vibration-damping and sound-insulating material, and sealing the blind cavity.

Here, a mold for molding the resin molded body and a molding method will be described with reference to the drawings.

FIGS. 1 and 2 show one embodiment of a mold for molding a resin molded body. FIG. 1 shows a state before the raw material resin of the resin molded body is injected. FIG. 2 shows that the raw material resin is injected into the cavity, and a pressure medium (such as heated compressed air) is injected into the cavity 11. Are formed.

In FIGS. 1 and 2, the molding die is
A cavity defined by a concave portion of the movable mold 1 and a convex portion of the fixed mold 2 is provided on a surface forming wall portion 2 a having a movable mold 1 and a fixed mold 2 and forming a convex portion of the fixed mold 2. 4 to raw resin 12
And a pressure medium injection part 5 for injecting a pressure medium into the cavity 4 are separately provided. The pressure medium injection unit 5 is connected via a gas chamber 3 to a gas cylinder 7, a pressure adjustment valve 8, a control valve 9 capable of controlling injection time, and a heating device 10. On the other hand, the resin injection port 6 passes through the center of the fixed mold 1 and is connected to a raw resin system (not shown).

When a resin molded body is molded using the above molding die, first, the pressure medium injection section 5 is heated to a temperature near the melting temperature of the raw material resin 12. Next, during or after the filling of the raw material resin 12 into the cavity 4, a heated pressure medium is injected from the gas chamber 3, and the blind cavity 11 is filled in the raw material resin 12.
Is molded. At this time, the pressure medium is injected in the direction from the surface forming wall portion 2a to the recess standing wall 1a (back surface forming wall portion) of the movable mold, so that the blind cavity 11 Opening 13 is formed. Further, the movable mold 1 is displaced in the injection direction during injection of the pressure medium, and promotes formation of the blind cavity 11. Inject pressure medium,
After forming the desired blind cavity 11 in the raw material resin 12, the raw material resin 12 is solidified (cooled) and released from the molding die to obtain the resin molded body 12. In addition, the filling amount of the raw material resin 12 can be set in consideration of the total volume of the resin molded product to be obtained and the total volume of the blind cavity 11. Further, by adjusting the number of pressure medium injection units 5, the volume of each blind cavity can be easily controlled, and a desired vibration damping and sound insulating effect can be exhibited. It is effective to mold the resin molded body as described above because the resin molded body having the blind cavity can be molded in one step.

In the above molding method, the flowability of the raw material resin 12 can be increased by using a heating device, and in this case, the blind cavity 11 can be formed more freely.
Further, as long as a desired resin molded body can be obtained, a mold having a structure other than the above-described mold can be used, and a mold using an injection molding method, an injection compression molding method, or the like is more preferable.
Furthermore, in the above molding die, the diameter of the pressure medium flow path, the allowance and retreat of the pressure medium injection part, the gas chamber, the pressure medium storage chamber, the tip shape, the arrangement position, the gas pressure, etc. of the pressure medium injection part are determined. The shape and volume of the blind cavity can be controlled by appropriately changing and combining the same, and the shape of the blind cavity 11 can be a circle, an ellipse, a polygon, or the like. In addition, the arrangement interval and abundance ratio of the pressure medium injection unit 5 (pressure medium ejection port) can be partially biased so that the openings 15 of the blind cavities can be uniformly distributed on the back surface of the resin molded body. It is also possible to distribute unevenly according to desired vibration damping and sound insulating properties, partial rigidity, and light weight, such as densely distributing a part. Further, the thickness of the resin surrounded by the blind cavities 11, that is, the resin corresponding to the reinforcing ribs (the resin thickness between adjacent blind cavities) is different from that of the blind cavities 11.
Can be controlled by adjusting the position and density of
This makes it possible to adjust sink marks, warpage, and variations in rigidity of the obtained resin molded body.

The vibration-damping and sound-insulating structure of the present invention is manufactured by filling a blind cavity of the above-mentioned resin molded body with a solid and / or fluid vibration-damping material and sealing the opening of the blind cavity. . Here, a filling device can be used for filling the vibration damping sound insulating material. For example, a device having a plurality of vibration damping sound insulating material inlets provided with a cutoff valve, and adjusting the cutoff valve to adjust a predetermined amount of the vibration damping sound insulating material. Devices that can fill the interior of the blind cavity can be mentioned. In addition, the injection port of the filling device can be provided for each blind cavity or provided in a fixed number and can be displaced as needed according to the product shape of the vibration damping and sound insulating structure.

When the vibration-damping and sound-insulating material is a fluid, it is desirable to provide a stirrer or the like in the above-described filling device. In this case, the components contained in the vibration-damping and sound-insulating material can be uniformly dispersed and filled. It is effective. In particular, when the vibration damping and sound-insulating material is a fluid having thixotropic properties, the fluidity does not increase unless a stirring treatment or a vibration treatment is performed, and it becomes difficult to fill the inside of the blind cavity. Further, when the liquid is a liquid that shows a liquid state by heating (such as asphalt), it is preferable to fill the liquid after increasing the fluidity by a heating means provided in the filling device. On the other hand, when the vibration damping and sound insulating material is solid, it is preferable that when the vibration damping and sound insulating material is loaded into the filling device or when filling the blind cavity, a stirring process or the like is performed and uniformly mixed before filling. .

Further, in the method of manufacturing a vibration damping and sound insulating structure according to the present invention, the inside of the blind cavity of the resin molded body is reduced in pressure to fill the vibration damping sound insulating material. For example, it is possible to put a resin molded body containing a blind cavity in a case capable of decompression, arrange an injection port of a vibration damping sound insulating material at an opening of the blind cavity, and fill the case after reducing the pressure inside the case with a vacuum pump. it can. in this case,
Since the inside of the blind cavity is decompressed, the vibration damping and sound-insulating material is sucked into the blind cavity and can be filled more quickly than under normal pressure.

In another manufacturing method of the present invention, the inside of the blind cavity of the resin molded body is filled with a vibration-damping and sound-insulating material under pressure to manufacture the vibration-damping and sound-insulating structure. For example, the interior of the blind cavity is set to normal pressure, the inside of the filling device is closed with a control valve or the like to be in a pressurized state, and then the control valve is opened, and a certain amount of the vibration damping material is filled in the blind cavity. be able to. At this time, it is desirable to provide a gap between the damping and sound-insulating material filling port and the opening, and to release the air inside the blind cavity at the time of pressurizing and filling. It is to be noted that the above-described two filling methods can be combined to fill the vibration damping sound insulating material.

In the method for manufacturing a vibration damping and sound insulating structure of the present invention,
As a method of sealing the opening of the blind cavity after filling the blind cavity with the vibration-damping and sound-insulating material, a resin forming the opening (around the opening of the resin molded body) is heated to form the opening. Can be sealed. For example, a heating source (such as a heater) is brought into contact with or close to the opening 13 to melt and seal the resin around the opening. When the vibration-damping and sound-insulating material is filled with the vibration-damping and sound-insulating material, the melting point of the resin molded body is preferably equal to or higher than the melting point of the vibration-damping and sound-insulating material (temperature indicating the fluid). In a vibration damping and sound insulating structure installed near an automobile engine, it is desirable to use a resin molded body having a melting point of about 100 ° C. or higher so as to be less susceptible to thermal denaturation after sealing the opening.

Further, a resin piece such as the same resin, polypropylene or polyethylene as the resin molded body is fixed on the opening, and the resin piece can be friction-welded. In other words, by vibrating and welding the resin pieces,
The opening can be sealed. Further, the opening is covered with a sheet-shaped or film-shaped damping material (the same resin as the resin molded body, polypropylene, polyethylene, or the like),
The opening can be sealed by pressing or compressing the vibration damping material. At this time, by covering the damping material, the damping property can be further increased. In addition, coating can be performed using a pressure compression method, a heat compression method, an adhesion method, or a known method in which these are arbitrarily combined. In addition, the above-mentioned sealing is sufficient if the desired vibration-damping and sound-insulating effect can be maintained and the vibration-damping and sound-insulating material inside the blind cavity cannot escape to the outside, and the opening is closed with a mesh-like sheet or the like.
The inner diameter of the opening can be reduced. Further, when the vibration damping and sound insulating material is fixed in the blind cavity or when the size is equal to or larger than a predetermined size, it is sufficient to seal the opening as necessary.

The vibration-damping and sound-insulating structure manufactured by the above manufacturing method can be reduced in weight because the resin molded body includes a blind cavity. Further, since the blind cavity is filled with the vibration-damping and sound-insulating material, the volume of the vibration-damping and sound-insulating structure can be reduced. Therefore, for example, the resin product itself can be used as a vibration damping and sound insulating structure, or can be used by attaching it to a desired portion of a product to which vibration damping and sound insulating properties are to be imparted. Furthermore, the vibration-damping and sound-insulating effect can be controlled by blending various kinds of vibration-damping and sound-insulating materials to fill the blind cavities, or selecting or adjusting the vibration-damping and sound-insulating materials and the covering material for sealing the openings for each blind cavity. .

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings by way of examples and comparative examples, but the present invention is not limited to these examples.

In the following examples and comparative examples, first, a resin molded body having a blind cavity was molded by a resin molding die, and then a vibration damping and sound insulating structure was manufactured.

(1) Molding of Resin Molded Body An injection molding machine having a mold clamping pressure of 110 t is set, a pressure medium can be injected from a fixed mold, and the volume in the cavity is 100%.
A mold that can be displaced to x100 × 3 (before variable) to 10 (after variable) mmt was used. A polypropylene (PP) resin (trade name: XK4157V) melted into the cavity from the resin injection portion of the fixed mold was injection molded at a resin temperature of 180 ° C. to obtain a resin molded body having a blind cavity. The mold temperature was 50 ° C., and the pressure medium was supplied at 100 ° C. using air (heated compressed air). The outline at this time is shown in FIG. 1 (before injection molding) and FIG. 2 (after injection molding).

(2) Manufacture of the vibration-damping and sound-insulating structure The vibration-damping and sound-insulating material obtained in or below is filled in the blind cavity of the resin molded body, and the opening of the blind cavity is sealed.
A vibration damping and sound insulating material structure was manufactured.

Preparation of Solid Vibration Suppressing and Sound Insulating Material φ1 mm iron or copper particles and polypropylene resin which is the same as the resin molded product are melted and coated,
1.5 mm resin-coated metal particles were prepared. Further, the above-mentioned vibration damping and sound insulating material is coated by melting and coating a fluororesin (trade name: NEOFLON PFA manufactured by Daikin Industries, Ltd.).
Was prepared. Further, similarly, φ1 mm
Resin-coated ceramic particles obtained by melting and coating a polypropylene resin on α-alumina particles, and resin-coated ceramic particles obtained by coating this with a fluororesin. The sizes of the resin-coated metal particles and the resin-coated ceramic particles were substantially the same.

A mixture of 0.1 mm iron particles and α-alumina particles was mixed and mixed with a polypropylene resin.
Spherical particles with a diameter of about 2
Spherical particles having a diameter of mm were prepared.

Preparation of Fluid Vibration Insulation Material Straight Asphalt Made from Petroleum and Melting Point 70
A paraffin at a temperature of ° C. which was heated and melted, and a paraffin blended with the resin-coated metal particles and / or the resin-coated ceramic particles in a predetermined amount were prepared.

Sealing of the opening After filling the solid vibration damping material and / or the fluid vibration damping material in the blind cavity of the resin molded body, the resin around the opening is melted by a heater, or 1 mmt. The asphalt-based vibration damping material was heat-pressed to seal the opening of the blind cavity.

Example 1 The above resin molded article was 100 × 1
It was set to 00 × 6 mmt, and the melted straight asphalt was press-fitted into the blind cavity and filled to the opening. After cooling, the opening was heated with a heater to melt and seal the resin around the opening. Nine of these resin molded bodies were adhered with an epoxy resin to produce a 300 × 300 × 6 mmt vibration damping sound insulation structure. Table 1 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

(Example 2) As vibration damping and sound-insulating materials to be filled in blind cavities, iron particles having a diameter of 1 mm and asphalt were 50/5.
The same operation as in Example 1 was repeated except that the vibration-damping and sound-insulating material was mixed at 0 (wt ratio) to manufacture a vibration-damping and sound-insulating structure. The thickness of the vibration damping sound insulating structure, the vibration damping material (wt
Table 1 shows the ratio), the method of sealing the opening, and the evaluation results.

Example 3 A vibration damping sound insulating structure was manufactured by repeating the same operation as in Example 1 except that iron particles (φ1.5 mm) coated with a polypropylene resin were used instead of asphalt. . The thickness of this vibration-damping sound-insulating structure,
Table 1 shows the vibration damping and sound insulating material type (wt ratio), the method of sealing the opening, and the evaluation results.

Example 4 A vibration damping and sound insulating structure was manufactured by repeating the same operation as in Example 1 except that copper particles (φ1.5 mm) coated with a polypropylene resin were used instead of asphalt. . The thickness of this vibration-damping sound-insulating structure,
Table 1 shows the vibration damping and sound insulating material type (wt ratio), the method of sealing the opening, and the evaluation results.

Example 5 Iron particles (φ1.5 mm) coated with polypropylene resin and asphalt were mixed with 50/5.
The same operation as in Example 1 was repeated, except that the vibration-damping and sound-insulating material mixed at 0 (wt ratio) was used, to produce a vibration-damping and sound-insulating structure. The thickness of the vibration-damping and sound-insulating structure, the vibration-damping and sound-insulating material (w
Table 1 shows the t ratio), the method of sealing the opening, and the evaluation results.

(Example 6) A vibration damping and sound insulating material obtained by mixing iron particles (φ2 mm) coated with a polypropylene resin and further coated with a fluorine-based resin and asphalt at a ratio of 50/50 (wt ratio) was used. The same operation as in Example 1 was repeated to produce a vibration damping sound insulating structure. Table 1 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

Example 7 α-alumina particles (φ1 m
m) and asphalt were mixed at a 50/50 (wt ratio), except that a vibration-damping and sound-insulating material was used, to produce a vibration-damping and sound-insulating structure by repeating the same operation as in Example 1. Table 1 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

Example 8 Iron particles (φ1.5 mm) coated with a polypropylene resin and paraffin were mixed in a ratio of 50/50.
The same operation as in Example 1 was repeated, except that the vibration-damping and sound-insulating material mixed at (wt ratio) was used, to produce a vibration-damping and sound-insulating structure. The thickness of the vibration damping sound insulating structure, the vibration damping material (wt
Table 1 shows the ratio), the method of sealing the opening, and the evaluation results.

Example 9 Asphalt, iron particles (φ1.5 mm) coated with polypropylene resin and α-alumina coated with polypropylene resin were mixed with 50/30/20.
The same operation as in Example 1 was repeated, except that the vibration-damping and sound-insulating material mixed at (wt ratio) was used, to produce a vibration-damping and sound-insulating structure. The thickness of the vibration damping sound insulating structure, the vibration damping material (wt
Table 1 shows the ratio), the method of sealing the opening, and the evaluation results.

(Example 10) Vibration suppression in which iron particles coated with asphalt, polypropylene resin and fluorine resin, and α-alumina coated with polypropylene resin and fluorine resin were mixed at a ratio of 50/30/20 (wt ratio). The same operation as in Example 1 was repeated except that the sound insulating material was used,
A vibration damping and sound insulating structure was manufactured. Table 1 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

Example 11 Iron particles (φ0.1 mm)
α-Alumina particles (φ0.1 mm) and a polypropylene resin were mixed at a ratio of 40/40/20 (wt ratio), and after heating and melting, processed into spherical particles of about φ1.5 mm. The same operation as in Example 1 was repeated, except that a vibration damping / insulating material obtained by mixing the spherical particles and asphalt at a ratio of 50/50 (wt ratio) was used, to produce a vibration damping / insulating structure. Table 1 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

Example 12 Asphalt, iron particles (φ1.5 mm) coated with polypropylene resin, and surface-treated nylon short fibers of less than 0.5 mm
The same operation as in Example 1 was repeated, except that the vibration-damping and sound-insulating material mixed at 45/5 (wt ratio) was used, to produce a vibration-damping and sound-insulating structure. Table 1 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

Example 13 The same operation as in Example 5 was repeated, except that the opening of the blind cavity was sealed by heating and pressing a 1 mmt asphalt-based damping material to form a vibration-damping and sound-insulating structure. Manufactured. Table 1 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

(Comparative Example 1) A resin molded body of 100 × 100 × 6 mmt, except that the opening was heated with a heater while the interior of the blind cavity was empty (unfilled), and the resin around the opening was melted and sealed. By repeating the same operation as in Example 1, a vibration damping and sound insulating structure was manufactured. Table 2 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

(Comparative Example 2) Without heating the opening with a heater, a 1 mmt asphalt-based damping material was heated and pressed.
The same operation as in Comparative Example 1 was repeated, except that the opening was sealed, to produce a vibration damping sound insulating structure. Table 2 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

(Comparative Example 3) A 3 mmt resin molded article having no blind cavity was molded without injection of a pressure medium during molding of the resin molded article. A 5 mmt felt was bonded to the resin molded body by a known method. Except for this, the same operation as in Comparative Example 1 was repeated to manufacture an 8 mmt vibration damping sound insulating structure. The thickness of the vibration damping sound insulating structure, the vibration damping material (wt
Table 2 shows the ratio), the method of sealing the opening, and the evaluation results.

(Comparative Example 4) 5 mmt instead of felt
The same operation as in Comparative Example 3 was repeated, except that the urethane foam resin was used, to produce an 8 mmt vibration-damping and sound-insulating structure. The thickness of the vibration damping sound insulating structure, the vibration damping material (wt
Table 2 shows the ratio), the method of sealing the opening, and the evaluation results.

(Comparative Example 5) 3 mmt manufactured in Comparative Example 3
Comparative Example 3 except that the resin molded product (without a blind cavity) was used.
The same operation as described above was repeated to produce a 3 mmt vibration damping sound insulation structure. Table 2 shows the thickness of the vibration-damping and sound-insulating structure, the type of vibration-damping and sound-insulating material (wt ratio), the method of sealing the opening, and the evaluation results.

(3) Evaluation The vibration-damping and sound-insulating structures obtained in Examples 1 to 12 and Comparative Examples 1 to 5 were evaluated for vibration-damping properties, sound-insulating properties and easy filling. In addition, based on these evaluation results, each vibration damping sound insulation structure was comprehensively determined (Tables 1 and 2).

The damping property was evaluated by a loss coefficient. Here, the “loss factor” is
A value indicating a damping range or a resistance component with respect to the vibration system. The larger this value is, the better the vibration damping property is. Nine pieces of each damping and sound-insulating structure were adhered to each other with epoxy resin to have a size of 300 mm x 300 mm. Was. At this time, a sensor was attached to the center of the vibration-damping and sound-insulating structure, acceleration response was measured, and a frequency response analysis was performed on the measured value to determine a loss coefficient.

Sound Insulating Property Nine vibration damping and sound insulating structures were laminated with epoxy resin to obtain 3
The size is 00 × 300 mm, and as shown in FIG.
The vibration-damping and sound-insulating structure is installed at a position 50 cm away from the sound source installed in front of the sound-insulating structure, and further 5c from the vibration-damping and sound-insulating structure.
A microphone was placed behind the m, and the sound insulation was evaluated by obtaining the weight loss sound in each frequency band. The weight loss sound is a value measured in a 1/3 octave band.

Easy Filling Each of the vibration damping and sound-insulating structures was placed horizontally, and the inner diameter of the blind cavity (φ1
A funnel having the same inner diameter as 0 mm) was installed, and each vibration-damping and sound-insulating material (filler) was filled under atmospheric pressure. At this time, the degree of clogging of the opening was visually judged. When there was clogging of the opening, it was evaluated as "x", and when there was no clogging, it was evaluated as "o". In addition, 10 blind cavities were determined for one vibration-damping and sound-insulating material.

[0077]

[Table 1]

[0078]

[Table 2]

As shown in Tables 1 and 2, within the range of the present invention, the vibration damping performance of the vibration damping / insulating structure can be improved.
It can be seen that sound insulation can be provided in accordance with a desired frequency band. Further, it can be seen that the vibration-damping and sound-insulating material can be easily filled. On the other hand, in the comparative example, since the vibration damping and sound insulating structure having a configuration outside the scope of the present invention is used, it is understood that the vibration damping and sound insulating properties are significantly reduced.

Although the present invention has been described in detail with reference to preferred examples and comparative examples, the present invention is not limited to these examples, and various modifications can be made within the scope of the present invention. . For example, in the resin molded body, the openings of the blind cavities can be provided not only on the front surface but also on both the back surface and the front and back surfaces. Further, regarding the fixed mold and the movable mold included in the resin molding mold, the fixed side and the movable side can be replaced with each other, and further, both can be displaced.

[0081]

As described above, according to the present invention, a vibration-damping and sound-insulating structure is formed by filling a blind cavity of a resin molding with a predetermined vibration-damping and sound-insulating material. It is possible to provide a vibration-damping and sound-insulating structure which has a vibration / sound insulating effect, is lightweight (thin-walled), has good rigidity and durability, and is easy to manufacture, and a method for manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a mold for molding a resin molded body (before resin injection).

FIG. 2 is a cross-sectional view showing an example of a mold for molding a resin molded body (after resin injection).

FIG. 3 is a plan view showing an example of a resin molded product (before filling with a vibration damping sound insulating material) and a cross-sectional view taken along line AA.

4 is a plan view showing an example of a vibration-damping and sound-insulating structure in which a vibration-damping and sound-insulating material (asphalt) is filled in the resin molded body of FIG. 3, and a cross-sectional view taken along line AA.

FIG. 5 is a plan view showing an example of a vibration damping sound insulating structure in which a vibration damping sound insulating material (spherical particles) is filled in the resin molded body of FIG. 3, and AA.
It is sectional drawing cut | disconnected along the line.

6 is a plan view showing an example of a vibration damping sound insulating structure in which a vibration damping sound insulating material (asphalt + spherical particles) is filled in the resin molded body of FIG. 3, and a cross-sectional view taken along line AA.

7 is a plan view showing an example of the vibration damping sound insulating structure in which the surface of the vibration damping sound insulating structure of FIG.
It is sectional drawing cut | disconnected along the line.

8 is a plan view showing an example of the vibration damping sound insulating structure in which a sheet-like resin is coated on the surface of the vibration damping sound insulating structure of FIG. 6, and AA.
It is sectional drawing cut | disconnected along the line.

FIG. 9 is a cross-sectional view illustrating an example of spherical particles (metal particles + inner layer + surface layer).

FIG. 10 is a cross-sectional view showing an example of spherical particles (metal particles + ceramic particles + particle binding resin).

FIG. 11 is a schematic diagram showing an example of a method for evaluating sound insulation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed mold 1a Back molding wall 2 Movable mold 2a Surface molding wall 3 Gas chamber 4 Cavity 5 Pressure medium injection part (pressurized gas injection nozzle) 6 Resin injection port 7 Pressure medium source (gas cylinder) 8 Pressure adjustment Valve 9 Control valve 10 Heating device 11 Blind cavity 12 Resin molding (raw resin) 13 Blind cavity opening 14 Coating resin (sheet-like resin) 15 Vibration damping sound insulation material (particles) 15a Metal particles 15b Ceramic particles 15c Coating resin (inner layer) 15d coating resin (outer layer) 15e particle-binding resin 20 vibration-damping and sound-insulating structure 21 sound source 22 microphone 23 support

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Uesugi 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Masaaki Suzuki 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor F Terms (reference) 2E001 DF02 DG01 GA07 HD11 JA06 JA22 JA29 JB01 JD04 3J048 AA06 AC02 BD01 BE06 BE14 EA36 EA38 3J066 AA21 BD03 BD05

Claims (10)

[Claims] 1. A vibration-damping and sound-insulating structure comprising a resin molded body including a plurality of independent blind cavities having an opening on a front surface and extending in a rear direction, and a vibration-damping and sound-insulating material. A vibration-damping and sound-insulating structure, wherein the density of the vibration-insulating material is higher than the density of the resin molded body, and the vibration-damping and sound-insulating material is filled in the blind cavity and the opening is sealed. 2. The vibration damping / insulating structure according to claim 1, wherein the vibration damping / insulating material is a solid and / or a fluid. 3. The method according to claim 1, wherein the solid is 1 / (the diameter of the opening of the opening).
The vibration-damping and sound-insulating structure according to claim 2, having a longest diameter of 2 or less. 4. The method according to claim 1, wherein the solid is a particle comprising at least one selected from the group consisting of a metal, a ceramic and a resin, and / or the particle is coated with at least one resin layer. The vibration-damping and sound-insulating structure according to claim 2 or 3, wherein: 5. The vibration damping and sound insulating structure according to claim 4, wherein said particles are spherical. 6. The vibration damping and sound insulating structure according to claim 2, wherein the fluid is heated to show a liquid state or is vibrated to increase fluidity. 7. The method for manufacturing a vibration damping and sound insulating structure according to claim 1, wherein the inside of the blind cavity is decompressed and the vibration damping and sound insulating material is filled. A method for producing a vibration damping sound insulating structure. 8. A method for producing a vibration damping and sound insulating structure according to claim 1, wherein the vibration damping and sound insulating material is pressure-filled inside the blind cavity. A method for producing a vibration damping sound insulating structure. 9. After filling the vibration-damping and sound-insulating material into the blind cavity,
9. The opening is sealed by heating the resin forming the opening or by fixing a resin piece on the opening and performing friction welding. Method for manufacturing a vibration damping and sound insulating structure. 10. After filling the blind cavity with the vibration-damping and sound-insulating material, cover the opening with a sheet-shaped or film-shaped vibration-damping material, and pressurize or compress the vibration-damping material to form the opening. The method for manufacturing a vibration damping and sound insulating structure according to claim 7, wherein the portion is sealed.