KR102703075B1 - shock absorbing structure and making methods for shock absorbing structure - Google Patents

Abstract

The present invention relates to a shock-absorbing structure and a method for manufacturing a shock-absorbing structure, comprising a plurality of films having mountains and valleys repeatedly formed on a surface and integrally laminated in a stacked state, the depth of the valleys being 1/1000 to 1/1000 of the film thickness, and being mounted between an automobile interior trim and a body panel, and being simple to manufacture, inexpensive to manufacture, easy to thin, and capable of thinning, thereby enabling mounting between an automobile interior trim and a body panel having a fine gap, and a method for manufacturing a shock-absorbing structure.

Description

{shock absorbing structure and making methods for shock absorbing structure}

The present invention relates to a shock absorbing structure and a method for manufacturing the shock absorbing structure, and more particularly, to a shock absorbing structure installed between an automobile interior trim and a body panel at intervals of several millimeters, and a method for manufacturing the shock absorbing structure.

The structures that were manufactured to absorb or mitigate shocks in the past had complicated manufacturing processes, required expensive equipment, were expensive to manufacture, and were difficult to thin. In addition, since most of them were made of metal materials with excellent castability, their application range was limited.

Meanwhile, there is a gap of millimeters between the interior trim, such as the pillar trim and headlining, exposed inside the car and the body panels, making it difficult to install structures that were previously manufactured to absorb or alleviate shocks.

Republic of Korea Patent Publication No. 10-2014-0002983 (January 9, 2014)

The purpose of the present invention, which was invented in consideration of the above points, is to provide a shock absorbing structure and a method for manufacturing a shock absorbing structure, which is manufactured at a low manufacturing cost, can be made thin, and can be installed between an automobile interior trim and a body panel by simply manufacturing a structure manufactured for shock absorption or mitigation.

In order to achieve the above purpose, a shock absorbing structure of one embodiment of the present invention comprises a plurality of films that are integrally formed in a laminated state and have mountains and valleys repeatedly formed on the surface, the depth of the valleys based on the surface being 1/1000 to 1/1000 of the film thickness, and is mounted between an automobile interior trim and a body panel.

Additionally, the mountains and valleys can be formed at equal intervals along the width direction of the film.

Additionally, the mountains and valleys can be formed at equal intervals along the width direction perpendicular to the width direction, so as to form a checkerboard pattern.

In addition, when the grating edge moves in the width direction of the film while in contact with the surface of the film, multiple mountains and valleys can be formed on the surface of the film.

Additionally, by pressing the surface of the film by the flat edge, mountains and valleys can be formed in the film.

In addition, when an eccentric roll is positioned above the flat edge and the roll rotates in an eccentric state, the surface of the film is pressed by the flat edge, and mountains and valleys can be formed.

In addition, a length-variable member whose length is repeatedly changed according to the voltage applied to one side of the flat edge is mounted, and depending on the change in voltage applied to the length-variable member, the surface of the film is pressed by the flat edge, and mountains and valleys can be formed.

Additionally, the mountains and valleys are formed on the upper surface of the surface of the film, and multiple films can be laminated so that the mountains formed on the upper surface are in contact with the lower surface.

Additionally, the mountains and valleys are formed on the upper and lower surfaces of the film, and a plurality of films can be laminated so that the mountains formed on the upper surface and the mountains formed on the lower surface are in contact.

Additionally, multiple films can be laminated inside the chamber and integrated by heat bonding by convection heat inside the chamber.

In addition, multiple films can be laminated and integrated by being pressed by a pressurizing mechanism and bonded by heat and ultrasonic waves generated by the pressurizing mechanism.

Additionally, multiple films can be joined and integrated by being heated to a glass transition temperature in a laminated state and pressurized by a pressurizing mechanism.

In order to achieve the above purpose, a method for manufacturing a shock-absorbing structure according to an embodiment of the present invention includes a step of fixing a film, a step of pressing a surface of the film by an external force, and a step of forming a plurality of grooves by moving the external force pressing the film along the width direction of the film, wherein the external force is applied to the film by a mold equipped with a grating edge inserted into the film.

In addition, the step of heating the grating edge is further included, and the step of heating the grating edge can be performed between the step of fixing the film and the step of forming the groove.

In order to achieve the above purpose, a method for manufacturing a shock absorbing structure according to one embodiment of the present invention includes a step in which a film begins to move from a start position to an end position, and a step in which a plurality of grooves are formed as a surface of the moving film is repeatedly pressed by an external force.

In addition, an external force is applied to the film by a mold having a flat edge inserted into the film, a roll is positioned on the upper surface of the mold, the roll is rotated in an eccentric state, and according to the rotation of the roll, the flat edge can be inserted into the film surface and then moved from the inside of the surface to the outside of the surface.

In addition, an external force is applied to the film by a mold equipped with a flat edge inserted into the film, and a length-variable member whose length is repeatedly changed according to the applied voltage is mounted on one side of the mold, and according to a change in the voltage applied to the length-variable member, the flat edge can be inserted into the film surface and moved from the inside of the surface to the outside of the surface.

Additionally, after the grooves are formed in plurality along a first direction on the surface of the film, they can be formed in plurality along a second direction that is perpendicular to the first direction.

In addition, the method further includes a step of bonding and integrating a plurality of films having a plurality of grooves formed therein, and in the step of integrating, the plurality of films may be laminated inside a chamber and heated and bonded by heat convected inside the chamber.

In addition, the method further includes a step of bonding and integrating a plurality of films on which bones are formed, and in the step of integrating, the plurality of films can be bonded by heat and ultrasonic waves generated by the pressing mechanism while being pressed by the pressing mechanism in a laminated state.

In addition, the method further includes a step of bonding and integrating a plurality of films in which bones are formed, and in the step of integrating, the plurality of films can be bonded by being heated to a glass transition temperature in a laminated state and pressurized by a pressurizing mechanism.

According to the shock absorbing structure and the shock absorbing structure manufacturing method of one embodiment of the present invention configured as described above, since films having continuous hills and valleys are laminated to form an integrated structure, the shock absorption amount is maximized, and since hills and valleys are formed by a mold, manufacturing is simple, the manufacturing cost is low, and thin film formation is easy. In particular, since thin film formation is possible, it can be installed between an automobile interior trim and a body panel having a fine gap.

Figures 1 and 2 are perspective views of a shock absorbing structure of one embodiment of the present invention.
Figure 3 is a perspective view of a film included in the shock absorbing structure of Figure 1.
Figure 4 is a flow chart of a method for manufacturing a shock absorbing structure according to one embodiment of the present invention.
Figure 5 is a state diagram of manufacturing a film according to the procedure diagram illustrated in Figure 4.
Figure 6 is a procedure diagram of a method for manufacturing a shock absorbing structure according to one embodiment of the present invention.
Figure 7 is a state diagram of manufacturing a film according to the procedure diagram illustrated in Figure 6.
Figure 8 is a flow chart of a method for manufacturing a shock absorbing structure according to one embodiment of the present invention.
Figure 9 is a state diagram of manufacturing a film according to the procedure diagram illustrated in Figure 8.
Figure 10 is a state diagram of manufacturing a film included in the shock absorbing structure of Figure 1.
Figure 11 is a diagram showing a state in which grooves are formed in a grid shape in the film of Figure 1.
Figures 12 and 13 are drawings showing the bonding of the laminated films of Figure 1.
Fig. 14 is a perspective view of a device for dropping a steel ball onto the impact-absorbing structure of Fig. 1 and a diagram showing a state in which the steel ball rebounds.
Figure 15 shows the result of dropping a chain onto the shock absorbing structure of Figure 1.
Fig. 16 is a perspective view of a device for applying a shock to the shock absorbing structure of Fig. 1.
Figure 17 is a graph showing the results of an impact test of the shock absorbing structure of Figure 1.

Hereinafter, a shock absorbing structure (100) mounted between an automobile interior trim and a body panel according to one embodiment of the present invention will be described with reference to the attached drawings.

As illustrated in FIGS. 1 to 3, a shock absorbing structure (100) mounted between an automobile interior trim and a body panel of one embodiment of the present invention includes a plurality of films (110) having mountains (111) and valleys (112) repeatedly formed on the surface, and the plurality of films (110) are integrally formed in a laminated state. The depth of the valleys (112) is 1/1000 to 3/1000 of the thickness of the film (110).

The height of the mountain (111) is the same as the depth of the valley (112). The film (110) is made of a metal material or a polymer material. As shown in FIGS. 1 to 3, mountains (111) and valleys (112) are repeatedly formed on the upper surface of the film (110), or mountains (111) and valleys (112) are continuously formed on the upper and lower surfaces of the film (110).

The mountains (111) and valleys (112) form air pockets together with the mountains (111) and valleys (112) formed on the surfaces of each film (110) that are laminated vertically. The self-elasticity of the film (110) and the increase in the buffer space due to the air pockets increase the shock absorption efficiency transmitted from the outside. Since the film (110) is made of polymer, it is easy to thin the film. Even if the film (110) is made of metal, the mold (M) used for surface processing of the film (110) to form the mountains (111) and valleys (112) can be selected so that the hardness of the mold (M) is higher than that of the metal. Therefore, thinning is possible and the manufacturing cost is low.

According to an example, the thickness of the film (110) may be 0.1 millimeter, and the total thickness of a plurality of films (110) laminated may be within 50 millimeters. In particular, the mountains (111) and the valleys (112) may be formed to form a regular pattern. The mountains (111) and the valleys (112) are formed at equal intervals along the width direction of the film (110). The mountains (111) and the valleys (112) are also formed at equal intervals along the width direction perpendicular to the width direction so as to form a checkerboard shape.

A shock absorbing structure according to an embodiment of the present invention configured as described above is manufactured according to the procedures illustrated in FIGS. 4 to 5. As illustrated in FIGS. 4 to 5, a method for manufacturing a shock absorbing structure according to an embodiment of the present invention includes a step (S110) in which a film (110) is fixed, a step (S120) in which an uneven portion is heated, a step (S130) in which a surface of the film (110) is pressed by an external force, and a step (S140) in which a plurality of grooves are formed on the surface of the film (110) as the external force moves along the width direction of the film (110). In this case, as illustrated in FIG. 5, the external force is applied to the film (110) by a mold (M) equipped with a grating edge inserted into the film (110).

As shown in FIGS. 4 and 5, a method of forming a groove (112) on a film (110) is called a dynamic nano inscribing (DNI) method. When the grating edge of a heated mold (M) is inserted while pressing the surface of a fixed film (110), the mold (M) moves along the width direction of the film (110), thereby simultaneously forming a plurality of grooves (112) and mountains (111) on the surface of the film (110).

Meanwhile, a shock absorbing structure according to an embodiment of the present invention may be manufactured according to a procedure as illustrated in FIGS. 6 and 7. As illustrated in FIGS. 6 and 7, a method for manufacturing a shock absorbing structure according to an embodiment of the present invention includes a step (S210) in which a film (110) begins to move from a start position to an end position, and a step (S220) in which a plurality of grooves (112) are formed on the surface of the film (110) as the surface of the film (110) being moved is repeatedly pressed by an external force.

As illustrated in Fig. 7, an external force is applied to the film (110) by a mold (M) equipped with a flat edge inserted into the film (110). A roll (R) is positioned on the upper surface of the mold (M). The roll (R) rotates in an eccentric state, and as the roll (R) rotates, the flat edge is inserted into the surface of the film (110) and then moved from the inside of the surface to the outside of the surface.

As shown in FIGS. 6 and 7, a method of forming a groove (112) on a film (110) is called a VIP (vibrational indentation patterning) method. The flat edge of a mold (M) positioned under the roll (R) is repeatedly moved up and down by the rotation of an eccentric roll (R). As the flat edge repeatedly presses the surface of the film (110) moving under the mold (M), grooves (112) and mountains (111) are continuously formed on the surface of the film (110).

In addition, the shock absorbing structure of one embodiment of the present invention may be manufactured according to the procedure illustrated in FIGS. 8 and 9. As illustrated in FIGS. 8 and 9, the method for manufacturing the shock absorbing structure of one embodiment of the present invention includes a step (S310) in which a film (110) begins to move from a start position to an end position, and a step (S320) in which a groove is formed as the surface of the moving film (110) is repeatedly pressed by an external force.

An external force is applied to the film (110) by a mold (M) having a flat edge inserted into the film (110). A length-variable member whose length is repeatedly changed according to the applied voltage is mounted on one side of the mold (M). According to an example, the length-variable member may be provided as a piezo stack (P) as illustrated in FIG. 9. Depending on the change in voltage applied to the length-variable member, the flat edge is inserted into the surface of the film (110) and then moves from the inside of the surface to the outside of the surface.

As shown in FIGS. 8 and 9, a method of forming a valley (112) on a film (110) is called a PZP (piezo actuator-driven patterning) method. The length of the piezo stack (P) is repeatedly changed according to the voltage applied to the piezo stack (P), and the flat edge of the mold (M) located at the end of the piezo stack (P) repeatedly applies pressure to the film (110) moving under the mold (M), thereby continuously forming valleys (112) and mountains (111) on the surface of the film (110).

According to one embodiment of the present invention, as shown in FIG. 10, valleys (112) and mountains (111) are continuously formed on the surface of the film (110). At this time, as shown in FIG. 10 a or FIG. 10 b, valleys (112) and mountains (111) can be continuously formed on the surface of the film (110) only by one of the DNI and VIP methods. In this case, the mold (M) is fixed at the working position, and the film (110) is rotated.

Meanwhile, as illustrated in FIG. 10c or FIG. 10d, the DNI and VIP methods may be used in combination to continuously form mountains (111) and valleys (112) on the surface of the film (110). In this case, as the mold (M) rotates, the grating edge provided on one side of the mold (M) may be used to form mountains (111) and valleys (112) through the DNI method, and the flat edge provided on the other side of the mold (M) may be used to form mountains (111) and valleys (112) through the VIP method. The film (110) remains fixed at the working position during application of the DNI method without rotation, and moves from the working start position to the end position during application of the VIP method.

Accordingly, during application of the DNI method, while the film (110) is fixed, the mold (M) moves while pressing the film (110), so that mountains (111) and valleys (112) are continuously formed on the surface of the film (110) in the first direction, and during application of the VIP method, while while the film (110) is moved, the mold (M) repeatedly presses the film (110), so that mountains (111) and valleys (112) are continuously formed on the surface of the film (110) in the second direction perpendicular to the first direction.

A plurality of films (110) can be integrated inside a heating mantle (HM), as illustrated in Fig. 11. A plurality of films (110) are laminated inside a chamber (C) provided in the heating mantle (HM). Then, they are integrated by being heated and bonded by heat convected inside the chamber (C).

A plurality of films (110) may be integrated by a pressurizing mechanism (D), as shown in Fig. 12. A plurality of films (110) are integrated by being pressed by the pressurizing mechanism (D) in a laminated state and bonded by the heat and ultrasonic waves generated by the pressurizing mechanism (D).

In addition, the plurality of films (110) may be integrated by being heated to the glass transition temperature, as illustrated in Fig. 13. The plurality of films (110) are integrated by being heated to the glass transition temperature in a laminated state and being pressed by a pressurizing mechanism (D) to bond them together.

Figure 14 is a perspective view of a test device (FD) that drops a steel ball (B) onto the shock absorbing structure of Figure 1 and a diagram showing the state in which the steel ball (B) rebounds.

A steel ball (B) falls freely from a height of 500 millimeters toward a shock absorbing structure (100). The shorter the height from which the steel ball (B) rebounds, the greater the shock absorption.

As shown in Fig. 15, when a steel ball (B) was dropped on the test device (FD) (A), the steel ball (B) rebounded to a height of 293 millimeters. When the steel ball (B) was dropped toward a film bundle in which the mountains (111) and valleys (112) were not formed continuously (B), the steel ball (B) rebounded to a height of 243 millimeters. When the steel ball (B) was dropped toward the shock absorbing structure (100) of Fig. 1 (C), the steel ball (B) rebounded to a height of 209 millimeters.

That is, it can be seen that the shock absorbing structure (100) of one embodiment of the present application has higher shock absorbing efficiency than when films are simply laminated.

Fig. 16 is a perspective view of a device (ID) that applies an impact to the shock absorbing structure (100) of Fig. 1. The device (ID) illustrated in Fig. 16 has an impact measuring head (IH) that strikes the shock absorbing structure (100) placed on a shelf (S), and an impulse generated in the shock absorbing structure (100) is measured by a sensor provided on the shelf (S).

Figure 17 shows the test results of a film bundle in which mountains (111) and valleys (112) are not formed continuously and the test results of the shock absorbing structure (100) of Figure 1. The test results are expressed numerically in Table 1 below.

Impact(mNS) Force(N) Duration(ms) Velocity(m/s) Distance(mm) A 126.6133 295.89 1.6924 2.0444 10.0341 B 119.7654 296.58 1.5912 2.0536 10.782

It can be seen that the maximum impact amount and force generated on the shelf (S) are smaller when the shock absorbing structure (100) is tested than when the film bundle is tested. That is, it can be seen that the shock absorbing structure (100) of Fig. 1 has a higher efficiency in absorbing an externally applied shock than the film bundle, and reduces the force transmitted to the shelf (S) more. According to the shock absorbing structure (100) of one embodiment of the present invention configured as described above, since a plurality of films (110) in which mountains (111) and valleys (112) are formed are provided in an integrated state, the manufacturing process is simple, the manufacturing cost is low, and it is easy to thin the film. In particular, since thinning is possible, it can be installed between an automobile interior trim and a body panel having a fine gap.

100: Shock absorbing structure 110: Film
111: Mountain 112: Valley
M: Mold R: Roll
P: Piezo stack HM: Heating mantle
C: Chamber D: Pressurizing mechanism
FD: Drop test device B: Steel ball
ID: Impact device IH: Impact measuring head
S: shelf

Claims (21)

It comprises a plurality of films that are integrally formed in a laminated state, with mountains and valleys repeatedly formed on the surface,
In the film, the depth of the valley is formed to be 1/1000 to 3/1000 of the thickness of the film based on the surface, and the mountain is continuously formed from the surface to the depth of the valley.
A shock absorbing structure installed between the interior trim and body panel of a car.
In the first paragraph,
The above-mentioned mountains and valleys are shock-absorbing structures formed at equal intervals along the width direction of the above-mentioned film.
In the second paragraph,
The above-mentioned mountains and valleys are formed at equal intervals along the width direction perpendicular to the width direction, so as to form a checkerboard shape.
In the first paragraph,
A shock absorbing structure in which a plurality of mountains and valleys are formed on the surface of the film by moving the grating edge in the width direction of the film while the grating edge is in contact with the surface of the film.
In the first paragraph,
A shock absorbing structure in which the surface of the film is pressed by a flat edge, thereby forming the mountains and valleys in the film.
In paragraph 5,
An eccentric roll is positioned above the above flat edge,
A shock absorbing structure in which the surface of the film is pressed by the flat edge as the roll rotates in an eccentric state, and the mountains and valleys are formed.
In paragraph 5,
A length-variable member whose length is repeatedly changed according to the voltage applied to one side of the above flat edge is mounted,
A shock absorbing structure in which the surface of the film is pressed by the flat edge and the mountain and the valley are formed according to a change in voltage applied to the length-variable member.
In the first paragraph,
The above mountain and the above valley are formed on the upper surface of the surface of the film,
A shock absorbing structure in which a plurality of films are laminated so that the acid formed on the upper surface contacts the lower surface.
In the first paragraph,
The above-mentioned mountains and valleys are formed on the upper and lower surfaces of the above-mentioned film,
A shock absorbing structure in which a plurality of films are laminated so that the acid formed on the upper surface and the acid formed on the lower surface are in contact with each other.
In clause 8 or 9,
A shock absorbing structure in which the above multiple films are laminated inside a chamber and integrated by being heated and bonded by heat convected inside the chamber.
In clause 8 or 9,
A shock absorbing structure in which the above multiple films are pressurized by a pressurizing mechanism in a laminated state and joined together by heat and ultrasonic waves generated by the pressurizing mechanism.
In clause 8 or 9,
A shock absorbing structure in which the above multiple films are laminated, heated to a glass transition temperature, and pressed by a pressurizing device to bond and become an integral part.
In a method for manufacturing a shock absorbing structure, the shock absorbing structure described in claim 1 is manufactured,
The step of fixing the above film;
A step in which the surface of the above film is pressed by an external force;
A step of forming a plurality of grooves by moving an external force pressing the film along the width direction of the film,
The above external force is,
A method for manufacturing a shock-absorbing structure, the shock-absorbing structure being applied to the film by a mold having a grating edge inserted into the film.
In Article 13,
Further comprising a step of heating the above grating edge,
The step of heating the above grating edge is:
A method for manufacturing a shock absorbing structure, performed between the step of fixing the film and the step of forming the groove.
In a method for manufacturing a shock absorbing structure, the shock absorbing structure described in claim 1 is manufactured,
A step in which the above film begins to move from a start position to an end position;
A method for manufacturing a shock absorbing structure, comprising a step of forming a plurality of grooves as the surface of the film being moved is repeatedly pressed by an external force.
In Article 15,
The above external force is,
The film is acted upon by a mold having a flat edge inserted into the film,
A roll is positioned on the upper surface of the mold,
The above roll rotates in an eccentric state,
A method for manufacturing a shock absorbing structure in which the flat edge is inserted into the film surface and then moved from the inside of the surface to the outside of the surface as the roll rotates.
In Article 15,
The above external force is,
The film is acted upon by a mold having a flat edge inserted into the film,
A length-variable member whose length is repeatedly changed depending on the applied voltage is mounted on one side of the mold,
A method for manufacturing a shock absorbing structure, wherein, depending on a change in voltage applied to the length-variable member, the flat edge is inserted into the film surface and then moves from the inside of the surface to the outside of the surface.
In any one of Articles 13 to 17,
The above goal is,
A method for manufacturing a shock absorbing structure, wherein a plurality of shock absorbing structures are formed along a first direction on the surface of the film, and then a plurality of shock absorbing structures are formed along a second direction that is perpendicular to the first direction.
In any one of Articles 13 to 17,
It further includes a step of bonding and integrating the plurality of films in which the plurality of bones are formed.
At the above integration stage,
The above multiple films,
A method for manufacturing a shock absorbing structure that is laminated inside a chamber and heat-bonded by heat convecting inside the chamber.
In any one of Articles 13 to 17,
It further includes a step of bonding and integrating the plurality of films in which the above-mentioned bones are formed.
At the above integration stage,
The above multiple films,
A method for manufacturing a shock absorbing structure in which the layers are pressurized by a pressurizing device and bonded by heat and ultrasonic waves generated by the pressurizing device.
In any one of Articles 13 to 17,
It further includes a step of bonding and integrating the plurality of films in which the above-mentioned bones are formed.
At the above integration stage,
The above multiple films,
A method for manufacturing a shock-absorbing structure by bonding by heating to a glass transition temperature in a laminated state and applying pressure by a pressurizing device.