KR102019112B1 - Seat-back frame for automobile and method of manufacturing the same - Google Patents

Seat-back frame for automobile and method of manufacturing the same Download PDF

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Publication number
KR102019112B1
KR102019112B1 KR1020160003504A KR20160003504A KR102019112B1 KR 102019112 B1 KR102019112 B1 KR 102019112B1 KR 1020160003504 A KR1020160003504 A KR 1020160003504A KR 20160003504 A KR20160003504 A KR 20160003504A KR 102019112 B1 KR102019112 B1 KR 102019112B1
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Prior art keywords
frame
fiber
resin
fibers
long fiber
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KR1020160003504A
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Korean (ko)
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KR20170084725A (en
Inventor
길용길
이경훈
김권택
강용한
김희준
이태화
박상현
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(주)엘지하우시스
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14631—Coating reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B60N2/682—Joining means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Seats For Vehicles (AREA)

Abstract

Disclosed is a seat back frame for an automobile and a method of manufacturing the same, which can secure a high level of rigidity and impact strength and can be molded into a complicated shape by securing excellent moldability, and can improve the bonding force between the inner frame and the outer frame. do.
The automobile seatback frame according to the present invention is composed of a first fiber resin composite in which a long fiber composite including a first long fiber and a second thermoplastic resin is added to a continuous fiber composite including a reinforcing continuous fiber and a first thermoplastic resin. A built-in frame formed by press molding; And a second fiber resin composite material including a second long fiber and a third thermoplastic resin, wherein the outer frame is insert injection-molded to cover the outside of the inner frame.

Description

Seat back frame for automobile and manufacturing method thereof {SEAT-BACK FRAME FOR AUTOMOBILE AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a seat back frame for an automobile and a manufacturing method thereof.

The seatback frame is the basic skeleton of the seatback, which provides comfort and stability to the seated passengers, passengers and drivers by providing a comfortable and stable posture. There are a number of relevant legislation that require no deformation and breakage.

 In order to meet the regulations and to promote the safety of people, the seat back frame is formed of steel, but this causes a problem of increasing cost and weight. In particular, in the case of a vehicle, there is a problem in that driving performance and fuel efficiency are significantly reduced as the weight increases. In addition, if the armrest is included to provide more convenience for passengers and drivers, the seatback frame and the armrest frame are manufactured separately, and then a manufacturing process for welding them is added, which further consumes time and cost, resulting in increased productivity. And there is also a problem of low economic efficiency.

Therefore, the seat back frame is manufactured using a single material made of steel, GMT (glass mat thermoplastic), or long fiber reinforced thermoplastic resin, but it does not have sufficient stiffness and strength against external impact and must be formed thick and press formed. The degree of freedom of design was very low.

Related prior art documents include Korean Patent Laid-Open Publication No. 10-2014-0125577 (published on October 29, 2014), which discloses a seat back frame for a vehicle and a method of manufacturing the same.

It is an object of the present invention to secure a high level of stiffness and impact strength, but also to form a complex shape by securing excellent moldability, as well as an automobile seatback frame capable of improving the bonding force between the inner frame and the outer frame. It is to provide a manufacturing method.

Car seat back frame according to an embodiment of the present invention for achieving the above object is a long fiber composite material comprising a first long fiber and a second thermoplastic resin in a continuous fiber composite comprising a reinforcing continuous fiber and a first thermoplastic resin A built-in frame made of an added first fibrous resin composite and formed by press molding; And a second fiber resin composite material including a second long fiber and a third thermoplastic resin, wherein the outer frame is insert injection-molded to cover the outside of the inner frame.

Method for manufacturing a seat back frame for a vehicle according to an embodiment of the present invention for achieving the above object comprises (a) a first long fiber and a second thermoplastic resin in a continuous fiber composite comprising a continuous fiber and a first thermoplastic resin for reinforcement Molding the first fiber resin composite material to which the long fiber composite material is added by press molding to form an internal frame; And (b) insert-molding the second fiber resin composite including the second long fiber and the third thermoplastic resin to cover the outside of the inner frame to form an outer frame.

An automobile seat back frame and a method for manufacturing the same according to the present invention include a first fiber in which a long fiber composite including a first long fiber and a second thermoplastic resin is added to a continuous fiber composite including a reinforcing continuous fiber and a first thermoplastic resin. Since the internal composite frame is formed by press molding the resin composite material, it is possible to secure a high level of stiffness and impact strength and to secure excellent moldability through the addition of a long fiber composite material.

In addition, the seat back frame for a vehicle and the method for manufacturing the same according to the present invention are formed by insert injection molding using a second fiber resin composite made of a long fiber reinforced thermoplastic resin. Not only can it be possible, as the first long fiber of the inner frame and the second long fiber of the outer frame is made of the same material, it is possible to improve the bonding force between the inner frame and the outer frame.

As a result, in the case of the automobile seatback frame and the manufacturing method according to the present invention, the interior frame has a tensile strength of 150 ~ 400MPa and bending strength of 170 ~ 300MPa, the exterior frame has a tensile strength of 100 ~ 120MPa and 100 ~ 200MPa It has a bending strength of, and the interface bonding force between the inner frame and the outer frame has a 2.2 ~ 3.0kN bar, while having an appropriate level of tensile strength and bending strength, it is possible to improve the interface bonding between the inner frame and the outer frame.

In addition, the seat back frame for a vehicle and the method for manufacturing the same according to the present invention are manufactured as an integral type in which the internal frame is inserted into the interior of the exterior frame by insert injection molding. Since the attaching process is omitted, time and cost can be further reduced.

1 is a side cross-sectional view showing a seat back frame for a vehicle according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A of FIG. 1; FIG.
3 is a process flowchart showing a method for manufacturing a seat back frame for a vehicle according to an embodiment of the present invention.
4 to 5 is a process schematic diagram showing a method for manufacturing a seat back frame for a vehicle according to an embodiment of the present invention.
6 is a view for explaining a process of measuring the interfacial bonding force of the specimen according to Examples 1 to 6 and Comparative Example 1.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a seat back frame for a vehicle and a method of manufacturing the same according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In general, the seat back frame for automobiles is manufactured by press molding using a steel material or by press molding using a glass fiber mat thermoplastic material or a long fiber reinforced thermoplastic material among thermoplastic resin materials.

As described above, when a single material is formed, deformation or breakage occurs remarkably when an external shock is applied due to a collision of a vehicle, thereby causing a great danger to the safety of the seated occupant. In addition, in the case of press molding using a steel material, the thickness of the seat back frame should be almost constant and cannot be formed variably, such as becoming thicker or thinner, and it is difficult to form various appearances, resulting in poor design freedom.

In order to solve this problem, the seat back frame for an automobile according to an embodiment of the present invention is added to a continuous fiber composite including a reinforcing continuous fiber and a first thermoplastic resin, a long fiber composite including a first long fiber and a second thermoplastic resin After forming the interior frame by press molding the first fibrous resin composite, the exterior is formed by insert injection molding using the second fibrous resin composite including the second long fiber and the third thermoplastic resin. By fabricating the frame, it is possible to improve the bondability between the inner frame and the outer frame while further improving stability by realizing excellent stiffness and impact strength, and to improve the formability by molding the outer frame through insert injection molding. Various appearance can be expressed.

1 is a cross-sectional view illustrating a seat back frame for a vehicle according to an exemplary embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A of FIG. 1.

1 and 2, the seat back frame 100 for an automobile according to an exemplary embodiment of the present invention includes an interior frame 120 and an exterior frame 140.

The internal frame 120 is made of a first fiber resin composite in which a long fiber composite is added to the continuous fiber composite. In this case, the continuous fiber composite includes a continuous fiber 122 for reinforcement and the first thermoplastic resin 124, and the long fiber composite includes the first long fiber 126 and the second thermoplastic resin 128.

At this time, the continuous fiber composite material is preferably added in a content ratio of 30 to 70% by weight of the continuous fiber 122 for reinforcement continuously arranged in the inner frame 120, more preferably 55 to 65% by weight Can be presented. At this time, by including the reinforcing continuous fiber 122 in the content ratio within the above range, while realizing a high level of rigidity and impact strength at an appropriate cost to sufficiently protect the vehicle occupant from external impacts, while controlling the fluidity of the continuous fiber composites appropriately The press molding can be made easier. In addition, the weight of the interior frame 120 can be implemented at an appropriately low level to prevent deterioration of driving performance and fuel efficiency of the vehicle.

In addition, the continuous fiber composite material is preferably added to the first thermosetting resin 124 in a content ratio of 30 to 50% by weight, more preferably can present 35 to 45% by weight. By including the first thermoplastic resin 124 in an amount within the above range, the fluidity of the continuous fiber composite material may be appropriately adjusted to facilitate press molding, while sufficiently forming a predetermined shape by press molding.

On the other hand, the long fiber composite material is preferably added in the content ratio of 15 to 50% by weight of the first long fiber 126 having a fiber length of 2 to 100mm, more preferably can present 25 to 35% by weight. At this time, by including the first long fiber 126 in the content ratio within the above range, while being able to impart an appropriate level of stiffness and impact strength to the interior frame 120, while controlling the fluidity of the interior frame 120 appropriately press formability Can be made easier.

In addition, the long fiber composite is preferably added to the content ratio of 50 to 80% by weight of the second thermoplastic resin 128, more preferably 65 to 75% by weight can be presented. At this time, by including the second thermoplastic resin 128 in the content ratio within the above range, it is possible to implement the press molding more easily by appropriately adjusting the fluidity of the first fiber resin composite.

As such, the inner frame 120 is improved in formability in a continuous fiber reinforced thermoplastic (CFT) made of a continuous fiber 122 and a first thermoplastic resin 124 for reinforcement to improve strength and rigidity. And a first fiber resin composite to which a long fiber composite including a first long fiber 126 and a second thermoplastic resin 128 is added to improve bonding strength with the exterior frame 140 to be described later.

In general, when forming by press molding using a steel material, the structural rigidity of the molding can be improved because it is carried out under high pressure conditions, but it is difficult to form a variety of appearance, the design freedom is inferior.

In addition, the continuous fiber-reinforced thermoplastic resin effectively absorbs external impacts compared to the long-fiber-reinforced thermoplastic resin, and thus has higher rigidity and impact strength.However, the low fluidity makes it difficult to form a uniform surface when press molding. Due to the weak bonding force with the thermoplastic resin, it was vulnerable to external shocks during long-term use.

On the contrary, the seat back frame 100 for a vehicle according to an embodiment of the present invention may include a first long fiber 126 and a second long fiber 126 in a continuous fiber composite including a reinforcing continuous fiber 122 and a first thermoplastic resin 124. By adding the long fiber composite material including the thermoplastic resin 128, the press formability, which is a weak point of the continuous fiber reinforced thermoplastic resin, and the bonding force with the exterior frame 140 to be described later were improved.

In particular, the long fiber composite is preferably added in an amount of 10 to 40 parts by weight based on 100 parts by weight of the continuous fiber composite. When the addition amount of the long fiber composite material is less than 10 parts by weight with respect to 100 parts by weight of the continuous fiber composite material, the addition amount is insignificant, so that the press formability improvement effect of the interior frame 120 is insignificant, and with the exterior frame 140. Difficulties in obtaining the appropriate level of cohesion can be difficult. On the contrary, when the added amount of the long fiber composite material exceeds 40 parts by weight with respect to 100 parts by weight of the continuous fiber composite, the first long fiber 126 having good fluidity during press molding draws the continuous fiber for reinforcement in the molding process. To have a shape different from the design, which can lead to a problem of increasing the defective rate.

The outer frame 140 is made of a second fiber resin composite including a second long fiber 142 and a third thermoplastic resin 144 and is insert injection molded to cover the outside of the inner frame 120.

In the second fibrous resin composite, it is preferable to add the second long fiber 142 having a fiber length of 2 to 100 mm at a content ratio of 15 to 50% by weight, and more preferably 25 to 35% by weight. At this time, by including the second long fiber 142 in the content ratio within the above range can provide an appropriate level of stiffness and impact strength to the exterior frame 140, while appropriately adjusting the fluidity of the second fiber resin composite to more than injection molding It can be done easily.

In addition, the second fiber resin composite is preferably added to the third thermoplastic resin 144 in a content ratio of 50 to 80% by weight, and more preferably 65 to 75% by weight. At this time, by including the third thermoplastic resin 144 in the content ratio within the above range it is possible to sufficiently implement the shape of the seat back frame 100 to be implemented while making injection molding easier by properly adjusting the fluidity of the second fiber resin composite material. . At this time, the shape of the seat back frame 100 may be variously implemented according to the purpose and function of the invention, it is not particularly limited.

As described above, since the outer frame 140 is made of a second fiber resin composite composed of a second long fiber 142 and a third thermoplastic resin 144, that is, a long fiber reinforced thermoplastic (LFT), By performing insert injection molding, it may be possible to mold into a complex shape.

At this time, the seat back frame 100 for a vehicle according to an embodiment of the present invention is a first long fiber 126 and a second thermoplastic in a continuous fiber composite including a continuous fiber 122 for reinforcement and the first thermoplastic resin 124. Since the internal frame 120 is formed by press molding the first fibrous resin composite including the long fiber composite including the resin 128, it is possible to secure a high level of stiffness and impact strength while also providing a long fiber composite. It is possible to secure excellent moldability through the addition of.

In addition, the seat back frame 100 for an automobile according to an embodiment of the present invention is an outer frame 140 covering the outside of the inner frame 120 is also used for insert injection molding using a second fiber resin composite made of a long fiber reinforced thermoplastic resin. Because it is formed by, because it can be molded into a complicated shape, the first long fiber 126 of the inner frame 120 and the second long fiber 142 of the outer frame 140 is made of the same material Accordingly, the interfacial bonding force between the inner frame 120 and the outer frame 140 may be improved.

In addition, since the seatback frame 100 may be integrally manufactured in the form in which the internal frame 120 is inserted into the external frame 140 by insert injection molding, the internal and external frames 120 and 140 may be independently Since the step of attaching each other after manufacturing is omitted, it is possible to further reduce time and cost.

In this case, each of the first and second thermoplastic resins 122 and 128 of the interior frame 120 and the third thermoplastic resin 144 of the exterior frame 140 may be a polypropylene resin, a nylon resin, a polyethylene resin, or a polyamide resin. At least one material selected from polyester resins and polyphenylene sulfide resins may be used, but is not limited thereto.

In addition, the continuous fiber 122 for reinforcement of the inner frame 120 and the first long fiber 126 and the second long fiber 142 of the outer frame 140 are glass fibers, carbon fibers, aramid fibers, and natural fibers, respectively. At least one selected from polyester fibers and polyamide fibers may be used, but is not limited thereto.

At this time, the length of the continuous fiber 122 for reinforcement preferably has a length of 10 ~ 500cm, by having a length within the above range can implement a high level of rigidity and impact strength of the internal frame 120.

Preferably, the first and second long fibers 126 and 142 have a length of 2 to 100 mm, respectively, and have a length within the above range, so that the rigidity of the inner and outer frames 120 and 140 is appropriate to each other. And imparting impact strength and improving moldability in press molding and insert injection molding, thereby enabling molding into a complicated shape.

The seat back frame for an automobile according to the embodiment of the present invention described above is a first fiber having a long fiber composite including a first long fiber and a second thermoplastic resin to a continuous fiber composite including a reinforcing continuous fiber and a first thermoplastic resin. Since the internal frame is formed by press molding the fibrous resin composite, it is possible to secure a high level of stiffness and impact strength and to secure excellent moldability through the addition of the long fiber composite.

In addition, the seat back frame for an automobile according to an embodiment of the present invention is formed by insert injection molding using a second fiber resin composite made of a long fiber reinforced thermoplastic resin. Not only can it be possible, as the first long fiber of the inner frame and the second long fiber of the outer frame are made of the same material, it is possible to improve the bonding force between the inner frame and the outer frame.

As a result, in the case of the automobile seatback frame according to the embodiment of the present invention, the interior frame has a tensile strength of 150 ~ 400MPa and a bending strength of 170 ~ 300MPa, the exterior frame has a tensile strength of 100 ~ 120MPa and 100 ~ 200MPa It has bending strength and the interfacial bonding force between the inner frame and the outer frame is 2.2 ~ 3.0kN. The interfacial bonding force between the inner frame and the outer frame has a moderate tensile strength and bending strength, and the interface between the inner frame and the outer frame. The bonding force can be improved.

In addition, since the seat back frame for an automobile according to the embodiment of the present invention is manufactured as an integral type in which the internal frame is inserted into the interior of the exterior frame by insert injection molding, the interior and exterior frames are independently manufactured and then attached to each other. This eliminates the process, which further reduces time and cost.

Manufacturing method of seat back frame for automobile

3 is a process flowchart showing a method for manufacturing a seat back frame for a vehicle according to an embodiment of the present invention, Figures 4 to 5 is a process schematic diagram showing a method for manufacturing a seat back frame for a vehicle according to an embodiment of the present invention.

Referring to FIG. 3, the method for manufacturing a seat back frame for an automobile according to an exemplary embodiment of the present invention includes forming an interior frame by press molding (S210) and forming an exterior frame by insert injection molding (S220).

Built-in frame formation by press molding

As shown in Figure 3 and 4, in the forming of the internal frame by press molding step (S210) comprises a first long fiber and a second thermoplastic resin in a continuous fiber composite comprising a continuous fiber for reinforcement and the first thermoplastic resin The first fiber resin composite to which the long fiber composite is added is molded by press molding to form the internal frame 120.

As such, the interior frame 120 is formed of a continuous fiber reinforced thermoplastic (CFT) made of a continuous fiber and a first thermoplastic resin for reinforcement to improve strength and rigidity, and improves moldability and an exterior frame described later. It consists of a first fiber resin composite to which the long fiber composite including the first long fiber and the second thermoplastic resin is added in order to improve the bonding strength.

Accordingly, by adding a long fiber composite material including the first long fiber and the second thermoplastic resin to the continuous fiber reinforced thermoplastic resin composed of the continuous fiber for strengthening and the first thermoplastic resin, the press is a weak point of the continuous fiber reinforced thermoplastic resin. In addition to formability, it is possible to improve the bonding force with the outer frame to be described later.

At this time, it is preferable to perform press molding at 40-60 degreeC. By performing at a temperature within the above range it is possible to easily form a predetermined shape to be implemented by appropriately adjusting the press formability of the first fiber resin composite material can be prevented from sticking to the press die to reduce the raw material loss rate.

In addition, it is preferable to perform press molding on the pressure conditions of 100,000-300,000kgf / cm <2> . By performing press molding under the pressure within the above range, the predetermined shape of the built-in frame is sufficiently firmly implemented to further improve the structural rigidity, to provide excellent rigidity and impact strength, and to secure excellent moldability. can do.

Insert injection molding to form an outer frame

As shown in Figure 3 and 5, in the injection molding frame forming step (S220) in the insert injection molding insert the second fiber resin composite including the second long fiber and the third thermoplastic resin to cover the outside of the interior frame insert Molding forms an exterior frame.

As described above, since the outer frame is made of a second fiber resin composite composed of a second long fiber and a second thermoplastic resin, that is, a long fiber reinforced thermoplastic (LFT), a shape formed by insert injection molding It may be possible to mold with.

At this time, the insert injection molding is preferably carried out under a pressure condition of 50,000 ~ 300,000kgf / cm 2 . By insert injection molding under the pressure within the above range, the shape of the outer frame is sufficiently firmly formed, but the shape of the inner frame is not deformed, thereby maintaining a high level of structural rigidity even after the insert injection molding.

In addition, it is preferable to perform insert injection molding at 80-140 degreeC. If the insert injection molding temperature is less than 80 ℃ it may be difficult to ensure a sufficient coupling force between the inner frame and the outer frame during the insert injection molding process. On the contrary, when the insert injection molding temperature exceeds 140 ° C., the first and second long fibers having good fluidity attract and pull the reinforcing continuous fibers during the molding process, thereby increasing the defective rate as they have different shapes from the design. Can cause problems.

In this step, the inner frame and the outer frame can be manufactured integrally by insert injection molding. As such, when manufacturing the integrated frame in which the internal frame is inserted into the external frame by insert injection molding, a process of welding or combining the internal and external frames may be omitted, thereby reducing time and cost.

Example

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. Specimen Manufacturing

Example 1

Long fiber containing 25 wt% of long glass fiber (GF) and 75 wt% of polypropylene resin in 75 g of continuous fiber composite containing 60 wt% of continuous glass fiber (GF) and 40 wt% of polypropylene resin The first fiber resin composite to which 17 g of the composite material was added was press-molded under the conditions of 50 ° C. and 200,000 kgf / cm 2 to prepare a built-in frame.

Next, 40 g of the second fiber resin composite material including 30 wt% of long glass fiber (GF) and 70 wt% of polypropylene resin was subjected to insert injection molding under conditions of 100 ° C. and 100,000 kgf / cm 2 to form a T-shaped sheath. The frame was made.

Next, the T-shaped exterior frame was bonded to the interior frame in the vertical direction to prepare a seatback frame specimen.

Example 2

A sheetback frame specimen was prepared in the same manner as in Example 1, except that 27 g of a long fiber composite including 30 wt% of long glass fiber (GF) and 70 wt% of a polypropylene resin was added.

Example 3

A sheetback frame specimen was prepared in the same manner as in Example 1, except that 36 g of a long fiber composite including long glass fiber (GF) 35 wt% and a polypropylene resin 65 wt% was added.

Example 4

Long fiber containing 25 wt% of long glass fiber (GF) and 75 wt% of polypropylene resin in 75 g of continuous fiber composite containing 60 wt% of continuous glass fiber (GF) and 40 wt% of polypropylene resin The first fiber resin composite material to which 27 g of the composite material was added was press-molded under the conditions of 50 ° C. and 200,000 kgf / cm 2 to prepare a built-in frame.

Next, 25 g of the second fiber resin composite material including 25 wt% of long glass fiber (GF) and 75 wt% of polypropylene resin is insert-molded under the conditions of 100 ° C. and 100,000 kgf / cm 2 to form a T-shaped sheath. The frame was made.

Next, the T-shaped exterior frame was bonded to the interior frame in the vertical direction to prepare a seatback frame specimen.

Example 5

A sheetback frame specimen was prepared in the same manner as in Example 4, except that 55 g of the second fiber resin composite including 35 wt% of long glass fiber (GF) and 65 wt% of polypropylene resin was used.

Example 6

A sheetback frame specimen was prepared in the same manner as in Example 4, except that 70 g of the second fiber resin composite including 40 wt% of long glass fiber (GF) and 60 wt% of polypropylene resin was used.

Comparative Example 1

75 g of continuous fiber composites including 60 wt% of continuous glass fiber (GF) and 40 wt% of polypropylene resin were press-molded under the conditions of 50 ° C. and 200,000 kgf / cm 2 to prepare a built-in frame.

Next, an outer frame was manufactured by insert injection molding 40 g of a long fiber composite including 30 wt% of long glass fiber (GF) and 70 wt% of a polypropylene resin at 100 ° C. and 100,000 kgf / cm 2 .

2. Interfacial Bonding Force Measurement

Table 1 shows the results of measuring the interfacial bonding force for the specimens according to Examples 1 to 6 and Comparative Example 1, Figure 6 illustrates the process of measuring the interfacial bonding force of the specimens according to Examples 1 to 6 and Comparative Example 1 It is a figure for following.

1) Measurement of experimental value

Through the PULL-OFF experiment, the interfacial bond between the inner and outer frames of different materials was measured.

2) test method

As shown in FIG. 6, four holes H were formed in the interior frame 120 of the seatback frame specimen in which the T-shaped exterior frame 140 was bonded to the interior frame 120 in the vertical direction. Next, the fastening screws (not shown) are fixed in the four holes H to fix the internal frame 120, and then the external frame 140 is pulled upward to interface the interior frame 120 and the external frame 140. The binding force was measured. At this time, the T-shaped exterior frame 140 was used that the area bonded to the interior frame 120 is designed to 10 × 50mm.

TABLE 1

Figure 112016003094669-pat00001

As shown in Table 1, in the case of the specimens according to Examples 1 to 6 in which the interior frame was manufactured using the first fiber resin composite in which the long fiber composite was added to the continuous fiber composite, the interior frame using only the continuous fiber composite It can be seen that the interfacial bonding force was measured higher than the specimen according to Comparative Example 1 prepared.

At this time, as in the specimens according to Examples 1 to 6, the interfacial bonding force was measured to increase with the addition amount of the first long fiber or the second long fiber, it can be seen that the weight of the specimen also increases. Therefore, in the case of Example 2, in which the first and second long fibers were added at 30wt%, respectively, of the first and second fibrous resin composites, the specimen weight was 142g and the interfacial bonding force was 2.6kN. Confirmed.

3. Measurement of tensile strength and bending strength

Table 2 shows the tensile strength and bending strength measurement results for the specimens according to Examples 1 to 6 and Comparative Examples 1 and 2.

1) tensile strength

It measured according to ASTM D638.

2) bending strength

It measured according to ASTM D790.

TABLE 2

Figure 112016003094669-pat00002

As shown in Table 2, in the case of the specimens according to Examples 1 to 6, it was confirmed that the tensile strength and the bending strength of the inner frame and the outer frame satisfy all of the target values.

On the other hand, in the case of the specimen according to Comparative Example 1, the outer frame has the same tensile strength and bending strength as in Example 1, but it can be seen that the inner frame is measured at a considerably higher value than Example 1, thereby forming It was confirmed that there was difficulty in securing.

Although the above has been described with reference to the embodiments of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications can be said to belong to the present invention without departing from the scope of the technical idea provided by the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

100: car seat back frame 120: built-in frame
122: continuous fiber for reinforcement 124: first thermoplastic resin
126: first long fiber 128: second thermoplastic resin
140: outer frame 142: second long fiber
144: third thermoplastic resin
S210: step of forming internal frame by press molding
S220: forming the outer frame by insert injection molding

Claims (14)

An inner frame formed of a first fiber resin composite in which a long fiber composite including a first long fiber and a second thermoplastic resin is added to a continuous fiber composite including a reinforcing continuous fiber and a first thermoplastic resin; And
And a second fiber resin composite material including a second long fiber and a third thermoplastic resin, wherein the outer frame is insert injection molded to cover the outer side of the inner frame.
Each of the continuous fibers for reinforcement and the first and second long fibers include at least one selected from glass fibers, carbon fibers, aramid fibers, natural fibers, polyester fibers, and polyamide fibers,
The first long fiber of the inner frame and the second long fiber of the outer frame is made of the same material, the interface between the inner frame and the outer frame has a coupling force of the vehicle having a frame of 2.2 ~ 3.0kN.
The method of claim 1,
Each of the first, second and third thermoplastic resins
An automobile seat back frame comprising at least one selected from polypropylene resin, nylon resin, polyethylene resin, polyamide resin, polyester resin and polyphenylene sulfide resin.
delete The method of claim 1,
The long fiber composite is
Car seat back frame is added in an amount of 10 to 40 parts by weight based on 100 parts by weight of the continuous fiber composite material.
The method of claim 1,
The length of the continuous fiber for reinforcement
Car seat back frame with 10 ~ 500cm.
The method of claim 1,
The length of the first and second long fibers, respectively
Car seatback frame with 2 to 100mm.
The method of claim 1,
The built-in frame
Automotive seatback frame with tensile strength between 150 and 400 MPa and bending strength between 170 and 300 MPa.
The method of claim 1,
The outer frame
Automotive seatback frame with a tensile strength of 100 to 120 MPa and a bending strength of 100 to 200 MPa.
delete (a) a first fiber resin composite, in which a long fiber composite including a first long fiber and a second thermoplastic resin is added to a continuous fiber composite including a continuous fiber for reinforcement and a first thermoplastic resin, and molded by pressing Forming a; And
and (b) insert-molding a second fibrous resin composite including a second long fiber and a third thermoplastic resin to cover an outer side of the inner frame to form an outer frame.
Each of the continuous fibers for reinforcement and the first and second long fibers include at least one selected from glass fibers, carbon fibers, aramid fibers, natural fibers, polyester fibers, and polyamide fibers,
The first long fiber of the interior frame and the second long fiber of the exterior frame is made of the same material, the interface bonding force between the interior frame and the exterior frame has a 2.2 ~ 3.0kN automotive seat back frame manufacturing method.
The method of claim 10,
In the step (a),
The press molding
Car seat back frame manufacturing method carried out at 40 ~ 60 ℃.
The method of claim 11,
The press molding
A method for producing a seat back frame for an automobile carried out under a pressure condition of 100,000 ~ 300,000kgf / cm 2 .
The method of claim 10,
In step (b),
The insert injection molding
Car seat back frame manufacturing method carried out at 80 ~ 140 ℃.
The method of claim 13,
The insert injection molding
A method for manufacturing a seat back frame for an automobile carried out under a pressure condition of 50,000 to 300,000 kgf / cm 2 .
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