WO2014025138A1

WO2014025138A1 - Method for manufacturing vehicle side impact bar

Info

Publication number: WO2014025138A1
Application number: PCT/KR2013/005670
Authority: WO
Inventors: 이규세; 김영민; 오승민; 양동수
Original assignee: 주식회사 일광; 주식회사 에이에프에프씨
Priority date: 2012-08-10
Filing date: 2013-06-27
Publication date: 2014-02-13
Also published as: KR101435193B1; KR20140021448A

Abstract

The aim of the present invention is to provide a high quality and highly productive method for manufacturing a vehicle side impact bar using a composite material. In order to achieve said aim, the method according to the present invention for manufacturing a vehicle side impact bar using a composite material and a synthetic resin includes: a composite material cutting step in which a composite material fabric is cut to a desired shape; a composite material preheating step in which the cut composite material is preheated for pre-forming; a composite material pre-forming step in which the preheated composite material is put into a pre-forming mold of a mold system which comprises the pre-forming mold, a mold core, and a forming mold; a mold rotation step in which the mold core is rotated for injection molding the pre-formed composite material; an injection molding step in which a resin is fed into the mold so as to produce a base surrounding the composite material, and an ejection step in which the injection molded impact bar is ejected.

Description

How to make side impact bars for cars

The present invention relates to a method for manufacturing a side impact bar for automobiles, and more particularly, to a method for manufacturing a side impact bar for automobiles having high quality and high production efficiency using a composite material.

The impact bar for automobiles is a structure that is mounted inside the car door, which increases the rigidity of the vehicle and absorbs the shock applied to the occupant, especially in the event of a side collision.

For example, as disclosed in Korean Patent No. 207048, an impact bar installed inside a door including a support having an integral cross section made of pipe and fixing parts formed at both ends of the support, wherein both ends of the impact bar are fixed. The support part formed between the first support part and the second support part is formed in a double section, and the support part of the impact bar installed inside the door has a double cross-sectional structure, so that the rigidity of the impact bar itself is reinforced, so that the rigidity of the door is supported. And impact resistance is improved, and when the impact is applied to the door, the impact bar supports and supports the door more firmly, effectively preventing shock from being transmitted into the cabin, reducing deformation and damage, and keeping passengers in the cabin safe from collision. It provides a protective effect.

In addition, as disclosed in Korean Patent No. 424745, the side of the impact bar is provided with a shock absorbing structure of the side door that can prevent the impact bar from entering the room due to the impact when a side collision occurs in the side door, In a side door of a vehicle composed of an impact bar fixed between a panel and an inner panel, a shock absorbing member provided on an outer side of the inner panel, and a door trim mounted on the inner panel, at a position corresponding to the position at which the shock absorbing member is installed. As the wing portion bent toward the inside of the vehicle is provided and the impact dispersion bracket welded to the impact bar is mounted, the impact amount of the impact bar is transmitted to the shock absorbing member through the impact dispersion bracket so that the concentrated load is generated on the shock absorbing member. To ensure the safety of the passengers Provides an effective effect.

Impact bars having the above characteristics are usually manufactured on the basis of metals, especially steel, and are manufactured through a rather complicated process such as cutting, bending, welding, and the like.

On the other hand, current automotive parts have been continuously improved to improve fuel efficiency and lower manufacturing costs, and in the case of structures, many studies have been conducted on the application of composite materials having sufficient rigidity.

In particular, the impact bar is a component that absorbs the shock applied to the vehicle without being exposed to the outside of the vehicle, and thus, it is expected that the impact bar may contribute to the weight reduction of the vehicle when manufactured using the composite material. .

However, since composite materials are more complicated to manufacture and different types of materials are mixed, it is difficult to replace impact bars using metal materials, which requires a method of manufacturing impact bars made of a new method of high productivity and high quality composite materials. It is true.

An object of the present invention is to provide a method for manufacturing a vehicle side impact bar having a high quality and high productivity by using a composite material to overcome the disadvantages of the conventional metal impact bar as described above.

In order to achieve the above object, the present invention is a method for manufacturing a side impact bar for automobiles using a composite material and synthetic resin, the composite material cutting step of cutting the composite material to the required size; A composite preheating step of preheating the cut composite material for preforming; A composite material preforming step of preforming the preheated composite material into a preforming mold in a mold system consisting of a preforming mold, a mold core, and a molding die; A mold rotation step of rotating the mold core for injection molding the preformed composite material; It is characterized in that it comprises an injection molding process for producing a base surrounding the composite material by injecting the resin through the molding die and a take-out process for taking out the impact bar is completed injection molding.

Preferably, the composite fabric is a prepreg impregnated with a thermoplastic resin PA, PP in one or more selected from glass fiber, carbon fiber and aramid fiber in the form of plain weave, twill, runner weave or uni-direction It is characterized by the form.

Preferably, in the composite material preforming process, the composite material is pressed at a pressure of 10 bar to 20 bar, and cooled for 30 to 60 seconds.

Preferably, the resin of the injection molding process is a composite resin in which GF, CF, etc., which are roving fibers, are compounded in a raw material in the form of a pallet such as PP or PA.

Preferably, the injection molding process forms a first injection space between the mold core and the molding die, and retracts the molding die after the first injection and the first injection to inject the second injection space between the mold core and the molding die. Forming a further, characterized in that it comprises a secondary injection to fill the resin into the second injection space.

Preferably, the injection molding process is carried out simultaneously with the composite material preforming process of the next operation.

The method of manufacturing a side impact bar for a vehicle according to the present invention improves the complexity of a conventional method of manufacturing a side impact bar made of metal, and provides an effect of manufacturing a side impact bar of a non-metal type using a composite material or the like.

In addition, when the impact bar manufactured according to the manufacturing method of the present invention is applied to a vehicle, the vehicle can be lighter in weight and provides an effect of improving fuel efficiency.

1 is a front view illustrating the shape of an impact bar for applying the method of the present invention,

2 is a flowchart illustrating a method of manufacturing a side impact bar for a vehicle according to the present invention;

3 is a block diagram of a mold system applied to the method of FIG.

4 is a configuration diagram of the mold arrangement in the composite material preforming process of FIG.

5 is a configuration diagram illustrating the mold rotation of FIG. 1;

FIG. 6 is a mold arrangement configuration illustrating the injection molding of FIG. 1;

7 is another mold arrangement configuration illustrating the injection molding of FIG. 1,

It is a metal mold | die arrangement structure explaining the extraction process of FIG.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

Method for manufacturing a side impact bar for a vehicle according to the present invention is a method for manufacturing the impact bar 10 as shown in Figure 1, the impact bar 10 is configured for the description of the present invention, the specific configuration is different can do.

The impact bar 10 is composed of two materials, and the overall configuration is a structure in which the composite material 2 is inserted in the middle of the base 1 based on the base 1, and in particular, the composite material 2 is whole. It plays a very important role in reinforcing the strength of the impact bar (10).

Vehicle side impact bar manufacturing method according to the invention as shown in Figure 2, the composite material cutting step (S1), composite material preheating step (S2), composite material preforming step (S3), mold rotation step (S4) And an injection molding step (S5) and a take-out step (S6).

First, the composite material cutting process (S1) is a process of cutting the composite material to the required size.

Here, the composite fabric is preferably a prepreg form impregnated with thermoplastic resin PA and PP in one or more selected from glass fibers, carbon fibers, and aramid fibers in a plain weave, twill weave, main weave or uni-direction fabric. .

The composite material 2 cut in the composite material cutting step S1 is subjected to a composite material preheating step S2 that is preheated by a preheating device.

The composite material preheating step (S2) is preferably carried out for about 2 to 3 minutes between 200 ~ 300 ℃, the preheating device may be any device used for conventional composite preheating, IR-heater is preferred. .

The composite material 2 preheated by the composite material preheating step S2 is introduced into the mold system 20 shown in FIG. 3, and then the process is performed.

The mold system 20 includes a preforming mold 21, a mold core 22, and a molding mold 23, and the preforming mold 21 and the molding mold 23 may move back and forth, The mold core 22 is rotatable.

In addition, the molding die 23 includes a through hole 24 through which the molten compounding moves into the molding die 23, and a nozzle 25 supplying compounding to the through hole 24.

The mold core 22 may be rotated by 180 ° as necessary to perform a preforming or molding process, and the surface of the mold core 22 may correspond to the preforming mold 21 and the molding mold 23, respectively. The mold of the same form is formed.

Here, the preforming mold 21 is a space for pressing the composite material 2 when the mold core 22 is coupled, the molding die 23 is coupled to the mold core 22. Since the space for forming the seam base 1 is formed and the two show a difference only in forming the mold space, the space can be controlled by adjusting the moving distance between the preforming mold 21 and the molding mold 23. The form of can be configured in the same way.

On the other hand, when the composite material preheating step (S2) is completed, the composite material preforming step (S3) is carried out by putting the preheated composite material 1 into the preforming mold 21 and preformed.

In the composite material preforming step (S3), as shown in FIG. 4, the composite material 2 is introduced into the preform mold 21, and the preform mold 21 is moved to move the mold core 22. Combine with

In addition, the preforming die 21 is pressurized and cooled, wherein the pressing force is 10 bar to 20 bar and the cooling time is about 30 seconds to 60 seconds.

If the pressing force is less than 10bar, the molding of the composite material 2 is not performed properly, and if the pressing force is more than 20bar, there may be a problem in the material.

In addition, when the cooling time is less than 30 seconds, there may be a problem due to high temperature in the next process of the composite material (2). It may occur.

In the process conditions, the preheated composite material 2 is molded into an appropriate shape, and then serves as a structure inside the side impact bar 10.

After the composite material preforming step S3 is completed, a mold rotation step S4 is performed.

The die rotation step S4 is a step for positioning the composite material 2 in the molding die 23 by rotating the die core 22.

When the preforming step S3 is completed, the preforming mold 21 is retracted to open the mold, and as shown in FIG. 5, the mold core 22 is then rotated to 180 ° to form a mold core. The composite material 2 attached to the (22) is positioned to face the molding die 23.

After the mold rotation process S4 is performed, an injection molding process S5 is performed.

In the step S5, as shown in FIG. 6, the molding die 23 is advanced to form a first injection space 26 between the mold core 22 and the molding die 23.

Thereafter, the resin is first injected through the nozzle 25 to fill the first injection space 26 with the resin.

Subsequently, as shown in FIG. 7, the molding die 23 is retracted to form the second injection space 27, and then the resin is secondly injected through the nozzle 25 to the second injection space 27. The remaining resin is filled in to complete the base 1 portion of the side impactor bar 10, and then cooled for about 1 minute to complete the injection molding step (S5).

Here, since the composite material 2 is attached to the resin after the first injection, when the molding die 23 is retracted, the molding die 23, the resin, and the composite material 2 simultaneously move to the second injection space. (27) is naturally formed.

The resin used in the injection molding process (S5) may be used as a raw material in the form of a pallet, such as PP, PA, but GF, CF, etc., which is a roving fiber for improving the strength of the base 1 is compounded It is preferable to use a composite resin.

When the injection molding process S5 is completed, the extraction process S6 is performed.

As shown in FIG. 8, the ejection step S6 is performed by cooling the side impact bar 10 in which injection is completed and then retreating the molding die 23 to discharge the impact bar 10. Is done.

In particular, the method of manufacturing a side impact bar for a vehicle according to the present invention is configured to control the structural features of the mold core 22 of the mold system 20 and the preformed mold 21 and the molding die 23 separately, Since there is an advantage that the pre-molding process (S3) and the injection molding process (S5) can be performed at the same time, there is an effect that can reduce the production time of the impact bar 10, the impact bar of various shapes according to the shape of the mold There is also an advantage that (10) can be manufactured precisely.

While the invention has been shown and described with respect to certain preferred embodiments, the invention is not limited to these embodiments, and those of ordinary skill in the art claim the invention as claimed in the appended claims. It includes all embodiments of the various forms that can be carried out without departing from the spirit.

Claims

In the method of manufacturing a side impact bar for automobiles using composite materials and synthetic resins,

Composite material cutting process for cutting the composite material to the required size;

A composite preheating step of preheating the cut composite material for preforming;

A composite material preforming step of preforming the preheated composite material into a preforming mold in a mold system consisting of a preforming mold, a mold core, and a molding die;

A mold rotation step of rotating the mold core for injection molding the preformed composite material;

An injection molding process of generating a base surrounding the composite material by injecting a resin through the molding die;

Method for producing a side impact bar for automobiles, characterized in that it comprises a take-out step of taking out the impact bar is completed injection molding.
The method of claim 1, wherein the composite fabric is a glass fiber, carbon fiber and aramid fiber, one or more selected from plain weave, twill, runner weave or uni-direction type fabric impregnated with thermoplastic resin PA, PP Method for producing a side impact bar for cars, characterized in that the leg form.
The method of claim 1, wherein the composite material is pressurized to a pressure of 10 bar to 20 bar in the preform molding process, and cooled for 30 seconds to 60 seconds.
The method of claim 1, wherein the resin of the injection molding process is a side impact bar for automobiles, characterized in that the composite resin compounded with GF, CF, such as roving fiber (roving fiber) in the raw material of the pallet form, such as PP, PA Way.
The method of claim 1, wherein the injection molding process forms a first injection space between the mold core and the molding die, and the second injection between the mold core and the molding die by retreating the molding die after the first injection and the first injection. A method of manufacturing a side impact bar for a vehicle, further comprising: forming a space and filling the second injection space with a resin.
The method of claim 1, wherein the injection molding process is performed simultaneously with a composite material preforming process of a next operation.