KR101675777B1

KR101675777B1 - Forming apparatus for helmet shell

Info

Publication number: KR101675777B1
Application number: KR1020150050434A
Authority: KR
Inventors: 허원욱; 김석래
Original assignee: 주식회사 이노컴텍
Priority date: 2015-04-09
Filing date: 2015-04-09
Publication date: 2016-11-14
Also published as: KR20160121041A

Abstract

The present invention discloses a helmet molding apparatus for a vehicle which can form a helmet in a state in which air remaining between a mold and a helmet forming material is completely removed. A helmet forming apparatus for a vehicle comprises an inner mold formed by a synthetic resin to have elasticity and having a helmet molding material adhered to an outer surface thereof, an outer mold disposed to be spaced apart from the inner mold so as to surround the molding material, A decompression unit which receives the outer mold, removes between the inner mold and the outer mold, and maintains the inner pressure of the inner mold lower than the atmospheric pressure; And a mold pressurizing unit for injecting compressed air into the interior of the inner mold to expand the inner mold.

Description

[0001] FORMING APPARATUS FOR HELMET SHELL [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a helmet molding apparatus for a vehicle, and more particularly, to a helmet molding apparatus for a vehicle. More particularly, Shaped helmet can be easily manufactured.

Generally, a helmet is worn by a driver or a worker to prevent damage to the head caused by an accident when driving a motorcycle, a bicycle, a racing car, or a construction site.

Such a helmet includes a main body made of a fiber-reinforced composite material made of a high-strength fiber such as glass fiber, carbon fiber, aramid fiber, or spectra fiber and a thermosetting resin, And a cushion pad attached to the inner surface.

In order to manufacture the main body of the helmet, a left and right mold having a shape of a main body is provided, and a reinforcing fiber mat or a reinforcing fiber fabric such as glass fiber, Kevlar fiber, carbon fiber or the like is laminated between the molds, A thermosetting resin such as an epoxy resin, an unsaturated polyester, a vinyl ester, or phenol, or a thermoplastic resin such as polyamide, polybutylene terephthalate, ABS, polyphenylene sulfide, or polypropylene is injected into the mold, And is molded under pressure with an air bag formed with an injection tube.

However, in the conventional helmet manufacturing method described above, when the shape of the mold is complicated, it is difficult to accurately mold the main body according to the shape of the mold, resulting in a large number of defects, and a complicated main body can not be manufactured.

Therefore, there is a need to improve this.

Korean Patent Laid-Open No. 10-2002-0020071 (published on Mar. 14, 2002, name: Method and apparatus for manufacturing helmet body) Korean Registered Utility Model No. 20-0323443 (Registered: 2003.08.04, Name: Shell molding device for helmet body)

It is an object of the present invention to provide a helmet molding apparatus for a vehicle which can accurately form a helmet to reduce a defect rate and easily and accurately manufacture a helmet having a more complicated shape.

According to an aspect of the present invention, there is provided an automotive helmet molding apparatus including: an inner mold formed of silicon having elasticity and heat resistance and having a helmet molding material adhered to an outer surface thereof; An outer mold disposed to be spaced apart from the inner mold so as to surround the molding material and having an air vent hole; A decompression unit that receives the outer mold, removes the air between the inner mold and the outer mold, and maintains the inner air pressure lower than atmospheric pressure; And a mold pressurizing unit that expands the inner mold by injecting compressed air into the inner mold.

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Further, the depressurization portion may include a vacuum space member in which the inner air is discharged to the outside when the outer mold is accommodated; And a chamber member for accommodating the vacuum space member.

Further, the decompression unit is characterized in that the vacuum space member is continuously decompressed while the chamber member is depressurized.

Also, the mold pressing portion may include: a pneumatic tube positioned inside the inner mold; A compressor for supplying compressed air to the pneumatic tube; A pneumatic line connecting the pneumatic tube and the compressor; And an open / close valve disposed on the pneumatic line.

In addition, the mold pressurizing unit hits the inner mold while the compressed air is repeatedly applied to the pneumatic tube in a state where the pneumatic tube presses the inner mold.

Also, the depressurizing portion is characterized in that an inner temperature is maintained at 100 to 130 degrees when the mold pressurizing portion presses the inner mold.

As described above, according to the helmet molding apparatus for a vehicle according to the present invention, unlike the prior art, the prepreg laminate as the molding material of the helmet is struck by the mold in the vacuum state, so that the air remaining between the mold and the molding material is completely It is possible to accurately form the shape of the helmet and to easily manufacture the helmet while reducing the defect rate when the helmet of a complex shape is manufactured.

In addition, according to the helmet molding apparatus for a vehicle according to the present invention, the inner mold is struck by using a pneumatic tube located inside the inner mold, which is a heat resistant silicon material having a helmet shape, .

1 is a cross-sectional view illustrating a helmet molding apparatus for a vehicle according to an embodiment of the present invention.
2 is a cross-sectional view illustrating an operating state of a helmet forming apparatus for a vehicle according to an embodiment of the present invention.
3 is a perspective view illustrating a helmet molded by a helmet molding apparatus for a vehicle according to an embodiment of the present invention.
4 is a flowchart illustrating a process for manufacturing a helmet using a helmet forming apparatus for a vehicle according to an embodiment of the present invention.
5 is a perspective view showing a laminated prepreg laminated sheet used in a helmet molding apparatus for a vehicle according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a helmet molding apparatus for a vehicle according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a sectional view showing a helmet forming apparatus for a vehicle according to an embodiment of the present invention, FIG. 2 is a sectional view showing an operating state of the helmet forming apparatus for a vehicle according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating a helmet molded by a helmet molding apparatus for a vehicle according to an embodiment of the present invention. FIG.

FIG. 4 is a flowchart illustrating a process for manufacturing a helmet using the helmet forming apparatus for a vehicle according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of a prepreg laminated sheet for use in a helmet forming apparatus for a vehicle according to an embodiment of the present invention. As shown in Fig.

1 to 3, the automotive helmet forming apparatus 100 according to the present embodiment includes an inner mold 110 to accurately and easily form a complex helmet 30, An outer mold 120, a depressurizing portion 130, and a mold pressurizing striking portion 140.

The inner mold 110 is formed of silicon having elasticity and heat resistance so as to have an elastic force, and a prepreg laminated sheet 20, which is a material for molding the helmet 30, is attached to the outer surface of the inner mold 110. The inner mold 110 according to the present embodiment may be formed of silicon having heat resistance. The inner mold 110 is covered with the outer mold 120 in a state where the prepreg laminated sheet 20 is attached.

The outer mold 120 is divided into right and left parts and joined together by bolts and nuts. The inner mold 110 is located inside the outer mold 120 and the support plate 121 is provided at the lower end to support the presser 140. Further, when the outer mold 120 is subjected to the pressure reduction treatment by the decompression portion, the air discharge fine holes 123 are formed so that the air existing between the prepreg laminated sheet 20 and the inner surface can be completely removed. The air vent micropores 123 according to the present embodiment are formed so that the diameter of the air vent micropores 123 is in the range of 0.1 mm to 1 mm so as to prevent the prepreg laminate sheet 20 from being introduced when the prepreg laminate sheet 20 is pressed by the inner mold 110. [ 0.05 mm.

The air between the outer mold 120 and the prepreg laminated sheet 20 is discharged to the outside by the pressure- For example, in the helmet molding apparatus 100 for a vehicle according to the present embodiment, when the inner mold 110, the prepreg laminated sheet 20, and the outer mold 120 are depressurized by the decompression unit 130, The air layer between the outer mold 120 and the prepreg laminated sheet 20 is completely removed.

Accordingly, when the helmet 30 is molded by pressing the prepreg laminated sheet 20, the pattern formed on the outer surface of the helmet 30 can be finely formed, and the fine pattern can be formed more accurately . In addition, since the prepreg laminated sheet 20 is compressed more than at atmospheric pressure, the strength of the helmet 30 can be improved.

More specifically, the depressurizing unit 130 receives the outer mold 120, maintains the air pressure between the inner mold 110 and the outer mold 120 at a lower pressure than the atmospheric pressure, and pressurizes the prepreg laminated sheet 20 The air of the inner mold 110 and the outer mold 120 is continuously discharged to the outside.

The decompression unit 130 according to the present embodiment includes a vacuum blank member 131 in which the outer mold 120 is accommodated and a chamber member 133 for accommodating the vacuum blank member 131. The vacuum hollow member 131 is connected to the vacuum pump 131b through the air discharge line 131a to discharge the air therein. The inside of the chamber member 133 is kept in a vacuum state in a state where the vacuum space member 131 is accommodated. In addition, the chamber member 133 has a shelf (not shown) in which a vacuum space member 131 is placed.

The depressurization unit 130 according to the present embodiment is configured such that the vacuum pump 131b is operated while the chamber member 133 is depressurized to a vacuum state so that the air layer between the outer mold 120 and the inner mold 110 can be completely removed. The vacuum blanking member 131 is also continuously decompressed.

Meanwhile, the chamber member 133 maintains the internal temperature of the helmet 30 at 100 to 130 degrees while the helmet 30 is being molded. This is for the purpose of smoothly progressing deformation and compression of the prepreg laminated sheet 20 when the helmet 30 is formed.

The mold pressurizing striking unit 140 injects compressed air into the interior mold 110 to expand the inner mold 110 to be adhered to the prepreg laminated sheet 20 and to press the inner mold 110 through the compressed air, And presses the inner mold 110 repeatedly.

The mold pressing part 140 according to the present embodiment includes a pneumatic tube 141 located inside the inner mold 110, a compressor 143 for supplying compressed air to the pneumatic tube 141, A pneumatic line 145 connecting the pneumatic tube 141 and the compressor 143 and an on-off valve 147 disposed on the pneumatic line 145.

The pneumatic tube 141 is provided with a grommet 141a which is coupled to the outer mold 120 at the lower end thereof so that expansion and compressed air are repeatedly supplied by the compressor 143 and the expansion thereof is stabilized. In the grommet portion 141a, a coupling groove 141b into which the support plate 121 is inserted is formed.

The mold pressurizing hitting portion 140 selectively opens and closes the on-off valve 147 while the pneumatic tube 141 is expanded and is in close contact with the inner mold 110 so that the compressed air of the compressor 143 is pneumatically connected to the pneumatic tube 141 . Accordingly, the pneumatic tube 141 repeatedly strikes the inner mold 110, so that the thickness of the helmet 30 can be made thinner and the strength and durability can be improved.

On the other hand, the prepreg is an abbreviation of 'Preimpregnated Materials' in English. It is a product in the form of a sheet in which a matrix is pre-impregnated in Reinforced Fiber. As a intermediate material of the composite material, Quot; refers to an intermediate product in which a thermosetting resin is infiltrated into a semi-cured state. At this time, carbon fiber, glass fiber, aramid fiber and the like are mainly used as the reinforcing fiber, and an epoxy resin, a polyester resin, a thermoplastic resin and the like are used as a binder

1 to 5, a manufacturing process of a helmet according to an embodiment of the present invention will be described.

First, a prepreg sheet 10 for producing a prepreg laminated sheet 20 is formed (S10), and a prepreg sheet 10 is laminated to form a prepreg laminated sheet 20. The first compression step (S30) in which the prepreg laminated sheet 20 is placed on the inner mold 110 and the pneumatic tube 141 is expanded to compress the prepreg laminated sheet 20 is carried out, 141 repeatedly apply compressed air to continue the second compression step (S40) in which the inner mold 110 is repeatedly blown. Thereafter, the helmet 30 compression-molded by the prepreg laminated sheet 20 is demolded from the mold (S50).

In the prepreg sheet forming step S10, reinforcing fibers of carbon or glass fiber are placed in a rectangular frame, and a binder of an epoxy resin and a flame retardant resin is injected into the frame to impregnate the reinforcing fiber with a binder.

In the prepreg sheet forming step S10, the prepreg sheet 10 is fabricated to include 55 to 60% of reinforcing fibers and 40 to 45% of binder. If the content of the binder is less than 40%, the prepreg sheet 10 is not smoothly bonded due to the evaporation of the binder in the process of heating and pressing the prepreg laminated sheet 20, Durability is lowered.

In addition, if the content of the binder exceeds 45%, it takes a long time to cure the helmet 30, the strength of the helmet 30 is reduced, and it is very difficult Lt; / RTI >

In the prepreg lamination step S10, the binder includes epoxy, a solvent, and an inorganic flame retardant. Specifically, it includes 30 to 50% by weight of epoxy, 30 to 50% by weight of solvent, and 5 to 30% by weight of inorganic flame retardant.

If the content of epoxy is less than 30% by weight, the viscosity is low and the curing time becomes long after the impregnation, and the epoxy flows down due to viscosity. When the content exceeds 50% by weight, the viscosity is too high, The coagulation occurs and impregnation does not occur smoothly.

The solvent may be any one or a mixture of two or more selected from acetone, dimethylformamide, methyl ethyl ketone, and tetrahydrofuran. When the content of the solvent is less than 30% by weight, the viscosity is high and the aggregation does not occur when the inorganic fiber is impregnated with the inorganic fiber. When the content exceeds 50% by weight, the viscosity is too low to cause the resin to flow during curing after impregnation.

If the content of the flame retardant is less than 5% by weight, the flame retardant effect is not exhibited. If the content exceeds 30% by weight, aggregation of the particles occurs and the flame retardancy is lowered.

In the prepreg laminated sheet forming step S20, two or more prepreg sheets 10 manufactured as described above are laminated. In the prepreg laminated sheet forming step (S20), the thickness of the prepreg laminated sheet (20) is reduced, and the prepreg laminated sheet (20) is preliminarily compressed using a press to facilitate handling and use.

In the first compression step S30, the prepreg laminated sheet 20 is covered with the outer mold 120 in a state where the prepreg laminated sheet 20 is placed on the inner mold 110. After the outer mold 120 is inserted into the vacuum chamber member 131 and the vacuum chamber member 131 is introduced into the chamber member 133, the chamber member 133 is vacuum- Thereby discharging the air inside the member 131 to the outside. The inside of the chamber member 133 is heated to 100 to 130 degrees and then the pneumatic tube 141 is expanded to press the prepreg laminated sheet 20 with the inner mold 110. At this time, the prepreg laminated sheet 20 is held in a compressible state by the heat of the chamber member 133, so that the helmet 30 can be molded.

Thereafter, the second compression step S40 is further performed so that the helmet 30 is more accurately shaped in accordance with the outer surface of the inner mold 110 and the inner surface of the outer mold 120, and a detailed portion can be formed.

In the second compression step (S40), compressed air is repeatedly applied to the pneumatic tube (141) expanded by pneumatic pressure to hit the inner mold (110) with compressed air. All portions of the prepreg laminated sheet 20 which are not completely and tightly adhered to the inner mold 110 and the outer mold 120 by the expansion of the pneumatic tube 141 are completely adhered and pressed together. Therefore, not only can the helmet 30 be manufactured more accurately, but also a complicated surface can be produced. At this time, the blowing of the inner mold 110 using the air pressure is performed about 5 times to 30 times according to the shape and the complexity of the helmet 30.

After the inner mold 120 is blown using the air pressure and the molding of the helmet 30 is completed, the compression molded helmet 30 is demolded from the mold (S50).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

10: prepreg sheet 20: prepreg laminated sheet
30: Helmet 100: Helmet molding device
110: inner mold 120: outer mold
121: Support plate 123: Air exhaust fine holes
130: Pressure reducing portion 131:
133: chamber member 140: mold pressing part
141: pneumatic tube 141a: grommet part
143: Compressor 145: Pneumatic line
147: opening and closing valve

Claims

An inner mold formed of silicon having elasticity and heat resistance and having a helmet molding material adhered to an outer surface thereof; An outer mold disposed to be spaced apart from the inner mold so as to surround the molding material and having an air vent hole; A decompression unit that receives the outer mold, removes the air between the inner mold and the outer mold, and maintains the inner air pressure lower than atmospheric pressure; And a mold pressurizing unit for injecting compressed air into the inner mold to expand the inner mold,
The decompression unit includes a hollow space member in which the inner air is discharged to the outside when the outer mold is accommodated; And a chamber member for receiving the vacuum space member,
While the chamber member is depressurized to a vacuum state so as to completely remove the air layer between the inner mold and the outer mold, the vacuum space member is continuously depressurized by the vacuum pump,
Wherein the outer mold is formed with air discharge micropores such that air between the inner mold and the outer mold can be completely removed.

The method according to claim 1,
Wherein the pressure reducing portion is maintained at an internal temperature of 100 to 130 degrees when the mold pressurizing portion presses the inner mold.

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3. The apparatus according to claim 1 or 2, wherein the mold-
A pneumatic tube positioned inside the inner mold; A compressor for supplying compressed air to the pneumatic tube; A pneumatic line connecting the pneumatic tube and the compressor; And an on-off valve disposed on the pneumatic line,
And the compressed air is repeatedly applied to the pneumatic tube in a state where the pneumatic tube presses the inner mold, so that the inner mold is struck.