KR20020020071A - Method and apparatus for helmet shell - Google Patents

Abstract

PURPOSE: A helmet main body manufacturing device and a method thereof are provided to continuously mold helmet main bodies without any curing time delay and densify the structure with uniform thickness and high strength by filling liquid state resin into micro holes of a stacking element. CONSTITUTION: A helmet main body manufacturing method includes the steps of forming stacking elements(100) in molds(2) in the shape of helmet main body separatively, injecting a liquid state thermoplastic resin(200) diluted with a curing agent into the molds and assembling a cover(6) mounted with an air bag(8) and a valve(32) for opening or closing the air bag for the injection of compression air, adhering the resin with the stacking element by pressing the liquid state resin by expanding the air bag by injecting the compressing air after connecting the valve with an air hose connecting element(34) connected to a compressor(12), and curing the resin in a curing room after closing the valve and separating the compressor from the molds.

Description

Method and apparatus for manufacturing helmet body {METHOD AND APPARATUS FOR HELMET SHELL}

The present invention relates to a method and apparatus for manufacturing a helmet main body, and more particularly, a method and apparatus for manufacturing a helmet main body configured to shorten the production time while keeping the structure of the helmet main body with dense, uniform thickness and high strength. It is about.

In general, the helmet is provided to protect the occupant's head when riding a motorcycle, etc., and is regulated by law to always wear a helmet when driving on a road.

A helmet that is commonly used is composed of a helmet body having an inner space and forming an outer appearance of the helmet, and a liner having a predetermined contracting force and restoring force to be fixed to the inner surface of the helmet body and to be in close contact with the head of the helmet wearer.

The helmet body protects the head of the helmet wearer by having a strength that can be sufficiently endured without being damaged even when the impact is applied from the outside, and the liner absorbs the impact that the impact has been applied to the helmet body to protect the safety of the helmet wearer. To play a role.

The helmet body is made of synthetic resin such as polycarbonate or the like, and the liner is made of a material that can absorb shock, such as expanded polystyrene.

The manufacturing method of the helmet body constituting such a helmet is a hand lay-up (manual lay-up) method of manufacturing by manually stacking a material of a certain thickness, pressure molding method using an air bag and injection molding method commonly used It is largely divided.

In the hand layup method, a laminate made of glass fiber or the like is laminated one by one using a resin such as glass fiber or the like in a mold made of a helmet body-shaped FRP or an aluminum alloy, and then moved to a curing chamber. By hardening for a certain time to produce a helmet body.

In the pressure molding method using the air bag, a suitable amount of a laminated material such as glass fiber is piled up inside a metal mold equipped with a heater therein, and then a thermosetting resin such as a polyester or vinyl ester in a liquid state is put therein. Is placed inside the mold and then inflated by injecting air into the airbag so that the resin adheres to a certain thickness on the surface of the laminate, and the heater mounted on the mold is heated and cured for a predetermined time to manufacture a helmet body.

In the injection molding method, a liquid thermoplastic resin is introduced into an injection mold, and a predetermined pressure is applied thereto to produce a helmet body.

However, in the conventional manufacturing method of the helmet body, the hand lay-up method is made by manual work using a brush or roller when laminating a laminate such as glass fiber using a resin such as polyester in a mold. As a result, not only the manufacturing time of the helmet body is long, but also the content of the resin is greater than that of the laminated material such as glass fiber, which is relatively heavy.

In addition, by curing the main body of the helmet at atmospheric pressure, the shrinkage generated at the time of curing is different according to the ambient temperature. Accordingly, the dimension of the main body of the helmet is not constant. There is a problem that the defective rate of the helmet is increased.

The press molding method using an air bag is not only difficult to handle due to the heavy weight of the mold because the heater is mounted inside the mold, but also requires a lot of manufacturing cost, and when the operator hardens when injecting air into the air bag to pressurize and operate the heater to cure Because you have to wait until the productivity is reduced.

In addition, the injection molding method requires a lot of mold manufacturing cost compared to other manufacturing methods, resulting in high production costs, and in order to maintain the same strength as that of the helmet body manufactured by other methods, the thickness must be thickened, resulting in heavy weight. .

The present invention has been made in order to solve the conventional problems as described above, the object of the present invention can reduce the mold manufacturing cost for manufacturing the helmet body, while maintaining the dimensions accurately while reducing the thickness of the helmet to the next process It is to provide a method and apparatus for manufacturing a helmet main body that can prevent the assembly of phosphorus.

Still another object of the present invention is to provide a method and apparatus for manufacturing a helmet main body which can increase productivity by shortening a manufacturing time of a helmet main body.

In order to realize the object of the present invention as described above, the step of adding a laminate to the inside of the mold of the helmet body shape detachably coupled to each other; Injecting a thermosetting resin in a liquid state in which the curing agent is diluted, and assembling a lid having an air bag and a valve for opening and closing the air introduced into the air bag into a mold; Connecting an air hose connector connected to a compressor to the valve, and injecting compressed air into the air bag to pressurize the resin in a liquid state while the air bag is inflated so that the resin adheres to the laminate; After closing the valve and separating the mold and the compressor connected through the air hose connector, and provides a method and apparatus for manufacturing a helmet body comprising a curing process for curing the resin inside the mold by moving the separated mold to the curing chamber.

1 is a front view of a state in which one mold of the manufacturing apparatus is removed to manufacture a helmet main body according to the present invention.

2 is a cross-sectional view showing a state in which packing is installed in a mold.

Figure 3 is a sectional view showing that the helmet is manufactured using the helmet body manufacturing apparatus according to the present invention.

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

1 is a front view of an apparatus for manufacturing a helmet body according to the present invention, Figure 2 is a side view of the mold of Figure 1 viewed from another direction, the apparatus for manufacturing a helmet body according to an embodiment of the present invention, A pair of molds 2 having an inner side shape of a helmet body and detachably coupled to each other, and a lid detachably coupled to a fixing member 4 such as a bolt and a nut on an upper portion of the mold 2 ( 6), an air bag 8 installed into the mold 2 through the central portion of the lid 6, a nozzle connected to the air bag 8 while being hermetically and extending out of the lid 6; 10) and a compressor (12) connected to the nozzle (10) to supply compressed air to the airbag (8).

The mold 2 is made of aluminum alloy having good thermal conductivity, and its thickness is about 3-20 mm.

When the thickness of the mold 2 is about 3-20 mm, the mold can be manufactured relatively lightly and the mold manufacturing cost is inexpensively low. In addition, after the resin is added to the mold to form the shape of the helmet body, When transferred to a curing chamber having a temperature and cured, the mold 2 is formed to a relatively thin thickness, so that heat transfer is rapidly performed, thereby shortening the curing time.

In addition, a Teflon coating layer 13 is formed on the inner wall of the mold 2 to prevent the resin from adhering when the helmet body is molded.

One side of the mold 2 is formed of a flange portion 14, a plurality of holes 16 are drilled in the flange portion 14 to the other mold having a structure corresponding thereto by using bolts and nuts, etc. It can be detachably combined.

In addition, as shown in FIG. 2, the packing 18 is interposed between the molds 2 to maintain the airtightness between the molds 2 when the molds 2 are coupled to each other.

In addition, a trap 20 is formed on the upper inner surface of the mold 2 to collect raw materials and air of the remaining amount introduced into the mold 2 when the helmet body is manufactured, and the mold 20 is formed in the trap 20. A discharge pipe 22 penetrated to the outside of the trap 20 is provided so that the remaining resin is discharged to the outside of the mold (2).

The discharge pipe 22 is connected to the hose 23, the end of the hose 23 is provided with a tank 24 containing the remaining raw material discharged.

Although two traps 20 are shown in the present embodiment, one or three or more traps may be formed as necessary, and a plurality of discharge pipes 22 connected to the traps 20 may also be formed.

The nozzle 10 has a threaded portion formed on an outer circumferential surface of the lower end, and the threaded portion is provided with a nut 26 which is movably coupled along the threaded portion, and one end of the nozzle 10 is orthogonal in this nozzle 10. The support 28 is formed to extend, the pressure gauge 30 is installed on the opposite side to check the air pressure of the air bag (8).

The combination of the nozzle 10 and the air bag 8 is screwed so as to be movable to the nozzle 10 in a state in which the nozzle 10 is inserted into the inlet portion of the air bag 8 located inside the mold 2. When the nut 26 located on the outside of the lid 6 is tightened, the support 28 of the nozzle 10 comes into close contact with the bottom of the lid 6 and presses the inlet of the airbag 8 to the nozzle 10. And the airbag 8 are kept confidential.

Thus, the nozzle 10 and the airbag 8 are integrally coupled to the lid 6 while maintaining their airtightness.

The upper part of the nozzle 10 is provided with a valve 32 for opening and closing the air introduced into the air bag 8, the valve 32 is connected to the air hose connector 34 connected to the compressor 12.

In order to manufacture the helmet main body using the apparatus for manufacturing a helmet main body, the mold 2 is first assembled and the laminated material 100 such as glass fiber, kevlar fiber, polyethylene fiber or the like is coated on the inner wall thereof, and then In the state of about 300-500g of a thermosetting resin 200, such as a polyester resin, a vinyl ester resin, an epoxy resin, and the like, in which the curing agent is diluted, is added, and then the lid 6 on which the air bag 8 is mounted is fixed to the fixing member ( 4) is assembled to the mold (2).

Then, when the valve 32 is opened and the compressor 12 is operated to inject air into the air bag 8, as shown in FIG. 3, the air bag 8 is inflated to pressurize the resin 200 in the liquid state. As the pressurized resin 200 is evenly spread on the laminate 100, the resin 200 is adhered to the laminate 100 by the adhesiveness of the resin 200, and is press-molded into a helmet body shape.

At this time, the air in the mold 2 and the residual resin 200 are collected in the trap 20. When the residual resin cannot be collected in the trap 20, the remaining resin of the trap 20 is discharged to the discharge pipe 22. Is discharged to the tank 24 through the hose (23) through.

In this molding, the air pressure of the airbag 8 is preferably maintained to be 3-7 kgf / cm 2, and during the molding, the airbag 8 expands the fine pores of the laminate 200 in the liquid state. 100) is filled to make the tissue compact and at the same time have a uniform thickness and high strength.

As such, when the appropriate amount of air is introduced into the airbag 8, the valve 32 is closed, and the air hose connector 34 detachably connected to the valve 32 and the compressor 12 is removed to separate the mold 2 and the mold. After the compressor 12 is separated, the separated mold 2 is moved to a curing chamber using a conveying means such as a conveyor, and then cured for about 10-30 minutes at a temperature of 80 ° C-150 ° C, and then the valve 32 is Opening the air bag (8) to remove the air and remove the mold (2) to complete the helmet body in a state where the laminate 100 and the resin 200 is firmly bonded.

Although the preferred embodiments of the present invention have been described for purposes of illustration, the present invention is not limited thereto, and various modifications can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings.

As described above, the method and apparatus for manufacturing a helmet main body according to the present invention, after pressing the helmet main body using an air bag, rapidly maintains the air pressure of the air bag as it is, using a conveying means such as a conveyor, to a curing chamber. After the movement, since the helmet body can be continuously molded in the same manner as described above using another mold, productivity can be improved since continuous operation is possible without waiting for a hardening time as in the conventional press molding method.

In addition, when the airbag is inflated, the resin is filled with a fine hole in the laminate, so that the structure of the helmet body becomes dense and uniform thickness and high strength ensure safety of the helmet wearer.

Claims (7)

Padding the laminated material inside the mold of the helmet body shape which are detachably coupled to each other; Injecting a thermosetting resin in a liquid state in which the curing agent is diluted, and assembling a lid having an air bag and a valve for opening and closing the air introduced into the air bag into a mold; Connecting an air hose connector connected to a compressor to the valve, and injecting compressed air into the air bag to pressurize the resin in a liquid state while the air bag is inflated so that the resin adheres to the laminate; And a hardening process of locking the valve to separate a mold and a compressor connected through an air hose connector, and then moving the separated mold to a curing chamber to cure the resin inside the mold. A pair of molds having an inner surface in a shape of a helmet body and detachably coupled to each other, a lid detachably coupled to a fixing member such as a bolt and a nut on an upper portion of the mold, and the mold through a central portion of the lid An air bag installed therein, a nozzle connected to the air bag while maintaining airtightness and extending out of the lid, a valve connected to the nozzle to open and close the air introduced into the air bag, and connected to the valve and compressed air to the air bag. Apparatus for manufacturing a helmet main body including an air hose connector that is detachably coupled to the compressor made to supply. The apparatus of claim 2, wherein the mold is made of an aluminum alloy and has a thickness of 3-20 mm. The apparatus according to claim 2, wherein a trap is formed on the upper inner surface of the mold to collect the remaining support charges charged into the mold when the helmet body is manufactured. The apparatus of claim 4, wherein the trap is provided with a discharge port through which the resin can be discharged to the outside of the mold when the remaining resin can no longer be collected. The apparatus of claim 2, wherein a packing is provided at the coupling portion of the mold to prevent the resin for manufacturing the helmet body from flowing out of the mold. The apparatus of claim 2, wherein a teflon coating layer is formed on an inner wall of the mold to prevent the resin from adhering to the mold.