DE19832325A1 - Outer skin parts production for vehicles - Google Patents

Abstract

Outer skin parts for vehicles made of fiber-reinforced plastic comprises producing a resin/hardener mixture with a heated resin and then directly injecting into the molding chamber.

Description

The invention relates to a method in the preamble of the first Art.

In the production of small series or special series for outer skin parts of vehicles, especially motorcycles, it is known to be laminated Manufacture carbon fiber parts by hand in an open form. The stability of the outer skin part is after drying / curing of resin and Hardness reached.

The outer skin parts produced in this way have a high rigidity at low according to its own weight. The disadvantage here is that they are low Have toughness and therefore easily destroyed in an accident of the vehicle splinter, causing additional injuries to those involved in the accident can call. Another disadvantage is that due to the hand only a few components can be manufactured, which are also expensive.  

In addition, there is generally the injection process for the manufacture of construction parts known from fiber-reinforced plastics (e.g. plastics fe / Synthetiks, 1993, Issue 10, pages 40 to 45). With this procedure you can Body parts for vehicles are manufactured in small series, the price more valuable and of higher quality than those produced by hand Components are. The disadvantage here, however, is that they have a minimum wall thickness have ke of <3 mm.

The object of the present invention is to provide an injection method beat with the outer skin parts for vehicles made of fiber reinforced Small-scale production of plastics with a high surface quality can be, which also have a small wall thickness.

This object is achieved by the features of the first solved. By using a heated hardener, i.e. H. one Hardener, which heats up to above room temperature, for example about 40 ° the resin / hardener mixture becomes fluid enough to cover the component wall to achieve ken, which are clearly below the previous wall thicknesses for example in the range of 1 mm or less. It is essential to do this The resin flows through the mold cavity ascending from bottom to top to let.

Another advantage of the invention is that by the proportioning the resin and hardener parts before mixing none otherwise during injection necessary inlet route is required before each injection operation must be cleaned with a solvent. Thus Lö resources and working hours saved, which leads to a significant reduction in Manufacturing costs leads.  

The development according to claim 2 has the advantage that the outside of the Component manufactured according to the invention are not additionally painted got to. It already has final quality. Only a polishing process may be necessary downstream.

The further development according to claim 3 increases the rigidity of the component reached. Despite the use of two mats, namely the fa Server-reinforced plastic mat and a reinforcement mat, can be used with the method according to the invention component wall thicknesses in the range of 1 mm can be achieved. These components have high strength and high elasticity with high security against splinters. Experiments have shown that motorcycle fenders, produced by the method according to the invention, do not tend to shatter despite massive deformation.

The further development according to claim 4 will secure in a simple manner ensures that both mats pass through evenly from the resin / hardener mixture to be soaked. At the same time it ensures that a minimal Consumption of resin / hardener mixture is guaranteed. So at for example motorcycle fenders with the inventive method with only an overflow on the mold cavity. The so "lost" Resin / hardener mixture is therefore very low.

Claims 5 to 7 preferably describe materials for the fiber reinforced plastic mat and the reinforcement mat.

Through the development according to claim 6 with the invention processes are used to produce decorative, high-quality outer skin parts those due to the use of a clear surface paint in the Shape the structure of the carbon fiber reinforced plastic mat is visible. The The grain of the carbon fibers and the colored glass fiber threads  remains completely parallel with the inventive method, so that the components produced in this way have a high optical quality.

In the following the method according to the invention is based on the production of a motorcycle fender explained in more detail.

The mold used for this consists of two mold halves, the are designed according to the contour of the fender. First, the Surface paint on the mold half that bil the outside of the component det, sprayed. Since the molds are heated, it dries quickly and forms a slightly sticky surface.

Then the cut carbon fiber reinforced plastic mat with the colored fiber optic threads inserted. Because of the slightly sticky Paint surface, it sticks in the mold half without additional Tools.

Then the glass fiber reinforced plastic mat is placed on top and Attached with the help of adhesive strips. These adhesive strips are arranged in this way net that they form flow guide elements for the resin / hardener mixture, this ensures that both mats are completely covered with the resin / hardener mixture can be soaked.

After inserting and fixing the glass fiber reinforced plastic mat the form is closed.

Then the cartridge for the production of this fender is required amount of resin and hardener mixed, with the hardener on top is warmed to half the room temperature.  

After the resin and hardener have been mixed, the cartridge is turned on the inlet of the mold and the resin / hardener mixture injected into the mold at the lowest point.

Due to the injection of the resin / hardener mixture at the lowest point of the Mold tool, the flow guide existing in the mold mente and at the highest point of the form, diametrically the inlet ge opposite resin overflow becomes a complete in no time Impregnation of the two plastic mats achieved.

After the resin / hardener mixture has hardened, the molding tool can be used be opened and the component removed. Then it only has to still on its edges according to the contour of the later component be circumcised.

Claims (7)

1. A process for producing outer skin parts for vehicles from fiber-reinforced plastics, in which a fiber-reinforced plastic mat is placed in an open mold and, after the mold has been closed, soaked with a resin / hardener mixture and removed from the mold after curing. characterized in that the resin / hardener mixture required for the production of an outer skin part in each case is produced with a heated hardener and is then injected from the lowest point of the mold ascending into the mold cavity. 2. The method according to claim 1, characterized in that before inserting the fiber-reinforced art into the mold a surface varnish (gel coat) on which the Outside of the outer skin part forming mold half is applied.   3. The method according to claim 1 or 2, characterized in that on the inserted fiber-reinforced plastic a reinforcement mat is placed on the molding tool is increased. 4. The method according to claim 3, characterized in that the attachment for the reinforcing mat at the same time as a flow control element for the injected resin / hardener mixture serves. 5. The method according to any one of the preceding claims, characterized in that as a fiber reinforced plastic mat a koh fiber-reinforced plastic mat (CFRP) is used. 6. The method according to any one of the preceding claims, characterized in that the CFRP mat woven in, contrasting colors Has glass fiber threads. 7. The method according to any one of the preceding claims, characterized in that as a reinforcing mat a glasfaserver reinforced plastic mat is used.