DE4229058C2 - Process for the production of wheel axle links from glass fiber reinforced unsaturated polyester resins - Google Patents

Description

The invention relates to a method for producing high-strength wheel axle links glass fiber reinforced unsaturated polyester resins, in particular for rail vehicles.

The production of composite components using the monoforming process using resin Injection is known up to a maximum of 50% reinforcement material. According to patent DD 2 54 355 after inserting the reinforcing material small portions of the total amount of resin under pressure in the closed mold introduced, with each pressure surge followed by a relaxation phase and that Resin through appropriate facilities, e.g. B. hollow needles that in the Insert reinforcing material, is injected.

With more than 50% reinforcing material, however, this will known methods achieved no reproducible results.

The invention is based, higher task Proportions of reinforcement materials in the order of magnitude <50% reproducible series results due to improved wetting of the glass fibers to reach.

This is achieved by the measures of the claim.

The advantages that can be achieved with the invention not only allow greater advantages Glass reinforcement in the material composite, but reduce the exclusive injection alternating with resin and Relaxation phases required excess resin, which is necessary for the injection process can no longer be used and thus becomes a by-product.

The invention is explained in more detail using an exemplary embodiment.

The reinforcing material is placed in a geometrically defined mold blanks inserted dry in a defined sequence. After that, the shape closed and the activated resin batch pulsates over from a pressure pot flexible hose lines and a sprue unit with injection needles in the Reinforcement material introduced. Because the degree of wetting of the glass fibers  is directly proportional to the flow and flex energy of the injected resin, this is additionally achieved by pushing the mold in a vertical direction Direction, for example by lifting and falling freely onto a fixed one Platen increased. The compressing and deaerating effect is only then effective if the reinforcing material is replaced by an appropriate amount of resin, approx. 80% of the final filling in a homogeneous, plastic-like dough condition is offset.

The resin pressure pot to be used preferably for the process is with a interchangeable PE insert equipped for subsequent cleaning processes to minimize.

The control of the pulsating resin input can with the shock process in Change can be combined. As a pushing device, a commercially available Shock table with a frequency of 0.5 to 1.5, preferably 1.0 Hertz be set.

Excess activated resin mixture can in the relaxation phases Pressure pot are fed again, which causes the procedural Waste products are largely minimized.

Claims (1)

Process for the production of high-strength wheel axle links glass fiber reinforced unsaturated polyester resins Impregnation of the inserted reinforcement material by means of Resin injections under pressure and afterwards Relaxation phases, with the reinforcement material blanks dry in a fixed order in a geometrically defined Mold are inserted, then the mold is closed and the activated resin batch pulsating from a pressure pot with appropriate dosing control using compressed air Pipelines and a sprue unit with injection needles in the reinforcing material is introduced, thereby characterized in that after reaching a mold filling level of approx. 80% the ventilation and thus the wetting of the glass fibers via shock energy supply while injecting the Residual resin quantity takes place, the excess activated Resin mixture in the relaxation phases the pressure pot again is fed.