Reinforced structural body
The present invention describes a hollow structural body such as an automotive unibody or frame rail that is reinforced with a reinforcing material such as a polyurethane foam by inserting into a portion of the structural body a bulkhead-containing insert, which, in combination with the structural body at the place of insertion, creates a containment region for the reinforcing material. Uncured reinforcing material can then be added to the containment region and cured. The present invention solves a problem in the art by providing structural reinforcement to be easily and precisely placed within the structural body to provide, for example, enhanced crash resistance or improvements in acoustical properties.
1. A method for reinforcing a structural body having a cavity comprising the steps of a) inserting into a portion of the cavity of the structural body a bulkhead-containing insert which, in combination with the structural body at the place of insertion, forms a containment region for a reinforcing material, which containment region has an inlet; b) sealing the insert to the structural body; c) adding through the inlet of the reinforcing region a sufficient quantity of an uncured reinforcing material to at least partially fill the containment region; and d) curing the reinforcing material wherein the bulkhead containing insert contains one or more protuberances which extend in the direction of the reinforcing material wherein one or more of the protuberances protects an opening in the structural body from becoming clogged with reinforcing material.
2. The method of claim 1 wherein the structural body is an automotive frame rail or unibody.
3. The method of claim 2 wherein the uncured reinforcing material is an expandable 2-part polyurethane resin or an expandable 2-part epoxy resin.
4. The method of claim 3 wherein the uncured reinforcing material is an expandable 2-part polyurethane resin.
5. The method of claim 1 wherein the insert is heat sealed to the structural body by way of a heat activated expandable epoxy adhesive or a heat activated non-expandable silicone or acrylic adhesive or by mechanical means.
6. The method of claim 1 wherein the insert is heat sealed to the structural body by way of a heat activated expandable epoxy adhesive.
7. The method of claim 4 wherein the reinforcing material substantially fills the containment region.
8. A method according to claim 1 wherein one or more of the protuberances are sealed to the structural body.