A supplier of automotive components including engine mounts, Delphi's new process provides two key benefits: it improves the reliability of the bond and it employs waterborne adhesive technology, helping to preserve the environment. The rubber-to-metal adhesive is applied as a two-part system requiring a primer followed by a top coating. Both coatings must be applied and dried properly within a narrow process window.
After heating the parts to 160°F (71°C) in an electric convection oven, the parts are precisely sprayed at a highly automated spray station. Because only some surfaces of each mount are coated, Nutro selected an HVLP spray gun with a special rotating head. Nutro verifies the primer has been applied properly using its Spray-i system.
At a second spray station, the top-coat adhesive is applied to both inner halves of the part. Then, the part is automatically ejected onto a flat mesh belt that will take it through another electric convection oven. Once curing is complete, the part goes to the post-dry process.
With the new system, Delphi can track individual parts and create less inventory, allowing for better quality control. Better yet, consumers can look forward to vehicles with less vibration and noise.