According to foreign media reports, structural adhesives are becoming more and more widely used today. Engineers use adhesives to connect new materials because their adhesion lasts longer. Longer, which helps improve vehicle rigidity and provides other conveniences.
Often, structural adhesives are used in conjunction with traditional joining techniques. The steel materials selected by car companies for the body are getting thinner and thinner, so only using spot welding technology is not the best solution for car companies. To this end, the application of weld bonding technology was born, that is, a combination of spot welding and adhesives. This technology was applied to the body-in-white of the 2018 Honda Odyssey. The body is composed of the following materials: low-strength steel (41%), press hardened steels (7%), high-strength steel (6%), advanced high-strength steel (37%), ultra-high-strength steel ( 8%) and aluminum (1%).
According to Nicholas Goldsberry, head of body research and development for the 2018 Odyssey at Honda’s R&D department, the amount of structural adhesive used in the fifth-generation Honda Odyssey has doubled compared to the previous model. twice as much. The length of the bonded material is 44 meters (144 feet), which saves engineers the need for additional stampings and reinforcements weighing 5 kilograms (11 pounds) and improves the vehicle’s torsional rigidity by 10 percent.
According to Dr. Tyler Auvil, senior chemist at Dow Chemical’s Structural Adhesives R&D Department, after the body and closure panels arrive for assembly, Behind the scenes, workers use a spray treatment system to clean metal parts and remove cutting oil and other debris. However, there are certain hidden dangers in this cleaning process, which may result in the adhesive of such structural parts not curing.
If the adhesive on the adhesive layer is washed away during the cleaning process, the bonding strength at that location will be weakened. The cleaning process may also allow uncured adhesive to re-accumulate to the body surface, and the body panels are then sent into the oven with the adhesive. In this case, workers also need to sand away the cured adhesive and repair damaged paint.
Dow Chemical has launched a new generation of structural adhesives called Toughened Betamate, which may be used in vehicle assembly for the first time in early 2018. In tests, the epoxy-based structural adhesive demonstrated greater washout resistance. The factory will use a robotic applicator to ensure high-quality adhesion of the product.
This adhesive can be cured at low temperatures, with a wide curing temperature range and consistent shear strength. The tensile modulus of this adhesive has also been improved, making it very suitable for advanced high-strength and ultra-high-strength alloy steel materials.
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