科研之友
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摘要
Adhesively bonded blanks are manufactured using a method for combined forming and bonding of locally reinforced parts for body-in- white in the automotive and truck industry. The method allows lightweight constructions with steel sheets by generally reducing the thickness of body parts and compensates stiffness as well as strength by steel grades of higher yield points and locally applied reinforcement sheets where necessary. Applying adhesive bonding in the body-in-white shops implies certain boundary conditions, such as bonding on oiled surfaces and curing at cataphoretic burn-in after coating. Adhesive bonding, with the forming process being employed between, was successfully applied with film adhesives based on different polymer families and works the best in two steps, as the formation of already bonded and cured parts causes much damage to the bond lines. Due to the early softening stage in the electro coat (EC) burn-in oven, the adhesive in most cases needs the assistance of an additional fixation technique to avoid negative results of unwanted spring-back behaviour (especially with reinforcement sheets with higher yield points). Efficient auxiliary techniques for fixation are usually not based on adhesive technology because of a process-related short time frame. Three different fixation techniques additionally to the adhesive bonding of the reinforcement sheets were investigated in a research project. This paper discusses options and results on the complex interaction between forming and adhesive bonding.
- 出版日期2016
