Research on hot-melt self-tapping technology and performance of aluminum alloy
In the modern automobile industry, reducing body mass to reduce fuel consumption is an important development direction at present. At the same time, vehicle collisions have gradually become the core issue of concern. Therefore, the reasonable selection of metal materials to manufacture the body structure is an important solution for the requirements of both the economical use of the vehicle and the vehicle crash performance. Aluminum alloy has become an important structural material for modern body-in-white due to its excellent mechanical properties, low density, and easy recycling.
Since the main properties of the FDS joints expected to be obtained are good shear load, peel load and tensile load, but considering that the shear action of the joint during the vehicle crash is the main mode of action, the shear performance is given priority during process optimization. At the same time, considering the peeling and tensile properties of the joint, the optimization level of the three factors is A1B3C3, that is, in the drilling stage, the rotational speed is 5 000 r/min, the axial downward pressure is 1.5 kN, and the tightening torque is 11 N∙ ;m, FDS joints with good comprehensive performance can be obtained.