Influence of the press ram motion on the joining characteristics during indentation plastic joining using a servo press

Abstract

A plastic joining method for fixing bars and hot plates, called "indentation plastic joining", was carried out using a servo press with press ram speed control. The influence of the press ram motion control on the indentation joining characteristics of an aluminum alloy bar and plate was examined. The accelerated ram motion was effective in reducing the bar indentation pressure by approximately 15% and the bonding strength of the indented barplate was improved by approximately 7%. The bonding mechanism underlying the indention joining method under press ram motion control is discussed in terms of the seizure of the plate and the mechanical clamping associated with the process. It is found that the accelerated ram motion produces heavier seizure at the indented bar-plate interface, whereas the decelerated ram motion reduces the degree of the seizure.

Indentation plastic joining of steel rod and polycarbonate plate

“…In indentation plastic joining of a cold metal rod and a cold resin plate, it is expected that the seizure between the rod and the plate hardly occurs. In our previous research works of indentation plastic joining of a cold metal rod and a hot metal plate (Matsumoto et al, 2008(Matsumoto et al, , 2014, the indented rod was fixed to the pierced plate by combination of thermal shrinkage and seizure of the plate. In this condition, joining strength was mainly due to the seizure.…”

“…Figure 2 shows the die arrangement used for indentation plastic joining of a rod with a plate. The dies used in our previous research works (Matsumoto et al, 2008(Matsumoto et al, , 2014 were used. The rod held by the rod holder was pushed into the plate without lubrication at room temperature.…”