Abstract
In this paper, we propose a shock reduction mechanism for a force control system such as a die cushion. An impact arises between an upper die and a blank holder, on the die cushion used for draw forming. A shock at the time of an impact is reduced by using soft springs by short stroke. Two impacts occur on the die cushion by choosing a suitable spring constant. And a optimal value exists in the spring constant. The proposed method is applied to a prototype of novel AC servo die cushion developed for the first in the world.
