Patent ID: 7530247
Filing Date: 2009-05-12
Classification: B21D

Abstract:
1. A device for hydroforming metal elements, comprising: a hydroforming cell having a fixed rigid structure including: said hydroforming module comprising: a top die and a bottom die, which can be displaced vertically with respect to one another between an open condition and a closed condition in which they define between them a forming cavity for a metal element, set between them; means for supplying a liquid under pressure within said forming cavity; and means for controlling a relative vertical movement of the two dies, said means comprising: said vertically mobile member controlled by said wedge-shaped members which are horizontally mobile said at least one hydraulic cylinder and said vertically mobile member located between one die of said two dies of the hydroforming module and the fixed structure of said hydroforming cell, and control means prearranged so that said at least one hydraulic cylinder is activated only for controlling a movement of the two dies between the open condition and the closed condition, and said at least one hydraulic cylinder isolated with respect to a supply of hydraulic fluid so as to remain fixed at a desired size during the hydroforming process, said means for actuating the wedge-shaped members activated during the hydroforming process for applying to the two dies a force sufficient for preventing opening of said two dies during the hydroforming process, said at least one hydraulic cylinder functioning as a rigid transmission member for application of said force from the wedge-shaped members to the dies during the hydroforming process.