Abstract: The invention relates to a method for hot forming a blank consisting of an aluminium or steel alloy, in which the blank is heated before forming and subsequently formed in a forming tool at a temperature of at least 150° C., and to a device for carrying out the hot forming, having a forming tool which has a punch and a die. The object of proposing an economic method for hot forming is achieved for hot forming an aluminium or steel blank by placing an insulating material onto at least one surface of the blank before forming, wherein the insulating material has a lower thermal conductivity than the blank and the forming takes place with the applied insulating material.

Abstract: The invention relates to a device for pressure blasting by means of a mixed jet made of particles of a frozen gas and a carrier gas, comprising a nozzle housing, which encloses an outer cavity and an inner cavity, wherein the inner cavity forms an expansion space, which comprises an inlet at its upstream longitudinal end for inducting a liquefied gas into the expansion space, and comprises an outlet opening at its downstream longitudinal end, wherein the outlet opening comprises a much larger cross section than the inlet, and wherein the outer cavity envelops the inner cavity at least partially in the portion of the outlet opening, at least one liquid gas supply, which is connected to the inlet of the expansion space, a support gas supply, which is connected with the outer cavity, and an acceleration nozzle having a nozzle outlet downstream of the outlet opening of the expansion space, the acceleration nozzle initially contracts in flow direction, wherein a carrier gas defined laterally from the outlet openin