Abstract: A method and an apparatus for axially shaping a tube use a mandrel guided in the tube and an annular die guided on the outside of the tube. The tube is clamped in a clamping device. The outer diameter of the tube is reduced by moving the annular die in a pushing direction. In order to form undercuts on the outside and inside of the tube the method uses the following steps: Reversing the direction of movement of the die and the mandrel upon reaching an end position from the pushing direction to an opposite pulling direction. In a first setting step, the die and the mandrel are then moved in relation to one another to a first preset annular-gap setting, and in a subsequent first shaping step, the die and the mandrel are moved in the pulling direction, while maintaining the preset annular gap.

Abstract: A cooling unit for cooling the air admitted to the interior of a switchgear cabinet (100), which cooling unit has an inner circuit, through which the air to be cooled is routed from a switchgear cabinet interior, and an outer circuit (3) which is fluidically partitioned from the inner circuit and through which the surrounding air is routed, wherein the inner circuit contains a first heat exchanger and the outer circuit contains a second heat exchanger, between which a coolant is circulating, wherein the heat exchangers have an air flow direction along which the heat exchangers allow air to pass between an air inlet side and an air outlet side, characterized in that at least one of the heat exchangers has a first air guide upstream on the air inlet side, which extends at an angle with 5<?<45° relative to the air inlet side and forms an air duct between itself and the air inlet side, which tapers along a dimension of the air inlet side.

Abstract: A cooling unit for cooling the air admitted to the interior of a switchgear cabinet (100), which cooling unit has an inner circuit, through which the air to be cooled is routed from a switchgear cabinet interior, and an outer circuit (3) which is fluidically partitioned from the inner circuit and through which the surrounding airis routed, wherein the inner circuit contains a first heat exchanger and the outer circuit contains a second heat exchanger, between which a coolant is circulating, wherein the heat exchangers have an air flow direction along which the heat exchangers allow air to pass between an air inlet side and an air outlet side, characterized in that at least one of the heat exchangers has a first air guide upstream on the air inlet side, which extends at an angle with 5<?<45° relative to the air inlet side and forms an air duct between itself and the air inlet side, which tapers along a dimension of the air inlet side.

Abstract: Balls changing volume when activated efficiently filing a gap providing acoustic and thermal insulation. A method of manufacturing of means for acoustic and thermal insulation, particularly at high temperatures, comprising providing an insulating and damping material; shaping of the insulating and damping material having geometric shapes, such as spherical or elliptical shapes, by a shaping processes, such as forming into a ball and/or foaming up.

Abstract: A reciprocating grate cooler has a plurality of grate plates mounted on a reciprocable support structure for conveying hot material longitudinally across a grate surface formed by the grate plates. The support structure has passages therein and an inlet for admitting cooling gases into the passages for delivery to the hot material. A stationary cooling gas delivery duct has an outlet adjacent the inlet of the support structure and both are provided with sealing frame plates mounted on the support structure and delivery duct, respectively, in generally parallel, closely spaced relation to one another to provide a wear-free dynamic air seal between the delivery duct and the support structure.