Asea Aktiebolag

Marja Widell

Anders Persson

Otto VonKrusenstierna

Kai Nilsson

Tom Johannisson

Rolf Sjoblom

The pressure medium used in the pressure chamber of a hydrostatic press is degassified in a degassing tank prior to delivery to the pressure chamber so as to improve the resistance of the pressure cylinder, or the liner inside of the pressure cylinder, to fatigue. The degassified pressure medium can be a mixture of recirculated pressure medium recovered after passage through the die extrusion hole and new pressure medium, such as castor oil.

Press for hydrostatic extrusion of tubes and profiles

A system for determining the oxygen activity in molten metals includes a measuring probe insertable in the melt and provided with an electrochemical cell, a thermoelement, and three contact devices. The probe is mounted at the end of a measuring lance. A preamplifier mounted on the lance is connected to the contact devices and furnishes the signals received to a preamplifier which supplies signals to a calculating unit which converts the EMF of the electrochemical cell and the EMF of the thermoelement to magnitudes representing the oxygen acitivity and the temperature, which are either recorded or observed on indicators. The measuring probe is mounted in a paper sleeve which is removable attached to the end of the lance. The electrochemical cell includes a body of solid electrolyte passing through the outer end wall of the cell and connected to one of the contact devices.

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Vasteras, Sweden

Marja Widell