Allmanna Svenska Elektriska Aktiebolaget

Asea

Erik Lundblad

Jan Nilsson

Hans Larker

Olle Lindstrom

Bertil Lundback

In the hydrostatic extrusion of tubes in a press which has a pressure chamber containing a high pressure cylinder, a pressure generating portion insertable into the cylinder, a die arranged in the cylinder and a mandrel axially fixed in relation to the die and composed of a carrier portion and a tip, and in which the tip forms with the opening in the die a gap in which a tubular billet is shaped into a tube by hydrostatic extrusion, in connection with the insertion of the tubular billet, a seal is produced initially between the mandrel and the hole in the billet at a point between the front part of the mandrel carrier and the hollow wall of the billet. This may be done by producing a constriction of the front end of the hole in the billet before the mandrel is inserted therein or by upsetting the billet against the die.

Method for hydrostatic extrusion of tubes

A grinding element having a grinding section comprising diamond particles individually embedded in a resin binding medium with improved performance characteristics is provided, along with a method of making same. The improved characteristics are obtained by utilizing a metal coating on the diamond particles in the grinding section, which metal coating has a thickness of between 0.5 and 25 microns, preferably 5 to 20 microns, to impart to the section superior grinding properties to those which can be obtained with a like section wherein the diamond particles are not so coated.

Growing community of inventors

Robertsfors, Sweden

Erik Lundblad