Sandvik Ab

Alf Andersson

Bo Nelander

Ulf Jutterström

Ulf Jutterstr&ouml;m

A new method and apparatus for manufacturing powders of cemented carbide, cermets, ceramics and similar materials with good abrasive wear resistance starting from a slurry, wherein the slurry is introduced into a drop forming device including at least one essentially horizontal oriented rotating drop forming disk (), from which the drops are slung out to solidify by centrifugal force. According to the invention the slurry is ejected from a discharge opening () on the drop former in the form of a jet such that it hits a first obliquely downward and inwardly directed surface () whereby the speed of rotation of the disk is chosen such that the jet of liquid is forced upwards over the first surface as well as over to another connected horizontal surface () and thereafter is ejected as a split jet against a second obliquely downwards-outwards directed surface () such that the slurry is accelerated to the speed of the drop forming disk () and then is led over a third surface () obliquely directed outwards, from where the drops are then caused to detach themselves and fall down, thus forming a powder.

Method and apparatus for the drying of cemented carbide powder and the like

Solid particles are formed from a liquid by rotating a slinger about a vertical axis within a chamber to sling liquid droplets from vertically spaced annular rows of cusps disposed on an outer periphery of the slinger. An air flow is established within the chamber, the air flow rotating in a direction opposite the direction of rotation of the slinger. The air flow opposes travel of threads formed between successively slung droplets to cause the threads to separate from the droplets and turn into dust particles which become entrained in the air flow. The dust particles can thus be collected separately from particles formed by the droplets.

Method for the formation of solid particles from a liquid

A new method and apparatus for manufacturing powders of cemented carbide, cermets, ceramics and similar materials with good abrasive wear resistance starting from a slurry, wherein the slurry is introduced into a drop forming device including at least one essentially horizontal oriented rotating drop forming disk ( ), from which the drops are slung out to solidify by centrifugal force. According to the invention the slurry is ejected from a discharge opening ( ) on the drop former in the form of a jet such that it hits a first obliquely downward and inwardly directed surface ( ) whereby the speed of rotation of the disk is chosen such that the jet of liquid is forced upwards over the first surface as well as over to another connected horizontal surface ( ) and thereafter is ejected as a split jet against a second obliquely downwards-outwards directed surface ( ) such that the slurry is accelerated to the speed of the drop forming disk ( ) and then is led over a third surface ( ) obliquely directed outwards, from where the drops are then caused to detach themselves and fall down, thus forming a powder.

Method and means for drying cemented carbide and similar

Droplets are formed from a liquid by supplying liquid to a feeding rotor and rotating the feeding rotor about an axis to discharge the liquid generally radially outwardly by centrifugal force. A distributor disposed radially outside of the feeding rotor is rotated relative to the feeding rotor about the axis to receive liquid discharged from the feeding rotor. A slinger disposed radially outside of the distributor is rotated relative to the distributor about the axis to receive liquid discharged from the distributor by centrifugal force. The slinger slings that received liquid is slung outwardly in the form of droplets from cusps distributed circumferentially around an outer periphery of the slinger.

Growing community of inventors

Ödåkra, Sweden

Alf Andersson