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INTRODUCTION

CARBIDE – PRODUCTION

Metal forming – pressing – machining

Metal forming

The objective of the forming process is to obtain a near net

shape sample. Pressing is normally carried out at room tem-

perature with pressures reaching up to several tons per square

centimetre.

There are several ways of pressing blanks:

During isostatic cold pressing the powder is filled into an elas-

tic flexible hose and pressed into a compacted form through

high liquid pressure. The powder blocks which are produced

in this way can then be processed mechanically. All common

machining methods like milling, cutting, drilling or turning may

be applied.

In uniaxial pressing the pressing tool consists of a die and an

upper and a lower punch. The carbide powder is filled into the

die and then compacted to create the so called green carbide,

which is ejected from the pressing die.

Extrusion pressing is mainly used to produce rectangular bar

or cylindrical rod, with or without axial hole(s). A plasticiser is

added to the powder. The resulting paste is pressed through

an extrusion nozzle. Before sintering, the plasticiser must be

evaporated in special drying furnaces.

Metal Injection Moulding (MIM) is a process used to produce

more complex forms which cannot be produced by direct pres-

sing. The paste preparation is similar to the extrusion process.

Pressing

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