Abstract:
Tungsten carbule/cobalt ("WC/Co") is widely uscd for cutting tools, me!al-formmg
tools, mining tools, and wear resistance surfaces for various 3pplieations. For these
application; (he Important mechanical properties arc hardncss, toughness, compressive
strength, transverse rupture strength, and wcar resistance.
The properlie~ of tungsten carbide/cobalt (WC/Co) are controlled by composition
and microstructure. The hardness increases wilh decreasing Co (Cobalt) content and
smaller paltiele size of WC. Again addition of titanium carbide and tantalum carbide with
WC/Co improve significantly hot hardness; reduce' transverse IUpture strcngth and the
tcndency of chips to weld of the cutting tool edge.
In this, project worl(, carbide insert was fabricated by varying composition and
reducing the grain size of tungsten carbide (WC) in BOr (Bangladesh Ordnancc
Factories). Here this insert is tenned JS the 'New lnsert' and the standard/traditional insert
ol'BOF is termed as 'Existing lnscrt'. Thc composition offabrieatcd carbide was selected
by reviewing several papers atld handbooks, The grain size of we is measured by using
the sieve. Other paramcters of prescnt we fabrication process rcmain unchanged.
To compare the perfonmmce, brazed insert tuming tool was manufactured by the
newly fabricated insert and maehimng on steel was pcrfomled. Proces~ parameters such
as tool wear, surface finish and temperature was recorded for both (he newly fabncated
insert and existing insert with samc cutting condition. 1l is found that surface finish
improvcd whercas tool wcar and tcmperature gencration rcduees for the ucwly fabricated
inscrt tool.
