The bottom pressure distribution of the pressed powder bed was determined using commercial pressure detecting sheet. As a model powder, glass beads (0.105mm-0.088mm) was charged into stainless steel cylinder of 44.0mm, 29.6mm and 18.2mm diameter respectively, From photo-densitometry of the colored sheets, the local pressure was determined within the relative error of ±10%.
From the results of varying applied pressures (0.291kg/mm
2-0.584kg/mm
2) and thicknesses of the bed (9.2mm-48.6mm), a simple empirical equation
σ
z/
Po=
a(γ/
R)
2+
bwhere σ
z is the bottom pressure,
Po is the applied pressure, γ is the distance from center,
R is the inner radius of the cylinder and
a and
b are constants, was obtained.
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