(57) For the purpose of lubricating a cavity, particularly an annular cavity in a tool
for forging blanks produced by powder metallurgy, a lubricant spray is directed towards
a limited portion of the cavity surface and the nozzle is displaced such that impingement
area of the spray against the cavity sweeps over the entire surface of the cavity.
The impingement surface of the lubricant spray is adapted to cover the radial extension
of the annular cavity, the nozzle being displaced along the periphery of the cavity.
An apparatus for carrying out the method includes a carrier (10) with a mounting (11)
for a swinging arm (12) carrying a spray nozzle (14). The carrier (10) is adapted
for being positioned for mounting of the arm coaxial with the axis of the cavity,
the arm (12,13) being arranged for positioning the nozzle (14) over a peripheral portion
of the cavity. Means (31) are arranged for causing the nozzle (14) to circulate along
the periphery of the cavity.
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