The result of an indirect machining force measurement in ultrasonic machining is described. The mean machining force
Fo is able to be determined from the contact duration τ of tool with a test piece and the static feeding force
P, namely by the momentum theory
τ
Fo=
P.
T so,
Fo=
P·
T τ,
where
T =ultrasonic oscillation period.
The duration of contact which is transformed to the electrical contact duration of tool with a test piece is measured by the cathoderay oscilloscope.
The results obtained are as follows ;
1) when machining rate is max., the machining force is max.,
2) wearing rate of tool is approximately proportional to machining force,
3) larger feeding force will be better for tougher test pieces,
4) with britller test pieces the ratio of machining rate to machining force is larger.
抄録全体を表示