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In order to meet increasing demand for
higher productivity and flexibility, recently many kinds of multi-functional machine
tools, which are capable of multiple machining functions or different kinds of
machining processes on one machine, have been developed and widely used in
manufacturing industries. In this study, a multi-functional turning lathe,
which has two spindles and two turrets so that multiple turning operations and
various machining processes could be performed simultaneously, has been
developed. Furthermore, the equations of correlation between whole responses
and cross responses of the two spindles have been derived to examine to what
extent the two spindles affect each other’s vibrations.
In order to prevent unwanted excited
vibrations and to secure better machining precision in large size heavy duty machine
tools dynamic stiffness is one of the most desirable and critical properties.
In the past decades, many researches on machine tool stiffness test and
evaluation methodology have been made. However any methodology for a Pin Turning
Device (PTD), which is a special kind of turning lathe for machining big size
crankshaft pins, is rarely found among them. This study proposes a test and
evaluation process of stiffness of a PTD by measuring frequency response
function at the tool center point (TCP). For conformance proving for the
proposed methodology, stiffness of a PTD obtained by the proposed method with
impact hammer test (IHT) has been compared with that determined by FEM.