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Abstract: Based on MBS (Multi-body system), an error model is
presented here for the thermal errors in machining centers as well as
the related compensation method. Taking three-axis MAKINO machining
center as an example, a specific error model is set up through
theoretically analyzing and experimentally parameter-identifying. Four
temperature sensors are selected after optimization, and the temperature
changes from their readings offered as the inputs to the error parameter
models. Then a real-time software compensation is carried out, a set of
small surfaces are cut on the machining center along thex, y and
z-axis with and without error compensation. The measurement results from
CMM show an obvious improvement is obtained after the real-time
compensation. Thus the facts above verified the validity and feasibility
of this error model and compensation method.
Key
words: Multi-body system theory Machining center Thermal
error Compensation technique
CLC No: TG659
国家“九五”攀登计划预选项目(PD9521910).
Received 20010330, received
in revised form 20010810 |