Abstract
Abstract
: NC lathe can do boring, facing, drilling and Reaming in addition to turning.The
use of lathes in the production than the other types of machine tools and more. And compared
to other types of machine tools, lathes in the production is the most widely used.
In this design ,the development and current situation of NC machine in China was
introduced and a series of problems were presented .The development trend to NC lathe was
discussed.Some countermeasures was presented for the development of NC machine in China
and then the headstock of ck6125NC lathe has been calculatly designed . Headstocks is
composed of the hollow spindle which is installed in precision bearings and a series of
transmission gears. The spindle can obtain any speed in the speed range to meet the processing
requirements of cutting.
At present, the development trend is to provide a continuously variable speed through the
electrical or mechanical devices . Variable Frequency Motor conveys the power through belt
drive and a set of transmission gears. The speed range of Variable Frequency Motor is usually 3-5
, which is difficult to meet the speed range requirements of the spindle speed; The transmission
gears is to expand the scope of a variable-speed to meet the speed range of the spindle .
In addition, in this design the design of the belt drive has been changed from the original
unloading structure into the loading structure, transmissed the force to the lathe body so that
input shaft is only forced torque, improved the forcing state of the input shaft.
Key words: headstocks, a continuously variable speed , transmission Systerm