Page 21 - May

METALWORKING EQUIPMENT AND TOOLS
Design of new generation gear hobbing

machines based on mechatronic modules

The article describes the design of gear hobbing machines using mechatronic
modules. An analysis of existing built-in motors has been carried out by
Siemens, the boundaries of their use in
vertical and horizontal hobbing machines
as drives for cutters and work pieces.

At present, the most stable
direction in the development of metal-
cutting machine tools is the widespread
use of mechatronic systems, when in CNC
machines, motor spindles are used in the
drives of the main movement, tracking
mechatronic drives of feeds, rotary and
globe tables, etc. [2], [3].
The most complete solution for
the creation of mechatronic devices for
metal-cutting machine tools is the use of so-called direct drives to implement the movement of
the executive body. In this case, the source of motion is located directly on the working body
of the machine and between it and the end link carrying the tool or work piece, there are no
intermediate gears (gear, belt), as well as couplings. Consequently, clearances in gears are
eliminated and high rigidity is provided when transferring rotation from the motor to the work
piece and the tool.
For example, in gear hobbing machines, thanks to the use of direct drives for rotation of
the work piece and cutter, many complex tasks are solved, including:
● precise gear transmission of the work piece rotation drive is excluded, which has a decisive
effect on the kinematic accuracy, which does not change the entire service life of the machine;
● reducers or reduction gears in the cutter drive and various mechanisms to eliminate gaps in
the joints transmitting rotation from the motor to the cutter are excluded.
This article presents the results of a study of the possibility of using direct drives for
rotation of the work piece and cutter in vertical (according to GOST 659-89) and horizontal
(according to GOST 18065-91) gear hobbing machines.

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