Gear cutting – milling – or planing – Gear cutting – Gear tooth shape generating
Patent
1998-09-11
2000-04-25
Briggs, William
Gear cutting, milling, or planing
Gear cutting
Gear tooth shape generating
409 10, 409 11, 36447402, B23F 106
Patent
active
060536764
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a machine tool for machining rotating workpieces by means of a tool, especially a fly cutter, rotatably driven in synchronization with the workpiece, for producing teeth, with workpiece drive and tool drive being kept in synchronism by respectively associated rotation transmitters by means of electronic control means, with a positioning motor being associated with one of the two drives for influencing the position of the phases of the two drives.
In a known device of this kind (DE 41 14 341 C2), the stator housing at least of the one motor is mounted concentrically with respect to the motor axis and is rotationally adjustable around this axis by means of the positioning motor. This means that the positioning motor is actively engaged forcewise in the power flow of the drive and must therefore be dimensioned to be sufficiently strong.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a machine tool of this type in a manner such that it is simple to manufacture and that the shifting of the phases can be achieved with low power requirement.
According to the invention a sensor element of one of the two rotation transmitters is rotationally shiftable relative to the stator of the corresponding drive motor.
As a result of such a formation, a machine tool according to the invention is obtained in which a change in the position of the phases, directed forward or backward, of the two drives present in synchronous operation is made possible with a reduced expenditure of force. The stator housing need no longer be adjusted rotatably to produce the change of the phases, but only the corresponding rotation transmitter. Therefore, the positioning motor can be designed to be small in terms of force. In practice, this appears so that in order to change the phases for example for producing a helical toothing, the sensor element of the rotation transmitter associated with the drive motor is adjusted rotatably depending on the pitch angle of the toothing. The synchronous control associated with both drive motors thus causes a re-synchronization while producing the phases-shifted synchronous operation of the drives. It is possible for the rotation-adjusting sensor element to be associated with the drive motor for the tool spindle. Alternatively, however, the sensor element of the rotation transmitter can be formed to be rotationally adjustable relative to the stator of the tool spindle drive motor. A modification of the concept according to the invention that is favorable from a constructive standpoint is characterized by the signal disc being arranged non-rotatably on the drive shaft separated from the drive motor and by the annular carrier being traversed freely rotatably by the shaft and being rotationally displaceable by the positioning motor. The annular carrier is the carrier for the adjustable sensor element. For the purpose of changing the condition of the phases in the synchronous operation of the tool drive and workpiece drive, the positioning motor effects a rotational displacement of the annular carrier. Initially, the synchronous operation of the drive motors that are driven electrically is re-regulated by means of the electronic control provided with such machine tools. Helical teeth can be produced by means of the formation according to the invention with an angle of maximum plus or minus 45.degree.. In its turn, the annular carrier is likewise provided with a signal disc that is scanned by the sensor that is secured to the housing. By means of this sensor, the angle of the phases can be detected by a CNC control so that the corresponding command can be input from the latter for the production of a helical toothing for example. If there is no rotational adjustment of the annular carrier together with the sensor element mounted thereon, straight teeth will be produced on the workpiece. By a corresponding control with respect to the rotational adjustment of the concerned sensor, nonlinear helical teeth could also be produced.
REFERENCES:
patent: 3984746 (1976-10-01), Dinsdale et al.
patent: 4708544 (1987-11-01), Faulstich et al.
patent: 4822219 (1989-04-01), Lunazzi
patent: 4850760 (1989-07-01), Okunishi
patent: 4865497 (1989-09-01), Faulstich
Garschagen Friedrich Albert
Heym Hans-Udo
Briggs William
Farber Martin A.
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