Method and apparatus for the synchronization of a gear machining apparatus
AssigneeReishauer AG
InventorArthur Angst
Life of this patent
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Abstract
This invention concerns a method for the synchronization of a gear machining instrument that works according to the hobbing method. It has different drives for the tool and the work-piece. In the process, a series of pulses are produced, dependent upon the rotational speed of each drive. The occurrence of the pulses are compared digitally resulting in an analog control signal for the adjustment of the work-piece drive.
Claims9
In a method for the synchronous control of a gear machining device working according to the hobbing method, the device having a separate tool drive and a separate work-piece drive, means for producing a first and second series of pulses dependent upon the rotational speed of the tool drive and work-piece drive respectively, means for digitally processing said first and second series of pulses to produce a comparison signal, means for deriving an analog control signal for the adjustment of the work-piece drive from said comparison signal, the control method comprising the steps of:
- continuously forming a digital difference between:
- (i) the number of pulses of said first series, divided by the number of teeth of said work-piece and (ii) the number of the pulses of said second series to provide a difference count, wherein the number of pulses of said second series is formed continuously, and the number of pulses of said first series per unit time is greater by a multiple than the number of pulses of said second series in the same unit time;
- counting the pulses of said first series in the time interval between two subsequent pulses of the second series to form a pulse count;
- converting said difference count and said pulse count separately into first and second analog signals, respectively;
- and,
- summing said first and second analog signals for the formation of said analog control signal, whereby, the first and second analog signals are dependent upon the reciprocal of the number of teeth of said work-piece.
In an apparatus for the synchronous control of a gear machining device, said device having separate work-piece and tool drives, a pulse-generating angular encoder associated with said tool drive and said work-piece drive respectively, the improvement comprising:
- an adjustable dividing counter connected to an output of said angular encoder of said tool drive, digital adjustment means associated with said dividing counter for adjusting said dividing counter according to the number of teeth of the work-piece, said dividing counter providing at a first output thereof a pulse signal upon reaching an adjusted count level and being reset automatically thereby, said dividing counter continuously providing at a second output thereof the current digital count state, a balance counter having two inputs and an output, said first output of said dividing counter and an output of said angular encoder of said work-piece drive each being connected to one respective input of said balance counter, first and second gate means each having a signal input, a control input and an output, the output of said balance counter and said second output of the dividing counter being connected respectively to the signal input of one of the first and second gate means, the control inputs of the first and second gate means simultaneously having pulses from said angular encoder of said work-piece drive supplied thereto for passing respective signal input pulses from the output of said balance counter and said second output of said dividing counter, first and second digital storage units connected, respectively, to the outputs of the first and second gate means, first and second digital-to-analog converters connected respectively to the first and second storage units, the outputs of said digital-to-analog converters being additively connected to each other to form an analog control signal, means to supply a constant reference current to the digital-to-analog converter receiving the output signal from said first storage unit connected to the output of the balance counter and, means to supply a reference current proportional to the reciprocal of the number of teeth of said work-piece to said second digital-to-analog converter receiving the output signal from said second storage unit connected to the second output of the dividing counter.
Dependencies are inferred from the claim text.