Numerical control apparatus
First Claim
1. A numerical control apparatus for controlling a numerically controlled machine tool such as a hobbing machine, comprising:
- a synchronization control means having an axis control circuit for converting feedback pulses supplied from a position coder connected to a spindle axis for rotating a hob by a command including a ratio of an rpm of said spindle axis to an rpm of a rotation axis for rotating a gear to be cut, and for outputting a rotation command to a spindle motor and a rotation command in pulses to said rotation axis, a first internal counter for counting the feedback pulses supplied from said position coder, and a second internal counter for counting the pulses of the rotation command given to said rotation axis;
a correction pulse calculation means for calculating correction pulses for maintaining a new synchronous relationship without stopping the rotation of said spindle axis and said rotation axis when a command for a new rpm of said spindle axis and a command for a new rpm of said rotation axis are input.
1 Assignment
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Accused Products
Abstract
Disclosed is a numerical control apparatus for controlling a numerically controlled machine tool such as a hobbing machine and the like. An axis control circuit (14) provided with a synchronization control means (8) controls the rpm of a spindle motor (5) and the rpm of a servo motor (11) based on feedback pulses supplied from a position coder (7) connected to a hob axis (3), so that a ratio of the rpm of the hob axis (3) to the rpm of a C-axis (13) has a given value. A first internal counter (15a) monitors the number of feedback pulses supplied from the position coder (7) and a second internal counter (15b) monitors the number of pulses distributed to the C-axis (13), and when a ratio of the rpm of the hob axis (3) to the rpm of the C-axis (13) is to be changed, a correction pulse calculation means (9) calculates correction pulses based on the number of rotation pulses of the hob axis (3) and the number of the rotation pulses of the C-axis (13) counted by the first and second internal counters (15a, 15b). The correction pulses are supplied to the C-axis (13) to accelerate or decelerate the rpm of the C-axis (13) and thereby achieve a new synchronous relationship between the hob axis (3) and the C-axis (13) during the rotation of the hob axis (3) and C-axis (13).
23 Citations
4 Claims
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1. A numerical control apparatus for controlling a numerically controlled machine tool such as a hobbing machine, comprising:
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a synchronization control means having an axis control circuit for converting feedback pulses supplied from a position coder connected to a spindle axis for rotating a hob by a command including a ratio of an rpm of said spindle axis to an rpm of a rotation axis for rotating a gear to be cut, and for outputting a rotation command to a spindle motor and a rotation command in pulses to said rotation axis, a first internal counter for counting the feedback pulses supplied from said position coder, and a second internal counter for counting the pulses of the rotation command given to said rotation axis; a correction pulse calculation means for calculating correction pulses for maintaining a new synchronous relationship without stopping the rotation of said spindle axis and said rotation axis when a command for a new rpm of said spindle axis and a command for a new rpm of said rotation axis are input. - View Dependent Claims (2, 3, 4)
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Specification