Boots – shoes – and leggings
Patent
1991-11-21
1993-11-09
Smith, Jerry
Boots, shoes, and leggings
36447402, 36447412, 409 2, B23F 100, G05B 1921
Patent
active
052608794
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a numerical control apparatus for controlling a numerically controlled (NC) gear cutting machine such as a hobbing machine and the like, and more specifically, to a numerical control apparatus for controlling an NC gear cutting machine by which a synchronous relationship between the spindle axis of a hob and the rotation axis of a gear to be cut is changed without canceling the synchronization.
2. Background Art
A hobbing machine for cutting a gear is used in combination with a numerical control apparatus, and in the hobbing machine, a spindle axis (hereinafter, referred to as a hob axis) must be synchronized with the rotation axis (hereinafter, referred to as a C-axis) of a gear to be cut (hereinafter, referred to as a workpiece), and accordingly, feedback pulses supplied from the position coder equipped with the hob axis are distributed to the C-axis at a given ratio.
Nevertheless, since the NC hobbing machine does not monitor the number of pulses of the hob axis and C-axis, which are always synchronized, the synchronous relationship therebetween must be changed after the synchronization once has been canceled, and as a result, the rotation of the C-axis is stopped, and thus a cutting start point must be located when a plurality of gears having a different module must be cut.
To overcome the above drawback, the applicant filed Japanese Patent Application No. Hei 1-337058 entitled "Numerical Control Apparatus".
Although this invention enables a change in an NC hobbing machine of the synchronous relationship of a synchronized hob axis and a C-axis without canceling the synchronization, a considerable amount of time must pass before a new synchronization is achieved after a synchronization change command has been issued.
Note, an NC hobbing machine provided with a plurality of hobs for cutting a plurality of workpieces is often used, and in this type of hobbing machine, the synchronization must be changed as quickly as possible.
DISCLOSURE OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a numerical control apparatus for controlling an NC gear cutting machine by which a change to a new synchronous relationship between a hob axis and a C-axis without canceling the synchronization can be achieved within one rotation of the hob axis.
To attain the above object, according to the present invention, there is provided a numerical control apparatus for controlling a numerically controlled machine tool such as a hobbing machine and the like, which comprises a synchronization control means having an axis control circuit for converting feedback pulses from a position coder connected to a spindle axis for rotating a hob by a command including a ratio of the rpm of said spindle axis to the 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 to said rotation axis, a first internal counter for counting the feedback pulses from said position coder and a second internal counter for counting the rotation command to be given to said rotation axis, and a correction pulse calculation means for calculating a correction pulse for maintaining a new synchronous relationship without stopping the rotation of said spindle axis and said rotation axis when commands for a different rpm of said spindle axis and an rpm of said rotation axis are input.
The axis control circuit provided with a synchronization control means controls the rpm of the spindle motor and the rpm of a C-axis based on the feedback pulses supplied from the position coder connected to the hob axis, so that a ratio of the rpm of the hob axis to the rpm of a C-axis has a given value. Further, the first internal counter constantly monitors the number of feedback pulses supplied from the position coder and the second internal counter constantly monitors the number of pulses distributed to the C-axis.
When a ratio of the rpm of the hob axis to the rpm of the C-axis is to be
REFERENCES:
patent: 4414495 (1983-11-01), Sumi et al.
patent: 4585377 (1986-04-01), Nozawa et al.
patent: 4695960 (1987-09-01), Reimann et al.
patent: 5037252 (1991-08-01), Hasegawa et al.
Fujibayashi Kentaro
Ogino Hideo
Otsuki Toshiaki
Sasaki Takao
Fanuc Ltd
Garland Steven R.
Smith Jerry
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