High accuracy machining station for a multiple spindle rotary in

Details High accuracy machining station for a multiple spindle rotary in High accuracy machining station for a multiple spindle rotary in

1994-04-15

1995-10-24

Bilinsky, Z. R.

Metal working

Plural diverse manufacturing apparatus including means for...

With means to feed work intermittently from one tool station...

29 38C, 82129, B23B 912, B23B 1304

Patent

active

054599156

ABSTRACT:
The invention relates to improvements in the multiple spindle rotary indexing machine tool systems of the prior art. Traditionally, such machine tool systems include a base and an upstanding vertical column which houses a plurality of machining stations each equipped with two-axis tool slides. In addition, the base supports a rotatable worktable, which carries a number of work-holding spindles. As the worktable rotates, these spindles are indexed through successive machining stations where a variety of operations are performed. In accordance with the invention, a spindle position measurement unit is provided to dynamically measure the exact location of each spindle indexed to position at a modified machining station. A computerized numerical control system calculates spindle position errors based on the position information provided by the measurement unit and offsets tool slide position commands to compensate for those errors. As a result, the control unit compensates for both fixed and variable spindle position variations, thus improving the machining tolerances of the machine tool apparatus. In accordance with another aspect of the invention, a high accuracy finishing station is provided which includes spindle position variation measurement and compensation in combination with an independent X and Y axis tool slide positioning system. The tool slide positioning system is responsive to CNC commands for speed control and position offset due to spindle errors.

REFERENCES:
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patent: 4197769 (1980-04-01), Smith et al.
patent: 4351096 (1982-09-01), Depweg et al.
patent: 4631684 (1986-12-01), Akasofu et al.
patent: 4642861 (1987-02-01), Riley et al.
patent: 5084660 (1992-01-01), Sasaki et al.
patent: 5182974 (1993-02-01), Cudini et al.

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