Reloading system for pitch error correction data

Details Reloading system for pitch error correction data Reloading system for pitch error correction data

1991-01-02

1992-09-22

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

36447419, G05B 1925

Patent

active

051500256

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a reloading system for pitch error correction data in a numerically controlled machine tool, and more particularly, to a reloading system for pitch error correction data in which the pitch error correction data is reloaded, in accordance with a machining program, at the time of replacing a movable part.


BACKGROUND ART

In some numerically controlled machine tools, an attachment must be changed for each workpiece. Namely, if the workpiece is changed, the attachment must be replaced with a new one. If this attachment includes a movable part moved by a ball screw, a pitch error correction is required for each attachment, and thus pitch error correction data must be reloaded each time the attachment is replaced.
When reloading the pitch error correction data, however, usually a counter or the like, as hardware storing coordinate values, must be initialized, and thus the pitch error correction data must be reloaded while the numerical control device is disconnected from the power supply thereto. In general, although the operator can easily replace the attachment and the like, it is difficult to correctly reload the pitch error correction data after the replacement of the attachment, and therefore, the pitch error correction cannot be normally effected, and thus the machining accuracy is lowered.


DISCLOSURE OF THE INVENTION

The present invention has been contrived in consideration of these circumstances, and an object thereof is to provide a reloading system for pitch error correction data in which the pitch error correction data is reloaded, in accordance with a machining program, at the time of replacing a movable part.
To solve the above problem, according to the present invention, there is provided a system for reloading pitch error correction data at the time of replacing a movable part constituting part of a mechanical system of a numerically controlled machine tool, the pitch error correction data reloading system comprising giving a command to reload the pitch error correction data, in accordance with a machining program, at the time of replacing the movable part, whereby the pitch error correction data is reloaded at the time of the replacement of the movable part.
The command to reload the pitch error correction data is preset in a machining program at the time of replacing the movable part, and a numerical control device reads this command and automatically reloads the pitch error correction data. Accordingly, the operator need not perform any operation related to the reloading of the pitch error correction data, and the following machining can be effected with the use of correct pitch error correction data.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart showing processes in a pitch error correction data reloading system according to the present invention; and
FIG. 2 is a block diagram of the hardware of a numerical control device (CNC) for effecting the present invention.


BEST MODE OF CARRYING OUT THE INVENTION

One embodiment of the present invention will now be described with reference to the accompanying drawings.
FIG. 2 is a block diagram of the hardware of a numerical control device (CNC) for effecting the present invention. In FIG. 2, numeral 10 denotes the numerical control device (CNC). A processor 11, which is a central processor for the global control of the numerical control device (CNC) 10, reads out a system program in a ROM 12 through a bus 21, and executes the control of the entire numerical control device (CNC) 10 in accordance with this system program. A RAM 13 stores temporary calculation data, display data, etc.; an SRAM is used as the RAM 13. A CMOS 14 stores pitch error correction data, tool correction value, machining program, parameters, etc. The CMOS 14 also prestores pitch error correction data for each attachment. The CMOS 14, which is backed up by a battery (not shown), continues to act as a nonvolatile memory even when the numerical control device (CNC) 10 is cut off from the power supply, and thus all o

REFERENCES:
patent: 3852719 (1974-12-01), Nishumura et al.
patent: 4502108 (1985-02-01), Nozawa et al.
patent: 4514813 (1985-04-01), Nozawa et al.
patent: 4864508 (1989-09-01), Iwazaya

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