Wire electric discharge machine controller, wire electric discharge machine, and wire electric discharge machining method

Patent metadata

Field	Value
Publication number	US-9442479-B2
Application number	US-201314079176-A
Country	US
Kind code	B2
Filing date	Nov 13, 2013
Priority date	Nov 13, 2012
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

A wire electric discharge machining program is analyzed and a target shape for a workpiece is created. Multiple amounts of adjustment by which the amount of wire radius compensation for a wire electrode is adjusted are set. One or more desired ones are selected from the amounts of adjustment, and the amount of wire radius compensation is calculated by adding the selected amount(s) of adjustment to the amount of wire radius compensation. A machining route which is offset from the created target shape by the calculated amount of wire radius compensation is created.

First claim

The invention claimed is:

1. A wire electric discharge machining method for moving a wire electrode relative to a workpiece according to a machining program and machining the workpiece into a desired target shape, the method comprising the steps of:
analyzing the machining program;
creating a target shape for the workpiece based on a result of analysis of the machining program;
storing an amount of wire radius compensation for the wire electrode;
setting a plurality of amounts of wire radius compensation adjustment by which the amount of wire radius compensation for the wire electrode is adjusted;
storing the plurality of amounts of wire radius compensation adjustment that have been set;
selecting one or more desired amounts of wire radius compensation adjustment from the stored amounts of wire radius compensation adjustment;
computing an amount of wire radius compensation for machining route calculation by adding the selected amounts of wire radius compensation adjustment to the amount of wire radius compensation;
creating a machining route which is offset from the created target shape by the computed amount of wire radius compensation for machining route calculation; and
moving the wire electrode relative to the workpiece according to the created machining route.

2. The method according to claim 1 , wherein at least one of the plurality of amounts of wire radius compensation adjustment is set at the wire radius compensation adjustment amount setting step based on a dimensional difference between the desired target shape for the workpiece and an actually-machined shape of the workpiece.

3. The method according to claim 1 , wherein at least one of the plurality of amounts of wire radius compensation adjustment is set at the wire radius compensation adjustment amount setting step as a finishing allowance with respect to the desired target shape for the workpiece.

4. A controller for a wire electric discharge machine for moving a wire electrode relative to a workpiece according to a machining program and for machining the workpiece into a desired target shape, the controller comprising:
a storage; and
a processor, wherein
the storage is configured to store
the machining program, and
an amount of wire radius compensation for the wire electrode;

the processor is configured to
perform an analysis of the machining program stored in the storage,
create a target shape for the workpiece based on a result of the analysis of the machining program, and
set a plurality of amounts of wire radius compensation adjustment by which the amount of wire radius compensation for the wire electrode is adjusted;

the storage is further configured to
store the plurality of amounts of wire radius compensation adjustment set by the processor; and

the processor is further configured to
select one or more amounts of wire radius compensation adjustment from the plurality of amounts of wire radius compensation adjustment stored in the storage,
compute an amount of wire radius compensation for machining route calculation by adding the selected one or more amounts of wire radius compensation adjustment to the amount of wire radius compensation, and
create a machining route which is offset from the created target shape by the amount of wire radius compensation for machining route calculation that has been computed.

5. A wire electric discharge machine for machining a workpiece into a desired target shape, the wire electric discharge machine comprising:
a wire electrode;
a plurality of drive axes;
a storage; and
a processor, wherein
the storage is configured to store
a machining program, and
an amount of wire radius compensation for the wire electrode;

the processor is configured to
perform an analysis of the machining program stored in the storage,
create a target shape for the workpiece based on a result of the analysis of the machining program, and
set a plurality of amounts of wire radius compensation adjustment by which the amount of wire radius compensation for the wire electrode is adjusted;

the storage is further configured to
store the plurality of amounts of wire radius compensation adjustment set by the processor; and

the processor is further configured to
select one or more amounts of wire radius compensation adjustment from the plurality of amounts of wire radius compensation adjustment stored in the storage,
compute an amount of wire radius compensation for machining route calculation by adding the selected one or more amounts of wire radius compensation adjustment to the amount of wire radius compensation,
create a machining route which is offset from the created target shape by the amount of wire radius compensation for machining route calculation that has been computed, and
control the plurality of drive axes to move the wire electrode relative to the workpiece according to the created machining route for machining the workpiece.

6. The controller according to claim 4 , wherein the processor is configured to set at least one of the plurality of amounts of wire radius compensation adjustment based on a dimensional difference between the desired target shape for the workpiece and an actually-machined shape of the workpiece.

7. The controller according to claim 4 , wherein the processor is configured to set at least one of the plurality of amounts of wire radius compensation adjustment as a finishing allowance with respect to the desired target shape for the workpiece.

8. The wire electric discharge machine according to claim 5 , wherein the processor is configured to set at least one of the plurality of amounts of wire radius compensation adjustment based on a dimensional difference between the desired target shape for the workpiece and an actually-machined shape of the workpiece.

9. The wire electric discharge machine according to claim 5 , wherein the processor is configured to set at least one of the plurality of amounts of wire radius compensation adjustment as a finishing allowance with respect to the desired target shape for the workpiece.

Assignees

• Fanuc Corp

Inventors

• Kobayashi Masanori
• Suzuki Koji

Classifications

• B23H7/06

  Control of the travel curve of the relative movement between electrode and workpiece · CPC title

• B23H7/20

  for program control, e.g. adaptive · CPC title

• G05B2219/50331

  Electrode, wire gap compensation in edm, wire cutting · CPC title

• G05B19/18 Primary

  Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form (G05B19/418 takes precedence) · CPC title

• G05B19/404 Primary

  characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia (G05B19/19, G05B19/41 take precedence) · CPC title