Machine tool and numerical control apparatus for controlling the same

Patent metadata

Field	Value
Publication number	US-9821394-B2
Application number	US-201414517208-A
Country	US
Kind code	B2
Filing date	Oct 17, 2014
Priority date	Oct 18, 2013
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

In wire-electrical discharge machine and a numerical control apparatus thereof and a numerical control apparatus for controlling a machine tool, optional minute blocks are automatically created in front of and behind a connecting point, i.e., a joint of a block to which an offset command is instructed, and an offset value is exchanged between the minute blocks so that a correct offset value is set in a desired block.

First claim

The invention claimed is:

1. A numerical control apparatus of a wire-electrical discharge machine for electrical discharge machining a work by a wire electrode line along a machining path including a taper angle or a taper machining amount correction amount, the numerical control apparatus comprising:
a unit configured to, when a taper angle or a taper machining amount correction amount instructed in a first front block in two successive contact machining path blocks is different from a taper angle or a taper machining amount correction amount instructed in a second rear block in said two successive contact machining path blocks,
automatically add a block that divides the first front block and the second rear block, wherein the added block is
from a first point by a first distance in front of a connecting point of the first front block and the second rear block,
to a second point by a second distance behind the connecting point, and

gradually change the taper angle or the taper machining amount correction amount, from the taper angle or the taper machining amount correction amount instructed in the first front block to the taper angle or the taper machining amount correction amount instructed in the second rear block, in the added block between the first and second points, wherein the numerical control apparatus is configured to control the wire-electrical discharge machine to perform electrical discharge machining along the machining path in accordance with the first front block, the added block and the second rear block.

2. A wire-electrical discharge machine, comprising the numerical control apparatus according to claim 1 .

3. A numerical control apparatus of a wire-electrical discharge machine for electrical discharge machining a work by a wire electrode line along a machining path including a taper angle or a taper machining amount correction amount, the numerical control apparatus comprising:
a unit configured to, when a taper angle or a taper machining amount correction amount instructed in a first front block in two successive contact machining path blocks is different from a taper angle or a taper machining amount correction amount instructed in a second rear block in said two successive contact machining path blocks,
automatically add a block
from a first point by a first distance in front of a connecting point of the first front block and the second rear block to the connecting point, or
from the connecting point to a second point by a second distance behind the connecting point, and

gradually change the taper angle or a taper machining amount correction amount, from the taper angle or the taper machining amount correction amount instructed in the first front block to the taper angle or the taper machining amount correction amount instructed in the second rear block, in the added block, wherein the numerical control apparatus is configured to control the wire-electrical discharge machine to perform electrical discharge machining along the machining path in accordance with the first front block, the added block and the second rear block.

4. A wire-electrical discharge machine, comprising the numerical control apparatus according to claim 3 .

Assignees

• Fanuc Corp

Inventors

• Hasegawa Yasuo

Classifications

• G05B2219/45043

  EDM machine, wire cutting · CPC title

• B23H7/02

  Wire-cutting · CPC title

• G05B19/182 Primary

  characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control (G05B19/21 - G05B19/40 take precedence) · CPC title

• G05B2219/50335

  Tool offset for straight lines · CPC title

• B23H7/06

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