Process and device for controlling a machine tool in particular, and EDM machine

• US 5,940,301 A
• Filed: 04/10/1997
• Issued: 08/17/1999
• Est. Priority Date: 04/10/1996
• Status: Expired due to Term

• Current Assignee: AGI (Meadwestvaco Corporation)
• Original Assignee: A.G. Fur Industrielle Elektronik Agie
• Inventors: Robbiani, Fabrizio, Stoira, Luigi, Damman, Matthias, Pestoni, Paolo
• Primary Examiner(s): Grant, William
• Assistant Examiner(s): PATEL, RAMESH B
• Application Number:
  US08/843,644
• Time in Patent Office: 859 Days
• Field of Search: 364/474.01, 364/474.02, 364/474.04, 364/474.05, 364/474.07, 364/474.09, 364/474.2, 364/474.24, 364/474.22, 364/192, 364/191, 364/190 , 364/193, 395/99, 318/560-569, 318/571, 318/572, 219/69.12, 219/69.14, 219/69.17
• US Class Current: 700/159
• CPC Class Codes: G05B 19/4155 characterised by programme execution, i.e. part programme or machine function execution, e.g. selection of a programme
• CPC Class Codes: G05B 2219/34246 OOC object oriented control
• CPC Class Codes: G05B 2219/34247 Machining objects are hierarchically organised
• CPC Class Codes: G05B 2219/34248 Machining object comprises a slide, a palet, workpieces, machining, a contour
• CPC Class Codes: G05B 2219/34249 Sub divide machining object in machining groups, geometry, start point, special
• CPC Class Codes: G05B 2219/34355 List of failure events, list of actions, events, trigger actions
• CPC Class Codes: G05B 2219/45221 Edm, electrical discharge machining, electroerosion, ecm, chemical

Abstract

The invention pertains to a method and a device for controlling a machine tool, in particular an EDM machine, wherein the control data necessary for machining one or more workpieces is fed from the control device to the machine tool. Therein a list of action data for controlling special procedures (actions) and a list of event data for characterizing prescribed operating states (events), in particular, malfunctions, are permanently provided. The action and event data are linked in setting up the machine such that upon occurrence of one or more events, one or more actions are performed.

Claims

1. A method for controlling machine tools by a control device, wherein:

the control device (40) has available a list of event data (20) for characterizing prescribed operating states (events), in particular, malfunctions, and a list of action data for controlling special procedures (actions);

wherein the event and/or action data are respectively assigned to a machining object and/or operating mode of the machine tool, wherein the machining objects include at least the machine tool, a workpiece, and a machining operation, and wherein the operating modes include a machining mode, a simulation mode, and a set-up mode;

for a particular machining object and/or operating mode, the event data are selected and linked to action data such that upon occurrence of one or more events, one or more actions are performed in a prescribed sequence.

2. Method according to claim 1, characterized in that the machining objects of the machine tool are managed hierarchically by the control device (40) such that the action(s) belonging to one or more events of a hierarchically higher machining object also applies/apply to all machining objects situated below it.

3. Method according to claim 1 for controlling an erosive cutting machine, characterized in that the machining objects comprise the following elements:

the erosive cutting machine as such (2);

a workpiece table;

a pallet;

a group of workpieces;

a workpiece (4);

a machining operation (6.1, 6.2, 6.3); and

a cutting path

which are hierarchically subdivided and correspondingly managed.

4. Method according to claim 3, characterized in that the machining object--pertaining to a special machining operation--is further subdivided hierarchically into the elements:

several machining groups;

the machining in a special group;

an individual machining operation;

a special machining geometry;

a starting point;

as well as

a point on a path to be cut.

5. Method according to claim 3, characterized in that action data is provided for the following events:

beginning and end of a work sequence;

beginning and end of machining;

interruption of machining;

lack of a workpiece to be machined;

disruption in starting;

wire breakage;

short circuit;

collision of an electrode guide;

error in threading a wire electrode and/or error in the ISO program code.

6. Method according to claim 1, characterized in that the lists of event, action and/or object data are open, arbitrarily supplementable, lists.

7. Method according to claim 1, characterized in that the control device makes available a selection of possible actions for each event from the event list (20).

8. Method according to claim 1, characterized in that

by specifying a defined machining object and/or a defined operating mode of the machine tool, a preliminary selection is made in the event list and displayed on the display unit (50);

and

by selecting one or more events from the event list, a preliminary selection is made in the action list and displayed on the display unit (50).

9. Method according to claim 1, characterized in that additional individualizing features for characterizing individual operating parameters are assigned to the action and/or event data.