ELECTRO-ERODING MACHINE WITH A CIRCUIT FOR THE CONTROL OF AT LEAST ONE ADVANCING DEVICE FOR A WIRE ELECTRODE AND/OR FOR A WORKPIECE

• US 3,731,044 A
• Filed: 06/23/1971
• Issued: 05/01/1973
• Est. Priority Date: 06/23/1971
• Status: Expired due to Term

• Current Assignee: Arno Sieg, Costantino Tadini, Laszlo Rabian, Peter Suter, Rudolf Panschow, Silvano Mattei, Volker Suhr, Werner Ullmann, Wolfgang Meyer
• Original Assignee: Arno Sieg, Costantino Tadini, Laszlo Rabian, Peter Suter, Rudolf Panschow, Silvano Mattei, Volker Suhr, Werner Ullmann, Wolfgang Meyer
• Inventors: Mattei, Silvano, Sieg, Arno, Tadini, Costantino, Ullmann, Werner, Rabian, Laszlo, Suter, Peter, Panschow, Rudolf, Suhr, Volker, Meyer, Wolfgang
• Primary Examiner(s): Staubly, R. F.
• Application Number:
  US05/156,007
• Time in Patent Office: 678 Days
• Field of Search: 219/69C,69G,69P,69R,69V 204/143M
• US Class Current: 219/69.12
• CPC Class Codes: B23H 7/06 Control of the travel curve of the relative movement between electrode and workpiece

Abstract

This invention relates to an electro-eroding machine with a circuit for the control of at least one advancing device for a wire electrode and/or for a workpiece in a workpiece contour predetermined by data stored in an information carrier, the said data being converted, in consideration of the diameter of the wire electrode and the width of the operating gap, into the path curve of the axis of the wire electrode in consideration of the erosive condition in the operating gap. The information carrier comprises two computing units, one supplying control signals to driving means for advancing the wire electrode for a straight movement while the other supplies control signals to driving means for producing rotary movement. Each computing unit includes return memories which return the wire electrode by a certain length of the path curve in the event of trouble in the operating gap.

Claims

1. An electro-eroding machine with a circuit for the control of at least one advancing device for a wire electrode and/or a workpiece to a workpiece contour predetermined by data stored in an information carrier, the said data being converted, considering the diameter of the wire electrode, the erosive condition in the operating gap and the width of the operating gap, into the path curve of the axis of the wire electrode, characterized by the fact that at least two computing units are provided which calculate the path curve of the axis of the wire electrode on the strength of the converted data and a predetermined programme, of which the first computing unit supplies control signals, by means of an interpolating process, to driving means of the advancing device for a straight movement while the other computing unit supplies control signals, by an interpolation process, to driving means of the advancing device for a rotary movement, each computing unit comprising return memories which return the wire electrode by a certain length of the path curve in the event of trouble in the operating gap.

2. An eroding machine according to claim 1 characterized by the fact that a control circuit is provided for setting a certain angle between the wire electrode and the surface of the workpiece, the said control circuit being supplied with the data for the angular adjustment via a second circuit by the information carrier or by an input.

3. An eroding machine according to claim 2 characterized by the fact that the control circuit connected to the second circuit and a monitoring device supplies its control signals to a driving motor of a holding device for the wire electrode.

4. An eroding machine according to claim 2 characterized by the fact that the control circuit supplies its output signals to computing units, each computing unit being associated with an advancing device and that each computing unit can be influenced by a monitoring device.

5. An eroding machine according to claim 1 characterized by the fact that a correcting computing unit is provided which converts the data determining the workpiece configuration is consideration of the diameter of the wire electrode and the width of the operating gap into corrected data for the path curve, the correcting computing unit being connected to a manual input or with the second circuit for the supply of the wire diameter and the gap width.

6. An eroding machine according to claim 1 characterized by the fact that the second circuit is provided between the information carrier input, a correcting computing unit, the control circuit, the monitoring device and the erosion generator for the supply of the data for the angular adjustment and the data for the control of the electrical parameters on the erosion generator.

7. An eroding machine according to claim 1 Characterized by the fact that the memories are designed as return memories and that each computing unit has associated therewith a return memory, each return memory being so adjusted that it stores the control signals supplied by the associated computing unit to the driving motors and supplies, by a trouble signal from a monitoring device which stops the control signals coming from the computing unit, the control impulses of the last length of the curve path to the driving motors so that the wire electrode returns by a certain length.

8. An eroding machine according to claim 1 characterized by the fact that the memories of each computing unit are arranged to store the characteristic points of the curve path and adjusted so that, in the presence of a trouble signal supplied by a monitoring device which interrupts the supply of the control impulses from the computing unit for the further erosive advance of the wire electrode, the stored characteristic points are interpolated in the inverse order and supplied to the driving motors so that the wire electrode returns by a certain length.

9. An eroding machine according to claim 1 characterized by the fact that an indexing unit is arranged between the correcting computing unit and the circuit designed as a conicity computing unit, the said indexing device being designed for the displacement of the system of coordinates.

10. An eroding machine according to claim 1 characterized by the fact that a monitoring device is provided which, in the event of changes in conditions in the operating gap, influences the electrical parameters of the eroding generator, the return memories, and the computing units.

11. An eroding machine according to claim 1 characterized by the fact that the advancing device designed as a cross-table which comprises, for the straight movement, at least one mobile component displaceable in the direction of one coordinate, the wire guides of the wire electrode being attached to the one mobile component while the advancing device for the rotary movement designed as a rotary table is attached to the other mobile portion.

12. An eroding machine according to claim 1 characterized by the fact that the advancing device for the straight movement consists of the two cross-tables and that the one wire guide for the wire electrode is attached to one cross-table and the other wire guide for the wire electrode is attached to the other cross-table, and the advancing device for the rotary movement is designed as a cross-table accommodating the workpiece.

13. An eroding machine according to claim 12 characterized by the fact that the first computing unit is connected to the computing units for the cross-tables and with the monitoring device.

14. An eroding machine according to claim 1 characterized by a holding device with a cross-table at each wire guide for the adjustment of the plane defined by the conicity relative to the direction of cutting of the wire electrode, and a driving motor controlled by the computing unit actuating the cross-tables.