WO1991010530A1 - Wire tension controlling apparatus - Google Patents
Wire tension controlling apparatus Download PDFInfo
- Publication number
- WO1991010530A1 WO1991010530A1 PCT/JP1991/000052 JP9100052W WO9110530A1 WO 1991010530 A1 WO1991010530 A1 WO 1991010530A1 JP 9100052 W JP9100052 W JP 9100052W WO 9110530 A1 WO9110530 A1 WO 9110530A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wire tension
- wire
- tension
- voltage
- brake device
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/104—Wire tension control
Definitions
- the present invention relates to a wire-cut electric discharge machine, and particularly to a wire having a function of displaying an alarm message when an abnormality occurs in a brake device for generating a wire tension.
- the present invention relates to a tension control device.
- Feedback control of wire tension in a wire-cut electric discharge machine that generates wire tension by applying power to the running wheels using, for example, an electromagnetic brake device is what is called. It is known.
- the electric discharge machine disclosed in International Publication No. WO 89Z0731 (corresponding to Japanese Patent Application Laid-Open No. Hei 11-199726) is rotated by a swingable cantilever.
- the load applied to the cantilever via the freely supported wire guide is detected as wire tension by a mouth cell, and the deviation between the detected wire tension and the set wire tension is detected.
- Feedback control is performed to control the actual wire tension to the set value by controlling the braking force in accordance with.
- An object of the present invention is to provide a wire tension control device that displays an alarm message when an abnormality has occurred in a brake device and that can easily determine the abnormality of the brake device. .
- the wire from the brake device to the wire is set so that the wire tension actually becomes the set wire tension.
- a shear tension control device for a jet electric discharge machine that performs feedback control of an applied braking force.
- the wire tension control device includes a determination unit configured to determine whether a ratio of the detected wire tension to the set wire tension is lower than a predetermined ratio, and an alarm message that indicates an abnormality of the brake device.
- an alarm message indicating an abnormality of the brake device when the ratio of the detected wire tension to the set wire tension falls below a predetermined ratio, an alarm message indicating an abnormality of the brake device. Display With this configuration, it is possible to determine the presence or absence of an abnormality in the brake device without frequently measuring wire tension, and to prevent a reduction in machining accuracy due to a decrease in wire tension due to an abnormality in the brake device.
- the single drawing is a circuit diagram showing a main part of a wire tension control device according to one embodiment of the present invention.
- the wire-cut electric discharge machine transfers the wire sent out from the wire supply bobbin to a wire path consisting of a pinch roller, a brake roller, a guide roller, and upper and lower guides.
- electric discharge machining is performed by generating an electric discharge between the wires and the work.
- the electric discharge machine includes an electromagnetic brake device shown by reference numeral B in the attached drawings for braking a brake roller and applying a braking force to the wire to generate wire tension, and a cantilever.
- a wire tension detecting device having: The cantilever is rotatably supported at one end, rotatably supports the wire guide roller at the other end, and detects pressure of the load cell LC as a tension detector in the middle. Supported by the department.
- the electric discharge machine has a built-in numerical controller CNC for controlling the operation of the electric discharge machine and transmitting a command voltage Tc representing a set wire tension, and a detecting wire tension.
- the electromagnetic brake device B is driven in accordance with the output voltage Tf of the tension detector representing the A wire tension control device is provided for feedback control of wire tension to the set wire tension.
- the numerical control device CNC has a manual data input device MDI with a CRT display device, and also functions as a display control means of a tension controller for controlling the operation of the display device.
- the wire tension control device includes a first differential amplifier 1 as a differential amplifier 1 for outputting a deviation between a set wire tension voltage Tc and a detected wire tension voltage Tf.
- Op-amp OP 1 a second op-amp OP 2 as an amplifier 2 for amplifying the output of the op-amp 0 P 1, and an exciting current flowing through an exciting coil of the electromagnetic brake device B.
- the operational amplifier OP1 has a first input terminal connected to the output circuit of the numerical controller CNC via a resistor R1 and a load cell LC via a resistor R2. 2 Input terminal is grounded via resistor R4.
- the output terminal of the first op-amp OP 1 is connected to the first input terminal of the amplifier via a resistor R 3 and the first input terminal of the second op-amp 0 P 2 via a resistor R 5. It is connected to the.
- the second operational amplifier OP2 has a second input terminal grounded via a resistor R7, an output terminal connected to the first input terminal of the amplifier via a resistor R6, and a resistor R8.
- the collector of the transistor Q is connected to the other end of the exciting coil of the electromagnetic brake device B whose one end is connected to the power supply + V a, and the collector of the second op-amp OP 2 1 Input terminal
- the connection point of the transistor Q and the emitter of the transistor Q is grounded via the resistor R9.
- the wire tension control device has a third op amp 0 P 3 as an inverting amplifier 4 for inverting the sign of the set wire tension voltage T c and a resistance value ratio of, for example, 9: 1 to 8: 2 Resistors R10 and Rl1 Op-amp 0 Voltage divider for obtaining 10% to 20% of the output voltage of P3, and voltage divider output voltage , For comparing the detected wire tension voltage T f with the detected wire tension voltage T f. It has a data CP.
- the third op-amp OP 3 has a first input terminal connected to the output circuit of the numerical controller via a resistor R 14, a second input terminal grounded, and an output terminal connected to a resistor R 1.
- the c comparator CP When connected to 0 and connected to the first input terminal via the resistor R 15, the c comparator CP has the first input terminal connected to the load cell LC and the second input terminal. The terminal is connected to the connection point between resistor R10 and resistor R11. One end of the resistor R11 is grounded. The output terminal of the comparator CP is connected to the power supply + Vb via the resistor R12, and the light emitting diode of the photocoupler 3 whose anode is connected to the power supply + Vb. Connected to the cathode of node 3-1 via inverter I1 and resistor R13.
- the phototransistor 3 — 2 of the photocoupler 3 has a collector connected to the power supply + Vc, an emitter connected to the input circuit of the numerical controller, and a cathode. Is connected to the diode of the diode D connected to the power supply + Vc.
- the operator operates the keyboard of the manual data input device MDI to set the setting key tension in the numerical controller CNC and then starts the electric discharge machine.
- the output of the first operational amplifier OP1 which indicates the difference between the set wire tension voltage Tc from the numerical controller CNC and the detected wire tension voltage Tf from the load cell LC. Is applied to the transistor Q via the second operational amplifier OP2.
- an exciting current corresponding to the deviation voltage Tc-Tf flows through the exciting coil of the electromagnetic brake device B, and a braking force is applied to the traveling wire by the brake device B, so that the braking force is applied.
- Ear tension occurs.
- the wire tension acts on the force lever via the guide roller provided at one end of the force lever, causing the force lever to swing, and corresponding to the actual wire tension on the load cell LC.
- a load is applied, and a detected wire tension voltage Tf corresponding to the load is transmitted from the load cell.
- the detection wire tension voltage T f is applied to the first operational amplifier 0 P 1 and also to the first input terminal of the comparator CP.
- the second input terminal of the comparator CP is connected to the voltage divider output voltage having a magnitude opposite to that of the set wire tension voltage Tc through a third operational amplifier 0 P3 and having a magnitude of 10% to 20%. Is applied.
- the wire tension is actually controlled to be equal to the set wire tension, and therefore, the first input terminal of the comparator CP.
- a low-level output is sent from the comparator CP, and therefore, the output of the inverter I1 goes high.
- the light emitting diode 3-1 of the photocoupler 3 is deactivated, and no current flows through the phototransistor 3-2 of the photocoupler 3.
- the wire tension becomes 10 times the set wire tension. It will be greatly reduced to less than%.
- the detection wire tension voltage Tf falls below the voltage divider output voltage, a high-level output is sent from the comparator CP, and the output of the inverter I1 goes low.
- a drive current flows through the light-emitting diodes 3-1 and the light-emitting diodes emit light.
- current flows through the phototransistor 3-2, in other words, an alarm signal indicating an abnormality of the brake device B is sent from the photocab 3 to the input circuit of the numerical control device CNC.
- the numerical controller CNC periodically executes a routine to monitor the presence or absence of an alarm signal during the operation of the electric discharge machine, and the brake is displayed on the CRT screen of the display device according to the alarm signal. Display an alarm message indicating that an error has occurred in the device. In light of this message display, check or replace the electromagnetic brake device B at least once.
- the word cell was used, but another tension detector may be used.
- the voltage dividing ratio of the set wire tension voltage Tc may be variably set by using a variable resistor for one or both of the resistors R10 and R11 constituting the voltage divider. Further, the operation of the electric discharge machine may be automatically stopped in response to an alarm signal from the photocoupler.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007187A JPH03213215A (ja) | 1990-01-18 | 1990-01-18 | ワイヤ張力制御装置 |
JP2/7187 | 1990-01-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991010530A1 true WO1991010530A1 (en) | 1991-07-25 |
Family
ID=11659051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1991/000052 WO1991010530A1 (en) | 1990-01-18 | 1991-01-18 | Wire tension controlling apparatus |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0463178A4 (ja) |
JP (1) | JPH03213215A (ja) |
WO (1) | WO1991010530A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8907243B2 (en) * | 2009-04-07 | 2014-12-09 | Mitsubishi Electric Corporation | Maintenance system for wire transport system of wire discharge processing machine |
JP6169557B2 (ja) | 2014-12-26 | 2017-07-26 | ファナック株式会社 | 張力監視機能を有するワイヤ放電加工機 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57178619A (en) * | 1981-04-30 | 1982-11-02 | Sodeitsuku:Kk | Wire cut electric discharge machining device |
JPS58202726A (ja) * | 1982-05-17 | 1983-11-26 | Makino Milling Mach Co Ltd | ワイヤカツト放電加工機のワイヤ電極断線検出装置 |
JPS63256316A (ja) * | 1987-04-13 | 1988-10-24 | Mitsubishi Electric Corp | ワイヤ放電加工装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01199726A (ja) * | 1988-02-03 | 1989-08-11 | Fanuc Ltd | ワイヤ張力,断線検出制御装置 |
-
1990
- 1990-01-18 JP JP2007187A patent/JPH03213215A/ja active Pending
-
1991
- 1991-01-18 WO PCT/JP1991/000052 patent/WO1991010530A1/ja not_active Application Discontinuation
- 1991-01-18 EP EP19910902744 patent/EP0463178A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57178619A (en) * | 1981-04-30 | 1982-11-02 | Sodeitsuku:Kk | Wire cut electric discharge machining device |
JPS58202726A (ja) * | 1982-05-17 | 1983-11-26 | Makino Milling Mach Co Ltd | ワイヤカツト放電加工機のワイヤ電極断線検出装置 |
JPS63256316A (ja) * | 1987-04-13 | 1988-10-24 | Mitsubishi Electric Corp | ワイヤ放電加工装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0463178A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0463178A4 (en) | 1992-08-19 |
EP0463178A1 (en) | 1992-01-02 |
JPH03213215A (ja) | 1991-09-18 |
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