JP3224375U - Wire electrical discharge machine - Google Patents

Abstract

An object of the present invention is to provide a wire electric discharge machine capable of automatically changing a predetermined current pulse OFF time and quickly releasing a short-circuit state. Kind Code: A1 A wire electric discharge machine is configured to detect a short circuit between a wire electrode, a bed, a cross table, a table, and a wire electrode and a workpiece during electric discharge machining. The configuration includes a detection unit for detecting and a control device 100 for controlling the processing. The control device 100 includes a storage unit in which the current pulse ON time and the current pulse OFF time of the processing power supply 80 are stored, and based on the predetermined current pulse ON time and the predetermined current pulse OFF time. When processing of the workpiece is controlled and the detection unit detects that a short circuit has occurred between the wire electrode E and the workpiece W, the cross table 30 is stopped and the current pulse OFF time is reduced. Change from a predetermined current pulse OFF time. [Selection diagram] Fig. 1

Description

  The present invention relates to a wire electric discharge machine that performs a removal process using an electric discharge phenomenon.

  Conventionally, in a wire electric discharge machine, a plurality of current pulse ON times and current pulse OFF times are stored in advance as high-frequency parameters, and a predetermined current pulse ON time and a predetermined current pulse are determined according to work conditions. The workpiece is processed by selecting the OFF time.

  When the wire electrode is short-circuited during electric discharge machining, the wire electric discharge machine described in Patent Document 1 moves the wire along a preset moving direction, and then returns to the short-circuited position before discharging. Processing was resumed.

JP 05-77109 A

  However, the wire electric discharge machine has problems in that the movement control of the wire is complicated and the predetermined current pulse OFF time cannot be automatically changed.

  In view of the above circumstances, an object of the present invention is to provide a wire electric discharge machine capable of automatically changing a predetermined current pulse OFF time and quickly releasing a short-circuit state.

In the device according to claim 1, a wire electrode for processing a workpiece by discharge energy of a processing power source;
A moving means disposed on the bed for moving the workpiece relative to the wire electrode;
A table disposed on the moving means and to which the workpiece is attached;
A detector that detects that a short circuit has occurred between the wire electrode and the workpiece during electrical discharge machining;
A control device for controlling the processing;
A wire electric discharge machine having
The control device includes:
A storage unit for storing the current pulse ON time and the current pulse OFF time of the machining power supply;
Control processing of the workpiece based on the predetermined current pulse ON time and the predetermined current pulse OFF time,
When the detection unit detects that a short circuit has occurred between the wire electrode and the workpiece, the moving unit is stopped, and the current pulse OFF time is changed from the predetermined current pulse OFF time. change.

  According to this, since the moving means is stopped and the predetermined current pulse OFF time can be automatically changed, the short-circuit state can be quickly released without moving either the wire electrode or the workpiece. Can do.

In addition, the control device
When the detection unit detects that a short circuit has occurred between the wire electrode and the workpiece,
Control is performed so that the time of the current pulse OFF time becomes longer corresponding to the elapsed time from the start of the current pulse ON.

  According to this, the moving means is stopped, and the current pulse OFF time is controlled so as to be longer corresponding to the elapsed time from the start of the current pulse ON, so that the machining scrap elimination time and the cooling between the poles Since time can be secured, this contributes to the quick release of the short-circuit state.

  The detection unit can detect that a short circuit has occurred between the wire electrode and the workpiece every 1 microsecond.

  According to this, an early grasp and correction of abnormality can be realized.

  Further, the workpiece is processed at a plurality of different positions in the feeding direction of the wire electrode.

  According to this, work efficiency can be improved.

It is a schematic block diagram of the wire electric discharge machine of one Embodiment in this invention. It is a control block diagram of the embodiment. It is a schematic explanatory drawing of the memory | storage part of the control apparatus of the embodiment. It is explanatory drawing of the setting of the current pulse ON time and the predetermined current pulse OFF time. It is explanatory drawing of control at the time of normal time and a short circuit occurrence.

  A wire electric discharge machine according to a first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the wire electric discharge machine 10 includes a bed 20 as a basic portion of the apparatus, and a cross table as a moving unit that is disposed on the bed 20 and moves the workpiece W relative to the wire electrode E 30, a table 40 provided with an insulator 41 on the cross table 30, a column 50 extending upward from the bed 20, and an arm portion 60 extending from the column 50 toward the table 40, A machining power source 80, a drive power source 90, and a control device 100 that controls machining are provided.

The cross table 30 is supported on the upper surface on the right side of the paper surface of the bed 20 in FIG. 1, and moves in the horizontal plane before and behind the paper surface of FIG. An X-axis table 32 that can be changed, and the position of the workpiece W can be changed by driving the cross-table drive motor 33 and the cross-table drive motor 34.
A processing tank (not shown) is disposed above the cross table 30, and a table 40 is disposed in the processing tank. The machining tank is provided with a machining liquid tank (not shown) so that the machining liquid can be supplied to the machining area during electric discharge machining.

  The column 50 extends upward from the upper surface of the bed 20.

  The arm unit 60 includes a lower arm unit 61 and an upper arm unit 62.

  The lower arm portion 61 extends from the column 50 to the right side in FIG. 1 and is disposed below the workpiece W.

  The upper arm portion 62 extends from the column 50 to the right side in FIG. 1 and is disposed above the workpiece W.

  A wire made of molybdenum is used for the wire electrode E, and a constant tension is applied from the wire drum 70 by the non-energizing wheel 71 and the energizing wheel 72 to return to the wire drum 70 again, and is arranged in an annular shape. The wire electrode E is rotated by the drive of the wire drum drive motor 73.

  A plurality of non-energizing wheels 71 are arranged on the column 50 and the lower arm part 61, and three energizing wheels 72 are arranged on the upper arm part 62.

  In this embodiment, the energization block 74 is disposed at three locations on the lower arm, and a portion between the upper and lower energization wheels 72 and the energization block 74 serves as a machining portion that discharges the workpiece W. And the process part is distribute | arranged in order of the 1st process part 11, the 2nd process part 12, and the 3rd process part 13 from the right in FIG.

  The machining power supply 80 that supplies power to the wire electrode E includes a first power supply 81 that supplies power to the first machining unit 11, a second power supply 82 that supplies power to the second machining unit 12, and the third machining unit 13. And a third power source 83 for supplying power to the power source.

  One energization wheel 72 is connected from each of the first power supply 81, the second power supply 82, and the third power supply 83, and an energization block 74 corresponding to each energization wheel 72, the first power supply 81, the second power supply 82, and the third power supply. 83 are connected to each other.

  The machining power supply 80 has a detection unit 84 that detects that a short circuit has occurred between the wire electrode E and the workpiece W during electric discharge machining. The detection unit 84 includes a voltmeter that measures a machining voltage and an ammeter that measures a machining current. In the present embodiment, the detection unit 84 can detect a current pulse every 1 microsecond (μS). The machining power source 80 and the workpiece W are grounded.

  The drive power supply 90 is connected to the cross table drive motor 33, the cross table drive motor 34, and the wire drum drive motor 73, and can supply power.

  As shown in FIGS. 1 and 2, the control device 100 is connected to a driving power source 90 that drives the cross table 30 and the wire drum 70 and a machining power source 80, and can control the driving power source 90 and the machining power source 80. Yes.

  The control device 100 includes a control unit 101, a storage unit 102, an input unit, a display unit, and the like (not shown).

  The control unit 101 includes an arithmetic processing device having a CPU, ROM, RAM, other peripheral circuits, and the like.

  As shown in FIGS. 1 and 2, the control unit 101 acquires data necessary for processing the workpiece W based on the measurement value, and further creates a processing program based on the acquired data. Further, the cross table drive motor 33, the cross table drive motor 34, the wire drum drive motor 73, the drive power source 90, and the machining power source 80 are controlled.

  In the storage unit 102, machining conditions, machining models, machining programs, machining time data, in particular, as shown in FIG. 3, current pulse ON time and current pulse OFF time of the machining power source 80 are stored. (In FIG. 3, they are expressed as pulse ON and pulse OFF).

  The storage unit 102 stores information obtained by previously analyzing and processing current pulse OFF time data after a short circuit in AI (population intelligence), which is used to automatically correct the current pulse OFF time.

  Next, a processing method using the wire electric discharge machine 10 will be described.

  A workpiece W is attached to each table 40 using a clamp or the like, and is held. In the wire electric discharge machine 10, the workpiece W is moved by the cross table 30 to the first processed part 11, the second processed part 12, and the third processed part 13 of the wire electrode E arranged along the vertical direction. The attached table 40 is moved, and electric power is supplied from the machining power source 80 to the wire electrode E to perform electric discharge machining.

  In the present embodiment, as shown in FIG. 4, the current pulse ON time is 20 microseconds (μS), and the current pulse OFF time is 100 microseconds (μS) (in FIG. 4, they are expressed as pulse ON and pulse OFF). ing).

  At this time, the detection unit 84 detects a current every 1 microsecond (μS). When the detection unit 84 detects that a short circuit has occurred between the wire electrode E and the workpiece W in at least one of the first processing unit 11, the second processing unit 12, and the third processing unit 13. The wire electric discharge machine 10 stops the cross table 30 and changes the current pulse OFF time from the predetermined current pulse OFF time of 100 microseconds (μS) to 130 microseconds (μS).

  In addition, the control unit 101 performs control so that the time of the current pulse OFF time becomes longer corresponding to the elapsed time from the start of the current pulse ON. For example, as shown at the time of occurrence of a short circuit in FIG. 5, if the occurrence of a short circuit is 9 microseconds (μS) from the start of current pulse ON, then 130 microseconds (μS), and 13 microseconds (μS) from the start of current pulse ON. If so, control is performed such that 140 microseconds (μS).

  With the above control, the removal time of the machining waste and the cooling time between the poles are secured, and the current pulse ON time is restored to 20 microseconds (μS) and the current pulse OFF time is restored to 100 microseconds (μS). The short circuit between the wire electrode E and the workpiece W is released, and the electric discharge machining of the workpiece W is resumed.

  After that, if it is detected that a short circuit has occurred between the wire electrode E and the workpiece W, the above control is performed, and the workpiece W is melted and removed according to the program to complete the electric discharge machining.

In the wire electric discharge machine 10 described above, the wire electrode E that processes the workpiece W by the discharge energy of the machining power source 80,
A cross table 30 disposed on the bed 20 as a moving means for moving the workpiece W relative to the wire electrode E;
A table 40 disposed on the cross table 30 to which the workpiece W is attached;
A detector 84 for detecting that a short circuit has occurred between the wire electrode E and the workpiece W during electric discharge machining;
A control device 100 for controlling processing;
A wire electric discharge machine having
The control device 100
A processing unit 80 includes a storage unit 102 that stores current pulse ON time and current pulse OFF time.
Control processing of the workpiece W based on the predetermined current pulse ON time and the predetermined current pulse OFF time,
When the detection unit 84 detects that a short circuit has occurred between the wire electrode E and the work W, the cross table 30 is stopped and the current pulse OFF time is changed from the predetermined current pulse OFF time. .

  According to this, since the cross table 30 as the moving means is stopped and the predetermined current pulse OFF time can be automatically changed, a short circuit is made without moving either the wire electrode E or the workpiece W. The state can be released promptly.

In addition, the control device 100
When the detection unit 84 detects that a short circuit has occurred between the wire electrode E and the workpiece W,
Control is performed so that the time of the current pulse OFF time becomes longer corresponding to the elapsed time from the start of the current pulse ON.

  According to this, since the cross table 30 is stopped and the current pulse OFF time is controlled so as to be longer in accordance with the elapsed time from the start of the current pulse ON, the machining scrap elimination time, Since cooling time can be ensured, it contributes to being able to cancel | release a short circuit state rapidly.

  Further, the detection unit 84 can detect that a short circuit has occurred between the wire electrode E and the workpiece W every 1 microsecond (μS).

  According to this, an early grasp and correction of abnormality can be realized.

  In addition, the workpiece W is processed at a plurality of different positions (first processed portion 11, second processed portion 12, third processed portion 13) in the feeding direction of the wire electrode E.

  According to this, work efficiency can be improved.

  The wire electric discharge machine 10 of the present invention is not limited to the above configuration. That is, various design changes can be made without departing from the gist of the present invention.

  For example, although the wire electrode E uses molybdenum, a conductive material such as brass, copper, tungsten, or the like can be used.

  Moreover, although the process part was comprised by the 1st process part 11, the 2nd process part 12, and the 3rd process part 13, it is also possible to comprise a process part by numbers other than three.

  If the detection unit 84 detects that a short circuit has occurred between the wire electrode E and the workpiece W, the current pulse OFF time may be shortened if the short circuit state can be quickly released. It is also possible to control it.

  The energization block 74 is used when processing an iron-based workpiece. However, when processing aluminum, the energization block 74 is formed because an aluminum coating is formed on the energization block 74 to inhibit discharge. It is also possible to remove and perform electric discharge machining only with the energizing wheel 72.

DESCRIPTION OF SYMBOLS 10 Wire electric discharge machine 11 1st process part 12 2nd process part 13 3rd process part 20 Bed 30 Cross table 40 Table 80 Process power supply 84 Detection part 100 Control apparatus 102 Memory | storage part E Wire electrode W Workpiece

Claims (4)

A wire electrode for processing the workpiece by the discharge energy of the processing power source;
A moving means disposed on the bed for moving the workpiece relative to the wire electrode;
A table disposed on the moving means and to which the workpiece is attached;
A detector that detects that a short circuit has occurred between the wire electrode and the workpiece during electrical discharge machining;
A control device for controlling the processing;
A wire electric discharge machine having
The control device includes:
A storage unit for storing the current pulse ON time and the current pulse OFF time of the machining power supply;
Control processing of the workpiece based on the predetermined current pulse ON time and the predetermined current pulse OFF time,
When the detection unit detects that a short circuit has occurred between the wire electrode and the workpiece, the moving unit is stopped, and the current pulse OFF time is changed from the predetermined current pulse OFF time. A wire electric discharge machine characterized by changing. The control device includes:
When the detection unit detects that a short circuit has occurred between the wire electrode and the workpiece,
2. The wire electric discharge machine according to claim 1, wherein the current pulse OFF time is controlled to become longer corresponding to the elapsed time from the start of the current pulse ON.   The wire electric discharge machining according to claim 1, wherein the detection unit is capable of detecting that a short circuit has occurred between the wire electrode and the workpiece every 1 microsecond. Machine. The wire electric discharge machine according to claim 1, 2 or 3, wherein the workpiece is processed at a plurality of different positions in the feeding direction of the wire electrode.

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