JPWO2015125258A1 - Wire electrical discharge machine - Google Patents

Abstract

In order to pass an extremely fine wire electrode through the upper wire electrode guide part, in the present invention, an upper supply electron that contacts the wire electrode and supplies a current to the wire electrode, an upper guide disposed above the upper supply electrode, and An upper guide comprising a lower guide disposed on the lower side for guiding the wire electrode so as to contact the upper power supply, an upper machining liquid nozzle for spraying a machining liquid onto a workpiece during electric discharge machining, and the upper part An upper wire electrode guide part having an upper die for positioning a wire electrode during electric discharge machining arranged at a jet port of a machining liquid nozzle, and a wire electric discharge machining apparatus comprising: a lower guide of the upper wire electrode guide part; It was set as the structure which provided the suction device which attracts | sucks air from the lower side.

Description

  The present invention relates to a wire electric discharge machining apparatus, and more particularly to wire electrode connection.

  In general, in a wire electric discharge machining apparatus, a wire electrode having a diameter φ = 0.3 mm to 0.1 mm is used, and the tip of the wire electrode cut after the previous electric discharge machining by the wire electrode automatic connection mechanism is an upper wire electrode. It is automatically sent to the wire electrode recovery section through the guide section, workpiece starting hole, lower wire electrode guide section, and lower wire electrode feed section, and the wire electrode is connected for the next electric discharge machining. Is called.

  Conventionally, in a wire electrical discharge machining apparatus with automatic connection that processes a workpiece by applying a machining discharge pulse to an electric discharge machining gap between the wire electrode and the workpiece, an internal nozzle in the nozzle that guides the wire electrode during automatic connection An automatic connection method in a wire electric discharge machining apparatus that automatically removes a machining fluid and makes a wire inside a nozzle in a dry state is disclosed (for example, see Patent Document 1).

JP-A-2-48119

  When the wire electrode has a diameter of φ = 0.05 mm or less and cannot be straightened by annealing, the air blown from the upper guide pipe rebounds at the pipe outlet, and the inside of the upper guide pipe The problem is that air convection prevents the fine wire electrode from being transported, and the wire electrode cannot pass through the upper wire electrode guide due to the wire electrode protruding outside the transport path, thus failing in automatic connection. There is.

  In the conventional technique described in Patent Document 1, the diameter of the cut end portion of the wire electrode cut by heat or a cutter below the upper wire electrode guide portion is not larger than the diameter of the wire electrode. The nozzle and the wire electrode are cut in a dry state to obtain a good cut end shape, and the cut end portion easily passes through the lower wire electrode guide portion. It does not pass through electrodes.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the wire electric discharge machining apparatus which can let an ultrafine wire electrode pass to an upper wire electrode guide part.

  In order to solve the above-described problems and achieve the object, the present invention provides a feed roller that feeds a wire electrode, an upper guide pipe that guides the wire electrode downward, and air is sent downward into the upper guide pipe. An upper wire electrode feed section having a guide pipe head, an upper supply electron that contacts the wire electrode and supplies a current to the wire electrode, an upper guide disposed on the upper side of the upper supply electron, and a lower side An upper guide comprising a lower guide disposed so as to guide the wire electrode so as to contact the upper power supply, an upper machining liquid nozzle for spraying a machining liquid onto a workpiece during electric discharge machining, and the upper machining liquid nozzle In the wire electric discharge machining apparatus comprising: an upper wire electrode guide portion having an upper die that is positioned at a jet nozzle of the wire and that positions the wire electrode during electric discharge machining. Characterized in that a suction device which sucks air from the lower side of the lower guide of the ear electrode guide part.

  The wire electric discharge machining apparatus according to the present invention has an effect that an extremely fine wire electrode can be passed through the upper wire electrode guide portion.

FIG. 1 is a schematic diagram showing a wire electrode traveling system of an embodiment of a wire electric discharge machining apparatus according to the present invention. FIG. 2 is a longitudinal sectional view of the upper wire electrode guide portion of the embodiment. FIG. 3 is an enlarged vertical cross-sectional view of the upper wire electrode guide portion of the embodiment in a phase different from that of FIG. FIG. 4 is a cross-sectional view showing the lower wire electrode guide portion and the lower wire electrode feed portion of the embodiment. FIG. 5 is a wire electrode feed time chart of the upper wire electrode guide portion of the embodiment.

  Embodiments of a wire electric discharge machining apparatus according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a schematic view showing a wire electrode traveling system of an embodiment of a wire electric discharge machining apparatus according to the present invention, and FIG. 2 is a longitudinal sectional view of an upper wire electrode guide portion of the embodiment. FIG. 3 is an enlarged vertical sectional view of the upper wire electrode guide portion of the embodiment different from that of FIG. 2, and FIG. 4 shows the lower wire electrode guide portion and the lower wire electrode feed portion of the embodiment. FIG. 5 is a cross-sectional view, and FIG. 5 is a wire electrode feed time chart of the upper wire electrode guide portion of the embodiment.

  As shown in FIG. 1, the wire electric discharge machining apparatus 100 of the embodiment includes a wire electrode holding unit 10, an upper wire electrode feeding unit 30, an upper wire electrode guide unit 40, a lower wire electrode guide unit 60, and a lower part. A wire electrode feed unit 70 and a wire electrode recovery unit 80 are provided.

  The wire electrode holding unit 10 includes a bobbin 11 that winds and holds the wire electrode 1 and pulleys 12a, 12b, and 12c that change the feeding direction of the wire electrode 1.

  The upper wire electrode feeding section 30 guides the wire electrode 1 to the lower upper wire electrode guide section 40, the feed roller 21 that feeds the wire electrode 1, pinch rollers 22 a and 22 b that wind the wire electrode 1 around the feed roller 21, and the wire electrode 1. An upper guide pipe 31 and a guide pipe head 32 for sending air downward into the upper guide pipe 31 are provided.

  As shown in FIG. 1 and FIG. 2, the upper wire electrode guide part 40 is in contact with the wire electrode 1 and supplies an electric current to the wire electrode 1, and an upper side disposed above the upper supply electron 42. The upper guide 44, which is composed of a guide 44a and a lower guide 44b arranged on the lower side, guides the wire electrode 1 so as to contact the upper power supply 42, and is arranged on the upper side of the upper guide 44a, and the lower end of the upper guide pipe 31. The wire track 49 into which the portion is inserted and the lower guide 44b are disposed below, and the wire electrode 1 is sent downward and the tip thereof is sent to the lower wire electrode guide portion 60 through the processing start hole of the workpiece 51. A jet nozzle 45 that ejects the liquid, an upper machining liquid nozzle 46 that is disposed below the jet nozzle 45 and sprays the machining liquid onto the workpiece 51 during electric discharge machining, Disposed spout parts machining liquid nozzle 46, an upper die 43 for positioning the wire electrode 1 during the discharge machining, and a upper guide block 41 for holding them, the.

  Although not shown, a cutter or a cutting unit that cuts the wire electrode 1 with Joule heat due to electric current is disposed above the upper wire electrode guide portion 40. The cutting unit is movable in the lateral direction. When cutting the wire electrode 1, the upper guide pipe 31 is raised to create a gap between the lower end of the upper guide pipe 31 and the wire track 49, and the cutting unit is moved into the gap to cut the wire electrode 1. To do. After cutting, the cutting unit is moved laterally, the upper guide pipe 31 is lowered, and the lower end portion is inserted into the wire track 49.

  As shown in FIGS. 1 and 4, the lower wire electrode guide part 60 is disposed below the upper wire electrode guide part 40, and a lower machining liquid nozzle 66 that sprays a machining liquid onto the workpiece 51 during electric discharge machining, A lower die 63 disposed in the lower machining liquid nozzle 66 for positioning the wire electrode 1 during electric discharge machining, and a lower portion disposed below the lower die 63 for contacting the wire electrode 1 and supplying current to the wire electrode 1 The lower guide 64 includes a power supply 62, an upper guide 64 b disposed on the upper side of the lower power supply 62, and a lower guide 64 a disposed on the lower side, and guides the wire electrode 1 so as to contact the lower power supply 62. And a lower guide block 61 for holding them.

  As shown in FIG. 1 and FIG. 4, the lower wire electrode feeding section 70 has a lower roller 72 that changes the feeding direction of the wire electrode 1 and a negative pressure for feeding the wire electrode 1 from the lower die 63 to the lower guide 64. An aspirator 73 that ejects a machining fluid that is generated and sends the wire electrode 1 to the wire electrode collection unit 80, a lower guide pipe 74 that guides the wire electrode 1 to the wire electrode collection unit 80, and a lower roller block 71 that holds them. And have.

  As shown in FIG. 1, the wire electrode collection unit 80 includes wire collection rollers 81 a and 81 b that hold and pull the wire electrode 1, and a pipe end 82 that separates the wire electrode 1 and the processing liquid.

  The wire electric discharge machining apparatus 100 according to the embodiment generates a discharge by applying a pulse voltage between the wire electrode 1 and the workpiece 51 while running the wire electrode 1 in the wire electrode running system. The upper wire electrode guide part 40 and the lower wire electrode guide part 60 are moved relative to each other in a sawtooth shape to process the workpiece 51 into a desired shape.

  Next, a characteristic configuration of the wire electric discharge machining apparatus 100 according to the embodiment will be described with reference to FIGS. 2, 3, and 5. As shown in FIG. 3, the upper guide block 41 of the upper wire electrode guide part 40 is formed with a suction passage 41a communicating with the lower side of the lower guide 44b. A suction device 48 is connected to the suction passage 41a. The suction device 48 sucks air in the wire electrode passage.

  As shown in FIG. 2, the upper guide block 41 of the upper wire electrode guide section 40 is provided with a nozzle passage 98 connected to the jet nozzle 45, and the nozzle passage 98 is connected to the jet nozzle via a switching valve 97. A liquid pump 96 for ejecting the machining fluid from 45 is connected. The liquid pump 96 sucks the processing liquid from the processing liquid tank 99. Further, a suction device 95 that sucks air in the wire electrode passage from the lower side of the upper die 43 is connected to the nozzle passage 98 via a switching valve 97. Note that the suction device 95 may be connected to the suction passage 41a shown in FIG. 3 via a switching valve, and may be used for both the suction of the suction passage 41a and the suction of the nozzle passage 98.

  A sub guide 47a is disposed between the upper guide 44a and the upper power supply 42 as a member that fills the gap between the upper guide 44a and the upper power supply 42. Between the lower guide 44b and the upper die 43, an adapter 47b is disposed as a member that fills the gap between them. Since the member for filling the gap is arranged, when the air in the wire electrode passage is sucked by the suction devices 48 and 95, the air outside the passage is sucked and the suction efficiency is not lowered.

  The suction devices 48 and 95, the liquid pump 96, the switching valve 97, a pulse motor (not shown) that rotates the feed roller 21, and an air pump (not shown) that sends air to the guide pipe head 32 are controlled by the NC device 90 of the wire electric discharge machining apparatus 100. The

  As shown in FIG. 5, when the NC device 90 issues a connection command, the control unit 92 includes a pulse motor (not shown) that rotates the feed roller 21, an air pump (not shown) that sends air to the guide pipe head 32, and an aspirator 48. Start. The tip of the wire electrode 1 located at the lower part of the upper guide pipe 31 at the start of connection is sent to the feed roller 21 (feed speed at the time of connection: 5000 mm / min) and approaches the upper guide 44a.

  At this time, since the air flow rate supplied from the guide pipe head 32 and the air flow rate sucked by the suction device 48 are balanced, the air blown out from the upper guide pipe 31 rebounds at the pipe outlet (that is, the upper guide 44a). No, air does not convect in the upper guide pipe 31 to prevent the wire electrode 1 from being fed, and the tip of the wire electrode 1 passes through the upper guide 44a.

  The determination unit 91 determines the position of the tip end portion of the wire electrode 1 from the rotation amount (wire electrode feed amount) of the feed roller 21, and instructs the control unit 92 when the tip end portion of the wire electrode 1 reaches the upper guide 44a. Then, the suction of the suction device 48 is stopped, the suction by the suction device 95 is started, and the air in the wire electrode passage is sucked from the lower side of the upper die 43. At this time, the rotation of the feed roller 21 is slowed or stopped.

  After a lapse of a certain time from the start (start) of suction by the suction device 95, the suction by the suction device 95 is stopped, the switching valve 97 is switched, the liquid pump 96 is connected to the nozzle passage 98, and the processing liquid to the nozzle passage 98 is supplied. While starting supply, the feed roller 21 is rotated and the wire electrode 1 is sent out. The liquid pump 96 sucks the processing liquid from the processing liquid tank 99. The machining liquid ejected from the jet nozzle 45 is ejected downward from the upper machining liquid nozzle 46, sucks the wire electrode 1 and sends it downward, and the lower end of the wire electrode guide passes through the machining start hole of the workpiece 51. Send to part 60.

  When the tip of the wire electrode 1 reaches the position of the lower power supply 62 of the lower wire electrode guide 60, a sensor (not shown) detects this and sends a detection signal to the determination unit 91 of the NC device 90. The determination unit 91 determines the position of the tip of the wire electrode 1 and instructs the control unit 92 to stop the supply of the processing liquid to the jet nozzle 45 by the liquid pump 96.

  When the distal end portion of the wire electrode 1 passes through the lower wire electrode guide portion 60, the lower wire electrode feed portion 70, and the wire electrode recovery portion 80 and is held by the wire recovery rollers 81a and 81b, the wire recovery rollers 81a and 81b Since the wire electrode feed speed is faster than the feed speed of the feed roller 21, the feed roller 21 is pulled to increase the rotational speed. The determination unit 91 of the NC device 90 determines this and issues a carry-out completion command. After a certain amount of play time has elapsed, the connection command and the carry-out completion command are canceled, and a series of automatic wire connection work for the wire electrode 1 is completed.

  According to the wire electric discharge machining apparatus 100 of the embodiment described above, the upper wire electrode guide portion 40 is provided with the suction device 48 for sucking air from the lower side of the lower guide 44b of the upper wire electrode guide portion 40. A very fine wire electrode 1 can be passed through.

  DESCRIPTION OF SYMBOLS 1 Wire electrode, 10 Wire electrode holding | maintenance part, 11 Bobbin, 12a, 12b, 12c Pulley, 21 Feed roller, 22a, 22b Pinch roller, 30 Upper wire electrode feed part, 31 Upper guide pipe, 32 Guide pipe head, 40 Upper wire Electrode guide part, 41 Upper guide block, 41a Suction passage, 42 Upper supply electron, 43 Upper die, 44 Upper guide, 44a Upper guide, 44b Lower guide, 45 Jet nozzle, 46 Upper machining liquid nozzle, 47a Sub guide, 47b Adapter, 48 Aspirator, 49 Wire track, 51 Workpiece, 60 Lower wire electrode guide, 61 Lower guide block, 62 Lower power supply, 63 Lower die, 64 Lower guide, 64a Lower guide, 64b Upper guide, 70 Lower wire electrode feed , 71 Lower roller block, 72 Lower roller, 73 Aspirator, 74 Lower guide pipe, 80 Wire electrode collection unit, 81a, 81b Wire collection roller, 82 Pipe end, 90 NC device, 91 Judgment unit, 92 Control unit, 95 Suction Device, 96 liquid pump, 97 switching valve, 98 nozzle passage, 99 working fluid tank, 100 wire electric discharge machining device.

In order to solve the above-described problems and achieve the object, the present invention provides a feed roller that feeds a wire electrode, an upper guide pipe that guides the wire electrode downward, and air is sent downward into the upper guide pipe. An upper wire electrode feed section having a guide pipe head, an upper supply electron that contacts the wire electrode and supplies a current to the wire electrode, an upper guide disposed on the upper side of the upper supply electron, and a lower side An upper guide comprising a lower guide disposed so as to guide the wire electrode so as to contact the upper power supply, an upper machining liquid nozzle for spraying a machining liquid onto a workpiece during electric discharge machining, and the upper machining liquid nozzle It arranged jets, comprising an upper wire electrode guide portion having an upper die for positioning the wire electrode during electric discharge machining, and the said wire electrode upper guide, the upper Feeder, the wire electric discharge machining apparatus for passing a wire electrode path formed by the lower guide and the upper die, the sucking the air of the upper wire electrode guide portion lower guide in the wire electrode passage from the lower side of the 1 suction device is provided.

Claims (5)

An upper wire electrode feed section having a feed roller for feeding the wire electrode, an upper guide pipe for guiding the wire electrode downward, and a guide pipe head for sending air downward into the upper guide pipe;
An upper supply electron that contacts the wire electrode and supplies current to the wire electrode, an upper guide disposed above the upper supply electron, and a lower guide disposed below the upper supply electron, Positions the upper guide that guides it in contact with the power supply, the upper machining fluid nozzle that sprays the machining fluid onto the workpiece during electrical discharge machining, and the wire electrode that is placed at the jet port of the upper machining fluid nozzle and is undergoing electrical discharge machining. An upper die that has an upper die, and an upper wire electrode guide portion having
In a wire electric discharge machining apparatus comprising:
A wire electric discharge machining apparatus comprising a suction device for sucking air from a lower side of the lower guide of the upper wire electrode guide part.   The wire electric discharge machining apparatus according to claim 1, further comprising a suction unit that sucks air from a lower side of the upper die of the upper wire electrode guide part.   The upper wire electrode guide portion includes a jet nozzle that is disposed below the lower guide and ejects a processing liquid for sending the wire electrode downward, and the suction device is connected to a pipe connected to the jet nozzle. The wire electrical discharge machining apparatus according to claim 2, wherein air is sucked from the lower side of the upper die through the pipe.   The wire electric discharge machining apparatus according to claim 2, wherein a member that fills a gap is disposed between the upper guide and the upper power supply and between the lower guide and the upper die. Based on the wire electrode feed amount of the feed roller, a determination unit that determines that the tip of the wire electrode has reached the lower guide of the upper wire electrode guide unit;
Based on the determination of the determination unit, the suction of the suction device that sucks air from the lower side of the lower guide of the upper wire electrode guide unit is stopped, and the air is sucked from the lower side of the upper die of the upper wire electrode guide unit. A control unit for starting suction of the suction device
A wire electric discharge machining apparatus comprising an NC apparatus having

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