JP2008012643A - Wire cut electric discharge machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire cut electric discharge machining device capable of more surely inserting a wire electrode into a pilot hole without being hooked by a peripheral member, and without being twisted and slackened in an automatic wire connection device which slackens the wire electrode, by flying and discharging the slackened wire electrode with the jet force at a stroke. <P>SOLUTION: The wire electrode 2 is slackened between an auxiliary roller 1 and an introduction block 3 having a wire electrode introduction inlet 5 of a guide pipe 4. A strip-shaped plate 6 is provided with a hole 7 for passing through the wire electrode 2 at one end. The strip-shaped plate 6 is fixed to the introduction block 3 at the other end in an arc shaped bent state. The strip-shaped plate 6 has a spring force weaker than the force when the wire electrode 2 receives an impelling force. The strip-shaped plate 6 slackens the wire electrode 2 between the auxiliary roller 1 and the introduction block 3 in one direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire-cut electric discharge machining apparatus provided with an automatic wire connection device in which a wire electrode is passed through a pilot hole by a method in which the wire electrode is loosened and the loosened wire electrode is blown at a stroke by a jet and sent out. . In particular, the present invention relates to a wire-cut electric discharge machining apparatus provided with an automatic connection device provided with a forced relaxation means for loosening a wire electrode in a predetermined direction.

  2. Description of the Related Art There is known a wire-cut electric discharge machining apparatus equipped with an automatic wire connection device for inserting a wire electrode into a pilot hole and stretching the wire electrode. The automatic wire connection device cuts and discards the tip portion of the wire electrode, sends out a new wire electrode to the pilot hole and inserts it, passes through the lower wire guide, and connects to the take-up roller. In such an automatic connection device, as a method for performing automatic connection, there is a method in which a wire electrode is loosened and the loosened wire electrode is sent out at a stroke by the force of a jet (see Patent Document 1).

  In the method in which the wire electrode is blown and sent at a stroke by the momentum of the jet, the guide pipe is lowered, and the wire electrode is loosened between the feed roller and the introduction block having the wire introduction port of the guide pipe. Thereafter, the clamping device that clamps the wire electrode is opened to release the restraint of the wire electrode, and the wire electrode is passed through the pilot hole by the propulsive force of the jet. This method has an advantage that the time required for automatic connection is short. Moreover, there is an advantage that the probability of successful automatic connection is high even when the diameter of the pilot hole is smaller than the diameter of the wire electrode (see Patent Document 2).

Japanese Patent Publication No. 8-22484 JP 2002-126951 A

  In the automatic connection method described above, the direction in which the wire electrode slacks is not always constant, and the peripheral member may slack in the direction of the peripheral member, so the slackened wire electrode is caught or entangled with the peripheral member. It may become impossible.

  In addition, the wire electrode may slack so that it twists. If the wire electrode slacks so that it twists, the behavior of the wire electrode becomes oscillating when the wire electrode is carried on a jet. The possibility of buckling.

  The present invention relates to an automatic connection device of a type in which a wire electrode is loosened, and the loosened wire electrode is blown at a stroke by a jet to send out the wire electrode without being caught by a peripheral member or twisted and loosened. An object of the present invention is to provide a wire-cut electric discharge machining apparatus that can more reliably insert a wire electrode into a pilot hole.

  The wire-cut electric discharge machining apparatus of the present invention feeds a wire electrode, loosens it between a roller and an introduction block having a wire electrode introduction port of a guide pipe, and sends the loosened wire electrode at a stroke by a jet. In a wire cut electric discharge machining apparatus equipped with an automatic connection device that allows a wire electrode to be inserted into a pilot hole by a method, a hole through which the wire electrode passes is provided at one end between the feed roller and the guide pipe. And an automatic connection device provided with a belt-like plate having a spring force weaker than a force when the other end is fixed to the introduction block in a bent state and the wire electrode receives a jet propulsion force.

  When the wire electrode is slackened, the strip is always moved in one direction by a weak spring force, so that the wire electrode is guided to slack in that direction. By making the wire electrode slack in one direction, the wire electrode is not caught by the peripheral member or twisted when the wire electrode is slackened. As a result, in the automatic wire connection device of the type in which the wire electrode is loosened and the loosened wire electrode is sent out at a stroke with the momentum of the jet, the automatic wire connection is less likely to be interrupted, and the working efficiency is improved.

  FIG. 1 shows an upper part of an automatic wire connection device of a wire cut electric discharge machining device of the present invention. FIG. 2 shows a state when the wire electrode is not slack in the wire cut electric discharge machining apparatus of FIG. FIG. 3 shows the overall configuration of the wire cut electric discharge machining apparatus. In FIG. 3, the strip plate is not shown.

  The automatic wire connection device shown in FIG. 1 is an automatic wire connection device in which a wire electrode is slackened, and the slackened wire electrode is sent out at a stretch by the force of a jet.

  The auxiliary roller 1 sandwiches and holds the wire electrode 2 and can feed or wind the wire electrode 2. 3 is an introduction block. The introduction block 3 has a wire electrode introduction port 5 for the guide pipe 4.

  The guide pipe 4 descends at least to the wire guide assembly 8 and guides the wire electrode 2. A jet is supplied into the guide pipe 4 from a jet supply port (not shown). For example, when an aqueous machining fluid is used as the electric discharge machining fluid, the jet is an aqueous machining fluid.

  The belt-like plate 6 is provided between the feed roller and the guide pipe 4. In the embodiment, the belt-like plate 6 is provided between the auxiliary roller 1 and the guide pipe 4. A through hole 7 through which the wire electrode 2 is passed is provided at one end of the belt-like plate 6. The wire electrode 2 is passed through the through hole 7 of the strip plate 6 in advance. The other end of the belt-like plate 6 is fixed to the introduction block 3 in a state of being bent in an arc shape. The belt-like plate 6 is made of synthetic resin, and specifically made of polypropylene having a thickness of 0.2 mm.

  The belt-like plate 6 loosens the wire electrode in one direction when the wire electrode 2 loosens between the feed roller and the introduction block 3. In the embodiment, the belt-like plate 6 loosens the wire electrode 2 in one direction when the wire electrode 2 is loosened between the auxiliary roller 1 and the introduction block 3. Therefore, when the wire electrode 2 is slack, the wire electrode 2 is not caught by the peripheral member, and the wire electrode 2 is not twisted.

  The belt-like plate 6 has a spring force that is weaker than the force when the wire electrode 2 passed through the through hole 7 receives the propulsive force of the jet. Therefore, it does not interfere when the wire electrode 2 is guided and propelled by the jet. Further, since the tension applied to the wire electrode 2 is larger than the force when the wire electrode 2 receives the propulsive force of the jet, the belt-like plate 6 has the wire electrode 2 passed through the through hole 7 stretched. It can be said that the spring force is weaker than the tension at the time. Therefore, as shown in FIG. 2, when the wire electrode 2 is stretched, the tension of the traveling wire electrode 2 is not affected.

  Next, the insertion connection of the wire electrode 2 will be described. The wire electrode 2 is previously passed through a hole 7 through which the wire electrode 2 is provided at one end of the belt-like plate 6. The belt-like plate 6 does not affect the tension of the traveling wire electrode 2 by a spring force weaker than the tension of the wire electrode. Therefore, during processing, the wire electrode 2 between the auxiliary roller 1 and the introduction block 3 is not loose as shown in FIG.

  When the wire electrode 2 is disconnected, the machining liquid jet supplied to the machining gap from the guide assembly 8 including the machining liquid jet nozzle is stopped. Then, the used wire electrode 2 is collected by the winding roller 9. At this time, since the remaining wire electrode 2 is free from the tip and is not given tension, the wire electrode 2 between the auxiliary roller 1 and the introduction block 3 is moved in the negative direction of the Y axis by the belt-like plate 6. Sag in one direction.

  The wire electrode 2 is wound up by a predetermined amount and clamped by the lower clamping device. Then, the tip of the wire electrode 2 is cut by the cutting device 10 while the wire electrode 2 is clamped. The tip of the wire electrode 2 cut by the cutting device 10 is collected in the collection box 11.

  Next, a jet is supplied from the jet supply device 12 into the guide pipe 4. At this time, the wire electrode 2 receives the propulsive force of the jet. Since the spring force of the belt-like plate 6 is weaker than the force when the wire electrode 2 receives the jet driving force, the belt-like plate 6 in which the wire electrode 2 is passed through the through hole 7 is pulled by the wire electrode 2 and the auxiliary roller The slack of the wire electrode 2 between 1 and the introduction block 3 is removed.

  In this state, the wire electrode 2 is clamped by the auxiliary roller 1. Further, it is clamped by the clamping device 13. When the wire electrode 2 is clamped, the wire electrode 2 between the auxiliary roller 1 and the introduction block 3 is in a state where slack is removed.

  When the guide pipe 4 is lowered while the wire electrode 2 is clamped, the introduction block 3 is moved at the same time, and the clamping device 13 is also lowered. At the same time, the auxiliary roller 1 and the feed roller 14 operate to feed the wire electrode 2 out. Therefore, the wire electrode between the auxiliary roller 1 and the introduction block 3 is kept in a state where slack is removed. The guide pipe 4 passes through the upper guide assembly 8 and descends to the front of the workpiece 15 and stops.

  When the lowering of the guide pipe 4 is stopped, the auxiliary roller 1 and the feed roller 14 feed the wire electrode 2 by a predetermined amount. The length at this time is about the length when the wire electrode 2 reaches the lower wire guide through the pilot hole. At this time, since the wire electrode 2 is clamped by the clamping device 13, the wire electrode 2 between the auxiliary roller 1 and the introduction block 3 is moved in the negative direction of the Y axis by the belt-like plate 6 as shown in FIG. Sag in one direction.

  When the clamp device 13 is opened, the clamp of the wire electrode 2 is released. The wire electrode 2 is propelled by receiving the propulsive force of the jet. At this time, since the belt-like plate 6 has a spring force that is weaker than the force when the wire electrode 2 receives the propulsive force of the jet, the slack of the wire electrode 2 between the auxiliary roller 1 and the introduction block 3 is eliminated. . Therefore, the wire electrode 2 is blown by the force of the jet and passes through the prepared hole and the lower wire guide at a stretch. When the wire electrode 2 passes, the auxiliary roller 1 is released and the feed roller 14 is rotated to send out the wire electrode 2.

  The wire-cut electric discharge machining apparatus described above can be applied to methods other than a method in which a wire electrode is placed on a jet and inserted into the pilot hole with the force of the jet. For example, when the wire electrode is buckled when the wire electrode is fed out, the wire electrode can be prevented from being caught or entangled with the peripheral member by setting the direction in which the wire electrode is slackened to one direction.

It is a perspective view which shows the automatic connection apparatus upper part of the wire cut electric discharge machining apparatus of this invention, and shows the state which the wire electrode slackened. It is a perspective view which shows the automatic connection apparatus upper part of the wire cut electric discharge machining apparatus of this invention, and shows a state when a wire electrode is not slack. It is a figure which shows the outline of the whole wire-cut electric discharge machining apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Auxiliary roller 2 Wire electrode 3 Introduction block 4 Guide pipe 5 Wire electrode introduction port 6 Strip-shaped board 7 Through hole 8 Upper guide assembly 9 Winding roller 10 Cutting device 11 Collection box 12 Jet supply device 13 Clamp device 14 Sending roller 15 Covered Workpiece

Claims (1)

A wire electrode is sent out and slackened between a roller and an introduction block having a wire electrode introduction port of a guide pipe, and the wire electrode is inserted into the pilot hole by a method in which the loosened wire electrode is blown out at a stroke by a jet force and sent out. In the wire cut electric discharge machining apparatus provided with the automatic wire connection device as described above, a through hole for passing a wire electrode is provided at one end between the feed roller and the guide pipe, and in addition to the introduction block in a state bent in an arc shape A wire-cut electric discharge machining apparatus provided with an automatic connection device provided with a belt-like plate having a spring force weaker than the force when the end is fixed and the wire electrode receives a propulsive force of a jet.

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