JPH052829U - Conductor of wire electric discharge machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The electric energy required for electric discharge machining of a wire electric discharge machine is supplied by a current-carrying method in which it slides on a wire electrode. May cause abnormal wear. In order to prevent this abnormal consumption of the conduction electrons, it was necessary to keep the contact pressure between the wire electrode and the conduction electrons constant. [Structure] The direction of the magnetic field generated when the wire electrode 1 is energized, and the direction of the magnetic field of the magnet 15 arranged in the support portion of the conducting electrons 14a are attracted to each other, and the conducting electrons 14a and the wire electrode 1 are It is configured to always maintain a constant contact pressure. [Effect] Since a stable contact pressure can be obtained during processing, it is possible to obtain an electron conduction that generates little heat in this portion and does not cause abnormal wear.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the improvement of the conduction that supplies the energy necessary for electric discharge to the wire electrode of a wire electric discharge machine.

[0002]

[Prior Art]

 Fig. 3 is an explanatory view showing an example of a conventional wire cut electric discharge machine. In the figure, 1 is a wire electrode sent from a supply bobbin 2, 3 is a direct connection to an electromagnetic brake 3a and a predetermined tension is applied to the wire electrode 1. 4a, 4b, 4c are idlers for changing the traveling direction of the wire electrode 1, 5a is the first upper guide, 5b is the second upper guide, 14a is the upper conducting wire, and 6a is the first. Lower guide, 6b is a second lower guide, and 14b is a lower electron, which are disposed inside the upper and lower working fluid jet nozzles 7 and 8, respectively. Further, 9 is a pump for supplying the working fluid 10, 11 is a pulse power supply unit for generating an electric discharge between the wire electrode 1 and the workpiece 12, and the wire electrode 1 is an upper guide 5 and a lower guide. It is supported by 6 and faces the work piece 12 in a predetermined direction. Reference numeral 13 represents a wire feed roller.

The operation of the conventional device configured as described above will be described below. First, a pulse voltage is applied between the wire electrode 1 and the workpiece 12 while ejecting the machining liquid 10 coaxially with the wire electrode 1. Then, the electric discharge is repeated in the minute gap between the wire electrode 1 and the workpiece 12 with the machining liquid 10 as the medium, and the workpiece 12 is heated by the thermal energy at the time of the discharge accompanying the vaporization and explosion of the machining liquid 10. Melt and disperse.

Further, the relative movement between the wire electrode 1 and the workpiece 12 for keeping the minute gaps facing each other constant and continuously performing the discharge is performed by a method of numerically controlling an XY cross table (not shown). It is usually done. In this way, the electric discharge is repeated and the XY table is controlled to continuously form the machining groove, and the workpiece 12 is machined into an arbitrary shape. Further, the pulse voltage is applied to the wire electrode 1 via the upper conduction electrons 14a and the lower conduction electrons 14b, and the wire electrode 1 runs while sliding on the upper conduction electrons 14a and the lower conduction electrons 14b. FIG. 4 shows a state in which the wire electrode 1 travels while sliding on the upper conduction member 14a provided between the first upper guide 5a and the second upper guide 5b. In the figure, the dimension indicated by L indicates a positional deviation, and tension is applied so that the electrical contact resistance between the wire electrode 1 and the upper conduction member 14a is minimized in the range where the wire electrode 1 is not physically damaged. It is the size. Further, the positional deviation dimension L has a relationship of P∝L, where P is the contact pressure acting between the upper conduction electrode 14a and the wire electrode 1.

[0005]

[Problems to be solved by the device]

 Since the current passing current of the conventional wire electric discharge machine is configured as described above, the sliding groove of the wire electrode 1 causes the running grooves due to wear to be formed in the upper and lower passing currents 14a and 14b. Since the size L of the displacement is reduced, the contact pressure P between the wire electrode 1 and the upper and lower conduction electrons 14a, 14b is reduced, and the electrical contact resistance between them is increased. Further, the wire electrode 1 may be separated from the conduction electrons 14a to generate a discharge, which may be consumed abnormally.

The present invention has been made to solve the above-mentioned problems, and a wire that can always maintain a constant contact pressure in order to prevent an increase in electrical contact failure due to wear of a conduction electron. The purpose is to obtain conduction of the electric discharge machine.

[0007]

[Means for Solving the Problems]

 In the wire electric discharge machine according to the present invention, a magnet is arranged behind the electron, so that the wire electrode is attracted to the electron when the wire electrode is energized.

[0008]

[Action]

 Since the current flowing through the wire electric discharge machine in this invention corresponds to the wear caused by the sliding movement of the wire electrode, the contact pressure between the wire electrode and the current flowing is always kept constant and the contact area is wide. Since heat generation in this part is small, stable power supply can be performed. Since the wire electrode is pressed against the electrons, the wire electrode and the electrons do not separate, and there is no abnormal consumption due to discharge.

[0009]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same reference numerals as those in FIGS. 3 and 4 showing the conventional example indicate the same parts, and therefore the description thereof will be omitted. In FIG. 1a, 15 is a permanent magnet, and FIG. 1b is a sectional view taken along the line AA 'in FIG. 1a, where 15a is the north pole and 15b is the south pole. The permanent magnet is arranged behind the conduction electron, and the conduction electron is connected to the pulse power supply unit 11. Further, the permanent magnet may have a structure in which the N pole and the S pole are opposed to each other on the conduction electron as shown in FIG. Further, the magnet may be a DC electromagnet capable of fixing the direction of the magnetic field.

[0010]

[Effect of the device]

 As described above, according to the present invention, the contact pressure between the conduction electrode 14a and the wire electrode 1 can be automatically obtained in association with the start of processing, and the electrical contact resistance can always be made constant. Even if the conduction electrons are exhausted, the contact pressure is automatically maintained, and the electromagnetic force (contact pressure) is strong according to the current flowing through the conduction electrons, and is attracted in the direction of arrow B. As a result, the conduction and the wire electrode do not come apart during energization, and the consumption due to discharge is eliminated and the life of conduction is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the operation of a wire electric discharge machine according to an embodiment of the present invention, illustrating the operation.

FIG. 2 is a diagram showing another embodiment of the configuration of the electromagnet showing one embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional wire electric discharge machine.

FIG. 4 is a diagram showing a conventional conduction electron.

[Explanation of symbols]

 1 Wire electrode 5 Guide 14a Conductor 15 Permanent magnet 15a N pole 15b S pole

Claims (1)

Claims for utility model registration: 1. A wire provided in a traveling path of a wire electrode, which has a conducting member for sliding the wire electrode and supplying electric energy for electric discharge machining to the wire electrode. In the electric discharge machine, the direction of the magnetic field generated when the wire electrode is energized and the direction of the magnetic field of the magnet arranged in the supporting portion of the conduction device are attracted to each other, and the conduction electron and the wire electrode are Is a structure that maintains a constant contact pressure at all times.