JPH052828U - Conductor of wire electric discharge machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To supply the electrical energy required for electric discharge machining of a wire electric discharge machine, a current-carrying method that slides on a wire electrode is used.
Abnormal consumption due to discharge may occur. This is to prevent an increase in electrical contact resistance due to wear of the conduction electrons and eliminate abnormal wear. [Structure] A structure in which the frictional force generated when the wire electrode 1 is pressed against the wire electrode and the conduction current with a constant pressure and running while sliding is automatically converted into a contact pressure, and the pressure of the working fluid used during processing. Is distributed to obtain a constant pressing force. [Effect] It becomes possible to continuously obtain a stable contact pressure, generate a small amount of heat in this portion, and obtain a conduction electron that does not cause abnormal consumption due to discharge.

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 machining apparatus. In FIG. 3, 1 is a wire electrode sent from a supply bobbin 2 and 3 is directly connected to an electromagnetic brake 3a. A brake for giving a predetermined tension to the wire electrode 1. Rollers, 4a, 4b, and 4c are idlers for changing the traveling direction of the wire electrode 1, 5a is a first upper guide, 5b is a second upper guide, 14a is an upper electron guide, and 6a is a first lower guide. , 6b is a second lower guide, and 14b is a lower electron, which is arranged inside the upper and lower working fluid jet nozzles 7, 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 6. And is opposed to 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 with the machining liquid 10 as a medium in the minute gaps between the wire electrode 1 and the workpiece 12, and the workpiece 12 is melted by the thermal energy at the time of the discharge due to the vaporization explosion of the machining liquid 10. Separate.

Further, the relative movement between the wire electrode 1 and the work piece 12 for continuously performing electric discharge while keeping the opposing minute gaps constant 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 through the upper conducting electrons 14a and the lower conducting electrons 14b, and the wire electrode 1 runs while sliding on the upper conducting electrons 14a and the lower conducting electrons 14b. .. FIG. 4 shows a state in which the wire electrode 1 travels while sliding on the upper conduction electrons 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 the tension is set so that the electrical contact resistance between the wire electrode 1 and the upper conduction member 14b is the smallest in the range in which the wire electrode 1 is not physically damaged. It is a given size. Also, the positional deviation dimension L has a relationship of P∝L, where P is the contact pressure acting between the upper conduction electrode 14 a and the wire electrode 1.

[0006]

[Problems to be solved by the device]

 Since the current-carrying current of the conventional wire electric discharge machine is configured as described above, the running groove due to wear is formed in the upper and lower current-carrying electrodes 14a, 14b due to the sliding movement of the wire electrode 1 and the position thereof. Since the size L of the shift 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, there is also a problem that the wire electrode is separated from the conduction electrons due to the vibration of the wire and a discharge is caused to cause abnormal wear.

The present invention has been made to solve the above problems, and increases the contact area for preventing an increase in electrical contact resistance due to abrasion of a conduction electron and for eliminating abnormal wear. It is an object of the present invention to obtain a conduction electron of a wire electric discharge machining device capable of holding a contact pressure by a frictional force when the wire electrode travels, or a machining fluid pressure to press a conduction electron against a wire.

[0008]

[Means for Solving the Problems]

 A plurality of current-carrying electrons of the wire electric discharge machine according to the present invention are arranged around or in the longitudinal direction of the traveling wire electrode, and the current-carrying electrons are drawn by frictional force when the wire electrode travels to obtain a contact pressure. It is a thing.

Further, the discharge pressure of the machining liquid at the time of electric discharge machining is obtained by a branch pipe to obtain a constant pressing force up to the electronic part through the pipe.

[0010]

[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. There is little heat generation in this part, and stable power supply can be performed.

Further, since the wire electrode is pressed against the electrons, no discharge occurs and no abnormal wear occurs.

[0012]

【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. 1 (a), a plurality of conducting electrons 14a are arranged around the wire electrode 1 as shown in FIG. 1 (b). Although it is three in FIG. 1B, it may be two. Then, a fulcrum 15 is provided at a part of the lower end, and the structure is such that the upper end opens with reference to this, as shown in Fig. 1 (c). It looks like Figure 1 (a).

The running direction of the wire is the direction of arrow A, and the frictional force generated during running acts in the direction (arrow B) of pulling in the electrons 14a, and as a result, the force of pushing the wire in the direction of arrow C is obtained. be able to. By arranging multiple units, it is possible to secure a large contact area in a limited space. Alternatively, they may be arranged in multiple stages in the length direction.

Example 2. Further, in order to stabilize the pressing force, there is a method of pressing the conduction from the outside with the cylinder 16 as shown in FIG. In the cylinder 16, the piston 17a is arranged in the case 17b, and the working fluid used for processing is depressurized in the direction of the arrow D to operate the piston 17a so that pressing force is obtained and pressing is exerted with the processing, and the wire electrode 1 is applied. Can supply stable power. When the wire is inserted, the spring 17c causes the piston 17a to return to its original position.

Further, as a method for obtaining the pressing force, it is also possible to dispose the wire directly in the flow path of the working fluid without using the cylinder and press the wire against the electron by the jet pressure.

[0016]

[Effect of the device]

 As described above, according to the present invention, it is possible to obtain the pressing force of the electron and the wire electrode in synchronism with the start of the processing, so that the force due to the wire running is applied or processed so that the electrical contact resistance is always constant. The pressure of the ejected machining fluid is used. As a result, there is an effect that the supply of electric energy to the wire electrode is stable, the contact area is large, the heat generation is small, and the life of the conduction electrons is long.

[Brief description of drawings]

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

FIG. 2 shows an embodiment of the present invention and is a configuration diagram when a working fluid pressure is used as a contact pressure.

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 conduction electron 15 fulcrum 16 cylinder

Claims (1)

Claims for utility model registration: 1. A wire provided in a traveling path of a wire electrode, having a conduction electron for sliding the wire electrode and supplying electric energy for electric discharge machining to the wire electrode. A feature of the electric discharge machine is that the frictional force when the wire electrode slides with the electrons is converted into the contact pressure of each other, and the contact pressure is always kept constant. Machine electronic.