JPS5856729A - Working method of wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To make smooth a wiring work of a wire electrode by inserting the work-start boring electrode through a work-start hole, then cleaning it at the time, after completing one working of a work having a plurality of work-start holes and before passing the wire electrode through the next work-start hole. CONSTITUTION:A plurality of work-start holes are made through a work 6 by means of a work-start boring electrode 21. Then a wire electrode 7 is inserted through the first work-start hole to perform the wire cut electric discharge work thus to complete the initial working. After completion of the initial working, the wire electrode 7 is cut, while a table 4 is moved to position the next work-start hole just below the electrode 21. Then the electrode 21 is lowered and inserted through the work-start hole while performing the working liquid supply and the pulse voltage application, thus to clean the interior of the work-start hole. Consequently the next inserting operation of the wire electrode can be performed reliably.

Description

[Detailed description of the invention] Inventiveness, machining method KIIL of wire-cut electric discharge machine
, time K11l! Concerning the machining method of a wire-cut electric discharge machine suitable for machining a workpiece with IN machining start holes ◎ Wire-cut electric discharge machining St is located between the upper guide and the lower guide and runs in the longitudinal direction. These wire electrodes are injected into the gap between the wire electrode and the workpiece.
A voltage is applied between the machine and the workpiece to cause a spark discharge to remove the workpiece using a WM machine.The workpiece is then machined into a desired shape by moving the workpiece holding table two-dimensionally. For example, when making a minced crab, if the wire electrode is electrically machined from the periphery of the workpiece to the starting point, the workpiece will become deformed.
In order to generate a W#RS difference, a normal wire-cut electric discharge machine processes from the machining start hole. On the other hand, if the machining shape for the hook is complex, or if the parts to be machined on one workpiece are divided into multiple groups,
Drill a machining start hole at a predetermined position on each workpiece. Once wire cut electrical discharge machining for one group is completed, the wire electrode is automatically cut, and then the cut wire electrode is placed in the next machining start hole using the built-in wire electrode automatic tensioning device. The process of inserting the wire, re-stretching the wire electrode, and restarting processing is repeated. By the way, when performing electrical discharge machining like this,
Inject machining fluid into the part where spark discharge is occurring,
The machining fluid flowing onto the workpiece surface contains many cutting chips and dust scattered in the air, and when the machining fluid flowing on the workpiece surface flows into the machining start hole with a small diameter, When machining starts due to these chips and dust, even if an attempt is made to insert the wire electrode into the machining start hole, the wire electrode will not be able to be inserted as expected due to clogging of the machining start hole. In order to improve these drawbacks, we have created a process where it is necessary to insert a wire electrode (a machining start hole is created, the wire electrode is inserted through it, electrical discharge machining is performed, and once this is completed, a fork-shaped machining start hole is drilled). Another method is possible, but if a pipe electrode is generally used as the electrode of the machining start hole drilling device, a 4p-shaped leftover part will be left behind at the bottom of the machining start hole in the final stage II of the machining start hole drilling. This part comes into contact with the pipe electrode, making it difficult to continue electrical discharge machining.Therefore, when the machining start hole drilling is completed, the remaining part must be manually removed. With such a method, complete automation of wire-cut electrical discharge machining cannot be achieved.Also, there is data showing that if a machining start hole is drilled in the workpiece each time, the wear of the pipe electrode increases. There is no way to improve the shortcomings.

Therefore, the object of the present invention is to drill several machining start holes in one workpiece VcIII, and then insert a wire electrode into one of these machining start holes before the machining step.
It is an object of the present invention to provide an electric discharge machining method that allows a wire electrode to be smoothly inserted into a machining start hole in a machining method that includes electric discharge machining.

Next, one embodiment of the present invention will be described in detail using the wJ plane.

The figure is a side view showing the gloss-cut electrical discharge machine used in the present invention. In the figure, 1 is a column installed upright on the base 2.
] Shaped and on top is a capacitor box S for power supply
is placed. A KFi on the base 2 and a workpiece mounting table 4 are installed, and the workpiece mounting table 4 is pushed onto the base 2 and is driven two-dimensionally by an X-direction drive motor and a Y-direction drive motor #. It is movable. A kukuro is attached to the top of the workpiece mount 4 by a clamp 5. 7 is a wire electrode, which runs in the direction of the arrow in the electrical discharge machining method. 8 is a feed reel around which an unused wire electrode is wound; 9 is a brake roller that applies a brake in the pulling direction of the wire electrode; 10q roller; 11 1 is a lower guide reeler, 12 is an upper guide roller, 15 is a p-ra, and 14 is a feed four-ra, which are rotated by a drive motor that drives the wire electrode.

A pinch roller 15 is pressed against the eye roller 14 by a spring 14. Note that the wire electrode 7 is sandwiched between a feed roller 14 and a pinch roller 15. 1 and 7 are take-up reels for winding up used wire electrodes. A slider 1? that is movable in two directions is provided at the tip of the column 1, and a machining start drilling member 20 is attached to the slider 1, and a pipe electrode 21 for drilling is provided at the tip of the slider 1!. It is being

To explain the process of drilling a machining start hole using the wire-cut electric discharge machine as described above, first, the wire electrode 7 is kept in a cut state. Then, the workpiece mounting table 4 is moved in the X-axis direction or the Y-axis direction to locate the planned position for drilling the machining start hole directly below the pipe electrode 21. Next, the machining start drilling member 20 is suspended in two axial directions, the tip of the pipe electrode 21 is brought very close to the surface of the workpiece 6, and while machining fluid is spouted from the tip, an electrical discharge is generated between the pipe electrode 21 and the workpiece 6. Pressure is applied to cause spark discharge between the workpiece 6 and the pipe electrode 21, thereby forming a machining start hole. Once one hole has been drilled, the slider 19 is raised to pull out the pipe electrode 21 from the machining start hole, and the workpiece mounting base 4 is moved to position the lid directly below the pipe electrode 21 at the position where a new machining start hole is to be drilled. After that, the process of performing the above-described drilling process to create machining start holes is repeated, and a predetermined number of machining start holes are made in the workpiece 4. After that, the workpiece 6 is either left attached to the workpiece mount 4 or removed from the workpiece mount 4, and after removing the remaining part of the bottom trap of all machining start holes, the automatic twist electrode tensioning device (as shown in Figure VCFi) is used. (Although it is not provided, it is provided with slider 19Klill at the tip of column 1.)
Insert the Tsuya electrode 7 into the first machining start hole using the
Perform normal wire cut electrical discharge machining. If machining of one group cannot be completed in this way, after cutting the wire electrode 7, move the workpiece mounting base 4, and then open the machining start hole directly below the pipe electrode 21 (through which the wire electrode 7 will be inserted). Then, the slider 19 is lowered in the Z-axis direction, and the pipe electrode 21 is inserted into the machining start hole that has just been drilled.

At this time, it is best to spray machining fluid from the tip of the pipe electrode 1121 and spray 1 tK of machining fluid on the electrode scraps, but it is necessary to cause an INIK spark discharge between the workpiece and the pipe electrode 21. Slider 1! until the tip of the pipe electrode 21 protrudes from the other layer of the machining start hole. Let it hang down. Edited by Jin's movements lol! When all the shavings, dirt, and dust that had been stuck inside the I-Shidai were removed and the inside was purified, it became K. Note that the hanging speed of the slider 19 does not have to be as slow as when drilling a hole; for example, when moving the wire electrode to the processing position (
It may be a fast speed similar to a dry run mode in which fast forwarding is performed.

Next, after raising the slider 19 and pulling out the pipe electrode from the machining start hole, the wire electrode is inserted into the cleaned nine machining start holes using an automatic wire electrode tensioning device.
Spark discharge is generated between this wire electrode and the workpiece, and the next group of electrical discharge machining is performed. Once the second group of electrical discharge machining is completed, the third group can be machined as needed.
Perform cleaning work on the machining start hole of the group 〇In addition,
In the present invention, information for locating the machining start hole that requires cleaning directly below the pipe electrode is obtained within the numerical control device attached to the electric discharge machine (using position information of a certain machining start hole, for example, A register for storing the position of the machining start hole is separately provided in the numerical control device, and the position information of the machining start hole read from the memory in the numerical control device is stored when drilling the machining start hole. This register is stored and when cleaning the machining start hole, the K111 is configured to position the machining start hole directly under the pipe electrode using the stored position information.

As explained in detail above, according to the present invention, before inserting the wire electrode into the machining start hole, the pipe electrode is inserted into the machining start hole to remove cuttings or the like that are clogged in the machining start hole. This allows you to easily and smoothly insert the gloss electrode (
A machining start hole (E is formed when inserted through the workpiece). Therefore, it is possible to fully automate machining such as drilling a plurality of machining start holes and then performing wire cut electric discharge machining on the workpiece.

[Brief explanation of drawings]

The figure is a side view of a wire-cut electric discharge machine used in the implementation of the present invention. 1! Column 28 units Base 4: Workpiece mounting base 6t Workpiece 7: Wire electrode 19S slider 20: Machining start drilling member
21! Pipe electrode patent applicant: Representative of Fujitsu 7 Anatsuku Co., Ltd. Patent attorney: Mr. Tsuji, 2 persons

Claims (3)

[Claims] (1) After performing wire cut electrical installation on a workpiece that has multiple machining start holes through which wire electrodes are inserted, before inserting the wire electrode into the next machining start hole, perform machining on the next machining start hole. A machining method for a wire-cut electrical discharge machine, characterized in that the inside of the machining start hole is cleaned by inserting an electrode for drilling the start hole. (2) Using a pipe electrode as the electrode for drilling the machining start hole - 1. Spray machining fluid from the tip of the wire electrode or push the pipe electrode to the next machining start hole while supplying machining fluid to the shoulder of the pipe electrode. A machining method for a wire-cut electric discharge machine according to claim II, wherein the wire-cut electric discharge machine is made to pass through the wire. (3) The pipe electrode is inserted into the next machining start hole while applying JIIK electrical discharge pressure between the pipe electrode and the workpiece.Claim 0@H Building C2) Item 1! Owaiyaka, tomonden processing iso ptIQ=fi melon.