JPS63114821A - Wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To grasp the replacement timing of a wire electrode as well as to make any machining failure preventable from occurring before it happens, by making the residual quantity of a wire, subtracting feed rate from wire electrode overall length at the time of charging a feeding wire reel, so as to detect and display it in a digital manner. CONSTITUTION:A detection roller 9 is accurately rotated in proportion to feed rate by winding a wire 2 one turn or the like and feeds a waveform shaper 11 with an encoder signal conformed to the feed rate of a wire electrode 2 obtained by rotating the wire 2 together with a light or magnetic encoder 10, and if it is taken out as the shaped pulse waveform and fed to a calculator 12, feed length of the wire is findable on the ground that how many pieces per one pulse, for example, as one micro come out. On the other hand, an overall length L of the wire electrode rolled on a new reel is inputted into this calculator 12 in advance at that point that this new reel has been set. Therefore, inside the calculator 12, the feed rate of the wire is subtracted from the overall length L successively, and the result is displayed on a display unit 13 as the residual quantity DELTAL.

Description

[Detailed description of the invention] [5-q Arashi Jeg The present invention relates to a wire-cut electrical discharge machining device.

A proposal has been made (Japanese Unexamined Patent Publication No. 56-7628) to check the remaining amount of wire in a conventional wire-cut discharge power Loe device by observing changes in the diameter of the winding of the reel, etc. .

In addition, a method for checking the end of winding of a wire reel has been proposed (Japanese Patent Application Laid-Open No. 58-28428).

Problems During continuous unmanned machining, a shortage of wire electrodes during machining causes problems such as decreased efficiency and poor machining accuracy, such as having to stop machining midway and re-machining.

However, the thickness of the wire is small, and the diameter does not change easily due to decreases or increases in one turn, so an accurate indication of the progress of the wire has not been possible with previous proposals.

11 Solution Taking into account the disadvantages of this method, the present invention digitally grasps the feed amount of the wire electrode and subtracts the wire feed amount from the total length of the wire electrode when loading the feeding wire reel. The remaining amount of wire is digitally detected and displayed, and with this VC, you can accurately know the remaining amount in advance before continuous operation for a long time, and there is no chance of running out of wire electrodes during a long period of continuous operation. This problem is solved by replacing the wire reel with a new wire reel during machining, thereby achieving excellent machining results.

"Customize" this error to make sure that exactly 1 wire remains at each point.
etc. are detected and displayed.

To explain the present invention using the preferred embodiment configuration diagram shown in FIG. 1, 1 is a feeding wire reel, and a wire electrode 2 is a powder clutch 3
Or take up the brake roller 4 with a torque motor and the DC motor 5! A certain tension is applied between the wire 70 and the roller 6, and then the wire is wound onto the take-up reel 8. A machining power source (not shown) is coupled between the wire electrode 2 and the workpiece 7 on the way, and 7IO EVALS is supplied to generate electric discharge and perform cutting as in the conventional manner.

Further, the detection roller 9 is used to wind the wire 2 one turn at a time, so that the wire 2 is rotated accurately in proportion to the amount of feed. It is input into the waveform shaper 11 as an encoder signal according to the amount, shaped, and then taken out as a pulse waveform and inputted into the calculation device 12Vc, where the length can be determined by the number of 1 micron per pulse, for example. On the other hand, the total length of the wire electrode wound on the new reel is input into the calculation device 12 in advance when the new reel is set.

Therefore, inside the calculation device 12, the total length is sequentially subtracted, and the result is displayed on the display device 15 as the remaining amount L.

FIG. 2 shows another embodiment, and its operating mode is as follows.

While Figure 1 shows an analog tension adjustment mechanism, 1
This example shows an embodiment of a wire-cut electric discharge machining apparatus equipped with a digital tension adjustment mechanism. For convenience, the parts of the first figure are designated by the same reference numerals. 1 is a feeding wire reel, and a wire electrode 2 is wound around a pulse motor 8 in the same way as a brake roller 4 of a pulse motor or a DC servo motor 5. Above 3. The motors 5 and 5 are each driven by digital commands from the drive device. In the middle, a machining power source (not shown) is connected between the wire electrode 2 and the workpiece 7, and machining pulses are supplied to each of them to generate electric discharge, and 770 machining operations are performed as in the conventional method.

Reference numeral 17 is a tension setting device that can easily set the optimum tension for various conditions based on information such as the wire electrode length, wire material, material of the skin to be worked, and thickness of the work to be performed, as well as inputs when replacing the wire reel. At the same time as retrieving the memory condition F, the total length of the wire electrode is determined and the respective values are input to the calculation device 12 and tension calculation device 14. The tension value for the wire electrode is determined by a tension calculation unit [14] which calculates the drive speed required for the take-up roller 6 and the brake roller 4, and supplies a drive pulse P to the drive power source 15 to drive the drive motor of the take-up roller 6. . Further, a drive pulse (P-bP) is given to the drive electric 1M16 so as to drive the drive motor 5 of the brake roller 4.

As a result, a tension force equal to the speed difference P between the brake roller 4 and the take-up roller 6 is supplied to the wire electrode 2 between them, and the wire electrode is fed at the speed of the drive pulse P. At the same time, the drive pulse is sent to the calculation device 12 and subtracted from the total wire length already stored in the calculation device, and the resulting value is sent to the display device 15 and displayed sequentially. On the other hand, when the wire reel is replaced with a new one, a display clear signal is output to the display device 15 at the ninth point in time, and the next time a new wire reel is installed, the total length of the wire is re-inputted into the calculation device 12.

According to the present invention, the amount of wire electrode feeding is digitally grasped, the amount of wire feeding is accurately subtracted from the total length of the wire electrode at the time of loading, and the remaining amount of wire is detected and displayed. , the wire knows when to replace the electrode, prevents machining defects, and improves machining efficiency overall.

[Brief explanation of the drawing]

FIGS. 1 and 2 are system diagrams of different embodiments of the present invention. In the figure, 1.8 is a feeding layer winding reel, 2 is a wire electrode,
5 is the Bakuda clutch, 4 is the brake roller. 5 is a Do motor, 6 is a take-up reroller, 7 is a workpiece, 9
is a detection roller, 10 is an encoder, 11 is a waveform shaper,
12 is a computing device, and 15 is a display device. 14 is a tension calculation device, 15.16 is a drive power source, and 17 is a tension setting device. Figure 1

Claims (1)

[Claims] Wire-cut electric discharge machining equipped with a wire electrode remaining amount display device that digitally grasps the wire electrode feed amount and digitally displays the remaining wire amount by subtracting the wire feed amount from the total wire electrode length when loading the wire reel. Device.