JPS63180422A - Electric discharge machine for narrow hole - Google Patents

Abstract

PURPOSE:To automatically replace a electrode with a new one by deciding that the electrode is in an irregular state during detection and to enable execution of continuous automatic machining, by providing an electrode length detecting mechanism which checks the length of a electrode and detects that the length is too decreased to allow execution of machining. CONSTITUTION:In a state that, through replacement of an electrode with a new one, a electrode 16 is inserted through an electrode guide 40 and is positioned facing a workpiece 10, a detecting limit switch 15 is not turned ON by a detecting dog 13 of an electrode length detecting mechanism. Thereafter, when, after completion of machining made some times, the electrode 16 is too worn to allow machining, the detecting limit switch 15 is turned ON by the detecting dog 13, and the state is reported to an NC device. Thereafter, the sequence of a machining program is varied to a new and old electrode exchange program by means of the sequence varying mechanism of the NC device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Pressure Industry] The present invention relates to a small hole W1. This relates to a small-hole electrical discharge machining device that detects the length of the pole (and automatically replaces the electrode with a new one if the electrode length becomes impossible to machine).

[Conventional technology]

FIG. 2 is an explanatory diagram showing, for example, a conventional small-hole electrical discharge machining apparatus. In the figure, αG is a workpiece stored in a machining tank and immersed in an insulating machining fluid C4, and the workpiece αG is passed through the machining fluid (b) to a small hole electrode α0. I am facing him. Machining fluid α41# is circulated between the external tank (to) and the machining tank @, and from the machining tank @ to the tank (
The machining fluid α4 returned to the machining tank (to) and stored is injected by the pump P from the nozzle (4) into the gap between the workpiece QG and the small hole electrode Qf9 in the machining tank (2). The relative motion between the workpiece αG and the small hole electrode αQ is controlled by moving the table on which the workpiece αG is placed using the X-axis drive motor (to) and the X-axis drive motor (e). Move in a plane containing 1
z*Ill drive motor (
(to), move the small hole electrode up and down by 1, 1, and
6 is rotated arbitrarily by a C5WA dynamic motor (7). Also, the small hole electrode αG is fixed tightly and insulated from the small hole electrode, and is prevented from swinging during machining by passing through the electrode guide (2). Q
is a machining power supply that supplies a commercially available power supply between the small hole*mcm and the workpiece αO, such as DC f, switching element Tr, capacitor C1 charging resistor,
and a sweeping element control circuit (to). (6) is a self-S electrode exchange device for exchanging the small hole electrode α0. (to) is each A, Y, Z.

It is an NO device consisting of an automatic control device such as a drive motor (to), (to), (to), a field drive or an electrode exchange equipment, a copying device, or a wtm machine, etc.).

Figure 8 shows the machining f in the small hole discharge D Loe equipment field in Figure 2.
It is a waveform diagram showing the waveform of a pulse train output from [Co., Ltd.]. The figure shows a pulse train output by the switching cable Tr of processing tm(2), where IP is the first flow peak value, τp is the pulse width, and τr is the pulse pause width.

[Problems to be Solved by the Invention] Since the conventional small-hole electric discharge machining apparatus is configured as described above, each machine that drills a large number of small holes in a workpiece can only machine one small hole wx'Mi. Replacement with a new one, which involves supervising the first-time worker working at the factory (the amount of work that can be done is limited), or
The amount of machining that can be done with one small hole wL apple is predicted, the amount of machining is replaced with the number of times of machining, and the electrode is replaced with a new one based on the number of times of machining.

In the first case, machining can continue without operator supervision and manual intervention.
In the latter case, even if the conditions for replacing the electrode with a new one are based on predictions, there are problems such as the T-shaped electrode not being able to be used efficiently, or machining failures occurring due to the electrode exceeding its limit length. T-ko.

This invention solves the above-mentioned problems and is designed to solve the problems mentioned above. When checking the length of the pole, it is detected that the length cannot be machined. At this point, it is determined that the state is incorrect, and the machine is replaced with a new electrode, and the process is continued. Kemeichi aims to obtain a small hole electrical discharge machining device that can perform automatic machining.

[First Means to Solve the Problem] The small hole electrical discharge machining apparatus according to the present invention is capable of processing a small hole electrode in the process of machining a large number of small holes in a workpiece, so that the length of the small hole electrode becomes impossible to machine. A mechanism is added that allows the output signal from the electrode length detection mechanism that detects f here to be checked at the end of each machining process, and the sequence can be changed by one according to the state of the signal.

[Effect]

The small hole electrical discharge machining device in this invention is! The output signal from the ff1s length detection mechanism is read into the NC5jtI11 by the port reading mechanism at the end of each machining process.

If it is detected that the thin and large electrode has reached a length that cannot be processed, the program changes the sequence to replace the electrode with a new one. In this case, the reading of the signal from the electrode length detection mechanism and the sequence change are all performed by the NO command in the Canadian program.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

m1 diagram (d), (b) box t7) M hole virf according to the invention! ! This is an explanatory diagram showing the relationship between the small-hole electrode (16), the electrode guide, and the workpiece αO, which is attached to the narrow-large electrode fixed shank Uη when processing the workpiece QG using IIaeyt. (to) is'R
, This is the convenient door for the pole length detection mechanism, which is attached to the main movable part 1111QI so that it can follow the movement of the electrode.
・It is attached to the fixed side where the spindle a is attached. Detection C3 and detection remy,
The relative relationship of the Tosui TJ tip α9 approaches as the fine hole W pole αG wears out, and when the fine hole electrode αQ reaches a length that cannot be processed, the detection hole (13 is Detection limit, ・I tosui, ・・chi09 to O [・,at this time,
Detection limit..., Tosui, Richi 4 outputs the result to the HeC device (to).

Figure 1 (81) shows the state before machining after replacing the electrode with a new one and inserting a small hole into the ionization guide with the pole αG facing the workpiece tlG. At this time, the detection pulse of the electrode length detection mechanism is the detection 'J E
-+ Tosui...tchi0!5 (JN(, not.

The first [] (1)) is the small hole electrode QQ after several rounds of machining.
If the length of the small hole W pole αQ is the same, the electrode guide shaft and the small hole electrode fixing shank αη will interfere with each other during the next machining, damaging the electrode guide and causing machining failure. This is the machining limit length of the small hole 11c pole uQ that is possible. At this time, the detection limit αa is the detection limit 2 point...
・Change C to O and notify the above state to C device (to).

Here, there is no need to change the sequence of the actual Canadian program! (to) is realized by a boat reading mechanism, a condition judgment mechanism, and a sequence change mechanism for the executed Canadian program, all of which are performed by NC commands in the Canadian program. An example of a Canadian program is shown below.

In addition, the output of the detection 'J
4C device! ! (to) is input to the boat 10.

■To lO;... Sequence number 10 ■Tli
・・・・・・・・・Replace with the next electrode Go to ■20;・・
...Sequence number 20■G29Z-5; ...
...zIIIn Detect contact position in negative direction 0M 84 ; ...... Katana Roe size! 0
To 1r■G I Z -5,i...Z@Machining 5ff in the negative direction 0M85;...Machining electric S! Turn off.

■G14X50Y10P7i...Input boat l
Load O into [50■G201A10Bf1500i;...fi5
If 0 is 11', the sequence number is 10. 4i) G200A20;... Sequence number! 2
0 hejisenbu.

According to the program Cζ, the electrodes are exchanged in steps ① to ⑶, and contact position detection and machining are performed on two axes.

In step (2), the output of the detection +r t s+ switch I is read, and in step (2) the output is determined, and the sequence is changed by one step according to the case, including the [phase]. Therefore, if the length of the small hole w pole is still long enough to be machined, the process is executed in the order of ■→■-■, and the iF pole exchange is not performed.

If the length of the small-hole electrode is such that it cannot be machined, in other words, if it becomes impossible to process, then restart the f-pole exchange in the order of ■→■→■. executed. Incidentally, in the above-mentioned embodiment, the processing in the case where the fine-hole electrode becomes impossible to process can be freely changed by the one-time operator who is managed by the Nani program.

〔Effect of the invention〕

As described above, according to the present invention, the length of the small hole electrode is detected by the detection limit, the output limit, and the H switch, and the output of the detection limit is read into the C unit. Configure it to be managed with 10 nib programs and use this small hole Wi! ! 11 becomes a length that cannot be processed. In this case, the processing can be freely determined (ζ), and there are remarkable effects such as being able to perform self-operation as the worker intends.

[Brief explanation of the drawing]

Fig. 1 (!L1. (b) is an explanatory diagram of the operation of the embodiment of the present invention, Fig. 2 is an explanatory diagram showing an example of a conventional small-hole electric discharge machining device, and Fig. 3 is a machining W in a small-hole electric discharge machining device. E' is a waveform diagram showing the waveform of the pulse train output from #. (IG is the mD loe snout, (to) is the detection door, a9 is the starting limit, tosui, chi, αG is the small hole electrode, ( (to) is a ΔC device. In the figures, the same reference numerals indicate corresponding parts.

Claims (1)

[Claims] The relative movement between the workpiece and the fine-hole electrode is commanded using an NC device equipped with a boat reading mechanism, a condition judgment mechanism, and an electrode length detection mechanism, and the electric current supplied between the workpiece and the fine-hole electrode is controlled. In a small-hole electric discharge machining device that processes the workpiece into a desired shape by generating an electrical discharge phenomenon using energy, the length of the small-hole electrode that is consumed as the machining progresses is confirmed by the electrode length detection mechanism, and the machining A small-hole electrical discharge machining device characterized by having a mechanism for automatically replacing the small-hole electrode with a new small-hole electrode when the electrode length becomes impossible.