JPS629826A - Machining process displaying method for wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To facilitate decision of the acceptability of work and planning of re-machining by storing the wire co-ordinates of NC tape and block number into controller and displaying at proper time upon occurrence of disconnection of wire under machining or jumping to other process. CONSTITUTION:When the wire is disconnected at the point departed more than 0.5mm, for example, from the ending point of machining and the shortcircuit/ disconnection counter will reach to a setting count, the co-ordinates at that position, the block number and the disconnection are stored in the memory of controller. Then said counter is reset to prepare for disconnection wire supply and to proceed to next process, if any, while end if none. While when shortcircuit longer than 30sec has occurred at the point separated more than 0.5mm from the ending point of machining and the shortcircuit/disconnection counter has reached to a setting count, the co-ordinates of said position, the block number and the shortcircuit are stored in the memory of controller. Thereafter, said counter is reset to prepare for shortcircuit wire supply and to proceed to next process, if any, while end, if none, while to display the stored data onto CRT or printer upon finish of machining.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a machining progress display method for a wire-cut electrical discharge machine equipped with an automatic wire electrode feeding device.

b. Conventional technology The recent trend in wire-cut electric discharge machines is that the CNC method is common. FIG. 7 shows an example of this, which is comprised of a processing machine main body, a servo device, a processing power supply device, an NC tape production device, a control device, and the like. Control I device is C
The PU is centered on the control program, memory, MDI, tape reader, input/output interface, etc., and in addition to controlling the contour of the processed shape of the workpiece, it also has processing control functions that enable high-efficiency processing and various operations. It has automation functions.

The automatic wire feeding device is one such device, and has automatic wire feeding and wire breakage and wire short circuit processing functions. The automatic wire supply function automatically sets the wire electrode in the starting hole for machining, and is an indispensable function for automation because it is fully automated without human intervention when machining multiple holes.

In addition, the wire breakage and wire short circuit automatic processing function automatically processes the wire when a wire breakage or short circuit occurs during machining, returns to the machine start hole, automatically feeds the wire, and then restores the original wire breakage or short circuit. It returns to its position and resumes machining. This function is also indispensable for automation, and is an extremely effective function in reducing the worker's work of monitoring the processing machine.

Furthermore, in recent years, these functions have been further enhanced, and if wire electrodes are not successfully supplied even after a predetermined number of automatic feedings, or if disconnection or short circuit occurs more than a predetermined number of times, the process can be stopped, A jump function has been added to jump to the next process and perform processing. This function is particularly effective in improving machining efficiency when machining a large number of holes.

C. Problems to be Solved by the Invention Through such automation, the processing efficiency of tIi electrical machining has been dramatically improved, but when the workpiece is removed from the machine after processing is completed, wire breakage occurs for the first time. Unfinished parts were discovered due to short circuits, etc., and there were problems with the second cutter etc. Also, without processing halfway or not at all,
For processes that have been reprocessed, when processing them again,
There was a problem in that the circumstances leading to the jump were unclear, and the operator was confused about setting the machining conditions.

This invention was made by focusing on these problems, and includes the following: determining the quality of machining of a workpiece, determining the necessity of a second cut, selecting machining conditions during finishing machining, and determining jump steps. It is an object of the present invention to provide a processing progress display method that can easily create a re-addition program.

Means for Solving the d0 Problem In order to achieve the above-mentioned object, the present invention provides a wire cut electric discharge machine equipped with an automatic wire feeding device, in which wire breakage and short circuits and jumps to other processes occur during machining. In this case, the coordinates and block number of the wire of the NC tape are stored in the control device and displayed at appropriate times.

00 Effect In the electric discharge machine described above, the block number and coordinate values of the NC tape are stored in the memory of the control device every time a wire breakage or wire short circuit occurs. In addition, if the control device determines that automatic wire feeding is impossible, or if wire breaks or short circuits occur frequently and the control device determines that it is impossible to continue the process, the control device stored in memory. The stored machining history information is displayed or printed on a CRT or printer at an appropriate time, for example, after machining is completed.

Therefore, based on this machining history information, the operator can judge whether the workpiece is good or not and whether a second cut is necessary, select the machining conditions for finishing machining, judge whether the start hole position and drilling method are good or not, and decide whether the skipped process is correct or not. It is possible to easily create a Canadian program.

f. Example Next, an example of the present invention will be described based on the drawings. FIG. 6 is an explanatory diagram of a wire-cut electrical discharge machine equipped with an automatic wire feeding device in which the method of the present invention is implemented. That is, the wire cut electric discharge machining Ta1 includes a supply reel 5 that supplies the wire electrode 3, a pulley 7, a brake unit 9,
A lift roller 11, a vertically movable Z axis 13, a pinch roller 15 provided on the Z axis, and an upper guide (nozzle) 17
, lower guide (nozzle) 19, lower roller 21, winding roller 23, unloading roller 25, clamp unit 27,
It is composed of a cutter unit 29 and the like.

The supply reel 5 is driven by a delivery motor 5-1,
The brake unit 9 includes a tension clutch 9-1, a brake roller 9-2, etc., and adjusts the tension of the wire electrode 3. The lift roller 11 is attached to the machine frame and can be moved vertically by a solenoid 11-1. The pinch roller 15 grips or releases the wire electrode 3 by the solenoid 15-1, and the pinch roller 15 grips or releases the wire electrode 3 by the motor 15-2.
It serves to send the wire electrode 3 downward at a constant speed.

The upper guide (nozzle) 17 is provided below the Z-axis 13, and incorporates a machining fluid supply nozzle and a power supply die. The Z-axis 13 is configured to be vertically movable by a drive motor 13-1 and a screw mechanism 13-2 attached to the machine frame. The upper limit of the Z axis is the detector 13-3. The lower limits are detected by detectors 13-4 and 13-5, respectively.

The lower guide (nozzle) 19 is provided below the workpiece W, and similarly to the upper guide, a machining fluid supply nozzle and a power supply die are incorporated therein. A winding motor 23-1 with a variable speed is attached to the winding opening roller 23, a carrying-out motor 25-1 is attached to the carrying-out roller 25, and a lower roller 521
And on the carry-out roller 25, a detector 21- of the wire electrode 3 is installed.
The standard is 1.25=2.

The clamp unit 27 consists of an air cylinder 27-1 and a piston rod 27-2 provided in the machine frame, and when the compressed air is switched by the switching valve 27-3, the piston rod 27
-2 moves in the vertical direction.

A detector 27-4 is provided at the upper end of the air cylinder to detect the lower limit of the cutter unit, which will be described later.

A cutter unit 29 is provided at the lower end of the piston rod 27-2 of the clamp unit 27, and can move in the vertical direction together with the piston rod and can rotate any number of 90 degrees. In this figure, the Z-axis 13 is raised and the piston rod 27-
2 remains still, the cutter unit 29 rotates 90 degrees, and Z
A state in which the solenoid 29-1 is set below the shaft is shown.

The state in which the cutter unit 29 is stored in a predetermined position and the state in which it is pitted as shown in the figure are detected by the cutter storage detector 29-2. and is detected by the cutter set detector 29-3. The wire electrode 3 is gripped or released by clampers 2-4. This operation is performed using solenoid valve 2.
It is carried out by 1-5. The wire electrode is cut by applying a voltage between the clamper 29-4 that grips the wire and a power supply die built into the upper guide 17, and melting the wire. Cutting is detected by using a wire provided on the lift roller 11. This is done by cut completion detector 2-6.

Compressed air is also used for wire removal and guide cleaning, which are performed by switching the switching valves 31 and 33, respectively. The machining fluid is stored in tank 35. Pump 37° Filter 39. The wire is supplied to the nozzle of the upper guide 17 through a circuit including a water jet switching valve 45 and a flow rate regulating valve 47 during wire supply via a second cut switching valve 41 and a flow rate regulating valve 43 connected in parallel thereto. During machining, the machining fluid is supplied to the nozzles of the upper guide 17 and the lower guide 19 through a circuit including the machining fluid supply switching valve 49, the flow rate adjustment valve 51, and the flowmeter 53 cap. Note that illustration of the taper processing device is omitted for the sake of clarity.

Next, the operation of this automatic wire supply device will be explained separately for automatic wire supply, wire supply preparation in case of wire breakage, and wire supply preparation in case of short circuit.

Automatic wire feeding automatically inserts a wire electrode into the starting hole of the workpiece and consists of the following operations.

(1) Lower the lift row 511.

(2) Avoid lowering the Z-axis 13.

(3) The detectors 13-4 and 13-5 sequentially detect the position of the Z-axis, the Z-axis is decelerated, and the upper nozzle 17 comes into contact with the workpiece W and stops.

(4) Turn on the electromagnetic switching valve 33 for a certain period of time and clean the upper and lower guides 17' and 19 with compressed air.

(5) Operate the hoisting motor 23-1.

(6) Operate the pump 37, operate the water jet switching valve 45, and inject machining fluid from the nozzle.

(7) Operate the pinch roller motor 15-2 to feed the wire at a constant speed.

(8) The detectors 21-1 and 25-1 provided on the lower roller 21 and the carry-out roller 25 detect the passage of the wire.

In step (8), the wire is detected and the task is completed, but if the wire is not detected within the predetermined time,
It is determined that a wire breakage has occurred, and work is performed to prepare the wire for the next wire breakage.

Preparation for wire supply in the event of a wire breakage is a measure to be taken when a wire electrode breaks during processing, and consists of the following operations.

(1) Operate the hoisting motor 23-1 and collect the broken wire.

(2) Raise the 7th axis 13.

(3) The Z-axis upper limit detector 13-3 stops the Z-axis from rising.

(4) Lower the cutter unit 29.

(5) When the cutter lower limit detector 27-4 detects the lower limit of the cutter unit, it is rotated by 90 degrees and set at the wire cutting position by the cutter set detector 2-3.

(6) Grip the wire 3 with the clampers 29-4 built into the two cutter units.

(7) Hold the brake roller of the brake unit 9 to prevent the wire electrode 3 from moving.

(8) Raise the lift roller 11 and move the clamper 29
-4 Apply tension to the wire between the handle rollers.

(9) Grip the wire with the pinch rollers 15.

(10) A current is passed between the power feeding die assembled in the upper guide 17 and the clamper 29-4 to heat and cut the wire. Wire cut is detected by wire cut completion detector 29-
6.

(11) This work is completed by storing the cutter unit. In order to continue machining, the wire must be returned to the machining start hole, and after the automatic wire feeding operation described above, the wire must be returned to the disconnected position and reworked.

Preparation for wire supply in the event of a short circuit is a process to be performed when a short circuit occurs in the electrode wire during processing, and consists of the following operations.

(1) Raise the Z-axis 13.

(2) The Z-axis upper limit detector 13-3 stops the rise of ZIIIll.

(3) Lower the cutter unit 29.

(4) When the cutter lower limit detector 27-4 detects the lower limit of the cutter unit, it is rotated 90 degrees and set at the wire cutting position by the cutter set detector 29-3.

(5) Grip the wire 3 with the clamper 29-4 built into the cutter unit 29.

(6) Hold the brake roller of the brake unit 9 to prevent the wire electrode 3 from moving.

(7> Raise the lift roller 11 and move the clamper 29
Apply tension to Y-V between -4 and the lift roller.

(8) Grip the wire with the pinch rollers 15.

(9) A current is passed between the power feeding die assembled in the upper guide 17 and the clamper 29-4 to heat and cut the wire. Wire cutting is detected by wire cut completion detector 29-6.
It is carried out by

Extension) Cutter unit storage (11) Operate the hoisting motor 23-1 and collect the cutting wire.

With the above steps, this work is completed. In order to continue machining in the same manner as the preparation for wire supply at the time of wire breakage, it is necessary to return to the kani start hole and perform the automatic wire supply operation.

If a wire breakage is determined in step (8) of automatic wire supply, the wire supply preparation work at the time of wire breakage will be violated, and the automatic wire supply work will be performed again.
Counted by a counter.

When the count number by the RETRY counter reaches the set value, it is determined that automatic supply is impossible, and the process is interrupted.
If there is another processing step, jump to that step.

Even when a short circuit or wire break occurs in the wire, the number of occurrences is counted by a short circuit break counter, and when the count reaches a set value, that process is interrupted, and if there is another process, the process jumps to that process.

In such a case, the work is completed with the workpiece still unfinished, but if the circumstances surrounding the interruption of machining are made clear, it becomes easier to rework the unfinished product and select machining conditions. Next, an embodiment of the present invention will be described with reference to flowcharts shown in FIGS. 1 to 3. In this flowchart, the operations during taper processing are omitted for the sake of simplicity.

If wire ψ breakage occurs within 0.5mm from the end point of machining. In this case, since the unfinished portion is small, the machining is stopped, the short circuit/disconnection counter is reset, and the coordinates of this position, the block number, and the unfinished machining are stored in the memory of the control device. Part A. Thereafter, preparations for supplying the wire at the time of wire breakage are made, and if there is a next step, the process proceeds to that step, otherwise the process ends.

If a short circuit of 30 seconds or more occurs within 0.5III1 of the processing end point. In this case as well, the short circuit/disconnection counter is reset in the same way as for the wire breakage described above, and the coordinates of this position, the block number, and the machining incompleteness are stored in the memory of the control device. B
Department. After that, carry out the wire supply procedure for short circuit described above, and if there is a next step, proceed to that step, otherwise complete the process.

If a wire breakage occurs at a location Q5 mm or more away from the processing end point and the short circuit breakage counter reaches a set value, the coordinates of that position, block number, and wire breakage are stored in the memory of the control device. Part C. Thereafter, the short-circuit and disconnection counter is reset, and preparations for supplying the wire at the time of the aforementioned disconnection are made, and if there is a next step, the process proceeds to that step, and if there is not, the process ends.

If a short circuit lasting 30 seconds or more occurs at a location 0.5 mm or more away from the processing end point and the short circuit disconnection counter reaches the set value, the coordinates of that position, block number, and short circuit are stored in the memory of the control device. Part D.

Thereafter, the short-circuit-disconnection counter is reset, and preparations for supplying the wire at the time of the aforementioned short-circuit are made, and if there is a next process, the process ends if the process does not proceed to that process.

Wire breakage or short circuit for 30 seconds or more is 0.5% from the processing end point.
If the short circuit occurs at a distance of mm or more and the short circuit/disconnection counter does not reach the set value, the coordinates of the disconnection or short circuit position, the block number, and the disconnection or short circuit are stored in the memory of the control device. Thereafter, preparations are made to supply the wire in the event of a wire breakage or short circuit, and the wire is returned to the original starting hole and the automatic wire supply operation described above is performed.

When this work is completed, proceed from ■ in Figure 1 to ■ in Figure 2 (if not completed, proceed to each step as indicated by the arrow), reset the RETRY counter, run the wire electrode, and release the machining fluid. Supply the wire to the nozzle and move the workpiece so that the wire electrode is positioned 0°1 mm before the disconnection or short circuit position (memorized position).

If there is no wire breakage during movement (if there is a wire breakage, proceed to each step as shown by the arrow), restart the electrical discharge machining, and when the program is completed, reset the short circuit and wire breakage counter, and restart electrical discharge, machining fluid supply, and wire electrode running. Stop each. Furthermore, wire supply preparations (in the event of a short circuit) are performed, and if there is a next process, proceed to that process; otherwise, processing is completed.

When proceeding to the next step, the above-mentioned automatic wire feeding operation is performed in the start hole, and this case will be explained with reference to FIG. 3.

If the automatic wire feeding operation described above is performed and the wire is fed, or if the wire is fed within the set time in the RETRY mode described later, the RETRY counter is reset and the wire running, machining fluid supply, and discharge are performed. Processing begins after each step.

If insertion of the wire electrode into the start hole fails, RE
The TRY counter counts. If the RETRY counter does not reach the set value, automatic wire supply is repeated in the RETRY mode, which combines the above-mentioned wire supply preparation at the time of wire breakage and automatic wire supply. When the RETRY counter counts up, it is determined that automatic wire supply is not possible, and the process number and automatic wire supply disabled are stored in the memory of the control device. Part E. Next, the RETRY counter is reset, wire supply preparations are made (in the event of a short circuit), and if there is a next process, proceed to that process, otherwise the processing is completed.

The machining progress data thus stored in the memory of the control device can be stored at any time, for example, in the CR as shown in Fig. 4 after machining is completed.
displayed on the T or printer. From this diagram, the operator can clearly know the occurrence of wire breakage, short circuit, automatic supply failure, etc. and its location, ie, process number, block number, coordinates, etc. FIG. 5 shows an example of each process number, start hole position, and machining shape when machining a large number of holes on one plate.

9. Effects of the Invention As understood from the above explanation, the present invention has the structure set forth in the claims, so that the operator can perform <1) processing on the basis of the displayed processing history information. Judging whether the product is good or not and whether a second cut is necessary (2) Selecting processing conditions during finishing machining (3) Judging whether the starting hole position and drilling method are good or not (4) Creating a repeat nib program for the jumped process etc. can be easily carried out.

[Brief explanation of drawings]

1 to 3 are flowcharts of embodiments of this invention,
Figure 4 is an example of a machining progress display diagram, Figure 5 is an example of machining multiple holes, Figure 6 is an explanatory diagram of a wire cut electric discharge machine equipped with an automatic wire feeding device, and Figure 7 is a CNC wire cut electric discharge machine. It is a block diagram of a processing machine. Explanation of the symbols representing the main parts of the drawings 1...Wire-cut electrical discharge machine with automatic wire feeding device 3...Wire electrode 9...Brake unit 1
1... Lift roller 13... Z axis 15... Pinch roller 17... Upper guide (nozzle) 19... Lower guide (nozzle) 21... Lower roller 23... Winding roller 25
... Carrying out roller 17... Clamp unit 29
...Cutter unit Fig. 4 Fig. 5

Claims (1)

[Claims] If the wire electrode breaks, shorts, or jumps to another process during processing using the wire automobile feeding device, the NC
A machining progress display method for a wire-cut electric discharge machine, characterized by storing coordinates and block numbers of wire electrodes of a tape in a memory of a control device, and displaying the coordinates and block numbers in a timely manner.