JPH03111125A - Machining hour predicting method for wire electric discharge machine - Google Patents

Abstract

PURPOSE:To accurately and easily predict remaining machining hours by obtaining an average machining speed from the average machining control speed which is included in the machining condition data in a NC program, and by using this machining speed for calculating the remaining machining hours. CONSTITUTION:In a machining condition analyzing device 49, a machining condition command is analyzed for fetching the data of an average machining control speed, which are fed to an average machining speed storing device 43; and in the average machining speed storing device 43, these data values are stored as an average machining speed. Then, a remaining machining hour calculating device 46 calculates the remaining machining hours both from the circumferential length stored in a circumferential length storing device 45 and from the average machining speed stored in the average machining speed storing device 43, and the remaining hours are set to a display data table 47 and are displayed on a display device 48.

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to a method for predicting one hour of machining in a wire electric discharge machine, and in particular, to a method for predicting one hour of machining in a wire electric discharge machine, in particular, it is possible to know the remaining machining time with high reliability at the start of machining and during machining. This relates to time prediction method Q. [Prior Art] FIG. 3 is a configuration diagram showing a conventional wire discharge pressurizing device controlled by a numerical control device. In the figure, 1 is a workpiece as a workpiece, and 2 is a workpiece. 1 is fixed, a processing table 3.4 is a sliding part that slides the processing table 2 in the Y-axis and X-axis directions, and 5 and 6 are sliding parts 3 and 4.
are driven in the X-axis and Y-axis directions, respectively, and 7 is a numerical control device (hereinafter N
8 is a processing wire; 9 10 is a wire guy supporting the processing wire 8; 11 is a wire bobbin for feeding out the processing wire 8; 12 is a tension roller for feeding the processing wire 8; 13 is a wire winding roller for collecting the machining wire 8 after being used in electrical discharge machining, and 14.1.5 is a roller for applying a machining voltage between the machining wire 8 and the workpiece 1. A power supply unit, 16 is a power supply device for supplying machining voltage, 17 is machining fluid, 18 is a machining tank for storing machining fluid 17, 19 is a filter for filtering machining fluid 17, and 20 is for feeding machining fluid 17. pump,
21 is a nozzle for spraying the machining fluid 17 onto the workpiece 1 and the machining wire 8; 22 is a keyboard for performing various input operations to the NC device 7; and 50 is a machining tank 18. This is a machining fluid device consisting of a filter 19 and a pump 20. Figure 4 shows the wire electrical discharge machining apparatus shown in Figure 3.
FIG. 2 is a block diagram of processing for displaying machining time when machining is performed. In the figure, 31 is an NC tape, 32 is a tape league for reading the NC tape 31, 33 is a storage device that stores the NC program and calls it when necessary;
4 is an operation switch used for specifying an NC program, inputting data, or operating each device; 35 is a logic circuit for setting the NC program specified by the operation switch 34 and operating each device; 36 is a logic circuit N to check the program set by circuit 35
A C program inspection device 37 is activated by the NC program inspection device 36 and analyzes the set NC program; 38 is an NC program analysis device that analyzes data for operating the machine based on data provided by the NC program analysis device 37; Machine input/output device that outputs data to or inputs data from the machine to check the machine status, 39
is a wire electrical discharge machine controlled through a machine input/output device 38. 40 is a machining speed detection device that detects the machining speed from the output signal of the machine input/output device 38, 41 is a machining speed storage device that stores the detected machining speed, and 42 is machining speed data stored in the machining speed storage device 41. An average machining speed calculation device 43 calculates the average machining speed up to now based on the average machining speed calculation device 42. An average machining speed storage device 43 stores average machining speed data obtained by the average machining speed calculation device 42. Reference numeral 44 denotes a circumference measuring device for determining the machining total circumferential length of the machining shape of the workpiece, and 45 denotes a circumferential length storage device that stores the machining total circumferential length determined by the circumferential length measuring device 44, which is a machine input/output device. 38 instructions. Reference numeral 46 denotes a machining remaining time calculation device 47 that calculates machining remaining time from the machining total circumference stored in the circumference storage device 45 and the average machining speed stored in the average machining speed storage device 43;
48 is a display data table set to display the remaining machining time, and 48 is a display device that displays the data set in the display data table 47. FIG. 5 is a flowchart for explaining the operation for calculating the machining remaining time in the control shown in FIG. 4. Next, the operation will be explained. The workpiece 1 is fixed to a processing table 2, and this processing table 2 is driven by an X-axis drive motor 5 and a Y-axis drive motor 6, respectively.
The position is controlled by commands from the NC device 7 in the axial and Y-axis directions. In addition, a power supply section 1 is provided between the processing wire 8 and the workpiece 1.
4.15, a high voltage pulse voltage is applied from the power supply device 16. On the other hand, the machining fluid 17 in the machining fluid device 50 is fed by the pump 20 through the filter 19, and is supplied from the tip of the nozzle 21 to the contact area between the workpiece 1 and the machining wire 8. . As a result, the machining fluid 17 acts as a discharge medium between the workpiece 1 and the machining wire 8, causing electric discharge, and this discharge energy locally melts and scatters the discharge generating portion of the workpiece 1. That will happen. On the other hand, the NC device 7 has a CRT provided therein.
Processing is performed by controlling the drive of the X@ drive motor 5 and the Y-axis drive motor 6 according to commands based on the coordinates of the processing wire 8, processing conditions, etc. displayed on the device, and the graphic display. The tape 2 is moved two-dimensionally, and the workpiece 1 is machined into the shape specified by the NC device 7. Next, a method of calculating and displaying the remaining machining time until the end of machining will be explained. The remaining machining time is calculated from the machining total circumferential length of the machining shape of the workpiece and the machining speed during machining, and the process will be explained based on FIG. 4. First, a workpiece NC program is set in the logic circuit 35, and when the operation switch 34 is operated to obtain the machining total circumference length of the machining shape on the workpiece, the logic circuit 35
The NC program set in is passed to the circumference calculation device 44 to calculate the circumference, and the calculated circumference is stored in the circumference storage device 45. The remaining machining time is determined from the circumferential length and the machining speed during machining as follows. That is, in the same way as when calculating the machining total circumference length of the machining shape of the workpiece, the workpiece NC program is set in the logic circuit 35, and then the operation switch 34 is operated to perform machining of the workpiece. Then, the NC set in the logic circuit 35
The program is passed to the NC program inspection device 36,
After checking that there are no errors, it is passed to the NC program analysis device 37. The NC program analysis device 37 converts the data into data for keeping the wire electric discharge machine 39 stationary and passes the data to the machine input/output device 38. The machine input/output device 38 passes data to the wire electric discharge machine 39 to operate the machine, while updating the circumference in the circumference storage device 45 and receiving data from the wire electric discharge machine 39. Here, the data that the receiver takes is voltage between poles, servo data,
There is various data such as processing speed. Among these, the machining speed necessary to determine the remaining machining time is extracted by the machining speed detection device 40 and then stored in the machining speed storage device 41. The machining speed stored in the machining speed storage device 41 is converted into an average machining speed up to the present by the average machining speed calculation device 42 and stored in the average machining speed storage device 43. Then, the remaining machining time calculation device 46 calculates the remaining machining time from the circumference stored in the circumference storage device 45 and the machining speed stored in the average machining speed storage device 43, and then calculates the remaining machining time using the display data table 47. Display device 4
8 is displayed. Next, the process of determining the remaining machining time will be explained in detail using the flowchart shown in FIG. First, in step 5a, it is checked whether the sampling time (the time until the remaining machining time is updated) has reached, and if the sampling time is less than 0, step 5b
to initialize the sampling time. Next, in step 5C, a new average machining speed is determined by averaging the previous average machining speed and the current machining speed. Next, in step 5d, the remaining machining time is determined from the average machining speed and the outer circumference length, and the process returns. On the other hand, if the sampling time is 0 or more, step 5a
By sequentially moving to steps 5e and 5f, the sampling time and machining remaining time are updated with the time until the main process is called, and in step 5g, the outer circumference length is updated with the length processed before the main process is called.

[Problem to be solved by the invention]

Conventional wire electric discharge machines calculate the remaining machining time based on the average machining speed up to a certain point, so if the machining speed changes significantly during corner machining etc., the calculation of the remaining machining time will be greatly affected. There is a problem in that the reliability of the remaining machining time is greatly reduced because the remaining machining time increases or decreases. This invention was made in order to solve the above-mentioned problems, and provides a machining time prediction method for a wire electric discharge machine that can determine the remaining machining time with high reliability at the start of machining and during machining. The purpose is to

[Means to solve the problem]

The machining time prediction method for a wire electric discharge machine according to the present invention sets an average machining control speed corresponding to the thickness, material, wire diameter, etc. of the workpiece, and uses this average machining control speed as one of the machining condition data. The average machining speed is specified by the NC program included as , and the remaining machining time is predicted from this average machining control speed and the total machining length of the shape to be machined.

[Effect]

In the machining time prediction method of the wire electric discharge machine in this invention, the average machining control speed is determined by machining condition commands,
Since the remaining machining time is calculated from the machining total circumferential length determined by a function such as the graphic NC programm clock and displayed on the display device, the reliability of the machining time is greatly improved.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a machining time prediction method for a wire electric discharge machine according to the present invention will be described below with reference to the drawings. In FIG. 1, 31 to 39 and 43 to 48 indicate the same items as in FIG. 4. Reference numeral 49 denotes a machining condition analysis device that extracts data on the average machining control speed by inputting and analyzing the machining condition commands extracted from the NC program instructions by the NC program inspection device 36. Next, the operation will be explained. Note that the process of performing electric discharge machining and the process of determining the machining total circumferential length are the same as in the conventional example, so the explanation will be omitted, and the process of determining the remaining machining time will be explained. After the NC program to be machined is set in the logic circuit 35, when the operation switch 34 is operated to start machining the workpiece, the NC program set in the logic circuit 35 is passed to the NC program inspection device 36. In the NC program inspection device 36, the supplied NC program is inspected, and when it is confirmed that there are no errors, the movement N is
The processing is divided as follows depending on whether the command is a C program command or a machining condition NC program command. In the case of a moving NC program command, the NC program is
Pass it to the C program analysis device 37 and wire electric discharge machine 3
9 into data for operating the machine input/output device 38
Pass this data to. In the mechanical input/output device 38,
This data is passed to the wire electric discharge machine 39 to operate the machine, while updating the circumference value stored in the circumference storage device 45. Further, if the result of the inspection by the NC program inspection device 36 is a machining condition NC program command, the machining condition command is passed to the machining condition analysis device 49 . The machining condition analysis device 49 analyzes the machining condition command, extracts data on the average machining control speed, and supplies this to the average machining speed storage device 43. The average machining speed storage device 43 stores this value 2 as the average machining speed. Save as speed. The remaining machining time calculation bag W46 calculates the remaining machining time from the circumference stored in the circumference storage device 45 and the average machining speed stored in the average machining speed storage device 43, and displays this in the display data table 47. and display it on the display device 48. Here, the processing for determining the machining remaining time will be further explained using the flowchart shown in FIG. In step 2a, it is checked whether the sampling time (the time until the remaining machining time is updated) has been reached, and if the sampling time is less than 0, the sampling time is initialized in step 2b, and then in step 2C. The remaining machining time is determined from the average machining speed and remaining circumference length commanded as part of the machining conditions. On the other hand, if the sampling time is 0 or more, step 2d
In step 2e, update the sampling time and machining remaining time with the time until this process is called, and then in step 2
At f, the remaining circumferential length is updated with the length processed before this process is called, and the process ends at step 3. In the above embodiment, the average machining control speed is commanded as part of the machining condition command, but it may be issued as an independent command as the average machining control speed. Also, even if you allow people to configure settings using operation switches,
The same effects as in the above embodiment are achieved.

【Effect of the invention】

As described above, according to the present invention, since the average machining control speed corresponding to the machining conditions can be commanded as one of the machining condition data, the average machining speed data separated from the machining condition data can be used to calculate the remaining machining time. By using it in calculations, even if the machining speed changes due to changes in machining conditions, the calculation of remaining machining time will not be significantly affected, and as a result, the remaining machining time can be predicted accurately and easily. This has the effect of allowing efficient setup work for the next process.

[Brief explanation of drawings]

FIG. 1 shows a method for measuring the machining time of a wire discharge machine according to an embodiment of the present invention.
FIG.
The figure is a block diagram of a conventional wire electric discharge machine, Figure 4 is a block diagram of the part that calculates and displays the machining remaining time in the wire electric discharge machine shown in figure -i, and Figure 5 is a Flowchar = 1 showing the process of calculating the remaining machining time in the wire electric discharge machine shown in Part 3. ■...The machining object to be machined, 2...Add) - Chiful, 3.4...・Sliding part, 5.6... DESCRIPTION OF SYMBOLS 12... Tension roller, 13... Wire winding roller, 14.15... Power supply part, 16... Power supply device, 17... Processing liquid, 18... Processing tank, 19.
...Filter, 20...Pump, 21...Nozzle, 2
2...Keyboard, 31...NC tape, 32...
・Tape reader, 33...NC block 1 Kogera 1, storage device, 34...operation switch, 35...logic circuit, 3
6... NC program inspection device, 37... NC program analysis device, 38... Machine input/output device, 39...
・Wire electrical discharge machine, 40... machining speed detection device, 4
1... Machining speed storage device, 42... Average machining speed calculation device, 43... Average machining speed storage device, 44... Perimeter calculation device, 45... Perimeter storage device, 4G... Remaining machining time calculation device, 47...Display data chifuru, 48
...display device, 49...processing condition analysis device, 50.
...Machining fluid equipment. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] The plate thickness, material, and
In a wire electric discharge machine equipped with an NC control means that commands machining conditions corresponding to the wire diameter, etc., and measures and stores the entire machining circumference of the workpiece, the average machining control speed corresponding to the machining conditions is is included in the machining condition data in the NC program, and an NC program including this average machining control speed is supplied to the NC control means to perform machining control, and the average machining control speed is included in the machining condition data in the NC program. A machining time prediction method for a wire electric discharge machine, characterized in that an average machining speed is determined from an average machining control speed, and a remaining machining time is predicted from this average machining speed and the machining total circumference length given by the NC program command.