JPH07116926A - Wire connection condition display device for wire electric discharge machine - Google Patents

Abstract

PURPOSE:To display a history of the connection obstacle frequency by automatic connection operation with each time or plural times as a connection obstacle generating condition of a wire electric discharge machine by arranging a display device to display the display content according to information on a wire connection obstacle generating frequency. CONSTITUTION:Whether a condition of the sent-out wire 1 is put in a predetermined reference condition or an abnormal connection condition is detected by a wire reference condition detecting means 10. When it is abnormal connection, the generating frequency is found as a wire connection obstacle is generated. Information on the wire connection obstacle generating frequency is stored in a wire connection obstacle generating frequency information storage means 32 by a predetermined wire passage section and by automatic connection operation with every one time or plural times or by an average value of the automatic connection operation with every plural times. The display content according to the stored information on the wire connection obstacle generating frequency is displayed on a display device 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire connection state display device for a wire electric discharge machine that displays a wire connection state during automatic wire connection of a wire electric discharge machine, and more particularly, to a wire passing state in an automatic wire connection operation of a wire. The present invention relates to a wire connection state display device of a wire electric discharge machine that can display deterioration and the like in a mechanism part and can be used for judgment of maintenance.

[0002]

2. Description of the Related Art In a wire electric discharge machine, a wire electrode (hereinafter, simply referred to as a wire) is connected when a wire break occurs during electric discharge machining or when electric discharge machining is performed along another machining line. It must be made. This wire connection operates the wire feeding mechanism to feed the wire along the wire path, insert each part of the wire electric discharge machine, and make the tip of the wire reach the wire winding section corresponding to the end point of the wire path. Often performed by automatic wiring.

Conventionally, a technique for grasping the progress of wire connection in real time during such automatic wire connection operation has not been known. Therefore, for example, it is possible to visually determine which section of the wire path the wire tip is passing through. It was difficult to inform the operator etc. Therefore, it is difficult to easily know in which part of the wire path the wire is difficult to pass. In particular,
When a path failure (mostly due to a wire tip being stuck) occurs in any part of the wire path, it is impossible to immediately know where in the wire path the path failure occurred. It was

In order to solve this problem, the same applicant as the present invention stores the number of occurrences of wire connection failure for each preset wire path section, and based on the stored contents, the number of occurrences of wire connection failure. A wire connection status display device for displaying information has been proposed (Japanese Patent Application No. 5-1952).
No. 43).

[0005]

The display function of the conventional wire connection state display device is to integrate the number of occurrences of wire connection failures, which is the number of abnormalities in the automatic connection that occurred in the past, for each preset wire route section. Is displayed to indicate the abnormal state of automatic wire connection, and the abnormality of the wire electric discharge machine based on this display is determined by whether or not this integrated value exceeds a certain value. . However, in the determination of abnormality of the wire electric discharge machine by this method, there is a problem that the integrated value will eventually exceed the predetermined value in all sections and will be determined to be abnormal in the long term, and it will be determined in each section. There is a problem that it is not possible to deal with the case where the abnormal connection ratio is changed or when a temporary abnormal connection is detected due to some factor, and it is not possible to judge whether or not each section is abnormal. ing.

For example, in the figure showing the change in the number of abnormal wire connections shown in FIG. 10 depending on the number of automatic wire connection operations, if the wire path in FIG. 10A is not deteriorated, the abnormal wire connection for each automatic wire connection operation is performed. The number of times can be considered to be constant regardless of the number of times of the automatic connection operation, and the integrated value increases at a constant increase rate with the passage of the number of connection operations. On the other hand, when the wire path in FIG. 10B is deteriorated, for example, the abnormal connection number for each automatic connection operation has a large increase rate with respect to the number of times of the connection operation, and the integrated value is the connection value. As the number of operations increases, it increases at an even greater rate. In the above-mentioned conventional wire connection status display device, the abnormality determination of the abnormal connection is made only by determining whether or not the integrated value of the number of abnormal connection exceeds a predetermined value regardless of the number of connection operation times. 10) and (b) of FIG. 10 cannot be determined, and the state of deterioration of the wire path cannot be determined.

Therefore, the present invention solves the above-mentioned problems of the conventional wire connection state display device, and determines the occurrence state of the connection failure of the wire electric discharge machine by one or more automatic connection operations. An object of the present invention is to provide a wire connection state display device capable of displaying a history of the number of times on a display device.

[0008]

According to the present invention, there is provided wire feed amount detecting means for detecting the wire feed amount by the wire feed means at the time of automatic wire connection of a wire electric discharge machine, and the wire being in a predetermined reference state. The wire reference state detection means for detecting, and the wire connection fault occurrence frequency information, by the preset wire path section, and by the automatic connection operation once or multiple times or by the average value in the multiple automatic connection operations A wire connection state display device of the wire electric discharge machine is configured by the stored wire connection failure occurrence count information storage means and a display device that displays the display content based on the wire connection failure occurrence count information, and the wire feed amount detection means detects the wire connection failure occurrence count. Based on the output and the detection output of the wire reference state detection means, the wire connection fault occurrence frequency information is obtained and Stored in ya connection failure occurrence count information storage means, to achieve the object by displaying on the display device the display contents based on the stored contents.

In addition, the display content based on the wire connection fault occurrence frequency information is used as the number of wire connection fault occurrences in the wire route section, and is an average value of one or more automatic connection operation or multiple automatic connection operation. Separately, the history of wire connection abnormal states can be displayed by indicating the number of wire connection failures.

Further, the display content based on the information on the number of wire connection fault occurrences is used as an index for the maintenance of the wire electric discharge machine by making the history of the wire electric discharge machine such as the contamination state and the deterioration state in the wire path section. You can

[0011]

According to the present invention, with the above configuration, the wire feed amount of the wire fed by the wire feed means is detected by the wire feed amount detection means during the automatic wire connection of the wire electric discharge machine, The tip position of the sent wire is detected, and the wire reference state detecting means detects whether the sent wire is in a predetermined reference state or an abnormal wire connection state, and abnormal wire connection is detected. In the case of, the number of occurrences of the wire connection failure is determined to have occurred, and the wire connection failure occurrence count information is further stored in the wire connection failure occurrence count information storage means for each preset wire path section, and once or It is stored for each automatic connection operation for every plural times or for each average value of the automatic connection operations for every plural times. Then, the display contents based on the stored wire connection fault occurrence frequency information are displayed on the display device.

Further, as the display contents based on the wire connection failure occurrence frequency information, the number of wire connection failure occurrences in the wire path section is calculated by averaging the automatic connection operation every one or a plurality of times or the automatic connection operation every a plurality of times. By displaying by value, the history of abnormal state of wire connection is displayed.
The index of maintenance of the wire electric discharge machine is displayed by using the history of the wire electric discharge machine such as the contamination state and the deterioration state in the wire path section.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings, but the present invention is not limited to the embodiments.

FIG. 1 is a block diagram of an automatic wire connection control of a wire wire connection state display device of a wire electric discharge machine according to the present invention.

In FIG. 1, the wire electric discharge machine main body has a wire 1 stretched between upper and lower machine frame portions (not shown) which are arranged opposite to each other. The wire 1 is supplied from a wire winding unit (not shown) and wound up by a wire drawing unit (not shown) via a wire feeding mechanism 2.
A wire feed roller is provided between the wire winding unit and the wire feed mechanism 2, and the feed of the wire 1 is controlled by the brake 3 driven by the constant current circuit 4. An encoder 7 is attached to the wire feed roller and is used for detecting the rotation amount of the wire feed roller and measuring the wire movement amount for detecting the position of the wire connection failure and the wire disconnection failure.

Further, the wire drawing unit has a wire winding roller driven by the feed motor 5 supplied with a voltage from the constant voltage circuit 6, and winds the wire 1. The wire winding unit and the wire retracting unit form a wire tensioning unit.

The wire path of the wire electric discharge machine is divided into a plurality of sections along the path, and wires such as a wire breakage detection section, a wire passage detection section, and a wire deflection detection section are predetermined in each section. A wire abnormality detecting means is installed as a wire reference state detecting means for detecting whether or not it is in the reference state. The output of the wire abnormality detecting means is detected by the abnormality detecting circuit 10, and its output is connected to the bus 21 through the input / output circuit 20 (hereinafter referred to as DI / DO). Further, the DI / DO 20 is connected to the constant current circuit 4, the constant voltage circuit 6, and the encoder 7, and CP
The control signal is transmitted from U to the constant current circuit 4 and the constant voltage circuit 6, and the measurement signal is transmitted from the encoder 7 to the CPU.

In addition to the DI / DO 20, a CPU 30 of a programmable controller (hereinafter referred to as PMC), a CPU 40 of a numerical control device (hereinafter referred to as CNC), and a CRT display device 50 are connected to the bus 21. And CPU30 of PMC and C of CNC
The PU 40 has ROM 31, 41 and RAM 32, respectively.
42 is connected, and the CRT display device 50 is connected to a CRT input / output device (hereinafter referred to as CRT / MDI) 51. The CRT display device 50 is a display device that displays wire fault position information in various forms, and is a ROM 31.
The wire connection state is displayed on the CRT screen according to the display program stored in.

The ROM 31 is used as a program memory, and a program for displaying the wire connection state,
Various programs for controlling each part of the wire electric discharge machine and the wire electric discharge machine control device itself are stored. The RAM 32 is used as a data memory,
In addition to the position data attached to the machining program and various setting data that determines the other machining conditions, various data related to the wire connection status display (such as the conversion data table of the wire position and the coordinate data on the display screen) is stored. , Is used as a memory for temporarily storing data for various calculations performed by the CPU 30. It also has a register area for counting output pulses of the encoder 7 and a register area for storing failure occurrence position data.

Further, the ROM 41 is used as a program memory of a CNC device for controlling the position of the work table, and the RAM 42 is used as a data memory for storing position data and the like accompanying the machining program, or for various calculations performed by the CPU 40. Is used as a memory for temporarily storing data.

In FIG. 1, a CRT is used as a display device.
Although the display device 50 is shown, the display means is not limited to the CRT, and other display devices such as a liquid crystal display device can be used.

In the wire abnormality detecting means as the wire reference state detecting means, the wire breakage detecting section detects the wire breakage when the wire breakage occurs during machining. For example, a method of detecting a current flowing through the wire or winding. A method of detecting the tension of the take-up roll is known. The wire passage detection unit detects contact between the wire cutting electrode and the wire of the electrode that functions as a wire passage electrode, and can be detected by detecting a potential change of the electrode, for example.
Further, the wire flexure detection unit is for detecting a wire connection failure caused by the wire being caught at any part in the wire path in the process of feeding the wire at the time of wire flexion. The contact of the electrode with the wire can be known by detecting the voltage change.

Then, the wire electric discharge machine, when the wire is automatically connected in the wire electric discharge machine during execution of normal machining,
An encoder 7 which is a wire feeding amount detecting means detects the wire feeding amount fed from the wire feeding means to detect the tip position of the wire. Further, the wire abnormality detecting means such as the wire breakage detecting portion, the wire passage detecting portion, the wire bending detecting portion, etc. serves as wire reference state detecting means and determines whether or not the wire is in a predetermined reference state. When the wire connection status is detected and the wire connection status is abnormal, the number of occurrences is used as wire connection failure occurrence count information for each preset wire route section and once or multiple times automatically. An abnormal state position detection / recording process is performed, which is stored in the wire connection failure occurrence frequency information storage means for each connection operation or for each average value of automatic connection operations every several times. This abnormal state position detection / recording process is executed by the CPU 30.

In the embodiment of the present invention, when the automatic connection is executed, the screen shown in FIG.
Is displayed on the CRT screen. As shown in FIGS. 3 and 4, on the CRT screen of the CRT display device 50, the wire route of the wire electric discharge machine shown in FIG. 1 and this wire route are divided into some (here, 12). Sections 0 to 11 that have been set) are displayed. Also, the occurrence statuses of the connection failure and the disconnection failure are displayed together on the right side of the screen.

Each of the sections 0 to 11 is commonly applied to the section of the wire connection failure occurrence position and the section of the wire disconnection failure occurrence position. For example, the counting pulse counted by the encoder 7 is defined as P (n). Then, it is divided as shown below.

Section 0: Above P (0) Section 1; P (0) to P (1) Section 2; P (1) to P (2) Section 3; P (2) to P (3) Section 4 P (3) to P (4) section 5; P (4) to P (5) section 6; P (5) to P (6) section 7; P (6) to P (7) section 8; P (7) to P (8) Section 9; P (8) to P (9) Section 10; P (9) to P (10) Section 11; P (10) to P (11) Here, at each position , P (0) to P (11) are set as follows.

P (0); Feeding start position during connection (wire cutting electrode) P (1); Upper guide entrance position P (2); Machining upper electrode position P (3); Upper die position (upper guide exit) (Near) position P (4); work top surface position P (5); lower die position (near lower guide entrance) position P (6); lower machining electrode position P (7); turning roller (lower guide roller) wire turning Start position P (8); Turning roller (lower guide roller) Wire turning end position P (9); Guide pipe inlet position P (10); Feed part position P (11); Connection end detector position Boundary point of each section For P (1) to P (11), for example, distance data measured with P (0) as the origin is stored in the RAM 32 that is a data memory. Further, the positions of the upper guide and the work are generally variable, and the distance data at each position is fixed by the user inputting data on a processing condition setting screen (not shown). FIG. 2A shows the number of pulses representing this section.

The tip position itself of the wire is represented by a change in the display of the line representing the wire during the route display. In the illustrated example, sections 0 to 4 have already been passed (displayed by a solid line), and it is shown that the wire tip is currently located in section 5. In the section 6 and the subsequent sections, an unpassed display (dotted line) is displayed. It is obvious that various forms can be used for the identification display of the wire tip position, for example, the passed section is displayed in blue, the unpassed section is displayed in yellow, the section being passed is displayed in red with blinking, etc. It will be easier to visually grasp the connection state by displaying.

In such a wire tip position display, the count value of the register for counting the output pulses of the encoder 7 is converted into the path distance from the position P (0), and the converted value is from P (1) to P (1).
The section is compared with the distance setting data of P (11),
For the determined section, the display part is identified and displayed (red blinking, etc.). In that case,
Positioning is performed using coordinate value data on the display screen for each of the positions P (1) to P (11). This coordinate value data is stored in advance in the RAM 32 in the form of a data table in which concrete numerical values are written, and is read and displayed as appropriate during execution of the display program.

FIG. 2B is a diagram showing the data storage state of the memory for storing the data of the abnormal connection number of the embodiment, and for each section, each automatic connection operation or multiple automatic connection operations. By storing the number of abnormal connection times in the operation, the history of the abnormal connection times of the wire electric discharge machine can be stored (the storage of the data of the abnormal connection times in this memory will be described later). In the figure, the section is divided into 12 sections from section 0 to section 11, and in each section, the number of abnormal connection in each of the n automatic connection operations is A [0,0] to A [11, n]. Remembered

In addition, when the number of times of abnormal wire connection for each of a plurality of automatic wire connecting operations is used as data, or when the number of times of abnormal wire connection for each average value in a plurality of automatic wire connecting operations is used as data, another case is taken. This can be carried out by a method of accumulating data for each automatic connection operation in the memory, storing the integrated value, and outputting the integrated value or its average value.

FIG. 3 is a first display example. The left side of the screen of FIG. 3 displays the schematic configuration of the wire electric discharge machine, the wire path, and each section along the wire path by displaying the wire. In the right part of the screen of FIG. 3, the history of the abnormal wire connection frequency is used to display the history of the abnormal wire connection frequency of the wire electric discharge machine. The vertical columns of the table indicate the sections from section 0 to section 11, and the horizontal column shows the number of abnormal wirings for each automatic wiring operation, or for each of multiple automatic wiring operations, or the average of multiple automatic wiring operations. The change for each value is shown. The left side shows the new abnormal connection number and the right side shows the old abnormal connection number.

For example, in section 6, the number of abnormal connection is "2" times, "3" times from the oldest one for each automatic connection operation.
The history of the number of abnormal wirings can be known by indicating that the number of times was “4”, “6”, and “7”.

FIG. 4 is a second display example, which is a table showing the state of dirt and deterioration of the wire electric discharge machine, or the progress thereof, using the history data of the number of abnormal connections shown in FIG. This is an example, and a change in the number of abnormal connection in a certain section (section 6 in the figure) is graphically displayed on the right side of the screen. The left side of FIG. 4 shows the schematic configuration of the wire electric discharge machine and the state of the wire in each section, as in FIG.

The graph on the right side of FIG. 4 shows the criteria for cleaning and replacement at the same time as the change in the number of abnormal connection for each automatic connection operation once or a plurality of times, indicating the necessity of maintenance. be able to. For example, in the figure, the number of abnormal wire connections tends to increase each time the automatic wire connection operation is performed, and the latest number of abnormal wire connections indicates the criterion (one-dot chain line) indicating the necessity of cleaning and the necessity of replacement. It is between the standards (two-dot chain line). This indicates that the wire path needs to be cleaned and needs to be replaced soon. Although the graph shows the standard indicating cleaning, replacement, etc., the comparison standard shown in the graph is not limited to this, and it may be different according to the usage status of the wire electric discharge machine and the necessity of display. Criteria can be used. As the comparison reference for the number of abnormal connection, a plurality of values corresponding to the comparison reference are set in advance and stored in the RAM 32 or the like, and from among them, selected and read out by an instruction of the input / output device,
It can be displayed on a display device.

Also, the display section can be selected by the instruction of the input / output device to display an arbitrary section. Further, according to the comparison between this data and the comparison standard, the RAM 3
Various guidances can be displayed by reading the display contents stored in 2. In Fig. 4, a guidance display saying "6 sections are above the cleaning level, please clean." Is displayed.

As described above, the history data of the number of abnormal wire connections is used to display on the display screen various displays concerning the ratio of abnormal wire connections in each section of the wire electric discharge machine and the history of the number of abnormal wire connections for each automatic wire connection operation. The status of contamination, deterioration, or its progress in each section can be displayed and used as an index for maintenance of each mechanism.

Next, the flow of forming the history data of the abnormal wire connection number, which is the basis of the display, in the memory having the configuration shown in FIG. 2 will be described.

FIG. 5 is a flow chart for detecting abnormal connection during automatic connection and storing history data of the number of abnormal connection in the memory, and FIG. 6 is a flow chart for moving history data in FIG. FIG. 7 is a diagram for explaining the movement of data on the memory area. In the following description, the flowchart of FIG. 5 will be described using the reference numeral of step S, and the flowchart of FIG. 6 will be described using the reference numeral of step T.

First, the procedure for forming data in the memory area will be described with reference to FIG. In the memory of FIG. 7, for the (m + 1) sections from section 0 to section m, the data of the series of (n + 1) automatic connection operations from the automatic connection operation “0” to the automatic connection operation “n” are stored. It is assumed that a region to be formed is formed. Note that (n + 1)
A series of individual automatic wire connecting operations is divided by a predetermined number of automatic wire connecting operations that can be set arbitrarily.Each series can be set by one automatic wire connecting operation, or multiple times. It is also possible to set by the number of times of the automatic wire connecting operation, and when setting by the number of times of the automatic wire connecting operation, the average value of the number of times of the automatic wire connecting operation can be used as data. It should be noted that, here, this series will be represented by automatic connection operations "0" to "n". In FIG. 7, the automatic connection operation “0” is the newest data on the series, and the automatic connection operation “n” is the oldest data on the series.

First, in each section of the path of the wire electric discharge machine, the number of abnormal wire connections during one automatic wire connection operation or a plurality of automatic wire connection operations or the average value thereof is counted to obtain data on the first abnormal wire connection frequency. a ₀ to a seek _m, the data a ₀ to a _m from the interval 0 in the automatic connection operation of the memory "0" is stored in the area of the section m (FIG. 7 (a)). After that, during the next automatic connection operation or during the automatic connection operations of a plurality of times, the number of abnormal connection times or the average value thereof is counted again to obtain the second abnormal connection frequency data B _{0 to} B _m . To store the data B _{0 to} B _m of the second abnormal connection number in the area of the automatic connection operation “0” which is the latest data in the memory area, it is stored in the area of the automatic connection operation “0”. previous data a ₀ ~A _m
Need to be moved to the automatic wiring operation "1". Therefore,
Automatic wire connection operation data A ₀ to A _m stored in the area of automatic wire connection operation "0" as shown in (b) of FIG. 7, "1"
Move to and clear the area of the automatic connection operation "0" so that the next data can be input.

After the history data is moved, the second abnormal connection number data B _{0 to} B _{m is} displayed in the area of the automatic connection operation "0".
Is stored ((c) in FIG. 7). Further, data B ₀ .about.B _m data A ₀ to A _m and the second abnormality connection number of the first abnormality connection number is moved by respective one automatic wire connection operation fractionated on a series of automatic wire connection operation (Fig. 7 (D)),
During the next one automatic wire connecting operation or a plurality of automatic wire connecting operations, the number of abnormal wire connections or its average value is counted again to obtain the third abnormal wire connection count data C _{0 to} C _m. The data C _{0 to} C _m of the third abnormal connection number is stored in the area “0” ((e) of FIG. 7). Thereafter, similarly, movement of the history data ((f) of FIG. 7, (g) of FIG. 7) and the latest abnormal connection frequency data P _{0 to} P _m to the area of the automatic connection operation “0” are stored. By storing ((h) in FIG. 7), the history data can be updated in the memory.

Update of history data to the memory of FIG. 7 is shown by the flow charts of FIGS. 5 and 6.

To move the history data, in the flowchart of FIG. 6, first, the maximum number n is set to the index k indicating the sequence of the automatic wiring operation of the memory (step T1), and the maximum to the index j indicating the section of the memory. The number m is set (step T2). When the history data in the automatic wiring operation k in the section j is represented by A [j, k], the automatic wiring operation (k−
The history data A [j, k-1] in 1) is rewritten as history data A [j, k] in the automatic connection operation k (step T3). Now, automatic connection operation k
Is n and the memory section j is m, the history data A [m, n-1] is rewritten to the history data A [m, n]. Here, for the section j, the history data of step T3 is rewritten while sequentially decreasing the value of j by "1" until the value of j becomes negative (steps T4 and T5), thereby performing the automatic connection operation "n". The history data of all the sections from section 0 to section m in is rewritten. Next, regarding the automatic connection operation k, the history data of steps T2 to T5 is rewritten while sequentially decreasing the value of k by “1” until the value of k becomes “1” (steps T6 and T7). The history data of all the sections from the section 0 to the section m in the automatic connection operation "n" to the automatic connection operation "1" is rewritten.

By the steps T1 to T7, the movement of the history data in the area excluding the automatic connection operation "0" in the memory is completed.

Therefore, the following steps T8 to T
According to 12, the data in the area of the automatic connection operation "0" in the memory is set to "0". "0" is set to the index k of the sequence of the automatic wiring operation of the memory (step T8), and the maximum number m is set to the index j of the section of the memory (step T9). Since the automatic connection operation k is 0 and the memory section j is m by the settings of the steps T8 and T9, the history data A designated by this is A [m, 0].
Data "0" is written in the history data A [m, 0] (step T10). Next, the automatic connection is performed by writing the "0" data in step T10 while sequentially reducing the value of j by "1" until the value of j becomes "0" for the section j (steps T11 and T12). The history data of all the sections from the section 0 to the section m in the operation “0” can be rewritten to “0”.

Therefore, according to the above flow, the history data is moved as shown in (f) of FIG. 7 to (g) of FIG.

Next, the detection of abnormal connection during automatic connection will be described with reference to the flow chart of FIG. 5 in which abnormal connection during automatic connection is detected and the history data of the number of abnormal connection is stored in the memory. Step S1 is the movement of the history data according to the flowchart of FIG. 6, and when the movement of the history data in the memory is completed by this flow, the memory becomes the state of (g) of FIG. Steps S2 to S11 described below are steps of detecting abnormal connection during automatic connection and writing the detected data from section 0 to section m in the automatic connection operation "0" of the memory, and when writing is completed. The state of the memory shown in FIG. 7H is obtained.

After the history data is moved in step S1, the read value e of the encoder and the counter of the encoder 7 are first reset to return to the initial state (step S2). A wire feed command is output from the CPU 30 to the wire feed mechanism 2 and the wire 1 is fed (step S).
3). The movement amount of the wire 1 during the feeding operation of the wire 1 can be read by the value of the encoder 7, and the tip position of the wire 1 can be known from the read value e (step S4). When there is no abnormal connection, the abnormal connection state of the automatic connection of the wire electric discharge machine is detected by the abnormality detection signal of the abnormality detector installed in each section of the divided route of the wire electric discharge machine (step S5). Returns to step S3 again to further send out the wire 1. When the wire 1 is sent out, the reading e of the encoder 7 causes the pulse number P (1
It is performed until it becomes 1) (step S6).

In the abnormality detection of step S5, when an abnormal connection is detected by the generation of the abnormality detection signal of the abnormality detector installed in each section of the route, the abnormality in the area of the memory is detected from step S7 to step S10. Write the number of connections. In writing the number of abnormal wire connections, first, the index i of the section of the path is set to "0" and the number of pulses representing the tip position of the wire 1 is set to P (i) (step S7), and the encoder 7 reads it. Value e is the number of pulses P
It is determined whether it is between (-1) and the number of pulses P (0). The section defined by the number of pulses P (-1) and the number of pulses P (0) corresponds to the section 0, and the read value e of the encoder 7 is the number of pulses P (-1) and the number of pulses P (P).
If it is in (0), it indicates that the place where the abnormal connection occurs is section 0 (step S8). Here, the pulse number P (−1) is set to the pulse number 0.

The read value e of the encoder 7 in step S8, the pulse number P (i-1) and the pulse number P
The comparison with (i) is performed by increasing the number of i until the read value e falls within this pulse number (step S9).
When an abnormal connection occurrence section of the wire 1 is detected in the determination in step S8, the value obtained by adding "1" of the abnormal connection number to the history data A [i, 0] is added to the new history data A [i, 0].
0] to update the history data (step S10).
Then, the wire 1 is slightly returned (step S11) to eliminate the abnormal connection, and then the process returns to step S3 to continue the detection of the abnormal connection. This abnormal connection is detected in step S
6, the reading value e of the encoder 7 indicates the number of pulses P (1
It is performed until it becomes 1).

Based on the data of the number of abnormal connection obtained by the detection of the abnormal connection during the first automatic connection, as shown in FIG.
When the display as shown in FIG. 4 is performed, the data stored in the area of the automatic wire connection operation “0” is the latest data, and the data arranged in the old direction from the automatic wire connection operation is read out. Then, the data is taken out and desired processing for display is performed.

Next, detection of abnormal connection during the second automatic connection will be described with reference to FIGS. 8 and 9.

The detection of the abnormal connection at the time of the second automatic connection differs from the detection of the abnormal connection at the time of the first automatic connection in the method of moving the history data of FIG. 6, and is indicated by the one-dot chain line in FIG. The enclosed flow is the same as the abnormal connection detection at the first automatic connection. Therefore, the movement of the history data, which is different from the detection of the abnormal connection during the first automatic connection, will be described below.

First, the procedure for forming data in the memory area will be described with reference to FIG. In the memory of FIG. 9, for the (m + 1) sections from section 0 to section m, data of a series of (n + 1) automatic connection operations from the automatic connection operation “0” to the automatic connection operation “n” is stored. It is assumed that a region to be formed is formed. Note that this automatic wire connecting operation is one unit of each automatic wire connecting operation or a plurality of automatic wire connecting operations. A flag (FLG) is additionally provided in the memory, and the value of the flag indicates the position of the series of the automatic connection operation in which the data of the latest abnormal connection number is stored. For example, FLG
= 0 indicates that the latest abnormal connection count data is stored in the automatic connection operation “0”, and FLG = 1 indicates that the latest abnormal connection count data is stored in the automatic connection operation “1”. It indicates that Also, in this memory,
The data of the old abnormal connection count is stored in order from the automatic connection operation that stores the latest abnormal connection count data to the younger automatic connection operation in the left direction in the table that represents the memory area. The data of the abnormal connection number next to "0" becomes the data of the automatic connection operation "n" at the right end of the table, and the data of the oldest abnormal connection number becomes the data to the right of the latest abnormal connection number data. It should be noted that the series of (n + 1) automatic wire connecting operations can be set arbitrarily, and can be classified by, for example, one automatic wire connecting operation or a plurality of automatic wire connecting operations. Further, in the case of dividing a plurality of automatic wire connecting operations into one section, the average value of the number of times of the automatic wire connecting operations can be used as the data.

First, in each section in the path of the wire electric discharge machine, the number of abnormal wire connections during one automatic wire connection operation or a plurality of automatic wire connection operations or the average value thereof is counted to obtain the data of the first abnormal wire connection number. a ₀ to a seek _m, and stores the data a ₀ to a _m from the interval 0 of the automatic wire connection operation of the memory "0" in the area of the section m, FLG =
It is set to 0 ((a) of FIG. 9). During the next one-time automatic connection operation or a plurality of automatic connection operations, the number of abnormal connection times or its average value is counted again to obtain the second abnormal connection frequency data B _{0 to} B _m . The data B _{0 to} B _m of the second abnormal connection number are stored in the area of the automatic connection operation “1” of the memory, and FLG = 1 at the same time ((b) of FIG. 9). This FLG = 1 indicates that the latest abnormal connection data is stored in the area of the automatic connection operation “1” of the memory.

Furthermore, the average value of the number of abnormal wire connections is again counted during the next one automatic wire connection operation or a plurality of automatic wire connection operations, and the third abnormal wire connection number data C _{0 to} C _{m is obtained.}
And stores the data C _{0 to} C _m of the third abnormal connection number in the area of the automatic connection operation “2” of the memory and FL.
G = 2 ((c) of FIG. 9). Thereafter, the history data is written and the FLG value is set in the same manner. Then, in the automatic connection operation “n”, the data N ₀ to
After writing N _{m and} setting FLG = n ((d) of FIG. 9,
In the region of the next automatic wire connection operation again data O ₀ ~ O _m of abnormal connection number "0", the latest abnormal connection times by rewriting instead of the data A ₀ to A _m of abnormal connection number that has been written Data is written. At this time, the flag is set to FLG = 0 ((e) in FIG. 9).

Thereafter, in the same manner as in (b) of FIG. 9 and thereafter, by rewriting the data of the number of abnormal connection to the area of the next automatic connection operation and updating the numerical value of the flag ((f of FIG. 9). )), The history data is stored in the memory.

Next, the storage of history data in the memory of FIG. 9 will be described with reference to the flowchart of FIG. In the flowchart of FIG. 8, steps S2 to S1
The abnormal connection detection at the time of automatic connection shown by 1 (the portion surrounded by the one-dot chain line) is almost the same as the detection of the abnormal connection at the time of the first automatic connection shown in FIG.
The process shown in step U4 corresponds to the movement of data in the detection of the abnormal connection during the first automatic connection.

First, "0" is set to the exponent k indicating the time series of the memory (step U1), and the exponent k indicating the series of the automatic wiring operation of the memory is set to be equal to or less than the maximum possible value "n". After that (step U2), the value of FLG is set to the index k (step U3). by this,
The area of the memory in which the data of the abnormal connection number should be written is set. In the detection of the abnormal connection during the second automatic connection, the size of the automatic connection operation "k" in the series of the automatic connection operation of the memory does not indicate the order of the series of the automatic connection operation as it is, but the flag. The automatic connection operation indicated by the value of becomes the latest abnormal connection number data.

After this, the steps S2 to S
The same process as 11 is executed, and in step S6,
The abnormal connection is detected until the read value e of the encoder 7 reaches the pulse number P (11) indicating the end point of the final section of the path of the wire electric discharge machine, and the data is written in the memory area.

In FIG. 5, the history data is updated as new history data A [i, k] with a value obtained by adding "1" of the abnormal connection number to the history data A [i, k] in step S10. . The value of k, which is an index of this automatic wiring operation, is updated by increasing it in step U4, and by repeating the above process, data of the number of abnormal wirings from the automatic wiring operation "0" to the automatic wiring operation "n" is obtained. Writing is performed, and at the same time, the value of the flag is updated.

Writing of the next data after the writing of the data of the abnormal wiring number in the automatic wiring operation "n" is completed,
The operation is performed again by returning to the area of the first automatic connection operation "0". Therefore, the value of k updated in the step U is n
It is judged whether or not it is larger (step U3), and when the value of k is larger than n, the process returns to "0" (step U3).
1), the same processing as above is continued.

Based on the data of the number of abnormal connection obtained by detecting the abnormal connection during the second automatic connection, as shown in FIG.
When performing the display as shown in FIG. 4, the data in the automatic connection operation indicated by the flag is the latest data,
The data is obtained by reading the data arranged in the backward direction in that order from the data, and the desired processing is performed.

[0065]

As described above, according to the wire connection status display device of the present invention, the occurrence status of the connection failure of the wire electric discharge machine is recorded as the history of the number of connection failures by one or more automatic connection operations. Can be displayed on the display device.

[Brief description of drawings]

FIG. 1 is an automatic wire connection control block diagram of a wire wire connection state display device of a wire electric discharge machine of the present invention.

FIG. 2 is a diagram showing a data storage state of a memory that stores data on section divisions and abnormal connection counts.

FIG. 3 is a first display example of a wire connection state display device of the wire electric discharge machine of the present invention.

FIG. 4 is a second display example of the wire connection state display device of the wire electric discharge machine of the present invention.

FIG. 5 is a flowchart for detecting abnormal connection during automatic connection and storing history data of the number of abnormal connection in a memory according to the present invention.

FIG. 6 is a flowchart of moving history data according to the present invention.

FIG. 7 is a diagram for explaining movement of data on the memory area of the present invention.

FIG. 8 is another flowchart of detecting abnormal connection during automatic connection and storing history data of the number of abnormal connection in a memory according to the present invention.

FIG. 9 is another flowchart of moving history data according to the present invention.

FIG. 10 is a diagram showing a change in the number of abnormal wire connections depending on the number of automatic wire connection operations.

[Explanation of symbols]

 1 wire 2 wire feeding mechanism 7 encoder 10 abnormality detection circuit 30 CPU 31 ROM 32 RAM 50 CRT display device

Claims (3)

[Claims] 1. A wire feed amount detection means for detecting a wire feed amount by a wire feed means during automatic wire connection of a wire electric discharge machine, and a wire reference state detection means for detecting that a wire is in a predetermined reference state. And the wire connection fault occurrence count information for each preset wire path section, and for each automatic wiring operation once or multiple times, or by the average value in multiple automatic wiring operations, the number of wire connection failure occurrences An information storage means and a display device for displaying a display content based on the wire connection failure occurrence frequency information, and the wire connection based on the detection output of the wire feed amount detection means and the detection output of the wire reference state detection means The fault occurrence frequency information is obtained and stored in the wire connection fault occurrence frequency information storage means, and stored in the stored content. A wire connection state display device for a wire electric discharge machine, wherein display contents based on the display device are displayed on the display device. 2. The wire connection state display device of the wire electric discharge machine according to claim 1, wherein the display content is a history of the number of times of occurrence of wire connection failures in the wire path section. 3. The wire connection state display device of the wire electric discharge machine according to claim 1, wherein the display content is a history of the wire electric discharge machine such as a contamination state and a deterioration state in the wire path section.