KR101751756B1

KR101751756B1 - An elecrode setting method of CNC electric discharge machine

Info

Publication number: KR101751756B1
Application number: KR1020150058254A
Authority: KR
Inventors: 원장연
Original assignee: 원장연
Priority date: 2015-04-24
Filing date: 2015-04-24
Publication date: 2017-06-30
Also published as: KR20160126760A

Abstract

According to the method of setting the electrode of the CNC electric discharge machine according to the present invention, when the operator inputs the electrode dimension values of + X, -X, + Y, -Y and + Z, the electrode is automatically set to shorten the setting time And the horizontal error generated when fixing the electrode is displayed on the display unit so that the operator can confirm the discharge and perform the discharging operation, so that the defective processing can be prevented in advance during the discharge processing work As a result, the reliability of the product is improved.

Description

[0001] The present invention relates to an electrode setting method for an CNC electric discharge machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of setting an electrode of a CNC electric discharge machine, and more particularly, to a method of setting an electrode of a CNC electric discharge machine, The present invention relates to a method of setting an electrode of a CNC electric discharge machine.

Generally, electric dischage is performed by repeating pulsed discharge by applying a current to an electrode by putting a metal (workpiece) as a negative electrode (-) and a processing tool (electrode) as an anode (+ And the shape of the electrode is etched into the metal workpiece by using the high temperature and erosion of the surface of the workpiece.

On the other hand, the CNC electric discharge machine is a manual of a series of machining operations by a computer. This CNC electric discharge machining is advantageous in that the workpiece can be processed to a relatively good shape without being restricted by hardness, viscosity and the like if the workpiece has conductivity and can be processed without applying mechanical force to the electrode and workpiece have. In addition, unmanned operation is possible, the machined surface is uniform, and almost no machining is impossible. Due to these advantages, it is widely used for precision machining in metal mold, electronics, and nuclear industry.

Meanwhile, in order to perform the discharge machining work in the CNC electric discharge machine, it is necessary to perform a SETTING operation to match the CNC machine tool with the machining reference point of the electrode. In this setting operation, the workpiece WORK is set on the work table , A setting ball serving as the origin or reference point is set, and finally, the electrode (ELECTRODE) is set.

In the conventional method of setting the electrode, first, the electrode is fixed to the holder of the CNC machine tool, and the electrode is vertically and horizontally aligned using the horizontal and vertical adjustment screws of the holder. Then, after aligning the electrode with the setting ball position, manually set the coordinate values of X, Y and Z by touching the setting surface of the electrode to the setting ball by manually operating the X, Y and Z axes.

However, in the conventional electrode setting method, it is troublesome for the operator to manually move the chuck to which the electrode is fixed, and to set the coordinates by touching the X, Y, Z side of the electrode on the setting ball. This problem is time consuming, especially when the number of electrodes required is large.

In addition, it is necessary for the user to align the electrodes horizontally and vertically after bonding the electrodes to the holder, which requires extreme precision. In this step, errors may occur, especially errors in aligning horizontally occur frequently. However, even if the error can not be confirmed or the error can be confirmed, the worker can advance the discharge machining operation without correcting the error by mistake. In this case, there is a fatal problem that the machining is defective.

Korean Patent Publication No. 10-2006-0087104 (published on August 2, 2006)

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an electrode setting method of a CNC electric discharge machine capable of performing a discharge operation after confirming a horizontal error occurring when an electrode is automatically set and an electrode is fixed The purpose is to provide.

In order to accomplish the above object, a method of setting an electrode of a CNC electric discharge machine according to the present invention is a method of setting an electrode after a work (WORK) setting and a setting ball setting are completed in a CNC electric discharge machine a) receiving an electrode dimension value of + X, -X, + Y, -Y, + Z from an operator; b) receiving a selection of a predetermined STARTING POINT position from an operator; c) arranging the electrode at a predetermined starting point position around the setting ball, and then receiving a first START command from the operator; d) The width Xw of the electrode X, the width Yw of Y, the center Xc of X, and the center Yc of Y are calculated using the input electrode dimension values, Displaying; e) After confirming the values of the width (Xw), the width (Yw) of X, the center (Xc) of X and the center (Yc) of Y of the electrode displayed on the display unit, Receiving a CHECK command and a second execution (START) command; f) driving the electrodes so as to start with the predetermined position as a starting point, so that the setting balls touch both ends of both side walls of both side walls of the X side wall of the electrode and both ends of both side walls of the Y side wall, Measuring a width Xcord and a width Ycord of Y, setting X and Y axis coordinates using the measured Xcord and Ycord, and storing the measurement error values of Xw, Xcord, Yw, and Ycord; g) displaying the measurement error value stored in step f) on the display unit; h) receiving a second check (CHECK) command from the operator after the operator confirms the measurement error value displayed on the display unit; i) an operator inputs a third START command from the operator after manually moving the electrode to a safe position for the machining position movement; And j) moving the electrode to an actual machining position of the workpiece.

The method of setting an electrode of a CNC electric discharge machine according to the present invention may further include the steps of: f1) moving the electrode to an ENDING POINT at a predetermined fixed position; And f2) driving the electrode so as to start from the finishing point (ENDING POINT), measuring the Z-axis height by causing the setting ball to touch the setting surface of the electrode, and setting the Z-axis coordinate using the measured Z-axis height do.

According to a preferred embodiment of the present invention, the predetermined position in the steps b) and c) is a first position (start 1) in which the lower right corner of the electrode faces the northwest circumference of the setting ball, And the second position (start 2), which is a position at which the first and second guide plates face the northeastern circumference of the setting ball.

According to a preferred embodiment of the present invention, the method further comprises a step of receiving an interference surface selection from the operator after the step b), wherein when the interference surface selection is input from the operator, the Xcord and Ycord In the measurement, if there is an interference surface on any one of the side walls of the X side wall or the Y side wall, the Xcord and Ycord are measured by touching other side walls except for the interference surface.

According to a preferred embodiment of the present invention, when the measurement error value exceeds the previously stored tolerance range in step (e), it is preferable to display a warning on the display unit.

According to the present invention, the operator can set the electrode automatically only by inputting the electrode dimension values of + X, -X, + Y, -Y, and + Z, thereby reducing the setting time. In addition, since the horizontal error generated when fixing the electrode is displayed on the display unit, the operator can confirm the discharge and perform the discharging operation, thereby preventing the defective processing in the discharge machining operation in advance, thereby improving the reliability of the product .

1 is a flowchart of a method of setting an electrode of a CNC electric discharge machine according to an embodiment of the present invention,
FIG. 2 is a diagram showing calculation values of Xw, Yw, Xc and Yc according to input of a screen and a dimension value for guiding input of an electrode dimension value to a display unit,
3 is a screen for guiding the start position of the electrode (start 1 to start 2) and the interference plane (setting surface) selection input to the display unit,
Figs. 4 and 5 are diagrams illustrating the starting point position and the number of interference plane (setting plane) selection points in Fig. 3 and showing the movement path for the actual electrode to be touched on the setting ball.

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. Hereinafter, a method of setting an electrode of a CNC electric discharge machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The setting work must be done in the order of WORK setting, SETTING BALL, ELECTRODE setting before the discharge machining in CNC EDM machine.

The setting of the work (work) is to set the work (work) to the work table. The setting ball is set at a distance from the work or at the upper part of the work. The setting of the setting ball in place of the origin or the reference point is set. The work setting and the setting of the setting ball are well known in the art and are not a gist of the present invention, so a detailed description thereof will be omitted.

The CNC electric discharge machining apparatus mainly includes a CNC machine tool for performing a discharge machining operation according to data input conditions, a data input section for inputting machining conditions, a data storage section for storing machining conditions classified into detailed NC machining data, From the data storage unit, a display unit for displaying the machining condition data and the machining condition, and the like. Here, a button input or a touch input may be applied to the data input unit. The CNC machine tool basically consists of machine body, power supply, processing fluid supply device, servo mechanism, and processing tool.

A method of setting an electrode of a CNC electric discharge machine according to the present invention is a method of automatically setting an electrode and is performed by the control unit, which will be described in detail with reference to FIGS. 1A and 1B.

First, the data storage unit of the CNC electric discharge machine stores the serial numbers of the electrodes used for the machining operation and the sizes (dimension values) of the respective electrodes. The size of each of the electrodes is input by the operator in advance, Can be input by the processor.

The control unit can generate the electrode sheet file in which the electrode dimension value information is displayed based on the stored dimension value of each electrode, and outputs the electrode sheet sheet at the request of the operator (S111).

In preparation for the electrode setting, the operator first attaches the electrode to the holder and fixes it to the holder fixing device (chuck) of the CNC machine tool. Here, the adjusting screw of the holder is used to align the electrode vertically and horizontally S112).

When the setting program is started, the control unit displays a screen for guiding the input of the electrode dimension value to the display unit as shown in FIG. 2, and displays the X coordinate of the X axis of the electrode placed on the XY plane of the three- (Hereinafter, referred to as "-X") of the electrode, the Y coordinate (hereinafter, referred to as '+ Y') of the Y-axis of the electrode. ), A Y coordinate (hereinafter referred to as "-Y") of the other end of the Y-axis of the electrode, and an electrode dimension value of a Z coordinate (hereinafter, referred to as + Z) (S113). 2, the dimension values of the five electrodes 10 displayed on the electrode sheet are displayed on the corresponding electrode sheets in the + X, -X, + Y, -Y, and + Z input screens To input the corresponding dimension value.

Then, as shown in FIG. 3, a screen for guiding the selection of the STARTING POINT position of the electrode (or the setting ball) predetermined in the display unit and the input of the interference plane (setting plane) of the electrode is displayed, The starting point position and the interference plane selection of the electrode are received (S113a).

2 and 3 can be displayed on the same screen or can be displayed separately.

The user can select the start position (start 1 or start 2) of the electrode (or setting ball). According to the embodiment of the present invention, the predetermined starting point position around the setting ball may be a start 1 position where the lower right corner of the electrode 10 faces the northwest circle of the setting ball 20, Quot; start 2 ", which is a position where the lower left corner of the electrode 10 faces the northeastern circumference of the setting ball 20.

In addition, a setting ball model 70 for selecting an interference plane is displayed at the center of four sides of the electrode 10, so that when the user touches the setting ball model 50 of the side wall having the interference plane, Setting surface). When the electrode 10 is later touched to the setting ball, the setting ball is not touched on the corresponding surface. The interference surface indicates that the electrode has interference when machining the workpiece, which means that there is no setting surface.

Thereafter, the operator aligns the electrode at a predetermined starting point position around the setting ball selected in FIG. 3, and then inputs a first START command (S114). Here, the first execution button indicates the order in which the operator inputs a START command when performing the setting method according to the present invention, and thus the first execution command input means inputting the first execution command. Although not shown, a START input is displayed on the display unit screen and can be touch input, or a separate execution button may be provided.

Then, when a first START command is inputted from the operator at step S115, the control unit calculates the width Xw of the electrode 10, the width Yw of the electrode 10, the width Y of the electrode 10, The center Xc, and the center Yc of Y, and displays each value on the display unit (S116). As shown in FIG. 2, the width (Xw) of X and the width (Yw) of Y are the widths of the actual X and Y electrodes of the electrodes so that the operator can quickly and easily recognize the positions where the respective values are displayed on the display At the display position, the center Xc of X and the center Yc of Y are displayed inside the electrodes.

The operator calculates the width (Xw) of the X, the width (Yw) of Y, the center (Xc) of X and the center (Yc) of Y displayed on the display unit If the operator agrees with the command, the operator inputs the START command after inputting the CHECK command (S117). If the values do not match, the worker has made a mistake in inputting the dimension value, so the operator enters the RESET command and corrects the wrong value and restarts from the beginning.

Thereby, there is an advantage that the operator can prevent the mistake of inputting the dimension value.

When a second START command is received from the operator (S117), the controller drives the electrodes (i.e., drives the holders and chucks to which the electrodes are fixed) (Xcord, Ycord) of the actual electrode is measured by making the setting ball touch each side of the electrode according to the order (S118).

That is, by driving control of the control unit, the electrode starts at a starting point (START POINT) of any one of the aligned predetermined positions (start 1 to start 2), and the setting ball is connected to one side wall of X, (Xcord) and the Y-axis value (Ycord) are actually measured by touching both the side walls of the X and Y axes. If it is the principle to measure both Xcord and Ycord, or if there is an interference surface (setting surface), either Xcord or Ycord can be measured.

Since the setting ball has a sensor and the diameter value of the setting ball is stored in advance, at least one axis of the electrode is touched to the setting ball, so that the width of the electrode can be actually measured. On the other hand, in controlling the movement of the electrodes, the values of Xw and Yw are already stored and the diameter values of the setting balls are determined. Therefore, by programming them in advance using the distance and direction of the electrodes, So that it can be driven.

The control unit calculates a measurement error value of the measured actual X width Xcord, a calculated measurement error value of the calculated X width Xw, a measurement error value Y of the measured Y width Ycord and the calculated Y width Yw Is stored in the memory (S119).

4 and 5 show a movement path for the electrode 10 to be touched on the setting ball 20 at the start point STAR POINT of each of the predetermined positions start 1 to start 2, 5 shows a movement path when start 2 is the starting point. In FIGS. 4 and 5, the right drawing shows the movement path for the electrode to be touched to the setting ball, and the left drawing shows that the user has selected the interference surface (setting surface) in the display portion (see S113a).

4 and 5, the solid line 50 shown on one side or both sides of the electrode 10 shows the interference plane display. The side of the electrode having the interference plane 50 is not touching the setting ball 20 This interference surface 50 means that there is no setting surface since the electrode shows a surface with interference when the work is machined.

Therefore, the setting ball 200 in principle needs to touch both ends of both sides of the electrode 10 in order to measure the width Xcord of the actual X and the width Ycord of Y, Can be found.

On the other hand, if there is an interference surface 50, the value can be measured even if only one axis X or Y is touched. In this case, only the width (Xcord) or Y width (Ycord) of X that touches both axes is used as the reference data.

When the setting ball completes the touch of the necessary side of the electrode, the control moves the electrode to the ENDING POINT of the predetermined position spaced a predetermined distance (for example, + 10 mm) from the X side wall or the Y side wall, The actual measurement operation is completed.

After the actual measurement of the electrode is completed, the center of the actual measured width Xcord of the X and the width Ycord of the Y is set to the coordinates of the X and Y axes (S120).

In the Z axis measurement, the control unit drives the electrode to start from the finishing point (ENDING POINT) so that the setting ball 20 touches the setting surface of the electrode 10 The actual height of the Z-axis is measured and set to the Z-axis coordinates using the measured actual height (S121). Here, the setting surface of the electrode means a protruding surface formed at the upper end of the electrode and coupled to the holder, and this setting surface serves as a reference surface for measuring the electrode height.

When the coordinate setting of the X, Y, and Z axes is completed, the controller reads the stored measurement error value, that is, the measurement error value of the measured actual X width (Xcord), the calculated X width (Xw) And a measured error value of the calculated Y width Yw are displayed on the display unit. According to the embodiment of the present invention, it is displayed again at the positions of Xw and Yw in Fig. 2, but it is not necessarily limited to this. On the other hand, if there is an interference plane (setting plane) selection, only Xcord or Ycord of other axes other than the corresponding axis is displayed.

The operator confirms and determines the measurement error value displayed on the display unit and inputs a second check command (i.e., a second confirmation command) if the error is within the tolerance (S125). If the error value exceeds the allowable error, the possibility of defective product increases when the actual machining operation is performed, so the operator must perform the horizontal alignment operation again.

According to another aspect of the present invention, the control unit can check and determine the error value (S123). In other words, when the error value exceeds the tolerance, the control unit displays an alarm on the display unit, (Step S124). Further, even if the error value exceeds the tolerance, the operator ignores the error and does not recognize the second check (CHECK) command or the third execution (START) command to be described later so as not to execute the next command can do.

Therefore, the operator can check the error value again before the discharge machining operation, and it is possible to prevent the operator from checking the error or proceeding the discharge machining operation without correcting the error by mistake even if checking the error There is an advantage. If the number of electrodes required for the discharge machining operation is large, the operator is likely to miss such an error checking job.

Thereafter, the operator manually moves the electrode to the safe position for movement of the Z-axis (S126), and then the operator inputs a third START command (i.e., a third execution command) (S127).

When a third START command is inputted from the operator in step S127, the controller moves the electrode to the actual machining position of the work in the X and Y axes, thereby terminating the electrode setting operation in step S128. The electrode is then subjected to electrical discharge machining in accordance with the NC data.

As described above, according to the present invention, the operator can set the electrode automatically only by inputting the electrode dimension values of + X, -X, + Y, -Y, and + Z, thereby reducing the setting time. In addition, by setting the both ends of both sides of the electrode to determine the error, it is possible to perform the discharging operation after confirming the horizontal error which occurs when the electrode is fixed to the holder, so that the defective processing can be prevented in advance As a result, the reliability of the product is improved.

Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that numerous modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims. And equivalents should also be considered to be within the scope of the present invention.

10. Electrode 20. Setting Ball
50. The interference surface of the electrode

Claims

And a method of setting an electrode after completing a work setting and a setting ball setting in a CNC electric discharge machine,
a) An electrode dimension value input guide screen is displayed on the display unit to display an X-coordinate (+ X) of one end of the X-axis of the electrode placed on the XY plane of the three-dimensional space from the operator and an X- (+ Y) on the Y axis of the electrode, a Y coordinate (-Y) on the other end of the Y axis of the electrode, and a Z coordinate (+ Z) Receiving,
The electrode dimension value input guide screen display shows the electrode shape on the display unit, the + X input screen is on the X axis of the electrode, the -X input screen is on the other side of the X axis of the electrode, Axis input screen is displayed at the other end of the Y-axis and the + Z input screen is displayed at the upper end of the Z-axis of the electrode, respectively;
(b) displaying a starting point position guidance screen of the setting ball on the display unit and receiving a touch input of a predetermined STARTING POINT position from the operator,
Wherein a setting ball shape of the setting ball is displayed around the electrode shape displayed on the display unit, and a predetermined starting point position of the setting ball is set such that a lower right corner of the electrode faces the northwest circle of the setting ball Or a second position (start 2), in which the lower left corner of the electrode faces the northeastern circumference of the setting ball;
c) arranging the electrode at a predetermined starting point position around the setting ball, and then receiving a first START command from the operator;
d) The width Xw of the X-axis, the width Yw of the Y-axis, the center Xc of the X-axis, and the center Yc of the Y-axis are automatically calculated using the input electrode dimension values, And displaying the result of the step
The X-axis width Xw and the Y-axis width Yw are displayed on the outside of the electrode so as to correspond to the positions indicating the actual X and Y widths of the electrodes displayed on the display unit, Causing a value of the center Yc of the axis to be displayed inside the electrode;
e) After confirming the values of the width (Xw), the width (Yw) of X, the center (Xc) of X and the center (Yc) of Y of the electrode displayed on the display unit, Receiving a CHECK command and a second execution (START) command;
f) driving the electrodes so as to start with the predetermined starting point as a starting point, so that the setting balls touch both ends of both side walls of both side walls of the X-axis side wall of the electrode and both side walls of the Y- Measuring a width Xcord of the X-axis of the actual electrode and a width Ycord of the Y-axis, setting the X-axis and Y-axis coordinates using the measured Xcord and Ycord, and storing the measurement error values of Xw, Xcord, Yw, and Ycord;
g) displaying a measurement error value stored in the step f) on the display unit, and displaying a warning on the display unit if the measurement error value exceeds a previously stored tolerance range;
h) receiving a second check (CHECK) command from the operator after the operator confirms the measurement error value displayed on the display unit;
i) an operator inputs a third START command from the operator after manually moving the electrode to a safe position for the machining position movement; And
j) moving said electrode to an actual machining position of said workpiece,
Further comprising the step of receiving an interference plane selection from an operator by performing an interference plane selection guide display on the display unit after the step b)
In the case of receiving the interference plane selection from the operator, in the measurement of Xcord and Ycord in step f), if there is an interference plane on any one of the side walls of the X side wall or the Y side wall, touch the other side wall except for the interference plane And the Xcord and Ycord are measured.

The method according to claim 1, wherein, after the step (f)
f1) moving the electrode to a predetermined ending point; And
f2) driving the electrode to start from the finishing point (ENDING POINT), measuring the Z-axis height by causing the setting ball to touch the setting surface of the electrode, and setting the Z-axis coordinate using the measured Z-axis height Wherein the CNC electric discharge machining apparatus comprises:

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