KR101810297B1 - Wire electric discharge machine having corner shape correcting function - Google Patents

Wire electric discharge machine having corner shape correcting function Download PDF

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KR101810297B1
KR101810297B1 KR1020150161647A KR20150161647A KR101810297B1 KR 101810297 B1 KR101810297 B1 KR 101810297B1 KR 1020150161647 A KR1020150161647 A KR 1020150161647A KR 20150161647 A KR20150161647 A KR 20150161647A KR 101810297 B1 KR101810297 B1 KR 101810297B1
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correction amount
wire
workpiece
work
guide
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KR1020150161647A
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Korean (ko)
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KR20160059977A (en
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야스오 하세가와
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화낙 코퍼레이션
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H11/00—Auxiliary apparatus or details, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting
    • B23H7/06—Control of the travel curve of the relative movement between electrode and workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/404—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)

Abstract

The wire electric discharge machine has a function of independently correcting the corner shape on the upper and lower surfaces of the work. On the upper and lower surfaces of the work, on the basis of the positions of the upper and lower wire guides and the position and thickness of the work, The amount of shape correction in a state in which the distance between the upper nozzle and the upper surface of the work and between the lower nozzle and the workpiece is empty is calculated from the amount of correction when the nozzles of the guide are in close contact with the upper and lower surfaces of the work, The shape correction is performed.

Description

TECHNICAL FIELD [0001] The present invention relates to a wire electric discharge machining apparatus having a corner shape correcting function,

More particularly, the position of the upper and lower wire guides in the relative movement command of the wire guide and the work commanded in the machining program is corrected independently by the phase guide portion and the lower guide portion, The present invention relates to a wire electric discharge machine capable of reducing a shape error caused by bending of a wire electrode on an upper and lower surfaces and improving the shape accuracy of a work.

In the wire electric discharge machining, it is known that the wire electrode is bent in a direction opposite to the machining direction or at a certain angle with the machining direction due to the discharge repelling force generated between the wire electrode and the workpiece, turbulence of the machining fluid, or the like. When a workpiece is linearly processed by the wire electrode, the wire electrode causes warp in the direction opposite to the processing advancing direction, but the warp of the wire electrode does not affect the machining shape. However, in the machining of the corner portion to be machined at the predetermined angle set in the machining program, the influence of the warpage of the wire electrode becomes large and the shape accuracy of the corner portion is largely lowered to cause so-called " corner deflection & The processed shape is not obtained.

18 is a view for explaining the machining of the corner portion. In order to process the workpiece 3 to a desired dimension in the wire electric discharge machining, an offset path is created by adding the radius of the wire electrode 4 and the discharge gap to the dimension of the actual product shape, It is common to move the wire electrode 4 along the machining path 5). A value obtained by adding the radius of the wire electrode 4 and the discharge gap is referred to as an offset value.

18, the wire electrode 4 does not move along the machining path 5 at the corner portion of the workpiece 3 but moves inside the machining path (the locus 6a of the wire electrode shown by the broken line) As a result, the work 3 is excessively processed. Therefore, a so-called " corner deflection " (refer to the corner deflection 7 caused by the deflection of the wire electrode) is formed, and a desired finished shape is not obtained. Various countermeasures have been proposed to cope with such a problem.

Japanese Patent Laid-Open Publication No. 58-120428, Japanese Unexamined Patent Application, First Publication No. H8-39356, and Japanese Unexamined Patent Application, First Publication No. Hei 7-24645 disclose a method of reducing the deflection of the wire electrode by reducing the processing energy when the wire electrode passes through the corner portion And then passing through the corner portion to improve the defective shape due to corner deflection.

In this machining method, the machining energy is reduced until the warpage of the wire electrode is reduced, that is, the machining speed is lowered, and the corner portion is slowly machined over time.

Japanese Patent Application Laid-Open Nos. 8-39356, 7-24645, 11-221719, and 2013-190854 disclose that when a wire electrode passes through a corner portion, It is disclosed that the bending amount of the wire electrode is corrected from the machining path to give a so-called excessively advanced path to return, thereby correcting the shape error due to the bending of the wire electrode. In this machining method, since the deceleration as described above is not performed, the machining time does not become extremely long.

The wire electrode 4 is moved along the wire electrode trace 6b when the wire 5 is machined by correcting the machining path 5 of the wire electrode 4 by the correction path 8 as shown in Fig. do. As a result, it is possible to avoid overworking the work 3.

20 is a flowchart of a process for calculating and outputting a correction path based on the distance between the upper and lower wire guides according to the related art. In this process, correction is not performed independently of the upper and lower wire guides.

The information of the thickness of the work and the position of the upper wire guide and the position of the lower wire guide in a state in which the upper and lower nozzles are in close contact with the work are acquired (step SA01), and the upper and lower nozzles The correction amount C is calculated by the deflection amount E of the wire electrode and the actual correction amount C is calculated from the calculated correction amount C and the angle information of the corner portion (step SA03) The correction path is calculated based on the calculated actual correction amount C (step SA04), the calculated correction path is outputted (step SA05), and the process is terminated.

Japanese Patent Laid-Open Publication No. Hei 7-24645 and Japanese Unexamined Patent Application Publication No. 11-221719 both support the wire electrode and also have a relative positional relationship between the position of the lower wire guide and the upper and lower surfaces of the work The gap between the position and the upper surface of the work and the gap between the lower guide position and the lower surface of the work are substantially equal and the upper and lower nozzles for discharging the working liquid are in close contact with the upper and lower surfaces of the work, The wire warping amount is assumed to be approximately the same, and the correction amount of the shape correction is also assumed to be the same on the upper and lower surfaces of the work, that is, the shape correction is performed by the XY axis of the two-dimensional plane.

However, in the processing by the wire electric discharge machine, not only the work in which the guide portion and the nozzle are in close contact with the upper and lower surfaces of the work, but also the lower surface of the work is fixed (fixed to the fixed table) The upper surface may be largely separated from the upper surface of the work due to the fixing jig or other reasons.

In the case where the phase guide supporting the wire electrode is largely separated from the upper surface of the work and the lower guide portion supporting the wire electrode is in close contact with the lower surface of the workpiece, the shape correction amount in the corner portion is the correction amount However, since the warp caused by the vibration of the wire electrode becomes larger on the upper surface of the work, correction of the upper surface of the work is not properly performed even if the shape of the lower surface of the work is corrected. There is a problem that it becomes insufficient.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an apparatus and a method for correcting a processing shape error of a work caused by warping of a wire electrode on the upper and lower surfaces of a work, And to improve the shape accuracy at the corner of the upper and lower surfaces of the workpiece.

The wire electric discharge machine according to the present invention is characterized in that a wire electrode is extended to upper and lower wire guides and the wire electrode and workpiece are moved relative to each other based on a machining program to perform electric discharge machining.

The first aspect of the wire electric discharge machining apparatus according to the present invention is characterized in that the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the workpiece upper and lower surfaces of the upper and lower wire guides and the workpiece thickness, And a correction amount for correcting the deviation amount of the actual machining position in the upper and lower portions of the workpiece due to the wire bending at the time of machining are stored in the reference position storage section A setting section for setting a relative position in a workpiece thickness direction of the upper and lower wire guides relative to the upper and lower workpieces at arbitrary upper and lower wire guide positions and a thickness of the workpiece; Based on the position and the amount of correction stored in the correction amount storage unit, A correction amount calculating section for calculating a correction amount for correcting each deviation amount in the relative position in the work thickness direction with respect to the work upper and lower surfaces of the upper and lower wire guides and the thickness of the work; And a wire guide position correcting section that corrects the position of the upper and lower wire guides in the relative movement command of the work independently of the phase guide section and the lower guide section based on the correction amount calculated by the correction amount calculating section.

A second aspect of the wire electric discharge machining apparatus according to the present invention is a wire electric discharge machining apparatus comprising a reference position storage section in which a plurality of pairs of a relative position in a workpiece thickness direction and a workpiece thickness with respect to a workpiece upper and lower surfaces of a workpiece, A correction amount storage section for storing a correction amount for correcting the deviation of the actual machining position on the upper and lower surfaces of the workpiece due to the wire bending at the time of machining; A setting section for setting the relative positions of the upper and lower wire guides in the work thickness direction and the thickness of the work with respect to the upper and lower workpieces in the guide position, From the set of the relative position in the thickness direction and the thickness of the work, A plurality of reference positions in a plurality of sets selected by the selection unit and a plurality of reference positions in a plurality of sets selected by the selection unit; Calculating a correction amount for correcting each deviation amount in the thickness of the work relative position in the work thickness direction with respect to the work upper and lower surfaces of the upper and lower wire guides set by the setting section Based on a correction amount calculated by the correction amount calculating unit, a position of the upper and lower wire guides in a relative movement command of the wire guide and the work commanded in the machining program, Independently, a wire guide position correcting section for correcting.

A third aspect of the wire electric discharge machine according to the present invention is a wire electric discharge machining apparatus comprising a reference position storage section for storing a plurality of relative positions of a workpiece in a thickness direction and a thickness of a workpiece relative to an upper and lower surfaces of a workpiece, A correction amount storage section for storing a correction amount for correcting the deviation of the actual machining position in the upper and lower portions of the workpiece due to the wire bending at the time of machining, A setting section for setting a relative position of the upper and lower wire guides in the work thickness direction with respect to the work upper and lower surfaces at the upper and lower wire guide positions and a thickness of the work; From the correction amount stored in the storage section, the work upper surface of the upper and lower wire guides set by the setting section A correction amount calling section for calling a correction amount for correcting each deviation amount in the relative position in the workpiece thickness direction and the thickness of the workpiece; And a wire guide position correcting section for correcting the position of the wire guide independently of the phase guide section and the lower guide section on the basis of the correction amount called by the correction amount calling section.

A fourth aspect of the wire electric discharge machining apparatus according to the present invention is a wire electric discharge machining apparatus according to the fourth aspect of the present invention wherein the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the workpiece upper and lower surfaces of the upper and lower wire guides, And a deviation amount storage unit for storing a deviation amount of an actual machining position in a workpiece top face due to wire bending at the time of machining, A relative position in the workpiece thickness direction of the upper and lower wire guides relative to the workpiece upper surface at any upper and lower wire guide positions and a relative position between the upper and lower wire guides in the workpiece thickness direction, A reference position stored in the reference position storage unit, A correction amount for correcting each deviation amount in the relative position in the work thickness direction with respect to the work upper and lower surfaces of the upper and lower wire guides and the workpiece thickness set by the setting unit is calculated based on the correction amount calculated by the output unit Based on the correction amount calculated by the correction amount calculating unit, the position of the upper and lower wire guides in the relative movement command of the wire guide and the work commanded in the machining program, Independently, a wire guide position correcting section for correcting.

A fifth aspect of the wire electric discharge machining apparatus according to the present invention is a wire electric discharge machining apparatus comprising a reference position storage section for storing a plurality of relative positions of a workpiece in a thickness direction and a thickness of a workpiece relative to an upper and lower surfaces of a workpiece, A deviation amount storage section for storing a deviation amount of a wire guide coordinate position on a machining program path at the plurality of reference positions and an actual machining position in a workpiece top face due to wire bending at the time of machining; A setting unit for setting the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower workpieces at any upper and lower wire guide positions and the thickness of the workpiece; The relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece, A selection section for selecting a plurality of sets which are set by the setting section and which are close to the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece and the thickness of the workpiece, Based on a reference position in a plurality of sets of the plurality of sets selected by the setting unit and a correction amount stored in the correction amount storage unit, A correction amount calculation unit for calculating a correction amount for correcting each deviation amount in thickness of the wire guide and the workpiece, and a correction amount calculation unit for calculating a position of the upper and lower wire guides in the relative movement command of the wire guide and the work, On the basis of the calculated correction amount, independently of the phase guide portion and the lower guide portion, Position correction unit.

A sixth aspect of the wire electric discharge machining apparatus according to the present invention is a wire electric discharge machining apparatus comprising a reference position storage section for storing a plurality of relative positions in a thickness direction of a work with respect to an upper and lower surfaces of a work, A deviation amount storage section for storing a deviation amount of a wire guide coordinate position on a machining program path at the plurality of reference positions and an actual machining position in a workpiece top face due to wire bending at the time of machining; A setting unit for setting the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower workpieces at any upper and lower wire guide positions and the thickness of the workpiece; From the plurality of reference positions stored in the reference position storage section and the correction amount calculated by the correction amount calculating section, A correction amount calling section for calling a correction amount for correcting each deviation amount in the relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the workpiece upper and lower surfaces and the thickness of the workpiece set by the setting section; The position of the upper and lower wire guides in the relative movement command of the commanded wire guide and the workpiece is corrected based on the correction amount called by the correction amount calling unit independently of the phase guide portion and the lower guide portion, .

The reference position storing section may store the reference position of the upper and lower wire guides relative to the position of the upper and lower wire guides and the position of the upper and lower wire guides relative to the upper and lower wire guides A plurality of sets of relative positions in the work thickness direction can be stored.

According to the present invention, by correcting the positions of the upper and lower guides for guiding the wire electrode independently of the upper and lower surfaces of the workpiece from the program path, the machining shape error of the workpiece caused by the deflection of the wire electrode on the upper and lower surfaces of the workpiece It is possible to provide a wire electric discharge machine capable of improving the shape accuracy of the work at the corner of the upper and lower surfaces of the work.

The above and other objects and features of the present invention will become apparent from the following description of the embodiments with reference to the accompanying drawings. In their drawings:
1 is a schematic configuration diagram of a wire electric discharge machine.
Fig. 2 is a view for explaining an example in which the upper nozzle portion is brought into close contact with the upper surface of the work, and the lower nozzle portion is in close contact with the work surface, and the error due to the warping of the wire electrode is not corrected.
Fig. 3 is a table for changing the thickness of a work, comparing the work thickness with a relative position in the work thickness direction with respect to the upper surface of the work and a relative position in the work thickness direction with respect to the lower surface of the work, Fig.
Fig. 4 is a view for explaining an example of correcting an error due to warping of the wire electrode when the upper nozzle portion is brought into close contact with the upper surface of the work and the lower nozzle portion is brought into close contact with the work surface.
Fig. 5 is a view for explaining an example in which the upper nozzle portion is separated from the upper surface of the work, and the lower nozzle portion is brought into close contact with the work surface, and the error due to the warping of the wire electrode is not corrected.
6 is a view for explaining an example of correcting an error due to warpage of the wire electrode when the upper nozzle portion is separated from the upper surface of the work and the lower nozzle portion is brought into close contact with the work surface.
7 is a view for explaining the amount of displacement of the wire electrode by the work position.
8 is a view for explaining an example in which the upper nozzle portion is separated from the work upper surface and the lower nozzle portion is separated from the work lower surface and the error due to the warping of the wire electrode is not corrected.
9 is a view for explaining an example in which the upper nozzle portion is separated from the upper surface of the work and the lower nozzle portion is separated from the work lower surface and the error due to the warping of the wire electrode is corrected.
10 is a diagram showing the amount of correction at the time of upper opening when the upper nozzle portion is separated from the upper surface of the work.
Fig. 11 is a graph showing Fig. 10. Fig.
12 is a block diagram of a main part of a wire electric discharge machine.
Fig. 13 is a flowchart showing the processing in the case where correction is performed independently in the up-and-down guide by the distance between the upper and lower guides.
14 is a diagram for explaining how a plurality of pairs of upper and lower wire guides relative to the upper and lower wire guides in the workpiece thickness direction with respect to the workpiece upper surface and workpiece thickness are stored as reference positions and a correction amount at the reference position is stored.
15 is a block diagram for explaining a first example of a control device for controlling a main body of a wire electric discharge machine according to the present invention.
16 is a block diagram for explaining a second example of the control device for controlling the main body of the wire electric discharge machine according to the present invention.
17 is a block diagram for explaining a third example of the control device for controlling the main body of the wire electric discharge machine according to the present invention.
18 is a view for explaining machining of the corner portion.
19 is a view for explaining a method of correcting the machining path in order to avoid excessive machining of the work due to warping of the wire electrode.
Fig. 20 is a flowchart showing a process in the case where correction is not performed independently in the up-and-down guide by the distance between the upper and lower guides.

1 is a schematic configuration diagram of a wire electric discharge machine.

The wire electric discharge machine 70 carries out processing of the work 3 by generating a discharge between the wire electrode 4 and the work 3 as a workpiece placed on the table 2. The wire electric discharge machine 70 has an X-axis saddle 19 that moves in the X-axis direction by a ball screw 31 driven by an X-axis motor 26 on a base 20 And a Y-axis saddle 18 that moves in the Y-axis direction by a ball screw 30 driven by a Y-axis motor 25 on the X-axis saddle 19. The Y- On the Y-axis saddle 18, a processing tank 14 having a table 2 on which a workpiece 3 is placed is fixed.

The column 21 is formed perpendicular to the base 20. The lower arm (42) is horizontally mounted on the side surface of the column (21). A lower nozzle 10 and a lower wire guide 13b are attached to the tip of the lower arm 42. [ The lower nozzle (10) and the lower wire guide (13b) are located below the table (2). Column 21 is provided with V-axis saddles 15 thereon. The V-axis saddle 15 is moved in the V-axis direction by the ball screw 34 driven by the V-axis motor 29. The V-axis direction is the same as the Y-axis direction. The V-axis saddle 15 is also equipped with a U-axis table 16. The U-axis table 16 is moved in the U-axis direction by the ball screw 33 driven by the U-axis motor 28. The U-axis direction is the same as the X-axis direction.

On the U-shaft table 16, an ivory arm supporting member 17 is mounted. The ivory arm supporting member 17 is moved in the Z-axis direction by the ball screw 32 driven by the Z-axis motor 27. The ivory arm 41 is fixed to the ivory arm support member 17. An upper nozzle 9 and an upper wire guide 13a are attached to the end of the ivory arm 41. [ The Y-axis motor 25, the X-axis motor 26, the Z-axis motor 27, the U-axis motor 28 and the V-axis motor 29 are connected to the control device 50 and the power / 36, 37, 38, and 39. Each of the motors is supplied with electric power from a control device 50 having an amplifier (not shown), and receives various signals from the control device 50 Transfer) is carried out. 1, the X axis and the U axis are directions perpendicular to the paper, the Y axis and V axis are the left and right directions of the paper, and the Z axis is the up and down direction of the paper.

The processing bath 14 is mounted on the Y-axis saddle 18. [ And a table 2 is disposed in the tank of the processing tank 14. [ The work 3 is fixed to the table 2. The electric discharge machining is performed in a state where the machining liquid 11 is stored in the machining tank 14. The upper nozzle 9 ejects the machining liquid 11 onto the work 3. The lower nozzle 10 ejects the processing liquid to the lower portion of the work 3. The upper wire guide 13a in the upper nozzle 9 supports the wire electrode 4 at the upper portion of the work 3 and the lower wire guide 13b in the lower nozzle 10 supports the wire 3 at the lower portion of the work 3. [ Thereby supporting the electrode 4.

The wire electric discharge machining apparatus 70 discharges electricity between the wire electrode 4 and the workpiece 3 through the machining fluid 11. The wire electric discharge machine 70 is provided with a machining fluid pump 43 for pouring the machining fluid 11 from a storage tank (not shown) for storing the machining fluid 11, The processing liquid 11 is ejected from the upper nozzle 9 and the lower nozzle 10 to the machining portion at a high pressure via the pipe 23, Wire discharge machining is carried out while discharging machining residue 12 in the machining groove 12 with the machining fluid 11 ejected.

The processing liquid pump 43 is connected to a control device 50 having an amplifier (not shown) by a power / signal line 40, and is driven and controlled by the control device 50. [ Power is supplied from the control device 50 to the machining liquid pump 43 and the signal is transmitted between the control device 50 and the machining liquid pump 43. [ The machining fluid pump 43 supplies the machining fluid 11 to the upper nozzle 9 via the branch conduit 22 and the conduit 23 and also supplies the machining fluid 11 through the branch conduit 22 and the conduit 24, So that the machining liquid 11 is supplied to the lower nozzle 10. The machining liquid 11 is sprayed from the upper nozzle 9 and the lower nozzle 10 to the machining portion during the discharge machining.

The control device 50 is a device for controlling the wire electric discharge machine as a whole and includes an arithmetic device, a display device, an input / output interface for various signals, and an amplifier (not shown) and also includes a storage device 51 . In Fig. 1, an arithmetic and logic unit (not shown), a display device, an input / output interface for various signals, and an amplifier are collectively shown as an arithmetic processing unit 52.

The wire electrode 4 is bent in the direction opposite to the relative moving direction of the wire electrode 4 with respect to the workpiece 3 by the working fluid pressure and the discharge repelling force during the electric discharge machining (see FIG. 2). It is known that the deformation caused by the bending of the wire electrode 4 has the same shape as the vibration of the string due to the working experiment and the shape thereof is equivalent to the displacement of the beam subjected to the uniformly distributed load at both ends. Fig. 7 is a view for explaining the amount of displacement of the wire electrode 4 by the position of the wire electrode 4. Fig. The deflection amount x of the wire electrode 4 at the arbitrary height z can be calculated by the following equation (1).

x = F / 2 / T x z x (L - z). . . . . .(One)

Here, F is the distribution load, T is the tensile force of the wire electrode 4, and L is the position in the z direction of the upper wire guide with reference to the lower wire guide position.

A necessary path correction amount is obtained from the amount of deflection x calculated by the above-mentioned expression (1). In other words, by substituting values into the respective variables of the equation (1), the amount of displacement (amount of deflection x) of each workpiece is calculated by the workpiece surface. Based on the obtained amount of displacement, the positioning command of the phase guide and the bottom guide is corrected. The distribution load is affected by the discharge repulsive force generated by the discharge, the hydraulic pressure, and the water flow.

The wire electric discharge machining apparatus 70 has a function of independently correcting the corner shape on the upper surface 3a and the lower surface 3b of the work 3. The wire electric discharge machining apparatus 70 is configured to perform a wire electric discharge machining on the basis of the positions of the upper and lower wire guides 13a and 13b and the thickness of the work 3 and the position of the work on the upper and lower surfaces 3a and 3b of the work 3 (Upper nozzle 9 and lower nozzle 10) of the upper and lower wire guides 13a and 13b are in close contact with the upper and lower surfaces of the work 3, The shape correction amount in the so-called open state in which the upper surface 3a of the workpiece 10 and the lower surface 3b of the workpiece 3 are empty is calculated and the shape correction is performed by the calculated shape correction amount.

≪ 1 > When the tip of the nozzle and the surface of the work are in close contact with each other,

2 shows a case where the upper nozzle portion (upper nozzle 9) is brought into close contact with the upper surface of the work 3 and the lower nozzle portion (lower nozzle 10) (4) is not corrected. In the state shown in Fig. 2, the upper and lower nozzles 9 and 10 are in close proximity to the upper and lower surfaces 3a and 3b of the work 3, respectively. Here, " close contact " means that the tip of the nozzle and the surface of the work are not in contact with each other, but close to each other with a clearance enough to perform wire electric discharge machining.

At this time, the relative position U0 of the upper wire guide relative to the upper face 3a of the work 3 in the work thickness direction and the relative position U0 of the lower wire guide relative to the lower face 3b of the work 3, And the value of the thickness T of the workpiece are stored in the storage device 51 of the control device 50 as one set of reference positions. The workpiece thickness T is changed to store a plurality of sets of reference positions in the storage device 51 of the control device 50. [

3 shows the relationship between the workpiece thickness T and the relative position U0 in the workpiece thickness direction of the upper wire guide relative to the upper surface 3a of the workpiece 3, And the relative position L0 in the work thickness direction of the lower wire guide relative to the lower surface 3b of the lower surface 3b in the storage device 51 as a reference position. Here, instead of the plate thickness of the work, the positions of the upper and lower wire guides and the relative positions of the upper and lower wire guides in the work thickness direction with respect to the upper and lower surfaces of the work may be stored. The upper reference correction amount CU0 and the lower reference correction amount CL0 are actually stored at respective reference positions.

The wire electrode 4 is positioned at the reference position of the lower wire guide position L0, the workpiece thickness T and the upper wire guide position U0 at positions 100, 101, (102) and position (103). The processing paths of the wire electrode 4 are shifted by the amounts of deflection EU0 and EL0 on the upper surface 3a and the lower surface 3b of the work 3, respectively.

4, the movement path on the working path of the wire electrode 4 is formed on the upper surface 3a of the work 3 in order to solve the machining error (see Fig. 2) of the deflection amounts EU0 and EL0, The upper reference correction amount CU0 and the lower reference correction amount CL0 in the lower surface 3b. 4 shows a state in which when the upper nozzle portion (upper nozzle 9) is brought into close contact with the upper surface of the work 3 and the lower nozzle portion (lower nozzle 10) Are diagrams for explaining an example of correcting an error due to the warping of the electrode (4).

The work 3 is processed in a state in which the upper and lower working liquid discharge nozzles (the upper nozzle 9 and the lower nozzle 10) are in close contact with the upper and lower surfaces 3a and 3b of the work 3 of the plate thickness T to be processed The distances between the upper and lower wire guides 13a and 13b supporting the wire electrode 4 up and down and the upper and lower surfaces 3a and 3b of the work 3 are U0 and L0, respectively. The positional relationship between the upper and lower wire guides 13a and 13b and the work 3 in a state in which the upper and lower nozzles 9 and 10 are in close contact with the upper and lower surfaces 3a and 3b of the work 3 is referred to as & Position, " and its reference position is indicated by (U0, L0). Then, a shape error unit (the phase misregister EU0 and the lower misregistration EL0) caused by the warping of the wire electrode 4 is measured after the work 3 is processed in the positional relationship. The upper and lower shape error units EU0 and EL0 can be regarded as the amount of deflection of the wire electrode 4 at the reference position as shown in Fig.

The correction amount for correcting the machining path for correcting the upper and lower shape error units EU0 and EL0 is referred to as the reference correction amounts CU0 and CL0 for the upper and lower surfaces as shown in Fig. The upper reference correction amount CU0 is obtained from the amount of deflection caused by the relationship between the positions of the wire electrodes 4 and the upper and lower wire guides 13a and 13b in close contact with the upper and lower surfaces of the work 3 as shown in Fig. The reference correction amount CL0 is obtained. In this case, the upper surface reference correction amount CU0 and the lower surface reference correction amount CL0 are substantially equal to each other and the table 2 and the wire electrode 4, (The upper wire guide 13a and the lower wire guide 13b) which are pulled by the upper and lower guide portions 13a and 13b. In the configuration of the wire electric discharge machine 70 shown in Fig. 1, it is only necessary to correct the positions of the X-axis and Y-axis of the table for moving the work relative to the upper and lower guide portions.

≪ 2 > The process of the present invention in which the tip of the upper nozzle and the upper surface of the work are separated

5 shows a case in which the upper nozzle portion is separated from the upper surface 3a of the work 3 and the lower nozzle portion is brought into close contact with the lower surface 3b of the workpiece 3 and the error caused by the bending of the wire electrode 4 is corrected Fig. 6 shows an example in which the upper nozzle portion is separated from the upper surface 3a of the work 3 and the lower nozzle portion is brought into close contact with the lower surface 3b of the work 3, Fig.

When the upper and lower nozzle portions (upper nozzle 9 and lower nozzle 10) can not be brought into close contact with the upper and lower faces 3a and 3b of the work 3 to be processed, the upper and lower faces 3a and 3b of the work 3 The distance U1 between the upper wire guide 13a and the upper surface 3a of the workpiece 3 and the distance U1 between the upper wire guide 13a and the upper surface 3a of the workpiece 3 from the positional information and the positional information of the upper and lower wire guides 13a, The distance L1 between the lower wire guide 13b and the lower surface 3b of the work 3 is calculated.

The shape errors (EU0, EL0) resulting from the amount of bending at the reference position or the reference correction amounts (CU0, CL0), which are the amounts of correction at the reference position, are calculated by multiplying the deflection amount of the wire electrode Calculate on the basis. The deflection amount or the correction amount of the wire electrode 4 thus calculated is set as the deflection amount (the upper deflection amount EU1 and the lower deflection amount EL1) or the correction amount (the upper surface correction amount CU1 and the lower surface correction amount CL1) And the correction amounts CU1 and CL1 on the upper and lower surfaces 3a and 3b of the work 3, respectively.

6, the upper and lower surfaces 3a and 3b of the work 3 are positioned at the same height from the relationship between the plate thickness T of the upper and lower wire guides 13a and 13b and the work 3 and the reference correction amounts EU0 and EL0, Is calculated. The above equation (1) is modified so that the deformation caused by the warping of the wire electrode 4 passes through the position 130, the position 131 and the position 132 in Fig. The upper surface correction amount CU1 in the upper wire guide position U1 is calculated using the modified formula (1). The shape error in the upper and lower surfaces of the work 3 is minimized by controlling the correction movement amount by the XY axis on the lower surface and the correction movement amount by the XY axis on the upper surface.

For example, the thickness of the work 3 is 50 mm, the lower work surface (lower surface 3b) of the work 3 and the lower guide portion (lower nozzle 10) The top and bottom surfaces 3a and 3b of the work 3 overlap with the shape line where the wire electrode 4 is displaced when the work surface (upper surface 3a) and the phase guide portion (upper nozzle 9) The upper deflection amount EU1 and the lower deflection amount EL1 which are the deflection amounts or the upper surface correction amount CU1 and the lower surface correction amount CL1 which are the correction amounts can be obtained by calculating the positional deviation amount in the points.

≪ 3 > The process according to any one of < 3 >, wherein the tip of the upper nozzle and the upper surface of the work are separated from each other,

8 shows a state in which the upper nozzle portion (upper nozzle 9) is separated from the upper surface 3a of the work 3 and the lower nozzle portion (lower nozzle 10) is separated from the lower surface 3b of the work 3 And the error due to the warping of the wire electrode 4 is not corrected. 9 shows a state in which the upper nozzle portion (upper nozzle 9) is separated from the upper surface 3a of the work 3 and the lower nozzle portion (lower nozzle 10) is separated from the lower surface 3b of the work 3 Fig. 5 is a view for explaining an example of correcting an error due to warping of the wire electrode 4. Fig. The modified formula (1) of the wire electrode 4 passing through the position 150, the position 151, and the position 152 shown in Fig. 9 is obtained. Then, the upper surface correction amount CU1 at the upper wire guide position U1 at this time is calculated.

When the upper and lower nozzle portions (upper nozzle 9 and lower nozzle 10) can not be brought into close contact with the upper and lower faces 3a and 3b of the work 3 to be processed, the upper and lower faces 3a and 3b of the work 3 The distance U1 between the upper wire guide 13a and the upper surface 3a of the workpiece 3 and the distance U1 between the upper wire guide 13a and the upper surface 3a of the workpiece 3 from the positional information and the positional information of the upper and lower wire guides 13a, The distance L1 between the lower wire guide 13b and the lower surface 3b of the work 3 is calculated.

The amount of deflection of the wire electrode 4 according to the calculated distances U1 and L1 is calculated based on the deflection amount at the reference position (the phase error unit EU0 and the lower error unit EL0) (The upper surface reference correction amount CU0 and the lower surface reference correction amount CL0), which is the correction amount in the reference correction amount C0. An error caused by the warping of the wire electrode 4 is detected by the deflection amount EU1 or EL1 or the correction amounts CU1 and CL1 of the calculated wire electrode 4 by the upper and lower surfaces 3a and 3b of the work 3, 3b by the deflection amounts EU1, EL1 or the correction amounts CU1, CL1, respectively.

12 is a block diagram of a main part of a wire electric discharge machine.

The wire electric discharge machining apparatus 70 according to the present invention can automatically correct the machining path in accordance with the angle formed by the moving block forming the corner portion. A block of the machining program is read and analyzed from the machining program storage unit 61 in which the machining program 60 is stored and the corner angle detecting unit 62 determines whether or not there is a corner. A correction path is created in the machining path correcting unit 63 in accordance with the angle and the wire electrode 4 is moved relative to the work 3 by the machining path control unit 64. [ If there is no corner, the wire path electrode 4 is moved relative to the workpiece 3 by the machining path control unit 64 without creating a correction path.

The machining path correcting section 63 calculates the correction distance (the above-described correction amount) and the return distance on the basis of the corner angle detected by the corner angle detecting section 62, and extends the end point of the block to be processed first according to the correction distance And the machining path is corrected so as to connect the new block end point created by the elongation and the new block start point created by deletion, And outputs the path to the machining path control unit 64. [ (Specifically, see Japanese Laid-Open Patent Publication No. 2014-121755).

Fig. 13 is a flowchart showing a process in the case where correction is performed independently in the upper and lower wire guides by the distance between the upper and lower guides according to the present invention. Hereinafter, this processing will be described in each step.

[Step SB01] The thickness T of the workpiece 3 and the workpiece thickness of the upper wire guide relative to the upper surface 3a of the workpiece 3 in a state in which the upper nozzle and the lower nozzle are in close contact with the surface of the workpiece, And the relative position L0 in the work thickness direction of the lower wire guide relative to the lower face 3b of the work 3 are stored.

[Step SB02] The information stored in step SB01 and the actual distance U1 between the upper wire guide 13a and the upper surface 3a of the work 3 and the actual distance U1 between the lower wire guide 13b and the work 3 The amount of warpage EU1 on the work upper surface 3a of the wire electrode 4 and the work under surface 3b from the actual distance L1 between the lower surface 3b and the thickness T of the work 3 (EL1) is calculated.

[Step SB03] The correction amount (upper surface correction amount) CU1 of the phase guide position and the correction amount (lower surface correction amount) CL1 of the lower guide position are calculated from the amount of deflection EU1 and the amount of deflection EL1 calculated in step SB02 .

[Step SB04] The correction path for the upper wire guide position and lower wire guide position is calculated by the upper surface correction amount CU1 and the lower surface correction amount CL1 calculated in step SB03.

[Step SB05] The correction path calculated in step SB04 is output, and this process is terminated.

In the example described above, the upper surface correction amount CU1 and the lower surface correction amount CL1 of the upper and lower wire guides 13a and 13b are calculated based on the above equation (1). Instead of this equation, a machining path error in a combination of many work plate thicknesses and up and down guide positions may be measured by a machining experiment, and the machining path errors may be stored as respective correction amounts, for example, as shown in the table of Fig. 10 or the graph of Fig. 11 .

14 is a diagram showing the relationship between the relative positions (U1, L1) of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece and the set of the workpiece thicknesses T as a reference position, (The upper surface correction amount CU1 and the lower surface correction amount CL1) for correcting the deviation of the actual machining position on the work upper surface due to the wire guide coordinate position on the machining program path and the wire warping at the time of machining to be.

A table shown in Fig. 14 is stored in the storage device 51 of the control device 50. Fig. The upper wire guide position (upper surface distance) U1 is 5, 10, 20, 30 (mm), the lower wire guide position (lower side distance) The upper surface correction amount CU1 and the lower surface correction amount CL1 in each case where the line L1 is 5, 10, 20, and 30 (mm) are stored. In Fig. 14, "CU1" and "CL1" are described in all columns, but actual values are stored according to the upper surface distance U1 and the lower surface distance L1.

Fig. 10 is a view showing an amount of correction in the case where the upper nozzle portion is separated from the upper surface 3a of the work 3 and the lower nozzle portion is brought into close contact with the lower surface 3b of the work 3 to be. Fig. 11 is a graph showing Fig. 10. Fig. The " upper nozzle gap " corresponds to a value obtained by subtracting the distance between the distal end of the upper nozzle and the wire guide from the upper wire guide position U1. The "upper surface correction amount" corresponds to the upper surface correction amount CU1, and the "lower correction amount" corresponds to the lower correction amount CL1.

Hereinafter, an example of a control apparatus for controlling the wire electric discharge machine body constituting the wire electric discharge machining apparatus according to the present invention will be described with reference to a block diagram. Blocks of similar functions will be described using the same reference numerals.

First, a first example of a control device for controlling the wire electric discharge machine main body will be described with reference to the block diagram of Fig.

The control device 50 has a reference position storage section 81 for storing the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower workpiece guides in the workpiece thickness direction and the workpiece thickness as reference positions, A correction amount storage section 82 for storing a correction amount for correcting the deviation of the actual machining position in the workpiece top face due to wire bending at the time of machining, and a wire guide coordinate position on the machining program path at the reference position, A setting unit (80) for setting a relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the work upper and lower surfaces at arbitrary upper and lower wire guide positions and a workpiece thickness; A relative position of the upper and lower wire guides in the work thickness direction with respect to the work upper and lower surfaces of the set upper and lower wire guides A correction amount calculation unit (83) for calculating a correction amount for correcting each deviation amount in the workpiece thickness; and a correction amount calculation unit And a wire guide position correcting section 84 which corrects the phase guide section and the lower guide section independently based on a correction amount.

Instead of the correction amount storage section 82, a deviation amount storage section for storing the deviation amount of the actual machining position on the workpiece upper surface due to the wire guide coordinate position on the machining program path at the reference position and the wire bending at the time of machining , And a correction amount calculating section for calculating the correction amount from the deviation amount stored in the deviation amount storage section.

Next, a second example of the control device for controlling the wire electric discharge machine main body will be described with reference to the block diagram of Fig.

The control device 50 includes a reference position storage section 81 for storing a plurality of sets of relative positions and workpiece thicknesses in the workpiece thickness direction with respect to the workpiece upper and lower surfaces of the upper and lower wire guides, A correction amount storage section 82 for storing a correction amount for correcting the deviation of the actual machining position on the upper and lower surfaces of the workpiece due to the wire guide coordinate position on the path and the wire bending at the time of machining, A setting portion 80 for setting the relative positions of the upper and lower wire guides in the work thickness direction and the work thickness of the upper and lower wire guides relative to the work upper and lower wire guides, The upper and lower wire guides are moved in the direction of the work thickness direction with respect to the work upper and lower surfaces of the set upper and lower wire guides Based on a plurality of reference positions of the selected plurality of sets and a correction amount stored by the correction amount storage unit, a selection unit (85) for selecting a plurality of taps close to the position and the thickness of the work, A correction amount calculating section (83) for calculating a correction amount for correcting each deviation amount in the thickness of the work relative position in the work thickness direction with respect to the upper and lower surfaces, And a wire guide position correcting section (84) for correcting the position of the upper and lower wire guides in the movement command independently of the phase guide section and the lower guide section on the basis of the calculated correction amount.

14, when the corresponding reference position can not be specified by one set, for example, when the top distance U1 is 15 mm, the selector 85 selects two reference positions Is selected. The correction amount calculating section 83 calculates the correction amount by interpolating the top face correction amount CU1 and the bottom correction amount CL1 stored corresponding to the set of the two selected reference positions.

Instead of the correction amount storage section 82, a deviation amount memory for storing a deviation amount of the actual machining position on the workpiece top face due to the wire bending at the time of machining and the wire guide coordinate position on the machining program path at a plurality of reference positions And a correction amount calculating section for calculating a correction amount from the deviation amount stored in the deviation amount storing section.

Next, a third example of the control device for controlling the wire electric discharge machine main body will be described with reference to the block diagram of Fig.

The control device (50) includes a reference position storage section (81) for storing a plurality of sets of relative positions and workpiece thicknesses in the workpiece thickness direction with respect to the workpiece upper and lower surfaces of the upper and lower wire guides, A correction amount storage section 82 for storing a correction amount for correcting the deviation of the actual machining position on the upper and lower surfaces of the workpiece due to wire bending at the time of machining, A setting section (80) for setting a relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces and a workpiece thickness, and a correction section , Relative positions of the upper and lower wire guides in the work thickness direction with respect to the work upper and lower surfaces of the set upper and lower wire guides, A correction amount calling section (86) for calling a correction amount for correcting the vehicle; and a correction amount calling section (86) for calling the correction amount for correcting the vehicle, based on the called correction amount, And a wire guide position correcting section 84 for independently correcting the position of the wire guide position correcting section. The correction amount calling section 86 determines that the upper limit distance U1 and the lower distance L1 corresponding to the relative positions of the upper and lower surfaces set by the setting section 80 and the thickness T of the workpiece are not stored, The upper surface correction amount CU1 and the lower surface correction amount CL1 are called.

Instead of the correction amount storage section 82, a deviation amount memory for storing a deviation amount of the actual machining position on the workpiece top face due to the wire bending at the time of machining and the wire guide coordinate position on the machining program path at a plurality of reference positions And a correction amount calculating section for calculating a correction amount from the deviation amount stored in the deviation amount storing section.

In the control device shown in the block diagrams of Figs. 15, 16 and 17, the reference position storage section 81 stores a plurality of pairs of relative positions and workpiece thicknesses in the workpiece thickness direction with respect to the workpiece top and bottom of the upper and lower wire guides A plurality of sets of positions of the upper and lower wire guides and relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece may be stored.

According to the present invention, when one of the upper nozzle portion and the lower nozzle is separated from the upper surface 3a or the lower surface 3b of the work 3 and the other is brought into close contact with the upper surface 3a or the lower surface 3b of the work 3 Even when the upper nozzle 3a and the lower surface 3b of the work 3 are separated from each other, the machining error in the upper and lower surfaces of the work can be minimized, It is possible to obtain a high-precision and high-precision machining result without an increase in machining time due to a reduction in machining speed caused by energy reduction for reducing warpage.

Claims (7)

A wire electric discharge machine in which a wire electrode is stretched on upper and lower wire guides, and the wire electrode and the workpiece are moved relative to each other based on a machining program,
A reference position storage section for storing, as a reference position, a relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the workpiece upper surface and the workpiece thickness in a state in which the upper and lower wire guides are close to the upper and lower workpiece guides,
A correction amount storage section for storing a correction amount for correcting the deviation of the actual machining position in the workpiece top face due to the wire bending at the time of machining, the wire guide coordinate position on the machining program path at the reference position,
A setting section for setting a relative position of the upper and lower wire guides in a workpiece thickness direction with respect to a work upper surface at an arbitrary upper and lower wire guide positions and a thickness of the work,
Calculating a correction amount for correcting each deviation amount in the relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the workpiece upper and lower surfaces of the set upper and lower wire guides and the workpiece thickness based on the stored reference position and the correction amount, A calculation unit,
A wire for correcting the position of the upper and lower wire guides in the relative movement command of the wire guide and the workpiece instructed in the machining program independently of the phase guide portion and the lower guide portion based on the correction amount calculated by the correction amount calculating portion, And a guide position correcting unit. A wire electric discharge machine in which a wire electrode is extended to upper and lower wire guides, and the wire electrode and the workpiece are moved relative to each other based on a machining program,
A reference position storage section for storing a plurality of reference positions of a pair of the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece,
A correction amount storage section for storing a correction amount for correcting the deviation of the actual machining position on the upper and lower surfaces of the workpiece due to the wire bending at the time of machining, a wire guide coordinate position on the machining program path at the plurality of reference positions,
A setting section for setting a relative position of the upper and lower wire guides in the work thickness direction with respect to the work upper surface at an arbitrary upper and lower wire guide position and a thickness of the work,
The relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the set upper and lower workpieces and the workpiece thickness from the set of the relative positions of the upper and lower wire guides in the workpiece thickness direction and the workpiece thickness, A selection unit for selecting a plurality of closest matches;
Based on the plurality of reference positions of the selected plurality of sets and the correction amount stored by the correction amount storage section, the relative positions of the upper and lower wire guides in the work thickness direction with respect to the upper and lower workpiece upper and lower surfaces of the set upper and lower wire guides, A correction amount calculating unit for calculating a correction amount for correcting the deviation amount of the light amount of the light beam,
The position of the upper and lower wire guides in the relative movement command of the wire guide and the work commanded in the machining program is corrected independently of the phase guide section and the lower guide section based on the correction amount calculated by the correction amount calculating section And a wire guide position correcting unit. A wire electric discharge machine in which a wire electrode is extended to upper and lower wire guides, and the wire electrode and the workpiece are moved relative to each other based on a machining program,
A reference position storage section for storing as a reference position a plurality of pairs of the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece,
A correction amount storage section for storing a correction amount for correcting the deviation of the actual machining position on the upper and lower surfaces of the workpiece due to the wire bending at the time of machining, a wire guide coordinate position on the machining program path at the plurality of reference positions,
A setting section for setting a relative position and a workpiece thickness of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower workpieces at arbitrary upper and lower wire guide positions,
From the plurality of reference positions stored in the reference position storage section and the correction amount stored in the correction amount storage section, the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the workpiece upper and lower surfaces, A correction amount calling unit for calling a correction amount for correcting each deviation amount in the image,
A wire that corrects the positions of the upper and lower wire guides in the relative movement command of the wire guide and the work commanded in the machining program independently of the phase guide portion and the lower guide portion based on the correction amount called by the correction amount calling portion, And a guide position correcting unit. A wire electric discharge machine in which a wire electrode is extended to upper and lower wire guides, and the wire electrode and the workpiece are moved relative to each other based on a machining program,
A reference position storage section for storing, as a reference position, a relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece in a state in which the upper and lower wire guides are close to the upper and lower surfaces of the workpiece,
A deviation amount storage section for storing a deviation amount of an actual machining position on a workpiece upper surface due to a wire bending at the time of machining, a wire guide coordinate position on the machining program path at the reference position,
A deviation correction amount calculation unit for calculating a correction amount from the deviation amount stored in the deviation amount storage unit;
A setting section for setting a relative position of the upper and lower wire guides in the work thickness direction with respect to the work upper surface at an arbitrary upper and lower wire guide position and a workpiece thickness,
And the correction amount calculated by the deviation correction amount calculation unit, the relative position of the upper and lower wire guides in the work thickness direction with respect to the work upper and lower surfaces of the set upper and lower wire guides, A correction amount calculating unit for calculating a correction amount for correcting the vehicle;
A wire for correcting the position of the upper and lower wire guides in the relative movement command of the wire guide and the workpiece instructed in the machining program independently of the phase guide portion and the lower guide portion based on the correction amount calculated by the correction amount calculating portion, And a guide position correcting unit. A wire electric discharge machine in which a wire electrode is extended to upper and lower wire guides, and the wire electrode and the workpiece are moved relative to each other based on a machining program,
A reference position storage section for storing as a reference position a plurality of pairs of the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece,
A deviation amount storage section for storing a deviation amount of an actual machining position in a wire work guide position on a machining program path at the plurality of reference positions and an actual machining position in a workpiece top face due to wire bending at the machining,
A deviation correction amount calculation unit for calculating a correction amount from the deviation amount stored in the deviation amount storage unit;
A setting section for setting the relative positions of the upper and lower wire guides in the work thickness direction with respect to the upper and lower workpieces at arbitrary upper and lower wire guide positions and the workpiece thickness,
The relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the set upper and lower workpieces and the workpiece thickness from the set of the relative positions of the upper and lower wire guides in the workpiece thickness direction and the workpiece thickness, A selection unit for selecting a plurality of closest matches;
And the correction amount calculated by the deviation correction amount calculation unit based on a plurality of reference positions of the selected plurality of sets and a correction amount calculated by the deviation correction amount calculation unit in the relative positions of the upper and lower wire guides in the work thickness direction with respect to the work upper and lower surfaces of the set upper and lower wire guides, A correction amount calculating unit for calculating a correction amount for correcting each deviation amount,
A wire for correcting the position of the upper and lower wire guides in the relative movement command of the wire guide and the workpiece instructed in the machining program independently of the phase guide portion and the lower guide portion based on the correction amount calculated by the correction amount calculating portion, And a guide position correcting unit. A wire electric discharge machine in which a wire electrode is extended to upper and lower wire guides, and the wire electrode and the workpiece are moved relative to each other based on a machining program,
A reference position storage section for storing as a reference position a plurality of pairs of the relative positions of the upper and lower wire guides in the workpiece thickness direction with respect to the upper and lower surfaces of the workpiece,
A deviation amount storage section for storing a deviation amount of an actual machining position in a wire work guide position on a machining program path at the plurality of reference positions and an actual machining position in a workpiece top face due to wire bending at the machining,
A deviation correction amount calculation unit for calculating a correction amount from the deviation amount stored in the deviation amount storage unit;
A setting section for setting the relative positions of the upper and lower wire guides in the work thickness direction with respect to the upper and lower workpieces at arbitrary upper and lower wire guide positions and the workpiece thickness,
A correction amount calculating unit for calculating a correction amount for correcting each deviation amount in the relative position of the upper and lower wire guides in the workpiece thickness direction with respect to the set upper and lower work pieces and the workpiece thickness from the stored plurality of reference positions and the correction amount calculated by the deviation correction amount calculating unit, A correction amount calling unit for calling the correction amount calling unit,
A wire that corrects the positions of the upper and lower wire guides in the relative movement command of the wire guide and the work commanded in the machining program independently of the phase guide portion and the lower guide portion based on the correction amount called by the correction amount calling portion, And a guide position correcting unit. 7. The method according to any one of claims 1 to 6,
The reference position storing section may store the reference position of the upper and lower wire guides relative to the upper and lower wire guides relative to the upper and lower wire guides in relation to the position of the upper and lower wire guides relative to the upper and lower wire guides, And a plurality of sets of relative positions in the direction of the wire.
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JP2008036720A (en) 2006-08-01 2008-02-21 Fanuc Ltd Wire electric discharge machine

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JP2000218440A (en) * 1999-01-27 2000-08-08 Brother Ind Ltd Wire electric discharge machine
JP4041261B2 (en) * 2000-03-10 2008-01-30 株式会社ソディック Wire electrical discharge machine
JP2011235405A (en) * 2010-05-11 2011-11-24 Mitsubishi Electric Corp Wire electric discharge machining device, and wire electric discharge machining method
JP4938137B1 (en) * 2011-03-03 2012-05-23 ファナック株式会社 Wire-cut electric discharge machine with a function to detect the upper surface of the workpiece
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JP5657715B2 (en) * 2013-01-11 2015-01-21 ファナック株式会社 Wire electrical discharge machine with wire electrode position correction function

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JP2008036720A (en) 2006-08-01 2008-02-21 Fanuc Ltd Wire electric discharge machine

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