JPH0722851B2 - Wire guide span measurement method and wire electrode vertical alignment method in wire cut electric discharge machine - Google Patents

Description

The present invention relates to a wire-cut electric discharge machine, and in particular, positions a wire guide quickly and accurately so that a wire electrode is perpendicular to a moving plane of a workpiece. The present invention also aims to obtain accurate data on the wire guide span required for the subsequent taper processing by the verticalizing operation.

[Prior Art] In a wire-cut electric discharge machine, the degree of perpendicularity of a wire electrode to a moving plane of a workpiece, which is a reference plane for machining, directly affects machining accuracy and is an extremely important matter.
In addition, accurate measurement of the distance between the upper and lower wire guides is an essential matter in addition to the vertical alignment in order to perform the tapering process with high accuracy.

Conventionally, there are the following two methods as typical ones known as the method of vertically extending the wire electrode of this type. The first method is disclosed in Japanese Patent Application Laid-Open No. 54-104099, in which one of a pair of upper and lower wire guides and a work mount that can move in two directions of X-axis and Y-axis orthogonal to each other is used. And a moving device for moving the workpiece in parallel to the X-axis and the Y-axis. The workpiece mount has a first detection surface composed of two upper and lower detection pieces perpendicular to the X-axis, and a vertical plane to the Y-axis. A vertical gauge having a second detection surface composed of two upper and lower detection pieces is attached. First, the workpiece mount is set in one direction of the X axis, and one of the detection pieces above and below the first detection surface is a wire electrode. Move until it comes into contact with. When contact was detected, the contact was detected either above or below the detection piece so that the one wire guide was parallel to the X axis in a direction away from the detection piece contacted by the wire electrode, or no contact was detected. A preset small distance is moved in the direction of contacting the detection piece. This operation is repeated until the upper and lower detection pieces simultaneously contact the wire electrodes. This is a method of completing the vertical alignment by performing this also for the Y axis. The second method is the method described in JP-A-1-103229, and using the same apparatus as the above method, first, one wire guide is moved in parallel with the X axis to move the wire electrode. After tilting, the workpiece mount is moved in one direction of the X-axis until one of the upper and lower detection pieces of the vertical gauge touches the wire electrode. Then, attach the work mount
The vertical gauge on the mount is moved in a direction away from the wire electrode by a distance d, and the one wire guide is further moved in a direction in which the wire electrode guided by the wire guide is further away from the vertical gauge. , Move parallel to the X axis by a distance e. Next, the workpiece mount is moved in one direction of the X axis until the other of the upper and lower detection pieces of the vertical gauge on the mount comes into contact with the wire electrode, and the moving distance f thereof is obtained. Then, the above distances d, e, f and the distances a, b between the wire guides input as machine-specific values and the detection pieces close thereto.
And the distance W between the upper and lower detection pieces, which has been measured in advance, to calculate the moving distance required for the vertical movement of the wire guide moved first.
(In the above description, in order to contrast with the present invention, the terms described in the publication are not used, and substantially the same method is explained by the original terms. However, the symbols are as described in the publication.) Problems to be Solved by the Invention] However, the first method is a method of moving the wire guide by a small distance and repeating the moving operation of the wire guide until the wire electrodes simultaneously contact the upper and lower two detection pieces. It took a lot of time to make the vertical, and the work efficiency was lowered, and there was a problem in productivity.

In the second method, the distance W between the upper and lower detection pieces of the vertical gauge and the distances a and b between each wire guide and the detection pieces close to it are measured in advance and input as machine-specific values. It is something that is calculated using something.

However, in a normal wire-cut electric discharge machine, the upper and lower wire guides are heavily worn, and it is necessary to replace the wire guide after every fixed time of operation. a and b change delicately. Therefore, the vertical method cannot be performed accurately by the above-described method using the values of a and b input as the machine-specific values. Further, a method conventionally proposed as a method of measuring the accurate values of a and b is a method of performing after the vertical alignment of the wire electrode is completed, which includes a basic contradiction and is not a practical method. There wasn't.

Further, conventionally, in the case of this type of wire-cut electric discharge machine, when performing taper processing which is often required,
As shown in the figure, the thickness B attached to the workpiece mount 10
When the program surface S for which the machining locus is instructed is set above the workpiece 50 by a distance p from the upper surface of the workpiece mount, in order to taper the workpiece by the angle θ, Intersection Q between program surface S and wire electrode 1
The horizontal distance S _U between the upper wire guide 2 and the upper wire guide 2 and the distance S _L between the intersection Q and the lower wire guide 3 must be obtained.

Therefore, the distance e from the lower wire guide 3 to the upper surface of the work mount and the vertical adjustment amount z of the upper wire guide 2 are zero.
The distance d between the upper wire guide 2 and the upper surface of the workpiece mount 10 at the time of, the adjustment amount z by which the upper wire guide 2 is vertically adjusted for machining, and the program surface S and the workpiece mount 10 It is calculated by the following equation from the distance p to the upper surface.

S _U = (d + z−p) · tan θ …… (1) S _L = (e + p) · tan θ …… (2) In the above formula, p is a value arbitrarily set by the operator, and z is a workpiece. This value can be read by the upper wire guide up / down adjusting device although it varies depending on the thickness of the wire. However, the values of d and e are required to be accurately measured at each processing because of dimensional changes due to the use of upper and lower wire guides, variations in parts, and the like.

Hereinafter, d and e will be referred to as true wire guide spans, d will be referred to as true upper wire guide spans, and e will be referred to as true lower wire guide spans.

The wire guide spans d and e are used to explain the vertical sizing method described below and the upper wire guide 2 and the vertical sizing gauge 40.
The distance a to the detection surface end near the upper wire guide 2 and the distance b to the detection surface end near the lower wire guide 3 have the following relationship.

d = a + h + c-z e = b-c Here, h is the distance between the upper and lower detection surface ends of the vertical gauge 40, and c is the vertical gauge from the upper surface of the workpiece mount.
It is the height up to the end of the detection surface close to the lower wire guide 3 of 40, and is a value peculiar to the vertical gauge 40 used.

Therefore, the value of the true wire guide span d, e is
It can be easily obtained from the value of.

Therefore, in the following description, these values of a and b will also be referred to as upper and lower wire guide spans, respectively, for ease of description.

The present invention has been made to solve the above problems, and the distances a and b between the upper and lower wire guides and the vertical gauge are provided.
Can be calculated easily and accurately, and the position data obtained for the calculation can be used as data for vertical alignment, so that accurate vertical alignment can be completed in an extremely short time. It provides an improved method in which the value of b can be used in calculations for subsequent machining, especially taper machining.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a workpiece mount on which a workpiece is mounted and fixed, relative to a wire electrode, and X-axes orthogonal to each other. A workpiece driving device that moves in both directions of the Y axis, two wire guides that are arranged above and below the workpiece and that stretches wire electrodes, and one of the wire guides is in the U axis direction that is parallel to the X axis. And a wire guide driving device for moving in the V-axis direction parallel to the Y-axis, a vertical protrusion gauge having two detection surfaces mounted and fixed on the workpiece mount and orthogonal to each other, and the detection surface. In a wire electric discharge machine comprising a detection device for detecting contact with a wire electrode, the one wire guide is moved in one of the two U and V axes by the wire guide driving device, and the other wire guide is moved. Through the wire guide Said workpiece said comprises a perpendicular uv-o to mount moving plane wire guide moving direction in two positions u to sandwich the vertical plane _2, u ₃ and even more its second position the outer two-position u _1, u ₄ that In each direction, and the work mount is moved by the work drive device in each of the X and Y biaxial directions in a direction parallel to the wire guide movement direction. , the contact position x ₁ in each of the time between the detection surface and the wire electrode of the verticality gauge, x _2, x _3, the calculated x _4, the inner u ₁ of preceding four positions,
The distance U ₁ between u ₂ and the distance U ₁ between u ₃ and u _4
3, the four inner x _1, the x ₂ therebetween distance X of the contact position
₁ , the distance X ₃ between x ₃ and x ₄ is obtained, respectively, and by using these values and the distance h between the upper and lower ends of the detection surface of the vertical gauge that is measured in advance, the one wire guide And a distance a from the detection surface end of the vertical gauge close to the wire guide and a distance b between the other wire guide and the detection surface end of the vertical gauge close to the wire guide are calculated. .

A second invention is to carry out the above method for other axial directions of the two U and V axes of the one wire guide, and arithmetically average each value of a and b obtained in both directions. To obtain the measurement results of a and b.

A third aspect of the invention is that a workpiece mount on which a workpiece is placed and fixed is mounted and fixed relative to a wire electrode,
A workpiece driving device that moves in both directions of an X axis and a Y axis that are orthogonal to each other, two wire guides that are arranged above and below the workpiece and that stretches wire electrodes, and one of the wire guides is the X axis. Parallel to the U-axis and V parallel to the Y-axis
A wire guide driving device that moves in the axial direction and the one wire guide are positionally adjustable in a direction perpendicular to a moving plane moved by the U and V axes, and the work mount. A wire-cut electric discharge machine equipped with a vertical gauge that can be placed and fixed on and has two detection surfaces that are orthogonal to each other, and a detection device that detects contact between the detection surface and a wire electrode. The guide is moved in one of the two U and V axes by the wire guide driving device at an arbitrary vertical adjustment position to pass through the other wire guide and perpendicular to the work mount moving plane uv- The two positions u ₂ and u ₃ and the two positions u ₁ and u ₄ further outside the two positions sandwiching a plane perpendicular to the wire guide moving direction including o are sequentially positioned in one direction at each position. The workpiece mount is moved by the workpiece driving device in a direction parallel to the moving direction of the wire guide in the biaxial directions of X and Y, so that the detection surface of the vertical gauge and the wire electrode are The contact positions x ₁ , x ₂ , x ₃ , x ₄ at each of the time points are obtained, and among the front four positions, the distance U ₁ between u ₁ and u ₂ and the distance U ₃ between u ₃ and u ₄ , and Of the four contact positions, the distance X ₁ between x ₁ and x ₂ and the distance X ₃ between x ₃ and x ₄ and the distance between the upper and lower ends of the detection surface of the vertical gauge that has been measured in advance By h, the distance a between the one wire guide and the detection surface end of the vertical gauge near the wire guide and the distance b between the other wire guide and the detection surface end of the vertical gauge near the wire guide. Then, the moving distance of one of the wire guides required to vertically extend the wire electrode, that is, Each position in a plane perpendicular to the wire guide travel direction, including a line uv-o perpendicular to the workpiece mount travel plane through the other wire guide
From one position uj of one of u ₁ , u ₂ , u ₃ , and u ₄ sandwiching a plane including the perpendicular uv-o from the one position ui or a position uj that is separated from the one position ui by a distance Ui. Distance tj ＝ (Ui−ti)
Is calculated from the numerical values a, b, h, the distance Ui, and the distance Xi corresponding to the Ui among the contact position distances, and the wire guide driving device is driven based on the calculation result. One of the U and V axes is vertically aligned, and the steps substantially the same as the above steps are performed.
The third invention is one in which the vertical alignment of the wire electrode is completed by executing the process in the other axial direction of the two V axes.

The fourth invention of the present invention is characterized in that the vertical alignment accuracy is improved by repeating the above-mentioned method at least twice.

The fifth invention is, in the third or fourth invention, measured, calculated, and used in each vertical alignment in the U-axis direction and the V-axis direction performed immediately after completion of all vertical alignment operations. The distance a between the one wire guide and the detection surface end of the vertical gauge close to the wire guide and the distance b between the other wire guide and the detection surface end of the vertical gauge near the wire guide are two. It is characterized in that the arithmetic mean of the values is obtained and this arithmetic mean value is used as data for calculation for subsequent processing.

Next, a sixth aspect of the present invention is the same wire-cut electric discharge machine as the third aspect of the invention, wherein the one wire guide is moved in any one of the U and V biaxial directions by the wire guide drive device at an arbitrary vertical position. A vertical line uv to the plane of movement of the workpiece mount through the other wire guide
A first step of positioning at a _first position u ₁ sufficiently away from a plane perpendicular to the wire guide moving direction including -o;
A second step in which the first contact position x ₁ between the detection surface of the vertical gauge and the wire electrode is determined by the detection device by moving the Y-axis in a direction parallel to the movement direction of the wire guide. And a third step of moving the one wire guide in the same direction as the wire guide driving device to position the wire guide at a second position u ₂ closer to the plane than the first position u _1. A fourth step of moving the work mount in the same direction as the work drive device to obtain a _second contact position x ₂ between the detection surface of the vertical gauge and the wire electrode by the detection device; A fifth position locating the one wire guide at a third position u ₃ apart from a plane perpendicular to the wire guide moving direction including the perpendicular uv-o on the side opposite to the second position u ₂ . Step and drive the work piece The workpiece mount is moved in the same direction by the location, a sixth step of by the detection device obtains a third contact position x ₃ between the detection surface and the wire electrode of the verticality gauge, the wire guide drive said one of the wire guide is moved in the same direction by the apparatus, and a seventh step of positioning a fourth position u ₄ distant from the plane than the third position u _3, the workpiece drive device An eighth step of moving the workpiece mount in the same direction as described above, and obtaining a fourth contact position x ₄ between the detection surface of the vertical gauge and the wire electrode by the detection device,
Of the above four positions, the distance U ₁ between u ₁ and u ₂ and the distance between u ₃ and u ₄
U _3, and the distance X ₁ between x ₁ and x _{2 of the} four contact positions,
By the distance X ₃ between x ₃ and x ₄ and the distance h between the upper and lower ends of the detection surface of the vertical gauge that has been measured in advance,
A first step consisting of a ninth step of calculating distances a, b between each of the upper and lower wire guides and the detection surface end of the vertical gauge close to the respective wire guides; The wire guide including a moving distance of the one wire guide necessary for verticalizing the wire electrode in the same axial direction as the above, that is, a perpendicular line uv-o to the work mount moving plane passing through the other wire guide. A distance ti from one position ui among the positions u ₁ , u ₂ , u ₃ , u ₄ to the plane perpendicular to the moving direction or the perpendicular uv from the one position ui.
-One other position sandwiching a plane including o and separating a distance Ui
The distance tj = (Ui−ti) from uj is defined by the numerical values a and b obtained by the first step, the previously measured value h, and the distance Ui and the distance between each contact position. , A first step of calculating with the distance Xi corresponding to the distance Ui, and driving the wire guide drive device based on the calculation result to perform vertical extension in one of the U and V axes. A second step consisting of a second step and a step substantially the same as the first and second steps in the other axial directions of the U and V biaxial third, fourth It is characterized by comprising the following steps.

The seventh invention of the present invention is intended to improve the accuracy of vertical alignment by repeating the first to fourth steps of the sixth invention at least twice.

Further, in the eighth invention, in the sixth or seventh invention, after the completion of all the vertical steps, in each vertical step in the U-axis direction and the V-axis direction performed immediately before, measurement, calculation, The distance a between the one wire guide used and the end of the detection surface of the vertical gauge close to the wire guide and the distance b between the other wire guide and the end of the detection surface of the vertical gauge close to the wire guide. It is characterized in that a step of obtaining an arithmetic average of two values is provided, and the arithmetic average value obtained by this step can be used as data for calculation for subsequent processing.

[Operation] According to the present invention, the vertical feed gauge is attached to the work mount, and the distances a and b between the upper and lower wire guides and the ends of the vertical feed gauge close to the wire guides are set to one wire guide. Positioning is carried out sequentially at the above-mentioned four positions, and the workpiece mounting base is moved for each positioning, and the contact position between the vertical gauge and the wire electrode is obtained. Use the data and the data of the contact position between the vertical gauge and the wire electrode for each of the four positions, and add the distance h between the upper and lower ends of the detection surface of the vertical gauge that has been measured in advance. In addition, using the obtained data, the amount of movement of the wire guide required for vertical alignment is calculated by calculation, and the wire guide is moved according to the calculation result. Therefore, it is possible to perform vertical alignment with high accuracy in a short time. Further, according to this method, accurate vertical alignment is always possible without being affected by variations in the shape and size of the wire guide.

Next, the calculation method of the present invention will be described with reference to FIG. 4 and FIG.

In FIG. 4, at the four positioning positions u ₁ , u ₂ , u ₃ , u _{4 of the} one wire guide and the contact positions x ₁ , x ₂ , x ₃ , x ₄ between the vertical gauge and the wire electrode. On the other hand, let the position of the other wire guide be O, draw an auxiliary line parallel to the line segment u ₂ -O that passes u ₁ and connects u ₂ and O, and passes this auxiliary line and the point O to the above u ₁ ~u ₄ the intersection of the line parallel to the line connecting the O ', also an intersection point between an extended line of the x ₁ ~x ₄ and the auxiliary line x' as, formed therein △ u ₁ -O -O 'and △ u ₁
Comparing with −x′−x ₁ , the following equation holds.

U ₁ : (a + h + b) = (U ₁ −X ₁ ): a Further, the following equation holds from Δu ₃ −O−u ₄ and Δx ₃ −Ox ₄ .

U ₃ : (a + h + b) = X ₃ : b From these, the following two equations are derived.

_{a · U 1 = (U 1} -X 1) · (a + h + b) ...... (11) U 3 · b = X 3 · (a + h + b) ...... (12) (11) This expression from expression is derived.

a = {(U ₁ −X ₁ ) ・ (h + b)} / X ₁ (13) Substituting this (13) into (12), U ₃・ b = {X ₃・ U ₁・ (h + b) } / X _{1 From} this equation, the following equation is derived.

b = U ₁ · h · X ₃ / (U ₃ X ₁ −U ₁ X ₃ ) (14) From the above equations (13) and (14), the following equation holds.

a = U ₃ · h · (U ₁ −X ₁ ) / (U ₃ X ₁ −U ₁ X ₃ ) ... (15) As is clear from these equations, the values of a and b are h
And U ₁ , U ₃ and five values of X ₁ , X ₃ can be calculated by calculation.

Further, with reference to FIG. 5, a method of calculating the movement amount of one wire guide required for vertical alignment will be described.

Two positions ui, uj sandwiching an intersection uv between the moving surface of one wire guide and a perpendicular from the other wire guide O to the moving surface.
And the contact position between the vertical gauge and the wire electrode at each position is xi, xj, ∠ui-O-uv is α, and ∠uj-
If O-uv is β, the distance t from ui to the point uv
And the distance Ui between the ui and uj and the distance Xi between the xi and xj can be expressed by the following equations.

t = (a + h + b) · tan α …… (a) Ui = (a + h + b) · tan α + (a + h + b) · tan β ...
… (B) Xi = (h + b) · tan α + b · tan β …… (c) From the above equation (c), tan β = [Xi− (h + b) · tan α] / b Substituting this into equation (b) yields Ui = (A + h + b) (tanα + Xi / b-htanα / b-tanα), and the following formula can be derived from this.

tan α = [(a + h + b) · Xi−b · Ui] / (a + h + b) ·
h Substituting this tan α into the equation (a), the following equation (d) is obtained.

ti = b (Xi-Ui) / h + a · Xi / h + Xi ...... (d) i.e., the four positioning position of one of the wire guides necessary verticality of the wire _{electrode, u 1, u 2, u} 3, u The distance t from any one ui of _{4 to} the point uv is the position ui
From one to another position uj that sandwiches the point uv, and
It can be calculated by the distance Xi between the contact positions Xi and Xi corresponding to ui and uj, a and b calculated by the calculation in the previous stage, and the upper and lower end distance h of the vertical gauge detection surface that is measured in advance. .

As is apparent from the above description, the present invention allows one of the wire guides to be vertically adjusted at any arbitrary vertical adjustment position even if the wire electrode is not vertically aligned in advance. Two positions, four positions in total, are sequentially positioned, and by simply determining the contact position between the wire electrode and the vertical gauge for each positioning, the upper and lower wire guides and the detection surface edge of the vertical gauge near each wire guide The distance to the part can be measured very accurately, and the data obtained by the measurement can be used to calculate the data necessary for vertical alignment of the wire electrode. Therefore, it is possible to perform the vertical alignment relatively easily and accurately. Further, even if the wire guide is replaced, it is possible to perform accurate vertical alignment without being affected by the variation of the replaced wire guide.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a workpiece driving device having an X axis and a Y axis which are orthogonal to each other, and one wire guide (the upper wire guide 2 in this embodiment) is capable of adjusting its vertical position. (This vertical position adjusting device is omitted in the figure.), And a wire for the wire guide 2 having a U axis parallel to the X axis and a V axis parallel to the Y axis. It is a figure which shows the schematic block diagram of the wire cut electric discharge machine which has a guide drive device.

The workpiece mount 10 is moved by the X-axis motor 11 and the Y-axis motor 12 in the X-axis direction and the Y-axis direction orthogonal to each other, and is movable in a horizontal XY plane. The feed mechanism including the X and Y axis motors 11 and 12 constitutes a workpiece driving device. The wire electrode 1 is positioned by the upper and lower wire guides 2 and 3, and the wire electrode 1 is guided by the upper and lower wire guides 2 and 3 while being given a predetermined tension by a brake roller and a driving roller (not shown). Run up and down. The lower wire guide 3 is fixed at a predetermined position, and the upper wire guide 2 is adjusted by a vertical position adjusting device (not shown) to a desired position in the vertical direction (direction perpendicular to a UV plane described later). The X axis is made possible by the U-axis motor 13 and the V-axis motor 14.
It is movable in a horizontal plane and a U-V plane parallel to the -Y plane, and the feed mechanism including these U and V axis motors 13 and 14 constitutes a wire guide driving device. The tilt angle of the wire electrode is controlled by the position of the upper wire guide 2 on the UV plane.

Each of the U and V axes has a machine origin, and an origin signal is sent to the NC device at each machine origin position. still,
Reference numeral 6 indicates a detection device, and reference numerals 7 and 8 indicate a U-axis moving device and a V-axis moving device, respectively, which repeat devices for repeatedly performing the same type of operation according to a predetermined set value inputted. 9 is connected.

The X-, Y-, U-, and V-axis motors 11 to 14 are connected to an NC device 20, and the NC device has a CPU 21 and a memory 22, and each axis is connected via controllers 23 to 26 and drivers 27 to 30. Control the motors 11-14.

On the other hand, on the work mount 10, prior to the start of the vertical operation, first and second vertical detection gauges 40 having the first and second detection surfaces P1 and P2 orthogonal to each other are placed and fixed, and the detection surface P1,
P2 is made orthogonal to the X axis and the Y axis.
A pair of upper and lower detection end faces 45, 46 and 47, 48 are formed on the detection faces P1 and P2 of the vertical gauge 40, respectively.

The detection device 6 for detecting the contact between the vertical gauge 40 and the wire electrode 1 is provided between the wire electrode 1 and each output end surface 45, 46, 47, 48 of the vertical gauge 40 via the power supply 15. By applying a low voltage of about 5 to 10 V, the contact is electrically detected by the detection circuit 31.

The CPU 21 executes an NC program previously stored in the memory 22 and a calculation program. The CPU 21 drives the U and V axis motors and the X and Y axis motors according to the NC program and input information, and the position information and the The contact position information based on the detection signal from the detection circuit is stored in the memory 22, and according to the calculation program, each wire guide is based on the position information and the distance between the upper and lower detection ends of the vertical gauge that is measured in advance. And the distance between the wire guide and the detection end face of the vertical gauge close to each wire guide are calculated, and the calculation result is stored in the memory 22.

Next, using these information and the calculation results, calculate the moving distance of the upper wire guide necessary for vertical alignment,
The vertical movement is completed by driving the wire guide driving device according to the calculation result.

At this time, as described above, following the measurement and calculation of the distance between the wire guide and the detection end face of the vertical gauge close to the wire guide in the U-axis direction (hereinafter simply referred to as the wire guide span), the vertical extension in the U-axis direction is performed. After that, after measuring and calculating the wire guide span in the V-axis direction,
Whether to perform vertical movement in the axial direction or vertical movement in both the U-axis and V-axis directions is the average of the wire guide spans measured for both U and V axes after the calculation of the wire guide spans in the V-axis direction. Whether the value is obtained and then based on the average value can be arbitrarily selected as needed.

FIG. 3 is a flow chart for explaining the above control and calculation, and this flow chart and the fourth
The vertical movement operation and calculation of the wire cut electric discharge machine according to the present invention will be described with reference to FIGS. 5, 5 and 6.

When the NC device 20 is given a wire guide shunt measurement command (step 100), it is determined whether the U and V axes have already been returned to the origin of the machine (step 101). If it has not been returned to the mechanical origin, a warning is displayed to prompt the operator to select the origin return mode, or the machine automatically returns to the mechanical origin return mode for the U and V axes, and the wire guide drive is attached. The upper wire guide 2 is urged to position the mechanical origin. When the return to the mechanical origin is complete, item i
Is substituted with 0 (step 102). And the U and V
One of the axes, for example, the U-axis driving device is energized to position the upper wire guide 2 at a position of ui ₊₁ , that is, at a point u ₁ apart from the machine origin uo by a distance Uo ( Step 103). When the positioning is completed, the work mount 10 is driven in the X axis + direction (to the right in FIG. 4), and the wire electrode 1 is attached to the detection end face of the vertical gauge 40 mounted on the work mount. The work mount 10 is stopped at the contact position x ₁ and the position is stored (step 106). Therefore, it is determined whether or not the item i is 1 and equal to or larger than 1 (step 107), and if not equal or larger than 1, 1 is added to the item i (step 109), and the item i is 4 at step 110. If it is not equal, the process returns to step 103, and steps 103 to 106 are executed again. Here, the upper wire guide 2 is moved to the position of u ₁ to u ₂ , and the work mount 10 is moved to the position of x ₁ to x ₂ . It is again determined in step 107 whether i and 1 are equal to or greater than 1. If i is 1 or 1 or more, the process proceeds to step 108. Here, the following calculation is performed to obtain Ui and Xi.

Ui = | ui ₊₁ −ui | Xi = | xi ₊₁ −xi | The above operation is repeated until item i = 4 is determined in step 110. If i = 4 is determined, step 111
And the next data calculated in step 108 until then U ₁ = | u ₂ −u ₁ | X ₁ = | x ₂ −x ₁ | U ₂ = | u ₃ −u ₂ | X ₂ = | x ₃ −x ₂ | U ₃ ＝ | u ₄ −u ₃ | X ₃ ＝ | x ₄ −x ₃ | of U ₁ , U ₃ , X ₁ , and X _3, which are pre-measured and input. The distance h from the upper surface of the upper detection end surface 45 of the vertical gauge 40 to the lower surface of the lower detection end surface 46 of the vertical gauge 40, and the upper detection end surface 45 of the vertical gauge 40 from the upper wire guide 2.
The distance a from the upper surface of the lower wire guide 3 to the lower surface of the lower detection end surface from the lower wire guide 3 to the above expressions (14) and (15), that is, b = U ₁ · h · X ₃ / (U ₃ X ₁ −U ₁ X ₃ ) …… (14) a = U ₃ · h ・ (U ₁ −X ₁ ) / (U ₃ X ₁ −U ₁ X ₃ ) …… (15) The calculation based on the formula is executed, and the values of a and b which are the calculation results are stored in the memory 22.

Next, although not directly related to the present invention, after the vertical alignment of the present invention is completed, a workpiece of thickness B is attached to the workpiece mount 10 to perform taper processing as shown in FIG. Data required for the distance d from the upper wire guide 2 to the upper surface of the workpiece 50 when the vertical adjustment amount z of the upper wire guide 2 is 0, and the distance e from the lower wire guide 3 to the lower surface of the workpiece 50. And the vertical position adjustment amount z of the upper wire guide that has been measured and input in advance, the distance c from the lower surface of the workpiece to the lower surface of the lower detection end surface 46, and the a and b values calculated in step 111. The value is calculated by the following formula (step 112).

d = a + h + c−z e = b−c Next, the upper wire guide 2 is moved from any one of the above four positions u ₁ , u ₂ , u ₃ and u ₄ for vertical alignment. Step 11 for calculating the amount of movement ti or tj = (Ui−ti)
Move to 3. In this step, the operation of the equation (d) described above with reference to FIG. 5 is executed.

ti = b · (Xi−Ui) / h + a · Xi / h + Xi (d) Further, the arbitrary position of the upper wire guide is not one of u ₁ and u ₂ in FIG. 5, but u ₃ , U ₄ is selected, the value of tj = (Ui−ti) is calculated after the calculation of ti.

Subsequently, the routine goes to step 114, it moves the upper wire guide 2 to the position of the ui, or remain in the position of the u _4, the moving distance of the operation result of ti or tj = (Ui-ti) from its position To do so, the wire guide drive is energized.

With the above, vertical alignment of the upper wire guide 2 in the U-axis direction is completed. Then, the same steps as described above are performed in the V-axis direction to complete vertical alignment of both the U and V axes.

In the above example, the method of performing the vertical adjustment in the U-axis direction following the measurement of the wire guide spans a and b in the U-axis direction is shown. Of course, it is also possible to measure a and b in the V and V axis directions, obtain the arithmetic mean of these a and b values, and then perform vertical alignment in the U and V axis directions. Is.

Also, d and e are calculated from the arithmetic mean of the values of a and b,
The d and e may be used as data for subsequent taper processing.

Further, in order to check whether or not the above vertical movement is accurately performed, step 115 is provided in the above-described embodiment, and the workpiece mount is used to move the workpiece mount toward the wire electrode for which vertical movement is completed. It is checked whether or not the wire electrodes simultaneously move and contact the upper and lower detection end faces 45, 46 of the vertical gauge 40. If the wire electrodes do not come into contact with the upper and lower detection end faces at the same time, the process returns to step 102 again, and the same process is repeated by giving different values to u ₁ , u ₂ , u ₃ , and u ₄ thereafter. You can also However, according to the present invention, since it is possible to perform vertical alignment with a high degree of accuracy, this step is not necessarily required in practice, and therefore the description using the flowchart is omitted.

EFFECTS OF THE INVENTION According to the present invention, the distance between each of the upper and lower wire guides and the end of the upper and lower detection surfaces of the vertical gauge used and the one close to each wire guide, that is, the guide span Since the measurement is performed in a short time, and the amount of movement of the upper wire guide necessary for vertical alignment is calculated using the data obtained by the measurement, and the wire guide drive device is operated according to the result, Accurate and highly accurate vertical alignment can be performed in an extremely short time, and it is particularly useful as a pre-process in general processing as well as taper processing.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing the configuration of a wire cut electric discharge machine of the present invention, FIG. 2 is a block diagram mainly showing the configuration of its control device, and FIG. 3 shows the method of the present invention as a processing procedure in a CPU. FIG. 4 is a flow chart showing the principle of measuring the wire guide span of the present invention by the operation of the upper wire guide 2 with respect to the lower wire guide 3, and FIG.
FIG. 6 is an explanatory view for explaining the principle of calculation of the amount of movement of the upper wire guide necessary for vertical alignment, and FIG. 6 is a relational diagram when the workpiece 50 of thickness B is tapered. In the figure, 1 is a wire electrode, 2 is an upper wire guide, 3 is a lower wire guide, 4 is a work drive device, 5 is a wire guide drive device, 10 is a work mount, 11 is an X-axis motor, and 12 is Y.
An axis motor, 13 is a U axis motor, 14 is a V axis motor, 20 is an NC device, 21 is a CPU, 22 is a memory, 40 is a vertical gauge, and 50 is a workpiece of thickness B.

Claims (8)

[Claims] 1. A workpiece driving device for moving a workpiece mount, on which a workpiece is mounted and fixed, in both directions of an X axis and a Y axis which are orthogonal to each other with respect to a wire electrode, and sandwiches the workpiece. Two wire guides arranged above and below to stretch the wire electrodes and one of the wire guides are connected in parallel with the X axis.
A wire guide driving device that moves in an axial direction and a V-axis direction that is parallel to the Y-axis, a vertical projection gauge that is mounted and fixed on the workpiece mount and that has two detection surfaces that are orthogonal to each other, and the detection. In a wire cut electric discharge machine comprising a detection device for detecting contact between a surface and a wire electrode, the one wire guide is moved by the wire guide drive device in one of the U and V biaxial directions. , Two positions u ₂ and u ₃ which sandwich a plane perpendicular to the wire guide moving direction and which includes a perpendicular line uv-o passing through the other wire guide to the work mount moving plane and two positions further outside the two positions. Positions u ₁ and u ₄ are sequentially positioned in one direction, and at each positioning time, the work mount is moved in the X and Y biaxial directions in a direction parallel to the wire guide movement direction. Move by object drive Brought to the contact position x ₁ wherein at each time point of the detection surface and the wire electrode of the verticality gauge,
x _2, x _3, the calculated x _4, the inner u _1, from u ₂ therebetween distance U ₁ of preceding four positions, u _3, the distance therebetween U ₃ from u _4, the inner of the four contact positions x ₁ , X ₂ to the distance X ₁ between them, x ₃ and x ₄ to find the distance X ₃ between them respectively, and those values and the distance between the upper and lower ends of the detection surface of the vertical gauge that has been measured in advance. By h, the distance a between the one wire guide and the detection surface end of the vertical gauge near the wire guide and the distance b between the other wire guide and the detection surface end of the vertical gauge near the wire guide. A method for measuring a wire guide span in a wire cut electric discharge machine, which is characterized by calculating 2. The method described above is carried out for the other axial direction of the U and V biaxes of the one wire guide, and the respective values of a and b obtained in both directions are arithmetically averaged. The measurement results of a and b are set as the measurement results of the wire guide span in the wire cut electric discharge machine according to claim 1. 3. A workpiece driving device for moving a workpiece mount, on which a workpiece is mounted and fixed, in both directions of an X axis and a Y axis which are orthogonal to each other with respect to a wire electrode, and sandwiches the workpiece. Two wire guides arranged above and below to stretch the wire electrodes and one of the wire guides are connected in parallel with the X axis.
A wire guide driving device that moves in an axial direction and a V-axis direction parallel to the Y-axis, and the one wire guide are positionally adjustable in a direction perpendicular to a moving plane moved by the U-axis and the V-axis. And a wire provided with a vertical gauge that can be mounted and fixed on the workpiece mount and has two detection surfaces that are orthogonal to each other, and a detection device that detects contact between the detection surface and the wire electrode. In the cut electric discharge machine, the one wire guide is moved in one axial direction of the U and V biaxes by the wire guide driving device at an arbitrary vertical adjustment position, and the machining is performed through the other wire guide. Two positions u ₂ sandwiching a plane perpendicular to the wire guide moving direction including a vertical line uv-o to the object mount moving plane,
u ₃ and two positions u ₁ and u ₄ further outside of the two positions are sequentially positioned in one direction, and the work mount is moved in the two axial directions of X and Y at each of the positioning points. guide the move by the workpiece drive device in the moving direction parallel to the direction of seeking a contact position _{x 1, x 2, x 3} , x 4 in each of the time between the detection surface and the wire electrode of the verticality gauge , Of the four front positions, the distance U ₁ between u ₁ and u ₂ and the distance U ₃ between u ₃ and u ₄ ,
Of the four contact positions, the distance X ₁ between x ₁ and x ₂ and x ₃ and x ₄
The distance X ₃ between them and the distance h between the upper and lower ends of the detection surface of the vertical gauge, which is measured in advance, between the one wire guide and the end of the detection surface of the vertical gauge close to the wire guide. After the distance a and the distance b between the other wire guide and the detection surface end portion of the vertical projection gauge near the wire guide are calculated, the moving distance of the one wire guide necessary for the vertical projection of the wire electrode, that is, the other One of the positions u ₁ , u ₂ , u ₃ , u ₄ in a plane perpendicular to the wire guide moving direction including a perpendicular line uv-o to the workpiece mount moving plane passing through the wire guide The distance ti from ui or the distance tj = (Ui-ti) from another position uj that sandwiches the plane including the perpendicular uv-o from the one position ui and is separated by the distance Ui from the numerical values a and b. , H and the distance
Of the distances between Ui and the contact positions, the distance Xi corresponding to the Ui is calculated, and the wire guide drive device is driven based on the calculation result, so that the uniaxial direction of the two U and V axes is calculated. A wire cut discharge characterized by completing vertical alignment and performing vertical alignment of the wire electrode by performing substantially the same process as the above process in the other axial directions of the U and V axes. Wire electrode vertical alignment method in processing machine. 4. The method for vertically extending a wire electrode in a wire electric discharge machine according to claim 3, wherein the method is repeated at least twice. 5. A wire guide and its wire guide, which have been measured, calculated, and used, in the vertical projection in each of the U-axis direction and the V-axis direction performed immediately after completion of all the vertical alignment work. The arithmetic mean of the two values of the distance a from the detection surface end of the near vertical gauge and the distance b between the other wire guide and the detection surface end of the vertical gauge close to the wire guide is calculated, and the arithmetic mean is calculated. The method for vertically extending a wire electrode in a wire-cut electric discharge machine according to claim 3 or 4, wherein the value is used as data for calculation for subsequent machining. 6. The wire-cut electric discharge machine according to claim 3, wherein the one wire guide is driven by the wire guide driving device in one axial direction among the two U and V axes at an arbitrary vertical position. Moving to the first position u ₁ sufficiently distant from a plane perpendicular to the wire guide moving direction including a vertical line uv-o passing through the other wire guide to the workpiece mount moving plane. One step, and moving the work mount by the work drive device in a direction parallel to the movement direction of the wire guide in the two axial directions of X and Y,
The second step of obtaining the _first contact position x ₁ between the detection surface of the vertical gauge and the wire electrode by the detection device, and moving the one wire guide in the same direction as the wire guide drive device. The first position
A third step of positioning at a _second position u ₂ closer to the plane than u _{1, a} workpiece mount is moved in the same direction by the workpiece drive device, and the vertical alignment gauge is made by the detection device. The fourth step of obtaining the second contact position x ₂ between the detection surface and the wire electrode, and the one wire guide from the plane perpendicular to the wire guide moving direction including the perpendicular uv-o to the second Fifth step of positioning at a _third position u ₃ away from the position u ₂ ; moving the work mount in the same direction by the work drive device; A sixth step of determining a _third contact position x ₃ between the detection surface of the output gauge and the wire electrode, and the one wire guide is moved in the same direction by the wire guide driving device to move the third contact position x ₃ . It said than the position u ₃ flat A seventh step of positioning a fourth position u ₄ away from the the workpiece drive device to move the workpiece mount in the same direction, the detection surface and the wire electrode of the verticality gauge by the detection device An eighth step of obtaining a fourth contact position x ₄ with, and among the four positions,
The distance U ₁ between u ₁ and u ₂ and the distance U ₃ between u ₃ and u ₄ and the distance X ₁ between x ₁ and x ₂ among the four contact positions and between x ₃ and x ₄ Distance x ₃
And a distance h between the upper and lower end portions of the detection surface of the vertical gauge that is measured in advance, a distance a between each of the one wire guides and the detection surface end portion of the vertical gauge near each wire guide. , B, a first step consisting of a ninth step, and a movement distance of the one wire guide necessary for vertically extending the wire electrode in the same axial direction as the above U and V axes. That is, of each of the positions u ₁ , u ₂ , u ₃ , u ₄ in a plane perpendicular to the wire guide moving direction including a perpendicular line uv-o to the workpiece mount moving plane passing through the other wire guide. A distance ti from one position ui or a distance tj = (Ui-ti) from another position uj that sandwiches a plane including the perpendicular uv-o from the one position ui and is separated by a distance Ui is Numerical values a and b obtained by the process of For measuring the measured value h and the distance Ui and the distance Xi corresponding to the distance Ui among the distances between the contact positions, and the wire guide drive based on the calculation result. A second step comprising a second step of driving an apparatus to perform vertical extension in one of the U and V axes, and substantially the same steps as the first and second steps Is the U,
A method for vertically extending a wire electrode in a wire-cut electric discharge machine, comprising: a third step and a fourth step performed in the other axial direction of the two V axes. 7. The method for vertically extending a wire electrode in a wire-cut electric discharge machine according to claim 6, wherein the first to fourth steps are repeated at least twice. 8. The wire guide and the wire guide thereof, which has been measured, calculated, and used in the U-axis direction and V-axis direction vertical process performed immediately before the completion of all the vertical process. A step of obtaining an arithmetic mean of two values, a distance a from the detection surface end of the vertical gauge close to the distance a and a distance b between the other wire guide and the detection surface end of the vertical gauge close to the wire guide. In the wire cut electric discharge machine according to claim (6) or (7), the arithmetic mean value obtained by this step can be used as data for calculation for subsequent machining. Wire electrode vertical alignment method.