JP5303442B2 - Measuring method of vertical guide position in wire electric discharge machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure a vertical guide position, by measuring the position of a wire electrode on the horizontal coordinate axis of a lower guide in a vertical state and an optional inclined state of the wire electrode by using a round bar tool of a complete round shape. <P>SOLUTION: In this vertical guide position measuring method, the wire electrode 1 is brought into point contact with a circumferential surface 5 of the round bar tool 4 in the vertical state and the inclined state to a table upper surface 11, to measure respective positions of the wire electrode 1 in a horizontal coordinate surface 13 of the lower guide 3. When measuring the respective positions, a distance DB between an upper guide 2 and the lower guide 3 being a distance in the vertical direction to the table upper surface 11 and a distance DA up to the table upper surface 11 and the lower guide 3, can be measured based on a similar right-angled triangle having an inclination &theta; of the inclined state formed of the wire electrode 1, a round bar tool diameter R, the horizonal coordinate axes 12 of the upper guide 2 and the horizontal coordinate axes 13 of the lower guide 3. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vertical guide position measuring method in a wire electric discharge machine capable of measuring the positions of an upper guide and a lower guide with respect to a table using, for example, a wire electrode and a measuring jig.

  By the way, in the wire electric discharge machine, when the wire electrode is inclined and the workpiece is tapered, the workpiece to be machined is attached to move the upper guide and the lower guide relative to each other so that the wire electrode has a specified angle. The upper and lower wire support point positions relative to the upper surface of the table must be measured in advance.

  Conventionally, as a method of measuring the vertical guide position in a wire electric discharge machine, a rectangular parallelepiped block having a known height H as shown in FIG. The vertical guide position measurement method measures the distance DA between the upper surface 11 of the table 10 and the horizontal coordinate axis 13 of the lower guide 3 and the distance DB between the horizontal coordinate axis 12 of the upper guide 2 and the horizontal coordinate axis 13 of the lower guide 3. It is. In FIG. 3A, a rectangular parallelepiped block 22 having a height H is fixed to the upper surface 11 of the table 10, and the wire electrode 1 is placed on the end surface 23 of the rectangular parallelepiped block 22 in a vertical state (or a state perpendicular to the horizontal direction of the table upper surface 11). The end face position P1 of the rectangular parallelepiped block 22 on the horizontal coordinate axis 13 of the lower guide 3 is detected. In FIG. 3B, the upper guide 2 is moved relative to the lower guide 3 by a distance U so that the wire electrode 1 is inclined by an angle θ, and the wire electrode 1 is brought into contact with the lower end angle 27 of the rectangular parallelepiped block 22. The moving distance G1 of the lower guide 3 from the end face position P1 of the block 22 is measured. In FIG. 3C, the upper guide 2 is moved relative to the lower guide 3 by the distance U to incline the wire electrode 1 in the opposite direction by the angle θ, and the wire electrode 1 is moved to the upper end angle of the rectangular parallelepiped block 22. 27, the wire electrode 1 is inclined and the moving distance G2 of the upper end face 26 of the rectangular parallelepiped block 22 from the end face position P1 of the rectangular parallelepiped block 22 is measured. These positions P1, G1, and G2 are measured, and in FIG. 4, which is an enlarged view of FIG. 3C, a right angle formed by the horizontal coordinate axis 12 of the upper guide 2, the wire electrode 1, and the position of the lower guide 3. ΔKLM which is a triangle, ΔKNP which is a right triangle formed by the upper end surface 26 of the rectangular parallelepiped block 22 and the positions of the wire electrode 1 and the lower guide 3, and the positions of the table surface 11 of the table 10, the wire electrode 1 and the lower guide 3 ΔKQR, which are right-angled triangles formed by the above, are similar to each other, and the inclination angle θ of the wire electrode 1 is the same, so that the following equation is established.

Here, the distance between the lower guide 3 and the table upper surface 11 is DA, and the distance between the upper guide 2 and the lower guide 3 is DB.
The distance DA is calculated as follows.
From a similar right triangle, DA / G1 = (DA + H) / G2.
DA · G2 = G1 (DA + H)
DA (G2-G1) = H · G1
Therefore, DA = H · G1 / (G2-G1)
The distance DB is calculated as follows.
From a similar right-angled triangle, DA / G1 = DB / U holds.
DB = U ・ DA / G1
Therefore, DB = U · H / (G2-G1)
Therefore, the distance DA and the distance DB can be calculated using the measured values G1 and G2 and the known height H.

  Conventionally, wire right angle and vertical wire guide positioning jigs in a wire electric discharge machine are known. The jig is provided with detection surfaces that do not come into contact with the wire at the top and bottom in the vicinity of two orthogonal corners, and at the same time, at least one of the orthogonal surface or another surface orthogonal to the surface does not contact the wire at the same time. An inclined surface having upper and lower detection surfaces is provided (see, for example, Patent Document 1).

  Conventionally, a method for measuring the position of an electrode guide in a wire electric discharge machine is known. The electrode guide position measuring method includes a jig plate having a contact portion formed at a tip mounted on a stage and a calculation unit that performs calculation related to the positions of the upper electrode guide and the lower electrode guide. With the guide set to an arbitrary height and the wire electrode in the running state being vertical, contact detection is performed on the jig plate, the upper electrode guide is moved in the U or V axis direction, and the Z axis The movement of the table in the X and Y directions at the time of execution of the contact detection and the U electrode of the upper electrode guide are performed. , Based on the movement distance in the V direction, the equivalent vertical distance on the actual processing device between the lower electrode guide and the upper surface of the mounting table and the reference position on the Z-axis scale prepared in advance with the lower electrode guide Upper power And calculates the equivalent vertical distance on the actual machining device between the upper electrode guide the origin of the axis to hold the guide in upon origin combined (e.g., see Patent Document 2).

  As a measuring device for a wire electric discharge machine, one that measures the heights of upper and lower fulcrums of a wire electrode is known. The measuring device of the wire electric discharge machine has an upper and lower contact sensor and a contact detection display device, and the upper and lower contact sensors can move up and down respectively, and the height of each fulcrum at the upper and lower fulcrum of the wire electrode as a contacted object. The position can be measured (for example, see Patent Document 3).

  Conventionally, a method of measuring and adjusting the position of the wire electrode with respect to the mechanical axis of the electric erosion machine is known. In the measurement / adjustment method, a wire electrode is stretched between two wire guides, the wire guides can be positioned with respect to each other, and at least one of the wire guides is moved from a first position parallel to the machine axis. Moved to two positions, the magnitude of the inclination of the wire electrode relative to any axis is determined for at least one directional component, and the machine axis in at least one directional component is determined based on this measured value and the moving magnitude The spatial direction of the wire electrode with respect to is calculated (for example, see Patent Document 4).

JP-A-5-337745 JP-A 64-40218 Japanese Utility Model Publication No. 4-54629 JP-A-8-323546

  In the conventional method for measuring the vertical guide position in a wire electric discharge machine, in the example in which the rectangular parallelepiped block 22 as shown in FIG. 3 is used as a measurement jig, it is assumed that the height H is known. It takes time to measure the height H, and the rectangular parallelepiped block 22 has sharp edges at the corners of the upper and lower ends. When measuring the positions of the upper and lower guides 2 and 3, the wire electrode 1 must be brought into contact with the edges. However, when the wire electrode 1 comes into contact with the upper and lower edges of the rectangular parallelepiped block 22 of the measuring jig, the surface of the wire is damaged, and the powder accumulates on the rectangular parallelepiped block 22 and the accuracy of position detection deteriorates. When contacting the upper and lower edges of the wire, the wire electrode was disconnected and the measurement was interrupted. In addition, when the upper and lower edges of the measuring jig are processed with an arc chamfer 24 or a linear chamfer 25 as shown in FIGS. 5A and 5B, the inclination angle of the wire electrode 1 is 45 °. There is a problem that the reference height of the rectangular parallelepiped block 22 is different at the boundary.

  An object of the present invention is to solve the above problem, and to measure the vertical guide position in a wire electric discharge machine, a round circle having an arbitrary diameter whose size is unknown without using a conventional rectangular parallelepiped block. The wire electrode extending vertically (or perpendicular to the horizontal coordinate axis of the lower guide) can be measured in the diametric direction of the round bar jig by the end face projection function of the wire electric discharge machine. Measure the position of the lower guide of the wire electrode on the horizontal coordinate axis by making contact with both end faces, that is, the diametrically opposed outer peripheral surface, measure the diameter of the round bar jig, and appropriately determine the wire electrode as desired. Measurement of the vertical guide position in a wire electrical discharge machine that can measure the radial length and position of a round bar jig while tilted at an inclination angle, and calculate the position of the vertical guide by calculating these measurement information. It is to provide a law.

The present invention provides a table upper surface of the table using a wire electrode guided by an upper guide and a lower guide positioned below the upper guide, and a measuring jig attached to a work mounting table. In a method for measuring the vertical guide position in a wire electric discharge machine, comprising measuring the distance between the upper guide and the lower guide and the distance between the upper guide and the lower guide,
Use a round rod jig as a circular jig as the measurement jig fixed to the upper surface of the table,
The wire electrode is brought into contact with a circumferential end surface of the round bar jig in a vertical state with respect to the table upper surface and a predetermined inclination angle, and a horizontal coordinate axis of the lower guide. Measuring each position of the wire electrode;
At each measurement of the position, a similar right triangle having the inclination angle formed by the wire electrode, the diameter and center of the round bar jig, the horizontal coordinate axis of the upper guide, and the horizontal coordinate axis of the lower guide And calculating and measuring the distance between the upper guide and the lower guide that is perpendicular to the upper surface of the table and the distance between the upper surface of the table and the lower guide. The present invention relates to a vertical guide position measuring method in a wire electric discharge machine.

  In the vertical guide position measuring method in the wire electric discharge machine, the measured information on the horizontal coordinate axis of the lower guide is obtained by connecting the wire electrode extending perpendicularly to the table upper surface to the round bar jig. The diameter of the round bar jig detected by calculating the distance between the horizontal coordinate axes of the lower guide and the cross-section of the round bar jig are true when they are brought into contact with opposing circumferential end faces on the circumference. A circle detected by calculating the distance between the horizontal coordinate axes of the lower guide by contacting each of the opposed peripheral end surfaces on the circumference of the round bar jig while being inclined by the inclination angle in the direction of the circle. The bar guide diameter projection distance and the upper guide detected by measuring the distance the relative movement of the upper guide is performed to incline the wire electrode from a state where the upper and lower guides are perpendicular to the table upper surface. It is an inclined minute distance on the flat coordinate axis.

  In the method of measuring the vertical guide position in this wire electric discharge machine, the measured information is a distance between two points of the center coordinates of the round bar jig diameter and the midpoint coordinates of the round bar jig diameter projection distance. This is the distance of the round bar jig center projection detected by calculation. Alternatively, the measured information includes the distance detected by calculating the distance on the wire electrode in the inclined state by the diameter of the round bar jig and the inclination angle, and the wire electrode in the inclined state of the inclination angle. And a distance detected by calculating the distance between the horizontal coordinate axes of the lower guide and the wire electrode in the reversely inclined state.

  In the method of measuring the vertical guide position in this wire electric discharge machine, the diameter of the round bar jig and the projected diameter of the round bar jig are obtained by dividing the diameter of the round bar jig by the projected diameter of the round bar jig. A calculation value obtained by dividing the wire electrode diameter by a constant is corrected by subtracting from the distance between the horizontal coordinate axes of the lower guide.

  In the method of measuring the vertical guide position in this wire electric discharge machine, the contact state between the wire electrode and the peripheral end surface on the circumference of the round bar jig can be ensured corresponding to the inclination angle of the wire electrode, A certain measurement accuracy can be ensured by correcting the measurement value according to the inclination angle of the wire electrode.

  In the method of measuring the vertical guide position in the wire electric discharge machine, the diameter of the round bar jig is such that the wire electrode extending perpendicularly to the upper surface of the table contacts the peripheral end surface on the circumference of the round bar jig. Thus, correction is made by subtracting the wire electrode diameter from the distance between the horizontal coordinate axes of the lower guide.

  Since the method for measuring the vertical guide position in the wire electric discharge machine according to the present invention is configured as described above, the round bar jig used as the measurement jig is formed in a perfect circle shape. The contact point is always an arc of the same curvature, and the wire electrode and the round bar are made by making the round bar jig easily by polishing the round bar and smoothing the surface roughness. The contact friction with the jig can be reduced, the wire electrode can be prevented from being damaged or disconnected, and a round bar can be obtained simply by moving the wire electrode in the vertical and inclined directions and moving the wire electrode in the horizontal direction. The diameter of the jig can be easily measured, and the contact point between the wire electrode and the round bar jig is always a point contact of an arc, and the table top surface and the bottom are not affected by the inclination angle of the wire electrode. The distance between the guide and Since the same detection accuracy can be secured for the measurement of the distance between the upper guide and the lower guide, and the diameter of the round bar jig can be measured, the size of the measuring jig can be measured in advance as in the past. This makes it possible to easily manufacture a round bar jig, thus making it possible to reduce the overall cost of measuring the position of the upper and lower guides.

It is explanatory drawing which shows 1st Example which comprises the vertical guide position measuring method in the wire electric discharge machine by this invention, (A) is explanatory drawing which shows the process in which a wire electrode measures the diameter of a round bar jig, (B) is an explanatory view showing the process of measuring the jig diameter projection distance of the wire electrode when the wire electrode is inclined, and (C) is the wire electrode and the upper guide surface when the wire electrode is in the vertical state and the inclined state. FIG. 6 is an explanatory view showing a similar right triangle formed by a lower guide surface and a round bar jig. FIG. 2 is an enlarged explanatory view showing an example of a similar right triangle shown in FIG. It is explanatory drawing which shows the up-and-down guide position measuring method in a wire electric discharge machine when a rectangular parallelepiped block is used as the conventional measuring jig, and (A) is an explanation showing the process in which the wire electrode measures the end face position of the measuring jig. FIGS. 4A and 4B are explanatory views showing a process of measuring the position of the horizontal coordinate axis of the lower guide by tilting the wire electrode in contact with the lower end of the rectangular parallelepiped block, and FIG. It is explanatory drawing which shows the process of making it incline in the state made to contact and measuring the position of the horizontal coordinate axis of a lower guide. FIG. 4 is an enlarged explanatory view showing an example of a similar right triangle shown in FIG. FIG. 4 is a chamfered state formed at the upper end of the rectangular parallelepiped block shown in FIG. 3, (A) shows an arc chamfer, and (B) is an explanatory diagram showing a straight chamfer. It is explanatory drawing which shows another 3 similar right-angled triangle for demonstrating the 2nd Example which comprises the up-and-down guide position measuring method in the wire electric discharge machine by this invention.

  Embodiments of a method for measuring the vertical guide position in a wire electric discharge machine according to the present invention will be described below with reference to the drawings. The method of measuring the vertical guide position in this wire electric discharge machine is as follows: the wire electrode 1 guided and supplied by the upper guide 2 and the lower guide 3 positioned below the upper guide 2; 11 is mainly used to measure the distance DA between the table upper surface 11 and the lower guide 3 and the distance DB between the upper guide 2 and the lower guide 3. First, the round bar jig 4 constituting the measuring jig is fixed to the table upper surface 11 of the table 10 in the wire electric discharge machine. Therefore, the wire electrode 1 is in a vertical state (the vertical state of the wire electrode 1) with respect to the table upper surface 11 and is brought into contact with the opposite peripheral end surfaces 6 and 7 of the circumferential surface 5 of the round bar jig 4 (for details, see And the respective positions X1 and X2 of the wire electrode 1 on the horizontal coordinate axis 13 of the lower guide 3 are measured, and the wire electrode 1 is tilted at an arbitrary angle with respect to the table upper surface 11 at a predetermined inclination angle. Each of the wire electrodes 1 on the horizontal coordinate axis 13 of the lower guide 3 is brought into contact (specifically, point contact) with the opposite peripheral end surfaces 8 and 9 of the circumferential surface 5 of the round bar jig 4 in an inclined state of θ. Positions X3 and X4 are measured.

  The method of measuring the vertical guide position in this wire electric discharge machine is such that the diameter R and midpoint (center of diameter) of the wire electrode 1 and the round bar jig 4 are particularly measured at the respective positions X1, X2, X3, and X4. , The upper surface 11 of the table 11 based on a plurality of (specifically, three) similar right-angled triangles having the inclined angle θ of the inclined state formed by the horizontal coordinate axis 12 of the upper guide 2 and the horizontal coordinate axis 13 of the lower guide 3. The distance DB between the upper guide 2 and the lower guide 3 and the distance DA between the table upper surface 11 and the lower guide 3, which are vertical distances, are measured.

  In the vertical guide position measuring method in this wire electric discharge machine, the position information obtained by measuring each position X1, X2, X3, X4 is obtained by rounding the wire electrode 1 extending perpendicularly to the table upper surface 11. Round bar jig diameter R detected by calculating the distance between the horizontal coordinate axes of the lower guide 3, that is, the measured positions X1 and X2, by contacting the circumferential ends 6 and 7 of the bar jig 4. The wire electrode 1 is brought into contact (point contact) with both circumferential end faces 8 and 9 of the round bar jig 4 facing in the circumferential direction in a state where the round bar jig cross section is a perfect circle. The round bar jig diameter projection distance Q, the round bar jig diameter R center coordinates and the round bar detected by calculating the distance between the horizontal coordinate axes of the lower guide 3, that is, the measured positions X3 and X4. Detected by calculating the distance between two points with the midpoint coordinate of the jig diameter projection distance Q The upper guide detected by measuring the distance W of the rod jig center projection and the distance by which the upper guide 2 is relatively moved to tilt the wire electrode 1 from the state in which the upper and lower guides 2 and 3 are perpendicular to the table upper surface 11. 2 is the inclination length, that is, the inclination distance U in the horizontal coordinate axis 12.

In the method of measuring the vertical guide position in this wire electric discharge machine, the measured value of the diameter R of the round bar jig 4 (X2-X1, and the measured value of the round bar jig diameter projection distance Q (X4-X3) are position measurement. The diameter r of the wire electrode 1 is sometimes added, so that the measured values of the diameter R of the round bar jig 4 and the projected diameter Q of the round bar jig take the diameter r of the wire electrode 1 into account. In other words, the diameter R of the round bar jig and the projected diameter Q of the round bar jig are calculated from the distance between the horizontal coordinate axes 13 of the lower guide 3 (X2-X1, X4-X3). The calculation value (r / cos θ) obtained by dividing the wire electrode diameter r by the constant (R / Q) obtained by dividing the diameter R of the rod jig by the round rod jig diameter projection distance Q is corrected by subtraction. Here, R / Q = cos θ.
That is, R = X2-X1-r / cos θ, Q = X4-X3-r / cos θ
Accordingly, the diameter R of the round bar jig R is 0, and the wire electrode 1 extending in the vertical direction with respect to the table upper surface 11 is placed on the circumferential end faces 6 and 7 facing the circumference of the round bar jig 4. It is corrected by dividing the diameter r of the wire electrode 1 from the distance between the horizontal coordinate axes of the lower guide 3 by making point contact. In addition, the method of measuring the vertical guide position in this wire electric discharge machine is a point contact between the peripheral end surfaces 6, 7, 8, 9 of the round bar jig 4 and the wire electrode 1 even if the inclination angle θ of the wire electrode 1 is changed. The state is constant, the measurement accuracy does not change without being affected by the inclination angle θ of the wire electrode 1, and a constant measurement accuracy can be ensured.

  In this method of measuring the vertical guide position in the wire electric discharge machine, the position X1, X2, X3 of the lower guide 3 of the wire electrode 1 on the horizontal coordinate axis 13 between the wire electrode 1 and the round bar jig 4 as a measurement jig. , X4 are measured. As described later, the diameter R of the round bar jig 4, the diameter projection distance Q of the round bar jig 4, and the round bar are input to the computer based on the measured position information. The jig center projection distance W can be calculated. Further, the inclination length, that is, the inclination distance U, which is the relative movement distance on the upper guide 2 of the wire electrode 1 can be detected by measuring the relative movement distance of the upper guide 2 with respect to the lower guide 3.

First, the diameter R, which is the width of the round bar jig 4, is added by the cosine (cos θ) of the diameter of the wire electrode 1 when the wire electrode 1 is tilted, so that only the cosine (cos θ) is added. Subtract. Here, when the diameter of the wire electrode 1 is r, it is as follows.
The diameter R of the round bar jig 4 is subtracted by r / cos θ from the measured value.
However, from the right triangle ΔABC, cos θ = R / Q.
Note that tan θ = P / R
Therefore, R = X2-X1-r / cos θ
When the wire electrode 1 is perpendicular to the horizontal coordinate axis 13 of the lower guide 3, since cos0 = 1, R = X2-X1-r.
Therefore, the diameter R of the round bar jig 4 is information that can be calculated from known numerical values X1, X2, and r.

The diameter projection distance Q of the round bar jig 4 is as follows.
Q = X4-X3-r / cos θ
= X4-X3-r · Q / R
Q.R = R (X4-X3) -r.Q Q (R + r) = R (X4-X3)
Therefore, Q = R (X4−X3) / (R + r) Therefore, the diameter projection distance Q of the round bar jig 4 is information that can be calculated from the known numerical values X3, X4, R, and r.

The projection distance W at the center of the round bar jig 4 is as follows.
First, the diameter midpoint C1 of the round bar jig 4 is (X1 + X2) / 2.
The diameter projection midpoint C2 of the round bar jig 4 is (X3 + X4) / 2.
Here, W is a numerical value obtained by subtracting the position of C1 from the position of C2.
Therefore, W = [(X3 + X4) / 2]-[(X1 + X2) / 2]
W = (X3 + X4-X1-X2) / 2
Therefore, the center projection distance W of the round bar jig 4 is information that can be calculated from the known numerical values X1, X2, X3, and X4.

P in the right triangle ΔABC shown in FIG. 2 is as follows.
From Pythagorean theorem, Q ² = R ² + P ² holds.
Therefore, P = (Q ² −R ² ) ^1/2
Therefore, the numerical value P in the right triangle ΔABC is information that can be calculated from the known numerical values Q and R.

Referring to FIG. 2, calculation formulas for calculating the distance DA between the table upper surface 11 and the lower guide 3 and the distance DB between the upper guide 2 and the lower guide 3 are as follows.
The right triangle ΔABC, the right triangle ΔDEF, and the right triangle ΔGHI each having an angle θ that is one inclination angle are similar right triangles.
AB = Q, AC = R, and BC = P for the length of each side in the right triangle ΔABC.
For the length of each side in the right triangle ΔDEF, DF = DA + R / 2, and EF = W.
For the length of each side in the right triangle ΔGHI, HI = U and IG = DB.

The distance DA between the table upper surface 11 and the lower guide 3 can be measured by the following information.
Since the right triangles ΔABC and ΔDEF are similar right triangles, the following equation holds.
R / P = (DA + R / 2) / W
DA + R / 2 = R · W / P
Therefore, DA = [R · W / P] −R / 2
Therefore, the distance DA between the upper guide 2 and the lower guide 3 is information that can be calculated from known numerical values R, W, and P, and can be measured by the wire electrode 1 and the round bar jig 4.

The distance DB between the upper guide 2 and the lower guide 3 can be measured with the following information.
Since the right triangle ΔABC and ΔGHI are similar right triangles, the following equation holds.
R / P = DB / U
DB / P = R / U
Therefore, DB = R · U / P
Therefore, the distance DB between the upper guide 2 and the lower guide 3 is information that can be calculated from the measured values R, U, and P, and can be measured by the wire electrode 1 and the round bar jig 4. As described above, DA and DB can be calculated from the measured values X1, X2, X3, X4 and the diameter r of the wire electrode 1.

The method for measuring the vertical guide position in this wire electric discharge machine can obtain each piece of information as described above only by having the wire electrode 1 and the round bar jig 4, and the numerical values of these pieces of information can be obtained from the controller. That is, the distance DA between the table upper surface 11 and the lower guide 3 and the distance DB between the upper guide 2 and the lower guide 3 can be calculated by inputting to the computer and calculating.
That is, each information is summarized as follows.
1. The required distance DA is the distance between the table upper surface 11 and the lower guide 3.
2. The required distance DB is the distance between the upper guide 2 and the lower guide 3.
3. The positions X1 and X2 on the lower guide horizontal coordinate axis of the wire electrode 1 can measure the positions of the peripheral surfaces of both peripheral end surfaces 6 and 7 of the round bar jig 4 with the wire electrode 1 being vertical.
4). The positions X3 and X4 on the lower guide horizontal coordinate axis of the wire electrode 1 are the positions of the peripheral surfaces of both peripheral end surfaces 8 and 9 of the round bar jig 4 with the wire electrode 1 set to an arbitrary predetermined inclination angle θ. Can be measured.
5. The round bar jig diameter midpoint C1 can be calculated by (X1 + X2) / 2.
6). The round bar jig diameter projection midpoint C2 can be calculated by (X3 + X4) / 2.
7). The diameter R of the round bar jig 4 is such that the wire electrode 1 extending perpendicularly to the table upper surface 11 is brought into point contact with the peripheral end surfaces 6 and 7 on the circumference of the round bar jig 4 in order to make contact between the lower guide horizontal coordinate axes. It can be detected by measuring the distance. At this time, since cos θ has an inclination angle of 0 °, cos θ = 1, and therefore R = X2-X1-r. Therefore, the diameter R of the round bar jig 4 can be calculated.
8). The distance between the center of the round bar jig and the lower guide 3 is DA + (R / 2).
9. Regarding the round bar jig diameter projection distance Q, the circumferential ends 8 and 9 on the circumference of the round bar jig 4 in a state where the wire electrode 1 is inclined by an angle θ in the direction in which the cross section of the round bar jig becomes a perfect circle. It is detected by measuring the distance between the lower guide coordinates with point contact. At this time, the round bar jig diameter projection distance Q can be measured by subtracting r / cos θ from the measured distance.
10. The distance W of the round bar jig center projection is detected by measuring the distance between the center coordinates of the round bar jig diameter R and the midpoint coordinates of the round bar jig diameter projection distance Q.
11. The movement distance U corresponding to the inclination of the wire electrode 1 is detected by measuring the distance that the upper and lower guides 2 and 3 move the upper guide 2 to incline the wire electrode 1 from the state perpendicular to the table upper surface 11. Is the inclination length on the horizontal coordinate axis 12.

  The method for measuring the vertical guide position in the wire electric discharge machine according to the present invention has been described in the first embodiment with reference to the right slope shown in FIGS. 1 and 2, but is not limited to the first embodiment. As shown in the second embodiment, it is also possible to select a left slope, a different tilt angle, and a different selection of similar right triangles.

With reference to FIG. 6, a second embodiment of the vertical guide position measuring method in the wire electric discharge machine according to the present invention will be briefly described.
In the second embodiment, similarly to the first embodiment, the wire electrode 1 is in a vertical state with respect to the table upper surface 11 (perpendicular to the horizontal coordinate axis 13 of the lower guide 3), and the circumferential surface 5 of the round bar jig 4 is used. , The positions X1 and X2 of the wire electrode 1 on the horizontal coordinate axis 13 of the lower guide 3 are measured, and the wire electrode 1 is placed on the table top surface. 11 is in contact with both opposing end surfaces 8, 9 of the circumferential surface 5 of the round bar jig 4 in an inclined state at an arbitrary angle with respect to 11 and a predetermined inclination angle θ ₂ (specifically, point contact). Thus, the respective positions X3 and X4 of the wire electrode 1 on the horizontal coordinate axis 13 of the lower guide 3 are measured. Further, the wire electrode 1 is inclined in the opposite direction by the inclination angle θ2, and the position X5 of the wire electrode 1 on the horizontal coordinate axis 13 of the lower guide 3 is measured.

Here, three right triangles ΔJKL, a right triangle ΔMNS, and a right triangle ΔTVZ are formed, and these right triangles are similar right triangles each having an angle θ ₂ that is one inclination angle.
For the length of each side in the right triangle ΔJKL, JK = Q, JL = R, and KL = P ₂ .
For the length of each side in the right triangle ΔMNS, MS = DA + R / 2 and NS = Y / 2.
For the length of each side in the right triangle ΔTVZ, VZ = U and TZ = DB.
Further, from ΔJKL, cos θ ₂ = R / Q, and from FIG. 6, a = DA + R / 2.
Tan θ ₂ = P ₂ / R
Therefore, D, Y, P ₂ , R, and Q are calculated as follows.
D = X1-X4
= X5-X2
Y = X5-X3
= X2 + D-X3
= X2 + X1-X4-X3
P ₂ is as follows from the Pythagorean theorem.
P ₂ ² = Q ² + R ²
Therefore, P ₂ = (Q ² + R ² ) ^1/2
R = X2-X1-r (where r is the diameter of the wire electrode 1)
Q = X3-X4-r / cos θ ₂
= X3-X4-r · Q / R
Therefore, Q = R (X3-X4) / (R + r)
= (X2-X1-r) (X3-X4) / (X2-X1)
From the similar right triangle ΔJKL and right triangle ΔMNS, the following equation holds.
a / (Y / 2) = R / P ₂
Therefore, a = R · Y / (2 · P ₂ )
From the above formula, a = DA + R / 2
Therefore, DA = a−R / 2
_{= R (Y-P 2)} / (2 · P 2)
From the similar right triangle ΔJKL and right triangle ΔTVZ, the following equation holds.
DB / U = R / P ₂
Therefore, DB = R · U / P ₂
As described above, DA and DB can be calculated from the measured values X1, X2, X3, X4, X5 and the diameter r of the wire electrode 1.

  The method of measuring the vertical guide position in the wire electric discharge machine according to the present invention is to move the upper guide and the lower guide to a predetermined specified angle when, for example, the workpiece is tapered with the wire electrode inclined. In addition, the present invention can be easily applied to the case where a predetermined position where the upper guide and the lower guide are set based on the necessary table upper surface is measured.

DESCRIPTION OF SYMBOLS 1 Wire electrode 2 Upper guide 3 Lower guide 4 Round bar jig 5 Circular surface 6,7 Vertical contact peripheral end surface 8,9 Inclined contact peripheral end surface 10 Table 11 Table upper surface 12 Horizontal coordinate axis of upper guide 13 Horizontal coordinate axis θ of lower guide , Θ ₂ Tilt angle of wire electrode X1 Vertical position of wire electrode at one end of round bar jig X2 Vertical position of wire electrode at the other end of round bar jig X3 Wire at one end of round bar jig Projection position of electrode X4 Projection position of wire electrode on the other end side of the round bar jig X5 Projection position of wire electrode on one end side when the round bar jig is reversely tilted DA Between the upper surface of the table and the lower guide surface Distance DB Distance between upper guide surface and lower guide surface Q Round bar jig diameter projection distance R Round bar jig diameter U Upper guide travel distance W Round bar jig center projection distance

Claims (7)

The upper surface of the table and the lower guide are formed using a wire electrode guided and supplied to an upper guide and a lower guide positioned below the upper guide, and a measurement jig attached to the workpiece mounting table. In the method of measuring the upper and lower guide positions in a wire electric discharge machine comprising measuring the distance between the upper guide and the lower guide
Use a round rod jig as a circular jig as the measurement jig fixed to the upper surface of the table,
The wire electrode is brought into contact with a circumferential end surface of the round bar jig in a vertical state with respect to the table upper surface and a predetermined inclination angle, and a horizontal coordinate axis of the lower guide. Measuring each position of the wire electrode;
A similar right triangle having the inclination angle formed by the wire electrode, the diameter and midpoint of the round bar jig, the horizontal coordinate axis of the upper guide, and the horizontal coordinate axis of the lower guide at the time of measuring each of the positions. And calculating and measuring the distance between the upper guide and the lower guide that is perpendicular to the table upper surface, and the distance between the table upper surface and the lower guide. A method for measuring a vertical guide position in a wire electric discharge machine.   The measured information on the horizontal coordinate axis of the lower guide is obtained by bringing the wire electrodes extending perpendicularly to the table upper surface into contact with the opposing peripheral end surfaces on the circumference of the round bar jig, respectively. The diameter of the round bar jig detected by calculating the distance between the horizontal coordinate axes of the lower guide, and the wire electrode tilted by the tilt angle in the direction in which the cross section of the round bar jig is a perfect circle The round bar jig diameter projection distance detected by calculating the distance between the horizontal coordinate axes of the lower guide by contacting the opposing peripheral end surfaces on the circumference of the round bar jig, and the upper and lower guides are The distance of the inclination of the upper guide on the horizontal coordinate axis detected by measuring the distance that the upper guide is relatively moved in order to incline the wire electrode from a state perpendicular to the upper surface of the table. Item 1 Vertical guide position measuring method in a wire electric discharge machine.   The measured information includes the round bar jig center projection detected by calculating the distance between the center coordinates of the round bar jig diameter and the midpoint coordinates of the round bar jig diameter projection distance. The vertical guide position measuring method in the wire electric discharge machine according to claim 2, wherein the distance is a distance.   The measured information includes the distance detected by calculating the distance on the wire electrode in the inclined state by the diameter of the round bar jig and the inclination angle, and the wire electrode in the inclined state of the inclination angle The method for measuring the vertical guide position in a wire electric discharge machine according to claim 2, wherein the distance is a distance detected by calculating a distance between the horizontal coordinate axes of the lower guide and the wire electrode in a reversely inclined state.   The round bar jig diameter and the round bar jig diameter projection distance are calculated by dividing the wire electrode diameter by a constant obtained by dividing the diameter of the round bar jig by the round bar jig diameter projection distance. The vertical guide position measuring method in the wire electric discharge machine according to claim 2, wherein the correction is performed by subtracting from the distance between the horizontal coordinate axes of the lower guide.   Corresponding to the inclination angle of the wire electrode, it is possible to ensure the contact state between the peripheral end surface on the circumference of the round bar jig and the wire electrode, and correct the measured value according to the inclination angle of the wire electrode. 6. The method for measuring the vertical guide position in the wire electric discharge machine according to claim 2, wherein a certain measurement accuracy can be ensured.   The diameter of the round bar jig is determined from the distance between the horizontal coordinate axes of the lower guide by bringing the wire electrode extending perpendicularly to the upper surface of the table into contact with the peripheral end surface on the circumference of the round bar jig. The method for measuring the vertical guide position in the wire electric discharge machine according to any one of claims 2 to 6, wherein the correction is performed by reducing the wire electrode diameter.

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