CN1171695C - Vertical correction method and device for wire-cut electric discharge machine - Google Patents

Abstract

A vertical correction method and device for a wire-cut electric discharge machine, the device comprising a main body, an upper correction plate and a lower correction plate fixed on the main body and parallel to a bed, the upper and lower correction plates each having a circular ring, the two circular rings having concentric axes; a line passing through the two circular rings passes through the centers of the two circular rings found by the line contacting the circular rings, i.e. a vertical line; using the known radii of the two circular rings, the known heights of the two circular rings relative to the bed surface, the known cone angles of the two concentric circular rings, and the movement amount from the vertical position to the previously found edge position, the heights of the upper and lower machine heads can be calculated respectively using formulas containing only one variable.

Description

Vertical correction method and device for wire-cut electrical discharge processing machine

technical field

The invention relates to a wire-cut electric discharge machine, in particular to a method and a device for vertically correcting the wire-cut electric discharge machine and measuring the height of the upper and lower heads.

Background technique

The automatic vertical correction device of the known wire-cut electric discharge machine is as shown in Figure 1, the PX1 face of the upper calibration board 2 of the automatic vertical calibration device 1 among the figure and the PX2 surface of the lower calibration board 3 are on the same plane, and the upper calibration board 2 The PY1 surface and the PY2 surface of the lower school board 3 are on the same plane. The upper calibration board 2 and the lower calibration board 3 are insulated and fixed on the main body 7 . The planes PX1 and PX2 are perpendicular to the planes PY1 and PY2, and both are perpendicular to the bottom of the main body 7 and to the horizontal platform (not shown). The vertical correction method is to install the automatic vertical correction device 1 on the bed so that the PX1 and PX2 surfaces are parallel to the X axis, and the PY1 and PY2 surfaces are parallel to the Y axis. Use the machine to drive the (copper) wire to move, and give the wire tension state, first obtain the simultaneous contact points on the PX1 surface and PX2 surface in the X and U directions, or first obtain the simultaneous contact points on the PY1 surface and PY2 surface in the Y and V directions Then do the same action in the other direction to obtain the simultaneous contact points up and down; thus, the position of the vertical line is obtained.

However, the method for accurately measuring the height of the upper head and the lower head of the wire-cut EDM using the known automatic vertical correction device 1 of the wire-cut EDM in FIG. 1 is shown in FIG. 2 . 4 is (copper) wire among Fig. 2, and 5 is upper die, and 6 is lower die, and as shown in the figure, line 4 just is positioned at the position that uses above-mentioned method to obtain vertical line. To obtain the distance x between the upper machine head 5 and the bed platform and the distance y between the lower machine head 6 and the bed platform, it can be realized by the following method: first, move the upper machine head 5 away from the vertical correction device 1 by a distance in the X and U directions. e, as shown by the inclined line 4', then the upper and lower machine heads 5, 6 move in parallel at a constant speed in the direction of the vertical correction device 1 based on the inclined line 4', so that the line is in contact with the lower calibration plate 3 of the vertical correction device 1, In this way, the inclined line 4' has moved a d distance to reach the position of the inclined line 4 "; when the upper and lower heads 5, 6 and the line 4 return to the vertical position shown, then move the lower head 6 to leave the vertical position in the same way. When the calibration device 1 is at a distance e, the contact point with the upper calibration plate 2 of the vertical calibration device 1 can be found on the inclined line, as shown by the inclined line 4 "', and the moving distance c can be obtained. From the triangular relationship in Figure 2, we can get:

x＝[a(c-e)+b(e-d)]/(c-d) ……(1)

y = (BD-AC)/(C-D) ... (2)

Among them, a, b, and e are known, and c, d are the moving distances after the moving inclined line touches the upper calibration board 2 and the lower calibration board 3 respectively, so the distance x between the upper machine head 5 and the bed platform can be obtained and the lower machine head 6 The distance y from the bed platform.

However, this known device and method for vertical correction of a wire-cut electric discharge machine has the following disadvantages: (1) the vertical correction device 1 must be installed parallel to the bed, otherwise it must be repeatedly corrected in the X and Y directions, In order to converge to the vertical position, it is not easy to install parallel to the bed platform, and the inaccurate vertical position will also affect the calculation error of the position of the upper and lower heads; (2) Calculate the positions of the upper and lower heads 5 and 6 x, Both c and d variables are included in the y calculation formula, and the inaccurate measurement of c and d will easily cause the amplification of x and y calculation errors.

Contents of the invention

The object of the present invention is to provide a vertical correction device and method for a wire-cut electric discharge machine, which can solve the problem that the vertical correction device is parallel to the bed by using two concentric rings with different diameters up and down, and increase the measurement speed with accuracy.

Another object of the present invention is to provide a device and method for measuring the height of the upper and lower heads of a wire-cut electric discharge machine, using two concentric shaft rings with different diameters up and down, and using the known cone angle of the rings to make Calculate the height of the upper and lower machine heads and increase the measurement accuracy.

The measurement procedure proposed by the present invention can avoid the opportunity of the copper wire surface being scraped off by the calibrator to avoid affecting the calibration accuracy.

The above object of the present invention is achieved in this way: a vertical correction device for a wire-cut electric discharge machine, comprising: a main body with a flat bottom surface and each side; A side of the main body and an upper school plate parallel to the bottom surface of the main body; and a lower school plate having a hollow lower ring fixed on the side surface of the main body and parallel to the bottom surface of the main body; wherein, The upper ring and the lower ring have concentric axes and are located on different planes, and the vertical correction device can cooperate with the controller of the processing machine to detect the contact between the wire and the upper ring or the lower ring.

It can be seen that a vertical correction device for a wire-cut electric discharge machine provided by the present invention includes: a main body with a flat bottom surface; an upper calibration board and a lower calibration board that are insulated and fixed to one side of the main body and parallel to the flat bottom surface of the main body, There is an upper ring on the upper calibration board, and a lower ring on the lower calibration board. The upper ring and the lower ring are concentric circles with different diameters; this vertical correction device can cooperate with the controller of the processing machine to detect whether the line is consistent with the Ring contacts. When in use, fix the device on the bed, because the upper and lower calibration boards are concentric rings, so you can move the wire and the upper ring without considering the directionality. The contact action with the lower ring calculates the center of the upper ring and the lower ring, and completes the vertical correction of the line. The device and method increase the speed and accuracy of measurement.

After correcting the verticality, because the height of the lower ring, the height of the upper ring, the radius of the lower ring, the radius of the upper ring, and the cone angles of the two concentric rings are all inherent data measured in advance, and the guide The formula for obtaining the height of the upper machine head contains only one measurement variable of the movement amount from the vertical position to the previous edge-seeking position, and the formula for the height of the lower machine head also contains only one measurement variable of the movement amount from the vertical position to the previous edge-seeking position , so compared with the known formulas for finding the height of the upper and lower noses and finding the height of the lower nose, there are fewer variables, so when the device and method of the present invention obtain the heights of the upper and lower noses, it is possible to prevent the The calculation by solving the simultaneous equations amplifies the errors, and the invention can improve the measurement accuracy.

In another embodiment of the present invention, the known device is improved, and the upper calibration board (the second calibration board) and the lower calibration board (the first calibration board) are originally on the same plane, and a part of one of them is made to be in line with the other The original same plane person on a school board becomes different planes but still parallel to each other, so this part can be utilized, and the method of the present invention is used to find the height of the upper and lower heads.

That is to say, another solution of the present invention is: a vertical correction device for a wire-cut electric discharge machine, comprising: a main body with a flat bottom surface and each side; a first calibration plate fixed on one side of the main body , which is parallel to the bottom surface of the main body, has a first surface and a second surface perpendicular to the bottom surface of the main body on the first school plate, and the first surface and the second surface are also perpendicular to each other; and a second The school board is fixed on the side of the main body, parallel to the bottom surface of the main body, and has a third surface and a fourth surface perpendicular to the bottom surface of the main body on the second school board, and the third surface is parallel to the bottom surface of the main body. The first surface is on the same plane, and the line can be used to contact the first surface and the third surface at the same time; the fourth surface is on the same plane as the second surface, and the line can be used to contact the second surface and the third surface. The fourth surface is in contact at the same time; on the second calibration board, there is also a fifth surface parallel to the first surface but not on the same plane as the first surface, and the line can be used to connect with the first surface and the fifth surface Simultaneous contact; wherein the vertical calibration device can cooperate with the controller of the processing machine to detect the contact between the wire and the surfaces on the first calibration board and the second calibration board.

Another object of the present invention is achieved in that a method for vertical correction of a wire-cut electric discharge machine comprises the following steps:

a. A ring-type detection device is set, including an upper ring and a lower ring parallel to the bed platform, and the two rings have concentric axes, so as to detect whether the thread is in contact with the upper ring or the lower ring;

b. Pass the thread through the upper and lower rings, and then start the thread tension so that the thread does not touch any ring; and

c. The line of the moving machine platform is in contact with the upper ring and the lower ring respectively multiple times, and the centers of the upper ring and the lower ring are obtained, and the line passes through these centers.

The vertical correction method of the wire-cut electrical discharge machine according to the present invention, wherein the step c of moving the machine table to contact the wire with the upper ring and the lower ring to obtain the center of the circle may include:

c1. Move the machine along the Y, V (or X, U) axis first, find the points where the line touches the upper ring and the lower ring respectively, and then move along the Y, V (or X, U) Move in the opposite direction of the axis, find and record the points where the line touches the upper ring and the lower ring respectively, and then move the line to the midpoint of the secondary contact point; and

c2. Move the machine along the X, U (or Y, V) axis directions, find the point where the line touches the upper ring and the lower ring respectively, and then move along the X, U (or Y, V) axis Move in the opposite direction, find and record the point where the line is in contact with the upper ring and the lower ring respectively, and move the line to the midpoint of the secondary contact point.

The purpose, advantages and technical features of the present invention will be described in further detail below in conjunction with the drawings shown in the embodiments, and the same reference numerals in each drawing represent corresponding parts.

Description of drawings

Fig. 1 is the schematic diagram of known vertical correction device;

Fig. 2 is a graphic illustration of the calculation of the upper and lower machine head positions by the known vertical correction device in Fig. 1;

3 is a schematic diagram of an embodiment of the vertical correction device of the present invention;

Fig. 4 is a schematic diagram of an embodiment of the vertical correction device of the present invention, a skew line passing through two concentric circles with different diameters up and down before correction;

Fig. 5A is an embodiment of the vertical correction device of the present invention. The correction process is an explanatory diagram for finding contact points in the Y and V directions, wherein (b) is a perspective view, and (a) is a top view;

Fig. 5B is an embodiment of the vertical correction device of the present invention. The correction process is an explanatory diagram for finding contact points in the X and U directions, wherein (b) is a perspective view, and (a) is a top view;

Fig. 6 is an embodiment of the vertical correction device of the present invention, a graphical illustration of calculating the position of the upper and lower heads;

FIG. 7 is a schematic diagram of another embodiment of the vertical correction device of the present invention.

Detailed ways

Please refer to FIG. 3 , which is a schematic diagram of an embodiment of a vertical correction device for a wire-cut electric discharge machine according to the present invention. The vertical correction device 1a includes a main body 7a, which is insulated from the main body 7a and fixed on the main body 7a in parallel with the bed platform. The upper calibration board 2a and the lower calibration board 2b, the upper calibration board 2a has a ring C1, and the lower calibration board 2b has a ring C2, The ring C1 and the ring C2 are concentric circles with different diameters. In this embodiment, the radius of the ring C1 is R, the radius of the ring C2 is r, and R>r; the vertical correction device 1a can Cooperate with the controller (not shown) of the processing machine to detect whether the wire is in contact with the ring C1 or C2.

When using this vertical correction device 1a to carry out the vertical correction of the line and the calculation of the position of the upper and lower machine heads, the vertical correction device 1a is first fixed on the bed platform (not shown), the upper calibration board 2a and the lower calibration board 2b are parallel to the bed platform, and The ring C1 and the ring C2 fall within the travel range of the machine. Adjust the Z-axis height of the machine to the top of the vertical correction device 1a, so that it can move to an appropriate position based on the principle of not colliding with the vertical correction device 1a. Move the machine table to the position of the concentric axis circle C1 and circle C2, thread the thread, as shown in Figure 4, the upper machine head 5 is above the circle C1, the lower machine head 6 is below the circle C2, and the thread 4 passes through the two Concentric axis rings C1 and C2; start the wire tension, the wire 4 is not in contact with the rings C1 and C2.

Start the automatic vertical correction program, first as shown in Figure 5A, where (b) is a three-dimensional view, (a) is a top view, the machine first moves in the direction of the Y and V axes, and finds the line 4 and the rings C1 and C2 Record the point positions P1 and Q1 that are in contact, and then move in the opposite direction of the Y and V axes to find another point position P2 and Q2 where the line 4 is in contact with the rings C1 and C2 respectively, and record it; then move to the midpoint Location. Then as shown in Figure 5B, wherein (b) is a perspective view, (a) is a top view, the machine moves in the direction of the X and U axes, and finds the point position P3 where the line 4 contacts the rings C1 and C2 and Q3, record it, then move in the opposite direction of the X and U axes, find another point position P4 and Q4 where the line 4 is in contact with the rings C1 and C2 respectively, record it; and then move to the midpoint position. These midpoint positions are the axis positions of the concentric rings C1 and C2, that is, the vertical positions of the lines.

Of course, the positions of the centers of the concentric rings C1 and C2 can also be obtained by calculating the centers of the circles from three points. In order to improve the accuracy of vertical correction, four points can be used to find the center of the circle or the center of the circle can be measured several times, and then an average value can be obtained.

In order to minimize the contact time between the wire 4 and the vertical correction device 1a and reduce the chance of scraping debris, the step of finding simultaneous contact with the upper ring C1 and the lower ring C2 can be completed in the following way. Now take the line 4 moving in the positive direction of the X axis as an example to explain as follows:

(1) Line 4 approaches the two rings C1 and C2 in the positive direction at a set speed on the X and U axes at the same time, until it detects that it touches any of the rings, it stops, and the recorded touch position is the upper ring C1 Or the lower circle C2;

(2) If it touches the lower ring C2, the line 4 will leave the lower ring C2 at a set speed in the negative direction of the X axis; if it touches the upper ring C1, the line 4 will leave the lower ring C2 at a set speed in the negative direction of the U axis. Set the speed to leave the upper ring C1 until it is out of contact with the ring;

(3) If the previous touch position is the lower ring C2, move the positive direction of the U-axis to approach the two rings at a set speed; if the previous touch position is the upper ring C1, move the positive direction of the X-axis Approach the two rings at a set speed until they come into contact with the rings and stop, and record whether the touched position is the upper ring C1 or the lower ring C2;

(4) If the touch position is the lower ring C2, the X-axis will leave the lower ring C2 at a set speed in the negative direction; if the touch position is the upper ring C1, the U-axis will leave the lower ring C2 at a set speed in the negative direction Go up the ring C1 until it is out of contact with the ring;

(5) Determine the touch position in step (3). If it is the upper ring C1 or lower ring C2 as the previous touch position, return to step (3) and execute again. The position and the previous touch position are exchanged for the upper and lower rings, and the action of finding the ring position is completed;

(6) Repeat steps (1) to (5) several times (depending on the required accuracy), and slow down the moving speed each time, so that the line 4 and the upper and lower rings C1 and C2 can be found Simultaneous contact position.

The same method is applied in the negative direction of the X axis, the positive direction of the Y axis, and the negative direction of the Y axis, and the position where the line 4 contacts the upper and lower rings C1 and C2 simultaneously can be found. In these steps, the copper wire 4 is in contact with the upper and lower rings C1 and C2 for the shortest time, and there is no pressure between the wire and the rings, thus reducing the chance of scraping debris.

After the vertical position of the calibration line is completed, the upper and lower machine head positions can then be calculated. As shown in Figure 6, the data shown in the figure can be obtained after vertical correction, where a is the height of the lower ring C2, b is the height of the upper ring C1, R is the radius of the upper ring C1, and r is the lower ring C2 The radius and angle θ are half of the conical angle of the two concentric rings, which are the inherent data measured in advance by the vertical correction device 1a. The values of c and d can be detected by the movement amount of the controller of the wire-cut electric discharge machine after the vertical correction is completed. That is to say, it is known from the moving amount from the vertical position to any position of the previous edge finding, so the heights x, y of the upper and lower heads 5, 6 can be calculated by the following formula

x＝b+(d-R)/tan(θ)                                                                                                                          ... (3)

y = (R-C)/TAN (θ) -a ... (4)

Finding x value in above-mentioned formula (3) only contains a variable d, but finds x value but contains two variables c, d in known formula (1), finds y value only contains a variable in above-mentioned formula (4) c, but in known formula (2), find y value but contain two variable c, d, therefore the height x, y of upper and lower machine head 5,6 obtained by device and method of the present invention can prevent because of solution simultaneous equation calculation However, the error is amplified, so the device and method of the present invention increase the measurement accuracy compared with the known devices and methods.

In the last embodiment, the radius R of the upper annulus C1 is designed to be greater than the radius r of the lower annulus C2, but in the embodiment, it can also be designed that the radius of the upper annulus C1 is smaller than the radius of the lower annulus C2, or both The same radius as the one.

The present invention utilizes known inclination angles to measure the heights of the upper and lower heads 5, 6, which can be implemented in another embodiment. In the embodiment of Fig. 7, the PX1 surface of the upper calibration plate 2b on the main body 7b of the automatic vertical correction device 1b and the PX2 surface of the lower calibration plate 3b are on the same plane, and the PY1 surface of the upper calibration plate 2b and the PY2 surface of the lower calibration plate 3b are On the same plane; PX1, PX2 planes are perpendicular to PY1, PY2 planes, and both are perpendicular to the bed platform (not shown). The PX3 plane of the upper school board 2b is not on the same plane as the PX2 plane of the lower school board 3b, but is parallel to the PX2 plane; parallel.

When using this automatic vertical correction device 1b to carry out automatic vertical correction of the wire-cut electric discharge machine and measure the height of the upper and lower heads 5, 6, first make the PX1 surface and the PX2 surface parallel to the X-axis of the bed, and the PY1 surface , PY2 surface is parallel to the Y-axis of the bed, use the machine to drive the (copper) wire to move, and give the wire tension state, first obtain the PX1 surface and PX2 surface at the same time in the X and U directions. Obtain the simultaneous contact points of the PY1 surface and the PY2 surface in the V direction, and then perform the same action on the other direction to obtain the simultaneous contact points of the upper and lower sides, that is, obtain the position of the vertical line, which is the same as the known method. But when measuring the height of the upper and lower heads 5,6, then the method of the present invention can be utilized, because when the line 4 was in contact with the PX3 surface of the upper calibration plate 2b and the PX2 surface of the lower calibration plate 3b respectively simultaneously, the inclined line 4 The included angle with the vertical line is known, so formula (3) and formula (4) can be used to find the x and y values. In addition, the PY3 surface of the upper calibration board 2b and the PY2 surface of the lower calibration board 3b can also be used to measure the heights of the upper machine head 5 and the lower machine head 6 .

In this embodiment, only one of the concave surface PX3 and the PX3 surface can be manufactured, and it can be manufactured on the upper calibration plate or the lower calibration plate.

The vertical correction method and device of the wire-cut electric discharge processing machine of the present invention utilize two parallel concentric rings with different radii, the upper and lower rings, and each of the two rings has detection points to input data into the controller of the processing machine. The detection device finds the center position of the upper and lower rings, that is, the vertical position of the line, which eliminates the directional factor, and does not need to be parallel or perpendicular to the axial direction like the traditional device, so as to reduce the error of correction, so The device and method of the present invention increase measurement speed and accuracy. This device utilizes the known radii of the two rings, the known heights of the two rings relative to the bed table, a known concentric cone angle, and the amount of movement from the vertical position to any position of the previous edge finding. That is to say, the position of the upper and lower machine heads can be calculated with one equation, and there is only one variable in the calculation formula, which can reduce the amplification of calculation errors, so the device and method of the present invention can improve the measurement accuracy.

Although the present invention has been described through the embodiments, it should be understood that without departing from the broad spirit and viewpoint defined in the scope of claims of the present invention, various changes or modifications should belong to the scope of the present invention.

Claims (7)

1. A vertical correction device for a wire-cut electric discharge machine, comprising: a body having a flat bottom and sides; an upper school plate having a hollow upper ring fixed thereon to one side of the main body and parallel to the bottom surface of the main body; and a lower school plate having a hollow lower ring fixed thereon to the side of the main body and parallel to the bottom surface of the main body; Wherein, the upper ring and the lower ring have concentric axes and are located on different planes, and the vertical correction device can cooperate with the controller of the processing machine to detect the contact between the wire and the upper ring or the lower ring. 2. The vertical calibration device of a wire-cut electric discharge machine as claimed in claim 1, wherein the upper calibration board and the lower calibration board are insulated and connected to the main body. 3. The vertical correction device of a wire-cut electric discharge machine as claimed in claim 1, wherein the upper ring and the lower ring have different diameters. 4. A vertical correction method for a wire-cut electric discharge machine, comprising the following steps: a. A ring-type detection device is set, including an upper ring and a lower ring parallel to the bed platform, and the two rings have concentric axes, so as to detect whether the thread is in contact with the upper ring or the lower ring; b. Pass the thread through the upper and lower rings, and then start the thread tension so that the thread does not touch any ring; and c. The line of the moving machine platform is in contact with the upper ring and the lower ring respectively multiple times, and the centers of the upper ring and the lower ring are obtained, and the line passes through these centers. 5. The vertical correction method of wire-cut electric discharge machine as claimed in claim 4, wherein the step c moves the machine table and contacts the line with the upper ring and the lower ring to obtain the center of circle comprising: c1. Move the machine along the Y, V or X, U axis first, find the point where the line is in contact with the upper ring and the lower ring respectively, and then move along the Y, V or X, U axis in the opposite direction Move, find and record the point where the line is in contact with the upper ring and the lower ring respectively, and then move the line to the midpoint position of the secondary contact point; and c2. Move the machine table along the X, U or Y, V axis direction, find the point where the line is in contact with the upper ring and the lower ring respectively, and then move along the X, U or Y, V axis in the opposite direction, Find and record the points where the line touches the upper and lower rings respectively, and move the line to the midpoint of the secondary contact point. 6. The vertical calibration method of a wire-cut electric discharge machine as claimed in claim 5, wherein the step of moving the machine table to contact the wire with the upper ring and the lower ring respectively comprises: d1. The line approaches the two rings at a set speed along the Y, V or X, U axes at the same time, until it detects that it touches any of the rings, it stops, and the recorded touch position is the upper ring or the lower circle; d2. If it touches the lower ring, the line leaves the lower ring at a set speed in the opposite direction of the Y or X axis; if it touches the upper ring, the line moves along the V or U axis Leave the upper ring at a set speed in the opposite direction until it is out of contact with the ring; d3. If the previous touch position is the lower ring, move the V or U axis to approach the two rings at a set speed; if the previous touch position is the upper ring, move the Y or X axis Approach the two rings at a set speed until it comes into contact with the rings and then stop, and record whether the touch position is the upper ring or the lower ring; d4. If the touch position is the lower ring, the Y or X axis will leave the lower ring at a set speed in the opposite direction; if the touch position is the upper ring, the V axis will leave the lower ring at a set speed in the opposite direction Leave the upper ring until it is out of contact with the ring; d5. Determine the touch position in step d3. If it is the same as the upper ring or the lower ring as the previous touch position, return to step d3 and execute again. If the touch position in step d3 is the same as the previous touch If the touch position is exchanged for the upper and lower rings, the action of finding the ring position is completed; and d6. Repeat step d1 to step d5 several times, each time slowing down the moving speed, so that the position where the line contacts the upper and lower rings at the same time can be found. 7. the vertical correction method of wire-cut electrical discharge machine as claimed in claim 5, wherein when carrying out calculating upper and lower head position, be to utilize following formula: x=b+(d-R)/tan(θ) y=(r-c)/tan(θ)-a Where x is the height of the upper nose; y is the height of the lower nose; a is the height of the lower ring; b is the height of the upper ring; R is the radius of the upper ring; r is the radius of the lower ring; θ is half the angle of the cone angle of the two rings; c is the movement amount of the lower machine head from the vertical position to the edge-seeking position in the previous step c2; d is the movement amount of the upper machine head from the vertical position to the edge finding position in the previous step c2.

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