JPH01257525A - Wire cut electric discharge machining - Google Patents

Abstract

PURPOSE:To prevent the occurrence of an input error in a distance between a table surface and an upper guide and to facilitate control of an input by a method wherein based on position data of an upper guide read from an NC program during electric discharge machining, a height from a table surface to a guide surface is computed and taper data is computed. CONSTITUTION:If the value of a distance T-U between the table surface and the guide surface of an electric discharge machine is stored in a memory on the NC device side, The T-U value is calculated to calculate taper data. Electric discharge machining is performed, and when a section shaft is moved in the middle of machining, calculation of the T-U value and calculation of the taper data are performed again to continue machining. When the T-U value is not stored, a difference between a position at the lowermost point and a position at the lowermost point of a Z-axis is stored in the memory of the NC device. Calculation of the T-U value and calculation of the taper data are performed in a similar manner described above to perform electric discharge machining, and when the Z-axis is moved, calculation of the taper data is executed according to the movement.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a wire cut electric discharge machining method.

[Prior Art] A conventional wire-cut electric discharge machine calculates the T-U value (distance between the table surface and the upper guide) used as taper data before executing the NC program (before performing electric discharge machining). l11) is input by the processing worker via a keyboard or the like.

[Problems to be Solved by the Invention] In the conventional apparatus described above, the T-U value is input every time electric discharge machining is performed, so the input operation is complicated, and
There is a problem in that an error in inputting the TU value occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire-cut electrical discharge machining method in which input errors of the TU value do not occur and the input operation of the TU value is easy.

[Means for Solving the Problems] The present invention provides for, during wire cut electrical discharge machining, - reading the position data of the upper guide from an NC program, and determining the height from the table surface to the guide based on the read data. , and calculates taper data.

[Function] The present invention reads the north guide 1' position ffl data from the NC program during wire cut electrical discharge machining, and calculates the height from the table surface to the above-mentioned -1- guide based on this read data. , because the taper data is calculated, there is no possibility of input errors in the T-U value, and the T-U
It is easy to input values.

[Example] FIG. 1 is a flowchart showing an example of the present invention.

First, turn on the power and determine whether the Z-axis moves automatically or manually. If the distance to the upper guide) is stored in the memory of the NC (numerical calculation) device (S2), a T-U value is calculated and taper data is calculated (S3).

In other words, the T-U value is calculated by adding the difference (distance # between the upper guide and the table surface when the north guide is set at the lowest point) to the machine coordinate value, and the distance between the upper guide and the table surface is calculated. By adding the distance between the table surface and the lower guide, the distance between the upper guide and the lower guide is determined, and from this and the angle, the amount of movement of the U and V axes in the horizontal plane is determined. In other words, taper data is calculated. The above angle is written in the NC program, so all you have to do is read it.

Then, electric discharge machining is performed (S4), and if there is movement of the Z axis during this machining, the process returns to S3, the T-U value calculation and the taper data calculation are performed again, and the machining is continued.

On the other hand, if there is no movement in the two axes during machining (S5), machining continues as is.

By the way, if the T-U value is not stored in the memory on the NC side in S2, one of the initial operations of the electrical discharge machine is to check that the Z-axis has not reached its lowest point (S11
), if the above Z-axis had not reached the top point (
S12) Perform error processing.If the Z-axis has reached both the lowest point and the highest point in the above initial operation, the position of the lowest point of the Z-axis, the position of the highest point, and the difference ( The distance between the table surface and the -1- guide when the upper guide is at its lowest point is stored in the memory of the NC system (S13).

Then, T-U value calculation and taper data calculation are performed in the same manner as above, and electrical discharge machining is performed. If the Z-axis moves, Taber data calculation is performed in accordance with the movement (33 to S5).

By doing as described above, there is no need for the machining worker to input the TU value before electrical discharge machining, so there is no need to worry about the operation being complicated or forgetting to input the TU value.

The taper data includes the distance from the table surface to the upper guide, the thickness of the workpiece, the distance from the table surface to the program surface, and the distance gI (from the table surface to the lower guide).
fixed).

On the other hand, when manually moving the Z axis in Sl, the upper guide height is manually input (S21).
Perform the same operations as before.

The above embodiments apply not only to cases where there is one type of NC program and one type of workpiece thickness, but also to cases where there are two types of NC programs and two or more types of workpiece thicknesses. Processing can be performed automatically and continuously. Therefore, even when electrical discharge machining is performed on workpieces with different thicknesses, the process can be performed automatically.
It can be unmanned.

In addition, in conjunction with the up and down of the Z axis, the change in T-U value is
The actual T-U value may be displayed on a display such as T.
-W (plate thickness data), T-PROG (program surface height), etc. can be easily compared with other taper data.

Furthermore, by determining the distance from the lower guide to one program surface, and determining the distance from the lower guide to the other program surface, it is possible to machine a shape in which the top and bottom shapes are different from each other and the top and bottom are the same -R. .

[Effects of the Invention] According to the present invention, there is an effect that input errors of the TU value do not occur and the input operation of the TU value is easy.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing one embodiment of the present invention. I! I4f fraudulent applicant Sodick Co., Ltd. agent
Arata Yokubo - Figure 1

Claims (3)

[Claims] (1) During wire cut electrical discharge machining, the position data of the upper guide is read from the NC program, and based on this read data, the height from the table surface to the upper guide is calculated, and the taper data is calculated. Characteristic wire cut electrical discharge machining method. (2) In claim (1), even when the Z-axis is moved during wire cut electric discharge machining, the distance between the table surface and the upper guide is calculated according to the position of the upper guide at that time. A wire cut electrical discharge machining method characterized by: (3) The wire-cut electrical discharge machining method according to claim (2), characterized in that the distance between the table surface and the upper guide is displayed on a predetermined display means in conjunction with the vertical direction of the Z-axis.