JPS63174847A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To perform stable high-precise machining, by a method wherein the weight of a workpiece is detected, a correction amount responding to a detecting value is read from a correction amount memory means, and an NC program is corrected by a deformation amount of a cross table. CONSTITUTION:When a cross table 2, on which to place a workpiece 1, is driven with the aid of X-and Y-axis motors 32 and 33, a starting current proportioning the weight of the placed workpiece 1 flows through the motors 32 and 33, and it is found that the starting current also proportions a deformation amount of the cross table 2 produced by dint of the weight of the workpiece 1. Thus, the current value is compared with a current value stored in a correction data memory 55, a correction value of the cross table 2, responding to the current value, is decided, and after correction of an NC program is effected according to the correction value, shifting to machining is effected. As a result, stable high-precise machining can be performed irrespective of a deformation amount of the cross table 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tlit processing apparatus, particularly to a cross table deformation correction means.

[Conventional technology]

FIG. 4 is a blow diagram showing, for example, a conventional electric discharge machining device. In the figure, (1) is the workpiece to be machined, and (2) is the workpiece (1) on which the workpiece (1) is placed. (3) processing tank,
(4) is the machining fluid that fills the machining tank (3), (5) is the machining fluid tank that stores the machining fluid (4), and (6) is the machining fluid (4).
) from the machining liquid tank (5) to the machining tank (3), (2) is the X-axis motor that drives the cross table (2) in the X-axis direction, and the older sister is the X-axis motor that drives the cross table (2) in the X-axis direction. Y# motor driven to, for example, the x-axis encoder that detects the rotational position 11 of the One machining electrode is attached to °zlIllll (9) facing (1), (to) is a 2-axis motor that drives 2 axes @, and 2 is a 2-axis that detects the rotational position * of the 2-axis motor (to) It is a ΔC device that controls the encoder, σQj, tXll[l motor (2), Y-axis motor (to), 2-axis motor (to), machining fluid tank (5), and machining status (1 ml).

Further, FIG. 5 is a blow diagram showing a control circuit of a conventional electrical discharge machining device, for example, where αG is a display section for displaying control details, αυ is an operation section consisting of a keyboard, etc., (2) is a tape reader that reads hc tapes, ■ is l
The CPU operates the external equipment according to commands from the 1llllSQn or the tape reader (2), outputs the control contents to the display QO, and executes the calculations necessary for processing. The X-axis motor (2) is driven by the command output, and ω is ai'uH.
Q is the X-axis encoder (B) and the X-axis encoder (
This is a current value counter that counts the output pulses of (to) and outputs them to (3PU (7)).

Next, the operation will be explained. When processing, for example, program content 1zc of No. tape from tape reader @
Load into PU■. When the X-axis servo amplifier Q)]) outputs the Y-axis servo ant drive signal according to the read program contents, the X-axis servo amplifier
RI-Small I Nof 1 This drives the λ-axis motor (2) and the Y-axis servo amplifier (to), and the cross table (2) on which the workpiece (1) is placed is placed on the X-axis.

N (3) moves freely in the YIM direction according to the commands of the tape. Also, the processing tr is applied to the workpiece (1) and
(The machining pressure is applied from J as shown in the figure, and the machining process is
Attach JI right Ge (1, 2 axes, 4) and 2 axes motor (to)
The machining progresses while servoing the machining electrode can against the workpiece (1). In addition, at this time, machining starts from the machining fluid tank (5)! (4) is supplied to the processing tank (3) by a pump (6). As if on top of the mountain
o Processing is executed according to the program contents of the tape.

[Problems that the invention solves or attempts to solve]

Conventional electrical discharge machining equipment is configured as described above (71
Every time the weight of the workpiece placed on the cross table changes, the amount of static deformation of the cross table, etc. changes, and the position of the workpiece relative to the machining table changes. There is one problem in that high-precision machining cannot be performed stably because an error occurs in the position commanded by the program. This invention solves the above problems. To obtain an electrical discharge machining device ρ that can stably perform high-precision machining by correcting the No. program by the amount of deformation of the cross table that is deformed by the weight of the chest. is 1 yen. [One-shot means to solve the problem] The electric discharge machining apparatus according to the present invention detects the electrical area of the workpiece loaded on the cross table from the weight detection means ζ. After that, input it to the FIIU device 8 [・The C device reads out the correction amount for correcting the deformation amount of the cross table corresponding to the detected value from the correction amount storage means and corrects the No. program. It's also true.

[Effect]

In the electric discharge machining apparatus according to the present invention, the iK amount detection means detects M* of the workpiece, and corresponding to the detected value, the correction m of the 1-cross table is read out from the correction amount storage means [, τ of the workpiece. The hC program is corrected by the diamond size of the cross table due to placement.

[Embodiments of the invention]

An embodiment of the present invention will be explained below. A blow diagram showing an electric discharge machining apparatus according to an embodiment of the present invention is opposite to the conventional example shown in FIG. Further, FIG. 1 is a flow diagram showing a control circuit of an electric discharge machining apparatus according to an embodiment of the present invention, and the same reference numerals as in FIG. 5 indicate the same parts, so a description thereof will be omitted.

In the figure, tsia) detects the current at the time of starting the X-axis motor (to), converts A/l), and (3)'tl-
Input to - r ro
Detects the current at the time of starting motor 33 and
Y-axis current detection means that converts and inputs to the Ul'U wheel, □
□□ is the workpiece (1) placed on the cross table (2).
) Preliminary storage of correction data for converting the amount of deformation of the cross table (2) due to the weight of the workpiece (1) from the amount of current at startup of the X-axis motor (to) and Y-axis motor Q for severe cases of This is the correction data memory.

Figure 8 shows the X-axis motor for severe damage to workpiece (1)
□Or, the amount of current at the time of starting the Y-axis motor (to) shows a pattern that increases in proportion to the weight of the workpiece (1), and therefore the amount of deformation of the cross table (2) can be calculated from the above amount of current. The operation will be explained next. Since the machining operation is the same as that of the conventional example, the explanation will be omitted, and the operation of correcting the amount of deformation of the cross table (2) will be explained.

The cross table (2) on which the workpiece (1) is placed is driven by the X-axis motor (support) or the X-axis motor field.
In this case, X@motor (to) or Y@motor (to)
As shown in the graph of Fig. 3, the workpiece 1 placed on the
It is known that a starting current flows in proportion to the weight of e3 (1), and that this starting current is also proportional to the amount of deformation of the cross table (2) caused by the weight of the workpiece (1). . Therefore, the amount of deformation of the cross table (2) due to the weight of the workpiece (1) is detected by the following procedure, and the NO program is corrected.

That is, after placing the workpiece (1) on the cross table (2), and before starting machining, run the I'llO program by the amount of deformation of the cross table (2) according to the order of the flowchart shown in Figure 2. to correct. The flowchart shown in FIG. 2 will be explained below.

First, for example, when a start signal is input from the operation unit αυ shown in FIG. ＠＋− Input to Boambu Cormorant, X
Axis motor (2) and Y-axis motor (to) are driven and cross table drive is started. Next, the X-axis motor □□
□ and the amount of current at the time of starting the X-axis motor (to) is detected and integrated for a certain period of time by the XSt current detection means t51aJ and the UYWI8 current detection means (52). At the time of completion, the X-axis motor ω and the Y-axis motor (to) are stopped, and the above measured current value is A/D converted.This A/D converted measured current value is stored in the correction data memory and γ Compare this with the current value and make the necessary corrections for the single cross table (2) corresponding to that current value.
Determine the value. Next, the ΔC program is read out and corrected using the above correction value.

After correcting the amount of deformation of the cross table (2) due to the weight of the workpiece (1) as described above, processing begins.

In the above embodiment, the electrical discharge machining device may be replaced by a wire electrical discharge machining device, and the same effects as in the above embodiment can be obtained.

In addition, in the above embodiment, if the amount of deformation of the cross table (2) is corrected in the l-Y plane (where the cross table (2) moves) (1,1 is corrected in two axes) [Effects of the Invention] As described above, according to the present invention, the cross table is deformed by the weight of the workpiece placed on it, the amount of deformation of the cross table is detected, and the NO program is executed. This has the effect of making it possible to execute a NO program that is related to the amount of deformation of the cross table and to obtain an electrical discharge machining apparatus with high machining accuracy.

[Brief explanation of the drawing]

FIG. 1 shows an electric discharge machining apparatus il according to an embodiment of the present invention.
2 is a control flowchart according to an embodiment of the present invention, and FIG. 3 is a diagram showing the relationship between the motor starting current and the cross table correction amount with respect to the weight of the workpiece according to an embodiment of the present invention. The fourth factor is a schematic diagram showing a conventional electrical discharge machining device*, and the fifth factor is a professional diagram showing a conventional electrical discharge machining device. This is a diagram. In the figure, (1) is the workpiece, (2) is the cross table, (7) is the hc device, +511 is the X-axis current detection means,
(52B) is Y@current detection means, and egg is a correction data memory. Note that the same reference numerals in the figures indicate the same parts.

Claims (2)

[Claims] (1) Weight detection means that detects the weight of the workpiece placed on the cross table, converts it into an electrical signal, and then outputs it;
A correction amount storage means for storing in advance a correction amount for correcting the amount of deformation of the cross table caused by the weight of the workpiece; and an output signal of the weight detection means is input, and the cross table corresponds to the input signal. An electric discharge machining apparatus comprising: an NC device that reads out the correction amount of the table from the correction amount storage means and corrects the NC program data according to the read out correction amount. (2) The electrical discharge machining apparatus according to claim 1, wherein the weight detecting means detects a current when a drive motor that drives the cross table is started.