JPS63288619A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To enable a machine to perform stable and efficient machining, by storing in memory the limit value of an electrode return amount, suited in every electric machining condition, to be left as previously programmed and setting the limit value to the optimum matching with the electric machining condition or the like during the machining. CONSTITUTION:A machine respectively stores the updated electrode position in the time of jump end in a memory 1 and the electrode deepest position in the time of end of jump motion, performed in the past, in a maximum depth value memory 2. And the machine calculates in an adder 4 an electrode return amount in the time of end of lately performed jump motion to be stored in a memory 3. While the machine respectively stores the limit value of an electrode return amount in each machining condition in a limit value memory 6, electric condition during machining in a memory 7 and the limit value of the optimum electrode return amount in a condition during machining in a memory 8. And the jump condition is changed when the value of the memory 3 exceeds the value of the memory 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to 17 solder processing and filtering, and relates to a processing control device for the same.

[Conventional technology]

Conventionally, machining powder such as metal machining powder and decomposition products of machining fluid generated between machining machining spaces during electric discharge machining is usually removed from the machining machining state by explosive pressure generated by machining, forced circulation of machining fluid, and jumping movement of the electrode. We are trying to recover Hatata. Among these, the jumping motion of the electrode has a great effect of providing a 6ζ pump action between the electrodes and eliminating 9 milling powder, but this condition is usually fixed at regular intervals, and the period and jump breath are determined by the user depending on the machining area and It was set according to the depth, etc.

In order to make the system even better, the invention of + was proposed in Japanese Patent Application No. 180880/1983, and the contents thereof will be explained below.

Conventional jump conditions were only set by the user, so the setting position was affected by the workpiece, machining depth, machining conditions, etc., and depending on the setting method, machining speed may differ or arc Therefore, it was very difficult to find the exact setting value. Therefore, a method of using contamination detection to detect processed powder has been proposed, for example, in Japanese Patent Application No. 61-1801180. In addition, this amount of contact means that the electrode has retreated from its deepest position by the servo! 1 is shown.

To explain the proposed patent application No. 180880/1988 using diagrams, in Figure @5,
(1) is the first memory lJ, (2) is the second memory that records 1# deep electric potential, (3) is the memory of Uki 8, (4) is the addition 1
1, (5) is a comparator, and <6) is a memory of 2g4.

At the start of machining, the first memo 'J (1), the second memory (2), and the eighth memory (3) are cleared by r%+ζ.

When the machining starts and the first Danto jump movement is performed according to the user settings, the descending electrode potential IΔ1 at the end of the jump movement is stored in the first memory (υ〉) and the second memory (2).
). In the second and subsequent electrode jump movements, the electrode position Δh at the end of the deepest jump is always @l
At the same time, the comparator (5) compares the position of the carp Δh with the deepest electrode position Δ at the end of the jump movement performed in the past. As a result of this comparison, when Δh becomes Δ, 1ζ assumes that the electrode position Δh is the deepest snow amount, and this n is recorded in the second memory (2). Otherwise, add up! By (4), KW△
Difference between h and deepest position Δ △h - Δ = Eh is calculated n%
The result of the calculation is recorded in the memory (3) of 8g8. That is, the amount of contamination 17 at the end of the most recent jumping exercise is always recorded in the eighth memory (3).

On the other hand, the limit [1'll%] of the amount of contamination V1, that is, the limit contamination amount A, which is a condition for performing jump condition change C, is input to the fourth memory (6). t
In addition, data from the eighth memory (3) and the fourth memory (6) are input to the comparator (5), and the two inputs are compared. If either the former or the latter is exceeded, the jump condition is changed.

The movement for one jump movement described as 70-chart 1 in FIG. 6 is also shown.

[The 110M point that the invention is about to reach] In conventional electrical discharge machining equipment, the limit iI of the amount of electrical Ti return is set constant, even though the electrical discharge gear drop varies depending on the electrical conditions. There was a problem that the robot would jump or not jump even though it was unstable.

This invention was made in order to solve the above-mentioned problems, and it is possible to accurately and quickly determine whether the machined part is good or bad, and when a deterioration of the machined state is detected, it is possible to change the various conditions for machining. The object of the present invention is to obtain an electric discharge machining device which can stabilize a machined part by doing so.

[Means for solving problems]

The free machining device according to the present invention detects the deterioration of the machining state ω by the amount by which the electrode has retreated from the deepest position by the servo, and when the electrode return amount exceeds the limit value under the conditions during machining. In this version, the jump conditions are changed.

[For production]

The electric discharge machining apparatus of the present invention has the ability to program in advance the limit of the electrode return amount suitable for each electrical machining condition, and to set the limit to the optimum value according to the electrical conditions during machining. Stable and efficient processing becomes possible.

[Embodiments of the invention]

Hereinafter, one embodiment of this invention will be explained. 1st
In the figure, (1) is the first storage means (hereinafter referred to as the first memory), (2) is the second storage means for recording the deepest position (hereinafter referred to as the second memory), and (3) is the first storage means (hereinafter referred to as the second memory). tJIJ
8 storage means (hereinafter referred to as the 8th memory), (4) an adder, (5) a comparator, and (6) a storage means for the limit value of the electrode return amount under each machining condition (hereinafter referred to as the 4th memory). ), (7) is the fifth storage means (hereinafter referred to as the fifth
(8) indicates a sixth storage means (hereinafter referred to as the sixth memory).

At the beginning of processing, the first memo! J(1), @2 memory (2), and eighth memory (3) are cleared to zero.

When machining is started and the first polar jump movement is performed according to the user settings, the descending electrode position 6ri at the end of the jump movement is stored in the first memory (1) and the second memory (2). recorded in @N after the 2nd concave day, in polar jump movements, the electrode position at the end of the deepest jump is always △h
is recorded in the first memory (1), and at the same time, the comparator (5) compares the electrode position Δh with the deepest electrode position Δ at the end of the jump interlock performed in the past. If Δh becomes Δ due to this comparison, then the electrode position Δh(? is considered to be the deepest position, and this is the memory (2) of @2).
recorded in In other cases, by adding a(4), the difference Δh - Δ between the electrode Δh and the deepest position @1 k = eh
is calculated, and the calculation result is recorded in the eighth memory (3). That is, the eighth memory (3) always contains fnI)! At the end of the recent jumping exercise! The return of the pole will be recorded. On the other hand, in the fourth memory (6), the eye limit value H of the wt@return amount under the diameter machining condition t is manually entered. In the memory (8) of ffA6, the limit value of the optimal electrode return end under the conditions during processing is selected from the fourth memory (6) and recorded.In other words, the conditions for changing the jump condition The @aiFM return amount is input.Also, compa v -II (5) JCIt,!
The data from ik is input, the forces of both people are compared, and if the former exceeds the latter ik, the V jump conditions are changed.

The operation for one jump movement described above is also shown in the flowchart of FIG. The case where the former exceeds the latter is the case at point A in FIG. 3, and it is considered that a large amount of processing powder has accumulated between the electrodes. It is clear that if this state is left as it is, the processing speed will drop rapidly, as shown in FIG. However, point A shown in Fig. 4 is the same point shown in Fig. 8.
Changing the jump conditions described above means changing the jump conditions set by the user to jump conditions that further improve the processing powder discharge effect. For example, the jump interval is changed to 14
For example, shorten the jump to 4 times, and perform four jumps with the jump distance set to double.

The limit 1Ilc pole return amount shown in the example, the processing powder discrimination method, the number of memories to be used, the jump conditions at the time of change, the configuration of the logic circuit, and the pond are widely known within the scope of this invention. Use these to make various changes! It is possible to carry out this invention, and it encompasses all aspects of this invention.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to set the limit of the electrode return according to the electrical conditions, so that the processing powder m between the electrodes can always be placed optimally under all conditions.
As a result, the processing method [F] is stabilized and released [time 1! This has advantages such as being able to shorten I and allowing the user to efficiently set jump conditions.

[Brief explanation of drawings]

@Figure 1 is a block diagram of a 7FLR electrical machining device showing a simple embodiment of the present invention, and Figure 2 is a flowchart showing the operation of the above dice m example for one jump motion. Figures 81m and 14 are graphs for explaining the operating principle and t-pole jump motion of the above embodiment. In the figure, symbols (1) to (3) are memories, and (4) is addition!
, (5) are comparators, and (tl) to (8) are memories. The same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In the electric discharge machining apparatus, the first storage means records the electrode lowered position during the most recent jump operation, the second storage means records the deepest position the electrode has lowered up to the most recent jump operation, and the an adder that calculates the difference between the electrode lowering position and the deepest position; a third storage means that selects and records the limit value of the electrode return amount that is optimal for the conditions during machining; Compare the memory contents of the memory means of
Equipped with a comparator that outputs a signal when the former exceeds the latter,
An electric discharge machining apparatus characterized in that an electrode jump condition is changed according to an output signal of the comparator.