JPS6130334A - Machining condition controller for electric discharge machining device - Google Patents

Abstract

PURPOSE:To heighten the speed of machining and shorten the time thereof, by controlling an electric discharge machining machine on the basis of actually instructed machining conditions calculated from machining conditions before input, inputted machining conditions, a machined state and data from machining liquid state sensors. CONSTITUTION:When optional machining conditions are instructed by an instruction unit 2, a central processing unit 1 takes out optional machining conditions from a registration circuit 3 and sends out the conditions to another central processing unit 12, which calculates actually instructed machining conditions from the optional machining conditions, machining conditions before input, and data from sensors 4, 5, and sends out the actually instructed machining conditions to the power supply circuit 6, servo circuit 7 and liquid pressure control circuit 8 of an electric discharge machining device to regulate the circuits on the basis of the actually-instructed machining conditions to control the speed of a motor 9, the energy of discharge, a machining gap, the pressure of a machining liquid, etc. Since the data from the sensors 4, 5 change along with the progress in the electric discharge machining of a workpiece 11, the actually instructed machining conditions are altered to be always optimal to heighten the speed of the machining.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a machining condition control device for an electric discharge machine suitable for increasing the machining speed of electric discharge machining by changing machining conditions in stages.

[Background of the invention]

Conventionally, in the machining condition control of general-purpose electric discharge machines, machining gap voltage excluding surface roughness and electrode wear (machining energy), pulse rate of machining energy pulse (duty factor human hunting machining time and The machining fluid pressure was controlled, but when machining was completed within a short time, such as within several tens of minutes, it took time and effort to find the optimal machining conditions. However, in reality, it could not be applied to short-time processing.

However, recently, there has been a trend to increase the machining speed by changing the machining conditions at short intervals as the machining progresses, and also to include surface roughness and electrode wear into the machining conditions. Since exploration and setting of total machining conditions are required, there has been a demand for a control device that satisfies these points.

In addition to the control method described above, there is also a method of obtaining the final machined surface (by setting relatively detailed machining conditions and manually switching the machining conditions sequentially as the machining progresses), but in this case, the operation is In addition to being complicated, there was a problem in that the machining time was increased because a margin for machining (safety) was always required.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and allows searching and setting of total and accurate machining conditions to be carried out easily and quickly, and easily copes with short-term switching of machining conditions. [Summary of the Invention] Machining condition control for an electrical discharge machine according to the present invention, which can increase the machining speed and shorten the machining time. The machine inputs arbitrarily set machining conditions, and generates actual command machining conditions based on the input machining conditions, the machining conditions before inputting these machining conditions, and each data from the machining state sensor and machining fluid state sensor. The electric discharge machine is equipped with an arithmetic device that calculates the actual command machining conditions calculated by the arithmetic device, and automatically controls the electrical discharge machine.

[Embodiments of the invention]

The present invention will be described in detail below with reference to FIG. FIG. 1 is a block diagram showing an embodiment of a machining condition control device for an electric discharge machine according to the present invention, and 1 in the figure is a CPU for extracting machining conditions.
, 2 is an external switching command device that commands arbitrary switching of machining conditions from the outside. Reference numeral 3 denotes a processing condition registration circuit, which stores a processing condition table in which a plurality of processing conditions are written, which are selectively taken out by the CPU 1 based on commands from the command device 2.

4 is a machining state sensor that detects machining conditions due to the application of machining energy such as υ-discharge, short circuit, effective discharge, and sustained discharge according to the discharge pulse waveform; 5 is a machining state such as machining fluid flow rate between machining machining holes, fluid pressure, etc. This is a machining fluid condition sensor that detects.

6 to 10 each constitute an electric discharge machine, 6 is a power supply circuit for applying discharge energy between the electrode 10 and the workpiece 110, and 7 is a control circuit for controlling the discharge gap between the electrode 10 and the workpiece 11. a servo circuit 8 for controlling the flow rate of electrical discharge machining fluid between the electrode 10 and the workpiece 11;

A hydraulic pressure control circuit for controlling the hydraulic pressure, 9 is a processing feed control motor.

12 is an adaptive control CPU which, based on the machining conditions given from the CPU 1, controls the machining conditions, the machining conditions before the input of the machining conditions, that is, before the external switching command device 2 switches, and the machining state sensor. 4 and each data obtained by the machining fluid condition sensor 5, the arithmetic unit calculates the actual command machining conditions as the optimum machining conditions at that time. Output to. Even before the command device 2 switches to the next machining condition, the above calculation is repeated once or continuously at fixed time intervals if each data from the sensors 4 and 5 changes. That is, the actual command machining conditions are sequentially changed based on the data from the sensors 4 and 5.

Note that the CPUs 1 and 12 may be composed of one CPU.

Next, the operation of the above-mentioned device of the present invention will be explained.

First, when an arbitrary machining condition is commanded by the command device 2, the CPUI extracts the arbitrary machining condition from the registration circuit 3 and outputs it to the CPU 12 based on the command.

The CPU 12 executes the processing based on the machining conditions from the CPUI, the machining conditions before inputting the machining conditions (if there are no pre-machining conditions, only the machining conditions from the CPU 1), and each data from the sensors 4 and 5. The commanded machining conditions are calculated and output to the power supply circuit 6, servo circuit 7, and hydraulic pressure control circuit 8 of the electric discharge machine. Therefore, these electric discharge machine circuits 6 to 8 are C
It is controlled based on actual commanded machining conditions from the PU 12, and the speed of the motor 9, discharge energy, machining gap, hydraulic pressure of machining fluid, etc. are controlled accordingly. Furthermore, the data from the sensors 4 and 5 changes as the electrical discharge machining of the workpiece 11 progresses, but this also changes the actual machining conditions from the CPU 12 to maintain the optimum machining conditions.

Thereafter, when the command device 2 issues a command to switch the machining conditions at an appropriate time, the above-mentioned operation is repeated, and the electric discharge machining is always performed under the optimum machining conditions and completed.

〔Effect of the invention〕

As described above, in the present invention, arbitrarily set machining conditions are input, and the input machining conditions, the machining conditions before inputting the machining conditions, and the machining conditions from the machining state sensor and machining fluid state sensor are used. The EDM is equipped with a calculation device that calculates the actual command machining conditions based on the data, and the electric discharge machine is automatically controlled based on the actual command machining conditions calculated by this calculation device. Settings are easy and quick, so it can be applied when machining is completed in a short time, and it can easily handle short-term changes in machining conditions, increasing machining speed and shortening machining time. be able to. In addition, the number of sensors that provide data to the arithmetic unit can be easily increased, making it possible to explore and set the total machining conditions, resulting in further labor savings and automation. be. In addition, in the device of the present invention, the machining conditions may be commanded to be switched by operating the command device as electric discharge machining progresses. Since the machining conditions change, there is also the effect that operation can be greatly simplified compared to conventional devices in which detailed changes in machining conditions must be made manually.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a machining condition control device for an electrical discharge machine according to the present invention. DESCRIPTION OF SYMBOLS 1... CPU for retrieving machining conditions, 2... External switching command device, 3... Machining condition registration circuit, 4... Machining state sensor, 5... Machining fluid state sensor, 6... Power supply circuit,
7... Servo circuit, 8... Liquid pressure control circuit, 9...
Processing feed control motor, 10... Electrode, 11... Workpiece, 12... PU0 for adaptive control

Claims (1)

[Claims] The arbitrarily set machining conditions are input, and the actual command machining conditions are calculated based on the input machining conditions, the machining conditions before inputting the machining conditions, and each data from the machining status sensor and machining fluid status sensor. What is claimed is: 1. A machining condition control device for an electrical discharge machine, comprising: a computing device for automatically controlling the electrical discharge machine based on the actual command machining conditions computed by the computing device.