JPS60135123A - Electric discharge machining device - Google Patents

Abstract

PURPOSE:To aim at equalization in temperature of the whole device and improvements in machining accuracy as well as to prevent thermal deformation such as a colume tilt and the like from occurring, by coupling a cooling device, a machining fluid tank and a machine body with a heat pipe from the thermal standpoint, in case of an electric discharge machining device. CONSTITUTION:A machining cluid 8 in a work tank 4 and a machining fluid tank 6 each in case of an electric discharge machining device is made to circulatorily flow round with a filtered feed pump 5. And, in order to make temperature so as to be constant, a cooling device 15 and the machining fluid tank 6 are coupled together from the thermal standpoint via a heat pipe 17 whose end part is impregnatedly installed inside the machining fluid 8 of the tank 6 via a regenerator 16. In addition, the cooling device 15 and the work tank 4 are coupled together by another heat pipe 19 whose end part is impregnatedly installed in the machining fluid 8 of the work tank 4 via a regenerator 18. And, a machine body 12 and the cooling device 15 are also coupled together from the thermal standpoint through one more another heat pipe 20. With this constitution, temperature in the electric discharge machining device as a whole becomes equalized so that uniformization to the setting temperature of the cooling device 15 comes to fruition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an electrical discharge machining equipment for controlling the strength of machining fluid.

(g'Next technology) First, the Haramachi 3
To clarify with the figure, the workpiece 2 is placed at the bottom of the processing tank in which the Pit power III liquid 8 is stored, and the processing tank 4
The machining fluid tank 6 is communicated with the machining fluid tank 6, and the machining fluid 8 inside the machining fluid tank 6 and the machining tank 4 is freely circulated by the filter-equipped supply pump 5 trap, and the machining fluid 8 in the machining tank 4 is used for machining by electrical discharge machining. The powder is removed and circulated, and the electrode 1 is placed facing the workpiece, and the DC servo motor 7 is used to constantly maintain an appropriate gap between the electrodes and the workpiece. Electrode 1 is supported by machine body 12 so as to perform servo feeding of pole 1, and furthermore, between the electrode and the workpiece, a DC power source 10 of Carini Yugen Otsu is installed.
The machining current is intermittently supplied between the opposing poles of the electrode and the workpiece by interposing a switching element 9 for on/off of the machining current, a current limiting resistor 11, and an oscillator 1 for controlling the on/off of the elements. I can do it 5 V t, c.

Now, the machining current is ■, the voltage value of the DC power supply 10 is E, the resistance candy of the current limiting resistor 11 is I (and the electrode 1 and the workpiece 2
If the voltage value between the electrodes is V, it represents the amount of heat consumed by E11, and V and I represent the amount of heat generated between the electrodes. The inter-electrode voltage (2) is about 25 V during arc discharge, but the amount of heat generated at the electrode mouth (11) is proportional to the machining current (2), and is large in the rough machining region where the machining current is large, for example, the average When the machining current is 60A, it becomes 1500 Vi, so the amount of heat generated between the machining electrodes increases the temperature of the machining fluid 8 in the machining tank 4, and kerosene-based kerosene is used as the machining fluid. In some cases, there is a risk of a fire occurring due to its low flash point, and the generated heat is conducted from the machining fluid 8, machining tank 4, etc. to the machine storage body 12, resulting in uneven heat distribution and thermal expansion. It has been pointed out that this causes thermal deformation such as tilting of the column of the machine body, making it impossible to perform high-precision and high-speed machining. In order to eliminate the above-mentioned problem ffi point, by keeping the temperature of the machining fluid 8 at a constant temperature, the machining fluid 8,
An electric discharge machining apparatus f'=?, which is composed of a 1M1 tank 4, a machining fluid tank 6, a column (not shown), a bed, a radish, a table, etc. It is obvious that it is necessary to prevent thermal deviation in the entire flexible machine body 12, and for this purpose, the electric discharge machining apparatus shown in FIG. 2 has been conventionally considered. A cooling device 14 is interposed in the piping system of the supply pump 5 with a filter for circulating the machining fluid 80 times between the machining fluid tank 6 and the machining fluid tank 6, and in this way the temperature of the machining fluid is kept constant. It is equipped with a ridge structure that controls the speed.

However, the cooling device 1 for constant control of the machining fluid level described above
In the conventional electric discharge and machining equipment having 4, the machining fluid 8 is circulated to keep the fluid temperature at 1-, so if the amount of circulation is not large enough compared to the total amount of machining fluid. In this case, there is no effect of liquid drying equalization, and the uniformity of the liquid temperature is insufficient, so the installation location of the extra temperature detector in the cooling device will affect the overall processing liquid. The average value of the temperature will be different, and since the machining fluid 8 containing machining powder passes through the cooling device, it is necessary to have a special structure for the cooling device. It is unavoidable that the supply pressure will drop and circulation will become insufficient.

(Summary of the Invention) This invention has been made from such an existing tank, and includes a processing tank and a processed liquor tank whose feed joints are circulated by a supply pump with a filter. By thermally connecting each of these and a cooling device that controls the temperature to a constant level using a heat pipe,
, *: * The purpose is to provide an electrical discharge machining device that eliminates the runner-up features of a die machining device.

(Embodiments of the invention) Next, embodiments of the invention will be described with reference to drawings.
In FIG. 6, the machining fpi 8 of the machining bath 4 and the machining fluid tank 6 are circulated by a filter-equipped supply pump 5, and a cooling device 15 and the machining fluid tank which can be freely controlled to maintain a constant temperature are shown. A part of the shell is immersed in the machining liquid 8 of the kunk via a heat exchanger 16, and is connected to the k, ° ( ) by a heat pipe 17, and the cooling device and the machining tank 4 are connected to each other by a heat pipe 17. Add M- to the processing liquid 8 in the tank.
The machine body 12 and the cooling device are uniformly thermally coupled by another heat pipe 19 whose end is immersed via an exchanger 18, and the machine body 12 and the cooling device are further connected to each other by another heat pipe 2.
At O, Ikun is combined with Mi.

Therefore, according to 9 examples, this fruit is a beet pipe 17
．． 19.2 [The aim is to be non-powered, have a simple structure, and have an extremely large heat transfer property, which allows heat to be transmitted efficiently even with a temperature difference of only /J%, so that the heat consumed between the poles can be reduced. Even if the temperature of the machining fluid or the machine body is thermally non-uniform, the temperature of the hot water in the entire electrical discharge machining device is made uniform, and the temperature can be kept constant at the set temperature of the cooling device 15, which is different from the conventional device. Deformations such as column tilting are eliminated, and the machining results can be achieved with high precision and high speed.Also, since the cooling device is not structured to allow machining fluid to pass through the inside, a special structure is not required. In addition, there is no problem with the conventional device, which is a decrease in the supply pressure of machining fluid.

Although the above-mentioned embodiment has been explained by using a hybrid electric discharge machining apparatus as an example, it goes without saying that the same effect can be achieved by applying the present invention to other wire cutter 7i/lit machining apparatuses.

(Effects of the Invention) As described above, the present invention eliminates all the drawbacks of the conventional device by thermally coupling the cooling device, the machining liquid tank, etc., and the machine body using a beat pipe. The utility value of the above is extremely large.

[Brief explanation of the drawing]

Figure 1 is a theory showing the principle of electrical discharge machining equipment, and Figure 2 is a conventional machining liquid lake constant p! An explanatory diagram of an electric discharge machining apparatus equipped with a cypress, and FIG. 1...electrode, 2...workpiece, filter...for processing, source, 4...processing grade, 5...with filter, supply pump,
6... Processing fluid tank, 7... DC 4 servo motor,
8... Processing liquid, 12... Machine body, 14... Cooling device, 15... Cooling device, 16.18... Heat exchanger,
17,19.20...Heat pump. In the figures, the same reference numerals indicate the same or corresponding parts. Agent Patent Attorney Sanro Kimura

Claims (1)

[Claims] Electric discharge is applied by placing Iffff machining liquid under the edge between the 1ft pole and the workpiece. Electrical discharge machining equipment (electrical discharge machining equipment) is a machine that thermally combines the water temperature with a cooling device that controls the water temperature at a constant level using a heat vibrator (heat vibrator).