JPS60177825A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To improve the working accuracy by providing a scanner and temperature indicator for taking informations from temperature sensors in various sections of machine thereby eliminating the relative positional shifting between the electrode and a work due to thermal deformation of mechanical structure. CONSTITUTION:Temperature sensors 16 and scanners 17 provided at various sections in an electric discharge machine 15 will measure the temperature at each section of machine periodically and automatically. Here, the scanning command is provided from NC controller 18. The measured temperature is A/D converted through the scanner 17 and fed to NC controller 18 where the measurement can be confirmed by the operator through NC controller display. Upon exceeding of the temperature distribution on respective section of machine over preset allowable range, NC controller 18 will provide an alarm display to the operator. At the same time, a cooling blower 19 is started to uniform the temperature at each section of machine automatically.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to an electric discharge machining apparatus used for precision machining.

[Prior Art] FIG. 1 is a side view showing an example of a conventional electrical discharge machining apparatus. (1) is the machining fluid of the electrical discharge machine, (2) is the machining fluid (1
) is stored in the machining tank where electrical discharge machining is performed inside the machining fluid (1), (3) is the electrode, (4) is the spindle (2 axes) that feeds the electrode (3), and (5) is the workpiece. It is. (6) is a table for attaching the processing tank (2) and workpiece (5);
It can move in the direction of arrow X. Also (7)
Move the table (6) in the direction of arrow Y using the lotus dollar.

(8) is a head that guides and attaches the main shaft (4);
) is the column, (9a) is the inner surface of the column, and (9b) is the outer surface of the column. aO) is a bed to which the column (9) is attached and supports it, and (12) is a cooling fan provided at the top of the column (9).

According to the conventional electrical discharge machining apparatus configured as described above, the electrode (3) is placed in the machining fluid [1] stored in the machining tank (2).
A power source (not shown) supplies electrical discharge energy between the workpiece (5) and the workpiece (5) to generate electrical discharge, thereby performing electrical discharge machining of the workpiece (5). At this time, the temperature of the liquid U liquid (1) rises due to the discharge energy, and the liquid temperature of the liquid U liquid (1) increases.
) and the table (6) are heated by this liquid temperature. Therefore, the temperature of the machining fluid (1), the machining tank (2), and the table (6) increases as well as the temperature around the electrical discharge machining apparatus main body. This temperature rise gradually increases depending on the amount of machining energy from the start of machining, and becomes a large heat source in the main body of the discharge power machining apparatus. The upper surface of the machining fluid (1) whose temperature has increased,
Radiant heat shown by the arrow αυ is generated from the processing tank (2) and the table (6), and the radiant heat (Iυ) heats the inner surface of the column (9a) facing the heat source, increasing the surface temperature. The temperature distribution in each part of the electrical discharge machining apparatus also changes due to changes in the atmosphere such as the room temperature or heat generated from the ground motion motor.

By the way, when the surface temperature of the mechanical structure facing the heat generation source rises compared to other surface temperatures, the 111i surface (9a) in the column, the main shaft (4), etc. become heated, as shown by the two-dot chain line in Fig. 1. There was a problem in that the deformation occurred, and the position of the pole (3) was shifted by an amount indicated by ε compared to the initial position of the workpiece (5), resulting in deterioration of the machining accuracy of the workpiece (5). Such deterioration in processing accuracy also occurs due to changes in room temperature, heat generation of the drive motor, etc.

For this reason, conventional electrical discharge machining equipment uses a cooling fan (12+
was installed at the top of column (9) or at the rear of bed 0 (1) and cooled by blowing in outside air, but if ventilation was insufficient, there was a risk that machining accuracy would deteriorate as well. .

Figure 2 is a perspective view showing the machining fluid temperature distribution and actual measured values of relative displacement when the room temperature changes (18°C) in a conventional electrical discharge machining device, and Figure 6 shows the relationship between the electrode (3) and the temperature due to room temperature changes. FIG. 3 is a diagram showing temporal changes in relative displacement occurring between workpieces (5).

[Summary of the invention]

The present invention was made to solve the above-mentioned problems, and it reduces machining errors caused by relative positional deviation between electrodes and workpieces due to thermal deformation of the mechanical structure, and performs highly accurate machining. In order to obtain an electric discharge machining apparatus, there is provided an electric discharge machining apparatus in which a temperature sensor is provided in each part of the electric discharge machining apparatus, and a scanner and a temperature display device are further provided to take in information from the temperature sensor.

[Embodiments of the invention]

FIG. 4 is a side view showing an embodiment of the present invention.

Note that parts having the same functions as those in FIG. 1 are given the same symbols, and explanations thereof will be omitted. In the figure, (I9 is the electrical discharge machining equipment main body, (
15) is a temperature sensor provided in each part of the electrical discharge machining apparatus main body α9, an is a scanner (AD converter), a second is an NC control device, and a fence is a floor for cooling the processing machine.

The electrical discharge machining apparatus main body (temperature sensor + installed in each part of 19) and the scanner (lη periodically and automatically measure the temperature of each part of the electrical discharge machining apparatus. At this time, the scanning command is sent to the NC control device ( It is emitted every second.

The measured temperature value is A-D converted by a scanner (171) and sent to the NC controller α, so that the operator can confirm the measured value through the NC controller display.

The operation of the present invention configured as described above will be explained as follows. Now, if the temperature distribution of each part of the electrical discharge machining machine exceeds the preset tolerance range, the NC control device (18
1 displays an alarm to warn the operator. At the same time, a cooling system such as a blower 0 for cooling the electric discharge machining apparatus is activated, and the temperature of each part of the electric discharge machining apparatus is automatically made uniform. The temperature distribution tolerance range and temperature measurement interval are N
An operator can set an arbitrary value through the C control device 81, and can freely activate the temperature management function within 1 second using the NC control device.

In the above explanation, the temperature sensor (1e1 scanner〇η
Although the case is shown in which instructions to the cooling proar 119, warnings to the operator, displays, etc. are all performed through the NC control device 08, the present invention is not limited to this, and these operations can be performed by the NC control device. may be performed using a separate controller. Further, in the above description, the cooling system is one system, but it may be divided into multiple systems to focus cooling on areas with particularly large temperature irregularities.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to eliminate the relative positional deviation between the electrode and the workpiece that occurs due to thermal deformation of the electrical discharge machining equipment due to environmental changes such as room temperature, motor heat generation, machining heat, etc. It is possible to achieve remarkable effects such as being able to perform electric discharge machining with extremely high precision.

[Brief explanation of drawings]

Figure 1 is a side view showing an example of a conventional electrical discharge machining device, Figure 2
The figure is a perspective view showing actual measured values of machining fluid temperature distribution and relative displacement in a conventional electric discharge machining device, Fig. 6 is a diagram showing temporal changes in relative displacement, and Fig. 4 shows an embodiment of the present invention. FIG. 1... Processing tank, 2... Processing liquid, 6... Electrode, 5...
...Workpiece, 8. ,, head, 9...column, 10...
... Bed, 15... Electric discharge machining equipment body, 16...
Temperature sensor, 17... Scanner (A-D converter)
, 18...NC control device, 19...cooling blower Note that the same reference numerals in each figure indicate the same or relative parts. Agent Patent Attorney Sanro Kimura Figure 3 Haruma 10 1r Procedural amendment (spontaneous) May 9, 1985 Commissioner of the Japan Patent Office 1 Indication of case Patent application No. 1982-29593 2 Name of invention Electric discharge machining Apparatus 3, Representative Hitoshi Katayama of the person making the amendment Section 4, Agent 5 Deaf, Target of amendment 6, Contents of amendment (1) Scope of Claims 1 of the Specification will be amended as shown in the attached sheet. (2) "1-processing tank, 2...processing liquid" on page 7, line 20 of the specification is corrected to "1...processing liquid, 2...processing tank". The above appended claims (amended) ``(1) In an electric discharge machining device that performs machining by generating electric discharge between opposing electrodes and a workpiece, temperature sensors are provided in each part of the electric discharge machining device, and An electrical discharge machining device characterized by being equipped with a scanner and a temperature display device that take in information from a temperature sensor. An electric discharge machining apparatus according to claim 1, characterized in that the electric discharge machining apparatus comprises Riko Eitan. (3) The electric discharge machining apparatus according to claim (2), wherein information from the temperature sensor is stored in a memory of the NC control device. (4) When the information from the temperature sensor exceeds a certain allowable range, the NC control device gives a warning to the operator. The electrical discharge machining device described. (5) The NC control device has a function of activating a cooling system to equalize the air temperature when the information from the temperature sensor exceeds a certain allowable range. 2) The electric discharge machining device described in Section 5L Uni-Dish. (6) Claims (4) or (5) characterized by having a function to arbitrarily set the permissible range.
Xiangri presentation electrical discharge machining equipment. ”

Claims (6)

[Claims] (1) In an electrical discharge machining device that performs machining by generating electrical discharge between opposing electrodes and a workpiece, each part of the electrical discharge machining device is provided with a temperature sensor, and information is taken in from the temperature sensor. An electrical discharge machining device characterized by being equipped with a scanner for performing the process and a temperature display device. (2) The electrical discharge machining apparatus according to claim (1), characterized in that information from a temperature sensor is displayed on an NC control device display. (3) The electrical discharge machining apparatus according to claim 21, characterized in that information from the temperature sensor is stored in the memory of the NC control device. (4) Electrical discharge machining according to claim (2), characterized in that the NC control device gives a warning to the operator when the information from the temperature sensor exceeds a certain allowable range. Device. (5) The NC control device has a function of activating a cooling system to equalize the temperature of the processing machine when the information from the temperature sensor exceeds a certain allowable range. 2) The electric discharge machining apparatus described in section 2). (6) A special feature that allows you to set the tolerance range arbitrarily! The electric discharge machining apparatus according to item (4) or item (5) of the desired range of T:M.