JPS637892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric discharge machining apparatus, and particularly to an electric discharge machining apparatus in which a machining tank filled with a machining fluid is improved.

Conventionally, in this type of processing tank, since the table on which the workpiece is fixed needs to be level, the table and the outer wall of the tank are generally formed separately, and the two are used by fixing them together. was.

Such conventional processing tanks are shown in Fig. 1 and Fig. 2.
I found what is shown in the figure.

In the figure, the processing tank 10 includes a table 14 with a fixing part 12 protruding from the center and a dovetail groove for fixing the workpiece, and a box-shaped table 14 with a missing bottom corresponding to the fixing part 12 of the table 14. It is formed from the tank outer wall 16. A groove 20 for positioning the O-ring 18 is bored in the upper surface of the table 14 surrounding the fixing part 12, and a large number of screw holes 22 are provided in the upper surface of the table 14 corresponding to the outer side of the groove 20. Also, on the bottom of the tank outer wall 16, there is a table 1.
A hole 24 corresponding to the screw hole 22 of No. 4 is bored. To assemble this processing tank 10, after positioning the O-ring 18 in the groove 20 of the table 14,
Cover the tank outer wall 16 from above the table 1, and
A bolt 26 is inserted and fixed from the hole 24 of No. 6 to the screw hole 22 of the table 14. Further, numeral 28 in the figure is a machining fluid placed in the machining tank 10.

However, this conventionally used machining tank 10 has a groove 20 for positioning the O-ring 18.
Not only did processing require a large amount of machining man-hours, but in order to achieve watertightness due to the long O-ring 18, it was necessary to increase the number of bolts by 26.
This resulted in an increase in the number of parts and increased complexity in assembly. Furthermore, since a large number of bolts 26 are used to fix the tank outer wall 16 to the table 14, the straightness of the table 14 changes, making it necessary to adjust the straightness after assembly.

The present invention was made in view of the conventional problems mentioned above, and its purpose is to reduce the number of bolts for tightening to reduce the installation process, and to reduce changes in the straightness of the table after assembly. An object of the present invention is to provide an electrical discharge machining device having a tank.

In order to achieve the above object, the present invention provides an electric discharge machining apparatus in which a machining electrode and a workpiece face each other in a machining tank filled with a machining liquid, and the machining gap is energized to perform machining. The outer wall of the tank in the form of a box with a bottom is placed on the base, the table is positioned on the bottom of the outer wall of the tank, and the table and base are integrally fixed to the outer wall of the tank via a packing. Features.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

The present invention is shown in FIG.
is formed of a base 32, a tank outer wall 34 fixed on the base 32, and a table 38 positioned inside the tank outer wall 34 and fixed to the base 32 with bolts 36. The base 32 has, on its upper surface,
A screw hole 40 into which the bolt 36 is screwed is provided. In addition, the tank outer wall 34 has screw holes 4 of the base 32.
A washer hole 44 in which a washer 42 is placed is bored at the bottom plate position corresponding to 0. The table 38 has a dovetail groove on its upper surface for fixing a workpiece, and a bolt hole 46 for passing the bolt 36 at a position corresponding to the screw hole 40 of the base 32. Further, the washer 42 has a stepped portion 52 formed by a large diameter portion 48 and a small diameter portion 50, and a bolt hole 54 for passing the bolt 36 through the center thereof. Further, this washer 42 has a large diameter portion 48 located between the lower surface of the table 38 and the bottom surface of the tank outer wall 34, a small diameter portion 50 located within the washer hole 44 of the tank outer wall 34, and a small diameter portion 50 located between the table 38 outside the large diameter portion 48. A packing groove 56 is provided between the tank outer wall 34 and the lower surface of the small diameter portion 50.
O-rings 58 and 60 are arranged inside, respectively. In addition, 62 in the figure is a machining fluid put into the machining tank 30.

Next, the assembly of the processing tank 30 according to the present invention will be explained.

The outer wall 34 of the tank is placed on the upper surface of the base 32 so that the screw hole 40 and the washer hole 44 coincide with each other. After that, the washer 42 with the O-ring 60 inserted into the packing groove 56
is loosely fitted into the washer hole 44 of the tank outer wall 34, and an O-ring 58 is placed around the washer 42. Then,
Table 38 with bolt 36 passed through bolt hole 46
is placed on the bottom surface of the tank outer wall 34, and by turning the bolt 36, the table 38, the tank outer wall 34, and the base 32 are tightened together.

At this time, the table 38 and the tank outer wall 34 are connected to the washer 4.
The washer 42 and the base 32 are fixed in a watertight manner by an O-ring 60 on the lower surface of the washer 42. Therefore, even if the machining fluid 62 is placed in the machining tank 30, the machining fluid 62 will not leak to the outside.

In the present invention, the base 32 and the table 38 are separated, and the tank outer wall 34 is sandwiched between them.
There is no need to cut a groove for an O-ring on the table as in the past. Furthermore, since the total length of the O-ring is reduced, the number of tightening bolts (36) is also reduced.
Therefore, assembly can be facilitated.

As shown in the illustrated example, if the surface of the upper surface of the base 32 other than the portion to be tightened with the bolt 36 is formed into the recess 64, the contact area between the lower surface of the tank outer wall 34 and the upper surface of the base 32 will be reduced, and as a result, the table 38 The change in straightness during tightening is greatly reduced, eliminating the need for accuracy correction after assembly.

As described above, the present invention not only eliminates the need for special processing on members, but also simplifies the assembly process and significantly contributes to improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, FIG. 2 is a perspective view thereof, and FIG. 3 is a sectional view of a device according to the present invention. 30 is a processing tank, 32 is a base, 34 is a tank outer wall,
38 is a table, 58 and 60 are O-rings, 62 is a working fluid, and 64 is a recessed portion.

Claims (1)

[Scope of Claims] 1. In an electric discharge machining device in which a machining electrode and a workpiece are opposed to each other in a machining tank filled with machining fluid, and a current is applied to the machining gap between them to perform machining, the machining tank is placed on a base. Electrical discharge machining characterized in that a bottomed box-shaped tank outer wall is placed, a table is positioned on the bottom of the tank outer wall, and the table and base are integrally fixed to the tank outer wall via packing. Device. 2. An electric discharge machining apparatus according to claim 1, characterized in that a recess is formed on the upper surface of the base other than the part fixed to the table.