JPS58206310A - Electric machining device - Google Patents

Abstract

PURPOSE:To make a stationary board section lightweight and also to prevent thermal deformation by constituting the stationary board section with a ceramic material divided into multiple segments so that grooves with a reverse T-shaped cross section are formed at their boundaries. CONSTITUTION:The stationary board section 30 of a table of a discharge machining device is constituted by arranging segments 30a molded with a ceramic material in a row and fixing them with bolts 42. The side surface of the segment 30a is formed in a stepped shape 36 and a boundary is made a groove 40 with a reverse T-shaped cross section. A T-nut is embodied in this groove 40 to fix a work 14. The semgent 30a is made a rib-type structure having a cavity 34 and is made lightweight, and its machanical strength is also ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric machining device, and particularly to an electric machining device that performs machining by applying a pulsed machining current while supplying machining fluid between a tool and a workpiece.

Generally, in this electric machining apparatus, a workpiece fixed to a table is machined while the machining fluid is being supplied under pressure while the machining fluid remains therein.

Therefore, the table on which the workpiece is fixed is directly exposed to the machining fluid. However, the temperature of the machining fluid rises as the workpiece is machined, generally reaching a temperature 10 to 15 degrees C higher than the ambient temperature, which is the largest dimensional difference due to thermal deformation of the table. It is the cause. Conventionally, this table has a base made of cast iron and a surface plate formed by cutting out natural stone, that is, gabbro, fixed to it. Although the surface plate made of this spotted stone has the advantage of having a smaller coefficient of thermal expansion and less deformation than other materials such as cast iron, it has very poor workability because it is made of natural stone, and it cannot be formed particularly thinly. It was difficult.

For this reason, the surface plate must have a heavy lid, which increases the load on the guide section that guides the table for positioning, reducing the accuracy of positioning, and this causes the workpiece to be machined. This resulted in a decrease in the JX glaze level of the product. Furthermore, since the deple portion already occupies a considerable amount of weight, there is a problem in that the number of workpieces that can be placed on the table is limited. Furthermore, the thick natural stone surface plate has the problem of large accumulation of distortion due to thermal deformation. In order to reduce this distortion, it is possible to form the surface plate portion by dividing it, however, dividing the natural stone in such a manner is very expensive due to poor workability.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to provide a structure that is easy to manufacture, and to significantly reduce the weight of the table while maintaining sufficient mechanical strength. This makes it possible to reduce the charge load on the guide part of the table by 1, making it possible to accurately determine the position of the brass, and also to minimize φ due to thermal deformation, making it relatively heavy. To provide an electrical machining device that can process even a different workpiece with a high degree of accuracy.

In order to achieve the above object, the present invention provides a pulsed machining dragon θt1.
In an electric processing device that performs machining all the way, the surface plate portion for fixing the workpiece is made of a ceramic material, and the surface plate portion is divided into several parts in the l direction and arranged. In addition, a groove having an inverted T-shaped cross section is formed at the boundary between each divided body.

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

The figure shows an embodiment of an electrical processing apparatus according to the present invention.

The device shown in the figure includes a spindle head 10 that servo-feeds the electrode 12, a gap detection device 16 that detects the gap voltage between the electrode 12 and the workpiece 14, and a gap detection device [16] that A drive amplifier 18, which applies direct pressure to the motor 20 that drives the spindle head 10 up and down,
A power source 22 and the like is used to supply an intermittent pulp-like machining current between the pole 12 and the workpiece 14. Further, in order to securely fix the workpiece 14 to the W shadow portion 30 of the table 32, a push metal fitting 24, a leveling bolt 26, a bolt 28, etc. are used.

The upper BL2 storm pole 12 corresponds to the tool.

In addition, bolts 4 are mounted on the surface plate portion 30F1 table base 32a.
2 and bushings 44.

The electrode 12 and the workpiece 14 are connected to the power source 22 via cables 46 and 48. The table 32 is provided in a machining tank 50 in which machining fluid is retained. Although not shown, the table 32 is moved and positioned while being guided by a guide section.

Here, the surface plate 30 is made by mixing and kneading alumina crystals, molding or pressure forming using a mold, and then firing at 17 degrees Celsius temperature.

It is made of twisted ceramic material. Since its shape is formed by molding or pressure molding using a mold, it is easy to form the empty npJ 34 into a lip-shaped structure facing south, as shown in the figure. Also, its thickness is much thinner than the conventional surface plate made of natural stone, but the lip-shaped structure ensures sufficient mechanical strength. This surface plate part 30 is not a single body but is constituted by a set of divided bodies 30a divided into a plurality of pieces in the plane direction, and each divided body 30a has li4! A groove 40 having an inverted T-shaped cross section is formed at the boundary portion where D meets by forming the side surface portion into a b+J shape 36. By incorporating the 'r nut 38 into this #440, a workpiece 14 of any size can be
can be easily fixed in any position. The size of the cavity 34 is determined according to the safety strength of the surface plate 30, but by subdividing the cavity 34 with a large number of ribs, the table 32 can be made light in violet and its strength (secondary moment of area) can be reduced. It is possible to further increase the amount at the same time.

The lip-type structure surrounding the wall side 34 is made of 6C per each divided body 30a.

Now, in the electric processing device having the table 32 as described above, the surface plate part 30 of the table 32 is made of ceramic material, so its shape is made thinner and has a divided structure, and each divided body 30a is A lip-type structure having a cavity 34 at the top is advantageously implemented, and this makes it possible to achieve both the two conditions of making the lid significantly lighter and ensuring a certain level of mechanical strength. As a result, first of all, the load on the guide section that guides the movement of the table 32 is reduced, making it possible to maintain the positioning accuracy of the table 32, thereby controlling and maintaining the machining accuracy. become able to. In addition, by making the table 32 lighter and later securing its stock strength, the table 32
It also becomes possible to relax military and police restrictions on the workpiece 14 that can be placed on the machine. Furthermore, the surface plate part 30# is made thinner due to its lip-type structure, and is divided into multiple parts, so that the accumulation of distortion due to thermal deformation is completely eliminated9, and in this respect, processing accuracy is also can be significantly improved. Furthermore, #140 having an inverted T-shaped cross section formed between each divided body 30a can be used very conveniently to identify a workpiece at an arbitrary position.

As described above, the blood processing device according to the present invention is easy to manufacture, the table part is formed to be placed on it, has sufficient pattern strength, and has almost no distortion due to thermal change. Because of this, it is possible to process workpieces that are stacked one on top of the other to a higher degree of glaze than before.

[Brief explanation of the drawing]

The figure is a cross-sectional view showing an embodiment of an electrical processing apparatus according to the present invention. In the figure, the same members are given the same reference numerals, and the electrode as a 12#i tool, 14 is the workpiece, 22 is the 'kL axis, 3° is the surface plate, 30a is the 11-divided body, 32 is the table, and 32a. 34 is a base, 40 is a monument having an inverted T-shaped cross section, 50 is a processing tank, and 52 is a processing fluid. Agent: Patent attorney Shin Kuzuno (Bi or 1 person) Line 4: Director of the Agency τj′1, Displaying 41 patent applications 57-88303
02, Name of Simaki Electric power [Device 3, Sleeve j1:, Doing h Relationship with case Patent applicant Representative 111 Jin Hachibe 4, Agent Address Marunouchi-duplex, 111-ku Chiyo, Tokyo [ 1
-1 drawing of -tS+ explanation of invention of light I11.

Claims (1)

[Claims] (1) In an electric machining device that performs machining by applying a pulsed machining current while supplying machining fluid between a tool and a workpiece, the surface plate portion that fixes the workpiece is made of a ceramic material. At the same time, this surface plate is divided into a plurality of parts in the plane direction, and an inverted T is provided at the boundary of each divided part.
An electrical processing device characterized in that a groove having a cross-sectional shape of a mold is formed. (2. The electrical processing device according to claim (1), wherein the surface plate portion is formed in a lip-shaped structure having a cavity for each divided body.