JPS5943257B2 - Electric discharge machining equipment for roll-shaped workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for electric discharge machining of a roll-shaped workpiece.

The following explanation will be explained by taking as an example an electric discharge machining apparatus for finishing the outer circumferential surface of a roll-shaped workpiece (hereinafter abbreviated as a roll) to a satin finish by electric discharge. In order to finish the surface of a rolling roll with a satin finish, a method was used in which hard metal particles such as shot or grid were projected onto the polished roll surface to create impressions on the roll surface. Attempts are being made to perform machining by electrical discharge machining.

As is well known, electrical discharge machining involves interposing an insulating liquid, such as white kerosene or kerosene oil, in the narrow machining gap between the electrode and the workpiece, and periodically applying a pulse voltage between the electrode and the workpiece. This is a method of machining the surface of a workpiece by causing electric discharge.

By repeating such electric discharge machining on the roll surface and rotating the roll in the circumferential direction, and at the same time gradually moving the electrode in the direction of the rotation axis of the roll, the roll surface will be continuously subjected to spiral satin finishing, resulting in the above-mentioned The roll surface can be covered with discharge marks.

This is a method of uniformly applying a satin finish to the surface of a roll using electrical discharge machining. The pear-shaped surface obtained in this way not only has a larger difference in unevenness and a much more regular shape than mechanical impressions made by metal particle projection, but the shape also depends on the manufacturing method and hardness of the roll. In addition, the metal structure on the roll surface is hardened by electrical discharge, making it ideal for use as a rolling roll. Fig. 1 is a schematic configuration diagram for explaining a conventional electric discharge machining device that forms a satin surface on the surface of a roll using the electric discharge machining described above. In the figure, 1 is a roll of a workpiece placed horizontally. , 5 is a processing tank that stores the roll 1, 6 is an insulating processing liquid such as white kerosene or kerosene oil, which is stored in the tank 5 together with the roll 1, and 7 is directly above the roll 1 in the figure. 8 is an electrode holding device that holds the electrode 7 perpendicularly to the surface of the machining fluid 6; 12 is an electrode holding device 8 that faces the roll 1 through a machining gap;
This is a head device that moves the head forward and backward in the vertical direction in the figure and performs servo control.

The roll 1 is rotated by a roll rotation drive device (not shown) provided outside the processing tank 5, and the head device 12 moves in the direction of the rotation axis of the roll 1 to finish the roll surface in a matte finish. . In the conventional electric discharge machining apparatus configured as described above, the machining gap between the roll 1 and the electrode 7 must be completely immersed in the machining fluid 6 for fire prevention reasons. In order to do this, the electrode 7 is located directly above the roll 1 and is held perpendicular to the surface of the processing fluid 6, so a large amount of processing fluid 6 is required, and the electrode 7 is located directly above the roll 1. This is an obstacle to the loading and unloading work of the roll 1, and careful handling is required to prevent damage to the equipment, and a large amount of preparation time is required for supplying and draining the machining fluid 6. There is.

As a solution to this problem, for example, there is a method of retracting or reversing the head device 12 by the space required for loading and unloading the roll 1, but the mechanism for retracting or reversing the head device 12 is complicated and large. This was difficult to implement in practice. This invention was made in order to eliminate the above-mentioned drawbacks, and the electrode is opposed to the workpiece from the opening of the machining tank, and the distance between the electrode and the machining liquid level is 0 plus θ.
By maintaining the inclination angle θ that satisfies the following relational expression and servo-controlling this electrode parallel to the machining fluid level, machining can be performed even when the machining fluid in the machining tank is less than conventional equipment. The purpose of this invention is to provide a device that can carry rolls into and out of a processing tank in a short time.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

FIG. 2 is a schematic configuration diagram showing the device of this invention, and FIG. 3 is an enlarged view of the main parts. In the figure, 1 is a roll of the workpiece;
2, 2″ is a bearing that supports the roll 1 in a horizontal state;
4 is a roll rotation drive device that rotates the roll 1 via the shank 3, 5 is a machining tank in which the roll 1 is immersed in a machining fluid 6, and 7 is a plurality of machining tanks. As shown in detail in FIG. 3, this electrode 7 is connected to the roll 1 from the opening of the processing tank 5.
The electrode is held by an electrode holding device 8 at an inclination angle θ that satisfies the relational expression 00<θ<900 with respect to the machining liquid level and to form an electric discharge between the electrode and the roll 1. 9 is an electrode feeding device that feeds the electrode 7 along the guide portion 10 of the electrode holding device 8; 11 is a device that fixes the electrode 7 to the electrode holding device 8 using the output of a detection device to be described later; 12 13 is a head device for moving the electrode holding device 8 back and forth; 13 is a head traverse drive device;
By rotating the head device 12, the roll 1 is rotated.
This is to move it in the axial direction.

15 is a power supply device that applies a pulse voltage between each electrode 7 and the roll 1; 16 is a control device; It includes a device 18 for stopping the electrode feeding device 9 based on the output of the detection device 17, and a device 19 for actuating the fixing device 11 based on the output of the detection device 17.

It has been confirmed through experiments that the inclination angle θ of the electrode 7 with respect to the liquid application surface is 30 to 45 degrees.

Reference numeral 20 denotes a roll diameter snooping device that operates as described below; 21 a drive device that advances and retreats the snooping device 20 within a certain length; and 22, a movement of the head device 12 when the snooping device 20 and the roll 1 come into contact with each other. This is a device that stops the

Note that the drive device 21 is composed of, for example, a hydraulic cylinder, etc., and the snooping device 20 is arranged so as to form a predetermined angle with the extending direction of the electrode 7, and is configured to be able to come into contact with the surface of the roll 1. . In the apparatus of the present invention constructed as described above, in order to finish the roll surface with a satin finish, the electrode holding device 8 is moved back by the head device 12 and the processing tank 5 is moved back.
A space is provided above the processing tank 5, and the roll 1 is carried into the processing tank 5.

Next, the head device 12 is advanced in the direction of the roll 1. In this case, the roll diameter snooping device 20 is extended to a certain length, and this snooping device 20 comes into contact with the surface of the roll 1,
The stop device 22 is activated to stop the head device 12 from advancing. Thereafter, the electrode 7 is inserted into the guide portion 10 of the electrode holding device 8 (this operation is not necessary if the electrode 7 is already inserted), and the electrode 7 is fed in the direction of the roll 1 by the electrode feeding device 9. A detection device 17 detects that the electrode 7 and the roll 1 are in contact with each other.
detect it and stop the electrode feeding device 9 based on its output,
The fixing device 11 is activated to fix the electrode 7 to the electrode holding device 8. Thereafter, the snooping device 20 is retreated, and the head device 12 is also retreated to move the electrode holding device 8 in a direction away from the roll 1, thereby forming a gap equal to or larger than the machining gap between the electrode 7 and the roll 1.

The positioning work of the electrode 7 is thus completed, and then the machining liquid 6 is poured into the machining tank 5 until the machining gap between the electrode 7 and the roll 1 is sufficiently submerged. The matte finish on the roll surface by electrical discharge machining may be performed in the same manner as in the case of conventional equipment. After the electrical discharge machining is completed, the electrode holding device 8 is moved by the head device 12.
is moved backward again and the roll 1 is carried out. As shown in FIG. 3, a specific example of the electrode feeding device 9 is as shown in FIG. Further, a specific example of the fixing device 11 is a device that operates a hydraulic cylinder and presses and fixes the electrode 7 to the guide portion 10 of the electrode holding device 8 by the hydraulic pressure. is possible. Furthermore, in the above embodiments, the case where the present invention device is applied to an electric discharge machining device that finishes the outer surface of a roll with a satin finish has been illustrated and explained, but the present invention is not limited to this and various design changes are possible. be. As explained above, in the apparatus of the present invention, a roll-shaped workpiece is stored in a processing tank having an opening, and a machining liquid is interposed between the roll-shaped workpiece and an electrode. The workpiece is subjected to electric discharge machining, and the electrode is opposed to the roll-shaped workpiece from the opening of the machining tank, and the relational expression 00<θ<900 is satisfied between the electrode and the machining fluid level. In an electric discharge machining apparatus for a roll-shaped workpiece, the electrode is held at an inclination angle θ of When the head device advances toward the roll-shaped workpiece, a tip portion of the head device on the side opposite to the roll-shaped workpiece is provided.
Since it is equipped with a roll diameter inspection device that extends to a certain length and comes into contact with the roll-shaped workpiece, it is possible to significantly reduce the amount of machining fluid, which is effective for fire prevention. It has the advantage of shortening the liquid supply and drainage time, and by moving the electrode forward and backward parallel to the machining liquid level, a space can be created above the machining tank, making it easier to carry in and out the rolls. In addition to shortening the supply and drainage time of machining fluid, it is possible to provide a device that can perform electrical discharge machining on workpieces safely in a short time. It is easy to obtain the desired machined part of a roll-shaped workpiece due to changes in the roll diameter, and it also eliminates the drawback of electrode vibration caused by uneven electrode feeding length, resulting in stable machining. That's what you get.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram for explaining a conventional device, FIG. 2 is a schematic configuration diagram for explaining an embodiment of the present invention, and FIG. 3 is a diagram for explaining the main part of FIG. 2. . In the figure, 1 is a roll-shaped workpiece, 5 is a processing tank 6 is a processing liquid, 7 is an electrode, 8 is an electrode holding device, and 12 is a head device.

Claims (1)

[Claims] 1. A roll-shaped workpiece is housed in a machining tank having an opening, and a machining fluid is interposed between the roll-shaped workpiece and an electrode to electrical discharge machine the roll-shaped workpiece. , the electrode is opposed to the roll-shaped workpiece from the opening of the processing tank, and the angle between the electrode and the processing liquid level is 0°.
Maintain an inclination angle θ that satisfies the relational expression <θ<90°,
In an electric discharge machining apparatus for a roll-shaped workpiece, the apparatus is configured to advance and retreat the electrode in parallel with the machining liquid level, and a head device for advancing and retracting the electrode with respect to the roll-shaped workpiece; A roll diameter snooping device is disposed at the tip end on the side facing the roll-shaped workpiece and extends to a certain length and comes into contact with the roll-shaped workpiece when the head device advances toward the roll-shaped workpiece. An electrical discharge machining device for a roll-shaped workpiece, characterized by comprising: