SU1127734A1 - Device for electric discharge machining - Google Patents

Abstract

A DEVICE FOR ELECTROUSING PROCESSING according to a two-sided scheme of curvilinear channels in parts of the type of rotation bodies fixed on the spindle of the dividing mechanism can be rotated, containing a bracket installed with the possibility of swinging around the central axis of the separating mechanism, rotatable shafts of electrode holders with electrodes connected between rotation synchronization mechanisms, characterized in that, in order to increase the shaping accuracy and simplify the design, the axis of the electric holder shafts located tangentially to the circumference described around the central axis of the dividing mechanism, the radius of the specified circle, the distance from the axis of rotation of the electric holder shafts to the center of symmetry of the dividing mechanism and the depth of incision of the electrodes are related by the relations i Un 5-8 (L / C 5 -6, where r is the value of the radius of the circle; 01 is the distance from the axis of rotation of the shaft to the symmetry of the separating mechanism and is the depth of the incision of the electrode. to 00 4

Description

The invention relates to electrophysical and electrochemical processing methods and can be used for electroerosive treatment of wheel-turbines, power sectors and other parts with closed curved channels.

A device for electroerosive processing according to a two-sided scheme of curvilinear channels is known. In parts such as rotary bodies mounted on a spindle of a dividing mechanism rotatably, comprising a bracket mounted for swiveling around the central axis of the separation mechanism, electrodes connected to one another. rotation synchronization mechanisms. The device allows processing of rather narrow interstituting channels without cutting the cylindrical surfaces of the band and the disk 11.

However, the shaping of the profile of the blades is carried out in three stages with the retuning of the machine organs to change the direction and xap iKter of the movement of the electrodes. The conversion of the device during processing to the message of diverse movements increases the labor intensity, the manufacture of wheels and reduces the shaping accuracy.

In addition, the device contains a significant amount of kinematic elements, profile cams, guides, carriages, drawbars, springs, which complicates the design and maintenance of the device.

The purpose of the invention is to improve the shaping accuracy and simplify the design. .

The goal is achieved by the fact that in the device for EDM double-sided curvilinear channels in parts of the type of rotation bodies mounted on the spindle of the separating mechanism can be rotated, containing a bracket installed with a possibility of swinging around the central axis of the separating mechanism, rotatable shafts with the electrodes, interconnected by synchronization mechanisms of rotation, the axis of the shaft of the electrode holders are located tangentially to the circle

described around the central axis of the dividing mechanism, the magnitude of the radius of the specified circle, the distance from the axis of rotation of the shafts of the electrode holder to the center of the sym. The metrics of the separating mechanism and the depth of incision of the electrodes are related by the relations:

 5-8,

а / н 5-6;

where g - is the radius of a circle,

Cr distance from the axis of rotation of the shaft to the center of symmetry of the separating mechanism,

m - the depth of penetration of the electrode.

FIG. 1 shows a device, a general view, in FIG. 2 — view A in FIG. 1 in FIG. 3 is a view B in FIG. 1, in FIG. 4 - the relative position of the electrodes and the processed channels. Figure 5 scan on the blade crown.

The device contains a dividing mechanism 1, on the spindle 2 of which the workpiece 3 is mounted. On the spindle 2 there is a bracket consisting of a stand A and a removable bar 5. On the strap 5 on both sides of the wheel being machined there are shafts 6 installed in rolling bearings. The electrode holders 7 are mounted on the shafts. The axes of rotation of the shafts 6 are located tangentially to a circle of radius i described around the central axis of the dividing mechanism. Shaft axes are located at a distance from the center of symmetry of the separating mechanism.

Between the dimensions, and the magnitude and, showing the plunging depth of the electrode, the ratio

7n 5-8

° 1n 5-6

On shafts 6, pulleys 8 are fixed, successively connected by flexible cable 9, laid in the grooves of pulleys 8 and secured against slipping by screws 10.

The branches of the cable 9 connecting the various-sided pulleys are located parallel to the central axis and pass through the holes 11 made in the bar 5. The cable 9 encloses the pulley 12 and is fixed to the pulleys 13 attached to the drum

five

14, located in the rolling bearings on the strip 5 parallel to the central axis. -,

Drum 14 is rigidly connected to the gauge

15 preloaded by a torsion spring 16

to the copier 17 attached to the housing.

The probe 15 interacts with the profile surface of the copier 17 through the roller 18.

The rotational movement of the electrode holders. Around the axis of the workpiece is communicated from the feed drive 19 through the gear train 20i

The device works as follows. . .

Before processing, the electrode holders 7 are retracted from the wheel blank by an angle, which ensures the installation and mounting of electrodes on them. The electrodes are mounted on the base surfaces of the electrode holders. After turning on the feed drive 19, the strip 5, carrying the electrode holders, rotates around the axis of the workpiece. The probe 15, interacting through the roller 18 with the surface of the copier, rotates the drum 14 and communicates via the cable 8 a synchronous rotation to the shafts 6 and. electrode holder 7 towards each other. The addition of the movement of the rotation of the electrodes around the axis of the workpiece with the movement of rotation dependent on it around the axes of the shafts 6 ensures synchronous displacement of the electrodes along identical trajectories m.

The trajectory of movement of the electrbda provides for the sequential processing of the interscapular canal, the profiling of the back of the scapula and the profiling of the trough of the scapula.

Each of the electrodes is processing a half of the channel with a certain overlap d. After the end of the processing of several channels, the wheel is turned by an angle multiple of the angular pitch of the blades and the raw half of the channels is processed by opposite electrodes, thus forming 33744

the complete interscapular canal is inserted (Fig. 4).

In Fig. 5, in a scan according to the average diameter of the blade rim, 5 shows a sequential mutual arrangement of the axes of rotation of the electrode holders and the electrodes-tools HEY relative to the channels to be processed and the central axis of symmetry.

10 When machining, the electrode holders move in an arc Y around the axis of the workpiece and rotate by the angle Y defined by the profile of the copier. The lead point of the tool electrode

5 M at the same time consistently occupies the coordinates (XQ ..... x,: y ... .y), moving along the trajectory that ensures the processing of the channel to a depth of N. Rotate the electrode tool around

The 0 axes of the electrode holders occur in a plane, perpendicular to the th axis of the blade. ,

The described movements of the electrode tool do not cause trimming of the ban5, even when the workpiece is being processed, if the geometrical dimensions of the device correspond to ratios 5-8 and

In this case, the value is on. initial trimming is not more than

0.01-0.02 mm, which is significantly less than the tolerance on the height of the blade and is comparable only with the required surface roughness.

Thus, the initial trimming does not affect the performance of the processing article.

The device is used to process whole-biased turbine disks and hot-melt alloy. .. . Compared with the known version, the device has increased the reliability of the turbine disks by eliminating the operation of solid banding discs, turning and soldering of the bandage, and reducing the processing complexity.

FIG. 1 f 13 View A

Ft 2 12

Vid

/ J

Fig.Z

/ 7 /

Claims (1)

DEVICE FOR ELECTROEROSE PROCESSING according to a two-sided scheme of curved channels in parts such as bodies of revolution, mounted on a spindle of a dividing mechanism with the possibility of rotation, containing a bracket mounted to swing around the central axis of the dividing mechanism, rotary shafts of electrode holders with electrodes, interconnected by rotation synchronization mechanisms, characterized in that, in order to improve the accuracy of shaping and simplify the design, the axis of the shafts of the electrode holders is located They are tangent to the circle circumscribed around the central axis of the divider mechanism, the radius of the indicated circle, the distance from the rotation axis of the shafts of the electrode holders to the center of symmetry of the divider mechanism, and the penetration depth of the electrodes are related by the relations * 7m> 5-8,% <5-6, where g - value of the radius of the circle / Of - distance from the axis of rotation of the shaft to the center of symmetry of the gear / And - the depth of the electrode. SU. „, 1127734