SU250338A1 - Two-station electric spark machine for grinding inner cylindrical surfaces of products such as stators of electric machines - Google Patents

Description

Electroerosionic two-position machines are known for decoding internal cylindrical surfaces of parts, for example, stators of electric machines in their manufacture, containing mechanisms for the base and rotation of workpieces and mechanisms for transferring the electrode electrode of the tool. However, these machines do not provide stable indicators of the magnitude of the magnetic asymmetry of the stator due to uneven removal of allowance due to the misalignment of the base and machined surfaces. The purpose of the invention is to improve the geometric accuracy of surface treatment with a uniform removal of allowance relative to the axis of the stator package. This is achieved by the fact that the mechanism of basement and rotation of the surfaces to be machined is complete in the form of fixed mandrels, the diameters are smaller than the diameter of the hole in the workpiece, with diameters of these diameters in the middle part underestimated by 0.30.5 mm opposite lines of the longitudinal stroke of the electrode tool. In addition, the mandrel at the machining position of the hole is made hollow with a through groove, and the mechanism for the far-lateral movement of the tool electrode contains a rolling pin that carries the electrode tool and is located inside the frame on the side opposite to the free end of the mandrel through which the workpiece is worn. This difference provides convenience and quick removal of the product for measurement. Fig. 1 shows a kinematic diagram of the described machine; in fig. 2 is a view along arrow A in FIG. one; in fig. 3 is a view along arrow B in FIG. 2; in fig. 4 - mechanism for longitudinal-transverse feeding of the electrode tool; in fig. 5 - base unit of the workpiece. The machine contains an irodol-transverse tool-electrode feed mechanism consisting of a lead screw 1 with a nut 2 inserted into the guide 3. The nut 2 is equipped with a finger 4 attached to the other end of the carriage 5 passing through the hole of the carriage body 6. On the opposite side the carriage body 6 has a cam 7 with two adjusting contacts 8. The carriage 5 has holes, into which bearings 9 are inserted, moved along axis 10 and 11 and simultaneously moving the rolling pin 12 with the tool electrode installed in the bottom hole of the carriage 5. The transverse flow of the electro-instrument-tool is made from the gearbox, consisting of gears 13, screws 14, support roller 15, springs 16, flywheel 17 / with limb 18,

The mechanism for locating and rotating the workpiece contains a faceplate 19 on which the support roller 20 is mounted, the bracket 21 with the drive pulley 22 and guides the rollers 23 on which the elastic drive 24 is worn, the latch handle 25 with the support plate 26.

An internal mandrel 27 with an electrode-tool (9m 28) is inserted into the internal cavity of the faceplate 19. The reciprocating movement of the electrode-instrument 28 is driven by the electric motor D. The elastic actuator 24 is rotated for the processed products in the first position from the DS electric motor and in the second position - from the Dj electric motor

Electro-erosion polishing of internal surfaces of products is performed as follows.

The workpiece is mounted on the mandrel 27 and pressed with an elastic drive 24 to the base surfaces of the mandrel 27. The product is rotated by pulling the elastic Drive 24, the rotation of which is produced from the D2 electric motor at one position and the electric motor of the other position through V-belt transmissions.

The longitudinal feed of the tool electrode is carried out by moving the carriage 5 along the axes 10 and 11. The cross feed of the electrode tool 28 is performed by turning the flywheel 17, whereby the screws 14 and the support finger 4 are lowered down, the carriage 5 with the carriage body b is rotated around an axis 10 serving

the workpiece rolling pin 12 with the electrode tool 28.

As a result of the application of the proposed machine, the electrode bypass tooling the machined surfaces of products along the cylinder is ensured due to the fact that the product has a rotational movement and the electrotool is reciprocating along the shape of the cylinder described by the surface being treated. . It is working; the electrode is fed in the direction normal to the surface being processed, thereby providing the necessary gap between the electrode tool and the surface being treated, changing due to material removal from the surface being processed and wear of the electrode tool.

Claims (2)

1. Electroerosive two-position machine for grinding internal cylindrical surfaces of products, such as stators of electrical machines, containing mechanisms for basing and rotating workpieces and mechanisms for moving an electrode-tool, characterized in that, in order to improve the geometric accuracy of the surfaces when the allowance is uniformly removed relative to the package axis the stator, the mechanism of the base and rotation of products is made in the form of fixed mandrels, the diameters of which are smaller than the diameter of versts in the workpiece with these diameters in the middle part underestimated by 0.3-0.5 mm and with the location of the line of fit of the workpiece that is diametrically opposite to the line of the longitudinal stroke of the tool electrode. 2. Stack according to claim 1, characterized in that, in order to provide convenience and speed of removal of the item for measurement, the mechanism of longitudinal-transverse movement of the electrotool contains a rolling pin that carries the processing electrode and is located inside the frame on the side opposite to the free end of the mandrel, through which put on the product. FIG. View/ 2 jjj gp - g ashes th -Hfld