SU1748986A1 - Device for reconditioning splined surfaces - Google Patents

Abstract

Usage: the field of metal forming, at repair plants when rolling the slots on shafts, in particular when they are repaired. SUMMARY OF THE INVENTION: A device for restoring the splined surfaces of cardan shaft parts is provided with a cylindrical assembly mandrel 9 fixed in the separator 1 with a blind axial bore 21 in which the floating roller 20 and the rollers 12 with annular grooves and prukin rings 26 can be cooperated; 27 of the separator 1 is mounted for reciprocating movement and provided with covers 28.29, one of which, namely the cover 28, is connected with the end face of the separator 1, and the other Single dial 29 provided with beads 30 and with it is associated with a surface of 1.2 separator yl.

Description

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The invention relates to the processing of metals by pressure and can be used in repair shops when rolling up the slots on shafts, in particular, when repairing them.

A device for restoring gears is known, which includes a toothed nickle that is a corrected gear with a module equal to the module of the splines of the gears to be repaired, a conical mandrel made integral with the center of the gears into the opening and the roll-in shaping roller. possibility of movement in the radial direction. However, in such a device, the acting forces of deformation through the forming rollers act on the mandrel seats, which sharply intensifies the wear of the roller and the saddle due to the squeezing of grease and the occurrence of dry friction. Increased wear of the roller and seat lead to the need for their frequent change and, consequently, a decrease in the durability of the mandrel of the device, a decrease in quality indicators and a higher cost of the part. In addition, using the proposed device, it is impossible to restore the splined surfaces of parts such as cardan shafts.

It is also known a device for size-finishing and hardening processing of the slots on the shafts, containing supporting strips made in the form of segments and grasped by a cylinder, between which there is a separator with a set of rollers, the number of which is equal to the number of supporting strips and the number of machined slots. The disadvantage of this device is the impossibility of repairing any worn slots.

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The purpose of the invention is to expand the technological capabilities of the device and improve the quality of the restoration of the splines.

FIG. 1 shows a general view of the device; in fig. 2 shows section A-A in FIG. one.

A device for restoring the slotted surfaces of parts such as cardan shafts is made of separator 1 (see Fig. 1), made cylindrical with two cavities 2.3, delimited by an annular internal protrusion 4. On both sides of the protrusion 4 in cavities 2 , 3 are pressed in angular contact bearings 5, b, and from the cavity 3, the bearing 6 protrudes, resting against the drive holder 7, rigidly connected with the chuck of the screw-cutting machine, transmitting the rotation through the square hole 8 and the holder 7 to the modular roll mandrel 9. Separ Ator 1 has a diametrical bore 10 for installing the trunnions 11 of the profile rollers 12, the number of which corresponds to the number of machined splines of the part 13 (see Fig. 2), and the shape of the profile rollers 12 copies the spline shape of the item being repaired 13. The assembled roll bar 9 (see Fig 1) is made cylindrical, with one end having a square 14 for mounting into the square hole 8 of the drive ring 7, the cylindrical part 15 of the mandrel 9 from the side of the square 14 being pressed into the angular contact bearings 5, 6 and limited to one side 16, not shown, on the other hand, a threaded shank 17 with a nut 18 preventing horizontal movement of the mandrel 9. At the opposite end, the cylindrical mandrel 9 has through-shaped grooves, the number of which is determined by the number of bobbins 19 installed in the mandrel 9, From the end of the mandrel 9 (see FIG. 2) a blind hole 21 is provided for mounting the central floating roller 20. The floating roller 20 (see Fig. 1) comprises a central cylindrical 22 and lateral conical 23, 24 parts, on which, respectively, similar parts of the raskniki 19, and the conical parts 23, are supported, The 24 rollers 20 are not only supporting for the rollers 19. but also serve to prevent the roller 20 from falling out of the blind hole 21 (see Fig. 2), and also prevent the rollers 19 from turning around during operation. The distributors 19 (see Fig. 1) are made with trunnions 25, with annular grooves for installing spring rings 26, which connect the system of three raskatnik 19. In addition, the conical part 23 of raskatnik 19 serves to move the compensating

wear metal splines, and the other 24 - for its fixation. The device also contains a cylindrical body 27 (see Fig. 1) mounted for reciprocating movement along the restored part 13 relative to the separator 1 by interacting with its profile rollers 12 and provided on both sides with covers 28, 29, in one of the

which, namely, in the cover 29, a system of balls 30 is installed, supported on the surface of the separator 1 and ensuring the coaxiality of the device assembly during operation, while the cover 28 communicates with the end of the separator 1, limiting its progress when knurling the splines of the restored part 13.

The device works as follows.

The device is mounted by a drive holder 7 (see FIG. 1) in a chuck of a turning-screw-cutting machine. The part 13 is located on the mandrel, local heating is performed up to 850-900 ° C of the splines and the part 13 moves along the axis in the direction of the arrow P. At the same time, the profile rollers 12 enter into the depressions of the splines of the product 13, at the same time of the carving machine, transmitting rotation through the chuck and the drive holder 7 to the assembled mandrel 9 installed therein. As the workpiece 13 moves, the rollers 19 have a conical surface 23 through the use of a system of three rollers 19 (see Fig.

2), mounted on the central floating roller 20, redistribute the metal from the non-working inner surface of the opening 31 of the part 13 to the worn surfaces of the slots, which leads to a uniform,

qualitative increment of the thickness of the slot throughout its length. At the same time, the housing 27 (see Fig. 1) is rotated by the rotation of the profile rollers 12 in the opposite direction of the restored part.

13 direction. During the reverse movement of the housing 27, the profile rollers 12 emerge from the depressions of the slots of the product 13, the end of the separator 1 abuts against the cover 28, the part is removed from the mandrel, the recovery process

is running out.

Claims (1)

Invention Formula A device for restoring splined surfaces, containing a separator with shaped rollers, enclosing its body, characterized in that, in order to expand the technological capabilities of the device and improve the quality of the restoration of the splines, it is equipped fixed in the separator cylindrical team mandrel with a deaf axial hole, in which a floating roller and roll rollers with annular grooves and spring rings are installed with the possibility of interaction, mn j zo g PI // | J 8 15 6 5 4 9 2U2 AM 23 I am Fig j LL the separator casing is mounted with the possibility of reciprocating movement and provided with lids, one of which is connected with the end face of the separator, and the other one is equipped with a set of balls and with its help connected with the surface of the separator. 25 12 Y. A 111926 h