METHOD OF SHAFT RECOVERY Russian patent published in 2011 - IPC B23P6/02 

FIELD: process engineering.

SUBSTANCE: invention relates to recovery of shaft worn-out journals by machining. Thin-wall split rings or semi-rings are fitted onto pre-machined journals and jointed in place by butt or annular seams to provided interference between journals and said rings. Temporary ring with width of up to 2/3 of shaft width is fitted and locked on one shaft journal with ring rotational axis displaced relative to that of the shaft through 1/2 of shaft radial beat. In making temporary cutting, cut edges should be rounded to chamfer. Said temporary cutting is ground, polished by abrasive tool, processed by surface plastic deformation and aforesaid ring, a strip, is fitted in place. Prior to welding, tack-welding is, first, made at joint center and, then, along its edges. Now, strip opposite edge is welded to shaft journal body by annular seam. Similar seam is produced on strip opposite side for both sides to be, then, machined by blade tool. Finally, strip with welded seams is ground, polished and deformed to produce surface roughness R_a=0.2-0.4 mcm and precision of 5 to 7 quality of shape parametres. Description of invention comprises design relationships for implementation of proposed method.

EFFECT: higher quality of recovered shafts.

4 dwg