METHOD OF RESTORING ELONGATED WORN SPLINED SHAFTS WITH CYLINDRICAL STEM Russian patent published in 1999 - IPC

FIELD: plastic metal working, namely repairing semiaxles of rear-axle assemblies of trucks by hot upsetting in specialized service stations. SUBSTANCE: method comprises steps of welding cylindrical compensation member to non-working end of splined shaft, selecting length value of compensation member according to volume of worn metal and allowances for cutting. Shaft is heated in zone of splined surface until temperature of metal yielding and it is placed in die set with split lower die movable in horizontal plane. Lower die has annular cylindrical reception zone whose width is equal to horizontal stroke of die. Shaft is clamped and centered in die set along cylindrical surface of its stem by means of wedge mechanism. Then shaft is upset in split die with use of punch by effort whose value is determined according to given relationship. Stem of shaft is clamped by effort that surely exceeds upsetting effort. Upsetting operation is performed in press with vertical effort whose value is determined according to given relationship. EFFECT: enlarged manufacturing possibilities, enhanced quality of product. 4 dwg