Seal assembly manufacturing methods and seal assemblies manufactured thereby
View Patent ↗Finishing a seal assembly as a unit is proposed, which prevents alignment of the end gaps of the annular body and the annular ring of the seal assembly, provides the ability to manufacture the seal assembly to very low tolerances, and establishes virtually perfect parallelism between the upper and lower surfaces of the seal assembly. A finishing process is characterized by lapping a seal assembly as an assembled unit with a lapper using gritted oil as a polishing medium.
1. A method comprising steps of:
providing a seal assembly comprising an assembly of an annular body and an annular ring;
finishing the seal assembly to desired tolerances by lapping the seal assembly, wherein the step of lapping the seal assembly comprises:
providing a lapper having a top plate and an opposing bottom plate having a central rotated shaft and an outer perimeter edge;
providing a carrier disposed on the bottom plate meshingly interacting with the outer perimeter edge and the central shaft of the bottom plate;
disposing the seal assembly into the carrier;
bringing the top plate into a working relationship with the bottom plate sandwiching the carrier and the seal assembly therebetween;
introducing gritted oil to the top and bottom plates; and
rotating the top plate, in which rotation of the top plate imparts rotation to the carrier and orbital movement of the carrier over the bottom plate about the rotated shaft.
2. A method comprising steps of:
providing a seal assembly comprising an annular body that is severed forming a first end gap and an annular ring that is severed forming a second end gap, in which the first and second end gaps are aligned;
providing a lapper having a top plate and an opposing bottom plate having a central rotated shaft and an outer perimeter edge;
providing a carrier disposed on the bottom plate meshingly interacting with the outer perimeter edge and the central shaft of the bottom plate, the carrier having a hole extending therethrough and a spacer projecting into the hole;
placing the seal assembly into the hole disposing the spacer at the first and second end gaps;
bringing the top plate into a working relationship with the bottom plate sandwiching the carrier and the seal assembly therebetween;
introducing gritted oil to the top and bottom plates; and
rotating the top plate, in which rotation of the top plate imparts rotation to the carrier and orbital movement of the carrier over the bottom plate about the rotated shaft.