Device and method for metal stitching

摘要

A device and method for metal stitching of castings and similar structures utilizing a lock insert for strengthening and stabilizing the repaired location and sealing pins for completing the sealing repair of the casting. The lock insert comprises at least one center lobe which is coupled to a plurality of radially smaller locking lobes and a plurality of connecting lobes which are radially smaller than the locking lobes. Each lobe has a cylindrical body and is connected to adjacent lobes to form a locking groove, the composite structure being adapted for insertion into a slot within the repair site which conforms in cross section to the cross section of the insert lock. Insert lock geometry provides full sealing contact around the total body of the lock insert. A sealing pin is provided which includes a head and a threaded shank. The shank is comprised of sectional components including a program shear plane, an upper wedge member and a threaded shank section extending downward therefrom. Also provided is a lower wedge member which operates to develop a crushing effect at the upper and lower threads of the pin to develop an improved seal with respect to the repaired crack in the casting. Methods for use of the lock insert and sealing pin are also disclosed.