Method of producing spray deposit on bearing boss

Abstract

Prior to forming a thermal spray coating layer (28) on an end face (23B′) of a structural base material (23′) to be shaped into a boss, firstly an inner masking member (32) is fitted in an original hole (23A′) of the structural base material (23′) and then an outer masking member (33) is fitted on outer peripheral side of the structural base material (23′). In the next place, by the use of a hard material, a thermal spray coating layer (28) is formed on an annular coating area (23B1′) which is exposed between the inner and outer masking members (32) and (33). Surface areas on the end face (23B′) of the structural base material (23′), corresponding to an allowance range of a machining operation by which the original hole (23A′) is ultimately shaped into a joint pin hole of a specified diameter, are left as a non-coating area (23B2′) free of the thermal spray coating layer (28). Therefore, the original hole (23A′) in the structural base material (23′) can be machined into a final joint pin hole by means of a cutting tool, without experiencing cracking troubles which would otherwise occur to the thermal spray coating layer (28) during the machining operation.

Dependencies are inferred from the claim text.