There are many friction parts in a searing machine for household use and the wear by friction influences the action, sound and vibration of it. The influences of the kind, microstructure, case hardening and surface roughness of metals upon the wear of friction parts were tested; the results are briefly summarised as follows:
(1) No great difference was noticed between the pearitic cast iron and ferritic cast iron in the amount of wear in wet friction.
(2) In the cases of water quenching after the heating by high frequency current and hard chromium plating, the deformations are less than by water quenching after carburization.
(3) The wear resistance properties of the oilless bearing metal by powder métallurgy are similar to that of cast iron but much better than that of brass and Cu-Al alloy casting.
(4) The fine finishing of surface of friction parts is required to diminish the wear, particularly that of the beginning of friction.
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