Materials Design and Performance Evaluation of Porous Sintered Metal Rings for Spinning Frame

Part 3: Machinability

抄録

The influences of the compounding ratio of sintered MoS₂ and FeMn on cutting resistance, plastic flow of sample surface roughness, air permeability and wear of tool were studied experimentally for the purpose of improving the surface characteristics of iron based sintered ring for spinning frame. The result obtained are as follows;
(1)It has been confirmed that the machinability of iron based sintered alloy varies to a cosiderable extent depending on the compounding ratio of the sintered auxiliaries MoS₂ because of the lubricating effect of it.
(2)It has been shown that, because the cutting resistance diminishes with an increase of MoS₂ basically, the layer subject to deformed layer on the surface of the sample gets thinner and the air permeability improves accordingly.
(3)The surface roughness regularly changes according to the amount of cutting. Especially with MoS₂ content of 67% or over the surface roughness improves and remains unchanged even with an increase in the amount of cutting.
(4)At MoS₂ content of 59% or machinability drops causing greater wear of the tool. On the other hand at MoS₂ content of 71.4% or over occurrence of built-up was observed at the top of the component cutter.
(5)It has been proved that a MoS₂ content of 60-70% is desirable, by judging globally from air permeability surface roughness and wear of tool.