Experiment Research On The Friction And Wear In The Cutting Of Titanium Alloys

Titanium alloys have been widely used in aerospace, medical treatment, and chemical because of its good high temperature resistant, corrosion resistant and best mechanical properties. Howere, as one of typical difficult-to-cut materials, rapid tool wear is the bottlentek which restricts the enhancement of machining efficiency. In this dissertation, taking TC4 as research object, some exploratory researchs on friction and wear in the cutting of Titanium alloys with cement carbide were carried out in different cooling and lubricating, different thermoelectric circuit conditions. The major research works were included as follows:1. The friction and wear experiments of WC-Co/TC4 were carried out in different cooling and lubricating conditions. The performance and mechanism of Dry, Cryogenic Wind, Static Electricity, MQL and CMQL were analysed. The tests results showed that SE, MQL and CMQL can obviously reduce the friction coefficient of pair, volume loss of WC-Co and the roughness of TC4 friction face.2. The friction face of WC-Co was observed by SEM and EDX. SE can reduce friction and wear of pair because it can provide enough Oxygen hydronium to friction area, which increased probility of forming stabilization Oxide on the friction face and prevent the adhesion of pair materials. Under the condition of MQL and CMQL, atomization oil can easily get to the firction face and form adsorption oil film, which can reduce friction and wear.3. The friction and wear tests of WC-Co/TC4 were carried out in different thermoelectric circuits. The effect of thermal current to the pair was investigated through analyzing the friction coefficient, volume loss, the wear mechanism of WC-Co and the roughness of TC4 friction face. The tests indicated that thermal current can accelerate the adhesion process of pair materials.4. The high speed turning TC4 tests were carried out in Dry, CW, SE, MQL, CMQL and Open thermoelectric circuits. The influence of cooling, lubricating and open thermoelectric circuits to the friction coefficient of rake face, tool wear and the roughness of machined surface was investigated. Tools wear characteristic and microcosmic wear mechanism was also analysed. The tests result is that SE, MQL,CMQL and Open thermoelectric circuits can effectively restrain tool wear.