Abstract
Thermally assisted machining (TAM) is evaluated as an efficient method to improve the machinability of the high-strength materials by an external heat source. Generally, in TAM, a single heat source has been applied as an external heat source, such as laser, plasma, and induction. However, in this study, an innovative use of multi-heat sources is newly introduced as TAM of high-strength material such as Inconel 718 to drastically improve the machinability. The novel combination of induction heating and laser is shown to improve the tool life as compared with the single use of heat source. The heating sequence influences the product quality. Moving laser heat source analysis and electromagnetic-thermal coupled analysis using induction heating were carried out to obtain proper depth of cut for TAM, and TAM experiments using the multi-heat sources were performed under the same material removal rate (MRR). Optimal heating sequence and machining conditions by fracture and wear analysis were proposed to reduce harmful thermal effect and to improve the tool life.
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