In this study, drilling of unreinforced polyamide and carbon black reinforced electrically conductive polyamide was performed with drill tools having different drill point angle at different cutting speeds and feeds. The surface roughness of drilled holes was measured and the chip forms were investigated. The experimental studies were designed by utilizing Taguchi L₉ orthogonal series in order to obtain optimum drilling parameters and analysis of variance (ANOVA) statistical method was used to specify the effects of the process parameters on the surface roughness.
Sheet molding compounds (SMC) are alternative materials in manufacturing of structural components, automotive components and electrical resistant parts, due to their high strength, light weight, easy formation and low material cost. However, machining is demanded as a secondary process for achieving the final shape of the part for assembly. During machining of SMC composites, some problems are faced because of the different machining characteristics of polymer matrix and fiber reinforcement. In this study, commercial SMC composite including 25 wt.% polyester, 30 wt.% glass fiber and 45 wt.% calcium carbonate, was milled under different depth of cut, feed and cutting speed. Taguchi experimental design was used to determine the effectiveness of the parameters. After the slots were milled, the roughness of the machined surfaces was investigated and it was found that lower feed, higher depth of cut were more effective than cutting speed in decreasing surface roughness.
Stainless steel materials have been used in many fields such as automotive, food, medical, chemistry etc. by applying machining operations although they are categorized under a group of materials whose machinability is difficult due to high strength, low thermal conductivity and work hardening tendency during machining. It is possible that these materials can be machined by using various cutting fluids, but cutting fluids have disadvantages such as being harmful to the environment and health. In this study, it is intended that the minimum quantity lubrication method is applied by using commercial vegetarian cutting fluid and uncoated and TiN coated WC cutting tools during milling of AISI 304 (austenitic stainless steel) and AISI 420 (martensitic stainless steel) materials and the sustainable machining is realized. Milling operations will be repeated even by applying the dry machining for the purpose of being able to compare the results obtained from minimum quantity lubrication method. The workpiece surface roughness and chip forms were investigated.
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