چكيده به لاتين
The use of materials with good and proper mechanical properties in designing and manufacturing different structures is one of the main goals of engineers, but despite the desirable mechanical properties some of these materials are hardly formed and machined or the execution of manufacturing processes on them is not an effective time or economically but this matter has not been an obstacle to using them in the industry at all. Superalloys are among these materials, which have many applications in the aerospace industry and build turbines. Cutting fluids is an inseparable part of different machining processes for superalloys and although the use of these fluids can cause environmental issues, their beneficial effects in machining efficiency improvement cannot be denied. It’s worth noting that there has not been an efficient and proper replacement for conventional cutting fluids as yet and therefore, it's obligatory to improve the way these fluids are used in cutting operations. The high-pressure jet assisted machining method in a hybrid machining set, by applying more efficient cutting fluid to the cutting zone, create many benefits including reduction of tool wear, improvement of surface quality, reduction of temperature of cutting zone and chip separation improvement.
This research is an experimental study of the effect of using high pressure jet assisted machining and compare it with conventional flood cooling on surface integrity improvement and tool wear reduction in nickel base superalloy Inconel 625 turning. In the investigations done, in the flood cooling strategy, the effect of cutting speed and feed rate (each one in three levels) on surface roughness and two main types of tool wear (flank and crater wear) was investigated. In the high-pressure jet assisted turning, the effect of cutting speed, feed and the pressure of the input fluid into the tool nozzle (each one in three levels) on the surface roughness and wear of the tool was studied; and a comparison between the two methods was carried out from a variety of aspects including surface roughness, tool wear, and type of chip.
The results of roughness showed that the use of high-pressure jet fluid made up 43% improvement in surface quality compared to flood method. Also, the tool wear investigation showed that the use of cutting fluid in high pressure compared with flood cooling reduced 74% flank wear and reduced 41% in the worn area of the rake face of the tool (crater wear area). Also, the formation of built-up edges, which is a product of adhesion wear and in some flood strategy machining experiments of this type of alloys is highly produced, by using cutting fluid in high pressure not produced and no effect of it have seen on the tool at all.
