Abstract
This paper reports the investigation on parametric optimization of the abrasive aqua jet (AAJ) and cryogenic assisted abrasive aqua jet (CAAAJ) processes for cutting AISI D2 steel using multi objective TOPSIS approach. The input parameters considered were aqua jet pressure, abrasive grit size and jet impingement angle. In this study, depth of penetration, metal removal rate, kerf taper ratio and average roughness were taken as the performance characteristics. The results showed that the CAAAJ process exhibited better performance characteristics than the AAJ process. The AAJ machining process with an inclined jet impact angle influences the output responses, which is evident from an optimal selection of parameters. Besides, the influencing process variables were determined by using the analysis of variance. The overall machining performance of the AAJ and CAAAJ processes were improved by using the optimum process variables through the TOPSIS method.
Highlights
Cryogenic assisted machining is a modern method applied for machining hard materials using low temperature liquids
It is observed that the cryogenic assisted abrasive aqua jet (CAAAJ) machining process increases the machining performance features such as depth of penetration (DOP), material removal rate (MRR), Kerf taper ratio (KTR) and Ra
The output responses of CAAAJ such as the DOP 64.40 mm, MRR 1036.04 mm3/min, KTR 0.9 and Ra 2.01 μm were found at the aqua jet pressure of 225 MPa, abrasive grit size of # 80, and jet impact angle of 80o
Summary
Cryogenic assisted machining is a modern method applied for machining hard materials using low temperature liquids. Cryogenics have distinct characteristics such as harmless, odourless, and colourless. They improve the properties of the materials through the application of low temperature liquids [1,2,3]. Many thermal assistance techniques were developed in machining processes so far. More attention is received from the cryogenic assisted machining techniques, including conventional and unconventional, as the maintenance of stability in material surface and dimensional features. Researchers have employed a cryogenic system in an abrasive aqua jet (AAJ) with different set up routes, such as cryogenic jet machining with replacement of aqua and abrasives using cryogenics (carrier fluid), and abrasive cryogenic aqua jet with substitution of traditional abrasives [4]
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