Cryogenic Turning of AISI 304 Stainless Steel with Modified Tungsten Carbide Tool Inserts

This research work has been conducted to study the influence of process parameters and cooling lubrication method in turning of AISI 1045 under finishing conditions. Tests have been performed in dry conditions (dry cutting, DC), using the minimal quantity lubrication technique (MQL), and also in flood cooling (FC) conditions, using a carbide insert tool. Work is concentrated on statistical modeling to develop an appropriate approximating model between response and independent variables using Design Expert 8.0 software. Response surface methodology and analysis of variance were used for the experimental design. Cutting depth, feed rate, spindle speed, cutting fluid type, and flow rate were considered as independent variables. Analysis of variance (ANOVA) was used to determine the effect of machining parameters on surface roughness, their individual contribution, and the effect of their interaction. Mathematical linear regression was proved to be the most appropriate method in order to approximate the relationship between surface quality and finish turning process parameters. Numerical and graphical optimizations show the minimal level of depth of cut, the maximum cutting speed, and the maximum lubricant flow rate resulted in a better quality of machined surface.

Section: Please Scroll Down For Articlementioning

confidence: 99%

Investigation of the Influence of Process Parameters and Cooling Method on the Surface Quality of AISI-1045 during Turning

Frăţilă

Caizar

2012

“…Direct application of cryogen in the cutting zone can reduce the coefficient of friction between sliding surfaces, reduces the cutting forces, increase the hardness of work piece and cutting tool, and lower down the welding tendency of tool and work piece material [24]. In this respect, Dhananchezian et al [25]performed the cryogenic machining of a ferrous alloy using WC inserts. In comparison to wet mode, cryogenic turning reduced the surface roughness by 20 to 30%.…”

Section: Introductionmentioning

confidence: 97%

Environment Friendly Machining of Ni–Cr–Co Based Super Alloy using Different Sustainable Techniques

Chetan

Ghosh

Rao

2015

In order to eradicate the use of mineral based cutting fluid, the machining of Ni-Cr-Co based Nimonic 90 alloy was conducted using environment friendly sustainable techniques. In this work, uncoated tungsten carbide inserts were employed for the machining under dry (untreated and cryogenically treated), MQL and cryogenic cutting modes. The influence of all these techniques was examined by considering tool wear, surface finish, chip contact length, chip thickness and chip morphology. It was found that the cryogenically treated tools outperformed the untreated tools at 40 m/min. At cutting speed of 80 m/min, MQL and direct cooling with liquid nitrogen brought down the flank wear by 50% in comparison to dry machining. Similarly at higher cutting speed MQL and cryogenic cooling techniques provided the significant improvement in terms of nose wear, crater wear area and chip thickness value. However, both dry and MQL modes outperformed the cryogenic cooling machining in terms of surface roughness value at all the cutting speeds. Overall cryo treated tools was able to provide satisfactory results at lower speed (40 m/min). Whereas both MQL and cryogenic cooling method provided the significantly improved results at higher cutting speeds (60 m/min and 80 m/min) over dry machining.

“…In this regard, several studies were conducted to enhance the machining of hard to cut materials (such as titanium alloys, stainless steels, nickel-base alloys, cobalt-base alloys, etc) [10][11][12][13][14]. In a research work, Venugopal [12] showed that implementation of cryogenic cooling in turning of Ti alloy decreases tool wear and enhances tool life by 140%.…”

Section: Introductionmentioning

confidence: 98%

Experimental Study on Hybrid Cryogenic and Plasma-Enhanced Turning of 17-4PH Stainless Steel

Khani

Farahnakian

Razfar

2014

This paper presents machinability of 17-4PH stainless steel using a hybrid technique composed of plasma-enhanced turning (PET) and cryogenic turning (CRT). First of all, using some primary experimental tests and nonlinear regression, a mathematical model was developed for surface temperature of uncut chip as a function of plasma current and cutting parameters. Then, the influence of cutting speed (V c ), feed (f) and surface temperature of uncut chip (T sm ) were studied on surface roughness (R a ), cutting force (F z ) and tool flank wear (V B ). The results show that hybrid turning (HYT) is able to lower main cutting force and tool flank wear in comparison with conventional turning (CT). In addition, surface roughness was improved except for high level of surface temperature of uncut chip. However, hardness measurement of machined workpiece showed that hybrid turning does not change hardness of machined surface.