Effects of hard chrome and MoN-coated stainless steel on wear behaviour and tool life model under two-body abrasion wear testing

The objectives of this study were to investigate the effect of the electroplated hard chrome (HC) and the MoNcoated AISI 316 stainless steel coatings on weight loss under two-body abrasion wear testing and to predict the tool life of both materials used as a fishing net-weaving machine component, namely the hook. Both materials were used to carry out the wear experiments under two-body abrasion behavior. These specimens were wear tested with the in-house wear testing apparatus base on ASTM: G133-05 standard. The Taylor’s equation was used to formulate the tool life model whereas the Monte Carlo simulation was used to predict the tool life of the machine part. The results showed that the MoN-HC exhibited higher wear resistance than that of the HC

Effects of hard chrome and MoN-coated stainless steel on wear behaviour and tool life model under two-body abrasion wear testing

The objectives of this study were to investigate the effect of the electroplated hard chrome (HC) and the MoNcoated AISI 316 stainless steel coatings on weight loss under two-body abrasion wear testing and to predict the tool life of both materials used as a fishing net-weaving machine component, namely the hook. Both materials were used to carry out the wear experiments under two-body abrasion behavior. These specimens were wear tested with the in-house wear testing apparatus base on ASTM: G133-05 standard. The Taylor’s equation was used to formulate the tool life model whereas the Monte Carlo simulation was used to predict the tool life of the machine part. The results showed that the MoN-HC exhibited higher wear resistance than that of the HC

Experimental and simulated datasets

The surface quality of the machined samples was effectively employed as a criterion for monitoring cutting tool deterioration of Al2O3+TiC and TiN+AlCrN tool inserts. The experimental dataset includes surface roughness of the machined samples after turning operation for different cutting speeds and feed rates with different cutting times (5, 15, 30, 45, 60 and 75 min). The format of dataset was .xlsx Microsoft® Excel file as shown in Table 1.The format of dataset of Ra versus cutting time by varying cutting speeds and the dataset of Ra versus cutting time by varying feed rates during turning workpiece samples using both tool inserts was .mpj Minitab® files as shown in Fig. 2 and Fig. 3.Monte Carlo simulation was used to assess the effects of cutting speed and feed rate on tool life by generating 10,000 simulated values from normal distribution. Based on tool life equations for both tool inserts, tool life values were generated by varying cutting speeds below (-10% and -5%) and above (5% and 10%) the cutting speed of 220 m/min while keeping the feed rate constant at 0.06 mm/rev. Similarly, tool life values were generated by varying feed rates below (-10% and -5%) and above (5% and 10%) the feed rate of 0.06 mm/rev while keeping the cutting speed constant at 220 m/min. The format of all simulated datasets was .mpj Minitab® files as shown in Figs. 4-7.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Enhancement of surface integrity in cryogenic high speed ball nose end milling process of inconel 718

Surface integrity of machined subsurface in any machining process has become an important aspect because of increased quality demands especially in high accuracy demand industries like aerospace, automotive, defense and medical applications. The attention of these industries is to achieve a good surface roughness, avoid plastically deformed layer and most cases increasing the hardness at the subsurface area for robust application. As is known, Inconel 718 is a difficult-to-machine material and it is often used in the manufacture of turbine gas and jet engines for aerospace applications. In most cases, Inconel 718 machining will be resulting an excessive heat generated at the cutting zone. This can cause in a variety of problems during machining such as rapid tool wear, damage on machined surface and microstructural defects. Hence, various cooling methods have been made to address these problems and improve the quality of machined surface. In this study, a cryogenic cooling technique using nitrogen liquids (LN2) was developed to cool the tool-chip interface during milling Inconel 718. The goal of this paper is to presents a comparison study on surface roughness, machined surface microhardness and subsurface microstructure changes between cryogenic cooling and dry techniques. The experiments conducted using a PVD coated with TiAlN/AlCrN ball nose tungsten carbide for varying cutting speeds ranging between 140–160 m/min, a feed rate of 0.15-0.20 mm/tooth, and radial depth of cut of 0.2-0.4 mm. The results revealed that the cryogenic cooling technique is more effective than dry cutting for improving surface roughness and lessening deformation of microstructure changes underneath the machined surface. However, machining in dry technique has produced a high microhardness for machined surface compared to cryogenic cooling technique. Overall, the utilization of the cryogenic technique has improved the surface roughness to a maximum of 88% and reduced the plastic deformation layer, while dry machining can improve the surface microhardness up to 5%