Machinability

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Paulo J Davim - One of the best experts on this subject based on the ideXlab platform.

  • Machinability analysis in turning tungsten copper composite for application in edm electrodes
    International Journal of Refractory Metals & Hard Materials, 2010
    Co-Authors: V N Gaitonde, S. R. Karnik, M Faustino, Paulo J Davim
    Abstract:

    Abstract Electro-discharge machining (EDM) is widely used in tooling industry, where it is applied on materials, which are too hard to be machined with conventional techniques. The tungsten–copper is broadly used as an EDM electrode for machining of die steel and tungsten carbide workpieces. As, tungsten–copper electrode is more costly than conventional electrodes, there is a need to understand the Machinability aspects in turning of this material. Hence, an attempt has been made in this paper to study the effects of cutting conditions on Machinability characteristics such as cutting force, feed force, depth force, machining force, power, specific cutting force, arithmetic average surface roughness and maximum peak to valley height during tungsten–copper turning with K10 carbide cutting tool. The response surface methodology (RSM) based second order mathematical models of Machinability aspects are developed using the data obtained through full factorial design (FFD). The adequacy of the Machinability models is tested through the analysis of variance (ANOVA). The response surface analysis reveals that a combination of higher cutting speed with low-to-medium feed rate is advantageous in reducing the forces, power and surface roughness, which in turn increases the specific cutting force.

  • new Machinability study of glass fibre reinforced plastics using polycrystalline diamond and cemented carbide k15 tools
    Materials & Design, 2007
    Co-Authors: Paulo J Davim, Francisco Mata
    Abstract:

    Abstract The Machinability refers to the ease or difficulty with which a given composite material can be machined. It is very important to understand the factors affecting the Machinability and to evaluate their effects. This paper aims to investigate the Machinability in turning processes of glass fibre reinforced plastics (GFRP’s) manufactured by hand lay-up. A plan of experiments was performed on controlled machining with cutting parameters prefixed in workpiece. A statistical technique, using orthogonal arrays and analysis of variance (ANOVA), has been employed to know the influence of cutting parameters on specific cutting pressure and surface roughness. The objective is to evaluate the Machinability of these materials in function of cutting tool (polycrystalline diamond and cemented carbide tools). A new Machinability index has been proposed.

  • a new Machinability index in turning fiber reinforced plastics
    Journal of Materials Processing Technology, 2005
    Co-Authors: Paulo J Davim, Francisco Mata
    Abstract:

    Abstract This article presents a study on the Machinability in turning processes of fiber reinforced plastics (FRPs) using polycrystalline diamond cutting tools. Controlled machining experiments was performed with cutting parameters prefixed in the workpiece. A statistical technique, using orthogonal arrays and analysis of variance, was employed to investigate the influence of cutting parameters on specific cutting pressure and surface roughness. The objective is to evaluate the Machinability of these materials as a function of manufacturing process (filament winding and hand lay-up). A new Machinability index has been proposed.

Francisco Mata - One of the best experts on this subject based on the ideXlab platform.

  • new Machinability study of glass fibre reinforced plastics using polycrystalline diamond and cemented carbide k15 tools
    Materials & Design, 2007
    Co-Authors: Paulo J Davim, Francisco Mata
    Abstract:

    Abstract The Machinability refers to the ease or difficulty with which a given composite material can be machined. It is very important to understand the factors affecting the Machinability and to evaluate their effects. This paper aims to investigate the Machinability in turning processes of glass fibre reinforced plastics (GFRP’s) manufactured by hand lay-up. A plan of experiments was performed on controlled machining with cutting parameters prefixed in workpiece. A statistical technique, using orthogonal arrays and analysis of variance (ANOVA), has been employed to know the influence of cutting parameters on specific cutting pressure and surface roughness. The objective is to evaluate the Machinability of these materials in function of cutting tool (polycrystalline diamond and cemented carbide tools). A new Machinability index has been proposed.

  • a new Machinability index in turning fiber reinforced plastics
    Journal of Materials Processing Technology, 2005
    Co-Authors: Paulo J Davim, Francisco Mata
    Abstract:

    Abstract This article presents a study on the Machinability in turning processes of fiber reinforced plastics (FRPs) using polycrystalline diamond cutting tools. Controlled machining experiments was performed with cutting parameters prefixed in the workpiece. A statistical technique, using orthogonal arrays and analysis of variance, was employed to investigate the influence of cutting parameters on specific cutting pressure and surface roughness. The objective is to evaluate the Machinability of these materials as a function of manufacturing process (filament winding and hand lay-up). A new Machinability index has been proposed.

Qasim Murtaza - One of the best experts on this subject based on the ideXlab platform.

  • Machinability of phosphorous containing sintered steels
    Materials Chemistry and Physics, 2001
    Co-Authors: Mohammad Hamiuddin, Qasim Murtaza
    Abstract:

    Abstract Study of the Machinability characteristics of porous sintered materials has received far less attention during the last decades, presumably due to powder metallurgy’s greatest advantage over other manufacturing methods in eliminating completely or minimising greatly machining and also perhaps due to lack of any standard test method developed for Machinability studies. However, many parts because of intricate design, require machining afterwards. Thus, there is a renewed interest in Machinability characteristics of sintered porous materials. Various investigations on Machinability studies of sintered ferrous materials have been reviewed in this study. Finally, the effect of some usual additives and microstructural modification on the Machinability of sintered and heat-treated steels has been examined. The method used was time taken by a drill of standard dimension before it broke down. Increasing C-content was found to have marginal while usual alloying elements like Cu, Ni, etc. had significant effect on Machinability characteristics of sintered steels. It has been concluded that combination of parameters affecting Machinability of P/M materials may prove to be beneficial and effective method to control machining characteristics of sintered steels.

Mohammad Hamiuddin - One of the best experts on this subject based on the ideXlab platform.

  • Machinability of phosphorous containing sintered steels
    Materials Chemistry and Physics, 2001
    Co-Authors: Mohammad Hamiuddin, Qasim Murtaza
    Abstract:

    Abstract Study of the Machinability characteristics of porous sintered materials has received far less attention during the last decades, presumably due to powder metallurgy’s greatest advantage over other manufacturing methods in eliminating completely or minimising greatly machining and also perhaps due to lack of any standard test method developed for Machinability studies. However, many parts because of intricate design, require machining afterwards. Thus, there is a renewed interest in Machinability characteristics of sintered porous materials. Various investigations on Machinability studies of sintered ferrous materials have been reviewed in this study. Finally, the effect of some usual additives and microstructural modification on the Machinability of sintered and heat-treated steels has been examined. The method used was time taken by a drill of standard dimension before it broke down. Increasing C-content was found to have marginal while usual alloying elements like Cu, Ni, etc. had significant effect on Machinability characteristics of sintered steels. It has been concluded that combination of parameters affecting Machinability of P/M materials may prove to be beneficial and effective method to control machining characteristics of sintered steels.

Vadim V Silberschmidt - One of the best experts on this subject based on the ideXlab platform.

  • analysis of a free machining α β titanium alloy using conventional and ultrasonically assisted turning
    Journal of Materials Processing Technology, 2014
    Co-Authors: Riaz Muhammad, Carsten Siemers, Mohammad Sajid Hussain, Agostino Maurotto, Vadim V Silberschmidt
    Abstract:

    Rapid advancements in power generation and aviation industries have witnessed a widespread use of titanium and its alloys in many applications. This is primarily due to their excellent mechanical properties including, amongst other, high strength-to-density ratio, outstanding fatigue properties and corrosion resistance with the ability to withstand moderately high temperatures. However, this combination of properties results in poor Machinability of the material, increasing the cost of components machined with conventional cutting techniques. Recently, Ti 6Al 2Sn 4Zr 6Mo, a modern titanium alloy with improved mechanical properties, has been introduced as a possible replacement of Ti 6Al 4V in aerospace industry. However, its poor Machinability and formation of long chips in conventional turning are main limitations for its wide-spread application. Therefore, a new alloy based on Ti 6Al 2Sn 4Zr 6Mo, namely Ti 6Al 7Zr 6Mo 0.9La, was developed; it shows enhanced Machinability generating short chips during metal cutting, which prevents entanglement with cutting tools improving productivity. To further enhance the Machinability of this material, a novel hybrid machining technique called ultrasonically assisted turning (UAT) was used. Experimental investigations were carried out to study the Machinability, chip shapes, cutting forces, temperature in the process zone and surface roughness for conventional and ultrasonically assisted turning of both alloys. UAT shows improved Machinability with reduced nominal cutting forces, improved surface roughness of the machined workpiece and generation of shorter chips when compared to conventional machining conditions.