Metallic Machining Process

1002 Words5 Pages
Metallic cutting process involves various independent and dependent parameters. Independent variables are the input variables over which the machinist has immediate control. Such as type of workpiece material and tool material, condition and size of workpiece material, slicing tool geometry, type of machining process, cutting variables (speed, feed and more detail of cut) and trimming fluids. The type of input parameters selected during machining process decides much about the dependent parameters. The important dependent or output variables are reducing force and power, surface finish, tool wear and tool failure, size and properties of the done product. A small change in input variables, say, cutting parameters, and tool geometry and workpiece…show more content…
Prediction and dimension of cutting forces were given a lot worthy of addressing and researchers began to give attention to this area. This is because reducing force is an effect of the extreme conditions at the tool-workpiece program which interaction can be directly related to many other output variables such as generation of warmth and consequently tool wear and quality of precision machined surface as well as chip formation process and the chip morphology. It may be compulsory to measure makes for certain cases and since enough equations are not available, associated with parameters can't be done analytically and therefore assumptive model should be validated. Several works are available in the literature that produces use of different types of dynamometers to evaluate the forces. The dynamometers being frequently used nowadays for measuring forces are either strain gauge or piezoelectric type. Though piezoelectric dynamometer is highly expensive, this has almost become standard for recent experimental research in metal cutting as a consequence to high accuracy, stability and consistency. Estimation of forces acting between tool and work material is one of the essential aspects of mechanics of cutting process since it is essential…show more content…
This is found that almost all of the mechanised energy is converted into heat during chip creation process that will improve the temperature to high ideals in the cutting sector. The heat made are likely to cause almost all of the technical and economical problems while engineering. During machining heat is made in the reducing zone from three distinctive zones: Primary shear deformation zone (PSDZ), secondary shear deformation zone (SSDZ) and tertiary shear deformation sector (TSDZ). Major part of heat is made due to severe plastic deformation in an exceedingly narrow zone called PSDZ. Further heating is made in the SSDZ anticipated to friction between tool and chip as well as shearing at the chip-tool interface. It is considered that both these zones together account for almost 99% of the total energy converted into heat in the trimming process. A very small fraction of heat is made at the TSDZ due to rubbing between flank of the tool and machined surface. The result of this area comes into play only if the flank wear develops. The TSDZ is therefore neglected when learning unworn tools. The high temperature so made is shared by the chip, cutting tool and the workpiece, the major portion of high temperature being carried away by the flowing chip. While chip is
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