SYSTEM APPROACH

SYSTEM APPROACH

ABSTRACT:

A system approach for the use of vitrified bonded superabrasive wheels for precision Production grinding.

System approach is a technique in which we are not only concentrate the process itself but we have to concentrate on various factors which influences the output of the system. It is nothing but approaching towards system by considering all factors (i.e. input variables) of that system.

It can be applied to any type of process or system. In this paper we are considering system approach for the precision grinding. The system approach is described in this paper attempts to illustrate the need to pay attention to all aspects of the grinding system simultaneously. This is departure from conventional approaches, where grinding wheel is “consumed” and made tolerant of serious deviations in other parts of the grinding system. The various input variables influence grinding process are machine tool factors, work material factors, wheel selection factors, and operational factors. Each of these factors includes number of variables. To achieve better surface quality, consistent part geometry, lower total cost /part, we have to consider above factors simultaneously.

In this paper in wheel selection factor, we selected CBN (cubic boron nitride) wheels, instead of conventional abrasive wheels. CBN is second hardest material having high hardness, thermal stability, chemical inertness, and high thermal conductivity. For higher material removal rate coarser grit and for final surface finishes finer grit is required. Wheel life and surface finish can be improved with CBN concentration. For optimum results CBN wheels should have controlled porosity. Proper size, shape and geometry of wheels as per requirement should be used. In operational factors we designed the grinding cycles for CBN, which save time and avoid dwell and spark out. Wheel performance is also influenced by use and control of coolant flow, direction and velocity. System approach the described has been successfully utilized for fuel injection, aerospace component, automotive parts, gear components and others. This system approach integrates input variables and end results are desired quality geometry, surface finish and low cost.


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