Abstract
Grinding is the main manufacturing process used in finishing operations. Center-less grinding is widely used in the production of auto parts e.g. roller bearings, valve stem and stem of shock absorbers. Center-less grinding is used in large-scale production due to shorter time and higher flexibility. However, the set-up of the grinder is complex and slow, and depends on the operators’ ability. The choice of the best parameters in the process is important to define exactly the cutting strategy and to optimize the process. Current study analyzes the input parameters: feed rate and type of materials on the responses G-ratio, surface roughness, and roundness. Thus, stems of shock absorbers were used as work pieces on the shop floor. Cutting speed and grinding wheel type were constant. The input parameters comprised feed rate and type of materials (1025 and 1045). Responses were surface roughness, roundness error and G-ratio. Results demonstrated that the kinds of tested material was the parameter that most influenced G-ratio and surface roughness. Moreover, feed rate had little influence on the quality of the work pieces, mainly on roundness error.
Highlights
Preparation of center-less grinding machines is highly complex and demand several proceedings to provide perfect conditioning and smooth grinding
It is essential that a setup is prepared to support the work piece and control its rotational motion during the center-less grinding
The installation of a grinder on the surface grinder work table is very important to ensure a stout process without great changes in the setup of input parameters (Wu, Kondo, & Kato, 2005)
Summary
Preparation of center-less grinding machines is highly complex and demand several proceedings to provide perfect conditioning and smooth grinding. Prior to the start of the production of parts, dressing and cleaning are the main activities developed in the preparation of the grinding wheel. The dressing operation aims at cleaning, sharpening, and truing the grinding wheel (Wegener et al, 2011). It is essential that a setup is prepared to support the work piece and control its rotational motion during the center-less grinding. The installation of a grinder on the surface grinder work table is very important to ensure a stout process without great changes in the setup of input parameters (Wu, Kondo, & Kato, 2005)
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