DESIGN AND FABRICATION OF BAR POLISHING MACHINE – Mechanical project

Abstract

Polishing is one of the oldest processing method used to generate smooth and shiny surface. This smoothness is obtained by rubbing the surface with the polishing particles with a rotating disk. Polishing particles removes small elements of the surface and make them smooth. In a bar polishing machine polishing wheel spins at high speed in a plane perpendicular to the surface to be machined. The depth of cut is governed by the sliding motion of cutter carrier. In this machine three motors are used, one is used for spin the tool and other two are used for sliding tool post in two directions. The tool is travel in three directions (X, Y, Z direction). The 0.25HP and 1550 rpm motor is used for the rotating the tool. The tool used for polishing is Flap disc with 80 and 120 grade. Flat shaped square or rectangular solid as well as drilled work piece are polished by this machine.

INTRODUCTION

Now a days it is necessary to increase production rate continuously in order to achieve higher production rates with minimal of human input, there is need to develop innovative machinery to cater the above needs. Polishing operation is mainly done on the face of the components which is similar to polishing with the view to improve the surface finish of the components. The polishing operation is presently done by mounting an abrasive disk on the spindle of a hand grinder and feeding this rotating disk against the job surface. Polishing is the process of creating a smooth and shiny surface by rubbing it or using a chemical action, leaving a surface with a significant secular reflection. Polishing is a multistage process.

The first stage starts with a rough polishing and each subsequent stage uses a finer emery paper of different grades until the desired finish is achieved. In this stage metal removal takes place. Then in second stage we come across the Fine polishing in which minimal or negligible metal removal takes place. It is mainly used to remove scratches from the surface of specimen. Finally, Etching is the operation of revealing micro-structural features (grain boundaries, phases, precipitates and other micro-structure constituents) of the polished specimen through selective chemical attack on the surface. A common misconception is that a polished surface has a mirror bright finish, however most mirror bright finishes are actually buffed.

Polishing is often used to enhance the looks of an item, prevent contamination of instruments, remove oxidation, create a reflective surface, or prevent corrosion. In metallography and metallurgy, polishing is used to create a flat, defect-free surface for examination of a metal’s microstructure under a microscope. Silicon-based polishing pads or a diamond solution can be used in the polishing process. Polishing stainless steel can also increase the sanitary benefits of stainless steel. In the Bar Polishing Machine polishing wheel spins at high speed in a plane perpendicular to the surface to be machined, which ensures the flatness of the surface machined and also the parallelism of the opposite surfaces of job being machined. The depth of cut is governed by the sliding motion of cutter carrier in the downward direction where as the wobbling action achieved by the combined rotary and eccentric motion of the work table ensures that even machining takes place all over the surface. To ensure that the complete surface is machined the table slide is provided.

automatic bar polishing machine mechanical project
automatic bar polishing machine mechanical project

Advantages
1. Flatness guaranteed, Surface machined is necessarily flat.
2. No Tool marks on the surface machined.
3. Even polishing on surface.
4. Less Time consuming, suitable for mass production.
5. Dimensional accuracies maintained.
6. Surface finish guaranteed.
7. Parallelism of surfaces machined is maintained.

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DESIGN AND FABRICATION OF BAR POLISHING MACHINE

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