Design of Ball Screw Mechanism for Retro Fit of External Grinding Machine

Abstract

To convert the existing grinding machine into a good working machine, a ball screw mechanism is designed and incorporated in the existing grinding machine by retrofitting process. Grinding machine removes material from the work piece by abrasion, which can generate substantial amount of heat. Therefore a coolant System is incorporated to cool the work piece, so that it does not overheat and go out of its tolerance. Grinding practice is a large and diverse area of manufacturing and tool making. It can also rough out large volume of metal quite rapidly. It is usually better suited to the machining of hard materials. Cylindrical grinding is also called center type grinding. It is used in the removing the cylindrical surface and shoulders of the work piece. The five type of cylindrical grinding are outside diameter (OD) grinding. Inside diameter (ID) grinding, plunge grinding, creep feed grinding and center less grinding.It is used in the industries for grinding the nozzle body. The grinding machine can be changed to automatic machine according to one of the latest technologies called PLC's controller. The manually operated grinding machine has some of the inaccuracies and disadvantages compared to new modern CNC grinding machines.Based on the case study of both manual and CNC grinding machine, the manual machine is converted into automatic machine for the better accuracy and efficiency. The main replacement of the machine parts are hydraulic cylinder and stepper motor by ball screw mechanisms and servo motor.