14-10-2014, 02:53 PM
Abstracts: Abrasive Jet Machining (AJM) is the process of material removal from a work piece by the application of a high speed stream of abrasive particles suspended in a gas medium through a nozzle. The material removal process is mainly caused by brittle fracture by impingement and then by erosion. The AJM is chiefly used to cut shapes, drill holes and de-burr in hard and brittle materials like glass, ceramics etc. In this project, a model of the Abrasive Jet Machine has been made. Enough care was taken to efficiently use the available material and space. The machine was fabricated in the workshop of our institute with conventional machine tools like Arc Welding Machine, Hand Drill, Grinding Machine using commonly available materials like Mild Steel Sheet and Rod, Aluminium Sheet, Glue, Polythene Sheet, Glass Fibre which are commonly available in the local market. Less fabricated components have been used because of the lack of accuracy in fabricated components would lead to a reduced performance of the machine. The machine is automated to have 3 axes travel using microcontroller and driver arrangement along with stepper motor. The different functional components of AJM are the Machining Chamber, Work Holding Device, Abrasive Drainage System, Compressor, Air Filter and Regulator, Abrasive Nozzle, and Mixing Chamber with Cam Motor arrangement. The different components are selected after appropriate design calculations to have optimum model of an Air Abrasive Jet Machine. Using Abrasive Air Jet Machine Model the cutting operation has been performed on a Glass having depth of 5mm under the suitable pressure of 100-120 bar with use of the white sand particles as an abrasive particle for 90 to 100 sec duration to test the setup.