Analysis of Hole Quality for Pre Tempered Float Glass While Using Rotary Ultrasonic Machining

Abstract

In today s industrialization era, the innovation in the field of hard and brittle material such as float glass is still under investigation, because of its continuous demand as an operational application. It s fascinating features such as high thermal stability, strength, toughness, and high optical transmittance makes it a high-performance material. The major application of such materials is listed as optical lenses, automotive glass, thermal collector, solar concentrator, sensors, and solar panel etc. These materials are known as difficult to machine material, because of their brittleness. Analysis of a float glass during machining or drilling process is considered as a brainstorming research area. The drilled hole quality is characterized by the amount of chipping generated near hole edge corners on both sides of the hole as well as the surface roughness of the hole. Hence, the research endeavor of the present work is to pay attention and introduces their strategies to minimize the unwanted chipping near the entrance and exit periphery of the hole by deploying trending rotary ultrasonic machining technique. In the entire study, the hole entrance chipping is measured as average radial chip distance (RCD), hole exit chipping is quantified as the maximum chip radial distance (CRD) and the maximum chip thickness (tc) in horizontal and vertical direction, respectively. In the first case study, multi-shaped tools are used to create blind holes by rotary ultrasonic machining and conventional drilling. The intention is to select the best tool among all to get the negligible RCD along with least tool wear. It is noticed that according to the tool shapes, each tool has paying should be own path of drilling and effective contact area which influences the chip formation and the quality of the hole. The multi tool study for blind holes shows that rotary ultrasonic drilling process attained smallest measurement of radial chip distance as compare to CD for all types of tools.