AERONAUTICAL AND MECHANICAL ENGINEERING Abrasive Flow Machining : Major Research Areas & Analysis
Abrasive flow machining also known as abrasive flow deburring or extrude honing, is an interior surfac e finishing process characterized by flowing an abras ive-laden fluid through a work piece. This fluid is typically very viscous, having the consistency of p utty, or dough. In this paper, the main purpose of the process is to investigate the surface finishing of die steel with the use of abrasive flow machining. Grinding medium is pressed along the contours at a defined p r ssure and temperature. Depending on the respectiv e machining task, different specifications of media a re used. The surface finishing is better with use o f abrasive flow machining process as compared to other flow ma chining processes.
Experimental investigation into cutting forces and active grain density during abrasive flow machining
Abstract It is important to know cutting force components and active grain density during abrasive flow machining (AFM) as this information could be used to evaluate the mechanism involved in AFM. The results show that cutting force components and active grain density govern the surface roughness produced during AFM process. In this paper, an attempt has been made to study the influence of these two parameters, namely cutting force and active grain density, on the surface roughness. This study will help in developing a more realistic theoretical model. The present paper highlights a suitable two-component disc dynamometer for measuring axial and radial force components during AFM. The influence of three controllable variables (extrusion pressure, abrasive concentration and grain size) on the responses (material removal, reduction in surface roughness (Ra value), cutting forces and active grain density) are studied. The preliminary experiments are conducted to select the ranges of variables by using single-factor experimental technique. Five levels for abrasive concentration and six levels for extrusion pressure and abrasive grain size were used. A statistical 23 full factorial experimental technique is used to find out the main effect, interaction effect and contribution of each variable to the machined workpiece surface roughness. The machined surface textures are studied using a scanning electron microscope.
Reduction of patient exposure during dental radiography.
We investigated the effect of using additional accessories with a conventional X-ray machine to reduce patient exposure during full-mouth dental radiography. LiF extruded-rod thermoluminescent dosimeters were placed in 23 anatomical sities of a Randophantom and the phantom was exposed to a Turkish dental X-ray machine operated at 60 kV, 10 mA for 0.5 sec periods. Maximum reductions were observed at the eyes (80%), in the thyroid (70.6%). under the collar bone (59.9% average) and the gonads