Heat energy generated during machining has been found to have a greater influence on determining the machinability of the materials.In this work,magnesium-based silicon carbide composite,which has been identified as a...Heat energy generated during machining has been found to have a greater influence on determining the machinability of the materials.In this work,magnesium-based silicon carbide composite,which has been identified as a suitable lightweight application material,is prepared with the weight ratio of 90:10 by a stir casting process.Conventionally available HSS drill tools with different diameters of 4,6 and 8 mm are used to perform the drilling operations with governing parameters of spindle speed,feed rate and constant depth of cut.Thermal image camera of the FLIR E60 series is used to measure the temperature variation in the cutting zone at different operating conditions.The influences of machining temperature on chip morphology,tool wear and surface profile of the machined samples are investigated.Spindle speed has been found to have a significant effect on machining temperature.When spindle speed increases,the diameter of drill tool increases the tool wear and surface profile,respectively.Both abrasion and adhesive type of wears are observed in the drill tool.Further,change from abrasion to adhesive wear is noticed with the increase of the diameter of the drill tool.Surface plots are drawn with respect to the interaction of governing parameters along with the working temperatures obtained under different machining conditions.展开更多
The influences of adding steel fibres of different lengths up to 3 volume percentages, on the rheological behaviour of an alumina-magnesia-extruded graphite pellet containing castables have been studied using a rheome...The influences of adding steel fibres of different lengths up to 3 volume percentages, on the rheological behaviour of an alumina-magnesia-extruded graphite pellet containing castables have been studied using a rheometer. Free-flow measurements have shown that the flow is severely affected by increasing the length of steel fibres. The calculated values of rheological constants indicate that 19 mm and 25 mm fibre up to 2 volume percentage is permitted while one volume percentage of 50 mm fibres severely degrades the rheology of the castable.展开更多
文摘Heat energy generated during machining has been found to have a greater influence on determining the machinability of the materials.In this work,magnesium-based silicon carbide composite,which has been identified as a suitable lightweight application material,is prepared with the weight ratio of 90:10 by a stir casting process.Conventionally available HSS drill tools with different diameters of 4,6 and 8 mm are used to perform the drilling operations with governing parameters of spindle speed,feed rate and constant depth of cut.Thermal image camera of the FLIR E60 series is used to measure the temperature variation in the cutting zone at different operating conditions.The influences of machining temperature on chip morphology,tool wear and surface profile of the machined samples are investigated.Spindle speed has been found to have a significant effect on machining temperature.When spindle speed increases,the diameter of drill tool increases the tool wear and surface profile,respectively.Both abrasion and adhesive type of wears are observed in the drill tool.Further,change from abrasion to adhesive wear is noticed with the increase of the diameter of the drill tool.Surface plots are drawn with respect to the interaction of governing parameters along with the working temperatures obtained under different machining conditions.
文摘The influences of adding steel fibres of different lengths up to 3 volume percentages, on the rheological behaviour of an alumina-magnesia-extruded graphite pellet containing castables have been studied using a rheometer. Free-flow measurements have shown that the flow is severely affected by increasing the length of steel fibres. The calculated values of rheological constants indicate that 19 mm and 25 mm fibre up to 2 volume percentage is permitted while one volume percentage of 50 mm fibres severely degrades the rheology of the castable.
