Abstract
Heat produced at the tool-chip interface during high speed milling operations have been known as a significant factor that affect to tool life and workpiece geometry or properties. This paper aims to investigate cutting temperature behaviours of AISI H13 (48 HRC) under high speed machining circumstances during pocketing. The experiments were conducted on CNC vertical machining centre by using PVD coated carbide insert. Milling processes were done at cutting speeds 150, 200 and 250 m/min and feed rate were 0.05, 0.1 and 0.15 mm/tooth. Depths of cut applied were 0.1, 0.15 and 0.2 mm. Tool path method applied in this experiment was contour in. Results presented in this paper indicate that by increasing cutting speed the cutting temperature is lower than low cutting speed. However, by decreasing feed rate leads to cutting temperature low. Cutting temperature phenomena at the corner of pocket milling were also investigated. The phenomena showed that cutting temperature tends to decrease a moment when cutter comes to the corner of pocket and turning point of tool path and increase extremely a moment before leaving the corner and turning point.
Highlights
End milling is a basic machining operation in the manufacture of mechanical components to generate a flat surface and/or a three-dimensional free-formed surface; it requires high geometric accuracy and high productivity
Most of the power consumed for plastic deformation is converted into heat, and high temperatures are generated
3.1 Cutting Temperature of AISI H13 The cutting temperature of this experiment was measured by ThermoPro (Model TP8) Infrared (IR) thermal imaging camera
Summary
End milling is a basic machining operation in the manufacture of mechanical components to generate a flat surface and/or a three-dimensional free-formed surface; it requires high geometric accuracy and high productivity. High temperature is claimed to cause several types of thermal damage to the cutting tool and workpiece, such as rapid tool wear and thermal expansion of the workpiece [1]. Since end milling is an intermittent machining process, the cutting tool is depending on cyclical heating and cooling, and temperature variation in the cutting tool is more complicated than in turning. The achievement of these objectives by high speed end milling places it at the front line of rapid tooling and manufacturing technologies
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