Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Investigation into temperature distribution during milling process of aerospace industry alloys

nr katalogowy: 79745

Since the goal of any material removal processes is the component that consistently meets specifications. To improve the quality of the finished workpiece it is essential to know temperature distribution in the cutting zone. Furthermore, studies have shown that in material removal processes, phenomena that can degrade workpiece quality are strictly connected with temperature history of the workpiece [1]. Milling operation is one of the most popular removal process employed in aerospace and automotive industries. In many cases parts are made of titanium and magnesium alloys to reduce mass and ensure satisfactory mechanical and heat resistant properties [2, 3]. However, cutting these types of materials causes many obstacles connected with bad machinability for titanium alloys and possibility of chips ignition during cutting of magnesium alloys [4]. For these reasons knowledge about temperature distribution in cutting zone is essential for safety reasons concerning magnesium alloys and efficiency of cutting operations in case of titanium alloys [5]. However, the measurement of cutting temperature in milling operations presents unique technical challenges, not the least of which are tracking of a rotating flute and the motion of multiple moving axes [6÷8]. Titanium alloys are classified as materials difficult to machine [9]. Difficulties in processing titanium and its alloys are mainly caused by the following characteristics: high chemical activity, low thermal conductivity, a tendency to chip sticking to the tools and material’s tendency to build ribbon chips. WORKPIECE MATERIAL AND MACHINING ARRANGEMENT During investigation two different types of work piece material have been selected. First one was a titanium alloy (GRADE 19 - ASTM B348) and the second one magnesium alloy (AZ91HP). Investigations were carried out by means of experimental stand presented in Figure 1. The cutting was carried out on a CNC vertical machinin[...]

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2013-4

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