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Engineering · Mechanical Engineering
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Question A.2 (a) With the aid of diagrams explain the two main types of extrusion. 6 marks] (b) With the aid of a diagram, indicate the process variables in drawing and discuss the factors that are required for a metal to successfully be drawn into wire. [9 marks] (c) Annealed 3 mm diameter stainless steel wire is drawn through a die at a draw speed of 2 m/s to form a wire of cross-sectional area 5 mm2. The dies have an included angle of 12° and a commercial oil-based lubricant is used. Calculate the draw force Assuming steady-state conditions, the draw stress Oastl Can be calculated by using: where :088 + 0.12 is the mean flow stress DATA: The friction coefficient between workpiece and die, H 0.04 For stainless steel, K 1300 MPa and n-0.3 [10 marks) [25 marks in total]
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