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A cylindrical work-piece is subjected to a cold upset forging operation. The starting piece is 75...

A cylindrical work-piece is subjected to a cold upset forging operation. The starting piece is 75 mm in height and 50 mm in diameter. It is reduced in the operation to a final height of 36 mm. The work material has a flow curve defined by K = 350 MPa and n = 0.17. Assume a coefficient of friction of 0.1. Determine the forging force at (a) the intermediate height of 62 mm, (b) the intermediate height of 49 mm, and (c) the end of the stroke.
 
Plot (sketch) the load-stroke curve for this process, i.e. plot the forging force as a function of height reduction (ho - hi).
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Given: Initial height of the work piece, H 75 mm 0.075 m Initial diameter of the work piece, D 50 mm 0.05 m Final height of the work piece, h- 36 mm 0.036 nm Flow stress of the material, K 350 MPa Flow coefficient, n 0.17 Friction coefficient, μ 0.1 Solution: Find the volume of the work piece 4 46875 π mm After the load is applied on the work piece, it gets starts yielding Let us assume the minimum strain in the material at this point to be 0.002. When the yielding just starts, the diameter is almost same as 50 mm and height is slightly less than 75 mm Find the flow stress 0.17 yKe350 (0.002) 2.68 MPa Find the forging shape factor 0,4 μ D 0.4x 0.1x50 75 -1.027

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