Plastic Forming Processes Through Rotating Conical Dies

[+] Author and Article Information
D. Durban, G. Davidi, D. Lior

Faculty of Aerospace Engineering, Technion, Haifa 32000, Israel

J. Appl. Mech 68(6), 894-902 (Feb 20, 2001) (9 pages) doi:10.1115/1.1382597 History: Received October 13, 2000; Revised February 20, 2001
Copyright © 2001 by ASME
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Grahic Jump Location
Drawing or extrusion of tubes through rotating conical dies. The working zone is bounded by the radii rin≤r≤rout and wall angles α1≤θ≤α2.
Grahic Jump Location
Effect of walls rotation on reducing working loads. Curves are for m1=m2=0.05 and α1=7deg. Here Mmax=8.62⋅10−4. Values of cone angles ratio α21 are indicated over the curves. In the absence of rotation z=0 and δ=δ0. The theoretical limit for α21→1 is given by 1−z2.
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Notation for composite multilayered tube drawing or extrusion. The composite consists of n layers (i=1,2,[[ellipsis]],n) with the ith layer bounded by the cones αi−1≤θ≤αi. All layers have common entry/exit radii (r=rin,rout) and wall angles are α0n.
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Variation of M̄max and 1+δ̄(M̄=M̄max) with wall data. Optimal design where δ̄=0 corresponds to the line of intersection of the M̄max pyramid faces where m0α02y1=mnαn2yn. Results are for composite multilayered tubes.
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Drawing stress T for mild steel (MS) tubes with fixed inner wall angle of α0=7deg≈0.12 rad. Upper curve is for stationary dies. Lower curves are for rotating dies at M̄max. Also shown is the influence of cladding of external surface with brass (Br) or with copper (Cu). Friction factors in all cases are m=0.06 on both walls.




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