Li, Qiang
(2003)
Characterization of Failure Mechanisms in Cross Wedge Rolling.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Cross wedge rolling (CWR) is a metal processing technology in which a heated cylindrical billet is plastically deformed into an axisymmetric part by the action of wedge shape dies moving tangentially relative to the workpiece. The CWR process offers several innovative and unique features over traditional machining operations. Despite these advantages, the CWR process has not been widely accepted throughout the manufacturing community, particularly in the U.S. This can mainly be attributed to complexities involved in CWR tool design. The design of CWR tooling is difficult because of the potential failure mechanisms that can be encountered during the CWR process. In this dissertation, extensive experimental investigation and numerical simulation have been performed to characterize the major failure mechanisms in cross wedge rolling. Based on the combined experimental and numerical analysis, criteria for predicting improperly formed workpiece cross section due to excess interfacial slip and internal defects due to the formation of internal voids have been determined. Based on these criteria, it is believed that the design of CWR tooling can be simplified, making CWR a more viable manufacturing process in the US.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
| Title | Member | Email Address | Pitt Username | ORCID |
|---|
| Committee Chair | Lovell, Michael | mlovell@pitt.edu | MLOVELL | | | Committee Member | Bidanda, Bopaya | | | | | Committee Member | Onipede, Dipo | | | | | Committee Member | Smolinski, Patrick | | | | | Committee Member | Slaughter, William | | | |
|
| Date: |
8 May 2003 |
| Date Type: |
Completion |
| Defense Date: |
11 March 2003 |
| Approval Date: |
8 May 2003 |
| Submission Date: |
19 March 2003 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Friction model; Interfacial Slip; Internal Failure |
| Other ID: |
http://etd.library.pitt.edu:80/ETD/available/etd-03192003-145647/, etd-03192003-145647 |
| Date Deposited: |
10 Nov 2011 19:32 |
| Last Modified: |
15 Nov 2016 13:37 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/6528 |
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