Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22242
Title: Experimental studies of plastic deformation behaviors in microheading process
Authors: Chan, WL
Fu, MW 
Keywords: Microforming
Microheading
Plastic deformation
Size effect
Issue Date: 2012
Publisher: Elsevier
Source: Journal of materials processing technology, 2012, v. 212, no. 7, p. 1501-1512 How to cite?
Journal: Journal of materials processing technology 
Abstract: The demand on microparts is increasing significantly due to the global trend of product miniaturization. Microforming provides a promising approach to fabricating microparts with good mechanical properties at low cost and high productivity. However, when the part dimension is scaled down to micro-level, the size effect occurs such that the deformation behaviors are different from those in macroscale. The investigations on size effect and the physics behind the phenomena observed are thus needed. In this research, the size effect on material deformation behavior is investigated based on the two heading cases, viz., central heading and end heading of the rods of the cold-drawn and annealed pure copper. It is found that the grain flow of the cold-drawn material is different from that of the annealed material and the coarse-grained material undergoes nonuniform deformation when the part size is in microscale. These phenomena can be explained by the strong texture in the cold-drawn material and the strain incompatibility among different grains in the coarse-grained material. In addition, the tooling surface texture generated in grinding process makes the friction different in different flow directions, resulting in the variation of formed profiles in both macro- and microparts. The surface roughening effect on the formed part becomes significant in microheading process. It has a close relationship with the grain size and crystallographic texture of the forming material. Furthermore, the punch-die and workpiece-tooling interfaces have a certain effect on deformation pressure. This leads to the scattering effect and the difference of the deformation pressure-stroke curves between the macroheading and microheading. The reported experimental results and the articulated findings provide a basis for understanding of material size effect in microheading process.
URI: http://hdl.handle.net/10397/22242
ISSN: 0924-0136
EISSN: 1873-4774
DOI: 10.1016/j.jmatprotec.2012.02.013
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

12
Last Week
0
Last month
0
Citations as of Nov 9, 2017

WEB OF SCIENCETM
Citations

16
Last Week
0
Last month
1
Citations as of Nov 16, 2017

Page view(s)

30
Last Week
1
Last month
Checked on Nov 19, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.