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Study on Burr Formation Mechanism When Turning Nickel-Based Alloys.

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Title: Study on Burr Formation Mechanism When Turning Nickel-Based Alloys.
Authors: Khidhir, Basim A.1, Mohamed, Bashir2
Source: Experimental Techniques. Sep/Oct2013, Vol. 37 Issue 5, p14-20. 7p.
Subjects: Numerical control of machine tools, Machine tools -- Automatic control, Burr, Chip, Nickel, Alloys, Shear (Mechanics)
Abstract: The aim of this paper was to introduce the study on burr formation mechanism of nickel-based Hastelloy C-276 in the turning process. The process is monitored using a high-speed camera mounted on a computer numerical control (CNC) turning machine. The captured photographs show that the burr starts appearing on the edge of an uncut surface when the engagement with the chip-workpiece contact area is complete and increases accordingly during the process of hitting the cutting edge and causing chipping wear. The study shows that the initializing of chip burr formation can be divided into two stages: creating and mounting up. Creating of burr formation is characterized by the 'reaction of shear formation' of the cutting force on the edge of chip for an unmachined surface, while mounting up increasing in size and forcing the chip to change its direction shoots up the rake face. This edge of the burr will separate and re-attach with the burr edge again during mounting up, thus creating a chain web shape on the edge of the uncut surface and causing edge chipping. The results show that the approach angle has a significant effect on burr formation. [ABSTRACT FROM AUTHOR]
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Description
Abstract:The aim of this paper was to introduce the study on burr formation mechanism of nickel-based Hastelloy C-276 in the turning process. The process is monitored using a high-speed camera mounted on a computer numerical control (CNC) turning machine. The captured photographs show that the burr starts appearing on the edge of an uncut surface when the engagement with the chip-workpiece contact area is complete and increases accordingly during the process of hitting the cutting edge and causing chipping wear. The study shows that the initializing of chip burr formation can be divided into two stages: creating and mounting up. Creating of burr formation is characterized by the 'reaction of shear formation' of the cutting force on the edge of chip for an unmachined surface, while mounting up increasing in size and forcing the chip to change its direction shoots up the rake face. This edge of the burr will separate and re-attach with the burr edge again during mounting up, thus creating a chain web shape on the edge of the uncut surface and causing edge chipping. The results show that the approach angle has a significant effect on burr formation. [ABSTRACT FROM AUTHOR]
ISSN:07328818
DOI:10.1111/j.1747-1567.2011.00725.x