Research Papers

Ball Burnishing Under High Velocities Using a New Rolling Tool Concept

[+] Author and Article Information
Lars Hiegemann

Institute of Forming Technology
and Lightweight Construction,
TU Dortmund University,
Baroper Street 303,
Dortmund 44227, Germany
e-mail: Lars.Hiegemann@iul.tu-dortmund.de

A. Erman Tekkaya

Institute of Forming Technology
and Lightweight Construction,
TU Dortmund University,
Baroper Street 303,
Dortmund 44227, Germany
e-mail: Erman.Tekkaya@iul.tu-dortmund.de

1Corresponding author.

Manuscript received July 19, 2017; final manuscript received July 24, 2017; published online February 12, 2018. Editor: Y. Lawrence Yao.

J. Manuf. Sci. Eng 140(4), 041008 (Feb 12, 2018) (6 pages) Paper No: MANU-17-1454; doi: 10.1115/1.4037431 History: Received July 19, 2017; Revised July 24, 2017

Ball burnishing is a process used to smooth rough surfaces. For not rotational symmetric parts, the process is typically conducted on milling machines. Since it is an incremental process, it is relatively time consuming. Therefore, a rolling tool is developed, which superposes the rotation of the milling spindle with the feed of the machine to increase the rolling velocity. In order to achieve constant rolling forces, hydrostatic ball-burnishing tools are used. Within this work, the influence of this tool concept on the processing time as well as on the leveling of surface irregularities is investigated. This is achieved by a comparison with a conventional ball-burnishing process. Finally, the rotating tool is used to investigate the influence of high rolling speeds on the leveling of the surface. All experiments were carried out with thermally coated specimens. A model for calculating the strain rates at the roughness peaks during ball burnishing is derived. For the experiments carried out with the rotating rolling tool, rolling velocities of 50,000 mm/min were realized. Calculations with the developed model showed that this results in local strain rates at the roughness peaks of up to 1384 s−1. In addition, the flow stresses at the roughness peaks were calculated. Compared with quasi-static experiments, the flow stress drops to less than the half under high velocities. This results in a better leveling of the surface for rolling velocities between 10,000 mm/min and 25,000 mm/min. A further rise of the rolling speed increases the flow stress again and thereby reduces the possible leveling.

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Fig. 6

Experimental setup with rotating ball-burnishing tool

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Fig. 5

Schematic illustration of the rotating ball-burnishing tool

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Fig. 4

Principle of motion superposition

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Fig. 3

Roughness peak before and after ball burnishing [14]

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Fig. 2

(a) Thermally coated and ball-burnished deep drawing die and (b) deep drawn part

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Fig. 1

Principle of ball burnishing [1]

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Fig. 7

Rolling path of (a) conventional tool and (b) rotating tool

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Fig. 8

Specimens with (a) translational rolling track and (b) spiral rolling track

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Fig. 11

Percentage reductions of roughness in dependence of rolling velocity

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Fig. 9

Microscopic measurement of width of rolling track [14]

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Fig. 12

Flow stress at a roughness peak in dependence of the strain rate for a WC12Co coating (deposited by HVOF)

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Fig. 10

Average percentage reductions of roughness for rotatory and conventional tool




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