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Research Papers

Investigation on Heat Transfer Performance of Heat Pipe Grinding Wheel in Dry Grinding

[+] Author and Article Information
Qingshan He

College of Mechanical and
Electrical Engineering,
Henan University of Technology,
ZhengZhou 450007, China

Yucan Fu

College of Mechanical and
Electrical Engineering,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China
e-mail: yucanfu@nuaa.edu.cn

Jiajia Chen, Wei Zhang

College of Mechanical and
Electrical Engineering,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China

1Corresponding author.

Manuscript received October 27, 2015; final manuscript received April 9, 2016; published online June 23, 2016. Assoc. Editor: Radu Pavel.

J. Manuf. Sci. Eng 138(11), 111009 (Jun 23, 2016) (8 pages) Paper No: MANU-15-1539; doi: 10.1115/1.4033445 History: Received October 27, 2015; Revised April 09, 2016

The use of fluid in grinding enhances heat exchange at the contact zone and reduces grinding temperature. However, the massive use of fluid can cause negative influences on environment and machining cost. In this paper, a novel method of reducing grinding temperature based on heat pipe technology is proposed. One new heat pipe grinding wheel and its heat transfer principle are briefly introduced. A heat transfer mathematical model is established to calculate equivalent thermal conductivity of heat pipe grinding wheel. Compared with the wheel without heat pipe, heat transfer effect of heat pipe grinding wheel is presented, and the influences of heat flux input, cooling condition, wheel speed, and liquid film thickness on heat transfer performance are investigated. Furthermore, dry grinding experiments with two different wheels are conducted to verify the cooling effectiveness on grinding temperature. The results show that thermal conductivity of the wheel with heat pipe can be greatly improved compared to the one without heat pipe; heat transfer performance of heat pipe grinding wheel can change with different grinding conditions; meanwhile, grinding temperatures can be significantly decreased by 50% in dry grinding compared with the wheel without heat pipe.

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Figures

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Fig. 1

(a) Heat pipe grinding wheel structure: 1—cover plate, 2—wheel component, 3—seal joint, 4—plug, and 5—rubber ring, and (b) manufactured heat pipe grinding wheel

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Fig. 2

Heat transfer principle of heat pipe grinding wheel

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Fig. 3

Experimental system (a): 1—adjustable spot cooler system, 2—supporting frame, 3—test wheel, 4—brush, 5—induction coil, 6—collector ring, 7—filter amplifier, and 8—data acquisition card, and temperature measuring points of test wheel (b)

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Fig. 4

Temperature calibration curve of the thermocouple

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Fig. 5

Thermal signal of Po,e measured in stationary state

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Fig. 6

Comparison between results of test wheel with heat pipe and the one without heat pipe on measured thermal signals of each thermocouple: ((a) and (d)) Po,e, ((b) and (e)) Pi,e, and ((c) and (f)) Pi,c

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Fig. 7

Temperatures of Po,e, Pi,e, and Pi,c under different heat flux inputs and cooling conditions

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Fig. 8

Temperatures of Po,e, Pi,e, and Pi,c under different wheel speeds

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Fig. 9

Temperatures of Po,e, Pi,e, and Pi,c under different liquid film thicknesses at the evaporator

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Fig. 10

Thermocouple configuration for surface grinding

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Fig. 11

Measured signals in dry grinding with two different wheels: (a) grinding wheel without heat pipe and (b) heat pipe grinding wheel

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Fig. 12

Effects of two different wheels on grinding temperatures in dry grinding

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