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Effect of drilling parameters on drilling temperature and force of ultra-high strength steel

Aiming at 300M hard-to-machine material, the effects of different drilling parameters (spindle speed N, feed F, bit diameter D) on drilling temperature, torque and axial force were analyzed and studied by orthogonal test method. The prediction models of drilling temperature, torque and drilling axial force are constructed. The results show that the cutting temperature and stress are mainly distributed on the cross edge of the bit in the initial stage of 300 m steel drilling. With the continuous drilling process of 300M hard-to-machine materials, the cutting temperature and stress generated gradually transfer to the main cutting edge of the bit and extend along the main cutting edge. With the increase of bit diameter, the cutting axial force, torque and cutting temperature decrease, but the cutting axial force, torque and cutting temperature decrease. With the increase of spindle speed and feed, the cutting temperature is increasing. According to the results of orthogonal experiment, the cutting axial force is established by least square method. The predictive models of force, torque and cutting temperature are validated by the experimental model coefficients and model coefficients. The results show that feed f has the greatest influence on cutting axial force, torque and cutting temperature.
PAPER REVISED: 2019-01-20
PAPER ACCEPTED: 2019-01-30
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