Analysis of cutting torques during tapping with internal chip placement using ionized air as a cool-ing and lubricating fluid
Authors: Litvinenko A.V., Zubkov N.N. | Published: 02.04.2015 |
Published in issue: #3(660)/2015 | |
Category: Technology and Process Machines | |
Keywords: thread cutting, tap, ionized air, cooling, cutting torque, reversal torque |
Increasing the reliability of thread cutting by taps without using liquid lubricants is of great importance for engineering industries. The results of experimental study of cutting and reversal torques during tapping metric threads with taps, having internal chip placement using ionized air as a cooling and lubricating fluid are presented, discussed, and compared with thread cutting by conventional taps. Tapping M12´1.75 internal metric threads in lowalloy steel, aluminum alloy, gray cast iron, and pure copper is studied. It has been found that the cutting torque for taps with internal chip placement decreases almost by one half and their reversal torque decreases several times as compared to conventional taps. The prospects of using ionized air as a cooling and lubricating fluid for taps with internal chip placement are discussed. The most significant reduction of the reversal torque due to ionized air has been observed when processing aluminum alloy and copper.
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