Experimental investigation of the infeed method and machining parameters on the tool wear during thread milling

Document Type : Research Article

Authors

Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

Abstract

Thread has been considered a widely used technology in industries. Thread milling is suggested as an alternative process of tapping. Thread milling includes a small tool that follows a helical path. This process includes significant advantages such as threading holes with different diameters using a specific tool.  One of the important issues in machining is tool wear. In thread milling, effective parameters on the tool wear include tool angles and geometry, infeed method, feed, and tool rotational speed. Tool wear and infeed method in thread milling have not been addressed in recent investigations. Hence, this research studies the infeed methods and effective parameters of the machining process on the tool wear during thread milling. Experimental results showed that increasing feed from 0.2 to 0.4 mm/rev led to 30% to 40% larger values of flank wear. Also, the variation of rotational speed from 500 to 900 rpm increased the flank wear about 50% to 60%. Two cases of incremental and modified flank infeed were employed. Considering different rotational speeds, the incremental infeed method increased the tool life about 100%, while the modified flank infeed method achieved 300% higher tool life. During the incremental infeed method, the tool-workpiece engagement area was distributed between two curring edges and reduced adhesion and diffusion mechanisms of tool wear, which finally resulted in significant tool life.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 2 (Special Issue)
May 2021
Pages 1345-1356

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