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Indexed by:期刊论文

Date of Publication:2018-02-01

Journal:INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:94

Issue:5-8

Page Number:2077-2088

ISSN No.:0268-3768

Key Words:Wear behavior; Thermal-mechanical effect; Ti-6Al-4V alloy; Cutting edge micro-unit; Cryogenic cooling milling

Abstract:In order to make clear the effect of heat-force on tool wear for milling Ti-6Al-4V alloy in cryogenic cooling. The thermal-mechanical calculation models were established. Compared with conventional cutting, the thermal-mechanical effect rules and thermal action characteristics were analyzed in cryogenic cooling. As well as the cryogenic cooling milling method was executed for a series of processing experiments. The influence of heat-force on chip morphology and surface quality are researched. Meanwhile, the regular tool wear and mechanism were discussed. The results show that the measurement data and change tendency of milling forces are similar to the calculated data; the model is basically effective. Besides, when the cutting micro-unit is kept away from the tool nose, the tool-workpiece contact temperature and cutting force are all slow change compared with conventional cutting in cryogenic. Because of the tool-workpiece interaction squeezing action, the plastic-brittle deformation is obtained under the effect of liquid nitrogen cold quenching. Furthermore, the built-up edge in tool nose is not formed in cryogenic with unobvious thermal softening effect, so the friction effect of hard material is reduced. As a result, it improves obviously the workpiece machining quality and tool life, even as the stable wear range of tool has been transformed from 0.075-0.2 to 0.05-0.26 mm. Therefore, the thermal-mechanical effect influences tool wear, and controlling heat-force is evident, effective for improving tool life through cryogenic cooling.