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Indexed by:期刊论文

Date of Publication:2018-05-01

Journal:JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:255

Page Number:340-346

ISSN No.:0924-0136

Key Words:Laser cutting; Al2O3 ceramic; Removal particles; Morphology investigation; Vapor-to-melt ratio

Abstract:An investigation of particle morphology based on vapor-to-melt ratio is carried out to reflect the relationship between the forms of material removal and effects of cutting process. The influences of vapor-to-melt ratio on morphology of removal particles (average diameter, diameter distribution, sphericity, spheroidization rate and density distribution) is investigated by the experimental observation and analysis. It is shown that, a steady processing state with maximum average diameter, concentrated distribution, better sphericity, lager spheroidization rate and higher hollow proportion of removal particles is obtained at a relatively large value of vapor to-melt ratio. However, at a too high value of vapor-to-melt ratio, a small quantity of material breaks and strips in a substrate form by the hot tearing effect of material. These irregular residues are mixed in the total removal collection, thereby reducing the average sphericity of the overall removal. When the particle diameter is greater than 100 mu m, a complete cavity is formed close to the center, and the diameter is about 1/2 that of the whole particle.