Abstract
The paper presents PCBN-Ciborit cutting tools life and wear test results. The effects of the machining regime when turning amorphous-crystalline Fe80B20 and Fe79Cr16B5 coating systems applied to conventional workpiece materials were assessed. It has been shown that the observed tool wear mechanisms are complex in their character and are dominated by abrasive-mechanical, adhesive and chemical effects in the cutting zone. Under changing turning conditions tool life is affected by the structural-phase composition and by the non-homogeneous structure of the coating. Specifically, when turning gas-flame coatings deposited with a Fe80B20 electrode and electro-arc coatings with a Fe79Cr16B5 electrode the lowest wear and the highest tool life was achieved at cutting speeds of v = 1.1 to 1.2 m/s and a back rake angle of γ = –10o. It has been demonstrated that a change of the back rake angle from γ = 0 to –10o does not have a great effect on tool life contrary to the case with γ = -20o.
Highlights
Materials possessing amorphous and amorphous-crystalline structures have been used to manufacture workpieces with improved physical-chemical and mechanical properties
The paper presents tests results for PCBN Ciborit tool wear and the determination of its tool life when turning coatings that possess a heterogeneous amorphous-crystalline structure and that are formed by various technologies
On the basis of what has been said, the mechanism of PCBN cutting edge wear in turning of amorphous-crystalline coatings is complex in its characteristics and is influenced by abrasive, mechanical, adhesive and chemical interactions in the cutting zone
Summary
Materials possessing amorphous and amorphous-crystalline structures have been used to manufacture workpieces with improved physical-chemical and mechanical properties. Extraordinary enhancements in performance can be gained when, for surface layer reinforcement, amorphous alloys in the form of coatings are deposited on workpieces made of conventional design materials. A relatively new trend is the manufacture of Fe-B, Fe-Si-B, Fe-Cr-B alloy coatings, which form amorphous structures. These coatings are relatively inexpensive and possess a uniform complex of properties, the quality of the machined surface frequently lacks desirable characteristics. The first deals with the different types of amorphous coatings and their application technologies, while the second deals with the tools for their machining
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Strojniški vestnik – Journal of Mechanical Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
