Abstract
Cut-off tools equipped with carbide inserts are commonly used in turning operations. Due to the very heavy conditions in which such blades work, they fail, as a rule, not as a result of their operation, but due to the breakage of carbide inserts. This study investigates the causes of such failures and methods to prevent such phenomena. A thorough analysis of the current state and research methods of stress state in cutting tools, including turning cutters, was carried out. Methods of stress reduction in carbide inserts were also analysed. This paper focuses on the study of the stress state in cut-off tools with brazed carbide inserts. The stress state in the carbide inserts and the influence of different fixation methods of carbide insert to the holder were considered. The main approach to stress studies was the photoelasticity method, which allows quickly and clearly obtaining and evaluating the results. Models of carbide inserts were made of optically sensitive material. It as a part of a complex model of a cut-off tool with a carbide insert with three different methods of fixation were loaded with a force by means of a specially designed stand simulating the cutting force. The study was carried out on a PPU-7 polarisation-projection unit. Isochromatic and isocline patterns were obtained. The estimation of the principal stresses was performed by the difference of shearing stresses for three cross sections of the insert: at the surface, in the middle and at the base. It was found that the best result is given by the method in which the insert on the side far from the cutting edge has a bevel made at an angle of 10°
Highlights
When making parts from a bar or a disc, which are fed through the spindle of a lathe, as a rule, the final operation is cutting
This paper focuses on the study of the stress state in cut-off tools with brazed carbide inserts
It as a part of a complex model of a cut-off tool with a carbide insert with three different methods of fixation were loaded with a force by means of a specially designed stand simulating the cutting force
Summary
When making parts from a bar or a disc, which are fed through the spindle of a lathe, as a rule, the final operation is cutting. Cutting takes place over the entire width of the narrow blade, which, is fixed on three sides by the backing Such conditions create a high load on the tool, both power and thermal, which, in turn, requires its high strength and durability. The study [3] claims that 40-50% of cutters with brazed carbide inserts fail due to breakage of the inserts, and not due to their wear during operation. Because such tools are quite expensive, it leads to significant unproductive material losses. The purpose of the study is to optimise the method of fixing the brazed carbide insert of the cut-off tool through the investigation of the stress state for different fixing options and increase the efficiency of the cutters
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: 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.
