Impact of cutting forces on surface quality in finish face milling of compacted graphite iron with CBN and nitride ceramic tools
The article presents the results of studies to determine the influence of cutting forces on the quality parameters of machined surfaces as a result of finishing face milling of products made of compacted graphite cast iron (CGI) using round cutting inserts made of cubic boron nitride (CBN) and nitri...
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| Format: | Article |
| Language: | English |
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Zhytomyr Polytechnic State University
2025-07-01
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| Series: | Технічна інженерія |
| Subjects: | |
| Online Access: | https://ten.ztu.edu.ua/article/view/334016 |
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| Summary: | The article presents the results of studies to determine the influence of cutting forces on the quality parameters of machined surfaces as a result of finishing face milling of products made of compacted graphite cast iron (CGI) using round cutting inserts made of cubic boron nitride (CBN) and nitride ceramics (NC). Based on the results obtained, second-order regression models were constructed to describe the change in cutting forces and roughness with cutting speed, feed rate, and depth of cut for CBN and NC. The regression dependencies were built using the response surface method (RSM) with the Box-Behnken design in the JMP software package. This made it possible to build accurate dependencies of cutting forces and roughness Ra on machining parameters and to predict machining results according to the specified parameters. For all the built models, the value of the determination coefficients R² is 96–99 %, which indicates a high accuracy of approximation of the experimental data. The results obtained make it possible to optimize the process of finishing the CGI due to the rational choice of milling modes with a constant geometry of the cutting tool. The optimal cutting modes provided minimal cutting forces and roughness
parameters. In general, when using cubic boron nitride inserts, the cutting forces were lower than when using nitride ceramic inserts. For CBN, the resulting cutting forces were 90–185 N, and for NC 140–220 N. Both materials have proven to be good at finishing flat surfaces of products made of vermicular graphite cast iron. The machined surface roughness Ra did not exceed 0,44 microns. At a cutting speed of 800 m/min feed rate of 0,1 mm/tooth and a cutting depth of 0,08 mm, the Ra roughness value for CBN was 0,16 μm, for nitride ceramics – 0,23 μm. |
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| ISSN: | 2706-5847 2707-9619 |