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1

Surface Roughness Prediction in the Hardened Steel Ball-End Milling by Using the Artificial Neural Networks and Taguchi Method

Matras Andrzej

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 1

184--194

EN

The paper provides an analysis of the impact of the values of cutting tool inclination strategies and angles measured in the parallel and perpendicular to feed direction, radial depth of cut and feedrate on the surface roughness. The workpiece was made of the AISI H13 steel, hardness 50 HRC, and was machined using a ball-nosed end mill with CBN edges. The research methodology involved experiments conducted based on the Taguchi orthogonal array, optimization of parameters with the use of Taguchi method and process modelling using neural networks. Thanks to the use of neural networks, the analyses were performed for various levels of machining efficiency, obtained as a result of different radial depths of cut and feedrates. In order to obtain mathematical models well-describing strongly nonlinear impact of the cutting tool inclination strategies and angles, a separate neural network learned for each tool inclination strategy. The prediction of results was made using a set of neural networks. The analyses and experiments resulted in surfaces with very low Ra parameter of 0.16 μm and mathematical models with a good fit to the experimental data. Values of the cutting tool inclination angle that allow obtaining the surface of specific surface roughness were specified for various levels of machining performance.

2

Parametric model analysis, geometrical characteristics and tool trajectories to surface roughness when machining the cycloid screw by a five-axis milling machine

Pham Van Bong, Thien Nguyen Van, Nguyen Van Que, Duy Trinh Nguyen, Nguyen Duy Khanh, Tien Dung Hoang

Journal of Machine Engineering

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2022

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Vol. 22, No. 2

108--124

EN

To improve the screw machining accuracy in modern air compressors. This paper investigates three main issues during the development process for cycloid screw machining methods on five-axis CNC machine tools with high precision and efficiency. First, the theoretical basis of cycloid screw surface shaping and derivative of the final profile equation is established. Then, modeling the center trajectory and feed rate according to the cycloid screw profile is given. Next is the experimental setup and simulation of the cycloid screw machining process and discussions. The obtained surface quality prediction parameters are close to the actual measured value, which can be used as a reference model for five-axis CNC milling technology processes. All experimental results obtained by the proposed mathematical model show that a surface with good surface quality is created, meeting the requirements for surface quality. The main work can be used as references for engineers and technicians in practice.

3

Oceny stanu frezu kulistego w zmiennych warunkach obróbki elementów trójwymiarowych

Wittbrodt P., Łapuńka I.

Stal, Metale & Nowe Technologie

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2017

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nr 9-10

26--30

PL

W artykule przedstawiono problemy oceny stanu frezu kulistego przy obróbce elementów trójwymiarowych. Przedstawiono wybrane metody oceny zużycia ostrzy narzędzia w zmiennych warunkach skrawania.

EN

The paper presents some problems related to the ball nose end mill wear estimation during milling three-dimensional elements. The selected methods of tool wear assessment in variable milling conditions are presented.