Research Article
Theoretical Determination of Changes in Chain Networks Lengths
Akbarov Dostonbek Axmadali Ogli*
,
Xusanov Yunusali Yuldashalievich
Issue:
Volume 13, Issue 2, June 2026
Pages:
22-27
Received:
1 June 2026
Accepted:
10 June 2026
Published:
26 June 2026
DOI:
10.11648/j.ajma.20261302.11
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Views:
Abstract: This article presents the results of a study on improving surface quality during the mechanical machining of complex-shaped sections of metal mold components manufactured for the production of plastic products by injection molding. In the conventional milling method, narrow guide grooves (2.9 mm in width, 2.0 mm in depth) require machining with small-diameter end mills (D=2.5 mm). Such cutters have low stiffness, are prone to vibration, wear quickly, and degrade the surface quality. The study proposes a technology in which the difficult-to-machine section is manufactured as a separate part and installed into a seat formed in the main mold component by means of an interference fit. This approach eliminates the need for special fixtures and enables the use of larger-diameter (D=12 mm) rigid end mills. Experimental investigations were conducted on 40X structural alloy steel, comparing conventional milling with the proposed separate part technology. A power-regression mathematical model relating surface roughness to the main cutting parameters (cutting speed and feed per tooth) was developed and validated against experimental data. The results showed that surface roughness improved by 45.8% (from Ra=1.42 to Ra=0.77 μm), machining time decreased by 18.4%, and tool stiffness increased by a factor of 179. The proposed technology was implemented at the Navoi Machine-Building Plant, confirming its practical effectiveness.
Abstract: This article presents the results of a study on improving surface quality during the mechanical machining of complex-shaped sections of metal mold components manufactured for the production of plastic products by injection molding. In the conventional milling method, narrow guide grooves (2.9 mm in width, 2.0 mm in depth) require machining with sma...
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Research Article
Influence of Milling Parameters on Surface Roughness and Tool Wear During Milling of Composite Materials
Fayzimatov Shukhrat,
Rustamov Bannobjon*
Issue:
Volume 13, Issue 2, June 2026
Pages:
28-34
Received:
1 June 2026
Accepted:
10 June 2026
Published:
26 June 2026
DOI:
10.11648/j.ajma.20261302.12
Downloads:
Views:
Abstract: Composite materials are widely used in aerospace, automotive, and mechanical engineering industries because of their excellent strength-to-weight ratio, high stiffness, corrosion resistance, and durability under demanding operating conditions. These advantages make them attractive for the production of lightweight and high-performance components. However, the machining of composite materials remains a challenging task due to their heterogeneous structure, anisotropic behavior, and abrasive characteristics. During milling operations, these properties can lead to unstable cutting conditions, increased cutting forces, rapid tool wear, and deterioration of surface quality. The present study investigates the influence of cutting parameters and tool wear on the machining quality of composite materials during CNC milling processes. Particular attention is paid to the effects of cutting speed, feed rate, and depth of cut on the cutting performance and the quality of the machined surface. Experimental investigations were conducted under various machining conditions to evaluate the relationships between process parameters, tool wear progression, and machining outcomes. The results of the study indicate that machining parameters significantly affect cutting force behavior, surface roughness, and tool life. Among the investigated factors, feed rate was found to have the most pronounced influence on cutting force fluctuations, surface finish quality, and the rate of tool wear. An increase in feed rate resulted in higher cutting loads and accelerated wear of the cutting tool, which negatively affected the quality of the machined surface. The findings of this research contribute to a better understanding of composite material machining and provide useful recommendations for selecting optimal CNC milling conditions to improve productivity, reduce tool wear, and achieve higher surface quality.
Abstract: Composite materials are widely used in aerospace, automotive, and mechanical engineering industries because of their excellent strength-to-weight ratio, high stiffness, corrosion resistance, and durability under demanding operating conditions. These advantages make them attractive for the production of lightweight and high-performance components. H...
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