Qualitative Evaluation of Machined Surface of Aluminum Alloy AlCu4Mg1 Depend on Feed Rate

This research pertains to rock cutting used negative rake angle. The parameters used are negative rake angles of 0 o , -5 o , -10 o , -15 o , -25 o , -30 o , and -40 o . Negative rake angle is known to play an important role in rock machining. Negative rake angle produces more chips powder in front of the tool surface. The interaction between these particles affects the radial force that suppresses the rock surface. A large radial force generates hydrostatic pressure around the tooltip. According to the findings of this research, negative rake angle -25 o leads to the largest radial force and smallest surface roughness for 15.17 N and 1.21 µm, respectively with smooth and uniform chips. The rock surface and the resulting chips powder was observed by scanning electron microscope (SEM) in order to prove the effect of hydrostatic pressure working on the tooltip. Meanwhile the hydrostatic pressure changed the brittle cutting mode into a brittleductile cutting mode.

Cutting Forces, Chips Formation and Surface Roughness in Rock Cutting Using Negative Rake Angle

Hermawan¹,

Soenoko²,

Irawan³

et al. 2020

Surface Properties of Powder Injection Moulded Parts Related to Processing Conditions

Hausnerová¹,

Sanétrník²,

Pata³

2018

The surface quality of ceramic items produced via powder injection moulding (PIM) at processing conditions varying in injection moulding temperature and debinding route is investigated. The analysis is performed on aluminium oxide part design containing complicated rotational areas, where a smooth surface of an internal spiral is a critical quality factor. Surface properties of the final sintered parts are examined with the help of a contactless scanner. Then, the obtained surface roughness data are treated with suitable statistical analytical tools in order to reveal the effect of the processing conditions during the PIM process on the final parts. Relating surface properties of final sintered parts to processing parameters might provide a powerful tool to control particular steps of PIM process.

Specially Designed Lattice Structure for Milling Cutter Supported by FEA

Hanzl¹,

Zetková²,

Zetek³

2019

Lattice structures are one way to reduce the weight of a component while respecting its strength requirements. These structures are based on cubic cells, therefore, they are not fully applicable to rotating parts which should be lightweight. This article particularly addresses this issue. A solution is sought for how to adapt lattice structures for a milling cutter. The final redesign of the topology allows a continuous flow of generated stress into the whole body of the cutter. Further, the solid part of the milling cutter is modified for Metal Additive Manufacturing (MAM) and the functionality of the optimised cutter is verified by Finite Element Analysis (FEA). The results of the analysis are compared with a conventional cutter with the same outer shell. The findings from the static analysis indicate that the milling cutter can be considered to be competitive.