Experimental investigation on tool wear and measurement method in micro milling with carbide tools

Die Prozesssicherheit beim Mikrofräsen lässt sich mit einer gezielten Schneidkantenverrundung erheblich steigern. Dabei werden durch verschiedene Präparationstechnologien unterschiedliche Geometrien und Einflüsse auf den Fräsprozess erzeugt. Der Fachbeitrag behandelt den Einsatz präparierter Mikrowerkzeuge in Zerspanversuchen, in denen auf die Zerspankräfte, den Verschleiß sowie die Oberflächengüten eingegangen wird.   Process reliability in micro milling can be increased by a defined cutting edge preparation. Different cutting edge preparations cause different effects on tool behavior in the downstream micro milling process. In this paper, the process forces, the tool wear and the surface quality of prepared micro milling tools are characterized in cutting tests.

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Cutting Performance of Different Coated Micro End Mills in Machining of Ti-6Al-4V

Micromachines ◽

10.3390/mi9110568 ◽

2018 ◽

Vol 9 (11) ◽

pp. 568 ◽

Cited By ~ 5

Author(s):

Zhiqiang Liang ◽

Peng Gao ◽

Xibin Wang ◽

Shidi Li ◽

Tianfeng Zhou ◽

...

Keyword(s):

Tool Wear ◽

Cutting Edge ◽

Micro Milling ◽

End Mill ◽

Coating Materials ◽

Edge Chipping ◽

Workpiece Surface ◽

Micro End Mill ◽

End Mills ◽

Flank Surface

Tool wear is a significant issue for the application of micro end mills. This can be significantly improved by coating materials on tool surfaces. This paper investigates the effects of different coating materials on tool wear in the micro milling of Ti-6Al-4V. A series of cutting experiments were conducted. The tool wear and workpiece surface morphology were investigated by analyzing the wear of the end flank surface and the total cutting edge. It was found that, without coating, serious tool wear and breakage occurred easily during milling. However, AlTiN-based and AlCrN-based coatings could highly reduce cutting edge chipping and flank wear. Specifically, The AlCrN-based coated mill presented less fracture resistance. For TiN coated micro end mill, only slight cutting edge chipping occurred. Compared with other types of tools, the AlTiN-based coated micro end mill could maximize tool life, bringing about an integrated cutting edges with the smallest surface roughness. In short, the AlTiN-based coating material is recommended for the micro end mill in the machining of Ti-6Al-4V.

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Experimental Investigation of Fully Plastic Contact of a Sphere Against a Hard Flat

Journal of Tribology ◽

10.1115/1.2164470 ◽

2005 ◽

Vol 128 (2) ◽

pp. 230-235 ◽

Cited By ~ 27

Author(s):

J. Jamari ◽

D. J. Schipper

Keyword(s):

Experimental Investigation ◽

Contact Pressure ◽

Contact Area ◽

Measurement Method ◽

Contact Load ◽

Model Predictions ◽

The Mean

In this paper we report the experimental investigation to evaluate the published models for the contact of a deformable sphere against a hard flat in the fully plastic contact regime. A new measurement method has been used to measure the contact area. The behavior of the mean contact pressure and the contact area as a function of the contact load are presented. Substantial differences are found between the measurements and the model predictions. A constant value of the mean contact pressure as the load increases is observed, however, the value is lower than the hardness, as often reported. The contact area is found to be a simple truncation of the sphere by a hard flat.

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