Micromecanizado de un material biocompatible para la producción de prótesis: tántalo de 99,9% de pureza

Abstract

During the last decades, micromilling has been widely

researched for a wide variety of materials. However, the

behavior of many materials has not yet been studied in the

micro-machined area. Among these materials we can highlight

those that have wide applications in industries such as

aerospace, nuclear and biomedical. Within these last ones those

biocompatible materials are the focus of this work. Thanks

to its high melting point and its high resistance to corrosion,

tantalum can have diverse applications in the above mentioned

areas. In this paper we present the study of the cutting forces,

mainly in the feed direction, and the acoustic emission in the

micro-milling of 99.9 % purity tantalum with cemented carbide

tools without coating and with two different coatings, (Ti,Al)

N and DLC. The diameter of the tools was 500 µm, the cutting

speed and the cutting depth of the test were kept constant

with values of 63 m/min and 40 µm respectively, while 6 feed

rates were in order to observe the influence of the critical

undeformed chip thickness in the micro-milling operation.

The recorded emission acoustic results allowed to identify

the value of minimum chip thickness for each tool, while the

power spectrum density results allowed to identify dominant

frequencies of machining for different feeds per tooth.

Regarding the feed force, it was possible to identify a minimum

value for each tool as function of feed rate and the specific

cutting force values showed the typical nonlinear behavior of

the size effect.