Abstract: In an increasing competitive market where offer exceeds demand, developing customer
value is nowadays a key driver of industrial activities. Reducing costs, increasing quality, deliver on
time and the introduction of the right product quickly are unavoidable elements to succeed. A higher
product variety for mass production and short lead-time are main features of mass customization.
Flexibility arises as a productive and competitive factor to face it, of particular interest in assembly
systems, which allow the postponement of final variety, integrating all former tasks of the supply
chain. In this scenario, flexibility helps to face uncertainty in decision-making, while the increase of
system complexity requires extra control and management efforts. Both flexibility and complexity
are briefly reviewed. Next, it is introduced a joint analysis of flexibility and complexity useful for
decision-making. Both are linked to the uncertainty of the possible states of the system and a
quantitative approach of general application is presented. Finally, based on a model simulation, a
first case application illustrates product variety increase in an assembly system and some decisionmaking
Abstract: Frequently, to validate FEM simulations of the cutting process it is compared the
predicted results with the experimental cutting forces. In addition, other parameters are measured
and it is possible to predict the chip geometry in some particular conditions. This paper presents a
new development of the photogrammetry and its applications in the study of the chip geometry. In
the orthogonal milling case, it is possible to obtain a 3D model of the deformed chip employing
photogrammetry digitization techniques.
Abstract: Many investigations have been developed related to precision machining with features in
the millimetre scale. In this paper different cutting force models for micromilling are analyzed and
compared. A new model based on specific cutting force that also considers run-out errors has been
developed. The estimated cutting forces obtained with this model had good agreement with the
experimental data. Also, the proposed model allows to be implemented within the machine control
for the on-line optimization of the micromilling process.
Abstract: The equal channel angular drawing (ECAD) process is an innovative method to obtain
materials with high plastic strain in a continuous way. This deformation is higher than the
deformation achieved by a conventional wire drawing process, for the same reduction of the cross
section, so if an adequate thermal treatment is employed later, it could be possible to obtain an
initial material with high value that could be useful in conventional manufacturing processes. This
process consists in drawing a material through a die where two circular channels intersect at an
angle between 90º and 135º. In this work a study using finite element of the plastic strain and the
stresses that appear for one aluminium alloy AA-1370 has been carried out. Two ECAD passes have
been made, where for the second pass the billet has been rotated 180º along the longitudinal axis.
Finally, a calibrated pass has been carried out in order to obtain the billet with homogeneous
dimensions in all the cross section. All the simulations have been calculated at room temperature
and by using good conditions of lubrication. In order to perform the FEM simulations, a three
dimensional geometry has been used. To analyze by FEM the second ECAD pass and the
calibration pass, the deformations and stresses achieved in the previous passes have been taken into
consideration. This has been done with the aim of achieving higher accuracy. Moreover, a
comparative analysis with experimental results has been carried out.
Abstract: The main objectives of this work are the study of the obtained surface roughness on
steels, using face cutting edge inserts milling tools in finishing face milling operations with
microlubrication (MQL), and comparison of the results obtained with the widely-used radius
inserts. This experimental study analyzes the roughness and surface appearance obtained with both
sort of inserts. The interest about this study is to determine the steel types and the optimal cutting
conditions for milling with this face cutting edge inserts. Another result analysed is the utility of the
MQL implementation compared to the dry system.
Abstract: Light alloys are increasingly applied in different industrial sectors, mainly aerospace.
Because of this, it is needed to analyze their behavior in the different processing procedures and,
specially, machining. On the other hand, up to a few years, cutting fluids were successfully
employed in these processes since their coolant and lubricant properties. Notwithstanding,
environmental necessities have promoted researches focused on the development of cleaner
processes avoiding cutting fluids, in particular, dry machining. However, this process can change
tool geometry and affect to the material giving rise to changes in the design specifications. In this
work, geometrical deviations, particularly straightness deviations, in the dry turning of UNS
A92024 (Al-Cu) alloy are studied as a function of feed and cutting speed through a parametric
Abstract: In this paper, a 3D dynamic model for the prediction of the stability lobes of high speed
milling is presented, considering the combined flexibility of both tool and workpiece. The main aim
is to avoid chatter vibrations on the finish milling of aeronautical parts, which include thin walls and
thin floors. In this way the use of complex fixtures is eliminated. Hence, an accurate selection of
both axial depth of cut and spindle speed can be accomplished. The model has been validated by
means of a test device that simulates the behaviour of a thin floor.
Abstract: For effective rough milling, an optimized criterion is required to select the feedrate. In this
study, a method to obtain the most appropriate reference cutting force for rough milling was
developed. The reference cutting force was determined by considering the transverse rupture strength
of the tool material and the area of the rupture surface. A finite element method analysis was
performed to accurately calculate the area of the rupture surface. Using the analyzed results, the effect
of various cutting parameters on the chipping phenomenon was determined. The calculation method
for the reference cutting force considered the area of the rupture surface, the effect of the rake angle,
and the axial depth of cut. The experimental results clearly show that the reference cutting force
obtained from the proposed method met the desired constraints.
Abstract: The objective of this study is to compare the machinability of a sintered steel sample with
that of a nodular graphite iron sample. We have developed a method that not only allows us to study
the machinability, but also enables us to determine the optimum cutting conditions to suit criteria
for maximum production or maximum quality. The method is based on a drilling test using constant
axial force at the tip of the drill.