Showing papers in "CIRP Annals in 2006"

TL;DR: In this article, the main drivers, developments and future requirements in the field of micromanufacturing as related to the machining process from the perspective of the recent research and development literature are reviewed.

TL;DR: In this paper, the authors present an overview of the current state of the art in modeling and simulation of grinding processes: physical process models (analytical and numerical models) and empirical process models(regression analysis, artificial neural net models) as well as rule based models (rule based models) are taken into account.

TL;DR: In this paper, the authors report the worldwide technical developments and state-of-the-art of electro-physical and chemical micromachining processes and issues related to the supporting technologies such as standardization, metrology and equipment design are briefly assessed.

TL;DR: In this paper, the effect of the elements on physical phenomena such as laser absorption, heat transfer, wetting and spreading of the melt, oxidation, Rayleigh instability and Marangoni convection was investigated.

TL;DR: In this paper, an overview of research activities in the field of forming operations at elevated temperatures is presented, where the use of elevated temperatures as a process parameter in forming operations represents a potential solution approach.

TL;DR: In this paper, an experimental setup is introduced, which enables the determination of the material's flow behaviour according to the hot stamping time-temperature-characteristics. And the results of investigations on the thermo-mechanical flow properties of the quenchenable, ultra high strength steel 22MnB5 in dependency of the temperature, the strain and the cooling rate etc.

TL;DR: In this article, a procedure for model-based calibrating 5-axes machining centers is presented, where the exact kinematic configuration of the machine tool can be identified by numerically reproducing the errors that would cause deviations closest to the ones measured.

TL;DR: In this paper, the state of the art in scanning force microscopy for dimensional metrology is described and a detailed description is given of the important factors affecting the major components of a scanning force microscope from the metrological point of view.

TL;DR: In this paper, the authors present two designs of experiments, which formalise the forming parameters critical in SPIF and the degree to which they affect formability, and show that these parameters affect the ability of SPIF to form a part.

TL;DR: In this article, the authors consider the influence of the helix angle and the consequent phase lag between the forces appearing at different sections of the mill, and conclude that the effect of the angle has an important influence on the areas of added lobes (flip lobes).

TL;DR: In this paper, the authors identify the fundamental differences in the integrity of hard turned and ground surfaces and the subsequent impact on rolling contact fatigue life and show that mechanical deformation plays a larger role during hard turning than grinding, while the size effect in grinding induces higher surface hardness.

TL;DR: In this paper, a self-piercing rivet was used to join an ultra high strength steel and an aluminium alloy sheet by optimising shapes of the die, and the resulting steel and aluminium alloy sheets were plastically joined by a self piercing rivet.

TL;DR: In this article, a thermo-chemical process for modifying the chemical composition of the subsurface zone was developed to avoid chemical reactions between the carbon of the diamond tool and the iron of the workpiece.

TL;DR: In this article, the results of an extensive experimental investigation concerning size effects on surface generation by ball nose and flat end micro milling hardened tool steel were presented, where cutting parameters were selected on the basis of a modular description of the uncut chip geometry.

TL;DR: In this article, an ultrasonic vibration assisted polishing machine was developed to finish micro aspheric dies and molds with diameter less than 3mm, and a small polishing tool was mounted on a 3-axis controlled table, and vibrated at an ultra-asonic frequency with piezo-electric actuators.

TL;DR: A simple insulation method using enamel coating on the side wall of the tool electrode was introduced in this paper, which was not sensitive to the machining depth and was effective for machining high aspect ratio structures.

TL;DR: In this article, a strip drawing test with deflection in combination with a numerical identification is used to identify the tribological size effects within sheet metal forming and to develop a size-dependent friction function for the integration in the FEM-simulation.

TL;DR: In this article, a laser-drilled pilot hole is rimmed out by EDM drilling, and a hybrid process has been proposed to eliminate recast and heat affected zones typically associated with the laser drilling process.

TL;DR: In this paper, a tracking control strategy for high speed ball screw drives is presented, where torsional vibrations are modeled, experimentally identified, and compensated in the control law using notch filtering and active cancellation techniques.

TL;DR: In this paper, an innovative monitoring and control approach, aimed to define and in-process update the most relevant process parameters during an industrial single point incremental forming (SPIF) operation, is proposed.

TL;DR: In this paper, the authors present a methodical concept for the evaluation of manufacturing systems using real options in order to incorporate flexibility in the decision-making process, which is the major barrier in integrating flexibility into the decision making process.

TL;DR: In this paper, the authors proposed an approach to evaluate the overall performance of the system considering both quality and production logistics, and the results obtained by the application of the method provide new insight in the relations among the two areas and pave the way to the joint design of production logistics and quality control systems.

TL;DR: In this article, a selective disassembly methodology for EOL products is presented, which was developed by reversing and modifying the methodology developed by Nevins and Whitney (1989) for assembly.

TL;DR: In this article, an alternative process has been developed by effective use of solid-state reaction between the CeO 2 abrasives and Si. The results show that the surface is generated by fixed abrasives following grinding dynamics, no defect or structural imperfection is introduced during fabrication and far better quality is achieved than that by CMP.

TL;DR: In this paper, the authors present the layout of a tool path calculation based on the NURBS data format that has been developed at the Fraunhofer IPT, and the interfaces and the hardware and software for the realisation of a NurBS based control unit for Fast Tool Servo turning and local corrective polishing operations.

TL;DR: In this paper, a laser beam is used as a non-contact thermal dressing tool for a bronze-bonded diamond wheel, where the pulsed Nd:YAG laser beam was irradiated on the wheel surface and the bond material partially removed by laser irradiation only.

TL;DR: In this article, a 3D coupled thermo-mechanical finite element model for the simulation of segmented chip formation in metal cutting is presented, where the generation of segmentation is achieved either by element erase with respect to damage or by modification of material flow stress data; both being coupled with continuous adaptive remeshing.

TL;DR: In this paper, a magnetically stabilized jet of magnetorheological fluid was used for precision polishing of concave concave optics, and the results demonstrate the suitability for this technique for precision finishing of complex shapes.

TL;DR: A novel collaborative robot system (“Cobot”) capable of sharing the workspace with the human co-worker and collaborating with him through direct physical contact is presented.

TL;DR: In this article, the authors report on specifics when rough and finish turning these new Ni-based alloys and use multi-objective quality criteria to assess the capability of shaping RR_X alloys.