Showing papers in "CIRP Annals in 2007"

TL;DR: In this article, the authors describe which types of laser-induced consolidation can be applied to what type of material, and demonstrate that although SLS/SLM can process polymers, metals, ceramics and composites, quite some limitations and problems cause the palette of applicable materials still to be limited.

TL;DR: In this article, the main change drivers for a manufacturing en-terprise can be classified and operationalized, and the evaluation and economic justification of changeability are addressed and a control loop is presented.

TL;DR: In this paper, an overview of analytical methods to calculate grinding temperatures and their effect on thermal damage is presented, which consists of modeling the grinding zone as a heat source which moves along the workpiece surface.

TL;DR: In this article, the authors present the state of the art in the metrology of freeform shapes with focus on the freeform capabilities of the most important measuring techniques and on related metrological issues.

TL;DR: In this article, a review of widely used temperature measurement methods and how they can be applied to temperature monitoring during material removal is presented, using criteria critical in measuring material removal, and the results presented in guide-format for participants in this field of work.

TL;DR: In this article, a single point incremental forming accuracy suffers from contradictory material requirements: while a low yield strength and low hardening coefficient are favorable in terms of limiting process forces and springback, they also result in excessive, unwanted plastic deformation in zones bordering processed areas.

TL;DR: In this paper, a method for the calculation of the Cartesian stiffness based on the polar stiffness and the use of the Jacobian matrix is introduced, and the results of the identification and the experimental validation are evaluated and conclusions are drawn.

TL;DR: In this paper, a step-by-step process for selecting laser sintering of PEEK is described, where the porosity of porosity can be varied from zero to 15% on mechanical properties.

TL;DR: In this article, the CIRP community's collective efforts to establish such a scientific foundation according to the “Observation → Hypothesis → Theory” development pathway are reported.

TL;DR: The metrology of relevant physical and chemical aspects of surfaces is considered, which includes the adsorption of biomacromolecules, which is pivotal for biocompatibility.

TL;DR: In this paper, the degradation kinetics of biomagnetic alloys are adjusted via surface (e.g. topography) and subsurface properties of the implant determined by the manufacturing process and a specific degradation profile adapted to the individual medical application is achievable.

TL;DR: In this article, the authors present a review of the current developments in mechatronic systems for metal cutting and forming machine tools and their interaction with manufacturing processes, including active and passive damping of vibrations through piezo, magnetic and electro-hydraulic actuators.

TL;DR: In this paper, an ultrasonic elliptical vibration cutting is applied to the ultra-precision machining of tungsten alloy molds for optical glass parts in the present research.

TL;DR: Incremental bulk forming is the oldest known technique in metal working as discussed by the authors, and many developments in this field have dramatically changed our society, including the development of new machinery for incremental bulk forming, advanced methods for process planning, occurrence of failure modes and the properties of finished products.

TL;DR: In this article, the authors present the general principles of autonomy and the proposed concepts, methods and technologies to realize autonomous processes in assembly systems, different approaches for design and autonomous operation of assembly, and future trends towards fully autonomous components of an assembly system as well as autonomous parts and products.

TL;DR: In this article, a new method based on systematic optimization to design cooling ducts in tool is introduced, and the optimization procedure was coupled with FE analysis and a specific evolutionary algorithm.

TL;DR: In this paper, the authors introduce two different types of complexity: (i) complexity by design and (ii) intrinsic complexity of multi-disciplinarity, from the viewpoint of knowledge structure, and illustrate two multi-disciplinary design cases and analyzes their knowledge structure to clarify how and why these couplings happened.

TL;DR: In this paper, the authors present an overview of the Computer Aided Process Planning (CAPP) field and describe a holistic component manufacturing process planning model based on an integrated approach combining technological and business considerations.

TL;DR: A predictive model for residual stresses in orthogonal cutting is presented in this article, which uses process conditions as inputs and predicts surface and sub-surface residual stress profiles due to machining.

TL;DR: In this paper, a model of a machine tool with all relevant components was simulated and matched with experiments to demonstrate the approach to predict the machining results exactly, large movements on flexible structures have to be calculated.

TL;DR: In this paper, the authors describe concepts and first results for solving the problems of accuracy and reliability of the results of computed tomography (CT) in medical diagnostics, and present CT-specific reference standards and procedures for their application.

TL;DR: In this article, a realistic simulation of the chip formation and of the related cutting forces and chip temperatures serve to better process understanding by implementing a material model into the FE-simulation which besides strain, strain rate and temperature includes ductile damage, a realistic description of the material behavior becomes possible.

TL;DR: In this paper, a micro milling tool made of polycrystal diamond (PCD) was developed to cut micro aspheric molds and dies made of ceramics.

TL;DR: In this paper, the authors presented a mathematical approach to reconfigure process plans to account for changes in parts' features beyond the scope of the original product family by inserting/removing features iteratively using a novel 0-1 integer programming model.

TL;DR: In this paper, a linear motor-driven aerostatic planar motion table system was developed for nano-machining and the results of actual machining tests confirmed that the developed table system has a remarkable performance.

TL;DR: In this article, a micro wire electrochemical cutting process was developed, where a very thin metal wire electrode was used as the wire electrode and a tungsten wire electrode with the diameter of 5μm was electrochemically in situ fabricated for the production of micro structures with the slit width of less than 20μm.

TL;DR: In this paper, the effect of wheel wear and operating parameters on grinding of a nickel alloy was investigated and validated using a power model based on models for grinding with conventional aluminum oxide wheels.

TL;DR: In this article, a methodology that integrates the assembly Product Design and Planning (PDP) activities with the WDP activities to improve the efficiency and quality of assembly design and planning at the early design stage is presented.

TL;DR: In this article, new experimental data is presented on Forming Limits in Single Point Incremental Forming (SPIF), which is a sheet metal forming process which does not require dies.

TL;DR: In this paper, a methodology for the joint design and reconfiguration of product families and assembly systems over several product generations is proposed to cope with the intense global competition that is characterized by high product variety and short life cycles.