Showing papers in "Journal of Materials Processing Technology in 1991"

TL;DR: Abrasive flow machining (AFM) as discussed by the authors can be used for deburring, radiusing, sizing, and polishing of precision parts, providing uniform, repeatable, predictable results.

TL;DR: In this article, the results of current investigations into the characteristics of wire electrical discharge machine (WEDM) generated surfaces were studied with a stochastic modeling and analysis methodology to better understand the process mechanism.

TL;DR: Deform as discussed by the authors is a two-dimensional FEM program capable of simulating a wide class of forming processes with various material models, and the automatic mesh generation and remeshing capability of deform system is proved to be an essential feature of a streamlined simulation procedure for industrial applications.

TL;DR: In this paper, a finite element program called forge3 is used to simulate hot forging of complex industrial parts using quadratic tetrahedra, and the simulation results show that the computation can be carried out using the described remeshing procedure and can be applied with success to even more complex geometries.

TL;DR: In this paper, an optimal passive dynamic absorber is proposed for milling, which is connected to the main system through passive elements (spring and damper) by using a two-degree-of-freedom structural model simulation.

TL;DR: In this paper, two different methods of surface finish measurement are examined and compared using a PC-based digital imaging system, and the advantages and disadvantages of these two methods are discussed and compared.

TL;DR: In this paper, a mathematical model of autoclave age forming of aircraft wing panels is developed and applied to age forming beam specimens, and a closed-form solution is obtained for a mold in the shape of a circular arc.

TL;DR: In this article, a hybrid computer-aided engineering (CAE) system for automatic process-sequence design for the manufacture of axisymmetric sheet-metal components has been developed.

TL;DR: In this article, computer simulation techniques capable of predicting, off-line, the resulting geometric errors in the finish end-milling of thin-walled sections are presented, and the effects of workpiece and cutter dynamic deflections on the chip load are included in the model.

TL;DR: The ultrasonic machining process uses a nonabrasive form tool, called a sonotrode, attached to a transducer/booster combination which vibrates at a frequency of approximately 20,000 cycles per second.

TL;DR: In this article, the numerical optimization of minimizing total production time per component for multipass turning operations subject to practical constraints such as force, power, machining speed and feed using sequential quadratic programming technique is presented.

TL;DR: A proof-of-concept knowledge-based tooling design system for progressive stamping dies that automatically selects punches, die blocks, side gages and other standard die components, and generates a 3-D representation of the assembled die.

TL;DR: In this paper, the authors investigated the possibility of an empirical wrinkling limit diagram by measuring the strain in industrial pressings formed so that wrinkling was induced, and they found that the stress state at wrinkling did not differ in a readily identifiable way from that at other points.

TL;DR: In this paper, a special purpose pre-and post-processing program was developed to calculate drawn tube dimensions, mechanical properties and required drawing forces from the specified tube drawing processing parameters.

TL;DR: A tool wear model based on Artificial Neural Network which is used as Pattern Associator, which is trained to associate an input vector, consists of readings of several different sensors, with an output vector, which consists of actual tool wear measurements.

TL;DR: In this article, the flow characteristics of deformation in the extrusion of composite rods (i.e., flow field, the girl distortion and the strain distribution) have been studied using the upper-bound approach and compared with experimental results.

TL;DR: In this article, the authors describe the development of a computerized system which makes use of knowledge engineering and process modelling for the optimum selection of grinding parameters for wheel wear and specific energy.

TL;DR: In this article, an implicit finite element program is used to analyze different metal forming processes and the underlying formulation is based on an elasto-plastic material model, including nonlinear work-hardening.

TL;DR: In this paper, the metal flow in ring rolling has been studied by using a pseudo plane-strain scheme which was incorporated into a finite element method-based model, and the average deformation of a ring during each rolling revolution is approximated by a kinematically steady state deformation process.

TL;DR: In this paper, the deformation and temperature distribution of stainless steel sheets with deformation-induced martensitic transformation are simulated by using the rigid-plastic finite element method and the finite-element method for heat conduction.

TL;DR: In this article, the authors developed a mathematical model for PECM and employed this model in a computer simulation of the process, and discussed the reasons for improved accuracy of PECMs versus direct current ECMs.

TL;DR: In this article, a wear sensor system for direct and almost on-line tracking the wear of an abrasive waterjet (AWJ) nozzle is proposed, which is based on the conductive loops which will be placed on the ceramic's substrate and embedded on the tip of the nozzle.

TL;DR: In this article, an analytical method using the upper bound elemental technique is proposed for the simulation of roll torque and profile formation during profile ring-rolling, where the plastic flow of material during rolling is described by dividing the whole deforming region at the roll gap into simple elements of rectangular cross-section and a kinematically admissible velocity field for the three-dimensional material flow in a typical element is derived.

TL;DR: In this article, the authors present a tool path for pocket milling operations in such a way as to avoid the occurrence of chatter, using NC programming subroutines to select from a database of acceptable cuts which will result in the maximum metal removal rate.

TL;DR: A view of these events from an industry perspective is presented, along with examples from the application of finite element methods for modelling the metal forming process, heat transfer and die stress analysis.

TL;DR: In this article, a method for simulating plastic deformation in forming of solid metals with a liquid phase was presented on the basis of the rigid-plastic finite element method, where the liquid phase is modelled as a strain-rate sensitive material with a low flow stress except for extremely small flow stress.

TL;DR: In this paper, the effects of workpiece speed and grinding wheel condition on the thickness of the white layer formed on an EN. 24 steel by centreless grinding is described, and the results discussed in terms of Shaw's indentation model of grinding are discussed.

TL;DR: In this paper, a general formulation for numerical finite element simulation of complex sheet forming processes with arbitrary tools is briefly introduced, and an incremental displacement (solid) approach is assumed, with special attention drawn to the choice of material models.

TL;DR: In this article, the as-hot-rolled microstructures were composed of fine grained polygonal ferrite-pearlite and the yield strength varied from 553 to 629 MPa (77 to 91 ksi).