Showing papers in "Journal of Materials Processing Technology in 1994"

TL;DR: In this article, the mechanisms of some laser-drilling processes, the types of laser used, the quality characteristics of a laserdrilled hole, the effects of drilling parameters, and the advantages and limitations of the laser hole-dilling operation are reviewed.

TL;DR: In this article, the development of mathematical equations using a four-factor 5-level factorial technique to predict the geometry of the weld bead in the deposition of 316L stainless steel onto structural steel IS 2062 is presented.

TL;DR: Abrasive-Flow Machining (AFM) is being used to deburr, polish, radius, remove recast layers, or produce compressive residual stresses in a wide range of applications.

TL;DR: In this paper, a number of recent developments in the finite element analysis of metal forming are discussed, with emphasis on the advantages and disadvantages of each technique for complex analyses involving contact.

TL;DR: In this paper, it was shown that very large increases in the formability of three materials are observed in the electrohydraulic forming of a conical section and moderate increases are observed by the electromagnetic expansion of aluminum rings.

TL;DR: In this paper, a strategy for FE-simulation is suggested and applied for upsetting of small cylindrical specimens, based on the experimental determination of the input data with conventional upsetting tests of specimens with dimensions corresponding to the micro-forming process.

TL;DR: In this paper, the trade-off between the material removal rate and the level of near-surface damage involved in the machining of CMCs has been considered, and the state-of-the-art of the various aspects of this venture has been reviewed.

TL;DR: A detailed description of the state of the art for lubricant systems for cold forging of C-steels and low alloy steels as well as aluminium alloys including all the basic operations such as cleaning of the slugs, application of eventual conversion coating and lubrication is given in this paper.

TL;DR: In this paper, a numerical procedure which integrates optimization and finite element analysis is developed for solving a three dimensional parameter estimation problem in elasto-viscoplasticity, which is performed using a modified Levenberg-Marquardt method to take into account the constraints on the parameters.

TL;DR: In this article, a method for the determination of the heat-transfer coefficients in bulk metalforming processes is presented, where the temperature distributions within two dies, one of which simulates the cold forming tool and the other the hot workpiece are brought into contact under closel controlled conditions.

TL;DR: In this paper, the authors introduce the present status of the application of these materials to autobody parts and discuss the problems on forming these materials from the point of material characteristics and forming techniques.

TL;DR: In this article, the influence of cutting tool coatings on flank wear and surface finish was investigated and it was found that a triple-coated carbide, having a top layer of TiN, performed best in terms of flank wear but gave the poorest surface finish.

TL;DR: In this paper, the authors investigated the cyclic nature of a cyclic cutting event when a CO2 laser in conjunction with an oxygen jet is used to cut mild steel and showed that the self-limiting nature of the oxidation of the steel in the cut zone can explain the nature of cut edge striation produced by cyclic oxidation reaction.

TL;DR: In this article, a model describing workhardening at ambient temperature for moderate to large strains is presented, based on a differential equation describing the evolution of dislocation density, which is complemented by a formula for computing dislocation cell size.

TL;DR: In this paper, the authors discussed the kerf formation of a ceramic plate cut by an abrasive waterjet and found that the wall finish achieved is determined by the mesh size of the abrasives: sufficient hydraulic pressure with fine abrasives will produce a smooth surface comparable to that from grinding.

TL;DR: In this article, the influence of submerged arc welding parameters and flux basicity index on the weld chemistry and transfer of elements manganese, silicon, carbon and sulphur has been investigated, five fluxes and different values of the welding parameters being used for study.

TL;DR: In this article, a high temperature plasma arc is used to provide intense localised heat, softening only the chip material, leaving the work piece relatively cool and metallurgical undamaged.

TL;DR: In this article, the authors present a literature survey and discussion of the various methods and mechanisms of Nd: YAG laser marking of plastic and ceramic IC packages, and the effects of the material properties (e.g., the absorptivity and the melting point) and the marking parameters on the mark legibility characteristics, such as the mark contrast and the mark width, are reviewed.

TL;DR: In this article, the causes of fatigue failure in cold forging tooling and a fatigue analysis concept that can be applied during process and tool design to estimate the tool life of a layout is presented.

TL;DR: In this article, the effect of tool wear and chip-form change in face milling was investigated and the results indicated that the ringdown counts, rise time increase with progressive tool wear; however number of events and event duration are sensitive to chip form.

TL;DR: In this paper, the results from Semi Solid Forming (Mushy State Forming, Thixoforming) of various aluminum alloys including usually wrought alloys are presented.

TL;DR: In this paper, the authors discuss the functions that have to be performed during the determination of bending sequences, focusing on accuracy aspects, in an integrated CAPP system such as PART-S, which is under development presently in the author's laboratory.

TL;DR: In this article, a comparative study of the work roll texturing systems shot blast texturing, electric discharge texturing (EDT), electron beam texturing and laser texturing is presented.

TL;DR: In this article, a three dimensional finite-element model for ring rolling is described, based on the updated Lagrangian approach, and a special hybrid mesh model has been developed which significantly increases the accuracy and computational efficiency of the simulation.

TL;DR: In this paper, a simple heat-transfer model is derived by means of successive stationary solutions of the heat conduction equation, enabling the thermal stress to be calculated easily if the oxide scale situation is determined.

TL;DR: In this article, the authors demonstrate that most of the guesswork in form roll design can be eliminated with sufficient knowledge of strains in the workpiece and demonstrate that simulation of the cold roll forming process using finite element analysis has proved promising and the resulting models are in agreement with experimental design data.

TL;DR: In this article, the authors report on the fabrication of bimetallic components consisting of aluminium and copper plates by explosive cladding and subsequent rolling, and evaluate the surface integrity of the resulting bimetallics in terms of surface topography, microhardness variation and metallurgical changes through the thickness of the cladded/rolled plates.

TL;DR: In this paper, the authors dealt with the deep drawing of circular blanks into cylindrical cups through a conical die using flat-bottomed and hemispherical-ended punches.

TL;DR: In addition to traditional machining, a number of technologies have been developed to perform the cutting and drilling operations that are necessary even with modern near-net-shape processing as discussed by the authors.