Showing papers in "Journal of Materials Processing Technology in 1992"

TL;DR: In this paper, a series of turning tests were conducted on a number of different cutting-tool materials to machine an Al/25 vol% SiC metal-matrix composite and the influence of the cutting speed on the tool wear, the surface finish, and the cutting forces was established for each tool material.

TL;DR: In this paper, the high temperature flow curves for three stainless steels were calculated up to the peak stress σ p and peak strain ϵ p by using the sinh-Arrhenius constitutive equation.

TL;DR: In this paper, a friction test based on a double backward-extrusion process is proposed and examined in order to obtain information on lubrication quality, where the upper punch moves downwards, while the lower punch and the die are stationary.

TL;DR: In this article, a micro-computer-based optimization technique has been developed to optimize grinding conditions, viz. wheel speed, workpiece speed, depth of dressing, and lead of dressing.

TL;DR: In this article, the results from a series for drilling tests undertaken on a 25% volume fraction Al/SiC metal-matrix composite were reported. And the results indicated that the hardness of the tool material has a significant influence on cutting-edge wear and on the drilling-torque and thrust-forces experienced.

TL;DR: In this paper, a new concept for the simulation of wear is presented, based on a survey of wear prediction methods, which are suited to be used in the design stage in order to optimize the process.

TL;DR: An overview of hot isostatic pressing can be found in this paper, where the authors consider the application of HIP to the healing of castings, diffusion bonding, powder metallurgy and ceramics.

TL;DR: In this paper, the results obtained with different cutter/insert combinations when machining nickel alloys under various cutting conditions were discussed, and it was shown that the K20 grade of cemented-carbide tools out-performed the K40 grade when milling with a 45° approach-angle cutter having negatively raked carbide inserts.

TL;DR: Deform as mentioned in this paper is a two-dimensional computer code developed by Battelle Columbus Laboratories, which is used extensively by non-aerospace forgers for the investigation of die fill, defect analysis and prevention, as well as for the prediction of part properties.

TL;DR: In this article, a method for estimating the value of the shear friction factor using a backward extrusion-type forging was proposed, which uses forging load multiplied by the bottom thickness in a backward-extraction test as a measure to calibrate the friction factor.

TL;DR: In this article, a fully coupled elastoplastic damage theory at finite strain is presented, where the energy-based Von Mises yield criterion and the damage evolution criterion with two damage variables are postulated through the hypothesis of energy equivalence.

TL;DR: In this paper, the authors re-examined the sinh equation relating peak stress σ p, strain rate dot ϵ (dot ϵ 0 = 1 s −1 ) and temperature T for hot working and developed a new algorithm for determining the material constants α, n, Q and T′.

TL;DR: In this paper, the machinability of high-strength carbon fiber-epoxy composite materials in turning has been investigated experimentally and the chip formation mechanisms and the Taylor tool-wear constants have been determined and the surface roughness has been measured with respect to cutting speeds and feeds.

TL;DR: In this paper, the effects of varying heat inputs on the properties of the HAZ (heat affected zone), e.g., hardness, the impact toughness, the tensile strength, the microstructure and the corrosion rate, are documented.

TL;DR: In this paper, the results of the ball-burnishing experiments on 3-D curved surfaces were analyzed and a set of machining parameters selected therefrom were applied to the ball burnishing of the free-form surface.

TL;DR: The pressure infiltration process as discussed by the authors was developed at Massachusetts Institute of Technology and is suitable to produce bulk or final-shape composite parts inexpensively, and is particularly suitable for research and limited production, as the processing parameters such as pre-form temperature, infiltrating metal temperature and cooling rate can be accurately controlled.

TL;DR: In this article, the effects of variations in tool geometry on the punching/blanking force and deformation of the punching, a parameter highly relevant to the assessment of tool performance in terms of the accuracy of the manufactured components, are investigated.

TL;DR: In this paper, the application of the incremental updated Lagrangian elasto-plastic finite-element method to the V-shape sheet-bending process is explored, in particular, the selective reduced integration is adopted to form the stiffness matrix and the extended r-minimum technique is used to deal with the elasticplastic state and contact problems between the toolmetal interface.

TL;DR: In this paper, the authors deal with some cold-and warm-forging applications such as automotive joint parts and gears, and introduce applications of CAD, CAM and CAE to cold and warm forging.

TL;DR: In this paper, results of two investigations concerned with the evaluation and prediction of fatigue failure and the improvement of tool service life in cold forging are presented, which clearly indicate the value of performing a tool stress analysis during the process and tool design phase.

TL;DR: In this paper, the results of bead-on-plate weld measurements are presented to determine the effects of the process variables on the bead width for the submerged-arc welding process, at a heat input of 3 kJ/mm.

TL;DR: In this article, a tool wear monitoring system was developed on a personal computer installed with a Fast Fourier Transform (FFT) card to detect the onset of tool failure during machining.

TL;DR: In this paper, the characteristics of rotary forging deformation and their mechanic analysis are briefly described; meanwhile the four kinds of defects caused generally in the deformation are introduced: chevron crack in thin workpiece, peripheral crack in the flange with a rod, instability and overlapping, and not thoroughly forging.

TL;DR: In this paper, the authors present the principles and applications of the latest BHF and BHP control schemes, especially those using multiple-point pressure application techniques, developed around the world.

TL;DR: In this article, Taguchi methods and statistical techniques are used to formulate the experimental layout, analyze the effect of each control factor on the results, and to predict the optimum setting for each control factors.

TL;DR: The theory of similarity is a very helpful instrument for transfering measuring data from a model to the real process and for setting up empirical process equations as mentioned in this paper, and some examples from physics and metal forming demonstrate the use of this theory.

TL;DR: In this article, the microstructure and cracks arising in pure iron, 0.15C and 0.5C steels when subjected to the same machining conditions were examined.

TL;DR: In this paper, a comparison is made of the various manufacturing methods and some economical aspects regarding the process costs are discussed for some parts, and some parts are compared for different manufacturing methods.

TL;DR: In this article, a need based design approach is suggested for achieving quality explosive welding, and the results of various experimental optimisation studies and experiments including those of the authors are compared with the results obtained through the suggested technique and are found to be in good agreement.

TL;DR: A computerized process-planning tool for sheet-metal parts, a bending-sequence generator has been developed that can be developed into the plane part automatically, technological data and know-how about the bending process and the press brake being included in this tool.