Fracturing and Deformation Characteristics of Aluminium Preform during Cold Forging at Low Strain Rates
The industrial processing of sintered powder preform has been developed for manufacturing various engineering components. The present investigation has been undertaken to analyze the deformation characteristics during the cold forging of sintered aluminium preform at low strain rates. Experiments have been conducted and measurements made on deformation during cold forging on aluminium preforms with lubricated end conditions. Experimentally obtained flow load and plastic work done are in good agreement with theoretical estimates.
An investigation on the workability of sintered copper-silicon carbide preforms during cold axial upsetting
An investigation has been carried out for the determination of the workability behaviour of Cu-SiC composites under two different stress conditions namely plane and tri-axial state. Cylindrical preforms with 95% initial preform density possessing aspect ratio of 0.60 are prepared from copper with various percent content of silicon carbide (up to 20%) metal matrix composites using a die and punch assembly with a 1.0 MN capacity Universal Testing Machine. The sintering operation is carried out in an electric furnace at 850 ± 10°C for a period of one hour in argon inert atmosphere and subsequently they are furnace cooled. Each sintered preform is subjected to an incremental compressive loading under zinc stearate as lubricant. Based on the experimental results, the phenomenon like axial strain (εz), various stress ratio parameters (namely (σm/σeff) and (σθ/σeff)) and the formability stress index (β) under two different stress state conditions are systematically analysed considering the barreling effects.
Formability Characteristics of Aluminium Based Composites-A Review
In this review, the formability characteristics of Aluminium based composites using FEM and statistical tool are discussed. Formability characteristics of Metal Matrix Composites (MMCs) have been influenced by many factors viz., temperature, pressure, volume fraction of reinforcement, size and shape of particles. Investigation on wall friction, friction between particles and matrix powder are also presented. Detailed review has been carried out on the workability studies on upsetting of MMCs and forming limit diagrams. The state of the art has been discussed with the help of literatures.