Extrusion.- Study of Flow Through Conical Converging Dies.- Selection of Operating Parameters to Prevent Central Bursting Defects During Cold Extrusion.- The Effect of Material Properties on Tension Zone and Boundary Shear-Stress in Extrusion.- Application of Visioplasticity Techniques to Axisymmetric Extrusions.- The Extrusion of Rate Sensitive Materials.- Deformation Criteria for Predicting the Cold-Extrusion Pressures of Metals.- Drawing and Sheet Metal Forming.- The Effect of Homogeneity on the Formability of 7000 Series Aluminum Alloys for Cartridge Cases.- Effect of Plastic Anisotropy on Drawing Characteristics of Aluminum Alloy Sheet.- Analyses of Deformation and Texture as Functions of Fabrication in Mandrel-Drawn Tubing.- Experimental Evaluation of Theoretically Ideal Drawing Dies.- The Application of the Avitzur Upper Bound Equation to Tungsten Wire Drawing and Its Use in Die-Line Design.- Forming Loads and Friction.- Computer Simulation to Predict Load, Stress, and Metal Flow in an Axisymmetric Closed-Die Forging.- The Validity of Simulating Tests in Evaluating Lubricants for Deformation Processes.- A New Method for the Determination of Material Flow Stress Values under Metalworking Conditions.- Force Requirements and Friction in Warm Working Operations.- Workability.- Theories and Experiments on Friction, Deformation, and Fracture in Plastic Deformation Processes.- The Use of Workability Test Results to Predict Processing Limits.- Hot Workability Testing Techniques.- Simulation of Extrusion Structures by Means of Torsion Testing for a High Strength Nickel-Base Alloy, Udimet 700.- Prediction and Effects of Material Damage During Deformation Processing.- The Relationship Between Superplasticity and Formability.
On October 21 and 22, 1970, the Shaping and Forming Committee, Institute of Metals Division, The Metallurgical Society of AlME, held a Conference on "The Relation Between Theory and Practice it). Metal Forming" at the Sheraton-Cleveland Hotel during the Fall Meeting of AIME in Cleveland, Ohio. This conference was devoted to recent applications of theory to metal forming to establish a milestone in the current ability to predict phenomena during deformation processing and, thereby, demonstrate the utility of theory for process design. The papers were selected by first requesting presentations of relevant recent work from 68 recognized authorities in metal forming which resulted in 17 papers. A sub sequent call for papers resulted in the submission of 19 abstracts from which 4 papers were selected. The selection criteria required that the paper coupled theory with practice, and that the work was recent, unpublished and worthy of permanent record. The selection was performed by the Conference Chairman. The papers in this volume have been organized in accordance with the following subjects: Extrusion Drawing and Sheet Metal Forming Forming Loads and Friction Workability These papers appear to assess the salient recent applications of mechanics to the deformation processing of alloys at the present time, i. e. , circa 1970, A, L. Hoffmanner Conference Chairman May, 1970 vii LIST OF CONTRIBUTORS Taylan Altan, Metalworking Division, Columbus Laboratories, Battelle Memorial Institute, Columbus, Ohio W. A.
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