By S. L. Semiatin
Quantity 14A is an integral reference for production, fabrics, and layout engineers. It offers entire insurance and crucial technical info at the process-design relationships which are had to decide upon and keep an eye on metalworking operations that produce shapes from forging, extrusion, drawing, and rolling operations. In-depth dialogue of forming gear, tactics, fabrics, and complicated modeling concepts make it a considerably new up-to-date ASM guide.
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Extra resources for Asm Handbook: Volume 14A: Metalworking : Bulk Forming (ASM Handbook)
Dislocation glide). , faster) growth is then assumed to occur for nuclei of particular misorientations with respect to the matrix. More detailed information on the modeling of the evolution of recrystallization and transformation textures can be found in the article “Transformation and Recrystallization Textures Associated with Steel Processing” in this Volume. (b) Normalized Grain Area (Average) 70 Case A 60 50 40 30 Case B 20 Case C 10 0 100 200 300 400 500 600 700 800 900 1000 Time, MCS (c) (d) Fig.
These machines can be classified into three types: load-restricted machines (hydraulic presses), stroke-restricted machines (crank and eccentric, or mechanical, presses), and energy-restricted machines (hammers and screw presses). The significant characteristics of pressing-type machines comprise all machine design and performance data that are pertinent to the economical use of the machine. These characteristics include: Characteristics for load and energy: Available load, available energy, and efficiency factor (which equals the energy available for workpiece deformation/energy supplied to the machine) Time-related characteristics: Number of strokes per minute, contact time under pressure, and velocity under pressure Characteristics for accuracy: For example, deflection of the ram and frame, particularly under off-center loading, and press stiffness Recent Developments in Bulk Forming Since the publication in 1988 of the previous edition of the ASM Handbook on Forming and Forging, metalworking practice has seen a number of notable advances with regard to the development of new processes; new materials, the increased control of microstructure via specialized thermomechanical processes, and the development of advanced tools for predicting microstructure and texture evolution; and the application of sophisticated process simulation and design tools.
L. Semiatin, Air Force Research Laboratory, Materials and Manufacturing Directorate METALWORKING consists of deformation processes in which a metal billet or blank is shaped by tools or dies. The design and control of such processes depend on the characteristics of the workpiece material, the conditions at the tool/workpiece interface, the mechanics of plastic deformation (metal flow), the equipment used, and the finished-product requirements. These factors influence the selection of tool geometry and material as well as processing conditions (for example, workpiece and die temperatures and lubrication).