Mg , Si and die geometry effects on the formability and the machinability of recycled aluminium alloys
Mg, Si and die geometry effects on the formability and machinability were experimentally reported, concerning AA6xxx aluminium alloys which were produced by recycling raw material. The aluminium alloys formability characteristics were evaluated during extrusion and open die forging tests estimating the needed load; the machinability characteristics of the same aluminium alloys were conducted via cutting force measurements during simple turning process. Key-Words: formability, machinability, Mg ratio, Si ratio, extrusion test, cutting, recycling
Simulation of the precision forging of bevel gears using implicit and explicit FE techniques
Abstract The implicit FE code MARC has been used to simulate the precision forging of a bevel gear. The true coupled thermomechanical forming conditions have been adopted to describe the metal flow during the process and the results obtained have been validated by extensive experimental work. An attempt has been made also to use a time-consuming explicit FE code, DYNA 3D; however, limitations were apparent in simulating the total procedure due to structural restrictions of this code. A CAD/CAM/CAE system able to successfully analyse such a precision forging operation is on hand.
Some aspects of the development of cold forging to a high-tech precision technology
Abstract Although developed since 1935, the advantages of the cold-forging technology with emphasis on steel as component material have not yet been used to its full potential on a broad scale by industry. However, a significant standard in complexity of geometry end precision combined with excellent part performance has been achieved in a few industrialized countries by a few progressive companies since about 1960. This paper describes the complex structure of the cold-forging process with a variety of interfaces between material, tribology, tool, machine tool and automation, etc., under the aspect of the requirements for precision cold forging. Among other items the FEM- and BEM-methods are presented as powerful tools for the optimization of product and tool.