Showing papers by "Taylan Altan published in 1992"

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: 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 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, finite element (FE) based numerical modeling and physical modelling with plasticine are presented as process design tools in cold forging of bevel gears, and the results from the process simulation are then used as load input data for a punch stress analysis.

TL;DR: In this paper, the authors present results of an analysis of a seven pass square-to-round sequence using a computationally effective quasi-three dimensional finite-slab element code.

TL;DR: In this paper, a system for computer control of the variable blank-holder force (BHF) was implemented for a deep-drawing process, using a multi-action, computer-controlled press.

TL;DR: A computer-aided design system for designing parts for cold forging and establishing the associated process sequence and a finite-element method (FEM) based computer program, used for metal-flow simulation are developed.

TL;DR: In this paper, an automated remeshing procedure was developed to improve the efficiency of applying FEM to investigate tube extrusion, and the FEM mesh was automatically updated and used to simulate metal flow under three different extrusion conditions.

TL;DR: In this paper, an empirical method was developed to correct isothermal flow stress data and account for temperature history effects in non-isothermal forging processes, which is essentially an iterative procedure that uses an FEM code, such as alpid/deform, and results of nonisothermal forge trials to adjust the isothermal stress data.

TL;DR: A review of the recent developments in cold forming tooling, machines and processing can be found in this article, where the primary focus is on forming complex parts which often require a combination of forward, backward and radial extrusion, using novel multi-action tooling and forming equipment.

TL;DR: In this paper, a computer aided design and flow simulation procedure for predicting geometric defects and reducing them by the modification, of the die geometry including entry angles and the die land is presented.