Advanced search
Start date
Betweenand


Untitle in english

Full text
Author(s):
Melchor Rodríguez Madrigal
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Escola Politécnica (EP/BC)
Defense date:
Examining board members:
Joao Batista de Aguiar; Oscar Brito Augusto; Edson Gomes
Advisor: Joao Batista de Aguiar
Abstract

In this work, the finite elemento method was used to model orthogonal metal cutting. A coupled modelo f the termo-elastic-plastic material under large deformation for the metal cutting was constructed. The update Langrangian formulation of plane strain condition is used in this study. Emphasis was given on analyzing the effect of important factors, such as plastic flow of the workpiece material, strain, strain rate, work hardening and temperature. The flow stress is taken as a function of strain, strain rate, work hardening and temperature in order to reflect realistic behavior of the metal cutting. To simulate separation of the chip from the workpiece, superposition of two nodes at each nodal location of a parting line of the initial mesh was imposed. According to the developed algorithm, the superimposed nodes were constrained to assume identical displacement, until approaching to a specified small distance from the tool tip. At that juncture, the displacement constrained was removed and the separation of the nodes was allowed. The temperature field in the workpiece and chip was obtained by finite element simulation, and has been compared with temperature obtained in other Works. The calculated tempertature field agree quite well with the Stevensons model. Finally the effective stress and effective strain in the primary deformation zone and tool forces for the orthogonal metal cutting with rake angle zero were calculated. This results agree well with the Lins model. (AU)