Title: Development of hot forged drill bits of low alloy steel for petroliferous applications

Authors: Diego Rodolfo Simoes De Lima, Charles Chemale Yurgel, Eduardo Andre Hentz, Lirio Schaeffer

Addresses: Laboratorio de Transformacao Mecanica – LdTM/UFRGS, Universidade Federal do Rio Grande do Sul, Porto Alegre – RS, Brazil. ' Department of Mechanical Forming, SENAI – CIMATEC, Salvador – BA, Brazil. ' Laboratorio de Transformacao Mecanica – LdTM/UFRGS, Universidade Federal do Rio Grande do Sul, Porto Alegre – RS, Brazil. ' Laboratorio de Transformacao Mecanica – LdTM/UFRGS, Universidade Federal do Rio Grande do Sul, Porto Alegre – RS, Brazil

Abstract: This work aims at showing the feasibility of partial substitution of the machining process by hot forging, to obtain AISI 8640 steel drills bits, used to bore holes in rocks. This paper presents the tooling to obtain the piece, together with the procedure used for testing, comparing the force found in practice to computer simulation. It was found that the process proposed saved 3.5% of materials, and presented a 13% increase in piece hardness in the quenched and tempered state, compared to the piece produced conventionally.

Keywords: hot forging; AISI 8640; forged drill bit; numerical simulation; finite element method; FEM; low alloy steel; petroliferous applications; hole boring; rock drilling; hardness.

DOI: 10.1504/IJMMS.2008.020512

International Journal of Mechatronics and Manufacturing Systems, 2008 Vol.1 No.2/3, pp.282 - 294

Published online: 28 Sep 2008 *

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