Patent ID: 8969754
Filing Date: 2015-03-03
Classification: B05B,B24D,C23C,E21B

Abstract:
1. A method for depositing hardfacing material on portions of a drill bit comprising: providing a vertically oriented plasma transfer arc torch secured to a positioner having controllable movement in a substantially vertical plane; securing a rolling cutter to a chuck mounted on an articulated arm of a robot; positioning a surface of a tooth of the rolling cutter in a substantially perpendicular relationship beneath the torch; providing a target path forminga first waveform about a centerline of a tooth surface to be hardfaced, the target path having tooth traversing portions substantially parallel to a crest portion of the tooth, the target path having a step path interconnecting two traversing portions, the step path being substantially parallel to an edge of the tooth; and oscillating the torch along a substantially horizontal axis; moving the rolling cutter with the articulated arm of the robot in a plane beneath the oscillating torch such that a midpoint of the torch oscillation substantially follows the target path; and depositing a hardfacing material on the tooth of the rolling cutter.