Abstract
The article considers the stability of a drill rod of a machine for drilling of the blast furnace iron notch. A technique for determination of the critical effort for the drill-rod was developed, taking into account the applied torque, and the angular velocity of the instrument. The suggested approach is simple to use and provide reasonable accuracy in the calculation of the allowable pressure of the drill-rod from the side of the mechanism for moving the carriage of a machine. The article presents a graph of the critical effort for the drill-rod on the depth of penetration of drilling tools in the iron notch. Obtained dependences allow picking up the geometric characteristics of the drill-rod, holding the drill bit, at the design stage of modern machine for drilling of iron notch. The materials of the article can be used by design engineers of metallurgical equipment and students.
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