Welding-free triangular arc protruding edge integral drill rod clamping device and machining method thereof

Abstract

The invention provides a welding-free triangular arc protruding edge integral drill rod clamping device and a machining method thereof. Three clamping oil cylinders are uniformly distributed within the whole circumference 360-degree range of the outer sides of half bodies of three clamping blocks, and thus clamping in the drill rod extruding process, installing before drill rod extruding and taking out after extrusion are achieved. By means of the split type outer die extruding technology, the two ends of a triangular arc protruding edge rod body are subjected to local upsetting, a drill rod inner thread connector and a drill rod outer thread connector are machined at the two upset ends of the rod body correspondingly, and thus the drill rod body and a drill rod connector form an integralstructure without welding connection. According to the clamping device and the machining method thereof, machining and manufacturing of the triangular arc protruding edge integral drill rod are achieved, and the overall strength and torsional performance of the triangular arc protruding edge drill rod are improved greatly. Meanwhile, the quality defect due to manual arc welding or friction weldingadopted in an inserted type triangular arc protruding edge drill rod and a friction welding type triangular arc protruding edge drill rod is avoided, and the progress of the triangular arc protrudingedge machining technology and development of the pit drilling cause in China are propelled.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a non-welded triangular arc convex ridge integrated drill pipe clamping device and a processing method thereof. Background technique [0002] At present, domestic triangular arc-convex drill pipes are widely used in major mining areas in China due to their strong gas emission capacity, low rotation resistance, and fast drilling speed. Since the cross-section of the triangular arc convex drill pipe body is a triangular pipe ring, the joint is a pipe thread with a taper, and the drill pipe has a special structure. In the past, the triangular arc convex drill pipe generally adopted a plug-in structure, that is, the joints at both ends Processed into steps, the big end of the step is consistent with the triangle shape of the drill pipe body, the small end of the step is consistent with the triangle shape of the drill pipe body, the small end is inserted into the triangl...

AI Technical Summary

Problems solved by technology

For a long time, the majority of technicians have been working hard on the structure and process of the drill pipe, and have spent a lot of effort in realizing the integrated drill pipe without welding triangular arc convex ribs. However, there has been no better breakthrough in the manufacturing process, which needs to be improved urgently.

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