Drill stem thickening process and thickening module

Abstract

The invention relates to a drill stem thickening process and a thickening module. The thickening module comprises a thickening module 1 and a punching module 2. a third time thickening module is a final forming module, namely an inner thickening copying module, which comprises a clamping area 11, a transition belt 12, a thickening area 13, a transformation transition belt 14 and a starting area 15 which are orderly connected with the thickening area 13. The length of the transition belt of the thickening module is prolonged and the transition is performed in the manner of S-shaped smooth transition. The invention overcomes the shortcomings of the prior art that the shape of the transition belt in the drill stem is uneven, lathe work is required, the stress concentration is easily occurred, the service life of the drill stem is short, and the like. Compared with the prior art, the thickening transition belt in the drill stem can naturally smooth transit so the stress concentration in the deformation area and the probability of generating vortex caused by size change during usage are greatly decreased, the stress at the thickened tube joint part is reduced, the inner transition belt of the final products is unnecessary to form, the use life of the drill stem is prolonged and the drill stem quality is ensured.

Description

technical field [0001] The invention relates to an upsetting process for thickening the pipe end of a drill pipe, in particular to a drill pipe upsetting process in which the pipe end of the drill pipe is heated by an intermediate frequency heating furnace, and then the pipe end is upset and thickened by a thickening machine. Coarse thickening process and thickening mold. Background technique [0002] The production of drill pipe is to use the intermediate frequency heating furnace to heat the pipe end of the drill pipe, and then use the thickening machine to thicken the pipe end. During the thickening process, use the thickening mold to control the outer diameter and punch of the thickened part of the pipe end The mold controls the inner diameter of the thickened part of the pipe end to achieve the purpose of the drill pipe with both the inner and outer diameters of the pipe end conforming to the API 5D standard. The design principle of the existing drill pipe upsetting an...

AI Technical Summary

Problems solved by technology

The design principle of the existing drill pipe upsetting and thickening process is: after heating the pipe end of the drill pipe with an intermediate frequency heating furnace, the pipe end is thickened three times by a thickening machine, and the internal and external thickening is carried out at the same time each time. , the transition zone inside the pipe end of the drill pipe is completely free-formed, so the shape of the transition zone inside the pipe end of the drill pipe is uneven and discontinuous, and it needs to be processed by turning. The final shape of the transition zone inside is "Z" shape, and the length Short (80-100mm), prone to stress concentration, easy to generate eddy currents due to sudden changes in size during use, increasing damage to the pipe body, and shortening the service life of the drill pipe

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