Method for rolling external tube thread, rolling head and rolling equipment thereof

Abstract

The invention provides a method for rolling an external tube thread, a rolling head and rolling equipment thereof. The method includes the steps that a rolling wheel conducts rolling from the thread tail of the thread, and screw thread rolling is completed towards the head portion of the thread. The rolling head comprises at least one rolling wheel which is arranged along the circumference, a corresponding rolling wheel shaft and a rolling wheel seat. The rolling wheel is rotatably fixed on the rolling wheel seat through the rolling wheel shaft, the rolling wheel is provided with a tube thread forming part, and the length of a thread of the tube thread forming part is smaller than the effective thread length of the rolled external tube thread. The rolling head further comprises a radial regulating device which can achieve dynamic rolling and regulate the radial position of the rolling wheel in real time in the whole process, so that the taper required by the rolling technology is formed. The invention further provides the rolling equipment including the rolling head. According to the scheme, the end of a steel tube cannot be deformed easily in the rolling process, hollow cylindrical blank materials are saved obviously, and the rate of finished products is improved.

Description

[0001] This application claims the priority of the earlier application with application number CN201310110406.0 submitted on March 31, 2013. technical field [0002] The invention generally relates to the fields of pipeline products and pipeline processing machinery, and in particular to a method for rolling external threads of pipes, a rolling head and equipment thereof. Background technique [0003] Due to the advantages of high mechanical connection strength and good sealing performance of the pipe thread compared with the cutting pipe external thread, more and more people pay attention to it. The corresponding manufacturing process is listed in the national invention patent "CN200310111695.2" and The invention patent "CN200710106912.7" is also disclosed. However, the two rolling pipe external thread processing methods disclosed in the above two invention patents both perform axial stamping or radial extrusion of the conical surface first and then roll the external pipe t...

AI Technical Summary

Problems solved by technology

[0006] 2. Due to the huge axial instantaneous stamping or radial extrusion pressure, when the conical surface is formed, the material of the pipe body at the junction of the original outer diameter of the steel pipe and the conical surface, especially the weld seam of the welded pipe, is susceptible to hidden and obvious damage. Sexual damage, resulting in safety hazards for external pipe thread products

[0007] 3. Since the outer diameter of the existing rolling steel pipe blank is the outer diameter of the steel pipe determined by the cutting process, the outer diameter is too large for rolling

However, there are no national and international standards for the outer diameter and wall thickness of rolled steel pipes, and it will take a certain amount of time for market promotion and acceptance, which will inevitably affect the promotion and application of the rolled pipe external thread process.

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